Battery module, battery pack and method for adjusting the restraining force of battery module

Abstract

The present invention provides a battery module, a battery pack and a method for adjusting the restraining force of a battery module, wherein the battery module comprises a plurality of battery cells; at least two end plates, each of which is provided with at least one first hole group, the first hole group comprising at least two first fixing holes and at least two second fixing holes arranged at intervals; at least one first fastener, which can be arranged through one of the first fixing holes on the first end plate and one of the first fixing holes on the second end plate; and at least one second fastener, one end of which is fixed to one of the second fixing holes on the first end plate, and the other end of which is fixed to one of the second fixing holes on the second end plate.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery module, a battery pack and a method for adjusting the restraining force of the battery module. Background Art

[0002] The battery pack includes a box body and a plurality of battery modules located inside the box body, wherein the battery module is a key component of the battery pack.

[0003] In the related art, the battery module is composed of a plurality of cells arranged in combination. Two end plates are placed on both sides of the battery module to resist the expansion pressure of the cells, and the steel straps are used for pre-tightening to ensure the stability of the overall structure of the battery module. As the number of cycles of the cells increases, the service life of the cells decreases, and the pre-tightening force required by the battery module also changes accordingly, so as to match the optimal use environment of the cell capacity at different times. In the related art, the steel straps configured in the battery module cannot be adjusted. Summary of the invention

[0004] Embodiments of the present invention provide a battery module, a battery pack, and a method for adjusting the restraining force of a battery module, which can improve the problem in the related art that the restraining belt of the battery module cannot be adjusted.

[0005] In a first aspect, an embodiment of the present invention provides a battery module, comprising:

[0006] A battery cell group, comprising a plurality of battery cells, wherein the battery cell group has a first side surface and a second side surface opposite to each other along a thickness direction of the battery cell, the battery cell group has a third side surface and a fourth side surface opposite to each other along a length direction of the battery cell, and the battery cell group has a first end surface and a second end surface opposite to each other along a height direction of the battery cell;

[0007] At least two end plates, at least two of the end plates include a first end plate and a second end plate, the first end plate is arranged on the first side surface, and the second end plate is arranged on the second side surface; at least two first fixing holes are arranged at the end of each of the end plates, at least two of the first fixing holes are arranged to be spaced apart along the thickness direction of the battery cell, and each of the first fixing holes is arranged to pass through both ends of the end plate; at least two second fixing holes are arranged on the side surface of each of the end plates, at least two of the second fixing holes are arranged to be spaced apart along the length direction of the battery cell, and each of the second fixing holes is arranged to pass through one side of the end plate;

[0008] At least one first fastener, each of which is disposed through one of the first fixing holes on the first end plate and one of the first fixing holes on the second end plate, and fastens the battery cell group; and,

[0009] At least one second fastener, one end of the second fastener is fixed to one of the second fixing holes on the first end plate, and the other end of the second fastener is fixed to one of the second fixing holes on the second end plate to tighten the battery cell group.

[0010] In one embodiment, at least the first fastener is arranged to be disposed around the first side surface and the second side surface, and at least one of the second fasteners is arranged to be disposed around the third side surface and / or the fourth side surface.

[0011] In one embodiment, each of the end plates is provided with a plurality of first hole groups, each of the first hole groups includes a plurality of the first fixing holes, and the plurality of the first hole groups are spaced apart along the length direction of the plurality of the battery cells; and / or, each of the end plates is provided with a plurality of second hole groups, each of the second hole groups includes a plurality of the second fixing holes, and the plurality of the second hole groups are spaced apart along the height direction of the battery cells.

[0012] In one embodiment, each of the end plates includes a plurality of first partition walls and a plurality of second partition walls, each of the first partition walls is cross-arranged with a plurality of the second partition walls, two adjacent first fixing holes in each first hole group are separated by a first partition wall, two adjacent first hole groups are separated by a second partition wall, and the second fixing hole passes through at least one of the first partition walls and is connected with at least two of the first fixing holes.

[0013] In one embodiment, the first fixing hole of the first end plate through which the first fastener passes is arranged opposite to the first fixing hole of the second end plate through which the first fastener passes.

[0014] In one embodiment, at least one of the first fasteners includes a first strap and a second strap, the first strap is disposed close to the third side surface, and the second strap is disposed close to the fourth side surface.

[0015] In one embodiment, at least one of the first fasteners includes a first strap and a second strap, the first strap is disposed close to the third side surface, and the second strap is disposed close to the fourth side surface.

[0016] In one embodiment, two ends of the first fastener are respectively provided with a bayonet and a protrusion, and the protrusion can be engaged in the bayonet; or, the two ends of the first fastener are connected by welding.

[0017] In one embodiment, at least one first fastener comprises a first binding belt and a second binding belt, and the first binding belt and the second binding belt are made of different materials.

[0018] In one embodiment, a first snap-in portion is provided at one end of the second fastener, and a second snap-in portion is provided at the other end of the second fastener, the first snap-in portion is snap-connected to the second fixing hole of the first end plate, and the second snap-in portion is snap-connected to the second fixing hole of the second end plate.

[0019] In one embodiment, at least one of the second fasteners includes a first clamp and a second clamp, the first clamp is clamped around the first side of the battery module, and the second clamp is clamped around the second side of the battery module.

[0020] In one embodiment, at least one of the second fasteners includes a third clamp and a fourth clamp, the third clamp is arranged parallel to the first clamp, the fourth clamp is arranged parallel to the second clamp, the third clamp is arranged close to the first end face, and the fourth clamp is arranged close to the second end face.

[0021] In one embodiment, the hole wall of each second fixing hole is provided with a plurality of fixing portions, and the plurality of fixing portions are spaced apart in the axial direction of the second fixing hole, and one end of each second fastener is removably fixed to one of the fixing portions of one of the second fixing holes on the first end plate, and the other end of the second fastener is removably fixed to one of the fixing portions of one of the second fixing holes on the second end plate.

[0022] In one embodiment, the first snap-fit ​​portion and the second snap-fit ​​portion both include a first section and a second section that are bent and connected, the first section abuts against side walls of a plurality of the first partition walls, and the second section abuts against an inner surface of one of the first partition walls.

[0023] In one embodiment, the first section is provided with a first hook portion, and the first hook portion is configured to be bent toward one end of the first section. The first buckle portion or the second buckle portion of the second fastener is configured to be able to drive the first hook portion to move toward the inside of the second fixing hole through a first adjustment tool so that the second fastener is clamped on different first partition walls or clamped in the second fixing hole.

[0024] In one embodiment, the first section is further provided with a second hook portion, and the second hook portion is configured to be bent toward the other end of the first section. The first buckle portion or the second buckle portion of the second fastener is configured to be able to drive the second hook portion to move toward the outside of the second fixing hole through a second adjustment tool so that the second fastener is clamped on different first partition walls or removed from the second fixing hole.

[0025] In one embodiment, an anti-slip portion is further provided on the end plate, and the first fastener or the second fastener is fixed to the anti-slip portion.

[0026] In a second aspect, an embodiment of the present invention provides a battery pack, comprising a plurality of the battery modules described above, and a box body, wherein the plurality of battery modules are disposed in the box body.

[0027] In a third aspect, an embodiment of the present application provides a method for adjusting the restraining force of the above-mentioned battery module, the adjustment method comprising:

[0028] Adjusting the positions of the first straps fixed to different first fixing holes in the same first hole group of the first end plate and the positions of different first fixing holes in the same first hole group of the second end plate; and / or,

[0029] The positions of the second straps fixed to the different first fixing holes in the same first hole group of the first end plate and the positions of the different first fixing holes in the same first hole group of the second end plate are adjusted.

[0030] In one embodiment, the adjustment method further comprises: adjusting the positions of different first hole groups on the first end plate to which the first restraining strap is fixed and the positions of different first hole groups on the second end plate; and / or,

[0031] The positions at which the second straps are fixed to different first hole groups on the first end plate and the positions at different first hole groups on the second end plate are adjusted.

[0032] In one embodiment, the adjustment method comprises: adjusting the positions of different second fixing holes in the same second hole group on the first end plate to which the first clamp is fixed and the positions of different second fixing holes in the same second hole group on the second end plate; and / or,

[0033] The second clamp is fixed to positions of different second fixing holes in the same second hole group on the first end plate and positions of different second fixing holes in the same second hole group on the second end plate by adjusting.

[0034] In one embodiment, the adjustment method comprises: adjusting the positions of different second hole groups on the first end plate to which the first clamp is fixed and the positions of different second hole groups on the second end plate; and / or,

[0035] The second clamp is fixed to different positions of the second hole groups on the first end plate and different positions of the second hole groups on the second end plate by adjusting.

[0036] In one embodiment, the adjustment method comprises: using a first adjustment tool or a second adjustment tool to adjust a fixing depth of the first clamp fixed to the same second fixing hole; and / or,

[0037] The first adjustment tool or the second adjustment tool is used to adjust the fixing depth of the second clamp fixed to the same second fixing hole.

[0038] Beneficial effects of the embodiments of the present application:

[0039] In an embodiment of the present invention, by adjusting the fixing position of the first fixing hole of the first end plate and the fixing position of the first fixing hole of the second end plate by adjusting the first fastener, and by adjusting the fixing position of the second fixing hole of the first end plate and the fixing position of the second fixing hole of the second end plate, the pre-tightening force of the battery module can be adjusted in multiple dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a three-dimensional diagram of a battery module provided in an embodiment of the present application;

[0042] Figure 2 is an exploded view of a battery module provided in an embodiment of the present application from one angle;

[0043] Figure 3 is an exploded view of a battery module provided in an embodiment of the present application from another angle;

[0044] Figure 4 is a three-dimensional diagram of an end plate provided in an embodiment of the present application;

[0045] Figure 5 is a top view of an end plate provided in an embodiment of the present application;

[0046] Figure 6 yes Figure 4 A partial enlarged view of

[0047] Figure 7a This is a diagram of a first state in which a first fastener is fixed to an end plate according to an embodiment of the present application;

[0048] Figure 7b is a diagram of a second state in which a first fastener is fixed to an end plate provided by an embodiment of the present application;

[0049] Figure 7c is a diagram of a third state in which a first fastener is fixed to an end plate provided by an embodiment of the present application;

[0050] Figure 8a is a three-dimensional diagram of a first fastener provided by an embodiment of the present application;

[0051] Figure 8b is a three-dimensional diagram of a first fastener provided in yet another embodiment of the present application;

[0052] Fig. 9 is a three-dimensional diagram of a battery module provided by another embodiment of the present application;

[0053] Fig.10a is a three-dimensional diagram of a second fastener provided by an embodiment of the present application;

[0054] Fig.10b is a three-dimensional diagram of a second fastener provided in yet another embodiment of the present application;

[0055] Fig.11a This is a diagram of a first state in which a second fastener is fixed to an end plate according to an embodiment of the present application;

[0056] Fig.11b is a diagram of a second state in which a second fastener is fixed to an end plate according to an embodiment of the present application;

[0057] Fig.11c is a third state diagram of a second fastener being fixed to an end plate provided by an embodiment of the present application;

[0058] Fig.12 is a stereoscopic diagram of a first adjustment tool provided by an embodiment of the present application adjusting the position of a second fastener toward the inside of a second fixing hole;

[0059] Fig.13 is a stereoscopic diagram of a first adjustment tool provided by an embodiment of the present application acting on a second fastener;

[0060] Fig.14 is a stereoscopic diagram of a second adjusting tool provided by an embodiment of the present application adjusting the position of a second fastener toward the outside of a second fixing hole;

[0061] Fig.15 is a stereoscopic diagram of a second adjustment tool provided by an embodiment of the present application acting on a second fastener;

[0062] Figure Number:

[0063] 1. battery module; 10. battery cell; 11. battery cell group; 121. first side surface; 122. second side surface; 123. third side surface; 124. fourth side surface; 131. first end surface; 132. second end surface;

[0064] 2. end plate; 21. first end plate; 22. second end plate; 23. first hole group; 231. first fixing hole; 24. second hole group; 241. second fixing hole; 251. first partition wall; 252. second partition wall; 253. first fixing part; 254. second fixing part; 26. anti-slip part;

[0065] 3. First fastener; 31. First tie belt; 32. Second tie belt; 33. Bayonet;

[0066] 4. second fastener; 411. first buckle portion; 412. second buckle portion; 421. first clamp; 422. second clamp; 423. third clamp; 424. fourth clamp; 441. first section; 442. second section; 451. first hook portion; 452. second hook portion;

[0067] 51. a first adjustment tool; 52. a second adjustment tool; DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0069] An embodiment of the present application provides a battery pack, which includes a box and a plurality of battery modules, wherein the plurality of battery modules are arranged inside the box.

[0070] Each battery module 1 includes a plurality of battery cells 10, and the plurality of battery cells 10 are arranged side by side to form at least one battery cell group. The battery cells may be in a cubic or cylindrical shape. Figures 1 to 3 As shown, the battery module 1 is composed of a plurality of cubic battery cells 10 arranged side by side to form a battery cell group. The battery module 1 includes an X direction, a Y direction and a Z direction which are perpendicular to each other. The thickness direction of the plurality of battery cells 10 is as shown in FIG. Figure 1In the X direction shown, the height direction of the plurality of battery cells 10 is as shown in FIG. Figure 1 In the Z direction shown, the length direction of each battery cell 10 is as shown in FIG. Figure 1 In the Y direction shown, taking the blade battery module as an example, a plurality of battery cells 10 are stacked along the X direction to form a battery cell group 11, the battery cell group 11 includes a first side surface 121 and a second side surface 122 that are oppositely arranged along the X direction, the battery cell group 11 includes a third side surface 123 and a fourth side surface 124 that are oppositely arranged along the Y direction, and the battery cell group 11 includes a first end surface 131 and a second end surface 132 that are oppositely arranged along the Z direction.

[0071] Each battery module 1 further includes two end plates 2, namely a first end plate 21 and a second end plate 22. The first end plate 21 is disposed on a first side surface 121 of the battery cell group 11, and the second end plate 22 is disposed on a second side surface 122 of the battery cell group 11. The two end plates 2 are respectively placed on both sides of the battery module 1 to resist the expansion pressure generated by the expansion of the multiple battery cells 10.

[0072] In other optional examples, each battery module 1 is provided with multiple end plates 2, that is, in addition to being provided on both sides of the multiple battery cells 10, the end plates 2 can also be provided among the multiple battery cells 10. When the battery cell group 11 includes a large number of battery cells 10, adding end plates 2 among the multiple battery cells 10 can reduce the difficulty of assembling the battery module 1.

[0073] In the related art, the battery cell 10 will act on the two end plates 2 after expansion, thereby causing the structure of the end plates 2 to deform. If the design strength of the end plates 2 themselves is not enough, it will affect the use of the battery module 1. In addition, the cost of replacing the end plates 2 is high.

[0074] Furthermore, in the related art, the battery module 1 also includes a steel tie band, through which the multiple battery cells 10 are pre-tightened, thereby maintaining the stability of the overall structure of the battery module 1. However, the length of the same tie band cannot be changed, so the pre-tightening force of the tie band on the battery module is usually fixed, and too much or too little pre-tightening force will cause poor use of the battery module 1.

[0075] As the number of cycles of the battery cell increases, the service life of the battery cell continues to decrease. Correspondingly, the preload force required by the battery module also changes accordingly to match the optimal usage environment of the battery cell capacity at different times.

[0076] like Figure 1 As shown, in the embodiments of the present application, by improving the end plate structure of the battery module and the structure of the restraining belt, the pre-tightening pressure of the restraining belt can be adjusted to match the optimal use environment of the battery cell capacity at different periods.

[0077] refer to Figures 1 to 4Each end plate 2 is provided with a first hole group 23, and the first hole group 23 includes at least two first fixing holes 231 arranged at intervals, and the at least two first fixing holes 231 are configured to be arranged at intervals along the thickness direction X of the plurality of battery cells 10, and each first fixing hole 231 is configured to extend along the height direction of the battery cell 10 and pass through both ends of the end plate 2.

[0078] The two ends of the end plate 2 may be the opposite upper and lower ends of the end plate 2, or the adjacent upper and left ends of the end plate 2, or the adjacent upper and right ends, or the adjacent lower and left ends, or the adjacent lower and right ends. When the first fixing hole 231 is located at the opposite ends of the end plate 2, the first fixing hole 231 is configured to extend in a straight line. When the first fixing hole 231 is located at the adjacent ends of the end plate 2, the first fixing hole 231 is configured to extend in an oblique line.

[0079] The battery module 1 also includes at least one first fastener 3, each first fastener 3 is constructed to be arranged circumferentially around the first side surface 121, the second side surface 122, the first end surface 131 and the second end surface 132 of the battery cell group 11, and the first fastener 3 is arranged through one of the first fixing holes 231 on the first end plate 21 and one of the first fixing holes 231 on the second end plate 22.

[0080] The pre-tightening force of the battery module 1 is adjusted by adjusting the fixing position of the first fixing hole 231 in the first hole group 23 of the first end plate 21 and the fixing position of the first fixing hole 231 in the first hole group 23 of the second end plate 22.

[0081] For example, in the early stage of the use of the battery module 1, the charging and discharging of the battery module 1 is relatively stable and the expansion degree is small. Correspondingly, the pre-tightening force of the first fastener 3 on the battery module 1 can be set to be smaller, so that the first fastener 3 can be fixed to the first fixing hole 231 in the first hole group 23 of the first end plate 21 that is relatively close to the first side surface 121, and the first fixing hole 231 in the first hole group 23 of the second end plate 22 that is relatively close to the second side surface 122, so that the circumferential restraint pre-tightening force of the first fastener 3 on the battery module 1 is relatively small.

[0082] In the later stage of use of the battery module 1, the charging and discharging of the battery module 1 is unstable, resulting in an aggravated expansion of the battery cell 10. Correspondingly, the pre-tightening force of the first fastener 3 on the battery module 1 can be set to be larger, so that the first fastener 3 can be fixed to the first fixing hole 231 in the first hole group 23 of the first end plate 21 that is relatively far away from the first side surface 121, and the first fixing hole 231 in the first hole group 23 of the second end plate 22 that is relatively far away from the second side surface 122, thereby relatively increasing the circumferential restraining pre-tightening force of the first fastener 3 on the battery module 1.

[0083] The above-mentioned first fastener 3 is mainly configured to pre-tighten the circumferential restraining pre-tightening force of the battery cell group 11. The range of the pre-tightening force of the first fastener 3 includes the first side surface 121, the second side surface 122, the first end surface 131 and the second end surface 132, while no restraining pre-tightening force is provided to the third side surface 123 and the fourth side surface 124 of the battery module 1.

[0084] Therefore, alternatively, in another embodiment provided in the present application, the battery module 1 further includes at least one second fastener 4 , and the second fastener 4 is configured to be disposed around the third side surface 123 and the fourth side surface 124 of the plurality of battery cells 10 .

[0085] At least one second hole group 24 is provided on each end plate 2, and the second hole group 24 includes at least two second fixing holes 241 arranged at intervals, and the at least two second fixing holes 241 are configured to be arranged at intervals along the length direction Y of the battery cell 10, and each second fixing hole 241 is configured to extend along the thickness direction X of the plurality of battery cells 10 and pass through a side surface of the end plate 2.

[0086] At least two second fixing holes 241 are arranged on the side of the end plate 2 and penetrate one side of the end plate 2, wherein the second fixing holes 241 may be located on the front side of the end plate 2, or on the rear side of the end plate 2, or on the left side of the end plate 2, or on the right side of the end plate 2. The second fixing holes 241 may extend along a straight line or along an oblique line.

[0087] One end of the second fastener 4 is fixed to one of the second fixing holes 241 on the first end plate 21 , and the other end of the second fastener 4 is fixed to one of the second fixing holes 241 on the second end plate 22 .

[0088] The pre-tightening force of the battery module 1 is adjusted by adjusting the fixing position of the second fastener 4 fixed to the second fixing hole 241 in the second hole group 24 of the first end plate 21 and the fixing position of the second fixing hole 241 in the second hole group 24 of the second end plate 22.

[0089] For example, in the early stage of the use of the battery module 1, the charging and discharging of the battery module 1 is relatively stable and the expansion degree is small. Correspondingly, the pre-tightening force of the second fastener 4 on the battery module 1 can be set to be smaller, so that the second fastener 4 can be fixed to the second fixing hole 241 in the second hole group 24 of the first end plate 21 that is relatively close to the third side 123 or the fourth side 124, and the second fixing hole 241 in the second hole group 24 of the second end plate 22 that is relatively close to the third side 123 or the fourth side 124, so that the restraining pre-tightening force of the second fastener 4 on the battery module 1 is relatively small.

[0090] In the later stage of use of the battery module 1, the charging and discharging of the battery module 1 is unstable, resulting in an aggravated expansion of the battery cell 10. Correspondingly, the pre-tightening force of the second fastener 4 on the battery module 1 can be set to be larger, so that the second fastener 4 can be fixed to the second fixing hole 241 in the second hole group 24 of the first end plate 21, which is relatively far away from the third side 123 or the fourth side 124, and the second fixing hole 241 in the second hole group 24 of the second end plate 22, which is relatively far away from the third side 123 or the fourth side 124, thereby relatively increasing the lateral restraint pre-tightening force of the second fastener 4 on the battery module 1.

[0091] In an optional embodiment, the battery module 1 is simultaneously provided with a first fastener 3 and a second fastener 4, at least one first hole group 23 is provided at both ends of each end plate 2, and at least one second hole group 24 is provided on one side of each end plate 2, and the pre-tightening force of the battery module 1 on both sides and both ends is adjusted by adjusting the first fastener 3 to fix the first fixing hole 231 in the first hole group 23 of the first end plate 21 and the first fixing hole 231 in the first hole group 23 of the second end plate 22, thereby achieving adjustment of the pre-tightening force of the battery module 1 on both sides and both ends by the first fastener 3, and the pre-tightening force of the battery module 1 on the other two sides by the second fastener 4 is adjusted by adjusting the second fixing hole 241 in the second hole group 24 of the first end plate 21 and the second fixing hole 241 in the second hole group 24 of the second end plate 22.

[0092] Continue to refer Figures 2 to 4 , at least one first hole group 23 disposed at both ends of each end plate 2 includes a plurality of first hole groups 23, and the plurality of first hole groups 23 are disposed at intervals along the length direction of the battery cell group 11, wherein the specific number of the first hole groups 23 can be adaptively adjusted according to the length of the battery cell group 11. In a specific implementation, from the third side surface 123 to the fourth side surface 124 of the battery cell group 11, each end plate 2 is sequentially provided with a first hole group 23A, a first hole group 23B, a first hole group 23C, a first hole group 23D, a first hole group 23E, and a first hole group 23F, and each first hole group 23 includes three first fixing holes 231.

[0093] By adjusting the first hole group 23 to which the first fastener 3 is fixed, the binding force of the battery cells 10 at different positions of the battery module 1 can be adjusted. For example, when the first fastener 3 is fixed to the first hole group 23A or the first hole group 23F, the first fastener 3 is configured to have a stronger binding force on one side of the battery cell 10. When the first fastener 3 is fixed to the first hole group 23C and the first hole group 23D, the first fastener 3 is configured to have a stronger binding force on the middle position of the battery cell 10.

[0094] Continue to refer Figures 2 to 4, at least one second hole group 24 disposed on one side of each end plate 2 includes a plurality of second hole groups 24, and the plurality of second hole groups 24 are disposed at intervals along the height direction of the battery cell group 11, wherein the specific number of the second hole groups 24 can be adaptively adjusted according to the height of the battery cell group 11. In a specific implementation, from the first end surface 131 to the second end surface 132 of the battery cell group 11, each end plate 2 is sequentially provided with a second hole group 24A, a second hole group 24B, and a second hole group 24C, and each second hole group 24 includes three second fixing holes 241.

[0095] By adjusting the second hole group 24 to which the second fastener 4 is fixed, the binding force of the battery cells 10 at different positions of the battery module 1 can be adjusted. For example, when the second fastener 4 is fixed to the second hole group 24A or the second hole group 24C, the second fastener 4 is configured to have a strong binding force on one end of the battery cell 10. When the second fastener 4 is fixed to the second hole group 24B, the second fastener 4 is configured to have a strong binding force on the middle position of the battery cell 10.

[0096] Continue to refer Figures 4 to 6 Each end plate 2 includes a plurality of first partition walls 251 and a plurality of second partition walls 252, each first partition wall 251 is arranged crosswise with a plurality of second partition walls 252, two adjacent first fixing holes 231 in each first hole group 23 are separated by the first partition wall 251, and two adjacent first hole groups 23 are separated by the second partition wall 252. In a specific implementation, each end plate 2 includes six first hole groups 23, each first hole group 23 includes three first fixing holes 231, two first partition walls 251 and five second partition walls 252 are arranged in the end plate 2. Each second fixing hole 241 is arranged through at least one first partition wall 251 and is connected with at least two first fixing holes 231.

[0097] By connecting each second fixing hole 241 with at least two first fixing holes 231, a plurality of fixing portions are formed on the hole wall of each second fixing hole 241, and the plurality of fixing portions are spaced apart in the axial direction of the second fixing hole 241. One end of each second fastener 4 is detachably fixed to one of the fixing portions of one of the second fixing holes 241 on the first end plate 21, and the other end of the second fastener 4 is detachably fixed to one of the fixing portions of one of the second fixing holes 241 on the second end plate 22.

[0098] The above-mentioned multiple fixing parts extend along the axial direction of the second fixing hole 241. By changing the clamping depth of one end of the second fastener 4 on different fixing parts of the same second fixing hole 241, the lateral binding force of the second fastener 4 on the battery cell group 11 is changed.

[0099] In one embodiment, a plurality of fixing portions are provided as the plurality of first partition walls 251, and a plurality of first partition walls 251 are provided on the hole wall where each second fixing hole 241 is located, so that the depth of the second fastener 4 embedded in the second fixing hole 241 can be adjusted, thereby achieving the adjustment of different sizes of lateral pre-tightening forces at the same fixed position of the same battery module. Each second fixing hole 241 is connected to three first fixing holes 231, and correspondingly, two first partition walls 251 are provided inside each second fixing hole 241, namely, a first fixing portion 253 and a second fixing portion 254. The first fixing portion 253 and the second fixing portion 254 have different depth positions corresponding to the second fixing hole 241, so when the second fastener 4 abuts against different fixing portions, the size of the lateral pre-tightening force of the second fastener 4 can be adjusted.

[0100] Continue to refer Figure 5 The projection of each first fixing hole 231 on the end surface of the end plate 2 is a rectangle. The first fastener 3 is set as a tie belt. The tie belt can be made of steel material or hard plastic material. The tie belts made of different materials have different tie forces of the same size. For example, the tie force of the same size steel tie belt is greater than the tie force of the same size plastic tie belt. The corresponding material can be selected according to the size range of the pre-tightening force required by the actual battery module 1.

[0101] In some embodiments, on the same battery module 1, according to the different restraining forces required at different positions of the battery cell 10, at least one first fastener 3 includes a first restraining band 31 and a second restraining band 32, wherein the first restraining band 31 is made of steel material, and the second restraining band 32 is made of plastic material.

[0102] Continue to refer Figure 2 and Figure 3 The first fastener 3 is constructed as a closed rectangle, and the first fixing hole 231 of the first end plate 21 through which the first fastener 3 passes is arranged opposite to the first fixing hole 231 of the second end plate 22 through which the first fastener 3 passes.

[0103] It is understandable that for the first fastener 3 made of hard material, when the first fixing hole 231 through which the first fastener 3 is fixed to the first end plate 21 and the first fixing hole 231 through which the first fastener 3 is fixed to the second end plate 22 are misaligned, the first fastener 3 may be deformed, which is not conducive to the first fastener 3 maintaining a longer service life.

[0104] Continue to refer Figures 1 to 4At least one first fastener 3 includes a first binding belt 31 and a second binding belt 32 . The first binding belt 31 is disposed close to the third side surface 123 of the battery module 1 , and the second binding belt 32 is disposed close to the fourth side surface 124 of the battery module 1 .

[0105] By simultaneously arranging the first binding belt 31 and the second binding belt 32 on a battery module 1 , a more stable binding force is provided to the battery module 1 .

[0106] In other optional embodiments, the number of the first fasteners 3 provided on the same battery module 1 may also be 3, 4, 5, 6 or other numbers.

[0107] Continue to refer Figures 7a to 7c As shown, by adjusting the relative position between the first strap 31 and the second strap 32 and the fixed position of the first strap 31 and the second strap 32, the pre-tightening force of multiple dimensions of the battery module 1 can be adjusted. The method for adjusting the first strap 31 and the second strap 32 includes:

[0108] The first tie band 31 is adjusted to the position of different first fixing holes 231 in the same first hole group 23. For example, in the early stage of the use of the battery module, when the X direction of the left battery cell 10 of the battery module 1 needs to provide a smaller pre-tightening force, the first tie band 31 can be adjusted to the first fixing hole 231 close to the first side surface 121 or the second side surface 122. Figure 7a For example, in the later stage of the use of the battery module 1, when the X direction of the left battery cell 10 of the battery module 1 needs to provide a larger pre-tightening force, the first tie band 31 can be adjusted to be away from the first fixing hole 231 of the first side surface 121 or the second side surface 122, such as adjusting the first tie band 31 to Figure 7b location.

[0109] The second tie band 32 is adjusted to the position of different first fixing holes 231 in the same first hole group 23. For example, in the early stage of the use of the battery module, when the X direction of the right battery cell 10 of the battery module 1 needs to provide a smaller pre-tightening force, the second tie band 32 can be adjusted to the first fixing hole 231 close to the first side 121 or the second side 122, such as adjusting the second tie band 32 to Figure 7a For example, in the later stage of the use of the battery module 1, when the X direction of the right battery cell 10 of the battery module 1 needs to provide a larger pre-tightening force, the second tie band 32 can be adjusted to be away from the first fixing hole 231 of the first side surface 121 or the second side surface 122, such as adjusting the second tie band 32 to Figure 7b location.

[0110] Among them, the method for increasing the pre-tightening force of the first fastener 3 can also include adding at least one new restraining strap, for example, adding a new restraining strap to the front or rear side of the first restraining strap 31 or the second restraining strap 32, so that the first fastener 3 as a whole provides a greater restraining effect on the battery module 1.

[0111] Furthermore, by adjusting the relative position between the first binding band 31 and the second binding band 32, it is possible to provide a suitable pre-tightening force to the battery cells at different positions of the battery module 1. For example, in the early stage of using the battery module 1, the first binding band 31 and the second binding band 32 are respectively arranged close to the third side surface 123 and the fourth side surface 124, and when the battery cell 10 in the middle part of the battery module 1 expands to a large extent, the first binding band 31 and the second binding band 32 can be respectively moved toward the direction of the battery cell 10 in the middle part to adjust to the position as follows: Figure 7c Fixed position shown.

[0112] Continue to refer Figure 8a , the first fastener 3 is constructed as a closed rectangular structure, wherein one end of the first fastener 3 and the other end of the first fastener 3 can be connected by welding. In other optional embodiments, such as Figure 8b The first fastener 3 is provided with a bayonet 33 and a protrusion (not shown) at both ends, wherein the protrusion can be snapped into the bayonet 33, so that the first fastener 3 is constructed as a structure that is easy to disassemble, which is conducive to the position adjustment of the first fastener 3 on different first fixing holes 231.

[0113] Continue to refer Fig. 9 , Fig.10a and Fig.10b The projection of the second fixing hole 241 on the side of the end plate 2 is circular, and the first snap-fit ​​portion 411 and the second snap-fit ​​portion 412 are respectively provided at both ends of the second fastener 4. The first snap-fit ​​portion 411 is snap-fitted to one of the second fixing holes 241 of the first end plate 21, and the second snap-fit ​​portion 412 is snap-fitted to one of the second fixing holes 241 of the second end plate 22.

[0114] By adjusting the fixing position of the first snap portion 411 clamped to the second fixing hole 241 in the first end plate 21, and the fixing position of the second snap portion 412 clamped to the second fixing hole 241 in the second end plate 22, the lateral restraining force of the second fastener 4 on the battery module 1 can be adjusted.

[0115] Specifically, please refer to Fig.11a, the second fastener 4 is set as a first clamp 421, the first clamp portion 411 of the first clamp 421 is clamped to the second fixing hole 241 of the first end plate 21 and the second clamp portion 412 is clamped to the second fixing hole 241 of the second end plate 22, and is basically flush. By adjusting the fixing position of the first clamp portion 411 of the first clamp 421 clamped to different second fixing holes 241 of the same second hole group 24 of the first end plate 21 and the fixing position of the second clamp portion 412 clamped to different second fixing holes 241 of the same second hole group 24 of the second end plate 22, the lateral pre-tightening force of the battery module 1 can be adjusted. For example, in the early stage of the use of the battery module, the lateral restraining force required by the battery module 1 is small, then the first clamp 411 of the first clamp 421 is clamped to the second fixing hole 241 of the first end plate 21 and is arranged close to the third side surface 123, and the second clamp 412 is clamped to the second fixing hole 241 of the second end plate 22 and is arranged close to the third side surface 123. In the later stage of use of the battery module, the battery module 1 requires a larger lateral restraint force, so the first clamp 421 and the first buckle 411 are clamped to the second fixing hole 241 of the first end plate 21 and are arranged away from the third side surface 123, and the second buckle 412 is clamped to the second fixing hole 241 of the second end plate 22 and is arranged away from the third side surface 123.

[0116] Continue to refer Fig.11a and Fig.11cBy adjusting the fixing depth of the first buckle portion 411 of the first clamp 421 clamped to the same second fixing hole 241 of the first end plate 21, and the fixing depth of the second buckle portion 412 clamped to the same second fixing hole 241 of the second end plate 22, the lateral restraining force of the battery module 1 can be finely adjusted. For example, when only the pre-tightening force provided by the first clamp 421 needs to be fine-tuned, the fixing depth of the first clamp 421 clamped to the second fixing hole 241 can be adjusted. In a preferred embodiment, at least two fixing parts are provided inside the second fixing hole 241, and the at least two fixing parts are respectively a first fixing part 253 and a second fixing part 254. When the first snap-in part 411 or the second snap-in part 412 of the first clamp 421 is clamped to the first fixing part 253, the depth at which the first snap-in part 411 or the second snap-in part 412 is clamped to the second fixing hole 241 is shallow. When the first snap-in part 411 or the second snap-in part 412 of the first clamp 421 is clamped to the second fixing part 254, the depth at which the first snap-in part 411 or the second snap-in part 412 is clamped to the second fixing hole 241 is deep. Therefore, when the first clamping portion 411 and the second clamping portion 412 of the first clamping hoop 421 are both clamped to the first fixing portion 253 of the second fixing hole 241, the lateral restraining force provided by the first clamping hoop 421 to the battery module 1 is relatively small, and when the first clamping portion 411 and the second clamping portion 412 of the first clamping hoop 421 are both clamped to the second fixing portion 254 of the same second fixing hole 342, the lateral restraining force provided by the first clamping hoop 421 to the battery module 1 is relatively large.

[0117] Continue to refer Fig.11a and Fig.11b At least one second fastener 4 includes a first clamp 421 and a second clamp 422. The first clamp 421 is clamped around the third side 123, and the second clamp is clamped around the fourth side 124. The clamping position of the first clamp 421 and the clamping position of the second clamp 422 are preferably set to be flush.

[0118] By respectively arranging the first clamp 421 and the second clamp 422 around the third side surface 123 and the fourth side surface 124 on a battery module 1 , a complete lateral restraining force is provided to the lateral direction of the battery module 1 .

[0119] It is understandable that if only the first clamp 421 is disposed around the third side surface 123, the first clamp 421 cannot provide a binding force to the right battery cell 10. Alternatively, if the first clamp 421 and the second clamp 422 are combined into one clamp, the structure of the clamp is relatively complex, and it is difficult to achieve fine adjustment of the binding force of the battery cell 10 on one side.

[0120] Continue to refer Fig.11a and Fig.11bAt least one second fastener 4 further includes a third clamp 423 and a fourth clamp 424 . The third clamp 423 is arranged in parallel with the first clamp 421 , and the fourth clamp 424 is arranged in parallel with the second clamp 422 .

[0121] By setting two clamps around the third side 123, a stable binding effect is provided to the upper end of the left battery cell 10 and the lower end of the left battery cell 10 at the same time. By setting two clamps around the fourth side 124, a stable binding effect is provided to the upper end of the right battery cell 10 and the lower end of the right battery cell 10 at the same time.

[0122] The fixing positions of the first clamp 421, the second clamp 422, the third clamp 423, and the fourth clamp 424 can be adjusted. The relative positions between the first clamp 421 and the third clamp 423, and the relative positions between the second clamp 422 and the fourth clamp 424 can be adjusted.

[0123] For example, three second hole groups 24 are provided on each end plate 2, namely, a second hole group 24A, a second hole group 24B and a second hole group 24C. The first clamp 421 can be fixed to the second hole group 24A, and the third clamp 423 can be fixed to the second hole group 24C. Fig.11a As shown, the upper end and the lower end of the battery cell are provided with a stable binding effect. The first clamp 421 can be fixed to the second hole group 24B, and the third clamp 423 can be fixed to the second hole group 24C. Fig.11b As shown, a stable binding effect is provided to the middle position of the battery cell and the lower end of the battery cell.

[0124] refer to Fig.10a The first snap-fit ​​portion 411 and the second snap-fit ​​portion 412 both include a first section 441 and a second section 442 that are bent and connected, the first section 441 abuts against the side walls of the plurality of first partition walls 251 , and the second section 442 abuts against the inner surface of one of the partition walls 251 .

[0125] By configuring the first snap-in portion 411 and the second snap-in portion 412 as an inwardly bent snap-in structure, the first snap-in portion 411 and the second snap-in portion 412 can be stably snapped onto the second fixing hole 241 , thereby preventing the first snap-in portion 411 and the second snap-in portion 412 from being loosened.

[0126] refer to Fig.10b , Fig.12 and Fig.13The first section 441 is provided with a first hook portion 451, and the first hook portion 451 is configured to be bent toward the outside of the second fixing hole 241. The first buckle portion 411 or the second buckle portion 412 of the second fastener 4 is configured to be driven by the first adjustment tool 51 to move toward the inside of the second fixing hole 241, so that the second fastener 4 is clamped on different first partition walls 251, thereby adjusting the depth position of the first buckle portion 411 or the second buckle portion 412 clamped on the second fixing hole 241. Alternatively, the first buckle portion 411 is driven by the first adjustment tool 51 to move toward the inside of the second fixing hole 241, so that the first buckle portion 411 or the second buckle portion 412 is clamped on the second fixing hole 241.

[0127] refer to Fig.10b , Fig.14 and Fig.15 The first section 441 is also provided with a second hook portion 452, and the second hook portion 452 is configured to be bent toward the inside of the second fixing hole 241. The first buckle portion 411 or the second buckle portion 412 of the second fastener 4 is configured to be driven by the second adjustment tool 52 to move the second hook portion 452 toward the outside of the second fixing hole 241, so that the second fastener 4 is clamped on different first partition walls 251, so as to adjust the depth position of the first buckle portion 411 or the second buckle portion 412 clamped on the second fixing hole 241. Alternatively, the second buckle portion 452 is driven by the second adjustment tool 52 to move toward the outside of the second fixing hole 241, so that the first buckle portion 411 or the second buckle portion 412 is moved out of the second fixing hole 241, so as to facilitate the second fastener 4 to be clamped on different second fixing holes 241.

[0128] Continue to refer Fig.12 and Fig.14 An anti-slip portion 26 is also provided on the end plate 2, and the first fastener 3 or the second fastener 4 is fixed on the anti-slip portion 26, so that the position of the first fastener 3 or the second fastener 4 relative to the battery cell 10 remains fixed, thereby preventing the first fastener 3 or the second fastener 4 from sliding relative to the battery cell 10, thereby preventing the first fastener 3 or the second fastener 4 from being able to provide a stable pre-tightening effect on the battery cell, thereby affecting the use of the battery module 1.

[0129] In a specific embodiment, the anti-slip portion 26 includes two anti-slip protrusions arranged at intervals, and the second fastener 4 is fixed in the interval between the two anti-slip protrusions. An anti-slip portion 26 is provided on one side of the first end plate 21, and an anti-slip portion 26 is also provided on one side of the second end plate 22. The same second fastener 4 is restricted by the anti-slip portion 26 on the first end plate 21 and the anti-slip portion 26 on the second end plate 22 at the same time, so that the position of the second fastener 4 relative to the battery cell 10 remains stable.

[0130] The present application also provides a method for adjusting the restraining force of the above-mentioned battery module, and the adjustment method further includes:

[0131] Adjusting the positions of the first straps fixed to different first fixing holes in the same first hole group of the first end plate and the positions of different first fixing holes in the same first hole group of the second end plate; and / or,

[0132] The positions of the second restraining belt fixed to different first fixing holes in the same first hole group of the first end plate and the positions of different first fixing holes in the same first hole group of the second end plate are adjusted.

[0133] The first restraining band and the second restraining band are used to provide circumferential restraining force to the first side surface, the second side surface, the first end surface and the second end surface of the battery cell group. By fixing the first restraining band and the second restraining band at different positions of the first fixing holes in the same first hole group, different magnitudes of pre-tightening force can be provided to the battery cells at the same position.

[0134] In some embodiments, the above adjustment method further includes:

[0135] Adjust the positions of the first hole groups on the first end plate and the first hole groups on the second end plate; and / or,

[0136] The positions of the second straps fixed to the different first hole groups on the first end plate and the positions of the different first hole groups on the second end plate are adjusted.

[0137] The first restraining band and the second restraining band are used to provide circumferential restraining force to the first side surface, the second side surface, the first end surface and the second end surface of the battery cell group. By fixing the first restraining band and the second restraining band to different first hole groups, suitable pre-tightening force can be provided to the battery cells at different positions.

[0138] In some embodiments, the above adjustment method further includes:

[0139] Adjust the positions of different second fixing holes in the same second hole group on the first end plate to which the first clamp is fixed and the positions of different second fixing holes in the same second hole group on the second end plate; and / or,

[0140] The second clamp is fixed to the positions of different second fixing holes in the same second hole group on the first end plate and the positions of different second fixing holes in the same second hole group on the second end plate by adjusting.

[0141] The first clamp and the second clamp provide circumferential restraining force to the third side and the fourth side of the battery cell group respectively, and by fixing the first clamp and the second clamp to different second fixing holes of the same second hole group, different degrees of lateral pre-tightening force are provided to the battery cells at the same position.

[0142] In some implementations, the above adjustment method further includes:

[0143] Adjusting the position of the first clamp fixed to the different second hole groups on the first end plate and the position of the different second hole groups on the second end plate; and / or,

[0144] The second clamp is fixed to the position of the different second hole group on the first end plate and the position of the different second hole group on the second end plate by adjusting.

[0145] The first clamp and the second clamp provide circumferential binding force to the third side and the fourth side of the battery cell group respectively, and the pre-tightening force at different positions of the battery cell can be adjusted by fixing the first clamp and the second clamp to different second hole groups.

[0146] In some embodiments, the above adjustment method further includes:

[0147] Use the first adjustment tool or the second adjustment tool to adjust the fixing depth of the first clamp fixed to the same second fixing hole; and / or,

[0148] The first adjustment tool or the second adjustment tool is used to adjust the fixing depth of the second clamp in the same second fixing hole.

[0149] By arranging a plurality of first partition walls inside the second fixing hole, when the first buckle portion and the second buckle portion of the first clamp are clamped on the first partition walls at different positions, the depths of the first clamp inserted into the second fixing hole are correspondingly different, so that the restraining force of the first clamp on the same position of the battery cell can be fine-tuned. Compared with the method of adjusting the positions of the first clamp at different second fixing holes in the same second fixing hole group, the fine adjustment effect brought about by changing the fixing depth of the first clamp at the same two fixing holes is more obvious and quicker.

[0150] Similarly, when the first buckle portion and the second buckle portion of the second clamp are clamped on the first partition wall at different positions, the depths of the second clamp inserted into the second fixing hole are different accordingly, so that the binding force of the second clamp on the same position of the battery cell can be fine-tuned. Compared with the method of adjusting the positions of the second clamp at different second fixing holes in the same second fixing hole group, the fine adjustment effect brought about by changing the fixing depth of the second clamp at the same two fixing holes is more obvious and quicker.

[0151] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery module, characterized in that: include: A battery cell group, comprising a plurality of battery cells, wherein the battery cell group has a first side surface and a second side surface opposite to each other along a thickness direction of the battery cell, the battery cell group has a third side surface and a fourth side surface opposite to each other along a length direction of the battery cell, and the battery cell group has a first end surface and a second end surface opposite to each other along a height direction of the battery cell; At least two end plates, at least two of the end plates include a first end plate and a second end plate, the first end plate is arranged on the first side surface, and the second end plate is arranged on the second side surface; at least two first fixing holes are arranged at the end of each of the end plates, at least two of the first fixing holes are arranged to be spaced apart along the thickness direction of the battery cell, and each of the first fixing holes is arranged to pass through both ends of the end plate; at least two second fixing holes are arranged on the side surface of each of the end plates, at least two of the second fixing holes are arranged to be spaced apart along the length direction of the battery cell, and each of the second fixing holes is arranged to pass through one side of the end plate; At least one first fastener, each of which is disposed through one of the first fixing holes on the first end plate and one of the first fixing holes on the second end plate, and fastens the battery cell group; and, At least one second fastener, one end of the second fastener is fixed to one of the second fixing holes on the first end plate, and the other end of the second fastener is fixed to one of the second fixing holes on the second end plate to tighten the battery cell group.

2. The battery module according to claim 1, characterized in that: At least the first fastener is arranged to be disposed around the first side surface and the second side surface, and at least one of the second fasteners is arranged to be disposed around the third side surface and / or the fourth side surface.

3. The battery module according to claim 1, characterized in that: Each of the end plates is provided with a plurality of first hole groups, each of the first hole groups includes a plurality of the first fixing holes, and the plurality of the first hole groups are spaced apart along the length direction of the plurality of the battery cells; and / or each of the end plates is provided with a plurality of second hole groups, each of the second hole groups includes a plurality of the second fixing holes, and the plurality of the second hole groups are spaced apart along the height direction of the battery cells.

4. The battery module according to claim 3, characterized in that: Each of the end plates includes a plurality of first partition walls and a plurality of second partition walls, each of the first partition walls is cross-arranged with a plurality of the second partition walls, two adjacent first fixing holes in each first hole group are separated by a first partition wall, two adjacent first hole groups are separated by a second partition wall, and the second fixing hole passes through at least one of the first partition walls and is connected with at least two of the first fixing holes.

5. The battery module according to claim 1, characterized in that: The first fixing hole of the first end plate through which the first fastener passes is arranged opposite to the first fixing hole of the second end plate through which the first fastener passes.

6. The battery module according to claim 5, characterized in that: At least one of the first fasteners includes a first strap and a second strap, wherein the first strap is disposed close to the third side surface, and the second strap is disposed close to the fourth side surface.

7. The battery module according to claim 5, characterized in that: The two ends of the first fastener are respectively provided with a bayonet and a protrusion, and the protrusion can be engaged in the bayonet; or, the two ends of the first fastener are connected by welding.

8. The battery module according to claim 1, characterized in that: The at least one first fastener comprises a first binding belt and a second binding belt, wherein the first binding belt and the second binding belt are made of different materials.

9. The battery module according to claim 4, characterized in that: A first buckle portion is provided at one end of the second fastener, and a second buckle portion is provided at the other end of the second fastener. The first buckle portion is buckled in the second fixing hole of the first end plate, and the second buckle portion is buckled in the second fixing hole of the second end plate.

10. The battery module according to claim 9, characterized in that: At least one of the second fasteners includes a first clamp and a second clamp, the first clamp is clamped around the third side surface, and the second clamp is clamped around the fourth side surface.

11. The battery module according to claim 10, characterized in that: At least one of the second fasteners includes a third clamp and a fourth clamp, the third clamp is arranged in parallel with the first clamp, the fourth clamp is arranged in parallel with the second clamp, the third clamp is arranged close to the first end face, and the fourth clamp is arranged close to the second end face.

12. The battery module according to claim 9, characterized in that: The hole wall of each second fixing hole is provided with a plurality of fixing parts, and the plurality of fixing parts are spaced apart in the axial direction of the second fixing hole. One end of each second fastener is detachably fixed to one of the fixing parts of one of the second fixing holes on the first end plate, and the other end of the second fastener is detachably fixed to one of the fixing parts of one of the second fixing holes on the second end plate.

13. The battery module according to claim 12, characterized in that: The first buckle portion and the second buckle portion both include a first section and a second section that are bent and connected, the first section abuts against the side walls of the plurality of first partition walls, and the second section abuts against the inner surface of one of the first partition walls.

14. The battery module according to claim 13, characterized in that: The first section is provided with a first hook portion, and the first hook portion is configured to be bent toward one end of the first section. The first buckle portion or the second buckle portion of the second fastener is configured to drive the first hook portion to move toward the inside of the second fixing hole through a first adjustment tool so that the second fastener is clamped on different fixing portions or in the second fixing hole.

15. The battery module according to claim 14, characterized in that: The first section is also provided with a second hook portion, and the second hook portion is configured to be bent toward the other end of the first section. The first buckle portion or the second buckle portion of the second fastener is configured to be able to drive the second hook portion to move toward the outside of the second fixing hole through a second adjustment tool so that the second fastener can be clamped on different fixing portions or removed from the second fixing hole.

16. The battery module according to any one of claims 1 to 15, characterized in that: The end plate is further provided with an anti-slip portion, and the first fastener or the second fastener is fixed to the anti-slip portion.

17. A battery pack, characterized in that: The battery pack comprises a plurality of battery modules according to any one of claims 1 to 14, and a box body, wherein the plurality of battery modules are arranged in the box body.

18. A method for adjusting the restraining force of the battery module according to claim 1, characterized in that: The adjustment method comprises: Adjusting the positions of the first straps fixed to different first fixing holes in the same first hole group of the first end plate and the positions of different first fixing holes in the same first hole group of the second end plate; and / or, The positions of the second straps fixed to the different first fixing holes in the same first hole group of the first end plate and the positions of the different first fixing holes in the same first hole group of the second end plate are adjusted.

19. The method for adjusting the restraining force of a battery module according to claim 18, characterized in that: The adjustment method further comprises: Adjusting the positions of different first hole groups on the first end plate to which the first restraining strap is fixed and the positions of different first hole groups on the second end plate; and / or, The positions at which the second straps are fixed to different first hole groups on the first end plate and the positions at different first hole groups on the second end plate are adjusted.

20. The method for adjusting the restraining force of a battery module according to claim 18 or 19, characterized in that: The adjustment method comprises: Adjusting the positions of different second fixing holes in the same second hole group on the first end plate to which the first clamp is fixed and the positions of different second fixing holes in the same second hole group on the second end plate; and / or, The second clamp is fixed to positions of different second fixing holes in the same second hole group on the first end plate and positions of different second fixing holes in the same second hole group on the second end plate by adjusting.

21. The method for adjusting the restraining force of a battery module according to claim 20, characterized in that: The adjustment method comprises: Adjusting the positions of different second hole groups on the first end plate to which the first clamp is fixed and the positions of different second hole groups on the second end plate; and / or, The second clamp is fixed to different positions of the second hole groups on the first end plate and different positions of the second hole groups on the second end plate by adjusting.

22. The method for adjusting the restraining force of a battery module according to claim 20, characterized in that: The adjustment method comprises: Use a first adjustment tool or a second adjustment tool to adjust the fixing depth of the first clamp fixed to the same second fixing hole; and / or, The first adjustment tool or the second adjustment tool is used to adjust the fixing depth of the second clamp in the same second fixing hole.

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