Battery pack and power consuming device

Abstract

Embodiments of the present application provide a battery pack and an electric device with the battery pack. The battery pack comprises a housing assembly, a first connecting member and a cell assembly. The housing assembly has a first space. The housing assembly is provided with a first opening and a second opening communicating with the first space. The first connecting member is accommodated in the first space. The first connecting member is provided with a first channel. The first opening and the second opening communicate through the first channel. At least part of the cell assembly is arranged in the first space. In a first direction, projections of the first opening and the second opening are separated from a projection of the cell assembly. The first direction is a stacking direction of cells in the cell assembly. Heat of the cell assembly of the battery pack flows in the first channel through external air and is dissipated to the external environment, thereby improving the heat dissipation efficiency of the cell assembly.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery pack and an electrical device. Background Technology

[0002] When a battery pack is in use, it generates a lot of heat. To prevent the battery pack from overheating, it needs to be cooled. The traditional way to cool the battery pack is to add heat sinks between the cells. However, this method is slow and has limited cooling effect on the battery pack. It also affects the battery devices that use the battery pack. Summary of the Invention

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

[0004] Embodiments of this application provide a battery pack, including a housing assembly, a first connector, and a cell assembly. The housing assembly has a first space, and the housing assembly has a first opening and a second opening communicating with the first space. The first connector is accommodated in the first space. The first connector has a first channel. The first opening and the second opening are connected through the first channel. At least a portion of the cell assembly is disposed in the first space. Along a first direction, the projections of the first opening and the second opening are separate from the projection of the cell assembly. The first direction is the stacking direction of the cells in the cell assembly. The heat from the cell assembly of the above-mentioned battery pack flows through the first channel with external air and is dissipated into the external environment, improving the heat dissipation efficiency of the cell assembly.

[0005] Optionally, in some embodiments of this application, the housing assembly includes a first housing. The first housing includes a first wall, a first side wall, a second side wall, a third side wall, and a fourth side wall. The first wall connects the first side wall, the second side wall, the third side wall, and the fourth side wall to form a first space. A first opening is provided in the first side wall. A second opening is provided in the second side wall. The first side wall and the second side wall are arranged along a first direction. The third side wall and the fourth side wall are arranged along a second direction. The first direction is perpendicular to the second direction.

[0006] Optionally, in some embodiments of this application, the projection of the first opening overlaps with the projection of the second opening along the first direction, which can reduce the path of the first channel, allowing external air to pass through the first channel quickly, carrying away the heat of the battery cell assembly and improving heat dissipation efficiency.

[0007] Optionally, in some embodiments of this application, when the projection of the first opening overlaps with the projection of the second opening along the first direction, the distance of the first channel is the shortest and the airflow of the first opening and the second opening is large, further improving heat dissipation.

[0008] Optionally, in some embodiments of this application, the first connector includes a first portion. A first channel is disposed in the first portion. Along the second direction, the first portion is located between the third sidewall and the fourth sidewall, and is thermally connected to the battery cell assembly through the first portion. The heat of the battery cell assembly is transferred to the first portion and dissipated into the external environment through the flow of external air within the first channel, thereby improving the heat dissipation efficiency of the battery cell assembly.

[0009] Optionally, in some embodiments of this application, the first connector includes a second portion connecting the first portion. Along a third direction, the battery cell assembly is located between the first wall and the second portion. This third direction is perpendicular to both the first and second directions. Part of the heat from the battery cell assembly is conducted to the first wall, dissipating some heat to the external environment. Part of the heat from the battery cell assembly is conducted to the second portion, then to the first portion, and finally carried away by the air flowing within the first channel, thus improving heat dissipation.

[0010] Optionally, in some embodiments of this application, the battery cell assembly includes a first column of battery cells. The first column of battery cells includes a plurality of battery cells stacked along a first direction. Each battery cell includes a battery cell housing, an electrode assembly disposed within the battery cell housing, and electrode terminals connected to the electrode assembly and extending from the battery cell housing.

[0011] Optionally, in some embodiments of this application, the battery cell assembly further includes a second column of battery cells. The first column of battery cells and the second column of battery cells are arranged along a second direction. Along the second direction, a first portion is disposed between the first column of battery cells and the second column of battery cells, and the first portion dissipates heat from the first column of battery cells and the second column of battery cells.

[0012] Optionally, in some embodiments of this application, the first part includes a first surface and a second surface disposed along a second direction. Along the second direction, the projection of the first surface overlaps with the projection of the first column of battery cells, and the projection of the second surface overlaps with the projection of the second column of battery cells. Heat is dissipated by conducting heat from the first column of battery cells through the first surface and heat from the second column of battery cells through the second surface.

[0013] Optionally, in some embodiments of this application, along the first direction, the projection of the first column of battery cells is located within the projection of the first surface. The projection of the second column of battery cells is located within the projection of the second surface, so that the sides of the first column of battery cells can conduct heat with the first surface, and the sides of the second column of battery cells can conduct heat with the second surface, further improving heat dissipation.

[0014] Optionally, in some embodiments of this application, thermally conductive adhesive is provided between the first part and the first column of battery cells to facilitate the rapid conduction of heat to the first connector and further improve heat dissipation.

[0015] Optionally, in some embodiments of this application, thermally conductive adhesive is provided between the first part and the second column of battery cells to facilitate the rapid conduction of heat to the first connector and further improve heat dissipation.

[0016] Optionally, in some embodiments of this application, the first connector further includes a third portion. The third portion connects to the first portion. Along the third direction, the first column of battery cells is located between the second portion and the first wall. The second column of battery cells is located between the third portion and the first wall. Some of the heat from the second column of battery cells is conducted to the first wall, and some of the heat is dissipated to the external environment through the first wall. Some of the heat from the second column of battery cells is conducted to the third portion, and then conducted to the first portion. The heat on the first portion is then carried away by the air flowing in the first channel, thus improving heat dissipation.

[0017] Optionally, in some embodiments of this application, the first portion further includes a second channel. The second channel extends through the first portion along a first direction. The first channel and the second channel are spaced apart along a third direction. By providing the second channel, the first channel and the second channel can work together to dissipate heat from the battery cell, further improving heat dissipation efficiency.

[0018] Optionally, in some embodiments of this application, the battery pack further includes a first conductive element. A second portion has a first notch. A third portion has a second notch. One end of the first conductive element is connected to a first column of battery cells, and the other end is connected to a second column of battery cells. A portion of the first conductive element passes through the first notch, and a portion of the first conductive element passes through the second notch.

[0019] Optionally, in some embodiments of this application, a first insulating member and a first adapter plate are further included. The first adapter plate connects to the electrode terminals. The first insulating member is disposed on the side of the first adapter plate opposite to the cell assembly. Along a second direction, the projection of the first adapter plate overlaps with the projection of the first insulating member. The projection of the electrode terminals overlaps with the projection of the first insulating member, providing insulation protection for the first conductive sheet and the electrode terminals.

[0020] Optionally, in some embodiments of this application, a first thermally conductive layer is provided between the first adapter plate and the battery cell housing. Along the first direction, the projection of the electrode terminal overlaps with the projection of the first thermally conductive layer, and the first thermally conductive layer fixes, insulates, and conducts heat to the electrode terminals between the battery cell housing and the first adapter plate.

[0021] Optionally, in some embodiments of this application, a second thermally conductive layer is provided between the first insulating member and the first adapter plate. Along the first direction, the projection of the electrode terminal overlaps with the projection of the second thermally conductive layer, and the second thermally conductive layer fixes, insulates, and conducts heat to the welding part, the first conductive member, and the first conductive sheet.

[0022] Optionally, in some embodiments of this application, the first thermally conductive layer and the second thermally conductive layer are made of the same material, and the first thermally conductive layer and the second thermally conductive layer are formed after the flowing insulating material is poured in and cured.

[0023] Optionally, in some embodiments of this application, the second portion is located on the side of the first insulating member facing away from the first adapter plate. A third thermally conductive layer is provided between the second portion and the first insulating member. The heat is transferred from the second thermally conductive layer to the third thermally conductive layer, and then from the third thermally conductive layer to the first connector. The first connector then dissipates heat from the first row of battery cells. By adding the third thermally conductive layer, the efficiency of heat transfer from the battery cells to the first connector can be improved.

[0024] An embodiment of this application also provides an electrical device, including the battery pack in any of the above embodiments.

[0025] The heat from the battery pack and the cell components of the electrical equipment flows through the external air in the first channel and is dissipated into the external environment, thereby improving the heat dissipation efficiency of the cell components. Attached Figure Description

[0026] Figure 1 Schematic diagrams of the battery pack structure are shown in some embodiments.

[0027] Figure 2 A schematic diagram of the battery pack from another perspective is shown in some embodiments.

[0028] Figure 3 An exploded schematic diagram of the battery pack is shown in some embodiments.

[0029] Figure 4 An exploded schematic diagram of the housing assembly is shown in some embodiments.

[0030] Figure 5 A cross-sectional schematic diagram of the housing assembly is shown in some embodiments.

[0031] Figure 6 It shows Figure 1 A cross-sectional view of the battery pack along II-II.

[0032] Figure 7 A schematic diagram of the structure of the first column of battery cells and the first adapter plate in some embodiments is shown.

[0033] Figure 8 Schematic diagrams of the battery cell structure are shown in some embodiments.

[0034] Figure 9 An exploded view of the battery cell is shown in some embodiments.

[0035] Figure 10 Schematic diagrams of the battery pack structure after removing the housing assembly are shown in some embodiments.

[0036] Figure 11 It shows Figure 10 A schematic diagram of the battery pack structure excluding the first connector.

[0037] Figure 12 An exploded view of the battery pack after removing the housing assembly is shown in some embodiments.

[0038] Figure 13 A schematic diagram of the structure of the first insulating element in some embodiments is shown.

[0039] Figure 14 A schematic diagram of the structure of the second insulating element in some embodiments is shown.

[0040] Figure 15 It shows Figure 1 A cross-sectional view of the battery pack along line III-III.

[0041] Figure 16 It shows Figure 15 Enlarged diagram of section IV.

[0042] Figure 17 A cross-sectional schematic diagram of the battery pack along III-III is shown in some other embodiments.

[0043] Figure 18 It shows Figure 17 An enlarged diagram of part V.

[0044] Figure 19 A schematic diagram of the structure of the first connector in some embodiments is shown.

[0045] Figure 20 A structural schematic diagram of the first connector from another perspective is shown in some embodiments.

[0046] Figure 21 Schematic diagrams of electrical equipment in some embodiments are shown.

[0047] Explanation of key component symbols:

[0048] Battery pack 100

[0049] Housing assembly 10

[0050] First shell 11

[0051] First opening 11a

[0052] Second opening 11b

[0053] First Wall 111

[0054] First side wall 112

[0055] First connecting hole 1121

[0056] Second side wall 113

[0057] Third side wall 114

[0058] Fourth side wall 115

[0059] Second shell 12

[0060] First hole 12a

[0061] Fixed convex portion 12b

[0062] 1st recessed part 12c

[0063] Second Wall 121

[0064] Fifth side wall 122

[0065] Third opening 122a

[0066] Sixth side wall 123

[0067] Fourth opening 123a

[0068] Seventh side wall 124

[0069] Eighth side wall 125

[0070] Third shell 13

[0071] Bracket 14

[0072] Seal 15

[0073] Groove 151

[0074] First sealing part 15a

[0075] Second sealing part 15b

[0076] Third sealing part 15c

[0077] Battery cell assembly 20

[0078] First cell group 20a

[0079] Second cell group 20b

[0080] Cell 21

[0081] First side view 21a

[0082] Second side 21b

[0083] Third side 21c

[0084] Fourth side 21d

[0085] Fifth side 21e

[0086] Sixth side 21f

[0087] Cell casing 211

[0088] Part 1 211a

[0089] Part 211b

[0090] First outer shell 2111

[0091] Second outer shell 2112

[0092] First extension 2113

[0093] Second extension 2114

[0094] First sealing part 2115

[0095] Second sealing part 2116

[0096] Electrode assembly 212

[0097] Electrode terminal 213

[0098] Welding part 213a

[0099] First terminal 213b

[0100] Second terminal 213c

[0101] First heat-conducting component 22a

[0102] Second heat-conducting component 22b

[0103] Elastic element 23

[0104] First conductive element 24

[0105] Second recess 241

[0106] First connector 30

[0107] First Channel 30a

[0108] Second connecting hole 30b

[0109] Second channel 30c

[0110] Part 1, Chapter 31

[0111] First surface 311

[0112] Second surface 312

[0113] Part 2, 32

[0114] First gap 321

[0115] Part 33

[0116] Second gap 331

[0117] Circuit board 40

[0118] First adapter board 50

[0119] Hole 51

[0120] First connecting hole 511

[0121] Second connecting hole 512

[0122] Third connecting hole 513

[0123] First conductive sheet 52

[0124] First electrical connection part 53

[0125] First conductive part 531

[0126] First insulating part 532

[0127] First sampling harness 54

[0128] First insulating component 60

[0129] First subject 61

[0130] First through hole 61a

[0131] First bump 61b

[0132] Fifth opening 611

[0133] first convex portion 612

[0134] Sixth opening 613

[0135] Second convex portion 614

[0136] Seventh opening 615

[0137] Third convex portion 616

[0138] First heat-conducting layer 101

[0139] Second thermal conductive layer 102

[0140] First side plate 62

[0141] Second adapter board 70

[0142] Second conductive sheet 71

[0143] Second electrical connection part 72

[0144] Second conductive part 721

[0145] Second insulating part 722

[0146] Second sampling harness 73

[0147] Second insulating component 80

[0148] Second subject 81

[0149] Second through hole 81a

[0150] Second bump 81b

[0151] Eighth opening 811

[0152] Fourth convex part 812

[0153] Ninth opening 813

[0154] Fifth convex portion 814

[0155] The tenth opening 815

[0156] Sixth convex part 816

[0157] Second side panel 82

[0158] First direction X

[0159] Second direction Y

[0160] Third direction Z

[0161] The following specific embodiments will further illustrate this application in conjunction with the above-described accompanying drawings. Detailed Implementation

[0162] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0163] 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.

[0164] It's understandable that the term "perpendicular" 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 perpendicular. 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 straight or plane, the component can be considered a "straight line" or "plane."

[0165] 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.

[0166] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0167] Embodiments of this application provide a battery pack, including a housing assembly, a first connector, and a cell assembly. The housing assembly has a first space, and the housing assembly has a first opening and a second opening communicating with the first space. The first connector is accommodated in the first space. The first connector has a first channel. The first opening and the second opening are connected through the first channel. At least a portion of the cell assembly is disposed in the first space. Along a first direction, the projections of the first opening and the second opening are separate from the projection of the cell assembly. The first direction is the stacking direction of the cells in the cell assembly. The heat from the cell assembly of the above-mentioned battery pack flows through the first channel with external air and is dissipated into the external environment, improving the heat dissipation efficiency of the cell assembly.

[0168] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0169] Please see Figures 1-5This application provides a battery pack 100, including a housing assembly 10, a cell assembly 20, and a first connector 30. The housing assembly 10 has a first space, within which the cell assembly 20 and the first connector 30 are both disposed. The housing assembly 10 also has a first opening 11a and a second opening 11b communicating with the first space. The first connector 30 has a first channel 30a, one end of which is connected to the first opening 11a, and the other end is connected to the second opening 11b. A portion of the cell assembly 20 faces the first connector 30, allowing heat dissipation through the first connector 30. External air can enter the first channel 30a through the first opening 11a and exit through the second opening 11b, or vice versa. Some of the heat from the cell assembly 20 flows through the external air within the first channel 30a and dissipates into the external environment. The remaining portion faces the inner wall of the housing assembly 10, and some of the heat is dissipated to the external environment through the inner wall of the housing assembly 10, thereby enabling each surface of the battery cell assembly 20 to transfer heat to the outside world and improving the heat dissipation efficiency of the battery cell assembly 20.

[0170] In one embodiment, the battery pack 100 can utilize external air to dissipate heat from the cell assembly 20 through airflow. In another embodiment, when the battery pack 100 is static, such as during charging, it can utilize natural wind or external air-cooling equipment for heat dissipation. In yet another embodiment, the battery pack 100 can be used in devices that are in motion, such as drones or electric bicycles, where the faster airflow during movement allows for rapid heat dissipation of the battery pack 100.

[0171] Please see Figure 3 , Figure 4 , Figure 5 and Figure 6 In one embodiment, the housing assembly 10 includes a first housing 11, which has a first space. The first housing 11 includes a first wall 111, a first side wall 112, a second side wall 113, a third side wall 114, and a fourth side wall 115. The first side wall 112 and the second side wall 113 are both connected to the first wall 111 and are arranged in an arranged manner. The third side wall 114 and the fourth side wall 115 are both connected to the first wall 111 and are arranged in an arranged manner. The third side wall 114 is also connected to the first side wall 112 and the second side wall 113, and the fourth side wall 115 is also connected to the third side wall 114 and the fourth side wall 115, thus forming the first space.

[0172] In one embodiment, the first housing 11 and the first connector 30 comprise a thermally conductive material to improve heat dissipation performance. Optionally, the first housing 11 and the first connector 30 comprise 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 and the first connector 30 comprises aluminum. Optionally, the first housing 11 and the first connector 30 are made of a metallic material.

[0173] 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 direction in which the first sidewall 112 and the second sidewall 113 are arranged. The second direction Y is the direction in which the third sidewall 114 and the fourth sidewall 115 are arranged. The third direction Z is the direction perpendicular to the surface of the first wall 111. The first direction X is also perpendicular to both the second direction Y and the third direction Z.

[0174] In one embodiment, the first opening 11a penetrates the first sidewall 112, and the second opening 11b penetrates the second sidewall 113. In one embodiment, the projections of the first opening 11a and the second opening 11b overlap along the first direction X. Optionally, the projections of the first opening 11a and the second opening 11b partially overlap along the first direction X. Optionally, the projections of the first opening 11a and the second opening 11b overlap along the first direction X. The first sidewall 112 is connected to the first connector 30, and the second sidewall 113 is connected to the first connector 30, so that one end of the first channel 30a is connected to the first opening 11a, and the other end is connected to the second opening 11b. When the projections of the first opening 11a and the second opening 11b overlap along the first direction X, the distance of the first channel 30a is the shortest, and the airflow of the first opening 11a and the second opening 11b is large, further improving heat dissipation. When the battery pack 100 moves in the opposite direction to the first direction X, or when the airflow from the external air-cooling device is in the same direction as the first direction X, the first opening 11a serves as an air inlet, and the second opening 11b serves as an air outlet. Air enters through the first opening 11a, passes through the first channel 30a, and exits through the second opening 11b, thus improving heat dissipation. It can be understood that when the battery pack 100 moves in the first direction X, or when the airflow from the external air-cooling device is in the opposite direction to the first direction X, the second opening 11b serves as an air inlet, and the first opening 11a serves as an air outlet. In another embodiment, the first opening 11a is located on the third side wall 114, and the second opening 11b is located on the fourth side wall 115.

[0175] In another embodiment (not shown), a first opening 11a penetrates the first wall 111, and a second opening 11b penetrates the first side wall 112 and the second side wall 113. One end of a first channel 30a is connected to the first opening 11a, and the other end is connected to the second opening 11b on the first side wall 112 and the second opening 11b on the second side wall 113. Air can enter from the first opening 11a on the first wall 111, pass through the first channel 30a, and exit from the second opening 11b on the first side wall 112 and the second opening 11b on the second side wall 113. By increasing the number of air outlets, the airflow is increased, thus improving heat dissipation. Air can also enter from one of the second openings 11b on the first side wall 112 and the second opening 11b on the second side wall 113, and exit from the other second opening 11b and the first opening 11a, further improving heat dissipation.

[0176] In one embodiment, the first sidewall 112 and the second sidewall 113 are provided with a plurality of first connecting holes 1121, and the two sides of the first connector 30 along the first direction X are provided with a plurality of second connecting holes 30b. Fasteners (not shown), such as screws, pass through the first connecting holes 1121 and the second connecting holes 30b to fix the first connector 30 to the first sidewall 112 and the second sidewall 113.

[0177] In one embodiment, the housing assembly 10 further includes a second housing 12 having a second space. The first housing 11 is disposed within the second housing 12. The second housing 12 is used to improve the impact resistance of the battery pack 100 and reduce the risk of the first housing 11 deforming and puncturing the cell assembly 20 after being impacted. Optionally, the second housing 12 includes a plastic housing. Optionally, the second housing 12 is formed by injection molding.

[0178] In one embodiment, the second housing 12 includes a second wall 121, a fifth side wall 122, a sixth side wall 123, a seventh side wall 124, and an eighth side wall 125. The fifth side wall 122 and the sixth side wall 123 are both connected to the second wall 121 and are arranged along a first direction X. The seventh side wall 124 and the eighth side wall 125 are both connected to the second wall 121 and are arranged along a second direction Y. The seventh side wall 124 is also connected to the fifth side wall 122 and the sixth side wall 123, and the eighth side wall 125 is also connected to the fifth side wall 122 and the sixth side wall 123, forming a second space. At least one of the second wall 121, the fifth side wall 122, the sixth side wall 123, the seventh side wall 124, and the eighth side wall 125 is provided with a first hole 12a, through which the first housing 11 is exposed for heat dissipation. Optionally, the second wall 121, the fifth side wall 122, the sixth side wall 123, the seventh side wall 124, and the eighth side wall 125 are all provided with first holes 12a to improve heat dissipation. Furthermore, the multiple first holes 12a make the second housing 12 resemble a mesh, reducing the material consumption of the second housing 12 and thus lightening its weight, making the battery pack 100 lighter. It is understood that the second housing 12 itself can also dissipate heat from the first housing 11.

[0179] In one embodiment, the fifth sidewall 122 is provided with a third opening 122a, and the sixth sidewall 123 is provided with a fourth opening 123a. Along the first direction X, the projections of the third opening 122a and the fourth opening 123a overlap with the projection of the first channel 30a. Along the first direction X, the projection of the first opening 11a overlaps with the projection of the third opening 122a. Optionally, the overlap of the projections of the first opening 11a and the third opening 122a can increase the amount of air entering and exiting. Along the first direction X, the projection of the second opening 11b overlaps with the projection of the fourth opening 123a. Optionally, the overlap of the projections of the second opening 11b and the fourth opening 123a can increase the amount of air entering and exiting. Taking the battery pack 100 moving in the opposite direction to the first direction X or the airflow of the external air-cooling device along the first direction X as an example, air enters the first channel 30a through the third opening 122a and the first opening 11a, and is discharged through the second opening 11b and the fourth opening 123a.

[0180] In one embodiment, the first housing 11 and the second housing 12 are connected by a gap or an interference fit, so that the outer surface of the first housing 11 fits the inner surface of the second housing 12, which facilitates fixing the first housing 11.

[0181] In one embodiment, the housing assembly 10 further includes a third housing 13 and a bracket 14. The bracket 14 connects the first housing 11 and the second housing 12, and the third housing 13 connects to the bracket 14, thereby enclosing the first housing 11 within the second housing 12. A fixing protrusion 12b is provided at the connection between the seventh sidewall 124 and the fifth sidewall 122, at the connection between the seventh sidewall 124 and the sixth sidewall 123, at the connection between the eighth sidewall 125 and the fifth sidewall 122, and at the connection between the eighth sidewall 125 and the sixth sidewall 123. The bracket 14 connects the first sidewall 112, the second sidewall 113, the third sidewall 114, and the fourth sidewall 115, and the bracket 14 and the first wall 111 are arranged in a third direction Z. The bracket 14 is fixedly connected to the fixing protrusion 12b by fasteners to confine the first housing 11 within the second housing 12. The third housing 13 is fixedly connected to the side of the bracket 14 opposite to the second housing 12. When the second housing 12 and / or the third housing 13 need to be replaced, the second housing 12 and / or the third housing 13 can be disassembled and replaced by loosening the fasteners.

[0182] In one embodiment, the battery pack 100 further includes a circuit board 40 disposed within the third housing 13. The circuit board 40 is electrically connected to the cell assembly 20. Optionally, the circuit board 40 includes a Battery Management System (BMS) assembly. Specifically, the BMS assembly includes multiple electronic components capable of performing functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery.

[0183] In one embodiment, the housing assembly 10 further includes a seal 15, which connects the sides of the first sidewall 112, second sidewall 113, third sidewall 114, and fourth sidewall 115 opposite to the first wall 111. When the bracket 14 is fixedly connected to the second housing 12, the bracket 14 presses against the seal 15 along the third direction Z. Optionally, the seal 15 has a closed-loop structure and a groove 151, in which the sides of the first sidewall 112, second sidewall 113, third sidewall 114, and fourth sidewall 115 opposite to the first wall 111 are all located. Along the first direction X, the projections of the first sidewall 112 and second sidewall 113 overlap with the projection of the seal 15. Along the second direction Y, the projections of the third sidewall 114 and fourth sidewall 115 overlap with the projection of the seal 15.

[0184] In one embodiment, the seal 15 includes a first sealing portion 15a, a second sealing portion 15b, and a third sealing portion 15c. The first sealing portion 15a is disposed between the inner surface of the first housing 11 and the bracket 14. The second sealing portion 15b is disposed between the outer surface of the first housing 11 and the inner surface of the second housing 12. The third sealing portion 15c connects the first sealing portion 15a and the second sealing portion 15b, and is located between the bracket 14 and the first housing 11. The bracket 14 can contact and connect with the third sealing portion 15c.

[0185] In one embodiment, a first adhesive layer (not shown) is provided between the first sealing portion 15a and the inner surface of the first housing 11, and a first adhesive layer is provided between the second sealing portion 15b and the outer surface of the first housing 11. The sealing element 15 is bonded and fixed to the first housing 11 by the first adhesive layer. Optionally, the first adhesive layer includes sealant. A second adhesive layer (not shown) is provided between the first sealing portion 15a and the bracket 14, a second adhesive layer is provided between the second sealing portion 15b and the inner surface of the second housing 12, and a second adhesive layer is provided between the third sealing portion 15c and the bracket 14. Optionally, the second adhesive layer includes sealant. By providing the second adhesive layer, the connection between the bracket 14 and the second housing 12 and the sealing element 15 is strengthened, reducing the risk of moisture and other impurities entering the first housing 11 and causing a short circuit in the battery.

[0186] In one embodiment, the fifth sidewall 122, the sixth sidewall 123, the seventh sidewall 124, and the eighth sidewall 125 each have a first recess 12c at their ends opposite to the second wall 121. A second sealing portion 15b is disposed within the first recess 12c. By placing the second sealing portion 15b within the first recess 12c, the extension path of the gap between the second sealing portion 15b and the sidewall of the second housing 12 is increased, reducing the entry of moisture into the first housing 11 and further reducing the risk of battery short circuit. Taking the sixth sidewall 123 as an example, the end of the sixth sidewall 123 opposite to the second wall 121 is recessed along the first direction X to form the first recess 12c. Along the second direction Y, the projection of the second sealing portion 15b overlaps with the projection of the first recess 12c. Optionally, the projection of the second sealing portion 15b is located within the projection of the first recess 12c. It is understood that the depth of the first recess 12c along the first direction X can be an increased extension path.

[0187] Please see Figures 6-10In one embodiment, along a first direction X, a first opening 11a and a second opening 11b are disposed on both sides of the cell assembly 20. The cell assembly 20 includes a first column of cells 20a. The first column of cells 20a is disposed between a first sidewall 112 and a second sidewall 113, and between a third sidewall 114 and a portion of the first connector 30. The first column of cells 20a is also disposed between a first wall 111 and a portion of the first connector 30. The first column of cells 20a includes a plurality of cells 21 stacked along the first direction X. 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. In one embodiment, the 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.

[0188] 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 recess for placing the electrode assembly 212. The first outer shell 2111 and the second outer shell 2112 can be folded along the connection position (dashed line position) so that the first outer shell 2111 and the second outer shell 2112 overlap to form a first part 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 part 211b. 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 arranged along the second direction Y. 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 not integrally formed. The second part 211b includes two first sealing portions 2115, which are arranged in a third direction Z. The battery cell 21 includes two electrode terminals 213, one of which extends from one of the first sealing portions 2115 out of the battery cell housing 211, and the other electrode terminal 213 extends from the other first sealing portion 2115 out of the battery cell housing 211. The two electrode terminals 213 are arranged in a third direction Z.

[0189] 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, with the positive electrode sheet, separator, and negative electrode sheet sequentially stacked to form an electrode assembly unit, and multiple electrode assembly units further 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.

[0190] 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. In another 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 of the first terminal 213b and the second terminal 213c 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 towards 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, and the adjacent cells 21 are connected in series. By connecting the weld portions 213a of adjacent cells 21 to each other, the number of processing steps is reduced. In other embodiments, adjacent cells 21 may be connected in parallel.

[0191] In one embodiment, taking a single battery cell 21 as an example, the battery cell 21 includes a first side 21a, a second side 21b, a third side 21c, a fourth side 21d, a fifth side 21e, and a sixth side 21f. The first side 21a and the second side 21b are arranged along a first direction X. The third side 21c and the fourth side 21d are arranged along a second direction Y. The fifth side 21e and the sixth side 21f are arranged along a third direction Z, and an electrode terminal 213 extends from the fifth side 21e. In one embodiment, the first side 21a faces the first sidewall 112, the second side 21b faces the second sidewall 113, the third side 21c faces the third sidewall 114, the fourth side 21d faces a portion of the first connector 30, the fifth side 21e faces another portion of the first connector 30, and the sixth side 21f faces the first wall 111. By allowing heat transfer between the first side 21a, second side 21b, third side 21c, fourth side 21d, fifth side 21e, and sixth side 21f of the battery cell 21 and the external environment, heat dissipation of the battery cell assembly 20 is improved, and the temperature of the battery pack 100 is reduced. It is understood that the above method also applies to the case of multiple battery cells 21.

[0192] In one embodiment, the first battery cell group 20a further includes a first heat-conducting element 22a. Each battery cell 21 is thermally connected to at least one first heat-conducting element 22a. The first heat-conducting element 22a is thermally connected to the first housing 11 and the first connector 30, transferring heat from the battery cell 21 to the first housing 11 and the first connector 30, and then dissipating heat from the battery cell 21 through the first housing 11 and the first connector 30. The first heat-conducting element 22a is connected to the first side 21a or the second side 21b and extends to the third side 21c, the fourth side 21d, and the sixth side 21f after bending. The first heat-conducting element 22a located on the first side 21a is thermally connected to the first sidewall 112. The first heat-conducting element 22a located on the second side 21b is thermally connected to the second sidewall 113. The first heat-conducting element 22a located on the third side 21c is thermally connected to the third sidewall 114. The first heat-conducting element 22a located on the fourth side 21d is thermally connected to the surface of the first connector 30. The first heat-conducting element 22a, located on the sixth side 21f, is thermally connected to the surface of the first wall 111. Through the first heat-conducting element 22a, heat from the battery cell 21 is transferred to the first connector 30 and the first housing 11, improving the heat dissipation effect on the battery cell 21. In another embodiment, the first heat-conducting element 22a does not need to extend to the fourth side 21d; the fourth side 21d is directly thermally connected to the first connector 30. This thermal connection can be achieved through thermally conductive adhesive or similar means. Alternatively, the thermal connection can be a direct contact connection between two structural components, for example, the first heat-conducting element 22a can be in contact with the first housing 11 and the first connector 30. Optionally, the first heat-conducting element 22a may include an aluminum sheet.

[0193] In one embodiment, an elastic element 23 is also provided between adjacent first heat-conducting elements 22a. When the battery cell 21 expands, the elastic element 23 can be compressed to provide expansion space for the battery cell 21. Optionally, the elastic element 23 includes foam.

[0194] In one embodiment, the battery cell assembly 20 further includes a second column of battery cells 20b, with the first column of battery cells 20a and the second column of battery cells 20b arranged along a second direction Y. Along the second direction Y, a first connector 30 is disposed between the first column of battery cells 20a and the second column of battery cells 20b. The second column of battery cells 20b is disposed between a portion of the first connector 30 and a fourth sidewall 115, and between the first sidewall 112 and the second sidewall 113. The second column of battery cells 20b is also disposed between the first wall 111 and a portion of the first connector 30. In one embodiment, the first connector 30 thermally connects the first column of battery cells 20a and the second column of battery cells 20b, enabling simultaneous heat transfer from both columns to the first connector 30 and rapid heat dissipation through the first channel 30a.

[0195] In one embodiment, the cells 21 of the second cell group 20b have the same structure as the cells 21 of the first cell group 20a. The second cell group 20b includes a plurality of cells 21 stacked along a first direction X, and each cell 21 is in contact with the first connector 30 and the first housing 11.

[0196] In one embodiment, the second cell assembly 20b further includes a second heat-conducting element 22b, which has a substantially similar structure to the first heat-conducting element 22a. Optionally, a first connector 30 connects to the first heat-conducting element 22a and the second heat-conducting element 22b, and is located between the first heat-conducting element 22a and the second heat-conducting element 22b to improve heat dissipation of the cell assembly 20.

[0197] In one embodiment, please refer to Figure 12 In one embodiment, the battery pack 100 further includes a first conductive member 24. One end of the first conductive member 24 is connected to a first column of battery cells 20a, and the other end is connected to a second column of battery cells 20b. Optionally, one end of the first conductive member 24 is connected to the first terminal 213b of a cell 21 in the first column of battery cells 20a, and the other end is connected to the second terminal 213c of a cell 21 in the second column of battery cells 20b, thereby connecting the first column of battery cells 20a in series. Optionally, one end of the first conductive member 24 is connected to the first terminal 213b of a cell 21 in the first column of battery cells 20a, and the other end is connected to the first terminal 213b of a cell 21 in the second column of battery cells 20b, thereby connecting the first column of battery cells 20a in parallel. The first conductive member 24 is provided with a second recess 241, and a first connector 30 is partially disposed within the second recess 241.

[0198] Please see Figure 10 , Figure 11 and Figure 12 In one embodiment, the battery pack 100 further includes a first adapter plate 50, which connects to a first column of battery cells 20a. The first adapter plate 50 has multiple sets of holes 51, each set of holes 51 including a first connecting hole 511 and a second connecting hole 512 disposed along a first direction X. The first connecting hole 511 and the second connecting hole 512 extend along a second direction Y. The first terminal 213b of an adjacent battery cell 21 passes through the first connecting hole 511, and the second terminal 213c of another battery cell 21 passes through the second connecting hole 512. 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 adapter plate 50.

[0199] In one embodiment, the first adapter board 50 includes a circuit board. Optionally, the first adapter board 50 includes a printed circuit board (PCB), and multiple conductors (not shown) are disposed on the first adapter board 50. Optionally, the first adapter board 50 includes a flexible printed circuit board (FPC).

[0200] Optionally, the first adapter plate 50 has a plurality of first conductive sheets 52 on the side opposite to the battery cell 21. The first conductive sheets 52 are disposed between the first connecting hole 511 and the second connecting hole 512. The first terminal 213b of an adjacent battery cell 21 passes through the first connecting hole 511, and the second terminal 213c of another battery cell 21 passes through the second connecting hole 512. 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 52. Welding includes laser welding, ultrasonic welding, etc. In other embodiments, the welding portion 213a and the first conductive sheet 52 can also be connected by other methods such as conductive adhesive.

[0201] Optionally, each group of holes 51 also includes a third connecting hole 513, which is located between adjacent first conductive sheets 52 when viewed along the third direction Z.

[0202] In one embodiment, the battery pack 100 further includes a first electrical connection portion 53 connected to the first adapter plate 50. The first electrical connection portion 53 includes a first conductive portion 531 and a first insulating portion 532. The first insulating portion 532 is sleeved on the first conductive portion 531, and both ends of the first conductive portion 531 extend out of the first insulating portion 532. One end of the first conductive portion 531 is connected to a first conductive sheet 52, and the other end is connected to the circuit board 40. In one embodiment, the first conductive portion 531 and the first conductive sheet 52 are an integral structure. In one embodiment, the first adapter plate 50 is also provided with a first sampling harness 54, which is connected to the circuit board 40. The first sampling harness 54 can collect information such as current, voltage, and temperature of the battery cell 21.

[0203] Please see Figure 12 , Figure 13 and Figure 14In one embodiment, the battery pack 100 further includes a first insulating member 60, which is disposed on the side of the first conductive sheet 52 opposite to the cell 21, providing insulation protection for the first conductive sheet 52 and the electrode terminal 213. The first insulating member 60 includes a first body 61 and a first side plate 62 extending from the edge of the first body 61. Along the third direction Z, the projection of the first adapter plate 50 overlaps with the projection of the first body 61. Optionally, the projection of the first adapter plate 50 is located within the projection of the first body 61, such that the first body 61 covers the first conductive sheet 52 and the electrode terminal 213. Along the first direction X or the second direction Y, the projection of the first side plate 62 overlaps with the projection of the first adapter plate 50. Further, along the first direction X or the second direction Y, the projection of the first conductive sheet 52 is located within the projection of the first side plate 62.

[0204] In one embodiment, the first body 61 has a fifth opening 611 extending through the surface of the first body 61 along the third direction Z. The first electrical connection portion 53 extends through the fifth opening 611 to the side of the first body 61 away from the first adapter plate 50. Optionally, the first body 61 has a first protrusion 612 located at the edge of the fifth opening 611, which limits the first electrical connection portion 53. Along the second direction Y, the projection of the first conductive portion 531 lies within the projection of the first protrusion 612. The first protrusion 612 insulates the end of the first conductive portion 531 extending beyond the first insulating portion 532, reducing the risk of short circuits in the portion of the first conductive portion 531 extending beyond the first insulating portion 532. Optionally, along the second direction Y, the projection of the first insulating portion 532 overlaps with the projection of the first protrusion 612, further improving the insulation of the extended portion of the first conductive portion 531.

[0205] In one embodiment, the first body 61 has a sixth opening 613 extending through the surface of the first body 61 along the third direction Z. The first conductive element 24 passes through the sixth opening 613 and connects to the first conductive sheet 52. Optionally, the first body 61 has a second protrusion 614 located at the edge of the sixth opening 613. Along the second direction Y, the projection of the first conductive element 24 overlaps with the projection of the second protrusion 614, thus limiting and insulating the first conductive element 24. Along the second direction Y, a portion of the structure of the second protrusion 614 is located between the first conductive element 24 and the first connector 30, reducing the risk of a short circuit between the first conductive element 24 and the first connector 30.

[0206] In one embodiment, the first body 61 has a seventh opening 615 that penetrates the surface of the first body 61. The edge of the seventh opening 615 has a third protrusion 616. The first sampling harness 54 passes through the seventh opening 615, passes through the first body 61, and is connected to the circuit board 40.

[0207] Please see Figure 12 , Figures 15-18 In one embodiment, a first thermally conductive layer 101 is provided between the battery cell housing 211 and the first adapter plate 50. Along the first direction X, the projection of the electrode terminal 213 overlaps with the projection of the first thermally conductive layer 101, thereby fixing, insulating, and conducting heat to the electrode terminal 213 between the battery cell housing 211 and the first adapter plate 50 through the first thermally conductive layer 101.

[0208] In one embodiment, the first thermally conductive layer 101 is formed by injecting insulating material into the battery pack 100 and then curing it. Optionally, the first thermally conductive layer 101 includes at least one of potting compound and foaming compound. Optionally, the first thermally conductive layer 101 is formed by injecting potting compound into the battery pack 100 and then curing it. Optionally, the first thermally conductive layer 101 is formed by foaming with foaming compound. Optionally, the first thermally conductive layer 101 includes resin, which is melted by heating and then poured into the cell housing 211 and the first adapter plate 50 and then cured. Optionally, the first thermally conductive layer 101 is formed by injection molding, whereby the flowable resin is placed between the cell housing 211 and the first adapter plate 50 and then cured. The first thermally conductive layer 101 fills the gap between the cell housing 211 and the first adapter plate 50, strengthens the insulation protection between the electrode terminal 213 and the first adapter plate 50, and restricts foreign objects such as water and dust from entering between the cell housing 211 and the first adapter plate 50.

[0209] In one embodiment, a second heat-conducting layer 102 is provided between the first insulating member 60 and the first adapter plate 50. Along the first direction X, the projection of the welding portion 213a of the electrode terminal 213 overlaps with the projection of the second heat-conducting layer 102, the projection of the first conductive sheet 52 overlaps with the projection of the second heat-conducting layer 102, and the projection of the first conductive member 24 overlaps with the projection of the second heat-conducting layer 102. The welding portion 213a, the first conductive member 24, and the first conductive sheet 52 are fixed, insulated, and heat-conducted by the second heat-conducting layer 102.

[0210] In one embodiment, the second thermally conductive layer 102 is formed by injecting insulating material into the battery pack 100 and then curing it. Optionally, the second thermally conductive layer 102 includes at least one of potting compound and foaming compound. Optionally, the second thermally conductive layer 102 is formed by injecting potting compound into the battery pack 100 and then curing it. Optionally, the second thermally conductive layer 102 is formed by foaming foaming compound. Optionally, the second thermally conductive layer 102 includes resin, which is melted by heating and then poured into the space between the first insulating member 60 and the first adapter plate 50 and then cured. Optionally, the second thermally conductive layer 102 is formed by using an injection molding process to place the flowable resin between the cell housing 211 and the first adapter plate 50 and then curing it. The second thermally conductive layer 102 fills the gap between the first insulating member 60 and the first adapter plate 50, strengthens the insulation protection of the first insulating member 60 and the first adapter plate 50, and restricts the entry of foreign matter such as water and dust between the first insulating member 60 and the first adapter plate 50.

[0211] In one embodiment, the first connector 30 is disposed on the side of the first insulator 60 opposite to the first adapter plate 50. The heat from the electrode terminal 213 is transferred through the first thermally conductive layer 101 to the second thermally conductive layer 102, and then from the second thermally conductive layer 102 to the first connector 30. Optionally, a third thermally conductive layer (not shown) is provided between the first insulator 60 and the first connector 30. The heat is transferred from the second thermally conductive layer 102 to the third thermally conductive layer, and then from the third thermally conductive layer to the first connector 30. The first connector 30 then dissipates heat from the first row of battery cells 20a. By adding the third thermally conductive layer, the efficiency of heat transfer from the battery cell 21 to the first connector 30 can be improved. Optionally, the third thermally conductive layer includes thermally conductive adhesive.

[0212] In one embodiment, the first body 61 has a first through hole 61a, which penetrates the first body 61. Flowing thermally conductive insulating material flows through the first through hole 61a between the first insulating member 60 and the first connecting member 30. In one embodiment, the insulating material of the third thermally conductive layer is poured into the battery pack 100 and then cured. Optionally, the third thermally conductive layer includes at least one of potting compound and foaming compound. Optionally, the third thermally conductive layer is formed by pouring potting compound into the battery pack 100 and then curing it. Optionally, the third thermally conductive layer is formed by foaming foaming compound. Optionally, the third thermally conductive layer includes resin, which is melted by heating and then poured into the space between the first insulating member 60 and the first connecting member 30, followed by curing. Optionally, the third thermally conductive layer is formed by using an injection molding process to place a flowable resin between the first insulating component 60 and the first connecting component 30 and then curing it. The third thermally conductive layer fills the gap between the first insulating component 60 and the first connecting component 30, strengthens the insulation protection of the first insulating component 60 and the first connecting component 30, and restricts foreign objects such as water and dust from entering between the first insulating component 60 and the first connecting component 30.

[0213] In one embodiment, the first thermally conductive layer 101, the second thermally conductive layer 102, and the third thermally conductive layer are formed by curing the same material. First, a fast-curing, quick-drying insulating material, such as quick-drying adhesive or foam, is injected into the fifth opening 611, the sixth opening 613, and the seventh opening 615. The flow of the insulating material to other locations on the first body 61 is restricted by the first protrusion 612, the second protrusion 614, and the third protrusion 616. The cured insulating material seals the fifth opening 611, the sixth opening 613, and the seventh opening 615, and then the battery pack 100 is assembled. Figure 10 The battery pack 100 is inverted in the opposite direction to the third direction (Z). Then, a flowable insulating material is injected through the potting channel. The insulating material flows between the cell housing 211 and the first adapter plate 50, and can flow through the first connecting hole 511, the second connecting hole 512, and the third connecting hole 513 to the space between the first insulating member 60 and the first adapter plate 50. It can also flow through the first through hole 61a into the space between the first insulating member 60 and the first connector 30. After curing, the flowable insulating material between the first insulating member 60 and the first connector 30 forms a third thermally conductive layer; after curing, the flowable insulating material between the first insulating member 60 and the first adapter plate 50 forms a second thermally conductive layer 102; and after curing, the flowable insulating material between the cell housing 211 and the first adapter plate 50 forms a first thermally conductive layer 101. Optionally, when the battery pack 100 is inverted, the gap between the cells 21 can be used as a potting channel. When injecting flowable insulating material through the potting channel, the first thermally conductive layer 101, the second thermally conductive layer 102, and the third thermally conductive layer use the same insulating material. The first thermally conductive layer 101, the second thermally conductive layer 102, and the third thermally conductive layer are formed through a single injection process, which facilitates production.

[0214] In one embodiment, along the third direction Z, the projection of the first through hole 61a overlaps with the projection of the electrode terminal 213, which facilitates the flow of thermally conductive insulating material from the first through hole 61a between the first insulating member 60 and the first connecting member 30.

[0215] In one embodiment, a first protrusion 61b is provided on the side of the first main body 61 facing the first adapter plate 50. When the first insulating member 60 is connected to the first adapter plate 50, the first protrusion 61b can contact and connect with the first adapter plate 50. Supported by the first protrusion 61b, a gap is created between the first insulating member 60 and the first adapter plate 50 to accommodate the second heat-conducting layer 102. It is understood that the size of the gap between the first insulating member 60 and the first adapter plate 50 can be adjusted by adjusting the length of the first protrusion 61b along the third direction Z, thereby adjusting the amount of the second heat-conducting layer 102 between the first insulating member 60 and the first adapter plate 50.

[0216] In one embodiment, the battery pack 100 further includes a second adapter plate 70, which connects to the second row of battery cells 20b. The second adapter plate 70 has multiple second conductive sheets 71 on the side opposite to the battery cells 21. The second adapter plate 70 has the same multiple sets of holes as the first adapter plate 50. The first terminal 213b of an adjacent battery cell 21 passes through the second adapter plate 70, and the second terminal 213c of another battery cell 21 passes through the second adapter plate 70. 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 second conductive sheets 71. Welding methods include laser welding, ultrasonic welding, etc. In other embodiments, the welding portions 213a and the second conductive sheets 71 can also be connected by other methods such as conductive adhesive.

[0217] In one embodiment, the second adapter board 70 includes a circuit board. Optionally, the second adapter board 70 includes a printed circuit board (PCB) with multiple conductors (not shown). Optionally, the second adapter board 70 includes a flexible printed circuit board (FPC).

[0218] In one embodiment, the battery pack 100 further includes a second electrical connection portion 72 connected to the second adapter plate 70. The second electrical connection portion 72 includes a second conductive portion 721 and a second insulating portion 722. The second insulating portion 722 is sleeved on the second conductive portion 721, and both ends of the second conductive portion 721 extend out of the second insulating portion 722. One end of the second conductive portion 721 is connected to a second conductive sheet 71, and the other end is connected to the circuit board 40. In one embodiment, the second conductive portion 721 and the second conductive sheet 71 are an integral structure. In one embodiment, the second adapter plate 70 is also provided with a second sampling harness 73, which is connected to the circuit board 40. The second sampling harness 73 can collect information such as current, voltage, and temperature of the battery cell 21.

[0219] In one embodiment, the battery pack 100 further includes a second insulating member 80, which is disposed on the side of the second conductive sheet 71 opposite to the cell 21, providing insulation protection for the second conductive sheet 71 and the electrode terminal 213. The second insulating member 80 includes a second body 81 and a second side plate 82 extending from the edge of the second body 81. Along the third direction Z, the projection of the second adapter plate 70 overlaps with the projection of the second body 81. Optionally, the projection of the second adapter plate 70 is located within the projection of the second body 81, such that the second body 81 covers the second conductive portion 721 and the electrode terminal 213. Along the first direction X or the second direction Y, the projection of the second side plate 82 overlaps with the projection of the second adapter plate 70. Further, along the first direction X or the second direction Y, the projection of the second conductive sheet 71 is located within the projection of the second side plate 82.

[0220] In one embodiment, the second body 81 has an eighth opening 811 extending through the surface of the second body 81 along the third direction Z. The second electrical connection portion 72 extends through the eighth opening 811 to the side of the second body 81 away from the second adapter plate 70. Optionally, the second body 81 has a fourth protrusion 812 located at the edge of the eighth opening 811, which limits the second electrical connection portion 72. Along the second direction Y, the projection of the second conductive portion 721 lies within the projection of the fourth protrusion 812. The fourth protrusion 812 insulates the end of the second conductive portion 721 extending beyond the second insulating portion 722, reducing the risk of short circuits in the portion of the second conductive portion 721 extending beyond the second insulating portion 722. Optionally, along the second direction Y, the projection of the second insulating portion 722 overlaps with the projection of the fourth protrusion 812, further improving the insulation of the extended portion of the second conductive portion 721.

[0221] In one embodiment, the second body 81 has a ninth opening 813 extending through the surface of the second body 81 along the third direction Z. The first conductive element 24 passes through the ninth opening 813 and connects to the second conductive sheet 71. Optionally, the second body 81 has a fifth protrusion 814 located at the edge of the ninth opening 813. Along the second direction Y, the projection of the first conductive element 24 overlaps with the projection of the fifth protrusion 814, thus limiting and insulating the first conductive element 24. Along the second direction Y, a portion of the structure of the fifth protrusion 814 is located between the first conductive element 24 and the first connector 30, reducing the risk of a short circuit between the first conductive element 24 and the first connector 30.

[0222] In one embodiment, the second body 81 has a tenth opening 815 that penetrates the surface of the second body 81. The edge of the tenth opening 815 has a sixth protrusion 816. The second sampling harness 73 passes through the tenth opening 815, passes through the second body 81, and is connected to the circuit board 40.

[0223] In one embodiment, a fourth thermally conductive layer (not shown) is provided between the battery cell housing 211 and the second adapter plate 70. Along the first direction X, the projection of the electrode terminal 213 overlaps with the projection of the fourth thermally conductive layer, which serves to fix, insulate, and conduct heat to the electrode terminal 213 between the battery cell housing 211 and the second adapter plate 70.

[0224] In one embodiment, the fourth thermally conductive layer is formed by injecting insulating material into the battery pack 100 and then curing it. Optionally, the fourth thermally conductive layer includes at least one of potting compound and foaming compound. Optionally, the fourth thermally conductive layer is formed by injecting potting compound into the battery pack 100 and then curing it. Optionally, the fourth thermally conductive layer is formed by foaming foaming compound. Optionally, the fourth thermally conductive layer includes resin, which is melted by heating and then poured into the cell housing 211 and the second adapter plate 70 and then cured. Optionally, the fourth thermally conductive layer is formed by injection molding, where the flowable resin is placed between the cell housing 211 and the second adapter plate 70 and then cured. The fourth thermally conductive layer fills the gap between the cell housing 211 and the second adapter plate 70, strengthens the insulation protection of the electrode terminals 213 and the second adapter plate 70, and restricts the entry of foreign matter such as water and dust between the cell housing 211 and the second adapter plate 70.

[0225] In one embodiment, a fifth thermally conductive layer (not shown) is provided between the second insulating member 80 and the second adapter plate 70. Along the first direction X, the projection of the welding portion 213a of the electrode terminal 213 overlaps with the projection of the fifth thermally conductive layer, the projection of the second conductive sheet 71 overlaps with the projection of the fifth thermally conductive layer, and the projection of the first conductive member 24 overlaps with the projection of the fifth thermally conductive layer. The fifth thermally conductive layer fixes, insulates, and conducts heat to the welding portion 213a, the first conductive member 24, and the second conductive sheet 71.

[0226] In one embodiment, the fifth thermally conductive layer is formed by injecting insulating material into the battery pack 100 and then curing it. Optionally, the fifth thermally conductive layer includes at least one of potting compound and foaming compound. Optionally, the fifth thermally conductive layer is formed by injecting potting compound into the battery pack 100 and then curing it. Optionally, the fifth thermally conductive layer is formed by foaming with foaming compound. Optionally, the fifth thermally conductive layer includes resin, which is melted by heating and then poured into the space between the second insulating member 80 and the second adapter plate 70 and then cured. Optionally, the fifth thermally conductive layer is formed by injection molding, where the flowable resin is placed between the second insulating member 80 and the second adapter plate 70 and then cured. The fifth thermally conductive layer fills the gap between the second insulating member 80 and the second adapter plate 70, strengthens the insulation protection of the second insulating member 80 and the second adapter plate 70, and restricts the entry of water, dust, and other foreign matter between the second insulating member 80 and the second adapter plate 70.

[0227] In one embodiment, the first connector 30 is disposed on the side of the second insulator 80 opposite to the second adapter plate 70. Heat from the electrode terminal 213 is transferred through the fourth thermally conductive layer to the fifth thermally conductive layer, and then from the fifth thermally conductive layer to the first connector 30. Optionally, a sixth thermally conductive layer (not shown) is provided between the second insulator 80 and the first connector 30. Heat from the electrode terminal 213 is transferred through the fourth thermally conductive layer to the fifth thermally conductive layer, then from the fifth thermally conductive layer to the sixth thermally conductive layer, and finally from the sixth thermally conductive layer to the first connector 30. The first connector 30 then dissipates heat from the second row of battery cells 20b. By adding the sixth thermally conductive layer, the efficiency of heat transfer from the battery cell 21 to the first connector 30 can be improved. Optionally, the sixth thermally conductive layer includes thermally conductive adhesive.

[0228] In one embodiment, the second body 81 is provided with a second through hole 81a, which penetrates the second body 81. Flowing thermally conductive insulating material flows through the second through hole 81a between the second insulating member 80 and the first connecting member 30. In one embodiment, the insulating material of the sixth thermally conductive layer is poured into the battery pack 100 and then cured. Optionally, the sixth thermally conductive layer includes at least one of potting compound and foaming compound. Optionally, the sixth thermally conductive layer is formed by pouring potting compound into the battery pack 100 and then curing it. Optionally, the sixth thermally conductive layer is formed by foaming foaming compound. Optionally, the sixth thermally conductive layer includes resin, which is melted by heating and then poured into the space between the second insulating member 80 and the first connecting member 30, followed by curing. Optionally, the sixth thermally conductive layer is formed by using an injection molding process to place a flowable resin between the second insulating component 80 and the first connecting component 30 and then curing it. The sixth thermally conductive layer fills the gap between the second insulating component 80 and the first connecting component 30, strengthens the insulation protection of the second insulating component 80 and the first connecting component 30, and restricts water, dust and other foreign objects from entering between the second insulating component 80 and the first connecting component 30.

[0229] In one embodiment, the fourth, fifth, and sixth thermally conductive layers are formed by curing the same material. First, a fast-curing, quick-drying insulating material, such as quick-drying adhesive or foam, is injected into the eighth opening 811, ninth opening 813, and tenth opening 815. The flow of the insulating material to other locations on the second body 81 is restricted by the fourth protrusion 812, fifth protrusion 814, and sixth protrusion 816. The cured insulating material seals the eighth opening 811, ninth opening 813, and tenth opening 815, and then the battery pack 100 is assembled. Figure 10The battery pack 100 is inverted in the direction opposite to the Z-axis, and then a flowable insulating material is injected through the potting channel. The insulating material flows between the cell housing 211 and the second adapter plate 70, and can flow through holes in the second adapter plate 70 to between the second insulator 80 and the second adapter plate 70, and can flow through the second through hole 81a into the space between the second insulator 80 and the first connector 30. After the flowable insulating material between the second insulator 80 and the first connector 30 cures, it forms a sixth thermally conductive layer; after the flowable insulating material between the second insulator 80 and the second adapter plate 70 cures, it forms a fifth thermally conductive layer; and after the flowable insulating material between the cell housing 211 and the second adapter plate 70 cures, it forms a fourth thermally conductive layer. Optionally, when the battery pack 100 is inverted, the gap between the cells 21 can be used as a potting channel. When injecting the flowable insulating material through the potting channel, the fourth, fifth, and sixth thermally conductive layers use the same insulating material and are formed in a single injection process, which facilitates production.

[0230] In one embodiment, along the third direction Z, the projection of the second through hole 81a overlaps with the projection of the electrode terminal 213, which facilitates the flow of thermally conductive insulating material from the second through hole 81a between the second insulating member 80 and the first connecting member 30.

[0231] In one embodiment, the second body 81 has a second protrusion 81b on the side facing the second adapter plate 70. When the second insulating member 80 is connected to the second adapter plate 70, the second protrusion 81b can contact and connect to the second adapter plate 70. Supported by the second protrusion 81b, a gap is created between the second insulating member 80 and the second adapter plate 70 to accommodate the fifth heat-conducting layer. It is understood that the size of the gap between the second insulating member 80 and the second adapter plate 70 can be adjusted by adjusting the length of the second protrusion 81b along the third direction Z, thereby adjusting the amount of the fifth heat-conducting layer between the second insulating member 80 and the second adapter plate 70.

[0232] In one embodiment, the first thermally conductive layer 101, the second thermally conductive layer 102, the third thermally conductive layer, the fifth thermally conductive layer, the sixth thermally conductive layer, and the seventh thermally conductive layer include thermally conductive adhesive and thermally conductive pad.

[0233] Please see Figure 12 , Figure 16 , Figure 18 , Figure 19 and Figure 20In one embodiment, the first connector 30 includes a first portion 31 and a second portion 32, with the first portion 31 connecting to the second portion 32. A first channel 30a and a second connecting hole 30b are disposed in the first portion 31. The first channel 30a extends through the first portion 31 along a first direction X. The first portion 31 includes a first surface 311 and a second surface 312 disposed along a second direction Y. Along the second direction Y, the projection of the first surface 311 overlaps with the projection of the first column of battery cells 20a, and the projection of the second surface 312 overlaps with the projection of the second column of battery cells 20b. Heat from the first column of battery cells 20a is conducted through the first surface 311, and heat from the second column of battery cells 20b is conducted through the second surface 312 for heat dissipation. Optionally, along the first direction X, the projection of the first column of battery cells 20a is located within the projection of the first surface 311, and the projection of the second column of battery cells 20b is located within the projection of the second surface 312, so that the sides of the first column of battery cells 20a can conduct heat with the first surface 311, and the sides of the second column of battery cells 20b can conduct heat with the second surface 312, thereby further improving heat dissipation.

[0234] In one embodiment, thermally conductive adhesive is provided between the first portion 31 and the first column of battery cells 20a to facilitate rapid heat conduction to the first connector 30, further improving heat dissipation. In another embodiment, thermally conductive adhesive is provided between the first portion 31 and the second column of battery cells 20b to facilitate rapid heat conduction to the first connector 30, further improving heat dissipation.

[0235] In one embodiment, the first portion 31 is further provided with a second channel 30c, which penetrates the first portion 31 along a first direction X. The first channel 30a and the second channel 30c are spaced apart along a third direction Z. By providing the second channel 30c, the first channel 30a and the second channel 30c can work together to dissipate heat from the battery cell 21, further improving heat dissipation efficiency. It is understood that the number of channels on the first portion 31 can be adjusted according to heat dissipation requirements and the length of the first portion 31 along the third direction Z; the longer the length of the first portion 31, the more channels can be provided. It is understood that as the number of channels increases, the number of openings on the first housing 11 and the second housing 12 also needs to increase.

[0236] In one embodiment, the second portion 32 is disposed perpendicular to the first portion 31 and is located on the side of the first insulating member 60 opposite to the first adapter plate 50. Along the third direction Z, the projections of the first conductive sheet 52 and the first through hole 61a are both located within the projection of the second portion 32. Optionally, a third thermally conductive layer is disposed between the second portion 32 and the first body 61. The heat from the first column of battery cells 20a is conducted to the second portion 32 through the third thermally conductive layer, and then to the first portion 31 through the second portion 32. The heat on the first portion 31 is carried away by the air flowing within the first channel 30a, thus achieving heat dissipation for the first column of battery cells 20a.

[0237] In one embodiment, a first notch 321 is provided on the side of the second part 32 that connects to the first part 31, and the first conductive element 24 is connected to the first conductive sheet 52 through the first notch 321.

[0238] In one embodiment, the first connector 30 further includes a third portion 33, which is connected to the first portion 31. The third portion 33 is perpendicular to the first portion 31. The third portion 33 is disposed on the side of the second insulating member 80 opposite to the second adapter plate 70. Along the third direction Z, the projection of the second conductive sheet 71 and the projection of the second through hole 81a are both located within the projection of the third portion 33. Optionally, a sixth thermally conductive layer is disposed between the third portion 33 and the second main body 81. The heat from the second row of battery cells 20b is conducted to the third portion 33 through the sixth thermally conductive layer, and then to the first portion 31 through the third portion 33. The heat on the first portion 31 is carried away by the air flowing in the first channel 30a, thereby achieving heat dissipation for the second row of battery cells 20b.

[0239] In one embodiment, a second notch 331 is provided on the side of the third portion 33 that connects to the first portion 31, and the first conductive element 24 is connected to the second conductive sheet 71 through the second notch 331. When the first conductive element 24 is connected to the first conductive sheet 52 and the second conductive sheet 71, when viewed along the first direction X, the first portion 31 is partially located within the second recess 241.

[0240] In one embodiment, the first part 31, the second part 32, and the third part 33 are an integral structure.

[0241] Please see Figure 21 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.

[0242] 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 in that, include: A housing assembly having a first space, the housing assembly having a first opening and a second opening communicating with the first space; A first connector is accommodated in the first space. The first connector has a first channel, and the first opening and the second opening are connected through the first channel. A battery cell assembly includes a first column of battery cells and a second column of battery cells arranged along a second direction. The first column of battery cells includes a plurality of battery cells stacked along a first direction, and the second column of battery cells includes a plurality of battery cells stacked along the first direction. The first direction is perpendicular to the second direction. At least a portion of the battery cell assembly is disposed in a first space. Along the first direction, the projections of the first opening and the second opening are separate from the projection of the battery cell assembly. The housing assembly includes a first housing, the first housing including a first wall, a first side wall, a second side wall, a third side wall and a fourth side wall, the first wall connecting the first side wall, the second side wall, the third side wall and the fourth side wall to form the first space, the first opening being provided on the first side wall, the second opening being provided on the second side wall, the first side wall and the second side wall being arranged along the first direction, and the third side wall and the fourth side wall being arranged along the second direction; The first connector includes a first portion, the first channel is disposed in the first portion along the second direction, and the first portion is located between the third sidewall and the fourth sidewall; Along the second direction, the first portion is disposed between the first column of battery cells and the second column of battery cells.

2. The battery pack as described in claim 1, characterized in that, The first connector includes a second portion connecting the first portion, and the cell assembly is located between the first wall and the second portion along a third direction, wherein the third direction is perpendicular to both the first direction and the second direction.

3. The battery pack as described in claim 2, characterized in that, The battery cell includes a battery cell housing, an electrode assembly disposed within the battery cell housing, and electrode terminals connected to the electrode assembly and extending out of the battery cell housing.

4. The battery pack as described in claim 3, characterized in that, The first connector further includes a third part connected to the first part, wherein, along the third direction, the first column of cells is located between the second part and the first wall, and the second column of cells is located between the third part and the first wall.

5. The battery pack as described in claim 4, characterized in that, The battery pack further includes a first conductive element, a second part having a first notch, and a third part having a second notch. One end of the first conductive element is connected to the first column of battery cells, and the other end is connected to the second column of battery cells. A portion of the first conductive element passes through the first notch, and a portion of the first conductive element passes through the second notch.

6. The battery pack as described in claim 3, characterized in that, It also includes a first insulating member and a first adapter plate. The first adapter plate is connected to the electrode terminal. The first insulating member is disposed on the side of the first adapter plate opposite to the cell assembly. Along the second direction, the projection of the first adapter plate overlaps with the projection of the first insulating member, and the projection of the electrode terminal overlaps with the projection of the first insulating member.

7. The battery pack as described in claim 6, characterized in that, A first thermally conductive layer is provided between the first adapter plate and the battery cell housing, and the projection of the electrode terminal overlaps with the projection of the first thermally conductive layer along the first direction.

8. The battery pack as described in claim 7, characterized in that, A second thermally conductive layer is provided between the first insulating component and the first adapter plate, and the projection of the electrode terminal overlaps with the projection of the second thermally conductive layer along the first direction.

9. The battery pack as described in claim 8, characterized in that, The first and second thermally conductive layers are made of the same material. The first and second thermally conductive layers are formed after the flowing insulating material is poured in and solidified.

10. The battery pack as claimed in claim 6, characterized in that, The second part is located on the side of the first insulating member away from the first adapter plate, and a third heat-conducting layer is provided between the second part and the first insulating member.

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

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