Cover plate assembly and single battery

Abstract

The invention discloses a cover plate assembly and a single battery, and belongs to the technical field of batteries, the cover plate assembly comprises: a cover plate body having a mounting hole; the pole comprises a pole body, a bottom plate and a connecting piece, the pole body penetrates through the mounting hole and is connected with the cover plate body, and the bottom plate is located on one side of the cover plate body. The pole body and the bottom plate which are originally integrally arranged are divided into two independent structures, the connecting hole is formed in the bottom plate, the pole body and the bottom plate are electrically connected through the connecting piece in the connecting hole, the connecting piece can play a role of a safety structure and prevent overcurrent, and meanwhile, the connecting hole is formed in the bottom plate, so that the weight of the bottom plate is reduced, and the service life of the pole body is prolonged. The connecting piece is arranged in the connecting hole, the volume of the connecting piece is smaller than or equal to that of the connecting hole, and the weight of the arranged pole is smaller than or equal to that of the original pole, so that the weight of the original battery can be kept or the weight of the battery can be reduced while the overcurrent prevention function is ensured by adopting the arrangement mode.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a cover plate assembly and a single cell. Background Art

[0002] With the continuous development of technology, users have higher and higher requirements for new energy batteries. In order to improve the safety performance of battery cells, an overcurrent protection structure is usually set to prevent the temperature from rising after the current is too large for a long time, resulting in thermal runaway of the battery cell. The setting of the protection structure can improve the safety of the battery, but it increases the weight of the battery. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a cover plate assembly, aiming to overcome the technical problem that the setting of a safety structure increases the weight of the battery; another purpose of an embodiment of the present application is to provide a single cell.

[0004] Technical solution: A cover plate assembly described in an embodiment of the present application includes:

[0005] The cover body has a mounting hole;

[0006] A pole, the pole comprising a pole body, a base plate and a connector, the pole body being passed through the mounting hole and connected to the cover body, the base plate being located on one side of the cover body and having a connecting hole, at least a portion of the pole body being located in the connecting hole and spaced apart from the base plate, the connector being located in the connecting hole, and the pole body being electrically connected to the base plate via the connector.

[0007] In some embodiments, the pole includes a plurality of the connecting members, and the plurality of the connecting members are arranged at intervals around the pole body.

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

[0009] The insulating member is located in the connecting hole and is arranged around the pole body. The insulating member is respectively connected to the pole body and the bottom plate and covers a plurality of the connecting members.

[0010] In some embodiments, the insulating member has a plurality of accommodating holes connected to the connecting holes, the plurality of accommodating holes are arranged at intervals along the circumference of the insulating member, and each of the connecting members is passed through one of the accommodating holes.

[0011] In some embodiments, along the width direction of the connecting member, the connecting member has a first side wall and a second side wall arranged opposite to each other, the first side wall is respectively connected to the pole body and the bottom plate, the second side wall is respectively connected to the pole body and the bottom plate, and the plane where the first side wall is located intersects with the plane where the second side wall is located; the pole satisfies:

[0012] S = πamhn / 360°;

[0013] Among them, S is the total flow area of ​​the connecting piece, m is the angle between the plane where the first side wall is located and the plane where the second side wall is located, a is the maximum diameter of the pole body, h is the thickness of the connecting piece, and n is the number of the connecting pieces.

[0014] In some embodiments, along the width direction of the connecting member, the connecting member has a first side wall and a second side wall arranged opposite to each other, the first side wall is respectively connected to the pole body and the bottom plate, the second side wall is respectively connected to the pole body and the bottom plate, and the plane where the first side wall is located is parallel to the plane where the second side wall is located; the pole satisfies:

[0015] S = bhn;

[0016] Wherein, S is the total flow area of ​​the connecting member, b is the width of the connecting member, h is the thickness of the connecting member, and n is the number of the connecting members.

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

[0018] In some embodiments, the pole includes a welding portion located on a side of the base plate away from the cover plate body, the welding portion is connected to the base plate and arranged around the connecting hole, and the welding portion is configured to electrically connect the pole to the pole ear.

[0019] In some embodiments, the welding portion includes a plurality of welding bodies arranged at intervals, the plurality of welding bodies are all connected to the bottom plate and surround the connecting hole, and the plurality of welding bodies are all electrically connected to the corresponding tabs.

[0020] A single battery, comprising:

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

[0022] A housing, wherein the housing has a mounting cavity and an opening communicating with the mounting cavity, and the cover assembly covers the opening;

[0023] The electrode assembly is disposed in the mounting cavity and is electrically connected to the pole of the cover plate assembly.

[0024] Beneficial effect: The cover plate assembly of the embodiment of the present application comprises: a cover plate body having a mounting hole; a pole, the pole comprising a pole body, a base plate and a connector, the pole body is inserted into the mounting hole and connected to the cover plate body, the base plate is located on one side of the cover plate body and has a connecting hole, at least part of the pole body is located in the connecting hole and is spaced apart from the base plate, the connector is located in the connecting hole, and the pole body is electrically connected to the base plate through the connector. By dividing the originally integrated pole body and base plate into two independent structures, a connecting hole is opened on the base plate, and the pole body and the base plate are electrically connected in the connecting hole through the connector, the connector can play the role of a safety structure to prevent overcurrent, and at the same time, the connecting hole is opened on the base plate to reduce the weight of the base plate, the connector is set in the connecting hole, the volume of the connector is less than or equal to the volume of the connecting hole, and the weight of the pole set is less than or equal to the weight of the original pole, so through this setting method, while ensuring the overcurrent protection function, the weight of the original battery can be maintained, or the weight of the battery can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic cross-sectional structural diagram of a cover plate assembly according to an embodiment of the present application;

[0027] Figure 2 An exploded view of a pole and an insulating member according to an embodiment of the present application;

[0028] Figure 3 This is a three-dimensional diagram of the pole and the insulating member after being connected in the embodiment of the present application;

[0029] Figure 4 This is a front cross-sectional view of the embodiment of the present application after the pole and the insulating member are connected;

[0030] Figure 5 This is a schematic diagram of the top view of the pole according to an embodiment of the present application, wherein the extension directions of the side edges of the connecting member intersect;

[0031] Figure 6 This is a schematic diagram of the structure of the first form of the connector in the embodiment of the present application;

[0032] Figure 7This is a schematic diagram of the top view of the pole according to an embodiment of the present application, wherein the extension directions of the side edges of the connecting member are parallel;

[0033] Figure 8 This is a schematic diagram of the structure of the second form of the connecting member of the embodiment of the present application;

[0034] Fig. 9 This is a bottom view of the structure of the pole in the embodiment of the present application, wherein the welding part is an integral whole;

[0035] Fig.10 This is a bottom view of the structure of the pole according to an embodiment of the present application, wherein there are multiple welding parts;

[0036] Figure markings: 10-cover plate body; 11-mounting hole; 20-pole; 21-pole body; 22-bottom plate; 221-connecting hole; 23-connecting piece, 231-first side wall; 232-second side wall; 24-welding part; 241-welding body; 30-insulating piece; 31-accommodating hole; X-thickness direction; Y-width direction. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0039] With the continuous development of technology, users have higher and higher requirements for new energy batteries. In order to improve the safety performance of battery cells, an overcurrent protection structure is usually set to prevent the temperature from rising after the current is too large for a long time, resulting in thermal runaway of the battery. Generally, the insurance is usually set on the connecting piece, or the pole bottom plate is extended and added to the pole bottom plate. At present, the insurance structure to prevent overcurrent is set on the connecting piece, which connects the pole ear and the pole. When the current is too large, the insurance structure on the connecting piece will melt, but the addition of the connecting piece increases the number of structural parts, increases the weight of the battery, and increases the cost. In addition, there is also an extension of the pole bottom plate, and the insurance structure is added to the pole bottom plate. This solution increases the weight of the pole, which is equivalent to increasing the weight of the battery, and also increases the cost. In order to reduce the number of structural parts and reduce the weight of the battery, it is a more effective method to transfer the insurance structure to the connection between the pole bottom plate and the pole body.

[0040] In view of this, an embodiment of the present application provides a cover assembly to overcome at least one of the above-mentioned technical problems.

[0041] See also Figure 1 and Figure 2 In an embodiment of the present application, the cover plate assembly includes a cover plate body 10 and a pole 20 .

[0042] The cover body 10 has a mounting hole 11. The cover body 10 is the main part of the battery cover assembly and is used to close the outer shell of the battery. It is usually 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 pole 20 is combined and fixed with a structure such as a bare aluminum sheet, a rivet block, etc. to form a battery cover assembly.

[0043] The pole 20 includes a pole body 21, a bottom plate 22 and a connector 23. The pole body 21 is inserted into the mounting hole 11 and connected to the cover body 10 to ensure a stable connection between the pole 20 and the cover body 10. The bottom plate 22 is located on one side of the cover body 10 and has a connecting hole 221. At least part of the pole body 21 is located in the connecting hole 221 and is spaced apart from the bottom plate 22. The connecting hole 221 provides a accommodating space so that a part of the pole body 21 can enter therein and maintain a certain distance from the bottom plate 22, so as to avoid direct contact between the pole body 21 and the bottom plate 22. The connector 23 is located in the connecting hole 221, and the pole body 21 is electrically connected to the bottom plate 22 through the connector 23. The connector 23 is generally made of a metal material with good conductivity such as copper, aluminum, lead, and tin. By dividing the originally integrated pole body 21 and bottom plate 22 into two independent structures, the two are electrically connected through the connector 23. When the current transmitted between the two is overcurrent, the connector 23 is melted, so that the current cannot be transmitted between the pole body 21 and the bottom plate 22, preventing the temperature of the battery from continuing to rise and thermal runaway, thereby improving the safety of the battery. At the same time, a connection hole 221 is opened on the bottom plate 22, and the connector 23 is set in the connection hole 221. At least a part of the pole body 21 is also located in the connection hole 221. The pole body 21 and the bottom plate 22 are electrically connected through the connector 23 located in the connection hole 221. Since the connection hole 221 is opened on the bottom plate 22, the weight of the bottom plate 22 is reduced. If the connector 23 is to be set in the connection hole 221, its volume needs to be less than or equal to the volume of the connection hole 221. The material of the connector 23 can be the same as that of the bottom plate 22, or the properties of the materials are similar, so the weight of the connector 23 and the bottom plate 22 should be the same or similar when the volumes are the same. In combination with the above, the volume of the connector 23 must be less than or equal to the volume of the connection hole 221, so that the sum of the weights of the connector 23 and the bottom plate 22 after the hole is opened is less than or equal to the weight of the pole bottom plate 22 without the connection hole 221. Therefore, through this setting, while ensuring that the battery has an overcurrent protection function, if the volume of the connector 23 is equal to the volume of the connection hole 221, the weight of the original battery can be maintained, and if the volume of the connector 23 is less than the volume of the connection hole 221, the weight of the battery can be reduced, while reducing costs.

[0044] See also Figure 1 and Figure 2In some embodiments, the pole 20 includes a plurality of connectors 23, and the plurality of connectors 23 are arranged at intervals around the pole body 21. When the connectors 23 are arranged, in order to meet the requirements of a certain flow area, a plurality of connectors 23 can be arranged in the connection hole 221 at the same time, and the pole body 21 and the bottom plate 22 are electrically connected through the plurality of connectors 23. The plurality of connectors 23 are arranged at intervals around the pole body 21. This arrangement means that the volume of the plurality of connectors 23 is smaller than the volume of the connection hole 221. Accordingly, the sum of the weight of the connector 23 and the bottom plate 22 is smaller than the weight of the bottom plate 22 that does not originally have the connection hole 221. Therefore, the weight of the battery can be reduced and the production cost of the battery can be reduced by arranging the plurality of connectors 23 at intervals.

[0045] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments, the cover plate assembly includes an insulating member 30. The insulating member 30 is located in the connection hole 221 and is arranged around the pole body 21. The insulating member 30 is respectively connected to the pole body 21 and the bottom plate 22, and covers a plurality of connectors 23. When an overcurrent occurs in the battery, the temperature of the connector 23 as a safety structure will rise until it melts, thereby achieving a power-off effect and ensuring the safety of the battery. The insulating member 30 can generally be formed by injection molding. Through the setting of the insulating member 30, it is located in the connection hole 221 and covers a plurality of connectors 23. When the temperature of the connector 23 rises, the part of the insulating member 30 in contact with the connector 23 will melt. The melted part of the insulating member 30 can wrap the connector 23 after the melt, which can prevent the slag of the connector 23 after the melt from connecting again. That is, the melted part of the insulating member 30 wraps and isolates the fuse of the connector 23, so as to prevent the fuse position of the connector 23 from being reconnected, thereby further improving the safety of the battery structure. At the same time, since the insulating member 30 is disposed in the connection hole 221 and is generally made of insulating materials such as rubber and plastic, it is light in weight and does not increase the weight of the original battery structure. Due to the material, after the insulating member 30 is disposed, the weight is reduced compared to the existing battery structure.

[0046] See also Figure 1 , Figure 2 , Figure 3 and Figure 4In some embodiments, the insulating member 30 has a plurality of receiving holes 31 connected to the connecting hole 221, and the plurality of receiving holes 31 are arranged at intervals along the circumference of the insulating member 30, and each connecting member 23 is provided in one receiving hole 31. In order to facilitate the insulating member 30 to cover the plurality of connecting members 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 connecting members 23 in the connecting hole 221, a plurality of receiving holes 31 corresponding to the connecting members 23 will be formed on the insulating member 30 after injection molding, and the inner wall of the receiving hole 31 is in contact with the surface of the connecting member 23, so that the heat on the connecting member 23 is conveniently transferred to the insulating member 30, so that the portion of the insulating member 30 in contact with the connecting member 23 is melted. After the connecting member 23 is melted, the melted portion of the insulating member 30 can quickly fill the position where the connecting member 23 is melted, thereby preventing the position where the connecting member 23 is melted from being reconnected. When an overcurrent occurs, the connector 23 can be effectively ensured to be melted, thereby breaking the current circuit and ensuring the safety of the battery.

[0047] See also Figure 4 , Figure 5 and Figure 6 In some embodiments, along the width direction Y of the connector 23 (the width direction Y intersects with the thickness direction X, preferably, the width direction Y is perpendicular to the thickness direction X), the connector 23 has a first side wall 231 and a second side wall 232 that are arranged opposite to each other, the first side wall 231 is connected to the pole body 21 and the bottom plate 22 respectively, the second side wall 232 is connected to the pole body 21 and the bottom plate 22 respectively, and the plane where the first side wall 231 is located intersects with the plane where the second side wall 232 is located. That is to say, the connector 23 is arranged to be similar to an isosceles trapezoid structure, in the width direction of the connector 23, the plane where the first side wall 231 is located intersects with the plane where the second side wall 232 is located (or the extension direction of the first side wall 231 intersects with the extension direction of the second side wall 232), and the width of the connector 23 is generally 0.5 mm to 3 mm, that is, when the connector 23 is arranged, the spacing between the first side wall 231 and the second side wall 232 in the width direction ranges from 0.5 mm to 3 mm. The width of the connecting member 23 can be any value among 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, or a range between any two values.

[0048] The pole 20 satisfies: S = πamhn / 360°; wherein S is the total flow area of ​​the connector 23. When designing the capacity of the battery, the flow capacity of a conductive material is determined (the flow capacity refers to the maximum tolerable current value set for the current situation during the design and manufacturing process of the battery). The flow area of ​​the material can be obtained through the flow capacity and the flow coefficient of the corresponding material. Corresponding to the connector 23, the flow area refers to the total area through which the current passes on the connector 23. m is the angle between the plane where the first side wall 231 is located and the plane where the second side wall 232 is located, and the angle can be obtained by a tool for measuring angles such as a protractor. a is the maximum diameter of the pole body 21, and h is the thickness of the connector 23. The maximum diameter of the pole body 21 and the thickness of the connector 23 can be measured using a vernier caliper, a micrometer or other measuring tool. n is the number of connectors 23.

[0049] Since the connecting member 23 is connected between the pole body 21 and the bottom plate 22, and the bottom plate 22 is arranged around the pole body 21, the connecting member 23 is generally arranged in a trapezoidal structure (such as Figure 5 and Figure 6 ), such a structural design is convenient for processing and installation. Under the condition of meeting the corresponding flow capacity requirements, that is, the flow area is determined, the number of connectors 23 can be quickly set by the formula S=πamhn / 360°, thereby improving the design efficiency of the cover assembly, eliminating the need for repeated tests on the structure, and shortening the design cycle of the structure.

[0050] See also 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 side wall 231 and a second side wall 232 that are arranged opposite to each other, the first side wall 231 is connected to the pole body 21 and the bottom plate 22 respectively, the second side wall 232 is connected to the pole body 21 and the bottom plate 22 respectively, and the plane where the first side wall 231 is located is parallel to the plane where the second side wall 232 is located. That is to say, the connector 23 is arranged in a structure similar to a rectangle, in the width direction of the connector 23, the plane where the first side wall 231 is located is parallel to the plane where the second side wall 232 is located (or the extension direction of the first side wall 231 is parallel to the extension direction of the second side wall 232), and the width of the connector 23 is generally 0.5 mm to 3 mm, that is, when the connector 23 is arranged, the spacing between the first side wall 231 and the second side wall 232 in the width direction ranges from 0.5 mm to 3 mm. The width of the connecting member 23 can be any value among 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, or a range between any two values.

[0051] The pole 20 satisfies: S=bhn; where S is the total flow area of ​​the connector 23. When designing the capacity of the battery, the flow capacity of a conductive material is determined (the flow capacity refers to the maximum current value that can be tolerated set for the current situation during the design and manufacturing process of the battery). The flow area of ​​the material can be obtained through the flow capacity and the flow coefficient of the corresponding material. Corresponding to the connector 23, the flow area refers to the total area through which the current passes on the connector 23. b is the width of the connector 23, and h is the thickness of the connector 23. The width and thickness of the connector 23 can be measured using measuring tools such as a vernier caliper and a micrometer. n is the number of connectors 23.

[0052] Since the connecting member 23 is connected between the pole body 21 and the bottom plate 22, and the bottom plate 22 is arranged around the pole body 21, the connecting member 23 is generally arranged in a rectangular structure (such as Figure 7 and Figure 8 ), such a structural design is convenient for processing and installation. Under the condition of meeting the corresponding flow capacity requirements, that is, the flow area is determined, the number of connectors 23 can be quickly set by the formula S=bhn, thereby improving the design efficiency of the cover assembly, eliminating the need for repeated tests on the structure, and shortening the design cycle of the structure.

[0053] See also Figure 4 In some embodiments, in the thickness direction X of the bottom plate 22, the maximum dimension of the bottom plate 22 is H, that is, the thickness of the bottom plate 22 is H, and the maximum dimension of the connector 23 is h, that is, the thickness of the connector 23 is h, which satisfies: 1 / 2≤h / H≤2 / 3. When the connector 23 is arranged in the connecting hole 221, preferably, the thickness of the connector 23 is less than the thickness of the bottom plate 22, and the upper surface of the connector 23 is lower than the upper surface of the bottom plate 22, and the lower surface of the connector 23 is higher than the lower surface of the bottom 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 bottom plate 22. When the connector 23 is provided, its width is generally 0.5 mm to 3 mm. The thickness of the connector 23 is different according to the thickness of the pole bottom plate 22. At present, the thickness of the pole bottom plate 22 is generally 1 mm to 3 mm, so the thickness of the connector 23 is generally 1 / 2 to 2 / 3 of the thickness of the pole bottom plate 22. When the insulating member 30 is provided, the upper and lower surfaces of the insulating member 30 can be flush with the upper and lower surfaces of the bottom plate 22, so that the insulating member 30 can cover multiple connectors 23, and the melted part can also fill the position where the connector 23 is fused. At the same time, the insulating member 30 is located in the connection hole 221, and will not affect the structure outside the connection hole 221.

[0054] See also Figure 1 and Fig. 9In some embodiments, the pole 20 includes a welding portion 24, which is located on the side of the bottom plate 22 away from the cover body 10. The welding portion 24 is connected to the bottom plate 22 and is arranged around the connection hole 221. The welding portion 24 is configured to electrically connect the pole 20 to the pole lug. The current is transmitted between the pole 20 and the pole lug. In order to facilitate the connection between the pole 20 and the pole lug, the connection position can be set on the side of the bottom plate 22 of the pole 20 away from the cover body 10, that is, the pole lug is connected to the side of the bottom plate 22 close to the pole lug itself, so that the pole lug can be set to a smaller length, and the electrical connection with the pole 20 can be achieved. The pole 20 and the pole lug are connected through the welding portion 24, and the current between the two is also transmitted through the welding portion 24. The welding portion 24 is connected to the bottom plate 22 around the connection hole 221, so that the current transmitted between the pole lug and the pole 20 can be uniformly passed through multiple connectors 23. By making the current density of each connector 23 the same, the temperature on each connector 23 can be made to be roughly the same. When an overcurrent occurs in the battery, each connector 23 can be melted in a similar time, avoiding the situation where some connectors 23 are melted while others are not. This can also improve the safety of the battery to a certain extent.

[0055] See also Figure 1 and Fig.10 In some embodiments, the welding portion 24 includes a plurality of welding bodies 241 arranged at intervals, and the plurality of welding bodies 241 are all connected to the bottom plate 22 and surround the connection hole 221, and the plurality of welding bodies 241 are all electrically connected to the corresponding tab. While the welding portion 24 is arranged around the connection hole 221, it can be arranged as a plurality of welding bodies 241 spaced apart from each other. This arrangement can also make the current pass through the plurality of connectors 23 more evenly, ensuring that the temperature of the connectors 23 is roughly the same, and at the same time can also reduce the material used in the welding portion 24, thereby reducing the processing cost of the battery.

[0056] A single cell battery comprises the above-mentioned cover plate assembly, a shell and an electrode assembly. The shell has a mounting cavity and an opening connected to the mounting cavity, and the cover plate assembly seals the opening. The electrode assembly is arranged in the mounting cavity, and the pole lug on the electrode assembly is electrically connected to the pole 20 of the cover plate assembly.

[0057] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0058] The cover plate assembly and single cell provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: include: The cover body has a mounting hole; A pole, the pole comprising a pole body, a base plate and a connector, the pole body being passed through the mounting hole and connected to the cover body, the base plate being located on one side of the cover body and having a connecting hole, at least a portion of the pole body being located in the connecting hole and spaced apart from the base plate, the connector being located in the connecting hole, and the pole body being electrically connected to the base plate via the connector.

2. The cover plate assembly according to claim 1, characterized in that: The pole includes a plurality of connecting members, and the plurality of connecting members are arranged at intervals around the pole body.

3. The cover plate assembly according to claim 2, characterized in that: The cover plate assembly comprises: The insulating member is located in the connecting hole and is arranged around the pole body. The insulating member is respectively connected to the pole body and the bottom plate and covers a plurality of the connecting members.

4. The cover plate assembly according to claim 3, characterized in that: The insulating member has a plurality of accommodating holes communicated with the connecting hole. The plurality of accommodating holes are arranged at intervals along the circumference of the insulating member, and each of the connecting members is passed through one of the accommodating holes.

5. The cover plate assembly according to claim 1, characterized in that: Along the width direction of the connecting member, the connecting member includes a first side wall and a second side wall arranged opposite to each other, the first side wall is respectively connected to the pole body and the bottom plate, the second side wall is respectively connected to the pole body and the bottom plate, and the plane where the first side wall is located intersects with the plane where the second side wall is located; the pole satisfies: S = πamhn / 360°; Among them, S is the total flow area of ​​the connecting piece, m is the angle between the plane where the first side wall is located and the plane where the second side wall is located, a is the maximum diameter of the pole body, h is the thickness of the connecting piece, and n is the number of the connecting pieces.

6. The cover plate assembly according to claim 1, characterized in that: Along the width direction of the connecting member, the connecting member includes a first side wall and a second side wall arranged opposite to each other, the first side wall is respectively connected to the pole body and the bottom plate, the second side wall is respectively connected to the pole body and the bottom plate, and the plane where the first side wall is located is parallel to the plane where the second side wall is located; the pole satisfies: S = bhn; Wherein, S is the total flow area of ​​the connecting member, b is the width of the connecting member, h is the thickness of the connecting member, and n is the number of the connecting members.

7. The cover plate assembly according to claim 1, characterized in that: In the thickness direction of the bottom plate, the maximum dimension of the bottom plate is H, and the maximum dimension of the connecting member is h, satisfying: 1 / 2≤h / H≤2 / 3.

8. The cover plate assembly according to claim 1, characterized in that: The pole includes a welding portion located on a side of the bottom plate away from the cover plate body, the welding portion is connected to the bottom plate and arranged around the connecting hole, and the welding portion is configured to electrically connect the pole to the pole lug.

9. The cover plate assembly according to claim 8, characterized in that: The welding portion includes a plurality of welding bodies arranged at intervals, the plurality of welding bodies are all connected to the bottom plate and surround the connection hole, and the plurality of welding bodies are all electrically connected to the corresponding tabs.

10. A single cell battery, characterized in that: include: The cover plate assembly according to any one of claims 1 to 9, and A housing, wherein the housing has a mounting cavity and an opening communicating with the mounting cavity, and the cover assembly covers the opening; The electrode assembly is disposed in the mounting cavity and is electrically connected to the pole of the cover plate assembly.

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