Pole piece structure, battery cell, battery device and electric equipment

By independently manufacturing and welding the positive and negative electrode sheets, the problem of uneven thickness in the electrode structure was solved, improving the production efficiency and safety of the cells and battery devices, and increasing the yield rate.

CN224342304UActive Publication Date: 2026-06-09BYD CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Utility models(China)
Current Assignee / Owner
BYD CO LTD
Filing Date
2025-04-07
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In the existing technology, during the production process of the electrode structure, the different compaction degrees of the positive electrode active material layer and the negative electrode active material layer result in uneven thickness distribution, which easily leads to interference, cracks and breakage, affecting the production efficiency and safety of the cell and battery device, and reducing the yield.

Method used

The positive and negative electrode sheets are manufactured independently. The first positive electrode active material layer and the first negative electrode active material layer are rolled and pressed separately. The positive electrode current collector and the negative electrode current collector are connected by welding to form a solder mark to ensure electrical conductivity. The solder mark is designed in a grid shape to stabilize the mechanical and electrical connection.

Benefits of technology

This achieves uniform thickness distribution of the positive and negative electrode sheets, avoids packaging interference, reduces the probability of lithium plating, improves the production efficiency and safety of cells and battery devices, and increases the yield rate.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a pole piece structure, a battery cell, a battery device and a power utilization equipment, and relates to the technical field of batteries. The pole piece structure comprises a positive pole piece and a negative pole piece. The positive pole piece comprises a positive pole current collector and a first positive pole active material layer. The negative pole piece comprises a negative pole current collector and a first negative pole active material layer. In the thickness direction of the pole piece structure, the positive pole current collector is connected to one side of the negative pole current collector and electrically connected, the first positive pole active material layer is arranged on the side of the positive pole current collector away from the negative pole piece, and the first negative pole active material layer is arranged on the side of the negative pole current collector away from the positive pole piece. Through such an arrangement, the yield of the battery device is improved.
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