Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device.According to the battery pack, a buffer part is arranged in a containing cavity of a box body, the box body comprises two side walls oppositely arranged in the first direction, a battery single body comprises two side faces oppositely arranged in the first direction, and the buffer part comprises a first wall and a second wall oppositely arranged in the first direction; the first wall abuts against the adjacent side face of the battery single body, and after the battery single body is connected with the buffer piece through the first glue pouring cavity, when the battery single body expands in the first direction to generate extrusion force, the first wall can deform and get close to the second wall in the first direction to absorb the extrusion force generated by expansion of the battery single body; the second wall abuts against the adjacent side wall of the box body, the outside of the box body is collided or extruded to generate impact force in the first direction, the second wall can deform and get close to the first wall in the first direction to absorb the impact force, the situation that the internal structure of the battery pack is damaged due to external collision is avoided, and the use safety of the battery pack is guaranteed.

Description

Technical Field

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

[0002] The various road conditions encountered by vehicles during driving are testing the stability of the battery pack in terms of mechanical properties, especially in terms of box protection. When the existing battery pack is subjected to external squeezing or collision in its length direction, the internal structure cannot absorb the impact force generated by the external squeezing or collision, resulting in damage to the internal structure of the battery pack and safety risks. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electrical device to solve the problem that the internal structure of the current battery pack cannot absorb the impact force received by the battery pack in its length direction, resulting in damage to the internal structure.

[0004] A first aspect of an embodiment of the present application provides a battery pack, the battery pack having a first direction and a third direction intersecting each other, the battery pack comprising: a box body, a receiving cavity is provided inside the box body, the box body having a side wall; a battery cell is arranged in the receiving cavity, the battery cell has a side surface, and the side surface is arranged opposite to the side wall along the first direction; a buffer, the buffer is arranged between the side surface and the side wall adjacent to each other in the first direction, the buffer has a first wall and a second wall arranged opposite to each other along the first direction, and a first end surface and a second end surface arranged opposite to each other along the third direction; a first receiving groove is provided on a side of the first wall away from the second wall, an end of the first receiving groove close to the first end surface in the third direction passes through the first end surface along the third direction, the first wall abuts against the adjacent side surface to define a first glue injection cavity for injecting glue in the first receiving groove; the second wall abuts against the adjacent side wall; wherein a buffer cavity is defined between the first wall and the second wall, the buffer cavity extends along the third direction, and one of the first wall and the second wall can be deformed after being squeezed and approaches the other along the first direction to achieve buffering.

[0005] Optionally, a second accommodating groove is provided on a side of the second wall facing away from the first wall, and the second accommodating groove has an end close to the first end face in the third direction that passes through the first end face along the third direction; the second wall abuts against the adjacent side wall, and a second glue pouring cavity for pouring glue is defined in the second accommodating groove.

[0006] Optionally, the battery pack also has a second direction, and the first direction, the second direction and the third direction intersect each other; the battery pack also includes at least two heat conductive plates, the heat conductive plates extend along the first direction, at least two of the heat conductive plates are arranged at intervals along the second direction, and a receiving cavity is defined between at least two of the heat conductive plates, and at least one battery cell is arranged in the receiving cavity; the number of the buffer members is at least three, and at least three of the buffer members are arranged at intervals along the second direction, and there is a gap between two adjacent buffer members along the second direction; the heat conductive plate includes a first connecting end and a second connecting end arranged opposite to each other along the first direction, and the first connecting end and the second connecting end are respectively inserted in the adjacent gaps in the first direction.

[0007] Optionally, the battery pack further includes a liquid inlet pipe and a liquid outlet pipe, the first connection end is connected via the liquid inlet pipe, and the second connection end is connected via the liquid outlet pipe; the buffer cavities in at least three of the buffer components are connected along the second direction to form a channel, the liquid inlet pipe is arranged in the channel where the first connection end is located, and / or the liquid outlet pipe is arranged in the channel where the second connection end is located.

[0008] Optionally, the buffer member includes a partition and a first reinforcement rib, the partition is arranged in the buffer cavity; one end of the partition in the first direction abuts against the first wall, and the other end of the partition in the first direction abuts against the second wall, so as to divide the buffer cavity into a first chamber and a second chamber arranged at intervals along the third direction; the first reinforcement rib is arranged in the second chamber, the first wall is connected to the partition through the first reinforcement rib, and the second wall is connected to the partition through the first reinforcement rib.

[0009] Optionally, the buffer member includes a first buffer portion and a second buffer portion; the first buffer portion includes the first wall and the second wall, and the buffer cavity is defined between the first wall and the second wall; the first buffer portion also includes a first end face and a second end face arranged opposite to each other along the third direction, and the second buffer portion is arranged at one end of the inner side of the buffer cavity close to the first end face in the third direction; the second buffer portion includes a first wall surface and a second wall surface arranged opposite to each other along the first direction, the first wall surface abuts against the first wall, and the second wall surface abuts against the second wall.

[0010] Optionally, among at least three of the buffer members, there is a first gap between two of the first buffer portions adjacent along the second direction, and there is a second gap between two of the second buffer portions adjacent along the second direction, and the first gap is connected to the second gap along the third direction to form the gap; the first connection end and the second connection end are respectively inserted into the first gaps adjacent to each other in the first direction.

[0011] Optionally, support portions are respectively protruded from opposite surfaces of the first wall and the second wall, and the two support portions are relatively arranged along the first direction; the second buffer portion includes a third wall surface and a fourth wall surface relatively arranged along the third direction, the fourth wall surface and the two support portions are overlapped along the third direction, and the two support portions cooperate to form support for the second buffer portion in the buffer cavity.

[0012] Optionally, a third through hole is provided on the second buffer portion, and the third through hole penetrates the second buffer portion along the third direction, and the third through hole is connected to the buffer cavity; the first buffer portion also includes a second reinforcing rib, and the second reinforcing rib is arranged on the inner side of the buffer cavity at one end close to the second end face in the third direction, and the first wall and the second wall are connected through the second reinforcing rib.

[0013] Optionally, the buffer member includes a first end face and a second end face arranged opposite to each other along the third direction; at least three of the buffer members are interconnected at one end close to the first end face in the third direction to form a buffer assembly; the box body includes two side walls arranged opposite to each other along the second direction, and the opposite ends of the buffer assembly in the second direction are respectively abutted against the adjacent side walls.

[0014] Optionally, the battery pack also has a second direction, and the first direction, the second direction and the third direction intersect each other; the buffer includes a first end face and a second end face oppositely arranged along the third direction; the number of the buffer is at least three, and at least three of the buffers are spaced apart along the second direction; the first wall has two side edges oppositely arranged along the second direction, and two adjacent side edges of the first walls adjacent to each other in the second direction are respectively provided with clamping parts, and the clamping parts are arranged at one end of the side edge close to the second end face in the third direction; the clamping part protrudes from the side edge along the second direction, and the clamping parts on the two adjacent side edges along the second direction are oppositely arranged.

[0015] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery pack as described above.

[0016] In summary, the embodiments of the present application provide a battery pack and an electrical device having the battery pack, wherein the battery pack is provided with a buffer in a receiving cavity of a box body, the box body includes two side walls arranged oppositely along a first direction, the battery cell includes two side surfaces arranged oppositely along the first direction, and the buffer includes a first wall and a second wall arranged oppositely along the first direction, and a first end surface and a second end surface arranged oppositely along a third direction. A first receiving groove is provided on a side of the first wall facing away from the second wall, and the first wall abuts against the adjacent side surface to define a first glue injection cavity for injecting glue in the first receiving groove. Through the first glue injection cavity, the battery cell can be connected to the buffer in the first direction, thereby improving the connection stability and firmness between the battery cell and the buffer, and the glue injection area and amount can be accurately controlled, thereby reducing material costs and assembly processes. The first wall abuts against the adjacent side surface of the battery cell, and after the battery cell is connected to the buffer component through the first glue filling cavity, when the battery cell expands in the first direction and generates an extrusion force, the first wall can be deformed and approached to the second wall along the first direction to absorb the extrusion force generated by the expansion of the battery cell, thereby achieving buffering of the extrusion force; the second wall abuts against the adjacent side wall of the box body, and the outside of the box body is collided or squeezed to generate an impact force along the first direction, the second wall can be deformed and approached to the first wall along the first direction to absorb the impact force, thereby achieving buffering of the impact force, thereby avoiding damage to the internal structure of the battery pack due to external collision, thereby ensuring the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 Exploded diagram of

[0020] Figure 3 This is a schematic diagram of the first structure of a buffer component in a battery pack provided in an embodiment of the present application;

[0021] Figure 4 is a schematic structural diagram of a buffer assembly composed of a first type of buffer member in a battery pack provided in an embodiment of the present application;

[0022] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at point A;

[0023] Figure 6 yes Figure 4 A top view of

[0024] Figure 7 yes Figure 4 A front view of

[0025] Figure 8 yes Figure 7 Side view of

[0026] Fig. 9 It is a schematic diagram of the assembly structure of the buffer component and the battery pack as well as the heat conducting plate, the liquid inlet pipe and the liquid outlet pipe in the battery pack provided in the embodiment of the present application;

[0027] Fig.10 It is a schematic diagram of the assembly structure of the buffer component, the battery pack and the box body in the battery pack provided in the embodiment of the present application;

[0028] Fig.11 is a schematic structural diagram of a buffer assembly composed of a second type of buffer member in a battery pack provided in an embodiment of the present application;

[0029] Fig.12 yes Fig.11 Exploded diagram of

[0030] Fig.13 yes Fig.11 A front view of

[0031] Fig.14 yes Fig.13 Side view of

[0032] Fig.15 yes Fig.11 A top view of

[0033] Fig.16 is a schematic diagram of the connection structure of the first buffer part among multiple second buffer parts in the battery pack provided by the embodiment of the present application;

[0034] Fig.17 is a schematic diagram of the connection structure of the second buffer parts in a plurality of second buffer parts in the battery pack provided in an embodiment of the present application;

[0035] Fig.18 It is a schematic diagram of the assembly structure of the buffer assembly composed of the second buffer component in the battery pack provided in the embodiment of the present application, the battery pack, the heat conducting plate, the liquid inlet pipe and the liquid outlet pipe;

[0036] Fig.19 It is a schematic diagram of the assembly structure of a buffer component, a battery pack and a box body composed of a second type of buffer member in a battery pack provided in an embodiment of the present application;

[0037] Fig. 20It is a schematic diagram of the assembly structure of the heat conducting plate, the liquid inlet pipe and the liquid outlet pipe in the battery pack provided in the embodiment of the present application;

[0038] Fig.21 It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0039] Description of main reference numerals:

[0040] 1. Battery pack;

[0041] 10. box body, 101. accommodating chamber, 11. side wall, 111. first side wall, 112. second side wall, 12. side wall, 121. first side wall, 122. second side wall, 13. first end wall, 131. first opening, 14. second end wall, 141. second opening;

[0042] 20. Battery cell, 21. Side, 211. First side, 212. Second side, 213. Third side, 214. Fourth side, 22. First side, 23. Second side;

[0043] 30. Buffer member, 30a. Buffer assembly, 300. Buffer cavity, 310. First chamber, 320. Second chamber, 301. First wall, 3011. Side, 3012. Clamping portion, 3013. First connecting portion, 302. Second wall, 303. First end surface, 304. Second end surface, 305. Support portion, 306. Third wall;

[0044] 311, first containing groove, 3111, first glue pouring cavity, 3112, first bottom wall, 3113, first through hole, 321, second containing groove, 3211, second glue pouring cavity, 3212, second bottom wall, 3213, second through hole;

[0045] 31. gap, 32. channel, 33. partition, 331. first reinforcing rib, 34. first buffer portion, 340. first buffer component, 35. second buffer portion, 350. second buffer component, 351. first wall, 3511. third glue pouring cavity, 352. second wall, 3521. fourth glue pouring cavity, 353. third wall, 354. fourth wall, 3541. third through hole, 355. second connecting portion, 36. first gap, 37. second gap, 38. second reinforcing rib;

[0046] 40. heat conducting plate, 401. accommodating cavity, 41. first connecting end, 42. second connecting end, 43. liquid inlet pipe, 44. liquid outlet pipe;

[0047] 50, bottom plate, 51, receiving part;

[0048] 60. Cover plate.

[0049] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and beneficial effects of this application clearer, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

[0055] The present embodiment provides an electrical device, including a battery pack. The battery pack is used to provide electrical energy. The electrical device may be a ship, a vehicle, etc. The vehicle is a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The main body of the vehicle is provided with a drive motor, which is electrically connected to the battery pack, and the battery pack provides electrical energy. The drive motor is connected to the wheels on the main body of the vehicle through a transmission mechanism, thereby driving the vehicle to move forward. In addition, the battery pack can also be used in electrical devices such as energy storage cabinets to provide electrical energy.

[0056] In some embodiments, a battery pack 1 is provided, referring to Figure 1 to Figure 21 The battery pack 1 includes: a box body 10, a battery cell 20 and a buffer 30. The battery pack 1 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figure 1 and Figure 2 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other. The first direction X is the length direction of the box 10 , the second direction Y is the width direction of the box 10 , and the third direction Z is the height direction of the box 10 .

[0057] In some embodiments, reference Figure 2 , the box body 10 is provided with a receiving cavity, referring to Figure 1-2 as well as Fig.10 and Fig.19 The box body 10 includes a side wall 11. Specifically, the box body 10 includes two side walls 11 arranged opposite to each other along a first direction X. Specifically, the two side walls 11 include a first side wall 111 and a second side wall 112. The box body 10 also includes two side walls 12 arranged opposite to each other along a second direction Y. The two side walls 12 include a first side wall 121 and a second side wall 122. The box body 10 also includes a first end wall 13 and a second end wall 14 arranged opposite to each other along a third direction Z. The first side wall 111, the first side wall 121, the second side wall 112 and the second side wall 122 enclose a shell body with two ends open along the third direction Z. The first end wall 13 and the second end wall 14 respectively cover the two ends open of the shell body in the third direction Z. Figure 2 The first end wall 13 defines a first opening 131 communicating with the accommodating cavity 101 , and the second end wall 14 defines a second opening 141 communicating with the accommodating cavity 101 .

[0058] Reference Figure 2 , Figure 9-10 as well as Figure 18-19 The battery cell 20 is disposed in the receiving chamber 101, referring to Fig.21 The battery cell 20 has a side surface 21. Specifically, the battery cell 20 has two side surfaces 21 that are oppositely arranged along a first direction X. The two side surfaces include a first side surface 211 and a second side surface 212. Along the first direction X, the first side surface 211 of the battery cell 20 is adjacent to the first side wall 111 of the box body 10, and the second side surface 212 is adjacent to the second side wall 112.

[0059] Reference Figures 2 to 19 The buffer member 30 is disposed in the accommodating cavity 101 of the box body 10, and the buffer member 30 is disposed between the side surface 21 of the battery cell 20 adjacent to each other in the first direction X and the side wall 11 of the box body 10. Specifically, in some implementations, refer to Fig.10 The buffer member 30 is disposed between the first side surface 211 and the first side wall 111. In some implementations, refer to Fig.19 The buffer member 30 is disposed between the second side surface 212 and the second side wall 112. In some implementations, refer to Figure 2 A buffer member 30 is disposed between the first side surface 211 and the first side wall 111 , and a buffer member 30 is also disposed between the second side surface 212 and the second side wall 112 , which are specifically disposed according to actual design requirements. Figure 3 , Figure 6 , Figure 8 , Figures 11 to 16 The buffer member 30 includes a first wall 301 and a second wall 302 that are oppositely disposed along the first direction X. Along the first direction X, the first wall 301 abuts against the adjacent side surface 21, and the second wall 302 abuts against the adjacent side wall 11. Figure 3 , Fig.12 , Fig.14 and Fig.16 A buffer cavity 300 is provided inside the buffer member 30, and the buffer cavity 300 extends along the third direction Z. One of the first wall 301 and the second wall 302 can approach the other along the first direction X after being squeezed. Specifically, in some implementations, the first wall 301 can approach the second wall 302 along the first direction X after being squeezed. In some implementations, the second wall 302 can approach the first wall 301 along the first direction X after being squeezed. In some implementations, both the first wall 301 and the second wall 302 can approach each other along the first direction X after being squeezed.

[0060] In some embodiments, reference Figure 3-4 , Figure 7-Figure 8 , Figure 12-13 as well as Fig.16 The buffer member 30 includes a first end surface 303 and a second end surface 304 arranged opposite to each other along the third direction Z. Figure 3-4 as well as Figure 6-7 A first receiving groove 311 is formed on the first wall 301 on a side away from the second wall 302 in the first direction X. The first receiving groove 311 passes through the first end surface 303 along the third direction Z at one end close to the first end surface 303. Fig.10 Along the first direction X, the first wall 301 abuts against the side surface 21 of the adjacent battery cell 20, and defines a first glue pouring cavity 3111 for pouring glue in the first accommodating groove 311. The battery cell 20 and the buffer component 30 can be connected by injecting potting glue, foaming glue or structural glue into the first glue pouring cavity 3111, thereby improving the connection stability and firmness between the battery cell 20 and the buffer component 30, and can accurately control the glue pouring area and glue pouring amount, thereby reducing material costs and assembly processes.

[0061] The battery packs in existing electrical devices may encounter shaking or be subjected to external extrusion, collision, etc. during use. In particular, when the battery pack case is subjected to external force impact such as extrusion or collision in its length direction, the relatively long length causes the internal structure of the battery pack case to generate a large impact force, and the internal structure of the existing battery pack case cannot absorb the impact force generated by external extrusion or collision, resulting in damage to the internal structure of the battery pack, affecting the service life and safety of the battery pack.

[0062] The battery pack 1 provided in the embodiment of the present application is provided with a buffer 30 between the side 21 of the battery cell 20 adjacent to each other in the first direction X and the side wall 11 of the box body 10. The first wall 301 of the buffer 30 is provided with a first receiving groove 311 on a side away from the second wall 302. The first receiving groove 311 passes through the first end face 303 along the third direction Z at one end close to the first end face 303. The first wall 301 abuts against the adjacent side 21 to define a first glue injection cavity 3111 for injecting glue in the first receiving groove 311. Through the first glue injection cavity 3111, the battery cell 20 can be connected to the buffer 30 in the first direction, thereby improving the connection stability and firmness between the battery cell 20 and the buffer 30. The second wall 302 in the first direction X abuts against the side wall 11 of the adjacent box body 10, and a buffer cavity 300 is arranged inside the buffer member 30 to form an energy absorption buffer area, and the buffer cavity 300 extends along the third direction Z, so that when the side wall 11 of the box body 10 of the battery pack 1 is collided or squeezed to generate an impact force transmitted along the first direction X, the second wall 302 abutting against the side wall 11 can be deformed and approach the first wall 301 along the first direction X, so as to absorb the impact force exerted on the side wall 11 with the help of the buffer cavity 300, thereby achieving buffering of the impact force and forming protection for components arranged inside the box body 10, such as the battery cell 20, to avoid damage to the internal structure of the battery pack 1 due to external collision, thereby ensuring the safety and service life of the battery pack 1. In addition, during the cycle of the battery cell 20, when the side surface 21 expands and squeezes the first wall 301 abutting against it, the first wall 301 can be deformed and move closer to the second wall 302 along the first direction X, so as to absorb the squeezing force generated by the expansion of the battery cell 20 with the help of the buffer cavity 300, thereby buffering the squeezing force, protecting the battery cell 20, and improving the service life and safety of the battery cell 20. Moreover, the setting of the buffer member 30 in the box body 10 can replace the crossbeam to protect the battery cell 20, thereby improving the space utilization rate inside the box body 10 and improving the energy density of the battery pack 1.

[0063] In some embodiments, reference Fig.21The battery cell 20 includes a first side surface 211 and a second side surface 212 that are opposite to each other along a first direction X, a third side surface 213 and a fourth side surface 214 that are opposite to each other along a second direction Y, and a first surface 22 and a second surface 23 that are opposite to each other along a third direction Z. The first side surface 211, the third side surface 213, the second side surface 212, and the fourth side surface 214 enclose a shell having two openings along the third direction Z. The first surface 22 and the second surface 23 respectively cover the two openings of the shell in the third direction Z. The third side surface 213 and the fourth side surface 214 are the two surfaces with the largest surface areas of the battery cell 20. The first wall 301 of the buffer member 30 adjacent to the first side surface 211 abuts against the first side surface 211, and the first wall 301 of the buffer member 30 adjacent to the second side surface 212 abuts against the second side surface 212, thereby forming a buffer and absorption of the extrusion force generated by the expansion of the abutting first side surface 211 and the second side surface 212.

[0064] In some embodiments, the first side 211 and the second side 212 are the sides with the largest surface area of ​​the battery cell 20, the first side 211 and the second side 212 have the largest expansion amplitude and generate the largest extrusion force, the first wall 301 of the buffer 30 adjacent to the first side 211 abuts against the first side 211, and the first wall 301 of the buffer 30 adjacent to the second side 212 abuts against the second side 212, thereby forming a buffer and absorption of the extrusion force generated by the expansion of the abutting first side 211 or the second side 212 through deformation.

[0065] In some embodiments, reference Figure 3-4 as well as Figure 6-7 The second wall 302 of the buffer member 30 has a second receiving groove 321 on a side away from the first wall 301 in the first direction X. The second receiving groove 321 passes through the first end surface 303 along the third direction Z at one end close to the first end surface 303. Fig.10 , along the first direction X, the second wall 302 abuts against the side wall 11 of the adjacent box body 10, as shown in FIG. Fig.10 In the illustrated embodiment, the second wall 302 abuts against the first side wall 111, and a second glue potting cavity 3211 for storing glue is defined in the second accommodating groove 321. Potting glue, foaming glue or structural glue can be injected into the second glue potting cavity 3211 to connect the box body 10 and the buffer component 30, thereby improving the connection stability and firmness between the box body 10 and the buffer component 30, and accurately controlling the glue potting area and glue potting amount, thereby reducing material costs and assembly processes.

[0066] In some embodiments, reference Figure 4 and Figure 7The number of buffer members 30 in the battery pack 1 is at least three, and at least three buffer members 30 are arranged at intervals along the second direction Y. There is a gap 31 between two adjacent buffer members 30 along the second direction Y. Specifically, refer to Figure 4 The first wall 301 of the buffer 30 includes two side edges 3011 arranged opposite to each other along the second direction Y, and a gap 31 is formed between the two adjacent side edges 3011 of the first walls 301 of two adjacent buffers 30. Similarly, the second wall 302 of the buffer 30 includes two side edges arranged opposite to each other along the second direction Y, and a gap 31 is formed between the two adjacent side edges of the second walls 302 of two adjacent buffers 30. Figure 4 and Figure 7 In the illustrated embodiment, there are nine buffer members 30 , which are spaced apart along the second direction Y. There is a gap 31 between two adjacent buffer members 30 , and the number of gaps 31 is eight. In other words, the gaps 31 correspond one to one with the heat conducting plates 40 .

[0067] Reference Figure 2 , Figure 9-10 as well as Figure 18 to Figure 20 The battery pack 1 further includes at least two heat conducting plates 40, the heat conducting plates 40 extending along the first direction X, and at least two heat conducting plates 40 are disposed in the accommodating cavity 101 of the box body 10 and spaced apart along the second direction Y, referring to Fig. 20 A receiving cavity 401 is defined between at least two heat conducting plates 40, and at least one battery cell 20 is disposed in the receiving cavity 401. Figure 2 , Figure 9-10 as well as Figure 18-19 In the illustrated embodiment, the number of heat conducting plates 40 in the battery pack 1 is eight, which are spaced apart along the second direction Y. An accommodating cavity 401 is defined between two adjacent heat conducting plates 40. The number of battery cells 20 in two adjacent heat conducting plates 40 is six. The six battery cells 20 are arranged along the first direction X and are also spaced apart along the second direction Y to form a battery pack to increase the capacity of the battery pack 1. In other implementations, the number of heat conducting plates 40 and the number of battery cells 20 can be selected according to usage requirements.

[0068] In some embodiments, the heat conductive plate 40 abuts against the third side surface 213 or the fourth side surface 214 of the battery cell 20 along the second direction Y. The third side surface 213 and the fourth side surface 214 are the surfaces with the largest surface area of ​​the battery cell 20. The heat conductive plate 40 abuts against the third side surface 213 or the fourth side surface 214, which can improve the heat exchange effect on the battery cell 20, improve the thermal management efficiency of the battery pack 1, and thereby improve the service life of the battery pack 1.

[0069] Reference Fig. 20, the heat conducting plate 40 includes a first connection end 41 and a second connection end 42 which are arranged opposite to each other along the first direction X. The first connection end 41 of the heat conducting plate 40 is inserted in the gap 31 adjacent to each other in the first direction X, and the second connection end 42 is inserted in the gap 31 adjacent to each other in the first direction X. The setting of the gap 31 between adjacent buffers 30 provides an insertion space for the first connection end 41 and the second connection end 42 of the heat conducting plate 40. The first connection end 41 and the second connection end 42 are inserted in the gap 31 adjacent to each other in the first direction X. The buffer 30 can be used to limit and fix the heat conducting plate 40, thereby ensuring the stability of the heat conducting plate 40 in the box 10, and further ensuring the stability of the battery cells 20 between the heat conducting plates 40. Moreover, the first connection end 41 and the second connection end 42 are inserted in the gap 31 adjacent to each other in the first direction X, which can improve the space utilization rate in the box 10, and further improve the energy density of the battery pack 1. In addition, the provision of the gap 31 can also prevent the buffer assembly 30 a from interfering with the heat conducting plate 40 when being installed in the box body 10 , thereby improving the convenience of assembling the battery pack 1 .

[0070] In some embodiments, reference Figure 4 , Figure 6 and Figure 7 At least three buffer components 30 are arranged at intervals along the second direction Y, and two adjacent buffer components 30 along the second direction Y are connected in sequence through the first connecting portion 3013 to form a buffer assembly 30a. Specifically, two adjacent side edges 3011 of two adjacent buffer components 30 are connected near the first end face 303 in the third direction Z through the first connecting portion 3013. At least three buffer components 30 are connected through the first connecting portion 3013 to form an integrated structure, which improves the processing convenience of the buffer components 30 and reduces the manufacturing cost.

[0071] In some embodiments, reference Fig.10 The two ends of the buffer component 30a in the second direction Y are respectively abutted against the side walls 12 adjacent to the box body 10. Specifically, one end of the buffer component 30a in the second direction Y is abutted against the first side wall 121, and the other end of the buffer component 30a in the second direction Y is abutted against the second side wall 122. When the side wall 12 of the box body 10 is impacted by an external force along the second direction Y, the buffer component 30a can buffer and absorb the impact force in the second direction Y through deformation, thereby protecting the box body 10 and improving the service life of the box body 10.

[0072] In some embodiments, reference Figure 2 , Figure 9-10 as well as Fig.18 , Fig. 20The battery pack 1 also includes a liquid inlet pipe 43 and a liquid outlet pipe 44. The first connection ends 41 of at least two heat conducting plates 40 are connected through the liquid inlet pipe 43, and the second connection ends 42 are connected through the liquid outlet pipe 44. A flow channel (not shown in the figure) for the flow of a heat conducting medium is provided in the heat conducting plate 40. The liquid inlet pipe 43, the heat conducting plate 40 and the liquid outlet pipe 44 are combined to form a thermal management component. The heat conducting medium enters the flow channel through the liquid inlet pipe 43 and flows out through the liquid outlet pipe 44 to realize a circulation flow inside the heat conducting plate 40, thereby forming a temperature control of the battery cell 20, so that the battery cell 20 can be circulated and used within a suitable temperature range, thereby improving the service life and safety of the battery cell 20.

[0073] In some embodiments, reference Figure 4 and Figure 8 The buffer cavities 300 in at least three buffer members 30 are connected along the second direction Y to form a channel 32, referring to Fig. 9 The liquid inlet pipe 43 is arranged in the channel 32 where the first connecting ends 41 of the multiple heat conducting plates 40 are located. Specifically, the first connecting end 41 is provided with a liquid inlet hole (not shown in the figure) for inserting the liquid inlet pipe 43, and the first connecting end 41 is inserted in the gap 31. The liquid inlet hole is located in the channel 32, and the liquid inlet pipe 43 is arranged in the channel 32 where the first connecting end 41 is located, so that the buffer cavity 300 of the buffer component 30 can also accommodate the liquid inlet pipe 43 when it serves as a buffer energy absorption zone to absorb the impact force and / or expansion force in the first direction X, thereby improving the space utilization inside the box body 10, and providing protection for the liquid inlet pipe 43, avoiding the liquid inlet pipe 43 from being affected by the impact force in the first direction X, and improving the service life of the liquid inlet pipe 43.

[0074] In some embodiments, reference Fig.18 The liquid outlet pipe 44 is arranged in the channel 32 where the second connection ends 42 of the plurality of heat conducting plates 40 are located, and a liquid outlet hole (not shown in the figure) for inserting the liquid outlet pipe 44 is opened on the second connection end 42, and the second connection end 42 is inserted in the gap 31, and the liquid inlet hole is located in the channel 32, and the liquid outlet pipe 44 is arranged in the channel 32 where the second connection end 42 is located, so that the buffer cavity 300 of the buffer component 30 can also accommodate the liquid outlet pipe 44 when serving as a buffer energy absorption zone to absorb the impact force and / or expansion force in the first direction X, thereby improving the space utilization rate inside the box body 10, and providing protection for the liquid outlet pipe 44, avoiding the liquid outlet pipe 44 from being affected by the impact force in the first direction X, and improving the service life of the liquid outlet pipe 44.

[0075] In some embodiments, reference Figure 3 and Figure 6The buffer member 30 also includes a partition 33, which is arranged in the buffer cavity 300. One end of the partition 33 in the first direction X abuts against the first wall 301, and the other end of the partition 33 in the first direction X abuts against the second wall 302, so as to divide the buffer cavity 300 into a first chamber 310 and a second chamber 320 spaced apart along a third direction Z. Among the multiple buffer members 30 spaced apart along the second direction Y, the second chambers 320 of the buffer members 30 are connected in sequence along the second direction Y to form a channel 32. The arrangement of multiple partitions 33 can enhance the overall strength of the buffer member 30 and improve the service life of the buffer member 30. The partition 33 is an elastic member, so as not to affect the movement of the first wall 301 and the second wall 302 along the first direction X. In addition, the partition 33 is provided to form a mounting groove between the partition 33 and the first end face 303 while forming the second chamber 320. The mounting groove can play a role of fixing and connecting when the internal assembly wiring harness of the battery pack 1 or the front and rear drive long aluminum / copper busbars are arranged along the second direction Y at the edge of the box body 10 close to the side wall 11, thereby improving the space utilization of the box body 10 and further improving the energy density of the battery pack 1.

[0076] In some embodiments, reference Figure 3 and Figure 8 The buffer member 30 further includes a first reinforcing rib 331, which is disposed in the second chamber 320 and is inclined relative to the first wall 301 to form an oblique rib. Figure 3 The first wall 301 is connected to the partition 33 through the first reinforcing rib 331, and the second wall 302 is connected to the partition 33 through the first reinforcing rib 331. The first reinforcing rib 331 not only strengthens the strength of the first wall 301 and the second wall 302, but also ensures that the buffer 30 is more likely to collapse and deform when squeezed, thereby more effectively absorbing the extrusion energy generated by the external impact force in the first direction X, thereby improving the safety of the battery pack 1.

[0077] In some embodiments, the first reinforcing rib 331 extends along the first direction X, that is, one end of the first reinforcing rib 331 in the first direction X abuts against the first wall 301, and the other end of the first reinforcing rib 331 in the first direction X abuts against the second wall 302, forming a straight rib structure of the first reinforcing rib 331, thereby better strengthening the overall structural strength of the buffer 30 and improving the service life of the buffer 30.

[0078] In some embodiments, reference Figure 4 and Figure 5 At least three buffer members 30 are arranged at intervals along the second direction Y, and the first wall 301 of the buffer member 30 includes two side edges 3011 arranged opposite to each other along the second direction Y. Figure 5, two adjacent side edges 3011 of two first walls 301 adjacent in the second direction Y are respectively provided with a clamping portion 3012, specifically, the clamping portion 3012 is provided at one end of the side edge 3011 close to the second end face 304 in the third direction Z, the clamping portion 3012 is protrudingly provided on the side edge 3011 along the second direction Y, the clamping portions 3012 on the two adjacent side edges 3011 along the second direction Y are relatively arranged, the first connecting end 41 and the second connecting end 42 of the heat conducting plate 40 are respectively inserted in the adjacent gaps 31 in the first direction X, the clamping portion 3012 is connected to the adjacent first connecting end 41 and the second connecting end 42 to form a support for the adjacent first connecting end 41 and the second connecting end 42, the buffer 30 is made of metal material, the buffer 30 is conductive, and while further improving the stability of the buffer 30 restricting and fixing the heat conducting plate 40, the heat conducting plate 40 and the box body 10 are connected to each other at the same time.

[0079] In some embodiments, the material of the buffer 30 may be plastic material, fireproof and heat-insulating material or metal material. The use of plastic material helps to improve the thermal insulation performance of the battery pack 1, and allows the buffer 30 to undergo elastic deformation when subjected to impact force and / or extrusion force. After the impact force and / or extrusion force disappears, the elastic deformation of the buffer 30 also disappears, that is, the deformation of the buffer 30 is generated following the external force (impact force and / or extrusion force) to increase the service life of the buffer 30; the use of fireproof and heat-insulating material helps to improve the thermal diffusion protection capability of the battery pack 1, and the use of metal material helps to improve the overall strength of the battery pack 1.

[0080] In some embodiments, the buffer 30 may be made of a pultruded composite material, which can meet the requirements of thermal insulation and fire prevention while meeting the requirements of strength and extrusion resistance, and can enable the buffer 30 to undergo elastic deformation when subjected to impact force and / or extrusion force. After the impact force and / or extrusion force disappears, the elastic deformation of the buffer 30 also disappears, that is, the deformation of the buffer 30 is generated following the external force (impact force and / or extrusion force) to increase the service life of the buffer 30.

[0081] In some embodiments, reference Figures 11 to 17 The buffer member 30 includes a first buffer portion 34 and a second buffer portion 35, referring to Figure 11 to Figure 14 and Fig.16 The first buffer portion 34 includes a first wall 301 and a second wall 302, and a buffer cavity 300 is defined between the first wall 301 and the second wall 302. Figure 11 to Figure 13 and Fig.16 The first buffer portion 34 includes a first end surface 303 and a second end surface 304 arranged opposite to each other along the third direction Z. Fig.11 and Fig.14The second buffer portion 35 is disposed at one end of the inner side of the buffer cavity 300 close to the first end surface 303 in the third direction Z. Specifically, the second buffer portion 35 is inserted into one end of the inner side of the buffer cavity 300 close to the first end surface 303 in the third direction Z. Fig.12 and Fig.14 The second buffer portion 35 includes a first wall surface 351 and a second wall surface 352 which are arranged opposite to each other along the first direction X. The first wall surface 351 abuts against the first wall 301, and the second wall surface 352 abuts against the second wall 302. The second buffer portion 35 is inserted into the first buffer portion 34 to form the buffer member 30, and the buffer member 30 is divided into two parts. The first buffer portion 34 and the second buffer portion 35 can be formed and processed separately, which can reduce the difficulty of the forming process of the buffer member 30, improve the feasibility of later assembly, and reduce the manufacturing cost. Among them, the first buffer portion 34 and the second buffer portion 35 can be connected and fixed by means of clamping, welding, screwing or adhesive connection.

[0082] In some embodiments, reference Figure 11 to Figure 13 as well as Figure 16-17 At least three buffer members 30 are arranged at intervals along the second direction Y, a first gap 36 exists between two adjacent first buffer portions 34 along the second direction Y, and a second gap 37 exists between two adjacent second buffer portions 35 along the second direction Y, referring to Fig.11 The second buffer portion 35 is inserted into the buffer cavity 300 of the first buffer portion 34 along the third direction Z, and the first gap 36 and the second gap 37 are connected along the third direction Z to form a gap 31. Fig. 9 The first connection end 41 of the heat conducting plate 40 is inserted into the first gap 36 adjacent to the first direction X, referring to Fig.18 , the second connection end 42 of the heat conducting plate 40 is inserted into the adjacent first gap 36 in the first direction X. Thus, the heat conducting plate 40 is restricted and fixed, the stability of the heat conducting plate 40 in the box 10 is improved, and the space utilization rate in the box 10 is improved, and the energy density of the battery pack 1 is improved. In addition, the buffer 30 can be prevented from interfering with the heat conducting plate 40 when installed in the box 10, and the convenience of assembling the battery pack 1 is improved.

[0083] In some embodiments, reference Fig.12 and Fig.14 The first wall 301 and the second wall 302 of the first buffer portion 34 are respectively provided with a support portion 305 protruding therefrom, referring to Fig.12 , Fig.14 and Fig.17 The second buffer portion 35 includes a third wall surface 353 and a fourth wall surface 354 which are arranged opposite to each other along the third direction Z. Fig.14The fourth wall 354 and the two support parts 305 are overlapped along the third direction Z, and the two support parts 305 cooperate to form support for the second buffer part 35 in the buffer cavity 300, thereby forming a positioning for the assembly of the second buffer part 35 in the buffer cavity 300, thereby improving the assembly stability and accuracy.

[0084] In some embodiments, reference Figure 11-12 , Fig.15 as well as Fig.17 A third through hole 3541 is provided on the second buffer portion 35, and the third through hole 3541 penetrates the second buffer portion 35 along the third direction Z. The third through hole 3541 is communicated with the buffer cavity 300 along the third direction Z. The opening of the third through hole 3541 can not only reduce the overall weight of the buffer 30, but also form an anti-extrusion buffer space. When the battery pack 1 is impacted in the first direction X, the first wall 351 can be deformed and approach the second wall 352 along the first direction X to achieve buffering of the impact force, thereby absorbing the impact force on the side wall 11 of the box body 10. When the side surface 21 of the battery cell 20 expands, the second wall 352 can be deformed and approach the first wall 351 along the first direction X to achieve buffering of the extrusion force generated by the expansion, thereby improving the service life of the battery pack 1.

[0085] In some embodiments, reference Fig.16 The first buffer portion 34 also includes a second reinforcing rib 38, which is disposed at one end of the inner side of the buffer cavity 300 in the third direction Z close to the second end face 304, and the first wall 301 and the second wall 302 are connected by the second reinforcing rib 38. The setting of the second reinforcing rib 38 can enhance the strength of the buffer component 30, thereby improving the service life of the buffer component 30.

[0086] In some embodiments, reference Fig.12 and Fig.16 The number of the second reinforcing ribs 38 in each buffer member 30 is two, which are arranged at intervals along the third direction Z. Fig.11 and Fig.14 Along the third direction Z, a channel 32 is defined between the fourth wall surface 354 of the second buffer portion 35 and the adjacent second reinforcing rib 38, referring to Fig.18 The liquid outlet pipe 44 is inserted into the channel 32 defined by the fourth wall surface 354 and the adjacent second reinforcing rib 38 .

[0087] In some embodiments, reference Figure 11-12 as well as Fig.16The first buffer portion 34 also includes a third wall 306, which is arranged at one end of the first buffer portion 34 in the third direction Z close to the second end face 304. The first wall 301 and the second wall 302 are connected by the third wall 306 to form a U-shaped or concave structure of the first buffer portion 34, thereby enhancing the strength of the first buffer portion 34.

[0088] In some embodiments, the first buffer portion 34 and the second buffer portion 35 can absorb the assembly tolerance of the first buffer portion 34 and the second buffer portion 35 along the third direction Z by adding buffer materials such as foam or rubber strips, thereby effectively improving the assembly feasibility between the first buffer portion 34 and the second buffer portion 35.

[0089] In some embodiments, reference Fig.12 and Fig.16 At least three first buffer parts 34 are arranged at intervals along the second direction Y, and two adjacent third walls 306 along the second direction Y are connected to each other, so that at least three first buffer parts 34 are sequentially connected along the second direction Y to form a first buffer component 340. At least three first buffer parts 34 are sequentially connected to form an integrated structure, which improves the processing convenience of the first buffer component 340 and reduces the manufacturing cost. Figure 11 to Figure 13 , Fig.15 as well as Fig.17 At least three second buffer parts 35 are arranged at intervals along the second direction Y, and two adjacent second buffer parts 35 along the second direction Y are sequentially connected through the second connecting part 355 to form a second buffer component 350. At least three second buffer parts 35 are connected through the second connecting part 355 to form an integrated structure, which improves the processing convenience of the second buffer component 350 and reduces the manufacturing cost. Fig.11 and Fig.12 The second buffer component 350 is assembled with the first buffer component 340 along the third direction Z to form the buffer assembly 30a, thereby dividing the buffer assembly 30a into two parts. The first buffer component 340 and the second buffer component 350 can be formed and processed separately, which can reduce the difficulty of the forming process of the buffer assembly 30a, improve the feasibility of later assembly, and reduce the manufacturing cost. The first buffer component 340 and the second buffer component 350 can be connected and fixed by clamping, welding, screwing or gluing.

[0090] In some embodiments, reference Fig.19 The buffer assembly 30a formed by assembling the first buffer component 340 and the second buffer component 350 abuts against the first side wall 121 at one end in the second direction Y, and abuts against the second side wall 122 at the other end in the second direction Y. When the side wall 12 of the box body 10 is impacted by an external force along the second direction Y, the buffer assembly 30a can buffer and absorb the impact force in the second direction Y, thereby protecting the box body 10 and improving the service life of the box body 10.

[0091] In some embodiments, reference Figure 11-12 as well as Fig.16 The first receiving groove 311 includes a first bottom wall 3112, the first bottom wall 3112 is arranged opposite to the adjacent side surface 21 of the battery cell 20 in the first direction X, and the first bottom wall 3112 is arranged opposite to the second wall 302 along the first direction X. Figure 11-12 as well as Figure 15-16 The first bottom wall 3112 has a first through hole 3113 at one end thereof close to the first end surface 303 in the third direction Z. Fig.11 The first through hole 3113 exposes a portion of the first wall 351 of the second buffer portion 35. Along the first direction X, the first wall 301 abuts against the side surface 21 of the adjacent battery cell 20, and a first glue filling cavity 3111 for filling glue is defined between the first receiving groove 311 and the adjacent side surface 21. Fig.18 and Fig.19 A third glue potting cavity 3511 is defined between the first wall surface 351 exposed to the first through hole 3113 and the adjacent side surface 21. Potting glue, foam glue or structural glue can be injected into the third glue potting cavity 3511 and the first glue potting cavity 3111 to connect the battery cell 20 and the buffer component 30, thereby improving the connection stability and firmness between the battery cell 20 and the buffer component 30, and accurately controlling the glue potting area and the glue potting amount, thereby reducing material costs and assembly processes.

[0092] In some embodiments, reference Figure 12-13 and Fig.16 The second receiving groove 321 includes a second bottom wall 3212, and the second bottom wall 3212 is arranged opposite to the first wall 301 along the first direction X. Figure 11-12 as well as Figure 15-16 The second bottom wall 3212 has a second through hole 3213 at one end thereof close to the first end surface 303 in the third direction Z. Fig.11 and Fig.13 The second through hole 3213 exposes a portion of the second wall surface 352 of the second buffer portion 35. Along the first direction X, the second wall 302 abuts against the adjacent side wall 11 of the box body 10, and a second glue filling cavity 3211 for filling glue is defined between the second receiving groove 321 and the adjacent side wall 11. Fig.19 A fourth glue potting cavity 3521 is defined between the second wall surface 352 exposed to the second through hole 3213 and the adjacent side wall 11. Potting glue, foam glue or structural glue can be injected into the fourth glue potting cavity 3521 and the second glue potting cavity 3211 to connect the side wall 11 of the box body 10 with the adjacent buffer component 30, thereby improving the connection stability and firmness between the box body 10 and the buffer component 30, and accurately controlling the glue potting area and glue potting amount, thereby reducing material costs and assembly processes.

[0093] In some embodiments, reference Figure 1 and Figure 2 The battery pack 1 further includes a bottom plate 50, which is disposed on the first end wall 13 of the box body 10 and covers the first opening 131 to form a seal for the first opening 131. Figure 2 A plurality of receiving members 51 are provided on one side of the bottom plate 50 facing the second end wall 14 in the third direction Z. The receiving members 51 extend along the second direction Y. The plurality of receiving members 51 are spaced apart along the first direction X. The second side 23 of the battery cell 20 overlaps and abuts against the receiving members 51 along the third direction Z. The receiving members 51 support and fix the battery cell 20, thereby improving the stability of the battery cell 20 in the third direction Z.

[0094] In some embodiments, reference Figure 1 and Figure 2 The battery pack 1 further includes a cover plate 60 , which is disposed on the second end wall 14 of the box body 10 and covers the second opening 141 to form a seal for the second opening 141 .

[0095] The technical solutions provided by the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the present invention are explained in detail using specific examples. 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 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 pack, the battery pack having a first direction (X) and a third direction (Z) intersecting each other, characterized in that: The battery pack comprises: A box body (10) is provided with a receiving cavity (101) therein, and the box body (10) has a side wall (11); A battery cell (20) is arranged in the accommodating cavity (101), the battery cell (20) having a side surface (21), the side surface (21) and the side wall (11) being arranged opposite to each other along the first direction (X); A buffer (30), the buffer (30) being arranged between the adjacent side surface (21) and the side wall (11) in the first direction (X), the buffer (30) comprising a first wall (301) and a second wall (302) arranged opposite to each other along the first direction (X), and a first end surface (303) and a second end surface (304) arranged opposite to each other along the third direction (Z); a first receiving groove (311) is provided on a surface of the first wall (301) facing away from the second wall (302), an end of the first receiving groove (311) close to the first end surface (303) in the third direction (Z) passes through the first end surface (303) along the third direction (Z), the first wall (301) abuts against the adjacent side surface (21) to define a first glue pouring cavity (3111) for pouring glue in the first receiving groove (311); the second wall (302) abuts against the adjacent side wall (11); A buffer cavity (300) is defined between the first wall (301) and the second wall (302), and the buffer cavity (300) extends along the third direction (Z). After being squeezed, one of the first wall (301) and the second wall (302) can be deformed and move closer to the other along the first direction (X) to achieve buffering.

2. The battery pack according to claim 1, characterized in that: A second receiving groove (321) is provided on a side of the second wall (302) facing away from the first wall (301); the second receiving groove (321) passes through the first end face (303) along the third direction (Z) at one end thereof close to the first end face (303); the second wall (302) abuts against the adjacent side wall (11) to define a second glue pouring cavity (3211) for pouring glue in the second receiving groove (321).

3. The battery pack according to claim 1, wherein: The battery pack further has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The battery pack further comprises at least two heat-conducting plates (40), the heat-conducting plates (40) extending along the first direction (X), the at least two heat-conducting plates (40) being arranged at intervals along the second direction (Y), a receiving cavity (401) being defined between the at least two heat-conducting plates (40), and at least one battery cell (20) being arranged in the receiving cavity (401); The number of the buffer members (30) is at least three, and the at least three buffer members (30) are arranged at intervals along the second direction (Y), and there is a gap (31) between two adjacent buffer members (30) along the second direction (Y); The heat conducting plate (40) comprises a first connecting end (41) and a second connecting end (42) which are arranged opposite to each other along the first direction (X); the first connecting end (41) and the second connecting end (42) are respectively inserted into the adjacent gaps (31) in the first direction (X).

4. The battery pack according to claim 3, characterized in that: The battery pack further comprises a liquid inlet pipe (43) and a liquid outlet pipe (44), the first connection end (41) is connected via the liquid inlet pipe (43), and the second connection end (42) is connected via the liquid outlet pipe (44); The buffer cavities (300) in at least three of the buffer members (30) are connected along the second direction (Y) to form a channel (32); the liquid inlet pipe (43) is arranged in the channel (32) where the first connecting end (41) is located, and / or the liquid outlet pipe (44) is arranged in the channel (32) where the second connecting end (42) is located.

5. The battery pack according to claim 1, wherein: The buffer member (30) comprises a partition plate (33) and a first reinforcing rib (331), and the partition plate (33) is arranged in the buffer cavity (300); One end of the partition (33) in the first direction (X) abuts against the first wall (301), and the other end of the partition (33) in the first direction (X) abuts against the second wall (302), so as to separate the buffer cavity (300) into a first cavity (310) and a second cavity (320) which are arranged at intervals along the third direction (Z); The first reinforcing rib (331) is arranged in the second chamber (320), the first wall (301) is connected to the partition (33) through the first reinforcing rib (331), and the second wall (302) is connected to the partition (33) through the first reinforcing rib (331).

6. The battery pack according to claim 3, characterized in that: The buffer member (30) comprises a first buffer portion (34) and a second buffer portion (35); The first buffer portion (34) comprises the first wall (301) and the second wall (302), and the buffer cavity (300) is defined between the first wall (301) and the second wall (302); The first buffer portion (34) further comprises a first end surface (303) and a second end surface (304) arranged opposite to each other along the third direction (Z); the second buffer portion (35) is arranged inside the buffer cavity (300) at one end close to the first end surface (303) in the third direction (Z); The second buffer portion (35) comprises a first wall surface (351) and a second wall surface (352) which are arranged opposite to each other along the first direction (X); the first wall surface (351) abuts against the first wall (301), and the second wall surface (352) abuts against the second wall (302).

7. The battery pack according to claim 6, characterized in that: Among the at least three buffer members (30), a first gap (36) exists between two of the first buffer portions (34) adjacent to each other along the second direction (Y), a second gap (37) exists between two of the second buffer portions (35) adjacent to each other along the second direction (Y), and the first gap (36) and the second gap (37) are connected along the third direction (Z) to form the gap (31); The first connection end (41) and the second connection end (42) are respectively inserted into the first gaps (36) adjacent to each other in the first direction (X).

8. The battery pack according to claim 6, wherein: Support portions (305) are respectively protruded on the opposite surfaces of the first wall (301) and the second wall (302), and the two support portions (305) are arranged opposite to each other along the first direction (X); The second buffer portion (35) comprises a third wall surface (353) and a fourth wall surface (354) which are arranged opposite to each other along the third direction (Z); the fourth wall surface (354) and the two support portions (305) are overlapped along the third direction (Z); the two support portions (305) cooperate to form support for the second buffer portion (35) in the buffer cavity (300).

9. The battery pack according to claim 6, characterized in that: A third through hole (3541) is provided on the second buffer portion (35), the third through hole (3541) penetrates the second buffer portion (35) along the third direction (Z), and the third through hole (3541) is in communication with the buffer cavity (300); The first buffer portion (34) further includes a second reinforcing rib (38), wherein the second reinforcing rib (38) is arranged on the inner side of the buffer cavity (300) at one end close to the second end surface (304) in the third direction (Z), and the first wall (301) and the second wall (302) are connected via the second reinforcing rib (38).

10. The battery pack according to claim 3, characterized in that: At least three of the buffer members (30) are connected to each other at one end close to the first end surface (303) in the third direction (Z) to form a buffer assembly (30a); The box body (10) comprises two side walls (12) arranged opposite to each other along the second direction (Y), and opposite ends of the buffer component (30a) in the second direction (Y) respectively abut against adjacent side walls (12).

11. The battery pack according to claim 1, wherein: The battery pack further has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The number of the buffer members (30) is at least three, and the at least three buffer members (30) are arranged at intervals along the second direction (Y); The first wall (301) has two side edges (3011) arranged opposite to each other along the second direction (Y), and two adjacent side edges (3011) of the first walls (301) adjacent to each other in the second direction (Y) are respectively provided with a clamping portion (3012), and the clamping portion (3012) is arranged at one end of the side edge (3011) close to the second end surface (304) in the third direction (Z); The clamping portion (3012) is protrudingly arranged on the side edge (3011) along the second direction (Y), and the clamping portions (3012) on two adjacent side edges (3011) along the second direction (Y) are arranged opposite to each other.

12. An electrical device, characterized in that: The invention comprises a battery pack as claimed in any one of claims 1 to 11.

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