Battery module comprising a heat treatment plate and method for assembling said module

Abstract

Battery module comprising a heat treatment plate and method for assembling said module. Battery module (1) comprising a housing (2), comprising a plurality of sides (21) and open on at least one side, at least one electrochemical cell (3) and at least one heat treatment plate (4) of said cell configured to close the open side of the housing (2) and comprising a first wall (41) and a second wall (42) connected together and configured to delimit a circuit (C1) for the circulation of a fluid. Abstract figure: Figure 2

Description

Title of the invention: Battery module comprising a heat-treating plate and method for assembling said module

[0001] The present invention relates to an electric battery module comprising at least one heat-treating plate. The invention also relates to a heat-treating plate for such a battery module and to a vehicle comprising such a plate or such a module. Finally, the invention relates to a method for assembling a battery module according to the invention.

[0002] Current electric or hybrid vehicles use increasingly efficient electric battery systems to compete with internal combustion engines. Typically, these battery systems comprise a plurality of modules, each containing electrochemical cells arranged in a casing. Such systems generate significant electrical power, accompanied by substantial heat dissipation, which, if not dissipated, can cause irreversible damage such as a reduction in the system's lifespan or a limitation in its charging rate. To this end, battery systems are conventionally equipped with heat treatment means.

[0003] The heat treatment of electrochemical cells can be implemented using various technologies. In particular, at least one heat treatment plate configured to allow the circulation of a cooling fluid is positioned near the battery device, for example, in contact with a housing wall of at least one module. A drawback of such plates is that they are located outside the module and at least one wall is interposed between the plate and the electrochemical cells, generating high thermal resistance.

[0004] The present invention falls within this context and aims to provide an alternative to battery devices and modules that improve their thermal treatment. The invention also aims to simplify the structure of said devices and modules and to simplify their assembly.

[0005] To this end, the invention proposes a battery module comprising a housing, at least one electrochemical cell, and at least one heat-treatment plate for said cell. The housing comprises a plurality of sides delimiting an internal volume suitable for receiving at least one electrochemical cell and is open on at least one side. The heat-treatment plate is configured to close the open side of the housing and comprises a first wall and a second wall connected to each other and configured to delimit a fluid circulation circuit.

[0006] Furthermore, the battery module may include at least one retaining element inseparable from the first wall and configured to extend into the internal volume so as to maintain at least one electrochemical cell in contact with the first wall within said volume. In particular: - at least one retaining element is attached to the first wall and fixed by gluing, welding and / or brazing; and / or - at least one supporting element and the first wall were made of material.

[0007] In particular, the retaining member can delimit at least one housing at least partly complementary in shape to at least one electrochemical cell configured so as to extend into contact with at least one side of said cell.

[0008] Optionally, the first wall and / or the retaining member may comprise a metallic material. Alternatively or additionally, the first wall may have a thickness of less than 10 mm, for example between 2 and 7 mm.

[0009] In addition, the battery module may include an intermediate heat exchanger configured to extend into the internal volume in contact with at least one electrochemical cell and configured to be fluidly connected to the fluid circuit.

[0010] In particular, the battery module may comprise a plurality of electrochemical cells arranged in contact with the first wall so as to extend into the internal volume.

[0011] According to one embodiment, the battery module further comprises thermal paste disposed on the first wall and / or at least one intermediate heat exchanger.

[0012] Also: - the open side of the housing, closed by the heat treatment plate, can be a lower or upper open side of the housing; and / or - the housing may include a plurality of open sides, including opposite sides, and the module includes a plurality of heat treatment plates, arranged at said open sides.

[0013] The invention also relates to a heat treatment plate for a battery module according to the invention, the heat treatment plate being configured to close the open side of the module's housing and the plate comprising a first wall and a second wall connected to each other and configured to define a fluid circulation circuit. In particular, the heat treatment plate may include at least one retaining element inseparable from the first wall and configured to maintain at least one electrochemical cell in contact with the first wall.

[0014] The invention also relates to an electrically powered motor vehicle or hybrid comprising a battery module and / or a heat treatment plate according to the invention.

[0015] The invention also relates to a method for assembling a battery module according to the invention, comprising: - a positioning step of at least one electrochemical cell on the first wall of the heat treatment plate;

[0016] - a step of positioning the housing on the heat treatment plate of so as to place at least one electrochemical cell in the internal volume and so as to close the casing.

[0017] Other details, features and advantages will become clearer upon reading the detailed description given below, by way of example and not limitation, in relation to the various embodiments illustrated in the following figures:

[0018] Fig. 1 is a schematic representation of an embodiment of a battery module according to the invention comprising a heat treatment plate.

[0019] Fig. 2 is a schematic cross-sectional representation of the battery module.

[0020] Fig. 3 is an exploded schematic representation of the battery module.

[0021] Figure 4 is a schematic representation of an inter-heat exchanger media included in the heat treatment plate.

[0022] Figure 5 is a schematic representation of the inter-heat exchanger media in contact with an electrochemical cell.

[0023] Figure 6 is a schematic representation of an example embodiment of the heat treatment plate for cylindrical electrochemical cells.

[0024] Figure 7 is a schematic representation of an alternative to the illustrated plate. to [Fig.6].

[0025] Figure 8 is a schematic representation of another alternative plate illustrated in [Fig.6].

[0026] Figure 9 is a schematic representation of an example embodiment of the heat treatment plate for prismatic electrochemical cells.

[0027] Figure 10 is a schematic representation of an example embodiment of the heat treatment plate for flexible electrochemical cells.

[0028] Figure 11 is a schematic representation of an alternative plate illustrated in [Fig.9] or 10.

[0029] Figure 12 is a schematic representation of another alternative plate illustrated in [Fig.9] or 10.

[0030] Figures 1 to 3 show an example of an embodiment of an electric battery module 1. Such a battery module 1 may be intended, by way of non-limiting example, for a motor vehicle, in particular a hybrid or electric vehicle. For example, a battery device, or electrical energy storage device equipping the vehicle may include at least one battery module 1 according to the invention or a plurality of said modules 1. According to an alternative not shown, the battery module 1 may be included in a static structure, such as a stationary storage box for battery modules 1, particularly present in storage centers reusing vehicle batteries deemed too degraded.

[0031] In all the figures, the dimensions and spacing between the different components may be exaggerated for clarity. Also, in the description below, the terms "first" and "second" are intended to distinguish the different components or surfaces of the invention and not to establish a hierarchy among them.

[0032] Generally, the battery module 1 comprises a housing 2, at least one electrochemical cell 3, disposed in said housing 2, and at least one heat treatment plate 4 for at least one electrochemical cell 3. "Heat treatment" means a controlled modification of a temperature or heat flow and not a physico-chemical modification of a material.

[0033] At least one electrochemical cell 3 may be prismatic, cylindrical, or flexible, particularly prismatic flexible, also known as pouch, sachet, or pocket type. "Prismatic" means that the electrochemical cell 3 may have a parallelepiped or substantially parallelepiped shape, particularly rectangular or square parallelepiped, or even cubic. Each electrochemical cell 3 is capable of storing energy in chemical form and releasing it as an electric current. The electrochemical cells 3 may, for example, be of the lithium-ion type, also called Li-ion. In the description below, the battery module 1 described comprises at least one electrochemical cell 3. However, as illustrated, it is understood that the battery module 1 may comprise a plurality of electrochemical cells 3, the number and dimensions of said cells being in no way limiting.

[0034] The housing 2 comprises a plurality of sides 21 delimiting an internal volume 22 suitable for receiving at least one electrochemical cell 3. In particular, the housing 2 is open on at least one side, referred to as the open side 23. For example, preferably, the housing 2 is made of a metallic material such as steel and / or aluminum.

[0035] The heat treatment plate 4 is configured to close at least one open side 23 of the housing 2. In other words, the heat treatment plate 4 is configured to cooperate with the sides 21 of the housing 2 so as to close it, and thus close the internal volume 22.

[0036] The attachment of at least one heat treatment plate 4 to the housing 2 is reversible so as to allow the at least one heat treatment plate 4 to be mounted and then removed, in particular so as to access at least one electrochemical cell 3 disposed in the internal volume 22. For example, at least one heat treatment plate 4 and adjacent sides 21 of the housing 2, configured to cooperate with at least one heat treatment plate 4, respectively include fastening members and complementary fastening elements and / or elements configured to cooperate with each other, such as a clip fastening or a screw / nut assembly.

[0037] According to preferred embodiments, the heat treatment plate 4 forms a cover closing an open upper side of the housing 2 and / or a base closing an open lower side 23a of the housing 2.

[0038] According to yet another embodiment, not shown, the housing 2 comprises a plurality of open sides 23, in particular opposite open sides 23 such as an upper open side and a lower open side 23a when the battery module 1 is disposed in the vehicle. The battery module 1 then comprises a plurality of heat-treating plates 4, in particular as many heat-treating plates 4 as there are open sides 23 within the housing 2, each being disposed at one of said open sides 23.

[0039] The heat treatment plate 4 is also configured to delimit a circuit Cl for circulating a fluid Fl, in particular a cooling fluid such as glycol water, a refrigerant, for example R1234yf, or a dielectric fluid. The heat treatment plate 4 comprises a first wall 41 and a second wall 42 connected to each other. The first wall 41 and the second wall 42 extend at least partially at a non-zero distance from each other so as to delimit an intermediate volume 40, located between said walls, suitable for receiving the circuit Cl for circulating the fluid FL. For example, conventionally, a first surface 411 of the first wall 41 and / or a first surface 421 of the second wall 42, facing the intermediate volume 40, define(s) at least partially said circuit Cl, as illustrated in [Fig. 2].

[0040] In a known manner, the heat treatment plate 4 further comprises a fluid inlet 43 Fl, allowing the circuit Cl to be supplied with fluid Fl, and a fluid outlet 44 Fl, allowing the evacuation of said fluid FL. The fluid inlet 43 and outlet 44 Fl can be arranged on the same edge of the heat treatment plate 4, for example delimiting a thickness of said plate, on a separate edge or even in the second wall 42. The circuit Cl thus fluidly connects the inlet 43 and the outlet 44 and can have any known circuit Cl shape, for example in an "i" or in a "U".

[0041] When the heat treatment plate 4 is mounted on the housing 2, the first wall 41, in particular a second surface 412 of the first wall 41 opposite the first surface 411, is turned towards the inner volume 22. The first wall 41 is thus interposed between the intermediate volume 40 and the second wall 42 on the one hand and the interior volume 22 on the other hand.

[0042] The heat treatment plate 4 is configured to extend into contact with at least one electrochemical cell 3. In particular, and advantageously, it extends directly into contact with at least one electrochemical cell 3. Specifically, the heat treatment plate 4 is configured to support and / or hold at least one electrochemical cell 3 within the internal volume 22. It thus has a structural function within the battery module 1, that is, it participates in the positioning of said cell within the module and, in its absence, at least one electrochemical cell 3 cannot be held in position within the module. For example, when the heat treatment plate 4 acts as a base and closes the open lower side 23a, it supports and holds said cell. When the heat treatment plate 4 acts as a lid, it can at least partially hold said cell.

[0043] The battery module 1 thus configured advantageously allows the fluid circulation circuit Cl to be positioned in the direct vicinity of at least one electrochemical cell 3, these being separated only by the first wall 4L. The thermal resistance of the battery module 1 is thus reduced, optimizing the heat exchange implemented between the at least one electrochemical cell 3 and the fluid FL. The battery module 1 according to the invention thus allows better heat treatment of the at least one electrochemical cell 3.

[0044] Optionally, in order to optimize such heat exchange, the first wall 41 is preferably made of a metallic material such as steel or aluminum. Also, additionally or alternatively, the first wall 41 has a thickness, measured between the first surface 411 and the second surface 412, strictly less than 10 mm, for example between 2 and xx 8 or between 2 and 7 mm.

[0045] Optionally, the battery module 1 can be dimensioned so as to maintain at least part of the at least one electrochemical cell 3 in its operating position within the internal volume 22. In particular, as illustrated in [Fig. 2], a height of the housing 2 and / or of the internal volume 22 can optionally be substantially equal to a height of the at least one electrochemical cell 3 such that the latter is in contact with the heat treatment plate 4 on one side and with one of the opposite sides 21 in the housing, or with a separate heat treatment plate, on the other. In this case, the height of the housing 2 is defined between the second surface 412 of the first wall 41 and the nearest surface, facing the internal volume 22, on an opposite side of the housing 2. The at least one cell is thus maintained along a first direction 100, for example parallel to a vertical direction relative to a ground on which the battery module 1 or the vehicle rests. When at least one electrochemical cell 3 is of the cylindrical type, as shown in Figures 6 to 8, the cylindrical shape extends parallel or substantially parallel to the first direction 100, and the height of said cell is defined along this same direction. A similar principle applies, mutatis mutandis, to prismatic or flexible prismatic cells, respectively illustrated in Figures 9 and 10, arranged in the internal volume.

[0046] Optionally, the battery module 1 may include a conventional retaining armature, not shown, configured to hold at least one electrochemical cell 3 in the operating position within the internal volume 22, for example a comb in the case of flexible prismatic electrochemical cells 3.

[0047] In order to further optimize the heat exchange implemented, the heat treatment plate 4 optionally includes at least one intermediate heat exchanger 45 configured to extend into the internal volume 22 in contact with at least one electrochemical cell 3. The intermediate heat exchanger 45 is included within the heat treatment plate 4 and fluidly connected to the circuit CL. In particular, it is included within the first wall 41 and may extend outwards by at least a portion of the second surface 412. It may have a hollow structure or include at least one conduit 46 configured to receive at least a portion of the fluid Fl circulating in the circuit CL and then return said fluid Fl to the circuit CL

[0048] Preferably, as illustrated in [Fig. 4] or 5, the intermediate heat exchanger 45 and the first wall 41 may be made of a single material, i.e., they cannot be separated from each other without resulting in the degradation, or even destruction, of the heat treatment plate 4. According to an alternative not shown, the intermediate heat exchanger 45 is attached and fixed to the first wall 41, at the level of the second surface 412. For example, the intermediate heat exchanger 45 is bonded, welded, brazed, or fixed by any known fastening means. Optionally, the battery module 1 then includes at least one sealing element disposed at the interfaces connecting at least one pipe 46 to the circuit CL

[0049] The intermediate heat exchanger 45 can extend over all or part of the height of the internal volume 22 defined along the first direction 100. Additionally, the intermediate heat exchanger 45 can extend over all or part of a second direction 200, orthogonal to the first direction 100 and corresponding here to a width of the casing 2, and / or over all or part of a third direction 300, orthogonal to the first and second directions, corresponding here to a length of the casing 2.

[0050] According to a preferred embodiment, when at least one electrochemical cell 3 is of the flexible prismatic type, the intermediate heat exchanger 45 is configured to extend into contact with a connector 31 and / or a terrace of said cell, as illustrated in [Fig. 5]. Indeed, conventionally, a flexible prismatic electrochemical cell 3 comprises a main portion 32 having a stack, not shown, of a plurality of electrodes arranged in a flexible strip. An end portion of the main portion 32 forms the terrace, that is to say, an extension of the main portion 32 without the electrode stack and bearing at least one connector 31, or electrical terminal, connected to the electrodes. The electrochemical cell 3 may comprise a single end portion, bearing several connectors 31, or a plurality of end portions, bearing at least one connector 31.Classically, the connectors 31 are the areas most impacted by the significant heating taking place within the electrochemical cells 3, the presence of an intermediate heat exchanger 45 according to the invention therefore advantageously improves the durability of the battery module 1 by thermally treating said connectors 311. .

[0051] Optionally, the battery module 1 may further include at least one retaining element 6 inseparable from the first wall 41. The at least one retaining element 6 is configured to extend into the internal volume 22 so as to maintain the at least one electrochemical cell 3 in contact with the first wall 41. In other words, the at least one retaining element 6 is configured to maintain the at least one electrochemical cell 3 in the operating position within the internal volume 22. In the following description, reference is made to a single retaining element 6; however, it is understood that the invention can be extended to a plurality of retaining elements 6.

[0052] At least one retaining member 6 allows for the definition of all or part of at least one housing 7 configured to receive at least one electrochemical cell 3 and of which a bottom is formed by the first wall 4L. Such a housing 7 is defined by the retaining member 6 alone or by the retaining member 6 in combination with one or more of the side(s) of the housing 2 and / or with at least one intermediate heat exchanger 45 as previously described. Also, said housing 7 is configured to receive one or more electrochemical cells 3. Optionally, the retaining member 6 delimits all or part of a plurality of housings 7. The retaining member 6 is thus configured to be in contact with at least one side of at least one electrochemical cell 3. The housing 7 is at least partially complementary in shape to at least one electrochemical cell 3. In particular, as illustrated in [Fig.6], 7 or 8, the retaining member 6 may include one or more housings 7 of circular or curved shape, for example in the form of an arc of a circle, when at least one electrochemical cell 3 is cylindrical. Similarly, the retaining member 6 may include one or more housings 7 of prismatic shape. when at least one electrochemical cell 3 is prismatic or flexible prismatic. The retaining element is then, for example, a groove or a rib. For example, said housings 7 extend perpendicularly to a stacking direction 400 of the plurality of electrochemical cells 3 as illustrated in Figures 9 to 12.

[0053] Preferably, the retaining member 6 extends over a portion of the direction orthogonal to the first wall 41 and / or the second wall 42. Alternatively or additionally, the retaining member 6 extends over a portion of the dimension of at least one electrochemical cell 3 defined along this same direction orthogonal to the first wall 41 and / or the second wall 42. When the heat treatment plate 4 closes the open lower side 23a or the open upper side of the housing, the retaining member 6 extends over a portion of the height of the internal volume 22 and / or over a portion of the height of at least one electrochemical cell 3.Preferably, the retaining element 6 has a dimension less than or equal to one-third, or even one-quarter, for example, on the order of one-fifth, of the dimension of the at least one electrochemical cell 3 defined along the direction orthogonal to the first wall 41 and / or the second wall 42. For example, preferably, the retaining element 6 has a height on the order of one-fifth of the height of the at least one electrochemical cell 3. In this case, the dimension considered is the height. Such a principle advantageously limits the interaction between the retaining element 6 and the at least one electrochemical cell 3 to extreme zones, defined along the aforementioned direction and dimension, and not to a central zone of said cell. The battery module 1 according to the invention is thus adapted to ensure the retention of the at least one electrochemical cell 3 throughout its lifetime, even in the event of swelling.Indeed, in the case of flexible prismatic electrochemical cells, swelling of the central area can classically be observed with aging and wear.

[0054] As previously explained, the at least one retaining member 6 is inseparable from the heat treatment plate 4. "Inseparable" means that the at least one retaining member 6 cannot be separated from the first wall 41 without resulting in damage to the heat treatment plate 4. According to a first, preferred embodiment, the at least one retaining member 6 and the first wall 41 are made of a single piece of material. Alternatively or additionally, according to a second embodiment, the at least one retaining member 6 is attached to the first wall 41 and fixed by bonding, welding, and / or brazing to the first wall 41, in particular to the second surface 412. The at least one retaining member 6 then extends beyond the first wall 41 and ensures the retention of the at least one electro-cell chemical 3 within the internal volume 22, in particular so as to maintain at least one of the sides of the electrochemical cell 3 in contact with the second surface 412.

[0055] Regardless of the embodiment implemented, the retaining member 6 is preferably made of a metallic material, such as steel or aluminum, or at least of a plastic or composite material.

[0056] Optionally, the battery module 1 may also include thermal paste. This may be disposed on the first wall 41, particularly on all or part of the second surface 412 and / or on at least one intermediate heat exchanger 45.

[0057] The invention thus makes it possible to ensure the holding and heat treatment of at least one electrochemical cell 3 by means of the heat treatment plate 4. As previously stated, the invention also extends to a battery module 1 comprising a plurality of electrochemical cells 3. When the electrochemical cells 3 are of the cylindrical type, they can, for example, be arranged in a staggered pattern in the internal volume 20. When the plate includes one or more holding element(s), the positioning of the electrochemical cells can be at least partly defined by the shape and / or arrangement of one or more housing(s) 7, one or more electrochemical cell(s) 3 extending into each housing 7 considered.When the electrochemical cells 3 are of the prismatic or flexible prismatic type, they are stacked along a stacking direction 400, for example parallel to the second direction 200 or the third direction 300. When the plate includes one or more retaining elements, these extend along a direction orthogonal to the stacking direction 400 and the same applies to the different housings 7. Optionally, a plurality of prismatic or flexible prismatic electrochemical cells 3 may be arranged in the same housing 7.

[0058] The invention also extends to a heat treatment plate 4 intended for a battery module 1 as described above. It is understood that all the characteristics described above also apply to said plate.

[0059] The invention further extends to a method for assembling the battery module 1 according to the invention. Generally, such a method includes a step of positioning at least one electrochemical cell 3 on the heat treatment plate 4. In particular, this is arranged in contact with the second surface 412 of the first wall 4L. A similar principle is implemented when the battery module 1 comprises a plurality of electrochemical cells 3.

[0060] When the heat treatment plate 4 includes an intermediate heat exchanger 45, at least one electrochemical cell 3 or at least one of the electrochemical cells 3 is disposed in contact with said exchanger, as described above.

[0061] Similarly, when the processing plate includes at least one retaining element 6, at least one electrochemical cell 3 is disposed in the housing 7, at least partially delimited by it, or in one of the housings 7 delimited by it. At least one electrochemical cell 3 is then in contact with the first wall 41 and the retaining element 6. The same applies when the battery module 1 includes a plurality of electrochemical cells 3, these being disposed in separate or identical housings 7, delimited by one or more retaining elements, as described above.

[0062] Optionally, the process includes, prior to the positioning step of at least one electrochemical cell 3 on the heat treatment plate 4, a step of applying a thermal paste to all or part of the first wall 41.

[0063] The method then includes a step of positioning the housing 2 on the heat treatment plate 4 so as to dispose of at least one electrochemical cell 3 in the internal volume 22 and so as to close the housing 2. A part of the sides 21 of the housing 2 then cooperates with the heat treatment plate 4 so as to close the housing 2. The housing 2 can then be fixed to the plate, and vice versa, by means of the fixing members and fixing elements described above.

[0064] To disassemble the battery module 1, for example in order to replace at least one electrochemical cell 3 or one of the electrochemical cells 3, the reverse process is carried out.

[0065] The heat treatment plate thus has a structural function for the battery module 1. It allows at least one electrochemical cell 3 to be supported and / or maintained in its operating position. Consequently, if the heat treatment plate 4 is removed and the battery module 1 does not include at least one other plate, at least one cell is no longer held in a position suitable for its operation within the internal volume 22.

[0066] The present invention thus proposes a battery module comprising a structural heat-treated plate adapted to implement heat exchange, advantageously simplifying the battery module by reducing the number of required components, thereby reducing the module's mass and cost, and optimizing the heat exchange between the plate and at least one electrochemical cell by placing them in direct contact. The invention also ensures the battery module's durability by thermally treating the areas most typically affected by heating and by adapting to the evolution of the electrochemical cells 3 as they wear out, particularly their swelling. The module's assembly and disassembly are also simplified, as the electrochemical cells are positioned directly on the heat-treated plate.

[0067] The present invention cannot, however, be limited to the means and configurations described and illustrated herein and it also extends to any equivalent means or configuration and to any technically operative combination of such means insofar as they ultimately fulfill the functionalities described and illustrated in this document.

Claims

Demands

1. Battery module (1) comprising a housing (2), at least one electrochemical cell (3) and at least one heat treatment plate (4) for said cell: - the housing (2) comprising a plurality of sides (21) delimiting an internal volume (22) receiving the at least one electrochemical cell (3) and is open on at least one side; - the heat treatment plate (4) closing the open side of the housing (2) and comprising a first wall (41) and a second wall (42) connected together and configured to delimit a circuit (Cl) for the circulation of a fluid (Fl);and characterized in that the heat treatment plate comprises an intermediate heat exchanger (45) extending into the internal volume (22) in contact with at least one electrochemical cell (3) and configured to be fluidly connected to the circuit (Cl) of fluid (Fl), the intermediate heat exchanger (45) and the first wall (41) being made of material or the intermediate heat exchanger (45) being attached and fixed to the first wall (41) of the heat treatment plate (4).

2. Battery module (1) according to the preceding claim, further comprising at least one retaining member (6) inseparable from the first wall (41) extending into the inner volume (22) so as to maintain at least one electrochemical cell (3) in contact with the first wall (41) within said volume.

3. Battery module (1) according to the preceding claim, wherein: - at least one retaining member (6) is attached to the first wall (41) and fixed by gluing, welding and / or brazing; and / or - at least one retaining member (6) and the first wall (41) are made of material.

4. Battery module (1) according to any one of claims 2 or 3, wherein the retaining member (6) delimits at least one housing (7) at least in part complementary in shape to at least one electrochemical cell (3) extending in contact with at least one flank of said cell.

5. Battery module (1) according to any one of the preceding claims, comprising a plurality of electrochemical cells (3) arranged in contact with the first wall (41) so as to extend into the internal volume (22).

6. Battery module (1) according to any one of the preceding claims, wherein: - the open side of the housing (2), closed by the heat treatment plate (4), is a lower or upper open side of the housing (2); and / or - the housing (2) comprises a plurality of open sides, in particular opposite sides, and the module comprises a plurality of heat treatment plates (4), arranged at said open sides.

7. Heat treatment plate (4) for a battery module (1) according to any one of the preceding claims, the heat treatment plate (4) being configured to close the open side of the housing (2) of said module and the heat treatment plate (4) comprising a first wall (41) and a second wall (42) connected together and configured to delimit a circuit (Cl) for the circulation of a fluid (Fl) characterized in that the heat treatment plate comprises an intermediate heat exchanger (45) configured to extend into the internal volume (22) in contact with at least one electrochemical cell (3) and configured to be fluidly connected to the circuit (Cl) of fluid (Fl), the intermediate heat exchanger (45) and the first wall (41) being made of material or the intermediate heat exchanger (45) being attached and fixed to the first wall (41) of the heat treatment plate (4).

8. Electric or hybrid motor vehicle comprising a battery module (1) according to any one of claims 1 to 6 and / or a heat treatment plate (4) according to claim 7.

9. Method of assembling a battery module (1) according to any one of claims 1 to 6 comprising: - a step of positioning at least one electrochemical cell (3) on the first wall (41) of the heat treatment plate (4); - a step of positioning the housing (2) on the heat treatment plate (4) so ​​as to dispose of at least one electrochemical cell (3) in the internal volume (22) and so as to close the housing (2).

Images