Full-tab structure of large cylindrical battery and cylindrical battery
Through the design of layering reinforcement materials in the polar ear reinforcement area, the complex process and welding reliability problems of the all-pole ear structure are solved, and the strength enhancement of the polar ear and welding reliability are achieved to meet the needs of fast charging.
Patent Information
- Application Number
- CN202422148418.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-03
AI Technical Summary
The existing all-pole ear structure requires stacking processing, the process is complicated, it is difficult to meet the overcurrent and overheating requirements of 4-6C fast charging, and the welding reliability is insufficient.
A large cylindrical battery full-electrode ear structure is designed, and reinforcement materials are placed in the reinforcement area of the electrode ear to maintain strength after winding and expose the edges, simplifying the process and facilitating welding.
It achieves enhanced strength of extreme ears, improved welding reliability, simplified process, and meets the needs of 4-6C fast charging.
Smart Images
Figure CN223066416U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, and particularly to a full-tab structure of a large cylindrical battery and a cylindrical battery. Background Art
[0002] Commercial lithium-ion batteries can be divided into three categories according to the packaging form: square, cylindrical, and soft-pack; among them, the mainstream models of cylindrical batteries are 18650 and 21700, which are mainly used in 3C, power tools, and small-scale battery electric vehicles. Their tabs are generally single tabs or double tabs. Because of their small single-cell capacity, even a 20C current is within 100A, and single tabs or double tabs can meet the overcurrent requirements. However, their small size results in disadvantages such as small capacity, many structural parts, and low energy density when applied to new energy vehicles. Square and soft-pack batteries are mainly used in new energy vehicles and energy storage fields. Their tabs are multi-tabs, and the form is that multiple tabs are stacked in the thickness direction. The charging method is mainly slow charging, and the charging rate is below 0.5C. In recent years, with the development of battery technology, the charging rate has also made great progress, rapidly developing from 1C to 2C. However, even at a 2C rate, the charging time is as long as 30 minutes, which is far lower than the 10-minute charging time of traditional fuel vehicles, making customers of new energy vehicles still have range anxiety and charging anxiety, affecting the long-term development of new energy vehicles.
[0003] At present, to shorten the charging time of new energy vehicles, only the charging speed can be increased. A fast charge of 4-6C can make the charging time similar to that of traditional fuel vehicles. For a fast charge of 4C-6C, the insufficient overcurrent and overheat capabilities of traditional single tabs and multi-tabs are one of the bottlenecks for realizing fast charging. The full tab has good overcurrent and overheat capabilities. The existing full tabs mainly adopt the cutting and stacking method, which requires different degrees of trimming and flattening treatment for the inner and outer tabs, and then welding, with complex processes. Summary of the Utility Model
[0004] Aiming at the above deficiencies of the prior art, the technical problem to be solved by the utility model is: how to provide a full-tab structure and a cylindrical battery with reasonable structural design, without cutting and stacking, which is beneficial to simplify the process and facilitate welding.
[0005] To solve the above technical problems, the utility model adopts the following technical scheme:
[0006] A full-tab structure of a large cylindrical battery, characterized in that it includes a pole piece, one side of the pole piece is connected with a tab extending along the length direction, at least one side of the tab is provided with a strengthening area, and a strengthening material is attached in a layer-by-layer manner in the strengthening area. The strengthening material is filled between adjacent layers of the tabs, and the filling height is lower than the height of the tabs.
[0007] In this way, by laminating and arranging the reinforcing material in the reinforcing area layer, the reinforcing material is filled between the wound tabs, thereby enhancing the strength of the tabs. Without cutting and overlapping the tabs, the tabs can maintain sufficient strength, facilitating the welding of the bus bar. Additionally, since the filling height of the reinforcing material is lower than the height of the tabs, the edges of the tabs are fully exposed, ensuring the reliability of welding.
[0008] Furthermore, the width of the tab is 5 - 6 mm, and the width of the reinforcing area is 3 - 4 mm.
[0009] In this way, a welding area of 1 - 2 mm can be provided on the outer side of the tab to ensure reliable welding.
[0010] Furthermore, the thickness of the reinforcing material is 0.5 - 1.5 times the thickness of the electrode coating on the electrode sheet.
[0011] Furthermore, the reinforcing material is copper foil and is bonded to the tab with an adhesive.
[0012] Furthermore, the reinforcing material is metal and is connected to the tab by laser welding.
[0013] Furthermore, the reinforcing material is a polymer material and is bonded to the tab with an adhesive.
[0014] A cylindrical battery, characterized in that it includes the full-tab structure of the large cylindrical battery as described above.
[0015] In summary, both the full-tab structure of the large cylindrical battery and the cylindrical battery of the present utility model have the advantages of reasonable structural design, no need for cutting and overlapping, facilitating the simplification of processes, and convenient welding. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the unfolded structure of the electrode sheet.
[0017] Figure 2 It is a schematic cross-sectional view of the wound state of the electrode sheet.
[0018] Figure 3 It is a schematic diagram of the structure of the full-tab core. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] The present utility model will be further described in detail below with reference to the embodiments.
[0020] During specific implementation: As Figures 1 to 3 shown, a full-tab structure of a large cylindrical battery includes an electrode sheet 1, one side of the electrode sheet 1 is connected with a tab 2 extending along the length direction, at least one side of the tab 2 is provided with a reinforcing area 3, and a reinforcing material is laminated and arranged in the reinforcing area 3, asFigure 2 As shown, the reinforcing material is filled between two adjacent layers of the tab 2, and the filling height is lower than the height of the tab 2. By laminating the reinforcing material in the reinforcing area, the reinforcing material is filled between the wound tabs, so that the tabs can maintain an upright state without being cut and stacked, and the ends of the tabs are flatter. Without the shaping process, the tabs can be directly welded to the bus bar.
[0021] In this embodiment, the width of the tab 2 is 5 mm, and the width of the reinforcing member 3 is 3 mm. Thus, a 2-mm welding area can be provided on the outer side of the tab, ensuring that each solder joint can be welded to the tab and improving the welding reliability. To achieve a better winding forming effect of the tab, the thickness of the reinforcing material is selected to be 0.5 to 1.5 times the thickness of the electrode coating on the electrode sheet 1. In this embodiment, the reinforcing material is copper foil and is bonded to the tab by an adhesive. Specifically, laser welding can also be used for connection. Of course, the reinforcing material is mainly used to improve the strength of the electrode sheet, and other materials, such as polymer materials, can also be used, which has nothing to do with the conductivity of the material.
[0022] The above are only the preferred embodiments of the present invention, and the present invention is not limited thereto. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. The all-tab structure of a large cylindrical battery, characterized in that, It includes a pole piece (1), one side of the pole piece (1) is connected with a tab (2) extending along the length direction, at least one side of the tab (2) is provided with a strengthening area (3), a strengthening material is attached in the strengthening area (3) in a laminated manner, the strengthening material is filled between two adjacent layers of the tab (2), and the filling height is lower than the height of the tab (2).
2. The full-tab structure of the large cylindrical battery according to claim 1, characterized in that, The width of the tab (2) is 5-6 mm, and the width of the strengthening area (3) is 3-4 mm.
3. The full-tab structure of the large cylindrical battery according to claim 1, characterized in that The thickness of the strengthening material is 0.5-1.5 times the thickness of the electrode coating on the pole piece (1).
4. The full-tab structure of the large cylindrical battery according to claim 1, characterized in that, The strengthening material is copper foil and is bonded to the tab (2) through an adhesive.
5. The full-tab structure of the large cylindrical battery according to claim 1, characterized in that, The strengthening material is a metal and is connected to the tab (2) through laser welding.
6. The all-tab structure of the large cylindrical battery according to claim 1, wherein, The strengthening material is a polymer material and is bonded to the tab (2) through an adhesive.
7. A cylindrical battery, characterized in that, It includes the full-tab structure of the large cylindrical battery according to any one of claims 1-5.