Assembly for a storage battery, motor vehicle equipped with such an assembly and method for producing such an assembly

Abstract

The invention relates to an assembly (10) for a storage battery, comprising: - a receiving support (20), the support having, in a bottom portion (22), a cooling circuit (27), the bottom portion being bordered by two side walls (23, 25); and - a storage battery module (30) comprising a front portion (34) provided with a front wall (34A) bordered by a side wall (34B), the side wall extending in parallel with the side walls of the support, the front wall and the side wall of the module delimiting a housing for receiving a plurality of storage cells, the plurality of cells being held in the module by at least one holding element (32), the assembly comprising at least one removable shim (40) positioned between the side walls of the support and the side wall of the module. The invention likewise relates to an associated motor vehicle and to a method for producing such an assembly.

Description

BATTERY ASSEMBLY, MOTOR VEHICLE EQUIPPED WITH SUCH A BATTERY ASSEMBLY ASSEMBLY AND METHOD FOR MANUFACTURING SUCH AN ASSEMBLY TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates generally to the field of accumulator batteries.

[0002] The invention relates more particularly to an assembly for an accumulator battery.

[0003] It also concerns a motor vehicle equipped with such an assembly.

[0004] The invention finally relates to a method of manufacturing such an assembly for a storage battery. STATE OF THE ART

[0005] Electrically powered motor vehicles, including hybrid thermal and electric vehicles, are generally equipped with an electric motor supplied with current by a plurality of storage battery modules.

[0006] Conventionally, each storage battery module is formed from a housing that houses a plurality of storage battery cells.

[0007] Such an accumulator battery module is known, for example, from document EP3637495.

[0008] In this document, the housing has a rear part topped by a cover so as to define a housing for the accumulator cells. The rear part has a U-shaped part, made of a single piece, with a bottom wall and two side walls. Two side cover plates complete the side walls of the rear part so as to obtain a closed structure.

[0009] The cover engages with the rear part by snapping into place. The entire housing (including the cover) then forms a rigid structure to accommodate the accumulator battery cells.

[0010] A thermally conductive layer is arranged at the bottom wall of the rear part (typically the base of the U of the U-shaped part) so as to allow the cooling of the accumulator battery cells.

[0011] In such a configuration, the accumulator battery cells are glued to the back wall of the rear part.

[0012] However, this configuration, with a U-shaped rear part leading to a rigid structure for housing the accumulator battery cells, does not allow for optimal management of the expansion of the cells resulting from the thermal forces generated by the cells themselves during their charging and discharging. PRESENTATION OF THE INVENTION

[0013] In order to overcome the aforementioned drawbacks, the present invention proposes to improve the manufacture of an assembly for an accumulator battery.

[0014] More particularly, the invention provides an assembly for a storage battery, comprising: - a support for receiving a storage battery module, said support for receiving having, in a bottom part, a cooling circuit, the bottom part being bordered by at least two side walls, and - a storage battery module comprising a front part provided with a front wall bordered by a side wall, said side wall extending parallel to the side walls of the receiving support, the front wall and the side wall of the storage battery module delimiting a housing for receiving a plurality of storage cells, said plurality of storage cells being held in the storage battery module by at least one holding element.

[0015] According to the invention, said assembly for accumulator battery comprises at least one removable wedge positioned between one of the side walls of the receiving support and the side wall of the accumulator battery module.

[0016] Thus, according to the present invention, the presence of the removable shims between the side wall of the front part of the accumulator battery module and the side walls of the receiving support makes it possible to limit the lateral displacement of the walls of the front part. This then makes it possible to restrict the stresses exerted on the side wall of the front part to stresses remaining within the elastic deformation range of the materials forming the front part, in particular during the charging phases of the accumulator battery cells. This ultimately makes it possible to avoid the breakage of the elements forming the accumulator battery module.

[0017] Additionally, the use of a battery cell holding element of accumulators allows these cells to be put in direct contact with the cooling circuit and therefore improves thermal exchanges leading to the cooling of the accumulator battery module.

[0018] Other advantageous and non-limiting characteristics of the accumulator battery assembly according to the invention, taken individually or in all technically possible combinations, are the following: - each wedge comprises a metal tab on which an elastically deformable element is fixed; - the elastically deformable element is positioned between the metal tab and the side wall of the accumulator battery module; - the elastically deformable element has a face, facing the side wall of the accumulator battery module, having a convex shape; - the elastically deformable element is formed by a melamine foam; - the elastically deformable element is fixed by gluing to the metal tab; - for each wedge, a means is provided for blocking a part of the wedge concerned against the front wall of the accumulator battery module; - each locking means is welded onto the front wall of the accumulator battery module; - each holding element is in the form of a metal strap extending, opposite the front wall of the storage battery module, between a first part and a second part of the side wall of the storage battery module; - at least three metal straps are provided; - each metal strap has a thickness greater than 0.2 millimeters; - at least six wedges are provided; - several wedges are provided which are positioned against two opposite side walls of the receiving support; - thermal paste is provided between the cooling circuit and the plurality of accumulator cells; and - the receiving support comprises means for fixing said accumulator battery module, said fixing means being intended to cooperate with elements for fixing the side wall of said accumulator battery module.

[0019] The invention also relates to a motor vehicle comprising an accumulator battery assembly as introduced previously.

[0020] The invention also relates to a method of manufacturing an accumulator battery assembly, the method comprising steps of: - provision of a support for receiving a storage battery module, said support having, in a bottom part, a cooling circuit, the bottom part being bordered by at least two side walls, - provision of a storage battery module comprising a front wall bordered by a side wall, said side wall extending parallel to the side walls of the receiving support, the front wall and the side wall of the storage battery module delimiting a housing for receiving a plurality of storage cells, said plurality of storage cells being held in the storage battery module by at least one holding element so as to be placed in contact with the cooling circuit, - positioning the storage battery module in the receiving support so as to place the plurality of storage battery cells in contact with the cooling circuit, and - positioning of at least one removable wedge between the side walls of the receiving support and the side wall of the accumulator battery module.

[0021] Of course, the various features, variants and embodiments of the invention may be combined with each other in various combinations to the extent that they are not incompatible or mutually exclusive. DETAILED DESCRIPTION OF THE INVENTION

[0022] The description which follows with reference to the appended drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be implemented.

[0023] On the attached drawings:

[0024] [Fig. 1] represents a schematic view of a motor vehicle equipped with an accumulator battery assembly according to the invention;

[0025] [Fig. 2] is an exploded view of the battery pack assembly for storage batteries of Figure 1; and

[0026] [Fig. 3] is a schematic view of a wedge positioned between a receiving support and a storage battery module according to the invention.

[0027] In Figure 1, there is shown a motor vehicle 1 equipped with an assembly 10 for an accumulator battery according to the invention.

[0028] This motor vehicle 1 is an electric or hybrid motor vehicle equipped with an electric motor. At least one battery pack 10 is designed to supply electric current to the electric motor of the motor vehicle 1.

[0029] As shown in Figures 1 and 2, the assembly 10 for a storage battery comprises a receiving support 20 for a storage battery module (also called "receiving support 20" in the following) and at least one storage battery module 30 (also called "module 30" in the following).

[0030] The receiving support 20 is for example here secured to the motor vehicle 1, while the accumulator battery module 30 is attached to the receiving support 20.

[0031] Figure 2 shows a schematic exploded perspective view of the elements included in the storage battery module 30. This module 30 includes a front part 34 and a plurality of storage battery cells (the storage battery cells are not shown in the figures).

[0032] In this description, the terms "front" and "rear" are used in relation to the positioning of the element on the receiving support (on which the element concerned is attached). The rear of this element designates the side facing the receiving support on which the element is attached while the front designates the side facing away from this receiving support.

[0033] As shown in FIG. 2, the front portion 34 of the storage battery module 30 comprises a front wall 34A bordered by a side wall 34B, extending from the front wall 34A. The side wall 34B of the front portion 34 extends towards the receiving support 20. In other words, the side wall 34B of the front wall 34 extends, from the front wall 34A, towards the rear of the storage battery module 30. This side wall 34B thus comprises four sides orthogonal in pairs.

[0034] The front part 34 is for example formed from aluminum.

[0035] As shown in Figure 2, the side wall 34B of the front part has, at its corners, fixing elements 34C to the receiving support 20 of the motor vehicle 1.

[0036] These fixing elements 34C are presented here in the form of columns pierced with a longitudinal opening designed to cooperate with complementary fixing means 22A present on the receiving support 20.

[0037] The plurality of storage battery cells is positioned in a receiving housing delimited by the front wall 34A and the side walls 34B of the front part 34. The storage battery cells are for example positioned next to each other. There are for example sixteen of them here.

[0038] The cells are, for example, flexible-shell cells, i.e. cells whose shells can deform when inserted into the housing and when charged and discharged. Advantageously, the front portion 34 of the accumulator battery module 30 makes it possible to contain the deformation of the cells thanks to its properties described above.

[0039] More specifically, soft-shell cells have a soft outer shell that contains inside an electrolyte of organic solution or a solution based on lithium carbonate and salts.

[0040] For example, a lithium-ion electrolyte is wrapped in a plastic film envelope surrounded by a laminated aluminum film. The plastic film is intended to insulate the electrolyte contained in the cell from the aluminum film.

[0041] These soft-shell cells, well known to those skilled in the art, will not be described in more detail here.

[0042] In practice, the plurality of storage battery cells is held in the front portion 34 of the storage battery module by at least one holding element 32. In other words, since the front portion 34 does not have a wall opposite the front wall 34 (which could have made it possible to hold the cells), the holding element 32 makes it possible to support the plurality of storage battery cells so that it is attached to the front portion 34. The storage battery cells are therefore retained in the receiving housing delimited by the front wall 34A and the side walls 34B of the front portion. 34.

[0043] Here, the holding element 32 is in the form of a metal strap. This metal strap 32 extends between a first part 35A and a second part 35B, opposite the first part 35A, of the side wall 34B of the front part 34, so as to hold the accumulator battery cells in the housing delimited by the front wall 34A and the side wall 34B of the front part 34 (therefore so as to hold the accumulator battery cells in the module 30).

[0044] In other words, this metal strap 32 extends through an open portion of the front portion 34, this open portion being located opposite the front wall 34A. In practice, each metal strap 32 extends between the two large sides of the side wall 34B of the front portion 34, so as to pass under the plurality of accumulator cells in order to block them against the front wall 34A of the front portion 34.

[0045] As shown in Figure 2, at least three metal straps 32 are provided here.

[0046] Each metal strap 32 is for example formed from steel. The free ends of each metal strap 32 are here fixed by welding to the side wall 34B of the front part 34.

[0047] Here, each metal strap has a thickness greater than or equal to 0.2 millimeters (mm).

[0048] Finally, the accumulator battery module 30 is here formed by the front part 34 housing the accumulator battery cells, held by the metal straps 32.

[0049] In order to enable the electric current to be supplied to the electric motor of the motor vehicle 1, the accumulator battery module 30 (formed by the front part 34 housing the accumulator battery cells held by the metal straps 32) is positioned in the receiving support 20.

[0050] As shown in Figure 2, the receiving support 20 here has a generally parallelepiped shape. It comprises a bottom part 22 of rectangular shape, from the edges of which rise three side walls 23, 24, 25 which delimit between them a housing 21 for receiving the accumulator battery module 30. Here, the two side walls 23, 25 are located opposite each other while opposite the side wall 24, the support reception 20 also has a side wall portion extending opposite this side wall 24 (but which is not shown in FIG. 2 for the sake of clarity). The side walls 23, 24, 25 extend parallel to the side wall 34B of the front part 34.

[0051] The receiving support 20 comprises, at its bottom part 22, a cooling circuit 27. The cooling effect is for example obtained from the circulation of water in the cooling circuit 27.

[0052] The cooling circuit 27 is designed to cool, by conduction, the storage battery cells. For this, the plurality of storage battery cells of the storage battery module 30, held by the metal straps 32 in the receiving housing delimited in the front part 34, is positioned in contact with the bottom part 22 of the receiving support 20. Thus, the storage battery cells are directly in contact with the cooling circuit 27, which makes it possible to significantly improve the efficiency of the heat exchanges.

[0053] In order to further improve the efficiency of the conduction phenomenon (and therefore the cooling), a thermal paste 26 is positioned between the bottom part 22 of the receiving support 20 and the plurality of accumulator battery cells of the module 30.

[0054] This thermal paste 26 makes it possible to prevent the formation of an air gap between the cooling circuit 27 and the accumulator battery cells, which makes it possible to improve the conduction phenomenon and therefore the cooling.

[0055] The receiving support 20 is for example formed here so as to be impervious to water drops or dust which could enter the assembly 10 for accumulator battery. The sealing is here evaluated according to the IP67 standard according to the EN60529 standard.

[0056] In order to allow the module 30 to be fixed to the receiving support 20, the bottom portion 22 of the receiving support 20 comprises fixing means 22A. These fixing means 22A are designed to cooperate with the fixing elements 34C of the front portion 34 of the side wall 34B of the module 30. There are as many fixing means 22A as there are fixing elements 34C on the side wall 34B of the front portion 34 of the module 30.

[0057] Here, as shown in Figure 2, the fixing means 22A are formed by lugs 22A projecting from the bottom part 22 of the support. reception 20. These lugs 22A extend, from the bottom part 22, towards the front of the reception support 20.

[0058] Each lug 22A cooperates here, by interlocking, with a corresponding longitudinal opening of a column 34C of the side wall 34B of the front part 34.

[0059] As previously stated, accumulator battery cells swell during operation (charging and discharging). This swelling causes expansion of the front wall 34A and the side wall 34B of the front portion 34 and the metal straps 32.

[0060] Advantageously according to the invention, in order to contain this phenomenon of swelling and expansion (which may in particular lead to the rupture of these different elements), the assembly 10 for the storage battery comprises at least one removable wedge 40 (figures 2 and 3) positioned between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34 (of the storage battery module 30).

[0061] In this description, the term "removable" means that the shim 40 can be removed from the accumulator battery assembly 10 (even after having been inserted into the assembly 10), without it being necessary to dismantle (or even destroy) a part of this shim 40 or of the assembly 10.

[0062] As can be seen in Figure 2, six wedges 40 are provided here. The wedges 40 are for example positioned at the level of the opposite side walls 23, 25 of the receiving support 20. More particularly here, each wedge 40 is positioned at the level of (i.e. opposite) the end of each metal strap 32 fixed to the side wall 34B of the front part 34.

[0063] In practice according to the invention, each wedge 40 comprises a metal tab 42 and an elastically deformable element 44 (figures 2 and 3).

[0064] In this description, the term "elastically deformable" means an element capable of undergoing reversible deformation when forces, for example compression, are applied to it (the elastically deformable element returns to its initial shape and size when the forces are no longer applied).

[0065] Here, the elastically deformable element 44 is preferably compressible (i.e., it can be deformed by a compressive force applied to it, the compression axis being parallel to a longitudinal axis of the elastically deformable element 44).

[0066] As shown in Figures 2 and 3, the metal tab 42 has an L-shape whose base 42A is positioned at the front of the storage battery module 30. In other words, the branch 42B of the L-shape extends parallel to the side walls 23, 25 of the receiving support 20 and to the side wall 34B of the front part 34.

[0067] Here, the metal tab 42 is formed from steel, for example by bending a steel strip so as to obtain the L shape. Here, the base 42A of the L shape has a length of between 15 and 40 mm, preferably of the order of 25 mm. The branch 42B of the L shape has a length of between 70 and 100 mm, preferably of the order of 86 mm. Finally, the width of the metal tab 42 is here between 15 and 40 mm, preferably of the order of 30 mm.

[0068] As can be seen in Figures 2 and 3, the elastically deformable element 44 is positioned between the metal tab 42 and the side wall 34B of the front part 34 of the module 30.

[0069] The elastically deformable element 44 here has a generally parallelepiped shape. It is provided in particular with a face 44B having a convex shape.

[0070] Advantageously, this convex shape theoretically allows, if the compressive stresses are very low, a point contact between the elastically deformable element 44 and the side wall 34B of the front part 34. The insertion of the wedge 40 between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34 is therefore facilitated. This also makes it possible to reduce the hyperstaticity of the module 30 relative to the receiving support 20. Thus, the implementation of a better positioning of the accumulator battery module 30 on the receiving support 20 is possible.

[0071] In order to obtain the wedge effect of the accumulator battery module 30 on the receiving support 20, the elastically deformable element 44 has a thickness strictly greater than the space available between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34. The wedge 40 can thus be introduced between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34 by compressing the elastically deformable element 44. The latter then returns to its initial shape after its introduction so as to block the accumulator battery module 30 in the receiving support 20 (along an axis orthogonal to the long sides of the side wall...).

[0072] Here, the elastically deformable element 44 is for example formed from a melamine foam.

[0073] In practice, the elastically deformable element 44 is fixed to the metal tab 42. More particularly, it is fixed to the branch 42B of the metal tab 42. It is for example here fixed by gluing to the metal tab 42.

[0074] The elastically deformable element 44 is fixed to the metal tab 42 at the face opposite the face 44B having a convex shape. As shown in Figures 2 and 3, the face 44B having the convex shape is turned towards the side wall 34B of the front part 34 of the module 30.

[0075] As can also be seen in Figures 2 and 3, the elastically deformable element 44 is fixed to the branch 42B of the metal tab 42 at a distance from the base 42A. This then makes it possible to define a space 45 (forming a clearance) between the elastically deformable element 44 and the base 42A of the metal tab 42 so as to facilitate the disassembly of the shims 40 from the assembly 10 for the accumulator battery.

[0076] In order to maintain the wedge 40 in position between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34, a locking means 50 is provided for the wedge 40 concerned. Here, one locking means 50 is provided for each wedge 40.

[0077] This locking means 50 is here formed by a metal element designed to hold the base 42A of the metal tab 42 against the front wall 34A of the front part 34. In other words here, the base 42A of the metal tab 42 is inserted between the locking means 50 and the front wall 34A of the front part 34 in order to lock the wedge 40 in position. The locking means 50 is for example formed by a metal clip designed to pinch the base 42A of the metal tab 42 against the front wall 34A of the front part 34 of the module 30.

[0078] Here, the locking means 50 is fixed by welding to the front wall 34A of the front part 34.

[0079] Alternatively, the locking means may be fixed to the front wall of the front part by any other mechanical fixing means. For example, it may be fixed to the front wall by gluing.

[0080] According to an alternative embodiment, maintaining the battery cells of accumulators in the front part of the module can be achieved in different ways. For example, a holding element positioned at the rear of the front wall and cooperating with the individual cells in such a way as to fix them to the front part of the accumulator battery module can be envisaged. For example, the accumulator cells can be fixed by gluing, at the rear of the front wall.

[0081] According to another embodiment variant, the cell holding element can be produced by a rear part of the module cooperating before the front part (the rear part and the front part then forming a housing housing the plurality of accumulator cells). In other words, in this variant, the accumulator cells are housed in a housing whose rear part forms the holding element within the meaning of the invention.

[0082] According to another embodiment, the wedges can be locked on the front part of the module by means of a snap-on cooperation with the locking means.

[0083] The embodiment described above only concerns a receiving support associated with a storage battery module.

[0084] The present invention is of course applicable in the case where a plurality of accumulator battery modules are included in the motor vehicle. In such a case, a plurality of accumulator battery assemblies 10 juxtaposed next to each other in the motor vehicle can be considered.

[0085] The present invention also applies in the case of a single receiving support accommodating a plurality of accumulator battery modules (the accumulator battery modules being positioned, for example, next to each other on the bottom of the single receiving support). In this case, the shim elements are positioned between two adjacent accumulator battery modules. The geometry of the elastically deformable element is then adapted to this configuration.

[0086] The present invention also relates to a method of manufacturing the assembly 10 for a storage battery.

[0087] This method firstly comprises a step of providing the receiving support 20.

[0088] It also includes a step of supplying the accumulator battery module 30. This step in practice includes the supply of the front part 34 housing the accumulator battery cells which are held (in the front part 34) by the metal straps 32.

[0089] Then, the manufacturing method comprises a step of positioning the thermal paste 26 at the bottom portion 22 of the receiving support 20. The accumulator battery module 30 is then placed on this thermal paste 26. In other words, the module 30 is placed on the receiving support 30. This step aims to bring the plurality of accumulator battery cells into contact with the cooling circuit 27.

[0090] In practice, the positioning of the module 30 on the receiving support 20 comprises the implementation of cooperation, by interlocking, between the longitudinal openings of each column 34C with the corresponding lugs 22A of the bottom part 22 of the receiving support 20. Once the module 30 is positioned on the receiving support 20, a space is available between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34.

[0091] The manufacturing method then continues with the positioning of at least one removable wedge 40 between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34. The positioning of six wedges 40 is provided here, three between the side wall 23 of the receiving support 20 and the side wall 34B of the front part 34 and three others between the side wall 25 (opposite the side wall 23) of the receiving support 20 and the side wall 34B of the front part 34.

[0092] In practice, a pressure force is applied to each wedge 40 so as to introduce it between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34. This pressure force then makes it possible to compress the elastically deformable element 44 during the introduction of each wedge 40.

[0093] Once each wedge 40 is in position between the side walls 23, 25 of the receiving support 20 and the side wall 34B of the front part 34, the elastically deformable element 44 resumes its shape and size. The wedges 40 then allow the positioning and maintenance of the accumulator battery module 30 on the receiving support 20.

[0094] In order for this positioning to be locked, the base 42A of the metal tab 42 of each wedge 40 is introduced into the locking means 50 corresponding. More particularly, the base 42A of the metal tab 42 is inserted between the locking means 50 and the front wall 34A of the front part 34 in order to lock the wedge 40 in position.

[0095] Finally, thanks to the presence of the shims, the lateral displacement of the walls of the front part of the module is limited. This then makes it possible to ensure that the resulting stress exerted on this front part of the module and on the metal straps remains lower than a so-called plastic flow stress, thus making it possible to remain within the elastic deformation range of the materials of the front part and the metal straps. In other words, this then makes it possible to limit the appearance of stresses which would lead, for example, to shearing of the metal straps.

[0096] These shims therefore help to contain the phenomenon of swelling of the front part (and the metal straps) due to the swelling of the accumulator battery cells during operation.

[0097] Furthermore, the use of metal straps allows the storage battery cells to be held in the front part of the module without the need to implement a process of gluing these cells to a back wall. Heat exchanges are significantly improved with the storage battery cells being in direct contact with the cooling circuit.

[0098] In addition, eliminating this bonding process simplifies the manufacturing of the battery pack assembly and also advantageously reduces its manufacturing cost.

[0099] Finally, the use of removable shims also presents a practical interest concerning the disassembly of the accumulator battery assembly. Indeed, thanks to the space 45 provided between the elastically deformable element 44 and the base 42A of the corresponding metal tab 42, an operator can easily introduce a tool so as to extract the shim 40 concerned from the accumulator battery assembly 10. This then makes it easier to replace an element of the accumulator battery assembly and also to facilitate the maintenance process.

Claims

CLAIMS

1. Assembly (10) for accumulator battery, comprising: - a receiving support (20) for a storage battery module, said receiving support (20) having, in a bottom part (22), a cooling circuit (27), the bottom part (22) being bordered by at least two side walls (23, 25), and - a storage battery module (30) comprising a front part (34) provided with a front wall (34A) bordered by a side wall (34B), said side wall (34B) extending parallel to the side walls (23, 25) of the receiving support (20), the front wall (34A) and the side wall (34B) of the storage battery module (30) delimiting a housing for receiving a plurality of storage cells, said plurality of storage cells being held in the storage battery module (30) by at least one holding element (32), characterized in that said storage battery assembly (10) comprises at least one removable wedge (40) positioned between one of the side walls (23, 25) of the receiving support (20) and the side wall (34B) of the storage battery module (30).

2. An assembly (10) for a storage battery according to claim 1, in which each shim (40) comprises a metal tab (42) on which an elastically deformable element (44) is fixed.

3. The battery pack assembly (10) of claim 2, wherein the elastically deformable member (44) is positioned between the metal tab (42) and the side wall (34B) of the battery pack module (30).

4. An accumulator battery assembly (10) according to claim 2 or 3, wherein the elastically deformable element (44) has a face (44B), facing the side wall (34B) of the accumulator battery module (30), having a convex shape.

5. An assembly (10) for a storage battery according to any one of claims 1 to 4, in which, for each wedge (40), there is provided a means (50) for locking a part of the wedge (40) against the front wall (34A) of the accumulator battery module (30).

6. A battery pack assembly (10) according to any one of claims 1 to 5, wherein each holding element (32) is in the form of a metal strap extending, opposite the front wall (34A) of the battery pack module, between a first portion (35A) and a second portion (35B) of the side wall (34B) of the battery pack module (30).

7. A battery pack assembly (10) according to claim 6, wherein at least three metal straps are provided.

8. A battery pack assembly (10) according to any one of claims 1 to 7, wherein at least six shims (40) are provided.

9. An accumulator battery assembly (10) according to any one of claims 1 to 8, wherein a plurality of shims (40) are provided which are positioned against two opposite side walls (23, 25) of the receiving support (20).

10. Motor vehicle (1) comprising an assembly (10) for an accumulator battery according to any one of claims 1 to 9.

11. A method of manufacturing an assembly (10) for a storage battery, the method comprising steps of: - provision of a receiving support (20) for a storage battery module (30), said receiving support (20) having, in a bottom part (22), a cooling circuit (27), the bottom part (22) being bordered by at least two side walls (23, 25), - provision of a storage battery module (30) comprising a front wall (34A) bordered by a side wall (34B), said side wall (34B) extending parallel to the side walls (23, 25) of the receiving support (20), the front wall (34A) and the side wall (34B) of the storage battery module (30) delimiting a housing for receiving a plurality of storage cells, said plurality of storage cells being held in the storage battery module (30) by at least one holding element - positioning the accumulator battery module (30) in the receiving support (20) so as to place the plurality of accumulator battery cells in contact with the cooling circuit (27), and - positioning at least one removable wedge (40) between the side walls (23, 25) of the receiving support (20) and the side wall (34B) of the accumulator battery module (30).

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