Pole piece, electrochemical device, and electronic device

By setting grooves on the surface of the electrode current collector to accommodate the tabs and insulating adhesive layer, the problem of increased electrode thickness caused by tab adhesion is solved, thereby improving the cell energy density and fast charging performance of lithium-ion batteries.

CN116031364BActive Publication Date: 2026-06-30NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGDE AMPEREX TECHNOLOGY LTD
Filing Date
2022-10-13
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The adhesive on the tabs adheres to the surface of the electrode, which increases the overall thickness of the electrode and affects the cell energy density, fast charging performance, and cycle performance of lithium-ion batteries.

Method used

First and second grooves are provided on the current collector surface of the electrode, the electrode tab is received in the groove, and the first insulating adhesive layer is provided in the groove to reduce the direct adhesion of the insulating adhesive layer to the electrode surface. The groove structure is provided to receive the insulating adhesive layer to reduce the impact on the electrode thickness.

Benefits of technology

It effectively reduces the impact of the insulating adhesive layer on the overall thickness of the electrode sheet, improves the energy density of the battery cell, and enhances the uniformity of battery cell thickness and fast charging performance.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116031364B_ABST
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Abstract

This application relates to the field of battery technology, and specifically discloses an electrode, electrochemical device, and electronic device, including: a current collector, an active material layer, a tab, and a first insulating adhesive layer. The active material layer is disposed on the surface of the current collector, and the active material layer has a first groove and a second groove penetrating the bottom of the first groove to the current collector. The current collector is partially exposed in the second groove. The tab is received in the first groove and the second groove and is connected to the current collector. The first insulating adhesive layer is disposed on the side of the first groove opposite to the current collector. The projections of the first insulating adhesive layer and the tab along the thickness direction of the current collector are located within the first groove of the active material layer. Through the above method, this application embodiment can reduce the impact of the first insulating adhesive layer on the overall thickness of the electrode, improve the cell thickness consistency, and enhance the fast charging and cycle performance of the cell.
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