Battery packs and electrical devices

Abstract

The embodiment of the present application provides a battery pack and an electric device. The battery pack includes a housing, a heat sink, a battery cell assembly, a buffer and a first heat conductive member. The heat sink is arranged in the housing; the battery cell assembly is arranged inside the housing, and the battery cell assembly includes a battery cell; the buffer is located between the heat sink and the battery cell assembly; the first heat conductive member includes a first heat conductive portion and a first connecting portion; the first heat conductive portion is located between adjacent battery cells, and the first heat conductive portion is connected to at least one of the battery cells; the first connecting portion is located between the heat sink and the buffer, the first connecting portion is connected to the heat sink, and the first connecting portion is connected to the buffer.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery pack and an electrical device. Background Art

[0002] The battery pack mainly includes a shell and a battery cell assembly arranged inside the shell. During the charging and discharging process, the battery cell assembly generates heat, which is transferred to the shell for heat dissipation.

[0003] However, the heat generated in the middle of the battery cell assembly is not easily transferred to the outer casing, resulting in heat accumulation in the middle of the battery cell assembly, affecting the safety of the battery pack. Summary of the invention

[0004] The embodiments of the present invention provide a battery pack and an electric device, which can effectively improve the safety of the battery pack.

[0005] In a first aspect, an embodiment of the present invention provides a battery pack, including a housing, a heat sink, a battery cell assembly, a buffer, and a first heat conductive member. The heat sink is disposed in the housing; the battery cell assembly is disposed inside the housing, and the battery cell assembly includes a battery cell; the buffer is located between the heat sink and the battery cell assembly; the first heat conductive member includes a first heat conductive portion and a first connecting portion; the first heat conductive portion is located between adjacent battery cells, and the first heat conductive portion is connected to at least one of the battery cells; the first connecting portion is located between the heat sink and the buffer, the first connecting portion is connected to the heat sink, and the first connecting portion is connected to the buffer.

[0006] In the above embodiment, the heat sink and the battery cell assembly are arranged along the first direction; the first heat conductor includes a first extension portion, the first extension portion is located on one side of the battery cell assembly along the second direction, and the first extension portion is separated from or in direct contact with each battery cell; the first direction is perpendicular to the second direction.

[0007] In one or more of the above optional embodiments, each battery cell includes an electrode terminal, and the electrode terminal is located on one side of the battery cell along the third direction; the first direction is perpendicular to the second direction and the third direction.

[0008] In one or more optional embodiments above, the battery pack includes a second heat-conducting member; the second heat-conducting member includes a second heat-conducting portion, a second extending portion and a second connecting portion, the second extending portion is located on one side of the battery cell assembly along the second direction, and the second extending portion is separated from or in direct contact with each battery cell; the second heat-conducting portion is located between other adjacent battery cells, and the second heat-conducting portion is connected to at least one of the two adjacent battery cells; the second connecting portion is located between the heat sink and the buffer, the second connecting portion is connected to the heat sink, and the second connecting portion is connected to the buffer.

[0009] In one or more of the above optional embodiments, the first connection portion is bonded to the buffer component, and / or the second connection portion is bonded to the buffer component.

[0010] In one or more optional embodiments above, along the second direction, the first extension portion and the second extension portion are respectively located on two sides of the battery cell assembly.

[0011] In one or more optional embodiments above, the battery pack includes a third heat-conducting member; the third heat-conducting member includes a third heat-conducting portion, a third extension portion and a third connecting portion, the third extension portion is located on one side of the battery cell assembly along the second direction, and the third extension portion is separated from or in direct contact with each battery cell; the third heat-conducting portion is located between other adjacent battery cells, and the third heat-conducting portion is connected to at least one of the two adjacent battery cells; the third connecting portion is located between the heat sink and the second connecting portion, and the third connecting portion is connected to the second connecting portion; wherein the first heat-conducting portion, the second heat-conducting portion, the third heat-conducting portion and different battery cells are connected.

[0012] In one or more optional embodiments above, the third extension portion and the second extension portion are located on the same side of the battery cell assembly, and the first extension portion is located on the other side of the battery cell assembly along the second direction; along the first direction, the first heat conducting portion is located between the second heat conducting portion and the third heat conducting portion.

[0013] In one or more optional embodiments above, the second connection part and the third connection part are stacked along the first direction, and along the first direction, the projection of the first connection part and the projection of the second connection part are separated, and the projection of the first connection part and the projection of the third connection part are separated.

[0014] In one or more of the above optional embodiments, the battery cell assembly includes a first battery cell, a second battery cell, a third battery cell, a fourth battery cell and a fifth battery cell arranged in sequence along a first direction, and the first battery cell and the fifth battery cell are the outermost batteries of the battery cell assembly; the first heat conducting part is located between the third battery cell and the fourth battery cell, and the first heat conducting part is connected to the third battery cell and the fourth battery cell respectively; the second heat conducting part is located between the first battery cell and the second battery cell, and the second heat conducting part is connected to the first battery cell and the second battery cell respectively; the third heat conducting part is located between the fourth battery cell and the fifth battery cell, and the third heat conducting part is connected to the fifth battery cell; the third heat conducting part and the fourth battery cell are physically separated, or a heat insulating part is provided between the third heat conducting part and the fourth battery cell, and the thermal conductivity of the heat insulating part at 25°C is less than 0.05W / (m·K).

[0015] In one or more optional embodiments above, the battery pack includes an elastic member disposed between adjacent battery cells, the elastic member being configured to provide expansion space for the battery cells; along the first direction, a projection of the first connecting portion and a projection of the elastic member are separated.

[0016] In one or more of the above optional embodiments, the battery pack includes a first elastic member, the first elastic member is disposed between the second battery cell and the third battery cell, and the first elastic member is configured to provide expansion space for the second battery cell and the third battery cell; and / or, the battery pack includes a second elastic member, the second elastic member is disposed between the fourth battery cell and the fifth battery cell, and the second elastic member is configured to provide expansion space for the fourth battery cell and the fifth battery cell; the buffer member is configured to provide expansion space for the first battery cell.

[0017] In one or more optional embodiments above, the first heat conductor includes a first bending portion, the first bending portion connects the first connecting portion and the first extension portion, and a gap is formed between the first bending portion and the battery cell assembly; and / or, the second heat conductor includes a second bending portion, the second bending portion connects the second connecting portion and the second extension portion, and a gap is formed between the second bending portion and the battery cell assembly; and / or, the third heat conductor includes a third bending portion, the third bending portion connects the third connecting portion and the third extension portion, and a gap is formed between the third bending portion and the battery cell assembly.

[0018] In one or more optional embodiments above, the first heat conductor, the second heat conductor and the third heat conductor are all graphite heat conductors; the first heat conductor, the second heat conductor and the third heat conductor all include graphite layers, and the two side surfaces of the graphite layer along the first direction are respectively covered with insulating layers, and the insulating layers are bonded and fixed to the graphite layers.

[0019] In one or more optional embodiments above, the in-plane thermal conductivity of the graphite layer at 25° C. is greater than or equal to 800 w / (mk) and less than or equal to 2000 w / (mk).

[0020] In one or more optional embodiments above, the battery cell assembly includes a fixing member, which surrounds the battery cell assembly along the first direction and the second direction, and fixes the multiple battery cells; along the first direction, the projection of the fixing member and the projection of the first heat conductor are separated.

[0021] In one or more optional embodiments above, the battery pack includes an elastic member disposed between adjacent battery cells, the elastic member being configured to provide expansion space for the battery cells; along the first direction, a projection of the fixing member and a projection of the elastic member at least partially overlap.

[0022] In one or more of the above optional embodiments, the shell includes a top wall with an opening, and the heat sink is arranged in the opening; the heat sink surface facing the battery cell assembly is flush with the inner surface of the top wall, or the heat sink surface facing the battery cell assembly protrudes from the inner surface of the shell.

[0023] In one or more of the above optional embodiments, the first connecting portion is in direct contact with the heat sink.

[0024] In one or more of the above optional embodiments, the buffer component and the top wall are bonded.

[0025] In one or more of the above optional embodiments, the connection is by direct contact or adhesive connection.

[0026] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery pack as described in the first aspect, wherein the battery pack is used to provide electrical energy.

[0027] The battery pack and electrical device provided in the embodiments of the present application are provided with a first heat conducting member so that the first connecting portion of the first heat conducting member is connected to the heat sink. The first heat conducting portion of the first heat conducting member is provided between two adjacent battery cells. During the charging and discharging process of each battery cell, the heat generated by the battery cell can be transferred to the heat sink of the shell and dissipated through the heat sink, thereby effectively reducing the accumulation of heat in the middle position of the battery cell assembly and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings.

[0029] Figure 1 A schematic diagram of the structure of a battery pack provided in some embodiments of the present application;

[0030] Figure 2 An exploded view of a battery pack provided for some embodiments of the present application;

[0031] Figure 3 A schematic diagram of the structure of each heat-conducting member on a cell assembly of a battery pack provided in some embodiments of the present application;

[0032] Figure 4 A schematic diagram of the structure of a cell assembly of a battery pack provided in some embodiments of the present application;

[0033] Figure 5 Another structural schematic diagram of each heat-conducting member on a cell assembly of a battery pack provided in some embodiments of the present application being unfolded;

[0034] Figure 6 Another schematic diagram of the structure of a cell assembly of a battery pack provided in some embodiments of the present application;

[0035] Figure 7 An exploded view of a cell assembly of a battery pack provided in some embodiments of the present application;

[0036] Figure 8 A schematic structural diagram of a first heat-conducting member of a battery pack provided in some embodiments of the present application;

[0037] Fig. 9Another schematic diagram of the structure of the first heat conducting member of the battery pack provided in some embodiments of the present application;

[0038] Fig.10 A schematic diagram of the structure of a second heat conducting member of a battery pack provided in some embodiments of the present application;

[0039] Fig.11 Another schematic diagram of the structure of the second heat conducting member of the battery pack provided in some embodiments of the present application;

[0040] Fig.12 Another structural schematic diagram of the second heat conducting member of the battery pack provided in some embodiments of the present application;

[0041] Fig.13 A schematic structural diagram of a third heat-conducting member of a battery pack provided in some embodiments of the present application;

[0042] Fig.14 Another schematic structural diagram of the third heat conducting member of the battery pack provided in some embodiments of the present application;

[0043] Fig.15 A schematic structural diagram of a first heat-conducting member of a battery pack provided in some embodiments of the present application;

[0044] Fig.16 for Fig.15 A partial enlarged view of

[0045] Fig.17 A schematic diagram of a structure in which a second heat-conducting member of a battery pack is unfolded according to some embodiments of the present application;

[0046] Fig.18 for Fig.17 A partial enlarged view of

[0047] Fig.19 A schematic diagram of a structure in which a second heat-conducting member of a battery pack is unfolded according to some embodiments of the present application;

[0048] Fig. 20 for Fig.19 A partial enlarged view of

[0049] Fig.21 A schematic diagram of a structure of a battery pack provided in some embodiments of the present application having a first heat conducting member;

[0050] Fig. 22 A schematic diagram of a structure of a battery pack provided in some embodiments of the present application having a second heat conducting member;

[0051] Fig.23 A schematic structural diagram of a battery pack provided in some embodiments of the present application having a third heat conducting member.

[0052] Description of Figure Numbers:

[0053] 1. Shell; 11. First shell; 111. Top wall; 1111. Opening; 112. First side wall; 12. Second shell; 121. Bottom wall; 122. Second side wall;

[0054] M. Radiator;

[0055] 2. Cell assembly; 21. Cell; 21a. Electrode terminal; 211. First cell; 212. Second cell; 213. Third cell; 214. Fourth cell; 215. Fifth cell;

[0056] 31, first heat conducting member; 31a, first heat conducting portion; 31b, first connecting portion; 31c, first extending portion; 31d, first bending portion; 31e, graphite layer; 31f, insulating layer; 31g, bonding layer; 311, second bonding member; 312, third bonding member; 313, fourth bonding member;

[0057] 32, second heat conducting member; 32a, second heat conducting portion; 32b, second connecting portion; 32c, second extending portion; 32d, second bending portion; 32e, graphite layer; 32f, insulating layer; 32g, bonding layer; 321, fifth bonding member; 322, sixth bonding member; 323, seventh bonding member;

[0058] 33, third heat conducting member; 33a, third heat conducting portion; 33b, third connecting portion; 33c, third extending portion; 33d, third bending portion; 33e, graphite layer; 33f, insulating layer; 33g, bonding layer; 331, eighth bonding member; 332, ninth bonding member;

[0059] 4. Buffer member; 4a. First adhesive member;

[0060] 5. elastic member; 5a. first elastic member; 5b. second elastic member;

[0061] 6. Fixing parts;

[0062] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0063] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention, rather than to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0065] The battery pack and the electrical device of the present application are described below with reference to the accompanying drawings.

[0066] It should be noted that the words first direction X, second direction Y and third direction in the embodiments of the present application are only used to more clearly illustrate the structure of the present application in conjunction with the drawings, and the present application is not limited thereto. The first direction X, the second direction Y and the third direction have an angle between each other. Optionally, the first direction X, the second direction Y and the third direction are perpendicular to each other.

[0067] like Figures 1 to 9 As shown, an embodiment of the present application provides a battery pack, including a shell 1 and a battery cell assembly 2 located in the shell 1, the battery cell assembly 2 includes a plurality of battery cells, and electrical energy is provided by the battery cells 21.

[0068] In some embodiments, the plurality of battery cells 21 are arranged along the first direction X.

[0069] In some embodiments, the battery pack includes a heat sink M, which is used to transfer heat inside the shell 1 to the outside of the shell 1 to cool the battery cell assembly 2.

[0070] In some embodiments, the heat sink M and the battery cell assembly 2 are arranged along the first direction X.

[0071] In some embodiments, the battery pack includes a buffer member 4 , which is located between the heat sink 13 and the battery cell assembly 2 , and is used to provide buffer protection for the battery cell assembly 2 and reduce the rigid contact between the battery cell assembly 2 and the heat sink 13 .

[0072] In some embodiments, the battery pack includes a first heat-conducting member 31, which includes a first heat-conducting portion 31a and a first connecting portion 31b. The first heat-conducting portion 31a is located between adjacent battery cells 21, and the first heat-conducting portion 31a is connected to at least one of the battery cells 21, and the heat generated during the charging and discharging process of the battery cell 21 is absorbed by the first heat-conducting portion 31a. The first connecting portion 31b is located between the heat sink M and the buffer 4, and the first connecting portion 31b is connected to the heat sink M, and the first connecting portion 31b is connected to the buffer 4; the heat absorbed by the first heat-conducting portion 31a is transferred to the heat sink M through the first connecting portion 31b, and the heat is dissipated by the heat sink M, so as to achieve the effect of cooling and lowering the temperature.

[0073] The battery pack provided in the embodiment of the present application is provided with a first heat conducting member 31, so that the first connecting portion 31b of the first heat conducting member 31 is connected to the heat sink 13, and the first heat conducting portion 31a of the first heat conducting member 31 is provided between two adjacent battery cells 21. During the charging and discharging process of the battery cells 21, the heat generated by the battery cells 21 is transferred to the heat sink 13 of the shell 1, and the heat is dissipated through the heat sink 13, thereby improving the safety of the battery pack.

[0074] In some embodiments, the first connection portion 31 b and the buffer member 4 are bonded to maintain the position of the first connection portion 31 b so that the first connection portion 31 b is reliably connected to the heat sink 13 .

[0075] In some embodiments, the connection method includes direct contact between the two components, or bonding, such as bonding by double-sided tape.

[0076] In some embodiments, the housing 1 includes a first shell 11 and a second shell 12 , the first shell 11 and the second shell 12 are connected and enclosed to form a closed cavity, and the battery cell assembly 2 is disposed inside the cavity.

[0077] In some embodiments, the first shell 11 includes a top wall 111 and a first side wall 112 connected to the periphery of the top wall 111, the second shell 12 includes a bottom wall 121 and a second side wall 122 connected to the periphery of the bottom wall 121, the top wall 111 and the bottom wall 121 are arranged opposite to each other along the first direction X, and the first side wall 112 and the second side wall 122 are both roughly annular structures.

[0078] Optionally, the first side wall 112 is integrally connected to the top wall 111 to improve the structural strength and sealing of the first shell 11 ; the second side wall 122 is integrally connected to the bottom wall 121 to improve the structural strength of the second shell 12 .

[0079] In some embodiments, an opening 1111 is provided on the top wall 111 , and the heat sink 13 is disposed at the opening 1111 .

[0080] In some embodiments, the heat sink 13 is integrally formed and connected to the top wall 111 .

[0081] In some embodiments, the surface of the heat sink 13 facing the battery cell assembly 2 is flush with the inner surface of the top wall 111, or the surface of the heat sink 13 facing the battery cell assembly 2 protrudes from the inner surface of the housing 1.

[0082] In some embodiments, the first connection portion 31 b directly contacts or abuts against the heat sink 13 , thereby improving the heat conduction efficiency of the first heat conducting member 31 .

[0083] In some embodiments, the buffer member 4 is bonded to the top wall 111, thereby bonding the battery cell assembly 2, the housing 1, and the first heat-conducting member 31 to fix the relative positions of the battery cell assembly 2, the housing 1, and the first heat-conducting member 31. Optionally, the buffer member 4 is bonded to the top wall 111 by a first adhesive member 4a.

[0084] In some embodiments, Figure 8 and Fig. 9 As shown, the first heat-conducting member 31 includes a first extension portion 31c, and the first extension portion 31c connects the first heat-conducting portion 31a and the first connecting portion 31b. The first extension portion 31c is used to achieve heat conduction between the first heat-conducting portion 31a and the first connecting portion 31b. The first extension portion 31c is located on one side of the battery cell assembly 2 along the second direction Y, and the first extension portion 31c is separated from or in direct contact with each battery cell 21; the first extension portion 31c is not fixed to the battery cell assembly 2, and when the battery cell assembly 2 expands and changes in size along the first direction X, the pulling force on the first extension portion 31c is reduced, thereby providing protection for the first extension portion 31c.

[0085] In some embodiments, the first heat conducting portion 31a, the first extension portion 31c and the first connecting portion 31b are integrally formed and connected to form a complete sheet structure, and the first heat conducting portion 31a, the first extension portion 31c and the first connecting portion 31b are all formed by bending the first heat conducting member 31.

[0086] In some embodiments, the first heat conductor 31 includes a first bent portion 31d, and the first bent portion 31d connects the first connecting portion 31b and the first extension portion 31c. A gap is formed between the first bent portion 31d and the battery cell assembly 2, and the first bent portion 31d and the battery cell assembly 2 are not fixed. By providing the first bent portion 31d to provide redundancy for the first extension portion 31c, when the battery cell 21 expands, the size of the battery cell assembly 2 along the first direction X increases, and the first bent portion 31d and the first connecting portion 31b are stretched along the first direction X, which can reduce the situation where the first connecting portion 31b is pulled and broken along the first direction X.

[0087] In some embodiments, Figure 7As shown, each battery cell 21 includes an electrode terminal 21a, through which the electrical connection of the battery cell 21 is realized. The electrode terminal 21a is located on one side of the battery cell 21 along the third direction, and the heat conductive member 3 and the electrode terminal 21a are arranged in different directions of the battery cell 21, so as to reduce the interference between the electrode terminal 21a and the heat conductive member 3, and facilitate the bending of the first heat conductive member 31.

[0088] In some embodiments, Figure 11 to Figure 12 As shown, the battery pack includes a second heat-conducting member 32, which includes a second heat-conducting portion 32a, a second extending portion 32c and a second connecting portion 32b. The second extending portion 32c connects the second heat-conducting portion 32a and the second connecting portion 32b. The second extending portion 32c is used to realize heat conduction between the second heat-conducting portion 32a and the second connecting portion 32b.

[0089] In some embodiments, the second extension portion 32c is located on one side of the battery cell assembly 2 along the second direction Y, and the second extension portion 32c is separated from or in direct contact with each battery cell 21; the second extension portion 32c is not fixed to the battery cell assembly 2, and when the battery cell assembly 2 expands and changes in size along the first direction X, the pulling force on the second extension portion 32c is reduced, thereby providing protection for the second extension portion 32c.

[0090] In some embodiments, the second heat conducting portion 32a is located between other adjacent battery cells 21, and the second heat conducting portion 32a is connected to at least one of the two adjacent battery cells 21, and the heat generated during the charging and discharging process of the battery cell 21 is absorbed by the second heat conducting portion 32a. The second heat conducting portion 32a and the first heat conducting portion 31a are respectively located between two different adjacent battery cells 21, and the heat between different battery cells 21 is conducted out, thereby improving the cooling effect of the battery cell assembly 2. For example, the second heat conducting portion 32a is in direct contact with the battery cell 21, or the second heat conducting portion 32a is bonded to the battery cell 21.

[0091] In some embodiments, the second heat conducting portion 32 a is connected to each of the two adjacent battery cells 21 to dissipate heat from the two battery cells 21 .

[0092] In some embodiments, the second connection portion 32b is located between the radiator 13 and the buffer 4, the second connection portion 32b is connected to the radiator 13, the second heat conducting portion 32a is connected to the buffer 4, and the heat absorbed by the second heat conducting portion 32a is transferred to the radiator 13 through the second connection portion 32b, and the heat is dissipated through the radiator 13, thereby achieving a cooling effect.

[0093] In some embodiments, the second heat conducting portion 32a, the second extension portion 32c and the second connecting portion 32b are integrally formed and connected to form a complete sheet structure, and the second heat conducting portion 32a, the second extension portion 32c and the second connecting portion 32b are all formed by bending the second heat conducting member 32.

[0094] In some embodiments, the second connection portion 32 b and the buffer member 4 are bonded to maintain the position of the second connection portion 32 b so that the second connection portion 32 b is reliably connected to the heat sink 13 .

[0095] In some embodiments, the second heat conductor 32 includes a second bending portion 32d, which connects the second connecting portion 32b and the second extending portion 32c. By setting the second bending portion 32d, redundancy can be provided for the second extending portion 32c. When the battery cell 21 expands, the size of the battery cell assembly 2 along the first direction X increases, and the second bending portion 32d and the second connecting portion 32b are stretched along the first direction X, which can reduce the situation where the second connecting portion 32b is pulled and broken along the first direction X.

[0096] A gap is formed between the second bent portion 32d and the battery cell assembly 2, and the second bent portion 32d is not bonded and fixed to the battery cell assembly 2, which can reduce the situation where the second bent portion 32d is pulled and damaged when the battery cell 21 expands.

[0097] In some embodiments, along the second direction Y, the first extension portion 31c and the second extension portion 32c are respectively located on both sides of the battery cell assembly 2. The heat between different battery cells 21 is conducted and dissipated through different paths, which can improve the heat dissipation efficiency of the battery pack.

[0098] In some embodiments, along the second direction Y, the first extension portion 31c and the second extension portion 32c are located on the same side of the battery cell assembly 2 to facilitate assembly.

[0099] In some embodiments, Fig.13 and Fig.14 As shown, the battery pack includes a third heat conducting member 33, which includes a third heat conducting portion 33a, a third extending portion 33c and a third connecting portion 33b. The third extending portion 33c is used to achieve heat conduction between the third heat conducting portion 33a and the third connecting portion 33b.

[0100] In some embodiments, in some embodiments, the third extension portion 33c is located on one side of the battery cell assembly 2 along the second direction Y, the third extension portion 33c is separated from or in direct contact with each battery cell 21, and the third extension portion 33c is not fixed to the battery cell assembly 2. When the battery cell assembly 2 expands and changes in size along the first direction X, the pulling force on the third extension portion 33c is reduced, thereby providing protection for the third extension portion 33c.

[0101] In some embodiments, the third heat conducting portion 33a, the third extension portion 33c and the third connection portion 33b are integrally formed and connected to form a complete sheet structure, and the third heat conducting portion 33a, the third extension portion 33c and the third connection portion 33b are all formed by bending the third heat conducting member 33.

[0102] In some embodiments, the third heat conducting portion 33a is located between other adjacent battery cells 21, and the third heat conducting portion 33a is connected to at least one of the battery cells 21, and the heat generated during the charging and discharging process of the battery cells 21 is absorbed by the third heat conducting portion 33a.

[0103] In some embodiments, the first heat conducting part 31a, the second heat conducting part 32a, and the third heat conducting part 33a are respectively located between two different adjacent battery cells 21, and the first heat conducting part 31a, the second heat conducting part 32a, and the third heat conducting part 33a are connected to different battery cells 21. The heat generated during the charging and discharging process of the battery cell 21 is conducted out through the first heat conducting part 31, the second heat conducting part 32, or the third heat conducting part 33. The cooling effect of the battery cell assembly 2 is improved.

[0104] In some embodiments, the third connection portion 33b is located between the heat sink 13 and the second connection portion 32b, and the third connection portion 33b and the second connection portion 32b are connected. The heat absorbed by the third heat conducting portion 33a is transferred to the heat sink 13 through the third connection portion 33b, and the heat is dissipated through the heat sink 13 to achieve a cooling effect.

[0105] In some embodiments, the third connection portion 33b and the second connection portion 32b are bonded to maintain the position of the third connection portion 33b, so that the third connection portion 33b is more stably connected to the heat sink 13 through the second connection portion 32b.

[0106] In some embodiments, the third extension portion 33c and the second extension portion 32c are located on the same side of the battery cell assembly 2 along the second direction Y, and the first extension portion 31c is disposed on the other side of the battery cell assembly 2 along the second direction Y. The third extension portion 33c and the second extension portion 32c may be stacked along the second direction Y, and the third extension portion 33c and the second extension portion 32c may contact or be separated from each other.

[0107] In some embodiments, along the first direction X, the first heat conducting portion 31 a is located between the second heat conducting portion 32 a and the third heat conducting portion 33 a .

[0108] In some embodiments, the first heat conducting portion 31a is disposed between the two battery cells 21 located in the middle along the first direction X, the second heat conducting portion 32a is disposed between the two battery cells 21 closest to the top wall 111 along the first direction X, and the third heat conducting portion 33a is disposed between the two battery cells 21 closest to the bottom wall 121 along the first direction X. The temperature of the battery cell assembly 2 located in the middle along the first direction X is the highest, and the heat conduction requirement of the first heat conducting member 31 is higher than the heat conduction requirement of the second heat conducting member 32 and the heat conduction requirement of the third heat conducting member 33. In order to improve the heat conduction capacity of the first heat conducting member 31, the first heat conducting member 31 is disposed independently of the second heat conducting member 32 and the third heat conducting member 33, so that the first heat conducting member 31 forms a separate heat transfer path.

[0109] In some embodiments, the second connection portion 32b and the third connection portion 33b are stacked along the first direction X, and along the first direction X, the projection of the first connection portion 31b and the projection of the second connection portion 32b are separated, and the projection of the first connection portion 31b and the projection of the third connection portion 33b are separated. The first heat-conducting member 31 forms a separate heat transfer path to quickly export the heat of the battery core assembly 2.

[0110] In some embodiments, the third heat conductor 33 includes a third bending portion 33d, which connects the third connecting portion 33b and the third extending portion 33c. By setting the third bending portion 33d, redundancy can be provided for the third extending portion 33c. When the battery cell 21 expands, the size of the battery cell assembly 2 along the first direction X increases, and the third bending portion 33d and the third connecting portion 33b are stretched along the first direction X, which can reduce the situation where the third connecting portion 33b is pulled and broken along the first direction X.

[0111] In some embodiments, a gap is formed between the third bent portion 33d and the battery cell assembly 2, and the third bent portion 33d is not bonded to the battery cell assembly 2, which can reduce the possibility that the third bent portion 33d is pulled and damaged when the battery cell 21 expands.

[0112] In some embodiments, the first heat conducting member 31 , the second heat conducting member 32 , and the third heat conducting member 33 are all graphite heat conducting members, and the structures and heat conducting capacities of the first heat conducting member 31 , the second heat conducting member 32 , and the third heat conducting member 33 are substantially the same.

[0113] like Fig.15 and Fig.16As shown, the first heat conductor 31 includes a first graphite layer 31e, which is the main component for the first heat conductor 31 to achieve heat conduction. The two side surfaces of the first graphite layer 31e are respectively covered with a first insulating layer 31f, which reduces the risk of the first graphite layer 31e conducting the circuit between the battery cells 21 and affecting the circuit safety of the battery cell assembly 2. Optionally, the first insulating layer 31f and the first graphite layer 31e are bonded and fixed by a first adhesive layer 31g to improve the connection reliability between the first insulating layer 31f and the first graphite layer 31e.

[0114] like Fig.17 and Fig.18 As shown, the second heat conductor 32 includes a second graphite layer 32e, which is the main component for the second heat conductor 32 to achieve heat conduction. The second insulating layer 32f is respectively covered on both sides of the second graphite layer 32e to reduce the risk of the second graphite layer 32e conducting the circuit between the battery cells 21 and affecting the circuit safety of the battery cell assembly 2. Optionally, the second insulating layer 32f and the second graphite layer 32e are bonded and fixed by a second adhesive layer 32g to improve the connection reliability between the second insulating layer 32f and the second graphite layer 32e.

[0115] like Fig.19 and Fig. 20 As shown, the third heat conductor 33 includes a third graphite layer 33e, which is the main component for the third heat conductor 33 to achieve heat conduction. The two side surfaces of the third graphite layer 33e are respectively covered with a third insulating layer 33f, which reduces the risk of the third graphite layer 33e affecting the circuit safety of the battery cell assembly 2 due to the circuit conduction between the battery cells 21. Optionally, the third insulating layer 33f and the third graphite layer 33e are bonded and fixed by a third adhesive layer 33g to improve the connection reliability between the third insulating layer 33f and the third graphite layer 33e.

[0116] In some embodiments, the first heat conducting portion 31a is bonded to at least one of the adjacent battery cells 21, which is beneficial to fix the position of the first heat conducting portion 31a, reduce the movement of the first heat conducting portion 31a, and cause the first graphite layer 31e to move, thereby reducing the thermal conductivity efficiency of the first heat conducting member 31.

[0117] In some embodiments, the first heat conducting part 31a is bonded to two of the adjacent battery cells 21. The first heat conducting member 31 is provided with a second adhesive member 311 and a third adhesive member 312, the second adhesive member 311 bonds the first heat conducting part 31a to one of the battery cells 21, and the third adhesive member 312 bonds the first heat conducting part 31a to another of the battery cells 21.

[0118] In some embodiments, see Figure 5The first heat conducting member 31 is provided with a fourth adhesive member 313 , and the fourth adhesive member 313 bonds the first connecting portion 31 b to the buffer member 4 .

[0119] In some embodiments, the second heat conducting portion 32a is bonded to at least one of the adjacent battery cells 21, which is beneficial to fix the position of the second heat conducting portion 32a, reduce the movement of the second heat conducting portion 32a, and cause the second graphite layer 32e to move, thereby reducing the thermal conductivity efficiency of the second heat conducting member 32.

[0120] In some embodiments, the second heat conducting portion 32a is bonded to two of the adjacent battery cells 21. The second heat conducting member 32 is provided with a fifth adhesive member 321 and a sixth adhesive member 322, the fifth adhesive member 321 bonds the second heat conducting portion 32a to one of the battery cells 21, and the sixth adhesive member 322 bonds the second heat conducting portion 32a to another of the battery cells 21.

[0121] In some embodiments, the second heat conducting member 32 is provided with a seventh adhesive member 323 , and the seventh adhesive member 323 bonds the second connecting portion 32 b to the buffer member 4 .

[0122] In some embodiments, the third heat conducting portion 33a is bonded to at least one of the adjacent battery cells 21, which is beneficial to fixing the position of the third heat conducting portion 33a and reducing the movement of the third heat conducting portion 33a so that the third graphite layer 33e moves and reduces the thermal conductivity efficiency of the third heat conducting member 33.

[0123] In some embodiments, the third heat conducting portion 33a is bonded to one of two battery cells 21 in the adjacent battery cells 21. The third heat conducting member 33 is provided with an eighth adhesive member 331, and the eighth adhesive member 331 bonds the third heat conducting portion 33a to one of the battery cells 21.

[0124] In some embodiments, see Figure 3 The second heat conducting member 32 is provided with a ninth adhesive member 332 , and the ninth adhesive member 332 bonds the second connecting portion 32 b to the buffer member 4 .

[0125] In some embodiments, the first heat conducting member 31 is a graphite heat conducting member, see Figure 8 , Figure 8 The arrow in the figure refers to the heat conduction path of the first heat conductor 31 in the plane. The plane thermal conductivity of the first heat conductor 31 is greater than or equal to 800w / (mk) and less than or equal to 2000w / (mk), so that the first heat conductor 31 has good thermal conductivity, wherein the plane thermal conductivity refers to the thermal conductivity at 25°C.

[0126] In some embodiments, the second heat conducting member 32 is a graphite heat conducting member, see Fig.10 , Fig.10The arrow in the figure refers to the planar heat conduction path of the second heat conductor 32. The planar thermal conductivity of the second heat conductor 32 is greater than or equal to 800w / (mk) and less than or equal to 2000w / (mk), so that the second heat conductor 32 has good thermal conductivity, wherein the planar thermal conductivity refers to the thermal conductivity at 25°C.

[0127] In some embodiments, the third heat conducting member 33 is a graphite heat conducting member, see Fig.13 , Fig.13 The arrow in the figure refers to the planar heat conduction path of the third heat conductor 33. The planar thermal conductivity of the third heat conductor 33 is greater than or equal to 800w / (mk) and less than or equal to 2000w / (mk), so that the third heat conductor 33 has good thermal conductivity, wherein the planar thermal conductivity refers to the thermal conductivity at 25°C.

[0128] In some embodiments, Figures 3 to 7 As shown, the battery cell assembly 2 includes five battery cells 21. The battery cell assembly 2 includes a first battery cell 211, a second battery cell 212, a third battery cell 213, a fourth battery cell 214 and a fifth battery cell 215 arranged in sequence along the first direction X. The first battery cell 211 and the fifth battery cell 215 are the outermost battery cells.

[0129] In some embodiments, the first heat conducting portion 31 a is located between the third battery cell 213 and the fourth battery cell 214 , and the first heat conducting portion 31 a is connected to the third battery cell 213 and the fourth battery cell 214 respectively, and the first heat conducting portion 31 a conducts heat to the third battery cell 213 and the fourth battery cell 214 .

[0130] In some embodiments, when the battery cell assembly 2 expands, the third battery cell 213 and the fourth battery cell 214 expand in a direction away from the second heat conducting portion 32 a .

[0131] In some embodiments, the second heat conducting portion 32a is located between the first battery cell 211 and the second battery cell 212 , and the second heat conducting portion 32a is connected to the first battery cell 211 and the second battery cell 212 respectively, and the second heat conducting portion 32a conducts heat to the first battery cell 211 and the second battery cell 212 .

[0132] In some embodiments, when the battery cell assembly 2 expands, the first battery cell 211 and the second battery cell 212 expand in a direction away from the first heat conducting portion 31 a .

[0133] In some embodiments, the third heat conducting portion 33a is located between the fourth battery cell 214 and the fifth battery cell 215, and the third heat conducting portion 33a is connected to the fifth battery cell 215. The third heat conducting portion 33a and the fourth battery cell 214 are physically separated, wherein the physical separation means that a gap is formed between the third connecting portion 33b and the fourth battery cell 214, and the gap is not filled with other components, or an insulating member is provided between the third heat conducting portion 33a and the fourth battery cell 214, and the thermal conductivity of the insulating member at 25°C is less than 0.05W / (m·K), so as to reduce the heat transfer from the fourth battery cell 214 to the third heat conducting portion 33a, and the heat of the fourth battery cell 214 is mainly transferred through the first heat conducting portion 31a.

[0134] In some embodiments, when the battery cell assembly 2 expands, the fifth battery cell 215 can expand in a direction close to or away from the fourth battery cell 214, and the third heat conducting portion 33a is only connected to the fifth battery cell 215. When the fifth battery cell 215 expands, the third heat conducting portion 33a can move with the expansion of the fifth battery cell 215.

[0135] In some embodiments, the battery pack includes an elastic member 5 disposed between adjacent battery cells 21, and the elastic member 5 is configured to provide expansion space for the battery cells 21; along the first direction X, the projection of the first connecting portion 31b and the projection of the elastic member 5 are separated, thereby reducing the elastic member 5 from transferring the expansion force of the battery cell 21 to the first connecting portion 31b.

[0136] In some embodiments, the elastic member 5 is foam, which is disposed between adjacent battery cells 21 , and provides expansion space for the battery cells 21 through the compression elasticity of the foam.

[0137] In some embodiments, the elastic member 5 includes a first elastic member 5a and a second elastic member 5b that are spaced apart.

[0138] In other embodiments, the elastic member 5 can be integrally formed, specifically a whole piece of foam, for heat insulation.

[0139] In some embodiments, Figure 7 As shown, the elastic member 5 includes a first elastic member 51 . The first elastic member 51 is disposed between the second battery core 212 and the third battery core 213 . The first elastic member 51 provides expansion space for the second battery core 212 and the third battery core 213 .

[0140] In some embodiments, the buffer 4 provides expansion space for the first battery cell 211. Optionally, the buffer 4 is foam, which has good elasticity and can be compressed to provide expansion space for the first battery cell 211.

[0141] In some embodiments, Figure 7As shown, the elastic member 5 includes a second elastic member 52 , and the second elastic member 52 is disposed between the fourth battery cell 214 and the fifth battery cell 215 , and the second elastic member 52 provides expansion space for the fourth battery cell 214 and the fifth battery cell 215 .

[0142] In some embodiments, the battery pack includes a buffer member 4, a first elastic member 51 and a second elastic member 52 at the same time, and each battery cell 21 has different components to provide expansion space, which is beneficial to improving the service life of the battery pack.

[0143] In some embodiments, along the first direction X, the projection of the first connecting portion 31b is separated from the projection of the first elastic member 51, and the projection of the first heat conducting portion 31a is separated from the projection of the first elastic member 51, thereby reducing the first elastic member 51 from transmitting the expansion force of the battery cell 21 to the first connecting portion 31b and the first heat conducting portion 31a.

[0144] In some embodiments, along the first direction X, the projection of the second connecting portion 32b is separated from the projection of the first elastic member 51, and the projection of the second heat conducting portion 32a is separated from the projection of the first elastic member 51, thereby reducing the first elastic member 51 from transmitting the expansion force of the battery cell 21 to the second connecting portion 32b and the second heat conducting portion 32a.

[0145] In some embodiments, along the first direction X, the projection of the third connecting portion 33b is separated from the projection of the first elastic member 51, and the projection of the third heat conducting portion 33a is separated from the projection of the first elastic member 51, thereby reducing the first elastic member 51 from transmitting the expansion force of the battery cell 21 to the third connecting portion 33b and the third heat conducting portion 33a.

[0146] In some embodiments, along the first direction X, the projection of the third heat conducting portion 33 a is separated from the projection of the second elastic member 52 , thereby reducing the expansion force of the battery cell 21 transmitted by the second elastic member 52 to the third heat conducting portion 33 a .

[0147] In some embodiments, along the first direction X, the projection of the first connecting portion 31b is separated from the projection of the second elastic member 52, and the projection of the first heat conducting portion 31a is separated from the projection of the second elastic member 52, thereby reducing the second elastic member 52 from transmitting the expansion force of the battery cell 21 to the first connecting portion 31b and the first heat conducting portion 31a.

[0148] In some embodiments, along the first direction X, the projection of the second connecting portion 32b is separated from the projection of the second elastic member 52, and the projection of the second heat conducting portion 32a is separated from the projection of the second elastic member 52, thereby reducing the second elastic member 52 from transmitting the expansion force of the battery cell 21 to the second connecting portion 32b and the second heat conducting portion 32a.

[0149] In some embodiments, along the first direction X, the projection of the third connecting portion 33b is separated from the projection of the second elastic member 52, and the projection of the third heat conducting portion 33a is separated from the projection of the second elastic member 52, which reduces the second elastic member 52 transmitting the expansion force of the battery cell 21 to the third connecting portion 33b and the third heat conducting portion 33a.

[0150] In some embodiments, the third heat conducting portion 33 a is located between the first elastic member 5 a and the second elastic member 5 b of the first elastic member 51 .

[0151] In some embodiments, the first heat conducting portion 31 a is located between the first elastic member 5 a and the second elastic member 5 b of the first elastic member 51 .

[0152] In some embodiments, Figures 2 to 7 As shown, the battery cell assembly 2 includes a fixing member 6 , which surrounds the battery cell assembly 2 along the first direction X and the second direction Y. The fixing member 6 limits each battery cell 21 and fixes the multiple battery cells 21 to form the battery cell assembly 2 .

[0153] In some embodiments, along the first direction X, the projection of the fixing member 6 and the projection of the first heat conducting member 31 are separated, so as to reduce the mutual interference between the fixing member 6 and the first heat conducting member 31 and reduce the influence on the heat conduction efficiency of the first heat conducting member 31 .

[0154] Along the first direction X, the projection of the fixing member 6 and the projection of the second heat conducting member 32 are separated from each other, so as to reduce the mutual interference between the fixing member 6 and the second heat conducting member 32 and reduce the influence on the heat conducting efficiency of the second heat conducting member 32 .

[0155] Along the first direction X, the projection of the fixing member 6 and the projection of the third heat conducting member 33 are separated from each other, so as to reduce the mutual interference between the fixing member 6 and the third heat conducting member 33 and thus reduce the influence on the heat conducting efficiency of the third heat conducting member 33 .

[0156] In some embodiments, along the first direction X, the projection of the fixing member 6 and the projection of the elastic member 5 at least partially overlap, and the elastic member 5 provides support for the fixing member 6 , which helps the elastic member provide expansion space for the battery cell 21 .

[0157] In some embodiments, along the first direction X, the projection of the fixing member 6 and the projection of the first elastic member 51 at least partially overlap.

[0158] In some embodiments, along the first direction X, the projection of the fixing member 6 and the projection of the second elastic member 52 at least partially overlap.

[0159] like Fig.21As shown, the length of the battery cell 21 along the second direction Y is L0, the length of the battery cell 21 along the third direction Z is W0, the length of the first heat conductor 31 along the second direction Y is L1, and the length of the first heat conductor 31 along the third direction Z is W1, wherein 2 / 5W0<W1≤W0, and 1 / 2L0<L1<4 / 5L0, which is beneficial to enhance the heat dissipation of the battery cell 21.

[0160] like Fig. 22 As shown, the length of the battery cell 21 along the second direction Y is L0, the length of the battery cell 21 along the third direction Z is W0, the length of the second heat conductor 32 along the second direction Y is L2, and the length of the second heat conductor 32 along the third direction Z is W2, wherein 2 / 5W0<W2≤W0, and 1 / 2L0<L2<4 / 5L0, which is beneficial to enhance the heat dissipation of the battery cell 21.

[0161] like Fig.23 As shown, the length of the battery cell 21 along the second direction Y is L0, the length of the battery cell 21 along the third direction Z is W0, the length of the third heat conductor 33 along the second direction Y is L1, and the length of the third heat conductor 33 along the third direction Z is W1, wherein 2 / 5W0<W1≤W0, and 1 / 2L0<L1<4 / 5L0, which is beneficial to enhance the heat dissipation of the battery cell 21.

[0162] An embodiment of the present application also provides an electrical device, including the battery pack as described above, and the battery pack is used to provide electrical energy.

[0163] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A battery pack comprising: case; A radiator, disposed on the housing; A battery cell assembly is disposed inside the housing, and the battery cell assembly includes a plurality of battery cells; A buffer member, located between the heat sink and the battery core assembly; A first heat-conducting member, comprising a first heat-conducting portion and a first connecting portion; The first heat conducting portion is located between adjacent battery cells, and the first heat conducting portion is connected to at least one of the battery cells; The first connection portion is located between the heat sink and the buffer, the first connection portion is connected to the heat sink, and the first connection portion is connected to the buffer.

2. The battery pack according to claim 1, characterized in that: The heat sink and the battery core assembly are arranged in a first direction; The first heat-conducting member includes a first extending portion, the first extending portion connects the first heat-conducting portion and the first connecting portion; the first extending portion is located on one side of the battery cell assembly along the second direction, and the first extending portion is separated from or in direct contact with each battery cell; The first direction is perpendicular to the second direction.

3. The battery pack according to claim 2, characterized in that: Each of the battery cells comprises an electrode terminal, and the electrode terminal is located on one side of the battery cell along the third direction; The first direction is perpendicular to the second direction and the third direction.

4. The battery pack according to claim 2 or 3, characterized in that: The battery pack includes a second heat-conducting member; the second heat-conducting member includes a second heat-conducting portion, a second extending portion, and a second connecting portion, the second extending portion is located on one side of the battery cell assembly along the second direction, and the second extending portion is separated from or in direct contact with each battery cell; The second heat conducting portion is located between other adjacent battery cells, and the second heat conducting portion is connected to at least one of the two adjacent battery cells; The second connection portion is located between the heat sink and the buffer, the second connection portion is connected to the heat sink, and the second connection portion is connected to the buffer.

5. The battery pack according to claim 4, characterized in that: The first connecting portion is bonded to the buffer member; And / or, the second connecting portion and the buffer component are bonded.

6. The battery pack according to claim 4 or 5, characterized in that: Along the second direction, the first extension portion and the second extension portion are respectively located on two sides of the battery core assembly.

7. The battery pack according to any one of claims 4 to 6, characterized in that: The battery pack includes a third heat-conducting member, the third heat-conducting member includes a third heat-conducting portion, a third extending portion and a third connecting portion, the third extending portion is located on one side of the battery cell assembly along the second direction, and the third extending portion is separated from or in direct contact with each battery cell; The third heat conducting portion is located between other adjacent battery cells, and the third heat conducting portion is connected to at least one of the two adjacent battery cells; The third connection portion is located between the heat sink and the second connection portion, and the third connection portion is connected to the second connection portion; The first heat conducting part, the second heat conducting part, and the third heat conducting part are connected to different battery cells.

8. The battery pack according to claim 7, characterized in that: The third extension portion and the second extension portion are located on the same side of the battery cell assembly, and the first extension portion is located on the other side of the battery cell assembly along the second direction; Along the first direction, the first heat conducting portion is located between the second heat conducting portion and the third heat conducting portion.

9. The battery pack according to claim 7 or 8, characterized in that: The second connection portion and the third connection portion are stacked along the first direction. Along the first direction, a projection of the first connection portion and a projection of the second connection portion are separated, and a projection of the first connection portion and a projection of the third connection portion are separated.

10. The battery pack according to any one of claims 7 to 9, characterized in that: The battery cell assembly comprises a first battery cell, a second battery cell, a third battery cell, a fourth battery cell and a fifth battery cell arranged in sequence along the first direction, wherein the first battery cell and the fifth battery cell are the outermost battery cells of the battery cell assembly; The first heat conducting portion is located between the third battery core and the fourth battery core, and the first heat conducting portion is connected to the third battery core and the fourth battery core respectively; The second heat conducting portion is located between the first battery core and the second battery core, and the second heat conducting portion is connected to the first battery core and the second battery core respectively; The third heat conducting portion is located between the fourth battery cell and the fifth battery cell, and the third heat conducting portion is connected to the fifth battery cell; The third heat conducting part and the fourth battery core are physically separated, or a heat insulating member is provided between the third heat conducting part and the fourth battery core, and the heat conductivity of the heat insulating member at 25° C. is less than 0.05 W / (m·K).

11. The battery pack according to any one of claims 2 to 10, characterized in that: The battery pack includes an elastic member disposed between adjacent battery cells, wherein the elastic member is configured to provide expansion space for the battery cells; Along the first direction, a projection of the first connecting portion and a projection of the elastic member are separated from each other.

12. The battery pack according to claim 10, characterized in that: The battery pack includes a first elastic member, the first elastic member is disposed between the second battery cell and the third battery cell, and the first elastic member is configured to provide expansion space for the second battery cell and the third battery cell; And / or, the battery pack includes a second elastic member, the second elastic member is disposed between the fourth battery cell and the fifth battery cell, and the second elastic member is configured to provide expansion space for the fourth battery cell and the fifth battery cell; The buffer is configured to provide an expansion space for the first battery cell.

13. The battery pack according to any one of claims 7 to 10, characterized in that: The first heat conducting member comprises a first bending portion, the first bending portion connects the first connecting portion and the first extending portion, and a gap is formed between the first bending portion and the battery core assembly; And / or, the second heat conducting member includes a second bending portion, the second bending portion connects the second connecting portion and the second extending portion, and a gap is formed between the second bending portion and the battery core assembly; And / or, the third heat conducting member includes a third bending portion, the third bending portion connects the third connecting portion and the third extending portion, and a gap is formed between the third bending portion and the battery core assembly.

14. The battery pack according to any one of claims 7 to 10, characterized in that: The first heat-conducting member, the second heat-conducting member and the third heat-conducting member are all graphite heat-conducting members; The first heat conducting member, the second heat conducting member and the third heat conducting member all include graphite layers. Both side surfaces of the graphite layers along the first direction are respectively covered with insulating layers, and the insulating layers are bonded and fixed to the graphite layers.

15. The battery pack according to claim 14, characterized in that: The planar thermal conductivity of the graphite heat conducting member at 25° C. is greater than or equal to 800 w / (mk) and less than or equal to 2000 w / (mk).

16. The battery pack according to any one of claims 2 to 15, characterized in that: The battery cell assembly includes a fixing member, the fixing member surrounds the battery cell assembly along the first direction and the second direction, and the fixing member fixes the plurality of battery cells; Along the first direction, a projection of the fixing member and a projection of the first heat conducting member are separated from each other.

17. The battery pack according to claim 16, characterized in that: The battery pack includes an elastic member disposed between adjacent battery cells, wherein the elastic member is configured to provide expansion space for the battery cells; Along the first direction, a projection of the fixing member and a projection of the elastic member at least partially overlap.

18. The battery pack according to any one of claims 1 to 17, characterized in that: The housing comprises a top wall having an opening, and the heat sink is arranged at the opening; The surface of the heat sink facing the battery core assembly is flush with the inner surface of the top wall, or the surface of the heat sink facing the battery core assembly protrudes from the inner surface of the shell.

19. The battery pack according to any one of claims 1 to 18, characterized in that: The first connecting portion is in direct contact with the heat sink.

20. The battery pack according to claim 18, characterized in that: The buffer member is bonded to the top wall.

21. The battery pack according to any one of claims 1 to 20, characterized in that: The connection method is direct contact or bonding connection.

22. An electrical device, characterized in that: The electrical device comprises a battery pack as claimed in any one of claims 1 to 21, wherein the battery pack is used to provide electrical energy.

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