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 the priority of a Chinese patent application filed with the China National Intellectual Property Administration on January 15, 2024, with the application number 202420100087.9, and an international application filed with the China National Intellectual Property Administration on August 28, 2024, with the 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, and 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. A 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 sequentially. The end plate assembly includes an end plate and a binding band. End plates are installed at both ends of the cell stack in the stacking direction. The binding band binds the end plate and the cells to fix the plurality of cells as a whole. 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 a battery is applied to a vehicle, due to the poor flatness of the road surface, the battery is prone to frequent vibration. 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 the first aspect, the present 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 to the first side wall, a cell stack body abutting region is installed on the first side wall, a groove for inserting the insertion block is installed on the second side wall, a first through hole is installed on the end plate body, and the groove communicates with the first through hole.

[0005] In the second aspect, the present disclosure provides an end plate assembly. The end plate assembly includes an end plate unit, the end plate unit includes a binding band and the end plate, there are two end plates, the two end plates are installed at intervals along the stacking direction of the cells, both ends of the binding band are connected to form an annular body, and both ends of the annular body are externally fitted to the two end plates respectively.

[0006] In the third aspect, the present disclosure provides a battery pack. The battery pack includes a battery box, cells, and the end plate assembly, an insertion block is installed on the inner wall of the battery box, a plurality of cells are sequentially stacked to form a cell stack body, the end plate assembly is installed in the battery box, the cell stack body is installed between the two end plates, and the insertion block is inserted into the groove.

Advantages of the Invention

[0007] The present disclosure installs a groove for inserting the insertion block of the battery box on the end plate, thereby expanding the fitting surface between the end plate and the battery box. Further, when the battery box transmits vibration to the end plate, the stress at the connection part between the battery box and the end plate is further dispersed due to the expansion of the fitting surface. Thereby, the stress received by the connection part between the end plate and the battery box can be reduced, and the connection reliability between the end plate and the battery box can be further improved.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

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Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0009] Referring to FIG. 1, FIG. 1 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 to the first side wall 1111. A cell stack body abutting region is installed on the first side wall 1111. A groove 116 for inserting the insertion block 041 is installed on the second side wall 1112. A first through hole 115 is installed in the end plate body 111. The groove 116 communicates with the first through hole 115. As shown in FIGS. 2 and 3, FIG. 2 is an enlarged view of a location A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B of FIG. 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 body abutting region is a region for abutting against the cell stack body 003 on the end plate body 111. When the end plate 011 and the cell stack body 003 are integrally tied using a binding band 002, there are two end plates 011, and the two end plates 011 are respectively located at both ends of the cell stack body. Both ends of the binding band 002 are connected to form a ring body, and both ends of the ring body are externally fitted to the two end plates 011 respectively, tightly tying the two end plates 011 and the cell stack body 003.

[0011] After integrally binding the end plate 011 and the cell stack body, it is necessary to leave it in the battery box 004 and fix it to the battery box 004 through the connecting member 043. The connecting member 043 is selectively a screw. Therefore, a second through hole 411 or a screw hole 042 is provided in the insertion block 041. When the screw hole 042 is provided in the insertion block 041, after the end of the rod portion of the screw passes through one end of the first through hole 115, it is screwed into the screw hole 042. When the second through hole 411 is provided in the insertion block 041, the end of the rod portion 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 then is screwed into the battery box 004. As shown in FIG. 4, FIG. 4 is a diagram showing the alignment of the end plate 011 and the battery box 004 provided by an embodiment of the present disclosure.

[0012] Exemplarily, the end plate 011 is a metal plate, specifically 6-series aluminum. Also, the axis of the first through hole 115 is parallel to the axis of the cell. A plurality of first through holes 115 and a plurality of grooves 116 are provided in the end plate body 111, and the plurality of grooves 116 are provided in a one-to-one correspondence with the plurality of first through holes 115.

[0013] In this embodiment, by providing the groove 116 for inserting the insertion block 041 of the battery box 004 in the end plate 011, the fitting surface between the end plate 011 and the battery box 004 is enlarged. Further, when the battery box 004 transmits vibration to the end plate 011, the stress at the connection site between the battery box 004 and the end plate 011 is further dispersed due to the enlargement of the fitting surface. Thereby, the stress received by the connection site between the end plate 011 and the battery box 004 can be reduced, and further the connection reliability between the end plate 011 and the battery box 004 can be improved.

[0014] Referring to FIG. 2, in one embodiment, the first through hole 115 is an oval 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 axis range of the oval hole with respect to the position of the hole in the battery box 004, so that the first through-hole 115 is aligned with the corresponding hole in the battery box 004, thereby matching the dimension chain, meeting the assembly tolerance, further improving the convenience of assembling the end plate 011 to the battery box 004, and improving the assembly quality.

[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 fixing the end plate 011 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 portion 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, by the above installation, the sharpness of the first edge 1114 can be removed. Thereby, on the one hand, the stress-bearing state here can be improved and stress concentration can be avoided, and on the other hand, it is possible to avoid the sharp part from rubbing against other members.

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

[0023] In this embodiment, by the above installation, the first edge 1114 is gradually decreased in dimension along the direction approaching the end face of the first through hole 115. In this way, on the one hand, it is advantageous for the weight reduction of the end plate 011, and on the other hand, the dimension of one end approaching the tip of the cell of the end plate 011 can be made smaller, and the arrangement of the electrical components of the battery can be facilitated.

[0024] Referring to FIG. 6, FIG. 6 is an enlarged view of the D portion in FIG. 1. In one embodiment, a position-limiting structure 112 is installed on the second side wall 1112, the position-limiting structure 112 includes two stopper ribs 1121, and the two stopper ribs 1121 are installed at intervals along the axial direction of the cell.

[0025] It is understood that the stopper rib 1121 is integrally formed with the end plate body 111 and can be integrally formed by casting or molding.

[0026] In this embodiment, by installing the position-limiting structure 112 on the surface of the end plate 011 away from the contact surface with the cell, both ends of the binding band can be positioned by the position-limiting structure 112, thereby improving the consistency of the heights of both ends of the binding band, and further enabling the binding force of the binding band on the cell stack body to be parallel to the stacking direction of the cells. Thereby, it is possible to avoid 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.

[0027] Referring to FIG. 6, in one embodiment, the stopper rib 1121 has a third side wall 11211 that is away from the first side wall 1111. Bevels 11212 are installed on the sides of the two stopper ribs 1121 that are away from each other. Both ends of the bevel 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 cut-off unit. In order to avoid the stopper rib 1121 approaching the end of the electrical component and damaging the electrical component, in this embodiment, with the above installation, the side of the stopper rib 1121 facing the electrical component of the battery becomes the bevel 11212, thereby reducing the stress when the side of the stopper rib 1121 approaching the electrical component contacts the electrical component, and further avoiding the stopper rib 1121 from damaging the electrical component.

[0029] Also, with the above installation, when generating a thrust force on the stopper rib 1121, the stress received by the connection site between the sides of the two stopper ribs 1121 that are away from each other and the second side wall 1112 can be reduced, thereby avoiding damage to the connection site between the stopper rib 1121 and the second side wall 1112, and further improving the reliability of the end plate 011.

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

[0031] When binding the end plate 011 and the cell stack body with a binding band, it is understood that there are a plurality of stopper ribs 1121 on both sides of the binding band.

[0032] In this embodiment, by installing a plurality of position-limiting structures 112, on the one hand, the positional stability of the binding band located on the end plate 011 can be improved, and on the other hand, when the binding band presses against the stopper rib 1121, the pressing force received by the binding band can be dispersed, thereby improving the force-receiving state of the binding band and further improving the service life of the binding band.

[0033] Referring to FIG. 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 a plurality of position-limiting structures 112. The multiple position-limiting structures 112 of each set are sequentially installed on the second side wall along a direction perpendicular to the axis of the cell.

[0034] One cell stack body can arrange and fix a plurality of binding bands. For example, it is understood that one cell stack body can arrange and fix two binding bands. And the plurality of binding bands are installed at intervals along the axial direction of the cell. Therefore, in order to improve the reliability of the binding of the binding bands, a plurality of sets of position-limiting structures 112 are installed on the end plate body 111 to limit the position of each binding band, thereby improving the position accuracy of each individual binding band so that the binding force applied by each binding band to the cell stack body is parallel to the stacking direction of the cells.

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

[0036] In this embodiment, by installing the weight reduction holes 113 in the first side wall 1111, the weight of the end plate 011 can be reduced. In this way, 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. On the other hand, the weight of the end plate 011 can be reduced, thereby reducing the weight of the battery pack, which is beneficial for achieving weight reduction of the battery pack.

[0037] Referring to FIG. 7, in one embodiment, a reinforcing plate is installed in the weight reduction hole 113. Both sides of the reinforcing plate are connected to the hole wall of the weight reduction hole 113.

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

[0039] Referring to FIG. 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 in a cross manner. One diagonal reinforcing plate 1141 is connected to a set of two diagonals in the weight reduction hole 113, and the other diagonal reinforcing plate 1141 is connected to another set of two diagonals in the weight reduction hole 113.

[0040] It can be understood that both ends of one diagonal reinforcing plate 1141 are respectively connected to a pair of opposite diagonals installed in the weight reduction hole 113, and both ends of the other diagonal reinforcing plate 1141 are respectively connected to another pair of opposite diagonals installed in the weight reduction hole 113.

[0041] In this embodiment, by the above installation, the pressure received by any side of the end plate 011 can be uniformly dispersed to the opposite side through the two diagonal reinforcing plates 1141. Thereby, the force-receiving state of the end plate 011 is improved, and the reliability of the end plate 011 can be improved.

[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 arranged to intersect.

[0043] In this embodiment, by the above arrangement, on the one hand, the strength of the end plate module can be increased, the reliability of the end plate 011 can be improved, and on the other hand, by more dispersing the force received by the end plate 011, the force receiving state of the end plate 011 can be improved, and further the reliability of the end plate 011 can be improved.

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

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

[0046] Here, by installing the groove 116 in the middle of the second side wall 1112, the force received by 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 connection reliability between the end plate 011 and the battery box.

[0047] Also, by installing 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 the warping of the end of the end plate 011 due to processing errors and further improving the connection reliability between the end plate 011 and the battery box. One embodiment is that at least two cell stack body abutting regions are installed on the first side wall 1111, so that the end plate is used to abut against at least two cell stack bodies.

[0048] Here, the cell stack body contact region is installed on the first side wall 1111 so as to be distributed in a matrix shape.

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

[0050] Referring to FIG. 8, FIG. 8 is a structural diagram of an end plate assembly 001 provided by an embodiment of the present disclosure. Correspondingly, the embodiment of the present disclosure further provides an end plate assembly 001. The end plate assembly 001 includes an end plate unit, and the end plate unit includes a binding band 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 installed at intervals along the stacking direction of the cells. Both ends of the binding band 002 are connected to form an annular body. Both ends of the annular body are externally fitted to the two end plates 011 respectively. Specifically, the binding band 002 is located between the two stopper ribs 1121.

[0051] Exemplarily, the binding band 002 is a steel strip.

[0052] Here, when the first side wall is used to contact the two cell stack bodies 003, as shown in FIG. 9, FIG. 9 is a structural diagram of the end plate assembly 001 and the cell stack body 003 provided by an embodiment of the present disclosure combined. In FIG. 9, the binding band 002 externally fits the two cell stack bodies 003 therein.

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

[0054] Also, in this embodiment, both ends of the binding band 002 can be positioned by the position-limiting structure 112, thereby improving the height consistency of both ends of the binding band 002, and further enabling the binding force exerted by the binding band 002 on the cell stack body to be parallel to the stacking direction of the cells. Thereby, it is possible to avoid 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 FIG. 10, FIG. 10 is a structural diagram of another end plate 011 assembly provided according to 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, and the two end plates 011 in one end plate unit and the two end plates 011 in another end plate unit are installed in one-to-one correspondence. A lock block 012 is installed between every two corresponding end plates 011. Both ends of the lock block 012 are detachably connected to the two end plate bodies 111 respectively.

[0056] Exemplarily, the lock block 012 is connected to the end plate body 111 through 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 position accuracy of the cells of the two end plate units, which is not only advantageous for the subsequent arrangement and electrical connection of the collection unit, but also can quickly release the connection between the two end plate units through the lock block 012 and improve the convenience of maintenance.

[0058] Referring to FIGS. 11 and 12, FIG. 11 is an enlarged view of portion E in FIG. 10, and FIG. 12 is a structural diagram of the lock block 012 provided by an embodiment of the present disclosure. In one embodiment, 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 are respectively in contact with two adjacent side walls of the end plate 011 body.

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

[0060] In this embodiment, by the above installation, on the one hand, due to the fitting of the groove walls on both sides of the V-shaped groove 121 and the end plate body 111, it is easy to quickly position the lock block 012 on the end plate body 111, 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 can be increased, and further the vibration resistance of the connection part between the two end plate units can be improved.

[0061] Referring to FIG. 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 for mating with the connecting member 043 of the lock block 012 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 hole, the position of the lock block 012 can be adjusted within the major axis range of the oval hole with respect 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, meeting the assembly tolerance, and further improving the convenience of assembling the lock block 012 to the end plate 011 and improving the assembly quality.

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

[0064] In this embodiment, with the above installation, the screw for fixing the lock block 012 and the screw for fixing the end plate 011 to the battery box can be shared by one screw. In this way, on the one hand, the lock block 012 and the end plate 011 can be fixed simultaneously with one screw, thereby reducing the number of screws and further improving the structural compactness of the end plate assembly. On the other hand, based on the reduction of the number of screws, the number of holes that align with the screws of the end plate 011 can be reduced, thereby ensuring the strength of the end plate 011 and simplifying the processing steps of the end plate 011.

[0065] Correspondingly, the embodiments of the present disclosure further provide a battery pack. The battery pack includes 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. A plurality of cells are sequentially stacked to form a cell stack body 003. The end plate assembly 001 is installed in the battery box 004. The cell stack body 003 is installed between two end plates 011. The insertion block 041 is inserted into the groove 116.

[0066] In this embodiment, by adopting 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 expanding the fitting surface between the end plate 011 and the battery box 004. Further, when the battery box 004 transmits vibration to the end plate 011, the stress at the connection part between the battery box 004 and the end plate 011 is further dispersed due to the expansion of the fitting surface. Thereby, the stress received by the connection part between the end plate 011 and the battery box 004 can be reduced, and the reliability of the battery pack can be further improved.

Explanation of Symbols

[0067] 001: End plate assembly 011: End plate 111: End plate body 1111: First side wall 1112: Second side wall 1113: Relief groove 1114: First edge 1115: Rounding chamfer 112: Position limiting structure 1121: Stopper rib 11211: Third side wall 11212: Inclined surface 113: Lightening hole 1141: Diagonal reinforcing plate 1142: Vertical reinforcing plate 1143: Horizontal reinforcing plate 115: First through hole 116: Groove 012: Lock block 121: V-groove 122: Bolt through hole 002: Tie band 003: Cell stack body 004: Battery box 041: Insertion block 411: Second through hole 042: Threaded hole 043: Connecting member

Claims

1. An end plate (011), wherein 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), a cell stack body abutting region is installed on the first side wall (1111), a groove (116) for inserting the insertion block (041) is installed on the second side wall (1112), a first through hole (115) is installed on the end plate (011) body, and the groove (116) communicates with the first through hole (115). An end plate characterized by this.

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

3. The end plate according to claim 1, wherein a relief groove (1113) is installed on the end plate (011), 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, wherein the second side wall (1112) has a first edge (1114), and a chamfer (1115) is installed at the end of the first edge (1114).

5. The end plate according to claim 4, wherein the chamfer (1115) is a rounded 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. A position limiting structure (112) is installed on the second side wall (1112), the position limiting structure (112) includes two stopper ribs (1121), and the two stopper ribs (1121) are installed at intervals along the axial direction of the cell. The end plate according to claim 1, characterized by this.

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

8. The end plate according to claim 1, wherein a weight reduction hole (113) is provided in the first side wall (1111).

9. A reinforcing plate is provided in the weight reduction hole (113), both sides of the reinforcing plate are connected to the hole walls of the weight reduction hole (113), the reinforcing plate includes an inclined reinforcing plate (1141), a vertical reinforcing plate (1142), and a horizontal reinforcing plate (1143), there are two inclined reinforcing plates (1141), the two inclined reinforcing plates (1141) are intersectingly installed, one inclined reinforcing plate (1141) is connected to a set of two diagonals in the weight reduction hole (113), and the other inclined reinforcing plate (1141) is connected to another set of two diagonals in the weight reduction hole (113), and the vertical reinforcing plate (1142), the horizontal reinforcing plate (1143), and the inclined reinforcing plate (1141) are intersectingly installed. The end plate according to claim 8, characterized in that

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

11. The end plate according to claim 1, wherein at least two cell stack body (003) abutting regions are provided on the first side wall (1111).

12. An end plate assembly (001), wherein the end plate assembly (001) includes an end plate unit, the end plate unit includes the end plate (011) according to any one of claims 1 to 11 and a binding band (002), there are two end plates (011), the two end plates (011) are installed at intervals along the stacking direction of the cells, both ends of the binding band (002) are connected to form a ring body, and both ends of the ring body are externally fitted to the two end plates (011) respectively. The end plate assembly is characterized in that

13. 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, two end plates (011) in one end plate unit and two end plates (011) in another end plate unit are installed in a one-to-one correspondence, the lock block (012) is installed between any two corresponding end plates (011), and both ends of the lock block (012) are detachably connected to the main bodies of the two end plates (011) respectively. The end plate assembly according to claim 12, characterized in that.

14. A V-shaped groove (121) is installed in the lock block (012), and groove walls on both sides of the V-shaped groove (121) are respectively in contact with two adjacent side walls of the main body of the end plate (011). The end plate assembly according to claim 13, characterized in that.

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

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

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

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