Battery cells and electrical equipment

By designing a first electrode sheet with a step-shaped insulating layer and a ceramic layer in the electrode assembly of the battery cell, the problems of dead folds and short circuits during the bending of the electrodes are solved, and the safety and cycling performance of the battery cell are improved.

CN119742420APending Publication Date: 2025-04-01XIAMEN AMPACE TECH LTD
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Patent Information

Application Number
CN202411943418.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-04-01

AI Technical Summary

Technical Problem

The existing battery cells are prone to forming dead folds during the bending of the ears, which increases the risk of short-circuiting of the battery cells. The inappropriate thickness of the insulation layer will affect the safety performance and cycling performance of the battery cells.

Method used

A battery cell is designed, wherein the electrode assembly includes a first electrode sheet having a specific structure. The insulating layer of the first electrode sheet has a stepped structure along the width direction of the substrate, the thickness gradually decreases from the first end, and a ceramic layer is provided at a part of the first electrode ear to improve insulation performance.

Benefits of technology

Through this design, the risk of dead folds when the pole ear is bent is reduced, the possibility of short-circuiting of the battery cell is reduced, and the safety and cycling performance of the battery cell is improved.

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Abstract

The present application provides a battery cell and an electrical device, wherein the battery cell comprises an electrode assembly, the electrode assembly comprises a first pole piece, the first pole piece comprises a first substrate, a first active material layer and an insulating layer, the first substrate comprises a first current collector and a first pole ear, the first substrate is provided with the first active material layer and the insulating layer on at least one side in the thickness direction thereof, the first active material layer and the insulating layer are arranged along the width direction of the first substrate, the first active material layer is located on the first current collector, the insulating layer is at least partially located on the first pole ear, the insulating layer has a first end close to the first active material layer and a second end away from the first active material layer, and the first pole ear extends beyond the second end; the thickness of the first active material layer is H, the thickness of the insulating layer at the first end is H1, the units of H and H1 are μm, 0.1H≤H1≤0.95H, and the thickness of the insulating layer tends to decrease in the direction from the first end to the second end, which is beneficial to improving the safety performance of the battery cell.
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