Electrochemical assembly comprising a cover for holding electrochemical elements

Abstract

Electrochemical assembly comprising a cover for holding electrochemical elements The present invention relates to an electrochemical assembly (10) comprising: - electrochemical elements (14); - longitudinal walls (20, 22) arranged on either side of the electrochemical elements (14); - transverse walls (30, 32); - a cover (50); the electrochemical elements (14) being held in position in a longitudinal direction (X) by the longitudinal walls (20, 22) and in a transverse direction (Y) by the transverse walls (30, 32), the cover (50) being made in a single piece, blocking the movement of the electrochemical elements (14) in an elevation direction (Z) in one direction, and comprising: - a main wall (52) comprising an internal surface (54) in direct contact with the electrochemical elements (14) and an external surface (56); and - ribs (60) extending from the outer surface (56). Figure for abstract: Figure 2

Description

Title of the invention: Electrochemical assembly comprising a cover for holding electrochemical elements

[0001] The present invention relates to an electrochemical assembly comprising:

[0002] - a plurality of electrochemical elements arranged one after the other according to a longitudinal direction;

[0003] - a first and a second longitudinal wall arranged on either side of the plurality of electrochemical elements in the longitudinal direction;

[0004] - a first and a second transverse wall, the first transverse wall connecting a first lateral edge of the first longitudinal wall and a first lateral edge of the second longitudinal wall, the second transverse wall connecting a second lateral edge of the first longitudinal wall and a second lateral edge of the second longitudinal wall;

[0005] - a hood;

[0006] the plurality of electrochemical elements being arranged in a receiving space delimited by the longitudinal walls, the transverse walls and the cover.

[0007] Such an electrochemical assembly further comprises specific members intended to maintain the electrochemical elements in position in each of the longitudinal, transverse and elevation directions.

[0008] In particular, such an electrochemical assembly comprises specific members intended to prevent the movement of the electrochemical elements in the elevation direction.

[0009] However, the use of these specific organs complicates the electrochemical assembly, increases its mass and makes the assembly of the assembly more difficult.

[0010] An aim of the invention is then to propose an electrochemical assembly in which the electrochemical elements are held in position while making the electrochemical assembly simpler and lighter.

[0011] To this end, the invention relates to an electrochemical assembly comprising:

[0012] - a plurality of electrochemical elements arranged one after the other according to a longitudinal direction;

[0013] - a first and a second longitudinal wall extending substantially perpendicular to the longitudinal direction and substantially parallel to a median frontal plane defined by a transverse direction and an elevation direction perpendicular to the longitudinal direction, the first and second longitudinal walls being arranged on either side of the plurality of electrochemical elements in the longitudinal direction;

[0014] - a first and a second transverse walls extending substantially parallel to a median sagittal plane defined by the longitudinal direction and the elevation direction, the first transverse wall connecting a first lateral edge of the first longitudinal wall and a first lateral edge of the second longitudinal wall, the second transverse wall connecting a second lateral edge of the first longitudinal wall and a second lateral edge of the second longitudinal wall;

[0015] - a hood extending substantially parallel to a horizontal plane defined by the longitudinal direction and transverse direction;

[0016] the plurality of electrochemical elements being held in position in the longitudinal direction by the first and second longitudinal walls and in the transverse direction by the first and second transverse walls,

[0017] the cover being made in a single piece and blocking the movement of the plurality of electrochemical elements in the direction of elevation in one direction,

[0018] the hood comprising:

[0019] - a main wall extending substantially parallel to the horizontal plane, comprising an inner surface in direct contact with the plurality of electrochemical elements and an outer surface opposite the inner surface; and

[0020] - a plurality of ribs extending from the outer surface of the main wall, substantially parallel to the median sagittal plane.

[0021] The fact that the cover is made in a single piece greatly simplifies the electrochemical assembly and makes it easier to assemble the electrochemical assembly. In addition, the cover blocks the movement of the plurality of electrochemical elements in the elevation direction in one direction by direct contact between the internal surface of the main wall of the cover and the plurality of electrochemical elements, which makes it possible to avoid having to resort to specific holding members. Also, the plurality of ribs of the cover makes it possible to improve the inertia under bending of the cover when the cover is stressed in the elevation direction. Thus, the holding of the plurality of electrochemical elements in the elevation direction is improved.

[0022] According to other advantageous aspects of the invention, the electrochemical assembly comprises one or more of the following characteristics, taken in isolation or in all technically possible combinations:

[0023] - the hood is mounted on the first and second longitudinal walls;

[0024] - the hood comprises a first and a second external transverse walls extending from the outer surface of the main wall of the cover, the first outer transverse wall of the cover extending in the extension of the first transverse wall of the electrochemical assembly, the second outer transverse wall of the cover extending in the extension of the second transverse wall of the electrochemical assembly;

[0025] - the hood further comprises a first internal transverse wall extending from the outer surface of the main wall of the hood substantially parallel to the first outer transverse wall of the hood and a second inner transverse wall extending from the outer surface of the main wall of the hood substantially parallel to the second outer transverse wall of the hood,

[0026] the first external transverse wall and the first internal transverse wall of the cover delimiting a first space for receiving at least a first interconnection bar and / or first sensors of the electrochemical assembly, the second external transverse wall and the second internal transverse wall of the cover delimiting a second space for receiving at least a second interconnection bar and / or second sensors of the electrochemical assembly;

[0027] - the external transverse walls of the hood comprise a plurality of lugs capable of maintain the corresponding interconnection bar and / or the corresponding sensors in the corresponding receiving space;

[0028] - the external transverse walls of the hood each comprise at least one breakable portion at a longitudinal end of said external transverse wall, said at least one breakable portion being capable of being cut to form a passage, said at least one breakable portion being delimited by at least one pre-cutout made in said external transverse wall;

[0029] - at least two ribs of the plurality of ribs are separated by a space of wiring for receiving electrical cables of the electrochemical assembly, at least one electrical cable of the electrochemical assembly extending into the wiring space;

[0030] - the ribs of the plurality of ribs comprise a plurality of lugs capable to maintain electrical cables of the electrochemical assembly in the corresponding wiring space;

[0031] - the ribs of the plurality of ribs comprise openings forming wiring passages for electrical cables of the electrochemical assembly, at least one electrical cable of the electrochemical assembly extending in a wiring passage;

[0032] - the hood is made of composite material, for example a composite material comprising plastic and fibers;

[0033] - the electrochemical elements are of the prismatic type;

[0034] - each of the transverse walls of the electrochemical assembly comprises a main portion extending substantially parallel to the median sagittal plane and an auxiliary portion,

[0035] the auxiliary portion comprising a horizontal part extending from a lower edge of the main portion in the direction of the median sagittal plane substantially parallel to the horizontal plane,

[0036] the plurality of electrochemical elements resting on the horizontal parts of the auxiliary portions of the transverse walls of the electrochemical assembly;

[0037] - the auxiliary portion comprises vertical parts extending from ends longitudinal of the horizontal part, the plurality of electrochemical elements being supported on the vertical parts of the auxiliary portions of the transverse walls of the electrochemical assembly;

[0038] - the electrochemical assembly comprises a layer of thermally conductive material conductor applied under the plurality of electrochemical elements between the auxiliary portions of the transverse walls of the electrochemical assembly;

[0039] - the thickness of the layer of thermally conductive material is substantially equal to the thickness of the horizontal parts of the auxiliary portions of the transverse walls of the electrochemical assembly.

[0040] The invention further relates to a battery comprising at least one electrochemical assembly as described above.

[0041] The invention will appear more clearly on reading the description which follows, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0042] [Fig-1] - [Fig.l] is a simplified schematic illustration of a battery according to the invention;

[0043] [Fig.2] - [Fig.2] is a simplified schematic perspective illustration of the battery of [Fig.l];

[0044] [Fig.3] - [Fig.3] is a simplified schematic illustration in sectional view of the electrochemical assembly of [Fig.2], according to a section plane III-III;

[0045] [Fig.4] - [Fig.4] is a simplified schematic illustration in sectional view of the electrochemical assembly of [Fig.2], according to a section plane IV-IV; and

[0046] [Fig.5] - [Fig.5] is a simplified schematic illustration in side view of the electrochemical assembly of [Fig.2], the corresponding viewpoint facing a longitudinal wall of the electrochemical assembly.

[0047] With reference to Figures 1 to 5, a battery 1 according to the invention is described.

[0048] The battery 1 comprises at least one electrochemical assembly 10, for example two electrochemical assemblies 10 as illustrated in the example of [Fig.l].

[0049] With reference to figures 2 to 5, the electrochemical assembly 10 comprises a plurality of electrochemical elements 14, a first longitudinal wall 20, a second longitudinal wall 22, a first transverse wall 30, a second transverse wall 32 and a cover 50.

[0050] Advantageously, with reference to [Fig.2], the electrochemical assembly 10 further comprises at least one first interconnection bar 90, at least one second interconnection bar 92, first sensors 94 and second sensors (not visible).

[0051] Still advantageously, the electrochemical assembly 10 further comprises electrical cables 98.

[0052] Still advantageously, with reference to figures 4 and 5, the electrochemical assembly 10 further comprises a layer of thermally conductive material 100.

[0053] By "electrochemical element" is meant in particular an assembly of electrodes, electrolyte, container, terminals and generally separators, which is a source of electrical energy obtained by direct transformation of chemical energy.

[0054] With reference to [Fig. 3], the electrochemical elements 14 are arranged one after the other in a longitudinal direction X.

[0055] Advantageously, the electrochemical elements 14 are of the prismatic type. For example, the electrochemical elements 14 are of the rechargeable type, for example Li-Ion.

[0056] In particular, the electrochemical elements 14 each comprise an external envelope 16 or container having substantially the shape of a rectangular parallelepiped. In particular, as illustrated in [Fig. 3], the electrochemical elements 14 are arranged against each other so that the large faces of the corresponding rectangular parallelepipeds are substantially perpendicular to the longitudinal direction X and that said large faces are applied against each other. By "large face" is meant one of the two faces of the rectangular parallelepiped whose surface area is greater than that of the other faces of the rectangular parallelepiped.

[0057] As will be described in more detail below, the plurality of electrochemical elements 14 is held in position in the longitudinal direction X by the first and second longitudinal walls 20, 22, in a transverse direction Y by the first and second transverse walls 30, 32 and in the elevation direction Z by the cover 50 and the transverse walls 30, 32.

[0058] In particular, as detailed below, the plurality of electrochemical elements 14 rests on horizontal parts 42 of auxiliary portions 40 of the transverse walls 30, 32. Furthermore, the plurality of electrochemical elements advantageously rests on vertical parts 46 of the auxiliary portions 40 of the transverse walls 30, 32.

[0059] With reference to Figures 2, 3 and 5, the first and second longitudinal walls 20, 22 extend substantially perpendicular to the longitudinal direction X and substantially parallel to a median frontal plane PFM defined by the transverse direction Y and an elevation direction Z perpendicular to the longitudinal direction X.

[0060] The first and second longitudinal walls 20, 22 are arranged on either side of the plurality of electrochemical elements 14 in the longitudinal direction X.

[0061] In particular, the first and second longitudinal walls 20, 22 are in direct contact with the plurality of electrochemical elements 14, in particular with the electrochemical elements 14 of the longitudinal ends.

[0062] With reference to Figures 2 and 5, the first and second longitudinal walls 20, 22 each extend in the transverse direction Y between a first lateral edge 24 and a second lateral edge 26.

[0063] With reference to the example of [Fig.3], the first and second longitudinal walls 20, 22 are hollow.

[0064] For example, the first and second longitudinal walls 20, 22 are made of aluminum, stainless steel or composite material.

[0065] With reference to Figures 2, 4 and 5, the first and second transverse walls 30, 32 extend substantially parallel to a median sagittal plane PSM defined by the longitudinal direction X and the elevation direction Z.

[0066] The first transverse wall 30 connects the first lateral edge 24 of the first longitudinal wall 20 and the first lateral edge of the second longitudinal wall 22.

[0067] In particular, the first transverse wall 30 is fixed to the first lateral edge 24 of the first longitudinal wall 20 and to the first lateral edge of the second longitudinal wall 22, in particular by welding.

[0068] The second transverse wall 32 connects the second lateral edge 26 of the first longitudinal wall 20 and the second lateral edge of the second longitudinal wall 22.

[0069] In particular, the second transverse wall 32 is fixed to the second lateral edge 26 of the first longitudinal wall 20 and to the second lateral edge of the second longitudinal wall 22, in particular by welding.

[0070] The first and second transverse walls 30, 32 are arranged on either side of the plurality of electrochemical elements 14 in the transverse direction Y.

[0071] In particular, the first and second transverse walls 30, 32 are in direct contact with all of the electrochemical elements of the plurality of electrochemical elements 14.

[0072] The first and second transverse walls 30, 32 make it possible to maintain the plurality of electrochemical elements 14 in position along the transverse direction Y. Furthermore, the fixing of the transverse walls 30, 32 on the longitudinal walls 20, 22 makes it possible to maintain the plurality of electrochemical elements 14 in position along the longitudinal direction X. The transverse walls 30, 32 work in particular in traction to maintain the longitudinal walls 20, 22 in position in the longitudinal direction X, which makes it possible to maintain the electrochemical elements 14 in position in the longitudinal direction X.

[0073] With reference to Figures 2 to 5, each of the transverse walls 30, 32 comprises for example a main portion 34 and an auxiliary portion 40.

[0074] The main portion 34 extends substantially parallel to the median sagittal plane PSM, between an upper edge 36 facing the cover 50 and a lower edge 38 opposite the upper edge 36.

[0075] The auxiliary portion 40 comprises a horizontal part 42 and vertical parts 46.

[0076] The horizontal part 42 extends from the lower edge 38 of the main portion 34 in the direction of the median sagittal plane PSM and substantially parallel to a horizontal plane PH defined by the longitudinal X and transverse Y directions.

[0077] Advantageously, as illustrated in [Fig. 3], the horizontal part 42 further extends between two longitudinal ends 44, the longitudinal ends 44 being arranged on either side of the plurality of electrochemical elements 14.

[0078] With reference to Figures 2, 3 and 5, the vertical portions 46 extend from the longitudinal ends 44 of the horizontal portion 42.

[0079] With reference to the example of [Fig.4], the first and second transverse walls 30, 32 are solid.

[0080] For example, the first and second transverse walls 30, 32 are each in a single piece.

[0081] In particular, the first and second transverse walls 30, 32 each comprise a plate at least partially forming the main portion 34 and forming the auxiliary portion 40, in particular the horizontal portion 42 and the vertical portions 46 of the auxiliary portion 40.

[0082] Advantageously, the vertical parts 46 of the auxiliary portion 40 are ribs extending to the longitudinal ends 44 of the horizontal part 42 in the direction of the cover 50.

[0083] For example, the first and second transverse walls 30, 32 are made of aluminum, stainless steel or composite material.

[0084] The cover 50 extends substantially parallel to the horizontal plane PH.

[0085] The cover 50 blocks the movement of the plurality of electrochemical elements in the elevation direction Z in one direction.

[0086] For example, the cover 50 is mounted on the first and second longitudinal walls 20, 22. In particular, the cover 50 is indexed and screwed onto the first and second longitudinal walls 20, 22 with a structure for accommodating the electrochemical assembly.

[0087] The hood 50 comprises a main wall 52 and a plurality of ribs 60.

[0088] Advantageously, the cover 50 further comprises first and second external transverse walls 74, 76.

[0089] Still advantageously, the cover 50 further comprises first and second internal transverse walls 80, 84.

[0090] The cover 50 is made in a single piece.

[0091] Advantageously, the cover 50 is made of a composite material, for example a composite material comprising a plastic, in particular a thermoplastic or a thermoset, and fibers. According to a particular example, the composite material is polyamide 66 filled with fibers, in particular glass fibers, preferably polyamide 66 filled with at least 15% glass fibers by mass. Alternatively, the cover 50 is made of a plastic material, in particular a thermoplastic or a thermoset without the addition of fibers.

[0092] In particular, the composite material has a modulus of elasticity greater than or equal to 3,300 MPa, a breaking stress greater than or equal to 80 MPa and a strain at break greater than or equal to 13% (measured according to standard ISO 527-1 / -2.

[0093] In particular, the composite material or the plastic material in the variant where the cover 50 is made of a plastic material, has a transverse electrical resistivity of between IxlO6 ohm.m and IxlO13 ohm.m. For example, the composite material or the plastic material in the variant where the cover 50 is made of a plastic material, has a dielectric strength greater than or equal to 34 kV / mm, in particular of between 34 kV / mm and 40 kV / mm. Thus, the electrical insulation provided by the cover 50 is improved.

[0094] The main wall 52 extends substantially parallel to the horizontal plane PH

[0095] As illustrated in Figures 3 and 4, the main wall 52 comprises an internal surface 54 in direct contact with the plurality of electrochemical elements 14 and an external surface 56 opposite the internal surface 54.

[0096] The main wall 52 extends between two longitudinal edges 53 in the longitudinal direction X and between two lateral edges 55 in the transverse direction Y.

[0097] The main wall 52 has a length LC measured in the longitudinal direction X between the two longitudinal edges 53, for example between 122 mm and 610 mm.

[0098] Advantageously, the length LC corresponds to that of 4 to 20 electrochemical elements 14 arranged one after the other.

[0099] The main wall 52 has a width WC measured in the transverse direction Y between the two lateral edges 55, between 155 mm and 310 mm.

[0100] Advantageously, the width WC corresponds to that of 1 to 2 rows of electrochemical elements 14.

[0101] The plurality of ribs 60 extends from the outer surface of the main wall 52 of the cover 50, substantially parallel to the median sagittal plane PSM.

[0102] For example, the ribs 60 each extend over a length LA in the longitudinal direction X between 70% and 95% of the length LC of the main wall 52 of the cover 50.

[0103] In particular, the ribs 60 each have a thickness TA measured in the transverse direction Y, for example between 1 mm and 3 mm, preferably substantially equal to 2 mm.

[0104] In particular, the ribs 60 each have a height HA measured in the elevation direction Z from the external surface 56 of the main wall 52 of the cover 50 of between 10 mm and 20 mm.

[0105] Advantageously, with reference to Figures 2, 4 and 5, at least two ribs 60 of the plurality of ribs 60 are separated by a wiring space 62 intended to receive electrical cables 98.

[0106] Still advantageously, with reference to [Fig.4], the ribs 60 comprise a plurality of lugs 64 capable of holding the electrical cables 98 in the corresponding wiring space 62.

[0107] Still advantageously, with reference to [Fig.2], the ribs 60 comprise openings 66 forming wiring passages for the electrical cables 98.

[0108] With reference to the example of figures 2, 4 and 5, a first group 68 of ribs 60 and a second group 70 of ribs 60 are arranged symmetrically on either side of the median sagittal plane PSM.

[0109] For example, the first group 68 of ribs 60 is arranged between the first internal transverse wall 80 of the cover 50 and the median sagittal plane PSM and the second group 70 of ribs 60 is arranged between the second internal transverse wall 84 of the cover 50 and the median sagittal plane PSM.

[0110] In particular, the first and second groups 68, 70 each comprise at least two ribs 60, in particular exactly two ribs.

[0111] For example, the at least two ribs 60 of each group 68, 70 are separated by a distance SA measured in the transverse direction Y of between 6 mm and 9 mm, for example substantially equal to 7 mm.

[0112] The first and second external transverse walls 74, 76 of the cover 50 extend from the external surface 56 of the main wall 52 of the cover 50.

[0113] Advantageously, as illustrated in Figures 2, 4 and 5, the first external transverse wall 74 of the cover 50 extends in the extension of the first transverse wall 30 of the electrochemical assembly 10 and the second external transverse wall 76 of the cover 50 extends in the extension of the second transverse wall 32 of the electrochemical assembly 10.

[0114] Advantageously, with reference to [Fig. 2], the external transverse walls 74, 76 of the cover 50 comprise a plurality of lugs 77 capable of holding the at least one corresponding interconnection bar 90, 92 and / or the corresponding first / second sensors 94 in a corresponding receiving space 82, 86. In particular, the plurality of lugs 77 are capable of holding members 95 for taking measurements of the first sensors 94 and / or second sensors.

[0115] Still advantageously, still with reference to [Fig. 2], the external transverse walls 74, 76 of the cover 50 each comprise at least one breakable portion 78 at a longitudinal end of said external transverse wall 74, 76. For example, each external transverse wall 74, 76 comprises two breakable portions 78 at respectively each of the longitudinal ends of said external transverse wall 74, 76.

[0116] In particular, the at least one breakable portion 78 is capable of being cut to form a passage intended in particular for the passage of electric cables 98. In particular, the at least one breakable portion 78 is delimited by at least one pre-cut 79 made in said external transverse wall 74, 76.

[0117] The first internal transverse wall 80 of the cover 50 extends from the external surface 56 of the main wall 52 of the cover 50 substantially parallel to the first external transverse wall 74 of the cover 50.

[0118] The first internal transverse wall 80 and the first external transverse wall 74 of the cover 50 delimit between them a first space 82 for receiving at least one first interconnection bar 90 and / or first sensors 94 of the electrochemical assembly 10. In particular, the first space 82 is a space for receiving the measurement-taking members 95 of the first sensors 94.

[0119] For example, with reference to [Fig.2], the first internal transverse wall 80 of the cover 50 comprises a plurality of lugs 81 capable of holding the at least one first interconnection bar 90 in the first receiving space 82.

[0120] The second internal transverse wall 84 of the cover 50 extends from the external surface 56 of the main wall 52 of the cover 50 substantially parallel to the second external transverse wall 76 of the cover 50.

[0121] The second internal transverse wall 84 and the second external transverse wall 76 of the cover 50 delimit between them a second space 86 for receiving at least one second interconnection bar 92 and / or second sensors of the assembly. electrochemical 10. In particular, the second space 86 is a space for receiving the measuring members of the second sensors.

[0122] For example, the second internal transverse wall 84 of the cover 50 comprises a plurality of lugs capable of holding the at least one second interconnection bar 92 in the second receiving space 86.

[0123] The at least one first interconnection bar 90 is electrically connected to a plurality of electrochemical elements 14, in particular to terminals of a first polarity of the electrochemical elements 14. The at least one first interconnection bar is in particular held in the first receiving space 82 by the corresponding lugs 77 and 81.

[0124] The at least one second interconnection bar 92 is electrically connected to a plurality of electrochemical elements 14, in particular to terminals of a second polarity opposite to the first polarity, of the electrochemical elements 14. The at least one second interconnection bar is in particular held in the second receiving space 86 by the corresponding lugs 77, 81.

[0125] The first sensors 94 are configured to measure parameters relating to the electrochemical elements 14, in particular a voltage at the terminals of the electrochemical elements 14 or a temperature of the electrochemical elements, in particular by the measurement members 95. The first sensors 94 are in particular mounted on the at least one first interconnection bar 90 in the first receiving space 82.

[0126] The second sensors are configured to measure parameters relating to the electrochemical elements 14, in particular a voltage across the terminals of the electrochemical elements or a temperature of the electrochemical elements 14, in particular by the measuring members. The second sensors are in particular mounted on the at least one second interconnection bar 92 in the second receiving space 86.

[0127] The electrical cables 98 are intended to connect the sensors 94 to a battery management system (not shown) and / or to connect the interconnection bars 90, 92 to electrical connectors (not shown).

[0128] For example, with reference to [Fig.2], at least one electrical cable 98 extends into a wiring space 62.

[0129] For example, at least one electrical cable 98 extends into a wiring passage of an opening 66 of rib 60.

[0130] The layer 100 of thermally conductive material is applied under the plurality of electrochemical elements 14.

[0131] In particular, with reference to Figures 4 and 5, the layer 100 is applied between the auxiliary portions 40 of the transverse walls 30, 32 of the electrochemical assembly 10, in particular between the corresponding horizontal parts 42.

[0132] In particular, the thickness of the layer 100 is substantially equal to the thickness of the horizontal parts 42 of the auxiliary portions 40 of the transverse walls 30, 32 of the electrochemical assembly 10.

[0133] Thanks to the invention, the electrochemical assembly is simplified and its assembly is easier since the cover is made in a single piece. In addition, the invention makes it possible to avoid having to resort to a specific member for holding the electrochemical elements in the elevation direction. Also, the inertia under bending of the cover when the cover is stressed in the elevation direction is improved by the presence of the ribs of the cover.

Claims

1. Claims Electrochemical assembly (10) comprising: - a plurality of electrochemical elements (14) arranged one after the other in a longitudinal direction (X); - a first and a second longitudinal wall (20, 22) extending substantially perpendicular to the longitudinal direction (X) and substantially parallel to a median frontal plane (PFM) defined by a transverse direction (Y) and an elevation direction (Z) perpendicular to the longitudinal direction (X), the first and second longitudinal walls (20, 22) being arranged on either side of the plurality of electrochemical elements (14) in the longitudinal direction (X); - a first and a second transverse wall (30, 32) extending substantially parallel to a median sagittal plane (PSM) defined by the longitudinal direction (X) and the elevation direction (Z), the first transverse wall (30) connecting a first lateral edge (24) of the first longitudinal wall (20) and a first lateral edge (24) of the second longitudinal wall (22), the second transverse wall (32) connecting a second lateral edge (26) of the first longitudinal wall (20) and a second lateral edge (26) of the second longitudinal wall (22); - a cover (50) extending substantially parallel to a horizontal plane (PH) defined by the longitudinal direction (X) and the transverse direction (Y); the plurality of electrochemical elements (14) being held in position in the longitudinal direction (X) by the first and second longitudinal walls (20, 22) and in the transverse direction (Y) by the first and second transverse walls (30, 32), the cover (50) being made in a single piece and blocking the movement of the plurality of electrochemical elements (14) in the elevation direction (Z) in one direction, the cover (50) comprising: - a main wall (52) extending substantially parallel to the horizontal plane (PH), comprising an internal surface (54) in direct contact with the plurality of electrochemical elements (14) and an external surface (56) opposite the internal surface (54); and - a plurality of ribs (60) extending from the outer surface (56) of the main wall (52), substantially parallel to the median sagittal plane (MSP).

2. An electrochemical assembly (10) according to claim 1, wherein the cover (50) is mounted on the first and second longitudinal walls (20, 22).

3. An electrochemical assembly (10) according to claim 1 or 2, wherein the cover (50) comprises first and second external transverse walls (74, 76) extending from the external surface (56) of the main wall (52) of the cover (50), the first external transverse wall (74) of the cover (50) extending in the extension of the first transverse wall (30) of the electrochemical assembly (10), the second external transverse wall (76) of the cover (50) extending in the extension of the second transverse wall (32) of the electrochemical assembly (10).

4. Electrochemical assembly (10) according to claim 3, wherein the cover (50) further comprises a first internal transverse wall (80) extending from the external surface (56) of the main wall (52) of the cover (50) substantially parallel to the first external transverse wall (74) of the cover (50) and a second internal transverse wall (84) extending from the external surface (56) of the main wall (52) of the cover (50) substantially parallel to the second external transverse wall (76) of the cover (50), the first external transverse wall (74) and the first internal transverse wall (80) of the cover (50) delimiting a first space (82) for receiving at least a first interconnection bar (90) and / or first sensors (94) of the electrochemical assembly (10),the second external transverse wall (76) and the second internal transverse wall (84) of the cover (50) delimiting a second space (86) for receiving at least a second interconnection bar (92) and / or second sensors of the electrochemical assembly (10).,

5. Electrochemical assembly (10) according to claim 4, wherein the external transverse walls (74, 76) of the cover (50) comprise a plurality of lugs (77) capable of holding the corresponding interconnection bar (90, 92) and / or the corresponding sensors (94) in the corresponding receiving space (82, 86).

6. Electrochemical assembly (10) according to any one of claims 3 to 5, wherein the external transverse walls (74, 76) of the cover (50) each comprise at least one breakable portion (78) at a longitudinal end of said external transverse wall (74, 76), said at least one breakable portion (78) being capable of being cut to form a passage, said at least one breakable portion (78) being delimited by at least one pre-cut (79) made in said external transverse wall (74, 76).

7. An electrochemical assembly (10) according to any preceding claim, wherein at least two ribs (60) of the plurality of ribs (60) are separated by a wiring space (62) for receiving electrical cables (98) of the electrochemical assembly (10), at least one electrical cable (98) of the electrochemical assembly (10) extending into the wiring space (62).

8. The electrochemical assembly (10) of claim 7, wherein the ribs (60) of the plurality of ribs (60) comprise a plurality of lugs (64) adapted to hold electrical cables (98) of the electrochemical assembly (10) in the corresponding wiring space (62).

9. The electrochemical assembly (10) of claim 7 or 8, wherein the ribs (60) of the plurality of ribs (60) comprise openings (66) forming wiring passages for electrical cables (98) of the electrochemical assembly (10), at least one electrical cable (98) of the electrochemical assembly (10) extending into a wiring passage.

10. An electrochemical assembly (10) according to any preceding claim, wherein the cover (50) is made of a composite material, for example a composite material comprising a plastic and fibers.

11. Electrochemical assembly (10) according to any one of the preceding claims, in which the electrochemical elements (14) are of the prismatic type.

12. An electrochemical assembly (10) according to any preceding claim, wherein each of the transverse walls (30, 32) of the electrochemical assembly (10) comprises a main portion (34) extending substantially parallel to the median sagittal plane (MSP) and an auxiliary portion (40), the auxiliary portion (40) comprising a horizontal portion (42) extending from a lower edge (38) of the main portion (34) in the direction of the median sagittal plane (PSM) substantially parallel to the horizontal plane (PH), the plurality of electrochemical elements (14) resting on the horizontal portions (42) of the auxiliary portions (40) of the transverse walls (30, 32) of the electrochemical assembly (10).

13. Electrochemical assembly (10) according to claim 12, wherein the auxiliary portion (40) comprises vertical portions (46) extending from longitudinal ends (44) of the horizontal portion (42), the plurality of electrochemical elements (14) bearing on the vertical portions (46) of the auxiliary portions (40) of the transverse walls (30, 32) of the electrochemical assembly (10).

14. An electrochemical assembly (10) according to claim 12 or 13, wherein the electrochemical assembly (10) comprises a layer (100) of thermally conductive material applied under the plurality of electrochemical elements (14) between the auxiliary portions (40) of the transverse walls (30, 32) of the electrochemical assembly (10).

15. Electrochemical assembly (10) according to claim 14, wherein the thickness of the layer (100) of thermally conductive material is substantially equal to the thickness of the horizontal parts (42) of the auxiliary portions (40) of the transverse walls (30, 32) of the electrochemical assembly (10).

16. Battery (1) comprising at least one electrochemical assembly (10) according to any one of the preceding claims.

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