INSULATING MOLDING FOR A BATTERY CELL

Abstract

An insulating molding (1) for a housing of at least one battery cell is disclosed, specifically for a housing of at least one lithium-ion battery cell, wherein, on at least one molding sidewall (3a, 3b) of the insulating molding (1), a depression (5) is configured, which is constituted by means of a reduced wall thickness, in order to reduce the force acting on the battery cell.

Claims

1. An insulating molding (1) for a housing of at least one battery cell, wherein, on at least one molding sidewall (3a, 3b) of the insulating molding (1), a depression (5) is configured, which is constituted by means of a reduced wall thickness, in order to reduce the force acting on the battery cell.

2. The insulating molding (1) according to claim 1, characterized in that the insulating molding (1) comprises at least four molding sidewalls (3a, 3b), or in that the insulating molding (1) comprises at least four molding sidewalls (3a, 3b), and a molding base (4), and/or comprises a molding top cover.

3. The insulating molding (1) according to claim 1, characterized in that the insulating molding (1) lies on the housing sidewalls of a battery cell, or the insulating molding (1) lies on the housing sidewalls of a battery cell and on a housing base and/or on a housing top cover of a battery cell.

4. The insulating molding (1) according to claim 1, characterized in that the reduction in wall thickness is applied to an outer side (33a) of the at least one molding sidewall (3a, 3b), such that the depression (5) is configured in the direction of the battery cell which is at least partially enclosed by the insulating molding (1).

5. The insulating molding (1) according to claim 1, characterized in that the reduction in wall thickness is applied to an inner side (33i) of the at least one molding sidewall (3a, 3b), such that the depression (5) extends away from the battery cell (1) which is at least partially enclosed by the insulating molding (1).

6. The insulating molding (1) according to claim 1, characterized in that the reduction in wall thickness is applied to an inner side (33i) and an outer side (33a) of the at least one molding sidewall (3a, 3b), such that two, depressions (5) are configured.

7. The insulating molding (1) according to claim 1, characterized in that the inner side (33i) and/or the outer side (33a) of the at least one molding sidewall (3a, 3b), in the region of the reduction in wall thickness, is cambered inwards towards the battery cell, which is at least partially enclosed by the insulating molding (1), or is cambered outwards from the battery cell, which is at least partially enclosed by the insulating molding (1), thus forming the depression (5).

8. The insulating molding (1) according to claim 1, characterized in that the depression (5) is located in a central zone of the at least one molding sidewall (3a, 3b), which is circumferentially enclosed by an edge zone (7) of the at least one molding sidewall (3a, 3b).

9. The insulating molding (1) according to claim 1, characterized in that the insulating molding (1) is configured as a housing for at least one battery cell (10).

10. The insulating molding (1) as claimed in claim 1, characterized in that the insulating molding (1) is comprised of a plastic.

11. The insulating molding (1) as claimed in claim 1, characterized in that the insulating molding (1) is produced by an injection-molding process.

12. The insulating molding (1) as claimed in claim 1, characterized in that the insulating molding (1) has a beading (9) at one edge of the molding sidewall (3a, 3b).

13. A battery cell, having an insulating molding (1) according to claim 1, wherein the insulating molding (1) lies on the housing sidewalls of the battery cell, or wherein the insulating molding (1) lies on the housing sidewalls of the battery cell and on a housing base and/or a housing top cover of the battery cell, or wherein the insulating molding (1) constitutes a housing of the battery cell.

14. A battery, comprising at least two battery cells according to claim 13.

15. The battery as claimed in claim 14, wherein the battery cells comprise insulating moldings (1) having depressions (5) of different sizes.

16. The insulating molding (1) according to claim 1, characterized in that the insulating molding (1) comprises at least four molding sidewalls (3a, 3b), which are configured with a full-surface design, or in that the insulating molding (1) comprises at least four molding sidewalls (3a, 3b), which are configured with a full-surface design, and a molding base (4), which is configured with a full-surface design, and/or comprises a molding top cover.

17. The insulating molding (1) according to claim 1, characterized in that the insulating molding (1) lies directly on the housing sidewalls of a battery cell, or the insulating molding (1) lies directly on the housing sidewalls of a battery cell and on a housing base and/or on a housing top cover of a battery cell.

18. The insulating molding (1) according to claim 1, characterized in that the reduction in wall thickness is applied to an inner side (33i) and an outer side (33a) of the at least one molding sidewall (3a, 3b), such that two mutually-opposing depressions (5) are configured.

19. The insulating molding (1) as claimed in claim 1, characterized in that the insulating molding (1) is comprised of a thermoplastic material.

20. A lithium-ion battery cell, having an insulating molding (1) according to claim 1, wherein the insulating molding (1) lies directly on the housing sidewalls of the battery cell, or wherein the insulating molding (1) lies directly on the housing sidewalls of the battery cell and on a housing base and/or a housing top cover of the battery cell, or wherein the insulating molding (1) constitutes a housing of the battery cell.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Forms of embodiment of the present invention are represented in the drawing, and are described in detail in the following description of the figures. Herein:

[0034] FIG. 1 shows a schematic representation of an insulating molding according to the invention for at least one housing of a battery cell having a depression, in a first form of embodiment, in a 3D view;

[0035] FIG. 2 shows a schematic representation of a vertical section of the insulating molding according to the invention represented in FIG. 1;

[0036] FIG. 3 shows a schematic representation of a vertical section of an insulating molding according to the invention for at least one housing of a battery cell, having a depression, in a second form of embodiment;

[0037] FIG. 4 shows a schematic representation of a vertical section of an insulating molding according to the invention for at least one housing of a battery cell, having a depression, in a third form of embodiment;

[0038] FIG. 5 shows a schematic representation of a vertical section of an insulating molding according to the invention for at least one housing of a battery cell, having a depression, in a fourth form of embodiment;

[0039] FIG. 6 shows a schematic representation of the insulating molding according to the invention represented in FIG. 1, having a beading, in a 3D view.

DETAILED DESCRIPTION

[0040] FIG. 1 shows a first form of embodiment of an insulating molding 1 for at least one housing of a battery cell. The insulating molding 1 comprises two long molding sidewalls 3a and two short molding sidewalls 3b, which are configured with a full-surface design. The long molding sidewalls 3a each comprise an outer side 33a and an inner side 33i. The insulating molding 1 moreover comprises a molding base, which is not visible in FIG. 1. Alternatively, the insulating molding 1 incorporates no molding base. As a further alternative, the insulating molding 1 comprises an unrepresented molding top cover. The insulating molding 1, on the long molding sidewall 3a, incorporates a depression 5, which is configured in the form of a reduced wall thickness in the long molding sidewall 3a. In FIG. 1, only the depression 5 in one of the long molding sidewalls 3a is visible. In FIG. 1, the reduction in the wall thickness of the long molding sidewall 3a is configured on the outer side 33a of the long molding sidewall 3a, such that a depression 5 is formed in the direction of an opposing long molding sidewall 3a. In FIG. 1, the depression 5 is located in a central zone of the long molding sidewall 3a. The depression 5 is circumferentially enclosed by an edge zone 7 of the long molding sidewall 3a. Alternatively, only one of the long molding sidewalls 3a incorporates a depression 5. As a further alternative, or additionally, one or both of the short molding sidewalls 3b incorporates a depression 5.

[0041] The insulating molding 1 is comprised, for example, of a plastic, specifically a thermoplastic material such as, for example, a polyamide, a polyethylene, a polypropylene, a polyethylene terephthalate or a polyvinyl chloride, or mixtures thereof. The insulating molding 1 is produced, for example, as a one-piece component by means of an injection-molding process. Alternatively, the insulating molding 1 can also be comprised of a number of components.

[0042] A battery cell, which is not represented in FIG. 1, is insertable in the insulating molding 1. In an unrepresented form of embodiment, the insulating molding 1 itself forms the housing of a battery cell.

[0043] FIG. 2 represents the insulating molding 1 according to FIG. 1, in a sectional view along the section line A-A. In FIG. 2, the depressions 5 are partially cambered. The wall thickness of the long molding sidewall 3a of the insulating molding 1 decreases continuously in the direction of the depression 5 or, leading away from the depression 5, shows a continuous increase. In the center of the depression 5, the wall thickness neither decreases nor increases. Moreover, in this representation, the molding base 4 is visible. Additionally, in FIG. 2, a battery cell 10 is inserted in the insulating molding, such that all the battery cell housing sidewalls of the battery cell 10 are enclosed by the molding sidewalls 3a, 3b of the insulating molding 1, and the battery cell housing base is enclosed by the molding base 4 of the insulating molding 1. Upon the distension of the battery cell 10, the latter compresses the long molding sidewalls 3a in the depression 5 outwardly in the direction of an arrow D.

[0044] FIG. 3 shows a sectional view of a second form of embodiment of an insulating molding 1 according to the invention. Conversely to the first form of embodiment of the insulating molding 1 represented in FIGS. 1 and 2, the reduction in the wall thickness of the long molding sidewalls 3a in FIG. 3 is configured on the inner side 33i of the long molding sidewalls 3a, such that the depression 5 extends away from the battery cell 10 inserted in the insulating molding 1. In FIG. 3, the depressions 5 are partially cambered. The wall thickness of the long molding sidewall 3a of the insulating molding 1 decreases continuously in the direction of the depression 5 or, leading away from the depression 5, shows a continuous increase. In the center of the depression 5, the wall thickness does not change, but remains constant. Upon the distension of the battery cell 10, the battery cell 10 progressively occupies the depression 5 in the insulating molding 1, at least partially.

[0045] FIG. 4 shows a sectional view of a third form of embodiment of an insulating molding 1 according to the invention. Conversely to the first and second forms of embodiment of the insulating molding 1, the reduction in the wall thickness of the long molding sidewalls 3a in FIG. 4 are configured on both the inner side 33i and the outer side 33a. Two depressions 5 are thus configured on each long molding sidewall 3a. The depression 5 which is formed on the outer side 33a of the long molding sidewall 3a of the insulating molding 1 extends towards the battery cell 10 which is enclosed by the insulating molding 1. The depression 5 which is formed on an inner side 33i of the long molding sidewall 3a of the insulating molding 1 extends away from the battery cell 10 which is inserted in the insulating molding 1. In FIG. 3, the depressions 5 are partially cambered. The wall thickness of the long molding sidewall 3a of the insulating molding 1 decreases continuously in the direction of the depression 5 or, leading away from the depression 5, shows a continuous increase. In the center of the depression 5, the wall thickness does not change, and shows no further decrease or increase. The depression 5 on the outer side 33a of the long molding sidewall 3a is arranged in opposition in a mirror image to the depression 5 on the inner side 33i of the long molding sidewall 3a. Alternatively, the depressions 5 are not arranged in opposition, but are configured in a mutually offset arrangement.

[0046] FIG. 5 shows a sectional view of a fourth form of embodiment of an insulating molding 1 according to the invention. Conversely to the preceding forms of embodiment of the insulating molding 1, the depression 5 is configured as a full camber. This means that the wall thickness of the long molding sidewall 3a in the depression 5 decreases or increases in a continuous manner. Accordingly, there is no step-like transition within the depression 5.

[0047] In FIG. 5, the reduction in the wall thickness is configured on the inner side 33i of the long molding sidewall 3a, such that the depression 5 extends way from the battery cell 10 inserted in the insulating molding 1. Alternatively or additionally, for example, corresponding depressions 5 are configured, which are formed by a reduction of the wall thickness on the outer side 33a of the long molding sidewalls 3a.

[0048] FIG. 6 represents the insulating molding 1 according to FIG. 1, with the distinction that the insulating molding 1 is provided with a beading 9 on one edge of the molding sidewalls 3a, 3b. The beading 9 is configured on an upper side of the molding sidewalls 3a, 3b. Alternatively or additionally, the beading 9 is configured on an underside of the molding sidewalls 3a, 3b if, for example, there is no molding base or molding top cover adjoining thereto.

[0049] All of the forms of embodiment described can be mutually combined as required. The depressions 5 in the figures are arranged centrally in the long molding sidewalls 3a, and are arranged in mutual opposition. Alternatively or additionally, the depressions 5 are incorporated in the short molding sidewalls 3b. As a further alternative, the depressions 5 are not centrally positioned in the molding sidewalls 3a, 3b. Moreover, the depressions 5, for example, are at least partially arranged at different positions on the same molding sidewall 3a, 3b and/or are at least partially arranged at different positions on two mutually-opposing molding sidewalls 3a, 3b, such that these are not arranged in opposition in mirror image, but are offset.

[0050] In one form of embodiment, for example, two or more battery cells, each having an insulating molding 1 according to the invention, are arranged sequentially to form a battery module. In this arrangement, the insulating moldings 1, for example, incorporate depressions 5 of different size and/or of different depth. Alternatively or additionally, the depressions 5 are positioned, for example, on different molding sidewalls 3a, 3b of the insulating molding 1 and/or at different positions on the same molding sidewall 3a, 3b. A battery, having at least two battery cells with an insulating molding 1 according to the invention, can be employed, for example, in motor vehicles, specifically in hybrid or electrically-powered vehicles.