Batteriemodul

Abstract

The invention relates to a battery module comprising a housing element (2) made of a metal material (3) and a cover element (4) made of a metal material (5), which elements are connected to one another by means of a plurality of screw connections (8), so as to form a common interior (6) designed to receive a plurality of battery cells (7), in such a way that an electrical contact is formed between the housing element (2) and the cover element (4), wherein a sealing element (9) is also arranged between the housing element (2) and the cover element (4) in such a way that the interior (6) is sealed off in a fluid-tight manner from an environment (10), wherein the plurality of screw connections (8) is arranged outside of the sealing element (9).

Claims

1. A battery module comprising a housing element (2) made of a metal material (3), and a cover element (4) made of a metal material (5), wherein the housing and cover elements are connected to one another by a plurality of screw connections (8), so as to form a common interior (6) configured for receiving a plurality of battery cells (7), in such a way that an electrical contact is formed between the housing element (2) and the cover element (4), wherein a sealing element (9) is also arranged between the housing element (2) and the cover element (4) in such a way that the interior (6) is sealed off in a fluid-tight manner from an environment (10), characterized in that the plurality of screw connections (8) is arranged outside the sealing element (9).

2. The battery module according to claim 1, characterized in that individual screw connections (8) are arranged spaced apart from one another, and/or a first sealing surface (12) of the housing element (2) and a second sealing surface (13) of the cover element (4) are arranged spaced apart from one another, in such a way that an electromagnetic shielding of the interior (6) from the environment (10) is formed.

3. The battery module according to claim 1, characterized in that the screw connections (8) each comprise a screw receptacle (15), in each of which a screw (16) is received, wherein the housing element (2) or the cover element (4) forms a respective screw receptacle (15), and a bearing surface (18) of the screw receptacle (15) is directly connected to a first contact surface (19) of the housing element (2) or a second contact surface (20) of the cover element (4).

4. The battery module according to claim 3, characterized in that the screw receptacles (15) are screw domes (17).

5. The battery module according to claim 3, characterized in that a bearing surface (18) of a screw receptacle (15) is raised relative to a first sealing surface (12) of the housing element (2) or a second sealing surface (13) of the cover element (4).

6. The battery module according to claim 1, characterized in that the housing element (2) is an aluminum die-cast housing (20).

7. The battery module according to claim 1, characterized in that the cover element (4) is a deep-drawn part (4) made of an aluminum alloy.

8. The battery module according to claim 1, characterized in that the sealing element (9) is an adhesive (90).

9. The battery module according to claim 4, characterized in that a bearing surface (18) of a screw dome (17) is raised relative to a first sealing surface (12) of the housing element (2) or a second sealing surface (13) of the cover element (4), such that a spacing (14) between the first sealing surface (12) of the housing element (2) and the second sealing surface (13) of the cover element (4) is adjustable.

10. A battery module comprising a housing element (2) made of aluminum (30), and a cover element (4) made of aluminum (50), wherein the housing and cover elements are connected to one another by a plurality of screw connections (8), so as to form a common interior (6) configured for receiving a plurality of battery cells (7), in such a way that an electrical contact is formed between the housing element (2) and the cover element (4), wherein a sealing element (9) is also arranged between the housing element (2) and the cover element (4) in such a way that the interior (6) is sealed off in a fluid-tight manner from an environment (10), characterized in that the plurality of screw connections (8) is arranged outside the sealing element (9).

11. The battery module according to claim 10, characterized in that individual screw connections (8) are arranged spaced apart from one another, and/or a first sealing surface (12) of the housing element (2) and a second sealing surface (13) of the cover element (4) are arranged spaced apart from one another, in such a way that an electromagnetic shielding of the interior (6) from the environment (10) is formed.

12. The battery module according to claim 11, characterized in that the screw connections (8) each comprise a screw means receptacle (15), in each of which a screw means (16) is received, wherein the housing element (2) or the cover element (4) forms a respective screw means receptacle (15), and a bearing surface (18) of the screw means receptacle (15) is directly connected to a first contact surface (19) of the housing element (2) or a second contact surface (20) of the cover element (4).

13. The battery module according to claim 12, characterized in that the screw means receptacles (15) are each designed as screw domes (17).

14. The battery module according to claim 13, characterized in that a bearing surface (18) of a screw dome (17), is raised relative to a first sealing surface (12) of the housing element (2) or a second sealing surface (13) of the cover element (4), such that a spacing (14) between the first sealing surface (12) of the housing element (2) and the second sealing surface (13) of the cover element (4) is adjustable.

15. The battery module according to claim 14, characterized in that the housing element (2) is designed as an aluminum die-cast housing (20).

16. The battery module according to claim 15, characterized in that the cover element (4) is a deep-drawn part (4) made of an aluminum alloy.

17. The battery module according to claim 16, characterized in that the sealing element (9) is an adhesive (90).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.

[0025] FIG. 1 is a perspective view of a section of a battery module according to the invention,

[0026] FIG. 2 is a perspective view of a section of a housing element of a battery module according to the invention, and

[0027] FIG. 3 is a sectional view of a screw connection of a battery module according to the invention.

DETAILED DESCRIPTION

[0028] The battery module 1 comprises a housing element 2 which is made of a metal material 3, in particular aluminum 30. The housing element 2 is in particular designed as an aluminum die-cast housing 20.

[0029] The battery module 1 comprises a cover element 4 which is made of a metal material 5, in particular aluminum 50. The cover element 4 is in particular designed as a deep-drawn part 40 made of an aluminum alloy.

[0030] The housing element 2 and the cover element 4 are connected to one another, forming a common interior 6 (not visible in FIG. 1) which is designed to receive a plurality of battery cells 7. In this case, the plurality of battery cells 7, which is received in the interior 6, is likewise not visible in FIG. 1.

[0031] In this case, the housing element 2 and the cover element 4 are connected to one another by means of a plurality of screw connections 8. The connection is designed in such a way that an electrical contact is formed between the housing element 2 and the cover element 4. The screw connections 8 each comprise a screw means receptacle 15, in each of which a screw means 16 is received.

[0032] In this case, for example, the housing element 2 or the cover element 4 can form the respective screw means receptacle 15. In the embodiment shown in FIG. 1, the housing element 2 forms the screw means receptacles 15, for example.

[0033] Furthermore, individual screw connections 8 are arranged spaced apart from one another in such a way that an electromagnetic shielding of the interior 6 from the environment 10 is formed. In particular, a spacing 11 between two screw connections 8 is selected such that an electromagnetic shielding of the interior 6 from the environment 10 is ensured.

[0034] Furthermore, a sealing element 9 is arranged between the housing element 2 and the cover element 4. The sealing element 9 is arranged in such a way that the interior 6 is sealed off in a fluid-tight manner from the environment 10. The sealing element 9 is in particular designed as an adhesive 90.

[0035] Furthermore, a first sealing surface 12 of the housing element 2 and a second sealing surface 13 of the cover element 4 are arranged spaced apart from one another in such a way that an electromagnetic shielding of the interior 6 from the environment 10 is formed. In particular, a spacing 14 between the first sealing surface 12 and the second sealing surface 13 is selected such that an electromagnetic shielding of the interior 6 from the environment 10 is ensured.

[0036] In this case, the plurality of screw connections 8 is arranged outside of the sealing element 9.

[0037] FIG. 2 is a perspective view of a section of a housing element 2 of a battery module 1 according to the invention.

[0038] In particular, it can be seen in FIG. 2 that the screw means receptacles 15 are each designed as screw domes 17.

[0039] The screw means receptacle 15 of the housing element 2 or the screw dome 17 of the housing element 2 has a bearing surface 18. This bearing surface 18 is designed to be directly connected to a second contact surface 19 of the cover element 4. Should the screw means receptacle 15 or the screw dome 17 be arranged on the cover element 4, the bearing surface 18 would be designed to be directly connected to a first contact surface 20 of the housing element 2.

[0040] The bearing surface 18 of the screw means receptacle 15, in particular of the screw dome 17, is raised relative to the first sealing surface 12 of the housing element 2. In particular, a spacing 14 between the first sealing surface 12 of the housing element 2 and the second sealing surface 13 of the cover element 4 is thereby adjustable.

[0041] It can be seen here that the shape of the screw dome 17 allows the sealing element 9 to be kept away from the screw connection 8. In this case, the bearing surface 18 is designed to be just large enough that the region under a head 161, described in FIG. 3, is minimized, but the permissible surface pressure is nevertheless not exceeded. This has the advantage that the contact surface for corrosive infiltration in the region in front of the screw connection 8 is minimized by the surface pressure.

[0042] FIG. 2 also shows the first sealing surface 12 of the housing element 2.

[0043] Furthermore, the spacing 11 between two screw connections 8 is shown.

[0044] In addition, the resulting spacing 14 between the first sealing surface 12 and the second sealing surface 13 can be seen. In particular, this spacing 14 corresponds to the increase in height of the bearing surface 18 of the screw means receptacle 15 or the screw dome 17.

[0045] FIG. 3 is a sectional view of a screw connection 8. In particular, a sectional view through the screw connection 8 between the housing element 2 and the cover element 4 is shown.

[0046] First of all, the housing element 2 and the cover element 4 can be seen. Furthermore, the sealing element 9 can also be seen.

[0047] The screw connection 8 comprises a screw means receptacle 15, which is designed in particular as a screw dome 17 and in which a screw means 16 is received.

[0048] As a result, a first direct contact 21, in particular a metal contact, is formed between a head 161 of the screw means 16 and the cover element 4.

[0049] Furthermore, a second direct contact 22, in particular a metal contact, is thereby formed between the housing cover 4 and the screw means receptacle 15 of the housing element 2 or the screw dome 17 of the housing element 2.

[0050] Furthermore, a third direct contact 23, in particular a metal contact, is thereby formed between the screw means receptacle 15 of the housing element 2 or the screw dome 17 of the housing element 2, and the screw means 16.

[0051] By means of the first direct contact 21, the second direct contact 22 and the third direct contact 23, an electrical contact for an electromagnetically compatible connection between the housing element 2 and the cover element 4 can be formed overall.

[0052] In particular, a hard joint is formed by the metal contacts. In this case, no material of the sealing element 9 is arranged in the screw region, which could lead to an interference of the EMC connection or to a setting of the screw connection 8.

[0053] The embodiment of the bearing surface 18 of the screw domes 17 is preferably geometrically designed such that no stress peaks arise for the sealing adhesive bond. The contour towards the sealing surface is designed as a continuous line in order to minimize stress concentrations of the sealing adhesive bond in the region of the screw domes 17. In this case, the outer contour of the screw domes 17 is geometrically designed such that the width of the permissible gap in combination with the height of the permissible gap meets the EMC requirements.