End plate, end plate assembly and battery pack

Abstract

An end plate (011), an end plate assembly (001) and a battery pack. The end plate (011) is applied to the battery pack. The battery pack comprises a battery case (004), wherein an insertion block (041) is provided on an inner wall of the battery case (004). The end plate (011) comprises an end plate body (111), wherein the end plate body (111) is provided with a first side wall (1111) and a second side wall (1112) which are arranged opposite to each other. The first side wall (1111) is provided with an abutting area for a battery cell stack (003), and the second side wall (1112) is provided with a snap-fit slot (116) for insertion of the insertion block (041). The end plate body (111) is provided with a first through hole (115), the snap-fit slot (116) being in communication with the first through hole (115).

Description

End plates, end plate assemblies and battery packs

[0001] This application claims priority to Chinese patent application No. 202420100087.9 filed with the Patent Office of China on January 15, 2024. The entire contents of the above application are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to an end plate, an end plate assembly and a battery pack. Background Art

[0003] In related art, a battery includes a battery box and a battery module mounted within the box. The battery module includes a cell stack and an end plate assembly that secures the cell stack. The cell stack comprises a plurality of sequentially stacked cells. The end plate assembly includes end plates and cable ties. End plates are positioned at both ends of the stacking direction of the cells. The cable ties bind the end plates and cells together to secure the cells as a single unit. The end plates are screwed into the battery box, securing the cells within the box. SUMMARY OF THE INVENTION

[0004] When batteries are used in vehicles, they are frequently subjected to vibration due to poor road surface roughness. This can easily cause the connection between the screws and the battery box to deform or even break over time, leading to poor connection reliability between the end plate and the battery box.

[0005] In the first aspect, the present application provides an end plate, which is applied to a battery pack, the battery pack including a battery box, the inner wall of which is provided with an insert block; the end plate includes an end plate body, the end plate body having a first side wall and a second side wall arranged opposite to each other, the first side wall being provided with a cell stack abutment area, the second side wall being provided with a card slot for inserting the insert block, and the end plate body being provided with a first through hole card slot connected to the first through hole.

[0006] In the second aspect, the present application provides an end plate assembly, which includes an end plate unit, the end plate unit includes a cable tie and the aforementioned end plate, there are two end plates, and the two end plates are arranged at intervals along the stacking direction of the battery cells; the cable tie is connected at both ends to form a ring body, and the two ends of the ring body are respectively mounted on the two end plates.

[0007] On the third aspect, the present application provides a battery pack, which includes a battery box, battery cells and the aforementioned end plate assembly, wherein the inner wall of the battery box is provided with an insert block; a plurality of battery cells are stacked in sequence to form a battery cell stack; the end plate assembly is arranged in the battery box, the battery cell stack is arranged between the two end plates, and the insert block is inserted into the card slot. Beneficial effects

[0008] This application provides a slot on the end plate for inserting the plug on the battery box, thereby increasing the mating surface between the end plate and the battery box. This allows for more dispersed force at the connection between the battery box and the end plate when the battery box transmits vibrations to the end plate. This reduces stress at the connection between the end plate and the battery box, thereby improving the reliability of the connection between the end plate and the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic structural diagram of an end plate provided in an embodiment of the present application;

[0010] Figure 2 is an enlarged view of point A in Figure 1;

[0011] FIG3 is a cross-sectional view taken along line BB in FIG2 ;

[0012] FIG4 is a schematic diagram of the cooperation between the end plate and the battery box provided in an embodiment of the present application;

[0013] Figure 5 is an enlarged view of point C in Figure 1;

[0014] FIG6 is an enlarged view of point D in FIG1 ;

[0015] FIG7 is a schematic structural diagram of a portion of the end plate provided in an embodiment of the present application;

[0016] FIG8 is a schematic structural diagram of an end plate assembly provided in an embodiment of the present application;

[0017] FIG9 is a schematic structural diagram of the end plate assembly and the battery cell stack provided in an embodiment of the present application;

[0018] FIG10 is a schematic structural diagram of another end plate assembly provided in an embodiment of the present application;

[0019] FIG11 is an enlarged view of point E in FIG10 ;

[0020] FIG12 is a schematic structural diagram of a locking block provided in an embodiment of the present application.

[0021] Description of reference numerals:

[0022] 001-end plate assembly;

[0023] 011-end plate; 111-end plate body; 1111-first side wall; 1112-second side wall; 1113-clearance groove; 1114-first edge; 1115-chamfer; 112-limiting structure; 1121-retaining rib; 11211-third side wall; 11212-inclined surface; 113-weight-reducing hole; 1141-inclined reinforcement plate; 1142-longitudinal reinforcement plate; 1143-transverse reinforcement plate; 115-first through hole; 116-slot;

[0024] 012-locking block; 121-V-slot; 122-bolt hole;

[0025] 002-cable tie;

[0026] 003-battery cell stack;

[0027] 004-battery box; 041-insert block; 411-second through hole; 042-threaded hole; 043-connector. Modes for Carrying Out the Invention

[0028] Please refer to Figure 1, which is a structural schematic diagram of the end plate 011 provided in an embodiment of the present application. An embodiment of the present application provides an end plate 011. The end plate 011 is applied to a battery pack. The battery pack includes a battery box 004. The inner wall of the battery box 004 is provided with an insert 041. 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 arranged opposite to each other. The first side wall 1111 is provided with a cell stack abutment area. The second side wall 1112 is provided with a card slot 116 for inserting the insert 041. The end plate body 111 is provided with a first through hole 115. The card slot 116 is connected to the first through hole 115, as shown in Figures 2 and 3, Figure 2 is an enlarged view of point A in Figure 1, and Figure 3 is a cross-sectional view of BB in Figure 2.

[0029] It can be understood that first through-hole 115 is located between first sidewall 1111 and second sidewall 1112. The cell stack abutment area is the area on end plate body 111 that abuts against cell stack 003. When using cable ties 002 to bind end plate 011 and cell stack 003 together, two end plates 011 are provided, one at each end of the stacked cells. Cable ties 002 are connected end to end to form a ring, with the ends of the ring being placed over the two end plates 011 to securely bind the two end plates 011 and cell stack 003.

[0030] In addition, after the end plate 011 and the stacked battery cells are bound together, they need to be placed in the battery box 004 and fixed in the battery box 004 by the connector 043. The connector 043 can optionally be a screw. Therefore, a second through hole 411 or a threaded hole 042 is provided on the plug block 041. When the threaded hole 042 is provided on the plug block 041, the end of the rod of the screw passes through one end of the first through hole 115 and is threadedly connected to the threaded hole 042. When the second through hole 411 is provided on the plug block 041, the end of the rod of the screw 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 and is threadedly connected to the battery box 004, as shown in Figure 4, which is a schematic diagram of the end plate 011 and the battery box 004 provided in an embodiment of the present application.

[0031] Exemplarily, the end plate 011 is a metal plate, specifically 6-series aluminum. Furthermore, the axis of the first through-hole 115 is parallel to the axis of the battery cell. The end plate body 111 is provided with a plurality of first through-holes 115 and a plurality of slots 116 , with the slots 116 corresponding to the plurality of first through-holes 115 .

[0032] In this embodiment, by providing a slot 116 on the end plate 011 for inserting the insert block 041 on the battery box 004, the mating surface between the end plate 011 and the battery box 004 is increased. Consequently, when the battery box 004 transmits vibrations to the end plate 011, the force acting on the connection between the battery box 004 and the end plate 011 is more dispersed due to the increased mating surface. This reduces the stress on the connection between the end plate 011 and the battery box 004, thereby improving the reliability of the connection between the end plate 011 and the battery box 004.

[0033] Please refer to FIG. 2 . In one embodiment, the first through hole 115 is a waist-shaped hole.

[0034] In this embodiment, by setting the first through hole 115 as a waist-shaped hole, the position of the end plate 011 can be adjusted relative to the position of the hole on the battery box 004 within the long diameter range of the waist-shaped hole, so that the first through hole 115 is aligned with the corresponding hole on the battery box 004, thereby matching the dimension chain and meeting the assembly tolerance, thereby improving the convenience of assembling the end plate 011 to the battery box 004 and improving the assembly quality.

[0035] Please refer to FIG. 2 . In one embodiment, a clearance groove 1113 is provided on the end plate 011 . The bottom of the clearance groove 1113 is connected to an end of the first through hole 115 close to the top of the battery cell.

[0036] It can be understood that when the end plate 011 is fixed in the battery box 004 using screws, the screws cooperate with the first through holes 115 , and the heads of the screws are located outside the first through holes 115 .

[0037] Exemplarily, the clearance groove 1113 is provided at an end of the first through hole 115 close to the top of the battery cell.

[0038] Based on this, in this embodiment, the above arrangement allows the screw head to be located in the clearance groove 1113. This, on the one hand, reduces the height of the screw to avoid interference with components such as the upper cover of the battery box 004; on the other hand, it prevents the screw head from scratching other components during assembly, thereby damaging them.

[0039] Please refer to Figure 5, which is an enlarged view of point C in Figure 1. In one embodiment, the second sidewall 1112 has a first edge 1114, and an end of the first edge 1114 is provided with a chamfer 1115.

[0040] The first edge 1114 is parallel to the axis of the battery cell.

[0041] In addition, chamfers 1115 are provided at both ends of the first edge 1114 .

[0042] In this embodiment, the above arrangement can remove the sharpness of the first edge 1114. This can improve the stress state there and avoid stress concentration; on the other hand, it can prevent the sharp edge from scratching other parts.

[0043] Please refer to FIG. 5 . In one embodiment, the chamfer 1115 is a rounded chamfer, and the radius of the chamfer 1115 gradually decreases along a direction approaching the end surface of the first through hole 115 .

[0044] In this embodiment, the above arrangement allows the first edge 1114 to gradually decrease in size as it approaches the end surface of the first through hole 115. This not only helps reduce the weight of the end plate 011, but also allows the end of the end plate 011 near the top of the battery cell to be smaller, facilitating the arrangement of the battery's electrical components.

[0045] Please refer to Figure 6, which is an enlarged view of point D in Figure 1. In one embodiment, the second sidewall 1112 is provided with a limiting structure 112, which includes two retaining ribs 1121, which are spaced apart along the axial direction of the battery cell.

[0046] It can be understood that the retaining rib 1121 and the end plate body 111 are integrally formed, and can be integrally formed by injection molding or casting.

[0047] In this embodiment, a retaining structure 112 is provided on the surface of the end plate 011 facing away from the contact with the battery cells, so that the ends of the cable tie can be positioned by the retaining structure 112. This improves the height consistency of the ends of the cable tie, thereby ensuring that the binding force applied by the cable tie to the battery cell stack is parallel to the stacking direction of the battery cells. This prevents the generation of torque at the ends of the battery cell stack, thereby improving the consistency of the ends of the battery cell stack and further improving the neatness of the battery cell stack.

[0048] Please refer to Figure 6. In one embodiment, the retaining rib 1121 has a third sidewall 11211 facing away from the first sidewall 1111. The two retaining ribs 1121 are provided with inclined surfaces 11212 on opposite sides of each other. The two ends of the inclined surfaces 11212 are connected to the second sidewall 1112 and the third sidewall 11211.

[0049] As will be understood, end plate 011 is disposed within the battery box and adjacent to the box wall. The battery pack's electrical components, such as the battery pack's circuit breaker unit, are located above end plate 011. To prevent the end of retaining rib 1121 proximal to the electrical components from scratching the components, in this embodiment, the side of retaining rib 1121 facing the battery's electrical components is provided with a sloped surface 11212. This reduces the stress on the side of retaining rib 1121 proximal to the electrical components, thereby preventing retaining rib 1121 from scratching the components.

[0050] In addition, through the above-mentioned arrangement, when the cable tie generates a thrust on the retaining rib 1121, the stress on the connection portion between the two retaining ribs 1121 on their opposite sides and the second side wall 1112 can be reduced, thereby avoiding damage to the connection portion between the retaining rib 1121 and the second side wall 1112, and further improving the reliability of the end plate 011.

[0051] 1 , in one embodiment, there are a plurality of limiting structures 112. The plurality of limiting structures 112 are sequentially arranged on the second side wall along a direction perpendicular to the axis of the battery cell.

[0052] It can be understood that when the cable tie is used to bind the end plate 011 and the battery cell stack, there are multiple retaining ribs 1121 on both sides of the cable tie.

[0053] In this embodiment, by providing a plurality of limiting structures 112, on the one hand, the position stability of the cable tie on the end plate 011 can be improved; on the other hand, when the cable tie is squeezed with the retaining rib 1121, the extrusion force on the cable tie can be dispersed, thereby improving the stress state of the cable tie and further increasing the service life of the cable tie.

[0054] Referring to FIG. 1 , in one embodiment, there are multiple groups of retaining structures 112 . The multiple groups of retaining structures 112 are spaced apart along the axial direction of the battery cell. Each group of retaining structures 112 includes multiple retaining structures 112 . The multiple retaining structures 112 in each group are sequentially arranged on the second sidewall in a direction perpendicular to the axis of the battery cell.

[0055] It is understood that a single cell stack can be secured with multiple cable ties, for example, two cable ties. The multiple cable ties are spaced apart along the axial direction of the cells. Therefore, to improve the reliability of the cable tie binding, multiple sets of limiting structures 112 are provided on the end plate body 111 to limit the position of each cable tie, thereby improving the positioning accuracy of each cable tie and ensuring that the binding force applied by each cable tie to the cell stack is parallel to the stacking direction of the cells.

[0056] Please refer to Figure 7, which is a schematic diagram of a portion of the end plate 011 provided in an embodiment of the present application. In one embodiment, a weight-reducing hole 113 is provided on the first side wall 1111.

[0057] In this embodiment, the weight of the end plate 011 can be reduced by providing the weight-reducing holes 113 on the first side wall 1111. This, on the one hand, reduces the material usage of the end plate 011, thereby reducing the material cost of the end plate 011; on the other hand, it reduces the weight of the end plate 011, thereby reducing the weight of the battery pack, thereby facilitating lightweighting of the battery pack.

[0058] 7 , in one embodiment, a reinforcing plate is disposed in the weight-reducing hole 113 , with two sides of the reinforcing plate connected to the hole wall of the weight-reducing hole 113 .

[0059] In this embodiment, by providing a reinforcing plate, the strength of the end plate module can be improved, thereby improving the reliability of the end plate 011.

[0060] Referring to FIG. 7 , in one embodiment, the weight-reducing hole 113 is a rectangular hole. The reinforcement plate includes two oblique reinforcement plates 1141 . The two oblique reinforcement plates 1141 are intersectingly disposed. The two oblique reinforcement plates 1141 are respectively connected to two pairs of diagonal corners of the weight-reducing hole 113 .

[0061] It can be understood that the two ends of one inclined reinforcing plate 1141 are respectively connected to a pair of oppositely set diagonals of the weight-reducing hole 113 , and the two ends of the other inclined reinforcing plate 1141 are respectively connected to another pair of oppositely set diagonals of the weight-reducing hole 113 .

[0062] In this embodiment, the above arrangement allows the pressure on either side of the end plate 011 to be evenly distributed to the opposite side via the two oblique reinforcement plates 1141. This improves the stress state of the end plate 011 and enhances its reliability.

[0063] In one embodiment, the reinforcing plate further includes a longitudinal reinforcing plate 1142 and a transverse reinforcing plate 1143 , and the longitudinal reinforcing plate 1142 , the transverse reinforcing plate 1143 and the oblique reinforcing plate 1141 are intersectingly arranged.

[0064] In this embodiment, by setting the above-mentioned settings, on the one hand, the strength of the end plate module can be improved, thereby improving the reliability of the end plate 011; on the other hand, the force on the end plate 011 can be more dispersed, thereby improving the stress state of the end plate 011 and further improving the reliability of the end plate 011.

[0065] In one embodiment, the slot 116 is provided in the middle of the second side wall 1112, and the two opposite side walls of the slot 116 are both connected to the first through hole 115; and / or, the slot 116 is provided at the end of the second side wall 1112, and the slot 116 is connected to the end of the first through hole 115.

[0066] Optionally, a slot 116 is provided at both ends of the second side wall 1112 .

[0067] Among them, setting the card slot 116 in the middle of the second side wall 1112 can make the end plate 011 bear the force at the center of the end plate 011, thereby improving the stress state of the end plate 011 and further improving the connection reliability between the end plate 011 and the battery box.

[0068] Furthermore, the positioning of the latching slot 116 at the end of the second side wall 1112 secures the end of the end plate 011 relative to the battery case, thereby preventing the end of the end plate 011 from tilting due to machining errors, thereby improving the connection reliability between the end plate 011 and the battery case. In one embodiment, the first side wall 1111 is provided with at least two cell stack abutment areas, so that the end plate is used to abut at least two cell stacks.

[0069] The battery cell stack contact areas are distributed in a matrix on the first side wall 1111 .

[0070] In this embodiment, by contacting more than two battery cell stacks with one end plate 011, on the one hand, the assembly steps can be simplified and the assembly efficiency can be improved; on the other hand, the position accuracy between the two battery cell stacks can be improved, thereby reducing the assembly tolerance between the battery cell stacks.

[0071] Please refer to Figure 8, which is a structural schematic diagram of the end plate assembly 001 provided in an embodiment of the present application. Correspondingly, an embodiment of the present application also provides an end plate assembly 001. The end plate assembly 001 includes an end plate unit, and the end plate unit includes a cable tie 002 and an end plate 011 provided in some embodiments of the present application. There are two end plates 011. The two end plates 011 are spaced apart along the stacking direction of the battery cells. The cable tie 002 is connected end to end to form a ring body. The two ends of the ring body are respectively mounted on the two end plates 011. Specifically, the cable tie 002 is located between the two retaining ribs 1121.

[0072] Exemplarily, the cable tie 002 is a steel strap.

[0073] The first sidewall 1111 is used to contact the two battery cell stacks 003, as shown in Figure 9, which is a schematic diagram of the structure of the end plate assembly 001 and the battery cell stack 003 provided in an embodiment of the present application. In Figure 9, the cable tie 002 is placed inside the two battery cell stacks 003.

[0074] In this embodiment, by adopting the end plate 011 provided in some embodiments of the present application, the stress on the connection portion between the end plate 011 and the battery box 004 can be reduced, thereby improving the connection reliability between the end plate 011 and the battery box 004.

[0075] Furthermore, in this embodiment, the ends of the cable tie 002 can be positioned by the limiting structure 112, thereby improving the height consistency of the ends of the cable tie 002, thereby ensuring that the binding force applied by the cable tie 002 to the battery cell stack is parallel to the stacking direction of the battery cells. This prevents the generation of torque at the ends of the battery cell stack, thereby improving the consistency of the ends of the battery cell stack and further improving the neatness of the battery cell stack.

[0076] Please refer to Figure 10, which is a structural schematic diagram of another end plate 011 assembly provided by an embodiment of the present application. In one embodiment, the end plate 011 assembly further includes a locking block 012. There are two end plate units. The two end plate units are arranged in parallel, and the two end plates 011 of one end plate unit are arranged in a one-to-one correspondence with the two end plates 011 of the other end plate unit. A locking block 012 is provided between the two corresponding end plates 011. The two ends of the locking block 012 are respectively detachably connected to the two end plate bodies 111.

[0077] Exemplarily, the locking block 012 is connected to the end plate body 111 via screws.

[0078] In this embodiment, by arranging the two end plate units side by side and detachably connecting the two end plate units through the locking block 012, it is convenient to improve the relative position accuracy of the battery cells of the two end plate units, thereby facilitating the arrangement and electrical connection of the subsequent collection components; and the connection between the two end plate units can be quickly released by removing the locking block 012, thereby improving maintenance convenience.

[0079] Please refer to Figures 11 and 12. Figure 11 is an enlarged view of point E in Figure 10, and Figure 12 is a schematic diagram of the structure of the locking block 012 provided in an embodiment of the present application. In one embodiment, the locking block 012 is provided with a V-shaped groove 121, the two side walls of the V-shaped groove 121 respectively abutting against two adjacent side walls of the end plate body 111.

[0080] It can be understood that along the arrangement direction of the two end plate bodies 111 , both ends of the V-shaped groove 121 are respectively matched with the two end plate bodies 111 .

[0081] In this embodiment, through the above-mentioned arrangement, on the one hand, it is convenient to quickly position the locking block 012 on the end plate body 111 through the cooperation between the two side groove walls of the V-shaped groove 121 and the end plate body 111, thereby improving the convenience of installing the locking block 012; on the other hand, the locking block 012 can be buckled onto the end plate body 111 to enhance the strength of the connection between the two end plate bodies 111, thereby improving the vibration resistance of the connection between the two end plate units.

[0082] 12 , in one embodiment, the locking block 012 is connected to the end plate body 111 via a connector 043 , which may be a screw. The hole on the locking block 012 that fits the screw is a bolt through hole 22 , which is a round hole.

[0083] In this embodiment, by setting the bolt through hole 22 as a waist-shaped hole, the position of the locking block 012 can be adjusted relative to the position of the hole on the end plate 011 within the long diameter range of the waist-shaped hole, so that the bolt through hole 22 is aligned with the corresponding hole on the end plate 011, thereby matching the dimension chain and meeting the assembly tolerance, thereby improving the convenience of assembling the locking block 012 to the end plate 011 and improving the assembly quality.

[0084] 11 , in one embodiment, the locking block 012 is connected to the end plate body 111 via a connecting member 043 , which may be a screw. The hole on the end plate body 111 that cooperates with the screw is a first through hole 115 .

[0085] In this embodiment, the above arrangement allows the screws used to secure locking block 012 and to secure end plate 011 to the battery box to share a single screw. This allows both locking block 012 and end plate 011 to be secured simultaneously with a single screw, thereby reducing the number of screws and improving the structural compactness of the end plate assembly. Furthermore, this reduction in the number of screws reduces the number of holes on end plate 011 that accommodate the screws, thereby ensuring the strength of end plate 011 and simplifying the processing steps for end plate 011.

[0086] Accordingly, embodiments of the present application also provide a battery pack, comprising a battery case 004, battery cells, and an end plate assembly 001 as provided in some embodiments of the present application. An insert 041 is provided on the inner wall of the battery case 004. Multiple battery cells are stacked in sequence to form a cell stack 003. End plate assembly 001 is disposed within the battery case 004. Cell stack 003 is disposed between two end plates 011. Insert 041 is inserted into a slot 116.

[0087] In this embodiment, by using the end plate assembly 001 provided in some embodiments of the present application, the insert 041 on the battery box 004 is inserted into the slot 116 provided on the end plate 011, thereby increasing the mating surface between the end plate 011 and the battery box 004. Consequently, when the battery box 004 transmits vibrations to the end plate 011, the force acting on the connection between the battery box 004 and the end plate 011 is more dispersed due to the increased mating surface. This reduces the stress on the connection between the end plate 011 and the battery box 004, thereby improving the reliability of the battery pack.

Claims

1. An end plate (011) applied to a battery pack, the battery pack including a battery box (004), and a plug block (041) being provided on the inner wall of the battery box (004); the end plate (011) includes an end plate (011) body, the end plate (011) body having a first side wall (1111) and a second side wall (1112) arranged opposite to each other, a battery cell stack (003) abutting area being provided on the first side wall (1111), a slot (116) for inserting the plug block (041) being provided on the second side wall (1112), a first through hole (115) being provided on the end plate (011) body, and the slot (116) communicating with the first through hole (115).

2. The end plate (011) according to claim 1, wherein, The first through hole (115) is an oval hole.

3. The end plate (011) according to claim 1 or 2, wherein, 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 (011) according to any one of claims 1-3, wherein, 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 (011) according to claim 4, wherein, The chamfer (1115) is a rounded chamfer (1115), and along the direction of the end face close to the first through hole (115), the radius of the chamfer (1115) gradually decreases.

6. The end plate (011) according to any one of claims 1-5, wherein, The second side wall (1112) is provided with a limiting structure (112), and the limiting structure (112) includes two retaining ribs (1121), and the two retaining ribs (1121) are arranged at intervals along the axial direction of the battery cell.

7. The end plate (011) according to claim 6, wherein, The retaining rib (1121) has a third side wall (11211) facing away from the first side wall (1111), and inclined surfaces (11212) are provided on the sides of the two retaining ribs (1121) facing away from each other, and the two ends of the inclined surfaces (11212) are connected to the second side wall (1112) and the third side wall (11211).

8. The end plate (011) according to any one of claims 1-7, wherein, A weight reduction hole (113) is provided on the first side wall (1111).

9. The end plate (011) according to claim 8, wherein, A reinforcing plate is provided in the weight reduction hole (113), and both sides of the reinforcing plate are connected to the hole wall of the weight reduction hole (113); the reinforcing plate includes an inclined reinforcing plate (1141), a longitudinal reinforcing plate (1142), and a transverse reinforcing plate (1143), there are two inclined reinforcing plates (1141), the two inclined reinforcing plates (1141) are arranged intersectingly, and the two inclined reinforcing plates (1141) are respectively connected to two pairs of diagonals of the weight reduction hole (113); the longitudinal reinforcing plate (1142), the transverse reinforcing plate (1143), and the inclined reinforcing plate (1141) are arranged intersectingly.

10. The end plate (011) according to any one of claims 1-9, wherein, The slot (116) is provided in the middle of the second side wall (1112), and both opposite side walls of the slot (116) communicate with the first through hole (115); and / or, the slot (116) is provided at the end of the second side wall (1112), and the slot (116) communicates with the end of the first through hole (115).

11. The end plate (011) according to any one of claims 1-10, wherein, The first side wall (1111) is provided with at least two battery cell stack (003) abutting areas.

12. An end plate assembly (001), comprising an end plate unit, and the end plate unit includes: The end plate (011) according to any one of claims 1-11, there are two end plates (011), and the two end plates (011) are arranged at intervals along the stacking direction of the battery cells; A cable tie (002) whose head and tail are connected into a ring body, and the two ends of the ring body are respectively sleeved on the two end plates (011).

13. According to the end plate assembly (001) described in claim 12, the end plate assembly (001) further includes a locking block (012), there are two end plate units, the two end plate units are arranged side by side, and the two end plates (011) of one end plate unit are arranged in one-to-one correspondence with the two end plates (011) of the other end plate unit; the locking block (012) is arranged between two corresponding end plates (011); the two ends of the locking block (012) are respectively detachably connected to the main bodies of the two end plates (011).

14. The end plate assembly (001) according to claim 13, wherein, The locking block (012) is provided with a V-shaped groove (121), and the two side walls of the V-shaped groove (121) are respectively abutted against two adjacent side walls of the main body of the end plate (011).

15. The end plate assembly (001) according to claim 13 or 14, wherein, The locking block (012) is connected to the main body of the end plate (011) through a connecting piece (043); the hole on the locking block (012) that cooperates with the connecting piece (043) is an oblong hole.

16. The end plate assembly (001) according to any one of claims 13-15, wherein, The locking block (012) is connected to the main body of the end plate (011) through a connecting piece (043), and the hole on the main body of the end plate (011) that cooperates with the connecting piece (043) is the first through hole (115).

17. A battery pack, comprising: A battery box (004), and the inner wall of the battery box (004) is provided with an insertion block (041); A plurality of battery cells, which are stacked in sequence to form a battery cell stack; And, the end plate assembly (001) according to any one of claims 12-16, which is arranged in the battery box (004), the battery cell stack is arranged between the two end plates (011), and the insertion block (041) is inserted into the card slot (116).

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