End plate, end plate assembly, and battery pack

Abstract

To provide an end plate, an end plate assembly, and a battery pack.SOLUTION: An end plate is applied to a battery pack. The battery pack includes a battery box. An inner wall of the battery box is provided with an insertion block. The end plate includes an end plate body. The end plate body has a first side wall and a second side wall disposed opposite to the first side wall. The first side wall is provided with a cell stack body abutting region. The second side wall is provided with a groove for insertion of the insertion block. The end plate body is provided with a first through hole. The groove is in communication with the first through hole.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application claims priority from a Chinese patent application filed with the China National Intellectual Property Administration on January 15, 2024, with application number 202420100087.9, and an international application filed with the China National Intellectual Property Administration on August 28, 2024, with application number PCT / CN2024 / 115167, and the entire contents of the above applications are incorporated herein by reference. This application relates to the field of battery technology, specifically to end plates, end plate assemblies, and battery packs.

Background Art

[0002] In the prior art, a battery pack includes a battery box and battery modules mounted inside the battery box. The battery module includes a cell stack body and an end plate assembly for fixing the cell stack body. The cell stack body includes a plurality of cells stacked in sequence. The end plate assembly includes an end plate and a binding band. End plates are installed at both ends of the cell stack direction. The binding band fixes the plurality of cells as a whole by binding the end plate and the cells. At the same time, the end plate is fixed to the battery box by screws to fix the cells inside the battery box.

Summary of the Invention

Problems to be Solved by the Invention

[0003] When the battery is applied to a vehicle, due to the poor flatness of the road surface, the battery is likely to be vibrated frequently. Therefore, after long-term use, the connection part between the screw and the battery box is likely to be deformed or broken, thereby reducing the connection reliability between the end plate and the battery box.

Means for Solving the Problems

[0004] In a first aspect, the disclosure provides an end plate. The end plate is applied to a battery pack, the battery pack includes a battery box, an insertion block is installed on the inner wall of the battery box, the end plate includes an end plate body, the end plate body has a first side wall and a second side wall installed opposite the first side wall, the first side wall has a cell stack contact area, the second side wall has a groove for inserting the insertion block, the end plate body has a first through hole, the groove communicates with the first through hole.

[0005] In a second aspect, the disclosure provides an end plate assembly comprising an end plate unit, the end plate unit comprising a cable tie and an end plate, wherein there are two end plates, the two end plates are spaced apart along the stacking direction of the cell, the ends of the cable tie are connected to form a ring, and the ends of the ring are each fitted onto the two end plates.

[0006] In a third aspect, the disclosure provides a battery pack comprising a battery box, cells, and an end plate assembly, wherein insertion blocks are installed on the inner wall of the battery box, a plurality of cells are stacked sequentially to form a cell stack, the end plate assembly is installed inside the battery box, the cell stack is installed between two end plates, and the insertion blocks are inserted into grooves. [Effects of the Invention]

[0007] This disclosure provides an end plate with a groove for inserting the battery box insertion block, thereby increasing the mating surface between the end plate and the battery box. Furthermore, when the battery box transmits vibrations to the end plate, the stress at the connection point between the battery box and the end plate is further distributed by the increased mating surface. This reduces the stress on the connection point between the end plate and the battery box and improves the reliability of the connection between the end plate and the battery box. [Brief explanation of the drawing]

[0008] [Figure 1] This is a structural diagram of an end plate provided by an embodiment of the present disclosure. [Figure 2] This is a magnified view of area A in Figure 1. [Figure 3] This is a cross-sectional view of line BB in Figure 2. [Figure 4] This figure shows the end plate and battery box assembled according to an embodiment of the present disclosure. [Figure 5] This is an enlarged view of area C in Figure 1. [Figure 6] This is a magnified view of area D in Figure 1. [Figure 7] This is a structural diagram of a part of the structure of an end plate provided by an embodiment of the present disclosure. [Figure 8] This is a structural diagram of an end plate assembly provided by an embodiment of the present disclosure. [Figure 9] This is a structural diagram showing the end plate assembly and cell stack body combined as provided in the embodiments of this disclosure. [Figure 10] This is a structural diagram of another end plate assembly provided by an embodiment of the present disclosure. [Figure 11] This is a magnified view of area E in Figure 10. [Figure 12] This is a structural diagram of a lock block provided by an embodiment of the present disclosure. [Modes for carrying out the invention]

[0009] Referring to Figure 1, which is a structural diagram of an end plate 011 provided by an embodiment of the present disclosure. The embodiment of the present disclosure provides an end plate 011. The end plate 011 is applied to a battery pack. The battery pack includes a battery box 004. An insertion block 041 is installed on the inner wall of the battery box 004. The end plate 011 includes an end plate body 111. The end plate body 111 has a first side wall 1111 and a second side wall 1112 installed opposite the first side wall 1111. A cell stack contact area is provided on the first side wall 1111. A groove 116 is provided on the second side wall 1112 for the insertion block 041 to be inserted. A first through hole 115 is provided on the end plate body 111. The groove 116 communicates with the first through hole 115. As shown in Figures 2 and 3, Figure 2 is an enlarged view of area A in Figure 1, and Figure 3 is a cross-sectional view of line BB in Figure 2.

[0010] It is understood that the first through hole 115 is located between the first side wall 1111 and the second side wall 1112. The cell stack contact area is the area on the end plate body 111 that contacts the cell stack 003. When the end plate 011 and the cell stack 003 are bound together using a cable tie 002, there are two end plates 011, each located at both ends of the cell stack. The ends of the cable tie 002 are connected to form a ring, and both ends of the ring are fitted onto the two end plates 011, securely binding the two end plates 011 and the cell stack 003.

[0011] Furthermore, after the end plate 011 and the cell stack are bound together, they must be placed in the battery box 004 and secured to the battery box 004 via the connecting member 043. The connecting member 043 is selectively a screw. Therefore, the insertion block 041 is provided with either a second through hole 411 or a screw hole 042. If the insertion block 041 is provided with a screw hole 042, the end of the screw rod passes through one end of the first through hole 115 and is then screwed into the screw hole 042. If the insertion block 041 is provided with a second through hole 411, the end of the screw rod passes through one end of the first through hole 115, the second through hole 411, and the other end of the first through hole 115 in sequence before being screwed into the battery box 004. As shown in Figure 4, Figure 4 is a diagram showing the end plate 011 and the battery box 004 combined according to an embodiment of the present disclosure.

[0012] For example, the end plate 011 is a metal plate, specifically aluminum alloy 6. The axis of the first through hole 115 is parallel to the axis of the cell. The end plate body 111 is provided with multiple first through holes 115 and multiple grooves 116, with the grooves 116 corresponding one-to-one to the multiple first through holes 115.

[0013] In this embodiment, by providing a groove 116 in the end plate 011 for inserting the battery box 004 insertion block 041, the mating surface between the end plate 011 and the battery box 004 is enlarged. Furthermore, when the battery box 004 transmits vibrations to the end plate 011, the stress at the connection point between the battery box 004 and the end plate 011 is further dispersed by the enlarged mating surface. This reduces the stress on the connection point between the end plate 011 and the battery box 004, and further improves the reliability of the connection between the end plate 011 and the battery box 004.

[0014] Referring to Figure 2, in one embodiment, the first through hole 115 is an oval-shaped hole.

[0015] In this embodiment, by making the first through hole 115 an oval hole, the position of the end plate 011 can be adjusted within the major diameter range of the oval hole with respect to the position of the hole in the battery box 004. The first through hole 115 is aligned with the corresponding hole in the battery box 004, so that the dimension chain matches, the assembly tolerance is satisfied, and furthermore, the convenience of assembling the end plate 011 to the battery box 004 can be improved, and the assembly quality can be improved.

[0016] Referring to FIG. 2, in one embodiment, a relief groove 1113 is provided in the end plate 011, and the bottom of the relief groove 1113 communicates with one end approaching the tip of the cell of the first through hole 115.

[0017] When the end plate 011 is fixed to the battery box 004 using screws, it is understood that the screws fit into the first through hole 115 and the heads of the screws are located outside the first through hole 115.

[0018] Exemplarily, the relief groove 1113 is provided at one end approaching the tip of the cell of the first through hole 115.

[0019] Based on this, in this embodiment, due to the above installation, the head of the screw will be located in the relief groove 1113. In this way, on the one hand, the height position of the screw can be lowered to avoid interference with members such as the upper cover of the battery box 004, and on the other hand, during assembly, it can be avoided that the head of the screw rubs against other members and damages other members.

[0020] Referring to FIG. 5, FIG. 5 is an enlarged view of the C part in FIG. 1. In one embodiment, the second side wall 1112 has a first edge 1114, and a chamfer 1115 is provided at the end of the first edge 1114. Here, the first edge 1114 is parallel to the axis of the cell. Moreover, chamfers 1115 are provided at both ends of the first edge 1114.

[0021] In this embodiment, the sharpness of the first edge 1114 can be eliminated by the above installation. This improves the load-bearing state at this point and avoids stress concentration, while also preventing the sharp portion from rubbing against other members.

[0022] Referring to Figure 5, in one embodiment, the chamfer 1115 is a rounded chamfer, and the radius of the chamfer 1115 gradually decreases along the direction approaching the end face of the first through hole 115.

[0023] In this embodiment, with the above-described installation, the dimensions of the first edge 1114 gradually decrease along the direction approaching the end face of the first through-hole 115. This is advantageous on the one hand for reducing the weight of the end plate 011, and on the other hand, it is possible to reduce the dimensions of one end of the end plate 011 that approaches the tip of the cell, thereby facilitating the arrangement of the battery's electrical components.

[0024] Refer to Figure 6, which is an enlarged view of location D in Figure 1. In one embodiment, a position-limiting structure 112 is installed on the second side wall 1112, and the position-limiting structure 112 includes two stopper ribs 1121, which are spaced apart along the axial direction of the cell.

[0025] The stopper rib 1121 is integrally molded with the end plate body 111, and it is understood that this integral molding can be done by casting or injection molding.

[0026] In this embodiment, by installing a position-limiting structure 112 on the surface of the end plate 011 that is away from the contact surface with the cell, both ends of the cable tie can be positioned by the position-limiting structure 112, thereby improving the consistency of the heights of both ends of the cable tie, and further ensuring that the binding force applied by the cable tie to the cell stack is parallel to the stacking direction of the cells. This avoids the generation of torque at both ends of the cell stack, thereby improving the consistency of both ends of the cell stack and further improving the integrity of the cell stack.

[0027] Referring to Figure 6, in one embodiment, the stopper rib 1121 has a third side wall 11211 that is separated from the first side wall 1111. An inclined surface 11212 is installed on the sides of the two stopper ribs 1121 that are separated from each other. Both ends of the inclined surface 11212 are connected to the second side wall 1112 and the third side wall 11211.

[0028] It is understood that the end plate 011 is installed inside the battery box and adjacent to the box wall. The electrical components of the battery pack are located above the end plate 011, for example, the battery pack shut-off unit. In order to prevent the stopper rib 1121 from approaching the end of the electrical components and damaging them, in this embodiment, with the above installation, one side of the stopper rib 1121 facing the electrical components of the battery becomes a slope 11212, thereby reducing the stress when the side of the stopper rib 1121 that approaches the electrical components contacts the electrical components, and further preventing the stopper rib 1121 from damaging the electrical components.

[0029] Furthermore, the above installation reduces the stress on the connection point between the two stopper ribs 1121 and the second side wall 1112 when thrust force is generated on the stopper rib 1121. This prevents damage to the connection point between the stopper rib 1121 and the second side wall 1112, and further improves the reliability of the end plate 011.

[0030] Referring to Figure 1, in one embodiment, there are multiple position-limiting structures 112. The multiple position-limiting structures 112 are installed sequentially on the second side wall along a direction perpendicular to the axis of the cell.

[0031] When the end plate 011 and the cell stack are fastened together with cable ties, it is understood that there are multiple stopper ribs 1121 on both sides of the cable tie.

[0032] In this embodiment, by installing multiple position-limiting structures 112, the positional stability of the cable tie located on the end plate 011 can be improved, and on the other hand, when the cable tie and the stopper rib 1121 are pressed together, the pressing force received by the cable tie can be distributed, thereby improving the force-receiving state of the cable tie and further extending the service life of the cable tie.

[0033] Referring to Figure 1, in one embodiment, there are multiple sets of position-limiting structures 112. The multiple sets of position-limiting structures 112 are installed at intervals along the axial direction of the cell. Each set of position-limiting structures 112 includes multiple position-limiting structures 112. The multiple position-limiting structures 112 in each set are installed sequentially along the second side wall in a direction perpendicular to the axis of the cell.

[0034] A single cell stack can be secured by arranging multiple cable ties; for example, a single cell stack can be secured by arranging two cable ties. The multiple cable ties are then spaced apart along the axial direction of the cell. Therefore, to improve the reliability of the cable ties, multiple sets of position-limiting structures 112 are installed on the end plate body 111 to position each cable tie, thereby improving the positional accuracy of each cable tie so that the binding force applied by each cable tie to the cell stack is parallel to the stacking direction of the cell.

[0035] Referring to Figure 7, which is a structural diagram of a part of the structure of the end plate 011 provided by an embodiment of the present disclosure. In one embodiment, a weight-reducing hole 113 is provided in the first side wall 1111.

[0036] In this embodiment, the weight of the end plate 011 can be reduced by installing weight-reducing holes 113 in the first side wall 1111. Thus, on the one hand, the amount of material used for the end plate 011 can be reduced, thereby reducing the material cost of the end plate 011, and on the other hand, the weight of the end plate 011 can be reduced, thereby reducing the weight of the battery pack, which is advantageous for reducing the weight of the battery pack.

[0037] Referring to Figure 7, in one embodiment, a reinforcing plate is installed in the lightweight hole 113. Both sides of the reinforcing plate are connected to the hole walls of the lightweight hole 113.

[0038] In this embodiment, the strength of the end plate module can be increased by installing a reinforcing plate, thereby improving the reliability of the end plate 011.

[0039] Referring to Figure 7, in one embodiment, the weight reduction hole 113 is a rectangular hole. The reinforcing plate includes diagonal reinforcing plates 1141. There are two diagonal reinforcing plates 1141. The two diagonal reinforcing plates 1141 are installed intersecting each other. One diagonal reinforcing plate 1141 is connected to a pair of diagonals in the weight reduction hole 113, and the other diagonal reinforcing plate 1141 is connected to another pair of diagonals in the weight reduction hole 113.

[0040] It can be understood that both ends of one diagonal reinforcing plate 1141 are connected to a pair of opposing diagonal locations of the lightweight holes 113, and both ends of another diagonal reinforcing plate 1141 are connected to another pair of opposing diagonal locations of the lightweight holes 113.

[0041] In this embodiment, the above installation allows the pressure on one side of the end plate 011 to be uniformly distributed to the opposite side via the two diagonal reinforcing plates 1141. This improves the force-bearing condition of the end plate 011, thereby improving the reliability of the end plate 011.

[0042] In one embodiment, the reinforcing plate further includes a vertical reinforcing plate 1142 and a horizontal reinforcing plate 1143, and the vertical reinforcing plate 1142, the horizontal reinforcing plate 1143 and the diagonal reinforcing plate 1141 are installed intersecting each other.

[0043] In this embodiment, the above installation makes it possible to increase the strength of the end plate module and improve the reliability of the end plate 011, and on the other hand, by further distributing the force received by the end plate 011, the force-receiving state of the end plate 011 is improved and the reliability of the end plate 011 is further improved.

[0044] In this embodiment, the groove 116 is located in the middle of the second side wall 1112, and both of the two opposing side walls of the groove 116 communicate with the first through hole 115, and / or the groove 116 is located at the end of the second side wall 1112, and the groove 116 communicates with the end of the first through hole 115.

[0045] Selectively, tanks 116 are installed at both ends of the first edge 1112.

[0046] Here, by placing the groove 116 in the middle of the second side wall 1112, the force receiving of the end plate 011 can be positioned at the center of the end plate 011, thereby improving the force receiving state of the end plate 011 and further improving the reliability of the connection between the end plate 011 and the battery box.

[0047] Furthermore, by providing the groove 116 at the end of the second side wall 1112, the end of the end plate 011 can be fixed to the battery box, thereby avoiding warping of the end of the end plate 011 due to machining errors and further improving the reliability of the connection between the end plate 011 and the battery box. In one embodiment, the first side wall 1111 is provided with at least two cell stack contact areas, so that the end plate can contact at least two cell stacks.

[0048] Here, the cell stack contact regions are placed on the first side wall 1111 so as to be distributed in a matrix.

[0049] In this embodiment, by bringing two or more cell stacks into contact with one end plate 011, the assembly process can be simplified and assembly efficiency can be improved, while the positional accuracy between the two cell stacks can be improved, thereby reducing the assembly tolerance between the cell stacks.

[0050] Referring to Figure 8, which is a structural diagram of an end plate assembly 001 provided by an embodiment of the present disclosure. Correspondingly, embodiments of the present disclosure further provide an end plate assembly 001. The end plate assembly 001 includes an end plate unit, which includes a cable tie 002 and an end plate 011 provided by some embodiments of the present disclosure. There are two end plates 011. The two end plates 011 are spaced apart along the stacking direction of the cells. The ends of the cable tie 002 are connected to form a ring. The ends of the ring are each fitted onto the two end plates 011. Specifically, the cable tie 002 is located between two stopper ribs 1121.

[0051] For example, the cable tie 002 is a steel strip.

[0052] Here, when the first side wall is used to contact the two cell stacks 003, Figure 9 shows a structural diagram of the end plate assembly 001 and the cell stacks 003 fitted together, as provided by an embodiment of the present disclosure. In Figure 9, the cable tie 002 fits the two cell stacks 003 inside each other.

[0053] In this embodiment, by using the end plate 011 provided in some embodiments of the present disclosure, the stress on the connection portion between the end plate 011 and the battery box 004 can be reduced, and the reliability of the connection between the end plate 011 and the battery box 004 can be further improved.

[0054] Furthermore, in this embodiment, both ends of the cable tie 002 can be positioned by the position-limiting structure 112, thereby improving the consistency of the heights of both ends of the cable tie 002, and further ensuring that the binding force applied by the cable tie 002 to the cell stack body is parallel to the stacking direction of the cells. This avoids the generation of torque at both ends of the cell stack body, thereby improving the consistency of both ends of the cell stack body and further improving the integrity of the cell stack body.

[0055] Referring to Figure 10, which is a structural diagram of another end plate 011 assembly provided by an embodiment of the present disclosure. In one embodiment, the end plate 011 assembly further includes a lock block 012. There are two end plate units. The two end plate units are installed in parallel, with two end plates 011 in one end plate unit and two end plates 011 in the other end plate unit in a one-to-one correspondence. A lock block 012 is installed between each of the two corresponding end plates 011. Both ends of the lock block 012 are detachably connected to two end plate bodies 111.

[0056] For example, the lock block 012 is connected to the end plate body 111 via a screw.

[0057] In this embodiment, by installing two end plate units in parallel and detachably connecting the two end plate units through the lock block 012, it is easy to improve the relative positional accuracy of the cells of the two end plate units, which is advantageous for the placement and electrical connection of subsequent collection units. Furthermore, the connection between the two end plate units can be quickly released through the lock block 012, improving the convenience of maintenance.

[0058] Referring to Figures 11 and 12, Figure 11 is an enlarged view of location E in Figure 10, and Figure 12 is a structural diagram of the lock block 012 provided by an embodiment of the present disclosure. In one embodiment, the lock block 012 is provided with a V-shaped groove 121, and the groove walls on both sides of the V-shaped groove 121 abut against two adjacent side walls of the end plate 011 body.

[0059] It is understood that both ends of the V-shaped groove 121 are fitted to the two end plate bodies 111, respectively, along the direction of arrangement of the two end plate bodies 111.

[0060] In this embodiment, the above installation makes it easy to quickly position the lock block 012 on the end plate body 111 by fitting the groove walls on both sides of the V-shaped groove 121 with the end plate body 111, thereby improving the convenience of installing the lock block 012. On the other hand, by engaging the lock block 012 with the end plate body 111, the strength of the connection part between the two end plate bodies 111 is increased, and the vibration resistance of the connection part between the two end plate units is further improved.

[0061] Referring to Figure 12, in one embodiment, the lock block 012 is connected to the end plate 011 body through a connecting member 043, and the connecting member 043 is selectively a screw. The hole in the lock block 012 that fits with the connecting member 043 is a bolt through hole 122, and the bolt through hole 122 is an oval hole.

[0062] In this embodiment, by making the bolt through-hole 122 an oval-shaped hole, the position of the lock block 012 can be adjusted within the major axis range of the oval-shaped hole relative to the position of the hole on the end plate 011. The bolt through-hole 122 is aligned with the corresponding hole on the end plate 011, thereby matching the dimensional chain, satisfying assembly tolerances, and further improving the convenience of assembling the lock block 012 to the end plate 011, thereby improving assembly quality.

[0063] Referring to Figure 11, in one embodiment, the lock block 012 is connected to the end plate 011 body through a connecting member 043, and the connecting member 043 is selectively a screw. The hole in the end plate body 111 that aligns with the screw is the first through hole 115.

[0064] In this embodiment, the above-described installation allows a single screw to be used to fix the lock block 012 and to fix the end plate 011 to the battery box. Thus, on the one hand, the lock block 012 and the end plate 011 can be fixed simultaneously with a single screw, thereby reducing the number of screws and improving the structural compactness of the end plate assembly. On the other hand, based on the reduction in the number of screws, the number of holes in the end plate 011 that match the screws can be reduced, thereby ensuring the strength of the end plate 011 and simplifying the manufacturing steps for the end plate 011.

[0065] Accordingly, embodiments of the present disclosure further provide a battery pack comprising a battery box 004, cells, and an end plate assembly 001 provided in some embodiments of the present disclosure. An insertion block 041 is installed on the inner wall of the battery box 004. Multiple cells are stacked sequentially to form a cell stack 003. The end plate assembly 001 is installed inside the battery box 004. The cell stack 003 is installed between two end plates 011. The insertion block 041 is inserted into a groove 116.

[0066] In this embodiment, by employing the end plate assembly 001 provided in some embodiments of the present disclosure, the insertion block 041 of the battery box 004 is inserted into the groove 116 of the end plate 011, thereby enlarging the mating surface between the end plate 011 and the battery box 004. Furthermore, when the battery box 004 transmits vibrations to the end plate 011, the stress at the connection point between the battery box 004 and the end plate 011 is further dispersed by the enlarged mating surface. This reduces the stress on the connection point between the end plate 011 and the battery box 004, and further improves the reliability of the battery pack. [Explanation of Symbols]

[0067] 001: End plate assembly 011: End plate 111: End plate body 1111: First side wall 1112: Second side wall 1113: Escape ditch 1114: First Edge 1115: Rounded chamfer 112: Position-limited structure 1121: Stopper Rib 11211: Third side wall 11212: Slope 113: Lightweight holes 1141: Diagonal reinforcing plate 1142: Vertical reinforcing plate 1143: Horizontal reinforcement plate 115:1st hole 116: Groove 012: Rock Block 121:V-shaped groove 122: Bolt through hole 002: Cable ties 003: Cell stack 004:Battery box 041: Insertion block 411:Second through hole 042: Screw hole 043: Connecting member

Claims

1. An end plate (011), An end plate characterized in that the end plate (011) is applied to a battery pack, the battery pack includes a battery box (004), an insertion block (041) is installed on the inner wall of the battery box (004), the end plate (011) includes an end plate body (111), the end plate (011) body has a first side wall (1111) and a second side wall (1112) installed opposite to the first side wall (1111), the first side wall (1111) has a cell stack contact area, the second side wall (1112) has a groove (116) for inserting the insertion block (041), the end plate (011) body has a first through hole (115), and the groove (116) communicates with the first through hole (115).

2. The end plate according to claim 1, characterized in that the first through hole (115) is an oval-shaped hole.

3. The end plate according to claim 1, characterized in that the end plate (011) is provided with a relief groove (1113), and the bottom of the relief groove (1113) communicates with one end of the first through hole (115).

4. The end plate according to claim 1, characterized in that the second side wall (1112) has a first edge (1114), and a chamfer (1115) is provided at the end of the first edge (1114).

5. The end plate according to claim 4, characterized in that the chamfer (1115) is a round chamfer (1115), and the radius of the chamfer (1115) gradually decreases along the direction approaching the end face of the first through hole (115).

6. The end plate according to claim 1, characterized in that a position-limiting structure (112) is provided on the second side wall (1112), the position-limiting structure (112) includes two stopper ribs (1121), and the two stopper ribs (1121) are spaced apart along the axial direction of the cell.

7. The end plate according to claim 6, characterized in that the stopper rib (1121) has a third side wall (11211) that is separated from the first side wall (1111), and slopes (11212) are provided on the sides of the two stopper ribs (1121) that are separated from each other, and both ends of the slopes (11212) are connected to the second side wall (1112) and the third side wall (11211).

8. The end plate according to claim 1, characterized in that the first side wall (1111) is provided with a weight-reducing hole (113).

9. The end plate according to claim 8, characterized in that a reinforcing plate is installed in the lightweight hole (113), both sides of the reinforcing plate are connected to the hole wall of the lightweight hole (113), the reinforcing plate includes an oblique reinforcing plate (1141), a vertical reinforcing plate (1142), and a horizontal reinforcing plate (1143), there are two oblique reinforcing plates (1141), the two oblique reinforcing plates (1141) are installed intersecting each other, one oblique reinforcing plate (1141) is connected to a pair of two diagonals in the lightweight hole (113), the other oblique reinforcing plate (1141) is connected to another pair of two diagonals in the lightweight hole (113), and the vertical reinforcing plate (1142), the horizontal reinforcing plate (1143), and the oblique reinforcing plate (1141) are installed intersecting each other.

10. The groove (116) is located in the middle of the second side wall (1112), and both of the two opposing side walls of the groove (116) communicate with the first through hole (115). The end plate according to claim 1, characterized in that the groove (116) is installed at the end of the second side wall (1112) and the groove (116) communicates with the end of the first through hole (115).

11. The end plate according to claim 1, characterized in that at least two cell stack body (003) contact areas are provided on the first side wall (1111).

12. An end plate assembly (001), The end plate assembly (001) includes an end plate unit, The end plate unit includes an end plate (011) according to any one of claims 1 to 11 and a cable tie (002), There are two end plates (011), and the two end plates (011) are installed with an interval between them along the stacking direction of the cell. An end plate assembly characterized in that both ends of the cable tie (002) are connected to form a ring, and both ends of the ring are fitted onto two end plates (011).

13. The end plate assembly according to claim 12, wherein the end plate assembly (001) further includes a lock block (012), there are two end plate units, the two end plate units are installed in parallel, and two end plates (011) in one end plate unit are installed in a one-to-one correspondence with two end plates (011) in the other end plate unit, the lock block (012) is installed between each of the two corresponding end plates (011), and both ends of the lock block (012) are detachably connected to the two end plate (011) bodies, respectively.

14. The end plate assembly according to claim 13, characterized in that a V-shaped groove (121) is provided in the lock block (012), and the groove walls on both sides of the V-shaped groove (121) abut against two adjacent side walls of the end plate (011) body.

15. The end plate assembly according to claim 13, characterized in that the lock block (012) is connected to the end plate (011) body through a connecting member (043), and the hole in the lock block (012) that fits with the connecting member (043) is an oval-shaped hole.

16. The end plate assembly according to claim 13, characterized in that the lock block (012) is connected to the end plate (011) body through a connecting member (043), and the hole in the end plate (011) body that fits with the connecting member (043) is the first through hole (115).

17. It is a battery pack, The battery box (004), a plurality of cells, and the end plate assembly (001) described in claim 12, An insertion block (041) is installed on the inner wall of the battery box (004). The plurality of cells are stacked sequentially to form a cell stack. A battery pack characterized in that the end plate assembly (001) is installed inside the battery box (004), the cell stack is installed between the two end plates (011), and the insertion block (041) is inserted into the groove (116).

Images