Battery pack and electric equipment

Abstract

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

Description

[0001] This application is a divisional application of application number 202310072875.1, filed on January 17, 2023, entitled "Battery Pack and Electrical Equipment". Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a battery pack and electrical equipment. Background Technology

[0003] When a battery is in use, the battery cell generates a lot of heat. To prevent the battery temperature from getting too high, it is necessary to dissipate heat. The traditional way to dissipate heat is to add heat sinks between the battery cells, but this method has limited heat dissipation effect on the battery cells. Summary of the Invention

[0004] In view of this, it is necessary to provide a battery pack and electrical device that can improve heat dissipation of the battery cells.

[0005] Embodiments of this application provide a battery pack, including a housing assembly, a cell assembly, a first circuit board, a bracket, and a heat-conducting component. The cell assembly is housed within the housing assembly. The cell assembly includes multiple cells. Each cell includes a cell housing, an electrode assembly disposed within the cell housing, and electrode terminals connecting to the electrode assembly and extending out of the cell housing. The electrode terminals pass through the first circuit board and are connected to the side of the first circuit board opposite to the cell housing. The bracket connects to the first circuit board, which is disposed between the cell housing and the bracket. The bracket has a first opening, and the heat-conducting component is disposed within the first opening. The heat-conducting component connects to at least a portion of the electrode terminals. By providing a first opening in the bracket and connecting the heat-conducting component to at least a portion of the electrode terminals, heat from the electrode terminals is dissipated through the heat-conducting component, improving heat dissipation efficiency.

[0006] Optionally, in some embodiments of this application, the battery cell housing and the first circuit board are arranged along a first direction. Multiple battery cells are stacked along a third direction. A first conductive sheet is disposed on the first circuit board. The electrode terminals of adjacent battery cells pass through the first circuit board and are stacked and connected to the first conductive sheet. A heat-conducting component connects the electrode terminals to the side facing away from the first conductive sheet, with the third direction perpendicular to the first direction. By connecting the electrode terminals through the first circuit board and stacked with the first conductive sheet, it is convenient for the heat-conducting component to connect the electrode terminals.

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

[0008] Optionally, in some embodiments of this application, the first conductive sheet may be a conductive sheet disposed on a first circuit board, and the conductive sheet is soldered to the first circuit board.

[0009] Optionally, in some embodiments of this application, the electrode terminal connected to the first conductive sheet includes two first ends disposed along a second direction. The first opening includes two first edges disposed along the second direction. Viewed in a direction opposite to the first direction, the two first edges are located between the two first ends along the second direction, which is perpendicular to the first direction. The side ends of the electrode terminals are located away from the first opening, reducing the possibility of burrs from the electrode terminals piercing the heat-conducting element.

[0010] Optionally, in some embodiments of this application, the first conductive sheet includes two second ends disposed along a second direction. Viewed in the direction opposite to the first direction, along the second direction, the two first ends are located between the two second ends. The side ends of the first conductive sheet are away from the first opening, reducing the possibility of burrs from the first conductive sheet piercing the heat-conducting component.

[0011] Optionally, in some embodiments of this application, a heat sink is also included. The heat sink is disposed on the side of the bracket away from the first circuit board. The heat-conducting element includes a first surface and a second surface disposed opposite to each other along a first direction. The first surface is connected to at least a portion of the electrode terminals through a first opening. The second surface is connected to the heat sink. By providing the heat sink, the heat from the electrode terminals is conducted through the first surface to the second surface and then through the second surface to the heat sink, which is beneficial for conducting the heat from the electrode terminals.

[0012] Optionally, in some embodiments of this application, the first surface protrudes from the first opening in a direction opposite to the first direction, facilitating the connection of the first surface to the solder portion of the electrode terminal. The second surface protrudes from the first opening in the first direction and connects to the heat sink, facilitating the connection of the second surface to the heat sink.

[0013] Optionally, in some embodiments of this application, the housing assembly includes a first housing. The first housing includes a first wall and a second wall disposed along a third direction, a third wall and a fourth wall disposed along a second direction, and a bottom wall. The bottom wall connects the first wall, the second wall, the third wall, and the fourth wall and forms a first space. A heat sink is disposed in the first space. The heat sink is connected to the inner surfaces of the first wall, the second wall, the third wall, and the fourth wall, and can be fixed to the inner wall of the first housing.

[0014] Optionally, in some embodiments of this application, a first connector is also included. The first connector is partially disposed between the bracket and the heat sink. The bracket and the heat sink are bonded together by the first connector, sealing and insulating the space between the cell assembly and the heat sink, thereby reducing the risk of short circuit between the heat sink and the electrode terminals.

[0015] Optionally, in some embodiments of this application, a first protrusion is provided on the side of the bracket facing the heat sink along a first direction. The first protrusion connects to the heat sink. A first gap exists between the bracket and the heat sink. A first connecting member is partially disposed in the first gap. The first protrusion creates a first gap between the bracket body and the heat sink, facilitating the placement of the first connecting member in the first gap to seal and insulate the space between the bracket and the heat sink.

[0016] Optionally, in some embodiments of this application, the bracket includes a bracket body. A first opening is provided in the bracket body. The bracket body has a plurality of first through holes. At least one first through hole is configured to allow a first connector to flow into a first gap. At least a portion of the first connector is provided in at least one first through hole. By providing the first through holes, it is convenient for the first connector to flow into the first gap.

[0017] Optionally, in some embodiments of this application, when viewed from a direction opposite to the first direction, a portion of at least one electrode terminal is located in the first through hole, further improving heat dissipation from the electrode terminal; and / or Viewed from the opposite direction to the first direction, at least a portion of the first conductive sheet is located in the first through hole, further improving heat dissipation of the first conductive sheet.

[0018] Optionally, in some embodiments of this application, the bracket includes a bracket body that covers a portion of the first circuit board and insulates the first circuit board.

[0019] Optionally, in some embodiments of this application, the first connector is disposed between the first circuit board and the bracket. The bracket and the first circuit board are connected by the first connector, which can further insulate the first circuit board.

[0020] Optionally, in some embodiments of this application, a second protrusion is provided on the side of the bracket facing the first circuit board in a direction opposite to the first direction. The second protrusion connects to the first circuit board. A second gap exists between the bracket and the first circuit board. A first connecting member is partially disposed in the second gap. The second protrusion creates a second gap between the bracket and the first circuit board, facilitating the placement of the first connecting member in the second gap and sealing and insulating the space between the bracket and the second gap.

[0021] Optionally, in some embodiments of this application, the first connector covers the portion of the electrode terminal that extends out of the cell housing, thereby strengthening the fixation of the electrode terminal and improving heat dissipation from the electrode terminal.

[0022] Optionally, in some embodiments of this application, all of the third holes allow the first connector to flow between the heat-conducting component and the first circuit board. At least a portion of the first connector is located in the third hole to improve heat dissipation.

[0023] Optionally, in some embodiments of this application, the first circuit board is provided with a third hole. Viewed in a direction opposite to the first direction, the third hole is located within the first opening, and the third hole is separate from the first conductive sheet. At least one third hole is configured to allow the first connector to flow between the heat-conducting element and the first circuit board. At least a portion of the first connector is located within at least one third hole, further improving heat dissipation.

[0024] Optionally, in some embodiments of this application, the first connector is configured to be formed by curing a flowing first insulating material onto the battery pack.

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

[0026] Optionally, in some embodiments of this application, the thermal conductivity of the heat-conducting component is higher than that of the first connector, thereby improving the heat conduction effect of the heat-conducting component.

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

[0028] Optionally, in some embodiments of this application, the first circuit board further includes a second conductive sheet and a third conductive sheet. Along a third direction, the electrode terminal of one of the outermost battery cells is connected to the second conductive sheet, and the electrode terminal of the other outermost battery cell is connected to the third conductive sheet. The support body has multiple second through holes. Viewed in a direction opposite to the first direction, a portion of the second conductive sheet is located within the second through hole, a portion of the third conductive sheet is located within the second through hole, and a portion of the first connector is located within the second through hole, with the third direction perpendicular to the first direction. Through the first connector within the second through hole, heat from the electrode terminals connected to the second conductive sheet, the second conductive sheet itself, the electrode terminals connected to the third conductive sheet, and the third conductive sheet are conducted to the heat sink, which facilitates heat dissipation.

[0029] Optionally, in some embodiments of this application, when viewed in a direction opposite to the first direction, a portion of the fourth conductive sheet is located within the second through hole. Through the first connector within the second through hole, the heat from the electrode terminals connected to the fourth conductive sheet and the heat from the fourth conductive sheet are conducted to the heat sink, which is beneficial for heat dissipation.

[0030] Optionally, in some embodiments of this application, the first housing is provided with a first opening and a second opening, and the heat sink is provided with a first channel. The first channel connects the first opening and the second opening, which helps to improve heat dissipation efficiency.

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

[0032] Optionally, in some embodiments of this application, a connecting bracket is further included, with a second space formed between the connecting bracket and the heat sink. The connecting bracket has a bracket through hole. The bracket through hole communicates with the second space, which facilitates heat dissipation from the heat sink to the second circuit board. An embodiment of this application also provides an electrical device, including the battery pack in any of the above embodiments.

[0033] The aforementioned battery pack and electrical equipment improve heat dissipation efficiency by providing a first opening in the bracket and connecting a heat-conducting component to at least a portion of the electrode terminals, allowing the heat from the electrode terminals to be dissipated through the heat-conducting component. Attached Figure Description

[0034] Figure 1 Schematic diagrams of the battery pack structure are shown in some embodiments.

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

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

[0037] Figure 4 It shows Figure 1 Cross-sectional view of the battery pack along line III-III.

[0038] Figure 5 It shows Figure 4 An enlarged schematic diagram of the middle V section.

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

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

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

[0042] Figure 9 Schematic diagrams of the battery pack structure are shown in some embodiments.

[0043] Figure 10 It shows Figure 9 A schematic diagram of the decomposition process.

[0044] Figure 11 It shows Figure 10 An exploded view of the battery cell assembly.

[0045] Figure 12 Schematic diagrams of the battery cell and the first circuit board in some embodiments are shown.

[0046] Figure 13 Schematic diagrams of the support structure are shown in some embodiments.

[0047] Figure 14 A structural schematic diagram of the bracket from another perspective is shown in some embodiments.

[0048] Figure 15 Schematic diagrams of the battery cell, first circuit board, and bracket are shown in some embodiments.

[0049] Figure 16 Schematic diagrams of the battery cell, first circuit board, bracket, and heat-conducting component are shown in some embodiments.

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

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

[0052] Figure 19 It shows Figure 18 Enlarged schematic diagram of Part II.

[0053] Figure 20 Schematic diagrams of electrical equipment in some embodiments are shown.

[0054] Explanation of key component symbols: Battery pack 100, housing assembly 10, first housing 11, first wall 111, fifth connecting hole 1111, third fastener 1112, fourth fastener 1113, seventh connecting hole 1114, first opening 10a, second wall 112, second opening 10b, third wall 113, first region 113a, first housing insulator 1130, first connecting hole 113b, first fastener 113c, fourth wall 114, third connecting hole 114b, second fastener 114c, bottom wall 115, first space 101, second space 102, second housing 12, second housing recess 12a, second circuit board 13, first connecting part 131, second... Connecting part 132, connecting bracket 14, bracket through hole 141, cell assembly 20, cell 21, cell housing 211, first outer shell 2111, second outer shell 2112, first extension 2113, second extension 2114, first sealing part 2115, second sealing part 2116, first portion 211a, second portion 211b, first recess 211c, electrode assembly 212, electrode terminal 213, welding part 213a, first end 2131, first terminal 213b, second terminal 213c, first row of cells 21a, second row of cells 21b, heat dissipation part 22, first elastic element 221a, first circuit board 30, hole 31, first Hole 311, second hole 312, third hole 313, first conductive piece 32, second end 321, second conductive piece 33, third conductive piece 34, fourth conductive piece 35, fourth hole 36, sampling harness 100a, first electrical connection 100b, first conductive part 110, first insulating part 120, second electrical connection 100c, second conductive part 130, second insulating part 140, bracket 40, first opening 40a, first gap 40b, second gap 40c, third protrusion 40d, first edge 401, bracket body 41, second opening 42, first protrusion 402, third opening 43, second protrusion 403, fourth opening 45, guide plate 45 1. First protrusion 46, second protrusion 47, first through hole 48, second through hole 49, heat-conducting component 50, first surface 50a, second surface 50b, radiator 60, first channel 60a, first sidewall 60b, second connecting hole 601, second sidewall 60c, fourth connecting hole 602, third sidewall 60d, sixth connecting hole 603, fourth sidewall 60e, eighth connecting hole 604, first receiving space 61, second receiving space 62, third receiving space 63, fourth protrusion 64, first connector 70, second insulating component 80, third insulating component 81, fourth insulating component 82, electrical equipment 200, first direction X, second direction Y, third direction Z The following specific embodiments will further illustrate this application in conjunction with the above-described accompanying drawings. Detailed Implementation

[0055] The following specific embodiments are exemplary and not limiting, and are intended to provide a basic understanding of this application, and are not intended to identify key or decisive elements of this application or limit the scope of protection. As long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

[0056] 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.

[0057] It's understandable that the terms "perpendicular" or "equal to" are used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular or equal to each other. For example, combined with numerical descriptions, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is a straight line or plane, the component can be considered a "straight line" or "plane."

[0058] The term "parallel" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately parallel. For example, in numerical terms, parallel can refer to the angle between two straight lines within the range of 180° ± 10°, the dihedral angle between two planes within the range of 180° ± 10°, or the angle between a straight line and a plane within the range of 180° ± 10°. The two components described as "parallel" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is straight or plane, the component can be considered a "straight line" or "plane".

[0059] 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.

[0060] Please see Figures 1 to 5This application provides a battery pack 100, including a housing assembly 10, a cell assembly 20, a first circuit board 30, a bracket 40, and a heat-conducting component 50. The cell assembly 20 is disposed within the housing assembly 10. The first circuit board 30 is disposed within the housing assembly 10 and connected to the cell assembly 20. The cell assembly 20 includes a plurality of cells 21, each cell 21 including a cell housing 211, an electrode assembly 212 disposed within the cell housing 211, and electrode terminals 213 connected to the electrode assembly 212 and extending from the cell housing 211. The electrode terminals 213 pass through the first circuit board 30 and are connected to the side of the first circuit board 30 opposite to the cell housing 211. The bracket 40 connects to the side of the first circuit board 30 opposite to the cell assembly 20, and the first circuit board 30 is disposed between the cell housing 211 and the bracket 40. The bracket 40 has a first opening 40a. The heat-conducting component 50 is disposed in the first opening 40a, and the heat-conducting component 50 is connected to at least a portion of the electrode terminals 213 through the first opening 40a. The heat from the electrode terminal 213 is dissipated through the heat-conducting component 50, thereby improving the heat dissipation efficiency.

[0061] In one embodiment, the housing assembly 10 includes a first housing 11 and a second housing 12, with the first housing 11 connected to the second housing 12. The first housing 11 includes a first wall 111, a second wall 112, a third wall 113, a fourth wall 114, and a bottom wall 115. The first wall 111 and the second wall 112 are disposed opposite to each other, as are the third wall 113 and the fourth wall 114. The bottom wall 115 is disposed opposite to the second housing 12. The first wall 111 connects the third wall 113 and the fourth wall 114, the second wall 112 connects the third wall 113 and the fourth wall 114, and the bottom wall 115 connects the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114, forming a first space 101 for accommodating at least one of the following components: the battery cell assembly 20, the first circuit board 30, the bracket 40, and the heat-conducting element 50.

[0062] Optionally, the first wall 111, the second wall 112, the third wall 113, the fourth wall 114, and the bottom wall 115 can be connected to form the first housing 11 by means of screw locking, welding, or bonding. Optionally, the first wall 111, the second wall 112, the third wall 113, the fourth wall 114, and the bottom wall 115 can also be integrally formed, for example, by using an injection molding process to form an integral structure, or by forming an integral structure by extruding metal materials.

[0063] Optionally, the first housing 11 includes a thermally conductive material to improve heat dissipation performance. Optionally, the thermally conductive material includes a metallic thermally conductive material and a thermally conductive insulating material, with the insulating material covering the outer surface of the metallic thermally conductive material. Optionally, the metallic thermally conductive material of the first housing 11 includes aluminum. Optionally, the surface of the first housing 11 includes a thermally conductive metallic material, which is beneficial for improving heat dissipation.

[0064] 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 bottom wall 115 and the second housing 12 are relatively arranged. The second direction Y is the direction in which the third wall 113 and the fourth wall 114 are relatively arranged. The third direction Z is the direction in which the first wall 111 and the second wall 112 are relatively arranged. The first direction X is perpendicular to both the second direction Y and the third direction Z.

[0065] In one embodiment, the battery pack 100 further includes a heat sink 60 disposed within the first space 101 and located on the side of the bracket 40 opposite to the first circuit board 30. The housing assembly 10 has a first opening 10a and a second opening 10b, which communicate with the outside. The heat sink 60 has a first channel 60a, which connects the first opening 10a and the second opening 10b. The heat sink 60 dissipates heat from the electrode terminals 213 through the first channel 60a from the first opening 10a and the second opening 10b to the external environment, further improving heat dissipation from the electrode terminals 213 and reducing the temperature of the battery pack 100.

[0066] Optionally, the heat from the first circuit board 30 can also be transferred to the heat sink 60 through the heat conductor 50, which can dissipate heat from the first circuit board 30 and further improve the heat dissipation of the battery pack 100.

[0067] In one embodiment, the battery pack 100 can utilize external air to dissipate heat from the first circuit board 30 and the cell assembly 20 through airflow. In one embodiment, the battery pack 100 can be used on a device that is static during use, where natural wind or external air-cooling equipment can be used for heat dissipation. In one embodiment, the battery pack 100 can be used on a device that is dynamic during use, such as a drone or an electric bicycle, where the faster airflow during device movement allows for rapid heat dissipation of the battery pack 100.

[0068] In one embodiment, a first opening 10a is provided on the first wall 111, and a second opening 10b is provided on the second wall 112. Along the third direction Z, the first opening 10a penetrates the first wall 111, and the second opening 10b penetrates the second wall 112. A heat sink 60 connects the inner surfaces of the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114. A first channel 60a connects the first opening 10a and the second opening 10b. When the battery pack 100 moves along the third direction Z or the airflow of the external air-cooling device is along the third direction Z, the first opening 10a acts as an air inlet, and the second opening 10b acts as an air outlet. Air enters from the first opening 10a, passes through the first channel 60a, and flows out from the second opening 10b, improving heat dissipation. When the battery pack 100 moves in the opposite direction to the third direction Z or the airflow of the external air-cooling device is in the opposite direction to the third direction Z, the first opening 10a acts as an air outlet, and the second opening 10b acts as an air inlet. Optionally, the first opening 10a can also be provided in the third wall 113, and the second opening 10b can also be provided in the fourth wall 114. Optionally, the second opening 10b can be provided in the second wall 112, and the first opening 10a can also be provided in the third wall 113.

[0069] In one embodiment, along the third direction Z, the projection of the first opening 10a overlaps with the projection of the second opening 10b. It is understood that, along the third direction Z, the projections of the first opening 10a and the second opening 10b partially overlap, or the projection of the first opening 10a completely covers the projection of the second opening 10b, or the projection of the second opening 10b completely covers the projection of the first opening 10a. In a specific implementation of this application, along the third direction Z, the projection of the first opening 10a is larger than and covers the projection of the second opening 10b. When the battery pack 100 moves along the third direction Z or the airflow of the external air-cooling device is along the third direction Z, the first opening 10a serves as an air inlet, and the second opening 10b serves as an air outlet. Because the diameter of the first opening 10a is larger than the diameter of the second opening 10b, airflow convection is enhanced, further improving heat dissipation.

[0070] Please see Figure 3 and Figure 6 In one embodiment, the battery pack 100 further includes a second circuit board 13. The second housing 12 has a second housing recess 12a, and the second circuit board 13 is disposed within the second housing recess 12a. The second circuit board 13 is insulated from the second housing 12. Along the first direction X, a heat sink 60 is disposed between the first circuit board 30 and the second circuit board 13. The second circuit board 13 has a first connecting portion 131 and a second connecting portion 132, which are electrically connected to the first circuit board 30.

[0071] In one embodiment, the second circuit board 13 includes a Battery Management System (BMS) component. The BMS component includes multiple electronic components that can perform functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21. Optionally, the second circuit board 13 includes a flexible printed circuit board (FPC). Optionally, the second circuit board 13 includes a printed circuit board (PCB), on which multiple wires (not shown) are disposed.

[0072] In one embodiment, the battery pack 100 further includes a connecting bracket 14 disposed between the first housing 11 and the second housing 12, with the first housing 11 and the second housing 12 connected to the connecting bracket 14. The connecting bracket 14 is disposed between the second circuit board 13 and the heat sink 60, which can reduce the risk of short circuits between the second circuit board 13 and the heat sink 60. Optionally, the connecting bracket 14 is made of an insulating material.

[0073] In one embodiment, a second space 102 is formed between the connecting bracket 14 and the heat sink 60. The connecting bracket 14 has a bracket through hole 141 that connects to the second space 102, which facilitates heat dissipation from the heat sink 60 to the second circuit board 13. The heat generated by the second circuit board 13 accumulates in the second space 102. When the first channel 60a dissipates heat, the surface temperature of the heat sink 60 near the second circuit board 13 is lower, transferring the heat generated by the second circuit board 13 to the surface of the heat sink 60, thus dissipating heat from the second circuit board 13.

[0074] Please see Figure 4 , Figure 5 and Figure 19 In one embodiment, the battery pack 100 further includes a first connector 70, which is connected to the inner surfaces of the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114. The first connector 70 adhesively connects the cell assembly 20, the first circuit board 30, the bracket 40, and the heat sink 60, sealing and insulating the space between the cell assembly 20 and the heat sink 60, thereby reducing the risk of a short circuit between the heat sink 60 and the electrode terminals 213. When the battery pack 100 is subjected to external impact, the first connector 70 can enhance the protection of the battery pack 100 and reduce the impact of external impurities, such as water, on the first circuit board 30 and the electrode terminals 213.

[0075] Optionally, the first connector 70 has a good thermal conductivity, which is beneficial to improving the heat dissipation of the battery pack 100. The thermal conductivity of the first connector 70 is A, where 0.8 W / (m·K) < A ≤ 3.0 W / (m·K). The thermal conductivity A satisfies any one of the following: 0.9 W / (m·K), 1.0 W / (m·K), 1.1 W / (m·K), 1.2 W / (m·K), 1.3 W / (m·K), 1.4 W / (m·K), 1.5 W / (m·K), 1.6 W / (m·K), 1.7 W / (m·K), 1.8 W / (m·K), 1.9 W / (m·K), 2.0 W / (m·K), 2.1 W / (m·K), 2.2 W / (m·K), 2.3 W / (m·K), 2.4 W / (m·K), 2.5 W / (m·K), 2.6 W / (m·K), 2.7 W / (m·K), 2.8 W / (m·K), 2.9 W / (m·K), and 3.0 W / (m·K).

[0076] In one embodiment, the first connector 70 is configured to be formed by applying a flowing first insulating material to the battery pack after curing 100. Optionally, the first connector 70 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive to reduce the weight of the first connector 70. Optionally, the first connector 70 includes expanding foam. In one embodiment, the cell assembly 20, the first circuit board 30, the bracket 40, and the heat sink 60 are installed in the first housing 11, and the heat sink 60 is connected to the first housing 11. Then, the first housing 11 is inverted, and the flowing first insulating material is injected into the battery pack 100. After inversion, the heat sink 60, the bracket 40, and the first circuit board 30 are arranged sequentially along a first direction. Optionally, the flowing first insulating material is injected into the battery pack 100 from the bottom of the cell assembly 20 along the first direction X.

[0077] Optionally, the viscosity B of the first connector 70 satisfies 800 mPa·s ≤ A ≤ 1000 mPa·s, which is beneficial for better filling the gaps between the cell assembly 20, the first circuit board 30, the bracket 40, and the heat sink 60. For example, the viscosity B can satisfy any one of 800 mPa·s, 810 mPa·s, 820 mPa·s, 830 mPa·s, 840 mPa·s, 850 mPa·s, 860 mPa·s, 870 mPa·s, 880 mPa·s, 890 mPa·s, 900 mPa·s, 910 mPa·s, 920 mPa·s, 930 mPa·s, 940 mPa·s, 950 mPa·s, 960 mPa·s, 970 mPa·s, 980 mPa·s, 990 mPa·s, and 1000 mPa·s.

[0078] Please see Figure 3The third wall 113 has a first region 113a, and the first region 113a is provided with a first housing insulation member 1130. The heat sink 60 has a first sidewall 60b and a second sidewall 60c disposed opposite each other along the second direction Y. The third wall 113 is connected to the first sidewall 60b. The first housing insulation member 1130 is located between the first region 113a and the first sidewall 60b. The gap between the first housing insulation member 1130 and the first sidewall 60b can reduce the flow of the first insulating material in the gap between the first region 113a and the first sidewall 60b when the first housing 11 is inverted and the first connector 70 is injected. Optionally, the first housing insulation member 1130 is thermally conductive, which can transfer heat from the heat sink 60 to the third wall 113. Optionally, the first housing insulation member 1130 includes adhesive. Optionally, the adhesive includes thermally conductive adhesive. Optionally, the thermal conductivity of the thermally conductive adhesive is in the range of C, where 2.5 W / (m·K) < C ≤ 5.0 W / (m·K). The thermal conductivity C satisfies the following values: 2.6 W / (m·K), 2.7 W / (m·K), 2.8 W / (m·K), 2.9 W / (m·K), 3.0 W / (m·K), 3.1 W / (m·K), 3.2 W / (m·K), 3.3 W / (m·K), 3.4 W / (m·K), 3.5 W / (m·K), 3.6 W / (m·K), 3.7 W / (m·K), 3.8 W / (m·K). The power ratings are any one of 3.9 W / (m·K), 4.0 W / (m·K), 4.1 W / (m·K), 4.2 W / (m·K), 4.3 W / (m·K), 4.4 W / (m·K), 4.5 W / (m·K), 4.6 W / (m·K), 4.7 W / (m·K), 4.8 W / (m·K), 4.9 W / (m·K), and 5.0 W / (m·K). Optionally, the first housing insulation 1130 can also confine external impurities, such as water, within the battery pack 100.

[0079] Optionally, the fourth wall 114 has a second region (not shown), the second region having a second housing insulation member (not shown), the fourth wall 114 connecting to the second side wall 60c, the second housing insulation member being located between the second region and the second side wall 60c to connect the radiator 60 and the fourth wall 114, the second housing insulation member being disposed in the gap between the second region and the second side wall 60c, which can reduce the flow of insulating material in the gap between the second region and the second side wall 60c when the first housing 11 is inverted and the first connector 70 is injected. Optionally, the second housing insulation member is thermally conductive, capable of transferring heat from the radiator 60 to the fourth wall 114. Optionally, the second housing insulation member includes adhesive. Optionally, the adhesive includes thermally conductive adhesive. Optionally, the thermal conductivity of the thermally conductive adhesive is in the range of C, where 2.5 W / (m·K) < C ≤ 5.0 W / (m·K). The thermal conductivity C satisfies the following values: 2.6 W / (m·K), 2.7 W / (m·K), 2.8 W / (m·K), 2.9 W / (m·K), 3.0 W / (m·K), 3.1 W / (m·K), 3.2 W / (m·K), 3.3 W / (m·K), 3.4 W / (m·K), 3.5 W / (m·K), 3.6 W / (m·K), 3.7 W / (m·K), 3.8 W / The values ​​are any one of 3.9W / (m·K), 4.0W / (m·K), 4.1W / (m·K), 4.2W / (m·K), 4.3W / (m·K), 4.4W / (m·K), 4.5W / (m·K), 4.6W / (m·K), 4.7W / (m·K), 4.8W / (m·K), 4.9W / (m·K), and 5.0W / (m·K). Optionally, the second housing insulation can also prevent external impurities and dust from entering the cell assembly 20.

[0080] In one embodiment, the third wall 113 is provided with a first connection hole 113b, the first side wall 60b is provided with a second connection hole 601, and the battery pack 100 includes a first fastener 113c. The heat sink 60 is fixed to the third wall 113 by the first fastener 113c passing through the first connection hole 113b and the second connection hole 601.

[0081] In one embodiment, the fourth wall 114 is provided with a third connection hole 114b, the second side wall 60c is provided with a sixth connection hole 603, and the battery pack 100 includes a second fastener 114c. The heat sink 60 is fixed to the fourth wall 114 by the second fastener 114c passing through the third connection hole 114b and the fourth connection hole 602.

[0082] In one embodiment, there are multiple first openings 10a and two openings 10b, and the number of each is the same. Along the third direction Z, the projections of the first openings 10a and second openings 10b overlap. Optionally, the multiple first openings 10a are spaced apart, and a fifth connecting hole 1111 is provided between adjacent first openings 10a. The heat sink 60 includes a third sidewall 60d and a fourth sidewall 60e disposed opposite each other along the third direction Z. The third sidewall 60d has a sixth connecting hole 603, and along the third direction Z, the projections of the fifth connecting hole 1111 and the sixth connecting hole 603 overlap. The battery pack 100 includes a third fastener 1112. The third fastener 1112 is disposed at the fifth connecting hole 1111 and the sixth connecting hole 603, and is used to connect the heat sink 60 and the first wall 111.

[0083] In one embodiment, the battery pack 100 includes a fourth fastener 1113. Optionally, a plurality of second openings 10b are spaced apart, a seventh connecting hole 1114 is provided between adjacent second openings 10b, and an eighth connecting hole 604 is provided on the fourth sidewall 60e. Along the third direction Z, the projections of the seventh connecting hole 1114 and the eighth connecting hole 604 overlap. The fourth fastener 1113 is provided at the seventh connecting hole 1114 and the eighth connecting hole 604 for connecting the heat sink 60 and the second wall 112.

[0084] Please see Figure 4 , Figure 7 and Figure 8 In one embodiment, the cell housing 211 includes a first portion 211a and a second portion 211b. The first portion 211a accommodates the electrode assembly 212, and the second portion 211b connects to the first portion 211a. Electrode terminals 213 extend from the second portion 211b. Optionally, a first connector 70 is disposed between the heat sink 60 and the cell housing 211, and the first connector 70 covers the first circuit board 30, the bracket 40, and the portion of the electrode terminals 213 located outside the cell housing 211.

[0085] 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 is provided with a first recess 211c, and an electrode assembly 212 is disposed in the first recess 211c. The first outer shell 2111 and the second outer shell 2112 can be folded along the connection position, so that the first outer shell 2111 and the second outer shell 2112 overlap to form a first portion 211a to cover the electrode assembly 212. The peripheral side of the first outer shell 2111 extends outward to form a plurality of first extensions 2113, and the peripheral side of the second outer shell 2112 extends outward to form a plurality of second extensions 2114. After the first outer shell 2111 and the second outer shell 2112 are folded along the connection position, the first extensions 2113 and the second extensions 2114 overlap and are sealed together to form a second portion 211b. Optionally, the first extensions 2113 and the second extensions 2114 are sealed together with sealant. The second part 211b includes a first sealing part 2115 and a second sealing part 2116. The first sealing part 2115 is disposed opposite to the connection position, and the electrode terminal 213 extends out of the first sealing part 2115 into the first part 211a. Optionally, the second part 211b includes two second sealing parts 2116, which are disposed opposite to each other along 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 separate, the second part 211b includes two first sealing portions 2115, the two first sealing portions 2115 are arranged opposite each other along the first direction X, the battery cell 21 includes two electrode terminals 213, one electrode terminal 213 extends out of the battery cell housing 211 from one of the first sealing portions 2115, and the other electrode terminal 213 extends out of the battery cell housing 211 from the other first sealing portion 2115, the two electrode terminals 213 are arranged opposite each other along the first direction X.

[0086] In one embodiment, the first connector 70 covers the portion of the electrode terminal 213 that extends out of the cell housing 211, thereby strengthening the fixation of the electrode terminal 213 and improving the heat dissipation of the electrode terminal 213.

[0087] In one embodiment, the first connector 70 covers a portion of the electrode terminal 213 extending out of the cell housing 211 and at least a portion of the first sealing portion 2115, thereby enhancing the protection of the first sealing portion 2115 and improving the heat dissipation of the cell housing 211.

[0088] In one embodiment, the electrode assembly 212 includes a wound structure formed by winding a positive electrode sheet, a negative electrode sheet, and a separator. In other embodiments, the electrode assembly 212 may also be a stacked structure, i.e., the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked to form an electrode assembly 212 unit, and multiple electrode assembly 212 units are then stacked to form the electrode assembly 212. Optionally, the cell housing 211 includes an aluminum-plastic film. Optionally, the cell 21 includes a pouch cell.

[0089] In one embodiment, the electrode terminal 213 has a weld portion 213a extending beyond the cell housing 211, the weld portion 213a being formed by bending the electrode terminal 213. The electrode terminals 213 of adjacent cells 21 are bent toward each other through the first circuit board 30 and connected to the first circuit board 30. In one embodiment, the electrode terminal 213 includes a first terminal 213b and a second terminal 213c, the first terminal 213b and the second terminal 213c having opposite polarities, one being a positive terminal and the other a negative terminal. Along the first direction X, the projection of the weld portion 213a of the first terminal 213b of the cell 21 at least partially overlaps with the projection of the weld portion 213a of the second terminal 213c of the adjacent cell 21. The first terminals 213b and the second terminals 213c of adjacent cells 21 are bent toward each other, and the weld portions 213a of the first terminal 213b and the weld portions 213a of the second terminal 213c are stacked and connected to each other. By connecting the welding portions 213a of adjacent cells 21 to each other, the welding portions 213a are connected to the first circuit board 30, reducing the number of processing steps.

[0090] In other embodiments, along the first direction X, the projection of the first terminal 213b of the battery cell 21 may at least partially overlap with the projection of the first terminal 213b of the adjacent battery cell 21, and be connected through the first circuit board 30 to realize the parallel connection between the battery cells 21.

[0091] In one embodiment, the battery cell assembly 20 includes a plurality of battery cells 21 stacked along a third direction Z. Optionally, the battery cell assembly 20 includes a plurality of battery cells 21, wherein some of the battery cells 21 are stacked along a third direction Z to form a first column of battery cells 21a, and some of the battery cells 21 are stacked along a third direction Z to form a second column of battery cells 21b, wherein the second column of battery cells 21b and the first column of battery cells 21a are arranged along a second direction Y.

[0092] In one embodiment, the battery cell assembly 20 includes a plurality of battery cells 21, which are stacked along a third direction Z.

[0093] In one embodiment, the battery cell 21 is in contact with the first housing 11, so that the heat of the battery cell 21 is dissipated to the external environment through the first housing 11.

[0094] Please see Figure 11 In one embodiment, the battery cell assembly 20 further includes a plurality of heat dissipation sections 22, which are in contact with the battery cell 21 to dissipate heat from the battery cell 21. Optionally, the heat dissipation section 22 is in contact with the first housing 11 to transfer the heat of the battery cell 21 to the first housing 11, thereby dissipating heat from the battery cell 21 through the first housing 11. Optionally, the heat dissipation section 22 includes an aluminum shell.

[0095] In one embodiment, along the first direction X, the projection of the heat dissipation part 22 overlaps with the projection of the battery cell housing 211; along the second direction Y, the projection of the heat dissipation part 22 overlaps with the projection of the battery cell housing 211; and along the third direction Z, the projection of the heat dissipation part 22 overlaps with the projection of the battery cell housing 211, thereby increasing the contact area between the heat dissipation part 22 and the battery cell housing 211 and improving the heat dissipation efficiency.

[0096] In one embodiment, a first elastic member 221a is provided between adjacent heat dissipation portions 22, and a gap is provided between adjacent battery cells 21, which can increase the width between adjacent battery cells 21 along the third direction Z, facilitating the injection of the first connector 70 and improving the efficiency of injection of the first connector 70. Optionally, the first elastic member 221a includes foam.

[0097] Please see Figure 10 and Figure 12 In one embodiment, the first circuit board 30 is provided with multiple sets of holes 31, each set of holes 31 including a first hole 311 and a second hole 312 disposed along a third direction Z. The first terminal 213b of an adjacent battery cell 21 passes through the first hole 311, and the second terminal 213c of another battery cell 21 passes through the second hole 312. The solder portions 213a of the first terminal 213b and the solder portions 213a of the second terminal 213c are stacked together and connected to the first circuit board 30. Optionally, the first circuit board 30 includes a flexible printed circuit board (FPC). Optionally, the first circuit board 30 includes a printed circuit board (PCB). The first circuit board 30 can collect information from the electrode terminals 213 and transmit it to the second circuit board 13, such as voltage and current information.

[0098] In one embodiment, the first circuit board 30 is provided with a plurality of first conductive sheets 32, which are connected to the first circuit board 30. Optionally, the first conductive sheet 32 ​​may be a copper foil disposed on the first circuit board 30, and the copper foil is connected to wiring on the first circuit board 30. Optionally, the first conductive sheet 32 ​​may be a conductive sheet disposed on the first circuit board 30, such as a copper busbar, and the conductive sheet is soldered to the first circuit board 30. Viewed along the direction X' opposite to the first direction, the first conductive sheet 32 ​​is located between the first hole 311 and the second hole 312. The first terminal 213b of the adjacent battery cell 21 passes through the first hole 311, and the second terminal 213c of the other battery cell 21 passes through the second hole 312. The welding portions 213a of the first terminal 213b and the welding portions 213a of the second terminal 213c are stacked and welded to the first conductive sheet 32. The first conductive sheet 32, the welding portions 213a of the first terminal 213b and the welding portions 213a of the second terminal 213c are stacked along the first direction X. The heat-conducting component 50 connects to the side of the welding portion 213a facing away from the first conductive sheet 32. Welding includes laser welding, ultrasonic welding, etc. In other embodiments, the welding portion 213a and the first conductive sheet 32 ​​can also be connected by other methods such as conductive adhesive.

[0099] In one embodiment, each weld portion 213a includes two first ends 2131 disposed along the second direction Y, and each first conductive sheet 32 ​​includes a second end 321 disposed along the second direction Y. When viewed along the direction X' opposite to the first direction X, along the second direction Y, the two first ends 2131 are located between the two second ends 321.

[0100] In one embodiment, each group of holes 31 further includes a third hole 313 extending through the first circuit board 30 along a first direction X. Some of the third holes 313 are arranged along a second direction Y, and some are arranged along a third direction Z. Optionally, at least one third hole 313 is configured to allow the first connector 70 to flow between the heat-conducting element 50 and the first circuit board 30, with at least a portion of the first connector 70 located within at least one third hole 313. Optionally, all third holes 313 are configured to allow the first connector 70 to flow between the heat-conducting element 50 and the first circuit board 30, with at least a portion of the first connector 70 located within the third hole 313, thereby improving heat dissipation.

[0101] In one embodiment, when viewed along a direction X' opposite to the first direction X, the third hole 313 is located within the first opening 40a, and the third hole 313 is separate from the first conductive sheet 32, further improving heat dissipation. In one embodiment, the first circuit board 30 is further provided with a second conductive sheet 33 and a third conductive sheet 34. Along the third direction Z, the electrode terminal 213 of one of the two outermost cells 21 in the first column of cells 21a is connected to the third conductive sheet 34, and the electrode terminal 213 of the other cell 21 in the two outermost cells 21 is connected to the second conductive sheet 33.

[0102] In one embodiment, the first circuit board 30 is further provided with a fourth conductive sheet 35. Along the third direction Z, the electrode terminal 213 of one of the two outermost cells 21 in the second row of cells 21b is connected to the third conductive sheet 34, and the electrode terminal 213 of the other outermost cell 21 is connected to the fourth conductive sheet 35. The third conductive sheet 34 connects the electrode terminals 213 of two cells 21 arranged along the second direction Y, for transmitting current from the first row of cells 21a to the second row of cells 21b, realizing a series connection or parallel connection between the first row of cells 21a and the second row of cells 21b. Optionally, along the first direction X, the thickness of the second conductive sheet 33, the thickness of the third conductive sheet 34, and the thickness of the fourth conductive sheet 35 are all greater than the thickness of the first conductive sheet 32. By increasing the thickness of the second conductive sheet 33, the third conductive sheet 34, and the fourth conductive sheet 35, the current transmission can be increased.

[0103] In one embodiment, the first circuit board 30 is further provided with a plurality of fourth holes 36, which are located at the middle position of the first circuit board 30 along the second direction Y. The battery pack 100 also includes a sampling harness 100a, which is connected to the first circuit board 30 through the plurality of fourth holes 36.

[0104] In one embodiment, the battery pack 100 further includes a first electrical connection portion 100b and a second electrical connection portion 100c, which are used for inputting or outputting electrical energy. Optionally, the first electrical connection portion 100b and the second electrical connection portion 100c are soldered to a first circuit board 30. Optionally, the first electrical connection portion 100b is connected to one of the first terminal 213b and the second terminal 213c, and the second electrical connection portion 100c is connected to the other. Optionally, the first electrical connection portion 100b and the second electrical connection portion 100c include copper busbars.

[0105] In one embodiment, the first electrical connection portion 100b includes a first conductive portion 110 and a first insulating portion 120. The first insulating portion 120 is sleeved on the first conductive portion 110, and both ends of the first conductive portion 110 extend out of the first insulating portion 120. Optionally, one end of the first conductive portion 110 extending out of the first insulating portion 120 is connected to the second conductive sheet 33, and the other end passes through the bracket 40 and the heat sink 60, and is connected to the first connection portion 131 of the second circuit board 13. Optionally, one end of the first conductive portion 110 extending out of the first insulating portion 120 is directly connected to the first circuit board 30, and the other end passes through the bracket 40 and the heat sink 60, and is connected to the first connection portion 131 of the second circuit board 13.

[0106] In one embodiment, the second electrical connection portion 100c includes a second conductive portion 130 and a second insulating portion 140. The second insulating portion 140 is sleeved on the second conductive portion 130, and both ends of the second conductive portion 130 extend out of the second insulating portion 140. Optionally, one end of the second conductive portion 130 extending out of the second insulating portion 140 is connected to a fourth conductive sheet 35, and the other end passes through the bracket 40 and the heat sink 60, and is connected to the first connection portion 131 of the second circuit board 13. Optionally, one end of the second conductive portion 130 extending out of the second insulating portion 140 is directly connected to the first circuit board 30, and the other end passes through the bracket 40 and the heat sink 60, and is connected to the second connection portion 132 of the second circuit board 13.

[0107] Please see Figure 9 , Figure 10 and Figures 13 to 16 In one embodiment, the bracket 40 includes a bracket body 41, which covers a portion of the first circuit board 30 and insulates the first circuit board 30. A first connector 70 is provided between the bracket body 41 and the first circuit board 30, and the bracket 40 and the first circuit board 30 are connected by the first connector 70, which further insulates the first circuit board 30.

[0108] Optionally, the bracket 40 is made of an insulating material. Alternatively, the bracket 40 is made of a metallic material and an insulating material, with the insulating material covering the outer surface of the metallic material.

[0109] In one embodiment, a first opening 40a penetrates the support body 41 along a first direction X. Viewed from the opposite direction X, at least a portion of the welded portion 213a is exposed through the first opening 40a. A heat-conducting element 50 is disposed at the first opening 40a, and along the first direction X, the projection of the heat-conducting element 50 coincides with the projection of the first opening 40a, and connects to the welded portion 213a exposed from the first opening 40a. Along the first direction X, the first conductive sheet 32, the welded portion 213a, and the heat-conducting element 50 are sequentially connected. Optionally, the heat-conducting element 50 covers the welded portion 213a exposed from the first opening 40a.

[0110] Optionally, when viewed in a direction opposite to the first direction X, at least some of the weld portions 213a on a plurality of first conductive sheets 32 spaced apart along the third direction Z are exposed in the same first opening 40a. Along the first direction X, the heat-conducting element 50 coincides with the first opening 40a and connects to the plurality of weld portions 213a exposed from the first opening 40a.

[0111] Optionally, the support body 41 is provided with a plurality of first openings 40a, which are spaced apart along the second direction Y. Each first opening 40a is provided with a heat-conducting element 50, and each heat-conducting element 50 is connected to the side of the welding part 213a opposite to the first conductive sheet 32.

[0112] In one embodiment, along the second direction Y, the first opening 40a includes two first edges 401. Viewed along the direction X' opposite to the first direction X, along the second direction Y, the two first edges 401 are located between two first ends 2131, and the side end of the welded portion 213a is away from the first opening 40a, reducing the possibility of burrs from the welded portion 213a piercing the heat-conducting element 50. Viewed along the direction X' opposite to the first direction X, along the second direction Y, the two first edges 401 are located between two second ends 321, and the side end of the first conductive sheet 32 ​​is away from the first opening 40a, reducing the possibility of burrs from the first conductive sheet 32 ​​piercing the heat-conducting element 50.

[0113] In one embodiment, the heat-conducting component 50 includes a first surface 50a and a second surface 50b disposed opposite to each other along a first direction X. The first surface 50a protrudes from a first opening 40a in a direction opposite to the first direction X, facilitating the connection of the welding portion 213a to the first surface 50a. The second surface 50b protrudes from the first opening 40a along the first direction X, facilitating the connection of the heat sink 60 to the second surface 50b. Heat from the electrode terminal 213 is conducted through the first surface 50a to the second surface 50b, and then through the second surface 50b to the heat sink 60, which is beneficial for heat conduction from the electrode terminal 213. Optionally, the first surface 50a is in contact with the electrode terminal 213, and the second surface 50b is in contact with the heat sink 60. Optionally, the first surface 50a is connected to the electrode terminal 213 by thermally conductive adhesive, and the second surface 50b is connected to the heat sink 60 by thermally conductive adhesive. Optionally, the heat-conducting component 50 includes a thermally conductive silicone pad. Optionally, the heat-conducting component 50 can be compressed; being in a compressed state further improves heat dissipation.

[0114] Optionally, the thermal conductivity of the heat-conducting component 50 is higher than that of the first connecting component 70, thereby improving the heat conduction effect of the heat-conducting component 50. The thermal conductivity of the heat-conducting component 50 is D, where 4W / (m·K)≤D≤6W / (m·K). The thermal conductivity D satisfies any one of the following: 4 W / (m·K), 4.1 W / (m·K), 4.2 W / (m·K), 4.3 W / (m·K), 4.4 W / (m·K), 4.5 W / (m·K), 4.6 W / (m·K), 4.7 W / (m·K), 4.8 W / (m·K), 4.9 W / (m·K), 5.0 W / (m·K), 5.1 W / (m·K), 5.2 W / (m·K), 5.3 W / (m·K), 5.4 W / (m·K), 5.5 W / (m·K), 5.6 W / (m·K), 5.7 W / (m·K), 5.8 W / (m·K), 5.9 W / (m·K), and 6.0 W / (m·K).

[0115] In one embodiment, the bracket 40 has a second opening 42 extending through the bracket body 41 along the first direction X. The first electrical connection portion 100b extends through the second opening 42 to the side of the bracket 40 away from the first circuit board 30. Optionally, the bracket 40 has a first protrusion 402 located at the edge of the second opening 42, which positions the first electrical connection portion 100b. Along the second direction Y, the projection of the portion of the first conductive portion 110 extending beyond the first insulating portion 120 lies within the projection of the first protrusion 402. The first protrusion 402 insulates the portion of the first conductive portion 110 extending beyond the first insulating portion 120, reducing the risk of short circuits in this portion. Optionally, along the second direction Y, the projection of the first insulating portion 120 overlaps with the projection of the first protrusion 402, increasing the length of the first protrusion 402 along the first direction X, further enhancing the insulation of the portion of the first conductive portion 110 extending beyond the first insulating portion 120.

[0116] In one embodiment, the bracket 40 has a third opening 43 extending through the bracket body 41 along the first direction X. The second electrical connection portion 100c extends through the third opening 43 to the side of the bracket 40 away from the first circuit board 30. Optionally, the bracket 40 has a second protrusion 403 located at the edge of the third opening 43. The second protrusion 403 positions and insulates the second electrical connection portion 100c. Along the second direction Y, the projection of the portion of the second conductive portion 130 extending out of the second insulating portion 140 lies within the projection of the second protrusion 403. The second protrusion 403 insulates the portion of the second conductive portion 130 extending out of the second insulating portion 140, reducing the risk of short circuits in this portion. Optionally, along the second direction Y, the projection of the second insulating portion 140 overlaps with the projection of the second protrusion 403, increasing the length of the second protrusion 403 along the first direction X, further enhancing the insulation of the portion of the second conductive portion 130 extending out of the second insulating portion 140.

[0117] In one embodiment, the bracket 40 has a fourth opening 45. Along the first direction X, the fourth opening 45 penetrates the bracket body 41 for the sampling cable 100a to pass through. Along the second direction Y, the fourth opening 45 is located at the middle position of the bracket body 41. Along the third direction Z, guide plates 451 are provided on both sides of the fourth opening 45. The sampling cable 100a passes through the fourth opening 45 between the two guide plates 451, which facilitates the positioning and guidance of the sampling cable 100a.

[0118] Please see Figure 3 , Figure 13 , Figure 14 , Figures 18 to 20 In one embodiment, the bracket 40 includes a first protrusion 46 along a first direction X. The first protrusion 46 is disposed on the side of the bracket body 41 facing the heat sink 60, and the first protrusion 46 connects to the heat sink 60, so that there is a first gap 40b between the bracket body 41 and the heat sink 60. A first connector 70 is disposed in the first gap 40b to connect the bracket 40 and the heat sink 60, and to seal and insulate the space between the bracket 40 and the heat sink 60.

[0119] In one embodiment, the bracket 40 includes a second protrusion 47. The second protrusion 47 is disposed on the side of the bracket body 41 facing the first circuit board 30 in a direction opposite to the first direction X. The second protrusion 47 connects to the first circuit board 30, creating a second gap 40c between the bracket body 41 and the first circuit board 30. A first connector 70 is disposed in the second gap 40c to connect the bracket 40 and the second gap 40c, and to seal and insulate the space between the bracket 40 and the second gap 40c.

[0120] In one embodiment, the support 40 includes a first through hole 48 extending through the support body 41 along a first direction X. The first through hole 48 is configured to allow a first connector 70 to flow into a first gap 40b, and at least a portion of the first connector 70 is disposed in the first through hole 48. Optionally, multiple first through holes 48 are provided, arranged along a third direction Z, which is beneficial for improving the injection efficiency of the first connector 70. Optionally, at least one first through hole 48 is configured to allow the first connector 70 to flow into the first gap 40b, and the first connector 70 is disposed in at least one first through hole 48. Optionally, multiple first through holes 48 are configured to allow the first connector 70 to flow into the first gap 40b, and at least a portion of the first connector 70 is disposed in multiple first through holes 48.

[0121] In one embodiment, when viewed along a direction X' opposite to the first direction X, at least a portion of the electrode terminal 213 is located in the first through hole 48, further improving heat dissipation of the electrode terminal 213.

[0122] In one embodiment, when viewed along a direction X' opposite to the first direction X, at least a portion of the first conductive sheet 32 ​​is located in the first through hole 48, further improving heat dissipation of the first conductive sheet 32.

[0123] In one embodiment, the bracket 40 includes a plurality of second through holes 49 extending through the bracket body 41 along a first direction X. Optionally, at least one second through hole 49 may contain a first connector 70. Alternatively, the plurality of second through holes 49 may contain the first connector 70.

[0124] Optionally, along the first direction X, the projection of the second through hole 49 overlaps with the projection of the second conductive sheet 33. That is, when viewed from the opposite direction to the first direction X, a portion of the second conductive sheet 33 is located within the second through hole 49. The projection of the second through hole 49 also overlaps with the projection of the welding portion 213a connecting the electrode terminal 213 of the second conductive sheet 33. That is, when viewed from the opposite direction to the first direction X, a portion of the welding portion 213a connected to the second conductive sheet 33 is located within the second through hole 49. Through the first connector 70 within the second through hole 49, the heat from the electrode terminal 213 connecting the second conductive sheet 33 and the second conductive sheet 33 are conducted to the heat sink 60, which is beneficial for heat dissipation.

[0125] Optionally, along the first direction X, the projection of the second through hole 49 overlaps with the projection of the third conductive sheet 34. That is, when viewed from the opposite direction to the first direction X, a portion of the third conductive sheet 34 is located within the second through hole 49. The projection of the second through hole 49 also overlaps with the projection of the welding portion 213a of the electrode terminal 213 connecting the third conductive sheet 34. That is, when viewed from the opposite direction to the first direction X, a portion of the welding portion 213a connected to the third conductive sheet 34 is located within the second through hole 49. The heat from the electrode terminal 213 connecting the third conductive sheet 34 and the third conductive sheet 34 is conducted to the heat sink 60 through the first connector 70 within the second through hole 49, which is beneficial for heat dissipation.

[0126] Optionally, along the first direction X, the projection of the second through hole 49 overlaps with the projection of the fourth conductive sheet 35. That is, when viewed from the opposite direction to the first direction X, a portion of the fourth conductive sheet 35 is located within the second through hole 49. The projection of the second through hole 49 also overlaps with the projection of the welding portion 213a of the electrode terminal 213 connecting the fourth conductive sheet 35. That is, when viewed from the opposite direction to the first direction X, a portion of the welding portion 213a connected to the fourth conductive sheet 35 is located within the second through hole 49. Through the first connector 70 within the second through hole 49, the heat from the electrode terminal 213 connecting the fourth conductive sheet 35 and the heat from the fourth conductive sheet 35 itself are conducted to the heat sink 60, which is beneficial for heat dissipation.

[0127] In one embodiment, the bracket 40 includes a third protrusion 40d. The bracket body 41 includes a first side 411 and a second side 412 disposed along a third direction Z. Optionally, the first side 411 is provided with a third protrusion 40d. Along the third direction Z, the projection of the third protrusion 40d overlaps with the projection of the first circuit board 30, and the third protrusion 40d restricts the position of the bracket 40 connected to the first circuit board 30, facilitating assembly. Optionally, along the third direction Z, the projection of the first circuit board 30 is located within the projection of the third protrusion 40d. Optionally, along the third direction Z, the projection of the third protrusion 40d overlaps with the projections of the cell housing 211 and the electrode terminal 213, which can insulate the electrode terminal 213. Optionally, along the third direction Z, the projection of the solder portion 213a is located within the projection of the third protrusion 40d, further strengthening the insulation.

[0128] Optionally, the second side 412 is provided with a third protrusion 40d. Along the third direction Z, the projection of the third protrusion 40d overlaps with the projection of the first circuit board 30. The third protrusion 40d further restricts the position of the bracket 40 connected to the first circuit board 30, facilitating assembly. Optionally, along the third direction Z, the projection of the first circuit board 30 is located within the projection of the third protrusion 40d. Optionally, along the third direction Z, the projection of the third protrusion 40d overlaps with the projections of the cell housing 211 and the electrode terminal 213, further insulating the electrode terminal 213. Optionally, along the third direction Z, the projection of the solder portion 213a is located within the projection of the third protrusion 40d, further strengthening insulation.

[0129] Please see Figure 3 , Figure 9 , Figure 10 and Figure 17 In one embodiment, the heat sink 60 has a plurality of first channels 60a arranged along a second direction Y. The heat sink 60 is provided with a first receiving space 61. Optionally, one of the two outermost first channels 60a arranged along the second direction Y communicates with the first receiving space 61. Optionally, the heat sink 60 is provided with a second receiving space 62, which communicates with another outermost first channel 60a.

[0130] In one embodiment, the thermal conductivity of the heat sink 60 is higher than that of the heat conductor 50, which is beneficial to improving the heat dissipation of the battery pack 100.

[0131] In one embodiment, when the bracket 40 is connected to the heat sink 60, the first protrusion 402 is disposed within the first receiving space 61, and along the first direction X, the projection of the first protrusion 402 is located within the projection of the first receiving space 61. The first electrical connection portion 100b passes through the first receiving space 61. Optionally, the heat sink 60 is provided with a third receiving space 63, and the sampling harness 100a passes through the third receiving space 63.

[0132] In one embodiment, a second insulating member 80 is provided within the first receiving space 61 to seal the first receiving space 61, thereby restricting the flow of the first insulating material from the first receiving space 61 when the first insulating material is injected. Optionally, the second insulating member 80 is configured to cure the curable second insulating material after it is placed in the first receiving space 61. Optionally, the second insulating member 80 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the second insulating member 80 includes expanding foam. A first protrusion 402 is provided within the first receiving space 61 to further restrict the flow of the second insulating material, reducing the inflow of the second insulating material from the second opening 42 between the support 40 and the first circuit board 30. Along the first direction X, the second insulating member 80 protrudes from the heat sink 60.

[0133] In one embodiment, a third insulating member 81 is provided within the second receiving space 62 to seal the second receiving space 62, thereby restricting the flow of the first insulating material from the second receiving space 62 when the first insulating material is injected. Optionally, the third insulating member 81 is configured to cure the curable third insulating material after it has been fixed in the second receiving space 62. Optionally, the third insulating member 81 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the third insulating member 81 includes expanding foam. A second protrusion 403 is provided within the second receiving space 62 to further restrict the flow of the third insulating material, reducing the flow of the third insulating material from the third opening 43 between the support 40 and the first circuit board 30. In the first direction X, the third insulating member 81 protrudes from the heat sink 60.

[0134] In one embodiment, a fourth insulating member 82 is provided within the third accommodating space 63 to seal the third accommodating space 63, thereby restricting the outflow of the first insulating material from the third accommodating space 63 during injection. Optionally, the fourth insulating member 82 is configured to be formed by fixing a curable fourth insulating material in the third accommodating space 63 and then curing it. Optionally, the fourth insulating member 821 includes one of polyurethane adhesive, epoxy adhesive, and silicone adhesive. Optionally, the fourth insulating member 82 includes expanding foam. In a first direction X, the fourth insulating member 82 protrudes from the heat sink 60.

[0135] In one embodiment, the two outermost first channels 60a arranged along the second direction Y are provided with a fourth protrusion 64. The fourth protrusion 64 contacts and connects to the first protrusion 402, which can position the first protrusion 402 and thus position the first electrical connection 100b. It can also reserve space to facilitate the injection of the second insulating member 80.

[0136] In one embodiment, the outer surface of the heat sink 60 includes a layer of metallic material, such as aluminum, to facilitate heat dissipation. Optionally, the heat sink 60 may be made of metallic material, and the outer surface of the heat sink 60 may be coated with an insulating layer. Alternatively, the heat sink 60 may be made of metallic material, and the outer surface of the heat sink 60 may include a layer of metallic material.

[0137] In one embodiment, when the first insulating material is poured in an inverted manner, the battery cell 21, the first circuit board 30, the bracket 40, the heat conductor 50, and the heat sink 60 are first installed on the first housing 11, and the heat sink 60 is connected to the first housing 11. Then, the second insulating material is injected into the first receiving space 61, the third insulating material is injected into the second receiving space 62, and the fourth insulating material is injected into the third receiving space 63. After the second, third, and fourth insulating materials have solidified, the heat sink 60 is sealed. Then, the first housing 11 is inverted, and the flowing first insulating material is injected into the battery pack 100 from the bottom of the battery cell assembly 20 along the first direction X. After the first insulating material has solidified, it forms the first connector 70. Then, the bottom wall 115 is connected and fixed to the first wall 111, the second wall 112, the third wall 113, and the fourth wall 114.

[0138] Please see Figure 20 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.

[0139] 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, the housing assembly including a first housing, the first housing including a first wall and a second wall disposed along a third direction, a third wall and a fourth wall disposed along a second direction, and a bottom wall, the bottom wall connecting the first wall, the second wall, the third wall and the fourth wall to form a first space; A battery cell assembly is housed in the first space. The battery cell assembly includes a plurality of battery cells. Each battery cell includes a battery cell housing, an electrode assembly disposed within the battery cell housing, and an electrode terminal connected to the electrode assembly and extending out of the battery cell housing. The electrode terminal has a weld portion extending out of the battery cell housing. The bracket has a first opening; A heat-conducting component is disposed at the first opening, the heat-conducting component includes a first surface and a second surface disposed opposite to each other along a first direction, the first surface being connected to the welding part; The first direction is perpendicular to the second direction and the third direction. Heat sink, the second surface is connected to the heat sink; The first housing is provided with a first opening and a second opening, the first opening and the second opening are connected to the outside, and the heat sink is provided with a first channel, the first channel is connected to the first opening and the second opening; The second opening is located on the second wall, and the first opening is located on the third wall, or the first opening is located on the first wall and the second opening is located on the second wall.

2. The battery pack as described in claim 1, characterized in that, The battery pack includes a first circuit board, which is disposed within the housing assembly and connected to the cell assembly. The first circuit board is disposed between the cell housing and the bracket. The heat sink is located on the side of the bracket away from the first circuit board.

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

4. The battery pack according to any one of claims 1 to 3, characterized in that, The first surface protrudes from the first opening in a direction opposite to the first direction, and the second surface protrudes from the first opening in the first direction and is connected to the heat sink.

5. The battery pack according to any one of claims 1 to 4, characterized in that, The battery pack includes a first connector, which is partially disposed between the first circuit board and the bracket, and the bracket and the first circuit board are connected through the first connector.

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

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

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

9. The battery pack according to any one of claims 1 to 8, characterized in that, The heat-conducting element can be compressed, and the heat-conducting element is in a compressed state.

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

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