Top cover assembly, battery monomer, battery and electric device

Abstract

The utility model provides a kind of top cover assembly, battery monomer, battery and electric device, it is related to battery technical field, the top cover assembly includes top cover sheet, pole, first insulating part and support piece, top cover sheet has the first through hole through its thickness direction;Pole includes at least one first connecting part and at least two second connecting parts, and each first connecting part is connected with adjacent two second connecting parts, first connecting part is located in one side of top cover sheet, for being connected with electric connecting piece, at least part of second connecting part is arranged in first through hole, for being connected with tab;First insulating part is fixedly connected pole and top cover sheet, first insulating part has the first insulating part between top cover sheet and first connecting part;Support piece is located in first insulating part, one end of support piece is in contact with top cover sheet, and the other end is in contact with first connecting part. Further can be fixed by support piece the relative position of pole and top cover sheet, so that pole is not prone to position deviation relative to top cover sheet.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover assembly, a battery cell, a battery, and an electrical device. Background Technology

[0002] An insulating component is typically installed between the terminal and the top cover plate of a battery cell. This 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 staff first positions the terminal above the top cover plate using tooling, and then uses 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. Utility Model Content

[0004] In view of this, the present invention aims to provide a top cover assembly, a battery cell, a battery, and an electrical device, in order to solve the technical problem that the electrode post is prone to displacement during the injection molding process of the insulating component in the prior art.

[0005] To achieve the objectives of this application, in a first aspect, this application provides a top cover assembly, including a top cover sheet, a pole, a first insulating member, and a support member. The top cover sheet has a first through hole extending through its thickness direction. The pole 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. At least a portion of the second connecting portion passes through the first through hole and is used to connect with a tab. The first insulating member fixes the pole and the top cover sheet together and has a first insulating portion disposed between the top cover sheet and the first connecting portion. The support member is disposed on the first insulating portion, with one end of the support member contacting the top cover sheet and the other end contacting the first connecting portion.

[0006] In one or more embodiments of this application, at least one of the top cover and the first connecting portion is provided with a first groove, and the support member extends into the first groove.

[0007] In one or more embodiments of this application, the edge of the end of the support member that extends into the first groove is provided with a rounded corner.

[0008] In one or more embodiments of this application, the top cover sheet is provided with a first groove, the depth of the first groove being H1 along the thickness direction of the top cover sheet, and the thickness of the top cover sheet being T1, satisfying: T1>H1≥0.2mm, or, H1=a×T1, 0.2≤a≤0.9, or, T1-H1≥0.5mm; and / or,

[0009] The first connecting part is provided with a first groove along the thickness direction of the top cover piece. The depth of the first groove is H2, and the thickness of the first connecting part is T2, satisfying: T2>H2≥0.2mm, or, H2=b×T2, 0.2≤b≤0.9, or, T2-H2≥0.5mm.

[0010] In one or more embodiments of this application, along the thickness direction of the top cover sheet, a second groove is provided on the side surface of the top cover sheet facing the first connecting portion. The second groove is formed by recessing from the side surface of the top cover sheet facing the first connecting portion toward the side surface of the top cover sheet away from the first connecting portion. The top cover sheet includes at least two first through holes, and at least a portion of each second connecting portion is correspondingly disposed in the first through hole. The at least two first through holes respectively penetrate the bottom wall of the second groove along the thickness direction of the top cover sheet.

[0011] Alternatively, along the thickness direction of the top cover sheet, a through hole is provided in the top cover sheet, and a support part is provided in the through hole. The two ends of the support part, which are arranged opposite to each other along its longitudinal direction, are respectively connected to the two side walls of the through hole, which are arranged opposite to each other along the length direction of the top cover sheet, and divide the through hole into two first through holes spaced apart along the width direction of the top cover sheet. Along the thickness direction of the top cover sheet, the side surface of the top cover sheet near the first connecting part protrudes from the support part.

[0012] In one or more embodiments of this application, the support member includes a first end that contacts the first connecting portion and a second end that contacts the top cover plate;

[0013] On a hypothetical plane perpendicular to the thickness direction of the top cover sheet, the projection of the first end falls within the projection range of the second end.

[0014] In one or more embodiments of this application, the cross-sectional area of ​​the support gradually increases along the direction from the first end to the second end.

[0015] In one or more embodiments of this application, the top cover assembly includes at least two support members.

[0016] In one or more embodiments of this application, at least two support members are symmetrically distributed along the length of the top cover plate.

[0017] In one or more embodiments of this application, the total contact area between at least two support members and the top cover plate is S1, where S1 ≥ 6m². 2 ; and / or,

[0018] The ratio of the length of the support member along the thickness direction of the top cover plate to the minimum cross-sectional area of ​​the support member is A, where 0.3 ≤ A ≤ 2; and / or,

[0019] The cross-section of the support is circular, and the diameter of the circle is B, where 0.3mm ≤ B ≤ 10mm.

[0020] In one or more embodiments of this application, the strength of the support member is greater than the strength of the top cover plate; and / or,

[0021] The strength of the support member is greater than the strength of the first connection; and / or,

[0022] The strength of the support is C, where C > 140 MPa.

[0023] Secondly, this application provides a battery cell, comprising: a housing, an electrode assembly, and a top cover assembly as described in any one of the first aspects, 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.

[0024] Thirdly, this application provides a battery, including the battery cell described in the second aspect.

[0025] Fourthly, this application provides an electrical device, including the battery cell described in the second aspect, or the battery described in the third aspect.

[0026] 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:

[0027] The top cover assembly provided in this application embodiment has a support member provided between the top cover plate and the first connecting part of the pole post. One end of the support member contacts the top cover plate and the other end contacts the first connecting part. The support member can fix the relative position of the pole post and the top cover plate. As a result, during the injection molding of the first insulating part, the pole post is less likely to shift or deform relative to the top cover plate. This ensures that the filling thickness of the first insulating part between the pole post and the top cover plate is uniform, as well as the stability and flatness of the pole post installation, thereby improving the quality of the top cover assembly. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of a battery cell provided in an embodiment of this application.

[0029] Figure 2 This is a top view of the top cover assembly provided in an embodiment of this application.

[0030] Figure 3 yes Figure 2 BB cross-section diagram.

[0031] Figure 4This is an exploded structural diagram of a top cover assembly provided in one embodiment of this application.

[0032] Figure 5 This is a three-dimensional structural diagram of the pole post in the top cover assembly provided in the embodiments of this application.

[0033] Figure 6 This is a three-dimensional structural diagram of the top cover sheet in a top cover assembly provided in one embodiment of this application.

[0034] Figure 7 This is a partial longitudinal cross-sectional structural diagram of the top cover assembly provided in the embodiments of this application.

[0035] Figure 8 This is a partial three-dimensional structural diagram of the top cover sheet in a top cover assembly provided in another embodiment of this application.

[0036] Figure 9 This is an exploded structural diagram of the top cover assembly provided in another embodiment of this application.

[0037] Figure 10 This is an exploded structural diagram of the top cover assembly provided in another embodiment of this application.

[0038] Figure 11 This is a three-dimensional structural diagram of the first insulating element in the top cover assembly provided in the embodiments of this application.

[0039] In the figure: 100-Top cover assembly; 200-Housing; 1-Top cover piece; 2-Position post; 3-First insulating component; 4-Support component; 5-First groove; 6-Second insulating component; 11-First through hole; 12-Second groove; 13-Through hole; 14-Support part; 21-First connecting part; 22-Second connecting part; 23-Transition part; 31-First insulating part; 32-Second insulating part; 41-First end; 42-Second end; 61-Third through hole; 311-Second through hole. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] 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 positive 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 the space between the first connecting portion 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.

[0042] 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 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 as an example. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle, and the battery can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle 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. The battery can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0045] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. These battery cells can be electrically connected in series, parallel, or a combination of both, and communicate with the battery management system, which controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module, and then these battery modules can be electrically connected in series, parallel, or a combination of both, together with the battery management system to form a battery pack.

[0046] Multiple battery cells can be mounted on supporting structures such as housings, frames, and brackets. Electrical connections between battery cells and between battery cells and the battery management system can be established via electrical connectors, which can be busbars. Alternatively, battery cells can be electrically connected by plugging in 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, battery cells and the battery management system can also be electrically connected by plugging in each other, which will not be elaborated further here.

[0047] 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.

[0048] A battery cell refers to the smallest unit that makes up a battery. As one embodiment of a battery cell, please refer to... Figure 1The battery cell includes a housing 200, an electrode assembly, 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. 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.

[0049] As one embodiment of an electrode assembly, the electrode assembly 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. The electrode assembly 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, positioned 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.

[0050] 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.

[0051] Before the electrode assembly is installed into the housing 200, the electrode tabs of the electrode assembly are usually assembled with the top cover assembly 100. For example, the electrode post 2 of the top cover assembly 100 is welded to the electrode tabs of the electrode assembly, and then the electrode assembly is installed into the housing 200.

[0052] The structure of the top cover assembly 100 is described below.

[0053] Please refer to the following: Figure 2 , Figure 3 , Figure 4 , Figure 9 or Figure 10 The top cover assembly provided in this application embodiment includes a top cover sheet 1, an electrode post 2, a first insulating member 3, and a support member 4.

[0054] The top cover 1 is positioned over the opening of the housing 200. The top cover 1 can be made of a material with a certain degree of hardness and strength (such as aluminum alloy or aluminum), thus preventing deformation under pressure or impact, allowing the battery cell to possess higher structural strength and improving safety performance. The top cover 1 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic; this application does not impose any special limitations on this. Figure 6 As shown, the top cover plate 1 has a first through hole 11 extending through its thickness direction. The first through hole 11 extends through the thickness direction of the top cover plate 1 to allow a portion of the structure of the electrode post 2 to pass through and connect with the tab of the electrode assembly.

[0055] In some embodiments, the first through hole 11 can be formed in the following manner: Please refer to Figure 8 Along the thickness direction of the top cover plate 1, a second groove 12 is provided on the side surface of the top cover plate 1 facing the first connecting portion 21. The second groove 12 is recessed from the side surface of the top cover plate 1 facing the first connecting portion 21 toward the side surface of the top cover plate 1 away from the first connecting portion 21. The top cover plate 1 includes at least two first through holes 11, and at least a portion of each second connecting portion 22 is correspondingly inserted into the first through hole 11. The at least two first through holes 11 respectively penetrate the bottom wall of the groove of the second groove 12 along the thickness direction of the top cover plate 1. That is, the hole wall of the first through hole 11 is not aligned with the groove wall of the second groove 12. The bottom wall of the second groove 12 is used to support the lower part of the first connecting portion 21 of the first insulating member 3 and the pole post 2.

[0056] In some other embodiments, the first through hole 11 can also be formed in the following manner: Figure 6As shown, a through hole 13 is provided in the top cover plate 1 along its thickness direction. A support portion 14 is provided inside the through hole 13. The two ends of the support portion 14, which are arranged opposite to each other along its longitudinal direction, are respectively connected to the two side walls of the through hole 13, which are arranged opposite to each other along the length direction of the top cover plate 1, and divide the through hole 13 into two first through holes 11 spaced apart along the width direction of the top cover plate 1. Along the thickness direction of the top cover plate 1, the surface of the top cover plate 1 near the first connecting portion 21 protrudes from the support portion 14. The support portion 14 is used to support the first connecting portion 21 of the first insulating member 3 and the pole post 2.

[0057] As one embodiment of pole post 2, such as Figure 4 As shown, the terminal 2 is disposed on the top cover plate 1 and is used to connect with the tab. The terminal 2 can be electrically connected to the electrode assembly to output or input electrical energy of the battery cell. The terminal 2 includes a positive terminal and a negative terminal. The positive terminal is used to connect to the positive 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 negative terminal is used to connect to the negative tab, thereby introducing the negative 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.

[0058] It should be noted that the "terminal 2" mentioned in this application can be either a positive terminal or a negative terminal (unless otherwise specified). The "tab" mentioned in this application can be either a positive tab 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.

[0059] like Figure 4 and Figure 5 As shown, the pole post 2 includes at least one first connecting portion 21 and at least two second connecting portions 22, and each first connecting portion 21 is connected to two adjacent 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 1. The first connecting portion 21 is located on one side of the top cover plate 1 and is used to connect with an electrical connector. At least a portion of the second connecting portion 22 passes through the first through hole 11 and is used to connect with a tab. In some embodiments, the orthographic projection of the second connecting portion 22 of the pole post 2 falls within the first through hole 11 along the thickness direction of the top cover plate 1. It can be understood that the orthographic projection of the second connecting portion 22 along the thickness direction of the top cover plate 1 does not overlap with the top cover plate 1, but falls completely within the first through hole 11, thereby reducing the size occupied by the pole post 2 in the width direction of the top cover plate 1.

[0060] It is understood that in some other embodiments, the number of second connecting portions 22 of the pole post 2 may be two, but is 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.

[0061] When the number of electrode assemblies disposed within the housing 200 is N, the number of second connecting parts 22 is also set to N, where N is an integer greater than 1. The N second connecting parts 22 are spaced apart along the width direction of the top cover plate 1 and are connected to the first connecting parts 21. The N second connecting parts 22 pass through the first through hole 11 and are correspondingly connected to the tabs of each group of electrode assemblies.

[0062] The second connecting portion 22 in this embodiment can be directly welded to the electrode tab. Therefore, at least a portion of the second connecting portion 22 passes through the first through hole 11 and extends into the housing 200 to be directly connected to the electrode tab. No adapter plate structure is required, which reduces the use of components, 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.

[0063] As one embodiment of pole post 2, such as Figure 4 As shown, the terminal post 2 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 1. 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.

[0064] 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 1, 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.

[0065] In some embodiments, at least a portion of the orthographic projection of the transition portion 23 falls within the first through hole 11 along the thickness direction of the top cover plate 1. It is understood that the orthographic projection of the transition portion 23 in the thickness direction of the top cover plate 1 may fall partially or entirely within the first through hole 11, thereby reducing the space occupied by the transition portion 23 in the width direction of the top cover plate 1.

[0066] As one embodiment of the first insulating element 3, such as Figure 4 , Figure 9 or Figure 10As shown, the first insulating component 3 is fixedly connected to the pole post 2 and the top cover plate 1, as follows. Figure 11 As shown, the first insulating member 3 has a first insulating portion 31 disposed between the top cover plate 1 and the first connecting portion 21, for insulating the top cover plate 1 and the first connecting portion 21. The first insulating portion 31 is provided with a second through hole 311 through which the support member 4 passes. The support member 4 passes through the second through hole 311, with one end contacting the top cover plate 1 and the other end contacting the first connecting portion 21. Figure 11 As shown, the first insulating member 3 also includes a second insulating portion 32. Along the width direction of the top cover plate 1, 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 2 and the top cover plate 1, and is used to insulate the top cover plate 1 and the second connecting portion 22. Exemplarily, the first insulating member 3 can be a plastic material, such as PP, PE, PPS, etc.

[0067] In some embodiments, the first insulating portion 31 and the second insulating portion 32 are integrally formed by injection molding.

[0068] As one embodiment of support member 4, such as Figure 5 As shown, the support member 4 is disposed in the first insulating part 31. One end of the support member 4 contacts the top cover plate 1, and the other end contacts the first connecting part 21. It can be understood that the support member 4 penetrates the first insulating part 31 along the thickness direction of the top cover plate 1. One end of the support member 4 contacts and connects to the top cover plate 1, and the other end contacts and connects to the first connecting part 21. In this way, during the injection molding process of the first insulating part 3, the relative position of the pole post 2 and the top cover plate 1 can be fixed by the support member 4, so that the pole post 2 is not prone to positional displacement relative to the top cover plate 1, ensuring uniform filling thickness of the first insulating part 31 between the pole post 2 and the top cover plate 1, as well as the stability and flatness of the pole post 2 installation, thereby improving the quality of the top cover assembly.

[0069] In some embodiments, at least one of the top cover plate 1 and the first connecting portion 21 is provided with a first groove 5, and the support member 4 extends into the first groove 5. It is understood that the first groove 5 can be provided on the surface of the top cover plate 1 facing the first connecting portion 21, or on the surface of the first connecting portion 21 facing the top cover plate 1, or simultaneously on the surfaces of the top cover plate 1 and the first connecting portion 21. The first groove 5 is a concave structure formed within the surface of the top cover plate 1 or the surface of the first connecting portion 21, used to allow the end of the support member 4 to be inserted, thereby enabling the pole post 2 to be positioned relative to the top cover plate 1 through the support member 4, preventing displacement and deformation during the injection molding of the first insulating member 3. When the surface of the top cover plate 1 facing the first connecting portion 21 is provided with the first groove 5, in some embodiments, please refer to... Figure 8 The first groove 5 is specifically formed on the bottom wall of the second groove 12. In some embodiments, please refer to... Figure 6The first groove 5 is specifically formed in the support portion 14.

[0070] In some embodiments, such as Figure 7 and Figure 8 As shown, the top cover 1 has a first groove 5. Along the thickness direction of the top cover 1, the depth of the first groove 5 is H1, and the thickness of the top cover 1 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 first groove 5 is less than the thickness of the top cover 1, so that the top cover 1 can provide sufficient stable support for the support member 4, while avoiding the top cover 1 being too thin at the position of the first groove 5, which would affect the structural strength of the top cover 1. In some embodiments, H1 = a × T1, 0.2 ≤ a ≤ 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 = 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc. This ensures that the thickness of the top cover 1 at the position of the first groove 5 is not too small, which would affect the structural strength of the top cover 1, while the support member 4 can be stably supported in the first groove 5 and is not easy to tip over.

[0071] In some embodiments, such as Figure 5 and Figure 7 As shown, the first connecting portion 21 is provided with a first groove 5. Along the thickness direction of the top cover plate 1, the depth of the first groove 5 is H2, and the thickness of the first connecting portion 21 is T2, satisfying: T2 > H2 ≥ 0.2 mm. For example, H2 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, etc. That is, the depth of the first groove 5 is less than the thickness of the first connecting portion 21 of the pole post 2, so that the first connecting portion 21 can provide sufficient stable support for the support member 4, while avoiding the first connecting portion 21 of the pole post 2 being too thin at the position of the first groove 5, thus affecting the current-carrying capacity of the pole post 2. In some embodiments, H2 = b × T2, 0.2 ≤ b ≤ 0.9, for example, H2 = 0.2T2, H2 = 0.4T2, H2 = 0.6T2, H2 = 0.8T2, H2 = 0.9T2, etc. In some embodiments, T2 - H2 ≥ 0.5 mm. For example, T2-H2 = 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. This ensures that the thickness of the first connecting part 21 of the pole post 2 at the position of the first groove 5 is not too small, which would affect the current carrying capacity of the pole post 2. At the same time, the support member 4 can be stably supported in the first groove 5, and is not easy to tip over or detach from the first groove 5.

[0072] In some embodiments, the support member 4 may be a cylindrical, cuboid, elliptical, or other structure with planar structures at both ends along its length.

[0073] In some embodiments, the edge of the end of the support member 4 that extends into the first groove 5 is rounded. It is understood that the edge of the end of the support member 4 that is inserted into the first groove 5 is formed as a rounded transition surface, so that the end of the support member 4 can be more easily inserted into the first groove 5. In other embodiments, a rounded edge may also be provided at the opening edge of the first groove 5, so that the end of the support member 4 can be more easily inserted into the first groove 5. In some embodiments, along the thickness direction of the top cover plate 1, the height of the rounded corner of the support member 4 or the height of the rounded corner at the opening of the first groove 5 is less than the depth of the first groove 5, so that there is a contact area between the vertical edge of the support member 4 and the vertical groove wall of the first groove 5, preventing the support member 4 from wobbling within the first groove 5.

[0074] In some embodiments, such as Figure 7 As shown, the support member 4 includes a first end 41 that contacts the first connecting portion 21 and a second end 42 that contacts the top cover plate 1. On a virtual plane perpendicular to the thickness direction of the top cover plate 1, the projection of the first end 41 falls within the projection range of the second end 42. That is, the cross-sectional area of ​​the first end 41 is smaller than the cross-sectional area of ​​the second end 42, thereby making the center of gravity of the support member 4 closer to the top cover plate 1, making it less prone to tipping over. In some embodiments, the cross-sectional area of ​​the support member 4 gradually increases along the direction from the first end 41 to the second end 42, making the center of gravity of the support member 4 closer to the top cover plate 1, making it less prone to tipping over. Of course, in some other embodiments, the cross-sectional area of ​​the support member 4 may be consistent from the first end 41 to the second end 42, making its upper and lower structures consistent, so as to facilitate processing.

[0075] like Figure 4 , Figure 9 and Figure 10 As shown, the top cover assembly includes at least two support members 4. For example, it can be as follows: Figure 4 Two examples from the illustrated embodiment, such as Figure 9 The three or as shown in the embodiments Figure 10 In the illustrated embodiment, there are four supports. At least two supports 4 are symmetrically distributed along the length of the top cover plate 1. This allows the supports 4 to provide more stable support between the top cover plate 1 and the first connection portion 21 of the pole post 2, preventing the pole post 2 from shifting or deforming.

[0076] In some embodiments, the total contact area between at least two support members 4 and the top cover plate 1 is S1, where S1 ≥ 6m². 2 For example, S1 can be 6m 2 7m 2 8m 2 9m 2 10m 2etc. So that the support member 4 can have sufficient contact area with the top cover plate 1, so that the support member 4 can be stably supported on the top cover plate 1.

[0077] In some embodiments, the ratio of the length of the support member 4 along the thickness direction of the top cover plate 1 to the minimum cross-sectional area of ​​the support member 4 is A, where 0.3 ≤ A ≤ 2; for example, A can be 0.3, 0.5, 0.7, 0.8, 1.2, 1.5, 1.8, 2, etc. This arrangement ensures that the ratio of the length of the support member 4 to the minimum cross-sectional area is relatively small, so that the support member 4 has sufficient supporting force and is not easily crushed when subjected to compression.

[0078] In some embodiments, the cross-section of the support member 4 is circular, and the diameter of the circle is B, where 0.3mm ≤ B ≤ 10mm. For example, B can be 0.3mm, 0.8mm, 1mm, 1.2mm, 1.7mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. This configuration ensures that the support member 4 has sufficient supporting force, allowing it to be more stably supported between the first connecting portion 21 of the pole post 2 and the top cover plate 1, and preventing it from being crushed under pressure.

[0079] In some embodiments, the material of the support member 4 may be ceramic, quartz, mica, or other materials with insulation and high strength. The strength of the support member 4 is greater than the strength of the top cover plate 1, and the strength of the support member 4 is greater than the strength of the first connecting portion 21. The strength of the support member 4 is C, where C > 140 MPa. This ensures that the support member 4 has sufficient structural strength to better support between the first connecting portion 21 and the top cover plate 1, and is not easily crushed.

[0080] In some embodiments, the thermal conductivity of the support member 4 is greater than that of the first insulating member 3. Since the support member 4 is supported between the first connecting portion 21 of the pole post 2 and the top cover plate 1, the support member 4 can transfer the heat of the pole post 2 to the top cover plate 1. Since the temperature acquisition component on the battery pack or battery module is usually located on the top cover plate 1, the temperature detected by the temperature acquisition component can be more accurate.

[0081] As one embodiment of the top cover assembly 100, such as Figure 4 , Figure 9 and Figure 10 As shown, the top cover assembly 100 also includes a second insulating member 6, which is disposed on the surface of the top cover sheet 1 facing the interior of the housing 200, for insulating the top cover sheet 1 and the electrode assembly to reduce the risk of short circuit; for example, the second insulating member 6 can be a plastic material, such as PP, PE, PPS, etc.

[0082] Specifically, the second insulating member 6 is provided with a third through hole 61 corresponding to the first through hole 11. The third through hole 61 penetrates the thickness direction of the second insulating member 6. The second connecting part 22 passes through the first through hole 11 and the third through hole 61 in sequence so that the second connecting part 22 can be welded to the electrode tab.

[0083] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A top cover assembly, characterized in that, include: The top cover plate (1) has a first through hole (11) extending through it along its thickness direction; The pole post (2) 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 (1) and is used to connect with an electrical connector. At least a portion of the second connecting part (22) passes through the first through hole (11) and is used to connect with a tab. The first insulating member (3) is fixedly connected to the pole post (2) and the top cover plate (1). The first insulating member (3) has a first insulating part (31) disposed between the top cover plate (1) and the first connecting part (21). A support member (4) is provided on the first insulating part (31). One end of the support member (4) is in contact with the top cover plate (1), and the other end is in contact with the first connecting part (21).

2. The top cover assembly as claimed in claim 1, characterized in that, At least one of the top cover plate (1) and the first connecting portion (21) is provided with a first groove (5), and the support member (4) extends into the first groove (5).

3. The top cover assembly as described in claim 2, characterized in that, The edge of the support member (4) extending into the first groove (5) is rounded.

4. The top cover assembly as claimed in claim 2, characterized in that, The top cover plate (1) is provided with the first groove (5). Along the thickness direction of the top cover plate (1), the depth of the first groove (5) is H1, and the thickness of the top cover plate (1) is T1, satisfying: T1>H1≥0.2mm, or, H1=a×T1, 0.2≤a≤0.9, or, T1-H1≥0.5mm; and / or, The first connecting part (21) is provided with the first groove (5). Along the thickness direction of the top cover (1), the depth of the first groove (5) is H2, and the thickness of the first connecting part (21) is T2, satisfying: T2>H2≥0.2mm, or, H2=b×T2, 0.2≤b≤0.9, or, T2-H2≥0.5mm.

5. The top cover assembly as claimed in claim 1, characterized in that, Along the thickness direction of the top cover plate (1), a second groove (12) is provided on the side surface of the top cover plate (1) facing the first connecting part (21). The second groove (12) is recessed from the side surface of the top cover plate (1) facing the first connecting part (21) toward the side surface of the top cover plate (1) away from the first connecting part (21). The top cover plate (1) includes at least two first through holes (11). At least a portion of each second connecting part (22) is correspondingly inserted into the first through hole (11). The at least two first through holes (11) respectively penetrate the bottom wall of the groove (12) along the thickness direction of the top cover plate (1). Alternatively, along the thickness direction of the top cover plate (1), the top cover plate (1) is provided with a through hole (13), and a support part (14) is provided in the through hole (13). The two ends of the support part (14) arranged opposite to each other along its longitudinal direction are respectively connected to the two side walls of the through hole (13) arranged opposite to each other along the length direction of the top cover plate (1), and the through hole (13) is divided into two first through holes (11) spaced apart along the width direction of the top cover plate (1). Along the thickness direction of the top cover plate (1), the side surface of the top cover plate (1) near the first connecting part (21) protrudes from the support part (14).

6. The top cover assembly as described in any one of claims 1-5, characterized in that, The support member (4) includes a first end (41) that contacts the first connecting part (21) and a second end (42) that contacts the top cover plate (1); On a dummy plane perpendicular to the thickness direction of the top cover (1), the projection of the first end (41) falls within the projection range of the second end (42).

7. The top cover assembly as claimed in claim 6, characterized in that, Along the direction from the first end (41) to the second end (42), the cross-sectional area of ​​the support member (4) gradually increases.

8. The top cover assembly as described in any one of claims 1-5, characterized in that, The top cover assembly includes at least two support members (4).

9. The top cover assembly as claimed in claim 8, characterized in that, At least two of the support members (4) are symmetrically distributed along the length of the top cover plate (1).

10. The top cover assembly as claimed in claim 8, characterized in that, The total contact area between at least two of the support members (4) and the top cover plate (1) is S1, where S1 ≥ 6m². 2 ; and / or, The ratio of the length of the support member (4) along the thickness direction of the top cover plate (1) to the minimum cross-sectional area of ​​the support member (4) is A, 0.3≤A≤2; and / or, The cross-section of the support member (4) is circular, and the diameter of the circle is B, 0.3mm≤B≤10mm.

11. The top cover assembly as claimed in any one of claims 1-5, characterized in that, The strength of the support member (4) is greater than the strength of the top cover plate (1); and / or, The strength of the support member (4) is greater than the strength of the first connecting part (21); and / or, The strength of the support member (4) is C, where C > 140 MPa.

12. A single battery cell, characterized in that, include: The shell has an opening; An electrode assembly having tabs is housed within the housing; The top cover assembly according to any one of claims 1-11 is disposed over the opening of the housing.

13. A battery, characterized in that, Includes the battery cell as described in claim 12.

14. An electrical appliance, characterized in that, This includes the battery cell as described in claim 12, or the battery as described in claim 13.

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