Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device with the battery pack. The battery pack comprises a shell assembly, a cell assembly, a first circuit board, a first connecting piece, a wire harness assembly and a first adhesive. The cell assembly is accommodated in the shell assembly. The cell assembly comprises a plurality of cells, each of which comprises a cell shell, an electrode assembly arranged in the cell shell and an electrode terminal connected with the electrode assembly and extending out of the cell shell. The first circuit board is connected with the electrode terminal. The first circuit board and the cell assembly are arranged along a first direction. The first connecting piece is arranged on a side of the first circuit board away from the cell shell. The first connecting piece and the first circuit board form an accommodation space. The wire harness assembly comprises a connecting part and a plurality of wires. The connecting part is connected with the first circuit board. Each wire comprises a first segment arranged in the accommodation space and a second segment extending out of the accommodation space. The connecting part is located in the accommodation space as viewed along the first direction. The first adhesive is filled in the accommodation space, thereby reducing the risk of short circuit of the battery pack.

Description

Technical Field

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

[0002] Battery packs are currently widely used in drones, electric vehicles, and smart energy storage devices. They are connected to circuit boards via wiring harnesses, which collect information about the battery pack for easy management. If external liquid enters the battery pack, it can easily flow through the gaps between the wiring harnesses to the connection point between the harness and the circuit board, causing a short circuit. Summary of the Invention

[0003] In view of this, it is necessary to provide a battery pack and electrical equipment that can reduce the risk of battery pack short circuit.

[0004] This application provides a battery pack including a housing assembly, a cell assembly, a first circuit board, a first connector, a wiring harness assembly, and a first adhesive. The cell assembly is housed within the housing assembly. The cell assembly includes multiple cells, each cell including a cell housing, an electrode assembly disposed within the cell housing, and electrode terminals connecting to the electrode assembly and extending out of the cell housing. The first circuit board connects to the electrode terminals. The first circuit board and the cell assembly are arranged along a first direction. The first connector is disposed on the side of the first circuit board opposite to the cell housing. The first connector and the first circuit board form a receiving space. The wiring harness assembly includes a connecting portion and multiple wires connected to the connecting portion. The connecting portion connects to the first circuit board. Each wire includes a first segment disposed within the receiving space and a second segment extending out of the receiving space. Viewed along the first direction, the connecting portion is located within the receiving space. The first adhesive fills the receiving space, providing insulation and waterproofing protection for the first segment, the connecting portion, and the covered portion of the first circuit board within the receiving space, reducing the risk of short circuits in the battery pack.

[0005] Optionally, in some embodiments of this application, the first adhesive at least partially covers the connection between the connector and the first circuit board, providing insulation and waterproof protection for the connection between the connector and the first circuit board, thereby reducing the risk of short circuit in the battery pack.

[0006] Optionally, in some embodiments of this application, a first adhesive is disposed in the gap between the first connector and the wiring harness assembly and in the gap between the first segments to provide insulation and waterproof protection for the connection position between the connector and the first circuit board. By disposing of the first adhesive in the gap between adjacent first segments, the adjacent first segments are bonded together, and other impurities are prevented from flowing from the gap between the first segments to the connection position between the connector and the first circuit board, thereby reducing the risk of short circuit in the battery pack.

[0007] Optionally, in some embodiments of this application, when viewed along a first direction, the first connector surrounds the connecting portion, reducing the overflow of the first adhesive from the main body portion.

[0008] Optionally, in some embodiments of this application, the first connector includes a main body. The main body includes a first connecting wall and a second connecting wall disposed along a third direction, and a third connecting wall and a fourth connecting wall disposed along a second direction. The first connecting wall connects the third connecting wall and the fourth connecting wall, and the second connecting wall connects the third connecting wall and the fourth connecting wall. The first connecting wall, the second connecting wall, the third connecting wall, and the fourth connecting wall connect the first circuit board, and the third direction is perpendicular to both the first and second directions. By surrounding the connector with the first connecting wall, the second connecting wall, the third connecting wall, and the fourth connecting wall, the overflow of the first adhesive from the main body is reduced.

[0009] Optionally, in some embodiments of this application, the main body is provided with a first opening. The first opening communicates with the receiving space. The second segment extends out of the receiving space through the first opening, which facilitates the extension of the second segment and the injection of the first adhesive.

[0010] Optionally, in some embodiments of this application, the first circuit board is provided with a second connecting hole. The first connector is provided with a connecting post. The connecting post is located in the second connecting hole. The first connector is positioned and fixed by the connecting post and the second connecting hole, which facilitates the installation of the first connector.

[0011] Optionally, in some embodiments of this application, the battery pack includes an adhesive member. The first connector includes a first end face. The first end face is bonded to the first circuit board via the adhesive member, restricting the flow of the first adhesive outside the receiving space.

[0012] Optionally, in some embodiments of this application, the first connector includes a third extension. The third extension connects to the first end face. An adhesive is disposed on the first end face and the third extension, increasing the area of ​​the adhesive and thus increasing the area of ​​connection between the adhesive and the first circuit board, thereby improving the connection strength between the first connector and the first circuit board.

[0013] Optionally, in some embodiments of this application, the adhesive is disposed on the first circuit board. When the first connector is connected to the first circuit board, the adhesive is bonded to the first connector to fix the position of the first connector.

[0014] Optionally, in some embodiments of this application, a heat sink is also included. The heat sink has a first receiving space. The first receiving space extends through the heat sink in a first direction. A portion of the first connector is disposed in the first receiving space. Multiple wires extend out of the first receiving space, providing insulation protection for the main body through the first receiving space.

[0015] Optionally, in some embodiments of this application, the heat sink includes a second receiving space that extends through the heat sink along a first direction. The battery pack also includes a third adhesive. The third adhesive is disposed in the second receiving space. The third adhesive protrudes from the surface of the heat sink, reducing the possibility of liquid entering the second receiving space.

[0016] Optionally, in some embodiments of this application, the heat sink includes a third receiving space. The third receiving space extends through the heat sink along a first direction. The battery pack also includes a fourth adhesive. The fourth adhesive is disposed in the third receiving space and protrudes from the surface of the heat sink, reducing the possibility of liquid entering the third receiving space.

[0017] Optionally, in some embodiments of this application, the battery pack further includes an insulating support. The insulating support is disposed between the first circuit board and the heat sink. The insulating support has a third opening. The third opening extends through the insulating support along a first direction. A first connector passes through the third opening. The insulating support provides insulation between the first circuit board and the heat sink.

[0018] Optionally, in some embodiments of this application, a second adhesive is also included. The second adhesive fills the receiving space and the first receiving space. The second adhesive also bonds to the first adhesive to seal and insulate the receiving space, reducing the possibility of liquid entering the first receiving space and from the first receiving space into the connection between the wire harness assembly and the first circuit board, thereby reducing the risk of short circuit.

[0019] Optionally, in some embodiments of this application, at least a portion of the second adhesive is disposed in the first accommodating space. The second adhesive, disposed in the gap between the first connector and the first accommodating space, and in the gap between the multiple wires and the heat sink, further prevents liquid from entering the first accommodating space, reducing the risk of short circuits.

[0020] Optionally, in some embodiments of this application, the second adhesive protrudes from the surface of the heat sink away from the first circuit board, further preventing liquid from entering the first accommodating space 81 and reducing the risk of short circuit.

[0021] Optionally, in some embodiments of this application, the portion of the second adhesive protruding from the heat sink has an inclined surface. By providing an inclined surface, the accumulation of liquid on the surface of the second adhesive is reduced, which further reduces the possibility of liquid entering the connection between the wiring harness assembly and the first circuit board, and further reduces the risk of short circuit.

[0022] Optionally, in some embodiments of this application, the viscosity of the first adhesive is less than that of the second adhesive, which facilitates the flow of the first adhesive to the gap between the first segments, thereby helping to prevent liquid from entering the containment space from the gap between the first segments and reducing the risk of short circuit.

[0023] Optionally, in some embodiments of this application, the first adhesive is configured to be formed by curing a flowing first insulating material disposed in an injection containment space.

[0024] Optionally, in some embodiments of this application, the second adhesive is configured to be formed by curing a flowing second insulating material disposed in a receiving space.

[0025] Optionally, in some embodiments of this application, a second circuit board is also included. A wiring harness assembly is connected to the second circuit board. The wiring harness assembly is configured to transmit information about the battery cell assembly to the second circuit board.

[0026] Optionally, in some embodiments of this application, the first circuit board has holes. Electrode terminals pass through the holes and are connected to the side of the first circuit board away from the battery cell housing. The first circuit board includes wires, wire connection connectors, and electrode terminals.

[0027] Optionally, in some embodiments of this application, the housing assembly includes a first housing. The first housing 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, thereby improving the heat dissipation of the battery pack.

[0028] Optionally, in some embodiments of this application, the battery pack further includes a first insulating member connected to the inner surface of the first housing. The first insulating member bonds and connects the cell assembly, the first circuit board, the insulating bracket and the heat sink, and seals and insulates the space between the cell assembly and the heat sink.

[0029] An embodiment of this application also provides an electrical device, including the battery pack in any of the above embodiments.

[0030] The aforementioned battery pack and electrical equipment are filled into the receiving space by the first adhesive, which provides insulation and waterproof protection for the first section, the connecting part and the covered part of the first circuit board in the receiving space, thereby reducing the risk of short circuit of the battery pack. Attached Figure Description

[0031] Figure 1 Schematic diagrams of the battery pack structure are shown in some embodiments.

[0032] Figure 2 A schematic diagram of the battery pack from another perspective is shown in some embodiments.

[0033] Figure 3 A structural schematic diagram of the battery pack from another perspective is shown in some embodiments.

[0034] Figure 4 An exploded schematic diagram of the battery pack is shown in some embodiments.

[0035] Figure 5A schematic diagram of the structure of a single cell is shown in some embodiments.

[0036] Figure 6 An exploded schematic diagram of a single cell is shown in some embodiments.

[0037] Figure 7 A schematic diagram of the structure of the first circuit board in some embodiments is shown.

[0038] Figure 8 Schematic diagrams of the wiring harness assembly and the first circuit board in some embodiments are shown.

[0039] Figure 9 Schematic diagrams of the wiring harness assembly, the first connector, and the first circuit board are shown in some embodiments.

[0040] Figure 10 A schematic diagram of a wiring harness assembly and a first connector mounted on a first circuit board is shown in some embodiments.

[0041] Figure 11 A schematic diagram of the structure of the first connector in some embodiments is shown.

[0042] Figure 12 A schematic diagram of the structure of the first connector from another perspective in some embodiments is shown.

[0043] Figure 13 An exploded schematic diagram of the first connector is shown in some embodiments.

[0044] Figure 14 A partial structural schematic diagram of the battery pack is shown in some embodiments.

[0045] Figure 15 It shows Figure 14 A breakdown diagram is shown in the image.

[0046] Figure 16 A partial structural schematic diagram of the battery pack from another perspective is shown in some embodiments.

[0047] Figure 17 Schematic diagrams of the heat sink in some embodiments are shown.

[0048] Figure 18 It shows Figure 1 The battery pack shown is a cross-sectional view along line II.

[0049] Figure 19 It shows Figure 16 Cross-sectional view along the middle section II-II.

[0050] Figure 20 It shows Figure 1 The battery pack shown is a cross-sectional view along line III-III.

[0051] Figure 21 It shows Figure 1 The diagram shows a cross-sectional view of the battery pack along IV-IV.

[0052] Figure 22 Schematic diagrams of the second housing and the second circuit board are shown in some embodiments.

[0053] Figure 23 A schematic diagram of the second adhesive protruding from the heat sink is shown in some other embodiments.

[0054] Figure 24 Schematic diagrams of electrical equipment in some embodiments are shown.

[0055] Explanation of key component symbols:

[0056] Battery pack 100

[0057] Housing assembly 10

[0058] First shell 11

[0059] First fixing hole 11a

[0060] First Wall 111

[0061] First opening 10a

[0062] Second Wall 112

[0063] Second opening 10b

[0064] Third Wall 113

[0065] First connecting hole 113b

[0066] First fastener 113c

[0067] Fourth Wall 114

[0068] Bottom wall 115

[0069] First Space 101

[0070] Second Space 102

[0071] Second shell 12

[0072] Second shell recess 12a

[0073] Second circuit board 13

[0074] First connecting part 131

[0075] Second connecting part 132

[0076] Connecting bracket 14

[0077] Through hole 141

[0078] Battery cell assembly 20

[0079] Cell 21

[0080] Cell casing 211

[0081] First outer shell 2111

[0082] Second outer shell 2112

[0083] First extension 2113

[0084] Second extension 2114

[0085] First sealing part 2115

[0086] Second sealing part 2116

[0087] Part 1 211a

[0088] Part 211b

[0089] First recess 211c

[0090] Electrode assembly 212

[0091] Electrode terminal 213

[0092] Welding part 213a

[0093] First terminal 213b

[0094] Second terminal 213c

[0095] First column of cells 21a

[0096] Second column of cells 21b

[0097] Heat dissipation section 22

[0098] First elastic element 221a

[0099] First circuit board 30

[0100] First connecting hole 30a

[0101] Second connecting hole 30b

[0102] Connector 30c

[0103] Hole 31

[0104] First hole 311

[0105] Second hole 312

[0106] Third hole 313

[0107] First conductive sheet 32

[0108] Second conductive sheet 33

[0109] Third conductive sheet 34

[0110] Fourth conductive sheet 35

[0111] First electrical connection part 100b

[0112] First conductive part 110

[0113] First insulation section 120

[0114] Second electrical connection part 100c

[0115] Second conductive part 130

[0116] Second insulation section 140

[0117] First fastener 150

[0118] First connector 40

[0119] 40a of storage space

[0120] Main body 41

[0121] First opening 41a

[0122] Second opening 41b

[0123] First end face 41c

[0124] First connecting wall 411

[0125] First extended region 411a

[0126] Second connecting wall 412

[0127] Second extension region 412a

[0128] Third connecting wall 413

[0129] Third extension area 413a

[0130] Fourth connecting wall 414

[0131] Fourth extension region 414a

[0132] Connecting post 42

[0133] Adhesive component 43

[0134] Third extension 44

[0135] Wire harness assembly 50

[0136] Wire 51

[0137] Connecting part 52

[0138] First paragraph 511

[0139] Second paragraph 512

[0140] First adhesive 60

[0141] Insulating bracket 70

[0142] Third opening 70a

[0143] Support body 71

[0144] First through hole 72

[0145] Fourth extension 73

[0146] Radiator 80

[0147] First sidewall 80a

[0148] Second sidewall 80b

[0149] Third sidewall 80c

[0150] Fourth sidewall 80d

[0151] Second fixing hole 810

[0152] First Channel 80e

[0153] First surface 80f

[0154] Second surface 80j

[0155] First storage space 81

[0156] Second accommodation space 82

[0157] Third accommodation space 83

[0158] Second adhesive 90

[0159] Inclined surface 90a

[0160] Third adhesive 910

[0161] Fourth adhesive 920

[0162] First insulating component 100a

[0163] 200 electrical appliances

[0164] First direction X

[0165] Second direction Y

[0166] Third direction Z

[0167] The following specific embodiments will further illustrate this application in conjunction with the above-described accompanying drawings. Detailed Implementation

[0168] The following specific embodiments are exemplary and not limiting, and are intended to provide a basic understanding of this application, and are not intended to identify key or decisive elements of this application or limit the scope of protection. As long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

[0169] When a component is considered to be "located" on another component, it can be directly on the other component or may also be interspersed with other components. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may also be interspersed with other components.

[0170] It's understandable that the terms "perpendicular" or "equal to" are used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular or equal to each other. For example, combined with numerical descriptions, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is a straight line or plane, the component can be considered a "straight line" or "plane."

[0171] The term "parallel" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately parallel. For example, in numerical terms, parallel can refer to the angle between two straight lines within the range of 180° ± 10°, the dihedral angle between two planes within the range of 180° ± 10°, or the angle between a straight line and a plane within the range of 180° ± 10°. The two components described as "parallel" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is straight or plane, the component can be considered a "straight line" or "plane".

[0172] Unless otherwise defined, the term "multiple" in this document, when used to describe the number of components, specifically means that the component is two or more.

[0173] Please see Figures 1 to 4 as well as Figure 10 One embodiment of this application provides a battery pack 100, including a housing assembly 10, a cell assembly 20, a first circuit board 30, a first connector 40, a wiring harness assembly 50, and a first adhesive 60. The cell assembly 20 is disposed within the housing assembly 10. The cell assembly 20 includes a plurality of cells 21. Each cell 21 includes a cell housing 211, an electrode assembly 212 disposed within the cell housing 211, and electrode terminals 213 connected to the electrode assembly 212 and extending from the cell housing 211. The first circuit board 30 is disposed within the housing assembly 10 and connected to the cell assembly 20. The first connector 40 connects to the side of the first circuit board 30 opposite to the cell housing 211, and the first connector 40 and the first circuit board 30 form a receiving space 40a. The wiring harness assembly 50 includes multiple wires 51 and a connecting portion 52. The multiple wires 51 are connected to the connecting portion 52. Each wire 51 includes a first segment 511 and a second segment 512. The first segment 511 is disposed in the receiving space 40a, and the second segment 512 is connected to the first segment 511 and extends out of the receiving space 40a. The connecting portion 52 is connected to the first circuit board 30. A first adhesive 60 is disposed in the receiving space 40a to insulate and waterproof the first segment 511, the connecting portion 52, and the covered portion of the first circuit board 30 within the receiving space 40a, thereby reducing the risk of short circuit in the battery pack 100.

[0174] In one embodiment, the first adhesive 60 at least partially covers the connection between the connector 52 and the first circuit board 30, providing insulation and waterproof protection for the connection between the connector 52 and the first circuit board 30, thereby reducing the risk of short circuit in the battery pack 100.

[0175] In one embodiment, a first adhesive 60 is disposed in the gap between the first connector 40 and the wiring harness assembly 50, and in the gap between the first segments 511. By disposing of the first adhesive 60 in the receiving space 40a and in the gap between the first connector 40 and the wiring harness assembly 50, the connection point between the connector 52 and the first circuit board 30 is insulated and waterproofed. By disposing of the first adhesive 60 in the gap between adjacent first segments 511, adjacent first segments 511 are bonded together, and other impurities are prevented from flowing from the gap between the first segments 511 to the connection point between the connector 52 and the first circuit board 30, reducing the risk of short circuits in the battery pack 100, such as water.

[0176] In one embodiment, the housing assembly 10 includes a first housing 11 and a second housing 12, with the first housing 11 connected to the second housing 12. The first housing 11 includes 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 disposed opposite to each other, and the third wall 113 and the fourth wall 114 are disposed opposite to each other. The bottom wall 115 is disposed opposite to the second housing 12. The first wall 111 connects the third wall 113 and the fourth wall 114, the second wall 112 connects the third wall 113 and the fourth wall 114, and the bottom wall 115 connects the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114, forming a first space 101. The first space 101 is used to accommodate at least one of the following components: the battery cell assembly 20, the first circuit board 30, the first connector 40, the wire harness assembly 50, and the first adhesive 60.

[0177] 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 means of screw locking, welding, or bonding. 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, for example, by using an injection molding process to form an integral structure, or by forming an integral structure by extruding metal materials.

[0178] Optionally, the first housing 11 includes a thermally conductive material to improve heat dissipation performance. Optionally, the thermally conductive material includes a metallic thermally conductive material and a thermally conductive insulating material, with the insulating material covering the outer surface of the metallic thermally conductive material. Optionally, the metallic thermally conductive material of the first housing 11 includes aluminum. Optionally, the surface of the first housing 11 includes a thermally conductive metallic material, which is beneficial for improving heat dissipation.

[0179] To better illustrate the structure of the battery pack 100, the structure of the battery pack 100 will be described using the X, Y, and Z coordinate axes. The X, Y, and Z coordinate axes are perpendicular to each other. The X direction is defined as the first direction, the Y direction as the second direction, and the Z direction as the third direction. The first direction X is the relative orientation of the second housing 12 and the bottom wall 115. The second direction Y is the relative orientation of the third wall 113 and the fourth wall 114. The third direction Z is the relative orientation of the first wall 111 and the second wall 112. The third direction Z is perpendicular to both the second direction Y and the first direction X.

[0180] Please see Figure 4 , Figure 5 , Figure 6 , Figure 15 and Figure 16In one embodiment, the battery cell housing 211 includes a first portion 211a and a second portion 211b, the first portion 211a accommodating an electrode assembly 212, the second portion 211b connecting to the first portion 211a, and an electrode terminal 213 extending from the second portion 211b.

[0181] In one embodiment, the battery cell housing 211 includes a first outer shell 2111 and a second outer shell 2112, with the first outer shell 2111 connected to the second outer shell 2112. At least one of the first outer shell 2111 and the second outer shell 2112 has a first recess 211c, and the electrode assembly 212 is disposed in the first recess 211c. The first outer shell 2111 and the second outer shell 2112 can be folded along the connection position so that the first outer shell 2111 and the second outer shell 2112 overlap to form a first portion 211a to cover the electrode assembly 212. The peripheral side of the first outer shell 2111 extends outward to form a plurality of first extensions 2113, and the peripheral side of the second outer shell 2112 extends outward to form a plurality of second extensions 2114. After the first outer shell 2111 and the second outer shell 2112 are folded along the connection position, the first extensions 2113 and the second extensions 2114 overlap and are sealed together to form a second portion 211b. Optionally, the first extensions 2113 and the second extensions 2114 are sealed together by a sealant. The second part 211b includes a first sealing part 2115 and a second sealing part 2116. The first sealing part 2115 is disposed opposite to the connection position, and the electrode terminal 213 extends out of the first sealing part 2115 into the first part 211a. Optionally, the second part 211b includes two second sealing parts 2116, which are disposed opposite to each other along a second direction Y and a first direction X. Optionally, the second part 211b includes one first sealing part 2115, and the battery cell 21 includes two electrode terminals 213, which extend out of the battery cell housing 211 from the first sealing part 2115. In other embodiments, the first housing 2111 and the second housing 2112 are separate, the second part 211b includes two first sealing portions 2115, the two first sealing portions 2115 are arranged opposite each other along the first direction X, the battery cell 21 includes two electrode terminals 213, one electrode terminal 213 extends out of the battery cell housing 211 from one of the first sealing portions 2115, and the other electrode terminal 213 extends out of the battery cell housing 211 from the other first sealing portion 2115, the two electrode terminals 213 are arranged opposite each other along the first direction X.

[0182] In one embodiment, the electrode assembly 212 includes a wound structure formed by winding a positive electrode sheet, a negative electrode sheet, and a separator. In other embodiments, the electrode assembly 212 may also be a stacked structure, i.e., the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked to form an electrode assembly 212 unit, and multiple electrode assembly 212 units are then stacked to form the electrode assembly 212. Optionally, the cell housing 211 includes an aluminum-plastic film. Optionally, the cell 21 includes a pouch cell.

[0183] In one embodiment, the electrode terminal 213 has a weld portion 213a extending beyond the cell housing 211, the weld portion 213a being formed by bending the electrode terminal 213. The electrode terminals 213 of adjacent cells 21 are bent toward each other through the first circuit board 30 and connected to the first circuit board 30. In one embodiment, the electrode terminal 213 includes a first terminal 213b and a second terminal 213c, the first terminal 213b and the second terminal 213c having opposite polarities, one being a positive terminal and the other a negative terminal. Along the third direction Z, the projection of the weld portion 213a of the first terminal 213b of the cell 21 at least partially overlaps with the projection of the weld portion 213a of the second terminal 213c of the adjacent cell 21. The first terminals 213b and the second terminals 213c of adjacent cells 21 are bent toward each other, and the weld portions 213a of the first terminal 213b and the weld portions 213a of the second terminal 213c are stacked and connected to each other. By connecting the welding portions 213a of adjacent cells 21 to each other, the welding portions 213a are connected to the first circuit board 30, reducing the number of processing steps.

[0184] In other embodiments, along the third direction Z, the projection of the first terminal 213b of the battery cell 21 can at least partially overlap with 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.

[0185] In one embodiment, the battery cell assembly 20 includes a plurality of battery cells 21 stacked along a third direction Z. Optionally, the battery cell assembly 20 includes a plurality of battery cells 21, wherein some of the battery cells 21 are stacked along a third direction Z to form a first column of battery cells 21a, and some of the battery cells 21 are stacked along a third direction Z to form a second column of battery cells 21b, wherein the second column of battery cells 21b and the first column of battery cells 21a are arranged along a second direction Y.

[0186] In one embodiment, the battery cell 21 is in contact with the first housing 11, so that the heat of the battery cell 21 is dissipated to the external environment through the first housing 11.

[0187] In one embodiment, the battery cell assembly 20 further includes a plurality of heat dissipation portions 22, which are in contact with the battery cell 21 to dissipate heat from the battery cell 21. Optionally, the heat dissipation portions 22 are in contact with the first housing 11 to transfer heat from the battery cell 21 to the first housing 11, thereby dissipating heat from the battery cell 21 through the first housing 11. Optionally, the heat dissipation portions 22 include an aluminum shell.

[0188] In one embodiment, along the third direction Z, the projection of the heat dissipation part 22 overlaps with the projection of the cell housing 211; along the second direction Y, the projection of the heat dissipation part 22 overlaps with the projection of the cell housing 211; and along the first direction X, the projection of the heat dissipation part 22 overlaps with the projection of the cell housing 211, thereby increasing the contact area between the heat dissipation part 22 and the cell housing 211 and improving the heat dissipation efficiency.

[0189] In one embodiment, a first elastic member 221a is provided between adjacent heat dissipation portions 22, and a gap is provided between adjacent battery cells 21, which can increase the width between adjacent battery cells 21 along the third direction Z. Optionally, the first elastic member 221a includes foam.

[0190] Please see Figures 7 to 10 In one embodiment, the first circuit board 30 is provided with a first connection hole 30a. Optionally, along the second direction Y, the first connection hole 30a is located at the middle position of the first circuit board 30. A connection portion 52 is provided in the first connection hole 30a. Optionally, multiple wires 51 are arranged sequentially along the third direction Z, and the ends of the multiple wires 51 are connected to the connection portion 52. The connection portion 52 is provided in the first connection hole 30a. By providing the connection portion 52, it is convenient for the wire harness assembly 50 to be connected to the first circuit board 30, and to realize the electrical connection of multiple wires 51 to the first circuit board 30. Information such as current, voltage, resistance, and temperature of the battery cell 21 can be obtained through the multiple wires 51. Optionally, multiple wire harness assemblies 50 can be provided, and each wire harness assembly 50 is provided with a connection portion 52, which facilitates the assembly of the wire harness assembly 50 onto the first circuit board 30.

[0191] In one embodiment, the connecting portion 52 is soldered to the first circuit board 30 and disposed in the first connecting hole 30a, increasing the connection strength between the connecting portion 52 and the first circuit board 30. Optionally, the first circuit board 30 includes a connector 30c, which is fixed to the first connecting hole 30a. The connecting portion 52 is inserted into the connector 30c to achieve the connection between the wire 51 and the first circuit board 30. The connector 30c allows the connecting portion 52 to be detached and installed, simplifying the replacement process and facilitating maintenance. Optionally, the connecting portion 52 includes a connector, which is soldered to the first circuit board 30.

[0192] In one embodiment, the first circuit board 30 is provided with a second connection hole 30b. Optionally, along the second direction Y, the second connection hole 30b is located at the middle position of the first circuit board 30. A first connector 40 is disposed in the second connection hole 30b, restricting the movement of the first connector 40.

[0193] In one embodiment, the first circuit board 30 is provided with multiple sets of holes 31, each set of holes 31 including a first hole 311 and a second hole 312 disposed along a third direction Z. A first terminal 213b of an adjacent battery cell 21 passes through the first hole 311, and a second terminal 213c of another battery cell 21 passes through the second hole 312. The solder portions 213a of the first terminal 213b and the solder portions 213a of the second terminal 213c are stacked together and connected to the first circuit board 30. Optionally, the first circuit board 30 includes a flexible printed circuit board (FPC). Optionally, the first circuit board 30 includes a printed circuit board (PCB). Optionally, the first circuit board 30 includes wires (not shown) electrically connected to the connection portion 52 and the electrode terminals 213. Optionally, the first circuit board 30 can collect information from the electrode terminals 213 and transmit it to the second circuit board 13, such as voltage, current, resistance, temperature, etc.

[0194] In one embodiment, the first circuit board 30 includes a first conductive sheet 32. Optionally, the first conductive sheet 32 ​​may be a copper foil disposed on the first circuit board 30, and the copper foil is connected to wiring on the first circuit board 30. Optionally, the first conductive sheet 32 ​​may be a conductive sheet disposed on the first circuit board 30, such as a copper busbar, and the conductive sheet is soldered to the first circuit board 30.

[0195] In one embodiment, viewed along the first direction X, a first conductive sheet 32 ​​is located between a first hole 311 and a second hole 312. A first terminal 213b of an adjacent battery cell 21 passes through the first hole 311, and a second terminal 213c of another battery cell 21 passes through the second hole 312. The welding portions 213a of the first terminal 213b and the welding portions 213a of the second terminal 213c are stacked and welded to the first conductive sheet 32. The welding portions 213a and the first conductive sheet 32 ​​are arranged along the first direction X. Welding includes laser welding, ultrasonic welding, etc. In other embodiments, the welding portions 213a and the first conductive sheet 32 ​​can also be connected by other methods such as conductive adhesive.

[0196] In one embodiment, each group of holes 31 further includes a third hole 313 extending through the first circuit board 30 along a third direction Z. Some of the third holes 313 are arranged along a second direction Y, and some of the third holes 313 are arranged along a first direction X.

[0197] In one embodiment, the first circuit board 30 is provided with a second conductive sheet 33. Optionally, the second conductive sheet 33 may be a copper foil disposed on the first circuit board 30, and the copper foil is connected to wiring on the first circuit board 30. Optionally, the second conductive sheet 33 may be a conductive sheet disposed on the first circuit board 30, such as a copper busbar, and the conductive sheet is soldered to the first circuit board 30. Along 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 second conductive sheet 33.

[0198] In one embodiment, the first circuit board 30 is provided with a third conductive sheet 34. Optionally, the third conductive sheet 34 may be a copper foil disposed on the first circuit board 30, and the copper foil is connected to wiring on the first circuit board 30. Optionally, the third conductive sheet 34 may be a conductive sheet disposed on the first circuit board 30, such as a copper busbar, and the conductive sheet is soldered to the first circuit board 30. Along the third direction Z, the electrode terminal 213 of the other one of the two outermost battery cells 21 is connected to the third conductive sheet 34.

[0199] In one embodiment, the first circuit board 30 is provided with a fourth conductive sheet 35. Optionally, the fourth conductive sheet 35 may be a copper foil disposed on the first circuit board 30, and the copper foil is connected to wiring on the first circuit board 30. Optionally, the fourth conductive sheet 35 may be a conductive sheet disposed on the first circuit board 30, such as a copper busbar, and the conductive sheet is soldered to the first circuit board 30. Along 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 one of the two outermost cells 21 is connected to the fourth conductive sheet 35. The third conductive sheet 34 connects the electrode terminals 213 of the two cells 21 arranged along the second direction Y, for transmitting current from the first column of cells 21a to the second column of cells 21b, realizing a series connection or parallel connection between the first column of cells 21a and the second column of cells 21b. Optionally, along the third direction Z, 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 current transmission can be increased.

[0200] In one embodiment, the battery pack 100 further includes a first electrical connection portion 100b and a second electrical connection portion 100c. The first electrical connection portion 100b and the second electrical connection portion 100c are used for input or output of electrical energy. Optionally, the first electrical connection portion 100b and the second electrical connection portion 100c are soldered to a first circuit board 30. Optionally, the first electrical connection portion 100b is connected to one of the first terminal 213b and the second terminal 213c, and the second electrical connection portion 100c is connected to the other. Optionally, the first electrical connection portion 100b and the second electrical connection portion 100c include copper busbars.

[0201] In one embodiment, the first electrical connection portion 100b includes a first conductive portion 110 and a first insulating portion 120. The first insulating portion 120 is sleeved on the first conductive portion 110, and both ends of the first conductive portion 110 extend out of the first insulating portion 120. Optionally, one end of the first conductive portion 110 extending out of the first insulating portion 120 is connected to the second conductive sheet 33, and the other end is connected to the first connection portion 131 of the second circuit board 13. Optionally, one end of the first conductive portion 110 extending out of the first insulating portion 120 is connected to the first circuit board 30, and the other end is directly connected to the first connection portion 131 of the second circuit board 13.

[0202] In one embodiment, the second electrical connection portion 100c includes a second conductive portion 130 and a second insulating portion 140. The second insulating portion 140 is sleeved on the second conductive portion 130, and both ends of the second conductive portion 130 extend out of the second insulating portion 140. Optionally, one end of the second conductive portion 130 extending out of the second insulating portion 140 is connected to a fourth conductive sheet 35, and the other end is connected to a first connection portion 131 of the second circuit board 13. Optionally, one end of the second conductive portion 130 extending out of the second insulating portion 140 is connected to a first circuit board 30, and the other end is directly connected to a second connection portion 132 of the second circuit board 13.

[0203] Please see Figures 7 to 13 as well as Figures 19 to 20In one embodiment, the first connector 40 includes a main body 41. Viewed along the first direction X, the main body 41 surrounds the connector 52, reducing the overflow of the first adhesive 60 from the main body 41. The main body 41 can be any structure surrounding the connector 52, such as a cylindrical structure, an elliptical cylinder structure, a regular prism structure, or an irregular prism structure. The regular prism structure can be a triangular prism, a square prism, a pentagonal prism, etc. This application uses a square prism as an example for illustration. Optionally, the main body 41 includes a first connecting wall 411, a second connecting wall 412, a third connecting wall 413, and a fourth connecting wall 414. The first connecting wall 411 and the second connecting wall 412 are arranged along the third direction Z, and the third connecting wall 413 and the fourth connecting wall 414 are arranged along the second direction Y. The first connecting wall 411 connects to the third connecting wall 413 and the fourth connecting wall 414, and the second connecting wall 412 connects to the third connecting wall 413 and the fourth connecting wall 414. The first connecting wall 411, the second connecting wall 412, the third connecting wall 413, and the fourth connecting wall 414 connect to the first circuit board 30 and form a receiving space 40a. Viewed along the first direction X, the first connecting wall 411, the second connecting wall 412, the third connecting wall 413, and the fourth connecting wall 414 surround the connecting portion 52.

[0204] In one embodiment, the main body 41 is provided with a first opening 41a, the first opening 41a is connected to the receiving space 40a, and the second segment 512 extends out of the receiving space 40a from the first opening 41a.

[0205] The main body 41 has a second opening 41b, and the first opening 41a and the second opening 41b are arranged along a first direction X. The second opening 41b communicates with the receiving space 40a. The connecting part 52 is connected to the first connecting hole 30a through the second opening 41b. The first adhesive 60 flows into the receiving space 40a through the first opening 41a and is connected to the first circuit board 30 through the second opening 41b.

[0206] In one embodiment, the main body 41 is made of an insulating material, for example, integrally molded by injection molding. Optionally, the main body 41 includes an insulating material and a metal material, with the insulating material covering the outer surface of the metal material.

[0207] In one embodiment, the main body 41 includes a first end face 41c, which is connected to the first circuit board 30. Optionally, a first connecting wall 411, a second connecting wall 412, a third connecting wall 413, and a fourth connecting wall 414 are connected to one end surface of the first circuit board 30 to form the first end face 41c.

[0208] In one embodiment, the first connector 40 is provided with a plurality of connecting posts 42, which are disposed on the first end face 41c. The number of connecting posts 42 is the same as the number of second connecting holes 30b. When the first connector 40 is connected to the first circuit board 30, each connecting post 42 is disposed in each second connecting hole 30b, and the first connector 40 is positioned and fixed through the second connecting holes 30b, facilitating the installation of the first connector 40. Optionally, the third connecting wall 413 is provided with connecting posts 42 on one end surface of the first circuit board 30, the fourth connecting wall 414 is provided with connecting posts 42 on one end surface of the first circuit board 30, the surface at the connection between the first connecting wall 411 and the third connecting wall 413 at one end of the first circuit board 30 is provided with connecting posts 42, and the surface at the connection between the second connecting wall 412 and the fourth connecting wall 414 at one end of the first circuit board 30 is provided with connecting posts 42.

[0209] In one embodiment, the battery pack 100 includes an adhesive 43, through which the first circuit board 30 and the first connector 40 are connected, restricting the flow of the first adhesive 60 outside the receiving space 40a. The adhesive 43 is disposed on the first end face 41c, and a plurality of connecting posts 42 pass through the adhesive 43. When the first connector 40 is connected to the first circuit board 30, the adhesive 43 is adhered to the first circuit board 30, further fixing the position of the first connector 40.

[0210] In one embodiment, the adhesive 43 is disposed on the first circuit board 30. When the first connector 40 is connected to the first circuit board 30, the adhesive 43 is adhered to the first connector 40, further fixing the position of the first connector 40.

[0211] In one embodiment, the first connector 40 includes a third extension 44, which connects to the first end face 41c. Optionally, the first connecting wall 411 has a first extension region 411a extending in a third direction Z at one end facing the first circuit board 30, the second connecting wall 412 has a second extension region 412a extending in a direction opposite to the third direction Z at one end facing the first circuit board 30, the third connecting wall 413 has a third extension region 413a extending in a second direction Y at one end facing the first circuit board 30, and the fourth connecting wall 414 has a fourth extension region 414a extending in a direction opposite to the second direction Y at one end facing the first circuit board 30. The first extension region 411a connects the third extension region 413a and the fourth extension region 414a, and the second extension region 412a connects the third extension region 413a and the fourth extension region 414a, forming the third extension 44.

[0212] Optionally, a portion of the connecting post 42 is located on the first end face 41c, and the remaining portion of the connecting post 42 is located on the third extension 44. By providing the third extension 44, it is convenient to install the connecting post 42.

[0213] Optionally, the adhesive 43 is disposed on the first end face 41c and the third extension 44. The area of ​​the adhesive 43 is increased by the third extension 44, thereby increasing the area of ​​the adhesive 43 connected to the first circuit board 30 and improving the connection strength between the first connector 40 and the first circuit board 30.

[0214] In one embodiment, when assembling the first connector 40 onto the first circuit board 30, the first connector 40 is first fitted onto the wiring harness assembly 50, the wiring harness assembly 50 is connected to the first connection hole 30a via the connecting part 52, then the connecting post 42 is placed in the second connection hole 30b, and the first connector 40 is bonded to the first circuit board 30 via the adhesive 43. The wiring harness assembly 50 is fixed by an external clamp to keep it perpendicular to the first circuit board 30, and then the first adhesive 60 is injected into the receiving space 40a via an external potting device. After the first adhesive 60 cures, it seals the receiving space 40a, providing waterproofing and bonding adjacent wires 51 together, preventing liquid from flowing from the gaps between adjacent wires 51 to the connection position between the wiring harness assembly 50 and the first circuit board 30, thus reducing the risk of short circuit in the battery pack 100.

[0215] In one embodiment, the wiring harness assembly 50 is configured to transmit information from the cell assembly 20 to the second circuit board 13. Optionally, the wiring harness assembly 50 includes a sampling harness that collects information such as current, voltage, resistance, and temperature of the cell 21 connected to the first circuit board 30 via multiple wires 51.

[0216] In one embodiment, the first adhesive 60 is configured to be formed by curing a flowing first insulating material disposed in the receiving space 40a. Optionally, the first adhesive 60 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the first adhesive 60 includes a foaming adhesive. Optionally, the viscosity A of the first adhesive 60 satisfies 1000 mPa·s ≤ A ≤ 2000 mPa·s. Viscosity A satisfies any one of the following values: 1000 mPa·s, 1050 mPa·s, 1100 mPa·s, 1150 mPa·s, 1200 mPa·s, 1250 mPa·s, 1300 mPa·s, 1350 mPa·s, 1400 mPa·s, 1450 mPa·s, 1500 mPa·s, 1550 mPa·s, 1600 mPa·s, 1650 mPa·s, 1700 mPa·s, 1750 mPa·s, 1800 mPa·s, 1850 mPa·s, 1900 mPa·s, 1950 mPa·s, and 2000 mPa·s.

[0217] Please see Figure 14 , Figure 15 and Figure 16In one embodiment, the battery pack 100 includes an insulating support 70, which includes a support body 71. The support body 71 covers a portion of the first circuit board 30 and insulates the first circuit board 30.

[0218] Optionally, the insulating support 70 is made of an insulating material. Alternatively, the insulating support 70 is made of a metal material and an insulating material, with the insulating material covering the outer surface of the metal material.

[0219] In one embodiment, the insulating support 70 is provided with a third opening 70a, which penetrates the insulating support 70 along a first direction X, and the main body 41 passes through the third opening 70a. Optionally, along a second direction Y, the third opening 70a is located at the middle position of the support body 71.

[0220] In one embodiment, the insulating bracket 70 is provided with a first through hole 72, which extends through the bracket body 71 along the third direction Z.

[0221] In one embodiment, the insulating support 70 includes a fourth extension 73. The fourth extension 73 connects to the support body 71. Along the third direction Z, the projection of the fourth extension 73 overlaps with the projection of the first circuit board 30, thus limiting the position of the insulating support 70 connected to the first circuit board 30 for easy assembly. Optionally, along the third direction Z, the projection of the first circuit board 30 is located within the projection of the fourth extension 73. Optionally, along the third direction Z, the projection of the fourth extension 73 overlaps with the projections of the cell housing 211 and the electrode terminals 213, providing insulation for the electrode terminals 213. Optionally, along the third direction Z, the projection of the solder portion 213a is located within the projection of the fourth extension 73, further enhancing insulation.

[0222] Please see Figure 4 , Figures 14 to 18In one embodiment, the battery pack 100 further includes a heat sink 80 disposed within the first space 101 and located on the side of the insulating support 70 opposite to the first circuit board 30. The heat sink 80 connects the inner surfaces of the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114. Optionally, the heat sink 80 includes a first sidewall 80a and a second sidewall 80b disposed along a third direction Z, with the first sidewall 80a connected to the first wall 111 and the second sidewall 80b connected to the second wall 112. The heat sink 80 also includes a third sidewall 80c and a fourth sidewall 80d disposed along a second direction Y, with the third sidewall 80c connected to the third wall 113 and the fourth sidewall 80d connected to the fourth wall 114. Optionally, the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114 are each provided with a first fixing hole 11a, and the first side wall 80a, the second side wall 80b, the third side wall 80c, and the fourth side wall 80d are each provided with a second fixing hole 810. The battery pack 100 includes a first fastener 150, which passes through the first fixing hole 11a and the second fixing hole 810 to fix the first side wall 80a to the first wall 111, the second side wall 80b to the second wall 112, the third side wall 80c to the third wall 113, and the fourth side wall 80d to the fourth wall 114.

[0223] In one embodiment, the heat sink 80 has a first channel 80e, a first opening 10a on the first wall 111, and a second opening 10b on the second wall 112. The first channel 80e connects the first opening 10a and the second opening 10b. The heat sink 80 dissipates heat from the electrode terminals 213 through the first channel 80e from the first opening 10a and the second opening 10b to the external environment, thereby reducing the temperature of the battery pack 100. Optionally, the heat sink 80 has multiple first channels 80e, which are arranged along the second direction Y.

[0224] In one embodiment, the battery pack 100 can utilize external air to dissipate heat from the first circuit board 30 and the cell assembly 20 through airflow. In one embodiment, the battery pack 100 can be used on a device that is static during use, where natural wind or external air-cooling equipment can be used for heat dissipation. In one embodiment, the battery pack 100 can be used on a device that is dynamic during use, such as a drone or an electric bicycle, where the faster airflow during device movement allows for rapid heat dissipation of the battery pack 100.

[0225] In one embodiment, the outer surface of the heat sink 80 includes a layer of metallic material, such as aluminum, to facilitate heat dissipation. Optionally, the heat sink 80 may be made of metallic material, and the outer surface of the heat sink 80 may be coated with an insulating layer. Alternatively, the heat sink 80 may be made of metallic material, and the outer surface of the heat sink 80 may include a layer of metallic material.

[0226] Please see Figure 4 , Figure 18 and Figure 22 In one embodiment, the battery pack 100 further includes a second circuit board 13. The second housing 12 has a second housing recess 12a, and the second circuit board 13 is disposed within the second housing recess 12a, and the second circuit board 13 is insulated from the second housing 12. The second circuit board 13 has a first connecting portion 131 and a second connecting portion 132, the first connecting portion 131 being electrically connected to a first electrical connecting portion 100b, and the second connecting portion 132 being electrically connected to a second electrical connecting portion 100c.

[0227] In one embodiment, the information of the battery cell 21 collected by the first circuit board 30 is transmitted to the second circuit board 13 via the wiring harness assembly 50. The second circuit board 13 includes a Battery Management System (BMS) component, which includes multiple electronic components capable of controlling, protecting, communicating, calculating power, transmitting signals, and transmitting power to the battery cell 21. Optionally, the second circuit board 13 includes a flexible printed circuit board (FPC). Optionally, the second circuit board 13 includes a printed circuit board (PCB), on which multiple wires (not shown) are disposed.

[0228] In one embodiment, the battery pack 100 further includes a connecting bracket 14 disposed between the first housing 11 and the second housing 12, with the first housing 11 and the second housing 12 connected to the connecting bracket 14. The connecting bracket 14 is disposed between the second circuit board 13 and the heat sink 80, which can reduce the risk of short circuit between the second circuit board 13 and the heat sink 80. Optionally, the connecting bracket 14 is made of an insulating material.

[0229] In one embodiment, a second space 102 is formed between the connecting bracket 14 and the heat sink 80. The connecting bracket 14 has a bracket through hole 141 that connects to the second space 102, which facilitates heat dissipation from the heat sink 80 to the second circuit board 13. The heat generated by the second circuit board 13 accumulates in the second space 102. When the first channel 80e dissipates heat, the surface temperature of the heat sink 80 near the second circuit board 13 is lower, transferring the heat generated by the second circuit board 13 to the surface of the heat sink 80, thus dissipating heat from the second circuit board 13.

[0230] Please see Figure 17 , Figures 19 to 20 In one embodiment, the heat sink 80 includes a first accommodating space 81, which extends through the heat sink 80 along a first direction X. Optionally, along a second direction Y, the first accommodating space 81 is located at the middle position of the heat sink 80. A first connector 40 is disposed within the first accommodating space 81, and multiple wires 51 pass through the first accommodating space 81 and are connected to the second circuit board 13. Along a third direction Z, the projection of a portion of the main body 41 lies within the projection of the first accommodating space 81, and the projection of the remaining portion of the main body 41 lies within the projection of the space between the insulating support 70 and the heat sink 80, thus providing insulation protection for the main body 41.

[0231] In one embodiment, the radiator 80 includes a second accommodating space 82, one of the two outermost first channels 80e arranged along the second direction Y communicates with the second accommodating space 82, the second accommodating space 82 passes through the radiator 80 along the first direction X, and the first electrical connection portion 100b passes through the insulating bracket 70 and the second accommodating space 82 and is connected to the first connection portion 131.

[0232] In one embodiment, the radiator 80 includes a third accommodating space 83, and the other of the two outermost first channels 80e arranged along the second direction Y communicates with the third accommodating space 83. The third accommodating space 83 penetrates the radiator 80 along the first direction X. The second electrical connection portion 100c passes through the insulating bracket 70 and the third accommodating space 83 and is connected to the second connection portion 132.

[0233] In one embodiment, the heat sink 80 includes a first surface 80f and a second surface 80j disposed along a first direction X, the first surface 80f facing the second circuit board 13, and the second surface 80j connected to the insulating support 70. The battery pack 100 also includes a second adhesive 90. Optionally, the second adhesive 90 is disposed in the receiving space 40a and the first receiving space 81, and the second adhesive 90 connects to the first adhesive 60 to seal and insulate the receiving space 40a, reducing the possibility of liquid entering the first receiving space 81 and from the first receiving space 81 into the connection between the wiring harness assembly 50 and the first circuit board 30, thereby reducing the risk of short circuit.

[0234] Optionally, a second adhesive 90 is disposed in the gap between the first connector 40 and the first receiving space 81, and in the gap between the multiple wires 51 and the heat sink 80. The second adhesive 90 connects to the first adhesive 60. The second adhesive 90 protrudes from the first surface 80f. By disposing of the second adhesive 90 in the first receiving space 81, between the multiple wires 51 and the heat sink 80, and by protruding from the first surface 80f of the heat sink 80, the possibility of liquid entering the first receiving space 81 and from the first receiving space 81 into the connection between the wire harness assembly 50 and the first circuit board 30 is further reduced, thus reducing the risk of short circuits. In one embodiment, a portion of the second adhesive 90 is disposed within the receiving space 40a, and the second adhesive 90 connects to the first adhesive 60 within the receiving space 40a.

[0235] In one embodiment, the second adhesive 90 is configured to be formed by curing a flowing second insulating material disposed in the first accommodating space 81. Optionally, the second adhesive 90 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the second adhesive 90 includes a foaming adhesive.

[0236] Optional, such as Figure 23 As shown, the portion of the second adhesive 90 that protrudes from the first surface 80f has an inclined surface 90a. By providing the inclined surface 90a, the accumulation of liquid on the surface of the second adhesive 90 is reduced, which further reduces the possibility of liquid entering the connection between the wire harness assembly 50 and the first circuit board 30, and further reduces the risk of short circuit.

[0237] Optionally, the flowable second adhesive 90 is formed by injection into the first receiving space 81 and then fixed thereafter. Optionally, the viscosity of the second adhesive 90 is greater than that of the first adhesive 60, which facilitates the flow of the first adhesive 60 into the gaps between the first segments 511, and helps to prevent liquid from entering the receiving space 40a from the gaps between the first segments 511, reducing the risk of short circuit. Optionally, the viscosity B of the second adhesive 90 satisfies 4000 MPa·s ≤ B ≤ 5000 MPa·s. Viscosity B satisfies any one of the following values: 4000 mPa·s, 4050 mPa·s, 4100 mPa·s, 4150 mPa·s, 4200 mPa·s, 4250 mPa·s, 4300 mPa·s, 4350 mPa·s, 4400 mPa·s, 4450 mPa·s, 4500 mPa·s, 4550 mPa·s, 4600 mPa·s, 4650 mPa·s, 4700 mPa·s, 4750 mPa·s, 4800 mPa·s, 4850 mPa·s, 4900 mPa·s, 4950 mPa·s, and 5000 mPa·s.

[0238] Optionally, when the second adhesive 90 is injected into the first receiving space 81, the external dispensing device dispenses adhesive along the portion of the wire harness assembly 50 that protrudes from the second adhesive 90, so that the second adhesive 90 flows into the first receiving space 81 along the wire harness assembly 50. This can reduce the voids in the cured second adhesive 90 and facilitate the formation of the inclined surface 90a.

[0239] In one embodiment, the battery pack 100 further includes a third adhesive 910 disposed in the second accommodating space 82 to insulate and fix the first electrical connection portion 100b. The third adhesive 910 protrudes from the first surface 80f to reduce the possibility of liquid entering the second accommodating space 82.

[0240] In one embodiment, the third adhesive 910 is configured to be formed by curing a flowing third insulating material disposed in the second accommodating space 82. Optionally, the third adhesive 910 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the third adhesive 910 includes a foaming adhesive.

[0241] In one embodiment, the battery pack 100 further includes a fourth adhesive 920 disposed in the third accommodating space 83 to insulate and fix the second electrical connection portion 100c. The fourth adhesive 920 protrudes from the first surface 80f, reducing the possibility of liquid entering the third accommodating space 83.

[0242] In one embodiment, the fourth adhesive 920 is configured to be formed by curing a flowing fourth insulating material disposed in the third accommodating space 83. Optionally, the fourth adhesive 920 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the fourth adhesive 920 includes a foaming adhesive.

[0243] Please see Figures 18 to 21 In one embodiment, the battery pack 100 further includes a first insulating member 100a, which is connected to the inner surfaces of the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114. The first insulating member 100a bonds the cell assembly 20, the first circuit board 30, the insulating bracket 70, and the heat sink 80 together, sealing and insulating the space between the cell assembly 20 and the heat sink 80. When the battery pack 100 is subjected to external impact, the first insulating member 100a can enhance the protection of the battery pack 100 and reduce the impact of external impurities, such as water, on the first circuit board 30 and the electrode terminals 213.

[0244] Optionally, the first insulating component 100a has a good thermal conductivity, which is beneficial to improving the heat dissipation of the battery pack 100. The thermal conductivity of the first insulating component 100a is C, where 0.8 W / (m·K) < C ≤ 3.0 W / (m·K). The thermal conductivity C satisfies any one of the following: 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), and 3.0 W / (m·K).

[0245] In one embodiment, the first insulating element 100a is configured to be formed by applying a flowing fifth insulating material to the battery pack and then curing it 100. Optionally, the first insulating element 100a includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the first insulating element 100a includes expanding foam. In one embodiment, a cell assembly 20, a first circuit board 30, a first connector 40, a wiring harness assembly 50, an insulating support 70, and a heat sink 80 are installed within a first housing 11, and the heat sink 80 is connected to the first housing 11. A second adhesive 90 is injected into a first accommodating space 81 to seal it. A third adhesive 910 is injected into a second accommodating space 82 to seal it. A fourth adhesive 920 is injected into a third accommodating space 83 to seal it. This reduces the outflow of the fifth insulating material from the first accommodating space 81, the second accommodating space 82, and the third accommodating space 83 during the injection of the fifth insulating material. Then, the first housing 11 is inverted, and flowing resin or potting compound is injected into the battery pack 100. After inversion, the heat sink 80, the insulating support 70, and the first circuit board 30 are arranged sequentially. Optionally, the flowing fifth insulating material is injected into the battery pack 100 from the bottom of the cell assembly 20 in a direction opposite to the first direction X.

[0246] In one embodiment, the first insulating member 100a flows through the first through hole 72 between the insulating bracket 70 and the heat sink 80, sealing and insulating the space between the insulating bracket 70 and the heat sink 80, and connecting the insulating bracket 70 and the heat sink 80. The first insulating member 100a connects to the main body portion 41 located in the space between the insulating bracket 70 and the heat sink 80.

[0247] In one embodiment, a first insulating member 100a is provided between the support body 71 and the first circuit board 30. The first insulating member 100a seals and insulates the space between the support body 71 and the first circuit board 30. The insulating support 70 and the first circuit board 30 are connected through the first insulating member 100a, which can further insulate the first circuit board 30.

[0248] In one embodiment, the first insulating member 100a covers the portion of the electrode terminal 213 extending out of the cell housing 211, thereby strengthening the fixation of the electrode terminal 213 and improving the heat dissipation of the electrode terminal 213.

[0249] In one embodiment, the first insulating member 100a covers a portion of the electrode terminal 213 extending out of the cell housing 211 and at least a portion of the first sealing portion 2115, thereby enhancing the protection of the first sealing portion 2115 and improving the heat dissipation of the cell housing 211.

[0250] In one embodiment, when the fifth insulating material is poured in an inverted manner, the battery cell 21, the first circuit board 30, the first connector 40, the wiring harness assembly 50, the insulating bracket 70, and the heat sink 80 are first installed on the first housing 11, and the heat sink 80 is connected to the first housing 11. Then, the flowing first insulating material is placed in the receiving space 40a, and after curing, it forms the first adhesive 60. The flowing second insulating material is injected into the first receiving space 81, the flowing third insulating material is injected into the second receiving space 82, and the flowing fourth insulating material is injected into the third receiving space 83. After the second, third, and fourth insulating materials are cured, they seal the heat sink 80. Then, the first housing 11 is inverted, and the flowing fifth insulating material is injected into the battery pack 100 from the bottom of the battery cell assembly 20 in a direction opposite to the first direction X. After the fifth insulating material is cured, it forms the first insulating component 100a. Then, the bottom wall 115 is connected and fixed to the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114.

[0251] Please see Figure 24 This application also provides an electrical device 200 employing the aforementioned battery pack 100. In one embodiment, the electrical device 200 of this application may be, but is not limited to, a drone, a backup power supply, an electric vehicle, an electric motorcycle, an electric-assisted bicycle, a power tool, a large household storage battery, etc.

[0252] Those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the spirit and essence of this application fall within the scope of this application's disclosure.

Claims

1. A battery pack characterized by comprising: The battery pack comprises a housing assembly, an electric core assembly accommodated in the housing assembly, the electric core assembly comprising a plurality of electric cores, each of the electric cores comprising an electric core housing, an electrode assembly arranged in the electric core housing, and an electrode terminal connected to the electrode assembly and extending out of the electric core housing, a first circuit board connected to the electrode terminals, the first circuit board and the electric core assembly being arranged along a first direction, a first connecting member arranged on a side of the first circuit board away from the electric core housing, the first connecting member and the first circuit board forming an accommodation space, a wire harness assembly comprising a connecting portion and a plurality of wires connected to the connecting portion, the connecting portion being connected to the first circuit board, each of the wires comprising a first segment arranged in the accommodation space and a second segment extending out of the accommodation space, and the connecting portion being located in the accommodation space when viewed along the first direction, a first adhesive filled in the accommodation space, the battery pack comprising a heat sink and a second adhesive, the heat sink being provided with a first accommodating space, the first accommodating space penetrating through the heat sink along the first direction, a portion of the first connecting member being arranged in the first accommodating space, and the plurality of wires extending out of the first accommodating space, the second adhesive being arranged in gaps between the first connecting member and the first accommodating space and between the plurality of wires and the heat sink, and the second adhesive being connected to the first adhesive. The first adhesive at least partially covers the connecting portion and a connection between the first circuit board and the connecting portion. The first adhesive is arranged in gaps between the first connecting member and the wire harness assembly and between the first segments. The first connecting member surrounds the connecting portion when viewed along the first direction. The first connecting member comprises a main body portion comprising a first connecting wall and a second connecting wall arranged along a third direction, and a third connecting wall and a fourth connecting wall arranged along a second direction, the first connecting wall connecting the third connecting wall and the fourth connecting wall, and the second connecting wall connecting the third connecting wall and the fourth connecting wall, the first connecting wall, the second connecting wall, the third connecting wall, and the fourth connecting wall being connected to the first circuit board, the third direction being perpendicular to both the first direction and the second direction. The main body portion is provided with a first opening, the first opening being in communication with the accommodation space, and the second segments extending out of the accommodation space through the first opening. The first circuit board is provided with a second connecting hole, and the first connecting member is provided with a connecting column arranged in the second connecting hole. The battery pack comprises an adhesive member, the first connecting member comprises a first end surface, the first end surface being adhered to the first circuit board through the adhesive member. The first connecting member comprises a third extending portion connected to the first end surface, and the adhesive member is arranged on the first end surface and the third extending portion.

2. The battery pack of claim 1, wherein, ​ 3. The battery pack of claim 2, wherein, ​ 4. The battery pack of claim 1, wherein, ​ 5. The battery pack of claim 1, wherein, ​ 6. The battery pack of claim 5, wherein, ​ 7. The battery pack of claim 1, wherein, ​ 8. The battery pack of claim 1, wherein, ​ 9. The battery pack of claim 8, wherein, ​ 10. The battery pack of claim 8, wherein, The battery pack further comprises an insulating support disposed between the first circuit board and the heat sink, the insulating support being provided with a third opening penetrating the insulating support along the first direction, the first connecting member penetrating the third opening.

11. The battery pack of claim 1, wherein, At least part of the second adhesive is disposed in the first accommodating space, the second adhesive being disposed in gaps between the first connecting member and the first accommodating space and between the plurality of conductive wires and the heat sink.

12. The battery pack of claim 11, wherein, The second adhesive protrudes from a surface of the heat sink away from the first circuit board.

13. The battery pack of claim 12, wherein, The portion of the second adhesive protruding from the heat sink is provided with an inclined surface.

14. The battery pack of claim 1, wherein, The first adhesive has a viscosity less than that of the second adhesive.

15. The battery pack of any one of claims 1-14, wherein, The first adhesive is configured to be formed by curing a flowing first insulating material disposed in the accommodating space.

16. The battery pack of any one of claims 1-14, wherein, The battery pack further comprises a second circuit board, the wiring harness assembly being connected to the second circuit board, the wiring harness assembly being configured to transmit information of the battery cell assembly to the second circuit board.

17. The battery of any one of claims 1-14, wherein, The first circuit board is provided with a hole, the electrode terminal being connected to a side of the first circuit board away from the battery cell housing after penetrating the hole, the first circuit board comprising a conductive wire connecting the connecting portion and the electrode terminal.

18. The battery of claim 1, wherein, The housing assembly comprises a first housing provided with a first opening and a second opening, the heat sink being provided with a first channel communicating the first opening and the second opening.

19. The battery of claim 1, wherein, The second adhesive is configured to be formed by curing a flowing second insulating material disposed in the first accommodating space.

20. An electrical device, comprising: A battery pack as claimed in any one of claims 1-19. A battery pack as claimed in any one of claims 1-19.

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