End plate for battery module and battery module

Abstract

The utility model provides an end plate of a battery module and the battery module, the end plate comprises a first part, a second part and a cavity, the first part and the second part are oppositely arranged, the cavity is enclosed by the first part and the second part, at least one reinforcing structure is arranged in the cavity, and the reinforcing structure comprises a first reinforcing part and a second reinforcing part which are connected; the first reinforcing part is connected with the first part and a first interval is formed between the first reinforcing part and the second part, and the second reinforcing part is connected with the second part and a second interval is formed between the second reinforcing part and the first part, so that the first interval can provide a buffer space for the movement and deformation of the first reinforcing part when the end plate is subjected to the action of expansion force or lateral extrusion force of the battery cell; and the second interval can provide a buffer space for the movement and deformation of the second reinforcing part so as to buffer and absorb part of expansive force and extrusion force, reduce the expansive force, reduce the deformation degree of the end plate and avoid the problems of cycle acceleration of the battery cell, overlarge deformation of the module end plate, outer frame breakage and the like.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an end plate for a battery module and a battery module. Background Art

[0002] Square shell battery cell modules usually use module end plates as the module structure load-bearing components, providing preload to fix the battery cells and providing corresponding structural strength to resist loads such as vibration and impact, ensuring the integrity of the module function and structure. Therefore, the performance of the module end plates is closely related to the performance of the battery module. Utility Model Content

[0003] In view of this, the purpose of the present application is to propose an end plate for a battery module and a battery module to solve or partially solve the problems raised in the background art.

[0004] Based on the above-mentioned purpose, the first aspect of the present application provides an end plate for a battery module, comprising a first part and a second part arranged opposite to each other and a cavity formed by the first part and the second part, wherein at least one reinforcing structure is provided in the cavity, and the reinforcing structure comprises a first reinforcing part and a second reinforcing part connected to each other, the first reinforcing part is connected to the first part and has a first gap between the first reinforcing part and the second part, and the second reinforcing part is connected to the second part and has a second gap between the first part.

[0005] Optionally, the reinforcement structure further includes a transition portion, which is connected to both the first reinforcement portion and the second reinforcement portion, and an extension direction of the transition portion is arranged at an angle to both the first portion and the second portion.

[0006] Optionally, the first reinforcement portion is an arc-shaped structure that protrudes toward the second portion, and the second reinforcement portion is an arc-shaped structure that protrudes toward the first portion.

[0007] Optionally, an angle between a line connecting the center of the first reinforcement portion and the center of the second reinforcement portion and a first direction is 0-90°, and the first direction is a thickness direction of the end plate.

[0008] Optionally, the first reinforcement portion and the second reinforcement portion are both L-shaped structures, or the first reinforcement portion, the transition portion and the second reinforcement portion are formed into a Z-shaped structure.

[0009] Optionally, the included angle between the first reinforcement portion and the transition portion is 45° to 135°, and the included angle between the second reinforcement portion and the transition portion is 45° to 135°.

[0010] Optionally, the first reinforcement portion and the second reinforcement portion are symmetrically arranged with the center position of the transition portion as the center.

[0011] Optionally, the ratio of the size of the orthographic projection of the reinforcing structure in the height direction of the end plate to the size of the orthographic projection of the reinforcing structure in the thickness direction of the end plate is 0.5:1 to 1.5:1.

[0012] Optionally, the number of the reinforcement structures N=L / 2W±1, wherein L is the height of the cavity and W is the thickness of the cavity.

[0013] A second aspect of the present application provides a battery module, comprising the end plate described in any one of the first aspects above.

[0014] From the above description, it can be seen that the end plate and battery module for the battery module provided by the present application have at least one reinforcement structure provided in the cavity, and the reinforcement structure includes a first reinforcement part and a second reinforcement part connected to each other, the first reinforcement part is connected to the first part and has a first gap between the first reinforcement part and the second reinforcement part is connected to the second part and has a second gap between the first part. In this way, when the end plate is subjected to the expansion force of the battery cell or the lateral extrusion force, the first gap can provide a buffer space for the movement and deformation of the first reinforcement part, and the second gap can provide a buffer space for the movement and deformation of the second reinforcement part, so as to buffer and absorb part of the expansion force and extrusion force, reduce the expansion force, reduce the deformation degree of the end plate, and avoid problems such as accelerated cycle of the battery cell, excessive deformation of the module end plate, and rupture of the outer frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 This is a schematic structural diagram of the end plate of an embodiment of the present application;

[0017] Figure 2 This is a first cross-sectional schematic diagram of an end plate according to an embodiment of the present application;

[0018] Figure 3 A first partially enlarged schematic diagram of a second cross section of an end plate according to an embodiment of the present application;

[0019] Figure 4 A second partially enlarged schematic diagram of a second cross section of the end plate of an embodiment of the present application;

[0020] Figure 5 This is a first partially enlarged schematic diagram of a third cross section of the end plate of an embodiment of the present application;

[0021] Figure 6A second partially enlarged schematic diagram of a third cross section of the end plate of an embodiment of the present application;

[0022] Figure 7 This is a partially enlarged schematic diagram of a fourth cross section of the end plate of an embodiment of the present application;

[0023] Figure 8 This is a fifth cross-sectional schematic diagram of the end plate of an embodiment of the present application;

[0024] Figure 9 This is a schematic structural diagram of a battery module according to an embodiment of the present application.

[0025] In the figure: 1. end plate; 11. first part; 12. second part; 13. cavity; 14. reinforcement structure; 141. first reinforcement part; 142. second reinforcement part; 143. first spacer; 144. second spacer; 145. transition part; 146. third spacer; 147. fourth spacer; 2. side plate; 3. battery cell stack. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] Battery cells expand during cycling. Due to the limited space within the module, considerable expansion forces are generated at the end of life (EOL) of the cell. If the module end plates are insufficiently rigid, the expansion forces can cause them to deform excessively, potentially cracking the module frame. However, if the module end plates are thick and too rigid, the excessive expansion forces can lead to accelerated cycling and lifespan degradation of the battery cells. Furthermore, under module compression conditions, the end plates can rupture prematurely, failing to meet requirements.

[0029] Therefore, how to provide a suitable end plate that can not only meet the stiffness requirements but also have a certain degree of anti-extrusion performance to prevent the end plate from breaking when squeezed is an urgent problem to be solved.

[0030] Based on this, the present application provides an end plate for a battery module. Figure 1 shows a schematic diagram of the structure of the end plate, Figure 2 A first schematic cross-sectional view of the end plate is shown.

[0031] like Figure 1 and Figure 2 As shown, the end plate 1 includes a first part 11 and a second part 12 arranged opposite to each other and a cavity 13 formed by the first part 11 and the second part 12. At least one reinforcement structure 14 is provided in the cavity 13. The reinforcement structure 14 includes a first reinforcement part 141 and a second reinforcement part 142 connected to each other. The first reinforcement part 141 is connected to the first part 11 and has a first gap 143 between it and the second part 12. The second reinforcement part 142 is connected to the second part 12 and has a second gap 144 between it and the first part 11.

[0032] Specifically, the first part 11 can be the inner plate of the end plate 1 close to the battery module, and the second part 12 can be the outer plate of the end plate 1 away from the battery module. The first part 11 and the second part 12 are connected by the top plate and the bottom plate of the end plate 1, so that the first part 11 and the second part 12 are enclosed to form a cavity 13.

[0033] When end plate 1 is subjected to lateral compression, cavity 13 provides a buffer, improving its compression resistance and thus providing better protection for the battery cells. Furthermore, when subjected to cell expansion forces, cavity 13 absorbs some of the force, minimizing deformation of end plate 1 and preventing cracking of the module frame.

[0034] A reinforcement structure 14 is provided in the cavity 13 . There may be one or more reinforcement structures 14 , which is not specifically limited herein.

[0035] The reinforcing structure 14 can provide a certain buffering effect on the lateral extrusion force of the end plate 1, reduce the extrusion force on the first part 11 of the end plate 1, and thus better protect the battery cell, effectively solving the mechanical safety problem caused by insufficient anti-extrusion performance of the end plate 1.

[0036] The reinforcing structure 14 includes a first reinforcing portion 141 and a second reinforcing portion 142 connected to the first portion 11 with a first gap 143 therebetween. The second reinforcing portion 142 is connected to the second portion 12 with a second gap 144 therebetween.

[0037] In this way, when the end plate 1 is subjected to the expansion force of the battery cell, the first spacer 143 can provide a buffer space for the movement and deformation of the first reinforcement part 141, and the second spacer 144 can provide a buffer space for the movement and deformation of the second reinforcement part 142, so as to buffer and absorb part of the expansion force, thereby reducing the deformation degree of the end plate 1 and avoiding the rupture of the module frame.

[0038] Similarly, when the end plate 1 is subjected to lateral extrusion pressure, the first gap 143 can still provide a buffer space for the movement and deformation of the first reinforcement part 141, and the second gap 144 can still provide a buffer space for the movement and deformation of the second reinforcement part 142, so as to buffer and absorb part of the extrusion force, thereby buffering the lateral extrusion force of the end plate 1 and reducing the extrusion force on the first part 11 of the end plate 1, thereby better protecting the battery cell and effectively solving the mechanical safety problem caused by the insufficient anti-extrusion performance of the end plate 1.

[0039] Therefore, in the present application, a cavity 13 is provided and a reinforcing structure 14 is provided in the cavity 13, and a first gap 143 is provided between the first reinforcing portion 141 of the reinforcing structure 14 and the second portion 12 of the end plate 1, and a second gap 144 is provided between the second reinforcing portion 142 and the second portion 12 of the end plate 1. In this way, when the end plate 1 is subjected to the expansion force of the battery cell or the lateral extrusion, the reinforcing structure 14 and the cavity 13 can absorb and buffer the expansion force and the extrusion force, reduce the expansion force, reduce the deformation degree of the end plate 1, and avoid problems such as accelerated cycle of the battery cell, excessive deformation of the module end plate 1, and rupture of the outer frame.

[0040] In some embodiments, see Figure 2 The reinforcement structure 14 further includes a transition portion 145 , which is connected to both the first reinforcement portion 141 and the second reinforcement portion 142 . The extension direction of the transition portion 145 forms an angle with the first portion 11 and the second portion 12 .

[0041] Specifically, the transition portion 145 is used to connect the first reinforcement portion 141 and the second reinforcement portion 142. On the one hand, it can improve the connection stability of the first reinforcement portion 141 and the second reinforcement portion 142. On the other hand, it can increase the distance between the first reinforcement portion 141 and the second reinforcement portion 142, so that when the end plate 1 is subjected to the expansion force or lateral extrusion force of the battery cell, there is enough space for the deformation and movement of the first reinforcement portion 141 and the second reinforcement portion 142, thereby avoiding interference between the first reinforcement portion 141 and the second reinforcement portion 142 during the deformation and movement process, thereby affecting the buffering effect.

[0042] The transition portion 145 extends at an angle to both the first portion 11 and the second portion 12. As such, the transition portion 145 not only connects the first reinforcement portion 141 and the second reinforcement portion 142 but also serves as an energy-absorbing component. When the end plate 1 is subjected to cell expansion or lateral extrusion, the transition portion 145 can provide a certain degree of buffering against these forces. Furthermore, the angled transition portion 145 can also deform and displace to a certain degree, further increasing its buffering effect against these forces, thereby reducing deformation of the end plate 1 and improving its anti-extrusion performance.

[0043] Figure 3 FIG. 1 shows a first partial enlarged schematic diagram of a second cross section of the end plate 1. In some embodiments, as Figure 3 As shown, the first reinforcement portion 141 is an arc-shaped structure convex toward the second portion 12 , and the second reinforcement portion 142 is an arc-shaped structure convex toward the first portion 11 .

[0044] Specifically, the first reinforcement portion 141 and the second reinforcement portion 142 are both arc-shaped structures. The arc-shaped structure has better deformation capacity and bending resistance, which can better improve the bending resistance of the end plate 1. In addition, the first reinforcement portion 141 and the second reinforcement portion 142 protrude in opposite directions. The staggered arrangement of the first reinforcement portion 141 and the second reinforcement portion 142 can provide each other with more deformation and movement space, thereby better buffering and absorbing expansion or extrusion forces, further improving the anti-extrusion performance of the end plate 1, reducing the degree of deformation of the end plate 1, and also preventing interference between the first reinforcement portion 141 and the second reinforcement portion 142 when subjected to expansion and extrusion forces.

[0045] Figure 4 FIG. 1 shows a second partially enlarged schematic diagram of a second cross section of the end plate 1. In some embodiments, as Figure 4 As shown, the center of the first reinforcement portion 141 (ie Figure 4 M) and the center of the second reinforcement portion 142 (ie Figure 4 N in the first direction (i.e. Figure 4 The OA direction is also Figure 1 The angle between the OA direction and the Figure 4 The angle θ in the figure is 0 to 90°, and the first direction is the thickness direction of the end plate 1.

[0046] Specifically, the angle between the line connecting the center of the first reinforcement part 141 and the center of the second reinforcement part 142 and the first direction can be 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.

[0047] When the angle between the connecting line and the first direction is within this range, the first reinforcement portion 141 and the second reinforcement portion 142 have sufficient deformation space to effectively buffer and absorb the expansion force and the extrusion force, thereby reducing the deformation degree of the end plate 1 and improving the anti-extrusion performance of the end plate 1.

[0048] When the angle between the connecting line and the first direction is greater than 90°, the first interval 143 between the second reinforcement portion 142 and the first portion 11 is too small, or the second interval 144 between the first reinforcement portion 141 and the second portion 12 is too small, so that sufficient buffer space cannot be provided for the deformation and movement of the second reinforcement portion 142 or the first reinforcement portion 141, thereby failing to effectively improve the anti-extrusion performance.

[0049] Figure 5 FIG. 1 shows a first partially enlarged schematic diagram of a third cross section of the end plate 1. In some embodiments, as Figure 5 As shown, the first reinforcement portion 141 and the second reinforcement portion 142 are both L-shaped structures.

[0050] Specifically, the first reinforcement portion 141 and the second reinforcement portion 142 are connected by a transition portion 145 . For example, the transition portion 145 extends along the first direction.

[0051] One end of the first reinforcement portion 141 of the L-shaped structure is connected to the first portion 11, and the other end is connected to the transition portion 145. Similarly, one end of the second reinforcement portion 142 of the L-shaped structure is connected to the second portion 12, and the other end is connected to the transition portion 145. In this way, a third gap 146 is formed between the first reinforcement portion 141 and the transition portion 145, and a fourth gap 147 is formed between the second reinforcement portion 142 and the transition portion 145. The existence of the third gap 146 and the fourth gap 147 further provides space for the deformation and movement of the first reinforcement portion 141 and the second reinforcement portion 142, thereby providing a better buffering effect against lateral extrusion force and battery cell expansion force, thereby further improving the anti-extrusion performance of the end plate 1.

[0052] Figure 6 A second partially enlarged schematic diagram of a third cross section of the end plate 1 is shown. Figure 6 As shown, the first reinforcement portion 141 and the second reinforcement portion 142 are equivalent to a right-angle arc structure, and the center of the first reinforcement portion 141 (i.e. Figure 6 Q in the figure) and the center of the second reinforcement portion 142 (i.e. Figure 6 The line connecting the W in the first direction (i.e. Figure 6 The OA direction is also Figure 1 The angle between the OA direction and the Figure 4 The angle θ in the figure is 0 to 90°, and the first direction is the thickness direction of the end plate 1.

[0053] The angle between the line connecting the center of the first reinforcing portion 141 and the center of the second reinforcing portion 142 and the first direction can be 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.

[0054] When the angle between the connecting line and the first direction is within this range, the first reinforcement portion 141 and the second reinforcement portion 142 have sufficient deformation space to effectively buffer and absorb the expansion force and the extrusion force, thereby reducing the deformation degree of the end plate 1 and improving the anti-extrusion performance of the end plate 1.

[0055] Figure 7 FIG. 1 is a partial enlarged schematic diagram of a fourth cross section of the end plate 1. In some embodiments, as Figure 7 As shown, the first reinforcement portion 141 , the transition portion 145 and the second reinforcement portion 142 are formed into a Z-shaped structure.

[0056] Specifically, the first reinforcement portion 141, the transition portion 145 and the second reinforcement portion 142 form a Z-shaped structure. The staggered first reinforcement portion 141 and the second reinforcement portion 142 can provide each other with more deformation and movement space, so as to better buffer and absorb the expansion force or the extrusion force, further improve the anti-extrusion performance of the end plate 1, reduce the deformation degree of the end plate 1, and at the same time avoid interference between the first reinforcement portion 141 and the second reinforcement portion 142 when subjected to expansion force and extrusion force.

[0057] In some embodiments, see Figure 7 The included angle between the first reinforcement portion 141 and the transition portion 145 is 45° to 135°, and the included angle between the second reinforcement portion 142 and the transition portion 145 is 45° to 135°.

[0058] Specifically, the angle between the first reinforcement portion 141 and the transition portion 145 can be 45° to 135°. For example, the angle can be 45°, 55°, 65°, 75°, 85°, 95°, 105°, 115°, 125°, 135°, etc.

[0059] The included angle between the second reinforcement portion 142 and the transition portion 145 (i.e. Figure 7 The angle b) can be 45° to 135°. For example, the angle can be 45°, 55°, 65°, 75°, 85°, 95°, 105°, 115°, 125°, 135°, etc.

[0060] When the angle is within this range, the bending angle between the first reinforcement part 141 and the transition part 145, and the bending angle between the second reinforcement part 142 and the transition part 145 are moderate, so that the sizes of the first interval 143 and the second interval 144 are moderate, which can provide an effective buffer space for the deformation and movement of the first reinforcement part 141 and the second reinforcement part 142, thereby effectively increasing the anti-extrusion performance of the end plate 1.

[0061] When the angle is too small, the distance between the first reinforcement part 141 and the second reinforcement part 142 is too close, so that when squeezed, interference may occur between the first reinforcement part 141 and the second reinforcement part 142, reducing the buffering effect; when the angle is too large, the first interval 143 between the first reinforcement part 141 and the second part 12 and the second interval 144 between the second reinforcement part 142 and the first part 11 are too small, so that when subjected to lateral squeezing, the buffer space of the first reinforcement part 141 and the second reinforcement part 142 is too small, and it cannot effectively buffer the lateral pressure, and thus cannot effectively improve the anti-extrusion performance and anti-bending performance of the end plate 1.

[0062] In some embodiments, the first reinforcement portion 141 and the second reinforcement portion 142 are symmetrically arranged with the center position of the transition portion 145 as the center.

[0063] Specifically, when the first reinforcement portion 141 and the second reinforcement portion 142 are symmetrically arranged with the center position of the transition portion 145 as the center, the sizes of the first interval 143 and the second interval 144 are basically the same, thereby providing basically the same buffer space for the first reinforcement portion 141 and the second reinforcement portion 142, ensuring that the first reinforcement portion 141 and the second reinforcement portion 142 have sufficient deformation space to buffer and absorb lateral extrusion force and battery cell expansion force.

[0064] Figure 8 A fifth cross-sectional view of the end plate 1 is shown. Figure 8 As shown, the reinforcement structure 14 is arranged in the height direction of the end plate 1 (ie Figure 1 The size of the orthographic projection of the OB direction shown) (i.e. Figure 8 The P shown in FIG. 1 and the reinforcing structure 14 are arranged in the thickness direction of the end plate 1 (ie Figure 1 The size of the orthographic projection of the OA direction shown) (i.e. Figure 8 The ratio of W) shown is 0.5:1 to 1.5:1. In this way, the size ratio of the reinforcement structure 14 is ensured to be moderate, which can effectively improve the anti-extrusion performance of the end plate 1 without significantly increasing the cross-sectional rigidity of the end plate 1.

[0065] When the size of the orthographic projection of the reinforcement structure 14 in the height direction of the end plate 1 (i.e. Figure 8 The P shown in FIG. 1 is related to the size of the positive projection of the reinforcing structure 14 in the thickness direction of the end plate 1 (ie Figure 8 When the W shown in FIG. 1 is less than 0.5:1, the height of the reinforcing structure 14 is too small to effectively improve the anti-extrusion performance of the end plate 1; when the size of the orthographic projection of the reinforcing structure 14 in the height direction of the end plate 1 (i.e. Figure 8 The P shown in FIG. 1 is related to the size of the positive projection of the reinforcing structure 14 in the thickness direction of the end plate 1 (ie Figure 8 When the ratio W shown is greater than 1.5:1, the height of the reinforcing structure 14 is too large, so that the cross-sectional rigidity of the end plate 1 is excessively increased, thereby reducing the anti-extrusion performance of the end plate 1.

[0066] For example, the size of the orthographic projection of the reinforcement structure 14 in the height direction of the end plate 1 (i.e. Figure 8 The P shown in FIG. 1 is related to the size of the positive projection of the reinforcing structure 14 in the thickness direction of the end plate 1 (ie Figure 8 The W) shown can be 0.5:1, 0.6:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1.0:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, etc.

[0067] In some embodiments, see Figure 8 The number of reinforcement structures 14 provided is N=L / 2W±1, where L is the height of the cavity 13 and W is the thickness of the cavity 13 .

[0068] Specifically, when the number of reinforcement structures 14 provided is N=L / 2W±1, it has been verified through experiments that the number of reinforcement structures 14 provided is appropriate, which can effectively improve the anti-extrusion performance of the end plate 1 .

[0069] Figure 9 Schematic diagram of the structure of the battery module is shown. In some embodiments, Figure 9 As shown, the present application provides a battery module, comprising the end plate 1 of any one of the above-mentioned first aspects.

[0070] Specifically, the battery module includes two oppositely disposed end plates 1 and two oppositely disposed side plates 2 . The two end plates 1 and the two side plates 2 together form a receiving space, and the battery cell stack 3 is received in the receiving space.

[0071] In order to verify the anti-extrusion performance of the end plate 1 provided in the present application, the end plate 1 with a reinforcing structure 14 arranged in the hollow cavity 13 in the present application and the end plate 1 with straight ribs (reinforcing ribs arranged perpendicular to the first part 11 and the second part 12) arranged in the hollow cavity 13 in the prior art are tested. The test data are shown in Tables 1 and 2 below.

[0072] Table 1 Experimental data of simulation and comparison test of extrusion working condition in module end plate direction

[0073]

[0074]

[0075] Table 2 Comparison of module expansion force working condition simulation:

[0076]

[0077] It can be seen from Table 1 and Table 2 that, by comparing the simulation results of Examples 1 to 3 and the comparative example, it can be seen that after adopting the end plate 1 of the embodiment, the cavity of the end plate 1 deforms and absorbs energy under the module extrusion condition, which is manifested as a reduction in the extrusion force; under the module expansion condition, the maximum expansion force of the battery cell at the end of the module is reduced, which is beneficial to reducing the deformation of the end plate 1 and improving the anti-extrusion performance of the end plate 1.

[0078] The battery module provided in the present application is provided with at least one reinforcement structure 14 in the cavity 13 of the end plate 1, and the reinforcement structure 14 includes a first reinforcement part 141 and a second reinforcement part 142 connected to each other. The first reinforcement part 141 is connected to the first part 11 and has a first gap 143 between it and the second part 12. The second reinforcement part 142 is connected to the second part 12 and has a second gap 144 between it and the first part 11. In this way, when the end plate 1 is subjected to the expansion force of the battery cell or the lateral extrusion force, the first gap 143 can provide a buffer space for the movement and deformation of the first reinforcement part 141, and the second gap 144 can provide a buffer space for the movement and deformation of the second reinforcement part 142, so as to buffer and absorb part of the expansion force and extrusion force, reduce the expansion force, reduce the deformation degree of the end plate 1, and avoid problems such as accelerated cycle of the battery cell, excessive deformation of the module end plate 1, and rupture of the outer frame.

[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the above aspects of the present application, which are not provided in detail for the sake of simplicity.

[0080] The embodiments of the present application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An end plate for a battery module, characterized in that: It includes a first part and a second part that are arranged opposite to each other, and a cavity formed by the first part and the second part. At least one reinforcement structure is provided in the cavity. The reinforcement structure includes a first reinforcement part and a second reinforcement part that are connected. The first reinforcement part is connected to the first part and there is a first gap between the first reinforcement part and the second part. The second reinforcement part is connected to the second part and there is a second gap between the first part. When the end plate is subjected to lateral compression, the first gap provides a buffer space for the movement and deformation of the first reinforcement part, and the second gap provides a buffer space for the movement and deformation of the second reinforcement part.

2. The end plate according to claim 1, characterized in that The reinforcement structure further includes a transition portion, which is connected to both the first reinforcement portion and the second reinforcement portion. An extension direction of the transition portion forms an angle with both the first portion and the second portion.

3. The end plate according to claim 1, wherein: The first reinforcement portion is an arc-shaped structure convex toward the second portion, and the second reinforcement portion is an arc-shaped structure convex toward the first portion.

4. The end plate according to claim 3, characterized in that An angle between a line connecting the center of the first reinforcement portion and the center of the second reinforcement portion and a first direction is 0-90°, and the first direction is a thickness direction of the end plate.

5. The end plate according to claim 2, characterized in that The first reinforcement portion and the second reinforcement portion are both L-shaped structures, or the first reinforcement portion, the transition portion and the second reinforcement portion are formed into a Z-shaped structure.

6. The end plate according to claim 5, characterized in that The included angle between the first reinforcement portion and the transition portion is 45° to 135°, and the included angle between the second reinforcement portion and the transition portion is 45° to 135°.

7. The end plate according to claim 2, characterized in that The first reinforcement portion and the second reinforcement portion are symmetrically arranged with the center position of the transition portion as the center.

8. The end plate according to claim 1, wherein: The ratio of the size of the orthographic projection of the reinforcing structure in the height direction of the end plate to the size of the orthographic projection of the reinforcing structure in the thickness direction of the end plate is 0.5:1 to 1.5:

1.

9. The end plate according to claim 1, wherein: The number of the reinforcement structures N=L / 2W±1, wherein L is the height of the cavity and W is the thickness of the cavity.

10. A battery module, characterized in that: The end plate comprises the end plate according to any one of claims 1 to 9.

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