Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment. The battery pack comprises a shell, a battery cell assembly and a second heat conduction part, the shell comprises a first side wall. The battery cell assembly is arranged in the shell, the battery cell assembly comprises a plurality of battery cell units, each battery cell unit comprises a battery cell, a first heat conduction part and an elastic part, the first heat conduction part is connected to the surface of the battery cell, and the elastic part is compressed between the battery cell and the first heat conduction part. The second heat conduction piece is arranged in the shell and located between the first side wall and the first heat conduction piece, and the first heat conduction piece and the first side wall are connected through the second heat conduction piece.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] Currently, battery packs are widely used in drones, electric mobility tools, smart energy storage devices, and other fields. When a battery pack is in use, the battery cells generate a large amount of heat. To prevent the battery pack from overheating, the battery cells need to be cooled. Summary of the Invention

[0003] In view of this, it is necessary to provide a battery pack and an electrical device to improve the heat dissipation of the battery pack.

[0004] An embodiment of the present application provides a battery pack, comprising a shell, a battery cell assembly and a second heat-conducting member. The shell comprises a first side wall. The battery cell assembly is arranged in the shell, and the battery cell assembly comprises a plurality of battery cell units, and the battery cell unit comprises a battery cell, a first heat-conducting member and an elastic member, the first heat-conducting member is connected to the surface of the battery cell, and the elastic member is compressed between the battery cell and the first heat-conducting member. The second heat-conducting member is arranged in the shell, and the second heat-conducting member is located between the first side wall and the first heat-conducting member, and connects the first heat-conducting member and the first side wall. The heat of the battery cell is transferred to the second heat-conducting member through the first heat-conducting member, transferred to the first side wall through the second heat-conducting member, and transferred to the outside of the battery pack through the first side wall, dissipating heat for each battery cell unit, reducing the temperature difference between the battery cell units, and the second heat-conducting member is abutted against the first heat-conducting member and the first side wall through the elastic member, which is conducive to heat dissipation.

[0005] In one or more of the above optional embodiments, the hardness shore OO of the second heat conductive member is 10~50 degrees, so that the second heat conductive member is flexibly arranged, and the second heat conductive member also acts as a buffer between the first side wall and the first heat conductive member, reducing the risk of hard contact between the first heat conductive member and the first side wall, thereby causing damage to the first heat conductive member.

[0006] In one or more of the above optional embodiments, the thermal conductivity of the second heat-conducting member is greater than 3 W / (m·K), which is beneficial to improving heat dissipation efficiency.

[0007] In one or more optional embodiments above, the battery pack includes a support member located between the first heat conductor and the second heat conductor, a gap is provided between at least two adjacent battery cell units, the support member covers the gap, and the gap is configured to provide expansion space for the battery cell. The second heat conductor is in contact with and connected to the first heat conductor adjacent to the gap. The risk of the second heat conductor falling into the gap is reduced. The second heat conductor is in contact with and connected to the first heat conductor of each battery cell unit, which is beneficial for heat dissipation of each battery cell.

[0008] In one or more of the above optional embodiments, the support member is provided with a first opening, and the first heat conductive member adjacent to the gap is exposed through the first opening. The second heat conductive member is in contact with and connected to the first heat conductive member exposed through the first opening. The second heat conductive member is connected to the battery cell units covered by the support member through the first opening, thereby facilitating contact and connection between the second heat conductive member and the first heat conductive member of each battery cell unit, thereby facilitating heat dissipation.

[0009] In one or more of the above optional embodiments, the battery pack includes a buffer member located between adjacent battery cells, such that a gap is formed between the adjacent battery cells, and the buffer member is connected to the adjacent battery cells. The support member is connected to the portion of the two battery cells connected to the buffer member. Reducing the area of ​​the battery cells covered by the support member facilitates heat dissipation.

[0010] In one or more optional embodiments above, the support member is bonded to the battery cell unit connected to the buffer member, and / or the support member is bonded to the second heat conducting member, so as to facilitate fixing the position of the support member.

[0011] In one or more optional embodiments above, a plurality of battery cell units are stacked along a first direction. Each battery cell includes a battery cell housing and an electrode terminal, and the battery cell housing includes two side portions and two ends arranged along the first direction, and the side portions are connected to the two ends. The first heat conductor is connected to at least one side portion and one end portion, and along the second direction, the elastic member is compressed between the first heat conductor and the side portion connected to the first heat conductor. The elastic member is arranged between the side sealing portion and the first heat conductor, which is conducive to compensating for assembly tolerances, so that the second heat conductor abuts the first heat conductor and the housing, which is conducive to heat dissipation.

[0012] In one or more of the above optional embodiments, the side portion includes a side sealing portion, and the elastic member is compressed between the first heat conducting member and the side sealing portion.

[0013] In one or more of the above optional embodiments, the first heat conducting member is disposed around the battery cell along the first direction, and the first heat conducting member covers both side portions, one end portion, and at least a portion of the other end portion, thereby increasing the connection area between the first heat conducting member and the battery cell and enhancing heat dissipation.

[0014] In one or more of the above optional embodiments, the first heat conductor has a second opening, with a portion of the other end exposed to the second opening. The battery pack includes a heating film, which is exposed to the second opening. The heating film contacts the other end of the battery cell through the second opening. The battery cell is heated by the heating film.

[0015] In one or more of the above optional embodiments, each battery cell unit is provided with a battery cell. When the multiple battery cell units are arranged in the first direction, the side sealing portion and the first heat conducting member are connected by an elastic member, so that each battery cell can be independently cooled, which is beneficial to reducing the temperature difference between the battery cells.

[0016] In one or more of the above optional embodiments, the thermal conductivity of the first heat-conducting member is greater than 150 W / (m·K), which is beneficial to improving heat dissipation efficiency.

[0017] In one or more of the above optional embodiments, the first heat conducting member includes a graphite sheet or a graphene sheet. The graphite sheet or graphene sheet is generally relatively soft, and during the assembly process, the operator can conveniently bend the graphite sheet or graphene sheet and wrap it around the battery core to form the first heat conducting member.

[0018] In one or more optional embodiments above, the number of battery cell units is N, where N is a natural number greater than 1, and the N battery cell units are stacked along a first direction, and the housing includes a third side wall and a fourth side wall spaced apart along the first direction. The battery pack includes a first thermal insulation member and a second thermal insulation member, the first thermal insulation member connects the third side wall and the first battery cell unit, and the second thermal insulation member connects the fourth side wall and the Nth battery cell unit; the thermal conductivity of the first thermal insulation member is less than 0.1w / mk, and the thermal conductivity of the second thermal insulation member is less than 0.1w / mk. The battery cell located in the middle position has a higher temperature than the two battery cell units located on the outermost side, and has a lower heat dissipation efficiency than the two battery cell units located on the outermost side. Reducing the heat dissipation of the two battery cell units located on the outermost side by using the first thermal insulation member and the second thermal insulation member is beneficial to reducing the temperature difference between the battery cell units.

[0019] In one or more of the above optional embodiments, the battery cell housing includes two side seals arranged along the second direction, and the first heat conductive member covers the two side seals. The battery pack includes two second heat conductive members, one of which connects the first side wall and a portion of the first heat conductive member near the first side wall, and the other connects the second side wall and a portion of the first heat conductive member near the second side wall. This increases the heat dissipation area between the battery cell and the housing, thereby improving heat dissipation efficiency.

[0020] In one or more of the above optional embodiments, two adjacent first heat conducting members are symmetrically arranged along the first direction, wherein the second opening of one first heat conducting member is opposite to the second opening of the other first heat conducting member. A heating film can heat two adjacent battery cells through the two second openings.

[0021] In one or more of the above optional embodiments, the support member includes a graphite sheet or a polycarbonate sheet.

[0022] In one or more of the above optional embodiments, the thickness d of the support member is 0.05 mm ≤ d ≤ 0.1 mm. Reducing the thickness of the support member is beneficial to heat dissipation.

[0023] An embodiment of the present application provides an electrical device, comprising the battery pack in any one of the above embodiments.

[0024] The heat of the battery cells of the above-mentioned battery pack and electrical equipment is transferred to the second heat-conducting member through the first heat-conducting member, transferred to the first side wall through the second heat-conducting member, and transferred to the outside of the battery pack through the first side wall, thereby dissipating heat for each battery cell unit and reducing the temperature difference between the battery cell units. The second heat-conducting member is abutted against the first heat-conducting member and the first side wall by the elastic member, which is conducive to heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagrams of the structure of battery packs in some embodiments are shown.

[0026] Figure 2 An exploded schematic diagram of a battery pack in some embodiments is shown.

[0027] Figure 3 A partial structural schematic diagram of a battery pack in some embodiments is shown.

[0028] Figure 4 Shown Figure 3 Enlarged structural diagram at point A in the middle.

[0029] Figure 5 Schematic diagrams of the structures of battery cell units in some embodiments are shown.

[0030] Figure 6 A schematic structural diagram of a battery cell unit from another perspective in some embodiments is shown.

[0031] Figure 7 Schematic diagrams of the structure of the first heat conducting member in some embodiments are shown.

[0032] Figure 8 Schematic diagrams of the structures of the first heat conducting member and the heating film in some embodiments are shown.

[0033] Figure 9 Schematic diagrams of the structures of the first heat conducting member in other embodiments are shown.

[0034] Figure 10 A partial structural schematic diagram of a battery pack in some embodiments is shown.

[0035] Figure 11 Shown Figure 10 Schematic diagram of the disassembled part of the battery pack.

[0036] Figure 12 Schematic diagrams of the structures of support members in other embodiments are shown.

[0037] Figure 13 A partial structural schematic diagram of a battery pack in some embodiments is shown.

[0038] Figure 14 A simplified schematic diagram of electrical equipment in some embodiments is shown.

[0039] Description of main component symbols: Battery Pack 100 Housing 10 First side wall 11 Second side wall 12 The third side wall 13 Fourth side wall 14 Battery cell assembly 20 Battery pack 20A Battery cells 21, 21a1, 21a2, 21a3, 21a4 Gap 201 Battery Cell 211 Battery shell 2111 Electrode terminal 2112 Top seal portion 2111a Side seal portion 2111b Side 2111c End 2111d First heat conducting member 212 Second opening 212a First paragraph 2121 Second paragraph 2122 Section 3 2123 Elastic member 213 Second heat conducting member 30 Buffer 40 Support member 50 First opening 51 Support portion 501 Connector 60 Containment Space 101 First circuit board 102 Second circuit board 103 Flexible circuit board 104 Harness 105 Heating film 110 Strap 120 First thermal insulation member 130 Second thermal insulation member 140 Electrical equipment 200 First direction X Second direction Y The third direction Z The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there may be a component intervening therebetween. When a component is referred to as being “connected to” another component, it can be directly connected to the other component or there may be a component intervening therebetween.

[0042] When one component is fixed to another component, the fixing method includes but is not limited to snap connection, bonding, abutment, and fastener connection, such as a screw.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] It can be understood that the term "perpendicular" is used to describe the ideal state between two components. In actual production or use, there may be a state between the two components that is approximately perpendicular or equal. For example, combined with numerical descriptions, perpendicular can refer to the angle between two straight lines being in the range of 90°±10°, perpendicular can also refer to the dihedral angle between two planes being in the range of 90°±10°, and perpendicular can also refer to the angle between a straight line and a plane being in the range of 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0045] Unless otherwise defined, the term "plurality" herein, when used to describe the number of components, specifically means that the components are two or more.

[0046] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0047] See also Figures 1 to 4 An embodiment of the present application provides a battery pack 100 , including a housing 10 and a cell assembly 20 , wherein the cell assembly 20 is disposed in the housing 10 .

[0048] The battery cell assembly 20 includes a plurality of battery cell units 21, each of which includes a battery cell 211, a first heat conducting member 212, and an elastic member 213. The first heat conducting member 212 is connected to the surface of the battery cell 21, and the elastic member 213 is compressed between the battery cell 21 and the first heat conducting member 212. The elastic member 21 can connect the battery cell 21 and the first heat conducting member 212, reducing the tolerance of the battery cell 21 that may cause an unstable connection between the battery cell 21 and the first heat conducting member 212. Optionally, the elastic member 213 includes foam.

[0049] The battery pack 100 includes a second heat conducting member 30 disposed in the housing 10. The housing 10 includes a first side wall 11. The second heat conducting member 30 is located between the first side wall 11 and the first heat conducting member 212 and abuts against the first heat conducting member 212 and the first side wall 11.

[0050] The heat of the battery cell 211 is transferred to the second heat-conducting member 30 through the first heat-conducting member 212, transferred to the first side wall 11 through the second heat-conducting member 30, and transferred to the outside of the battery pack 100 through the first side wall 11, thereby dissipating heat for each battery cell unit 21 and reducing the temperature difference between the battery cell units 21. The elastic member 213 is used to make the second heat-conducting member 30 abut against the first heat-conducting member 212 and the first side wall 11, which is conducive to heat dissipation.

[0051] In some embodiments, the housing 10 includes a second sidewall 12, a third sidewall 13, and a fourth sidewall 14. The first sidewall 11 and the second sidewall 12 are arranged along a second direction Y. The third sidewall 13 and the fourth sidewall 14 are arranged along a first direction X. The third sidewall 13 connects the first sidewall 11 and the second sidewall 12, and the fourth sidewall 14 connects the first sidewall 11 and the second sidewall 12, forming a receiving space 101. A plurality of battery cells 21 are disposed in the receiving space 101. The first direction X is perpendicular to the second direction Y.

[0052] In some embodiments, the second heat conducting member 30 has a Shore OO hardness of 10 to 50 degrees. The second heat conducting member 30 is flexibly configured to act as a buffer between the first sidewall 11 and the first heat conducting member 212, thereby reducing the risk of damage to the first heat conducting member 212 caused by hard contact between the first sidewall 11 and the second heat conducting member 30. Shore OO hardness refers to the hardness index of extremely soft materials on the Shore hardness scale.

[0053] In some embodiments, the thermal conductivity of the first heat-conducting member 212 is greater than 150 W / (m·K), which is beneficial for improving heat dissipation efficiency.

[0054] In some embodiments, the first heat conducting member 212 includes a graphite sheet or a graphene sheet. Graphite sheets or graphene sheets are generally relatively soft, and during assembly, the operator can conveniently bend the graphite sheet or graphene sheet to wrap around the battery cell 211 to form the first heat conducting member 212.

[0055] In some embodiments, the first heat conducting member 212 includes a graphite sheet or a graphene sheet. The thermal conductivity of the first heat conducting member 212 is greater than 1200 W / (m·K), which is conducive to faster heat conduction of the battery cell 211 .

[0056] In some embodiments, the thermal conductivity of the second heat conducting member 30 is greater than 3W / (m·K), which is beneficial for improving heat dissipation efficiency. Optionally, the second heat conducting member 30 includes but is not limited to a silicon-based thermal pad.

[0057] See also Figures 3 to 6 In some embodiments, multiple battery cell units 21 are stacked along a first direction X. Each battery cell 211 includes a battery cell housing 2111, an electrode assembly, and an electrode terminal 2112. The electrode assembly is disposed within the battery cell housing 2111. The electrode terminal 2112 is connected to the electrode assembly and extends out of the battery cell housing 2111. Optionally, the first direction X is the thickness direction of the battery cell 211.

[0058] In some embodiments, each battery cell housing 2111 includes two side portions 2111 c , and the two side portions 2111 c are arranged along a second direction Y. The first direction X is perpendicular to the second direction Y.

[0059] In some embodiments, each battery cell casing 2111 includes two end portions 2111 d , and the two end portions 2111 d are arranged along the first direction X. One side portion 2111 c connects one end of the two end portions 2111 d , and the other side portion 2111 c connects the other end of the two end portions 2111 d .

[0060] In some embodiments, the battery cell 211 includes a prismatic battery cell.

[0061] In some embodiments, the first heat conducting member 212 is connected to at least one side portion 2111c and one end portion 2111d. Along the second direction Y, the elastic member 213 is compressed between the first heat conducting member 212 and one of the side portions 2111c connected to the first heat conducting member 212. The first heat conducting member 212 simultaneously removes heat from both the end portion 2111d and the side portion 2111c.

[0062] In some embodiments, the battery cell 211 comprises a pouch cell. The side portion 2111c includes a side seal portion 2111b, and the elastic member 213 is compressed between the first heat conductive member 212 and the side seal portion 2111b. The elastic member 213 disposed between the side seal portion 2111b and the first heat conductive member 212 facilitates compensating for assembly tolerances, allowing the second heat conductive member 30 to abut against the first heat conductive member 212 and the housing 10, thereby facilitating heat dissipation.

[0063] In some embodiments, the battery cell 211 includes a top sealing portion 2111 a , and the electrode terminal 2112 extends from the top sealing portion 2111 a out of the battery cell housing 2111 .

[0064] In some embodiments, the battery cell housing 2111 includes two side seals 2111b arranged along the second direction Y, and the first heat conductive member 212 covers the two side seals 2111b. The battery pack 100 includes two second heat conductive members 30, one of which connects the first side wall 11 and the first heat conductive member 212 near the first side wall 11, and the other connects the second side wall 12 and the first heat conductive member 212 near the second side wall 12. This increases the heat dissipation area between the battery cell 211 and the housing 10, thereby improving heat dissipation efficiency.

[0065] In some embodiments, one of the first heat conducting members 212 is bonded to the first side wall 11 , and the other first heat conducting member 212 is bonded to the second side wall 12 .

[0066] In some embodiments, each battery cell unit 21 is provided with a battery cell 211. When the multiple battery cell units 21 are arranged along the first direction X, the elastic member 213 connects the side sealing portion 2111b and the first heat conducting member 212, thereby facilitating independent heat dissipation for each battery cell 211 and reducing the temperature difference between the battery cells 211.

[0067] In other embodiments, each battery cell unit 21 includes two battery cells 211 , and the first heat conducting member 212 connects the side sealing portions 2111 b of the two battery cells 211 .

[0068] In some embodiments, the first heat conducting member 212 is disposed around the battery cell 211 along the first direction X. The first heat conducting member 212 covers the two side portions 2111c, one end portion 2111d, and at least a portion of the other end portion 2111d. This increases the connection area between the first heat conducting member 212 and the battery cell 211, thereby enhancing heat dissipation.

[0069] See also Figure 6 and Figure 7 The first heat conducting member 212 is disposed around the battery cell 211 along the first direction X. The first heat conducting member 212 covers the two side portions 2111c, one end portion 2111d, and at least a portion of the other end portion 2111d. A second opening 212a is formed between the two free ends of the first heat conducting member 212.

[0070] See also Figure 9 Along the first direction X, the first heat conductive member 212 is arranged around the battery core 211, the first heat conductive member 212 surrounds the outside of the battery core 211, and the first heat conductive member 212 covers the two side portions 2111c, one end portion 2111d and the other end portion 2111d.

[0071] In some embodiments, the first thermal conductor 212 includes a first section 2121 and a second section 2122. The first section 2121 covers one end portion 2111d, and the second section 2122 connects to the first section 2121 and covers one side portion 2111c. The elastic member 213 connects the side seal portion 2111b and the second section 2122. Some heat from the battery cell 211 is transferred from the first section 2121 to the second section 2122, and from there to the second thermal conductor 30. Optionally, the elastic member 213 is adhesively bonded to the side seal portion 2111b.

[0072] In some embodiments, the first thermal conductor 212 includes a third section 2123. The third section 2123 connects to the end of the second section 2122 facing away from the first section 2121 and connects to a portion of the other end 2111d. Heat from the battery cell 211 is transferred to the second section 2122 through the third section 2123, and then to the second thermal conductor 30 from the second section 2122.

[0073] See also Figures 6 and 7 In some embodiments, the first thermal conductor 212 includes two second segments 2122 and two third segments 2123. One of the second segments 2122 covers one side portion 2111c, and the other second segment 2122 covers the other side portion 2111c. One of the third segments 2123 connects one end of the second segment 2122 facing away from the first segment 2121, and the other third segment 2123 connects the other end of the second segment 2122 facing away from the first segment 2121. The two third segments 2123 are spaced apart along the second direction Y and form a second opening 212a.

[0074] like Figure 9 As shown, in some embodiments, one third segment 2123 is connected to another third segment 2123 , and the first heat conducting member 212 is disposed around the outer periphery of the battery cell housing 2111 .

[0075] In some embodiments, the first section 2121 , the second section 2122 , and the third section 2123 are integrally formed.

[0076] See also Figure 8 In some embodiments, a portion of the other end 2111d is exposed to the second opening 212a. The battery pack 100 includes a heating film 110, which is exposed to the second opening 212a. The heating film 110 heats the battery cell 211. The heating film 110 is connected to the other end 2111d of the battery cell 211 through the second opening 212a. For example, the heating film 110 is connected to the other end 2111d of the battery cell 211 through the second opening 212a. In some embodiments, two adjacent first heat conducting members 212 are symmetrically arranged along the first direction X, wherein the second opening 212a of one first heat conducting member 212 is opposite to the second opening 212a of the other first heat conducting member 212. One heating film 110 can heat two adjacent battery cells 211 through the two second openings 212a.

[0077] See also Figures 10 to 13 In some embodiments, a gap 201 is provided between at least two adjacent battery cell units 21 , and the gap 201 is configured to provide expansion space for the battery cell 211 .

[0078] In some embodiments, the battery pack 100 includes a support member 50 positioned between the first heat conducting member 212 and the second heat conducting member 30. The support member 50 covers the gap 201, reducing the risk of the second heat conducting member 30 falling into the gap 201. The second heat conducting member 30 is in contact with and connected to the first heat conducting member 212 adjacent to the gap 201, strengthening the contact with the first heat conducting member 212 and facilitating heat dissipation from the battery cells 211.

[0079] In some embodiments, the second heat conducting member 30 is in contact with each first heat conducting member 212 , which is beneficial for dissipating heat from each battery cell 211 .

[0080] In some embodiments, support member 50 comprises a graphite sheet or a polycarbonate sheet.

[0081] In some embodiments, the thickness d of the support member 50 is 0.05 mm ≤ d ≤ 0.1 mm. Reducing the thickness of the support member 50 is beneficial to heat dissipation.

[0082] In some embodiments, the support member 50 is integrally provided for ease of assembly. The support member 50 is provided with a first opening 51 that extends through the support member 50 along the second direction Y. The first heat-conducting member 212 adjacent to the gap 201 is exposed through the first opening 51. The second heat-conducting member 30 is in contact with and connected to the first heat-conducting member 212 exposed through the first opening 51. The second heat-conducting member 30 is connected to the battery cell 21 covered by the support member 50 through the first opening 51, facilitating contact and connection between the second heat-conducting member 30 and the first heat-conducting member 212 of the battery cell 21, thereby facilitating heat dissipation.

[0083] See also Figure 10In some embodiments, the battery cell assembly 20 includes adjacent battery cells 21a1, 21a2, 21a3, and 21a4, wherein the battery cells 21a1 and 21a2 form a gap 201, and the battery cells 21a3 and 21a4 form a gap 201. The support member 50 connects portions of the battery cells 21a1 and 21a2 and covers the gap 201 between the battery cells 21a1 and 21a2. The support member 50 connects portions of the battery cells 21a3 and 21a4 and covers the gap 201 between the battery cells 21a3 and 21a4. A portion of the battery cell 21a2 is exposed from the first opening 51, and the exposed portion is in contact with the second heat conductive member 30. A portion of the battery cell 21a3 is exposed from the first opening 51, and the exposed portion is in contact with the second heat conductive member 30.

[0084] In some embodiments, the battery pack 100 includes two support members 50 and two second heat conducting members 30 . Along the second direction Y, one support member 50 covers one end of the gap 201 , and the other support member 50 covers the other end of the gap 201 . Each second heat conducting member 30 covers one support member 50 .

[0085] In some embodiments, see Figure 12 The support member 50 is set separately, and the support member 50 includes two support parts 501. Each support part 501 connects every two adjacent battery cell units 21 and covers the gap 201 between the two adjacent battery cell units 21, reducing the area of ​​the covered first heat conductor 212, which is conducive to heat dissipation.

[0086] In some embodiments, the battery pack 100 includes a buffer 40, which is disposed between adjacent battery cells 21 so that a gap 201 is provided between the adjacent battery cells 21, and the buffer 40 is connected to the adjacent battery cells 21. Optionally, the buffer 40 is in contact with and connected to the adjacent battery cells 21. Optionally, the buffer 40 is bonded to the adjacent battery cells 21. Optionally, the battery pack 100 includes a strap 120, which surrounds the periphery of the battery cell assembly 20 so that the buffer 40 and the adjacent battery cells 21 abut against each other. Optionally, the buffer 40 includes foam.

[0087] In some embodiments, the support member 50 is connected to the portion of the two battery cell units 21 connected to the buffer member 40 , reducing the area of ​​the battery cell units 21 covered by the support member 50 , which is beneficial to heat dissipation.

[0088] In some embodiments, two battery cells 211 are used as a battery cell group 20A, and a buffer 40 is provided between adjacent battery cell groups 20A. The support member 50 connects the side sealing portions 2111b of the battery cells 211 connected to the buffer 40 in the two battery cell groups 20A.

[0089] In some embodiments, two buffer members 40 are disposed between two adjacent battery cells 211 , and the two buffer members 40 are spaced apart along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0090] In some embodiments, the buffer 40 is separated from the first heat conductor 212 , where separation means that the projection of the buffer 40 does not overlap with the projection of the first heat conductor 212 along the first direction X, thereby reducing the risk of the battery cell 211 expanding and causing the buffer 40 to damage the first heat conductor 212 .

[0091] In some embodiments, the support member 50 is bonded to the battery cell unit 21 connected to the buffer member 40 to facilitate fixing the position of the support member 50 .

[0092] In some embodiments, the support member 50 is bonded to the second heat conducting member 30 to fix the position of the support member 50 .

[0093] In some embodiments, the support member 50 is bonded to the battery cell unit 21 connected to the buffer member 40 and to the second heat conducting member 30 , so as to further fix the position of the support member 50 .

[0094] During assembly, the support member 50 is first bonded to the first heat conducting member 212, and then the second heat conducting member 30 is bonded or contact-connected to the support member 50. Alternatively, the support member 50 is first bonded to the second heat conducting member 30, and then the support member 50 is bonded or contact-connected to the first heat conducting member 212.

[0095] See also Figure 2 In some embodiments, the number of battery cells 21 is N, where N is a natural number greater than 1, and the N battery cells 21 are stacked along a first direction X. The battery pack 100 includes a first thermal insulator 130 and a second thermal insulator 140. The first thermal insulator 130 connects the third side wall 13 and the first battery cell 21, and the second thermal insulator 140 connects the fourth side wall 14 and the Nth battery cell 21. The thermal conductivity of the first thermal insulator 130 is less than 0.1 W / mK, and the thermal conductivity of the second thermal insulator 140 is less than 0.1 W / mK. The battery cell 21 located in the middle has a higher temperature than the two outermost battery cells 21 and a lower heat dissipation efficiency than the two outermost battery cells 21. The first thermal insulator 130 and the second thermal insulator 140 reduce heat dissipation from the two outermost battery cells 21, thereby reducing the temperature difference between the battery cells 21.

[0096] See also Figure 2 and Figure 11 In some embodiments, the battery pack 100 includes a first circuit board 102 , and the electrode terminal 2112 is electrically connected to the first circuit board 102 .

[0097] Optionally, the first circuit board 102 includes a printed circuit board (PCB).

[0098] In some embodiments, the battery pack 100 includes a second circuit board 103, which is electrically connected to the first circuit board 102. Optionally, the second circuit board 103 is connected to the first circuit board 102 via a flexible circuit board 104. The electrical energy of the battery cell assembly 20 is transmitted to the second circuit board 103 via the flexible circuit board 104.

[0099] In some embodiments, the battery pack 100 includes a wiring harness 105 . The wiring harness 105 connects the first circuit board 102 and the second circuit board 103 . The wiring harness 105 is configured to transmit signals including but not limited to information such as the temperature, current, voltage, and resistance of the battery cells 211 .

[0100] Optionally, the second circuit board 103 includes a printed circuit board (PCB), and a BMS component (Battery Management System) is provided on the second circuit board 103. The BMS component includes multiple electronic components, which can realize functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 211.

[0101] In some embodiments, a connector 60 is provided on the second circuit board 103 . The connector 60 is exposed outside the housing 10 . The connector 60 is configured to connect to an external electrical device.

[0102] See also Figure 14 The present application also provides an electric device 200 using at least one of the above-mentioned battery packs 100. The electric device 200 includes an electric device body, and the battery pack 100 is electrically connected to the electric device body.

[0103] In one embodiment, the electrical device 200 of the present application may be, but is not limited to, electronic equipment, drones, backup power supplies, electric vehicles, electric motorcycles, electric power-assisted bicycles, electric tools, etc.

[0104] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments fall within the scope disclosed in the present application.

Claims

1. A battery pack, characterized in that: include: a housing comprising a first side wall; A battery cell assembly is provided in the housing, the battery cell assembly includes a plurality of battery cell units, the battery cell units include a battery cell, a first heat conductive member and an elastic member, the first heat conductive member is connected to the surface of the battery cell, and the elastic member is compressed between the battery cell and the first heat conductive member; The second heat conducting member is disposed in the housing, and is located between the first side wall and the first heat conducting member, and connects the first heat conducting member and the first side wall.

2. The battery pack according to claim 1, wherein: The second heat conducting member has a hardness of shore OO of 10 to 50 degrees.

3. The battery pack according to claim 1 or 2, wherein: The thermal conductivity of the second heat-conducting member is greater than 3 W / (m·K).

4. The battery pack according to any one of claims 1 to 3, wherein: The battery pack includes a support member located between the first heat conductive member and the second heat conductive member, a gap is formed between at least two adjacent battery cell units, the support member covers the gap, and the gap is configured to provide expansion space for the battery cell; The second heat conducting member is in contact with and connected to the first heat conducting member adjacent to the gap.

5. The battery pack according to claim 4, wherein: The support member is provided with a first opening, and the first heat conducting member adjacent to the gap is exposed from the first opening; The second heat conducting member is in contact with and connected to the first heat conducting member exposed from the first opening.

6. The battery pack according to claim 4 or 5, wherein: The battery pack includes a buffer located between adjacent battery cells, so that the gap is formed between the adjacent battery cells, and the buffer is connected to the adjacent battery cells; The supporting member is connected to the parts of the two battery core units connected to the buffer member.

7. The battery pack according to claim 6, wherein: The support member is bonded to the battery core unit connected to the buffer member, and / or the support member is bonded to the second heat conducting member.

8. The battery pack according to any one of claims 1 to 7, wherein: A plurality of the battery core units are stacked along a first direction; Each of the battery cells includes a battery cell housing and an electrode terminal, wherein the battery cell housing includes two side portions and two ends arranged along a first direction, wherein the side portions connect the two ends; The first heat conducting member is connected to at least one of the side portions and one of the end portions, and the elastic member is compressed between the first heat conducting member and the side portion to which the first heat conducting member is connected.

9. The battery pack according to claim 8, wherein: The side portion includes a side sealing portion, and the elastic member is compressed between the first heat conducting member and the side sealing portion.

10. The battery pack according to claim 8 or 9, wherein: Along the first direction, the first heat conducting member is disposed around the battery core, and the first heat conducting member covers the two side portions, one of the end portions, and at least a portion of the other end portion.

11. The battery pack according to claim 10, wherein: The first heat conducting member is provided with a second opening, and a portion of the other end portion is exposed to the second opening; The battery pack includes a heating film exposed to the second opening.

12. The battery pack according to any one of claims 1 to 11, wherein: Each of the battery cell units is provided with one battery cell.

13. The battery pack according to any one of claims 1 to 12, wherein: The thermal conductivity of the first heat conducting member is greater than 150 W / (m·K).

14. The battery pack according to claim 13, wherein: The first heat conducting member includes a graphite sheet or a graphene sheet.

15. The battery pack according to any one of claims 1 to 14, wherein: The number of the battery cell units is N, where N is a natural number greater than 1, and the N battery cell units are stacked along a first direction, and the housing includes a third side wall and a fourth side wall spaced apart along the first direction; The battery pack includes a first thermal insulation member and a second thermal insulation member, the first thermal insulation member connects the third side wall and the first battery cell unit, and the second thermal insulation member connects the fourth side wall and the Nth battery cell unit; the thermal conductivity of the first thermal insulation member is less than 0.1w / mk, and the thermal conductivity of the second thermal insulation member is less than 0.1w / mk.

16. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 15.

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