Cover plate assembly and single battery

Abstract

This application discloses a cover plate assembly and a single battery cell, belonging to the field of battery technology. The cover plate assembly includes: a cover plate body with mounting holes; and a terminal post, which includes a terminal post body, a base plate, and a connector. The terminal post body passes through the mounting holes and is connected to the cover plate body, while the base plate is located on one side of the cover plate body. By separating the originally integrally formed terminal post body and base plate into two independent structures, a connection hole is opened on the base plate. Within the connection hole, the terminal post body and base plate are electrically connected via a connector. The connector acts as a safety structure to prevent overcurrent. Simultaneously, the connection hole on the base plate reduces the weight of the base plate. The connector is located within the connection hole, and its volume is less than or equal to the volume of the connection hole. The weight of the terminal post in this configuration is less than or equal to the original weight of the terminal post. Therefore, this configuration ensures overcurrent protection while maintaining or reducing the weight of the original battery.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a cover plate assembly and a single battery cell. Background Technology

[0002] With continuous technological advancements, users have increasingly higher demands for new energy batteries. To improve the safety performance of individual battery cells, overcurrent protection structures are typically incorporated to prevent thermal runaway caused by excessive current over a prolonged period, which could lead to high temperatures. While these protection structures enhance battery safety, they also increase the battery's weight. Summary of the Invention

[0003] Purpose of the invention: This application provides a cover assembly designed to overcome the technical problem that the installation of the safety structure increases the weight of the battery; another purpose of this application is to provide a single battery cell.

[0004] Technical solution: A cover plate assembly according to an embodiment of this application includes:

[0005] The cover plate body has mounting holes;

[0006] The electrode post includes an electrode post body, a base plate, and a connector. The electrode post body passes through the mounting hole and is connected to the cover plate body. The base plate is located on one side of the cover plate body and has a connection hole. At least a portion of the electrode post body is located in the connection hole and is spaced apart from the base plate. The connector is located in the connection hole, and the electrode post body is electrically connected to the base plate through the connector.

[0007] In some embodiments, the pole post includes a plurality of the connectors, which are arranged at intervals around the pole post body.

[0008] In some embodiments, the cover plate assembly includes:

[0009] An insulating element is located inside the connection hole and surrounds the pole body. The insulating element is connected to the pole body and the base plate respectively, and covers multiple connecting elements.

[0010] In some embodiments, the insulating member has a plurality of receiving holes communicating with the connecting hole, the plurality of receiving holes being arranged at circumferential intervals along the insulating member, and each connector passing through one of the receiving holes.

[0011] In some embodiments, along the width direction of the connector, the connector has a first sidewall and a second sidewall disposed opposite to each other. The first sidewall is connected to the pole body and the base plate, respectively, and the second sidewall is connected to the pole body and the base plate, respectively. The plane containing the first sidewall intersects the plane containing the second sidewall. The pole satisfies:

[0012] S = πamhn / 360°;

[0013] Wherein, S is the total flow area of ​​the connector, m is the angle between the plane containing the first sidewall and the plane containing the second sidewall, a is the maximum diameter of the pole body, h is the thickness of the connector, and n is the number of connectors.

[0014] In some embodiments, along the width direction of the connector, the connector has a first sidewall and a second sidewall disposed opposite to each other. The first sidewall is connected to the pole body and the base plate, respectively, and the second sidewall is connected to the pole body and the base plate, respectively. The plane containing the first sidewall is parallel to the plane containing the second sidewall. The pole satisfies:

[0015] S = bhn;

[0016] Where S is the total flow area of ​​the connector, b is the width of the connector, h is the thickness of the connector, and n is the number of connectors.

[0017] In some embodiments, in the thickness direction of the base plate, the maximum dimension of the base plate is H, and the maximum dimension of the connector is h, satisfying: 1 / 2 ≤ h / H ≤ 2 / 3.

[0018] In some embodiments, the pole post includes a welded portion located on the side of the base plate opposite to the cover plate body, the welded portion being connected to the base plate and disposed around the connection hole, and the welded portion being configured to electrically connect the pole post to the tab.

[0019] In some embodiments, the welding portion includes a plurality of welding bodies spaced apart, all of which are connected to the base plate and surround the connection hole, and all of which are electrically connected to the corresponding electrode tab.

[0020] A single-cell battery, comprising:

[0021] The cover plate assembly as described in any one of the above statements, and,

[0022] A housing having a mounting cavity and an opening communicating with the mounting cavity, the cover assembly sealing the opening;

[0023] An electrode assembly is disposed within the mounting cavity and is electrically connected to the electrode post of the cover plate assembly.

[0024] Beneficial Effects: The cover plate assembly of this application embodiment includes: a cover plate body having a mounting hole; a terminal post, the terminal post including a terminal post body, a base plate, and a connector, the terminal post body passing through the mounting hole and connected to the cover plate body, the base plate located on one side of the cover plate body and having a connection hole, at least a portion of the terminal post body located within the connection hole and spaced apart from the base plate, the connector located within the connection hole, and the terminal post body electrically connected to the base plate via the connector. By dividing the originally integrally formed terminal post body and base plate into two independent structures, a connection hole is opened on the base plate, and the terminal post body and base plate are electrically connected within the connection hole via the connector. The connector can act as a safety structure to prevent overcurrent. At the same time, opening a connection hole on the base plate reduces the weight of the base plate. The connector is located within the connection hole, and the volume of the connector is less than or equal to the volume of the connection hole. The weight of the terminal post in this configuration is less than or equal to the original weight of the terminal post. Therefore, through this configuration, while ensuring overcurrent protection, the original weight of the battery can be maintained, or the weight of the battery can be reduced. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0026] Figure 1 This is a cross-sectional view of the cover plate assembly according to an embodiment of this application;

[0027] Figure 2 This is an exploded view of the pole and insulating component in an embodiment of this application;

[0028] Figure 3 This is a perspective view of the pole and the insulating component after connection in an embodiment of this application;

[0029] Figure 4 This is a front sectional view of an embodiment of this application after the pole and the insulating component are connected;

[0030] Figure 5 This is a top view of the pole structure according to an embodiment of this application, wherein the extending directions of the sides of the connector intersect.

[0031] Figure 6 This is a schematic diagram of the structure of the connector of the first type in the embodiments of this application;

[0032] Figure 7This is a top view of the pole structure according to an embodiment of this application, wherein the extension directions of the side of the connector are parallel;

[0033] Figure 8 This is a schematic diagram of the structure of the connector of the second form according to the embodiments of this application;

[0034] Figure 9 This is a bottom view of the pole structure according to an embodiment of this application, wherein the welded part is a single unit;

[0035] Figure 10 This is a bottom view of the pole structure according to an embodiment of this application, wherein there are multiple welded parts;

[0036] Reference numerals: 10-Cover plate body; 11-Mounting hole; 20-Pole post; 21-Pole post body; 22-Base plate; 221-Connecting hole; 23-Connector; 231-First side wall; 232-Second side wall; 24-Welding part; 241-Welding body; 30-Insulating part; 31-Accommodating hole; X-Thickness direction; Y-Width direction. Detailed Implementation

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that 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. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0039] With continuous technological advancements, users have increasingly higher demands for new energy batteries. To improve the safety performance of individual battery cells, overcurrent protection structures are typically incorporated to prevent thermal runaway caused by prolonged periods of excessive current leading to overheating. Generally, fuses are located on the connecting tabs or by extending the terminal base plate. Currently, the overcurrent protection structure is located on the connecting tabs, which connect the tabs and the terminal. When the current is too high, the fuse on the connecting tab melts. However, adding connecting tabs increases the number of structural components, the weight of the battery, and consequently, the cost. Alternatively, extending the terminal base plate and adding the fuse structure there also increases the weight of the terminal, which in turn increases the weight of the battery and the cost. To reduce the number of structural components and the weight of the battery, relocating the fuse structure to the connection point between the terminal base plate and the terminal body is a more effective method.

[0040] In view of the above, embodiments of this application provide a cover plate assembly to overcome at least one of the above-mentioned technical problems.

[0041] Please see Figure 1 and Figure 2 In this embodiment of the application, the cover plate assembly includes a cover plate body 10 and a pole post 20.

[0042] The cover body 10 has mounting holes 11. The cover body 10 is the main part of the battery cover assembly and is used to seal the outer casing of the battery. It is typically made of durable materials, such as plastic, metal, or composite materials, to provide sufficient strength and durability. The cover body 10 has one or more mounting holes 11 for mounting other structures. The terminal post 20, combined with structures such as aluminum sheets and riveting blocks, can form the battery cover assembly.

[0043] The electrode post 20 includes an electrode post body 21, a base plate 22, and a connector 23. The electrode post body 21 passes through the mounting hole 11 and is connected to the cover plate body 10 to ensure a secure connection between the electrode post 20 and the cover plate body 10. The base plate 22 is located on one side of the cover plate body 10 and has a connection hole 221. At least a portion of the electrode post body 21 is located within the connection hole 221 and is spaced apart from the base plate 22. The connection hole 221 provides a receiving space, allowing a portion of the electrode post body 21 to enter and maintaining a certain distance from the base plate 22, thus preventing direct contact between the electrode post body 21 and the base plate 22. The connector 23 is located within the connection hole 221, and the electrode post body 21 is electrically connected to the base plate 22 through the connector 23. The connector 23 is generally made of a highly conductive metal material such as copper, aluminum, lead, or tin. By separating the originally integrated electrode body 21 and base plate 22 into two independent structures, which are electrically connected by a connector 23, the connector 23 melts when an overcurrent occurs, preventing current from flowing between the electrode body 21 and the base plate 22. This prevents the battery temperature from rising continuously and causing thermal runaway, thus improving battery safety. Simultaneously, a connection hole 221 is formed on the base plate 22, and the connector 23 is disposed within the connection hole 221. At least a portion of the electrode body 21 is also located within the connection hole 221, and the electrode body 21 and base plate 22 are electrically connected through the connector 23 within the connection hole 221. Because the connection hole 221 on the base plate 22 reduces its weight, the volume of the connector 23, if intended to be disposed within the connection hole 221, must be less than or equal to the volume of the connection hole 221. The material of connector 23 can be the same as or similar to that of base plate 22. Therefore, if the materials of connector 23 and base plate 22 have the same volume, their weights should be the same or similar. Based on the above, the volume of connector 23 must be less than or equal to the volume of connection hole 221. This ensures that the combined weight of connector 23 and the base plate 22 after the hole is made is less than or equal to the weight of the original terminal base plate 22 without connection hole 221. Therefore, with this configuration, while ensuring the battery has overcurrent protection, if the volume of connector 23 is equal to the volume of connection hole 221, the original battery weight can be maintained; if the volume of connector 23 is less than the volume of connection hole 221, the battery weight can be reduced, thus lowering costs.

[0044] Please see Figure 1 and Figure 2In some embodiments, the terminal post 20 includes multiple connectors 23, which are arranged at intervals around the terminal post body 21. To meet the requirement of a certain current-carrying area, multiple connectors 23 can be simultaneously placed within the connection hole 221. The terminal post body 21 and the base plate 22 are electrically connected through these multiple connectors 23. The arrangement of multiple connectors 23 around the terminal post body 21 at intervals indicates that the volume of the multiple connectors 23 is smaller than the volume of the connection hole 221. Consequently, the combined weight of the connectors 23 and the base plate 22 is less than the weight of the base plate 22 without the connection hole 221. Therefore, by arranging the multiple connectors 23 at intervals, the weight of the battery can be reduced, thus lowering the battery production cost.

[0045] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments, the cover assembly includes an insulating element 30. The insulating element 30 is located within the connection hole 221 and surrounds the terminal body 21. The insulating element 30 is connected to both the terminal body 21 and the base plate 22, and covers multiple connectors 23. When an overcurrent occurs in the battery, the temperature of the connectors 23, which act as a safety structure, rises until they melt, thus achieving a power-off effect and ensuring battery safety. The insulating element 30 is generally formed by injection molding. By positioning the insulating element 30 within the connection hole 221 and covering multiple connectors 23, the temperature of the connectors 23 rises, causing the portion of the insulating element 30 in contact with the connectors 23 to melt. The melted portion of the insulating element 30 can then wrap around the melted connectors 23, preventing the molten slag from reconnecting. In other words, by using a portion of the melted insulating element 30 to wrap and isolate the melted area of ​​the connectors 23, the reconnection of the melted parts of the connectors 23 is prevented, further improving the safety of the battery structure. Meanwhile, since the insulating component 30 is located inside the connection hole 221 and is generally made of insulating materials such as rubber or plastic, it is lightweight and will not increase the weight of the original battery structure. Due to the material, the weight is actually reduced compared to the existing battery structure after the insulating component 30 is installed.

[0046] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4In some embodiments, the insulating member 30 has a plurality of receiving holes 31 communicating with the connecting hole 221. The plurality of receiving holes 31 are arranged at intervals along the circumference of the insulating member 30, and each connector 23 passes through one receiving hole 31. In order to facilitate the insulating member 30 to cover the plurality of connectors 23, the insulating member 30 can be formed in the connecting hole 221 by injection molding. During the injection molding process, due to the plurality of connectors 23 in the connecting hole 221, a plurality of receiving holes 31 corresponding one-to-one with the connectors 23 will be formed on the injection-molded insulating member 30. The inner wall of the receiving hole 31 is in contact with the surface of the connector 23, which facilitates the heat transfer from the connector 23 to the insulating member 30, so that the part of the insulating member 30 in contact with the connector 23 melts. After the connector 23 melts, the melted part of the insulating member 30 can quickly fill the melted position of the connector 23, thereby preventing the melted position of the connector 23 from reconnecting. In the event of an overcurrent, the connector 23 can be effectively melted to break the current circuit and ensure the safety of the battery.

[0047] Please see Figure 4 , Figure 5 and Figure 6 In some embodiments, along the width direction Y of the connector 23 (the width direction Y intersects the thickness direction X, preferably, the width direction Y is perpendicular to the thickness direction X), the connector 23 has a first sidewall 231 and a second sidewall 232 disposed opposite to each other. The first sidewall 231 is connected to the pole body 21 and the base plate 22 respectively, and the second sidewall 232 is connected to the pole body 21 and the base plate 22 respectively, and the plane containing the first sidewall 231 intersects the plane containing the second sidewall 232. That is, the connector 23 is configured as a structure similar to an isosceles trapezoid. In the width direction of the connector 23, the plane containing the first sidewall 231 intersects the plane containing the second sidewall 232 (or the extension direction of the first sidewall 231 intersects the extension direction of the second sidewall 232). The width of the connector 23 is generally 0.5mm to 3mm, that is, when the connector 23 is configured, the distance between the first sidewall 231 and the second sidewall 232 in the width direction is in the range of 0.5mm to 3mm. The width of connector 23 can be any value among 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, and 3mm, or a range between any two values.

[0048] The terminal post 20 satisfies: S = πamhn / 360°; where S is the total current-carrying area of ​​the connector 23. In battery capacity design, the current-carrying capacity of a current-conducting material is determined (current-carrying capacity refers to the maximum tolerable current value set during battery design and manufacturing for current conditions). The current-carrying area of ​​the material can be obtained through the current-carrying capacity and the corresponding current-carrying coefficient. In the context of the connector 23, the current-carrying area refers to the total area through which current flows. m is the angle between the plane containing the first sidewall 231 and the plane containing the second sidewall 232. This angle can be obtained using tools such as a protractor. a is the maximum diameter of the terminal post body 21, and h is the thickness of the connector 23. The maximum diameter of the terminal post body 21 and the thickness of the connector 23 can be measured using tools such as calipers or micrometers. n is the number of connectors 23.

[0049] Since the connector 23 connects the pole body 21 and the base plate 22, and the base plate 22 surrounds the pole body 21, the connector 23 is generally designed in a trapezoidal structure (e.g., Figure 5 and Figure 6 This structural design facilitates processing and installation. Given a defined flow area and meeting the required flow capacity, the number of connectors 23 can be quickly determined using the formula S = πamhn / 360°, improving the design efficiency of the cover assembly, eliminating the need for repeated structural testing, and shortening the design cycle.

[0050] Please see Figure 4 , Figure 7 and Figure 8 In some embodiments, along the width direction Y of the connector 23, the connector 23 has a first sidewall 231 and a second sidewall 232 disposed opposite to each other. The first sidewall 231 is connected to the pole body 21 and the base plate 22 respectively, and the second sidewall 232 is connected to the pole body 21 and the base plate 22 respectively, and the plane of the first sidewall 231 is parallel to the plane of the second sidewall 232. That is, the connector 23 is configured with a structure similar to a rectangle. In the width direction of the connector 23, the plane of the first sidewall 231 is parallel to the plane of the second sidewall 232 (or the extension direction of the first sidewall 231 is parallel to the extension direction of the second sidewall 232). The width of the connector 23 is generally 0.5mm to 3mm, that is, when the connector 23 is configured, the distance between the first sidewall 231 and the second sidewall 232 in the width direction is in the range of 0.5mm to 3mm. The width of connector 23 can be any value among 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, and 3mm, or a range between any two values.

[0051] The terminal 20 satisfies: S = bhn; where S is the total current-carrying area of ​​the connector 23. In battery capacity design, the current-carrying capacity of a current-conducting material is determined (current-carrying capacity refers to the maximum tolerable current value set during battery design and manufacturing for current conditions). The current-carrying area of ​​the material can be obtained through the current-carrying capacity and the corresponding material's current-carrying coefficient. In the context of connector 23, the current-carrying area refers to the total area through which current flows. b is the width of connector 23, and h is the thickness of connector 23. The width and thickness of connector 23 can be measured using calipers, micrometers, or other measuring tools. n is the number of connectors 23.

[0052] Since the connector 23 connects the pole body 21 and the base plate 22, and the base plate 22 surrounds the pole body 21, the connector 23 is generally designed as a rectangular structure (e.g., Figure 7 and Figure 8 This structural design facilitates processing and installation. Given a defined flow area and meeting the required flow capacity, the number of connectors 23 can be quickly set using the formula S = bhn, improving the design efficiency of the cover assembly, eliminating the need for repeated structural testing, and shortening the design cycle.

[0053] Please see Figure 4 In some embodiments, the maximum dimension of the base plate 22 in the thickness direction X is H, that is, the thickness of the base plate 22 is H, and the maximum dimension of the connector 23 is h, that is, the thickness of the connector 23 is h, satisfying: 1 / 2 ≤ h / H ≤ 2 / 3. When the connector 23 is disposed in the connecting hole 221, preferably, the thickness of the connector 23 is less than the thickness of the base plate 22, and the upper surface of the connector 23 is lower than the upper surface of the base plate 22, and the lower surface of the connector 23 is higher than the lower surface of the base plate 22. That is, the connector 23 is located in the connecting hole 221, and the upper and lower surfaces of the connector 23 are not flush with the upper and lower surfaces of the base plate 22. When setting the connector 23, its width is generally 0.5mm to 3mm. The thickness of the connector 23 varies depending on the thickness of the base plate 22. Currently, the thickness of the base plate 22 is generally 1mm to 3mm, therefore the thickness of the connector 23 is generally 1 / 2 to 2 / 3 of the thickness of the base plate 22. When setting the insulating component 30, the upper and lower surfaces of the insulating component 30 can be flush with the upper and lower surfaces of the base plate 22, ensuring that the insulating component 30 can cover multiple connectors 23 while its molten portion can fill the molten position of the connector 23. Simultaneously, the insulating component 30 is located inside the connecting hole 221 and will not affect the structure outside the connecting hole 221.

[0054] Please see Figure 1 and Figure 9In some embodiments, the electrode post 20 includes a welding portion 24 located on the side of the base plate 22 away from the cover plate body 10. The welding portion 24 is connected to the base plate 22 and is arranged around the connection hole 221. The welding portion 24 is configured to electrically connect the electrode post 20 to the electrode tab. Current is transmitted between the electrode post 20 and the electrode tab. To facilitate the connection between the electrode post 20 and the electrode tab, the connection position can be set on the side of the base plate 22 of the electrode post 20 away from the cover plate body 10, that is, the electrode tab is connected to the side of the base plate 22 closer to the electrode tab itself. This allows the electrode tab to be set to a smaller length, thus achieving electrical connection with the electrode post 20. The electrode post 20 and the electrode tab are connected through the welding portion 24, and the current between them is also transmitted through the welding portion 24. The welding portion 24 is connected to the base plate 22 around the connection hole 221, which allows the current transmitted between the electrode tab and the electrode post 20 to pass evenly through multiple connectors 23. By ensuring that the current density of each connector 23 is the same, the temperature of each connector 23 can be approximately the same. In the event of an overcurrent in the battery, each connector 23 can melt within a similar time frame, preventing some connectors 23 from melting while others remain unmelted. This can also improve battery safety to some extent.

[0055] Please see Figure 1 and Figure 10 In some embodiments, the welding section 24 includes a plurality of welding bodies 241 spaced apart. Each welding body 241 is connected to the base plate 22 and surrounds the connection hole 221. Each welding body 241 is electrically connected to a corresponding electrode tab. While satisfying the requirement of surrounding the connection hole 221, the welding section 24 can also be configured with multiple spaced welding bodies 241. This arrangement allows for more uniform current flow through the multiple connectors 23, ensuring that the temperature of the connectors 23 is approximately the same. It also reduces the material used in the welding section 24, lowering the battery processing cost.

[0056] A single-cell battery includes the cover assembly described above, as well as a housing and an electrode assembly. The housing has a mounting cavity and an opening communicating with the mounting cavity, and the cover assembly seals the opening. The electrode assembly is disposed within the mounting cavity, and the tabs on the electrode assembly are electrically connected to the terminals 20 of the cover assembly.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] The cover plate assembly and single battery provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body (10) has mounting holes (11); The pole (20) includes a pole body (21), a base plate (22), and a connector (23). The pole body (21) passes through the mounting hole (11). The base plate (22) is located on one side of the cover plate body (10) and has a connection hole (221). At least a portion of the pole body (21) is located in the connection hole (221) and is spaced apart from the base plate (22). The connector (23) is located in the connection hole (221). The pole body (21) is electrically connected to the base plate (22) through the connector (23). The pole post (20) includes a plurality of the connectors (23), which are arranged at intervals around the pole post body (21); The cover plate assembly includes: An insulating element (30) is located inside the connecting hole (221) and is arranged around the pole body (21). The insulating element (30) is connected to the pole body (21) and the base plate (22) respectively, and covers multiple connecting elements (23). The insulating member (30) has a plurality of receiving holes (31) communicating with the connecting hole (221), the plurality of receiving holes (31) are arranged at intervals along the circumference of the insulating member (30), and each connecting member (23) passes through one of the receiving holes (31); When an overcurrent occurs between the pole body (21) and the base plate (22), the temperature of the connector (23) rises and melts, and the insulating part (30) in contact with the connector (23) melts and wraps around the connector (23).

2. The cover plate assembly according to claim 1, characterized in that, Along the width direction (Y) of the connector (23), the connector (23) includes a first sidewall (231) and a second sidewall (232) disposed opposite to each other. The first sidewall (231) is connected to the pole body (21) and the base plate (22) respectively, and the second sidewall (232) is connected to the pole body (21) and the base plate (22) respectively. The plane containing the first sidewall (231) intersects the plane containing the second sidewall (232). The pole (20) satisfies: S = πamhn / 360°; Wherein, S is the total flow area of ​​the connector (23), m is the angle between the plane of the first sidewall (231) and the plane of the second sidewall (232), a is the maximum diameter of the pole body (21), h is the thickness of the connector (23), and n is the number of connectors (23).

3. The cover plate assembly according to claim 1, characterized in that, Along the width direction (Y) of the connector (23), the connector (23) includes a first sidewall (231) and a second sidewall (232) disposed opposite to each other. The first sidewall (231) is connected to the pole body (21) and the base plate (22) respectively, and the second sidewall (232) is connected to the pole body (21) and the base plate (22) respectively. The plane containing the first sidewall (231) is parallel to the plane containing the second sidewall (232). The pole (20) satisfies: S = bhn; Where S is the total flow area of ​​the connector (23), b is the width of the connector (23), h is the thickness of the connector (23), and n is the number of connectors (23).

4. The cover plate assembly according to claim 1, characterized in that, In the thickness direction (X) of the base plate (22), the maximum dimension of the base plate (22) is H, and the maximum dimension of the connector (23) is h, satisfying: 1 / 2≤h / H≤2 / 3.

5. The cover plate assembly according to claim 1, characterized in that, The pole post (20) includes a welding part (24) located on the side of the base plate (22) away from the cover plate body (10). The welding part (24) is connected to the base plate (22) and arranged around the connection hole (221). The welding part (24) is configured to electrically connect the pole post (20) to the tab.

6. The cover plate assembly according to claim 5, characterized in that, The welding part (24) includes a plurality of welding bodies (241) spaced apart. The plurality of welding bodies (241) are all connected to the base plate (22) and surround the connection hole (221). The plurality of welding bodies (241) are all electrically connected to the corresponding electrode tab.

7. A single-cell battery, characterized in that, include: The cover plate assembly as described in any one of claims 1 to 6, and, A housing having a mounting cavity and an opening communicating with the mounting cavity, the cover assembly sealing the opening; An electrode assembly is disposed within the mounting cavity and is electrically connected to the pole (20) of the cover plate assembly.

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