Top cover assembly, battery monomer, battery and electric device
By designing a metal layer and a high-strength insulating layer on the top cover of the battery cell, combined with through holes and raised structures, the problems of battery cell strength and space utilization are solved, achieving higher space utilization and safety performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
- Filing Date
- 2026-01-08
- Publication Date
- 2026-05-08
AI Technical Summary
Existing battery cell top cover assemblies cannot simultaneously achieve good strength and space utilization, resulting in low internal space utilization and insufficient safety performance of battery cells.
The top cover plate design includes a metal layer and an insulating layer. The mechanical strength of the second insulating component is greater than that of the first insulating component. The insulating layer has through holes and raised structures to enhance connection reliability and heat resistance, and abuts against the electrode assembly to prevent displacement and short circuit.
It improves the internal space utilization and structural strength of battery cells, enhances the safety performance of battery cells, and prevents electrode assembly displacement and internal short circuits.
Smart Images
Figure CN122000567A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, and in particular to a top cover assembly, a battery cell, a battery, and an electrical device. Background Technology
[0002] In the field of battery technology, continuously improving the energy density and space utilization of individual battery cells is one of the core development goals. In related technologies, the top cover assembly of a battery cell typically includes a top cover sheet and a lower plastic layer. The lower plastic layer is usually fixed below the top cover sheet by heat fusion and is used to insulate the top cover sheet and electrode assembly.
[0003] However, due to the relatively low strength of the lower plastic, the thickness of the top cover sheet is usually increased to ensure sufficient strength of the entire top cover assembly. Simultaneously, to prevent insulation failure in the lower plastic, its thickness is often designed to be relatively large. This setup results in a thicker overall top cover assembly, occupying a significant portion of the internal height space of the battery cell, thus affecting the space utilization rate within the battery cell. If the thickness of the top cover assembly is reduced to improve the space utilization rate in the height direction of the battery cell, the limited strength of the lower plastic means that only the thickness of the top cover sheet can be reduced, leading to poor overall strength of the top cover assembly. Furthermore, due to the relatively low strength and heat resistance of the lower plastic, it is prone to deformation or melting when the internal temperature of the battery cell rises sharply, causing internal short circuits and affecting the safety performance of the battery cell. Summary of the Invention
[0004] The purpose of this application is to provide a top cover assembly, a battery cell, a battery, and an electrical device to solve the technical problem that the top cover assembly in the prior art cannot simultaneously achieve good strength and space utilization.
[0005] In a first aspect, this application provides a top cover assembly, including: a top cover plate, which includes a metal layer and an insulating layer along its thickness direction. The insulating layer includes a first insulating member and a second insulating member, wherein the mechanical strength of the second insulating member is greater than that of the first insulating member. The second insulating member includes an insulating body and a second protrusion. The insulating body has at least one first through hole penetrating its thickness direction. At least a portion of the first insulating member is disposed in the first through hole. The second protrusion is disposed at both ends of the insulating body along its length direction and protrudes from the insulating body in a direction away from the metal layer.
[0006] In one or more embodiments of this application, an insulating body and at least a portion of a first insulating element are stacked along the thickness direction of the top cover plate.
[0007] In one or more embodiments of this application, the surface of the first insulating member facing the insulating body is provided with at least one first protrusion. The first protrusion is located within the first through hole. Along the thickness direction of the top cover plate, the surface of the first protrusion and the surface of the insulating body facing away from the first insulating member are on the same plane. The side of the first insulating member facing the metal layer is connected to the metal layer.
[0008] In one or more embodiments of this application, the first insulating member is embedded within the second insulating member along the thickness direction of the top cover plate.
[0009] In one or more embodiments of this application, the first insulating member is embedded in the first through hole of the second insulating member, and the surface of the first insulating member facing the metal layer is flush with the surface of the second insulating member facing the metal layer, and the surface of the first insulating member away from the metal layer is flush with the surface of the insulating body away from the metal layer.
[0010] In one or more embodiments of this application, the metal layer, the first insulating element, and the second insulating element are an integral structure.
[0011] In one or more embodiments of this application, the metal layer has a first nanopore on the surface in contact with the first insulating member, and at least a portion of the first insulating member is embedded in the first nanopore and connected to the metal layer; and / or, The second insulating member has a second nanopore on its surface in contact with the first insulating member, and at least a portion of the first insulating member is embedded in the second nanopore and connected to the second insulating member.
[0012] In one or more embodiments of this application, the connection area between the first insulating element and the metal layer is S4, satisfying: 300mm² 2 ≤S4≤15000mm 2 ; and / or, On a virtual plane perpendicular to the thickness direction of the top cover plate, the area of the orthographic projection region of the outer contour of the metal layer is S5, satisfying: 1300mm². 2 ≤S5≤20000mm 2 ; and / or, Satisfying: 20% ≤ S4 / S5 ≤ 75%; and / or, Along the thickness direction of the top cover plate, the thickness of the metal layer is 'a', satisfying: 0.1mm ≤ a ≤ 1.5mm; and / or, Along the thickness direction of the top cover plate, the thickness of the metal layer is a, and the total thickness of the top cover plate is b, satisfying: 5%≤a / b≤60%.
[0013] In one or more embodiments of this application, along the thickness direction of the top cover plate, the minimum distance between the surface of the second protrusion away from the insulating body and the surface of the insulating body is h, satisfying: 2mm ≤ h ≤ 8mm; and / or, Along the length of the top cover plate, the maximum width of the second protrusion is L1, satisfying: 3mm ≤ L1 ≤ 20mm; and / or, Along the length of the top cover plate, the maximum width of the second protrusion is L1, and along the width of the top cover plate, the width of the metal layer is L2, satisfying: 5%≤L1 / L2≤50%.
[0014] In one or more embodiments of this application, the first through hole is elongated and / or arc-shaped; and / or, The first through-hole is arranged on the insulating body along its length and / or along its width; and / or, The total area of the first through hole is S1. On a hypothetical plane perpendicular to the thickness direction of the top cover plate, the area of the orthographic projection region of the outer contour of the second insulating component is S2, satisfying: 10% ≤ S1 / S2 ≤ 70%; and / or, The metal layer is provided with a first liquid injection hole, and the insulating body is provided with a second liquid injection hole corresponding to the first liquid injection hole; and / or, The metal layer is equipped with a pressure relief mechanism, and the insulating body is equipped with an exhaust port corresponding to the pressure relief mechanism.
[0015] Secondly, this application provides a battery cell including the top cover assembly described in any of the first aspects.
[0016] Thirdly, this application provides a battery cell, comprising: a housing, at least one electrode assembly, and a top cover assembly as described in any of the first aspects, wherein the housing has an opening; at least one electrode assembly is housed within the housing, the electrode assembly having a corner portion; and a second protrusion of the top cover assembly abuts against the corner portion of the electrode assembly.
[0017] Fourthly, this application provides a battery, including the battery cell described in the second or third aspect.
[0018] Fifthly, this application provides an electrical device comprising a battery cell as described in the second or third aspect, or a battery as described in the fourth aspect.
[0019] Based on the above technical solution, the top cover assembly, battery cell, battery, and power device of this application have at least the following beneficial technical effects: In the top cover assembly provided in this application embodiment, the top cover plate includes a metal layer and an insulating layer along its thickness direction. The insulating layer includes a first insulating member and a second insulating member, wherein the mechanical strength of the second insulating member is greater than that of the first insulating member. This allows the second insulating member to compensate for the overall strength of the top cover plate, thereby allowing for a reduction in the thickness of the metal layer. This not only reduces the total thickness of the top cover plate and improves the space utilization rate of the battery cell's internal height, but also enables the top cover assembly to achieve high space utilization while possessing good structural strength. Because the overall strength of the top cover plate is improved, it is less prone to deformation during use, enhancing the safety performance of the battery cell. The second insulating member includes an insulating body and a second protrusion. The insulating body has at least one first through hole penetrating its thickness direction, and at least a portion of the first insulating member is disposed in the first through hole, thereby enhancing the bonding force between the first and second insulating members, improving the connection reliability of the top cover plate, and enabling the top cover plate to form an integral structure. The second protrusion is disposed at both ends of the insulating body along its length direction, and the second protrusion protrudes from the insulating body in a direction away from the metal layer. Furthermore, the second protrusion can abut against the electrode assembly, preventing the electrode assembly from shifting. At the same time, since the mechanical strength of the second insulating component is greater than that of the first insulating component, and the heat resistance of the second insulating component is also better, even when the internal temperature of the battery cell rises sharply, the second protrusion is not prone to deformation or melting, thus avoiding the occurrence of internal short circuits and thermal runaway in the battery cell and improving the safety performance of the battery cell. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is an exploded disassembly diagram of the top cover plate in the top cover assembly provided in this application embodiment.
[0022] Figure 2 This is a schematic diagram of the explosive decomposition of the insulating layer in the top cover plate of the top cover assembly provided in this application embodiment.
[0023] Figure 3 This is a top view of the top cover plate in the top cover assembly provided in this application embodiment.
[0024] Figure 4 yes Figure 3 AA section view.
[0025] Figure 5 yes Figure 4 Enlarged view of point A in the image.
[0026] Figure 6 This is a bottom view of the top cover plate in the top cover assembly provided in this application embodiment.
[0027] Figure 7 This is an exploded disassembly diagram of the top cover plate in a top cover assembly provided in another embodiment of this application.
[0028] Figure 8 This is a schematic diagram of the explosive decomposition of the insulating layer in the top cover plate of the top cover assembly provided in another embodiment of this application.
[0029] Figure 9 This is a top view of the top cover plate in another embodiment of the top cover assembly provided in this application.
[0030] Figure 10 yes Figure 9 AA section view.
[0031] Figure 11 This is a three-dimensional structural diagram of a battery cell provided in an embodiment of this application.
[0032] Figure 12 This is a cross-sectional view of a battery cell provided in an embodiment of this application.
[0033] Figure 13 This is a schematic diagram of the explosive decomposition of a single battery cell provided in an embodiment of this application.
[0034] Figure 14 This is an exploded view of the battery provided in an embodiment of this application.
[0035] Figure 15 This is a schematic diagram of the structure of the electrical device provided in the embodiments of this application.
[0036] In the diagram: 1000 - Vehicle; 1100 - Battery; 1101 - Housing; 1 - Battery cell; 2 - First housing section; 3 - Second housing section; 10 - Top cover; 20 - Electrode assembly; 21 - Corner section; 22 - Straight section; 30 - Housing; 40 - Insulating film; 50 - Adapter; 201 - Positive electrode tab; 202 - Negative electrode tab; 11 - Metal layer; 12 - Insulating layer; 13 - Terminal post; 14 - Third insulating component; 15 - Protective film ; 111-Second through hole; 112-First injection hole; 113-Pressure relief mechanism; 120-First protrusion; 121-First insulating component; 122-Second insulating component; 123-Second protrusion; 124-Third through hole; 125-First through hole; 126-Second injection hole; 127-Vent hole; 129-Insulating body; 131-First connecting part; 132-Second connecting part; 141-First insulating part; 142-Second insulating part. Detailed Implementation
[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0041] In related technologies, the top cover assembly of a battery cell typically includes a top cover sheet and a lower plastic layer. The lower plastic layer is usually fixed below the top cover sheet by heat fusion and is used to insulate the top cover sheet and electrode components. However, due to the relatively low strength of the lower plastic layer, the thickness of the top cover sheet is usually increased to ensure sufficient strength of the entire top cover assembly. Simultaneously, to prevent insulation failure, the lower plastic layer is often designed to be quite thick. This configuration results in a relatively thick overall top cover assembly, occupying a significant portion of the internal height space of the battery cell, thus affecting the space utilization rate within the battery cell. If the thickness of the top cover assembly is reduced to improve the space utilization rate in the height direction of the battery cell, the limited strength of the lower plastic layer necessitates only reducing the thickness of the top cover sheet, leading to poor overall strength of the top cover assembly. Furthermore, due to the relatively low strength and heat resistance of the lower plastic layer, it is prone to deformation or melting when the internal temperature of the battery cell rises sharply, causing internal short circuits and affecting the safety performance of the battery cell.
[0042] Based on the above considerations, in order to solve the technical problem that the top cover assembly in the prior art cannot simultaneously achieve good strength and space utilization, this application provides an electrical device, a battery, a battery cell, and a top cover assembly.
[0043] The electrical devices disclosed in this application can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators and lifting equipment, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc.
[0044] This application describes an electrical device using a vehicle 1000 as an example. Figure 15 As shown, vehicle 1000 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 1100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. Battery 1100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller and a motor. The controller is used to control the battery to power the motor, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving. The battery can not only serve as the operating power source for vehicle 1000 but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.
[0045] As one embodiment of battery 1100, such as Figure 14As shown, the battery 1100 includes a housing 1101 and a battery cell 1, with the battery cell 1 housed within the housing 1101. The housing 1101 provides a space for the battery cell 1 and can have various structures. In some embodiments, the housing 1101 may include a first housing portion 2 and a second housing portion 3, which overlap each other, together defining a space for accommodating the battery cell 1. The second housing portion 3 may be a hollow structure with one open end, and the first housing portion 2 may be a plate-like structure, with the first housing portion 2 covering the open side of the second housing portion 3 so that the first housing portion 2 and the second housing portion 3 together define the space. Alternatively, both the first housing portion 2 and the second housing portion 3 may be hollow structures with one open side, with the open side of the first housing portion 2 covering the open side of the second housing portion 3. Of course, the box 1101 formed by the first box part 2 and the second box part 3 can be of various shapes, such as a cylinder, a cuboid, etc.
[0046] The aforementioned battery 1100 can be a battery pack or a battery module. When the battery 1100 is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells 1. The multiple battery cells 1 can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system, which controls and monitors the operating status of each battery cell 1. Alternatively, the multiple battery cells 1 can first be combined with a module management system to form a battery module, and then the multiple battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.
[0047] Multiple battery cells 1 can be mounted on supporting structures such as housings, frames, and brackets. The individual battery cells 1 and the battery management system can be electrically connected via electrical connectors, which can be busbars. Alternatively, the individual battery cells can be electrically connected via their respective terminals. For example, between two adjacent battery cells, one battery cell has a slot on its terminal, and the other battery cell has a corresponding insert on its terminal. The insert is inserted into the slot to achieve electrical connection. Therefore, for one battery cell, the aforementioned electrical connector can be the terminal of another battery cell. Similarly, the battery cells and the battery management system can also be electrically connected via mutual insertion, which will not be elaborated further here.
[0048] The aforementioned battery cell 1 can be a secondary battery or a primary battery, and can also be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery. Its external outline can be cylindrical, flat, cuboid, or other shapes, but is not limited to these. Specifically, in this embodiment, the aforementioned battery cell is a lithium-ion square battery.
[0049] As one embodiment of battery cell 1, battery cell 1 refers to the smallest unit that makes up the battery. Please refer to... Figure 11 and Figure 13 The battery cell 1 includes a housing 30, an electrode assembly 20, a top cover assembly, and other functional components. At least one end of the housing 30 has an opening, and the top cover assembly covers the opening of the housing 30 to isolate the internal environment of the battery cell from the external environment. The housing 30 has an internal cavity to accommodate the electrode assembly 20. The housing 30 is a component used to cooperate with the top cover assembly to form the internal environment of the battery cell, wherein the formed internal environment can accommodate the electrode assembly 20, electrolyte, and other components. The housing 30 and the top cover assembly can be independent components. An opening can be provided on the housing 30, and the top cover assembly closes the opening to form the internal environment of the battery cell. The housing 30 can have various shapes and sizes, such as cylindrical, cuboid, hexagonal prism, etc. Specifically, the shape of the housing 30 can be determined according to the specific shape and size of the electrode assembly 20. The material of the housing 30 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.
[0050] As one embodiment of the electrode assembly 20, the electrode assembly 20 is a component in the battery cell that undergoes an electrochemical reaction with the electrolyte. The housing 30 may contain one or more electrode assemblies 20. The electrode assembly 20 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode sheets. The separator, disposed between the positive and negative electrode sheets, can reduce short circuits between the positive and negative electrodes while allowing active ions to pass through. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected. The positive electrode sheet may include a positive current collector and positive active material layers coated on opposite sides of the positive current collector. The negative electrode sheet may include a negative current collector and negative active material layers coated on opposite sides of the negative current collector. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body. The main body of the electrode assembly 20 includes a straight portion 22 and a corner portion 21; understandably, the corner portion 21 is located at both ends of the straight portion 22 along its length. The electrode assembly 20 is covered with an insulating film 40 to reduce the risk of short circuits.
[0051] In some embodiments, each electrode assembly 20 extends a positive electrode tab 201 and a negative electrode tab 202 from its end face toward the top cover assembly. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the positive electrode tab 201 and negative electrode tab 202 are respectively connected to the terminal post 13 to form a current loop. Before the electrode assembly 20 is installed into the housing 30, the positive electrode tab 201 and negative electrode tab 202 of the electrode assembly 20 are first assembled with the top cover assembly, for example, by welding the terminal post 13 of the top cover assembly to the tab of the electrode assembly 20 through the adapter 50, and then the electrode assembly 20 is installed into the housing 30.
[0052] As one embodiment of the top cover assembly, please refer to Figure 1 , Figure 2 or Figure 7 , Figure 8 The top cover assembly includes a top cover plate 10, the shape of which is adapted to the shape of the housing 30 to accommodate the opening of the housing 30. Along its thickness direction, the top cover plate 10 includes a metal layer 11 and an insulating layer 12. The metal layer 11 can be made of a metal material with a certain hardness and strength, such as copper, iron, aluminum, stainless steel, or aluminum alloy. Figure 2 or Figure 8 As shown, the insulating layer 12 includes a first insulating element 121 and a second insulating element 122. The mechanical strength of the second insulating element 122 is greater than that of the first insulating element 121. This means that under a certain force, the elastic deformation of the second insulating element 122 is smaller than that of the first insulating element 121, i.e., the rigidity of the second insulating element 122 is better than that of the first insulating element 121. The first insulating element 121 can be made of plastic materials such as PP, PE, or PPS. The second insulating element 122 can be made of a material with mechanical strength close to or even greater than that of the metal layer 11 and greater than that of the first insulating element 121, such as ceramic. Ceramic has high heat dissipation performance; when the first insulating element 121 and the second insulating element 122 are connected, the second insulating element 122 can also quickly dissipate the heat from the first insulating element 121, improving the heat dissipation capacity of the top cover plate 10. Meanwhile, the second insulating element 122 can compensate for the overall strength of the top cover plate 10, thereby allowing for a reduction in the thickness of the metal layer 11. This not only reduces the total thickness of the top cover plate 10 and improves the space utilization rate of the internal height of the battery cell 1, but also enables the top cover assembly to achieve high space utilization while possessing good structural strength. Because the overall strength of the top cover plate 10 is improved, it is less prone to deformation during use, enhancing the safety performance of the battery cell.
[0053] In some embodiments, please refer to Figure 5Along the thickness direction of the top cover plate 10, the thickness of the metal layer 11 is 'a', satisfying the condition: 0.1mm ≤ a ≤ 1.5mm. For example, 'a' can be located within multiple ranges such as 0.2mm ≤ a ≤ 1.5mm, 0.5mm ≤ a ≤ 1.5mm, 0.5mm ≤ a ≤ 1.2mm, 0.5mm ≤ a ≤ 1.0mm, and 0.8mm ≤ a ≤ 1.0mm. Specifically, 'a' can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, and 1.5mm, including but not limited to the listed values. Other values between any two of the above are still applicable. This allows the metal layer 11 to have sufficient strength while making its thickness thinner than in the prior art, thereby improving the space utilization rate of the internal height of the battery cell. When a < 0.1 mm, the thickness of the metal layer 11 is too small, resulting in insufficient strength and consequently lower strength of the top cover plate 10. When a > 1.5 mm, the thickness of the metal layer 11 is too large, leading to a larger total thickness of the top cover plate 10. This occupies a significant portion of the internal height space of the battery cell, reducing the space utilization rate within the battery cell.
[0054] In some embodiments, please refer to Figure 5 Along the thickness direction of the top cover plate 10, the thickness of the metal layer 11 is 'a', and the total thickness of the top cover plate 10 is 'b', satisfying the condition: 5% ≤ a / b ≤ 60%. For example, a / b can fall within multiple ranges such as 5% ≤ a / b ≤ 55%, 10% ≤ a / b ≤ 55%, 15% ≤ a / b ≤ 50%, 20% ≤ a / b ≤ 45%, 25% ≤ a / b ≤ 40%, and 30% ≤ a / b ≤ 40%. Specifically, a / b can be 5%, 8%, 10%, 13%, 15%, 18%, 20%, 23%, 25%, 27%, 30%, 35%, 38%, 40%, 43%, 45%, 50%, 55%, 60%, etc., including but not limited to the listed values; other values between any two of the above are still applicable. This configuration ensures that the top cover plate 10 has sufficient strength, while the total thickness of the top cover plate 10 is thinner than in the prior art, improving the space utilization rate of the internal height of the battery cell. When a / b < 5%, the thickness of the metal layer 11 is too small, resulting in low strength of the top cover plate 10. When a / b > 60%, the thickness of the metal layer 11 is too large, resulting in a large total thickness of the top cover plate 10, which occupies a large amount of internal height space of the battery cell and reduces the internal space utilization rate of the battery cell.
[0055] like Figure 2 or Figure 8As shown, the second insulating member 122 includes an insulating body 129 and a second protrusion 123. The insulating body 129 has at least one first through hole 125 extending through its thickness direction. The number of first through holes 125 can be one, two, three, four, five, or even more. When there are multiple first through holes 125, they can be connected or independent of each other. At least a portion of the first insulating member 121 is accommodated in the first through hole 125. This enhances the bonding force between the first insulating member 121 and the second insulating member 122, improving the connection reliability of the insulating layer 12. The second protrusion 123 is located at both ends of the insulating body 129 along its length direction, and protrudes from the insulating body 129 in a direction away from the metal layer 11.
[0056] like Figure 12 As shown, the second protrusion 123 is used to abut against the electrode assembly 20. In some embodiments, the second protrusion 123 abuts against the corner portion 21 of the electrode assembly 20 to prevent the electrode assembly 20 from shifting. It is understood that at least a portion of the orthographic projection of the second protrusion 123 falls on the surface of the corner portion 21 so that the second protrusion 123 can abut against the electrode assembly 20, limiting the electrode assembly 20 and preventing it from shifting. At the same time, since the mechanical strength of the second insulating member 122 is greater than that of the first insulating member 121, and the second insulating member 122 also has better heat resistance, even when the internal temperature of the battery cell rises sharply, the second protrusion 123 is not easily deformed or melted, and can stably abut against the electrode assembly 20, avoiding short circuits and thermal runaway, and improving the safety performance of the battery cell.
[0057] In some embodiments, please refer to Figures 1 to 5 Along the thickness direction of the top cover plate 10, an insulating body 129 and at least a portion of a first insulating member 121 are stacked. It is understood that at least a portion of the first insulating member 121 is disposed on the surface of the insulating body 129, so that the first insulating member 121 and the second insulating member 122 form a two-layer insulating layer 12. In some embodiments, along the length direction of the top cover plate 10, the length of the metal layer 11 is greater than the length of the insulating body 129 of the second insulating member 122, and the length of the insulating body 129 of the second insulating member 122 is greater than the length of the first insulating member 121. Therefore, along the length direction of the top cover plate 10, both ends of the insulating body 129 can cover both ends of the first insulating member 121, and second protrusions 123 are formed at both ends of the insulating body 129 of the second insulating member 122. This allows the second protrusions 123 of the second insulating member 122 to stably abut against the electrode assembly 20.
[0058] Please refer to Figure 2The first insulating member 121 has at least one first protrusion 120 on its surface facing the insulating body 129. It is understood that the shape of the first protrusion 120 can match the shape of the first through hole 125. The first protrusion 120 is confined within the first through hole 125. For example... Figure 1 or Figure 5 As shown, along the thickness direction of the top cover plate 10, the surface of the first protrusion 120 and the surface of the insulating body 129 facing away from the first insulating member 121 are on the same plane. The side of the first insulating member 121 facing the metal layer 11 is connected to the metal layer 11. This enhances the bonding force between the metal layer 11 and the second insulating member 122, between the second insulating member 122 and the first insulating member 121, and between the metal layer 11 and the first insulating member 121, improving the connection reliability between adjacent layers and making the top cover plate 10 form an integral structure.
[0059] In other embodiments, please refer to Figures 7 to 10 Along the thickness direction of the top cover plate 10, the first insulating member 121 is embedded within the second insulating member 122. For example... Figure 7 As shown, the first insulating member 121 is embedded in the first through hole 125 of the second insulating member 122, and the surface of the first insulating member 121 facing the metal layer 11 is flush with the surface of the second insulating member 122 facing the metal layer 11. The surface of the first insulating member 121 away from the metal layer 11 is flush with the surface of the insulating body 129 away from the metal layer 11. It can be understood that the first insulating member 121 and the second insulating member 122 form an embedded structure so that the first insulating member 121 and the second insulating member 122 form a layered insulating layer 12. This arrangement prevents the total thickness of the top cover plate 10 from being too large, and at the same time, the second insulating member 122 can be used to compensate for the overall strength of the top cover plate 10, so that the top cover plate 10 has sufficient strength and also improves the space utilization rate of the internal height of the battery cell. At the same time, since the heat dissipation of the second insulating member 122 is better than that of the first insulating member 121, this arrangement can remove the heat of the first insulating member 121 through the second insulating member 122, avoiding the first insulating member 121 from being deformed by heat.
[0060] Since the first insulating member 121 is embedded within the second insulating member 122, along the length of the top cover plate 10, the two ends of the insulating body 129 of the second insulating member 122 can cover the two ends of the first insulating member 121, and second protrusions 123 are formed at the two ends of the insulating body 129 of the second insulating member 122. Along the width of the top cover plate 10, the width of the insulating body 129 of the second insulating member 122 is greater than the width of the first insulating member 121. Therefore, the insulating body 129 can wrap around the perimeter of the first insulating member 121, thereby increasing the contact area between the first insulating member 121 and the second insulating member 122 and improving their bonding strength.
[0061] In some embodiments, please refer to Figure 2 or Figure 8 The first through hole 125 is elongated and / or arc-shaped. It is understood that when at least two first through holes 125 are provided on the second insulating member 122, the shapes of the first through holes 125 can all be elongated, all be arc-shaped, or a combination of both. In some embodiments, the first through holes 125 are arranged on the insulating body 129 along its length direction and / or its width direction. It is understood that when the insulating body 129 is provided with at least two first through holes 125, adjacent first through holes 125 can be arranged along the length direction, along the width direction, or simultaneously along both directions. This arrangement allows at least a portion of the first insulating member 121 to pass through the first through hole 125 and connect to the metal layer 11, improving the connection reliability between adjacent layers and facilitating the forming of the first insulating member 121.
[0062] In some embodiments, the total area of the first through hole 125 is S1, and the area of the orthographic projection region of the outer contour of the second insulating member 122 on a dummy plane perpendicular to the thickness direction of the top cover plate 10 is S2, satisfying: 10%≤S1 / S2≤70%; for example, S1 / S2 can be within multiple intervals such as 10%≤S1 / S2≤65%, 10%≤S1 / S2≤50%, 15%≤S1 / S2≤70%, 15%≤S1 / S2≤60%, 15%≤S1 / S2≤45%, 20%≤S1 / S2≤50%, 25%≤S1 / S2≤45%. Specifically, S1 / S2 can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc., including but not limited to the listed values, and other values between any two of the above still apply. It is understandable that the total opening area of the first through hole 125 refers to the sum of the areas of the cross-sections of all the first through holes 125 on the insulating body 129 perpendicular to the hole axis. This configuration ensures the reliability of the connection between the metal layer 11, the first insulating member 121, and the second insulating member 122, while also guaranteeing the strength of the second insulating member 122. If S1 / S2 < 10%, the total opening area of the first through hole 125 is too small, resulting in low reliability of the connection between the metal layer 11, the first insulating member 121, and the second insulating member 122. If S1 / S2 > 70%, the total opening area of the first through hole 125 is too large, affecting the strength of the second insulating member 122 and thus reducing the strength of the top cover plate 10.
[0063] In some embodiments, please refer to Figure 5Along the thickness direction of the top cover plate 10, the minimum distance h between the surface of the second protrusion 123 away from the insulating body 129 and the surface of the insulating body 129 satisfies: 2mm ≤ h ≤ 8mm. For example, h can be within the ranges of 2mm ≤ h ≤ 7.5mm, 2.5mm ≤ h ≤ 8mm, 3mm ≤ h ≤ 8mm, 3.5mm ≤ h ≤ 7mm, 4mm ≤ h ≤ 6.5mm, etc. Specifically, h can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc., including but not limited to the listed values, and other values between any two of the above still apply. This design ensures that the second protrusion 123 has sufficient thickness and strength without excessively occupying the internal height space of the battery cell. The second protrusion 123 abuts against the corner 21 of the electrode assembly 20, effectively preventing displacement of the electrode assembly 20. Furthermore, the sufficient thickness and strength of the second protrusion 123 prevents deformation or melting when the internal temperature of the battery cell rises sharply, avoiding internal short circuits and improving the safety performance of the battery cell. When h < 2 mm, the thickness and strength of the second protrusion 123 are too small, making it prone to deformation or melting when the internal temperature of the battery cell rises sharply, potentially leading to internal short circuits. When h > 8 mm, the thickness of the second protrusion 123 is too large, excessively occupying the internal height space of the battery cell and reducing space utilization.
[0064] In some embodiments, please refer to Figure 6Along the length of the top cover plate 10, the maximum width of the second protrusion 123 is L1, satisfying: 3mm≤L1≤20mm. For example, L1 can be within the ranges of 3mm≤L1≤15mm, 4mm≤L1≤15mm, 5mm≤L1≤13mm, 6mm≤L1≤10mm, 3mm≤L1≤10mm, etc. Specifically, L1 can be 3mm, 4mm, 6mm, 7mm, 9mm, 10mm, 12mm, 13mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc., including but not limited to the listed values, and other values between any two of the above still apply. This design ensures that the second protrusion 123 has sufficient width and strength. The second protrusion 123 abuts against the corner 21 of the electrode assembly 20, effectively preventing displacement of the electrode assembly 20. Simultaneously, the sufficient width and strength of the second protrusion 123 prevents deformation or melting when the internal temperature of the battery cell rises sharply, avoiding internal short circuits and improving the safety performance of the battery cell. When L1 < 3mm, the width of the second protrusion 123 is too small, making it difficult to limit the electrode assembly 20, which makes the electrode assembly 20 prone to displacement and deformation or melting when the internal temperature of the battery cell rises sharply, leading to internal short circuits. When L1 > 20mm, the width of the second protrusion 123 is too large, occupying excessive space in the length direction of the top cover plate 10, which is detrimental to the arrangement of other structural components.
[0065] In some embodiments, please refer to Figure 6Along the length of the top cover plate 10, the maximum width of the second protrusion 123 is L1, and along the width of the top cover plate 10, the width of the metal layer 11 is L2, satisfying: 5%≤L1 / L2≤50%. For example, L1 / L2 can be within the range of 5%≤L1 / L2≤40%, 5%≤L1 / L2≤30%, 8%≤L1 / L2≤50%, 9%≤L1 / L2≤40%, 10%≤L1 / L2≤40%, 10%≤L1 / L2≤30%, 15%≤L1 / L2≤24%, etc. Specifically, L1 / L2 can be 5%, 7%, 9%, 10%, 13%, 15%, 17%, 20%, 25%, 27%, 30%, 33%, 35%, 38%, 40%, 42%, 44%, 45%, 47%, 48%, 50%, etc., including but not limited to the listed values. Other values between any two of the above are still applicable. This design ensures that the second protrusion 123 has sufficient width and strength. The second protrusion 123 abuts against the corner 21 of the electrode assembly 20, effectively preventing displacement of the electrode assembly 20. Simultaneously, the sufficient width and strength of the second protrusion 123 prevents deformation or melting when the internal temperature of the battery cell rises sharply, avoiding internal short circuits and improving the safety performance of the battery cell. Furthermore, this design avoids the second protrusion 123 occupying excessive space, thus preventing interference with the arrangement of other structural components. When L1 / L2 < 5%, the width of the second protrusion 123 is too small, making it difficult to limit the electrode assembly 20, which can easily lead to displacement and deformation or melting when the internal temperature of the battery cell rises sharply, resulting in internal short circuits. When L1 / L2 > 50%, the width of the second protrusion 123 is too large, excessively occupying space along the length of the top cover plate 10, which is detrimental to the arrangement of other structural components.
[0066] In some embodiments, the metal layer 11, the first insulating member 121, and the second insulating member 122 are integral structures. It is understood that the first insulating member 121 can be injection molded onto the metal layer 11 and the second insulating member 122 so that the metal layer 11, the first insulating member 121, and the second insulating member 122 are formed as a whole and can be used as a whole.
[0067] In some embodiments, the first insulating member 121 is nano-injection molded onto the second insulating member 122 and the metal layer 11. To achieve nano-injection molding of the first insulating member 121, the metal layer 11 has a first nanopore on its surface in contact with the first insulating member 121, and at least a portion of the first insulating member 121 is embedded in the first nanopore and connected to the metal layer 11. The second insulating member 122 has a second nanopore on its surface in contact with the first insulating member 121, and at least a portion of the first insulating member 121 is embedded in the second nanopore and connected to the second insulating member 122. This improves the bonding force between the first insulating member 121, the second insulating member 122, and the metal layer 11. During manufacturing, the surface treatment of the metal layer 11 and the second insulating member 122 can be chemically etched to form a nanopore structure, thereby increasing the connection area between the first insulating member 121 and the metal layer 11 and the second insulating member 122, and improving the bonding force between the first insulating member 121 and the metal layer 11 and the second insulating member 122.
[0068] In some embodiments, the area of the connection surface between the first insulating member 121 and the metal layer 11 is S4, satisfying: 300mm² 2 ≤S4≤15000mm 2 For example: S4 can be located at 300mm. 2 ≤S4≤14000mm 2 400mm 2 ≤S4≤15000mm 2 500mm 2 ≤S4≤14000mm 2 600mm 2 ≤S4≤13000mm 2 700mm 2 ≤S4≤12000mm 2 800mm 2 ≤S4≤11000mm 2 900mm 2 ≤S4≤11000mm 2 1000mm 2 ≤S4≤10000mm 2 Within multiple intervals. Specifically, S4 can be 300mm. 2 800mm 2 1300mm 2 1800mm 2 2300mm 2 2800mm 2 3300mm 2 3800mm 2 3300mm 2 3800mm2 4300mm 2 4800mm 2 5300mm 2 5800mm 2 6300mm 2 6800mm 2 7300mm 2 7800mm 2 8300mm 2 8800mm 2 9300mm 2 9800mm 2 10300mm 2 10800mm 2 11300mm 2 11800mm 2 12300mm 2 12800mm 2 13300mm 2 13800mm 2 14300mm 2 14800mm 2 15000mm 2 And so on, including but not limited to the values listed, other values between any two of the above still apply. This arrangement can increase the connection reliability between the first insulating element 121 and the metal layer 11 when S4 < 300 mm. 2 The connection area between the first insulating element 121 and the metal layer 11 is too small, resulting in low reliability of the connection between the first insulating element 121 and the metal layer 11. When S4 > 15000 mm 2 If the connection area between the first insulating element 121 and the metal layer 11 is too large, it will cause the total opening area of the first through hole 125 of the second insulating element 122 to be too large, which will affect the strength of the second insulating element 122.
[0069] In some embodiments, on a virtual plane perpendicular to the thickness direction of the top cover plate 10, the area of the orthographic projection region of the outer contour of the metal layer 11 is S5, satisfying: 1300 mm². 2 ≤S5≤20000mm 2 For example: S5 can be located at 1300mm. 2 ≤S5≤15000mm 2 2000mm 2 ≤S5≤15000mm 2 3000mm 2 ≤S5≤14000mm 2 4000mm 2 ≤S5≤13000mm2 5000mm 2 ≤S5≤12000mm 2 6000mm 2 ≤S5≤11000mm 2 7000mm 2 ≤S5≤11000mm 2 8000mm 2 ≤S5≤10000mm 2 Within multiple ranges. Specifically, S5 can be 1300mm. 2 1800mm 2 2300mm 2 2800mm 2 3300mm 2 3800mm 2 3300mm 2 3800mm 2 4300mm 2 4800mm 2 5300mm 2 5800mm 2 6300mm 2 6800mm 2 7300mm 2 7800mm 2 8300mm 2 8800mm 2 9300mm 2 9800mm 2 10300mm 2 10800mm 2 11300mm 2 11800mm 2 12300mm 2 12800mm 2 13300mm 2 13800mm 2 14300mm 2 14800mm 2 15000mm 2 15800mm 2 16300mm 2 17800mm 2 18800mm 2 19800mm 2 20000mm 2And so on, including but not limited to the values listed, other values between any two of the above still apply. In this way, the metal layer 11 can have sufficient strength.
[0070] In some embodiments, the connection area between the first insulating member 121 and the metal layer 11 is S4, and the area of the orthographic projection region of the outer contour of the metal layer 11 on a dummy plane perpendicular to the thickness direction of the top cover plate 10 is S5, satisfying: 20% ≤ S4 / S5 ≤ 75%. For example, S4 / S5 can be located within multiple intervals such as 20% ≤ S4 / S5 ≤ 70%, 30% ≤ S4 / S5 ≤ 65%, 35% ≤ S4 / S5 ≤ 60%, 40% ≤ S4 / S5 ≤ 55%, etc. Specifically, S4 / S5 can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 75%, etc., including but not limited to the listed values, and other values between any two of the above still apply. This configuration can increase the connection reliability between the first insulating member 121 and the metal layer 11. When S4 / S5 is less than 20%, the connection area between the first insulating element 121 and the metal layer 11 is too small, resulting in low connection reliability between the first insulating element 121 and the metal layer 11. When S4 / S5 > 75%, the connection area between the first insulating element 121 and the metal layer 11 is too large, which will result in an excessively large total opening area of the first through hole 125 of the second insulating element 122, affecting the strength of the second insulating element 122.
[0071] In some embodiments, please refer to Figure 1 , Figure 2 or Figure 7 , Figure 8 The metal layer 11 is provided with a first liquid injection hole 112, and the insulating body 129 of the second insulating member 122 is provided with a second liquid injection hole 126 corresponding to the first liquid injection hole 112; so that electrolyte can be injected into the battery cell through the first liquid injection hole 112 and the second liquid injection hole 126.
[0072] In some embodiments, please refer to Figure 1 , Figure 2 or Figure 7 , Figure 8 The metal layer 11 is provided with a pressure relief mechanism 113, and the second insulating member 122 is provided with an exhaust port 127 corresponding to the pressure relief mechanism 113. When the internal gas pressure of the battery cell increases, the exhaust port 127 is used to allow the gas inside the battery cell to be discharged through the exhaust port 127 and from the pressure relief mechanism 113, so as to avoid thermal runaway.
[0073] In some embodiments, please refer to Figure 1 , Figure 2 or Figure 7 , Figure 8A protective film 15 is provided on the surface of the metal layer 11 away from the insulating layer 12 to protect and insulate the metal layer 11.
[0074] As one embodiment of the top cover assembly, please refer to Figure 1 , Figure 2 or Figure 7 , Figure 8 The top cover assembly also includes: a terminal post 13 and a third insulating member 14. The third insulating member 14 and the first insulating member 121 are integrally formed. The terminal post 13 is fixed to the top cover plate 10. The terminal post 13 can be electrically connected to the electrode assembly 20 for outputting or inputting electrical energy from the battery cell. The terminal post 13 includes a positive terminal post and a negative terminal post. The positive terminal post is used to connect to the positive electrode tab, thereby introducing the positive current of the battery cell into the interior of the housing 30 or leading it out to the exterior of the housing 30. The negative terminal post is used to connect to the negative electrode tab, thereby introducing the negative current of the battery cell into the interior of the housing 30 or leading it out to the exterior of the housing 30. The positive and negative terminals of adjacent battery cells can be electrically connected in series, parallel, or mixed configurations using electrical connectors. It should be noted that the "terminal post 13" mentioned in this application can be either a positive terminal post or a negative terminal post (unless otherwise explicitly stated). Simply ensure that the tab connected to the positive terminal is the positive terminal tab, and the tab connected to the negative terminal is the negative terminal tab.
[0075] Please refer to Figure 5 or Figure 10 The third insulating element 14 is fixed between the terminal post 13 and the metal layer 11 to insulate the terminal post 13 and the metal layer 11. The third insulating element 14 can be made of plastic materials, such as PP, PE, PPS, etc.
[0076] It is understood that the top cover plate 10 of this application can, together with the pole post 13, the third insulating member 14, and other functional components, form a top cover assembly. Other functional components may also be insulating structures such as upper plastic and lower plastic.
[0077] Please refer to Figure 5 or Figure 10 The third insulating member 14 includes a first insulating portion 141 and a second insulating portion 142, which are integrally formed. The first insulating portion 141, the second insulating portion 142, and the first insulating member 121 are located on the side of the metal layer 11 opposite to the insulating layer 12. In some embodiments, to fix the first insulating portion 141 and the metal layer 11, at least a portion of the first insulating portion 141 is projected onto the surface of the metal layer 11, so that the first insulating portion 141 and the first insulating member 121 engage and fix the metal layer 11 on both surfaces in the thickness direction of the metal layer 11. Please refer to... Figure 1 or Figure 7The metal layer 11 has a second through hole 111 extending through its thickness direction, and the second insulating part 142 is disposed between the hole wall of the second through hole 111 and the electrode post 13. The side of the second insulating part 142 away from the first insulating part 141 is connected to the first insulating member 121 as a whole, thus eliminating the need for a sealing ring structure and improving the utilization rate of the internal space of the battery cell.
[0078] Please refer to Figure 2 or Figure 8 The second insulating member 122 is further provided with a third through hole 124 extending through its thickness direction. On a dummy plane perpendicular to the thickness direction of the top cover plate 10, the orthographic projection of the third through hole 124 overlaps the orthographic projection of the second through hole 111. In some embodiments, the central axis of the third through hole 124 coincides with the central axis of the second through hole 111. On a dummy plane perpendicular to the thickness direction of the top cover plate 10, the diameter of the second through hole 111 of the metal layer 11 is smaller than the diameter of the third through hole 124 of the second insulating member 122. Figure 5 or Figure 10 As shown, at least a portion of the first insulating member 121 passes through the third through hole 124 and connects to the metal layer 11. Simultaneously, the portion of the first insulating member 121 passing through the third through hole 124 is integrally formed with the second insulating portion 142. Thus, the pole post 13 can be inserted into the third through hole 124 and the second through hole 111, thereby fixing the second insulating member 122 and the pole post 13 and reducing the risk of the pole post 13 detaching.
[0079] In some embodiments, please refer to Figure 2 or Figure 8 On the second insulating member 122, at least a portion of the first through hole 125 is arranged in an arc around the third through hole 124 in a circumferential manner. For example, as Figure 2 or Figure 8 As shown, two arc-shaped first through holes 125 are provided around the third through hole 124. The design of the arc-shaped first through holes 125 can increase the connection area of the first insulating member 121, the second insulating member 122 and the metal layer 11, and improve the connection reliability between the metal layer 11, the second insulating member 122 and the first insulating member 121.
[0080] In some embodiments, please refer to Figure 1 , Figure 5 or Figure 7 , Figure 10The electrode post 13 includes a first connecting portion 131 and a second connecting portion 132. The first connecting portion 131 passes through the second through hole 111 and the third through hole 124 and is connected to an electrical connector. The second connecting portion 132 is disposed on the side surface of the insulating layer 12 facing away from the metal layer 11 and is used to connect to the tab of the electrode assembly 20. In some embodiments, on a dummy plane perpendicular to the thickness direction of the top cover plate 10, the orthographic projection of the second connecting portion 132 is larger than the orthographic projection of the first connecting portion 131, and at least a portion of the orthographic projection of the second connecting portion 132 falls on the surface of the insulating layer 12, so that the second connecting portion 132 can be engaged on the surface of the insulating layer 12 facing away from the metal layer 11.
[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 top cover assembly, characterized in that, include: The top cover plate (10) includes a metal layer (11) and an insulating layer (12) along its thickness direction. The insulating layer (12) includes a first insulating element (121) and a second insulating element (122), wherein the mechanical strength of the second insulating element (122) is greater than that of the first insulating element (121). The second insulating element (122) includes an insulating body (129) and a second protrusion (123). The insulating body (129) is provided with at least one first through hole (125) penetrating its thickness direction. At least a portion of the first insulating element (121) is provided in the first through hole (125). The second protrusion (123) is provided at both ends of the insulating body (129) along its length direction. The second protrusion (123) protrudes from the insulating body (129) in a direction away from the metal layer (11).
2. The top cover assembly according to claim 1, characterized in that, Along the thickness direction of the top cover plate (10), the insulating body (129) and at least a portion of the first insulating element (121) are stacked.
3. The top cover assembly according to claim 2, characterized in that, The first insulating member (121) has at least one first protrusion (120) on the surface facing the insulating body (129). The first protrusion (120) is located within the first through hole (125). Along the thickness direction of the top cover plate (10), the surface of the first protrusion (120) and the surface of the insulating body (129) away from the first insulating member (121) are on the same plane. The side of the first insulating member (121) facing the metal layer (11) is connected to the metal layer (11).
4. The top cover assembly according to claim 1, characterized in that, Along the thickness direction of the top cover plate (10), the first insulating member (121) is embedded in the second insulating member (122).
5. The top cover assembly according to claim 4, characterized in that, The first insulating member (121) is embedded in the first through hole (125) of the second insulating member (122), and the surface of the first insulating member (121) facing the metal layer (11) is flush with the surface of the second insulating member (122) facing the metal layer (11), and the surface of the first insulating member (121) away from the metal layer (11) is flush with the surface of the insulating body (129) away from the metal layer (11).
6. The top cover assembly according to any one of claims 1 to 5, characterized in that, The metal layer (11), the first insulating element (121) and the second insulating element (122) are an integral structure.
7. The top cover assembly according to claim 6, characterized in that, The metal layer (11) has a first nanopore on the surface in contact with the first insulating member (121), and at least a portion of the first insulating member (121) is embedded in the first nanopore and connected to the metal layer (11); and / or, The second insulating member (122) has a second nanopore on the surface that contacts the first insulating member (121), and at least a portion of the first insulating member (121) is embedded in the second nanopore and connected to the second insulating member (122).
8. The top cover assembly according to claim 6, characterized in that, The connection area between the first insulating element (121) and the metal layer (11) is S4, satisfying: 300mm² 2 ≤S4≤15000mm 2 ; and / or, On a virtual plane perpendicular to the thickness direction of the top cover plate (10), the area of the orthographic projection region of the outer contour of the metal layer (11) is S5, satisfying: 1300mm². 2 ≤S5≤20000mm 2 ; and / or, Satisfying: 20% ≤ S4 / S5 ≤ 75%; and / or, Along the thickness direction of the top cover plate (10), the thickness of the metal layer (11) is a, satisfying: 0.1mm ≤ a ≤ 1.5mm; and / or, Along the thickness direction of the top cover plate (10), the thickness of the metal layer (11) is a, and the total thickness of the top cover plate (10) is b, satisfying: 5%≤a / b≤60%.
9. The top cover assembly according to any one of claims 1 to 5, characterized in that, Along the thickness direction of the top cover plate (10), the minimum distance h between the surface of the second protrusion (123) away from the insulating body (129) and the surface of the insulating body (129) satisfies: 2mm ≤ h ≤ 8mm; and / or, Along the length of the top cover plate (10), the maximum width of the second protrusion (123) is L1, satisfying: 3mm ≤ L1 ≤ 20mm; and / or, Along the length direction of the top cover plate (10), the maximum width of the second protrusion (123) is L1, and along the width direction of the top cover plate (10), the width of the metal layer (11) is L2, satisfying: 5%≤L1 / L2≤50%.
10. The top cover assembly according to any one of claims 1 to 5, characterized in that, The first through hole (125) is elongated and / or arc-shaped; and / or, The first through hole (125) is arranged on the insulating body (129) along its length and / or along its width; and / or, The total area of the first through hole (125) is S1, and the area of the orthographic projection region of the outer contour of the second insulating member (122) on a fictitious plane perpendicular to the thickness direction of the top cover plate (10) is S2, satisfying: 10%≤S1 / S2≤70%; and / or, The metal layer (11) is provided with a first liquid injection hole (112), and the insulating body (129) is provided with a second liquid injection hole (126) corresponding to the first liquid injection hole (112); and / or, The metal layer (11) is provided with a pressure relief mechanism (113), and the insulating body (129) is provided with an exhaust hole (127) corresponding to the pressure relief mechanism (113).
11. A single battery cell, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 10.
12. A single battery cell, characterized in that, include: The housing (30) has an opening; At least one electrode assembly (20) is housed within the housing (30), the electrode assembly (20) having a corner portion (21). The top cover assembly according to any one of claims 1 to 10, wherein the second protrusion (123) of the top cover assembly abuts against the corner portion (21) of the electrode assembly (20).
13. A battery, characterized in that, Includes the battery cell described in claim 11 or claim 12.
14. An electrical appliance, characterized in that, It includes the battery cell as described in claim 11 or claim 12, or the battery as described in claim 13.