Battery packs and electrical equipment

Abstract

An embodiment of the present application provides a battery pack and an electric device, the battery pack comprising a case assembly, a first connection member, and a cell assembly. The case assembly has a first space, and the case assembly is provided with a first opening and a second opening communicating with the first space. The first connection member is housed in the first space. A first passage is provided in the first connection member. The first opening and the second opening are communicated by the first passage. At least a portion of the cell assembly is provided in the first space. A projection of the first opening and a projection of the second opening are away from the projection of the cell assembly along a first direction. Here, the first direction is the stacking direction of the cells in the cell assembly. Heat from the cell assembly in the battery pack is dissipated to the external environment by external air flowing through the first passage, improving the heat dissipation efficiency of the cell assembly.

Description

[Technical Field]

[0001] This application relates to the field of energy storage, and in particular to battery packs and electrical devices. [Background technology]

[0002] Since a battery pack generates a large amount of heat during use, it is necessary to dissipate the heat from the battery pack in order to prevent the temperature of the battery pack from becoming too high. Conventional heat dissipation methods involve adding heat dissipation components between the cells, but this method has a slow heat dissipation speed and a limit to the heat dissipation of the battery pack, which also affects the battery device using the battery pack. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of this, it is necessary to provide a battery pack and an electrical device that improves the heat dissipation efficiency of the battery. [Means for solving the problem]

[0004] An embodiment of the present application provides a battery pack, the battery pack comprising a case assembly, a first connection member, and a cell assembly. The case assembly has a first space, and the case assembly is provided with a first opening and a second opening communicating with the first space. The first connection member is housed in the first space. A first passage is provided in the first connection member. The first opening and the second opening are communicated by the first passage. At least a portion of the cell assembly is provided in the first space. A projection of the first opening and a projection of the second opening are spaced apart from the projection of the cell assembly along a first direction. Here, the first direction is the stacking direction of the cells in the cell assembly. Heat from the cell assembly in the battery pack is dissipated to the external environment by external air flowing through the first passage, improving the heat dissipation efficiency of the cell assembly.

[0005] Preferably, in some embodiments of the present application, the case assembly includes a first case. The first case 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 the 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 side by side in a first direction. The third side wall and the fourth side wall are arranged side by side in a second direction. The first direction is perpendicular to the second direction.

[0006] Preferably, in some embodiments of the present application, there is an overlapping portion between the projection of the first opening and the projection of the second opening along the first direction, thereby shortening the path of the first passage and allowing external air to pass through the first passage quickly to dissipate heat from the cell assembly and improve heat dissipation efficiency.

[0007] Preferably, in some embodiments of the present application, when the projection of the first opening and the projection of the second opening overlap along the first direction, the path of the first passage is the shortest and the intake and exhaust air volumes of the first opening and the second opening are increased, further improving the heat dissipation efficiency.

[0008] Preferably, in some embodiments of the present application, the first connection member includes a first portion. A first passage is provided in the first portion. The first portion is located between the third side wall and the fourth side wall along the second direction. By thermally connecting the first portion and the cell assembly, heat from the cell assembly is conducted to the first portion, and external air flows through the first passage to dissipate the heat to the external environment, thereby improving heat dissipation efficiency of the cell assembly.

[0009] Preferably, in some embodiments of the present application, the first connecting member includes a second portion connected to the first portion. The cell assembly is located between the first wall and the second portion along a third direction. Here, the third direction is perpendicular to both the first direction and the second direction. A portion of the heat of the cell assembly is conducted to the first wall, where the first wall dissipates the heat to the external environment, a portion of the heat of the cell assembly is conducted to the second portion, and from the second portion to the first portion, where the heat of the first portion is dissipated by air flowing in the first passage, thereby improving heat dissipation.

[0010] Preferably, in some embodiments of the present application, the cell assembly includes a first row of cell modules. The first row of cell modules includes a plurality of cells stacked along a first direction. The cells include a cell case, an electrode assembly provided in the cell case, and an electrode terminal connected to the electrode assembly and extending from the cell case.

[0011] Preferably, in some embodiments of the present application, the cell assembly further includes a second row of cell modules. The first row of cell modules and the second row of cell modules are arranged side by side in the second direction. A first portion is arranged between the first row of cell modules and the second row of cell modules along the second direction, and the first portion dissipates heat to the first row of cell modules and the second row of cell modules.

[0012] Preferably, in some embodiments of the present application, the first portion includes a first surface and a second surface arranged along the second direction, where a projection of the first surface and a projection of the cell modules of the first row overlap along the second direction, and a projection of the second surface and a projection of the cell modules of the second row overlap along the second direction, whereby heat is dissipated by conducting heat from the cell modules of the first row via the first surface and conducting heat from the cell modules of the second row via the second surface.

[0013] Preferably, in some embodiments of the present application, along the first direction, the projection of the cell modules of the first row is located within the projection of the first surface, and the projection of the cell modules of the second row is located within the projection of the second surface, such that each side of the cell modules of the first row can conduct heat with the first surface, and each side of the cell modules of the second row can conduct heat with the second surface, thereby further improving heat dissipation.

[0014] Preferably, in some embodiments of the present application, a thermally conductive adhesive is provided between the first portion and the first row of cell modules, which allows heat to be rapidly conducted to the first connecting member, further improving heat dissipation.

[0015] Preferably, in some embodiments of the present application, a thermally conductive adhesive is provided between the first portion and the second row of cell modules to rapidly conduct heat to the first connecting member and further improve heat dissipation.

[0016] Preferably, in some embodiments of the present application, the first connecting member further includes a third portion. The third portion is connected to the first portion. A first row of cell modules is located between the second portion and the first wall along the third direction. A second row of cell modules is located between the third portion and the first wall. A portion of the heat of the second row of cell modules is conducted to the first wall and dissipated to the external environment by the first wall, and a portion of the heat of the second row of cell modules is conducted to the third portion and from the third portion to the first portion, and the heat of the first portion is dissipated by air flowing in the first passage, thereby improving heat dissipation.

[0017] Preferably, in some embodiments of the present application, the first portion further includes a second passage. The second passage penetrates the first portion along the first direction. The first passage and the second passage are spaced apart along the third direction. By providing the second passage, both the first passage and the second passage can dissipate heat to the cell, further improving heat dissipation efficiency.

[0018] Preferably, in some embodiments of the present application, the battery pack further includes a first conductive member. The second portion has a first notch. The third portion has a second notch. One end of the first conductive member is connected to the cell modules in the first row and the other end is connected to the cell modules in the second row. A portion of the first conductive member is provided through the first notch, and a portion of the first conductive member is provided through the second notch.

[0019] Preferably, in some embodiments of the present application, the battery pack further includes a first insulating member and a first relay plate. The first relay plate is connected to the electrode terminals. The first insulating member is provided on a side of the first relay plate that faces away from the cell assembly. Along the second direction, a projection of the first relay plate and a projection of the first insulating member overlap each other. A projection of the electrode terminals and a projection of the first insulating member overlap each other. This provides insulation protection for the first conductive sheet and the electrode terminals.

[0020] Preferably, in some embodiments of the present application, a first thermally conductive layer is provided between the first relay plate and the cell casing. A projection of the electrode terminal and a projection of the first thermally conductive layer overlap in the first direction. The first thermally conductive layer fixes, insulates, and conducts heat to the electrode terminal between the cell casing and the first relay plate.

[0021] Preferably, in some embodiments of the present application, a second thermally conductive layer is provided between the first insulating member and the first relay plate. A projection of the electrode terminal and a projection of the second thermally conductive layer overlap in the first direction. This allows the second thermally conductive layer to fix, insulate, and conduct heat to the welded portion, the first conductive member, and the first conductive sheet.

[0022] Preferably, in some embodiments of the present 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 by pouring and curing a flowing insulating material.

[0023] Preferably, in some embodiments of the present application, the second portion is located on a side of the first insulating member away from the first relay plate. A third thermally conductive layer is provided between the second portion and the first insulating member. Heat from the first row of cell modules is transferred from the second thermally conductive layer to the third thermally conductive layer, from the third thermally conductive layer to the first connecting member, and dissipated by the first connecting member. Adding the third thermally conductive layer can improve the efficiency with which heat from the cells is transferred to the first connecting member.

[0024] An embodiment of the present application further provides an electric device including the battery pack according to any one of the above embodiments.

[0025] The heat of the cell assemblies in the above-mentioned battery pack and electrical equipment is dissipated to the external environment by the external air flowing through the first passage, thereby improving the heat dissipation efficiency of the cell assemblies. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 shows a structural schematic diagram of a battery pack according to some embodiments. [Figure 2] FIG. 2 shows a structural schematic diagram of a battery pack according to some embodiments from another perspective. [Figure 3] FIG. 3 shows an exploded schematic view of a battery pack according to some embodiments. [Figure 4] FIG. 4 shows an exploded schematic view of a case assembly according to some embodiments. [Figure 5] FIG. 5 shows a cross-sectional schematic view of a case assembly according to some embodiments. [Figure 6] FIG. 6 shows a schematic cross-sectional view of the battery pack of FIG. 1 taken along line II-II. [Figure 7] FIG. 7 shows a structural schematic diagram of the first row of cell modules and the first relay board in some embodiments. [Figure 8] FIG. 8 shows a schematic diagram of the structure of a cell in some embodiments. [Figure 9] FIG. 9 shows an exploded schematic view of a cell according to some embodiments. [Figure 10]FIG. 10 shows a structural schematic diagram of the battery pack after removing the case assembly in some embodiments. [Figure 11] FIG. 11 shows a structural schematic diagram of the battery pack after the first connecting member of FIG. 10 has been removed. [Figure 12] FIG. 12 shows an exploded schematic view of a battery pack after removing the case assembly in some embodiments. [Figure 13] FIG. 13 shows a structural schematic diagram of a first insulating member according to some embodiments. [Figure 14] FIG. 14 shows a structural schematic diagram of the second insulating member in some embodiments. [Figure 15] FIG. 15 is a schematic cross-sectional view of the battery pack of FIG. 1 taken along line III-III. [Figure 16] FIG. 16 shows an enlarged schematic view of part IV in FIG. [Figure 17] FIG. 17 shows a cross-sectional schematic view of a battery pack according to another embodiment taken along line III-III of FIG. [Figure 18] FIG. 18 shows an enlarged schematic view of part V in FIG. [Figure 19] FIG. 19 shows a structural schematic diagram of a first connecting member according to some embodiments. [Figure 20] FIG. 20 shows a structural schematic diagram of the first connecting member of some embodiments from another perspective. [Figure 21] FIG. 21 shows a structural schematic diagram of an electric device according to some embodiments.

[0027] The following specific examples further illustrate the present application with reference to the above-mentioned figures. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. However, it is clear that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments.

[0029] When a component is considered to be "mounted" on another component, it may be mounted directly on the other component, but it may also be co-existing with the other component. When a component is considered to be "connected" to another component, it may be connected directly to the other component, but it may also be co-existing with the other component.

[0030] It is understood that the term "perpendicular" is used to describe an ideal state between two parts. In actual manufacturing or use, a nearly perpendicular state may exist between two parts. For example, when describing perpendicularity based on numerical values, it indicates that the angle between two lines is in the range of 90°±10°, the dihedral angle between two planes is in the range of 90°±10°, or the angle between a line and a plane is in the range of 90°±10°. Two parts described as "perpendicular" do not need to be absolutely straight or flat, but can be approximately straight or flat. When viewed macroscopically, if the extension direction of the entire parts is straight or flat, they can be considered "straight" or "flat."

[0031] Unless otherwise stated, the term "plurality" as used herein when describing the number of parts specifically means two or more of those parts.

[0032] Unless otherwise stated, the meanings of all technical and scientific terms used herein are the same as those commonly understood by those skilled in the art. The terms used herein are intended only to describe specific embodiments and are not intended to limit the scope of the present application. The term "or / and" used herein includes any and all combinations of one or more of the associated listed items.

[0033] An embodiment of the present application provides a battery pack, the battery pack comprising a case assembly, a first connection member, and a cell assembly. The case assembly has a first space, and the case assembly is provided with a first opening and a second opening communicating with the first space. The first connection member is housed in the first space. A first passage is provided in the first connection member. The first opening and the second opening are communicated by the first passage. At least a portion of the cell assembly is provided in the first space. A projection of the first opening and a projection of the second opening are spaced apart from the projection of the cell assembly along a first direction. Here, the first direction is the stacking direction of the cells in the cell assembly. Heat from the cell assembly in the battery pack is dissipated to the external environment by external air flowing through the first passage, improving the heat dissipation efficiency of the cell assembly.

[0034] Hereinafter, several embodiments of the present application will be described in detail with reference to the drawings. If not contradictory, the following aspects and features in the embodiments may be combined with each other.

[0035] 1 to 5, one embodiment of the present application provides a battery pack 100 including a case assembly 10, a cell assembly 20, and a first connecting member 30. The case assembly 10 has a first space, and both the cell assembly 20 and the first connecting member 30 are disposed within the first space. The case assembly 10 further includes a first opening 11a and a second opening 11b communicating with the first space. The first connecting member 30 includes a first passage 30a, one end of which is connected to the first opening 11a and the other end of which is connected to the second opening 11b. A portion of the surface of the cell assembly 20 faces the first connecting member 30, allowing heat dissipation through the first connecting member 30. External air can enter the first passage 30a through the first opening 11a and be discharged through the second opening 11b. Alternatively, external air can enter the first passage 30a through the second opening 11b and be discharged through the first opening 11a. A portion of the heat from the cell assembly 20 is dissipated to the external environment as external air flows through the first passage. The remaining surface of the cell assembly 20 faces the inner wall of the case assembly 10, which dissipates a portion of the heat to the external environment and allows thermal conduction between each surface of the cell assembly 20 and the outside, improving the efficiency of heat dissipation to the cell assembly 20.

[0036] In one embodiment, the battery pack 100 can utilize external air to dissipate heat from the cell assemblies 20 through airflow. In one embodiment, when the battery pack 100 is in a stationary state, such as during charging, natural wind or an external air-cooling device can be used to dissipate heat. In one embodiment, the battery pack 100 can be used in devices that are in a dynamic state during use, such as drones and power-assisted cars. When the device is moving, the airflow becomes faster, allowing the battery pack 100 to dissipate heat more quickly.

[0037] 3, 4, 5, and 6, in one embodiment, case assembly 10 includes a first case 11, which defines a first space. First case 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. Both first side wall 112 and second side wall 113 are connected to first wall 111, and first side wall 112 and second side wall 113 are arranged side by side. Both third side wall 114 and fourth side wall 115 are connected to first wall 111, and third side wall 114 and fourth side wall 115 are arranged side by side. Furthermore, a third side wall 114 is connected to the first side wall 112 and the second side wall 113, and a fourth side wall 115 is connected to the third side wall 114 and the fourth side wall 115, forming a first space.

[0038] In one embodiment, the first case 11 and the first connecting member 30 include a thermally conductive material to improve heat dissipation characteristics. Preferably, the first case 11 and the first connecting member 30 include a metallic thermally conductive material and a thermally conductive insulating material, and the outer surface of the metallic thermally conductive material may be coated with the thermally conductive insulating material. Preferably, the metallic thermally conductive material of the first case 11 and the first connecting member 30 includes aluminum. Preferably, the first case 11 and the first connecting member 30 are made of a metallic material.

[0039] To better explain the configuration of the battery pack 100, the configuration of the battery pack 100 will be described based on X, Y, and Z coordinate axes. The X, Y, and Z coordinate axes are perpendicular to each other, with the X direction being a first direction, the Y direction being a second direction, and the Z direction being a third direction. Here, the first direction X is the direction in which the first side wall 112 and the second side wall 113 are arranged side by side, the second direction Y is the direction in which the third side wall 114 and the fourth side wall 115 are arranged side by side, the third direction Z is the direction perpendicular to the surface of the first wall 111, and the first direction X is perpendicular to both the second direction Y and the third direction Z.

[0040] In one embodiment, the first opening 11a penetrates the first side wall 112, and the second opening 11b penetrates the second side wall 113. In one embodiment, a projection of the first opening 11a and a projection of the second opening 11b overlap in the first direction X. Preferably, a projection of the first opening 11a and a projection of the second opening 11b partially overlap in the first direction X. Preferably, a projection of the first opening 11a and a projection of the second opening 11b overlap in the first direction X. The first side wall 112 is connected to the first connecting member 30, and the second side wall 113 is connected to the first connecting member 30. One end of the first passage 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 are overlapped along the first direction X, the path of the first passage 30a is shortest, and the intake and exhaust air volumes of the first opening 11a and the second opening 11b are increased, further improving heat dissipation. When the battery pack 100 moves in the opposite direction to the first direction X or the airflow direction of the external air-cooling device is aligned with the first direction X, the first opening 11a is an intake port and the second opening 11b is an exhaust port. Air enters through the first opening 11a, passes through the first passage 30a, and is exhausted through the second opening 11b, improving heat dissipation. Note that when the battery pack 100 moves along the first direction X or the airflow direction of the external air-cooling device is aligned with the first direction X, the second opening 11b is understood to be an intake port and the first opening 11a is understood to be an exhaust port. In another embodiment, the first opening 11 a is provided in the third side wall 114 and the second opening 11 b is provided in the fourth side wall 115 .

[0041] In another embodiment (not shown), the first opening 11a penetrates the first wall 111, and the second opening 11b penetrates the first side wall 112 and the second side wall 113. The first passage 30a has one end connected to the first opening 11a and the other end connected to the second opening 11b on the first side wall 112 and the second opening 11b on the second side wall 113, so that air enters through the first opening 11a on the first wall 111, passes through the first passage 30a, and is exhausted through the second opening 11b on the first side wall 112 and the second opening 11b on the second side wall 113. The additional exhaust port increases the exhaust air volume and improves heat dissipation. Air also enters through one of the second openings 11b on the first side wall 112 and the second openings 11b on the second side wall 113, and is discharged through the other second opening 11b and the first opening 11a, thereby improving heat dissipation.

[0042] In one embodiment, the first side wall 112 and the second side wall 113 are provided with a plurality of first connection holes 1121, and the first connecting member 30 is provided with a plurality of second connection holes 30b on both side surfaces along the first direction X. Fastening members such as screws (not shown) pass through the first connection holes 1121 and the second connection holes 30b to fixedly connect the first connecting member 30 to the first side wall 112 and the second side wall 113.

[0043] In one embodiment, the case assembly 10 further includes a second case 12, which has a second space and in which the first case 11 is disposed. The second case 12 improves the impact resistance of the battery pack 100 and reduces the risk of damage to the cell assembly 20 due to deformation of the first case 11 after impact. Preferably, the second case 12 includes a plastic case. Preferably, the second case 12 is formed by an injection molding process.

[0044] In one embodiment, the second case 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 the fifth side wall 122 and the sixth side wall 123 are arranged side by side along the first direction X. The seventh side wall 124 and the eighth side wall 125 are both connected to the second wall 121, and the seventh side wall 124 and the eighth side wall 125 are arranged side by side along the 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 has a first hole 12a, and the first case 11 is exposed through the first hole 12a, improving heat dissipation. Preferably, 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 all have a first hole 12a, improving heat dissipation. Furthermore, the multiple first holes 12a make the second case 12 mesh-like, reducing the amount of material used for the second case 12 and further reducing the weight of the second case 12, thereby further reducing the weight of the battery pack 100. It can be understood that the second case 12 itself contributes to the weight of the first case 11.

[0045] In one embodiment, the fifth side wall 122 is provided with a third opening 122a, and the sixth side wall 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 passage 30a. Along the first direction X, the projection of the first opening 11a and the projection of the third opening 122a overlap with each other. Preferably, the projections of the first opening 11a and the third opening 122a overlap with each other, thereby increasing the intake and exhaust airflow rates. Along the first direction X, the projections of the second opening 11b and the fourth opening 123a overlap with each other. Preferably, the projections of the second opening 11b and the fourth opening 123a overlap with each other, thereby increasing the intake and exhaust airflow rates. For example, when the battery pack 100 moves in the opposite direction to the first direction X or when the wind direction of the external air-cooling device is along the first direction X, air enters the first passage 30a through the third opening 122a and the first opening 11a and is discharged through the second opening 11b and the fourth opening 123a.

[0046] In one embodiment, the first case 11 and the second case 12 are connected by a clearance fit or an interference fit, with the outer surface of the first case 11 bonding to the inner surface of the second case 12 to facilitate fastening of the first case 11.

[0047] In one embodiment, the case assembly 10 includes a third case 13 and a support frame 14, the support frame 14 is connected to the first case 11 and the second case 12, and the third case 13 is connected to the support frame 14, thereby sealing the first case 11 within the second case 12. A fixing protrusion 12b is provided at the connection point between the seventh side wall 124 and the fifth side wall 122, a fixing protrusion 12b is provided at the connection point between the seventh side wall 124 and the sixth side wall 123, a fixing protrusion 12b is provided at the connection point between the eighth side wall 125 and the fifth side wall 122, and a fixing protrusion 12b is also provided at the connection point between the eighth side wall 125 and the sixth side wall 123. The support frame 14 is connected to the first side wall 112, the second side wall 113, the third side wall 114, and the fourth side wall 115, and the support frame 14 and the first wall 111 are arranged side by side in the third direction Z. The support frame 14 is fixedly connected to the fixing protrusions 12b by fastening members so as to restrict the first case 11 within the second case 12. The third case 13 is fixedly connected to the side of the support frame 14 that is away from the second case 12. When the second case 12 and / or the third case 13 needs to be replaced, the second case 12 and / or the third case 13 can be removed and replaced by loosening the fastening members.

[0048] In one embodiment, the battery pack 100 further includes a circuit board 40, which is provided within the third case 13. The circuit board 40 is electrically connected to the cell assemblies 20. Preferably, the circuit board 40 includes a BMS (Battery Management System) component. Specifically, the BMS component includes a plurality of electronic components that can perform functions such as data collection, control, protection, communication, power calculation, signal transmission, and power transmission for the battery.

[0049] In one embodiment, the case assembly 10 further includes a sealing member 15, which is connected to the first side wall 112, the second side wall 113, the third side wall 114, and the fourth side wall 115 on sides facing away from the first wall 111. When the support frame 14 is fixedly connected to the second case 12, the support frame 14 is pressed against the sealing member 15 in the third direction Z. Preferably, the sealing member 15 has a closed-loop structure, and a groove 151 is formed in the sealing member 15, and the sides facing away from the first wall 111 of the first side wall 112, the second side wall 113, the third side wall 114, and the fourth side wall 115 are all located within the groove 151. Along the first direction X, the projections of the first side wall 112 and the second side wall 113 overlap with the projections of the sealing member 15. Along the second direction Y, the projections of the third side wall 114 and the fourth side wall 115 and the projection of the sealing member 15 overlap each other.

[0050] In one embodiment, the sealing member 15 includes a first sealing portion 15a, a second sealing portion 15b, and a third sealing portion 15c. The first sealing portion 15a is provided between the inner surface of the first case 11 and the support frame 14. The second sealing portion 15b is provided between the outer surface of the first case 11 and the inner surface of the second case 12. The third sealing portion 15c is connected to the first sealing portion 15a and the second sealing portion 15b. The third sealing portion 15c is located between the support frame 14 and the first case 11, and the support frame 14 is connected to the third sealing portion 15c so as to be able to come into contact with the third sealing portion 15c.

[0051] In one embodiment, a first adhesive layer (not shown) is provided between the first sealing portion 15a and the inner surface of the first case 11, and a first adhesive layer is provided between the second sealing portion 15b and the outer surface of the first case 11, adhesively fixing the sealing member 15 to the first case 11. Preferably, the first adhesive layer includes a sealant. A second adhesive layer (not shown) is provided between the first sealing portion 15a and the support frame 14, a second adhesive layer is provided between the second sealing portion 15b and the inner surface of the second case 12, and a second adhesive layer is provided between the third sealing portion 15c and the support frame 14. Preferably, the second adhesive layer includes a sealant. The provision of the second adhesive layer strengthens the connection between the support frame 14 and the second case 12 and the sealing member 15, reducing the risk of short-circuiting the battery due to the intrusion of impurities such as moisture into the first case 11.

[0052] In one embodiment, the fifth side wall 122, the sixth side wall 123, the seventh side wall 124, and the eighth side wall 125 each have a first recess 12c at one end away from the second wall 121, and the second sealing portion 15b is provided within the first recess 12c. By providing the second sealing portion 15b within the first recess 12c, the extension path of the gap between the second sealing portion 15b and the side wall of the second case 12 is lengthened, further reducing the risk of battery short-circuiting due to moisture entering the first case 11. Taking the sixth side wall 123 as an example, the end of the sixth side wall 123 away from the second wall 121 is recessed along the first direction X to form the first recess 12c. Along the second direction Y, there is a portion where the projection of the second sealing portion 15b and the projection of the first recess 12c overlap. Preferably, the projection of the second sealing portion 15b is located within the projection of the first recess 12c. It can be understood that the depth of the first recess 12c along the first direction X is an additional extension path.

[0053] 6 to 10 , in one embodiment, the first opening 11a and the second opening 11b are provided on both sides of the cell assembly 20 along the first direction X. The cell assembly 20 includes a first row of cell modules 20a. The cell modules 20a in the first row are provided between the first side wall 112 and the second side wall 113, and the cell modules 20a in the first row are provided between the third side wall 114 and a portion of the first connecting member 30, and the cell modules 20a in the first row are further provided between the first wall 111 and a portion of the first connecting member 30. The cell modules 20a in the first row include a plurality of cells 21 stacked along the first direction X. Each cell 21 includes a cell casing 211, an electrode assembly 212 provided in the cell casing 211, and an electrode terminal 213 connected to the electrode assembly 212 and drawn out from the cell casing 211. In one embodiment, the cell casing 211 includes a first portion 211a and a second portion 211b, the first portion 211a houses the electrode assembly 212, the second portion 211b is connected to the first portion 211a, and the electrode terminal 213 extends from the second portion 211b.

[0054] In one embodiment, the cell casing 211 includes a first outer shell 2111 and a second outer shell 2112, and the first outer shell 2111 is 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 arranging the electrode assembly 212. The first outer shell 2111 and the second outer shell 2112 are foldable along a connection position (a position indicated by a dashed line), and the first outer shell 2111 and the second outer shell 2112 are overlapped to form a first portion 211a for covering 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 extension portion 2113 and the second extension portion 2114 overlap and are hermetically connected to form the second portion 211b. The second portion 211b includes a first sealing portion 2115 and a second sealing portion 2116, with the first sealing portion 2115 facing the connection position and an electrode terminal 213 extending from the first sealing portion 2115 to the first portion 211a. Preferably, the second portion 211b includes two second sealing portions 2116, which are arranged side by side along the second direction Y. Preferably, the second portion 211b includes one first sealing portion 2115, and the cell 21 includes two electrode terminals 213, which extend from the first sealing portion 2115 to the cell casing 211. In another embodiment, the first outer shell 2111 and the second outer shell 2112 are not integrally formed, the second portion 211b includes two first sealing portions 2115, and the two first sealing portions 2115 are arranged side by side along the third direction Z, and the cell 21 has two electrode terminals 213, one electrode terminal 213 extending from one of the first sealing portions 2115 through the cell casing 211, and the other electrode terminal 213 extending from the other first sealing portion 2115 through the cell casing 211, and the two electrode terminals 213 are arranged side by side along the third direction Z.

[0055] 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 another embodiment, the electrode assembly 212 may have a laminated structure, in which a positive electrode sheet, a separator, and a negative electrode sheet are sequentially stacked to form one electrode assembly unit, and multiple electrode assembly units are stacked in the electrode assembly 212. Preferably, the cell casing 211 includes an aluminum plastic film. Preferably, the cell 21 includes a soft-pack cell.

[0056] In one embodiment, the electrode terminal 213 has a weld portion 213a extending to the outside of the cell casing 211, and the weld portion 213a is formed by bending the electrode terminal 213. In one embodiment, the electrode terminal 213 has a first terminal 213b and a second terminal 213c, and the first terminal 213b and the second terminal 213c have opposite polarities, one of the first terminal 213b and the second terminal 213c is a positive terminal and the other is a negative terminal. Along the third direction Z, a projection of the weld portion 213a of the first terminal 213b of one cell 21 and a projection of the weld portion 213a of the second terminal 213c of an adjacent cell 21 at least partially overlap. The first terminal 213b and the second terminal 213c of adjacent cells 21 are bent opposite to each other, and the welded portion 213a of the first terminal 213b and the welded portion 213a of the second terminal 213c are stacked and connected to each other, so that adjacent cells 21 are connected in series. By connecting the welded portions 213a of adjacent cells 21 to each other, the number of processing steps is reduced. In another embodiment, adjacent cells 21 may be connected in parallel.

[0057] In one embodiment, a single cell 21 will be described as an example. The cell 21 includes a first side surface 21a, a second side surface 21b, a third side surface 21c, a fourth side surface 21d, a fifth side surface 21e, and a sixth side surface 21f. The first side surface 21a and the second side surface 21b are arranged side by side along the first direction X. The third side surface 21c and the fourth side surface 21d are arranged side by side along the second direction Y. The fifth side surface 21e and the sixth side surface 21f are arranged side by side along the third direction Z, and the electrode terminal 213 extends from the fifth side surface 21e. In one embodiment, the first side surface 21a faces the first side wall 112, and the second side surface 21b faces the second side wall 113. The third side surface 21c faces the third side wall 114. The fourth side surface 21d faces a portion of the first connecting member 30. The fifth side surface 21e faces toward other portions of the first connection member 30. The sixth side surface 21f faces toward the first wall 111. The first side surface 21a, the second side surface 21b, the third side surface 21c, the fourth side surface 21d, the fifth side surface 21e, and the sixth side surface 21f of the cell 21 can all conduct heat to the outside, improving heat dissipation for the cell assembly 20 and reducing the temperature of the battery pack 100. It can be understood that the above embodiment is similarly applied to the case of multiple cells 21.

[0058] In one embodiment, the first row of cell modules 20a further includes a first thermal conduction member 22a, and each cell 21 is thermally connected to at least one first thermal conduction member 22a, which is thermally connected to the first case 11 and the first connecting member 30. Heat from the cells 21 is conducted to the first case 11 and the first connecting member 30 by the first thermal conduction member 22a, and is then dissipated to the cells 21 by the first case 11 and the first connecting member 30. The first thermal conduction member 22a is connected to the first side surface 21a or the second side surface 21b and is bent to extend to the third side surface 21c, the fourth side surface 21d, and the sixth side surface 21f. The first thermal conduction member 22a located on the first side surface 21a is thermally connected to the first side wall 112. The first thermal conduction member 22a located on the second side surface 21b is thermally connected to the second side wall 113. The first thermally conductive member 22a located on the third side surface 21c is thermally connected to the third side wall 114. The first thermally conductive member 22a located on the fourth side surface 21d is thermally connected to the surface of the first connecting member 30. The first thermally conductive member 22a located on the sixth side surface 21f is thermally connected to the surface of the first wall 111. Heat from the cells 21 is transferred to the first connecting member 30 and the first case 11 by the first thermally conductive member 22a, improving the heat dissipation effect for the cells 21. In another embodiment, the first thermally conductive member 22a does not need to extend to the fourth side surface 21d, and the fourth side surface 21d is directly thermally connected to the first connecting member 30. Here, the thermal connection may be a heat transfer connection using a thermally conductive adhesive or the like. Alternatively, the thermal connection may be a thermal connection in which two structural members are in contact with each other and directly connected. For example, the first thermally conductive member 22a is in contact with and connected to the first case 11 and the first connecting member 30. Preferably, the first heat conducting member 22a comprises an aluminum sheet.

[0059] In one embodiment, an elastic member 23 is further provided between adjacent first heat conduction members 22a, and when the cells 21 expand, the elastic member 23 is compressed to provide an expansion space for the cells 21. Preferably, the elastic member 23 includes a foam.

[0060] In one embodiment, the cell assembly 20 further includes a second row of cell modules 20b, where the first row of cell modules 20a and the second row of cell modules 20b are arranged along the second direction Y. Along the second direction Y, the first connection member 30 is arranged between the first row of cell modules 20a and the second row of cell modules 20b. The second row of cell modules 20b is arranged between a portion of the first connection member 30 and the fourth side wall 115, and the second row of cell modules 20b is arranged between the first side wall 112 and the second side wall 113. The second row of cell modules 20b is further arranged between the first wall 111 and a portion of the first connection member 30. In one embodiment, the first connecting member 30 is thermally connected to the first row of cell modules 20a and the second row of cell modules 20b, and the heat from the first row of cell modules 20a and the second row of cell modules 20b is simultaneously transferred to the first connecting member 30 and can be rapidly dissipated through the first passage 30a.

[0061] In one embodiment, the structure of the cells 21 in the second row cell module 20b is the same as the structure of the cells 21 in the first row cell module 20a. The second row cell module 20b includes a plurality of cells 21 stacked in the first direction X, and each cell 21 is connected to the first connection member 30 and the first case 11 in contact with each other.

[0062] In one embodiment, the second row cell module 20b further includes a second thermal conductive member 22b, and the second thermal conductive member 22b has a structure that is essentially the same as that of the first thermal conductive member 22a. Preferably, the first connecting member 30 is connected to the first thermal conductive member 22a, and the first connecting member 30 is connected to the second thermal conductive member 22b, and the first connecting member 30 is located between the first thermal conductive member 22a and the second thermal conductive member 22b, thereby improving heat dissipation for the cell assembly 20.

[0063] 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 the first cell module 20a and the other end is connected to the second cell module 20b. Preferably, one end of the first conductive member 24 is connected to the first terminal 213b of the cell 21 in the first cell module 20a and the other end is connected to the second terminal 213c of the cell 21 in the second cell module 20b, thereby realizing a series connection between the first cell module 20a and the first cell module 20a. Preferably, one end of the first conductive member 24 is connected to the first terminal 213b of the cell 21 in the first cell module 20a and the other end is connected to the first terminal 213b of the cell 21 in the second cell module 20b, thereby realizing a parallel connection between the first cell module 20a and the first cell module 20a. A second recess 241 is provided in the first conductive member 24, and a part of the first connection member 30 is provided within the second recess 241.

[0064] 10 , 11 , and 12 , in one embodiment, the battery pack 100 further includes a first relay plate 50, to which a first row of cell modules 20a are connected. The first relay plate 50 is provided with a plurality of pairs of holes 51, and each pair of holes 51 includes a first communication hole 511 and a second communication hole 512 that are provided along the first direction X. The first communication hole 511 and the second communication hole 512 are provided to extend along the second direction Y. The first terminal 213b of an adjacent cell 21 passes through the first communication hole 511, and the second terminal 213c of the other cell 21 passes through the second communication hole 512. The welded portion 213a of the first terminal 213b and the welded portion 213a of the second terminal 213c are stacked on top of each other and connected to the first relay plate 50.

[0065] In one embodiment, the first relay board 50 comprises a circuit board. Preferably, the first relay board 50 includes a printed circuit board (PCB), and the first relay board 50 is provided with a plurality of conductors (not shown). Preferably, the first relay board 50 includes a flexible printed circuit (FPC).

[0066] Preferably, a plurality of first conductive sheets 52 are provided on the side of the first relay plate 50 away from the cells 21. The first conductive sheets 52 are provided between the first communication holes 511 and the second communication holes 512. The first terminals 213b of adjacent cells 21 pass through the first communication holes 511, and the second terminals 213c of the other cells 21 pass through the second communication holes 512. The welded portions 213a of the first terminals 213b and the welded portions 213a of the second terminals 213c are stacked together and welded to the first conductive sheet 52. Welding may include laser welding, ultrasonic welding, etc. In another embodiment, the welded portions 213a and the first conductive sheet 52 may be connected by other connection methods, such as a conductive adhesive.

[0067] Preferably, each set of holes 51 further includes a third communication hole 513, and when viewed along the third direction Z, the third communication hole 513 is located between adjacent first conductive sheets 52.

[0068] In one embodiment, the battery pack 100 further includes a first electrical connection portion 53 connected to the first relay board 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 provided on the first conductive portion 531. Both ends of the first conductive portion 531 extend to the first insulating portion 532. One end of the first conductive portion 531 is connected to the 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 integrally formed. In one embodiment, the first relay board 50 further includes a first sampling harness 54, which is connected to the circuit board 40. The first sampling harness 54 can collect information such as the current, voltage, and temperature of the cell 21.

[0069] 12, 13, and 14, in one embodiment, the battery pack 100 further includes a first insulating member 60. The first insulating member 60 is provided on the side of the first conductive sheet 52 that faces away from the cells 21, thereby insulating and protecting the first conductive sheet 52 and the electrode terminals 213. The first insulating member 60 includes a first main body 61 and a first side plate 62 extending from an edge of the first main body 61. A projection of the first relay plate 50 and a projection of the first main body 61 overlap in the third direction Z. Preferably, the projection of the first relay plate 50 is located within the projection of the first main body 61, so that the first main body 61 covers the first conductive sheet 52 and the electrode terminals 213. A projection of the first side plate 62 and a projection of the first relay plate 50 overlap in the first direction X or the second direction Y. Furthermore, 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 .

[0070] In one embodiment, a fifth opening 611 is provided in the first main body 61, and the fifth opening 611 penetrates the surface of the first main body 61 along the third direction Z. The first electrical connection portion 53 penetrates the fifth opening 611 and extends to a side of the first main body 61 away from the first relay plate 50. Preferably, a first protrusion 612 is provided in the first main body 61, and the first protrusion 612 is provided on the edge of the fifth opening 611 and regulates the position of the first electrical connection portion 53. A projection of the first conductive portion 531 is located within a projection of the first protrusion 612 along the second direction Y. The first protrusion 612 insulates one end of the first conductive portion 531 extending from the first insulating portion 532, thereby reducing the risk of short-circuiting the portion of the first conductive portion 531 extending from the first insulating portion 532. Preferably, there is an overlapping portion between the projection of the first insulating portion 532 and the projection of the first convex portion 612 along the second direction Y, which further improves insulation of the first conductive portion 531 from the extending portion.

[0071] In one embodiment, a sixth opening 613 is provided in the first body 61, and the sixth opening 613 penetrates the surface of the first body 61 along the third direction Z. The first conductive member 24 penetrates the sixth opening 613 and is connected to the first conductive sheet 52. Preferably, a second protrusion 614 is provided in the first body 61, and the second protrusion 614 is located at the edge of the sixth opening 613. A projection of the first conductive member 24 and a projection of the second protrusion 614 overlap in the second direction Y. The second protrusion 614 restricts the position of the first conductive member 24 and insulates it from the first conductive member 24. A portion of the structure of the second protrusion 614 is located between the first conductive member 24 and the first connecting member 30 along the second direction Y, reducing the risk of a short circuit due to connection between the first conductive member 24 and the first connecting member 30.

[0072] In one embodiment, a seventh opening 615 is provided in the first body 61, and the seventh opening 615 penetrates the surface of the first body 61. A third protrusion 616 is provided on the edge of the seventh opening 615, and the first sampling harness 54 penetrates the first body 61 through the seventh opening 615 and is connected to the circuit board 40.

[0073] 12 and 15 to 18, in one embodiment, a first thermally conductive layer 101 is provided between the cell casing 211 and the first relay plate 50. Along the first direction X, there is an overlapping portion between the projection of the electrode terminal 213 and the projection of the first thermally conductive layer 101, and the first thermally conductive layer 101 fixes, insulates, and conducts heat to the electrode terminal 213 between the cell casing 211 and the first relay plate 50.

[0074] In one embodiment, the first thermally conductive layer 101 is formed by injecting an insulating material into the battery pack 100 and curing it. Preferably, the first thermally conductive layer 101 includes at least one of a sealing material and a foam material. Preferably, the first thermally conductive layer 101 is formed by injecting a sealing material into the battery pack 100 and curing it. Preferably, the first thermally conductive layer 101 is formed by foaming a foam material. Preferably, the first thermally conductive layer 101 includes a resin, and is formed by heating and melting the resin, and then injecting a flowable resin between the cell casing 211 and the first relay plate 50 and curing it. Preferably, the first thermally conductive layer 101 is formed by using an injection molding process to dispense a flowable resin between the cell casing 211 and the first relay plate 50 and curing it. The first thermal conduction layer 101 fills the gap between the cell case 211 and the first relay plate 50, strengthens the insulation protection between the electrode terminal 213 and the first relay plate 50, and prevents foreign matter such as water and dust from entering between the cell case 211 and the first relay plate 50.

[0075] In one embodiment, a second thermally conductive layer 102 is provided between the first insulating member 60 and the first relay plate 50. Along the first direction X, there is an overlapping portion between the projection of the welded portion 213a of the electrode terminal 213 and the projection of the second thermally conductive layer 102, there is an overlapping portion between the projection of the first conductive sheet 52 and the projection of the second thermally conductive layer 102, and there is an overlapping portion between the projection of the first conductive member 24 and the second thermally conductive layer 102, and the second thermally conductive layer 102 fixes, insulates, and conducts heat to the welded portion 213a, the first conductive member 24, and the first conductive sheet 52.

[0076] In one embodiment, the second thermally conductive layer 102 is formed by injecting an insulating material into the battery pack 100 and curing it. Preferably, the second thermally conductive layer 102 includes at least one of a sealing material and a foam material. Preferably, the second thermally conductive layer 102 is formed by injecting a sealing material into the battery pack 100 and curing it. Preferably, the second thermally conductive layer 102 is formed by foaming a foam material. Preferably, the second thermally conductive layer 102 includes a resin and is formed by heating and melting the resin, and then injecting a flowable resin between the first insulating member 60 and the first relay plate 50 and curing it. Preferably, the second thermally conductive layer 102 is formed by using an injection molding process to apply a flowable resin between the cell casing 211 and the first relay plate 50 and curing it. The second thermal conduction layer 102 fills the gap between the first insulating member 60 and the first relay plate 50, strengthening the insulation protection between the first insulating member 60 and the first relay plate 50 and preventing foreign matter such as water or dust from entering between the first insulating member 60 and the first relay plate 50.

[0077] In one embodiment, the first connecting member 30 is provided on the side of the first insulating member 60 away from the first relay plate 50, and heat from the electrode terminals 213 is transferred by 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 connecting member 30. Preferably, a third thermally conductive layer (not shown) is provided between the first insulating member 60 and the first connecting member 30, and heat is transferred from the second thermally conductive layer 102 to the third thermally conductive layer and from the third thermally conductive layer to the first connecting member 30, where it is dissipated to the first row of cell modules 20a. The addition of the third thermally conductive layer can improve the efficiency with which heat from the cells 21 is transferred to the first connecting member 30. Preferably, the third thermally conductive layer includes a thermally conductive adhesive.

[0078] In one embodiment, a first through-hole 61a is provided in the first body 61, and the first through-hole 61a penetrates the first body 61. The flowing thermally conductive insulating material flows between the first insulating member 60 and the first connecting member 30 through the first through-hole 61a. In one embodiment, the third thermally conductive layer is formed by injecting an insulating material into the battery pack 100 and curing it. Preferably, the third thermally conductive layer includes at least one of a sealing material and a foaming material. Preferably, the third thermally conductive layer is formed by injecting a sealing material into the battery pack 100 and curing it. Preferably, the third thermally conductive layer is formed by foaming a foaming material. Preferably, the third thermally conductive layer includes a resin, and is formed by heating and melting the resin, and then providing a flowable resin to be injected between the first insulating member 60 and the first connecting member 30 and curing it. Preferably, the third thermally conductive layer is formed by using an injection molding process to provide and harden a fluid resin between the first insulating member 60 and the first connecting member 30. The third thermally conductive layer fills the gap between the first insulating member 60 and the first connecting member 30, strengthens the insulation protection between the first insulating member 60 and the first connecting member 30, and prevents foreign matter such as water or dust from entering between the first insulating member 60 and the first connecting member 30.

[0079] In one embodiment, the first thermally conductive layer 101, the second thermally conductive layer 102, and the third thermally conductive layer are formed by hardening the same material. First, a fast-curing, quick-drying insulating material, such as a quick-drying adhesive or foam, is injected into the fifth opening 611, the sixth opening 613, and the seventh opening 615. The first protrusion 612, the second protrusion 614, and the third protrusion 616 restrict the insulating material from flowing to other positions in the first body 61, and the hardened insulating material seals the fifth opening 611, the sixth opening 613, and the seventh opening 615. 10 , the battery pack 100 is then inverted in the direction opposite to the third direction Z. A fluid insulating material is then injected through the injection passage. The insulating material flows between the cell casing 211 and the first relay plate 50, and can flow between the first insulating member 60 and the first relay plate 50 through the first through-holes 511, 512, and 513. The fluid insulating material can then flow between the first insulating member 60 and the first connecting member 30 through the first through-holes 61a. The fluid insulating material between the first insulating member 60 and the first connecting member 30 hardens to form a third thermally conductive layer. The fluid insulating material between the first insulating member 60 and the first relay plate 50 hardens to form a second thermally conductive layer 102. The fluid insulating material between the cell casing 211 and the first relay plate 50 hardens to form a first thermally conductive layer 101. Preferably, when the battery pack 100 is inverted, the gaps between the cells 21 can serve as injection passages. When a fluid insulating material is injected through the injection passage, the first thermal conductive layer 101, the second thermal conductive layer 102, and the third thermal conductive layer are made of the same insulating material, and the first thermal conductive layer 101, the second thermal conductive layer 102, and the third thermal conductive layer are formed by a single injection process, thereby improving productivity.

[0080] In one embodiment, along the third direction Z, there is an overlapping portion between the projection of the first through hole 61a and the projection of the electrode terminal 213, which makes it easier for the thermally conductive insulating material to flow from the first through hole 61a between the first insulating member 60 and the first connecting member 30.

[0081] In one embodiment, a first bump 61b is provided on one side of the first body 61 facing the first relay plate 50. When the first insulating member 60 is connected to the first relay plate 50, the first bump 61b can be in contact with and connected to the first relay plate 50, and the support of the first bump 61b provides a gap for accommodating the second thermally conductive layer 102 between the first insulating member 60 and the first relay plate 50. It can be understood that by adjusting the length of the first bump 61b in the third direction Z, the size of the gap between the first insulating member 60 and the first relay plate 50 can be adjusted, and the thickness of the second thermally conductive layer 102 between the first insulating member 60 and the first relay plate 50 can be adjusted.

[0082] In one embodiment, the battery pack 100 further includes a second relay plate 70, which is connected to the second row of cell modules 20b. A plurality of second conductive sheets 71 are provided on the side of the second relay plate 70 away from the cells 21. The second relay plate 70 has a plurality of sets of holes, similar to the first relay plate 50. The first terminal 213b of an adjacent cell 21 penetrates the second relay plate 70, and the second terminal 213c of the other cell 21 penetrates the second relay plate 70. The welded portions 213a of the first terminals 213b and the welded portions 213a of the second terminals 213c are stacked together and welded to the second conductive sheet 71. Examples of welding include laser welding and ultrasonic welding. In another embodiment, the welded portions 213a and the second conductive sheet 71 may be connected by other methods, such as a conductive adhesive.

[0083] In one embodiment, the second relay board 70 comprises a circuit board. Preferably, the second relay board 70 includes a printed circuit board (PCB), and a plurality of conductors (not shown) are provided on the second relay board 70. Preferably, the second relay board 70 includes a flexible printed circuit (FPC).

[0084] In one embodiment, the battery pack 100 further includes a second electrical connection portion 72 connected to the second relay board 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 provided on the second conductive portion 721. Both ends of the second conductive portion 721 extend from the second insulating portion 722. One end of the second conductive portion 721 is connected to the 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 integrally formed. In one embodiment, the second relay board 70 is further 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 the current, voltage, and temperature of the cell 21.

[0085] In one embodiment, the battery pack 100 further includes a second insulating member 80. The second insulating member 80 is provided on the side of the second conductive sheet 71 that faces away from the cells 21, thereby insulating and protecting the second conductive sheet 71 and the electrode terminals 213. The second insulating member 80 includes a second main body 81 and a second side plate 82 extending from an edge of the second main body 81. A projection of the second relay plate 70 and a projection of the second main body 81 overlap in the third direction Z. Preferably, the projection of the second relay plate 70 is located within the projection of the second main body 81, so that the second main body 81 covers the second conductive portion 721 and the electrode terminals 213. A projection of the second side plate 82 and a projection of the second relay plate 70 overlap in the first direction X or the second direction Y. Furthermore, a projection of the second conductive sheet 71 is located within the projection of the second side plate 82 in the first direction X or the second direction Y.

[0086] In one embodiment, an eighth opening 811 is provided in the second main body 81, and the eighth opening 811 penetrates the surface of the second main body 81 along the third direction Z. The second electrical connection portion 72 penetrates the eighth opening 811 and extends to a side of the second main body 81 away from the second relay plate 70. Preferably, a fourth protrusion 812 is provided in the second main body 81, and the fourth protrusion 812 is provided on the edge of the eighth opening 811 and regulates the position of the second electrical connection portion 72. A projection of the second conductive portion 721 is located within a projection of the fourth protrusion 812 along the second direction Y. The fourth protrusion 812 insulates one end of the second conductive portion 721 extending from the second insulating portion 722, thereby reducing the risk of short-circuiting at the portion of the second conductive portion 721 extending from the second insulating portion 722. Preferably, there is an overlapping portion between the projection of the second insulating portion 722 and the projection of the fourth convex portion 812 along the second direction Y, which further improves insulation from the extending portion of the second conductive portion 721.

[0087] In one embodiment, a ninth opening 813 is provided in the second body 81, and the ninth opening 813 penetrates the surface of the second body 81 along the third direction Z. The first conductive member 24 penetrates the ninth opening 813 and is connected to the second conductive sheet 71. Preferably, a fifth protrusion 814 is provided in the second body 81, and the fifth protrusion 814 is located at the edge of the ninth opening 813. A projection of the first conductive member 24 and a projection of the fifth protrusion 814 overlap in the second direction Y. The fifth protrusion 814 restricts the position of the first conductive member 24 and provides insulation. A portion of the structure of the fifth protrusion 814 is located between the first conductive member 24 and the first connecting member 30 along the second direction Y, reducing the risk of a short circuit due to the connection between the first conductive member 24 and the first connecting member 30.

[0088] In one embodiment, a tenth opening 815 is provided in the second body 81, and the tenth opening 815 penetrates the surface of the second body 81. A sixth protrusion 816 is provided on the edge of the tenth opening 815, and the second sampling harness 73 penetrates the second body 81 through the tenth opening 815 and is connected to the circuit board 40.

[0089] In one embodiment, a fourth thermally conductive layer (not shown) is provided between the cell casing 211 and the second relay plate 70. Along the first direction X, there is an overlapping portion between the projection of the electrode terminal 213 and the projection of the fourth thermally conductive layer, and the electrode terminal 213 between the cell casing 211 and the second relay plate 70 is fixed, insulated, and thermally conductive via the fourth thermally conductive layer.

[0090] In one embodiment, the fourth thermally conductive layer is formed by injecting an insulating material into the battery pack 100 and curing it. Preferably, the fourth thermally conductive layer includes at least one of a sealing material and a foam material. Preferably, the fourth thermally conductive layer is formed by injecting a sealing material into the battery pack 100 and curing it. Preferably, the fourth thermally conductive layer is formed by foaming a foam material. Preferably, the fourth thermally conductive layer includes a resin and is formed by heating and melting the resin, and then injecting a fluid resin between the cell casing 211 and the second relay plate 70 and curing it. Preferably, the fourth thermally conductive layer is formed by using an injection molding process to apply a fluid resin between the cell casing 211 and the second relay plate 70 and curing it. The fourth thermally conductive layer fills the gap between the cell casing 211 and the second relay plate 70, strengthens insulation protection between the electrode terminals 213 and the second relay plate 70, and prevents foreign matter such as water and dust from entering between the cell casing 211 and the second relay plate 70.

[0091] In one embodiment, a fifth thermally conductive layer (not shown) is provided between the second insulating member 80 and the second relay plate 70. Along the first direction X, there is an overlapping portion between the projection of the welded portion 213a of the electrode terminal 213 and the projection of the fifth thermally conductive layer, there is an overlapping portion between the projection of the second conductive sheet 71 and the projection of the fifth thermally conductive layer, and there is an overlapping portion between the projection of the first conductive member 24 and the second thermally conductive layer 102, and the welded portion 213a, the first conductive member 24, and the second conductive sheet 71 are fixed, insulated, and thermally conductive via the fifth thermally conductive layer.

[0092] In one embodiment, the fifth thermally conductive layer is formed by injecting an insulating material into the battery pack 100 and curing it. Preferably, the fifth thermally conductive layer includes at least one of a sealing material and a foam material. Preferably, the fifth thermally conductive layer is formed by injecting a sealing material into the battery pack 100 and curing it. Preferably, the fifth thermally conductive layer is formed by foaming a foam material. Preferably, the fifth thermally conductive layer includes a resin, and is formed by heating and melting the resin, and then injecting a flowable resin between the second insulating member 80 and the second relay plate 70 and curing it. Preferably, the fifth thermally conductive layer is formed by using an injection molding process to dispense a flowable resin between the second insulating member 80 and the second relay plate 70 and curing it. The fifth thermal conduction layer fills the gap between the second insulating member 80 and the second relay plate 70, strengthening the insulation protection between the second insulating member 80 and the second relay plate 70 and preventing foreign matter such as water and dust from entering between the second insulating member 80 and the second relay plate 70.

[0093] In one embodiment, the first connecting member 30 is provided on the side of the second insulating member 80 away from the second relay plate 70, and heat from the electrode terminal 213 is transferred to the fifth thermally conductive layer via the fourth thermally conductive layer and then from the fifth thermally conductive layer to the first connecting member 30. Preferably, a sixth thermally conductive layer (not shown) is provided between the second insulating member 80 and the first connecting member 30, and heat from the electrode terminal 213 is transferred to the fifth thermally conductive layer via the fourth thermally conductive layer, then from the fifth thermally conductive layer to the sixth thermally conductive layer, and from the sixth thermally conductive layer to the first connecting member 30, where it is dissipated to the second row of cell modules 20b by the first connecting member 30. The addition of the sixth thermally conductive layer can improve the efficiency with which heat from the cells 21 is transferred to the first connecting member 30. Preferably, the sixth thermally conductive layer includes a thermally conductive adhesive.

[0094] In one embodiment, the second body 81 is provided with a second through-hole 81a, and the second through-hole 81a penetrates the second body 81. The flowing thermally conductive insulating material flows between the second insulating member 80 and the first connecting member 30 through the second through-hole 81a. In one embodiment, the sixth thermally conductive layer is formed by injecting an insulating material into the battery pack 100 and curing it. Preferably, the sixth thermally conductive layer includes at least one of a sealing material and a foaming material. Preferably, the sixth thermally conductive layer is formed by injecting a sealing material into the battery pack 100 and curing it. Preferably, the sixth thermally conductive layer is formed by foaming a foaming material. Preferably, the sixth thermally conductive layer includes a resin, and is formed by heating and melting the resin, and then providing a flowable resin to be injected between the second insulating member 80 and the first connecting member 30 and curing it. Preferably, the sixth thermally conductive layer is formed by using an injection molding process to provide and harden a fluid resin between the second insulating member 80 and the first connecting member 30. The sixth thermally conductive layer fills the gap between the second insulating member 80 and the first connecting member 30, strengthens the insulation protection between the second insulating member 80 and the first connecting member 30, and prevents foreign matter such as water or dust from entering between the second insulating member 80 and the first connecting member 30.

[0095] In one embodiment, the fourth, fifth, and sixth thermally conductive layers are formed by hardening the same material. First, a fast-curing, quick-drying insulating material, such as a quick-drying adhesive or foam, is injected into the eighth opening 811, the ninth opening 813, and the tenth opening 815. The fourth convex portion 812, the fifth convex portion 814, and the sixth convex portion 816 prevent the insulating material from flowing to other positions in the second body 81, and the hardened insulating material seals the eighth opening 811, the ninth opening 813, and the tenth opening 815. After the battery pack 100 is assembled as shown in FIG. 10 , it is turned upside down in the direction opposite to the third direction Z, and a flowable insulating material is injected through the injection passage. The insulating material flows between the cell casing 211 and the second relay plate 70, and can flow between the second insulating member 80 and the second relay plate 70 through the holes on the second relay plate 70. The second through-holes 81a allow the insulating material to flow between the second insulating member 80 and the first connecting member 30. The fluid insulating material between the second insulating member 80 and the first connecting member 30 hardens to form a sixth thermally conductive layer, the fluid insulating material between the second insulating member 80 and the second relay plate 70 hardens to form a fifth thermally conductive layer, and the fluid insulating material between the cell casing 211 and the second relay plate 70 hardens to form a fourth thermally conductive layer. Preferably, when the battery pack 100 is placed upside down, the gaps between the cells 21 can serve as injection passages. When the fluid insulating material is injected through the injection passage, the fourth thermal conductive layer, the fifth thermal conductive layer, and the sixth thermal conductive layer are made of the same insulating material, and the fourth thermal conductive layer, the fifth thermal conductive layer, and the sixth thermal conductive layer are formed by a single injection process, thereby improving productivity.

[0096] In one embodiment, along the third direction Z, there is an overlapping portion between the projection of the second through hole 81a and the projection of the electrode terminal 213, making it easier for the thermally conductive insulating material to flow from the second through hole 81a between the second insulating member 80 and the first connecting member 30.

[0097] In one embodiment, a second bump 81b is provided on one side of the second body 81 facing the second relay plate 70. When the second insulating member 80 is connected to the second relay plate 70, the second bump 81b can be in contact with and connected to the second relay plate 70, and a gap for accommodating the fifth thermally conductive layer is present between the second insulating member 80 and the second relay plate 70 due to the support of the second bump 81b. It can be understood that by adjusting the length of the second bump 81b in the third direction Z, the size of the gap between the second insulating member 80 and the second relay plate 70 can be adjusted, and further the thickness of the fifth thermally conductive layer between the second insulating member 80 and the second relay plate 70 can be adjusted.

[0098] 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 a thermally conductive adhesive and a thermally conductive mat.

[0099] 12 , 16 , 18 , 19 , and 20 , in one embodiment, the first connection member 30 includes a first portion 31 and a second portion 32, and the first portion 31 is connected to the second portion 32. A first passage 30a and a second connection hole 30b are provided in the first portion 31. The first passage 30a penetrates the first portion 31 along a first direction X. The first portion 31 includes a first surface 311 and a second surface 312 provided along a second direction Y. Along the second direction Y, a projection of the first surface 311 overlaps with a projection of the cell module 20a in the first row, and a projection of the second surface 312 overlaps with a projection of the cell module 20b in the second row. Heat is conducted from the cell module 20a in the first row via the first surface 311, and heat is conducted from the cell module 20b in the second row via the second surface 312, thereby dissipating heat. Preferably, along the first direction X, the projection of the cell module 20a in the first row is located within the projection of the first surface 311, and the projection of the cell module 20b in the second row is located within the projection of the second surface 312, so that each side of the cell module 20a in the first row can conduct heat with the first surface 311, and each side of the cell module 20b in the second row can conduct heat with the second surface 312, thereby further improving heat dissipation.

[0100] In one embodiment, a thermally conductive adhesive is provided between the first portion 31 and the first row of cell modules 20a, which allows heat to be rapidly conducted to the first connecting member 30, further improving heat dissipation. In one embodiment, a thermally conductive adhesive is provided between the first portion 31 and the second row of cell modules 20b, which allows heat to be rapidly conducted to the first connecting member 30, further improving heat dissipation.

[0101] In one embodiment, the first portion 31 further includes a second passage 30c, which penetrates the first portion 31 along the first direction X. The first passage 30a and the second passage 30c are spaced apart along the third direction Z. By providing the second passage 30c, both the first passage 30a and the second passage 30c can dissipate heat to the cells 21, further improving heat dissipation efficiency. The number of passages on the first portion 31 can be adjusted depending on the heat dissipation demand and the length of the first portion 31 along the third direction Z. It can be understood that the longer the length of the first portion 31, the greater the number of passages that can be installed. It can be understood that as the number of passages increases, the number of openings in the first case 11 and the second case 12 also needs to increase.

[0102] In one embodiment, the second portion 32 is disposed perpendicular to the first portion 31 and is disposed on the side of the first insulating member 60 that is away from the first relay plate 50. Along the third direction Z, the projection of the first conductive sheet 52 and the projection of the first through-hole 61a are both located within the projection of the second portion 32. Preferably, a third thermally conductive layer is disposed between the second portion 32 and the first body 61, so that heat from the first row of cell modules 20a is conducted to the second portion 32 via the third thermally conductive layer and from the second portion 32 to the first portion 31. The heat from the first portion 31 is then dissipated by the air flowing in the first passage 30a, thereby realizing heat dissipation for the first row of cell modules 20a.

[0103] In one embodiment, a first notch 321 is provided on the side of the second portion 32 that is connected to the first portion 31, and the first conductive member 24 is connected to the first conductive sheet 52 by the first notch 321.

[0104] In one embodiment, the first connection member 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 provided on a side of the second insulating member 80 away from the second relay 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. Preferably, a sixth thermally conductive layer is provided between the third portion 33 and the second body 81. Heat from the second row of cell modules 20b is conducted to the third portion 33 via the sixth thermally conductive layer and from the third portion 33 to the first portion 31. The heat from the first portion 31 is dissipated by the air flowing in the first passage 30a, thereby realizing heat dissipation to the second row of cell modules 20b.

[0105] In one embodiment, a second notch 331 is provided on the side of the third portion 33 that is connected to the first portion 31, and the first conductive member 24 is connected to the second conductive sheet 71 via the second notch 331. When the first conductive member 24 connects the first conductive sheet 52 and the second conductive sheet 71, a part of the first portion 31 is located within the second recess 241 when viewed along the first direction X.

[0106] In one embodiment, the first portion 31, the second portion 32 and the third portion 33 are of unitary construction.

[0107] 21 , the present application provides an electric device 200 using the battery pack 100. In one embodiment, the electric device 200 of the present application may be, but is not limited to, a drone, a backup power supply, an electric car, an electric motorcycle, an electric assist bicycle, a power tool, a large household battery, etc.

[0108] Those skilled in the art will understand that the above examples are merely for illustrating the present application and are not intended to limit the present application, and that any appropriate modifications and variations to the above examples within the substantial spirit of the present application are included within the scope of the disclosure of the present application. [Explanation of symbols]

[0109] 100 battery packs 10 Case Assembly 11 Case 1 11a 1st opening 11b 2nd opening 111 1st wall 112 First side wall 1121 First connection hole 113 Second side wall 114 Third Side Wall 115 4th side wall 12 Case 2 12a 1st hole 12b Fixed protrusion 12c First recess 121 Second wall 122 5th side wall 122a 3rd opening 123 6th Side Wall 123a 4th opening 124 7th Side Wall 125 8th Side Wall 13 Case 3 14 Support frame 15 Sealing material 151 Groove 15a 1st sealed part 15b 2nd sealed part 15c 3rd sealed part 20 Cell Assembly 20a First row cell module 20b Second row cell module 21 cells 21a 1st side 21b Second side 21c 3rd aspect 21d 4th side 21e 5th aspect 21f 6th side 211 Cell Case 211a Part 1 211b Part 2 2111 First Shell 2112 Second Shell 2113 1st extension part 2114 2nd extension part 2115 1st sealed part 2116 2nd sealed part 212 Electrode Assembly 213 Electrode terminal 213a Welded section 213b 1st terminal 213c 2nd terminal 22a First heat conductive member 22b Second heat conductive member 23 Elastic member 24 First conductive member 241 Second recess 30 First connecting member 30a 1st aisle 30b Second connection hole 30c 2nd aisle 31 Part 1 311 1st surface 312 2nd surface 32 Part 2 321 First notch 33 Part 3 331 Second notch 40 Circuit Board 50 First relay board 51 holes 511 1st communication hole 512 2nd communication hole 513 3rd communication hole 52 First conductive sheet 53 First electrical connection part 531 First conductive part 532 First Insulation Section 54 First sampling harness 60 First insulating member 61 First Body 61a 1st through hole 61b First Bump 611 5th Aperture 612 First convex part 613 6th Aperture 614 Second convex part 615 7th Aperture 616 Third convex part 101 First thermal conduction layer 102 Second thermal conduction layer 62 1st side plate 70 Second relay board 71 Second conductive sheet 72 Second electrical connection 721 Second conductive part 722 Second Insulation Section 73 Second sampling harness 80 Second insulating member 81 Second Body 81a Second through hole 81b 2nd Bump 811 8th Aperture 812 4th convex part 813 9th Aperture 814 5th convex part 815 10th Aperture 816 6th convex part 82 Second side plate X 1st direction Y Second direction Z 3rd direction

Claims

1. A battery pack comprising a case assembly, a first connection member, and a cell assembly, the case assembly has a first space, and the case assembly is provided with a first opening and a second opening communicating with the first space; the first connection member is accommodated in the first space, a first passage is provided in the first connection member, and the first opening and the second opening communicate with each other through the first passage; the cell assembly is at least partially provided in a first space, a projection of the first opening and a projection of the second opening are spaced apart from a projection of the cell assembly along a first direction, and the first direction is a stacking direction of cells in the cell assembly; A battery pack characterized by:

2. the case assembly includes a first case; the first case 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 the first space; the first opening is provided in the first side wall, the second opening is provided in the second side wall, the first side wall and the second side wall are arranged side by side in a first direction, the third side wall and the fourth side wall are arranged side by side in a second direction, and the first direction is perpendicular to the second direction; 2. The battery pack according to claim 1, wherein:

3. the first connecting member includes a first portion, the first passage is provided in the first portion, and the first portion is located between the third side wall and the fourth side wall along the second direction; 3. The battery pack according to claim 2, wherein:

4. the first connecting member includes a second portion connected to the first portion, and the cell assembly is positioned between the first wall and the second portion along a third direction, the third direction being perpendicular to both the first direction and the second direction; 4. The battery pack according to claim 3, wherein:

5. the cell assembly includes a first row of cell modules, the first row of cell modules including a plurality of cells stacked along the first direction; The cell includes a cell case, an electrode assembly provided in the cell case, and an electrode terminal connected to the electrode assembly and extending from the cell case. The battery pack according to any one of claims 2 to 4.

6. the cell assembly further includes a second row of cell modules, the first row of cell modules and the second row of cell modules being arranged side by side in the second direction, and the first portion being arranged between the first row of cell modules and the second row of cell modules along the second direction.

6. The battery pack according to claim 5, wherein:

7. the first connecting member further includes a third portion, the third portion being connected to the first portion, and along the third direction, the cell modules of the first row are positioned between the second portion and the first wall, and the cell modules of the second row are positioned between the third portion and the first wall.

7. The battery pack according to claim 6,

8. the battery pack further includes a first conductive member, the second portion having a first notch and the third portion having a second notch, one end of the first conductive member being connected to the cell module of the first row and the other end being connected to the cell module of the second row, a portion of the first conductive member being provided through the first notch, and a portion of the first conductive member being provided through the second notch; 8. The battery pack according to claim 7, wherein:

9. the battery pack further includes a first insulating member and a first relay plate, the first relay plate being connected to the electrode terminals, the first insulating member being provided on a side of the first relay plate that is away from the cell assembly, and a projection of the first relay plate and a projection of the first insulating member overlapping each other along the second direction, and a projection of the electrode terminals and a projection of the first insulating member overlapping each other along the second direction.

6. The battery pack according to claim 5, wherein:

10. a first thermally conductive layer is provided between the first relay plate and the cell case, and a projection of the electrode terminal and a projection of the first thermally conductive layer overlap each other along the first direction; 10. The battery pack according to claim 9.

11. a second thermally conductive layer is provided between the first insulating member and the first relay plate, and a projection of the electrode terminal and a projection of the second thermally conductive layer overlap each other along the first direction; The battery pack according to claim 10 .

12. 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 by pouring a flowing insulating material and hardening it. The battery pack according to claim 11 .

13. the second portion is located on a side of the first insulating member that is away from the first relay plate, and a third thermally conductive layer is provided between the second portion and the first insulating member.

10. The battery pack according to claim 9.

14. A battery pack according to any one of claims 1 to 13, An electrical device characterized by:

Images