Battery cell, battery pack and electric equipment

Abstract

The embodiment of the invention provides a battery cell, a battery pack and electric equipment. The battery cell comprises a shell, an electrode assembly, a pole and an output piece, the shell comprises a first wall and a second wall which are adjacently arranged. The electrode assembly is housed within the housing. The pole is installed on the first wall in an insulating mode and electrically connected with the electrode assembly. The output piece is located outside the shell and comprises a main body part and an output part, the main body part is arranged on the side, away from the electrode assembly, of the first wall in the thickness direction of the first wall and connected with the pole, the output part is connected to the end, in the thickness direction of the second wall, of the main body part, and the output part and the second wall are overlapped in the thickness direction of the second wall; the main body part is provided with a fusing part, the fusing part is located on an overcurrent path between the pole and the output part, and the thickness direction of the second wall is perpendicular to the thickness direction of the first wall. The current protection scheme is simple in structure and convenient to assemble.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles and portable electronic devices, lithium-ion batteries and other battery cells, as core energy storage units, are of paramount importance in terms of safety and reliability. When a battery cell experiences overload, short circuit, or other abnormal operating conditions, it can trigger a massive, instantaneous current surge within the cell, leading to thermal runaway, or even serious safety incidents such as fire or explosion. Therefore, equipping battery cells with fast and effective overcurrent protection devices is a critical aspect of battery system design.

[0003] The common overcurrent protection scheme for battery cells in related technologies mainly involves connecting an independent fuse in the external electrical circuit of the battery cell. However, the external fuse has a complex structure and is difficult to assemble. Summary of the Invention

[0004] The purpose of this application is to provide a battery cell, battery pack, and electrical equipment that enables a current protection scheme with a simple structure and convenient assembly.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, terminals, and an output component. The housing includes a first wall and a second wall disposed adjacent to each other. The electrode assembly is housed within the housing. The terminals are insulatedly mounted on the first wall and electrically connected to the electrode assembly. The output component is located outside the housing and includes a main body and an output portion. Along the thickness direction of the first wall, the main body is disposed on the side of the first wall opposite to the electrode assembly and connected to the terminals. The output portion is connected to one end of the main body along the thickness direction of the second wall, and the output portion overlaps with the second wall along the thickness direction of the second wall. The main body has a fusible portion located in the current path between the terminals and the output portion. The thickness direction of the second wall is perpendicular to the thickness direction of the first wall.

[0006] In the above technical solution, by setting the electrode post to be insulated and installed on the first wall and electrically connected to the electrode assembly, and the main body to be connected to the electrode post, the current is transferred from the electrode assembly to the outside, which is conducive to achieving high efficiency and controllability of the current transfer process and reducing resistance and energy loss in the current path. By setting the fuse part on the current path between the electrode post and the output part, the structure can be simplified and the assembly can be simplified.

[0007] In some embodiments, the first wall is provided with an explosion-proof valve, and the main body is provided with a first pressure relief hole at a position corresponding to the explosion-proof valve. The main body is provided with fusible portions on both sides of the first pressure relief hole along the first direction, and the first direction, the thickness direction of the second wall, and the thickness direction of the first wall are perpendicular to each other.

[0008] In the above technical solution, by setting the main body to form a fuse part on both sides of the first pressure relief hole along the first direction, and setting the explosion-proof valve corresponding to the first pressure relief hole, not only can the fuse part achieve overcurrent protection, but also can smoothly discharge gas when the battery cell experiences thermal runaway, which is beneficial to improve the integration and reliability of the battery cell in a limited space.

[0009] In some embodiments, along the thickness direction of the second wall, the second wall has a first outer surface facing away from the electrode assembly, and the first outer surface is provided with a first receiving groove, in which at least a portion of the output portion is received.

[0010] In the above technical solution, by setting at least a part of the output section to be accommodated in the first receiving groove, on the one hand, the connection between the output section and the second wall is stable, and on the other hand, the size of the battery cell along the thickness direction of the second wall can be reduced, which helps to reduce the risk of loosening of the connection point and improve space utilization.

[0011] In some embodiments, along the thickness direction of the second wall, the output portion has a second outer surface facing away from the electrode assembly, the second outer surface being flush with the first outer surface.

[0012] In the above technical solution, by setting the second outer surface to be flush with the first outer surface, on the one hand, the original external dimensions of the battery cell are maintained, so that the total dimension of the battery cell in the second wall thickness direction is almost unaffected by the increase of the output section, thus improving the space utilization rate; on the other hand, the flat second outer surface provides convenience for multiple battery cells to be arranged side by side, and to be simultaneously overlapped and welded (or screwed) to the output section of multiple battery cells through the busbar, thus simplifying the assembly process.

[0013] In some embodiments, the housing includes a third wall, which is disposed opposite to the second wall, and a first wall connects the second wall and the third wall. The output member includes a heat-conducting portion, which is disposed opposite to the output portion and is respectively connected to opposite ends of the main body portion along the thickness direction of the second wall. Along the thickness direction of the second wall, the heat-conducting portion overlaps with the third wall.

[0014] In the above technical solution, by setting the heat-conducting part and the output part opposite to each other and connecting them to opposite ends of the main body along the thickness direction of the second wall, and by overlapping the heat-conducting part with the third wall, the heat-conducting part and the output part are distributed at both ends of the main body, together forming a "U"-shaped structure bridging the two sides of the outer shell. This makes the connection with the outer shell (the second wall and the third wall) more stable and improves the resistance to vibration or impact. In addition, the heat-conducting part and the outer side of the third wall (e.g., a water-cooled plate attached to the third wall) can establish a direct and efficient heat conduction path.

[0015] In some embodiments, along the thickness direction of the second wall, the third wall has a third outer surface facing away from the electrode assembly, and the third outer surface is provided with a second receiving groove, in which at least a portion of the heat-conducting portion is received.

[0016] In the above technical solution, by setting at least a portion of the heat-conducting part to be accommodated in the second receiving groove, on the one hand, the connection between the heat-conducting part and the third wall is stable, and on the other hand, the size of the battery cell along the thickness direction of the second wall can be reduced, which helps to reduce the risk of loosening of the connection point and improves the space utilization rate.

[0017] In some embodiments, along the thickness direction of the second wall, the heat-conducting portion has a fourth outer surface opposite to the electrode assembly, the fourth outer surface being flush with the third outer surface.

[0018] In the above technical solution, by setting the fourth outer surface to be flush with the third outer surface, the size of the battery cell along the thickness direction of the second wall can be reduced, improving space utilization. Furthermore, the heat-conducting part is not recessed within the first receiving groove, facilitating electrical connection between the output sections of multiple battery cells.

[0019] In some embodiments, the battery cell includes a first insulating member, which includes a first portion, a second portion, and a third portion. The first portion connects the second portion and the third portion. The first portion is disposed between the main body portion and the first wall to insulate and isolate the main body portion and the first wall. The second portion is disposed between the output portion and the second wall to insulate and isolate the output portion and the second wall. The third portion is disposed between the heat-conducting portion and the third wall to insulate and isolate the heat-conducting portion and the third wall.

[0020] In the above technical solution, by setting the first part between the main body and the first wall to insulate and isolate the main body and the first wall, setting the second part between the output part and the second wall to insulate and isolate the output part and the second wall, and setting the third part between the heat-conducting part and the third wall to insulate and isolate the heat-conducting part and the third wall, the current is sequentially transmitted from the electrode assembly, the pole, and the main body to the output part, ensuring that the current flow path is unique and reducing the risk of fuse failure.

[0021] In some embodiments, the battery cell includes a first insulating member, which includes a first portion disposed between the main body and a first wall to insulate the main body and the first wall. Along the thickness direction of the first wall, a positioning portion protrudes from the surface of the first wall facing the main body. The first portion has a positioning hole, which is received within the positioning hole, and a gap exists between the positioning portion and the main body.

[0022] In the above technical solution, by setting a positioning part on the first wall to be accommodated in the positioning hole of the first part, the first insulating component is stably connected to the first wall, which helps to reduce misalignment during installation. Furthermore, a gap exists between the positioning part and the main body, allowing the first wall and the main body to be insulated from each other by air, ensuring a unique current flow path and reducing the risk of fuse failure.

[0023] In a second aspect, embodiments of this application provide a battery pack, which includes a busbar and a plurality of battery cells as described in the first aspect, wherein the busbar is used to connect the output sections of at least two battery cells.

[0024] In some embodiments, the housing includes a third wall disposed opposite to the second wall, and a first wall connecting the second and third walls. The output component includes a heat-conducting portion disposed opposite to the output portion and respectively connected to opposite ends of the main body portion along the thickness direction of the second wall; the heat-conducting portion overlaps with the third wall along the thickness direction of the second wall. The battery pack includes a water-cooling plate located on the side of the third wall away from the second wall along the thickness direction of the second wall and thermally connected to the heat-conducting portion.

[0025] In the above technical solution, by setting the water-cooled plate on the side of the third wall away from the second wall and connecting it to the heat-conducting part, the heat generated by the inside of the cell and the output components during operation can be actively and quickly carried away by the water-cooled plate through the heat transfer path constructed by the heat-conducting part and the third wall. This is conducive to the battery pack to achieve efficient and reliable thermal management, which can not only improve the thermal safety and working life of individual cells, but also enhance the thermal balance and operational reliability of the entire battery pack.

[0026] In a third aspect, embodiments of this application provide an electrical device, including a battery cell as described in the first aspect or a battery pack as described in the second aspect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application; Figure 2 Exploded views of a battery pack provided in some embodiments of this application; Figure 3 Top view of a battery pack provided in some embodiments of this application; Figure 4 Exploded views of the battery cell structure provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 6 for Figure 3 Sectional view of AA; Figure 7 for Figure 6 A partial view of the battery cell; Figure 8 A structural schematic diagram of the first wall (end cap) facing the electrode assembly, provided for some embodiments of this application; Figure 9 This is a schematic diagram of the structure of the output component provided in some embodiments of this application; Figure 10This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application; Figure 11 for Figure 6 A magnified view of the area at point W in the middle.

[0028] Explanation of reference numerals in the attached figures: 1-Battery cell; 11-Casing; 111-First wall; 1111-Explosion-proof valve; 1112-Positioning part; 1113-Lead-out hole; 1114-Second groove; 112-Second wall; 1121-First outer surface; 1122-First receiving groove; 113-Third wall; 1131-Third outer surface; 1132-Second receiving groove; 12-Electrode assembly; 13-Electrode post; 131-Protrusion post; 132-Plate body; 1311-Second through hole; 14-Output component; 141-Main body; 1411-Fuse part; 1412-First pressure relief hole; 1413-First through hole; 142-Output part; 1421-Second outer surface Surface; 143-Heat-conducting part; 1431-Fourth outer surface; 15-First insulating component; 151-First part; 1511-Positioning hole; 1512-Third through hole; 1513-Second pressure relief hole; 152-Second part; 153-Third part; 154-Fixing groove; 16-Second insulating component; 17-Sealing component; 18-End cap; 19-Housing shell; 2-Busbar; 3-Water cooling plate; 4-Heat-conducting pad; 31-Flow channel; 10-Battery pack; 101-Box body; 1011-Box body; 1012-Cover; 100-Electrical equipment; X-Thickness direction of the first wall; Y-Thickness direction of the second wall; Z-First direction. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an electrical device 100 provided in some embodiments of this application. Embodiments of this application provide an electrical device 100, which can be a mobile phone, laptop computer, electric vehicle, vehicle, etc. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery pack 10 is installed inside the vehicle, which can serve as the vehicle's power battery for power supply. The vehicle may also include a controller and a motor. The controller is used to control the power supply to the motor, for example, for the power needs of vehicle starting, navigation, and driving.

[0031] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the battery pack 10 provided in some embodiments of this application. Figure 3 This is a top view of a battery pack 10 provided in some embodiments of this application. The battery pack 10 includes a busbar 2 and battery cells 1, the busbar 2 being used to connect at least two battery cells 1. The battery pack 10 may include a housing 101 and battery cells 1, the battery cells 1 being housed within the housing 101. There may be one or more battery cells 1 within the housing 101. If there are multiple battery cells 1, the multiple battery cells 1 may be connected in series, in parallel, or in a mixed configuration, where a mixed configuration includes both series and parallel connections.

[0032] The box 101 may include a box body 1011 and a lid 1012, which are closed together. The box body 1011 and the lid 1012 may be of various shapes, such as cuboids, cylinders, etc.

[0033] As an example, there are multiple battery cells 1, and the battery pack 10 includes a busbar component for electrically connecting at least two battery cells 1. Taking multiple battery cells 1 connected in series as an example, the multiple battery cells 1 can be connected in series through multiple busbar components.

[0034] Please refer to Figure 2 and Figure 3 In some embodiments, the battery pack 10 may include a water-cooled plate 3, which is thermally connected to the battery cell 1 and is used to manage the temperature of the battery cell 1. The water-cooled plate 3 may be located at the bottom of the battery cell 1, or it may be located between the bottom wall of the housing 101 and the battery cell 1, or the bottom wall of the housing 101 may serve as the water-cooled plate 3.

[0035] Please refer to Figures 4 to 7 , Figure 4 This is an exploded view of the structure of cell 1 provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of cell 1 provided in some embodiments of this application. Figure 6 for Figure 3 Sectional view of AA, Figure 7 for Figure 6A partial view of a battery cell 1. This application provides a battery cell 1, which includes a housing 11, an electrode assembly 12, a terminal post 13, and an output component 14. The housing 11 includes a first wall 111 and a second wall 112 disposed adjacent to each other. The electrode assembly 12 is housed within the housing 11. The terminal post 13 is insulatedly mounted to the first wall 111 and electrically connected to the electrode assembly 12. The output component 14 is located outside the housing 11. The output component 14 includes a main body 141 and an output part 142. Along the thickness direction X of the first wall, the main body 141 is disposed on the side of the first wall 111 away from the electrode assembly 12 and is connected to the electrode post 13. The output part 142 is connected to one end of the main body 141 along the thickness direction of the second wall 112. Along the thickness direction of the second wall 112, the output part 142 overlaps with the second wall 112. The main body 141 has a fuse part 1411, which is located on the flow path between the electrode post 13 and the output part 142. The thickness direction Y of the second wall is perpendicular to the thickness direction X of the first wall.

[0036] The outer casing 11 serves to house the electrode assembly 12 and electrolyte, among other components. The outer casing 11 includes a housing 19 and end caps 18. The housing 19 has an opening, which can be one or more, corresponding one-to-one with the end caps 18. The housing can be cuboid in shape, and the housing 19 can be made of a metallic material, such as steel, aluminum, or aluminum alloy. The end caps 18 are components that close the openings of the housing to isolate the internal environment of the battery cell 1 from the external environment. The end caps 18 and the housing 19 together define a space for housing the electrode assembly 12, electrolyte, and other components. The end caps 18 can also be made of a metallic material, such as steel, aluminum, or aluminum alloy.

[0037] The first wall 111 and the second wall 112 can be walls within the housing 19, or one of the first wall 111 and the other of the second wall 112 can be an end cap and the other a wall within the housing 19. The outer casing 11 can have one or more first walls 111, and the first wall 111, the pole post 13, and the output component 14 correspond one-to-one. As an example, in... Figure 4 In the illustrated embodiment, the housing 19 has openings at opposite ends, and the housing 11 has two end caps 18, which respectively close the two openings. Both end caps 18 are first walls 111, and the second wall 111 is a wall in the housing 19 adjacent to the first wall 111. Both first walls 111 are provided with pole posts 13 and output components 14, and the pole posts 13 on the two first walls 111 have opposite polarities.

[0038] The electrode assembly 12 may include a positive electrode, a negative electrode, and a separator. The positive electrode, negative electrode, and separator may be stacked, making the electrode assembly 12 a stacked electrode assembly 12, or the positive electrode, negative electrode, and separator may be wound, making the electrode assembly 12 a wound electrode assembly 12.

[0039] The electrode post 13 is insulated and installed on the first wall 111. The electrode post 13 and the main body 141 can be connected in various ways, such as welding or riveting. For example, the first wall 111 is provided with a lead-out hole 1113. The electrode post 13 includes a plate 132 and a protrusion 131. The plate 132 is disposed on the side of the first wall 111 facing the electrode assembly 12. The protrusion 131 protrudes from the surface of the plate 132 facing the first wall 111. The protrusion 131 passes through the lead-out hole 1113 and is welded to the output part 142 of the output component 14. The battery cell 1 may include a second insulating member 16 and a sealing member 17. The second insulating member 16 is disposed between the plate 132 and the first wall 111, and the second insulating member 16 is provided with a through hole for the protrusion 131 to pass through. The sealing member 17 is disposed between the protrusion 131 and the first wall 111. The sealing member 17 is an annular structure surrounding the protrusion 131, and the sealing member 17 is at least partially located in the lead-out hole 1113. Both the second insulating member 16 and the sealing member 17 are made of insulating material.

[0040] The number of output components 14 corresponds to the number of openings in the housing 11. Both the output components 14 and the pole posts 13 are metal conductors. The main body 141 and the output parts 142 can be integrally formed or separately arranged and connected, such as by welding. For example, the main body 141 and the output parts 142 are both plate-shaped structures, perpendicular to each other, forming an "L" shape. The main body 141 is provided with a first through hole 1413, and the protrusion of the pole post 13 is provided with a second through hole 1311. The diameter of the first through hole 1413 is larger than the diameter of the second through hole 1311. The wall surface of the first through hole 1413 is welded to the protrusion to achieve the connection between the main body 141 and the pole post 13. The second through hole 1311 is used for identification by a vision inspection device in the welding equipment to accurately locate the welding position between the main body 141 and the protrusion 131. The vision inspection device can be a CCD camera.

[0041] Along the thickness direction of the second wall 112, the output portion 142 overlaps with the second wall 112; that is, in a plane perpendicular to the thickness direction of the second wall 112, the orthographic projection of the output portion 142 and the orthographic projection of the second wall 112 overlap. Along the thickness direction of the second wall 112, the output portion 142 may be stacked with the second wall 112, such that the entire output portion 142 is located on the side of the second wall 112 facing away from the electrode assembly 12, or at least a portion of the output portion 142 may be embedded within the second wall 112. The current path refers to the current path from the electrode assembly 12, the electrode post 13, the main body 141 to the output portion 142. During the current flow from the electrode post 13 to the output portion 142 along the current path, the current will pass through the fuse portion 1411. The fuse portion 1411 may be formed by reducing the cross-sectional area of ​​a local area of ​​the main body 141. The specific operation of reducing the cross-sectional area of ​​the main body 141 to form the fuse portion 1411 is, for example, by providing a through hole in the main body 141 or by providing a groove in the thickness direction of the main body 141.

[0042] In this design, by insulating the electrode post 13 to the first wall 111 and electrically connecting it to the electrode assembly 12, and connecting the main body 141 to the electrode post 13, current is transferred from the electrode assembly 12 to the outside, which facilitates the high efficiency and controllability of the current transfer process and reduces resistance and energy loss in the current path. By setting the fuse part 1411 on the current path between the electrode post 13 and the output part 142, the fuse part 1411 and the main body 141 of the output part 14 are designed as an integral unit, which not only simplifies the structure and assembly, but also improves space utilization and reduces the risk of loosening of the connection points.

[0043] Please refer to Figures 7 to 9 , Figure 8 This is a structural schematic diagram of the first wall 111 (end cap 18) facing the electrode assembly 12, provided for some embodiments of this application. Figure 9 This is a schematic diagram of the structure of the output component 14 provided in some embodiments of this application. In some embodiments, the first wall 111 is provided with an explosion-proof valve 1111, and the main body 141 is provided with a first pressure relief hole 1412 at a position corresponding to the explosion-proof valve 1111. The main body 141 forms a fusible portion 1411 on both sides of the first pressure relief hole 1412 along the first direction Z. The first direction Z, the thickness direction Y of the second wall, and the thickness direction X of the first wall are perpendicular to each other.

[0044] The explosion-proof valve 1111 and the first wall 111 can be either separate or integrated. In a separate design, the first wall 111 has a through hole, and the external explosion-proof valve 1111 is inserted into the through hole, with a groove along its thickness direction. In an integrated design, a second groove 1114 is provided on the first wall 111 along the thickness direction X of the first wall in the corresponding area of ​​the first pressure relief hole 1412, forming a weak area. When the internal pressure of the battery cell 1 exceeds the safety threshold, the weak area corresponding to the explosion-proof valve 1111 is ruptured, forming a pressure relief channel, and the gas generated during thermal runaway is discharged from the first pressure relief hole 1412, releasing the internal high-pressure gas and heat.

[0045] In this solution, by setting the main body 141 to form fuse parts 1411 on both sides of the first pressure relief hole 1412 along the first direction Z, and the explosion-proof valve 1111 is correspondingly set with the first pressure relief hole 1412, not only can the fuse part 1411 achieve overcurrent protection, but also can smoothly discharge gas when the battery cell 1 experiences thermal runaway, which is beneficial to improve the integration and reliability of the battery cell 1 in a limited space.

[0046] Please refer to Figure 7 In some embodiments, along the thickness direction Y of the second wall, the second wall 112 has a first outer surface 1121 facing away from the electrode assembly 12, and the first outer surface 1121 is provided with a first receiving groove 1122, in which at least a portion of the output portion 142 is received.

[0047] The output section 142 can be completely accommodated in the first receiving groove 1122, or it can be partially accommodated in the first receiving groove 1122, or its outer surface can be flush with the first receiving groove 1122.

[0048] In this solution, by setting at least a portion of the output section 142 to be accommodated in the first receiving groove 1122, the connection between the output section 142 and the second wall 112 is stabilized. On the other hand, the size of the battery cell 1 in the thickness direction Y of the second wall can be reduced, which helps to reduce the risk of loosening of the connection point and improves the space utilization rate.

[0049] Please refer to Figure 7 In some embodiments, along the thickness direction Y of the second wall, the output portion 142 has a second outer surface 1421 facing away from the electrode assembly 12, and the second outer surface 1421 is flush with the first outer surface 1121.

[0050] The second outer surface 1421 being flush with the first outer surface 1121 means that the plane on which the second outer surface 1421 is located and the plane on which the first outer surface 1121 is located are basically coincident in the thickness direction Y of the second wall, and there is no significant height difference between them that affects the overall outline of the cell 1 or hinders the planar electrical connection.

[0051] In this solution, by setting the second outer surface 1421 to be flush with the first outer surface 1121, on the one hand, the original external dimensions of the battery cell 1 are maintained, so that the total dimension of the battery cell 1 in the thickness direction of the second wall 112 is almost unaffected by the increase of the output section 142, thus improving the space utilization rate; on the other hand, the flat second outer surface 1421 provides convenience for multiple battery cells 1 to be arranged side by side, and to be simultaneously overlapped and welded (or screwed) to the output section 142 of multiple battery cells 1 by the busbar 2, thus simplifying the assembly process.

[0052] Please refer to Figure 7 In some embodiments, the outer casing 11 includes a third wall 113, which is disposed opposite to the second wall 112, and the first wall 111 connects the second wall 112 and the third wall 113. The output member 14 includes a heat-conducting part 143, which is disposed opposite to the output part 142 and is respectively connected to the two opposite ends of the main body 141 along the thickness direction Y of the second wall. Along the thickness direction Y of the second wall, the heat-conducting part 143 overlaps with the third wall 113.

[0053] The overlap between the heat-conducting part 143 and the third wall 113 as a planar projection does not necessarily mean that they are in direct contact. The heat-conducting part 143 and the third wall 113 can be in direct contact (such as surface contact), or they can be separated by insulating parts, thermal pads 4, etc. The first wall 111 can be connected to the second wall 112 and the third wall 113 by snap-fit, screw connection, or welding, etc.

[0054] In this design, the heat-conducting part 143 and the output part 142 are positioned opposite each other and connected to opposite ends of the main body 141 along the thickness direction Y of the second wall. The heat-conducting part 143 overlaps with the third wall 113, allowing the heat-conducting part 143 and the output part 142 to be distributed at both ends of the main body 141, together forming a "U"-shaped structure bridging both sides of the outer shell 11. This results in a more stable connection with the outer shell 11 (the second wall 112 and the third wall 113), improving resistance to vibration or impact. Furthermore, a direct and efficient heat conduction path can be established between the heat-conducting part 143 and the outer side of the third wall 113 (e.g., a water-cooled plate 3 attached to the third wall 113).

[0055] Please refer to Figure 7 In some embodiments, along the thickness direction Y of the second wall, the third wall 113 has a third outer surface 1131 facing away from the electrode assembly 12, and the third outer surface 1131 is provided with a second receiving groove 1132, in which at least a portion of the heat-conducting part 143 is received.

[0056] The heat-conducting part 143 can be completely contained in the second receiving groove 1132, or it can be partially contained in the second receiving groove 1132, or its outer surface can be flush with the second receiving groove 1132.

[0057] In this solution, by setting at least a portion of the heat-conducting part 143 to be accommodated in the second receiving groove 1132, on the one hand, the heat-conducting part 143 is stably connected to the third wall 113, and on the other hand, the size of the battery cell 1 in the thickness direction Y of the second wall can be reduced, which helps to reduce the risk of loosening of the connection point and improves the space utilization.

[0058] Please refer to Figures 9 to 11 , Figure 10 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application. Figure 11 for Figure 6 A partial enlarged view of the area at point W. In some embodiments, along the thickness direction Y of the second wall, the heat-conducting portion 143 has a fourth outer surface 1431 facing away from the electrode assembly 12, and the fourth outer surface 1431 is flush with the third outer surface 1131.

[0059] The fact that the fourth outer surface 1431 is flush with the third outer surface 1131 means that the plane on which the fourth outer surface 1431 is located and the plane on which the third outer surface 1131 is located are basically coincident in the thickness direction Y of the second wall, and there is no significant height difference between them that affects the overall outline of the cell 1 or hinders the planar electrical connection.

[0060] In this design, by making the fourth outer surface 1431 flush with the third outer surface 1131, the size of the battery cell 1 along the thickness direction Y of the second wall can be reduced, thus improving space utilization. Furthermore, the heat-conducting part 143 is not recessed within the first receiving groove 1122, facilitating electrical connection between the output parts 142 of multiple battery cells 1.

[0061] Please refer to Figure 10 and Figure 11 In some embodiments, the battery cell 1 includes a first insulating member 15, which includes a first portion 151 disposed between the main body portion 141 and the first wall 111 to insulate and isolate the main body portion 141 and the first wall 111. Along the thickness direction X of the first wall, a positioning portion 1112 is provided on the surface of the first wall 111 facing the main body portion 141. The first portion 151 is provided with a positioning hole 1511, and the positioning portion 1112 is accommodated in the positioning hole 1511. There is a gap between the positioning portion 1112 and the main body portion 141.

[0062] The first insulating component 15 is provided with a second pressure relief hole 1513 that communicates with the first pressure relief hole 1412 at the position corresponding to the explosion-proof valve 1111.

[0063] The gap between the positioning part 1112 and the main body part 141 means that the positioning part 1112 and the main body part 141 are insulated by air.

[0064] The output component 14 is provided with welding holes, through which the positioning part 1112 is welded to the positioning hole 1511.

[0065] The material of the first insulating component 15 can be plastic, rubber, etc.

[0066] In this design, by setting the positioning part 1112 on the first wall 111 to be accommodated within the positioning hole 1511 of the first part 151, the first insulating member 15 is stably connected to the first wall 111, which helps to reduce misalignment during installation. A gap exists between the positioning part 1112 and the main body 141, allowing the first wall 111 and the main body 141 to be insulated from each other by air, ensuring a unique current flow path and reducing the risk of failure of the fuse part 1411.

[0067] Please refer to Figure 11 In some embodiments, the battery pack 10 includes a water-cooled plate 3 along the thickness direction Y of the second wall. The water-cooled plate 3 is located on the side of the third wall 113 opposite to the second wall 112 and is thermally connected to the heat-conducting part 143.

[0068] The battery cell 1 includes a thermal pad 4, which is located between the third wall 113 and the water-cooling plate 3. A flow channel 31 is formed between the water-cooling plate 3 and the third wall 113 to accommodate coolant.

[0069] Bus 2 connects to the output section 142 of at least two battery cells 1.

[0070] During charging and discharging, the heat of the battery cell 1 is conducted through the electrode assembly 12 to the electrode post 13, the electrode post 13 to the first wall 111, the first wall 111 to the thermal pad 4, the thermal pad 4 to the water cooling plate 3, and finally the flow channel 31 of the water cooling plate 3 carries away the heat through the coolant.

[0071] In this scheme, by setting the water-cooled plate 3 on the side of the third wall 113 away from the second wall 112 and thermally connecting it with the heat-conducting part 143, the heat generated by the inside of the battery cell 1 and the output component 14 during operation can be actively and quickly carried away by the water-cooled plate 3 through the heat transfer path constructed by the heat-conducting part 143 and the third wall 113. This is beneficial for the battery pack 10 to achieve efficient and reliable thermal management, which can not only improve the thermal safety and working life of the individual battery cell 1, but also enhance the thermal balance and operational reliability of the entire battery pack 10.

[0072] Please refer to Figure 10 and Figure 11In some embodiments, the battery cell 1 includes a first insulating member 15, which includes a first portion 151, a second portion 152, and a third portion 153. The first portion 151 connects the second portion 152 and the third portion 153. The first portion 151 is disposed between the main body portion 141 and the first wall 111 to insulate and isolate the main body portion 141 and the first wall 111. The second portion 152 is disposed between the output portion 142 and the second wall 112 to insulate and isolate the output portion 142 and the second wall 112. The third portion 153 is disposed between the heat-conducting portion 143 and the third wall 113 to insulate and isolate the heat-conducting portion 143 and the third wall 113.

[0073] The material of the first insulating component 15 can be plastic, rubber, etc. The first part 151, the second part 152, and the third part 153 can be integrally formed or welded together.

[0074] The first insulating member 15 has a fixing groove 154 on its side facing the output member 14 for accommodating the output member 14. The first insulating member 15 has a third through hole 1512 along its thickness direction for the first protrusion 131 to extend out.

[0075] In this solution, by setting a first part 151 between the main body 141 and the first wall 111 to insulate and isolate the main body 141 and the first wall 111, setting a second part 152 between the output part 142 and the second wall 112 to insulate and isolate the output part 142 and the second wall 112, and setting a third part 153 between the heat-conducting part 143 and the third wall 113 to insulate and isolate the heat-conducting part 143 and the third wall 113, the current is sequentially transferred from the electrode assembly 12, the electrode post 13, and the main body 141 to the output part 142, ensuring that the current flow path is unique and reducing the risk of failure of the fuse part 1411.

[0076] In this application, "multiple" refers to two or more.

[0077] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0079] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0080] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing (11) includes a first wall (111) and a second wall (112) disposed adjacent to each other. Electrode assembly (12) is housed within the housing (11); The electrode post (13) is insulated and installed on the first wall (111) and electrically connected to the electrode assembly (12); The output component (14) is located outside the housing (11). The output component (14) includes a main body (141) and an output part (142). Along the thickness direction (X) of the first wall, the main body (141) is disposed on the side of the first wall (111) away from the electrode assembly (12) and is connected to the pole post (13). The output part (142) is connected to one end of the main body (141) along the thickness direction (Y) of the second wall. Along the thickness direction (Y) of the second wall, the output part (142) overlaps with the second wall (112). The main body (141) has a fuse part (1411). The fuse part (1411) is located on the flow path between the pole post (13) and the output part (142). The thickness direction (Y) of the second wall is perpendicular to the thickness direction (X) of the first wall.

2. The battery cell according to claim 1, characterized in that, The first wall (111) is provided with an explosion-proof valve (1111), and the main body (141) is provided with a first pressure relief hole (1412) at a position corresponding to the explosion-proof valve (1111). The main body (141) forms the fuse portion (1411) on both sides of the first pressure relief hole (1412) along the first direction (Z). The first direction (Z), the thickness direction (Y) of the second wall and the thickness direction (X) of the first wall are perpendicular to each other.

3. The battery cell according to claim 1, characterized in that, Along the thickness direction (Y) of the second wall, the second wall (112) has a first outer surface (1121) facing away from the electrode assembly (12), and the first outer surface (1121) is provided with a first receiving groove (1122), and at least a portion of the output part (142) is received in the first receiving groove (1122).

4. The battery cell according to claim 3, characterized in that, Along the thickness direction (Y) of the second wall, the output portion (142) has a second outer surface (1421) facing away from the electrode assembly (12), and the second outer surface (1421) is flush with the first outer surface (1121).

5. The battery cell according to any one of claims 1-4, characterized in that, The outer casing (11) includes a third wall (113) which is disposed opposite to the second wall (112), and the first wall (111) connects the second wall (112) and the third wall (113). The output component (14) includes a heat-conducting part (143), which is disposed opposite to the output part (142) and is respectively connected to the two opposite ends of the main body part (141) along the thickness direction (Y) of the second wall. Along the thickness direction (Y) of the second wall, the heat-conducting part (143) overlaps with the third wall (113).

6. The battery cell according to claim 5, characterized in that, Along the thickness direction (Y) of the second wall, the third wall (113) has a third outer surface (1131) facing away from the electrode assembly (12), and the third outer surface (1131) is provided with a second receiving groove (1132), and at least a portion of the heat-conducting part (143) is received in the second receiving groove (1132).

7. The battery cell according to claim 6, characterized in that, Along the thickness direction (Y) of the second wall, the heat-conducting part (143) has a fourth outer surface (1431) facing away from the electrode assembly (12), and the fourth outer surface (1431) is flush with the third outer surface (1131).

8. The battery cell according to claim 5, characterized in that, The battery cell includes a first insulating member (15), which includes a first part (151), a second part (152), and a third part (153). The first part (151) connects the second part (152) and the third part (153). The first part (151) is disposed between the main body (141) and the first wall (111) to insulate the main body (141) and the first wall (111). The second part (152) is disposed between the output part (142) and the second wall (112) to insulate the output part (142) and the second wall (112). The third part (153) is disposed between the heat-conducting part (143) and the third wall (113) to insulate the heat-conducting part (143) and the third wall (113).

9. The battery cell according to any one of claims 1-4, characterized in that, The battery cell includes a first insulating member (15), the first insulating member (15) includes a first portion (151), the first portion (151) is disposed between the main body (141) and the first wall (111) to insulate and isolate the main body (141) and the first wall (111). Along the thickness direction (X) of the first wall, a positioning part (1112) is provided on the surface of the first wall (111) facing the main body (141), and a positioning hole (1511) is provided in the first part (151). The positioning part (1112) is accommodated in the positioning hole (1511), and there is a gap between the positioning part (1112) and the main body (141).

10. A battery pack, characterized in that, It includes a bus (2) and a plurality of battery cells as described in any one of claims 1-9, wherein the bus (2) is used to connect the output section (142) of at least two of the battery cells.

11. The battery pack according to claim 10, characterized in that, The battery cell is the battery cell according to claim 5, and the battery pack includes a water cooling plate (3) along the thickness direction (Y) of the second wall. The water cooling plate (3) is located on the side of the third wall (113) away from the second wall (112) and is thermally connected to the heat-conducting part (143).

12. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-9 or the battery pack as described in claim 10 or 11.

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