Positive pole piece, secondary battery and electronic device
By setting pattern areas in the single-side positive electrode material layer area of the positive electrode sheet, the length proportion of the positive electrode sheet and the length proportion of the empty foil area are controlled, the curling problem caused by cold pressing residual stress in the single-side positive electrode material layer area is solved, and more stable interface and bonding are achieved, the risk of fracture is reduced, and the performance and safety of the secondary battery are improved.
CN119920827APending Publication Date: 2025-05-02NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information
- Application Number
- CN202510111735.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-05-02
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Figure CN119920827A_ABST
Abstract
The invention provides a positive pole piece, a secondary battery and an electronic device, the positive pole piece comprises a positive current collector and a positive material layer, along the length direction of the positive pole piece, the positive pole piece comprises a single-sided positive material layer area and an empty foil area, the single-sided positive material layer area is provided with a pattern area, and the empty foil area is arranged on the single-sided positive material layer area. The pattern area comprises a plurality of convex parts positioned on the positive electrode current collector of the single-sided positive electrode material layer area and a plurality of concave parts positioned on the positive electrode material layer of the single-sided positive electrode material layer area, and the plurality of convex parts and the plurality of concave parts are in one-to-one correspondence. Through the arrangement, the deformation of the single-sided positive electrode material layer region caused by cold pressing residual stress can be reduced, and the curl problem of the single-sided positive electrode material layer region is improved.
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