End plate assembly, battery pack, battery pack and electrical device

Abstract

This application discloses an endplate assembly, a battery pack, a battery module, and an electrical device. The endplate assembly is used to abut a battery cell. The endplate assembly includes a first endplate and a second endplate. The first endplate includes a first wall, a second wall, and a connecting wall. The first wall and the second wall are spaced apart and connected by the connecting wall. The first wall is located on the side of the second wall closer to the battery cell. The second endplate has an accommodating space, and the first endplate is at least partially located within the accommodating space. According to the endplate assembly of this application, by placing the first wall on the side of the second wall closer to the battery cell and connecting the first wall and the second wall by the connecting wall, the structural strength of the first endplate is increased, thereby increasing the restraining force of the first endplate on the battery cell. Furthermore, the first endplate and the second endplate can work together to bear the expansion force of the battery cell, enabling the endplate assembly to provide a sufficiently large restraining force on the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to an endplate assembly, a battery pack, a battery module, and an electrical device. Background Technology

[0002] Some battery packs typically include multiple cells. These cells expand and deform during operation, generating enormous expansion forces at the megapascal (MPa) level. If sufficient restraint is not applied to the cells, their performance will be significantly reduced.

[0003] In related technologies, some battery packs use end plate assemblies to constrain the two ends of the battery cells, and use straps to secure the battery cells and the end plate assemblies at both ends. However, these end plate assemblies provide insufficient restraint force to the battery cells. Utility Model Content

[0004] This application aims to at least partially address one of the aforementioned technical problems in the prior art. To this end, this application proposes an endplate assembly capable of providing sufficient restraint force to the battery cell.

[0005] This application also proposes a battery pack having the aforementioned endplate assembly.

[0006] This application also proposes a battery pack having the above-mentioned battery pack.

[0007] This application also proposes an electrical device having the aforementioned battery pack or battery module.

[0008] According to an embodiment of this application, an end plate assembly is used to abut against a battery cell. The end plate assembly includes a first end plate and a second end plate. The first end plate includes a first wall, a second wall, and a connecting wall. The first wall is spaced apart from the second wall and connected to it through the connecting wall. The first wall is located on the side of the second wall closer to the battery cell. The second end plate has an accommodating space, and the first end plate is at least partially located within the accommodating space.

[0009] According to the end plate assembly of the present application embodiment, by setting the first wall on the side of the second wall closer to the battery cell and connecting the first wall and the second wall through a connecting wall, it is beneficial to increase the structural strength of the first end plate, thereby increasing the restraining force of the first end plate on the battery cell. In addition, the first end plate and the second end plate can be used together to bear the expansion force of the battery cell, so that the end plate assembly can provide a sufficiently large restraining force on the battery cell.

[0010] According to some embodiments of this application, at least a portion of the thickness of the first wall is greater than the thickness of the second wall.

[0011] According to some embodiments of this application, the thickness of the first wall is equal to the thickness of the second wall.

[0012] According to some embodiments of this application, at least a portion of the thickness of the first wall is less than the thickness of the second wall.

[0013] According to some embodiments of this application, the first wall and the second wall are spaced apart in a first direction, and there are multiple connecting walls, which are spaced apart in a second direction, wherein the first direction and the second direction are different directions.

[0014] According to some embodiments of this application, there are no fewer than four connecting walls, and in the second direction, from one end of the first end plate to the other end, the spacing between every two adjacent connecting walls first decreases and then increases.

[0015] According to some embodiments of this application, there are no fewer than three connecting walls, and in the second direction, the spacing between any two adjacent connecting walls is equal from one end of the first end plate to the other end.

[0016] According to some embodiments of this application, an end plate cavity is formed between any two adjacent connecting walls, and the surfaces of the first wall and / or the second wall used to form the end plate cavity are arched surfaces, which arch in a direction away from the end plate cavity.

[0017] According to some embodiments of this application, there are multiple end plate cavities, and the radii of the arched surfaces of the multiple end plate cavities are equal; or, there are no fewer than three end plate cavities, and in the second direction, from one end of the first end plate to the other end, the radii of the arched surfaces of the different end plate cavities first decrease and then increase.

[0018] According to some embodiments of this application, in the second direction, the thickness of the first wall and / or the second wall has a thickness variation structure that is thicker in the middle and thinner at both ends.

[0019] According to some embodiments of this application, in the second direction, the first wall and / or the second wall have a uniform thickness structure.

[0020] According to some embodiments of this application, the surfaces of the first wall and the second wall that are opposite to each other are parallel to each other and are both planar.

[0021] According to some embodiments of this application, in the first direction, the second end plate has an opening facing the battery cell, and the first wall protrudes from the opening.

[0022] According to some embodiments of this application, in the first direction, the cross-section of the second end plate is a closed structure, and the first end plate is disposed within the closed structure.

[0023] According to some embodiments of this application, the structural strength of the first end plate is less than that of the second end plate.

[0024] According to some embodiments of this application, the first end plate is an end plate made of one or more materials selected from aluminum, aluminum alloy, copper, copper alloy, titanium alloy, zinc alloy, steel, silicone rubber, plastics, carbon fiber, and glass fiber; and / or,

[0025] The second end plate is made of one or more of the following materials: aluminum, aluminum alloy, copper, copper alloy, titanium alloy, zinc alloy, steel, silicone rubber, plastics, carbon fiber, and glass fiber.

[0026] According to some embodiments of this application, the size of the first end plate in the first direction ranges from 50mm to 200mm; and / or, the size of the first end plate in the second direction ranges from 50mm to 1000mm; and / or, the size of the first end plate in the third direction ranges from 50mm to 500mm; wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0027] According to a second aspect embodiment of this application, a battery pack includes a cell group, a connector, and the aforementioned end plate assembly. The cell group includes a plurality of cells, which are arranged in at least a first direction. The cell group has the end plate assembly at at least one end in the first direction, and the connector abuts the end plate assembly against the cell group.

[0028] According to the battery pack of the present application embodiment, the end plate assembly has a first wall disposed on the side of the second wall closer to the cell, and the first wall and the second wall are connected by a connecting wall. This helps to increase the structural strength of the first end plate, thereby increasing the restraining force of the first end plate on the cell. In addition, the first end plate and the second end plate can be used together to bear the expansion force of the cell, so that the end plate assembly can provide a sufficiently large restraining force on the cell.

[0029] According to some embodiments of this application, the battery cell assembly is provided with the end plate assembly at both ends in the first direction, and the second end plates at both ends of the battery cell assembly are connected by the connector.

[0030] According to some embodiments of this application, the connector includes a first pull plate and a second pull plate, the first pull plate and the second pull plate are separate, the battery cell assembly is located between the first pull plate and the second pull plate, and each of the first pull plate and the second pull plate is connected to the second end plate at both ends of the battery cell assembly.

[0031] According to some embodiments of this application, there are multiple first pull plates, and the multiple first pull plates are arranged along a second direction; and / or, there are multiple second pull plates, and the multiple second pull plates are arranged along a second direction.

[0032] According to some embodiments of this application, the connector is bonded and fixed to the battery cell.

[0033] According to some embodiments of this application, the battery pack further includes a first adhesive strip, which is disposed between the connector and the battery cell.

[0034] A battery pack according to a third aspect of this application includes a housing and the battery pack described above, wherein a receiving cavity is formed inside the housing, and the battery pack is disposed within the receiving cavity.

[0035] According to the battery pack of the present application embodiment, the end plate assembly has a first wall disposed on the side of the second wall closer to the cell, and the first wall and the second wall are connected by a connecting wall. This helps to increase the structural strength of the first end plate, thereby increasing the restraining force of the first end plate on the cell. In addition, the first end plate and the second end plate can be used together to bear the expansion force of the cell, so that the end plate assembly can provide a sufficiently large restraining force on the cell.

[0036] According to some embodiments of this application, the connector is bonded and fixed to the cavity wall of the receiving cavity.

[0037] According to some embodiments of this application, the battery pack further includes a second adhesive strip, which is disposed between the connector and the cavity wall of the receiving cavity.

[0038] The electrical equipment according to the fourth aspect of this application includes the battery pack or battery module described above.

[0039] According to the embodiments of the present application, the end plate assembly of the electrical device has a first wall disposed on the side of the second wall closer to the battery cell, and the first wall and the second wall are connected by a connecting wall. This is beneficial to increasing the structural strength of the first end plate, thereby increasing the restraining force of the first end plate on the battery cell. In addition, the first end plate and the second end plate can be used together to bear the expansion force of the battery cell, so that the end plate assembly can provide a sufficiently large restraining force on the battery cell.

[0040] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0041] Figure 1 This is an exploded view of an endplate assembly according to an embodiment of this application;

[0042] Figure 2This is a three-dimensional assembly schematic diagram of the endplate assembly according to an embodiment of this application;

[0043] Figure 3 This is an assembly front view of the endplate assembly according to an embodiment of this application;

[0044] Figure 4 This is a left view of the first endplate according to the first embodiment of this application;

[0045] Figure 5 yes Figure 4 A schematic cross-sectional view along section line AA in the middle;

[0046] Figure 6 This is a cross-sectional schematic diagram of the first end plate according to the second embodiment of this application;

[0047] Figure 7 This is a cross-sectional schematic diagram of the first end plate according to the third embodiment of this application;

[0048] Figure 8 This is a cross-sectional schematic diagram of the first end plate according to the fourth embodiment of this application;

[0049] Figure 9 This is a cross-sectional schematic diagram of the first end plate according to the fifth embodiment of this application;

[0050] Figure 10 This is a cross-sectional schematic diagram of the first end plate according to the sixth embodiment of this application;

[0051] Figure 11 This is a cross-sectional schematic diagram of the first end plate according to the seventh embodiment of this application;

[0052] Figure 12 This is a cross-sectional schematic diagram of the first end plate according to the eighth embodiment of this application;

[0053] Figure 13 This is a cross-sectional schematic diagram of the first end plate according to the ninth embodiment of this application;

[0054] Figure 14 This is a cross-sectional schematic diagram of the first end plate according to the tenth embodiment of this application;

[0055] Figure 15 This is a cross-sectional schematic diagram of the first end plate according to the eleventh embodiment of this application;

[0056] Figure 16 This is a cross-sectional schematic diagram of the first end plate according to the twelfth embodiment of this application;

[0057] Figure 17 This is a cross-sectional schematic diagram of the first end plate according to the thirteenth embodiment of this application;

[0058] Figure 18 This is a cross-sectional schematic diagram of the first end plate according to the fourteenth embodiment of this application;

[0059] Figure 19 This is a perspective view of the second end plate according to another embodiment of this application;

[0060] Figure 20 This is an assembly diagram of a battery pack according to some embodiments of this application;

[0061] Figure 21 This is an exploded view of a battery pack according to some embodiments of this application;

[0062] Figure 22 These are schematic diagrams of electrical equipment according to some embodiments of this application;

[0063] Figure 23 This is a schematic diagram of an electrical device according to other embodiments of this application.

[0064] Figure label:

[0065] Electrical equipment 10000, battery pack 1000, battery group 100, end plate assembly 10, first end plate 1, first wall 11, first arched surface 111, second wall 12, second arched surface 121, connecting wall 13, end plate cavity 14, second end plate 2, cell group 20, cell 201, connector 30, first pull plate 301, second pull plate 302, first limiting adhesive strip 40, first upper limit adhesive strip 401, first lower limit adhesive strip 402, first thermally conductive structural adhesive 501, second thermally conductive structural adhesive 502, second limiting adhesive strip 200, second upper limit adhesive strip 2001, second lower limit adhesive strip 2002. Detailed Implementation

[0066] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0067] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] The following is combined with Figures 1-23The present application describes in detail the end plate assembly 10, battery pack 100, battery pack 1000, and electrical device 10000 according to embodiments thereof.

[0069] Reference Figures 1-3 , Figures 20-21 As shown, the end plate assembly 10 according to an embodiment of this application is used to abut against the battery cell 201. The end plate assembly 10 includes a first end plate 1 and a second end plate 2. The first end plate 1 includes a first wall 11, a second wall 12 and a connecting wall 13. The first wall 11 and the second wall 12 are spaced apart and connected by the connecting wall 13. The first wall 11 is located on the side of the second wall 12 closer to the battery cell 201. The second end plate 2 has an accommodating space, and the first end plate 1 is at least partially located in the accommodating space.

[0070] Specifically, the first wall 11 and the second wall 12 are spaced apart. When the end plate assembly 10 is used to constrain the end of the battery cell 201, the first wall 11 is closer to the battery cell 201 than the second wall 12. The large surface of the first wall 11 is positioned opposite to the large surface of the battery cell 201. When the expansion force of the battery cell 201 on the end plate assembly 10 acts on the first end plate 1, it can be first borne by the first wall 11 and then transferred to the second wall 12 through the connecting wall 13. In this way, the first wall 11 and the second wall 12 are connected by the connecting wall 13, which helps to increase the structural strength of the first end plate 1, thereby increasing the restraining force of the first end plate 1 on the battery cell 201. The end plate assembly 10 has a better bearing capacity for the expansion force of the battery cell 201, and the restraining force on the battery cell 201 is more uniform.

[0071] Both the first end plate 1 and the second end plate 2 are used to constrain the ends of the battery cell 201. Therefore, the first end plate 1 and the second end plate 2 provide a relatively large constraint force on the battery cell 201.

[0072] According to the embodiment of this application, the end plate assembly 10, by setting the first wall 11 on the side of the second wall 12 close to the cell 201 and connecting the first wall 11 and the second wall 12 through the connecting wall 13, is beneficial to increase the structural strength of the first end plate 1, thereby increasing the restraining force of the first end plate 1 on the cell 201. In addition, the first end plate 1 and the second end plate 2 can be used together to bear the expansion force of the cell 201, so that the end plate assembly 10 can provide a sufficiently large restraining force on the cell 201.

[0073] In some embodiments of this application, reference is made to Figures 4-10As shown, at least a portion of the thickness of the first wall 11 is greater than the thickness of the second wall 12. When the expansion force of the cell 201 on the end plate assembly 10 acts on the first end plate 1, it is first borne by the first wall 11. Therefore, setting at least a portion of the thickness of the first wall 11 to be greater than the thickness of the second wall 12 can improve the load-bearing effect of the first end plate 1 on the expansion force of the cell 201. In a specific embodiment, the entire thickness of the first wall 11 may be greater than the thickness of the second wall 12, or a portion of the thickness of the first wall 11 may be greater than the thickness of the second wall 12.

[0074] In some embodiments of this application, reference is made to Figures 11-12 As shown, the thickness of the first wall 11 is equal to the thickness of the second wall 12. In this way, the structure of the first end plate 1 is simple and easy to process and manufacture.

[0075] In some embodiments of this application, reference is made to Figures 13-18 As shown, at least a portion of the thickness of the first wall 11 is less than the thickness of the second wall 12. When the expansion force of the cell 201 on the end plate assembly 10 acts on the first end plate 1, it is first borne by the first wall 11, and then transmitted to the second wall 12 via the connecting wall 13. By setting the thickness of the second wall 12 to be greater than at least a portion of the thickness of the first wall 11, it is beneficial to reduce the deformation of the second wall 12. In a specific embodiment, the entire thickness of the first wall 11 may be less than the thickness of the second wall 12, or a portion of the thickness of the first wall 11 may be less than the thickness of the second wall 12.

[0076] In some embodiments of this application, reference is made to Figure 1 , Figures 4-21 As shown, the first wall 11 and the second wall 12 are spaced apart in a first direction, and there are multiple connecting walls 13, which are spaced apart in a second direction. The first direction and the second direction are different directions. In some embodiments of this application, the first direction is perpendicular to the second direction; for example, the first direction is... Figure 1 , Figures 19-21 The F1-F2 direction shown is the second direction. Figure 1 , Figures 4-21 The F3-F4 directions are shown in the diagram.

[0077] like Figures 20-21 As shown, when the end plate assembly 10 is placed at both ends of the cuboid-shaped cell assembly 20, the first direction is the length direction of the cell assembly 20, and the second direction is the width direction of the cell assembly 20. The expansion force of the cell 201 on the end plate assembly 10 acts on the first end plate 1 along the first direction. This expansion force is first borne by the first wall 11, and then transmitted to the second wall 12 through multiple connecting walls 13.

[0078] In some embodiments of this application, the connecting wall 13 extends along a third direction, which is the F5-F6 direction. The cross-sectional view of the first end plate 1 in a plane perpendicular to this third direction is shown below. Figures 4-18 As shown. When the end plate assembly 10 is placed at both ends of the cuboid-shaped cell assembly 20, the third direction is the height direction of the cell assembly 20.

[0079] In related technologies, under the pressure of a large expansion force on the battery cell, the end plates at both ends of the battery cell are prone to bending and denting due to insufficient moment of inertia, which in turn leads to uneven expansion force on the large surface of the battery cell and reduces the performance of the battery cell. In the first end plate 1 of this application, by providing multiple connecting walls 13, the bending resistance and compressive resistance can be increased, and the first end plate 1 is not easy to bend or dent when the battery cell 201 presses against the first end plate 1.

[0080] In the first end plate 1 of this application, any two adjacent connecting walls 13 are spaced apart to form an end plate cavity 14, thereby reducing the weight of the first end plate 1.

[0081] In some embodiments, the end plate cavity 14 may extend through the first end plate 1 in a third direction.

[0082] In other embodiments, the end plate cavity 14 may not penetrate the first end plate 1 in a third direction, that is, the end plate cavity 14 is formed as a blind groove.

[0083] In some embodiments, there are multiple connecting walls 13, and the thickness of the multiple connecting walls 13 is equal in the second direction.

[0084] In some embodiments, there are multiple connecting walls 13, and at least two connecting walls 13 have unequal thicknesses in the second direction. For example, in the second direction, the thickness of the connecting wall 13 is greater closer to the middle position of the first end plate 1, which can increase the bending resistance of the first end plate 1, and the middle part of the first end plate 1 is not easily bent or dented when the cell 201 presses the first end plate 1.

[0085] In some embodiments of this application, reference is made to Figure 5 , Figure 7 , Figure 9 , Figure 11 , Figure 13 , Figure 15 , Figure 17As shown, there are no fewer than four connecting walls 13. In the second direction, from one end of the first end plate 1 to the other, the spacing between any two adjacent connecting walls 13 first decreases and then increases. Thus, at positions where the spacing between adjacent connecting walls 13 is smaller, the first end plate 1 has higher strength and stiffness. The large expansion force in the center of the battery cell 201 is restrained by the high-strength center of the first end plate 1, resulting in less deformation of the first end plate 1. Simultaneously, this arrangement increases the bending and compressive strength of the first end plate 1 while also meeting the requirements of lightweight design, as the multiple connecting walls 13 of the first end plate 1 do not need to be arranged in a densely packed manner.

[0086] exist Figure 5 In the example, there are twelve connecting walls 13. The distance between the first and second connecting walls is d1, the distance between the second and third connecting walls is d2, the distance between the third and fourth connecting walls is d3, the distance between the fourth and fifth connecting walls is d4, the distance between the fifth and sixth connecting walls is d5, the distance between the sixth and seventh connecting walls is d6, the distance between the seventh and eighth connecting walls is d7, the distance between the eighth and ninth connecting walls is d8, the distance between the ninth and tenth connecting walls is d9, the distance between the tenth and eleventh connecting walls is d10, and the distance between the eleventh and twelfth connecting walls is d11. The following conditions are met: d1 > d2 > d3 > d4 > d5 > d6, d6 < d7 < d8 < d9 < d10 < d11.

[0087] In some optional embodiments, the variation patterns of d1, d2, d3, d4, d5, and d6 can be set to decrease according to an arithmetic or geometric sequence.

[0088] In some optional embodiments, the variation patterns of d6, d7, d8, d9, d10, and d11 can be set to increase according to an arithmetic or geometric sequence.

[0089] In some optional embodiments, d1, d2, d3, d4, and d5 may be equal, for example, d1 = d2 > d3 > d4 > d5 > d6, or d1 > d2 = d3 > d4 > d5 > d6, or d1 = d2 = d3 > d4 > d5 > d6, or d1 > d2 > d3 > d4 = d5 > d6, etc. That is to say, in the second direction, from one end of the first end plate 1 to the other end, the spacing between every two adjacent connecting walls 13 generally shows a trend of first decreasing and then increasing.

[0090] In some embodiments of this application, reference is made to Figure 5 , Figure 7 , Figure 9 , Figure 11 , Figure 13 , Figure 15 , Figure 17 As shown, in the second direction, the distance between two adjacent connecting walls 13 located in the middle of the first end plate 1 is the shortest, thereby increasing the strength and rigidity of the first end plate 1 in the middle part. Since the expansion force of the battery cell 201 is the greatest in the middle part of the battery cell 201 in the second direction when the battery cell 201 expands, the first end plate 1 can better bear the expansion force of the battery cell 201 and reduce the deformation of the first end plate 1.

[0091] In some embodiments of this application, reference is made to Figure 6 , Figure 8 , Figure 10 , Figure 12 , Figure 14 , Figure 16 , Figure 18 As shown, there are no fewer than three connecting walls 13, and in the second direction, from one end of the first end plate 1 to the other, the spacing between any two adjacent connecting walls 13 is equal. For example, in Figure 6 In the example, the distance between any two adjacent connecting walls 13 is d21. Figure 8 In the example, the distance between any two adjacent connecting walls 13 is d22. Figure 10 In the example, the distance between any two adjacent connecting walls 13 is d23. Figure 12 In the example, the distance between any two adjacent connecting walls 13 is d24. Figure 14 In the example, the distance between any two adjacent connecting walls 13 is d25. Figure 16 In the example, the distance between any two adjacent connecting walls 13 is d26. Figure 18 In the example, the distance between any two adjacent connecting walls 13 is d27.

[0092] In some embodiments of this application, the value range of any one of d21, d22, d23, d24, d25, d26, and d27 is 1mm to 100mm. For example, any one of d21, d22, d23, d24, d25, d26, and d27 can be 1mm, 20mm, 40mm, 60mm, 80mm, 100mm, etc.

[0093] In some embodiments of this application, an end plate cavity 14 is formed between any two adjacent connecting walls 13, and the surfaces of the first wall 11 and / or the second wall 12 used to form the end plate cavity 14 are arched surfaces, which arch in a direction away from the end plate cavity 14. In some embodiments, refer to Figures 7-8As shown, the surface of the first wall 11 used to form the end plate cavity 14 is an arched surface, namely the first arched surface 111, which arches in a direction away from the second wall 12. In other embodiments, refer to Figures 15-16 As shown, the surface of the second wall 12 used to form the end plate cavity 14 is an arched surface, namely the second arched surface 121, which arches in a direction away from the first wall 11. In some embodiments not shown in the figure, the surfaces of the first wall 11 and the second wall 12 used to form the end plate cavity 14 are both arched surfaces, with the first arched surface 111 on the first wall 11 arching in a direction away from the second wall 12, and the second arched surface 121 on the second wall 12 arching in a direction away from the first wall 11.

[0094] In some embodiments of this application, reference is made to Figures 7-8 , Figures 15-16 As shown, the minimum thickness between the arched surface and the maximum outer surface of the wall is t0.

[0095] In some embodiments, the value of t0 ranges from 1 mm to 10 mm. For example, t0 can be 1 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, etc.

[0096] In other embodiments, t0 is greater than 2 mm. For example, t0 can be 2.1 mm, 2.5 mm, 3 mm, 4 mm, or other values ​​greater than 2 mm.

[0097] In some embodiments of this application, there are multiple end plate cavities 14, as shown in the reference. Figure 8 , Figure 16 As shown, the radii of the arched surfaces of the multiple end plate cavities 14 are equal. For example, in Figure 8 In the example, the radius of the arched surface of multiple end plate cavities 14 is R2. Figure 16 In the example, the radius of the arched surface of multiple end plate cavities 14 is R4. In this way, the multiple end plate cavities 14 have the same structure, which facilitates processing and manufacturing.

[0098] In some embodiments of this application, the value of R2 ranges from 1 mm to 10000 mm. For example, R2 can be 1 mm, 500 mm, 1000 mm, 3000 mm, 5000 mm, 8000 mm, 10000 mm, etc.

[0099] In some embodiments of this application, the value of R4 ranges from 1 mm to 10000 mm. For example, R4 can be 1 mm, 500 mm, 1000 mm, 3000 mm, 5000 mm, 8000 mm, 10000 mm, etc.

[0100] In other embodiments of this application, there are at least three end plate cavities 14, and in the second direction, from one end of the first end plate 1 to the other, the radius of the arched surface of the different end plate cavities 14 first decreases and then increases. For example, referring to... Figure 7 , Figure 15 As shown, there are thirteen end plate cavities 14. In the second direction, from one end of the first end plate 1 to the other, i.e., from end F3 to end F4 of the first end plate 1, the radius of the arched surface of the first end plate cavity to the seventh end plate cavity gradually decreases, and the radius of the arched surface of the seventh end plate cavity to the thirteenth end plate cavity gradually increases. This arrangement also increases the bending and compressive strength of the first end plate 1.

[0101] In some embodiments of this application, reference is made to Figure 7 , Figure 15 As shown, in the second direction, the radius of the arched surface of the end plate cavity 14 located in the middle of the first end plate 1 is the smallest, and the distance between the two adjacent connecting walls 13 located in the middle of the first end plate 1 is the shortest. The first end plate 1 has higher strength and rigidity in the middle part. Since the expansion force of the battery cell 201 is the largest in the middle part of the battery cell 201 in the second direction when the battery cell 201 expands, the first end plate 1 can better bear the expansion force of the battery cell 201 and reduce the deformation of the first end plate 1.

[0102] In other embodiments, at least two adjacent end plate cavities from the first to the sixth end plate cavity have equal radii of their arched surfaces, and at least two adjacent end plate cavities from the eighth to the thirteenth end plate cavity 14 have equal radii of their arched surfaces. That is, in the second direction, from one end of the first end plate 1 to the other, the radii of the arched surfaces of different end plate cavities 14 generally decrease first and then increase, rather than changing stepwise.

[0103] In some embodiments of this application, in the second direction, the thickness of the first wall 11 and / or the second wall 12 has a varying thickness structure, being thicker in the middle and thinner at both ends. By setting the thickness of the first wall 11 and / or the second wall 12 to a varying thickness structure, the bending and compressive strength of the middle part of the first end plate 1 can be increased, and the requirements of lightweight design can be met.

[0104] Specifically, in some embodiments, reference is made to Figures 9-10 As shown, the first wall 11 has a thickness variation structure, being thicker in the middle and thinner at both ends. In other embodiments, refer to... Figures 17-18 As shown, the second wall 12 has a thickness variation structure that is thicker in the middle and thinner at both ends. In some embodiments not shown in the figure, both the first wall 11 and the second wall 12 have a thickness variation structure that is thicker in the middle and thinner at both ends.

[0105] It should be noted that a "thickness variation structure" can be a continuous thickness variation, a stepped thickness variation, or other forms of variation. For example, in Figures 9-10 , Figures 17-18 In the example, the "thickness variation structure" is an arc-shaped structure with a continuously varying thickness, and the curvature of the "thickness variation structure" is R0. In some embodiments not shown in the figure, the "thickness variation structure" can be a gradient change, for example, the wall thickness decreases proportionally or unequally in the direction from the middle to both ends.

[0106] In some embodiments of this application, the value of R0 ranges from 2mm to 10000mm. For example, R0 can be 2mm, 500mm, 1000mm, 3000mm, 5000mm, 8000mm, 10000mm, etc.

[0107] exist Figure 9 In the example, the thickness of the first wall 11 has a thickness variation structure that is thicker in the middle and thinner at both ends. The minimum thickness of the first wall 11 is t1, the maximum thickness of the first wall 11 is t2, the minimum distance between two adjacent connecting walls 13 in the middle of the first end plate 1 is d0, and t2 / t1 > 1.

[0108] In some embodiments of this application, the value of t1 ranges from 1mm to 10mm. For example, t1 can be 1mm, 2mm, 4mm, 6mm, 8mm, 10mm, etc.

[0109] In some embodiments of this application, the value of t2 ranges from 1 mm to 10 mm. For example, t2 can be 1 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, etc.

[0110] In some embodiments of this application, the value of d0 ranges from 1mm to 100mm. For example, d0 can be 1mm, 10mm, 20mm, 40mm, 60mm, 80mm, 100mm, etc.

[0111] In some embodiments of this application, the first wall 11 and / or the second wall 12 have a uniform thickness in the second direction. In some embodiments, refer to Figures 5-6 , Figures 11-18 As shown, the first wall 11 has a uniform thickness. In other embodiments, refer to... Figures 5-14 As shown, the second wall 12 has a uniform thickness. In some other embodiments, refer to... Figures 5-6 , Figures 11-14 As shown, both the first wall 11 and the second wall 12 have a uniform thickness. This uniform thickness structure facilitates processing and manufacturing, and also ensures more uniform force transmission.

[0112] In some embodiments of this application, the first wall 11 and the second wall 12 are of equal thickness, with the first wall 11 being thicker than the second wall 12. (Refer to...) Figures 5-6 As shown, the thickness of the first wall 11 is t11, the thickness of the second wall 12 is t21, t11 / t21>1, and t11>t21.

[0113] In some embodiments of this application, the value of t11 ranges from 1mm to 10mm. For example, t11 can be 1mm, 2mm, 4mm, 6mm, 8mm, 10mm, etc.

[0114] In some embodiments of this application, the value of t21 ranges from 1mm to 10mm. For example, t21 can be 1mm, 2mm, 4mm, 6mm, 8mm, 10mm, etc.

[0115] In some embodiments of this application, the first wall 11 and the second wall 12 are of equal thickness, with the thickness of the first wall 11 being equal to the thickness of the second wall 12. (Refer to...) Figures 11-12 As shown, the thickness of the first wall 11 is t12, the thickness of the second wall 12 is t22, t12 / t22=1, t12=t22.

[0116] In some embodiments of this application, the first wall 11 and the second wall 12 are of equal thickness, with the thickness of the first wall 11 being less than the thickness of the second wall 12. (Refer to...) Figures 13-14 As shown, the thickness of the first wall 11 is t13, the thickness of the second wall 12 is t23, t13 / t23 < 1, and t13 < t23.

[0117] In some embodiments of this application, reference is made to Figures 5-18 As shown, the surfaces of the first wall 11 and the second wall 12, which are opposite to each other, are parallel and both are planar. The surface of the first wall 11 facing the cell 201 is planar. When the expansion force of the cell 201 is transmitted to the first wall 11, the planar structure of the first wall 11 makes the restraining force on the cell 201 more uniform. The surface of the second wall 12 facing away from the first wall 11 is planar. When the cell 201 presses against the first end plate 1, the second wall 12 can better transmit force to the second end plate 2. The force between the second wall 12 and the second end plate 2 is more uniform, which helps to reduce the deformation of the second end plate 2.

[0118] In some embodiments of this application, reference is made to Figures 1-3 , Figure 21As shown, in the first direction, or in a plane perpendicular to the second direction, the second end plate 2 is provided with an opening facing the battery cell 201, and the first wall 11 protrudes from the opening of the second end plate 2. In other words, the cross-section of the second end plate 2 is an open structure, and the opening of the second end plate 2 faces the battery cell 201. For example, the cross-section of the second end plate 2 may be in a "U" shape or a "C" shape. The first end plate 1 is installed in the second end plate 2 from the opening of the second end plate 2, and the first wall 11 protrudes from the opening of the second end plate 2 towards the direction where the battery cell 201 is located, that is, the first wall 11 is exposed from the opening of the second end plate 2, so that the first wall 11 can directly abut against the battery cell 201, as Figure 21 shown. In addition, the opening of the second end plate 2 makes the cross-section of the second end plate 2 an open structure, and further makes the installation and disassembly operations of the first end plate 1 in the second end plate 2 relatively convenient.

[0119] In some embodiments of the present application, referring to Figure 19 shown, in the first direction, or in a plane perpendicular to the second direction, the cross-section of the second end plate 2 is a closed structure, and the first end plate 1 is disposed within the closed structure. At this time, the first wall 11 is surrounded by the second end plate 2, and the second end plate 2 directly abuts against the battery cell 201. In addition, the second end plate 2 can protect the first end plate 1 from the circumferential direction. In Figure 19 the example, the cross-section of the second end plate 2 is in a "square" shape.

[0120] In some embodiments of the present application, the structural strength of the first end plate 1 is less than that of the second end plate 2. The second end plate 2 can better support the first end plate 1, and the second end plate 2 can supplement the strength of the first end plate 1 to prevent the situation that the battery cell 201 cannot be constrained due to insufficient strength of the first end plate 1 when the first end plate 1 is provided alone.

[0121] In some embodiments of the present application, the first end plate 1 can be selected from one material or a combination of multiple materials such as aluminum, aluminum alloy, copper, copper alloy, titanium alloy, zinc alloy, steel, silicone rubber, plastic, carbon fiber, glass fiber, etc. to make the end plate.

[0122] In some embodiments of the present application, the second end plate 除了上述内容,第二端板2可选为铝、铝合金、铜、铜合金、钛合金、锌合金、钢材、硅橡胶、塑胶类、碳纤维、玻璃纤维等中的一种材料或多种材料组合制成的端板。

[0123] In some embodiments of the present application, the dimension of the first end plate 1 in the first direction ranges from 50 mm to 200 mm. For example, the dimension of the first end plate 1 in the first direction can be 50 mm, 100 mm, 150 mm, 200 mm, etc. Referring to Figure 1 shown, the first direction is the F1-F2 direction.

[0124] In some embodiments of this application, the dimension of the first end plate 1 in the second direction ranges from 50mm to 1000mm. For example, the dimension of the first end plate 1 in the second direction can be 50mm, 100mm, 150mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, etc. (Refer to...) Figure 1 As shown, the second direction is the F3-F4 direction.

[0125] In some embodiments of this application, the dimension of the first end plate 1 in the third direction ranges from 50mm to 500mm. For example, the dimension of the first end plate 1 in the third direction can be 50mm, 100mm, 150mm, 200mm, 300mm, 400mm, 500mm, etc. (Refer to...) Figure 1 As shown, the third direction is F5-F6.

[0126] In some embodiments of this application, the dimension of the first end plate 1 in the first direction ranges from 50mm to 200mm, the dimension of the first end plate 1 in the second direction ranges from 50mm to 1000mm, and the dimension of the first end plate 1 in the third direction ranges from 50mm to 500mm, wherein the first direction, the second direction, and the third direction are mutually perpendicular. For example, the outline of the first end plate 1 is a cuboid, referring to... Figure 1 As shown, the first direction is F1-F2, the second direction is F3-F4, and the third direction is F5-F6.

[0127] Reference Figure 1 As shown, the first end plate 1 has a length L in the second direction, with a value ranging from 50mm to 1000mm. The first end plate 1 has a height H in the third direction, with a value ranging from 50mm to 500mm. The first end plate 1 has a width W in the first direction, with a value ranging from 50mm to 200mm. For example, in a specific example, the length L of the first end plate 1 is 1000mm, the height H of the first end plate 1 is 200mm, and the width W of the first end plate 1 is 50mm.

[0128] Reference Figures 20-21 As shown, the battery pack 100 according to the second aspect of this application may include a cell pack 20, a connector 30 and an end plate assembly 10 of the above embodiment. The cell pack 20 includes a plurality of cells 201, which are arranged in at least a first direction. The cell pack 20 is provided with an end plate assembly 10 at at least one end in the first direction, and the connector 30 abuts the end plate assembly 10 against the cell pack 20.

[0129] According to the battery pack 100 of the present application embodiment, its end plate assembly 10, by setting the first wall 11 on the side of the second wall 12 near the cell 201 and connecting the first wall 11 and the second wall 12 through the connecting wall 13, is conducive to increasing the structural strength of the first end plate 1, thereby increasing the restraining force of the first end plate 1 on the cell 201. In addition, the first end plate 1 and the second end plate 2 can be used together to bear the expansion force of the cell 201, so that the end plate assembly 10 can provide a sufficiently large restraining force on the cell 201 for joint use.

[0130] In some embodiments of this application, reference is made to Figures 20-21 As shown, the battery cell assembly 20 has end plate assemblies 10 at both ends in the first direction, and the second end plates 2 at both ends of the battery cell assembly 20 are connected by connectors 30. Thus, the distance between the two second end plates 2 is determined by the connectors 30. When the battery cell 201 expands, the deformation of the connectors 30 is small, therefore the change in distance between the two second end plates 2 is small. The connectors 30, in conjunction with the two second end plates 2, provide a strong constraint force for the first end plate 1 and the battery cell assembly 20. When the battery cell 201 expands, the battery cell 201 presses outward against the first end plate 1, and the first end plate 1 presses outward against the second end plate 2. Due to the restrictive effect of the connectors 30, the battery cell 201 is constrained between the two first end plates 1.

[0131] In some embodiments of this application, the connector 30 may be a high-strength steel plate, a carbon fiber plate, etc.

[0132] In some embodiments of this application, cell 201 is a solid-state battery cell. Solid-state batteries differ from conventional liquid batteries. During operation, solid-state batteries can generate megapascal-level expansion forces. Without sufficient restraint force, the performance of the solid-state battery will be significantly reduced, or it may even fail to function, thus losing its advantages. In related technologies, liquid batteries are restrained by having left and right end plates in contact with the large surface area of ​​the cell, along with upper and lower pull plates to achieve restraint and provide sufficient restraint force. However, for solid-state batteries with extremely large expansion forces, under the same spatial conditions, the left and right end plates need to simultaneously meet the design requirements of ultra-high strength and ultra-high stiffness (providing ultra-high restraint force). Currently, it is difficult for a single material to simultaneously possess both of these properties. In addition, in related technologies, end plates and pull plates are often used to constrain the cell packs of solid-state batteries. For cells with large expansion forces, due to unreasonable end plate structure design, the area where the end plate contacts the cell surface is prone to denting, collapse, bending and deformation, which leads to uneven constraining force on the cell and thus reduces the performance of solid-state batteries.

[0133] This application proposes an end plate assembly 10 for improving the uniformity of the restraint force on a battery cell 201. The battery cell assembly 20, with the help of a connector 30, a second end plate 2, and a first end plate 1, provides a strong restraint force. The second end plate 2 is assembled with the first end plate 1, and the first end plate 1, through its bending and compressive resistance design, can improve the uniformity of the restraint force on the large surface of the battery cell 201, thereby improving the cycle performance of the battery cell 201. Using the end plate assembly 10 and connector 30 of this application to restrain both ends of the battery cell 201 provides a large restraint force, achieving effective restraint of the battery cell 201.

[0134] In some embodiments of this application, reference is made to Figure 21 As shown, the connector 30 is a pull plate, which includes a first pull plate 301 and a second pull plate 302. The first pull plate 301 and the second pull plate 302 are separated, and the battery cell assembly 20 is located between the first pull plate 301 and the second pull plate 302. Each of the first pull plate 301 and the second pull plate 302 is connected to the second end plate 2 at both ends of the battery cell assembly 20.

[0135] In some embodiments of this application, there are multiple first pull plates 301, arranged along a second direction. The multiple first pull plates 301 can be sequentially arranged along the second direction, thereby constraining the second end plates 2 at both ends of the battery cell assembly 20 in the second direction. The second direction is... Figure 1 , Figures 4-21 The F3-F4 directions are shown in the diagram.

[0136] In some embodiments of this application, there are multiple second pull plates 302, arranged along a second direction. The multiple second pull plates 302 can be sequentially arranged along the second direction, thereby constraining the second end plates 2 at both ends of the battery cell assembly 20 in the second direction. The second direction is... Figure 1 , Figures 4-21 The F3-F4 directions are shown in the diagram.

[0137] In some embodiments of this application, the connector 30 is bonded and fixed to the battery cell 201. Specifically, the connector 30 and the battery cell 201 are bonded and fixed together using a thermally conductive structural adhesive. In some embodiments, the connector 30 includes a first pull plate 301 and a second pull plate 302. The first pull plate 301 is bonded and fixed to the battery cell 201 using a first thermally conductive structural adhesive 501, and the second pull plate 302 is bonded and fixed to the battery cell 201 using a second thermally conductive structural adhesive 502.

[0138] In some embodiments of this application, the battery pack 100 further includes a first adhesive-limiting strip 40, which is disposed between the connector 30 and the battery cell 201, with the connector 30 and the battery cell 201 separated by the first adhesive-limiting strip 40. The first adhesive-limiting strip 40 is used to control the adhesive thickness between the connector 30 and the battery cell 201. For example, the first adhesive-limiting strip 40 separates the connector 30 and the battery cell 201, and the adhesive thickness between the connector 30 and the battery cell 201 can be equal to the height of the first adhesive-limiting strip 40, thereby making the adhesive thickness between the connector 30 and the battery cell 201 controllable.

[0139] In some embodiments, refer to Figure 21 As shown, the connector 30 includes a first pull plate 301 and a second pull plate 302. The first pull plate 301 is separated from the battery cell 201 by a first upper limit adhesive strip 401, and the second pull plate 302 is separated from the battery cell 201 by a first lower limit adhesive strip 402.

[0140] In some embodiments, refer to Figure 21 As shown, the first pull plate 301 is located above the second pull plate 302.

[0141] In some embodiments not shown in the figures, the connector 30 is a strap, with one part of the strap fitted over the end plate assembly 10 and the other part fitted over the cell assembly 20, so that the end plate assembly 10 and the cell assembly 20 are bound together. The number of straps can be one, two or more.

[0142] Reference Figures 20-21 As shown, the battery pack 1000 according to the third aspect of this application includes a housing and the battery pack 100 of the above embodiment. The housing has a receiving cavity inside, and the battery pack 100 is disposed in the receiving cavity.

[0143] According to the battery pack 1000 of the present application embodiment, its end plate assembly 10, by setting the first wall 11 on the side of the second wall 12 near the cell 201 and connecting the first wall 11 and the second wall 12 through the connecting wall 13, is conducive to increasing the structural strength of the first end plate 1, thereby increasing the restraining force of the first end plate 1 on the cell 201. In addition, the first end plate 1 and the second end plate 2 can be used together to bear the expansion force of the cell 201, so that the end plate assembly 10 can provide a sufficiently large restraining force on the cell 201.

[0144] In some embodiments of this application, the connector 30 is bonded and fixed to the cavity wall of the receiving cavity. Specifically, the connector 30 is bonded and fixed to the cavity wall of the receiving cavity using a thermally conductive structural adhesive. In some embodiments, refer to... Figure 21As shown, the connector 30 includes a first pull plate 301 and a second pull plate 302. The first pull plate 301 and the second pull plate 302 are separated. The battery cell assembly 20 is located between the first pull plate 301 and the second pull plate 302. The first pull plate 301 is bonded and fixed to the cavity wall of the receiving cavity by a third thermally conductive structural adhesive. The second pull plate 302 is bonded and fixed to the cavity wall of the receiving cavity by a fourth thermally conductive structural adhesive.

[0145] In some embodiments of this application, the battery pack 1000 further includes a second adhesive-limiting strip 200, which is disposed between the connector 30 and the cavity wall of the receiving cavity, with the connector 30 and the cavity wall of the receiving cavity separated by the second adhesive-limiting strip 200. The second adhesive-limiting strip 200 is used to control the adhesive thickness between the connector 30 and the cavity wall of the receiving cavity. For example, the second adhesive-limiting strip 200 separates the connector 30 from the cavity wall of the receiving cavity, and the adhesive thickness between the connector 30 and the cavity wall of the receiving cavity can be equal to the height of the second adhesive-limiting strip 200, thereby making the adhesive thickness between the connector 30 and the cavity wall of the receiving cavity controllable.

[0146] In some embodiments of this application, the housing includes a housing body, a cover, and a heat exchange plate. The cover is located above the housing body, and a first pull plate 301 is located above a second pull plate 302. The first pull plate 301 and the cover are separated by a second upper limit adhesive strip 2001 and are bonded together with thermally conductive structural adhesive. The heat exchange plate is located below the housing body, and a second pull plate 302 is separated from the heat exchange plate by a second lower limit adhesive strip 2002 and is bonded together with thermally conductive structural adhesive. The heat exchange plate can be a liquid-cooled plate containing a cooling medium for cooling the battery cell 201. The battery pack 1000 forms an integral heat transfer path: battery cell 201 - thermally conductive structural adhesive - first pull plate 301 and second pull plate 302 - thermally conductive structural adhesive - cover and heat exchange plate.

[0147] In some other embodiments of this application, the area above the first pull plate 301 and the area below the second pull plate 302 are both heat exchange plates, and the first pull plate 301, the second pull plate 302 and the heat exchange plates on the corresponding sides are bonded and fixed by thermally conductive structural adhesive.

[0148] In some other embodiments of this application, the area above the first pull plate 301 and the area below the second pull plate 302 are both covers, and the first pull plate 301, the second pull plate 302 and the covers on the corresponding sides are bonded and fixed by thermally conductive structural adhesive.

[0149] Reference Figure 22 As shown, the electrical appliance 10000 according to the fourth aspect of this application includes the battery pack 100 of the above embodiment.

[0150] Reference Figure 23As shown, the electrical device 10000 according to the fourth aspect of this application includes the battery pack 1000 of the above embodiment.

[0151] Optionally, the electrical equipment 10000 can be vehicles, ships, airplanes, machine tools, household appliances, etc.

[0152] According to the embodiment of the present application, the electrical device 10000 has an end plate assembly 10 which, by setting the first wall 11 on the side of the second wall 12 near the battery cell 201 and connecting the first wall 11 and the second wall 12 through the connecting wall 13, can increase the structural strength of the first end plate 1, thereby increasing the restraining force of the first end plate 1 on the battery cell 201. In addition, the first end plate 1 and the second end plate 2 can be used together to bear the expansion force of the battery cell 201, so that the end plate assembly 10 can provide a sufficiently large restraining force on the battery cell 201.

[0153] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0154] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0155] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0156] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An end plate assembly (10) characterized by, The end plate assembly (10) is used to abut against the battery cell (201), and the end plate assembly (10) includes: A first end plate (1) comprising a first wall (11), a second wall (12), and a connecting wall (13), wherein the first wall (11) is spaced apart from the second wall (12) and connected by the connecting wall (13), and the first wall (11) is located on the side of the second wall (12) closer to the cell (201); and The second end plate (2) has a receiving space, and the first end plate (1) is at least partially located within the receiving space.

2. The end plate assembly (10) according to claim 1, characterized in that, At least part of the thickness of the first wall (11) is greater than the thickness of the second wall (12).

3. The end plate assembly (10) according to claim 1, characterized in that, The thickness of the first wall (11) is equal to the thickness of the second wall (12).

4. The end plate assembly (10) according to claim 1, characterized in that, At least part of the thickness of the first wall (11) is less than the thickness of the second wall (12).

5. The end plate assembly (10) according to any one of claims 1-4, characterized in that, The first wall (11) and the second wall (12) are spaced apart in a first direction, and there are multiple connecting walls (13). The multiple connecting walls (13) are spaced apart in a second direction. The first direction and the second direction are different directions.

6. The end plate assembly (10) according to claim 5, characterized in that, There are at least four connecting walls (13). In the second direction, from one end of the first end plate (1) to the other end, the distance between each two adjacent connecting walls (13) first decreases and then increases.

7. The end plate assembly (10) according to claim 5, characterized in that, There are at least three connecting walls (13), and in the second direction, the distance between any two adjacent connecting walls (13) is equal from one end of the first end plate (1) to the other end.

8. The end plate assembly (10) according to claim 5, characterized in that, Between any two adjacent connecting walls (13) is an end plate cavity (14), and the surfaces of the first wall (11) and / or the second wall (12) used to form the end plate cavity (14) are arched surfaces, which arch in a direction away from the end plate cavity (14).

9. The end plate assembly (10) according to claim 8, characterized in that, The end plate cavity (14) is multiple, and the radii of the arched surfaces of the multiple end plate cavities (14) are equal; or, There are at least three end plate cavities (14), and in the second direction, from one end of the first end plate (1) to the other end, the radius of the arched surface of the different end plate cavities (14) first decreases and then increases.

10. The end plate assembly (10) according to claim 5, characterized in that, In the second direction, the thickness of the first wall (11) and / or the second wall (12) has a thickness variation structure that is thicker in the middle and thinner at both ends.

11. The endplate assembly (10) according to claim 5, characterized in that, In the second direction, the first wall (11) and / or the second wall (12) have a uniform thickness structure.

12. The end plate assembly (10) according to claim 5, characterized in that, The surfaces of the first wall (11) and the second wall (12) that are opposite to each other are parallel to each other and are both planes.

13. The end plate assembly (10) according to claim 5, characterized in that, In the first direction, the second end plate (2) is provided with an opening toward the cell (201), and the first wall (11) protrudes from the opening.

14. The endplate assembly (10) according to claim 5, characterized in that, In the first direction, the cross-section of the second end plate (2) is a closed structure, and the first end plate (1) is disposed within the closed structure.

15. The endplate assembly (10) according to any one of claims 1-4, characterized in that, The structural strength of the first end plate (1) is less than that of the second end plate (2).

16. The endplate assembly (10) according to any one of claims 1-4, characterized in that, The first end plate (1) is an end plate made of one or more of the following materials: aluminum, aluminum alloy, copper, copper alloy, titanium alloy, zinc alloy, steel, silicone rubber, plastics, carbon fiber, and glass fiber; and / or, The material of the second end plate (2) is one or more of the following materials: aluminum, aluminum alloy, copper, copper alloy, titanium alloy, zinc alloy, steel, silicone rubber, plastic, carbon fiber, and glass fiber.

17. The endplate assembly (10) according to any one of claims 1-4, characterized in that, The dimensions of the first end plate (1) in the first direction range from 50mm to 200mm; and / or, The dimension of the first end plate (1) in the second direction ranges from 50mm to 1000mm; and / or, The dimensions of the first end plate (1) in the third direction range from 50mm to 500mm; Wherein, the first direction, the second direction, and the third direction are perpendicular to each other.

18. A battery pack (100), characterized in that, include: A battery cell assembly (20) comprising a plurality of battery cells (201) arranged in at least a first direction; and The end plate assembly (10) according to any one of claims 1-17, wherein the cell assembly (20) is provided with the end plate assembly (10) at at least one end in the first direction; A connector (30) abuts the end plate assembly (10) against the cell assembly (20).

19. The battery pack (100) according to claim 18, characterized in that, The battery cell assembly (20) has end plate assemblies (10) at both ends in the first direction, and the second end plates (2) at both ends of the battery cell assembly (20) are connected by the connector (30).

20. The battery pack (100) according to claim 19, characterized in that, The connector (30) includes a first pull plate (301) and a second pull plate (302), the first pull plate (301) and the second pull plate (302) are separated, the battery cell assembly (20) is located between the first pull plate (301) and the second pull plate (302), and each of the first pull plate (301) and the second pull plate (302) is connected to the second end plate (2) at both ends of the battery cell assembly (20).

21. The battery pack (100) according to claim 20, characterized in that, There are multiple first pull plates (301), and the multiple first pull plates (301) are arranged along the second direction; and / or, there are multiple second pull plates (302), and the multiple second pull plates (302) are arranged along the second direction.

22. The battery pack (100) according to any one of claims 18-21, characterized in that, The connector (30) is bonded and fixed to the battery cell (201).

23. The battery pack (100) according to claim 22, characterized in that, The battery pack (100) further includes a first adhesive strip (40), which is disposed between the connector (30) and the battery cell (201).

24. A battery pack (1000), characterized in that, The device includes a housing and a battery pack (100) according to any one of claims 18-23, wherein a receiving cavity is formed inside the housing and the battery pack (100) is disposed within the receiving cavity.

25. The battery pack (1000) according to claim 24, characterized in that, The connector (30) is bonded and fixed to the cavity wall of the receiving cavity.

26. The battery pack (1000) according to claim 25, characterized in that, The battery pack (1000) also includes a second adhesive strip (200), which is disposed between the connector (30) and the cavity wall of the receiving cavity.

27. An electrical appliance (10000), characterized in that, It includes the battery pack (100) according to any one of claims 18-23 or the battery pack (1000) according to any one of claims 24-26.

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