HOOK COUPLING STRUCTURE AND BATTERY PACK CASE USING SAME

Abstract

Discussed is a hook coupling structure and a battery pack case using the hook coupling structure, and the hook coupling structure includes an upper structure body comprising a hook part that extends downward from an edge thereof and has an end portion bent to an inside thereof; and a lower structure body comprising a protrusion part and coupled to the upper structure body, the protrusion part being lifted upward from an edge thereof and disposed inside the hook part, wherein the lower structure body further comprises a locking projection that is formed, at a position corresponding to an upper portion of the hook part of the upper structure body, by protruding an inner surface of the lower structure body outward, and wherein the hook part is inserted between the locking projection and the protrusion part to establish a coupling.

Claims

1. A hook coupling structure comprising: an upper structure body comprising a hook part that extends downward from an edge thereof and has an end portion bent to an inside thereof; and a lower structure body comprising a protrusion part and coupled to the upper structure body, the protrusion part being lifted upward from an edge thereof and disposed inside the hook part, wherein the lower structure body further comprises a locking projection that is formed, at a position corresponding to an upper portion of the hook part of the upper structure body, by protruding an inner surface of the lower structure body outward, and wherein the hook part is inserted between the locking projection and the protrusion part to establish a coupling.

2. The hook coupling structure of claim 1, wherein the hook part comprises: a first bent surface that is a surface formed through bending and is in contact with the protrusion part of the lower structure body; and a second bent surface that is a surface formed through bending and is in contact with the locking projection.

3. The hook coupling structure of claim 2, wherein the first bent surface of the hook part has a thickness greater than or equal to that of the protrusion part.

4. The hook coupling structure of claim 2, wherein the second bent surface of the hook part has a thickness less than that of the locking projection.

5. The hook coupling structure of claim 1, wherein an insertion-coupling ridge is defined between the locking projection and the protrusion part of the lower structure body so that a bent portion of the hook part is positioned therein.

6. A battery pack case comprising: a battery pack lower case having an insertion-coupling ridge defined in a predetermined area of an edge thereof; and a battery pack upper case comprising a hook part that has an end portion bent at a position corresponding to the insertion-coupling ridge of the battery pack lower case, wherein the insertion-coupling ridge of the battery pack lower case and the hook part of the battery pack upper case are coupled to each other to establish a hook coupling structure.

7. The battery pack case of claim 6, wherein the battery pack lower case further comprises: a locking projection positioned at a height to be in contact with an upper surface of the hook part and disposed on a plane adjacent to a plane in which the hook part is disposed, the locking projection protruding outward so that the hook part of the battery pack upper case is locked therein; and a protrusion part positioned at a height to be in contact with a lower surface of the hook part and disposed on a plane identical to the plane in which the hook part is disposed, the protrusion part being lifted upward to support the hook part.

8. The battery pack case of claim 7, wherein the hook part of the battery pack upper case comprises: a first bent surface that is a surface formed through bending and is in contact with the protrusion part of the battery pack lower case; and a second bent surface that is a surface formed through bending and is in contact with the locking projection.

9. The battery pack case of claim 7, wherein an insertion-coupling ridge is defined between the locking projection and the protrusion part of the battery pack lower case so that the hook part is positioned therein.

10. A device comprising the battery pack case of claim 6.

11. A hook coupling structure comprising: an upper structure body comprising a hook part that extends from an upper surface thereof and has a protruding end portion; and a lower structure body comprising a through-hole and a locking projection, the through-hole formed by punching a predetermined area of a bottom surface so that a predetermined area of the hook part is disposed inside the bottom surface, the locking projection being formed, at a position corresponding to an upper portion of the hook part of the upper structure body, by protruding an inner surface of the lower structure body outward, wherein, the predetermined area of the hook part is inserted into the through-hole to establish a coupling.

12. The hook coupling structure of claim 11, wherein the bottom surface of the lower structure body comprises: a first bottom part positioned on one side of the through-hole; and a second bottom part positioned on the other side of the through-hole, wherein, among the first bottom part and the second bottom part, the bottom part in an area, in which the locking projection is not positioned, supports a predetermined area on a non-protruding side of the hook part.

13. The hook coupling structure of claim 11, wherein an insertion-coupling ridge is defined between the locking projection of the lower structure body and the through-hole of the bottom surface so that the hook part is positioned to an inside thereof.

14. The hook coupling structure of claim 11, wherein the hook part of the upper structure body has a thickness greater than that of an extension portion from the upper structure body.

15. The hook coupling structure of claim 11, wherein the punched through-hole has a size greater than or equal to a thickness of the hook part.

16. A battery pack case comprising: a battery pack lower case having an insertion-coupling ridge defined in a predetermined area on a bottom surface; and a battery pack upper case comprising a hook part with a bent portion in which an end portion protrudes at a position corresponding to the insertion-coupling ridge of the battery pack lower case, wherein the insertion-coupling ridge of the battery pack lower case and the hook part of the battery pack upper case are coupled to each other to establish a hook coupling structure.

17. The battery pack case of claim 16, wherein the battery pack lower case comprises: a through-hole formed by punching a predetermined area on a bottom surface of the battery pack lower case so that a predetermined area of the bent portion of the battery pack upper case is disposed to an inside thereof; and a locking projection positioned, while spaced a predetermined height from the through-hole, in a predetermined area that is on a side surface of the battery pack lower case and corresponds to the hook part of the battery pack upper case, wherein the bent portion of the battery pack upper case is locked in the locking projection.

18. The battery pack case of claim 17, wherein the battery pack lower case further comprises: a side wall part positioned on one side of the through-hole; and a bottom part positioned on the other side of the through-hole, wherein the bottom part supports a predetermined area on a non-protruding side of the bent portion of the hook part.

19. The battery pack case of claim 17, wherein an insertion-coupling ridge is defined between the locking projection and the bottom surface so that the bent portion of the hook part is positioned between the locking projection and the through-hole of the bottom surface.

20. A device comprising the battery pack case of claim 16.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG. 1 is a side view of a hook coupling structure in accordance with the related art.

[0047] FIG. 2 is a side view of another hook coupling structure obtained by improving the hook coupling structure in accordance with the related art.

[0048] FIG. 3 is a side view of a hook coupling structure in accordance with an embodiment of the present invention.

[0049] FIG. 4 is an enlarged side view of a hook part in accordance with the embodiment of the present invention.

[0050] FIG. 5 is a side view of the hook coupling structure before a hook part in accordance with the embodiment of the present invention is inserted.

[0051] FIG. 6 is a view of an inner structure of a battery pack case in accordance with an embodiment of the present invention.

[0052] (a) of FIG. 7 is a cross-sectional view taken along line A-A′ in an area with a hook coupling structure within the battery pack case in accordance with the embodiment of the present invention.

[0053] (b) of FIG. 7 is a cross-sectional view taken along line B-B′ in an area without a hook coupling structure within the battery pack case in accordance with the embodiment of the present invention.

[0054] FIG. 8 is a side view of the hook coupling structure in the battery pack case in accordance with the embodiment of the present invention.

[0055] FIG. 9 is a side view of the hook coupling structure before a hook part in the battery pack case in accordance with the embodiment of the present invention is inserted.

[0056] FIG. 10 is an enlarged side view of the hook part in the battery pack case in accordance with the embodiment of the present invention.

[0057] FIG. 11 is a side view of a hook coupling structure in accordance with another embodiment of the present invention.

[0058] FIG. 12 is a side view of the hook coupling structure before a hook part in accordance with another embodiment of the present invention is inserted.

[0059] FIG. 13 is a view of an inner structure of a battery pack case in accordance with another embodiment of the present invention.

[0060] FIG. 14 is a cut side view of a hook coupling structure in the battery pack case in accordance with another embodiment of the present invention.

[0061] FIG. 15 is a cut side view of the hook coupling structure in the battery pack case before a hook part in accordance with another embodiment of the present invention is inserted.

MODE FOR CARRYING OUT THE INVENTION

[0062] Hereinafter, embodiments of the present invention will be described in detail with reference to the illustrations in the accompanying drawings. However, the present invention is not limited or restricted to the embodiments. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0063] Although the ordinal numbers such as first and second are used herein to describe various elements, these elements should not be limited by these numbers. The terms are only used to distinguish one component from other components. For example, a first element can be referred to as a second element, and similarly a second element can be referred to as a first element without departing from the scope of the present invention. The terms herein are used only for explaining a specific embodiment while not intended to limit the present invention. The expression of a singular form includes plural forms unless definitely indicating a particular case in terms of the context.

[0064] The terms used in the present invention are selected as general terms currently and widely used in consideration of functions of the present invention, but the terms may vary in accordance with the intention of those skilled in the art, precedents, or new technology in the art. Also, specific terms may be temporarily selected by the applicant, and in this case, the detailed meaning thereof will be described in the detailed description of the invention. Thus, the terms used in the present invention should be defined not as simple terms but based on the meaning of the terms and the overall description of the invention.

Embodiment 1

[0065] Next, a hook coupling structure in accordance with an embodiment of the present invention will be described.

[0066] In the hook coupling structure in accordance with the embodiment of the present invention, a protrusion is formed by lifting an edge of a lower structure body in which the hook coupling structure is provided, and a hook part is supported by the protrusion so that the hook part is not moved back after locked in a locking projection. Therefore, a space utilization rate of the hook coupling structure may increase.

[0067] FIG. 3 is a side view of the hook coupling structure in accordance with the embodiment of the present invention.

[0068] Referring to FIG. 3, a hook coupling structure 100 in accordance with the embodiment of the present invention includes an upper structure body 110 that includes a hook part 111 that extends downward from an edge and has an end portion bent to the inside, a lower structure body 120 that includes a protrusion part 121 lifted upward from an edge and disposed inside the hook part 111, and a locking projection 130 in which the hook part 111 of the upper structure body 110 is locked.

[0069] Also, the hook part is inserted between the locking projection 130 and the protrusion part 121 to establish a coupling.

[0070] A configuration of the hook coupling structure will be described below in more detail.

[0071] First, the upper structure body 110 includes the hook part 111 that extends downward from the edge and has the end portion bent to the inside, and is made of a material elastically deformable by a predetermined amount so as to be easily inserted between the locking projection 130 and the protrusion part 121.

[0072] The hook part 111 will be described in detail with reference to FIG. 4.

[0073] FIG. 4 is an enlarged side view of the hook part in accordance with the embodiment of the present invention.

[0074] Referring to FIG. 4, the hook part 111 includes a first bent surface 111_1 that is a surface formed through bending and is in contact with the protrusion part 121 of the lower structure body and a second bent surface 111_2 that is a surface formed through bending and is in contact with the locking projection 130.

[0075] Describing in more detail, the first bent surface 111_1 is a surface formed by bending once the edge of the upper structure body 110. For one example, the first bent surface 111_1 has a thickness equal to or greater by a predetermined range than that of an upper surface of the protrusion part 121.

[0076] When the thickness of the first bent surface 111_1 is less than that of the upper surface of the protrusion part 121, the end portion of the hook part 111 may not be sufficiently locked in the protrusion part 121. Also, when the thickness of the first bent surface 1111 is excessively greater by the predetermined range than that of the upper surface of the protrusion part 121, a tight coupling is not established due to a gap between the end portion of the hook part 111 and the protrusion part 121 after the hook coupling. Thus, the first bent surface is provided having an appropriately large thickness.

[0077] Also, the second bent surface 111_2 is a surface that is formed by bending once again after the first bent surface 111_1 is formed by bending once. For one example, the second bent surface 111_2 has a thickness equal to that of a lower surface of the locking projection 130. When the thickness of the second bent surface 111_2 is less than that of the lower surface of the locking projection 130, the end portion of the hook part 111 may be separated from the locking projection after the hook coupling due to an impact on an assembly structure. Also, when the thickness of the second bent surface 111_2 is greater than that of the lower surface of the locking projection 130, the entire thickness of the hook coupling structure may increase.

[0078] Also, the end portion of the hook part 111 has one side having a parallel shape and the other side having a shape gradually narrowed downward, and thus may be easily inserted between the locking projection 130 and the protrusion part 121. The one side of the end portion of the hook part 111 has the parallel shape so that a force to be supported by the protrusion part 121 is not dispersed, but the shape of the one side is not limited thereto.

[0079] Also, the lower structure body 120 includes the protrusion part 121 that is lifted upward from the edge and disposed inside the hook part 111, and a height of the lifted protrusion part 121 is equal to a length of the end portion of the hook part 111 or greater than that of the end portion of the hook part. When the height of the lifted protrusion part 121 is less than the length of the end portion of the hook part 111, a supporting force of the hook part 111 is weak, and the coupling may not be maintained.

[0080] When comparing structures of the protrusion part 121 and the hook part 111 with those in accordance with the related art, the hook coupling structure in accordance with the related art as illustrated in FIG. 2 includes the first structure 30 that is disposed as the lower component and the second structure 40 that is disposed above the first structure 30 and has the shape corresponding to the first structure 30.

[0081] In the first structure 30, the locking projection 31 protrudes outward from the predetermined area inside the side wall part, and the support 32 extends upward from the first structure 30 and is spaced the predetermined interval from the locking projection 31.

[0082] Also, in the second structure 40, the hook part 41 includes the body 41_1 that is disposed between the locking projection 31 and the support 32 and extends downward from the second structure 40 and the protrusion part 41_2 that extends from the body 41_1 and protrudes toward the locking projection 31.

[0083] However, as a space-saving is required in the above-described hook coupling structure in accordance with the related art, the support 32 is removed from the hook coupling structure in accordance with the related art so as to improve the space efficiency, and the hook part 111 bent twice and the protrusion part 121 for supporting the hook part 111 are provided as in the present application. As a result, the space utilization of the hook coupling structure increases.

[0084] Also, the locking projection 130 is formed, at a position corresponding to an upper portion of the hook part 111 of the upper structure body 110, by protruding an inner surface of the lower structure body outward. The hook part 111 of the upper structure body 110 is locked in the locking projection 130.

[0085] Also, an insertion-coupling ridge 140 is defined between the locking projection 130 and the protrusion part 121 so that the hook part 111 is positioned therein, which will be described in detail with reference to FIG. 5.

[0086] FIG. 5 is a side view of the hook coupling structure before the hook part in accordance with the embodiment of the present invention is inserted.

[0087] Referring to FIG. 5, a length of the insertion-coupling ridge 140 from a left corner to a right corner that is in contact with an upper surface of the protrusion part 121 is equal to a length from the first bent surface 111_1 to the second bent surface 111_2. Therefore, the hook part 111 may be easily inserted into the insertion-coupling ridge 140.

[0088] Also, the hook coupling structure in accordance with the embodiment of the present invention is applied to various structure bodies of a case in which hook structure bodies are coupled to each other to create a predetermined space, thereby achieving a further improvement in space efficiency for the structure body when compared to the related art.

Embodiment 2

[0089] Next, a battery pack case in accordance with an embodiment of the present invention will be described.

[0090] The battery pack case in accordance with the embodiment of the present invention is a battery pack case including the hook coupling structure in accordance with the above-described embodiment. A hook part provided in a battery pack upper case is bent twice to define a predetermined space, and a protrusion lifted from an edge of a battery pack lower case is disposed inside the predetermined space of the hook part. As a result, the hook part may be supported without being moved back.

[0091] FIG. 6 is a view of an inner structure of the battery pack case in accordance with the embodiment of the present invention. Here, FIG. 6 is a view in which a portion of an upper surface is cut to show the inside where a hook coupling structure is provided, but a structure of a battery pack upper case is typically provided in a shape in which the upper surface is fully covered.

[0092] (a) of FIG. 7 is a cross-sectional view taken along line A-A′ in an area with the hook coupling structure within the battery pack case in accordance with the embodiment of the present invention, and (b) of FIG. 7 is a cross-sectional view taken along line B-B′ in an area without the hook coupling structure within the battery pack case in accordance with the embodiment of the present invention.

[0093] FIG. 8 is a side view of the hook coupling structure in the battery pack case in accordance with the embodiment of the present invention.

[0094] Referring to FIGS. 6 to 8, the battery pack case in accordance with the embodiment of the present invention includes a battery pack lower case 300 having an insertion-coupling ridge defined in a predetermined area of an edge and a battery pack upper case 200 including a hook part 210 that has an end portion bent at a position corresponding to the insertion-coupling ridge of the battery pack lower case.

[0095] Also, the insertion-coupling ridge of the lower case and the hook part of the upper case are coupled to each other to establish the hook coupling structure. Also, a plurality of hook coupling structures may be provided at corners to increase a coupling force between the upper case and the lower case, or a coupling structure may be provided over the entire edges of the case.

[0096] Describing in more detain with reference to FIGS. 6 and 7, the hook coupling structure is provided at each of the corners of the battery pack upper case 200, and the hook coupling structure is provided at each of both sides as illustrated in the cross-sectional area taken along line A-A′. In the hook coupling structure, the hook part 210 extends from the battery pack upper case 200 over a predetermined range and is coupled to the battery pack lower case 300. Unlike the above-described structure, in an area taken along line B-B′ in which the hook coupling structure is not provided, the battery pack upper case 200 has a height less by a predetermined range than a height in the area of line A-A′. This structure with the hook coupling structure and without the hook coupling structure may have a protrusion and recess shape to improve a coupling force for the structure itself.

[0097] A configuration of the battery pack case will be described below in more detail.

[0098] The lower case 300 has an insertion-coupling ridge 330 defined in a predetermined area of an edge, and will be described in detail with reference to FIG. 9.

[0099] FIG. 9 is a side view of the hook coupling structure before the hook part in the battery pack case in accordance with the embodiment of the present invention is inserted.

[0100] Referring to FIG. 9, in the battery pack lower case 300, the insertion-coupling ridge 330 is defined between the locking projection and a protrusion part of the battery pack lower case so that the hook part is positioned therein. A length of the insertion-coupling ridge 330 from a left corner to a right corner that is in contact with an upper surface of a protrusion part 320 is equal to a length from a first bent surface 211 to a second bent surface 212. Therefore, the hook part 210 may be easily inserted into the insertion-coupling ridge 330.

[0101] Also, the battery pack lower case 300 includes a locking projection 310 positioned at a height to be in contact with an upper surface of the hook part and disposed on a plane adjacent to a plane in which the hook part is disposed, the locking projection protruding outward so that the hook part of the battery pack upper case is locked therein, and the protrusion part 320 positioned at a height to be in contact with a lower surface of the hook part and disposed on a plane identical to a plane in which the hook part is disposed, the protrusion part being lifted upward to support the hook part.

[0102] Also, the locking projection 310 is formed, at a position corresponding to an upper portion of the hook part 111 of the upper structure body 110, by protruding an inner surface of the lower structure body outward. The hook part 111 of the upper structure body 110 is locked in the locking projection 130.

[0103] Also, the lower structure body 300 includes the protrusion part 320 that is lifted upward from the edge and disposed inside the hook part 211, and a height of the lifted protrusion part 320 is equal to a length of the end portion of the hook part 210 or greater than that of the end portion of the hook part. When the height of the lifted protrusion part 320 is less than the length of the end portion of the hook part 210, a supporting force of the hook part 210 is weak, and the coupling may not be maintained.

[0104] When comparing structures of the protrusion part 320 and the hook part 210 with those in accordance with the related art, the hook coupling structure in accordance with the related art as illustrated in FIG. 2 includes the first structure 30 that is disposed as the lower component and the second structure 40 that is disposed above the first structure 30 and has the shape corresponding to the first structure 30.

[0105] In the first structure 30, the locking projection 31 protrudes outward from the predetermined area inside the side wall part, and the support 32 extends upward from the first structure 30 and is spaced the predetermined interval from the locking projection 31.

[0106] Also, in the second structure 40, the hook part 41 includes the body 41_1 that is disposed between the locking projection 31 and the support 32 and extends downward from the second structure 40 and the protrusion part 41_2 that extends from the body 41_1 and protrudes toward the locking projection 31.

[0107] However, as a space-saving is required in the above-described hook coupling structure in accordance with the related art, the support 32 is removed from the hook coupling structure in accordance with the related art so as to improve the space efficiency, and the hook part 211 bent twice and the protrusion part 320 for supporting the hook part 211 are provided as in the present application. As a result, the space utilization of the hook coupling structure increases.

[0108] Also, the battery pack upper case 200 includes the hook part 210 that has an end portion bent at a position corresponding to the insertion-coupling ridge of the battery pack lower case. Here, the hook part 210 is made of a material elastically deformable by a predetermined amount so as to be easily inserted between the locking projection 310 and the protrusion part 320.

[0109] The hook part 210 includes the first bent surface 211 that is a surface formed through bending and is in contact with the protrusion part 320 of the lower structure body and the second bent surface 212 that is a surface formed through bending and is in contact with the locking projection 310, and will be described in more detail with reference to FIG. 9.

[0110] FIG. 10 is an enlarged side view of the hook part in the battery pack case in accordance with the embodiment of the present invention.

[0111] Referring to FIG. 10, the first bent surface 211 is a surface formed by bending once the edge of the upper case 200. For one example, the first bent surface 211 has a thickness equal to or greater by a predetermined range than that of an upper surface of the protrusion part 320.

[0112] When the thickness of the first bent surface 211 is less than that of the upper surface of the protrusion part 320, the end portion of the hook part 210 may not be sufficiently locked in the protrusion part 320. Also, when the thickness of the first bent surface 211 is excessively greater by the predetermined range than that of the upper surface of the protrusion part 320, a tight coupling is not established due to a gap between the end portion of the hook part 210 and the protrusion part 320 after the hook coupling. Thus, the first bent surface is provided having an appropriately large thickness.

[0113] Also, the second bent surface 212 is a surface that is formed by bending once again after the first bent surface 211 is formed by bending once. For one example, the second bent surface 212 has a thickness equal to that of a lower surface of the locking projection 310. When the thickness of the second bent surface 212 is less by a predetermined range than that of the lower surface of the locking projection 310, the end portion of the hook part 210 may be separated from the locking projection after the hook coupling due to an impact on an assembly structure. Also, when the thickness of the second bent surface 212 is greater than that of the lower surface of the locking projection 310, the entire thickness of the hook coupling structure may increase.

[0114] Also, the end portion of the hook part 210 has one side having a parallel shape and the other side having a shape gradually narrowed downward, and thus may be easily inserted between the locking projection 310 and the protrusion part 320. The one side of the end portion of the hook part 210 has the parallel shape so that a force to be supported by the protrusion part 320 is not dispersed, but the shape of the one side is not limited thereto.

[0115] Also, the battery pack case in accordance with the embodiment of the present invention increases in space utilization, and thus may have a smaller battery pack case size or be equipped with more battery cells to achieve an enhanced capacity, when compared to the related art. As a result, a device including the above-described battery pack case may have a smaller size than the related art or a further increased capacity than the related art.

Embodiment 3

[0116] Next, a hook coupling structure in accordance with another embodiment of the present invention will be described.

[0117] In the hook coupling structure in accordance with another embodiment of the present invention, a through-hole is defined in a predetermined area on a bottom surface of a structure body in which the hook coupling structure is provided. A predetermined area of a hook part is disposed within the defined through-hole, and the hook part is supported by the protrusion so that the hook part is not moved back after locked in a locking projection. Therefore, a space utilization rate of the hook coupling structure may increase.

[0118] FIG. 11 is a side view of a hook coupling structure in accordance with another embodiment of the present invention.

[0119] FIG. 12 is a side view of the hook coupling structure before a hook part in accordance with another embodiment of the present invention is inserted.

[0120] Referring to FIGS. 11 and 12, a hook coupling structure 500 in accordance with another embodiment of the present invention includes an upper structure body 510 including a hook part 511 that extends from an upper surface and has a protruding end portion and a lower structure body 520 including a through-hole 530 and a locking projection 540. The through-hole is formed by punching a predetermined area of a bottom surface so that a predetermined area of the hook part is disposed inside the bottom surface, and the locking projection is formed, at a position corresponding to an upper portion of the hook part 511 of the upper structure body 510, by protruding an inner surface of the lower structure body outward.

[0121] Also, the predetermined area of the hook part 511 is inserted into the through-hole to establish a coupling.

[0122] A configuration of the hook coupling structure will be described below in more detail.

[0123] First, the hook part 511 extends from the upper structure body 510 and has the protruding end portion. The hook part is made of a material elastically deformable by a predetermined amount so as to be easily inserted between the locking projection 540 and the through-hole 530.

[0124] Also, the hook part 511 has one side having a parallel shape and the other side having a shape gradually narrowed downward, and thus may be easily inserted between the locking projection 540 and the through-hole 530. The one side of the hook part 511 has the parallel shape so that a force to be supported by the bottom surface is not dispersed, but the shape of the one side is not limited thereto.

[0125] The hook part has a thickness greater than an extension portion of the upper structure body 510, and thus a force to be retained in the locking projection 540 may increase.

[0126] Also, the bottom surface 520 is a lower surface of a structure body in which the hook coupling structure is provided, and the bottom surface includes a first bottom part 521 and a second bottom part 522.

[0127] More particularly, the bottom surface 520 includes the first bottom part 521 positioned on one side of the through-hole and the second bottom part 522 positioned on the other side of the through-hole.

[0128] Among the first bottom part and the second bottom part, the bottom part in a direction, in which the locking projection is not positioned, supports a predetermined area on a non-protruding side of the hook part. In FIG. 11, the second bottom part supports the hook part 511 so that the hook part is not moved back.

[0129] Also, since space utilization increases as a gap between the predetermined area of the hook part 411 and the second bottom part 522 is small, the predetermined area of the hook part and the second bottom part are disposed with a minimum gap or without a gap.

[0130] The hook coupling structure in accordance with the related art as illustrated in FIG. 2 includes the first structure 30 that is disposed as a lower component and the second structure 40 that is disposed above the first structure 30 and has the shape corresponding to the first structure 30.

[0131] In the first structure 30, the locking projection 31 protrudes outward from the predetermined area inside the side wall part, and the support 32 extends upward from the first structure 30 and is spaced the predetermined interval from the locking projection 31.

[0132] Also, in the second structure 40, the hook part 41 includes the body 41_1 that is disposed between the locking projection 31 and the support 32 and extends downward from the second structure 40 and the protrusion part 41_2 that extends from the body 41_1 and protrudes toward the locking projection 31.

[0133] However, as a space-saving is required in the above-described hook coupling structure in accordance with the related art, the support 32 is removed from the hook coupling structure in accordance with the related art so as to improve the space efficiency, and the hook part 511 is supported by using the bottom surface 520 as in the present application. As a result, the space utilization of the hook coupling structure increases.

[0134] Also, the through-hole 530 is formed by punching a predetermined area of the bottom surface so that a predetermined area of a bent portion is disposed inside the bottom surface, and the through-hole has a size greater than or equal to a thickness of the bent portion. Thus, the hook part 511 may be disposed inside the through-hole 530 having the size greater than or equal to the thickness of the hook part 511.

[0135] Also, the locking projection 540 is positioned, while spaced a predetermined height above from the through-hole, and the bent portion of the hook part is locked therein. A distance between the locking projection 540 and the second bottom part 522 is greater than the thickness of the hook part 511 of the hook part.

[0136] Also, an insertion-coupling ridge 550 is defined between the locking projection and the through-hole of the bottom surface so that the bent portion of the hook part is positioned therein.

[0137] Also, the hook coupling structure in accordance with the embodiment of the present invention is applied to various structure bodies of a case in which hook structure bodies are coupled to each other to create a predetermined space, thereby achieving a further improvement in space efficiency for the structure body when compared to the related art.

Embodiment 4

[0138] Next, a battery pack case in accordance with another embodiment of the present invention will be described.

[0139] The battery pack case in accordance with another embodiment of the present invention is a battery pack case including the hook coupling structure in accordance with the above-described embodiment. A hook part is supported by a bottom surface of a battery pack lower case 700 so that the support part is not moved back.

[0140] FIG. 13 is a view of an inner structure of the battery pack case in accordance with another embodiment of the present invention. Here, FIG. 13 is a view in which a portion of an upper surface is cut to show the inside where a hook coupling structure is provided, but a structure of a battery pack upper case is typically provided in a shape in which the upper surface is fully covered.

[0141] Referring to FIG. 13, the battery pack case in accordance with another embodiment of the present invention includes a battery pack lower case 700 equipped with the battery module therein and having an insertion-coupling ridge defined in a predetermined area on a bottom surface and a battery pack upper case 600 including a hook part that has a bent portion in which an end portion protrudes at a position corresponding to the insertion-coupling ridge of the battery pack lower case.

[0142] Also, the insertion-coupling ridge of the lower case and the hook part of the upper case are coupled to each other to establish the hook coupling structure. Also, a plurality of hook coupling structures may be provided to increase a coupling force between the lower case and the upper case.

[0143] A configuration of the battery pack case will be described below in more detail.

[0144] The lower case 700 is equipped with the battery module therein and has the insertion-coupling ridge 750 defined in the predetermined area on the bottom surface, and will be described in detail with reference to FIG. 14.

[0145] FIG. 14 is a cut side view of a hook coupling structure in the battery pack case in accordance with another embodiment of the present invention.

[0146] Referring to FIG. 14, the battery pack lower case includes a through-hole 730 formed by punching a predetermined area on the bottom surface of the battery pack lower case so that a predetermined area of the bent portion of the battery pack upper case is disposed to the inside and a locking projection 740 positioned, while spaced a predetermined height from the through-hole, in a predetermined area that is on a side surface of the battery pack lower case and corresponds to the hook part of the battery pack upper case. The bent portion of the battery pack upper case is locked in the locking projection.

[0147] Also, the battery pack lower case further includes a side wall part 710 positioned on one side of the through-hole and a bottom part 720 positioned on the other side of the through-hole. The bottom part 720 supports a predetermined area on a non-protruding side of the bent portion of the hook part.

[0148] Also, the through-hole 730 has a size greater than or equal to a thickness of the bent portion so that the bent portion 611 is disposed to the inside.

[0149] The side wall part 710 and the bottom part 720 have a structure in which the hook coupling structure in accordance with the embodiment is applied to the battery pack case. The hook part 610 is coupled to the locking projection 740 and supported by the bottom part 720 so that the hook part is not moved back.

[0150] Also, since space utilization increases as a gap between the predetermined area of the bent portion 611 and the bottom part 720 is small, the predetermined area of the bent portion and the bottom part are disposed with a minimum gap or without a gap.

[0151] Also, the locking projection 740 protrudes from the side surface of the battery pack lower case to a predetermined area, and has a shape corresponding to the hook part 610.

[0152] Also, a hook coupling force increases as the surface area in contact with the hook part 610 increases. Thus, for one example, the locking projection has a thickness that is equal to a thickness of an extension portion of the hook part 610 in the upper case 600 and sufficient not to cause a reduction in a space utilization rate of the battery pack case.

[0153] Also, the battery pack upper case 600 includes the hook part 610 having the bent portion 611 in which an end portion protrudes at a position corresponding to the insertion-coupling ridge of the battery pack lower case.

[0154] The hook part 610 includes the bent portion 611 that extends from an upper surface of the structure body and has the protruding end portion, and the hook part is made of a material elastically deformable by a predetermined amount so as to be easily inserted between the locking projection 740 and the through-hole 730.

[0155] Also, the bent portion 611 has one side having a parallel shape and the other side having a shape gradually narrowed downward, and thus may be easily inserted between the locking projection 740 and the through-hole 730. The one side of the hook part 611 has the parallel shape so that a force to be supported by the bottom surface is not dispersed, but the shape of the one side is not limited thereto.

[0156] Also, the bent portion 611 of the hook part has a thickness greater than an extension portion of the hook part, and thus a force to be retained in the locking projection 740 may increase.

[0157] Also, the insertion-coupling ridge 750 is defined between the locking projection and the through-hole of the bottom surface so that the bent portion is positioned therein, and will be described in detail with reference to FIG. 15.

[0158] FIG. 15 is a cut side view of the hook coupling structure in the battery pack case before the hook part in accordance with another embodiment of the present invention is inserted.

[0159] Referring to FIG. 7, the insertion-coupling ridge 750 is a space which is defined between the locking projection 740 and the through-hole 730 and in which the bent portion 611 of the hook part is positioned, and a distance to the bottom part 720 is greater than a diagonal length of the bent portion 611 of the hook part. This configuration enables the bent portion 611 to be easily inserted into the insertion-coupling ridge 750 when the upper case 600 and the lower case 700 are coupled to each other.

[0160] Also, the battery pack case in accordance with another embodiment of the present invention increases in space utilization, and thus may have a smaller battery pack case size or be equipped with more battery cells to achieve an enhanced capacity, when compared to the related art. As a result, a device including the above-described battery pack case may have a smaller size than the related art or a further increased capacity than the related art.

[0161] Here, the technical idea of the present invention has been specifically described with reference to the above embodiments, but it should be noted that the foregoing embodiments are provided only for illustration while not limiting the present invention. Also, it will be understood by those skilled in the art that various embodiments can be made within the scope of the appended claims.