Cylindrical battery cover plate, single battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a cylindrical battery cover plate, a single battery and electric equipment. The cylindrical battery cover plate comprises a cover plate body, the cover plate body comprises a cover plate top layer and a cover plate bottom layer, the cover plate top layer is located above the cover plate bottom layer, the cover plate top layer is of a plate structure made of aluminum and used for being welded to a busbar, and the cover plate bottom layer is of a plate structure made of steel. The cover plate bottom layer is used for being welded to a battery shell of the single battery. Compared with a stainless steel battery cover plate in the prior art, the battery cover plate disclosed by the utility model has the advantages that the surface of the battery cover plate is made of aluminum, and the melting point is consistent when the battery cover plate is welded with the busbar, so that the welding stability and safety of the busbar are improved, the welding yield of the cylindrical battery cover plate and the busbar is improved, and the safety and reliability of the cylindrical battery are further improved; and meanwhile, the welding efficiency of cover plate production and manufacturing can be effectively improved, and the method is particularly suitable for the field of power lithium batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery cover, a single battery and electrical equipment. Background Art

[0002] Batteries, as energy storage units, are increasingly being used in the electric vehicle and energy storage industries. Battery packaging designs are categorized into three types: prismatic, soft-pack, and cylindrical. With the rapid development of the lithium battery industry, cylindrical battery manufacturing processes have matured and become more versatile, leading to their increasing use.

[0003] When stainless steel cylindrical batteries are assembled, busbars are used to connect the individual cells in series and parallel. The cylindrical battery cover is used to mount components such as the terminal. The busbars are typically made of aluminum, welded to the terminal at one end and to the stainless steel casing at the other. Due to the significant difference in melting points between aluminum and steel, welding is difficult, resulting in a high rate of defective welds, the risk of cold or broken welds, poor stability, and potential safety hazards.

[0004] Therefore, there is an urgent need to provide a new cylindrical battery cover, single battery and electrical equipment to solve the above technical problems in the prior art. Utility Model Content

[0005] One purpose of the utility model is to provide a cylindrical battery cover plate, which improves the stability and safety of busbar welding, thereby improving the safety and reliability of battery use.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A cylindrical battery cover includes a cover body, wherein the cover body includes a top cover layer and a bottom cover layer, and the top cover layer is located above the bottom cover layer. The top cover layer is a plate structure made of aluminum material, and the top cover layer is used for welding to the busbar. The bottom cover layer is a plate structure made of steel material, and the bottom cover layer is used for welding to the battery shell of the single cell.

[0008] As a preferred technical solution for the cylindrical battery cover, the cover body is formed by stamping a steel-aluminum composite plate.

[0009] As a preferred technical solution for the above cylindrical battery cover, the shear strength of the composite surface of the cover top layer and the cover bottom layer is not less than 60 MPa.

[0010] As a preferred technical solution for the above cylindrical battery cover, the peel strength of the composite surface of the cover top layer and the cover bottom layer is not less than 20N / mm.

[0011] As a preferred technical solution for the above cylindrical battery cover, the thickness of the top layer of the cover is greater than the thickness of the bottom layer of the cover.

[0012] As a preferred technical solution for the above cylindrical battery cover, the diameter of the top layer of the cover is larger than the diameter of the bottom layer of the cover, so as to form a mounting step at the outer edge of the cover body.

[0013] Another object of the present invention is to provide a single battery, which includes a battery shell and a cylindrical battery cover as described in any of the above solutions, wherein the bottom layer of the cover body is welded to the battery shell.

[0014] As a preferred technical solution for the above-mentioned single battery, the diameter of the top layer of the cover plate is equal to the outer diameter of the battery housing.

[0015] As a preferred technical solution for the above-mentioned single battery, the diameter of the bottom layer of the cover plate is larger than the inner diameter of the battery housing.

[0016] Another object of the present invention is to provide an electrical device comprising a plurality of single cells as described in any of the above solutions.

[0017] Beneficial effects:

[0018] The cylindrical battery cover plate disclosed in the present invention comprises a cover plate body, which comprises a top cover plate and a bottom cover plate, with the top cover plate positioned above the bottom cover plate. The top cover plate is a plate structure made of aluminum and is used for welding to the busbar, while the bottom cover plate is a plate structure made of steel and is used for welding to the battery casing of the single cell. Compared to the stainless steel battery cover plates in the prior art, the battery cover plate disclosed in the present invention has an aluminum surface, which has the same melting point as the busbar when welded, improving the stability and safety of the busbar welding, thereby increasing the yield rate of welding the cylindrical battery cover plate to the busbar, and further improving the safety and reliability of the cylindrical battery. It also effectively improves the welding efficiency of the cover plate manufacturing, making it particularly suitable for application in the field of power lithium batteries.

[0019] The single cell battery of the present invention comprises a battery housing and the cylindrical battery cover plate as described above, wherein the bottom layer of the cover plate body is welded to the battery housing. The single cell battery has a high welding yield and is safe and reliable in use.

[0020] The electric device of the utility model comprises a plurality of the above-mentioned single batteries and has high safety and reliability in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a single battery provided by a specific embodiment of the utility model;

[0022] Figure 2 It is a longitudinal cross-sectional view of a single cell provided in a specific embodiment of the present utility model;

[0023] Figure 3 It is a longitudinal cross-sectional view of a portion of the structure of a single cell provided in a specific embodiment of the present utility model;

[0024] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0025] In the picture:

[0026] 100, cylindrical battery cover; 110, cover top layer; 120, cover bottom layer;

[0027] 200, battery housing;

[0028] 300. Pole. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0035] refer to Figures 1 to 4 As shown, this embodiment provides a cylindrical battery cover 100, which includes a cover body, a pole 300 mounting hole is provided on the cover body, and the pole 300 is passed through the pole mounting hole. The cover body includes a cover top layer 110 and a cover bottom layer 120, and the cover top layer 110 is located above the cover bottom layer 120. The cover top layer 110 is a plate structure made of aluminum material, and the cover top layer 110 is used for welding to the bus bar. The cover bottom layer 120 is a plate structure made of steel material, and the cover bottom layer 120 is used for welding to the battery shell 200 of the single cell.

[0036] Compared with the battery cover made of stainless steel in the prior art, the surface of the battery cover in this embodiment is made of aluminum, which has the same melting point as the busbar during welding, thereby improving the stability and safety of the busbar welding, thereby improving the yield of the welding between the cylindrical battery cover 100 and the busbar, and further improving the safety and reliability of the cylindrical battery; at the same time, it can also effectively improve the welding efficiency of the cover production and manufacturing, and is particularly suitable for application in the field of power lithium batteries.

[0037] The cover plate body in this embodiment is formed by stamping a steel-aluminum composite plate in one step. Stamping can ensure the consistency and stability of the cover plate body processing and improve production efficiency.

[0038] To ensure operational stability and reliability, the shear strength of the composite surface of the top cover panel 110 and the bottom cover panel 120 must be no less than 60 MPa. The peel strength of the composite surface of the top cover panel 110 and the bottom cover panel 120 must be no less than 20 N / mm. The specific shear and peel strengths can be designed based on actual conditions and are not specifically limited in this embodiment.

[0039] Optionally, the thickness of the top cover plate 110 is greater than the thickness of the bottom cover plate 120. This structural design can ensure the connection strength and connection reliability of the cylindrical battery cover plate 100 and the busbar welding connection.

[0040] The thickness of the top cover plate 110 ranges from 0.4 mm to 1.0 mm, for example, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. The thickness of the bottom cover plate 120 ranges from 0.2 mm to 0.4 mm, for example, 0.2 mm, 0.3 mm, or 0.4 mm. It will be appreciated that the specific thicknesses of the top cover plate 110 and the bottom cover plate 120 can be designed based on actual needs and are not specifically limited in this embodiment.

[0041] The diameter of the top cover plate 110 is larger than the diameter of the bottom cover plate 120 to form a mounting step at the outer edge of the cover plate body, which facilitates assembly with the battery housing 200 of the single cell and improves the connection stability between the cylindrical battery cover plate 100 and the battery housing 200.

[0042] Return Reference Figure 1 and Figure 2 This embodiment further provides a single cell, comprising the cylindrical battery cover 100 as described in any of the above-mentioned solutions. This single cell utilizes the cylindrical battery cover 100, thereby achieving all the beneficial effects of the cylindrical battery cover 100 described in any of the above-mentioned solutions, particularly improving the stability and safety of busbar welding, thereby increasing the welding yield of the cylindrical battery cover 100 to the busbar, and thereby improving the reliability and safety of the single cell.

[0043] Furthermore, the above-mentioned single cell also includes a battery housing 200, and the cover plate bottom layer 120 of the above-mentioned cover plate body is welded to the battery housing 200. In this embodiment, the cover plate bottom layer 120 is a plate structure made of steel, specifically stainless steel, and the battery housing 200 of the single cell is also made of stainless steel. Therefore, the welded connection between the cover plate bottom layer 120 and the battery housing 200 is highly reliable, and the safety of the single cell is high.

[0044] The diameter of the top cover plate 110 is equal to the outer diameter of the battery housing 200. After assembly, the outer circumferences of the cylindrical battery cover plate 100 and the battery housing 200 are coplanar, with a beautiful appearance and good integrity.

[0045] Since the outer edge of the cover body is provided with a mounting step, the top of the battery shell 200 is provided with a step surface, which cooperates with the mounting step of the outer edge of the cover body. To achieve this structure, on the basis of the above structure, the diameter of the cover bottom layer 120 is larger than the inner diameter of the battery shell 200. Thus, a mounting step is formed between the cover bottom layer 120 and the cover top layer 110, which is assembled and welded with the step surface of the battery shell 200, thereby improving the connection stability of the cylindrical battery cover 100 and the battery shell 200.

[0046] This embodiment further provides an electrical device comprising a plurality of single cells as described in any of the above-described embodiments. The electrical device may be a battery module, battery pack, electric vehicle, electric bicycle, electric motorcycle, ship, energy storage system, or the like. This embodiment is not particularly limited to any specific embodiment, as long as the single cells described above are used for power supply or energy storage. By using the single cells described above, the electrical device possesses all the benefits of the single cells described in any of the above-described embodiments, which will not be further elaborated here.

[0047] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Cylindrical battery cover, characterized in that: The invention comprises a cover plate body, wherein the cover plate body comprises a cover plate top layer (110) and a cover plate bottom layer (120), wherein the cover plate top layer (110) is located above the cover plate bottom layer (120), the cover plate top layer (110) is a plate structure made of aluminum material, and the cover plate top layer (110) is used for welding to a bus bar, and the cover plate bottom layer (120) is a plate structure made of steel material, and the cover plate bottom layer (120) is used for welding to a battery housing (200) of a single battery.

2. The cylindrical battery cover according to claim 1, characterized in that: The cover plate body is formed by stamping a steel-aluminum composite plate.

3. The cylindrical battery cover according to claim 2, characterized in that: The shear strength of the composite surface of the cover plate top layer (110) and the cover plate bottom layer (120) is not less than 60 MPa.

4. The cylindrical battery cover according to claim 1, characterized in that: The peeling strength of the composite surface of the cover plate top layer (110) and the cover plate bottom layer (120) is not less than 20 N / mm.

5. The cylindrical battery cover according to claim 4, characterized in that: The thickness of the top cover plate layer (110) is greater than the thickness of the bottom cover plate layer (120).

6. The cylindrical battery cover according to claim 4, characterized in that: The diameter of the top layer (110) of the cover plate is greater than the diameter of the bottom layer (120) of the cover plate, so as to form a mounting step at the outer edge of the cover plate body.

7. A single battery, comprising a battery housing (200), characterized in that: The single battery further comprises a cylindrical battery cover according to any one of claims 1 to 6, and the cover bottom layer (120) of the cover body is welded to the battery housing (200).

8. The single cell according to claim 7, characterized in that: The diameter of the top layer (110) of the cover plate is equal to the outer diameter of the battery housing (200).

9. The single cell according to claim 7, characterized in that: The diameter of the cover plate bottom layer (120) is greater than the inner diameter of the battery housing (200).

10. Electrical equipment, characterized in that: The method comprises a plurality of single cells according to any one of claims 7 to 9.

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