Pole and processing method thereof, top cover assembly, battery monomer, battery and power utilization device

Abstract

The invention provides a pole and a processing method thereof, a top cover assembly, a battery monomer, a battery and a power utilization device, and relates to the technical field of batteries, the pole comprises at least one first connecting part, at least two second connecting parts and a transition part, the first connecting part is used for being connected with an electric connecting piece; the second connecting parts are used for being connected with tabs, each first connecting part is arranged between every two adjacent second connecting parts and connected with every two adjacent second connecting parts, the transition parts are connected between the first connecting parts and the second connecting parts in the first direction, and the length of the transition parts is smaller than that of the first connecting parts in the third direction; the length of the first connecting part is smaller than that of the second connecting part, so that the occupied size of the pole in the width direction can be reduced, and more space is reserved for the welding surface width of the first connecting part and the welding surface width of the second connecting part, so that the total size of the pole in the width direction is reduced, and the pole can be suitable for a battery monomer with limited design space of the top cover assembly.

Description

Technical Field

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

[0002] In battery structure design, terminals are typically used to connect the tabs of the electrode assembly to external electrical connectors to allow current to flow in or out of the electrode assembly. Therefore, the current-carrying capacity of the terminals affects the battery's charge / discharge capability and safety performance. In related technologies, in battery cells consisting of a top cover assembly, electrode assembly, and casing, the limited width design space of the top cover assembly for relatively thin battery cells restricts the design dimensions of the terminals, resulting in weaker current-carrying capacity and hindering improvements in battery charge / discharge performance and safety. Summary of the Invention

[0003] The purpose of this application is to provide a terminal post and its processing method, a top cover assembly, a battery cell, a battery, and an electrical device to solve the technical problem that the terminal post in the prior art is too wide and not suitable for battery cells with a small thickness.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, this application provides a pole post, comprising: at least one first connecting portion, at least two second connecting portions, and a transition portion, wherein the at least one first connecting portion is used to connect to an electrical connector; the at least two second connecting portions are used to connect to a tab, wherein each first connecting portion is disposed between and connected to two adjacent second connecting portions, and the at least two second connecting portions are spaced apart along a first direction; the transition portion is connected between the first connecting portion and the second connecting portion along a third direction, and the length of the transition portion is less than the length of the first connecting portion and less than the length of the second connecting portion, wherein the first direction and the third direction intersect.

[0006] In one or more embodiments of this application, the transition portion includes a first end and a second end disposed opposite to each other along its longitudinal direction. Along the second direction, the second connecting portion has a first end face disposed close to the first connecting portion. The first end is connected to the first end face, and the second end is connected to the side wall surface of the first connecting portion along the first direction. The first direction, the second direction, and the third direction intersect each other.

[0007] In one or more embodiments of this application, the transition portion includes a first connecting segment and a second connecting segment, the first end being the end of the first connecting segment that is away from the second connecting segment, the first connecting segment extending along a second direction, and the second end being the end of the second connecting segment that is away from the first connecting segment, the second connecting segment extending along a first direction.

[0008] In one or more embodiments of this application, the transition portion further includes a third connecting segment, which connects the first connecting segment and the second connecting segment, and the third connecting segment is arc-shaped.

[0009] In one or more embodiments of this application, along a first direction, the side wall surface of the first connecting segment near the first connecting portion and the side wall surface of the second connecting portion near the first connecting portion are on the same plane.

[0010] In one or more embodiments of this application, along a second direction, the second connecting segment has a first surface and a second surface disposed opposite to each other, the first surface and the second surface being parallel; and / or,

[0011] Along the second direction, the first connecting portion has a second end face disposed near the second connecting portion, wherein the first face and the second end face are on the same plane.

[0012] In one or more embodiments of this application, the transition portion includes a first end and a second end disposed opposite to each other along its longitudinal direction, the first end being connected to the side wall surface of the second connecting portion along a first direction, and the second end being connected to the side wall surface of the first connecting portion along a first direction.

[0013] In one or more embodiments of this application, the transition portion includes a first connecting segment, a second connecting segment, and a fourth connecting segment. The fourth connecting segment connects between the first connecting segment and the second connecting segment. The first end is the end of the first connecting segment that is away from the fourth connecting segment. The first connecting segment extends along a first direction. The second end is the end of the second connecting segment that is away from the fourth connecting segment. The second connecting segment extends along the first direction. The fourth connecting segment extends along a second direction. The first direction, the second direction, and the third direction intersect each other.

[0014] In one or more embodiments of this application, the transition portion further includes a third connecting segment and a fifth connecting segment. The third connecting segment is connected between the first connecting segment and the fourth connecting segment, and the fifth connecting segment is connected between the second connecting segment and the fourth connecting segment. Both the third connecting segment and the fifth connecting segment are arc-shaped.

[0015] In one or more embodiments of this application, along the second direction, the side wall surface of the first connecting segment near the first connecting portion is in the same plane as the first end face of the second connecting portion; and / or,

[0016] Along the second direction, the first connecting portion has a second end face disposed near the second connecting portion, and the side wall surface of the second connecting segment near the second connecting portion is in the same plane as the second end face.

[0017] In one or more embodiments of this application, along a first direction, the fourth connecting segment has a third surface and a fourth surface that are disposed opposite to each other and are parallel to each other.

[0018] In one or more embodiments of this application, along the first direction, the distance between the third and fourth surfaces is c, satisfying: 0.8mm ≤ c ≤ 3mm; and / or,

[0019] Along the first direction, the distance between the third and fourth surfaces is c, and the minimum distance between the sidewall of the first connecting part and the sidewall of the second connecting part is a, satisfying: 65% ≤ c / a ≤ 95%.

[0020] In one or more embodiments of this application, along the thickness direction of the third connecting segment, the third connecting segment has a first arc surface and a second arc surface disposed opposite to each other, and the arc radius of the first arc surface is greater than the arc radius of the second arc surface;

[0021] Along the thickness direction of the fifth connecting segment, the fifth connecting segment has a third arc surface and a fourth arc surface that are arranged opposite to each other, and the radius of the arc of the third arc surface is smaller than the radius of the arc of the fourth arc surface. The first arc surface and the third arc surface are located on the same side of the thickness direction of the transition section, and the second arc surface and the fourth arc surface are located on the same side of the thickness direction of the transition section.

[0022] In one or more embodiments of this application, the sidewall of the second connecting portion forms a second outer peripheral surface, the second outer peripheral surface is disposed around the first end face, and the second outer peripheral surface extends in a direction perpendicular to the first end face; and / or,

[0023] Along the second direction, the first connecting portion has a second end face disposed near the second connecting portion, the sidewall of the first connecting portion forms a first outer peripheral surface, the first outer peripheral surface is disposed around the second end face, and the first outer peripheral surface extends in a direction perpendicular to the second end face; and / or, the first connecting portion is flat, and / or, the second connecting portion is flat.

[0024] In one or more embodiments of this application, along the second direction, the first connecting portion has a second end face and a first electrical connection face disposed opposite to each other, the second end face is disposed close to the second connecting portion, and the first electrical connection face is connected to an electrical connector; along the second direction, the second connecting portion has a first end face disposed close to the first connecting portion, the second end face is closer to the first electrical connection face than the first end face, wherein the first direction, the second direction and the third direction intersect each other.

[0025] In one or more embodiments of this application, along the second direction, the distance between the second end face and the first end face is h3, satisfying: 0.1mm ≤ h3 ≤ 1.2mm; and / or,

[0026] Along the second direction (Y), the distance between the second end face and the first end face is h3, and the total height of the pole post is h4, satisfying: 1% ≤ h3 / h4 ≤ 20%.

[0027] In one or more embodiments of this application, along the first direction, the minimum distance between the sidewall of the first connecting portion and the sidewall of the second connecting portion is a, which satisfies: 1mm≤a≤3mm.

[0028] In one or more embodiments of this application, along the second direction, the thickness of the second connecting portion is h1, and the thickness of the first connecting portion is h2, satisfying: h1 ≥ h2; and / or,

[0029] The thickness h1 of the second connecting part satisfies: 1mm ≤ h1 ≤ 8mm; and / or,

[0030] The thickness h2 of the first connecting part satisfies: 1mm ≤ h2 ≤ 8mm; and / or,

[0031] The thickness h1 of the second connecting part and the thickness h2 of the first connecting part satisfy: 40% ≤ h2 / h1 ≤ 100%; and / or,

[0032] Along the first direction, the maximum width of the first connecting portion is W1, satisfying: 8mm ≤ W1 ≤ 35mm; and / or,

[0033] Along the first direction, the maximum width of the pole post is W2, satisfying: 14mm ≤ W2 ≤ 80mm; and / or,

[0034] Along the first direction, the maximum width W1 of the first connecting part and the maximum width W2 of the pole post satisfy the following condition: 20% ≤ W1 / W2 ≤ 60; wherein the first direction, the second direction and the third direction intersect each other.

[0035] In one or more embodiments of this application, the second connecting portion includes a first metal layer and a second metal layer, which are stacked along the thickness direction of the second connecting portion, wherein the interface between the first metal layer and the second metal layer intersects with the sidewall surface of the second connecting portion.

[0036] In one or more embodiments of this application, the second connecting portion includes a third sub-portion and a fourth sub-portion. The third sub-portion connects the transition portion and the fourth sub-portion. Along the second direction, on a plane perpendicular to the second direction Y, the orthographic projection of the fourth sub-portion falls within the orthographic projection range of the third sub-portion. A second stepped surface connects the sidewall surface of the fourth sub-portion and the sidewall surface of the third sub-portion. The end surface of the fourth sub-portion away from the third sub-portion is a second electrical connection surface.

[0037] In one or more embodiments of this application, the first connecting portion includes a first sub-part and a second sub-part. The first sub-part connects the transition portion and the second sub-part. Along the second direction, on a plane perpendicular to the second direction Y, the orthographic projection of the second sub-part falls within the orthographic projection range of the first sub-part. A first step surface connects the sidewall surface of the second sub-part and the sidewall surface of the first sub-part. The end surface of the second sub-part away from the first sub-part is a first electrical connection surface.

[0038] In one or more embodiments of this application, along the second direction, the minimum distance between the transition portion and the first step surface is b, which satisfies: 0.4mm≤b≤1mm.

[0039] In a second aspect, this application provides a top cover assembly, including a top cover sheet and an electrode post as described in any of the first aspects;

[0040] The top cover plate has a first through hole along its thickness direction, a first connecting part is disposed on one side of the top cover plate, and a second connecting part is at least partially inserted into the first through hole. In the thickness direction of the top cover plate, the projection of the second connecting part falls into the first through hole.

[0041] Thirdly, this application provides a top cover assembly, including: a top cover sheet and an electrode post, wherein the top cover sheet has a first through hole along its thickness direction, and the electrode post includes:

[0042] At least one first connecting part is provided for connecting with an electrical connector, and the first connecting part is provided on one side of the top cover plate;

[0043] At least two second connecting portions are provided for connecting to the electrode tabs. The second connecting portions are at least partially inserted into the first through hole. Each first connecting portion is provided between two adjacent second connecting portions and is connected to the two adjacent second connecting portions. The at least two second connecting portions are arranged at intervals along a first direction.

[0044] A transition portion is connected between the first connecting portion and the second connecting portion. Along a third direction, the length of the transition portion is less than the length of the first connecting portion and less than the length of the second connecting portion, wherein the first direction and the third direction intersect.

[0045] In one or more embodiments of this application, along the second direction, the orthographic projection of the second connection portion of the pole falls within the first through hole, wherein the first direction, the second direction, and the third direction intersect each other.

[0046] In one or more embodiments of this application, at least a portion of the orthographic projection of the transition portion falls within the first through hole along the second direction, wherein the first direction, the second direction, and the third direction intersect each other.

[0047] In one or more embodiments of this application, the transition portion includes a first end and a second end disposed opposite to each other along its longitudinal direction. Along the second direction, the second connecting portion has a first end face disposed close to the first connecting portion. The first end is connected to the first end face, and the second end is connected to the side wall surface of the first connecting portion along the first direction. The first direction, the second direction, and the third direction intersect each other.

[0048] In one or more embodiments of this application, the transition portion includes a first connecting segment and a second connecting segment, the first end being the end of the first connecting segment that is away from the second connecting segment, the first connecting segment extending along a second direction, and the second end being the end of the second connecting segment that is away from the first connecting segment, the second connecting segment extending along a first direction.

[0049] In one or more embodiments of this application, the transition portion further includes a third connecting segment, which connects the first connecting segment and the second connecting segment, and the third connecting segment is arc-shaped.

[0050] In one or more embodiments of this application, along a first direction, the side wall surface of the first connecting segment near the first connecting portion and the side wall surface of the second connecting portion near the first connecting portion are on the same plane.

[0051] In one or more embodiments of this application, along a second direction, the second connecting segment has a first surface and a second surface disposed opposite to each other, the first surface and the second surface being parallel; and / or,

[0052] Along the second direction, the first connecting portion has a second end face disposed near the second connecting portion, wherein the first face and the second end face are on the same plane.

[0053] In one or more embodiments of this application, the transition portion includes a first end and a second end disposed opposite to each other along its longitudinal direction, the first end being connected to the side wall surface of the second connecting portion along a first direction, and the second end being connected to the side wall surface of the first connecting portion along a first direction.

[0054] In one or more embodiments of this application, the transition portion includes a first connecting segment, a second connecting segment, and a fourth connecting segment. The fourth connecting segment connects between the first connecting segment and the second connecting segment. The first end is the end of the first connecting segment that is away from the fourth connecting segment. The first connecting segment extends along a first direction. The second end is the end of the second connecting segment that is away from the fourth connecting segment. The second connecting segment extends along the first direction. The fourth connecting segment extends along a second direction. The first direction, the second direction, and the third direction intersect each other.

[0055] In one or more embodiments of this application, the transition portion further includes a third connecting segment and a fifth connecting segment. The third connecting segment is connected between the first connecting segment and the fourth connecting segment, and the fifth connecting segment is connected between the second connecting segment and the fourth connecting segment. Both the third connecting segment and the fifth connecting segment are arc-shaped.

[0056] In one or more embodiments of this application, along the second direction, the side wall surface of the first connecting segment near the first connecting portion is in the same plane as the first end face of the second connecting portion; and / or,

[0057] Along the second direction, the first connecting portion has a second end face disposed near the second connecting portion, and the side wall surface of the second connecting segment near the second connecting portion is in the same plane as the second end face.

[0058] In one or more embodiments of this application, along a first direction, the fourth connecting segment has a third surface and a fourth surface that are disposed opposite to each other and are parallel to each other.

[0059] In one or more embodiments of this application, along the thickness direction of the third connecting segment, the third connecting segment has a first arc surface and a second arc surface disposed opposite to each other, and the arc radius of the first arc surface is greater than the arc radius of the second arc surface;

[0060] Along the thickness direction of the fifth connecting segment, the fifth connecting segment has a third arc surface and a fourth arc surface that are arranged opposite to each other, and the radius of the arc of the third arc surface is smaller than the radius of the arc of the fourth arc surface. The first arc surface and the third arc surface are located on the same side of the thickness direction of the transition section, and the second arc surface and the fourth arc surface are located on the same side of the thickness direction of the transition section.

[0061] In one or more embodiments of this application, along the second direction, the first connecting portion has a second end face and a first electrical connection face disposed opposite to each other, the second end face is disposed close to the second connecting portion, and the first electrical connection face is connected to an electrical connector; along the second direction, the second connecting portion has a first end face disposed close to the first connecting portion, the second end face is closer to the first electrical connection face than the first end face, wherein the first direction, the second direction and the third direction intersect each other.

[0062] Fourthly, this application provides a battery cell, comprising: a housing, an electrode assembly, and a top cover assembly as described in the second or third aspect, wherein the housing has an opening; the electrode assembly has tabs and is received within the housing; and the top cover assembly covers the opening of the housing.

[0063] Fifthly, this application provides a battery comprising the battery cell described in the fourth aspect.

[0064] In a sixth aspect, this application provides an electrical device comprising a battery cell as described in the fourth aspect, or a battery as described in the fifth aspect.

[0065] In a seventh aspect, this application provides a method for processing an electrode post as described in any of the first aspects, comprising the following steps:

[0066] Provide a sheet material;

[0067] The sheet metal is pressed to form at least one first connecting area and at least two second connecting areas on the sheet metal, as well as a transition area connecting the first connecting area and each of the second connecting areas;

[0068] The transition area is bent to form a transition section, a first connecting section is formed in the first connecting section area, and a second connecting section is formed in the second connecting section area.

[0069] Based on the above technical solutions, the terminal post and processing method, top cover assembly, battery cell, battery and power device of this application have at least the following beneficial technical effects:

[0070] The electrode post provided in this application embodiment has at least one first connecting portion, at least two second connecting portions, and a transition portion. The transition portion connects between the first and second connecting portions along a first direction, which can reduce the occupied size in the width direction of the electrode post and leave more space for the welding surface width of the first and second connecting portions, thereby reducing the overall size in the width direction of the electrode post and making it suitable for battery cells with limited space in the top cover assembly design. The length of the transition portion along the third direction is less than the length of the first connecting portion and less than the length of the second connecting portion, so that the current-passing area of ​​the transition portion is less than the current-passing area of ​​the first and second connecting portions and less than the current-passing area of ​​the second connecting portion. When an abnormality occurs in the circuit within the battery cell, the transition portion will melt and cut off the circuit before the first and second connecting portions, improving the safety performance of the battery. Attached Figure Description

[0071] 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.

[0072] Figure 1 This is a side view of a battery cell provided in an embodiment of this application.

[0073] Figure 2 yes Figure 1 Sectional view of AA.

[0074] Figure 3 This is a side view of the top cover assembly provided in an embodiment of this application.

[0075] Figure 4 yes Figure 3 AA section view.

[0076] Figure 5 This is an exploded disassembly diagram of the top cover assembly provided in an embodiment of this application.

[0077] Figure 6 This is a three-dimensional structural diagram of the pole post in the top cover assembly provided in the embodiments of this application.

[0078] Figure 7 This is a side view of the pole post in the top cover assembly provided in the embodiments of this application.

[0079] Figure 8This is a three-dimensional structural diagram of the pole post in the top cover assembly provided in another embodiment of this application.

[0080] Figure 9 This is a side view of the pole post in the top cover assembly provided in another embodiment of this application.

[0081] Figure 10 This is an enlarged side view of the transition portion of the pole post in a top cover assembly provided in one embodiment of this application.

[0082] Figure 11 This is a side view of a battery cell provided in another embodiment of this application.

[0083] Figure 12 yes Figure 11 Cross-sectional view of the middle section (BB).

[0084] Figure 13 This is a side view of a top cover assembly provided in another embodiment of this application.

[0085] Figure 14 yes Figure 13 BB cross-section diagram.

[0086] Figure 15 This is an exploded disassembly diagram of the top cover assembly provided in another embodiment of this application.

[0087] Figure 16 This is a three-dimensional structural diagram of the pole post in the top cover assembly provided in another embodiment of this application.

[0088] Figure 17 This is a three-dimensional structural diagram of the pole post in the top cover assembly provided in another embodiment of this application.

[0089] Figure 18 This is a side view of the pole post in the top cover assembly provided in another embodiment of this application.

[0090] Figure 19 This is a three-dimensional structural diagram of the pole post in the top cover assembly provided in another embodiment of this application.

[0091] Figure 20 This is a side view of the pole post in the top cover assembly provided in another embodiment of this application.

[0092] Figure 21 This is an enlarged side view of the transition portion of the pole post in a top cover assembly provided in another embodiment of this application.

[0093] Figure 22 This is a step-by-step illustration of a pole piece processing method according to an embodiment of this application.

[0094] Figure 23 This is a step-by-step illustration of a pole piece processing method according to another embodiment of this application.

[0095] In the figure: 1-First insulating component; 2-Electrode post; 3-Top cover plate; 4-Second insulating component; 5-Housing; 6-Electrode assembly; 10-First connecting part; 11-First sub-part; 12-Second sub-part; 20-Second connecting part; 22-First metal layer; 23-Second metal layer; 24-Third sub-part; 25-Fourth sub-part; 30-Transition part; 31-First connecting section; 32-Second connecting section; 33-Third connecting section; 34-Fourth connecting section; 35-Fifth connecting section; 41-Second through hole; 3001-First through hole; 3002-Support part; 3003-Notch; 61-Electrode tab; 100-First insulating part; 200-Second insulating part; 300-Third insulating part; 101-First outer peripheral surface; 102-First electrode Connecting surface; 103-Second end face; 104-First step surface; 201-Second outer peripheral surface; 202-First end face; 203-Second step surface; 204-Second electrical connection surface; 301-First end; 302-Second end; 321-First surface; 322-Second surface; 331-First arc surface; 332-Second arc surface; 341-Third surface; 342-Fourth surface; 351-Third arc surface; 352-Fourth arc surface; 400-Sheet material; 401-First connecting area; 402-Second connecting area; 403-Transition area; 2011-First bending section; 2012-First straight section; 2013-Second bending section; 2014-Second straight section; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] In related technologies, the electrode post has five parts along its width: a first connecting part in the middle, two second connecting parts on either side of the first connecting part, and a transition part connecting the first and second connecting parts. The first connecting part is connected to the second connecting parts on both sides through the transition part. The first connecting part is used for welding with electrical connectors, and the second connecting parts are used for welding with the tabs of the electrode assembly. Since both the first and second connecting parts have requirements for welding area, their widths cannot be too small, otherwise it will affect the current carrying capacity of the electrode post. However, in related technologies, the width of the electrode post is relatively large. For battery cells with a small thickness, such as those less than 45mm, the design space for the width of the top cover assembly is limited, which restricts the design size of the electrode post. This results in a weaker current carrying capacity, which is not conducive to improving the charge-discharge performance and safety performance of the battery, and also increases the processing difficulty of the electrode post.

[0101] Based on the above considerations, and in order to address the technical problems of existing technologies where the electrode posts are too wide, difficult to process, and unsuitable for thinner battery cells, this application provides an electrical device, a battery, a battery cell, a top cover assembly, electrode posts, and a processing method thereof.

[0102] 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.

[0103] 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.

[0104] As one embodiment of the battery, 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. The multiple battery cells 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. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module, and then the multiple battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.

[0105] 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.

[0106] The aforementioned battery cells can be secondary or primary batteries; they can also be lithium-sulfur, sodium-ion, or magnesium-ion batteries, but are not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes.

[0107] As one embodiment of a battery cell, please refer to Figure 1 , Figure 2 Or such as Figure 11 , Figure 12As shown, a battery cell refers to the smallest unit that makes up a battery. A battery cell includes a housing 5, an electrode assembly 6, a top cover assembly, and other functional components. At least one end of the housing 5 has an opening, and the top cover assembly covers the opening of the housing 5 to isolate the internal environment of the battery cell from the external environment. The housing 5 has an internal cavity to accommodate the electrode assembly 6. The housing 5 is a component used to cooperate with the top cover assembly to form the internal environment of the battery cell, wherein the formed internal environment can accommodate the electrode assembly 6, electrolyte, and other components. The housing 5 and the top cover assembly can be independent components. An opening can be provided on the housing 5, and the internal environment of the battery cell is formed by the top cover assembly covering the opening. The housing 5 can have various shapes and sizes, such as cylindrical, cuboid, hexagonal prism, etc. Specifically, the shape of the housing 5 can be determined according to the specific shape and size of the electrode assembly 6. The material of the housing 5 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0108] As one embodiment of the electrode assembly, the electrode assembly 6 is a component in the battery cell that undergoes an electrochemical reaction with the electrolyte. The housing 5 may contain one or more electrode assemblies 6. The electrode assembly 6 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. The electrode assembly 6 is covered with an insulating film to reduce the risk of short circuits.

[0109] In some embodiments, each electrode assembly 6 extends a positive electrode tab and a negative electrode tab toward the end face of the top cover assembly, 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 are connected to the terminal post 2 to form a current loop.

[0110] In the embodiments of this application, such as Figure 2 or Figure 12As shown, the housing 5 contains two sets of electrode assemblies 6, each set including one electrode assembly 6, and the two sets of electrode assemblies 6 are arranged side by side along the thickness direction of the housing 5. The two sets of positive electrode tabs of the two sets of electrode assemblies 6 are arranged opposite each other as positive electrodes, and the two sets of negative electrode tabs of the two sets of electrode assemblies 6 are arranged opposite each other as negative electrodes. The two sets of positive electrode tabs and the two sets of negative electrode tabs are spaced apart along the length direction of the housing 5. In some other embodiments, the housing 5 may include at least two sets of electrode assemblies 6, each set of electrode assemblies 6 may be one electrode assembly 6 or multiple electrode assemblies 6, which is not limited here. When each set of electrode assemblies 6 includes multiple electrode assemblies 6, the positive electrode tabs of each electrode assembly 6 are brought together to form one set of positive electrode tabs, and the negative electrode tabs are brought together to form one set of negative electrode tabs.

[0111] It should be noted that the length direction of the housing 5 is also the length direction of the top cover plate 3 or the length direction of the electrode assembly 6, the thickness direction of the housing 5 is also the width direction of the top cover plate 3 or the thickness direction of the electrode assembly 6, and the height direction of the housing 5 is also the thickness direction of the top cover plate 3 or the height direction of the electrode assembly 6.

[0112] Before the electrode assembly 6 is installed into the housing 5, the electrode tab 61 of the electrode assembly 6 is first assembled with the top cover assembly, for example, the electrode post 2 of the top cover assembly is welded to the electrode tab 61 of the electrode assembly 6, and then the electrode assembly 6 is installed into the housing 5.

[0113] As one embodiment of the top cover assembly, please refer to Figures 3 to 5 As shown, or please refer to Figures 13 to 15 As shown, the top cover assembly includes a top cover sheet 3, which covers the opening of the housing 5. In any case, the shape of the top cover sheet 3 can be adapted to the shape of the housing 5 to fit the opening. The top cover sheet 3 can be made of a material with a certain hardness and strength (such as aluminum alloy or aluminum), so that the top cover sheet 3 is not easily deformed under pressure or impact, enabling the battery cell to have higher structural strength and improved safety performance. The material of the top cover sheet 3 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.

[0114] Please refer to Figure 5 or Figure 15 The top cover plate 3 has a first through hole 3001 extending through its thickness direction. The first through hole 3001 is used to install functional components, such as pole posts 2. For each pole post 2, the top cover plate 3 may be provided with one or more first through holes 3001. For example, in the embodiment of this application, for each pole post 2, two first through holes 3001 are provided along the width direction of the top cover plate 3.

[0115] In a specific embodiment, the first through hole 3001 can be formed as follows: Along the thickness direction of the top cover plate 3, the top cover plate 3 has a through hole, and a support portion 3002 is provided within the through hole. The two ends of the support portion 3002, arranged opposite each other along its longitudinal direction, are respectively connected to the two side walls of the through hole, arranged opposite each other along the length direction of the top cover plate 3, thereby dividing the through hole into two first through holes 3001 spaced apart along the width direction of the top cover plate 3. The support portion 3002 can be used to support the first connection portion 10 between the first insulating member 1 and the electrode post 2. The surface of the support portion 3002 facing the outside of the housing 5 is lower than the upper surface of the top cover plate 3. The upper surface of the top cover plate 3 refers to the side surface of the top cover plate 3 away from the interior of the housing 5. This arrangement reduces the distance between the welding surface connecting the electrode post 2 and the electrical connector and the upper surface of the top cover plate 3, improving the space utilization rate within the battery. Meanwhile, the support part 3002 allows the second connecting part 20 of the pole post 2 to be closer to the inside of the housing 5, which can reduce the height of the pole post 2 and thus reduce the processing difficulty of the pole post 2.

[0116] In some other embodiments, the first through hole 3001 can be formed as follows: a groove can be formed on the surface of the top cover plate 3 facing the outside of the housing 5, the groove being recessed from the surface of the top cover plate 3 facing the outside of the housing 5 toward the surface of the top cover plate 3 facing the inside of the housing. The first through hole 3001 penetrates the bottom wall of the groove along the thickness direction of the top cover plate 3. There can be a gap between the hole wall of the first through hole 3001 and the groove sidewall, that is, the hole wall of the first through hole 3001 and the groove sidewall are not aligned. The bottom wall of the groove is used to support the first connecting portion 10 of the first insulating member 1 and the pole 2. When the pole 2 is installed on the top cover plate 3, the groove reduces the distance between the first electrical connection surface 102 of the pole 2 facing the outside of the housing 5 and the upper surface of the top cover plate 3, thereby improving the space utilization of the battery; at the same time, the groove allows the second connecting portion 20 of the pole 2 to be closer to the inside of the housing 5, reducing the height of the second connecting portion 20, thereby reducing the height of the pole 2 and thus reducing the processing difficulty of the pole 2.

[0117] The top cover plate 3 may be provided with functional components such as pole post 2, first insulating component 1, and second insulating component 4. The top cover plate 3 and the functional components such as pole post 2, first insulating component 1, and second insulating component 4 provided on the top cover plate 3 together constitute the top cover assembly.

[0118] The terminal 2 can be electrically connected to the electrode assembly 6 to output or input electrical energy from the battery cell. The terminal 2 includes a positive terminal and a negative terminal. The positive terminal is connected to the positive electrode tab, thereby introducing the positive current of the battery cell into the interior of the housing 5 or leading it out of the housing 5. The negative terminal is connected to the negative electrode tab, thereby introducing the negative current of the battery cell into the interior of the housing 5 or leading it out of the housing 5. The positive and negative terminals of adjacent battery cells can be electrically connected in series, parallel, or in a mixed manner using electrical connectors.

[0119] 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 61" 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.

[0120] It should be noted that the first direction X, the second direction Y, and the third direction Z described in this application intersect each other. That is, the first direction X intersects the second direction Y, the first direction X intersects the third direction Z, and the second direction Y intersects the third direction Z. In some embodiments, the first direction X, the second direction Y, and the third direction Z are mutually perpendicular. The first direction X described in this application can be the width direction of the electrode post 2, that is, the width direction of the top cover plate 3, that is, the thickness direction of the electrode assembly 6 or the housing 5. The second direction Y can be the height direction of the electrode post 2, that is, the thickness direction of the top cover plate 3, that is, the height direction of the electrode assembly 6 or the housing 5. The third direction Z can be the length direction of the electrode post 2, that is, the length direction of the top cover plate 3, that is, the length direction of the electrode assembly 6 or the housing 5.

[0121] For details, please refer to Figure 6 , Figure 8 or Figure 16 , Figure 17 and Figure 19 The electrode post 2 includes at least one first connecting part 10 and at least two second connecting parts 20. The first connecting part 10 is used to connect with an electrical connector, and the second connecting parts 20 are used to connect with the tabs 61 of the electrode assembly 6.

[0122] Among them, such as Figure 4 or Figure 14As shown, the first connecting portion 10 is located on the side of the top cover plate 3 facing the outside of the housing 5, so that the first connecting portion 10 can be connected to the electrical connector. At least a portion of the second connecting portion 20 passes through the first through hole 3001 of the top cover plate 3, so that the second connecting portion 20 can be connected to the electrode tab 61. Each first connecting portion 10 is located between two adjacent second connecting portions 20 and is connected to the two adjacent second connecting portions 20. At least two second connecting portions 20 are arranged at intervals along the first direction X, that is, the width direction of the top cover plate 3, that is, at least two second connecting portions 20 are arranged at intervals along the width direction of the electrode post 2.

[0123] Please refer to Figures 6 to 9 or Figures 16 to 19In some embodiments, the first connecting portion 10 is a flat plate structure. Specifically, along the second direction Y, the first connecting portion 10 has a second end face 103 and a first electrical connection surface 102 disposed opposite to each other. In some embodiments, the second end face 103 extends perpendicular to the second direction Y and is located on the surface of the first connecting portion 10 facing the interior of the housing 5. Alternatively, the second end face 103 can be understood as being disposed close to the second connecting portion 20 and having a continuous planar structure. The first electrical connection surface 102 extends perpendicular to the second direction Y and is located on the surface of the first connecting portion 10 facing the exterior of the housing 5 and connected to the electrical connector. The first electrical connection surface 102 and the second end face 103 are disposed opposite to each other along the thickness direction of the first connecting portion 10, and the first electrical connection surface 102 has a continuous planar structure. The sidewall surface of the first connecting portion 10 forms a first outer peripheral surface 101, which surrounds the second end face 103 and extends in a direction perpendicular to the second end face 103. It is understood that the first outer peripheral surface 101 is connected to the second end surface 103 on one side along the second direction Y, i.e., along the thickness direction of the top cover plate 3, and the side of the first outer peripheral surface 101 away from the second end surface 103 is located close to the first electrical connection surface 102. In some other embodiments, the side of the first outer peripheral surface 101 away from the second end surface 103 may also be connected to the first electrical connection surface 102. It is understood that the distance between the second end surface 103 and the first electrical connection surface 102 is consistent at any position in the second direction Y, i.e., the thickness direction of the first connecting portion 10. At the same time, on the plane perpendicular to the second direction Y (or on the plane perpendicular to the thickness direction of the first connecting portion 10), the orthographic projection of the first outer peripheral surface 101 along the second direction Y is consistent with the orthographic projection of the second end surface 103 along the second direction Y. This makes the first connecting portion 10 have a plate-like structure, thus reducing the width of the first connecting portion 10 while ensuring the welding surface width of the first electrical connection surface 102. In other embodiments, the second end face 103 may not be a continuous planar structure. For example, the second end face 103 may also be provided with a groove, into which at least a portion of the first insulating member 1 is embedded to improve the bonding force between the first insulating member 1 and the pole post 2.

[0124] Please refer to Figure 6 , Figure 8 or Figure 16 , Figure 19The first connecting portion 10 includes a first sub-portion 11 and a second sub-portion 12, which are stacked along the second direction Y. Along the second direction Y, the orthographic projection of the second sub-portion 12 onto the top cover plate 3 falls within the orthographic projection range of the first sub-portion 11 onto the top cover plate 3. That is, the cross-sectional area of ​​the second sub-portion 12 is smaller than the cross-sectional area of ​​the first sub-portion 11. A first stepped surface 104 connects the sidewall surface of the second sub-portion 12 and the sidewall surface of the first sub-portion 11. The end surface of the second sub-portion 12 away from the first sub-portion 11 is a first electrical connection surface 102. The first electrical connection surface 102 is a welding surface for welding with an electrical connector. Both the first stepped surface 104 and the first electrical connection surface 102 are disposed opposite to the second end face 103 along the thickness direction of the first connecting portion 10, with the first electrical connection surface 102 protruding from the first stepped surface 104. It is understood that in this embodiment, the side of the first outer peripheral surface 101 away from the second end surface 103 is connected to the first stepped surface 104. The distance between the second end surface 103 and the first stepped surface 104 is consistent at any position in the thickness direction of the first connecting portion 10. Simultaneously, on a plane perpendicular to the second direction Y, the orthographic projection of the first outer peripheral surface 101 along the second direction Y is consistent with the orthographic projection of the second end surface 103 along the second direction Y. The first stepped surface 104 ensures that there is a distance between the edge of the first insulating member 1 covering the outside of the first connecting portion 10 and the first electrical connection surface 102, preventing interference with the first electrical connection surface 102 and thus affecting the welding quality between the first electrical connection surface 102 and the electrical connector. It is understood that during injection molding of the first insulating member 1, the first stepped surface 104 prevents plastic material from overflowing onto the first electrical connection surface 102 and affecting the welding quality.

[0125] like Figure 7 , Figure 9 , Figure 18 or Figure 20 As shown, along the second direction Y, the thickness h2 of the first connecting portion 10 satisfies: 1mm ≤ h2 ≤ 8mm. For example, h2 can be located within multiple ranges such as 1.5mm ≤ h2 ≤ 5, 1.5mm ≤ h2 ≤ 3, 2mm ≤ h2 ≤ 3, etc. Specifically, h2 = 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 8mm, or any value between any two of the above. Through the above settings, the thickness of the first connecting portion 10 is designed within a reasonable range, which facilitates the first connecting portion 10 to have a sufficient flow area. At the same time, the thickness of the first connecting portion 10 should not be too thick, as excessive thickness will occupy additional space and increase the overall weight of the pole post 2.

[0126] like Figure 7 , Figure 9 , Figure 18 or Figure 20 As shown, along the first direction X, the relationship between the maximum width W1 of the first connecting portion 10 and the maximum width W2 of the pole post 2 satisfies: 20% ≤ W1 / W2 ≤ 60%. For example, W1 / W2 can be located within multiple intervals such as 20% ≤ W1 / W2 ≤ 50%, 20% ≤ W1 / W2 ≤ 40%, or 30% ≤ W1 / W2 ≤ 40%. Specifically, W1 / W2 = 20%, 25%, 30%, 33%, 35%, 37%, 40%, 42%, 45%, 48%, 50%, 55%, or 60%, or any value between any two of the above. Through the above settings, the width of the first connecting portion 10 and the width of the second connecting portion 20 both meet the welding area requirements. When W1 / W2 is less than 20%, the width of the first connecting portion 10 will be smaller, the welding area will be smaller, and the welding point of the first connecting portion 10 will become a flow bottleneck. When W1 / W2 is greater than 60%, the width of the first connecting part 10 is larger, which will result in the width of the welding surface of the second connecting part 20 being smaller, making the welding point of the second connecting part 20 a bottleneck for flow.

[0127] like Figure 7 , Figure 9 , Figure 18 or Figure 20 As shown, along the first direction X, the maximum width W2 of the electrode post 2 satisfies: 14mm ≤ W2 ≤ 80mm. For example, W2 can be located within multiple intervals such as 14mm ≤ W2 ≤ 60mm, 14mm ≤ W2 ≤ 40mm, 14mm ≤ W2 ≤ 35mm, 20mm ≤ W2 ≤ 35mm, 14mm ≤ W2 ≤ 30mm, or 20mm ≤ W2 ≤ 30mm. Specifically, W2 = 14mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, or 80mm, or any value between any two of the above. Through the above settings, the width of the electrode post 2 allows the first connecting portion 10 and the two second connecting portions 20 to have a welding area that meets the requirements, and it can be applied to battery cells of various thicknesses.

[0128] like Figure 7 , Figure 9 , Figure 18 or Figure 20As shown, along the first direction X, the maximum width of the first connecting portion 10 is W1, satisfying: 8mm ≤ W1 ≤ 35mm. For example, W1 can be located within multiple intervals such as 8mm ≤ W1 ≤ 25mm, 8mm ≤ W1 ≤ 20mm, 8mm ≤ W1 ≤ 15mm, etc. Specifically, W1 = 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, or 35mm, or any value between any two of the above. Through the above settings, the first connecting portion 10 can have a welding surface width that meets the requirements.

[0129] Please refer to Figure 4 and Figure 14 Along the second direction Y, the orthographic projection of the second connecting portion 20 of the pole post 2 falls within the first through hole 3001. It can be understood that the orthographic projection of the second connecting portion 20 along the thickness direction of the top cover plate 3 does not overlap with the top cover plate 3, but falls completely within the first through hole 3001, thereby reducing the size occupied by the pole post 2 in the width direction of the top cover plate 3.

[0130] Please refer to Figure 6 , Figure 8 or Figure 16 , Figure 19 The second connecting portion 20 has a flat plate structure. Specifically, the second connecting portion 20 has a first end face 202 located near the first connecting portion 10. In some embodiments, the first end face 202 extends perpendicularly to the second direction Y and is located on the surface of the second connecting portion 20 facing the outside of the housing 5. This first end face 202 has a continuous planar structure. To achieve the connection between the second connecting portion 20 and the tab 61, the second connecting portion 20 also has a second electrical connection surface 204 extending perpendicularly to the second direction Y. The second electrical connection surface 204 is located on the surface facing the inside of the housing 5 and is connected to the tab 61. The second electrical connection surface 204 and the first end face 202 are arranged opposite each other along the thickness direction of the second connecting portion 20. The second electrical connection surface 204 has a continuous planar structure. The sidewall of the second connecting portion 20 forms a second outer peripheral surface 201, which surrounds the first end face 202. It can be understood that the side of the second outer peripheral surface 201 along the second direction Y is connected to the outer edge of the first end face 202, and the second outer peripheral surface 201 extends in a direction perpendicular to the first end face 202. Therefore, the side of the second outer peripheral surface 201 away from the first end face 202 is close to the second electrical connection surface 204. In some other embodiments, the side of the second outer peripheral surface 201 away from the first end face 202 is connected to the second electrical connection surface 204.

[0131] It is understandable that, along the second direction Y, i.e., along the thickness direction of the second connecting portion 20, no structure is provided inside the second connecting portion 20 that is recessed from the first end face 202 toward the second electrical connection surface 204 or protruding away from the second electrical connection surface 204. That is, in the second direction Y, i.e., along the thickness direction of the second connecting portion 20, the distance between the first end face 202 and the second electrical connection surface 204 is consistent at any position. Simultaneously, in a plane perpendicular to the second direction Y, the second connecting portion 20 does not have any flange structure extending from the second outer peripheral surface 201 in a direction away from the second connecting portion 20. Therefore, in a plane perpendicular to the second direction Y, the orthographic projection of the second outer peripheral surface 201 along the second direction Y is consistent with the orthographic projection of the first end face 202 along the second direction Y. Thus, the second connecting portion 20 has a plate-like structure, thereby reducing the overall width of the second connecting portion 20 while maintaining the welding surface width of the second electrical connection surface 204.

[0132] In some embodiments, please refer to Figure 6 or Figure 17 The second outer peripheral surface 201 includes a first curved section 2011, a first straight section 2012, a second curved section 2013, and a second straight section 2014 connected end to end. The first curved section 2011 and the second curved section 2013 are arranged opposite each other along the third direction Z, and the first straight section 2012 and the second straight section 2014 are arranged opposite each other along the first direction X, which makes processing convenient.

[0133] Please refer to Figure 6 , Figure 8 or Figure 16 , Figure 19The second connecting portion 20 includes a third sub-portion 24 and a fourth sub-portion 25. Along the second direction Y, the third sub-portion 24 and the fourth sub-portion 25 are stacked. On a plane perpendicular to the second direction Y, the orthographic projection of the fourth sub-portion 25 falls within the orthographic projection range of the third sub-portion 24; that is, the cross-sectional area of ​​the fourth sub-portion 25 is smaller than the cross-sectional area of ​​the third sub-portion 24. A second stepped surface 203 connects the sidewall of the fourth sub-portion 25 and the sidewall of the third sub-portion 24. The end surface of the fourth sub-portion 25 away from the third sub-portion 24 is a second electrical connection surface 204. Both the second stepped surface 203 and the second electrical connection surface 204 are disposed opposite to the first end face 202 along the thickness direction of the second connecting portion 20, with the second electrical connection surface 204 protruding from the second stepped surface 203. It can be understood that the side of the second outer peripheral surface 201 away from the first end face 202 is connected to the second stepped surface 203. In the second direction Y, i.e., the thickness direction of the second connecting portion 20, the distance between the first end face 202 and the second stepped surface 203 is consistent at any position. Simultaneously, on a plane perpendicular to the second direction Y, the orthographic projection of the second outer peripheral surface 201 along the second direction Y is consistent with the orthographic projection of the first end face 202 along the second direction Y. The provision of the second stepped surface 203 facilitates direct welding of the tab 61 to the second electrical connection surface 204, avoiding interference and damage to the tab 61 from other components, and improving the safety of the battery cell.

[0134] In some embodiments, please refer to Figure 4 The first end face 202 of the second connecting portion 20 is flush with the upper surface of the top cover plate 3 facing the outside of the housing 5. With this configuration, after the first insulating member 1 is injection molded between the top cover plate 3 and the pole post 2, the first insulating member 1 will be subjected to more uniform force, resulting in a longer sealing path. Furthermore, the injection pressure on the top cover plate 3 and the pole post 2 is more uniform during injection molding, making molding easier. In some other embodiments, such as... Figure 14 As shown, the first end face 202 of the second connecting portion 20 is located between the upper surface of the top cover plate 3 facing outwards from the housing 5 and the lower surface facing inwards from the housing 5. This arrangement ensures the welding depth between the second connecting portion 20 and the tab 61, while saving material for the electrode post 2, improving the space utilization rate inside the battery cell, and reducing processing difficulty. In some other embodiments, the first end face 202 may also protrude from the upper surface of the top cover plate 3.

[0135] In some embodiments, such as Figure 7 , Figure 9 , Figure 18 or Figure 20As shown, along the second direction Y, the thickness h1 of the second connecting portion 20 and the thickness h2 of the first connecting portion 10 satisfy the condition: h1 ≥ h2. That is, the thickness h1 of the second connecting portion 20 is not less than the thickness h2 of the first connecting portion 10. The thickness h2 only needs to satisfy the welding penetration depth. When h1 ≥ h2, the length of the sealing path of the first insulating member 1 to the electrode post 2 can be increased, thereby further improving the sealing performance of the battery cell.

[0136] In some embodiments, the relationship between the thickness h1 of the second connecting portion 20 and the thickness h2 of the first connecting portion 10 satisfies: 40% ≤ h2 / h1 ≤ 100%. For example, h2 / h1 = 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%, or any value between any two of the above. h2 / h1 can also be between 60% ≤ h2 / h1 ≤ 100%. For example, h2 / h1 = 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%, or any value between any two of the above. This configuration ensures that both the first connecting part 10 and the second connecting part 20 have sufficient welding penetration, thereby guaranteeing the current carrying capacity of the electrode post 2. Furthermore, it ensures that the electrode post 2 has an appropriate height, thereby improving the space utilization of the battery cell and the battery. In addition, it ensures that the first insulating member 1 has a sufficiently long sealing path for the electrode post 2, thereby guaranteeing the sealing performance of the battery cell.

[0137] In some embodiments, the thickness h1 of the second connecting portion 20 satisfies: 1mm ≤ h1 ≤ 8mm, for example, h1 = 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm, or any value between any two of the above. h1 can also be located within multiple ranges such as 1.5mm ≤ h1 ≤ 5mm, 1.5mm ≤ h1 ≤ 4mm, 2mm ≤ h1 ≤ 5mm, etc. For example, h1 = 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, or any value between any two of the above. Through the above settings, the thickness of the second connecting portion 20 is designed within a reasonable range so that the second connecting portion 20 has sufficient welding penetration to ensure the current carrying capacity of the pole post 2. At the same time, if the second connecting portion 20 is too thick, it will occupy additional space, increase the overall weight and material cost of the pole post 2.

[0138] In some embodiments, please refer to Figure 7 or Figure 9 or Figure 18 or Figure 20Along the second direction Y, the second end face 103 of the first connecting portion 10 is closer to the first electrical connection surface 102 of the first connecting portion 10 relative to the first end face 202 of the second connecting portion 20. That is, along the thickness direction of the top cover plate 3, from the inside of the housing 5 to the outside of the housing 5, the second end face 103 of the first connecting portion 10 is higher than the first end face 202 of the second connecting portion 20. This arrangement allows for a gap to be reserved between the first connecting portion 10 and the top cover plate 3 to fill part of the first insulating member 1, thereby insulating the first connecting portion 10 and the top cover plate 3. Furthermore, it prevents the thickness of the second connecting portion 20 from becoming too thick, reducing the overall weight of the pole post 2 and lowering material costs.

[0139] like Figure 7 , Figure 9 , Figure 18 or Figure 20 As shown, along the second direction Y, the relationship between the distance h3 between the second end face 103 and the first end face 202 and the total height h4 of the pole post satisfies: 1% ≤ h3 / h4 ≤ 20%. For example, h3 / h4 can also be within the range of 1% ≤ h3 / h4 ≤ 15%, specifically, h3 / h4 = 1%, 5%, 8%, 10%, 12%, 15%, 17%, 19%, or 20%, or any value between any two of the above. Through the above settings, the gap distance between the first connecting part 10 and the second connecting part 20 and the total height of the pole post 2 are set within a suitable range. When h3 / h4 is greater than 20%, the gap distance between the first connecting part 10 and the second connecting part 20 is large. When the total height of the pole post 2 is constant, it will lead to a reduction in the thickness of the first connecting part 10 and the second connecting part 20, which is not conducive to ensuring the welding penetration depth and reduces the current carrying capacity of the pole post 2. When h3 / h4 is less than 1%, the gap between the first connecting part 10 and the second connecting part 20 is small, which is not conducive to the setting of the transition part 30, nor is it conducive to filling the first insulating member 1 between the first connecting part 10 and the top cover plate 3.

[0140] like Figure 7 , Figure 9 , Figure 18 or Figure 20As shown, along the second direction Y, the distance between the second end face 103 and the first end face 202 is h3, which satisfies: 0.1mm ≤ h3 ≤ 1.2mm. For example, h3 can also be located within multiple intervals such as 0.1mm ≤ h3 ≤ 1mm, 0.2mm ≤ h3 ≤ 1mm, 0.1mm ≤ h3 ≤ 0.9mm, or 0.2mm ≤ h3 ≤ 0.9mm. Specifically, h3 = 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, or 1.2mm, or any value between any two of the above. The above settings ensure that the gap between the first connecting part 10 and the second connecting part 20 is within a suitable range, while also considering the processing difficulty and saving width dimensions. When h3 is greater than 1.2mm, the gap between the first connecting part 10 and the second connecting part 20 is large. With a fixed total height of the pole post 2, this leads to a reduction in the thickness of the first connecting part 10 and the second connecting part 20, which is detrimental to ensuring welding penetration and reduces the current-carrying capacity of the pole post 2. When h3 is less than 0.1mm, the gap between the first connecting part 10 and the second connecting part 20 is small, which is unfavorable for the setting of the transition part 30 and for filling the space between the first connecting part 10 and the top cover plate 3 with the first insulating member 1.

[0141] In some embodiments, such as Figure 7 , Figure 9 , Figure 18 or Figure 20As shown, there is a gap between the sidewall of the first connecting part 10 and the sidewall of the second connecting part 20. Specifically, along the first direction X, the minimum distance between the sidewall of the first connecting part 10 and the sidewall of the second connecting part 20 is 'a', satisfying: 1mm ≤ a ≤ 3mm. For example, a = 1mm, 1.2mm, 1.5mm, 1.7mm, 2.1mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.9mm, or 3mm, or any value between the two. 'a' can also be within multiple intervals such as 1mm ≤ a ≤ 2.5mm, 1mm ≤ a ≤ 2mm, 1.3mm ≤ a ≤ 1.7mm. For example, a = 1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, or any value between any two of the above. With the above configuration, the gap between the first connecting portion 10 and the second connecting portion 20 is not likely to be too large along the width direction of the pole post 2, while providing space for the transition portion 30 and reducing the width dimension of the pole post 2. When 'a' is too small, the thickness of the die punch used during processing is too small, reducing the lifespan of the die punch and making it easier to leave burrs on the edge of the pole post 2. Furthermore, when the width dimension of the pole post 2 is fixed, more space can be provided for the welding surface width of the first connecting portion 10 and the welding surface width of the second connecting portion 20.

[0142] It is understood that the number of second connecting parts 20 is not limited to two, but can also be three, four or more. The number of second connecting parts 20 can correspond to the number of electrode assemblies 6 inside the housing 5, so that each second connecting part 20 is connected to a set of electrode tabs 61 respectively.

[0143] When the number of electrode assemblies 6 arranged inside the housing 5 is N, the number of second connecting parts 20 is also set to N, where N is an integer greater than 1. The N second connecting parts 20 are spaced apart along the width direction of the top cover plate 3 and are connected to the first connecting parts 10. The N second connecting parts 20 pass through the first through hole 3001 and are connected to the tabs 61 of each group of electrode assemblies 6.

[0144] The second connecting part 20 of this application embodiment can be directly welded to the tab 61. Therefore, at least a portion of the second connecting part 20 passes through the first through hole 3001 and extends into the housing 5 to be directly connected to the tab 61. No adapter structure is required, which reduces the use of parts, reduces the cost of the battery cell, and at the same time reduces the internal resistance of the battery cell and increases the energy density of the battery cell.

[0145] In some other embodiments, the number of first connecting portions 10 is not limited to one, but can be two or more. The number of first connecting portions 10 is related to the number of second connecting portions 20. A first connecting portion 10 is provided between two adjacent second connecting portions 20. For example, when the number of second connecting portions 20 is 2, the number of first connecting portions 10 is 1. When the number of second connecting portions 20 is 3, the number of first connecting portions 10 is 2. When the number of second connecting portions 20 is 4, the number of first connecting portions 10 is 3, and so on. The second connecting portions 20 and the first connecting portions 10 are arranged alternately along the width direction of the top cover plate 3. For example, when the number of second connecting portions 20 is 3 and the number of first connecting portions 10 is 2, the pole post 2 includes, along the thickness direction of the top cover plate 3, a second connecting portion 20, a first connecting portion 10, a second connecting portion 20, a first connecting portion 10, and a second connecting portion 20 connected in sequence.

[0146] This embodiment of the application takes the example of two sets of electrode assemblies 6 arranged inside the housing 5, with each set of electrode assemblies 6 containing one electrode assembly. Since two sets of electrode assemblies 6 can be arranged inside the housing 5 along the first direction X, the two electrode assemblies 6 can extend positive and negative electrode tabs from the same end. The two positive electrode tabs 61 are arranged at intervals along the first direction X, the two sets of negative electrode tabs 61 are arranged at intervals along the first direction X, and the two sets of positive and negative electrode tabs are arranged at intervals along the third direction Z. Therefore, each pole post 2 is provided with two second connecting parts 20 and one first connecting part 10. The two second connecting parts 20 are arranged at intervals along the first direction X so as to directly connect with each set of electrode tabs 61. One first connecting part 10 is connected to the adjacent second connecting parts 20 on both sides along the first direction X so that the current drawn from the two second connecting parts 20 is output through one first connecting part 10. Compared with each second connecting part 20 corresponding to one first connecting part 10, the size and space occupied by the pole post 2 can be greatly reduced, saving materials and costs, and also facilitating processing.

[0147] The top cover plate 3 may have a first through hole 3001 corresponding to each second connecting part 20, so that each second connecting part 20 passes through the first through hole 3001 and is connected to the corresponding tab 61. It is understood that the number of first through holes 3001 can be the same as the number of second connecting parts 20. In this case, along the second direction Y, the orthographic projection of the first connecting part 10 and the orthographic projection of the first through hole 3001 may not overlap or may partially overlap. In other embodiments, the size of the first through hole 3001 may also allow two second connecting parts 20 to pass through.

[0148] Of course, terminal 2 in this application can be a positive terminal, or it can be a negative terminal. When terminal 2 is a negative terminal, such as... Figure 8 or Figure 19As shown, the second connecting portion 20 includes a first metal layer 22 and a second metal layer 23, which are stacked together. The second metal layer 23 is located on the side of the first metal layer 22 facing the interior of the housing. The first metal layer 22 can be connected to the first connecting portion 10 and is made of the same material. The second metal layer 23 is located on the side of the first metal layer 22 facing the electrode tab. The second metal layer 23 is in direct contact with the negative electrode tab for welding. More specifically, in this embodiment, the first metal layer 22 is an aluminum layer, and the second metal layer 23 is a copper layer. Since the material of the negative electrode tab of the electrode assembly is generally also copper, the second metal layer 23 is made of the same material as the negative electrode tab to improve the welding effect between the negative electrode post and the negative electrode tab.

[0149] In some embodiments, the interface between the first metal layer 22 and the second metal layer 23 intersects with the sidewall surface of the second connecting portion 20. In some embodiments, the end face of the interface between the first metal layer 22 and the second metal layer 23 is located on the second outer peripheral surface 201. Since the second outer peripheral surface 201 is sealed by the second insulating portion 200 of the first insulating member 1, this arrangement further avoids corrosion of the first metal layer 22, which is an aluminum layer, from contacting the electrolyte inside the casing 5, thereby affecting the safety performance of the battery.

[0150] As one embodiment of the terminal post 2, the terminal post 2 may further include a transition portion 30, which connects the first connecting portion 10 and the second connecting portion 20 along the first direction X. This reduces the size occupied by the terminal post 2 in the width direction, leaving more space for the welding surface width of the first connecting portion 10 and the welding surface width of the second connecting portion 20, thereby reducing the overall size of the terminal post 2 in the width direction and making it suitable for battery cells with limited space in the top cover assembly design. By designing the size of the transition portion 30, it can also be used as a fuse. A fuse is a safety protection structure that, in the event of thermal runaway in the battery cell, melts preferentially over the first connecting portion 10 and the second connecting portion 20. This allows the circuit to be disconnected promptly through the transition portion 30 in the event of thermal runaway within the battery cell.

[0151] To ensure that the transition portion 30 disconnects preferentially before the first connecting portion 10 and the second connecting portion 20 in the event of thermal runaway in a single battery cell, the length of the transition portion 30 is less than the length of both the first connecting portion 10 and the second connecting portion 20 along the third direction Z. This results in the current-carrying area of ​​the transition portion 30 being smaller than that of both the first and second connecting portions 10 and 20. The current-carrying area of ​​the transition portion 30 refers to its surface area perpendicular to the current flow direction, i.e., its minimum cross-sectional area. Similarly, the current-carrying areas of the first and second connecting portions 10 and 20 refer to their surface areas perpendicular to the current flow direction, i.e., their minimum cross-sectional areas. Thus, in actual use, when a circuit malfunctions, the smaller current-carrying area of ​​the transition portion 30 allows for faster temperature rise, enabling it to melt quickly and disconnect the circuit promptly, significantly improving battery safety. Figure 16 or Figure 17 In the embodiment shown, the length of the transition portion 30 along the third direction Z can be set according to the requirements of the flow area.

[0152] Please refer to Figure 7 , Figure 9 , Figure 18 or Figure 20 Along the second direction Y, the minimum distance between the transition portion 30 and the first step surface 104 is b, satisfying: 0.4mm ≤ b ≤ 1mm. For example, b = 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm, or any value between any two of the above. It can be understood that the minimum distance between the transition portion 30 and the first step surface 104 refers to the minimum value of the distances from any point on the transition portion 30 to the plane containing the first step surface 104 along the second direction Y. Through the above setting, the thickness of the portion of the first insulating member 1 located between the transition portion 30 and the first step surface 104 is neither too thick nor too thin. When b is less than 0.4mm, the thickness of the first insulating member 1 covering the area between the transition portion 30 and the first step surface 104 is too thin, making it prone to cracking and shrinkage. When b is greater than 1mm, it will affect the timely melting of the transition portion 30.

[0153] In some embodiments, such as Figure 4 or Figure 14 As shown, at least a portion of the orthographic projection of the transition portion 30 falls within the first through hole 3001 along the second direction Y. It can be understood that the orthographic projection of the transition portion 30 in the second direction Y can fall partially or entirely within the first through hole 3001, thereby reducing the space occupied by the transition portion 30 in the width direction of the top cover plate 3.

[0154] As one embodiment of pole post 2, please refer to Figures 9 to 10 The transition portion 30 includes a first end 301 and a second end 302 disposed opposite to each other along its longitudinal direction. It is understood that the longitudinal direction of the transition portion 30 refers to the direction of extension from the first connecting portion 10 to the second connecting portion 20 or from the second connecting portion 20 to the first connecting portion 10. The first end 301 refers to the end of the transition portion 30 connected to the second connecting portion 20, and the second end 302 refers to the end of the transition portion 30 connected to the first connecting portion 10. The first end 301 is connected to the first end face 202 of the second connecting portion 20, and the second end 302 is connected to the side wall surface of the first connecting portion 10. This allows the transition portion 30 to connect between the first end face 202 of the second connecting portion 20 and the side wall surface of the first connecting portion 10, allowing current to flow from the first end face 202 of the second connecting portion 20 along its thickness direction and through the transition portion 30 to the side wall surface of the first connecting portion 10, thereby reducing the size occupied by the transition portion 30 in the pole width direction.

[0155] Specifically, such as Figure 10 As shown, the transition portion 30 includes a first connecting segment 31, a second connecting segment 32, and a third connecting segment 33 connected together. The third connecting segment 33 connects between the first connecting segment 31 and the second connecting segment 32. The end of the first connecting segment 31 away from the third connecting segment 33 is connected to the first end face 202 of the second connecting portion 20. A first end 301 is formed at the end of the first connecting segment 31 connected to the first end face 202, that is, the first end 301 is the end of the first connecting segment 31 facing away from the second connecting segment 32. The first connecting segment 31 extends along the second direction Y. It can be understood that the first connecting segment 31 extends from the first end 301 in the second direction Y in a direction away from the first end face 202.

[0156] like Figure 10 As shown, the end of the second connecting segment 32 away from the third connecting segment 33 is connected to the side wall of the first connecting portion 10. The second end 302 is formed at the end of the second connecting segment 32 connected to the side wall of the first connecting portion 10; that is, the second end 302 is the end of the second connecting segment 32 away from the first connecting segment 31. The second connecting segment 32 extends along the first direction X. It can be understood that the second connecting segment 32 extends from the second end 302 along the first direction X in a direction away from the side wall of the first connecting portion 10. Along the thickness direction of the second connecting segment 32, the second connecting segment 32 has a first surface 321 and a second surface 322 disposed opposite to each other, and the first surface 321 and the second surface 322 are parallel. The first surface 321 and the second end surface 103 are on the same plane, thereby facilitating processing.

[0157] For ease of manufacturing, the third connecting segment 33 is arc-shaped; specifically, the two surfaces of the third connecting segment 33 in its thickness direction are arc-shaped. In some embodiments, the two surfaces of the third connecting segment 33 in its thickness direction are circular arc-shaped. Specifically, such as... Figure 10As shown, along the thickness direction of the third connecting segment 33, the third connecting segment 33 has a first arc surface 331 and a second arc surface 332 arranged opposite to each other. The first arc surface 331 is arranged towards the interior of the housing 5 relative to the second arc surface 332, and the radius of the arc of the first arc surface 331 is smaller than the radius of the arc of the second arc surface 332. In a longitudinal section perpendicular to the third direction Z, the central angle corresponding to the arc of the first arc surface 331 and the central angle corresponding to the arc of the second arc surface 332 can be the same, thereby facilitating the forming of the transition portion 30.

[0158] Of course, in some other embodiments, the two surfaces of the third connecting segment 33 in its thickness direction may also be flat slopes.

[0159] For ease of processing, such as Figure 10 As shown, along the first direction X, the side wall surface of the first connecting segment 31 near the first connecting portion 10 and the side wall surface of the second connecting portion 20 near the first connecting portion 10 are on the same plane. It can be understood that the side surface of the first connecting segment 31 that connects to the first arc surface 331 is flush with the side wall surface of the second connecting portion 20.

[0160] Based on the electrode post 2 described in the above embodiments, this application also provides a method for processing the electrode post 2. Please refer to... Figure 22 The processing method includes the following steps:

[0161] Step 1: Provide a sheet material 400. This sheet material 400 can be a partially composite sheet material (for forming the negative electrode post) where a portion (i.e., the area used to form each of the second connecting portions 20) contains the first metal layer 22 and the second metal layer 23, while the remaining areas (i.e., the areas used to form the first connecting portion 10 and each transition portion 30) do not contain the second metal layer 23. Alternatively, it can be a sheet material containing only the first metal layer 22 (for forming the positive electrode post).

[0162] Step 2: Press the plate 400 to create a height difference, so as to form at least one first connecting area 401 and at least two second connecting areas 402.

[0163] Step 3: Perform secondary pressing on the plate 400 to form a transition area 403 between the first connecting area 401 and each second connecting area 402.

[0164] Step 4: Bend the second connecting section 402 in the transition region 403, for example, bend it downwards, thereby forming the transition section 30 in the transition region 403.

[0165] Step 5: Perform folding again to form the first connecting part 10 in the first connecting area 401 and the second connecting part 20 in the second connecting area 402. Folding, or bending and shaping, is to reshape areas where the bending shape in step 4 is not perfect, such as some corner areas. If the bending effect in step 4 is good, the product's precision requirements are low, or in other cases, step 5 can be omitted. That is, after performing step 4, the transition area 403 forms the transition part 30, the first connecting area 401 forms the first connecting part 10, and the second connecting area 402 forms the second connecting part 20.

[0166] After step five, step six may also be included: forming a first step surface 104 on the surface of the first connecting portion 10 and forming a second step surface 203 on the surface of the second connecting portion 20.

[0167] The processing method described in this application is convenient and also greatly saves on the material of the electrode post, resulting in low production costs and faster production efficiency.

[0168] As another embodiment of pole post 2, please refer to Figures 20 to 21 The transition portion 30 includes a first end 301 and a second end 302 disposed opposite to each other along its longitudinal direction. It is understood that the longitudinal direction of the transition portion 30 refers to the direction of extension from the first connecting portion 10 to the second connecting portion 20 or from the second connecting portion 20 to the first connecting portion 10. The first end 301 refers to the end where the transition portion 30 connects to the second connecting portion 20, and the second end 302 refers to the end where the transition portion 30 connects to the first connecting portion 10. The first end 301 is connected to the side wall surface of the second connecting portion 20, and the second end 302 is connected to the side wall surface of the first connecting portion 10. This allows the transition portion 30 to connect between the side wall of the second connecting portion 20 and the side wall of the first connecting portion 10, allowing current to flow from the side wall of the second connecting portion 20 and through the transition portion 30 to the side wall of the first connecting portion 10, thereby reducing the size occupied by the transition portion 30 in the pole width direction.

[0169] In the embodiments of this application, please refer to Figure 15 Since the transition portion 30 is led out from the side wall of the second connecting portion 20, a notch 3003 is provided on the support portion 3002 of the top cover plate 3 to accommodate the transition portion 30, so as to provide clearance for the transition portion 30 and avoid the hole wall of the first through hole 3001 from interfering with the transition portion 30 and affecting the flow.

[0170] For details, please refer to Figure 21The transition section 30 includes a first connecting segment 31, a second connecting segment 32, a third connecting segment 33, a fourth connecting segment 34, and a fifth connecting segment 35 that are connected to each other. The fourth connecting segment 34 is connected between the first connecting segment 31 and the second connecting segment 32, the third connecting segment 33 is connected between the first connecting segment 31 and the fourth connecting segment 34, and the fifth connecting segment 35 is connected between the second connecting segment 32 and the fourth connecting segment 34.

[0171] The first end 301 is formed at the end where the first connecting segment 31 is connected to the side wall of the second connecting portion 20. That is, the first end 301 is the end of the first connecting segment 31 that is away from the fourth connecting segment 34. The first connecting segment 31 extends along the first direction X. It can also be understood that the first connecting segment 31 extends from the first end 301 along the first direction X in a direction away from the side wall of the second connecting portion 20.

[0172] The second end 302 is formed at the end where the second connecting segment 32 is connected to the side wall of the first connecting portion 10. That is, the second end 302 is the end of the second connecting segment 32 that is away from the fourth connecting segment. The second connecting segment 32 extends along the first direction X. The extension directions of the first connecting segment 31 and the second connecting segment 32 are parallel. It can be understood that the second connecting segment 32 extends from the second end 302 along the first direction X in a direction away from the side wall of the first connecting portion 10.

[0173] like Figure 21 As shown, for ease of processing, the third connecting segment 33 is arc-shaped; specifically, the two surfaces of the third connecting segment 33 in its thickness direction are arc surfaces. In some embodiments, the two surfaces of the third connecting segment 33 in its thickness direction are circular arc surfaces. Specifically, along the thickness direction of the third connecting segment 33, the third connecting segment 33 has a first arc surface 331 and a second arc surface 332 arranged opposite to each other. The first arc surface 331 faces the interior of the housing 5, and the second arc surface 332 faces the exterior of the housing 5. The radius of the arc of the first arc surface 331 is larger than the radius of the arc of the second arc surface 332. In a longitudinal section perpendicular to the third direction Z, the central angle corresponding to the arc of the first arc surface 331 and the central angle corresponding to the arc of the second arc surface 332 can be the same. Of course, in some other embodiments, the two surfaces of the third connecting segment 33 in its thickness direction can also be straight inclined surfaces.

[0174] like Figure 21As shown, for ease of processing, the fifth connecting segment 35 is arc-shaped. Specifically, the fifth connecting segment 35 has arc-shaped surfaces on both sides of its thickness direction. In some embodiments, the fifth connecting segment 35 has circular arc surfaces on both sides of its thickness direction. Specifically, along the thickness direction of the fifth connecting segment 35, the fifth connecting segment 35 has a third arc surface 351 and a fourth arc surface 352 disposed opposite to each other, and the radius of the arc of the third arc surface 351 is smaller than the radius of the arc of the fourth arc surface 352. The third arc surface 351 may be located on the same side of the thickness direction of the transition portion 30 as the first arc surface 331, that is, both facing the inside of the housing 5. The fourth arc surface 352 and the second arc surface 332 may be located on the same side of the thickness direction of the transition portion 30, that is, both facing the outside of the housing 5. In a longitudinal section perpendicular to the third direction Z, the central angle corresponding to the arc of the third arc surface 351 may be the same as the central angle corresponding to the arc of the fourth arc surface 352. Of course, in some other embodiments, the two surfaces of the fifth connecting segment 35 in its thickness direction may also be straight inclined surfaces.

[0175] like Figure 21 As shown, the extension direction of the fourth connecting segment 34 is perpendicular to the extension direction of the first connecting segment 31 or the second connecting segment 32. Along the thickness direction of the fourth connecting segment 34, the fourth connecting segment 34 has a third surface 341 and a fourth surface 342 disposed opposite to each other, and the third surface 341 and the fourth surface 342 are parallel. This facilitates processing.

[0176] like Figure 21 As shown, along the first direction X, the relationship between the distance c between the third surface 341 and the fourth surface 342 and the minimum distance a between the side wall of the first connecting part 10 and the side wall of the second connecting part 20 satisfies: 65% ≤ c / a ≤ 95%. For example, c / a = 65%, 68%, 70%, 73%, 75%, 79%, 82%, 85%, 88%, 89%, 92%, or 95%, or any value between any two of the above. This setting ensures that the distance c between the third surface 341 and the fourth surface 342 is within a suitable range. When c / a is less than 65%, the thickness of the fourth connecting section 34 is too small, affecting flow. When c / a is greater than 95%, the thickness of the fourth connecting section 34 is too large, which is detrimental to processing.

[0177] Along the first direction X, the distance between the third surface 341 and the fourth surface 342 is c, satisfying: 0.8mm ≤ c ≤ 3mm. For example, c can also be within other ranges such as 0.8mm ≤ c ≤ 2mm, 0.8mm ≤ c ≤ 1.5mm, etc. Specifically, c = 0.8mm, 1.0mm, 1.2mm, 1.3mm, 1.5mm, 1.6mm, 1.9mm, 2.1mm, 2.5mm, 2.7mm, 2.9mm, or 3mm, or any value between any two of the above. When c is less than 0.8mm, the thickness of the fourth connecting segment 34 will be too small, affecting the flow rate; when c is greater than 3mm, the thickness of the fourth connecting segment 34 will be too large, which is not conducive to processing.

[0178] For ease of processing, such as Figure 20 or Figure 21 As shown, along the second direction Y, the side wall surface of the first connecting segment 31 near the first connecting portion 10 is on the same plane as the first end face 202 of the second connecting portion 20. It can be understood that the side surface of the first connecting segment 31 connecting to the second arc surface 332 is aligned with the first end face 202. The side wall surface of the second connecting segment 32 near the second connecting portion 20 is on the same plane as the second end face 103. It can be understood that the side surface of the second connecting segment 32 connecting to the third arc surface 351 is aligned with the second end face 103.

[0179] Based on the pole post of the above embodiments, this application also provides another processing method for the pole post 2, please refer to... Figure 23 The processing method includes the following steps:

[0180] Step 1: Provide a sheet material 400. This sheet material 400 can be a partially composite sheet material (for forming the negative electrode post) where a portion (i.e., the area used to form each of the second connecting portions 20) contains the first metal layer 22 and the second metal layer 23, while the remaining areas (i.e., the areas used to form the first connecting portion 10 and each transition portion 30) do not contain the second metal layer 23. Alternatively, it can be a sheet material containing only the first metal layer 22 (for forming the positive electrode post).

[0181] Step 2: Press the plate 400 to form the transition area 403.

[0182] Step 3: Perform secondary pressing on the plate 400 to form at least one first connecting area 401 and at least two second connecting areas 402.

[0183] Step 4: Bend the first connecting region 401 and each of the second connecting regions 402 in the transition region 403 to form a transition region 30 in the transition region 403.

[0184] Step 5: Perform folding again to form the first connecting part 10 in the first connecting area 401 and the second connecting part 20 in the second connecting area 402. Folding, or bending and shaping, is to reshape areas where the bending shape in step 4 is not perfect, such as some corner areas. If the bending effect in step 4 is good, the product's precision requirements are low, or in other cases, step 5 can be omitted. That is, after performing step 4, the transition area 403 forms the transition part 30, the first connecting area 401 forms the first connecting part 10, and the second connecting area 402 forms the second connecting part 20.

[0185] The processing method described in this application is convenient and also greatly saves on the material of the electrode post, resulting in low production costs and faster production efficiency.

[0186] After step five, step six may also be included: forming a first step surface 104 on the surface of the first connecting portion 10 and forming a second step surface 203 on the surface of the second connecting portion 20.

[0187] The top cover 3 of this application is also provided with a first insulating element 1. As a preferred embodiment of the first insulating element 1, please refer to... Figure 4 , Figure 5 or Figure 14 , Figure 15 The first insulating member 1 of this application includes a first insulating portion 100, a second insulating portion 200, and a third insulating portion 300. The first insulating portion 100 is disposed on the side of the top cover plate 3 facing the interior of the housing 5. It is understood that the first insulating portion 100 is disposed between the side of the top cover plate 3 facing the interior of the housing 5 and the second connecting portion 20, forming an insulation, which can prevent the second connecting portion 20 from contacting and electrically connecting with the top cover plate 3. Along the second direction Y, at least a portion of the first insulating portion 100 is projected onto the top cover plate 3. It is understood that at least a portion of the first insulating portion 100 is bent below the wall of the first through hole 3001 towards the inner side of the top cover plate 3, which can seal the wall of the first through hole 3001 and prevent electrolyte leakage from the first through hole 3001.

[0188] The second insulating part 200 is disposed between the wall of the first through hole 3001 and the second connecting part 20 of the electrode post 2, so as to connect the second connecting part 20 and the wall of the first through hole 3001 through the second insulating part 200 and form insulation, and at the same time, it can also play a sealing role to prevent electrolyte from leaking out of the first through hole 3001. The second insulating part 200 can be in the form of a ring structure, with one end of the second insulating part 200 facing the inside of the housing 5 connected to the first insulating part 100, and the other end of the second insulating part 200 facing the outside of the housing 5 connected to the third insulating part 300.

[0189] The third insulating portion 300 is provided on the side of the top cover plate 3 facing the outside of the housing 5, that is, the third insulating portion 300 is provided on the outer side of the top cover plate 3, so as to insulate the pole portion of the top cover plate 3 facing the outside of the housing 5 and the top cover plate 3, and at the same time, the third insulating portion 300 can also play a sealing role. Along the second direction Y, at least a portion of the third insulating portion 300 is projected onto the top cover plate 3. It can be understood that the outer contour edge of the third insulating portion 300 protrudes from the hole wall of the first through hole 3001.

[0190] First, the first insulating part 100 and the second insulating part 200 are connected as a whole, forming an L-shape, which allows them to interlock with the top cover plate 3, thereby improving the fixing effect on the terminal post 2. Furthermore, when at least a portion of the orthographic projection of the third insulating part 300 falls on the top cover plate 3, the first insulating part 100 and the third insulating part 300 can jointly lock the top cover plate 3 from both sides along the second direction Y, further improving the fixing effect on the terminal post 2. Secondly, the sealing ring structure in the top cover assembly of related technologies can be eliminated, thus eliminating the size requirement of the sealing ring in the first direction X. Therefore, only the dimensions of the outer casing film at the edge of the top cover plate to the edge of the first insulating member 1, the dimensions of the two second connecting parts 20, and the dimensions of the first connecting part 10 need to be considered. Even for battery cells with small thicknesses and limited design width, the welding area of ​​the first connecting part 10 and the second connecting part 20 can be guaranteed, thus not affecting the battery's charging and discharging performance and safety performance. Finally, the second insulating part 200 passes through the first through hole 3001, which can prevent the electrolyte from leaking out of the first through hole 3001 due to compression failure of the sealing ring during long-term use. Furthermore, the first insulating part 100, the second insulating part 200 and the third insulating part 300 are connected as one unit, which can increase the sealing path for sealing the hole wall of the first through hole 3001, further preventing the electrolyte from leaking out of the first through hole 3001.

[0191] In this embodiment, the first insulating portion 100, the second insulating portion 200, and the third insulating portion 300 of the first insulating member 1 are integrally formed. Furthermore, the first insulating portion 100, the second insulating portion 200, and the third insulating portion 300 are integrally nano-injection molded. Nano-injection molding is a process technology that tightly bonds metal and plastic. By integrally nano-injection molding the first insulating portion 100, the second insulating portion 200, and the third insulating portion 300, the sealing performance of the battery cell can be greatly improved, thus further ensuring that the sealing ring can be eliminated in this application. Of course, in other embodiments, the first insulating portion 100, the second insulating portion 200, and the third insulating portion 300 can also be formed separately first, and then connected by bonding, heat fusion, or other methods.

[0192] Specifically, the surfaces of the top cover plate 3 that contact the first insulating part 100 and the second insulating part 200 are provided with nanopores, and parts of the first insulating part 100 and the second insulating part 200 are embedded in the nanopores; this can increase the bonding force and sealing performance between the first insulating part 100, the second insulating part 200 and the top cover plate 3. During the manufacturing process, a nanopore structure can be formed on the lower surface of the top cover plate 3 and the hole wall of the first through hole 3001 by chemical etching, thereby increasing the contact surface area of ​​the first insulating part 100, the second insulating part 200 and the top cover plate 3, and improving the bonding force and sealing performance.

[0193] In some embodiments, the surfaces of the electrode post 2 that contact the first insulating portion 100 and the second insulating portion 200 are provided with nanopores, and portions of the first insulating portion 100 and the second insulating portion 200 are embedded in the nanopores. During the manufacturing process, a nanopore structure can be formed on the circumferential side surface of the second connecting portion 20 of the electrode post 2 by chemical etching to increase the contact surface area with the first insulating portion 100 and the second insulating portion 200, thereby improving the bonding force and sealing performance between the first insulating portion 100, the second insulating portion 200 and the electrode post 2.

[0194] In some embodiments, the surface of the top cover plate 3 that contacts the third insulating portion 300 is provided with nanopores, and a portion of the third insulating portion 300 is embedded in the nanopores. During the manufacturing process, nanopore structures can be formed on the upper surface of the top cover plate 3 and the surface of the support portion 3002 by chemical etching, thereby increasing the contact surface area between the third insulating portion 300 and the top cover plate 3 and improving the bonding force and sealing performance between the third insulating portion 300 and the top cover plate 3.

[0195] In some embodiments, the surface of the pole post 2 that contacts the third insulating portion 300 is also provided with nanopores, and a portion of the third insulating portion 300 is embedded in the nanopores. During the manufacturing process, nanopore structures can be formed on the inner and outer surfaces of the first end face 202, the second end face 103, the first outer peripheral surface 101, and the transition portion 30 by chemical etching, thereby increasing the contact surface area between the third insulating portion 300 and the pole post 2 and improving the bonding force and sealing performance between the third insulating portion 300 and the pole post 2.

[0196] As one embodiment of the top cover assembly, please refer to Figure 4 , Figure 5 or Figure 14 , Figure 15 The top cover plate 3 may also be provided with a second insulating member 4. The second insulating member 4 is provided on the surface of the top cover plate 3 facing the inside of the housing 5, and is used to insulate the top cover plate 3 and the electrode assembly 6 to reduce the risk of short circuit. For example, the second insulating member 4 may be a plastic material, such as PP, PE, PPS, etc.

[0197] Specifically, the second insulating member 4 is provided with a second through hole 41 corresponding to the first through hole 3001. The second through hole 41 penetrates the thickness direction of the second insulating member 4. The second connecting part 20 passes through the first through hole 3001 and the second through hole 41 in sequence so that the second connecting part 20 can be welded to the electrode tab 61.

[0198] 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. An electrode post, characterized in that, include: At least one first connecting part (10) is used for connection with an electrical connector; At least two second connecting portions (20) are used to connect to the electrode tab, wherein each of the first connecting portions (10) is disposed between two adjacent second connecting portions (20) and connected to two adjacent second connecting portions (20), and at least two second connecting portions (20) are arranged at intervals along a first direction (X); A transition portion (30) is connected between the first connecting portion (10) and the second connecting portion (20) along a third direction (Z). The length of the transition portion (30) is less than the length of the first connecting portion (10) and less than the length of the second connecting portion (20), wherein the first direction (X) and the third direction (Z) intersect.

2. The pole post according to claim 1, characterized in that, The transition portion (30) includes a first end (301) and a second end (302) disposed opposite to each other along its longitudinal direction. Along the second direction (Y), the second connecting portion (20) has a first end face (202) disposed near the first connecting portion (10). The first end (301) is connected to the first end face (202), and the second end (302) is connected to the side wall surface of the first connecting portion (10) along the first direction (X). The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

3. The pole post according to claim 2, characterized in that, The transition section (30) includes a first connecting segment (31) and a second connecting segment (32). The first end (301) is the end of the first connecting segment (31) that is away from the second connecting segment (32). The first connecting segment (31) extends along the second direction (Y). The second end (302) is the end of the second connecting segment (32) that is away from the first connecting segment (31). The second connecting segment (32) extends along the first direction (X).

4. The pole post according to claim 3, characterized in that, The transition section (30) further includes a third connecting section (33), which is connected between the first connecting section (31) and the second connecting section (32), and the third connecting section (33) is arc-shaped.

5. The electrode post according to claim 3, characterized in that, Along the first direction (X), the side wall surface of the first connecting segment (31) near the first connecting part (10) and the side wall surface of the second connecting part (20) near the first connecting part (10) are on the same plane.

6. The pole post according to claim 3, characterized in that, Along the second direction (Y), the second connecting segment (32) has a first surface (321) and a second surface (322) disposed opposite to each other; The first surface (321) and the second surface (322) are parallel, and / or, Along the second direction (Y), the first connecting portion (10) has a second end face (103) disposed near the second connecting portion (20), wherein the first face (321) and the second end face (103) are in the same plane.

7. The pole post according to claim 1, characterized in that, The transition portion (30) includes a first end (301) and a second end (302) disposed opposite to each other along its longitudinal direction. The first end (301) is connected to the side wall of the second connecting portion (20) along the first direction (X), and the second end (302) is connected to the side wall of the first connecting portion (10) along the first direction (X).

8. The pole post according to claim 7, characterized in that, The transition section (30) includes a first connecting segment (31), a second connecting segment (32), and a fourth connecting segment (34). The fourth connecting segment (34) is connected between the first connecting segment (31) and the second connecting segment (32). The first end (301) is the end of the first connecting segment (31) that is away from the fourth connecting segment (34). The first connecting segment (31) extends along the first direction (X). The second end (302) is the end of the second connecting segment (32) that is away from the fourth connecting segment (34). The second connecting segment (32) extends along the first direction (X). The fourth connecting segment (34) extends along the second direction (Y). The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

9. The pole post according to claim 8, characterized in that, The transition section (30) further includes a third connecting segment (33) and a fifth connecting segment (35). The third connecting segment (33) is connected between the first connecting segment (31) and the fourth connecting segment (34), and the fifth connecting segment (35) is connected between the second connecting segment (32) and the fourth connecting segment (34). Both the third connecting segment (33) and the fifth connecting segment (35) are arc-shaped.

10. The pole post according to claim 9, characterized in that, Along the second direction (Y), the side wall surface of the first connecting segment (31) near the first connecting portion (10) is in the same plane as the first end face (202) of the second connecting portion (20); and / or, Along the second direction (Y), the first connecting portion (10) has a second end face (103) disposed near the second connecting portion (20), and the side wall surface of the second connecting segment (32) near the second connecting portion (20) is in the same plane as the second end face (103).

11. The pole post according to claim 9, characterized in that, Along the first direction (X), the fourth connecting segment (34) has a third surface (341) and a fourth surface (342) arranged opposite to each other, the third surface (341) and the fourth surface (342) being parallel.

12. The pole post according to claim 11, characterized in that, Along the first direction (X), the distance between the third surface (341) and the fourth surface (342) is c, satisfying: 0.8mm ≤ c ≤ 3mm; and / or, Along the first direction (X), the distance between the third surface (341) and the fourth surface (342) is c, and the minimum distance between the side wall of the first connecting part (10) and the side wall of the second connecting part (20) is a, satisfying: 65% ≤ c / a ≤ 95%.

13. The pole post according to claim 9, characterized in that, Along the thickness direction of the third connecting segment (33), the third connecting segment (33) has a first arc surface (331) and a second arc surface (332) arranged opposite to each other, wherein the arc radius of the first arc surface (331) is greater than the arc radius of the second arc surface (332); Along the thickness direction of the fifth connecting segment (35), the fifth connecting segment (35) has a third arc surface (351) and a fourth arc surface (352) arranged opposite to each other, and the radius of the arc of the third arc surface (351) is smaller than the radius of the arc of the fourth arc surface (352). The first arc surface (331) and the third arc surface (351) are located on the same side of the thickness direction of the transition portion (30), and the second arc surface (332) and the fourth arc surface (352) are located on the same side of the thickness direction of the transition portion (30).

14. The pole post according to any one of claims 1 to 13, characterized in that, The sidewall of the second connecting portion (20) forms a second outer peripheral surface (201), which surrounds the first end face (202) and extends in a direction perpendicular to the first end face (202), and / or, Along the second direction (Y), the first connecting portion (10) has a second end face (103) disposed near the second connecting portion (20), and the sidewall surface of the first connecting portion (10) forms a first outer peripheral surface (101), the first outer peripheral surface (101) is disposed around the second end face (103), and the first outer peripheral surface (101) extends in a direction perpendicular to the second end face (103), and / or, The first connecting part (10) is flat, and / or, The second connecting part (20) is flat.

15. The pole post according to any one of claims 1 to 13, characterized in that, Along the second direction (Y), the first connecting portion (10) has a second end face (103) and a first electrical connection face (102) disposed opposite to each other. The second end face (103) is disposed close to the second connecting portion (20), and the first electrical connection face (102) is connected to an electrical connector. Along the second direction (Y), the second connecting portion (20) has a first end face (202) disposed close to the first connecting portion (10), and the second end face (103) is closer to the first electrical connection face (102) than the first end face (202). The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

16. The pole post according to claim 15, characterized in that, Along the second direction (Y), the distance between the second end face (103) and the first end face (202) is h3, satisfying: 0.1mm ≤ h3 ≤ 1.2mm; and / or, Along the second direction (Y), the distance between the second end face (103) and the first end face (202) is h3, and the total height of the pole is h4, satisfying: 1% ≤ h3 / h4 ≤ 20%.

17. The pole post according to any one of claims 1 to 13, characterized in that, Along the first direction (X), the minimum distance between the side wall of the first connecting part (10) and the side wall of the second connecting part (20) is a, which satisfies: 1mm≤a≤3mm.

18. The pole post according to any one of claims 1 to 13, characterized in that: Along the second direction (Y), the thickness of the second connecting portion (20) is h1, and the thickness of the first connecting portion (10) is h2, satisfying: h1 ≥ h2; and / or, The thickness h1 of the second connecting part (20) satisfies: 1mm ≤ h1 ≤ 8mm; and / or, The thickness h2 of the first connecting portion (10) satisfies: 1mm ≤ h2 ≤ 8mm; and / or, The thickness h1 of the second connecting portion (20) and the thickness h2 of the first connecting portion (10) satisfy: 40% ≤ h2 / h1 ≤ 100%; and / or, Along the first direction (X), the maximum width of the first connecting portion (10) is W1, satisfying: 8mm ≤ W1 ≤ 35mm; and / or, Along the first direction (X), the maximum width of the pole post is W2, satisfying: 14mm ≤ W2 ≤ 80mm; and / or, Along the first direction (X), the maximum width W1 of the first connecting part (10) and the maximum width W2 of the pole post satisfy the following: 20% ≤ W1 / W2 ≤ 60; The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

19. The pole post according to any one of claims 1 to 13, characterized in that, The second connecting portion (20) includes a first metal layer (22) and a second metal layer (23), which are stacked along the thickness direction of the second connecting portion (20), wherein the interface between the first metal layer (22) and the second metal layer (23) intersects with the sidewall surface of the second connecting portion (20).

20. The pole post according to any one of claims 1 to 13, characterized in that, The second connecting part (20) includes a third sub-part (24) and a fourth sub-part (25). The third sub-part (24) connects the transition part (30) and the fourth sub-part (25). Along the second direction (Y), on a plane perpendicular to the second direction (Y), the orthographic projection of the fourth sub-part (25) falls within the orthographic projection range of the third sub-part (24). A second step surface (203) is connected between the side wall surface of the fourth sub-part (25) and the side wall surface of the third sub-part (24). The end surface of the fourth sub-part (25) away from the third sub-part (24) is a second electrical connection surface (204).

21. The pole post according to any one of claims 1 to 13, characterized in that, The first connecting part (10) includes a first sub-part (11) and a second sub-part (12). The first sub-part (11) connects the transition part (30) and the second sub-part (12). Along the second direction (Y), on a plane perpendicular to the second direction (Y), the orthographic projection of the second sub-part (12) falls within the orthographic projection range of the first sub-part (11). A first step surface (104) is connected between the side wall surface of the second sub-part (12) and the side wall surface of the first sub-part (11). The end surface of the second sub-part (12) away from the first sub-part (11) is a first electrical connection surface (102).

22. The pole post according to claim 21, characterized in that, Along the second direction (Y), the minimum distance between the transition portion (30) and the first step surface (104) is b, which satisfies: 0.4mm≤b≤1mm.

23. A top cover assembly, characterized in that, Includes a top cover plate (3) and an electrode post as described in any one of claims 1 to 22; The top cover plate (3) has a first through hole (3001) along its thickness direction. The first connecting part (10) is disposed on one side of the top cover plate (3). The second connecting part (20) is at least partially inserted into the first through hole (3001). In the thickness direction of the top cover plate (3), the projection of the second connecting part (20) falls into the first through hole (3001).

24. A top cover assembly, characterized in that, include: A top cover plate (3) and a pole post (2), wherein the top cover plate (3) has a first through hole (3001) along its thickness direction, and the pole post (2) includes: At least one first connecting part (10) is provided for connection with an electrical connector, and the first connecting part (10) is disposed on one side of the top cover plate (3); At least two second connecting portions (20) are used to connect with the electrode tabs. The second connecting portions (20) are at least partially inserted into the first through hole (3001). Each of the first connecting portions (10) is disposed between two adjacent second connecting portions (20) and connected to the two adjacent second connecting portions (20). The at least two second connecting portions (20) are arranged at intervals along a first direction (X). A transition portion (30) is connected between the first connecting portion (10) and the second connecting portion (20) along a third direction (Z). The length of the transition portion (30) is less than the length of the first connecting portion (10) and less than the length of the second connecting portion (20), wherein the first direction (X) and the third direction (Z) intersect.

25. The top cover assembly according to claim 24, characterized in that, Along the second direction (Y), the orthographic projection of the second connecting portion (20) of the pole post (2) falls within the first through hole (3001), wherein the first direction (X), the second direction (Y) and the third direction (Z) intersect each other.

26. The top cover assembly according to claim 24, characterized in that, Along the second direction (Y), at least a portion of the orthographic projection of the transition portion (30) falls within the first through hole (3001), wherein the first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

27. The top cover assembly according to claim 24, characterized in that, The transition portion (30) includes a first end (301) and a second end (302) disposed opposite to each other along its longitudinal direction. Along the second direction (Y), the second connecting portion (20) has a first end face (202) disposed near the first connecting portion (10). The first end (301) is connected to the first end face (202), and the second end (302) is connected to the side wall surface of the first connecting portion (10) along the first direction (X). The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

28. The top cover assembly according to claim 27, characterized in that, The transition section (30) includes a first connecting segment (31) and a second connecting segment (32). The first end (301) is the end of the first connecting segment (31) that is away from the second connecting segment (32). The first connecting segment (31) extends along the second direction (Y). The second end (302) is the end of the second connecting segment (32) that is away from the first connecting segment (31). The second connecting segment (32) extends along the first direction (X).

29. The top cover assembly according to claim 28, characterized in that, The transition section (30) further includes a third connecting section (33), which is connected between the first connecting section (31) and the second connecting section (32), and the third connecting section (33) is arc-shaped.

30. The top cover assembly according to claim 28, characterized in that, Along the first direction (X), the side wall surface of the first connecting segment (31) near the first connecting part (10) and the side wall surface of the second connecting part (20) near the first connecting part (10) are on the same plane.

31. The top cover assembly according to claim 28, characterized in that, Along the second direction (Y), the second connecting segment (32) has a first surface (321) and a second surface (322) disposed opposite to each other, the first surface (321) and the second surface (322) being parallel; and / or, Along the second direction (Y), the first connecting portion (10) has a second end face (103) disposed near the second connecting portion (20), wherein the first face (321) and the second end face (103) are in the same plane.

32. The top cover assembly according to claim 24, characterized in that, The transition portion (30) includes a first end (301) and a second end (302) disposed opposite to each other along its longitudinal direction. The first end (301) is connected to the side wall of the second connecting portion (20) along the first direction (X), and the second end (302) is connected to the side wall of the first connecting portion (10) along the first direction (X).

33. The top cover assembly according to claim 32, characterized in that, The transition section (30) includes a first connecting segment (31), a second connecting segment (32), and a fourth connecting segment (34). The fourth connecting segment (34) is connected between the first connecting segment (31) and the second connecting segment (32). The first end (301) is the end of the first connecting segment (31) that is away from the fourth connecting segment (34). The first connecting segment (31) extends along the first direction (X). The second end (302) is the end of the second connecting segment (32) that is away from the fourth connecting segment (34). The second connecting segment (32) extends along the first direction (X). The fourth connecting segment (34) extends along the second direction (Y). The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

34. The top cover assembly according to claim 33, characterized in that, The transition section (30) further includes a third connecting segment (33) and a fifth connecting segment (35). The third connecting segment (33) is connected between the first connecting segment (31) and the fourth connecting segment (34), and the fifth connecting segment (35) is connected between the second connecting segment (32) and the fourth connecting segment (34). Both the third connecting segment (33) and the fifth connecting segment (35) are arc-shaped.

35. The top cover assembly according to claim 34, characterized in that, Along the second direction (Y), the side wall surface of the first connecting segment (31) near the first connecting portion (10) is in the same plane as the first end face (202) of the second connecting portion (20); and / or, Along the second direction (Y), the first connecting portion (10) has a second end face (103) disposed near the second connecting portion (20), and the side wall surface of the second connecting segment (32) near the second connecting portion (20) is in the same plane as the second end face (103).

36. The top cover assembly according to claim 34, characterized in that, Along the first direction (X), the fourth connecting segment (34) has a third surface (341) and a fourth surface (342) arranged opposite to each other, the third surface (341) and the fourth surface (342) being parallel.

37. The top cover assembly according to claim 34, characterized in that, Along the thickness direction of the third connecting segment (33), the third connecting segment (33) has a first arc surface (331) and a second arc surface (332) arranged opposite to each other, wherein the arc radius of the first arc surface (331) is greater than the arc radius of the second arc surface (332); Along the thickness direction of the fifth connecting segment (35), the fifth connecting segment (35) has a third arc surface (351) and a fourth arc surface (352) arranged opposite to each other, and the radius of the arc of the third arc surface (351) is smaller than the radius of the arc of the fourth arc surface (352). The first arc surface (331) and the third arc surface (351) are located on the same side of the thickness direction of the transition portion (30), and the second arc surface (332) and the fourth arc surface (352) are located on the same side of the thickness direction of the transition portion (30).

38. The top cover assembly according to any one of claims 24 to 37, characterized in that, Along the second direction (Y), the first connecting portion (10) has a second end face (103) and a first electrical connection face (102) disposed opposite to each other. The second end face (103) is disposed close to the second connecting portion (20), and the first electrical connection face (102) is connected to an electrical connector. Along the second direction (Y), the second connecting portion (20) has a first end face (202) disposed close to the first connecting portion (10), and the second end face (103) is closer to the first electrical connection face (102) than the first end face (202). The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

39. A single battery cell, characterized in that, include: The shell (5) has an opening; An electrode assembly (6) having tabs (61) is housed within the housing (5); The top cover assembly according to claim 23 or any one of claims 24 to 38 is disposed over the opening of the housing (5).

40. A battery, characterized in that, Includes the battery cell as described in claim 39.

41. An electrical appliance, characterized in that, This includes the battery cell as described in claim 39, or the battery as described in claim 40.

42. A method for processing an electrode post as described in any one of claims 1 to 22, characterized in that, Includes the following steps: Provide a sheet material (400); The plate (400) is pressed to form at least one first connecting region (401) and at least two second connecting regions (402) on the plate (400), as well as a transition region (403) connecting the first connecting region (401) and each of the second connecting regions (402); The transition region (403) is bent to form a transition portion (30) in the transition region (403), a first connecting portion (10) is formed in the first connecting portion region (401), and a second connecting portion (20) is formed in the second connecting portion region (402).

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