Pole piece, battery cell and battery

By setting an empty foil area on the second side of the electrode current collector and coating it with a liquid-retaining coating, the problem of insufficient electrolyte wetting is solved, thereby improving the liquid retention capacity and cycle performance of the battery.

CN224720829UActive Publication Date: 2026-09-04ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202521880206.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-02
Publication Date
2026-09-04
Estimated Expiration
2035-09-02

AI Technical Summary

Technical Problem

In existing technologies, increased electrode compaction density makes it difficult for electrolyte to wet the battery, resulting in poor electrolyte retention and consequently affecting battery cycle performance.

Method used

A second empty foil area is provided on the second side of the current collector of the electrode, and a liquid-retaining coating is coated in this area to enhance the wetting ability of the electrolyte and increase the liquid retention of the battery through the liquid-retaining properties of the coating, thereby reducing electrolyte loss.

Benefits of technology

It improves the wetting ability of the electrolyte in local areas of the electrode, increases the electrolyte retention of the battery, and improves the cycle performance and service life of the battery.

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Abstract

The application relates to the technical field of batteries, and discloses a pole piece, a battery cell and a battery. The pole piece comprises a current collector, a first active material layer and a second active material layer. In the thickness direction, the current collector comprises opposite first and second sides. The second side comprises a first empty foil area and a second empty foil area. In the length direction of the current collector, the first empty foil area and the second empty foil area are arranged in sequence, and the second empty foil area is arranged at one end of the second side. The first active material layer is coated on the first side. The second active material layer is coated on the first empty foil area. A liquid retention coating is coated on the second empty foil area. The battery cell comprises a separator, a positive pole piece and a negative pole piece. At least one of the positive pole piece and the negative pole piece adopts the pole piece. The separator is arranged between the positive pole piece and the negative pole piece. The battery comprises an aluminum plastic film and the battery cell. The pole piece, the battery cell and the battery can improve the liquid retention amount of the battery, thereby improving the cycle performance of the battery.
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