Cells, Batteries and Electronic Devices

By providing a high capacity active material layer on the cutting part and main body part of the negative electrode current collector of the battery cell, the problem of high difficulty in processing the battery cell and low energy density is solved, and the effect of effectively avoiding lithium extraction and improving energy density is achieved.

CN222705565UActive Publication Date: 2025-04-01HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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Patent Information

Application Number
CN202420599850.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-26
Publication Date
2025-04-01
Estimated Expiration
2034-03-26

AI Technical Summary

Technical Problem

The existing battery cell chip slitting method cannot thin/thicken the head and tail of the positive/negative electrode during the coating process, making it difficult to process the battery cell and reduce the overall energy density of the battery cell.

Method used

A battery cell is designed in which the surfaces of the positive electrode current collector and the negative electrode current collector are coated with an active material layer. By providing a high capacity active material layer on the cutting part and main body part of the negative electrode current collector, the lithium-embedding ability of the negative electrode current collector is improved to avoid lithium evolution.

Benefits of technology

It effectively avoids lithium evolution phenomenon at the head and tail of the battery cell, improves the energy density of the battery cell, reduces the waste of active material, and reduces production costs.

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Abstract

The utility model relates to the technical field of batteries, and in particular to a battery cell, a battery and an electronic device. The battery cell includes a positive current collector and a negative current collector, the positive current collector has a first main body and a first cutting part, the first main body and the first cutting part are both provided with a first positive active material layer, the negative current collector has a second main body and a second cutting part, the second main body is provided with a first negative active material layer, the second cutting part is provided with a second negative active material layer, wherein the gram capacity of the first negative active material layer is less than the gram capacity of the second negative active material layer, and the gram capacity of the first negative active material layer is not less than the gram capacity of the first positive active material layer. The battery includes the above-mentioned battery cell. The electronic device includes the above-mentioned battery. The battery cell, battery and electronic device have high energy density, which reduces the risk of lithium plating.
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