Cylindrical battery collector plate structure and battery
By setting first and second welding zones in the cylindrical battery current collector structure and changing the connection method, the wear and leakage problems at the connection between the negative current collector and the casing were solved, improving the cell's overcurrent capacity and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2026-03-13
AI Technical Summary
Existing cylindrical batteries are prone to wear and dimensional abnormalities at the connection between the negative electrode current collector and the casing, which can lead to cell leakage and pose a safety risk.
A cylindrical battery current collector structure is designed. The current collector body has first and second welding areas. The first welding area is welded to the core, and the second welding area is welded to the shell. The two have a height difference along the longitudinal direction and are laser welded. The connection method is changed to increase the welding area and reduce the risk of leakage.
By increasing the welding area and changing the connection method, the current carrying capacity of the battery cell was improved, the risk of battery cell leakage was reduced, and safety was enhanced.
Smart Images
Figure CN223993378U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of batteries, and in particular to a cylindrical battery current collector structure and battery. Background Technology
[0002] With the increasing penetration rate of new energy electric vehicles, electric vehicles using cylindrical cells are gradually attracting user attention. The design schemes of cylindrical cells vary. Taking the output end of a cylindrical cell as an example, on the positive side, the terminal is fixed and connected to the current collector by welding the terminal post to the current collector. On the negative side, the negative current collector is fixed and connected to the casing by welding the negative current collector to the casing. The main welding methods include lap welding and through welding. The specific connection method needs to be determined according to the cell structure scheme.
[0003] The connection method of the negative output terminal of a cylindrical battery cell mainly consists of a negative current collector and a housing.
[0004] The specific connection steps are as follows:
[0005] Step 1: Perform penetration welding between the core and the negative electrode current collector. The welding area is as follows: Figure 1 The core welding area,
[0006] Step 2: Perform penetration welding on the negative electrode current collector and the housing. The welding area is as follows: Figure 1 The welded area of the shell;
[0007] In step 2, a certain distance will be set between the collector plate and the housing opening (e.g., Figure 2 However, if the tooling wears out during use or the dimensions of the incoming core material are abnormal, the distance at this point will fluctuate abnormally. This can lead to leakage of the battery cell during subsequent use, posing a safety risk. Utility Model Content
[0008] In response to the aforementioned problems with existing battery cells, this paper aims to provide a cylindrical battery current collector structure and battery that improves current carrying capacity and reduces the risk of cell leakage.
[0009] The specific technical solution is as follows:
[0010] A cylindrical battery current collector structure includes: a current collector body, the current collector body having a first welding area and a second welding area, both the first welding area and the second welding area being planar, the first welding area being used for welding with a core, and the second welding area surrounding the first welding area being used for welding with a casing.
[0011] As a further improvement and optimization of this solution, the first welding area and the second welding area have a height difference along the longitudinal direction.
[0012] As a further improvement and optimization of this solution, the height difference is H, where 0mm≤H≤1.5mm.
[0013] As a further improvement and optimization of this solution, the capacity of the battery is E, where 28ah ≤ E ≤ 45ah.
[0014] As a further improvement and optimization of this scheme, 18.7≤E / H≤45.
[0015] As a further improvement and optimization of this solution, both the first welding area and the second welding area have multiple welding lines.
[0016] A battery includes any one of the cylindrical battery current collector structures described above, and further includes: a housing and a core, wherein the housing is welded to a second welding area, the core is welded to a first welding area, and the welding direction of the housing to the second welding area and the welding direction of the core to the first welding area are both perpendicular to the plane where the first welding area / second welding area is located.
[0017] As a further improvement and optimization of this solution, the housing has an opening.
[0018] As a further improvement and optimization of this solution, the shell is a one-piece molded structure.
[0019] As a further improvement and optimization of this solution, laser welding is used between the shell and the second welding area, and between the core and the first welding area.
[0020] The positive effects of the above technical solution compared with the existing technology are:
[0021] (1) In this utility model, the welding part between the negative current collector body and the shell is changed from the folded edge of the current collector body to the plane of the outermost ring of the current collector body (second welding area), which changes the connection structure between the shell and the negative current collector body, increases the welding area between the negative current collector body and the shell, and improves the current carrying capacity of the battery cell.
[0022] (2) In this utility model, the welding method is changed from the negative electrode current collector body passing through the shell wall to the shell wall passing through the negative electrode current collector body. This changes the connection method between the shell and the negative electrode current collector body, eliminates the size of the negative electrode current collector body and the shell opening, and reduces the risk of cell leakage. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the negative electrode current collector in the prior art;
[0024] Figure 2 This is a schematic diagram illustrating the connection between the negative current collector, the winding core, and the housing in the prior art.
[0025] Figure 3 This is a schematic diagram of the connection between the housing and the cover plate in the prior art;
[0026] Figure 4 This is a top view of a cylindrical battery current collector structure and the current collector body of the battery according to the present invention.
[0027] Figure 5 This is a side sectional view of a cylindrical battery current collector structure and the current collector body of the battery according to the present invention.
[0028] Figure 6 This is a schematic diagram of a cylindrical battery current collector structure and the connection between the current collector body, the core, and the shell of the battery according to the present invention.
[0029] In the attached diagram: 1. Collector plate body; 2. Core; 3. Shell; 11. First welding area; 12. Second welding area. Detailed Implementation
[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] Figure 1This is a schematic diagram of the negative electrode current collector in the prior art. Figure 2 This is a schematic diagram illustrating the connection between the negative electrode current collector, the winding core, and the housing in the prior art. Figure 3 This is a schematic diagram of the connection between the shell and the cover plate in the prior art. Figure 4 This is a top view of a cylindrical battery current collector structure and the current collector body of the battery according to the present invention. Figure 5 This is a side sectional view of a cylindrical battery current collector structure and the current collector body of the battery according to the present invention. Figure 6 This is a schematic diagram illustrating the structure of a cylindrical battery current collector and the connection between the current collector body, the winding core, and the housing of the battery, as per this utility model. Figure 1-6 As shown, a preferred embodiment of a cylindrical battery current collector structure is illustrated, comprising: a current collector body 1, the current collector body 1 having a first welding area 11 and a second welding area 12, both the first welding area 11 and the second welding area 12 being planar, the first welding area 11 being used for welding with the core 2, and the second welding area 12 being disposed outside the first welding area 11 and used for welding with the housing 3.
[0034] In this embodiment, the welding point between the negative current collector body 1 and the housing 3 is changed from the folded edge of the current collector body 1 to the outermost plane of the current collector body 1 (second welding area 12). This changes the connection structure between the housing 3 and the negative current collector body 1, increases the welding area between the negative current collector body 1 and the housing 3, and improves the current carrying capacity of the battery cell.
[0035] Even better, the shell 3 is made of materials such as steel and aluminum.
[0036] Furthermore, as a preferred embodiment, the first welding area 11 and the second welding area 12 have a height difference along the longitudinal direction to ensure residual space inside the battery cell casing.
[0037] Furthermore, as a preferred embodiment, the height difference is H, where 0mm ≤ H ≤ 1.5mm.
[0038] Furthermore, as a preferred embodiment, the battery capacity is E, where 28ah ≤ E ≤ 45ah.
[0039] Furthermore, as a preferred embodiment, 18.7 ≤ E / H ≤ 45.
[0040] Furthermore, as a preferred embodiment, both the first welding area 11 and the second welding area 12 have multiple welding lines, which can effectively increase the current-carrying area of the battery cell and improve the fast-charging capability of the battery cell.
[0041] A battery includes any of the above-mentioned cylindrical battery current collector structures, and further includes: a housing 3 and a core 2, wherein the housing 3 is welded to a second welding area 12, the core 2 is welded to a first welding area 11, and the welding direction of the housing 3 to the second welding area 12 and the welding direction of the core 2 to the first welding area 11 are both perpendicular to the plane where the first welding area 11 / second welding area is located.
[0042] In this embodiment, the welding method is changed from the negative electrode current collector body 1 passing through the shell wall to the shell wall passing through the negative electrode current collector body 1. This changes the connection method between the shell 3 and the negative electrode current collector body 1, eliminates the size of the negative electrode current collector body 1 and the shell opening, and reduces the risk of cell leakage.
[0043] Furthermore, as a preferred embodiment, the housing 3 has an opening, which forms a weak area. When subjected to excessive force, it will crack, thus functioning as an explosion-proof valve. In this embodiment, the housing and cover are integrated into one body to form the housing 3, eliminating the separate structural design of the cover plate.
[0044] Furthermore, as a preferred embodiment, the housing 3 is a one-piece molded structure.
[0045] Furthermore, as a preferred embodiment, laser welding is used between the shell 3 and the second welding area 12, and between the core 2 and the first welding area 11.
[0046] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A cylindrical battery current collector structure, characterized by, The application relates to a cylindrical battery current collector plate structure, which comprises the following: a current collector plate body, which is provided with a first welding area and a second welding area, and the first welding area and the second welding area are both flat surfaces, the first welding area is used for welding with a winding core, and the second welding area is arranged outside the first welding area and is used for welding with a shell.
2. The cylindrical battery current collector structure according to claim 1, wherein The first welding area and the second welding area have a height difference in the longitudinal direction.
3. The cylindrical battery current collector structure of claim 2, wherein, The height difference is H, and 0mm<=H<=1.5mm.
4. The cylindrical battery current collector structure of claim 1, wherein, The capacity of the battery is E, and 28ah<=E<=45ah.
5. The cylindrical battery current collector structure of claim 4, wherein, 18.7<=E / H<=45.
6. The cylindrical battery current collector structure of claim 1, wherein, The first welding area and the second welding area are both provided with a plurality of welding lines.
7. A battery, characterized by The cylindrical battery current collector plate structure according to any one of claims 1-6 further comprises a shell and a winding core, the shell is welded with the second welding area, the winding core is welded with the first welding area, and the welding direction of the shell and the second welding area and the welding direction of the winding core and the first welding area are both perpendicular to the plane where the first welding area / second welding area is located.
8. The battery of claim 7, wherein the battery is a lithium ion battery. The shell is provided with an opening.
9. The battery of claim 8, wherein the battery is a lithium ion battery. The shell is an integrally formed structure.
10. The battery of claim 7, wherein Laser welding is adopted between the shell and the second welding area and between the winding core and the first welding area.