Battery module and battery pack

Abstract

The utility model provides a battery module and battery pack, the battery module includes base plate, battery cell subassembly, two end plate and at least one fastener, the fastener includes two cooperation portion and main part, the two cooperation portion is provided on the two end plate respectively, the main part is connected with the two cooperation portion, and the two cooperation portion is connected with the main part. The main body part is fixedly connected with the two end plates; according to the technical scheme, the position of the end plate can be adjusted according to the length of the battery cell assembly in the first direction, so that the problem that the battery module cannot be assembled or is loosened after being assembled due to the fact that the size of the battery cell assembly is out of tolerance or the surface of a battery cell in the battery cell assembly is concave inwards is solved; and the overall assembly of the battery module is firm.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery module and a battery pack. Background Art

[0002] In the related art, multiple battery cells are stacked to form a battery cell assembly, and the battery cell assembly and end plates are bundled together by steel strips to form a battery module. That is, when the battery module is assembled, high requirements are placed on the matching dimensions of the steel strip and the battery cell assembly. When multiple battery cells are stacked in the battery cell assembly, the size deviation will cause the steel strip to be unable to bundle the battery cell assembly, and the concave surface of the battery cells in the battery cell assembly will cause the structure inside the battery module to loosen. Utility Model Content

[0003] The embodiments of the utility model provide a battery module and a battery pack, which can improve the technical problem that the battery module cannot be assembled or becomes loose after assembly due to the size tolerance of the battery cell assembly or the concave surface of the battery cell in the battery cell assembly.

[0004] In a first aspect, an embodiment of the present utility model provides a battery module, comprising:

[0005] A bottom plate extending along a first direction;

[0006] A battery cell assembly, arranged on one side of the bottom plate in a second direction, the second direction intersecting the first direction;

[0007] Two end plates are both slidably mounted on the bottom plate along the first direction, and the two end plates are respectively arranged on opposite sides of the battery core assembly in the first direction; and

[0008] At least one fastener comprises two mating parts and a main body, the two mating parts are respectively arranged on the two end plates, and the main body is connected to the two mating parts so that the main body is fixedly connected to the two end plates.

[0009] In some embodiments, one of the end plate and the base plate is provided with a slide groove extending along the first direction, and the other is provided with a sliding portion, which is slidably installed in the slide groove so that the end plate slides relative to the base plate in the first direction.

[0010] In some embodiments, the slide groove is arranged on one side of the end plate close to the bottom plate in the second direction, and the slide groove runs through two opposite sides of the end plate in the first direction;

[0011] The sliding portion is arranged on a side of the bottom plate close to the end plate in the second direction and extends along the first direction. At least a part of the sliding portion is slidably installed in the sliding groove.

[0012] In some embodiments, the slide groove includes a first sub-groove and a second sub-groove interconnected in the second direction, and the maximum distance between two groove walls of the first sub-groove arranged opposite to each other in the third direction is defined as L1, and the minimum distance between two groove walls of the second sub-groove arranged opposite to each other in the third direction is defined as L2, and the first direction, the second direction and the third direction intersect each other in pairs; wherein L1 and L2 satisfy: L1<L2;

[0013] The sliding portion comprises:

[0014] A first sub-section is fixedly connected to the bottom plate; and

[0015] a second sub-portion, fixedly arranged at an end of the first sub-portion away from the first sub-portion in the second direction, and the second sub-portion protrudes from the first sub-portion in the third direction;

[0016] Wherein, at least a part of the first sub-portion is disposed in the first sub-slot, and at least a part of the second sub-portion is disposed in the second sub-slot.

[0017] In some embodiments, the sliding parts are provided in pairs, and the two sliding parts are arranged at intervals in the third direction; the first direction, the second direction and the third direction are mutually crossed in pairs;

[0018] The battery core assembly is correspondingly arranged between the two sliding parts.

[0019] In some embodiments, the end plate comprises:

[0020] end plate body; and

[0021] Two extension parts, the two extension parts are respectively fixed on two opposite sides of the end plate body in the third direction and are extended along the first direction;

[0022] The sliding groove is correspondingly arranged on the extending portion.

[0023] In some embodiments, the fastener is provided in plurality;

[0024] The plurality of main bodies extend along the first direction, wherein some of the main bodies are arranged between two end plate bodies opposite to each other in the first direction, and another part of the main bodies are arranged between two extension parts opposite to each other in the first direction;

[0025] Wherein, the length of the main body portion arranged between the two end plate bodies in the first direction is greater than the length of the main body portion arranged between the two extension portions in the first direction.

[0026] In some embodiments, the base plate comprises:

[0027] A base plate body, the battery cell assembly is correspondingly arranged on the base plate body; and

[0028] Two connecting parts are fixedly arranged on one side of the bottom plate close to the battery cell assembly in the second direction, the two connecting parts are spaced apart from each other in the third direction, and the two sliding parts are respectively arranged on the two connecting parts;

[0029] The battery core assembly is correspondingly located between the two connecting parts.

[0030] In some embodiments, the main body extends along the first direction and is provided with an external thread, one of the two mating parts is penetrated by a first through hole extending along the first direction, the first through hole is provided with an internal thread, the mating part of the two mating parts provided with the first through hole is threadedly connected to the main body, and the other mating part is fixedly connected to the main body; or

[0031] The main body extends along the first direction and is provided with an external thread. The two matching parts are penetrated by a second through hole extending along the first direction. The second through hole is provided with an internal thread. The main body is threadedly connected with the two matching parts.

[0032] In some embodiments, the battery module further includes a plurality of stoppers, which are respectively arranged on one side of the two end plates away from the battery cell assembly in the first direction and are detachably connected to the bottom plate;

[0033] At least part of the orthographic projection of the limiting member in the first direction is located on the adjacent end plate.

[0034] In a second aspect, an embodiment of the present invention provides a battery pack, which includes the battery module as described above.

[0035] Beneficial effects of the embodiments of the utility model:

[0036] In the technical solution of the utility model, the distance between the two end plates can be adjusted according to the length of the battery cell assembly in the first direction, so that the two end plates can be in close contact with the two sides of the battery cell assembly in the first direction respectively, and then connected with the two matching parts through the main body, so as to fix the two end plates; that is, the position of the end plate can be adjusted according to the length of the battery cell assembly in the first direction to avoid the problem that the battery module cannot be assembled or becomes loose after assembly due to the out-of-tolerance size of the battery cell assembly or the concave surface of the battery cell in the battery cell assembly, so that the overall assembly of the battery module is secure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a three-dimensional schematic diagram of a battery module provided by an embodiment of the utility model;

[0039] Figure 2 is an exploded schematic diagram of a battery module provided by an embodiment of the utility model;

[0040] Figure 3 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0041] Figure 4 It is a structural schematic diagram of an end plate provided in an embodiment of the utility model;

[0042] Figure 5 It is a structural schematic diagram of a bottom plate provided in an embodiment of the utility model;

[0043] Figure 6 It is a three-dimensional schematic diagram of a base plate provided by an embodiment of the utility model;

[0044] Figure 7 It is a three-dimensional schematic diagram of an end plate provided in an embodiment of the utility model;

[0045] Figure 8 It is a cross-sectional schematic diagram of the fastener provided by one embodiment of the utility model after being assembled with two end plates;

[0046] Fig. 9 It is a cross-sectional schematic diagram of the fastener and two end plates after being assembled according to another embodiment of the utility model;

[0047] Fig.10 It is an exploded schematic diagram of a base plate provided in an embodiment of the utility model.

[0048] Reference numerals:

[0049] 100. Battery module; 1. Bottom plate; 11. Bottom plate body; 12. Connecting part; 2. Cell assembly; 21. Cell; 3. End plate; 31. End plate body; 32. Extension part; 4. Slide groove; 41. First sub-groove; 42. Second sub-groove; 5. Sliding part; 51. First sub-part; 52. Second sub-part; 6. Fastener; 61. Main body; 62. Matching part; 7. Limiting part; 8. Liquid cooling chamber; 81. Liquid cooling channel; 9. Liquid inlet; 10. Liquid outlet; 13. Cover plate; 14. First through hole; 15. Second through hole. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, 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 accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0051] In the related art, multiple battery cells are stacked to form a battery cell assembly, and the battery cell assembly and end plates are bundled together by steel strips to form a battery module. That is, when the battery module is assembled, high requirements are placed on the matching dimensions of the steel strip and the battery cell assembly. When multiple battery cells are stacked in the battery cell assembly, the size deviation will cause the steel strip to be unable to bundle the battery cell assembly, and the concave surface of the battery cells in the battery cell assembly will cause the structure inside the battery module to loosen.

[0052] In view of this, the utility model proposes a battery module. Figures 1 to 10Some embodiments of the utility model. As shown in the direction markings in the accompanying drawings, the X direction is the first direction, the Z direction is the second direction, and the Y direction is the third direction. The first direction, the second direction and the third direction intersect each other in pairs, and the angles between the first direction, the second direction and the third direction are not limited, and can be 80°, 85°, 90°, 95°, 100°; preferably, in the following embodiments, the angles between the first direction, the second direction and the third direction are 90° for explanation, that is, a spatial rectangular coordinate system is established by the first direction, the second direction and the third direction to explain some embodiments of the present application; it should be emphasized that the angle between the first direction, the second direction and the third direction is 90° and does not constitute a limitation on the following embodiments of the present application.

[0053] See also Figure 1 to Figure 2 In some embodiments of the present application, the battery module 100 includes a base plate 1 and a battery cell assembly 2, wherein the base plate 1 extends along a first direction X; the battery cell assembly 2 includes a plurality of battery cells 21 arranged along the first direction X.

[0054] In some embodiments, the battery module 100 also includes two end plates 3, and the two end plates 3 are both slidably installed on the base plate 1 along the first direction X, and the two end plates 3 are respectively arranged on opposite sides of the battery cell assembly 2 in the first direction X; that is, the two end plates 3 can move freely in the first direction X, so that the relative distance between the two end plates 3 can be adjusted according to the actual length of the battery cell assembly 2 in the first direction X, thereby ensuring that the two end plates 3 are tightly attached to the two sides of the battery cell assembly 2 in the first direction X.

[0055] In some embodiments, the battery module 100 also includes at least one fastener 6, the fastener 6 includes two mating parts 62 and a main body 61, the two mating parts 62 are respectively arranged on the two end plates 3, and the main body 61 is connected to the two mating parts 62, so that the main body 61 is fixedly connected to the two end plates 3; wherein, the form of connection between the main body 61 and the two mating parts 62 is not limited, and it can be a connection method in which the relative position relationship between the main body 61 and the mating part 62 is adjustable, such as threaded connection, snap connection and other connection methods; it can also be a connection method in which the relative position between the main body 61 and the mating part 62 is not adjustable, such as the main body 61 and the mating part 62 are integrally formed, or welding and other connection methods.

[0056] It can be understood that when the main body 61 and one of the matching parts 62 are connected in a manner in which the relative position is not adjustable, in order to ensure that the fastener 6 can fasten the two end plates 3, the main body 61 and the other matching part 62 are connected in a manner in which the relative position is adjustable.

[0057] In the technical solution of the present utility model, the distance between the two end plates 3 can be adjusted according to the length of the battery cell assembly 2 in the first direction X, so that the two end plates 3 can be in close contact with the two sides of the battery cell assembly 2 in the first direction X respectively, and then connected with the two matching parts 62 through the main body 61, so as to fix the two end plates 3; that is, the position of the end plate 3 can be adjusted according to the length of the battery cell assembly 2 in the first direction X, so as to avoid the problem that the battery module 100 cannot be assembled or becomes loose after assembly due to the size tolerance of the battery cell assembly 2 or the concave surface of the battery cell 21 in the battery cell assembly 2, so that the overall assembly of the battery module 100 is secure.

[0058] It can be understood that after the battery module 100 is assembled, when a gap is generated between the battery cell assembly 2 and the end plate 3 due to the concave surface of the battery cell 21 in the battery cell assembly 2, the connection between the main body 61 and the matching portion 62 can be cancelled, and the distance between the two end plates 3 can be shortened by moving the end plate 3 so that the battery cell assembly 2 and the end plate 3 are in close contact. Finally, the two end plates 3 are fixed by connecting the main body 61 and the matching portion 62, thereby achieving adjustment of the battery module 100 after assembly.

[0059] In some embodiments of the present application, the end plate 3 slides on the base plate 1 by being slidably installed in the slide groove 4; in one embodiment, the slide groove 4 is formed on the end plate 3, and the sliding portion 5 is provided on the base plate 1; in another embodiment, the sliding portion 5 is provided on the end plate 3, and the slide groove 4 is formed on the base plate 1.

[0060] See also Figure 3 In a specific embodiment of the present application, the slide groove 4 is formed on the end plate 3, and the sliding portion 5 is arranged on the bottom plate 1. Since the end plate 3 and the bottom plate 1 are opposite to each other in the second direction Z, the slide groove 4 and the sliding portion 5 are respectively arranged on the side of the end plate 3 and the bottom plate 1 opposite to each other in the second direction Z.

[0061] It is understandable that the slide groove 4 also penetrates the opposite sides of the end plate 3 in the first direction X to ensure that the structure of the end plate 3 itself does not block the cooperation between the sliding portion 5 and the slide groove 4 .

[0062] See also Figure 4 In some embodiments of the present application, the slide groove 4 includes a first sub-groove 41 and a second sub-groove 42 that are interconnected in the second direction Z, and the maximum distance between the two groove walls of the first sub-groove 41 that are oppositely arranged in the third direction Y is defined as L1, and the minimum distance between the two groove walls of the second sub-groove 42 that are oppositely arranged in the third direction Y is defined as L2; ​​wherein, L1 and L2 satisfy: L1<L2; it can be understood that, on the basis of ensuring L1<L2, the groove walls of the first sub-groove 41 and the second sub-groove 42 can be regular planar structures or irregular special-shaped structures, which are not limited here. Specifically, in one embodiment of the present application, the cross section of the slide groove 4 on a plane perpendicular to the first direction X is L-shaped.

[0063] It is necessary to add that, if Figure 4 As shown, the first sub-groove 41 is located in the dotted frame B, and the second sub-groove 42 is located in the dotted frame C; wherein the dotted frame B and the dotted frame C are provided only to facilitate understanding of the relative positions of the first sub-groove 41 and the second sub-groove 42, and are not structural features in the battery module 100.

[0064] For further information, see Figure 5 In some embodiments of the present application, the sliding portion 5 includes a first sub-portion 51 and a second sub-portion 52, the first sub-portion 51 is fixedly connected to the bottom plate 1; the second sub-portion 52 is fixedly arranged at one end of the first sub-portion 51 away from the first sub-portion 51 in the second direction Z, and the second sub-portion 52 is arranged to protrude from the first sub-portion 51 in the third direction Y; that is, it is arranged in this way so that the cross-section of the sliding portion 5 on a plane perpendicular to the first direction X is L-shaped, so that it can match the shape of the slide groove 4, and when the sliding portion 5 is slidably installed in the slide groove 4, at least a portion of the first sub-portion 51 is arranged in the first sub-groove 41, and at least a portion of the second sub-portion 52 is arranged in the second sub-groove 42.

[0065] It can be understood that the slide groove 4 and the sliding portion 5 are both arranged in an L-shape, so that when the end plate 3 is slidably installed on the bottom plate 1, the end plate 3 can be restricted from being separated from the bottom plate 1 in the second direction Z.

[0066] It is necessary to add that, if Figure 5 As shown, the first sub-section 51 is located in the dotted frame D, and the second sub-section 52 is located in the dotted frame E; wherein the dotted frame D and the dotted frame E are provided only to facilitate understanding of the relative positions of the first sub-section 51 and the second sub-section 52, and are not structural features in the battery module 100.

[0067] In some embodiments of the present application, the sliding parts 5 are provided in two numbers, and the two sliding parts 5 are spaced apart in the third direction Y; the battery cell assembly 2 is correspondingly provided between the two sliding parts 5. The sliding parts 5 are provided protruding from the bottom plate 1 in the second direction Z, so the two sliding parts 5 can play a certain limiting role on the battery cell assembly 2 in the third direction Y. On this basis, the sliding grooves 4 on the end plate 3 are also provided in two numbers, and correspond one to one with the positions of the two sliding parts 5 in the second direction Z. The structural form in which the sliding parts 5 are spaced apart in the third direction Y makes it possible for the sliding parts 5 to not interfere with the installation of the battery cell assembly 2.

[0068] For further information, see Figure 5 and Figure 6 The bottom plate 1 includes a bottom plate body 11 and two connecting parts 12, and the battery cell assembly 2 is correspondingly arranged on the bottom plate body 11; the two connecting parts 12 are fixedly arranged on one side of the bottom plate 1 close to the battery cell assembly 2 in the second direction Z, and the two connecting parts 12 are spaced apart from each other in the third direction Y, and the two sliding parts 5 are respectively arranged on the two connecting parts 12; the battery cell assembly 2 is correspondingly located between the two connecting parts 12. Wherein, the structural arrangement of the bottom plate body 11 and the sliding part 5 makes the cross section of the bottom plate 1 perpendicular to the first direction X to be U-shaped, and the battery cell assembly 2 is located between the two connecting parts 12, so as to limit the movement of the battery cell assembly 2 in the third direction Y. Since the connecting part 12 plays a limiting role, the thickness of the connecting part 12 in the third direction Y is greater than the thickness of the sliding part 5 in the third direction Y, thereby strengthening the structural strength of the bottom plate 1.

[0069] See also Figure 7 In some embodiments of the present application, the end plate 3 includes an end plate body 31 and two extensions 32, the two extensions 32 are respectively fixed to the end plate body 31 on opposite sides of the third direction Y, and are extended along the first direction X; the slide groove 4 is correspondingly arranged on the extension 32. Among them, since the extension 32 has a certain length in the first direction X, the slide groove 4 is opened on the extension 32, so that the contact area between the slide groove 4 and the sliding part 5 can be larger, thereby improving the stability of the end plate 3 sliding on the bottom plate 1.

[0070] Please refer again Figure 1 to Figure 2The fasteners 6 are provided in plurality; the two end plates 3 are connected by the plurality of fasteners 6 so that the two end plates 3 are firmly fixed. In order to connect the main body 61 with the two matching parts 62 located on the two end plates 3, the main body 61 extends along the first direction X.

[0071] In addition, since the end plate 3 includes the end plate body 31 and the extension portion 32, in order to ensure that all parts of the end plate 3 can be firmly fixed, the main body 61 is arranged between the two end plate bodies 31 and the two extension portions 32 that are opposite to each other in the first direction X; wherein, since the distance between the extension portions 32 that are opposite to each other in the first direction X is smaller than the distance between the end plate bodies 31 that are opposite to each other in the first direction X, the length of the main body 61 arranged between the two end plate bodies 31 in the first direction X is greater than the length of the main body 61 arranged between the two extension portions 32 in the first direction X.

[0072] In this embodiment, since the length of the main body 61 connecting the two end plate bodies 31 is relatively long, the corresponding main body 61 has limited ability to withstand shear force, and thus an additional main body 61 connecting the two extensions 32 is provided, and the length of the main body 61 connecting the two extensions 32 is relatively short, so that the ability to withstand shear force is improved. The two end plates 3 are fixed by the cooperation of the main bodies 61 of different lengths, thereby improving the structural strength of the battery module 100.

[0073] In order to achieve the relative fixation of the two end plates 3, the present application proposes the following two fixing solutions for the main body 61 and the matching portion 62:

[0074] See also Figure 8 In one embodiment of the present application, the main body 61 is provided with an external thread, one of the two matching parts 62 is penetrated by a first through hole 14 extending along the first direction X, and the first through hole 14 is provided with an internal thread, and the matching part 62 provided with the first through hole 14 among the two matching parts 62 is threadedly connected to the main body 61, and the other matching part 62 is fixedly connected to the main body 61; that is, one matching part 62 is fixedly connected to the main body 61 and installed on one of the end plates 3, and the other matching part 62 is installed on the other end plate 3, and the threaded connection between the main body 61 and the matching part 62 is realized by the external thread located on the main body 61 and the internal thread in the first through hole 14, so that the battery cell assembly 2 and the two end plates 3 are firmly fixed.

[0075] Among them, the matching part 62 without the first through hole 14 can be fixed with the main body 61 to form a bolt or a bolt-like structure, that is, the matching part 62 is the head of the bolt, and the main body 61 is the screw part of the bolt; the matching part 62 with the first through hole 14 is a nut or a nut-like structure, which is not limited here.

[0076] See also Fig. 9 In another embodiment of the present application, the main body 61 is provided with an external thread, and the two matching parts 62 are penetrated by a second through hole 15 extending along the first direction X, and the second through hole 15 is provided with an internal thread, and the main body 61 and the two matching parts 62 are both threadedly connected. That is, the main body 61 and the two matching parts 62 located on the two end plates 3 can be threadedly connected, so that the battery cell assembly 2 and the two end plates 3 are firmly fixed.

[0077] The main body portion 61 may be a screw or a structure similar to a screw, and the two matching portions 62 may be nuts or a structure similar to a nut, which is not limited here.

[0078] In addition, in some embodiments of the present application, the battery module 100 further includes a plurality of stoppers 7, which are respectively arranged on the side of the two end plates 3 away from the battery cell assembly 2 in the first direction X, and are detachably connected to the bottom plate 1; at least part of the orthographic projection of the stoppers 7 in the first direction X is located on the adjacent end plates 3. That is, in this embodiment, the stoppers 7 can form a stopper for the end plates 3 in the first direction X, thereby preventing the end plates 3 from coming off the bottom plate 1 in the first direction X; and in order to facilitate the normal detachment of the end plates 3 from the bottom plate 1, the stoppers 7 are set in a detachable form, and then the battery module 100 can be disassembled by first disassembling the stoppers 7 and then disassembling the end plates 3; wherein, the detachable form between the stoppers and the bottom plate is not limited, and can be screwed or clamped.

[0079] See also Fig.10 In some embodiments of the present application, a liquid cooling cavity 8 is provided on the bottom plate 1, and the liquid cooling cavity 8 includes a plurality of liquid cooling channels 81, and the plurality of liquid cooling channels 81 extend along the third direction Y and are spaced apart from each other in the first direction X, and two adjacent liquid cooling channels 81 are connected to each other; the bottom plate 1 includes a liquid inlet 9 and a liquid outlet 10, and the liquid inlet 9 and the liquid outlet 10 are provided at opposite ends of the bottom plate 1 in the first direction X, and are connected to adjacent liquid cooling channels 81. The arrangement of the liquid cooling channels 81 can increase the heat exchange area between the liquid cooling cavity 8 and the battery cell assembly 2, and improve the heat exchange efficiency between the liquid cooling cavity 8 and the battery cell assembly 2.

[0080] In order to facilitate the processing of the liquid cooling cavity 8 on the base plate 1, a cover plate 13 is also provided on the base plate body 11 of the base plate 1. After the base plate body 11 is processed on the side away from the battery cell assembly 2 in the second direction Z to form a cavity, the cavity is covered by the cover plate 13 to form the liquid cooling cavity 8.

[0081] The utility model further proposes a battery pack, which includes a battery module 100. The battery module 100 is as described above. Since the battery pack adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0082] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article 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 and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method 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 bottom plate extending along a first direction; A battery cell assembly is arranged on one side of the bottom plate in the second direction, the battery cell assembly includes a plurality of battery cells arranged along the first direction, and the second direction intersects the first direction; Two end plates are both slidably mounted on the bottom plate along the first direction, and the two end plates are respectively arranged on opposite sides of the battery core assembly in the first direction; and At least one fastener comprises two mating parts and a main body, the two mating parts are respectively arranged on the two end plates, and the main body is connected to the two mating parts so that the main body is fixedly connected to the two end plates.

2. The battery module according to claim 1, characterized in that: One of the end plate and the bottom plate is provided with a slide groove extending along the first direction, and the other one is provided with a sliding part, which is slidably installed in the slide groove so that the end plate slides relative to the bottom plate in the first direction.

3. The battery module according to claim 2, characterized in that: The slide groove is arranged on one side of the end plate close to the bottom plate in the second direction, and the slide groove runs through two opposite sides of the end plate in the first direction; The sliding portion is arranged on a side of the bottom plate close to the end plate in the second direction and extends along the first direction. At least a part of the sliding portion is slidably installed in the sliding groove.

4. The battery module according to claim 3, characterized in that: The slide groove includes a first sub-groove and a second sub-groove interconnected in the second direction, and the maximum distance between two groove walls of the first sub-groove arranged opposite to each other in the third direction is defined as L1, and the minimum distance between two groove walls of the second sub-groove arranged opposite to each other in the third direction is defined as L2, and the first direction, the second direction and the third direction intersect each other in pairs; wherein L1 and L2 satisfy: L1<L2; The sliding portion comprises: A first sub-section is fixedly connected to the bottom plate; and a second sub-portion, fixedly arranged at an end of the first sub-portion away from the first sub-portion in the second direction, and the second sub-portion protrudes from the first sub-portion in the third direction; Wherein, at least a part of the first sub-portion is disposed in the first sub-slot, and at least a part of the second sub-portion is disposed in the second sub-slot.

5. The battery module according to claim 3, characterized in that: The sliding parts are provided in two, and the two sliding parts are arranged at intervals in the third direction; the first direction, the second direction and the third direction intersect each other in pairs; the battery cell assembly is correspondingly arranged between the two sliding parts; The plurality of slide grooves are provided, and the two slide grooves are provided in a one-to-one correspondence with the two sliding parts in the second direction.

6. The battery module according to claim 5, characterized in that: The end plate comprises: end plate body; and Two extension parts, the two extension parts are respectively fixed on two opposite sides of the end plate body in the third direction and are extended along the first direction; The sliding groove is correspondingly arranged on the extending portion.

7. The battery module according to claim 6, characterized in that: The fasteners are provided in plurality; The plurality of main bodies extend along the first direction, wherein some of the main bodies are arranged between two end plate bodies opposite to each other in the first direction, and another part of the main bodies are arranged between two extension parts opposite to each other in the first direction; Wherein, the length of the main body portion arranged between the two end plate bodies in the first direction is greater than the length of the main body portion arranged between the two extension portions in the first direction.

8. The battery module according to claim 5, characterized in that: The bottom plate comprises: A base plate body, the battery cell assembly is correspondingly arranged on the base plate body; and Two connecting parts are fixedly arranged on one side of the bottom plate close to the battery cell assembly in the second direction, the two connecting parts are spaced apart from each other in the third direction, and the two sliding parts are respectively arranged on the two connecting parts; The battery core assembly is correspondingly located between the two connecting parts.

9. The battery module according to any one of claims 1 to 8, characterized in that: The main body extends along the first direction and is provided with an external thread, one of the two matching parts is penetrated by a first through hole extending along the first direction, the first through hole is provided with an internal thread, the matching part of the two matching parts provided with the first through hole is threadedly connected to the main body, and the other matching part is fixedly connected to the main body; or The main body extends along the first direction and is provided with an external thread. The two matching parts are penetrated by a second through hole extending along the first direction. The second through hole is provided with an internal thread. The main body is threadedly connected with the two matching parts.

10. The battery module according to any one of claims 1 to 8, characterized in that: The battery module further comprises a plurality of stoppers, which are respectively arranged on one side of the two end plates away from the battery cell assembly in the first direction and are detachably connected to the bottom plate; At least part of the orthographic projection of the limiting member in the first direction is located on the adjacent end plate.

11. A battery pack, characterized in that: Comprising a battery module as claimed in any one of claims 1 to 10.

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