Battery pack

Abstract

The utility model provides a battery pack which comprises a box body, and the box body comprises a first side wall and a second side wall which are oppositely arranged; the battery module is accommodated in the box body, and the battery module comprises a first end surface and a second end surface which are opposite to each other, and a plurality of side surfaces connected with the first end surface and the second end surface; the first support is used for wrapping the first end face and a part of the multiple side faces, and the first support abuts against the first side wall; the second support is used for wrapping the second end face and the other part of the side faces, and the second support abuts against the second side wall.

Description

Technical Field

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

[0002] The battery pack includes a plastic shell and a soft-pack battery module accommodated inside the plastic shell. The soft-pack battery module is placed in the inner cavity of the plastic shell, and structural adhesive is filled between the battery module and the plastic shell. When the above-mentioned battery pack is used in electrical equipment with high extrusion, the above-mentioned battery pack has weak anti-extrusion ability, which can easily cause multiple batteries in the battery module to be misaligned due to extrusion. Utility Model Content

[0003] The embodiment of the utility model provides a battery pack, which can improve the technical problem of the battery pack's weak anti-extrusion ability.

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

[0005] A box body, the box body comprising a first side wall and a second side wall arranged opposite to each other;

[0006] A battery module, the battery module is accommodated in the box, the battery module comprises a first end face and a second end face opposite to each other and a plurality of side faces connecting the first end face and the second end face;

[0007] A first bracket, used for wrapping the first end surface and a portion of the plurality of side surfaces, the first bracket abutting against the first side wall;

[0008] The second bracket is used to wrap the second end surface and a portion of the plurality of side surfaces, and the second bracket abuts against the second side wall.

[0009] In one embodiment, one of the first bracket and the second bracket is configured as a CCS bracket, the CCS bracket includes a bottom plate and a plurality of side plates connected to the bottom plate, the bottom plate covers the first end surface, the plurality of side plates are configured to be arranged around a portion of the side surface, the CCS bracket includes a plurality of first ribs, the plurality of first ribs are distributed on the bottom plate and the plurality of side plates, the plurality of first ribs are configured to extend between the bottom plate and the inner wall of the box body, or the plurality of first ribs are configured to extend between the side plates and the inner wall of the box body.

[0010] In one embodiment, the CCS bracket includes a pressure relief hole disposed on the bottom plate, and the first ribs are disposed on both sides of the pressure relief hole.

[0011] In one embodiment, one of the first bracket and the second bracket is configured as a CCS bracket, and the other of the first bracket and the second bracket is configured as a fixed bracket.

[0012] In one embodiment, the fixed bracket includes an end plate and a plurality of surrounding walls connected to the end plate, the end plate covers the second end surface, the plurality of surrounding walls are configured to be arranged around another portion of the side surface, and the fixed bracket includes a second rib, and the plurality of second ribs are distributed on the plurality of surrounding walls.

[0013] In one embodiment, the box body also includes a third side wall and a fourth side wall that are relatively arranged, the two ends of the third side wall are respectively connected to one end of the first side wall and the second side wall, the two ends of the fourth side wall are respectively connected to the other end of the first side wall and the second side wall, and a gap is provided between the first side wall or the second side wall or the third side wall or the fourth side wall and the outer surface of the battery module, and the width of the gap is not less than 4 mm.

[0014] In one embodiment, the battery pack further includes a structural adhesive, and the structural adhesive is used to fill a portion of the space.

[0015] In one embodiment, the plurality of side surfaces include a first side surface and a second side surface that are oppositely disposed, and the structural adhesive includes a first portion of structural adhesive, which covers a portion of the first side surface, a portion of the outer surface of the fixing bracket, and a portion of the second side surface.

[0016] In one embodiment, the battery pack further includes a first blocking member and a second blocking member, wherein the first blocking member is disposed on the first side surface for separating the structural adhesive from the CCS bracket, and the second blocking member is disposed on the second side surface for separating the structural adhesive from the CCS bracket.

[0017] In one embodiment, the plurality of side surfaces further include a third side surface and a fourth side surface arranged between the first side surface and the second side surface, the structural adhesive includes a second portion of structural adhesive, the second portion of structural adhesive covers a portion of the third side surface, and the CCS bracket and the fixed bracket cover another portion of the third side surface; and / or the second portion of structural adhesive covers a portion of the fourth side surface, and the CCS bracket and the fixed bracket cover another portion of the fourth side surface.

[0018] In one embodiment, the battery module includes a plurality of batteries and glass fiber glue, and the glass fiber glue is used to fix the plurality of batteries.

[0019] In one embodiment, the battery module is horizontally accommodated inside the box.

[0020] Beneficial effects of the embodiments of the utility model:

[0021] In an embodiment of the utility model, the first end face of the battery module is wrapped by the first bracket, and the second end face of the battery module is wrapped by the second bracket, so that the battery module forms a stable whole before being placed in the box, thereby effectively preventing multiple batteries in the battery module from being misaligned with each other when the battery pack is squeezed, thereby effectively improving the anti-extrusion ability of the battery module. Furthermore, the first bracket abuts against the first side wall of the box, and the second bracket abuts against the second side wall, so that the battery module can be stably placed inside the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 is a three-dimensional diagram of a battery pack provided by an embodiment of the utility model;

[0024] Figure 2 It is a three-dimensional view of a battery pack provided by an embodiment of the utility model after removing the lower box body from one viewing angle;

[0025] Figure 3 This is a three-dimensional view of the battery pack provided by the embodiment of the utility model after the lower box is removed from another viewing angle;

[0026] Figure 4 is a three-dimensional diagram of a battery pack provided by an embodiment of the utility model with the box body removed;

[0027] Figure 5 yes Figure 4 An exploded view of the battery pack;

[0028] Figure 6 is a three-dimensional diagram of a battery module provided by an embodiment of the utility model;

[0029] Figure 7 is a three-dimensional diagram of a CCS bracket provided in an embodiment of the utility model;

[0030] Figure 8 is a three-dimensional diagram of a fixing bracket provided in an embodiment of the utility model;

[0031] Figure Number:

[0032] 100, battery pack; 10, box; 101, upper box; 102, lower box; 11, first side wall; 12, second side wall; 13, third side wall; 14, fourth side wall; 20, battery module; 211, first end face; 212, second end face; 22, side face; 221, first side face; 222, second side face; 223, third side face; 224, fourth side face; 23, battery; 24, fiberglass glue; 30, CCS bracket; 31, bottom plate; 32, side plate; 33, first convex rib; 34, pressure relief hole; 40, fixed bracket; 41, end plate; 42, surrounding wall; 43, second convex rib; 44, heat dissipation hole; 50, structural glue; 51, first part of structural glue; 52, second part of structural glue; 61, first blocking member; 62, second blocking member; DETAILED DESCRIPTION

[0033] 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.

[0034] In the related art, a battery pack includes a plastic case and a soft-pack battery module housed inside the plastic case. The soft-pack battery module is placed in the inner cavity of the plastic case, and structural adhesive is filled between the battery module and the plastic case. When the battery pack is used in electrical equipment with high extrusion conditions, the battery pack has weak anti-extrusion ability, which can easily cause multiple batteries in the battery module to be misaligned due to extrusion.

[0035] In the embodiment of the utility model, the structure of the battery pack is improved to improve the anti-extrusion ability of the battery pack. The inventor found through research that the plastic box can be improved to a die-cast box, thereby improving the anti-deformation ability of the box itself.

[0036] refer to Figures 1 to 4As shown, an embodiment of the utility model provides a battery pack 100, which can be used in electric devices and energy storage systems. The electric devices include but are not limited to electric tools, electric vehicles and electric bicycles. The battery pack 100 includes a box 10, a battery module 20 accommodated in the box 10, a first bracket and a second bracket.

[0037] The box body 10 includes a first side wall 11 and a second side wall 12 that are oppositely disposed.

[0038] See also Figure 5 and Figure 6 The number of battery modules 20 accommodated in the box 10 can be one or more, and the multiple battery modules 20 are arranged side by side or in parallel inside the box 10. The battery module 20 includes multiple batteries 23, and the multiple batteries 23 are arranged in a matrix, wherein the multiple batteries 23 are arranged in series, in parallel or in mixed series so that the battery module 20 has a suitable capacity. The battery module 20 includes a first end face 211 and a second end face 212 opposite to each other and multiple side faces 22 connecting the first end face 211 and the second end face 212.

[0039] The first bracket is used to wrap the first end surface 211 and a part of the side surfaces 22 , and the first bracket abuts against the first side wall 11 . The second bracket is used to wrap the second end surface 212 and a part of the side surfaces 22 , and the second bracket abuts against the second side wall 12 .

[0040] The inventor has improved the fixing method of the battery module 20 so that the battery module 20 forms a stable whole before being placed in the box 10. Specifically, the first end face 211 of the battery module 20 is wrapped by the first bracket, and the second end face 212 of the battery module 20 is wrapped by the second bracket, so that the battery module 20 forms a stable whole before being placed in the box 10, thereby effectively preventing the multiple batteries 23 in the battery module 20 from being misaligned with each other when the battery pack 100 is squeezed, thereby effectively improving the anti-extrusion ability of the battery module 20, and further, the first bracket abuts against the first side wall 11 of the box 10, and the second bracket abuts against the second side wall 12, so that the battery module 20 can be stably placed inside the box 10.

[0041] Further, refer to Figures 1 to 5 As shown, one of the first bracket and the second bracket is configured as a CCS (Cells Contact System-integrated busbar) bracket 30 , and the other of the first bracket and the second bracket is configured as a fixed bracket 40 .

[0042] By fixing the CCS bracket 30 on one end surface of the battery module 20 , in addition to improving the anti-extrusion capability of the battery module 20 , it is also beneficial to fully utilize the internal space of the box body 10 of the battery pack 100 .

[0043] like Figure 6 As shown, taking the square battery module 20 as an example, the square battery module 20 includes a height direction, a length direction and a width direction which are perpendicular to each other, and the first end face 211 and the second end face 212 of the battery module 20 are spaced apart along the height direction of the battery module 20, and the multiple side faces 22 of the above-mentioned battery module 20 include a first side face 221 and a second side face 222 which are relatively arranged along the length direction of the battery module 20, and a third side face 223 and a fourth side face 224 which are relatively arranged along the width direction of the battery module 20, wherein the surface area of ​​the first end face 211 or the second end face 212 is smaller than the surface area of ​​the first side face 221 or the second side face 222, and the surface area of ​​the first end face 211 or the second end face 212 is smaller than the surface area of ​​the third side face 223 or the fourth side face 224. Fixing the CCS bracket 30 on the first end face 211 or the second end face 212 and fixing the fixing bracket 40 on the second end face 212 or the first end face 211 is relative to fixing the CCS bracket 30 and the fixing bracket 40 on the side face 22 of the battery module 20, which is beneficial to reducing the overall length or width of the battery module 20 after the combination of the CCS bracket 30 and the fixing bracket 40.

[0044] Further references Figures 1 to 3 As shown, the battery module 20 is horizontally accommodated inside the box 10 .

[0045] By placing the battery module 20 horizontally inside the box 10, the anti-extrusion capability of the battery module 20 is further improved. Figure 2 As shown, the box 10 includes a length direction X, a width direction Y and a height direction Z that are perpendicular to each other, and the battery module 20 includes a length direction a, a width direction b and a height direction c that are perpendicular to each other. The battery module 20 has a length extending along its length direction a, a width extending along its width direction b, and a height extending along its height direction c, wherein the height of the battery module 20 is generally greater than its width or its length. Therefore, the battery module 20 is placed horizontally inside the box 10, so that the length direction X of the box 10 coincides with the height direction c of the battery module 20, and the height direction Z of the box 10 coincides with the length direction a or the width direction b of the battery module 20, which is conducive to lowering the center of gravity of the battery module 20 as a whole, thereby improving the stability of the battery module 20 as a whole.

[0046] The horizontal storage of the battery module 20 can be understood as the height direction of the battery module 20 does not coincide with the height direction of the box body 10. The box body 10 includes a top wall, a bottom wall, and a first side wall 11, a second side wall 12, a third side wall 13 and a fourth side wall 14 connected between the top wall and the bottom wall, wherein the first side wall 11 and the second side wall 12 are arranged opposite to each other, the third side wall 13 and the fourth side wall 14 are arranged opposite to each other, the interval between the top wall and the bottom wall is configured as the height of the box body 10, the interval between the first side wall 11 and the second side wall 12 is configured as the length or width of the box body 10, and the interval between the third side wall 13 and the fourth side wall 14 is configured as the width or length of the box body 10. The box body 10 generally includes an upper box body 101 and a lower box body 102 connected to each other. The battery module 20 is horizontally accommodated in the box 10, and the length or width of the box 10 is set to be not less than the height of the battery module 20, and the height of the box 10 is set to be not less than the length or width of the battery module 20, thereby effectively reducing the height of the box 10, which is conducive to the miniaturization design of the battery pack 100, and effectively utilizing the internal space of the box 10. When the battery pack 100 is impacted or squeezed, the horizontal battery module 20 is more stable than the vertical battery module 20.

[0047] Further references Figure 4 and Figure 7 As shown, the CCS bracket 30 includes a bottom plate 31 and a plurality of side plates 32 connected to the bottom plate 31, wherein one end of the plurality of side plates 32 is connected to the bottom plate 31, and the other ends of the plurality of side plates 32 are enclosed to form an opening, wherein the plurality of side plates 32 are configured to be arranged around a portion of the side surface 22 of the battery module 20, and the bottom plate 31 is arranged to be attached to the first end surface 211 of the battery module 20.

[0048] The CCS bracket 30 further includes a plurality of first ribs 33, which are spaced apart on the bottom plate 31 of the CCS bracket 30 and the side plates 32, and are configured to extend between the bottom plate 31 and the inner wall of the box 10, or between the side plates 32 and the inner wall of the box 10. The plurality of first ribs 33 form a gap between the outer surface of the CCS bracket 30 and the first side wall 11 or the second side wall 12. The provision of the gap space is conducive to improving the anti-extrusion ability of the battery pack 100, thereby effectively protecting the battery module 20. Furthermore, a bus bar, a collection harness or a collection board usually needs to be fixed on the bottom plate 31 of the CCS bracket 30, and the gap formed between the bottom plate 31 of the CCS bracket 30 and the first side wall 11 or the second side wall 12 of the box 10 is used for fixing the above-mentioned bus bar, the collection harness or the collection board.

[0049] Further references Figure 6As shown, the battery module 20 includes a plurality of batteries 23, wherein the plurality of batteries 23 are arranged side by side to form one or more battery groups, and the plurality of battery groups are arranged side by side to form the battery module 20. In the implementation of the present invention, the battery module 20 includes four batteries 23, and the four batteries 23 are arranged side by side to form a battery group.

[0050] Each battery includes a positive terminal and a negative terminal, wherein at least one of the positive terminal and the negative terminal is disposed on the first end face 211 or the second end face 212. In one example, both the positive terminal and the negative terminal are disposed on the first end face 211, and the CCS bracket 30 is configured to wrap the first end face 211. A plurality of pressure relief holes 34 are also disposed on the bottom plate 31 of the CCS bracket 30, and the plurality of pressure relief holes 34 are used to relieve pressure from the battery module 20. Two groups of first ribs 33 are respectively disposed on both sides of the plurality of pressure relief holes 34, so as to prevent the box body 10 from deforming and blocking the pressure relief holes 34 when the box body 10 of the battery pack 100 is subjected to external compression, thereby causing the explosion-proof performance of the battery pack 100 to fail.

[0051] Further references Figure 4 and Figure 8 As shown, the fixing bracket 40 includes an end plate 41 and four surrounding walls 42 connected to the end plate, one end of the four surrounding walls 42 is connected to the end plate 41, and the other end of the four surrounding walls 42 forms an opening, the end plate 41 covers the second end surface 212, and the four surrounding walls 42 are configured to be arranged around another part of the side surface 22, and the fixing bracket 40 includes a second convex rib 43, and a plurality of the second convex ribs 43 are distributed on the end plate 41 and the surrounding wall 42. By arranging the second convex rib 43 on the outer surface of the fixing bracket 40, a gap is maintained between the fixing bracket 40 and the box body 10, and the gap is conducive to improving the anti-extrusion performance of the battery pack 100.

[0052] The fixing bracket 40 further includes a plurality of heat dissipation holes 44, which are arranged on the end plate 41. The second ribs 43 are also arranged in the intervals between the connected heat dissipation holes 44.

[0053] Further, the box body 10 further includes a third side wall 13 and a fourth side wall 14 arranged opposite to each other, the two ends of the third side wall 13 are respectively connected to one end of the first side wall 11 and the second side wall 12, the two ends of the fourth side wall 14 are respectively connected to the other end of the first side wall 11 and the second side wall 12, and a gap is provided between the first side wall 11 or the second side wall 12 or the third side wall 13 or the fourth side wall 14 and the outer surface of the battery module 20, and the width of the gap is not less than 4 mm. Specifically, the gap can be any value or any range between 4 mm and 10 mm.

[0054] By forming a sufficient interval between the outer surface of the battery module 20 and the first side wall 11, the second side wall 12, the third side wall 13 and the fourth side wall 14 of the box 10, on the one hand, the above interval can form an avoidance space, which is convenient for installing other electrical components, and at the same time, the above interval is conducive to increasing the safety interval between electrical components. On the other hand, when the box 10 of the battery pack 100 is subjected to external or extrusion, the above interval space is used for the box 10 to deform, thereby reducing the deformation of the battery module 20, and effectively reducing the risk of fire and explosion caused by deformation of the battery module 20. When the width of the above interval is less than 4mm, the above interval is not conducive to forming a safety interval between the battery module 20 and the box 10. The upper limit of the above interval can be set according to the overall volume of the battery pack 100 and the capacity required by the battery pack 100. When the overall volume of the battery pack 100 is large, the interval can be appropriately increased, and when the overall volume of the battery pack 100 is small, the interval can be appropriately reduced.

[0055] Furthermore, the battery pack 100 further includes a structural adhesive 50, which is used to fill a portion of the gap. The structural adhesive refers to an adhesive that has high strength, can withstand large loads, is resistant to aging, fatigue, and corrosion, has stable performance within the expected life, and is suitable for bonding strong structural parts.

[0056] By filling the structural adhesive 50 in the above-mentioned gap, on the one hand, it is beneficial for the battery module 20 to be stably bonded to the side wall of the box body 10. On the other hand, the above-mentioned structural adhesive can increase the anti-extrusion ability of the battery module 20 and prevent the battery 23 in the battery module 20 from shifting when subjected to extrusion and vibration impact.

[0057] Further references Figure 2 and Figure 3 As shown, the above-mentioned structural adhesive 50 includes a first part of structural adhesive 51. The coverage of the first part of structural adhesive 51 includes the outer surface of the end plate 41 of the fixed bracket 40, the outer surface of a group of relatively arranged surrounding walls 42 among the four surrounding walls 42, and the outer surface of a part of a group of relatively arranged side surfaces 22 among the four side surfaces 22 of the battery module 20. The coverage of the above-mentioned first part of structural adhesive 51 is roughly U-shaped, which is beneficial to improve the structural strength of the first part of structural adhesive 51.

[0058] Further references Figure 2 and Figure 3 As shown, the battery pack 100 also includes a first blocking member 61 and a second blocking member 62. The first blocking member 61 is arranged on the first side surface 221 to separate the first portion of the structural adhesive 51 from the CCS bracket 30, and the second blocking member 62 is arranged on the second side surface 222 to separate the first portion of the structural adhesive 51 from the CCS bracket 30.

[0059] After the CCS bracket 30 and the fixed bracket 40 are respectively fixed to the two ends of the battery module 20, the battery module 20 is placed inside the box 10, and then the first part of the structural adhesive 51 is filled in the gap between the battery module 20 and the inner wall of the box 10. A first blocking member 61 and a second blocking member 62 are respectively arranged on both sides close to the CCS bracket 30 to prevent the first part of the structural adhesive 51 from entering the CCS bracket 30. It can be understood that when the structural adhesive 50 fills the pressure relief hole 34 on the CCS bracket 30, it will affect the explosion-proof performance of the battery module 20.

[0060] The first blocking member 61 and the second blocking member 62 may be made of easily deformable foam, which is beneficial to improving the anti-extrusion capability of the battery pack 100 .

[0061] The multiple side surfaces of the battery module 20 further include a third side surface 223 and a fourth side surface 224 disposed between the first side surface 221 and the second side surface 222, the structural adhesive 50 includes a second portion of structural adhesive 52, the second portion of structural adhesive 52 covers a portion of the third side surface 223, and the CCS bracket 30 and the fixing bracket 40 cover another portion of the third side surface 223. And / or, the second portion of structural adhesive 52 covers a portion of the fourth side surface 224, and the CCS bracket 30 and the fixing bracket 40 cover another portion of the fourth side surface 224.

[0062] By providing structural adhesive on each side of the battery module 20 , it is advantageous to stably combine the battery module 20 with the box body 10 , thereby improving the mechanical properties of the battery pack 100 .

[0063] The battery module 20 includes a plurality of batteries 23 and a glass fiber glue 24 . The glass fiber glue 24 is used to fix the plurality of batteries.

[0064] The multiple batteries 23 are fixed into a whole by using glass fiber glue 24, so as to prevent the multiple batteries 23 from being misaligned with each other after the battery module 20 is squeezed. Aerogel is also arranged between adjacent batteries 23, which is beneficial to the thermal insulation between the batteries 23.

[0065] 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 pack, characterized in that: include: A box body, the box body comprising a first side wall and a second side wall arranged opposite to each other; A battery module, the battery module is accommodated in the box, the battery module comprises a first end face and a second end face opposite to each other and a plurality of side faces connecting the first end face and the second end face; A first bracket, used for wrapping the first end surface and a portion of the plurality of side surfaces, the first bracket abutting against the first side wall; The second bracket is used to wrap the second end surface and a portion of the plurality of side surfaces, and the second bracket abuts against the second side wall.

2. The battery pack according to claim 1, characterized in that: One of the first bracket and the second bracket is configured as a CCS bracket, the CCS bracket includes a bottom plate and a plurality of side plates connected to the bottom plate, the bottom plate covers the first end surface, the plurality of side plates are configured to be arranged around a portion of the plurality of side surfaces, the CCS bracket includes a plurality of first ribs, the plurality of first ribs are distributed on the bottom plate and the plurality of side plates, the plurality of first ribs are configured to extend between the bottom plate and the inner wall of the box, or the plurality of first ribs are configured to extend between the side plates and the inner wall of the box.

3. The battery pack according to claim 2, characterized in that: The CCS bracket includes a pressure relief hole arranged on the bottom plate, and the first ribs are arranged on both sides of the pressure relief hole.

4. The battery pack according to claim 1, characterized in that: One of the first bracket and the second bracket is configured as a CCS bracket, and the other of the first bracket and the second bracket is configured as a fixed bracket.

5. The battery pack according to claim 4, characterized in that: The fixed bracket includes an end plate and a plurality of surrounding walls connected to the end plate, the end plate covers the second end surface, the plurality of surrounding walls are configured to be arranged around a portion of the plurality of side surfaces, and the fixed bracket includes a second rib, and the plurality of second ribs are distributed on the end plate and the plurality of surrounding walls.

6. The battery pack according to claim 4, characterized in that: The box body also includes a third side wall and a fourth side wall that are arranged opposite to each other, the two ends of the third side wall are respectively connected to one end of the first side wall and the second side wall, the two ends of the fourth side wall are respectively connected to the other end of the first side wall and the second side wall, and a gap is provided between the first side wall or the second side wall or the third side wall or the fourth side wall and the outer surface of the battery module, and the width of the gap is not less than 4 mm.

7. The battery pack according to claim 6, characterized in that: The battery pack further includes a structural adhesive, and the structural adhesive is used to fill a portion of the space.

8. The battery pack according to claim 7, characterized in that: The side surface includes a first side surface and a second side surface that are oppositely arranged, and the structural adhesive includes a first portion of structural adhesive, which covers a portion of the first side surface, a portion of the outer surface of the fixing bracket, and a portion of the second side surface.

9. The battery pack according to claim 8, characterized in that: The battery pack further includes a first blocking member and a second blocking member, wherein the first blocking member is disposed on the first side surface for separating the structural adhesive from the CCS bracket, and the second blocking member is disposed on the second side surface for separating the structural adhesive from the CCS bracket.

10. The battery pack according to claim 8, characterized in that: The side surface also includes a third side surface and a fourth side surface arranged between the first side surface and the second side surface, the structural adhesive includes a second portion of structural adhesive, the second portion of structural adhesive covers a portion of the third side surface, and the CCS bracket and the fixed bracket cover another portion of the third side surface; and / or, the second portion of structural adhesive covers a portion of the fourth side surface, and the CCS bracket and the fixed bracket cover another portion of the fourth side surface.

11. The battery pack according to claim 1, characterized in that: The battery module includes a plurality of batteries and glass fiber glue, and the glass fiber glue is used to fix the plurality of batteries.

12. The battery pack according to any one of claims 1 to 11, characterized in that: The battery module is horizontally accommodated inside the box.

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