Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment with the battery pack. The battery pack comprises a shell assembly, a battery cell assembly, a first circuit board, a bracket and a heat conduction piece, the battery core assembly is accommodated in the shell assembly; the battery cell assembly comprises a plurality of battery cells. Each battery cell comprises a battery cell shell, an electrode assembly arranged in the battery cell shell and an electrode terminal which is connected with the electrode assembly and extends out of the battery cell shell; and the electrode terminal penetrates through the first circuit board and is connected with one side, deviating from the battery cell shell, of the first circuit board. The bracket is connected with the first circuit board; the first circuit board is arranged between the battery cell shell and the bracket; the support is provided with a first opening, and the heat conduction piece is arranged in the first opening. The heat-conducting member is connected to at least part of the electrode terminals. The first opening is formed in the support, the first opening of the heat conduction piece and the heat conduction piece are connected with at least part of the electrode terminal, heat of the electrode terminal is dissipated through the heat conduction piece, and the heat dissipation efficiency is improved.

Description

[0001] This application is a divisional application of application No. 202310072875.1, titled "Battery pack and electric device", filed on January 17, 2023. TECHNICAL FIELD

[0002] The present application relates to the technical field of energy storage, in particular to a battery pack and an electric device. BACKGROUND

[0003] When the battery is in use, the battery cell will generate a large amount of heat. In order to avoid the battery temperature being too high, the battery needs to be cooled. The traditional cooling method is to increase the cooling part between the battery cells. However, this cooling method has limited cooling effect on the battery cell. SUMMARY

[0004] Therefore, it is necessary to provide a battery pack and an electric device to improve the cooling of the battery cell.

[0005] Embodiments of the present application provide a battery pack, which comprises a shell assembly, a battery cell assembly, a first circuit board, a support and a heat conduction part. The battery cell assembly is accommodated in the shell assembly. The battery cell assembly comprises a plurality of battery cells. Each battery cell comprises a battery cell shell, an electrode assembly arranged in the battery cell shell, and an electrode terminal connected to the electrode assembly and extending out of the battery cell shell. The electrode terminal penetrates the first circuit board and is connected to the side of the first circuit board away from the battery cell shell. The support is connected to the first circuit board, and the first circuit board is arranged between the battery cell shell and the support. The support is provided with a first opening, and the heat conduction part is arranged in the first opening. The heat conduction part is connected to at least part of the electrode terminal. By arranging the first opening in the support and arranging the heat conduction part in the first opening, the heat conduction part is connected to at least part of the electrode terminal, and the heat of the electrode terminal is dissipated through the heat conduction part, thereby improving the cooling efficiency.

[0006] Optionally, in some embodiments of the present application, the battery cell shell and the first circuit board are arranged along a first direction. The plurality of battery cells are arranged in a stacked manner along a third direction. A first conductive sheet is arranged on the first circuit board. The electrode terminals of adjacent battery cells are connected in a stacked manner through the first circuit board and the first conductive sheet. The heat conduction part is connected to the side of the electrode terminal away from the first conductive sheet, and the third direction is perpendicular to the first direction. By connecting the electrode terminals in a stacked manner through the first circuit board and the first conductive sheet, the heat conduction part is connected to the electrode terminals.

[0007] Optionally, in some embodiments of the present application, the first conductive sheet can be a copper foil arranged on the first circuit board, and the copper foil is connected to the wiring on the first circuit board.

[0008] Optionally, in some embodiments of the present application, the first conductive sheet can be a conductive sheet arranged on the first circuit board, and the conductive sheet is welded to the first circuit board.

[0009] Optionally, in some embodiments of the application, the electrode terminal connected to the first conductive sheet includes two first ends arranged along a second direction. The first opening includes two first edges arranged along the second direction. Viewed along a direction opposite to the first direction, along the second direction, the two first edges are between the two first ends, and the second direction is perpendicular to the first direction. The side end of the electrode terminal is away from the first opening, reducing the possibility of the burr of the electrode terminal piercing the heat conduction member.

[0010] Optionally, in some embodiments of the application, the first conductive sheet includes two second ends arranged along a second direction. Viewed along a direction opposite to the first direction, along the second direction, the two first ends are between the two second ends. The side end of the first conductive sheet is away from the first opening, reducing the possibility of the burr of the first conductive sheet piercing the heat conduction member.

[0011] Optionally, in some embodiments of the application, the heat sink is further included. The heat sink is arranged on the side of the bracket away from the first circuit board. The heat conduction member includes a first surface and a second surface arranged opposite along a first direction. The first surface connects at least part of the electrode terminal through the first opening. The second surface connects the heat sink. By arranging the heat sink, the heat of the electrode terminal is conducted to the second surface through the first surface, and then conducted to the heat sink through the second surface, which is conducive to conducting the heat of the electrode terminal.

[0012] Optionally, in some embodiments of the application, the first surface protrudes out of the first opening along a direction opposite to the first direction, facilitating the first surface to connect the soldering part of the electrode terminal. The second surface protrudes out of the first opening along the first direction and is connected to the heat sink, facilitating the second surface to connect the heat sink.

[0013] Optionally, in some embodiments of the application, the housing assembly includes a first housing. The first housing includes a first wall and a second wall arranged along a third direction, a third wall and a fourth wall arranged along a second direction, and a bottom wall. The bottom wall connects the first wall, the second wall, the third wall, and the fourth wall and forms a first space. The heat sink is arranged in the first space. The heat sink is connected to the inner surfaces of the first wall, the second wall, the third wall, and the fourth wall, so as to fix the heat sink to the inner wall of the first housing.

[0014] Optionally, in some embodiments of the application, the first connecting member is further included. The first connecting member is partially arranged between the bracket and the heat sink. The bracket and the heat sink are bonded through the first connecting member, so as to seal and insulate the space between the battery cell assembly and the heat sink, reducing the risk of short circuit between the heat sink and the electrode terminal.

[0015] Optionally, in some embodiments of the present application, the bracket is provided with a first protrusion on a side thereof facing the heat sink in the first direction. The first protrusion is connected to the heat sink. The bracket and the heat sink have a first gap therebetween. The first connector is partially arranged in the first gap. The first gap between the bracket and the heat sink is formed by the first protrusion, which facilitates the arrangement of the first connector in the first gap to seal and insulate the space between the bracket and the heat sink.

[0016] Optionally, in some embodiments of the present application, the bracket includes a bracket body. The first opening is arranged in the bracket body. The bracket body is provided with a plurality of first through holes. At least one of the first through holes is configured to allow the first connector to flow into the first gap. At least part of the first connector is arranged in the at least one first through hole. The first through holes are arranged to facilitate the flow of the first connector into the first gap.

[0017] Optionally, in some embodiments of the present application, as viewed in a direction opposite to the first direction, at least part of the electrode terminal is located in the first through hole, which further improves heat dissipation of the electrode terminal; and / or As viewed in a direction opposite to the first direction, at least part of the first conductive sheet is located in the first through hole, which further improves heat dissipation of the first conductive sheet.

[0018] Optionally, in some embodiments of the present application, the bracket includes a bracket body, which covers part of the first circuit board to insulate the first circuit board.

[0019] Optionally, in some embodiments of the present application, the first connector is partially arranged between the bracket and the first circuit board. The bracket and the first circuit board are connected by the first connector, which further insulates the first circuit board.

[0020] Optionally, in some embodiments of the present application, the bracket is provided with a second protrusion on a side thereof facing the first circuit board in a direction opposite to the first direction. The second protrusion is connected to the first circuit board. The bracket and the first circuit board have a second gap therebetween. The first connector is partially arranged in the second gap. The second gap between the bracket and the first circuit board is formed by the second protrusion, which facilitates the arrangement of the first connector in the second gap to seal and insulate the space between the bracket and the second gap.

[0021] Optionally, in some embodiments of the present application, the first connector covers the part of the electrode terminal extending out of the cell shell, which strengthens the fixation of the electrode terminal and improves heat dissipation of the electrode terminal.

[0022] Optionally, in some embodiments of the present application, all the third holes allow the first connector to flow between the heat-conducting member and the first circuit board. At least part of the first connector is arranged in the third hole, which improves heat dissipation.

[0023] Optionally, in some embodiments of the present application, the first circuit board is provided with a third hole. The third hole is located in the first opening when viewed in the direction opposite to the first direction, and the third hole is away from the first conductive sheet. The at least one third hole is configured to allow the first connecting member to flow into the heat conduction member and the first circuit board. At least part of the first connecting member is located in the at least one third hole, further improving heat dissipation.

[0024] Optionally, in some embodiments of the present application, the first connecting member is configured to be formed after the battery pack is solidified by flowing the first insulating material.

[0025] Optionally, in some embodiments of the present application, the thermal conductivity D of the heat conduction member satisfies 4 W / (m·K)≤C≤6 W / (m·K), improving the heat conduction effect of the heat conduction member.

[0026] Optionally, in some embodiments of the present application, the thermal conductivity of the heat conduction member is higher than that of the first connecting member, improving the heat conduction effect of the heat conduction member.

[0027] Optionally, in some embodiments of the present application, the first connecting member connects the inner surfaces of the first wall, the second wall, the third wall, and the fourth wall to seal and insulate the first space, and the first connecting member can improve the protection of the battery pack and reduce the influence of external impurities on the first circuit board and the electrode terminals.

[0028] Optionally, in some embodiments of the present application, the first circuit board further comprises a second conductive sheet and a third conductive sheet. In the third direction, the electrode terminals of the one of the cells located at the outermost side are connected to the second conductive sheet, and the electrode terminals of the other of the cells located at the outermost side are connected to the third conductive sheet. The support body is provided with a plurality of second through holes. When viewed in the direction opposite to the first direction, part of the second conductive sheet is located in the second through hole, part of the third conductive sheet is located in the second through hole, and part of the first connecting member is located in the second through hole. The third direction is perpendicular to the first direction. Through the first connecting member in the second through hole, the heat of the electrode terminals connected to the second conductive sheet, the heat of the second conductive sheet, the heat of the electrode terminals connected to the third conductive sheet, and the heat of the third conductive sheet are conducted to the heat sink, which is conducive to heat dissipation.

[0029] Optionally, in some embodiments of the present application, when viewed in the direction opposite to the first direction, part of the fourth conductive sheet is located in the second through hole, and the heat of the electrode terminals connected to the fourth conductive sheet and the heat of the fourth conductive sheet are conducted to the heat sink through the first connecting member in the second through hole, which is conducive to heat dissipation.

[0030] Optionally, in some embodiments of the present application, the first housing is provided with a first opening and a second opening, and the heat sink is provided with a first channel. The first channel communicates the first opening and the second opening, which is conducive to improving the heat dissipation efficiency.

[0031] Optionally, in some embodiments of the present application, a second circuit board and a sampling harness are further included. The heat sink is located between the first circuit board and the second circuit board. The heat sink is provided with a third accommodation space. One end of the sampling harness is connected to the first circuit board, and the other end passes through the third accommodation space and is connected to the second circuit board.

[0032] Optionally, in some embodiments of the present application, a connecting bracket is further included, and a second space is formed between the connecting bracket and the heat sink. The connecting bracket is provided with a bracket through hole. The bracket through hole communicates with the second space, which is conducive to heat dissipation of the heat sink to the second circuit board. An embodiment of the present application further provides a power consumption device including the battery pack in any of the above embodiments.

[0033] The battery pack and the power consumption device described above improve the heat dissipation efficiency by providing the bracket with a first opening and arranging the heat conduction member in the first opening, and connecting the heat conduction member to at least part of the electrode terminals, so that the heat of the electrode terminals is dissipated through the heat conduction member. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A structural schematic diagram of the battery pack in some embodiments is shown.

[0035] Figure 2 A structural schematic diagram of the battery pack in some embodiments is shown.

[0036] Figure 3 A partial structural exploded schematic diagram of the battery pack in some embodiments is shown.

[0037] Figure 4 An exploded schematic diagram in Figure 1 is shown.

[0038] Figure 5 An enlarged schematic diagram of part V in Figure 4 is shown.

[0039] Figure 6 An exploded schematic diagram of the second housing and the second circuit board in some embodiments is shown.

[0040] Figure 7 A structural schematic diagram of a single cell in some embodiments is shown.

[0041] Figure 8 An exploded schematic diagram of a single cell in some embodiments is shown.

[0042] Figure 9 A partial structural schematic diagram of the battery pack in some embodiments is shown.

[0043] Figure 10 An exploded schematic diagram in Figure 9 is shown.

[0044] Figure 11 An exploded schematic view of the battery cell assembly is shown. Figure 10 An exploded schematic view of the battery cell assembly is shown.

[0045] Figure 12 A schematic view of the structure of the battery cell and the first circuit board in some embodiments is shown.

[0046] Figure 13 A schematic view of the structure of the support in some embodiments is shown.

[0047] Figure 14 A schematic view of the structure of the support in some embodiments is shown.

[0048] Figure 15 A schematic view of the structure of the battery cell, the first circuit board and the support in some embodiments is shown.

[0049] Figure 16 A schematic view of the structure of the battery cell, the first circuit board, the support and the heat conducting member in some embodiments is shown.

[0050] Figure 17 A schematic view of the structure of the heat sink in some embodiments is shown.

[0051] Figure 18 A cross-sectional view of the battery pack along IV-IV in some embodiments is shown.

[0052] Figure 19 An enlarged schematic view of the II portion is shown. Figure 18 An enlarged schematic view of the II portion is shown.

[0053] Figure 20 A schematic view of the structure of the electrical device in some embodiments is shown.

[0054] Explanation of main element symbols: Battery pack 100, housing assembly 10, first housing 11, first wall 111, fifth connecting hole 1111, third fastener 1112, fourth fastener 1113, seventh connecting hole 1114, first opening 10a, second wall 112, second opening 10b, third wall 113, first region 113a, first housing insulator 1130, first connecting hole 113b, first fastener 113c, fourth wall 114, third connecting hole 114b, second fastener 114c, bottom wall 115, first space 101, second space 102, second housing 12, second housing recess 12a, second circuit board 13, first connecting part 131, second connecting part 132, connecting bracket 14, bracket through hole 141, battery cell assembly 20, battery cell 21, battery cell housing 211, first outer shell 2111, second outer shell 2112, first extension 2113, second extension 2114, first sealing part 2115, second sealing part 2116, first part 211a, second part 211b, first recess 211c, electrode assembly 212, electrode terminal 213, welding part 213a, first end 2131, first terminal 213b, second terminal 213c, first column of battery cells 21a, second column of battery cells 21b, heat dissipation part 22, first elastic part 221a, first circuit board 30, hole 31, first hole 311, second hole 312, third hole 313, first conductive sheet 32, second end 321, second conductive sheet 33, third conductive sheet 34, fourth conductive sheet 35, fourth hole 36, sampling wire harness 100a, first electrical connecting part 100b, first conductive part 110, first insulating part 120, second electrical connecting part 100c, second conductive part 130, second insulating part 140, bracket 40, first opening 40a, first gap 40b, second gap 40c, third protrusion 40d, first edge 401, bracket main body 41, second opening 42, first protrusion 402, third opening 43, second protrusion 403, fourth opening 45, guide plate 451, first protrusion 46, second protrusion 47, first through hole 48, second through hole 49, heat conduction part 50, first surface 50a, second surface 50b, heat sink 60, first channel 60a, first side wall 60b, second connecting hole 601, second side wall 60c, fourth connecting hole 602, third side wall 60d, sixth connecting hole 603, fourth side wall 60e, eighth connecting hole 604, first containing space 61, second containing space 62, third containing space 63, fourth protrusion 64, first connecting part 70, second insulating part 80, third insulating part 81, fourth insulating part 82, electrically used device 200, first direction X, second direction Y, third direction Z.

[0055] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0056] The following detailed description is presented for purposes of illustration and description. It is not intended to limit the application in scope to the exact details shown and described. Various embodiments presented are described in terms of technical features; these features can be combined in any manner deemed appropriate.

[0057] When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to or "coupled" to another element, it can be directly connected to the other element or intervening elements can also be present.

[0058] It will be understood that the terms "vertical," "horizontal," "bottom," "top," "side," "higher," "lower," "upper," "lower," "up," "down," "vertical," "parallel," "perpendicular," "equal," "approximately equal," "approximately parallel," "approximately perpendicular," and "approximately equal" are used to describe ideal conditions. In actual production or use, the state between two components can exist in a state similar to the ideal state. For example, in combination with numerical description, vertical can refer to the angle between two straight lines within the range of 90°±10°, vertical can also refer to the dihedral angle between two planes within the range of 90°±10°, and vertical can also refer to the angle between a straight line and a plane within the range of 90°±10°. The two components described as "vertical" can not be absolute straight lines, planes, and can be approximately straight lines or planes, and can be considered as "straight lines" or "planes" as a whole from the macroscopic view of the overall extension direction.

[0059] The term "parallel" is used to describe the ideal state between two components. In actual production or use, the state between two components can exist in a state similar to the ideal state. For example, in combination with numerical description, parallel can refer to the angle between two straight lines within the range of 180°±10°, parallel can also refer to the dihedral angle between two planes within the range of 180°±10°, and parallel can also refer to the angle between a straight line and a plane within the range of 180°±10°. The two components described as "parallel" can not be absolute straight lines, planes, and can be approximately straight lines or planes, and can be considered as "straight lines" or "planes" as a whole from the macroscopic view of the overall extension direction.

[0060] Unless otherwise defined, the term "a plurality of" as used herein, specifically refers to two or more of the component when used to describe the number of components.

[0061] Please refer to Figures 1 to 5In an embodiment of the present application, a battery pack 100 is provided, which comprises a housing assembly 10, a cell assembly 20, a first circuit board 30, a bracket 40 and a heat conducting member 50. The cell assembly 20 is arranged in the housing assembly 10. The first circuit board 30 is arranged in the housing assembly 10 and connected to the cell assembly 20. The cell assembly 20 comprises a plurality of cells 21, each of which comprises a cell housing 211, an electrode assembly 212 arranged in the cell housing 211, and an electrode terminal 213 connected to the electrode assembly 212 and led out of the cell housing 211. The electrode terminal 213 penetrates through the first circuit board 30 and is connected to a side of the first circuit board 30 away from the cell housing 211. The bracket 40 is connected to a side of the first circuit board 30 away from the cell assembly 20, the first circuit board 30 is arranged between the cell housing 211 and the bracket 40, and the bracket 40 is provided with a first opening 40a. The heat conducting member 50 is arranged in the first opening 40a and connected to at least part of the electrode terminal 213 through the first opening 40a. The heat of the electrode terminal 213 is dissipated through the heat conducting member 50, thereby improving the heat dissipation efficiency.

[0062] In an embodiment, the housing assembly 10 comprises a first housing 11 and a second housing 12, and the first housing 11 is connected to the second housing 12. The first housing 11 comprises a first wall 111, a second wall 112, a third wall 113, a fourth wall 114 and a bottom wall 115. The first wall 111 and the second wall 112 are arranged opposite to each other, and the third wall 113 and the fourth wall 114 are arranged opposite to each other. The bottom wall 115 is arranged opposite to the second housing 12. The first wall 111 is connected to the third wall 113 and the fourth wall 114, the second wall 112 is connected to the third wall 113 and the fourth wall 114, and the bottom wall 115 is connected to the first wall 111, the second wall 112, the third wall 113 and the fourth wall 114 to form a first space 101 for accommodating at least one of the cell assembly 20, the first circuit board 30, the bracket 40 and the heat conducting member 50.

[0063] Optionally, the first wall 111, the second wall 112, the third wall 113, the fourth wall 114 and the bottom wall 115 can be connected to form the first housing 11 by screw locking, welding or bonding, etc. Optionally, the first wall 111, the second wall 112, the third wall 113, the fourth wall 114 and the bottom wall 115 can also be integrally formed, such as providing an injection molding process to form an integrally formed structure, or by extruding a metal material to form an integrally formed structure.

[0064] Optionally, the first housing 11 comprises a heat conducting material, which can improve the heat dissipation performance. Optionally, the heat conducting material comprises a metal heat conducting material and a heat conducting insulating material, and the insulating material can be covered on the outer surface of the metal heat conducting material. Optionally, the metal heat conducting material of the first housing 11 comprises aluminum. Optionally, the surface of the first housing 11 comprises a heat conducting metal material, which is beneficial to improve the heat dissipation.

[0065] For better illustration of the structure of the battery pack 100, the structure of the battery pack 100 will be described in combination with X, Y and Z coordinate axes, which are perpendicular to each other, and the X direction is defined as the first direction, the Y direction is defined as the second direction, and the Z direction is defined as the third direction. The first direction X is the direction in which the bottom wall 115 and the second shell 12 are oppositely arranged, the second direction Y is the direction in which the third wall 113 and the fourth wall 114 are oppositely arranged, and the third direction Z is the direction in which the first wall 111 and the second wall 112 are oppositely arranged. The first direction X is perpendicular to the second direction Y and the third direction Z.

[0066] In an embodiment, the battery pack 100 further comprises a heat sink 60, which is arranged in the first space 101 and located on the side of the support 40 away from the first circuit board 30. The shell assembly 10 is provided with a first opening 10a and a second opening 10b, which are communicated with the outside. The heat sink 60 is provided with a first channel 60a, which is communicated with the first opening 10a and the second opening 10b. The heat sink 60 dissipates the heat of the electrode terminal 213 from the first opening 10a and the second opening 10b to the outside environment through the first channel 60a, further improving the heat dissipation of the electrode terminal 213 and reducing the temperature of the battery pack 100.

[0067] Optionally, the heat of the first circuit board 30 can also be transmitted to the heat sink 60 through the heat-conducting member 50, and the heat sink 60 can dissipate heat from the first circuit board 30, further improving the heat dissipation of the battery pack 100.

[0068] In an embodiment, the battery pack 100 can utilize external air to carry away the heat of the first circuit board 30 and the cell assembly 20 through air flow. In an embodiment, the battery pack 100 can be used on a device that is static during use. When the battery pack 100 is static, natural wind or external air cooling equipment can be used for heat dissipation. In an embodiment, the battery pack 100 can be used on a device that is dynamic during use, such as a drone, an electric moped, etc. Since the device moves, the air flow speed is faster, and the battery pack 100 can be quickly cooled.

[0069] In an embodiment, the first opening 10a is arranged on the first wall 111, and the second opening 10b is arranged on the second wall 112. In the third direction Z, the first opening 10a penetrates the first wall 111, and the second opening 10b penetrates the second wall 112. The heat sink 60 is connected to the inner surfaces of the first wall 111, the second wall 112, the third wall 113 and the fourth wall 114, and the first channel 60a is in communication with the first opening 10a and the second opening 10b. When the battery pack 100 moves in the third direction Z or the wind direction of the external air cooling device is in the third direction Z, the first opening 10a is the air inlet, the second opening 10b is the air outlet, air enters through the first opening 10a, passes through the first channel 60a, and flows out of the second opening 10b, thereby improving heat dissipation. When the battery pack 100 moves in a direction opposite to the third direction Z or the wind of the external air cooling device is in a direction opposite to the third direction Z, the first opening 10a is the air outlet, and the second opening 10b is the air inlet. Optionally, the first opening 10a can also be arranged on the third wall 113, and the second opening 10b can also be arranged on the fourth wall 114. Optionally, the second opening 10b is arranged on the second wall 112, and the first opening 10a can also be arranged on the third wall 113.

[0070] In an embodiment, in the third direction Z, the projection of the first opening 10a overlaps the projection of the second opening 10b. It can be understood that, in the third direction Z, the projection of the first opening 10a partially overlaps the projection of the second opening 10b, or the projection of the first opening 10a completely covers the projection of the second opening 10b, or the projection of the second opening 10b completely covers the projection of the first opening 10a. In a specific implementation of the present application, in the third direction Z, the projection of the first opening 10a is larger than and covers the projection of the second opening 10b. When the battery pack 100 moves in the third direction Z or the wind direction of the external air cooling device is in the third direction Z, the first opening 10a is the air inlet, the second opening 10b is the air outlet, the aperture of the first opening 10a is larger than the aperture of the second opening 10b, thereby enhancing air convection and further improving heat dissipation.

[0071] Please refer to Figure 3 and Figure 6 In an embodiment, the battery pack 100 further comprises a second circuit board 13. The second housing 12 has a second housing recess 12a, the second circuit board 13 is arranged in the second housing recess 12a, and the second circuit board 13 is arranged in an insulating manner with the second housing 12. In the first direction X, the heat sink 60 is arranged between the first circuit board 30 and the second circuit board 13. The second circuit board 13 is provided with a first connecting portion 131 and a second connecting portion 132, and the first connecting portion 131 and the second connecting portion 132 are electrically connected to the first circuit board 30.

[0072] In an embodiment, the second circuit board 13 comprises a battery management system (BMS) assembly, the BMS assembly comprises a plurality of electronic components, which can realize the functions of control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21. Optionally, the second circuit board 13 comprises a flexible printed circuit (FPC). Optionally, the second circuit board 13 comprises a printed circuit board (PCB), and a plurality of wires (not shown) are arranged on the second circuit board 13.

[0073] In an embodiment, the battery pack 100 further comprises a connecting bracket 14, the connecting bracket 14 is arranged between the first housing 11 and the second housing 12, and the first housing 11 and the second housing 12 are connected to the connecting bracket 14. The connecting bracket 14 is arranged between the second circuit board 13 and the heat sink 60, which can reduce the risk of short circuit between the second circuit board 13 and the heat sink 60. Optionally, the connecting bracket 14 is made of insulating material.

[0074] In an embodiment, a second space 102 is formed between the connecting bracket 14 and the heat sink 60, the connecting bracket 14 is provided with a bracket through hole 141, the bracket through hole 141 communicates the second space 102, which is conducive to heat dissipation of the heat sink 60 to the second circuit board 13. The heat generated by the second circuit board 13 is gathered in the second space 102. When the heat sink 60 is dissipating heat in the first channel 60a, the surface temperature of the heat sink 60 close to the second circuit board 13 is low, and the heat generated by the second circuit board 13 is transferred to the surface of the heat sink 60, which can dissipate heat for the second circuit board 13.

[0075] Please refer to Figure 4 , Figure 5 and Figure 19 In an embodiment, the battery pack 100 further comprises a first connecting piece 70, the first connecting piece 70 is connected to the inner surfaces of the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114, and the first connecting piece 70 adhesively connects the battery cell assembly 20, the first circuit board 30, the bracket 40, and the heat sink 60, seals and insulates the space between the battery cell assembly 20 and the heat sink 60, and can reduce the risk of short circuit between the heat sink 60 and the electrode terminal 213. When the battery pack 100 is subjected to external impact force, the first connecting piece 70 can improve the protection of the battery pack 100 and reduce the influence of external impurities, such as water, on the first circuit board 30 and the electrode terminal 213.

[0076] Optionally, the first connecting member 70 has a good thermal conductivity, which is conducive to improving the heat dissipation of the battery pack 100. The thermal conductivity of the first connecting member 70 is A, where 0.8 W / (m·K)≤A≤3.0 W / (m·K). The thermal conductivity A satisfies any one of 0.9 W / (m·K), 1.0 W / (m·K), 1.1 W / (m·K), 1.2 W / (m·K), 1.3 W / (m·K), 1.4 W / (m·K), 1.5 W / (m·K), 1.6 W / (m·K), 1.7 W / (m·K), 1.8 W / (m·K), 1.9 W / (m·K), 2.0 W / (m·K), 2.1 W / (m·K), 2.2 W / (m·K), 2.3 W / (m·K), 2.4 W / (m·K), 2.5 W / (m·K), 2.6 W / (m·K), 2.7 W / (m·K), 2.8 W / (m·K), 2.9 W / (m·K), 3.0 W / (m·K).

[0077] In an embodiment, the first connecting member 70 is configured to be formed by injecting the flowing first insulating material into the battery pack 100 after the battery pack is cured. Optionally, the first connecting member 70 includes one of polyurethane glue, epoxy glue, and silicone glue, which can reduce the weight of the first connecting member 70. Optionally, the first connecting member 70 includes foaming glue. In an embodiment, the cell assembly 20, the first circuit board 30, the bracket 40, and the heat sink 60 are installed in the first housing 11, and the heat sink 60 is connected to the first housing 11. Then, the first housing 11 is inverted, and the flowing first insulating material is injected into the battery pack 100. After inversion, the heat sink 60, the bracket 40, and the first circuit board 30 are arranged in the first direction in sequence. Optionally, the flowing first insulating material is injected into the battery pack 100 from the bottom of the cell assembly 20 along the first direction X.

[0078] Optionally, the viscosity B of the first connecting member 70 satisfies 800 mpa.s≤A≤1000 mpa.s, which is conducive to better filling the gap between the cell assembly 20, the first circuit board 30, the bracket 40, and the heat sink 60. For example, the viscosity B satisfies any one of 800 mpa.s, 810 mpa.s, 820 mpa.s, 830 mpa.s, 840 mpa.s, 850 mpa.s, 860 mpa.s, 870 mpa.s, 880 mpa.s, 890 mpa.s, 900 mpa.s, 910 mpa.s, 920 mpa.s, 930 mpa.s, 940 mpa.s, 950 mpa.s, 960 mpa.s, 970 mpa.s, 980 mpa.s, 990 mpa.s, 1000 mpa.s.

[0079] Please refer to Figure 3The third wall 113 has a first region 113a provided with a first housing insulation 1130. The heat sink 60 has a first side wall 60b and a second side wall 60c oppositely arranged along the second direction Y. The third wall 113 is connected to the first side wall 60b. The first housing insulation 1130 is located between the first region 113a and the first side wall 60b. The first housing insulation 1130 is arranged in a gap between the first region 113a and the first side wall 60b. When the first housing 11 is inverted to inject the first connecting member 70, the first housing insulation 1130 can reduce the flow of the first insulation material in the gap between the first region 113a and the first side wall 60b. Optionally, the first housing insulation 1130 has thermal conductivity, which can transfer heat on the heat sink 60 to the third wall 113. Optionally, the first housing insulation 1130 includes glue. Optionally, the glue includes thermal conductive glue. Optionally, the thermal conductive glue has a thermal conductivity C in a range of 2.5 W / (m·K) < C ≤ 5.0 W / (m·K). The thermal conductivity C satisfies any one of 2.6 W / (m·K), 2.7 W / (m·K), 2.8 W / (m·K), 2.9 W / (m·K), 3.0 W / (m·K), 3.1 W / (m·K), 3.2 W / (m·K), 3.3 W / (m·K), 3.4 W / (m·K), 3.5 W / (m·K), 3.6 W / (m·K), 3.7 W / (m·K), 3.8 W / (m·K), 3.9 W / (m·K), 4.0 W / (m·K), 4.1 W / (m·K), 4.2 W / (m·K), 4.3 W / (m·K), 4.4 W / (m·K), 4.5 W / (m·K), 4.6 W / (m·K), 4.7 W / (m·K), 4.8 W / (m·K), 4.9 W / (m·K), or 5.0 W / (m·K). Optionally, the first housing insulation 1130 can also limit impurities from the outside into the battery pack 100, such as water.

[0080] Optionally, the fourth wall 114 has a second region (not shown in the figure) provided with a second housing insulation member (not shown in the figure), the fourth wall 114 is connected to the second side wall 60c, and the second housing insulation member is located between the second region and the second side wall 60c to connect the heat sink 60 and the fourth wall 114, and the second housing insulation member is arranged in the gap between the second region and the second side wall 60c, so as to reduce the flow of the flowing insulation material in the gap between the second region and the second side wall 60c when the first housing 11 is inverted to inject the first connecting member 70. Optionally, the second housing insulation member has thermal conductivity, and can transmit heat on the heat sink 60 to the fourth wall 114. Optionally, the second housing insulation member includes glue. Optionally, the glue includes thermal conductive glue. Optionally, the thermal conductive coefficient of the thermal conductive glue ranges from C, where 2.5 W / (m·K) < C ≤ 5.0 W / (m·K). The thermal conductive coefficient C satisfies any one of 2.6 W / (m·K), 2.7 W / (m·K), 2.8 W / (m·K), 2.9 W / (m·K), 3.0 W / (m·K), 3.1 W / (m·K), 3.2 W / (m·K), 3.3 W / (m·K), 3.4 W / (m·K), 3.5 W / (m·K), 3.6 W / (m·K), 3.7 W / (m·K), 3.8 W / (m·K), 3.9 W / (m·K), 4.0 W / (m·K), 4.1 W / (m·K), 4.2 W / (m·K), 4.3 W / (m·K), 4.4 W / (m·K), 4.5 W / (m·K), 4.6 W / (m·K), 4.7 W / (m·K), 4.8 W / (m·K), 4.9 W / (m·K), or 5.0 W / (m·K). Optionally, the second housing insulation member can also prevent impurities and dust from the outside from entering the battery cell assembly 20.

[0081] In an embodiment, the third wall 113 is provided with a first connecting hole 113b, the first side wall 60b is provided with a second connecting hole 601, and the battery pack 100 includes a first fastener 113c, the heat sink 60 is fixed to the third wall 113 by the first fastener 113c passing through the first connecting hole 113b and the second connecting hole 601.

[0082] In an embodiment, the fourth wall 114 is provided with a third connecting hole 114b, the second side wall 60c is provided with a fourth connecting hole 602, and the battery pack 100 includes a second fastener 114c, the heat sink 60 is fixed to the fourth wall 114 by the second fastener 114c passing through the third connecting hole 114b and the fourth connecting hole 602.

[0083] In an embodiment, the first openings 10a and the second openings 10b are each a plurality and the same number, and the projections of the first openings 10a overlap the projections of the second openings 10b in the third direction Z. Optionally, the plurality of first openings 10a are arranged at intervals, and a fifth connecting hole 1111 is arranged between adjacent first openings 10a. The heat sink 60 comprises a third side wall 60d and a fourth side wall 60e arranged opposite in the third direction Z, and the third side wall 60d is provided with a sixth connecting hole 603. In the third direction Z, the projection of the fifth connecting hole 1111 overlaps the projection of the sixth connecting hole 603. The battery pack 100 comprises a third fastener 1112. The third fastener 1112 is arranged at the fifth connecting hole 1111 and the sixth connecting hole 603, and is used to connect the heat sink 60 and the first wall 111.

[0084] In an embodiment, the battery pack 100 comprises a fourth fastener 1113. Optionally, the plurality of second openings 10b are arranged at intervals, and a seventh connecting hole 1114 is arranged between adjacent second openings 10b. The fourth side wall 60e is provided with an eighth connecting hole 604. In the third direction Z, the projection of the seventh connecting hole 1114 overlaps the projection of the eighth connecting hole 604. The fourth fastener 1113 is arranged at the seventh connecting hole 1114 and the eighth connecting hole 604, and is used to connect the heat sink 60 and the second wall 112.

[0085] Please refer to Figure 4 , Figure 7 and Figure 8 In an embodiment, the cell shell 211 comprises a first part 211a and a second part 211b. The first part 211a accommodates the electrode assembly 212, and the second part 211b is connected to the first part 211a. The electrode terminal 213 extends from the second part 211b. Optionally, the first connecting member 70 is arranged between the heat sink 60 and the cell shell 211, and the first connecting member 70 covers the first circuit board 30, the support 40, and the part of the electrode terminal 213 outside the cell shell 211.

[0086] In an embodiment, the cell case 211 comprises a first shell 2111 and a second shell 2112, the first shell 2111 is connected to the second shell 2112. At least one of the first shell 2111 and the second shell 2112 is provided with a first recess 211c, the electrode assembly 212 is arranged in the first recess 211c. The first shell 2111 and the second shell 2112 can be folded along the connection position, so that the first shell 2111 and the second shell 2112 overlap to form a first part 211a to cover the electrode assembly 212. The periphery of the first shell 2111 extends outwardly to form a plurality of first extension parts 2113, and the periphery of the second shell 2112 extends outwardly to form a plurality of second extension parts 2114. After the first shell 2111 and the second shell 2112 are folded along the connection position, the first extension parts 2113 and the second extension parts 2114 overlap and are sealedly connected to form a second part 211b. Optionally, the first extension parts 2113 and the second extension parts 2114 are sealedly connected by a sealing glue. The second part 211b comprises a first sealing part 2115 and a second sealing part 2116, the first sealing part 2115 is arranged opposite to the connection position, and the electrode terminal 213 extends out of the first part 211a from the first sealing part 2115. Optionally, the second part 211b comprises two second sealing parts 2116, and the two second sealing parts 2116 are arranged opposite along the second direction Y. Optionally, the second part 211b comprises one first sealing part 2115, and the cell 21 comprises two electrode terminals 213, and the two electrode terminals 213 extend out of the cell case 211 from the first sealing part 2115. In other embodiments, the first shell 2111 and the second shell 2112 are separated, the second part 211b comprises two first sealing parts 2115, and the two first sealing parts 2115 are arranged opposite along the first direction X, and the cell 21 comprises two electrode terminals 213, one of the two electrode terminals 213 extends out of the cell case 211 from one of the first sealing parts 2115, and the other electrode terminal 213 extends out of the cell case 211 from the other first sealing part 2115, and the two electrode terminals 213 are arranged opposite along the first direction X.

[0087] In an embodiment, the first connecting member 70 covers the part of the electrode terminal 213 extending out of the cell case 211, strengthens the fixation of the electrode terminal 213, and improves the heat dissipation of the electrode terminal 213.

[0088] In an embodiment, the first connecting member 70 covers the part of the electrode terminal 213 extending out of the cell case 211 and at least part of the first sealing part 2115, strengthens the protection of the first sealing part 2115, and improves the heat dissipation of the cell case 211.

[0089] In an embodiment, the electrode assembly 212 comprises a jelly-roll structure formed by winding the positive electrode sheet, the negative electrode sheet and the separator film. In other embodiments, the electrode assembly 212 can also be a stack structure, i.e., the positive electrode sheet, the separator film and the negative electrode sheet are sequentially stacked to form an electrode assembly 212 unit, and multiple electrode assembly 212 units are stacked to form the electrode assembly 212. Optionally, the battery cell shell 211 comprises an aluminum plastic film. Optionally, the battery cell 21 comprises a soft package battery cell.

[0090] In an embodiment, the electrode terminal 213 has a welding portion 213a extending out of the battery cell shell 211, and the welding portion 213a is formed by bending the electrode terminal 213. The electrode terminals 213 of adjacent battery cells 21 are bent towards each other through the first circuit board 30 and connected to the first circuit board 30. In an embodiment, the electrode terminal 213 comprises a first terminal 213b and a second terminal 213c, the first terminal 213b and the second terminal 213c are opposite in polarity, one of the first terminal 213b and the second terminal 213c is a positive electrode terminal, and the other is a negative electrode terminal. In the first direction X, the projection of the welding portion 213a of the first terminal 213b of the battery cell 21 at least partially overlaps the projection of the welding portion 213a of the second terminal 213c of the adjacent battery cell 21. The first terminal 213b and the second terminal 213c of the adjacent battery cell 21 are bent towards each other, and the welding portion 213a of the first terminal 213b and the welding portion 213a of the second terminal 213c are stacked and connected to each other. By connecting the welding portions 213a of the adjacent battery cells 21 to each other and connecting the welding portions 213a to the first circuit board 30, the processing steps are reduced.

[0091] In other embodiments, in the first direction X, the projection of the first terminal 213b of the battery cell 21 can also at least partially overlap the projection of the first terminal 213b of the adjacent battery cell 21, and be connected through the first circuit board 30 to realize the parallel connection between the battery cells 21.

[0092] In an embodiment, the battery cell assembly 20 comprises a plurality of battery cells 21 stacked in the third direction Z. Optionally, the battery cell assembly 20 comprises a plurality of battery cells 21, part of the battery cells 21 are stacked in the third direction Z as a first column of battery cells 21a, part of the battery cells 21 are stacked in the third direction Z as a second column of battery cells 21b, and the second column of battery cells 21b is arranged along the second direction Y with the first column of battery cells 21a.

[0093] In an embodiment, the battery cell assembly 20 comprises a plurality of battery cells 21 stacked in the third direction Z.

[0094] In an embodiment, the battery cell 21 is in contact with the first shell 11, and the heat of the battery cell 21 is dissipated to the external environment through the first shell 11.

[0095] Please refer toFigure 11 In an embodiment, the battery cell assembly 20 further comprises a plurality of heat dissipation parts 22, the heat dissipation parts 22 contact the battery cells 21 to dissipate heat of the battery cells 21. Optionally, the heat dissipation parts 22 contact the first housing 11 to transfer heat of the battery cells 21 to the first housing 11 to dissipate heat of the battery cells 21 through the first housing 11. Optionally, the heat dissipation parts 22 comprise aluminum shells.

[0096] In an embodiment, the projection of the heat dissipation parts 22 overlaps the projection of the battery cell shells 211 along the first direction X, the projection of the heat dissipation parts 22 overlaps the projection of the battery cell shells 211 along the second direction Y, and the projection of the heat dissipation parts 22 overlaps the projection of the battery cell shells 211 along the third direction Z, to increase the contact area between the heat dissipation parts 22 and the battery cell shells 211 and improve the heat dissipation efficiency.

[0097] In an embodiment, a first elastic member 221a is arranged between adjacent heat dissipation parts 22, and a gap is arranged between adjacent battery cells 21, to increase the width of the adjacent battery cells 21 along the third direction Z, facilitate injection of the first connecting member 70, and improve the efficiency of injection of the first connecting member 70. Optionally, the first elastic member 221a comprises foam.

[0098] Please refer to Figure 10 and Figure 12 In an embodiment, the first circuit board 30 is provided with a plurality of groups of holes 31, each group of holes 31 comprising a first hole 311 and a second hole 312 arranged along the third direction Z. The first terminal 213b of an adjacent battery cell 21 passes through the first hole 311, and the second terminal 213c of another battery cell 21 passes through the second hole 312. The welding part 213a of the first terminal 213b and the welding part 213a of the second terminal 213c are stacked and connected to the first circuit board 30. Optionally, the first circuit board 30 comprises a flexible printed circuit (FPC). Optionally, the first circuit board 30 comprises a printed circuit board (PCB). The first circuit board 30 can collect information of the electrode terminals 213, such as voltage, current, and the like, and transmit the information to the second circuit board 13.

[0099] In an embodiment, the first circuit board 30 is provided with a plurality of first conductive pieces 32 connecting the first circuit board 30. Optionally, the first conductive pieces 32 can be copper foils provided on the first circuit board 30, the copper foils being connected with wirings on the first circuit board 30. Optionally, the first conductive pieces 32 can be conductive pieces such as copper bars provided on the first circuit board 30, the conductive pieces being welded to the first circuit board 30. As viewed in the direction X' opposite to the first direction X, the first conductive pieces 32 are located between the first holes 311 and the second holes 312, the first terminals 213b of the adjacent battery cells 21 passing through the first holes 311, the second terminals 213c of the other battery cells 21 passing through the second holes 312, the welding portions 213a of the first terminals 213b and the welding portions 213a of the second terminals 213c being stacked and welded to the first conductive pieces 32, the first conductive pieces 32, the welding portions 213a of the first terminals 213b and the welding portions 213a of the second terminals 213c being stacked in the first direction X, the heat conduction members 50 being connected to the sides of the welding portions 213a away from the first conductive pieces 32. The welding includes laser welding, ultrasonic welding, etc. In other embodiments, the welding portions 213a and the first conductive pieces 32 can also be connected by other connection manners such as conductive glue.

[0100] In an embodiment, each welding portion 213a includes two first ends 2131 arranged in the second direction Y, each first conductive piece 32 includes a second end 321 arranged in the second direction Y, as viewed in the direction X' opposite to the first direction X, the two first ends 2131 are located between the two second ends 321 in the second direction Y.

[0101] In an embodiment, each group of holes 31 further includes third holes 313, the third holes 313 penetrating through the first circuit board 30 in the first direction X. Some of the third holes 313 are arranged in the second direction Y, and some of the third holes 313 are arranged in the third direction Z. Optionally, at least one third hole 313 is configured to allow the first connecting members 70 to flow between the heat conduction members 50 and the first circuit board 30, and at least part of the first connecting members 70 are located in the at least one third hole 313. Optionally, all of the third holes 313 are configured to allow the first connecting members 70 to flow between the heat conduction members 50 and the first circuit board 30, and at least part of the first connecting members 70 are arranged in the third holes 313, thereby improving heat dissipation.

[0102] In an embodiment, as viewed in the direction X' opposite to the first direction X, the third holes 313 are located in the first openings 40a, and the third holes 313 are spaced apart from the first conductive pieces 32, thereby further improving heat dissipation. In an embodiment, the first circuit board 30 is further provided with a second conductive sheet 33 and a third conductive sheet 34. In the third direction Z, the electrode terminal 213 of one of the two outermost cells 21 in the first column of cells 21a is connected to the third conductive sheet 34, and the electrode terminal 213 of the other of the two outermost cells 21 is connected to the second conductive sheet 33.

[0103] In an embodiment, the first circuit board 30 is further provided with a fourth conductive sheet 35. In the third direction Z, the electrode terminal 213 of one of the two outermost cells 21 in the second column of cells 21b is connected to the third conductive sheet 34, and the electrode terminal 213 of the other of the two outermost cells 21 is connected to the fourth conductive sheet 35. The third conductive sheet 34 is connected to the electrode terminals 213 of the two cells 21 arranged in the second direction Y, for transmitting current from the first column of cells 21a to the second column of cells 21b, and realizing series connection or parallel connection between the first column of cells 21a and the second column of cells 21b. Optionally, in the first direction X, the thickness of the second conductive sheet 33, the thickness of the third conductive sheet 34, and the thickness of the fourth conductive sheet 35 are all greater than the thickness of the first conductive sheet 32. By increasing the thickness of the second conductive sheet 33, the third conductive sheet 34, and the fourth conductive sheet 35, the transmission of current can be increased.

[0104] In an embodiment, the first circuit board 30 is further provided with a plurality of fourth holes 36, which are arranged at the middle position of the first circuit board 30 in the second direction Y. The battery pack 100 further comprises a sampling harness 100a, which is connected to the first circuit board 30 through the plurality of fourth holes 36.

[0105] In an embodiment, the battery pack 100 further comprises a first electrical connection part 100b and a second electrical connection part 100c, which are used for input or output of electrical energy. Optionally, the first electrical connection part 100b and the second electrical connection part 100c are welded to the first circuit board 30. Optionally, the first electrical connection part 100b is connected to one of the first terminal 213b and the second terminal 213c, and the second electrical connection part 100c is connected to the other. Optionally, the first electrical connection part 100b and the second electrical connection part 100c comprise copper bars.

[0106] In an embodiment, the first electric connection part 100b comprises a first conductive part 110 and a first insulating part 120. The first insulating part 120 is sleeved on the first conductive part 110, and both ends of the first conductive part 110 protrude out of the first insulating part 120. Optionally, one end of the first conductive part 110 protruding out of the first insulating part 120 is connected to the second conductive sheet 33, and the other end passes through the support 40 and the heat sink 60 and is connected to the first connection part 131 of the second circuit board 13. Optionally, one end of the first conductive part 110 protruding out of the first insulating part 120 is directly connected to the first circuit board 30, and the other end passes through the support 40 and the heat sink 60 and is connected to the first connection part 131 of the second circuit board 13.

[0107] In an embodiment, the second electric connection part 100c comprises a second conductive part 130 and a second insulating part 140. The second insulating part 140 is sleeved on the second conductive part 130, and both ends of the second conductive part 130 protrude out of the second insulating part 140. Optionally, one end of the second conductive part 130 protruding out of the second insulating part 140 is connected to the fourth conductive sheet 35, and the other end passes through the support 40 and the heat sink 60 and is connected to the first connection part 131 of the second circuit board 13. Optionally, one end of the second conductive part 130 protruding out of the second insulating part 140 is directly connected to the first circuit board 30, and the other end passes through the support 40 and the heat sink 60 and is connected to the second connection part 132 of the second circuit board 13.

[0108] Please refer to Figure 9 , Figure 10 and Figures 13 to 16 In an embodiment, the support 40 comprises a support body 41, and the support body 41 covers part of the first circuit board 30 and insulates the first circuit board 30. A first connecting piece 70 is arranged between the support body 41 and the first circuit board 30, and the support 40 and the first circuit board 30 are connected through the first connecting piece 70. The first connecting piece 70 can further insulate the first circuit board 30.

[0109] Optionally, the support 40 is made of insulating material. Optionally, the support 40 is made of metal material and insulating material, and the insulating material can cover the outer surface of the metal material.

[0110] In an embodiment, along the first direction X, the first opening 40a penetrates through the support body 41. At least part of the solder part 213a is exposed to the first opening 40a when viewed in the direction opposite to the first direction X. The heat conduction piece 50 is arranged in the first opening 40a, and along the first direction X, the projection of the heat conduction piece 50 overlaps with the projection of the first opening 40a, and the heat conduction piece 50 is connected to the solder part 213a exposed from the first opening 40a. Along the first direction X, the first conductive sheet 32, the solder part 213a and the heat conduction piece 50 are sequentially arranged. Optionally, the heat conduction piece 50 covers the solder part 213a exposed from the first opening 40a.

[0111] Optionally, at least part of the soldering portions 213a on the plurality of first conductive sheets 32 spaced apart along the third direction Z are exposed to the same first opening 40a when viewed in the direction opposite to the first direction X. Along the first direction X, the heat conduction member 50 is coincident with the first opening 40a and connects the plurality of soldering portions 213a exposed from the first opening 40a.

[0112] Optionally, the support body 41 is provided with a plurality of first openings 40a spaced apart along the second direction Y. Each first opening 40a is provided with a heat conduction member 50, and each heat conduction member 50 connects the side of the soldering portion 213a away from the first conductive sheet 32.

[0113] In an embodiment, along the second direction Y, the first opening 40a includes two first edges 401. When viewed in the direction opposite to the first direction X, along the second direction Y, the two first edges 401 are located between the two first ends 2131, and the side end of the soldering portion 213a is away from the first opening 40a, reducing the possibility of burrs of the soldering portion 213a piercing the heat conduction member 50. When viewed in the direction opposite to the first direction X, along the second direction Y, the two first edges 401 are located between the two second ends 321, and the side end of the first conductive sheet 32 is away from the first opening 40a, reducing the possibility of burrs of the first conductive sheet 32 piercing the heat conduction member 50.

[0114] In an embodiment, the heat conduction member 50 includes a first surface 50a and a second surface 50b oppositely arranged along the first direction X. The first surface 50a protrudes out of the first opening 40a in the direction opposite to the first direction X, facilitating the first surface 50a connecting the soldering portion 213a, and the second surface 50b protrudes out of the first opening 40a along the first direction X, facilitating the second surface 50b connecting the heat sink 60. The heat of the electrode terminal 213 is conducted to the second surface 50b through the first surface 50a, and is conducted to the heat sink 60 through the second surface 50b, which is conducive to conducting the heat of the electrode terminal 213. Optionally, the first surface 50a is in contact with the electrode terminal 213, and the second surface 50b is in contact with the heat sink 60. Optionally, the first surface 50a is connected to the electrode terminal 213 through a heat-conducting glue, and the second surface 50b is connected to the heat sink 60 through a heat-conducting glue. Optionally, the heat conduction member 50 includes a heat-conducting silica gel pad. Optionally, the heat conduction member 50 can be compressed, and the heat conduction member 50 is in a compressed state, which is conducive to further improving heat dissipation.

[0115] Optionally, the thermal conductivity of the thermal conductive member 50 is higher than the thermal conductivity of the first connecting member 70, so as to improve the thermal conduction effect of the thermal conductive member 50. The thermal conductivity of the thermal conductive member 50 is D, where 4 W / (m·K)≤D≤6 W / (m·K). The thermal conductivity D satisfies any one of 4 W / (m·K), 4.1 W / (m·K), 4.2 W / (m·K), 4.3 W / (m·K), 4.4 W / (m·K), 4.5 W / (m·K), 4.6 W / (m·K), 4.7 W / (m·K), 4.8 W / (m·K), 4.9 W / (m·K), 5.0 W / (m·K), 5.1 W / (m·K), 5.2 W / (m·K), 5.3 W / (m·K), 5.4 W / (m·K), 5.5 W / (m·K), 5.6 W / (m·K), 5.7 W / (m·K), 5.8 W / (m·K), 5.9 W / (m·K), or 6.0 W / (m·K).

[0116] In an embodiment, the bracket 40 is provided with a second opening 42, which penetrates the bracket body 41 along the first direction X. The first electrical connecting part 100b extends to the side of the bracket 40 away from the first circuit board 30 after penetrating the second opening 42. Optionally, the bracket 40 is provided with a first protrusion 402, which is arranged at the edge of the second opening 42 and is used to position the first electrical connecting part 100b. Along the second direction Y, the projection of the part of the first conductive part 110 extending out of the first insulating part 120 is located within the projection of the first protrusion 402. The first protrusion 402 is used to insulate the part of the first conductive part 110 extending out of the first insulating part 120, so as to reduce the risk of short circuit of the part of the first conductive part 110 extending out of the first insulating part 120. Optionally, along the second direction Y, the projection of the first insulating part 120 overlaps with the projection of the first protrusion 402, so as to increase the length of the first protrusion 402 along the first direction X and further improve the insulation of the part of the first conductive part 110 extending out of the first insulating part 120.

[0117] In an embodiment, the bracket 40 is provided with a third opening 43, which penetrates the bracket body 41 along the first direction X. The second electrical connection part 100c extends to the side of the bracket 40 away from the first circuit board 30 after passing through the third opening 43. Optionally, the bracket 40 is provided with a second protrusion 403, which is arranged at the edge of the third opening 43. The second protrusion 403 is used for positioning and insulating the second electrical connection part 100c. Along the second direction Y, the projection of the part of the second conductive part 130 extending out of the second insulating part 140 is located within the projection of the second protrusion 403. The second protrusion 403 is used for insulating the part of the second conductive part 130 extending out of the second insulating part 140, which reduces the risk of short circuit of the part of the second conductive part 130 extending out of the second insulating part 140. Optionally, along the second direction Y, the projection of the second insulating part 140 overlaps with the projection of the second protrusion 403, which increases the length of the second protrusion 403 along the first direction X, and further improves the insulation of the part of the second conductive part 130 extending out of the second insulating part 140.

[0118] In an embodiment, the bracket 40 is provided with a fourth opening 45, which penetrates the bracket body 41 along the first direction X, for the sampling wire harness 100a to pass through. Along the second direction Y, the fourth opening 45 is located at the middle position of the bracket body 41. Along the third direction Z, the fourth opening 45 is provided with two guide plates 451 on both sides, and the sampling wire harness 100a passes through the fourth opening 45 between the two guide plates 451, which facilitates the positioning and guiding of the sampling wire harness 100a.

[0119] Please refer to Figure 3 、 Figure 13 、 Figure 14 、 Figures 18 to 20 In an embodiment, the bracket 40 includes a first protrusion 46, which is arranged at the side of the bracket body 41 facing the heat sink 60 along the first direction X. The first protrusion 46 connects the heat sink 60, so that the bracket body 41 and the heat sink 60 have a first gap 40b therebetween. The first connecting piece 70 is arranged in the first gap 40b to connect the bracket 40 and the heat sink 60, and to seal and insulate the space between the bracket 40 and the heat sink 60.

[0120] In an embodiment, the bracket 40 includes a second protrusion 47, which is arranged at the side of the bracket body 41 facing the first circuit board 30 along the direction opposite to the first direction X. The second protrusion 47 connects the first circuit board 30, so that the bracket body 41 and the first circuit board 30 have a second gap 40c therebetween. The first connecting piece 70 is arranged in the second gap 40c to connect the bracket 40 and the second gap 40c, and to seal and insulate the space between the bracket 40 and the second gap 40c.

[0121] In an embodiment, the bracket 40 comprises a first through hole 48 penetrating the bracket body 41 along the first direction X. The first through hole 48 is configured to allow the first connecting member 70 to flow into the first gap 40b, and at least part of the first connecting member 70 is arranged in the first through hole 48. Optionally, a plurality of first through holes 48 are arranged along the third direction Z, which is beneficial to improve the injection efficiency of the first connecting member 70. Optionally, at least one first through hole 48 is configured to allow the first connecting member 70 to flow into the first gap 40b, and the first connecting member 70 is arranged in the at least one first through hole 48. Optionally, a plurality of first through holes 48 are configured to allow the first connecting member 70 to flow into the first gap 40b, and at least part of the first connecting member 70 is arranged in the plurality of first through holes 48.

[0122] In an embodiment, part of the at least one electrode terminal 213 is located in the first through hole 48 as viewed along the direction X' opposite to the first direction X, which further improves the heat dissipation of the electrode terminal 213.

[0123] In an embodiment, part of the at least one first conductive sheet 32 is located in the first through hole 48 as viewed along the direction X' opposite to the first direction X, which further improves the heat dissipation of the first conductive sheet 32.

[0124] In an embodiment, the bracket 40 comprises a plurality of second through holes 49 penetrating the bracket body 41 along the first direction X. Optionally, at least one second through hole 49 is arranged with the first connecting member 70. Optionally, a plurality of second through holes 49 are arranged with the first connecting member 70.

[0125] Optionally, the projection of the second through hole 49 overlaps with the projection of the second conductive sheet 33 along the first direction X, i.e., part of the second conductive sheet 33 is located in the second through hole 49 as viewed along the direction opposite to the first direction X, and the projection of the second through hole 49 overlaps with the projection of the soldering part 213a of the electrode terminal 213 connected to the second conductive sheet 33, i.e., part of the soldering part 213a connected to the second conductive sheet 33 is located in the second through hole 49 as viewed along the direction opposite to the first direction X. Through the first connecting member 70 in the second through hole 49, the heat of the electrode terminal 213 connected to the second conductive sheet 33 and the heat of the second conductive sheet 33 are conducted to the heat sink 60, which is beneficial to heat dissipation.

[0126] Optionally, along the first direction X, the projection of the second through hole 49 overlaps with the projection of the third conductive sheet 34, that is, along the direction opposite to the first direction X, part of the third conductive sheet 34 is located in the second through hole 49, and the projection of the second through hole 49 overlaps with the projection of the welding part 213a of the electrode terminal 213 connected with the third conductive sheet 34, that is, along the direction opposite to the first direction X, part of the welding part 213a connected with the third conductive sheet 34 is located in the second through hole 49. Through the first connecting piece 70 in the second through hole 49, the heat of the electrode terminal 213 connected with the third conductive sheet 34 and the heat of the third conductive sheet 34 are conducted to the heat sink 60, which is conducive to heat dissipation.

[0127] Optionally, along the first direction X, the projection of the second through hole 49 overlaps with the projection of the fourth conductive sheet 35, that is, along the direction opposite to the first direction X, part of the fourth conductive sheet 35 is located in the second through hole 49, and the projection of the second through hole 49 overlaps with the projection of the welding part 213a of the electrode terminal 213 connected with the fourth conductive sheet 35, that is, along the direction opposite to the first direction X, part of the welding part 213a connected with the fourth conductive sheet 35 is located in the second through hole 49. Through the first connecting piece 70 in the second through hole 49, the heat of the electrode terminal 213 connected with the fourth conductive sheet 35 and the heat of the fourth conductive sheet 35 are conducted to the heat sink 60, which is conducive to heat dissipation.

[0128] In an embodiment, the bracket 40 includes a third protrusion 40d. The bracket body 41 includes a first side edge 411 and a second side edge 412 arranged along a third direction Z. Optionally, the first side edge 411 is provided with the third protrusion 40d. Along the third direction Z, the projection of the third protrusion 40d overlaps with the projection of the first circuit board 30, and the position of the bracket 40 connected with the first circuit board 30 is limited through the third protrusion 40d, which facilitates assembly. Optionally, along the third direction Z, the projection of the first circuit board 30 is located in the projection of the third protrusion 40d. Optionally, along the third direction Z, the projection of the third protrusion 40d overlaps with the projection of the electrode terminal 213 and the electrode terminal 213, and the electrode terminal 213 can be insulated. Optionally, along the third direction Z, the projection of the welding part 213a is located in the projection of the third protrusion 40d, which further enhances insulation.

[0129] Optionally, the second side 412 is provided with a third protrusion 40d, and a projection of the third protrusion 40d overlaps with a projection of the first circuit board 30 in the third direction Z. The third protrusion 40d further limits the position of the bracket 40 connected to the first circuit board 30, facilitating assembly. Optionally, in the third direction Z, the projection of the first circuit board 30 is located within the projection of the third protrusion 40d. Optionally, in the third direction Z, the projection of the third protrusion 40d overlaps with the projections of the cell shell 211 and the electrode terminal 213, further insulating the electrode terminal 213. Optionally, in the third direction Z, the projection of the welding portion 213a is located within the projection of the third protrusion 40d, further strengthening insulation.

[0130] Please refer to Figure 3 、 Figure 9 、 Figure 10 and Figure 17 In an embodiment, the heat sink 60 has a plurality of first channels 60a arranged in the second direction Y. The heat sink 60 is provided with a first containing space 61. Optionally, one of the two outermost first channels 60a arranged in the second direction Y is in communication with the first containing space 61. Optionally, the heat sink 60 is provided with a second containing space 62, and the second containing space 62 is in communication with the other first channel 60a located at the outermost side.

[0131] In an embodiment, the heat sink 60 has a higher thermal conductivity than the thermal conduction member 50, which is conducive to improving heat dissipation of the battery pack 100.

[0132] In an embodiment, when the bracket 40 is connected to the heat sink 60, the first protrusion 402 is arranged in the first containing space 61, and a projection of the first protrusion 402 is located within a projection of the first containing space 61 in the first direction X. The first electrical connection portion 100b passes through the first containing space 61. Optionally, the heat sink 60 is provided with a third containing space 63, and the sampling wire harness 100a passes through the third containing space 63.

[0133] In an embodiment, the first containing space 61 is provided with a second insulating member 80 for sealing the first containing space 61, which limits the outflow of the first insulating material from the first containing space 61 when the first insulating material is injected. Optionally, the second insulating member 80 is configured to be formed by solidifying the second insulating material after being arranged in the first containing space 61. Optionally, the second insulating member 80 includes one of polyurethane glue, epoxy glue, and silicone glue. Optionally, the second insulating member 80 includes foaming glue. The first protrusion 402 is arranged in the first containing space 61, which further limits the flow of the second insulating material and reduces the inflow of the second insulating material between the bracket 40 and the first circuit board 30 from the second opening 42. In the first direction X, the second insulating member 80 protrudes out of the heat sink 60.

[0134] In an embodiment, the second accommodating space 62 is provided with a third insulation member 81 configured to seal the second accommodating space 62 and limit the flow of the first insulation material out of the second accommodating space 62 when the first insulation material is injected. Optionally, the third insulation member 81 is configured to fix the solidifiable third insulation material in the second accommodating space 62 and solidify to form. Optionally, the third insulation member 81 comprises one of polyurethane glue, epoxy glue, and silicone glue. Optionally, the third insulation member 81 comprises foaming glue. The second protrusion 403 is arranged in the second accommodating space 62, which can further limit the flow of the third insulation material and reduce the flow of the third insulation material from the third opening 43 into the space between the heat sink 60 and the first circuit board 30. The third insulation member 81 protrudes out of the heat sink 60 in the first direction X.

[0135] In an embodiment, the third accommodating space 63 is provided with a fourth insulation member 82 configured to seal the third accommodating space 63 and limit the flow of the first insulation material out of the third accommodating space 63 when the first insulation material is injected. Optionally, the fourth insulation member 82 is configured to fix the solidifiable fourth insulation material in the third accommodating space 63 and solidify to form. Optionally, the fourth insulation member 82 comprises one of polyurethane glue, epoxy glue, and silicone glue. Optionally, the fourth insulation member 82 comprises foaming glue. The fourth insulation member 82 protrudes out of the heat sink 60 in the first direction X.

[0136] In an embodiment, the outermost two first channels 60a arranged in the second direction Y are provided with fourth protrusions 64, which contact and fix the first protrusions 402, thereby positioning the first electrical connection portions 100b and reserving space for injecting the second insulation member 80.

[0137] In an embodiment, the outer surface of the heat sink 60 comprises a metal material layer, such as aluminum, which is beneficial for heat dissipation. Optionally, the heat sink 60 is made of a metal material, and the outer surface of the heat sink 60 can be coated with an insulation layer. Optionally, the heat sink 60 is made of a metal material, and the outer surface of the heat sink 60 comprises a metal material layer.

[0138] In an embodiment, when pouring the first insulating material upside down, first, the battery cell 21, the first circuit board 30, the support 40, the heat conducting member 50, and the heat sink 60 are installed in the first housing 11, and the heat sink 60 is connected to the first housing 11, then the second insulating material is poured into the first accommodating space 61, the third insulating material is poured into the second accommodating space 62, and the fourth insulating material is poured into the third accommodating space 63, after the second, third, and fourth insulating materials are solidified, the heat sink 60 is closed, then the first housing 11 is inverted, the flowing first insulating material is poured into the battery pack 100 along the first direction X from the bottom of the battery cell assembly 20, after the first insulating material is solidified, the first connecting member 70 is formed, then the bottom wall 115 and the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114 are connected and fixed.

[0139] Please refer to Figure 20 The application also provides a power consuming device 200 using the above battery pack 100. In an embodiment, the power consuming device 200 of the application can be, but is not limited to, a drone, a backup power supply, an electric vehicle, an electric motorcycle, an electric power-assisted bicycle, an electric tool, a household large storage battery, etc.

[0140] Those skilled in the art should recognize that the above embodiments are only used to illustrate the application, and are not used as a limitation to the application, and as long as the above embodiments are within the spirit and scope of the application, any suitable changes and variations to the above embodiments are within the scope of the application.

Claims

1. A battery pack, characterized in that, include: Housing assembly; A battery cell assembly is housed within the housing assembly. The battery cell assembly includes a plurality of battery cells, each of the battery cells including a battery cell housing, an electrode assembly disposed within the battery cell housing, and an electrode terminal connected to the electrode assembly and extending out of the battery cell housing. The electrode terminal has a weld portion extending out of the battery cell housing. A first circuit board is disposed within the housing assembly and connected to the battery cell assembly. The first circuit board is provided with a plurality of first conductive sheets, and the first conductive sheets are connected to the first circuit board. A bracket, wherein the first circuit board is disposed between the cell housing and the bracket, and the bracket has a first opening; The electrode terminal connected to the first conductive sheet includes two first ends disposed along a second direction, and the first opening includes two first edges disposed along the second direction. When viewed from a direction opposite to the first direction, along the second direction, the two first edges are located between the two first ends, and the second direction is perpendicular to the first direction. A heat-conducting component is disposed at the first opening and connected to the welding part.

2. The battery pack as described in claim 1, characterized in that, The battery pack includes a heat sink, which is located on the side of the bracket away from the first circuit board. The heat-conducting component includes a first surface and a second surface disposed opposite to each other along the first direction, the first surface being connected to the welding part and the second surface being connected to the heat sink.

3. The battery pack as described in claim 2, characterized in that, The electrode terminals of adjacent battery cells pass through the first circuit board and are stacked with the first conductive sheet. The heat-conducting component connects the side of the electrode terminals away from the first conductive sheet.

4. The battery pack as described in claim 2 or 3, characterized in that, The first surface protrudes from the first opening in a direction opposite to the first direction, and the second surface protrudes from the first opening in the first direction and is connected to the heat sink.

5. The battery pack according to any one of claims 2 to 4, characterized in that, The battery pack includes a first connector, which is partially disposed between the first circuit board and the bracket, and the bracket and the first circuit board are connected through the first connector.

6. The battery pack as described in claim 5, characterized in that, The first connector is located between the bracket and the heat sink, and the bracket and the heat sink are bonded together by the first connector.

7. The battery pack as described in any one of claims 5 or 6, characterized in that, The first connector is configured to be formed by applying a flowing first insulating material to the battery pack and then curing it. Preferably, the first connector includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive, or the first connector includes expanding foam.

8. The battery pack according to any one of claims 5 to 7, characterized in that, The thermal conductivity of the heat-conducting component is greater than that of the first connector. Preferably, the thermal conductivity D of the heat-conducting component satisfies 4W / (m·K)≤D≤6W / (m·K). Preferably, the thermal conductivity of the first connector is A, where 0.8W / (m·K)<A≤3.0W / (m·K).

9. The battery pack according to any one of claims 2 to 8, characterized in that, The housing assembly has a first opening and a second opening, and the heat sink has a first channel that connects the first opening and the second opening.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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