Pole piece, battery cell and pole piece manufacturing method

By using a combination technology of protective parts and active material layers on the electrodes of lithium-ion batteries, insulating adhesive paper is embedded to solve the problems of uneven thickness at the electrode connections and poor laser thinning consistency, which improves the battery energy density and insulating adhesive paper. Stability avoids corrosion of current collectors.

CN119297193APending Publication Date: 2025-01-10ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411240946.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-05
Publication Date
2025-01-10

AI Technical Summary

Technical Problem

The use of insulating tape on the electrode joint of the existing lithium-ion battery plates results in uneven thickness, affecting the energy density of the battery cell, and poor depth consistency of the laser thinning process leads to problems such as corrosion of the current collector and increased impedance.

Method used

The preset protective parts are connected to the current collector, and the active material layer is coated and a first storage groove is opened in its position to embed insulating adhesive paper. The protective parts are resistant to high temperatures and are not easily thinned by laser, ensuring that the insulating adhesive paper is completely contained in In the groove, avoid thickness increase and current collector corrosion.

Benefits of technology

It effectively reduces the adhesion thickness of insulating adhesive paper, improves the energy density of the battery, and ensures the consistency of laser thinning depth through the high temperature resistance of the protective parts, avoids corrosion of the current collector, and improves the adhesion stability of insulating adhesive paper.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a pole piece, a battery cell and a pole piece manufacturing method. The pole piece comprises a current collector, a protection part, an active substance layer and insulating gummed paper, wherein the protection part is connected with the current collector; the active material layer is coated on the surface of the current collector and corresponds to the position of the protective part, the active material layer is provided with a first accommodating groove, the first accommodating groove extends along the thickness direction of the pole piece, and the bottom of the first accommodating groove is exposed out of the protective part; the insulating gummed paper is attached to the protection piece and is at least partially located in the first containing groove. According to the pole piece, the protection effect can be achieved through the preset protection piece, and the foil exposure phenomenon caused by too large laser thinning depth is avoided.
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