Top cover assembly and processing method, battery monomer, battery and electric device

Abstract

This application provides a top cover assembly and processing method, a battery cell, a battery, and an electrical device, relating to the field of battery technology. The top cover assembly includes a top cover sheet and terminals. The top cover sheet has at least two first through holes and at least one second through hole extending along its thickness direction. The at least two first through holes are spaced apart along the width direction of the top cover sheet, and the at least one second through hole is located between two adjacent first through holes. The terminals include at least one first connecting portion and at least two second connecting portions. Each first connecting portion connects to two adjacent second connecting portions. The first connecting portions are located on one side of the top cover sheet, and along the thickness direction of the top cover sheet, the orthographic projection of the first connecting portion covers all the second through holes. At least a portion of each second connecting portion is correspondingly inserted into one of the first through holes. Therefore, during injection molding, a support member can be used to fix the relative position of the terminals and the top cover sheet, making it less prone to displacement and deformation of the terminals.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a top cover assembly and its processing method, a battery cell, a battery, and an electrical device. Background Technology

[0002] In related technologies, an insulating component is typically installed between the terminal and the top cover plate of a battery cell. This insulating component prevents short circuits between the terminal and the top cover plate and ensures stable chemical reactions within the battery. In actual production, the production personnel first position the terminal above the top cover plate using tooling, and then use high-pressure injection molding to form the insulating component between the terminal and the top cover plate.

[0003] However, during the injection molding of insulating parts, the pole and the top cover are suspended, resulting in no positioning between them. Under high-pressure injection molding, the pole is prone to displacement and deformation, which in turn affects the molding effect of the entire insulating part. Therefore, how to improve the stability of the pole during the injection molding process has become an urgent problem to be solved in the industry. Summary of the Invention

[0004] The purpose of this application is to provide a top cover assembly and processing method, a battery cell, a battery, and an electrical device to solve the technical problem that the terminal post is prone to displacement during the injection molding process of the insulating part in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides a top cover assembly, comprising: a top cover sheet and an electrode post. The top cover sheet has at least two first through holes and at least one second through hole extending through its thickness direction, wherein the at least two first through holes are spaced apart along the width direction of the top cover sheet, and the at least one second through hole is disposed between two adjacent first through holes; the electrode post includes at least one first connecting portion and at least two second connecting portions, and each first connecting portion is connected to two adjacent second connecting portions. The first connecting portion is located on one side of the top cover sheet and is used to connect with an electrical connector. Along the thickness direction of the top cover sheet, the orthographic projection of the first connecting portion covers all the second through holes, and at least a portion of each second connecting portion is correspondingly inserted into one of the first through holes for connection with an electrode tab.

[0006] In one or more embodiments of this application, it further includes: a first insulating member, which is used to fix the pole post and the top cover plate. The first insulating member has a first insulating portion disposed between the top cover plate and the first connecting portion. The first insulating portion has a third through hole extending through it along its thickness direction. The third through hole and the second through hole are provided in a one-to-one correspondence, and the central axis of the second through hole and the central axis of the third through hole overlap.

[0007] In one or more embodiments of this application, a support portion is provided between two adjacent first through holes along the width direction of the top cover sheet. The support portion supports the first insulating portion and the first connecting portion. The second through hole penetrates the support portion, and all the second through holes are symmetrically arranged about the center line of the width direction of the top cover sheet.

[0008] In one or more embodiments of this application, it further includes: a second insulating member and a third insulating member, the second insulating member being disposed on the side of the top cover sheet away from the first insulating member; the third insulating member being filled in the second through hole and the third through hole, and along the thickness direction of the top cover sheet, one end of the third insulating member is in contact with the first connecting portion, and the other end of the third insulating member is in contact with the second insulating member.

[0009] In one or more embodiments of this application, the walls of the second through hole and / or the third through hole are provided with nanopores, and a portion of the third insulating element is embedded in the nanopores.

[0010] In one or more embodiments of this application, the third insulating member and the second insulating member are integrally formed.

[0011] In one or more embodiments of this application, the thermal conductivity of the third insulating element is greater than that of the first insulating element.

[0012] In one or more embodiments of this application, on a dummy plane perpendicular to the thickness direction of the top cover sheet, the outer contour area of ​​the orthographic projection region of the support portion is A, and the opening area of ​​all second through holes is B, satisfying: 1% ≤ B / A ≤ 30%; and / or, Along the width direction of the top cover plate, the minimum distance between the wall of the second through hole and the wall of the first through hole is a, which satisfies: a≥2mm.

[0013] In one or more embodiments of this application, a groove is provided on the side of the first connecting portion facing the top cover plate, the groove and the second through hole are respectively provided, and the central axis of the groove overlaps with the central axis of the second through hole.

[0014] In one or more embodiments of this application, along the thickness direction of the top cover sheet, the depth of the groove is H1, and the thickness of the first connecting part is T1, satisfying: T1>H1≥0.2mm, or, H1=b×T1, 0.2≤b≤0.9, or, T1-H1≥0.5mm.

[0015] Secondly, this application provides a battery cell, including: a housing, an electrode assembly, and a top cover assembly as described in the first aspect, wherein the housing has an opening; the electrode assembly has tabs and is housed within the housing; and the top cover assembly covers the opening of the housing.

[0016] Thirdly, this application provides a battery, including a battery cell as described in the second aspect.

[0017] Fourthly, this application provides an electrical device, including a battery cell as described in the second aspect, or a battery as described in the third aspect.

[0018] Fifthly, this application provides a method for processing a top cover assembly, comprising the following steps: The pole is assembled onto the top cover plate, such that at least a portion of each second connection of the pole is correspondingly inserted into a first through hole, and a gap is formed between the first connection and the top cover plate; The support member passes through the second through hole from the side of the top cover plate away from the first connecting part of the pole post, so that the end of the support member contacts the first connecting part of the pole post. A first insulating component is injection molded between the pole post and the top cover plate, and the first insulating part of the first insulating component fills the gap, and a third through hole is formed around the support on the first insulating part. After injection molding is completed, remove the support components.

[0019] Based on the above technical solutions, the top cover assembly and processing method, battery cell, battery, and power device provided in this application have at least the following beneficial technical effects: The top cover assembly provided in this application embodiment has at least two first through holes and at least one second through hole on the top cover sheet. At least one second through hole is located between two adjacent first through holes. The first through hole allows the second connecting part of the pole post to pass through and connect with the pole tab. The first connecting part of the pole post is located on one side of the top cover sheet and is used to connect with the electrical connector. Along the thickness direction of the top cover sheet, the orthographic projection of the first connecting part of the pole post covers all the second through holes. Thus, when the first insulating part of the top cover assembly is injection molded, the support member can pass through the second through hole from the side of the top cover sheet away from the first connecting part of the pole post to support the first connecting part of the pole post. During the injection molding process, the support member can be used to fix the relative position of the pole post and the top cover sheet, so that the pole post is not prone to positional displacement and deformation relative to the top cover sheet, ensuring uniform filling thickness between the first connecting part of the pole post and the top cover sheet, as well as the stability and flatness of the pole post installation, thereby improving the quality of the top cover assembly. 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 a three-dimensional structural diagram of a battery cell provided in an embodiment of this application.

[0022] Figure 2This is a schematic diagram of the exploded decomposition structure of a battery cell provided in an embodiment of this application.

[0023] Figure 3 This is a top view of the top cover assembly provided in an embodiment of this application.

[0024] Figure 4 yes Figure 3 AA section view.

[0025] Figure 5 This is an exploded structural diagram of a top cover assembly provided in one embodiment of this application.

[0026] Figure 6 This is a partial longitudinal cross-sectional view of a top cover assembly provided in one embodiment of this application.

[0027] Figure 7 This is an exploded structural diagram of the top cover assembly provided in another embodiment of this application.

[0028] Figure 8 This is a partial longitudinal cross-sectional view of the top cover assembly provided in another embodiment of this application.

[0029] Figure 9 This is a top view of the top cover sheet provided in an embodiment of this application.

[0030] Figure 10 This is a partial structural schematic diagram of the top cover sheet provided in one embodiment of this application.

[0031] Figure 11 This is a partial structural schematic diagram of the top cover sheet provided in another embodiment of this application.

[0032] Figure 12 This is a three-dimensional structural diagram of the pole provided in the embodiment of this application from the bottom view.

[0033] Figure 13 This is a top view of the pole structure provided in the embodiment of this application.

[0034] Figure 14 yes Figure 13 CC cross-section view.

[0035] Figure 15 This is a partial longitudinal cross-sectional view of the top cover assembly provided in another embodiment of this application.

[0036] Figure 16 This is a schematic diagram of the assembly method of the top cover assembly and support provided in the embodiments of this application.

[0037] Figure 17 This is a schematic diagram of the structure of the electrical device provided in the embodiments of this application.

[0038] Figure 18 This is a schematic diagram of the exploded decomposition structure of the battery provided in the embodiment of this application.

[0039] In the diagram: 1000 - Vehicle; 1100 - Battery; 1101 - First housing section; 1102 - Second housing section; 1103 - Housing; 1104 - Battery cell; 100 - Top cover assembly; 200 - Housing; 300 - Electrode assembly; 10 - Top cover plate; 20 - Terminal post; 21 - First connecting part; 22 - Second connecting part; 23 - Transition part; 30 - First insulating component; 31 - First insulating part; 32 - Second insulating part; 33 - Tab; 40 - Second insulating component; 50 - Third insulating component; 101 - First through hole; 102 - Second through hole; 103 - Support part; 104 - First groove; 105 - Through hole; 201 - Second groove; 301 - Third through hole; 400 - Support component; 401 - Fourth through hole. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In related technologies, along the width direction of the battery cell, the terminal post includes a first connecting portion in the middle and two second connecting portions on both sides of the first connecting portion. The first connecting portion is used for welding with electrical connectors, and the second connecting portions are used for welding with the tabs of the electrode assembly. To prevent short circuits between the terminal post and the top cover plate, an insulating component is usually provided between the terminal post and the top cover plate. However, during the injection molding of the insulating component, the first connecting portion of the terminal post and the top cover plate are suspended, resulting in no positioning between the terminal post and the top cover plate. Under high-pressure injection molding, the terminal post is prone to displacement and deformation, especially for terminal posts with a fusible section between the first and second connecting portions. Displacement and deformation are easily caused, making it impossible to ensure uniform thickness of the insulating component filling between the first connecting portion of the terminal post and the top cover plate. This leads to uneven installation of the terminal post, uneven sealing and compression on both sides of the terminal post, and a tendency for air and liquid leakage.

[0045] Based on the above considerations, in order to solve the technical problem that the electrode post is prone to displacement during the injection molding process of the insulating part in the prior art, this application provides an electrical device, a battery, a battery cell, a top cover assembly, and a processing method.

[0046] 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.

[0047] This application describes an electrical device using a vehicle 1000 as an example. Figure 17 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 the vehicle; 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 controls the battery to supply power to the motor, for example, to meet the power needs of starting, navigation, and driving the vehicle. Battery 1100 can not only serve as the operating power source for the vehicle but also as the driving power source for vehicle 1000, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0048] The aforementioned battery can be a battery pack or a battery module. When the aforementioned battery is a battery pack, such as... Figure 18 As shown, the battery includes a housing 1103 and a battery cell 1104, with the battery cell 1104 housed within the battery housing 1103. The housing 1103 provides a space for the battery cell 1104, and can have various structures. In some embodiments, the housing 1103 may include a first housing portion 1101 and a second housing portion 1102, which overlap each other, together defining a space for accommodating the battery cell 1104. Both the first housing portion 1101 and the second housing portion 1102 may be hollow structures with an opening on one side, with the opening side of the first housing portion 1101 overlapping the opening side of the second housing portion 1102, so that the first housing portion 1101 and the second housing portion 1102 together define the accommodating space. Of course, the housing 1103 formed by the first housing portion 1101 and the second housing portion 1102 can be of various shapes, such as a cylinder, a cuboid, etc. The battery pack also includes a battery management system (BMS). Multiple battery cells 1104 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 1104. Alternatively, multiple battery cells 1104 can first be combined with a module management system to form a battery module, and then 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.

[0049] Multiple battery cells 1104 can be mounted on supporting structures such as housings, frames, and brackets. The individual battery cells 1104 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.

[0050] The aforementioned battery cell can be a secondary battery or a primary battery, or it can 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.

[0051] Battery cell 1104 refers to the smallest unit that makes up a battery. As one embodiment of a battery cell, please refer to... Figure 1 and Figure 2 The battery cell 1104 includes a housing 200, an electrode assembly 300, a top cover assembly 100, and other functional components. The housing 200 has an opening at at least one end, and the top cover assembly 100 covers the opening of the housing 200 to isolate the internal environment of the battery cell from the external environment. The housing 200 has a receiving cavity inside to accommodate the electrode assembly 300. The housing 200 is a component used to cooperate with the top cover assembly 100 to form the internal environment of the battery cell, wherein the formed internal environment can accommodate the electrode assembly, electrolyte, and other components. The housing 200 and the top cover assembly 100 can be independent components. An opening can be provided on the housing 200, and the top cover assembly 100 closes the opening to form the internal environment of the battery cell. The housing 200 can have various shapes and sizes, such as cylindrical, cuboid, hexagonal prism, etc. Specifically, the shape of the housing 200 can be determined according to the specific shape and size of the electrode assembly. The shell 200 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0052] As one embodiment of the electrode assembly 300, the electrode assembly 300 is a component in a battery cell that undergoes an electrochemical reaction with the electrolyte. The housing 200 may contain one or more electrode assemblies 300. The electrode assembly 300 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.

[0053] In some embodiments, each electrode assembly extends a positive electrode tab and a negative electrode tab to the end face of the top cover assembly 100, respectively. During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode tabs connect to the terminal posts to form a current loop.

[0054] Before the electrode assembly 300 is installed into the housing 200, the electrode tabs 33 of the electrode assembly 300 are usually assembled with the top cover assembly 100. For example, the electrode post 20 of the top cover assembly 100 is welded to the electrode tabs 33 of the electrode assembly 300, and then the electrode assembly is installed into the housing 200.

[0055] As one embodiment of the top cover assembly 100, please refer to Figures 2 to 5 The top cover assembly 100 includes: a top cover sheet 10, a pole post 20, and a first insulating member 30.

[0056] Among them, as one embodiment of the pole post 20, such as Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 12 and Figure 13 The terminal post 20 is disposed on the top cover plate 10. The terminal post 20 can be electrically connected to the electrode assembly 300 for outputting or inputting electrical energy of the battery cell. The terminal post 20 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 200 or leading it out to the exterior of the housing 200. The positive and negative terminals of adjacent battery cells can be electrically connected in series, parallel, or mixed manner through electrical connecting pieces.

[0057] It should be noted that the "terminal 20" mentioned in this application can be either a positive terminal or a negative terminal (unless otherwise specified). The "tab 33" mentioned in this application can be either a positive or a negative tab (unless otherwise specified), as long as the tab connected to the positive terminal is the positive tab and the tab connected to the negative terminal is the negative tab.

[0058] like Figure 4 , Figure 5 , Figure 7 , Figure 12 and Figure 13 The electrode post 20 includes at least one first connecting portion 21 and at least two second connecting portions 22. The at least two second connecting portions 22 are arranged at intervals along the width direction of the top cover plate 10, and each first connecting portion 21 is connected to two adjacent second connecting portions 22. The first connecting portion 21 is located on one side of the top cover plate 10 and is used to connect with an electrical connector. It can be understood that the first connecting portion 21 is located on the side of the top cover plate 10 away from the electrode assembly 300, and at least a portion of the second connecting portion 22 passes through the first through hole 101 of the top cover plate 10 and is used to connect with the electrode tab.

[0059] It is understood that in some other embodiments, the number of second connecting portions 22 of the electrode post 20 may be two, but not limited to two; it may also be three, four, or more. The number of second connecting portions 22 may correspond to the number of electrode assemblies within the housing 200, so that each second connecting portion 22 is connected to a set of electrode tabs. The number of first connecting portions 21 is related to the number of second connecting portions 22. A first connecting portion 21 is provided between two adjacent second connecting portions 22. For example, when the number of second connecting portions 22 is 2, the number of first connecting portions 21 is 1. When the number of second connecting portions 22 is 3, the number of first connecting portions 21 is 2. When the number of second connecting portions 22 is 4, the number of first connecting portions 21 is 3, and so on. The second connecting portions 22 and the first connecting portions 21 are arranged alternately along the width direction of the top cover plate 10. For example, when the number of second connecting parts 22 is 3 and the number of first connecting parts 21 is 2, the pole post 20 includes a second connecting part 22, a first connecting part 21, a second connecting part 22, a first connecting part 21, and a second connecting part 22 connected in sequence along the width direction of the top cover plate 10.

[0060] When the number of electrode assemblies disposed within the housing 200 is N, the number of second connecting portions 22 is also set to N, where N is an integer greater than 1. The N second connecting portions 22 are spaced apart along the width direction of the top cover plate 10 and are connected to the first connecting portions 21. The N second connecting portions 22 pass through the first through hole 101 and are correspondingly connected to the tabs of each group of electrode assemblies.

[0061] The second connecting portion 22 in this embodiment can be directly welded to the tab 33. Therefore, at least a portion of the second connecting portion 22 passes through the first through hole 101 of the top cover plate 10 and extends into the housing 200 to be directly connected to the tab 33. No adapter plate structure is required, which reduces the use of parts, lowers the cost of the battery cell, and at the same time reduces the internal resistance of the battery cell and improves the energy density of the battery cell.

[0062] As one embodiment of pole post 20, such as Figure 13 As shown, the terminal post 20 may also include a transition portion 23, which connects the first connecting portion 21 and the second connecting portion 22 along the width direction of the top cover plate 10. By designing the transition portion 23, it can be used as a fuse. A fuse is a safety protection structure that, in the event of thermal runaway in a battery cell, melts preferentially over the first connecting portion 21 and the second connecting portion 22. This allows the circuit to be promptly disconnected via the transition portion 23 in the event of thermal runaway within the battery cell.

[0063] In order to ensure that the transition portion 23 disconnects from the first connection portion 21 and the second connection portion 22 in the event of thermal runaway of a battery cell, the length of the transition portion 23 is less than the length of the first connection portion 21 and less than the length of the second connection portion 22 along the length direction of the top cover plate 10, so that the flow area of ​​the transition portion 23 is less than the flow area of ​​the first connection portion 21 and less than the flow area of ​​the second connection portion 22.

[0064] As one embodiment of the top cover sheet 10, such as Figures 4 to 11 As shown, the top cover 10 is disposed over the opening of the housing 200. The top cover 10 can be made of a material with a certain hardness and strength (such as aluminum alloy or aluminum). In this way, the top cover 10 is not easily deformed when subjected to compression or impact, enabling the battery cell to have higher structural strength and improving safety performance. The material of the top cover 10 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0065] like Figure 9 As shown, the top cover plate 10 has at least two first through holes 101 and at least one second through hole 102 extending along its thickness direction. The first through holes 101 extend through the thickness direction of the top cover plate 10 to allow a portion of the structure of the electrode post 20 to pass through and connect with the tab 33 of the electrode assembly 300. At least two first through holes 101 are spaced apart along the width direction of the top cover plate 10, and at least one second through hole 102 is located between two adjacent first through holes 101. At least a portion of each second connecting portion 22 is correspondingly inserted into one first through hole 101 for connection with the tab. Therefore, when there are two second connecting portions 22, there can be two first through holes 101. In this case, the first connecting portion 21 is located on the side of the top cover plate 10 facing away from the electrode assembly 300, and there is a gap between the first connecting portion 21 and the top cover plate 10 for accommodating a portion of the first insulating member 30. Along the thickness direction of the top cover plate 10, the orthographic projection of the first connecting portion 21 covers all the second through holes 102. It can be understood that the second through holes 102 are located below the first connecting portion 21. Thus, during injection molding of the first insulating component 30, the support member 400 can pass through the second through holes 102 from the side of the top cover plate 10 away from the first connecting portion 21 of the pole post 20 to support the first connecting portion 21 of the pole post 20. During injection molding, the support member 400 fixes the relative position of the pole post 20 and the top cover plate 10, preventing the pole post 20 from shifting or deforming relative to the top cover plate 10. This ensures uniform filling thickness of the gap between the first connecting portion 21 of the pole post 20 and the top cover plate 10, as well as the stability and flatness of the pole post 20 installation, thereby improving the quality of the top cover assembly. It can be understood that the support member 400 is an auxiliary structural component used during injection molding of the first insulating component 30, and is removed after the first insulating component 30 is injection molded.

[0066] In some embodiments, such as Figure 5 , Figure 7 or Figure 9 As shown, a support portion 103 is provided between two adjacent first through holes 101 along the width direction of the top cover plate 10. The surface of the top cover plate 10 facing away from the electrode assembly 300 is higher than the surface of the support portion 103 facing the first connecting portion 21 of the electrode post 20. Therefore, there is a gap between the first connecting portion 21 of the electrode post 20 and the support portion 103. This gap is used to fill the first insulating portion 31 of the first insulating member 30. The support portion 103 supports the first insulating portion 31 and the first connecting portion 21. The second through hole 102 penetrates through the support portion 103. This allows the support member 400 to pass through the second through hole 102 on the support portion 103 to support the first connecting portion 21 during injection molding of the first insulating member 30.

[0067] In some embodiments, the first through hole 101 can be formed in the following manner: Please refer to Figure 10 Along the thickness direction of the top cover plate 10, a first groove 104 is provided on the side surface of the top cover plate 10 facing the first connecting portion 21. The first groove 104 is recessed from the side surface of the top cover plate 10 facing the pole post 20 toward the side surface of the top cover plate 10 away from the pole post 20. At least two first through holes 101 penetrate the bottom wall of the first groove 104 along the thickness direction of the top cover plate 10. That is, the hole wall of the first through hole 101 is not aligned with the groove wall of the first groove 104. At this time, along the width direction of the top cover plate 10, the bottom wall of the first groove 104 located between the two first through holes 101 serves as a support portion 103, which is used to support the first insulating portion 31 of the first insulating member 30 and the first connecting portion 21 of the pole post 20 below.

[0068] In some other embodiments, the first through hole 101 may also be formed in the following manner: Figure 11 As shown, along the thickness direction of the top cover plate 10, a through hole 105 is provided in the top cover plate 10. A support portion 103 is provided in the through hole 105. The two ends of the support portion 103, which are arranged opposite to each other along its longitudinal direction, are respectively connected to the two side walls of the through hole 105, which are arranged opposite to each other along the length direction of the top cover plate 10, and divide the through hole 105 into two first through holes 101 spaced apart along the width direction of the top cover plate 10. Along the thickness direction of the top cover plate 10, the surface of the top cover plate 10 near the first connecting portion 21 protrudes from the support portion 103. The support portion 103 is used to support the first insulating portion 31 of the first insulating member 30 and the first connecting portion 21 of the pole post 20 below.

[0069] In some embodiments, the shape of the second through hole 102 can be circular, triangular, rectangular, square, etc. The number of second through holes 102 can be one, two, three, or four. Multiple second through holes 102 are spaced apart. In some embodiments, to ensure that the support member 400 can more stably support the first connecting portion 21 after passing through the second through holes 102, all second through holes 102 are symmetrically arranged about the center line of the width direction of the top cover plate 10. This ensures that after the support member 400 is supported on the first connecting portion 21, the left and right sides of the first connecting portion 21 of the pole post 20 are balanced, avoiding the problem of uneven filling gap thickness between the first connecting portion 21 and the top cover plate 10.

[0070] In some embodiments, on a dummy plane perpendicular to the thickness direction of the top cover 10, the outer contour area of ​​the orthographic projection region of the support portion 103 is A, and the opening area of ​​the second through hole 102 is B, satisfying: 1%≤B / A≤30%. For example, within multiple intervals such as 1%≤B / A≤20%, 2%≤B / A≤30%, 3%≤B / A≤15%, or 4%≤B / A≤10%, specifically, B / A = 1%, 2%, 3%, 4%, 5%, 7%, 9%, 10%, 11%, 13%, 15%, 18%, 20%, 23%, 25%, 27%, 29%, or 30%, or any value between any two of the above. It is understandable that the outer contour of the orthographic projection area of ​​the support portion 103 can be rectangular. Along the width direction of the top cover plate 10, the long side of this outer contour is a straight line formed by the orthographic projections of the support portion 103 onto the two sides of the top cover plate 10 in the width direction, and the short side of this outer contour is a straight line formed by the orthographic projections of the support portion 103 onto the two sides of the top cover plate 10 in the length direction. This ensures the structural strength of the top cover plate 10, providing sufficient support in its thickness direction, while also preventing the opening area of ​​the second through hole 102 from being too small, thus avoiding an insufficiently small support surface for the support member 400 on the first connecting portion 21 of the pole post 20, which would affect the support effect. When B / A < 1%, the opening area of ​​the second through hole 102 on the top cover plate 10 is too small, the support area of ​​the support member 400 on the first connecting portion 21 of the pole post 20 is very small, the support effect is poor, and the pole post 20 may still deform and shift. When B / A > 30%, the opening area of ​​the top cover plate 10 will be very large, the remaining area of ​​the support part 103 of the pole post 20 will be very small, the structural strength will be poor, and the vertical force that the support part 103 of the pole post 20 can withstand will be reduced.

[0071] In some embodiments, such as Figure 9As shown, along the width direction of the top cover plate 10, the minimum distance between the wall of the second through hole 102 and the wall of the first through hole 101 is 'a', satisfying that a ≥ 2 mm. Specifically, a = 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 11 mm, 12 mm, 15 mm, etc. This ensures that the width of the support part 103 between the wall of the first through hole 101 and the wall of the second through hole 102 is not too small, preventing the support part 103 from easily deforming due to its small width at that point.

[0072] In other embodiments, to further improve the stability of the support 400 during the injection molding process, such as... Figure 12 , Figure 14 and Figure 15 As shown, the first connecting portion 21 has a second groove 201 on the side facing the top cover plate 10, and the second groove 201 is provided in a one-to-one correspondence with the second through hole 102. It can be understood that the central axis of the second groove 201 and the central axis of the second through hole 102 overlap, so that when the first insulating member 30 is injection molded, the end of the support member 400 can be inserted into the second groove 201 to limit the pole post 20, so that the support member 400 can be stably supported under the first connecting portion 21 and avoid displacement and deformation.

[0073] like Figure 14 As shown, along the thickness direction of the top cover plate 10, the depth of the second groove 201 is H1, and the thickness of the first connecting portion 21 is T1, satisfying: T1 > H1 ≥ 0.2 mm. For example, H1 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, etc. That is, the depth of the second groove 201 is less than the thickness of the first connecting portion 21 of the pole post 20, so that the first connecting portion 21 can provide sufficient stable support for the support member 400, while avoiding the first connecting portion 21 of the pole post 20 being too thin at the second groove 201 position, which would affect the current carrying capacity of the pole post 20. In some embodiments, H1 = b × T1, 0.2 ≤ b ≤ 0.9, for example, H1 = 0.2T1, H1 = 0.4T1, H1 = 0.6T1, H1 = 0.8T1, H1 = 0.9T1, etc. In some embodiments, T1 - H1 ≥ 0.5 mm. For example, T1-H1 = 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. This ensures that the thickness of the first connecting part 21 of the pole post 20 at the position of the second groove 201 is not too small, which would affect the current carrying capacity of the pole post 20. At the same time, the support member 400 can be stably supported in the second groove 201, and is not easy to tip over or detach from the second groove 201.

[0074] As one embodiment of the first insulating element 30, such as Figure 4 , Figure 5 , Figure 7As shown, the first insulating member 30 is fixedly connected to the pole post 20 and the top cover plate 10. The first insulating member 30 has a first insulating portion 31 disposed between the top cover plate 10 and the first connecting portion 21 for insulating the top cover plate 10 and the first connecting portion 21. The first insulating portion 31 has a third through hole 301 extending along its thickness direction, wherein the third through hole 301 and the second through hole 102 are provided in a one-to-one correspondence. It can be understood that the central axis of the second through hole 102 and the central axis of the third through hole 301 overlap. The third through hole 301 can be understood as a hole structure formed around the support member 400 during the injection molding of the first insulating member 30, with the support member 400 supporting the surface of the first connecting portion 21.

[0075] like Figure 4 As shown, the first insulating member 30 also includes a second insulating portion 32. Along the width direction of the top cover plate 10, the second insulating portion 32 is disposed on both sides of the first insulating portion 31. The second insulating portion 32 is disposed between the second connecting portion 22 of the pole post 20 and the top cover plate 10, and is used to insulate the top cover plate 10 and the second connecting portion 22. Exemplarily, the first insulating member 30 can be a plastic material, such as PP, PE, PPS, etc.

[0076] In some embodiments, the first insulating portion 31 and the second insulating portion 32 are integrally formed by injection molding.

[0077] In some embodiments, such as Figure 4 , Figure 5 , Figure 7 As shown, the top cover assembly 100 also includes a second insulating member 40, which is disposed on the surface of the top cover sheet 10 facing the interior of the housing 200. The second insulating member 40 is used to insulate the top cover sheet 10 and the electrode assembly 300 to reduce the risk of short circuits. Exemplarily, the second insulating member 40 can be a plastic material, such as PP, PE, or PPS. Specifically, the second insulating member 40 has a fourth through hole 401 corresponding to the first through hole 101. The fourth through hole 401 penetrates the thickness direction of the second insulating member 40, and the second connecting portion 22 passes through the first through hole 101 and the fourth through hole 401 in sequence, so that the second connecting portion 22 can be welded to the electrode tab.

[0078] In some embodiments, due to the presence of the second through hole 102 of the top cover plate 10 and the third through hole 301 of the first insulating portion 31, there is a risk of a short circuit between the top cover plate 10 and the first connecting portion 21 of the pole post 20. Therefore, as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the top cover assembly 100 also includes a third insulating member 50, which fills the second through hole 102 and the third through hole 301. Along the thickness direction of the top cover sheet 10, one end of the third insulating member 50 contacts the first connecting portion 21, and the other end of the third insulating member 50 contacts the second insulating member 40. In this way, the third insulating member 50 can fill the second through hole 102 and the third through hole 301 to avoid short circuit between the top cover sheet 10 and the electrode post 20, and achieve insulation between the top cover sheet 10 and the electrode post 20. At the same time, the third insulating member 50 can seal the hole walls of the second through hole 102 and the third through hole 301 to prevent electrolyte from entering and causing leakage. The third insulating member 50 can also prevent the first insulating portion 31 from being crushed when subjected to downward pressure.

[0079] It is understandable that when the first connecting part 21 is provided with the second groove 201, the third insulating member 50 fills the second through hole 102 and the third through hole 301 at the same time as filling the second groove 201.

[0080] Specifically, in some embodiments, such as Figure 7 and Figure 8 As shown, the third insulating element 50 can be a separate structural component. In some embodiments, the walls of the second through hole 102 and / or the third through hole 301 are provided with nanopores, and a portion of the third insulating element 50 is embedded within the nanopores. This enables the nano-injection molding of the third insulating element 50. During processing, insulating material can be directly inserted into the second through hole 102 and the third through hole 301 for filling; the insulating material is preferably a thermally conductive insulating material.

[0081] In some other embodiments, such as Figure 5 and Figure 6 As shown, the third insulating member 50 and the second insulating member 40 are integrally formed. That is, the third insulating member 50 can be directly disposed on the second insulating member 40. When installing the second insulating member 40, the third insulating member 50 can be directly inserted into the third through hole 301 and the second through hole 102, and the second through hole 102 and the third through hole 301 can be filled.

[0082] In some embodiments, the thermal conductivity of the third insulating member 50 is greater than that of the first insulating member 30. Since the third insulating member 50 fills the third through-hole 301 and the second through-hole 102 of the top cover plate 10, and one end of the third insulating member 50 can contact the first connecting portion 21, the third insulating member 50 can transfer the heat from the electrode post 20 to the top cover plate 10. Because the temperature sensing component on the battery pack or battery module is typically located on the top cover plate 10, the temperature detected by the temperature sensing component can be more accurate. Simultaneously, because there is a large indirect contact area between the first connecting portion 21 of the electrode post 20 and the top cover plate 10 in this application, compared to the prior art, the electrode post 20 of this application has superior thermal conductivity and can more efficiently conduct heat to the top cover plate 10; therefore, the temperature detected by the temperature sensing component is also more accurate.

[0083] This application also provides a method for processing a top cover assembly, such as... Figure 16 As shown, it includes the following steps: Step 1: Assemble the pole post 20 onto the top cover plate 10. Use the upper and lower molds to position and fix the pole post 20, so that at least a portion of each second connecting part 22 of the pole post 20 is inserted into a first through hole 101, and a gap is formed between the first connecting part 21 and the top cover plate 10.

[0084] Step 2: Using the support member 400, pass through the second through hole 102 from the side of the top cover plate 10 away from the first connecting part 21 of the pole post 20, so that the end of the support member 400 contacts the first connecting part 21 of the pole post 20; thereby using the support member 400 to support the first connecting part 21 of the pole post 20 and prevent the pole post 20 from shifting or deforming.

[0085] Step 3: Inject and mold the first insulating part 30 between the pole post 20 and the top cover plate 10, and fill the gap with the first insulating part 31 of the first insulating part 30, and form a third through hole 301 around the support member 400 on the first insulating part 31.

[0086] Step 4: After injection molding is complete, remove the support component 400.

[0087] After step four, step five may also be included: filling the second through hole 102 and the third through hole 301 with the third insulating element 50, and assembling the second insulating element 40 on the side of the top cover plate 10 away from the first insulating element 30.

[0088] It is understandable that the third insulating component 50 and the second insulating component 40 are pre-formed parts. When the third insulating component 50 is a separate component, it can be filled into the second through hole 102 and the third through hole 301 first, and then the second insulating component 40 can be assembled onto the surface of the top cover plate 10 opposite to the first insulating component 30. When the third insulating component 50 and the second insulating component 40 are integrally formed, the third insulating component 50 on the second insulating component 40 can be inserted into the second through hole 102 and the third through hole 301 respectively, and then the second insulating component 40 can be positioned and installed.

[0089] In some other embodiments, step five may also be: simultaneously injection molding a third insulating element 50 and a second insulating element 40 on the side of the top cover sheet 10 opposite to the first insulating element 30, with the third insulating element 50 filling the second through hole 102 and the third through hole 301. It is understood that the third insulating element 50 and the second insulating element 40 are fixed to the top cover sheet 10 by direct injection molding. During injection molding, some plastic material flows into the second through hole 102 and the third through hole 301, solidifying to form the third insulating element 50, while another portion of the plastic material flows to the side of the top cover sheet 10 opposite to the first insulating element 30, solidifying to form the second insulating element 40.

[0090] 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 cap assembly, characterized by, include: The top cover plate (10) has at least two first through holes (101) and at least one second through hole (102) extending through its thickness direction, wherein the at least two first through holes (101) are spaced apart along the width direction of the top cover plate (10), and at least one second through hole (102) is provided between two adjacent first through holes (101); The pole post (20) includes at least one first connecting part (21) and at least two second connecting parts (22), and each first connecting part (21) is connected to two adjacent second connecting parts (22). The first connecting part (21) is located on one side of the top cover plate (10) and is used to connect with an electrical connector. Along the thickness direction of the top cover plate (10), the orthographic projection of the first connecting part (21) covers all the second through holes (102). At least a portion of each second connecting part (22) is correspondingly inserted into one of the first through holes (101) for connection with the electrode tab. The first insulating member (30) is fixedly connected to the pole post (20) and the top cover plate (10). The first insulating member (30) has a first insulating part (31) disposed between the top cover plate (10) and the first connecting part (21). The first insulating part (31) has a third through hole (301) extending through its thickness direction. The third through hole (301) and the second through hole (102) are provided in a one-to-one correspondence.

2. The roof assembly of claim 1, wherein, Along the width direction of the top cover plate (10), a support portion (103) is provided between two adjacent first through holes (101). The support portion (103) supports the first insulating portion (31) and the first connecting portion (21). The second through hole (102) passes through the support portion (103).

3. The roof assembly of claim 2, wherein, Also includes: The second insulating element (40) is disposed on the side of the top cover plate (10) opposite to the first insulating element (30); The third insulating element (50) is filled in the second through hole (102) and the third through hole (301), and along the thickness direction of the top cover plate (10), one end of the third insulating element (50) is in contact with the first connecting part (21), and the other end of the third insulating element (50) is in contact with the second insulating element (40).

4. The roof assembly of claim 3, wherein, The wall of the second through hole (102) and / or the wall of the third through hole (301) are provided with nanopores, and part of the third insulating element (50) is embedded in the nanopores.

5. The roof assembly of claim 3, wherein, The third insulating element (50) and the second insulating element (40) are integrally formed.

6. The roof assembly of claim 3, wherein, The thermal conductivity of the third insulating element (50) is greater than that of the first insulating element (30).

7. A cap assembly according to any one of claims 2 to 6, wherein, On a fictitious plane perpendicular to the thickness direction of the top cover plate (10), the outer contour area of ​​the orthographic projection region of the support part (103) is A, and the opening area of ​​the second through hole (102) is B, satisfying: 1%≤B / A≤30%; and / or, Along the width direction of the top cover plate (10), the minimum distance between the wall of the second through hole (102) and the wall of the first through hole (101) is a, which satisfies: a≥2mm.

8. The roof assembly of any one of claims 1 to 6, wherein, The first connecting part (21) is provided with a second groove (201) on the side facing the top cover plate (10), and the second groove (201) is provided in a one-to-one correspondence with the second through hole (102).

9. The roof assembly of claim 8, wherein, Along the thickness direction of the top cover (10), the depth of the second groove (201) is H1, and the thickness of the first connecting part (21) is T1, satisfying: T1>H1≥0.2mm, or, H1=b×T1, 0.2≤b≤0.9, or, T1-H1≥0.5mm.

10. A battery cell characterized by, include: The housing (200) has an opening; An electrode assembly (300) having tabs (33) is housed within the housing (200); The top cover assembly (100) according to any one of claims 1-9 is disposed over the opening of the housing (200).

11. A battery, characterized by Includes the battery cell as described in claim 10.

12. An electrical device, characterized by This includes the battery cell as described in claim 10, or the battery as described in claim 11.

13. A method of processing a roof assembly, characterized by, The method for processing the top cover assembly according to any one of claims 1 to 9 includes the following steps: The pole post (20) is assembled onto the top cover plate (10) such that at least a portion of each second connection part (22) of the pole post (20) is correspondingly inserted into a first through hole (101) and a gap is formed between the first connection part (21) and the top cover plate (10); The support member (400) passes through the second through hole (102) from the side of the top cover plate (10) away from the first connecting part (21) of the pole post (20), so that the end of the support member (400) contacts the first connecting part (21) of the pole post (20). A first insulating member (30) is injection molded between the pole post (20) and the top cover plate (10), and the first insulating part (31) of the first insulating member (30) fills the gap, and a third through hole (301) is formed around the support member (400) on the first insulating part (31). After injection molding is completed, the support member (400) is removed.

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