Method for improving lithium precipitation or black spots of first-layer negative plate of lithium ion battery

By adding an extra layer of laminated sheets on the outside of the lithium-ion battery electrode group, the problem of lithium plating or black spots on the first negative electrode sheet of the lithium-ion battery is solved, achieving the effects of low equipment requirements, simple operation and strong manufacturability.

CN120809990APending Publication Date: 2025-10-17HU ZHOU YAO NING GU TAI DIAN CHI YAN JIU YUAN YOU XIAN GONG SI
1 Cites 0 Cited by

Patent Information

Application Number
CN202510831407.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-20
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

Existing technologies are difficult to effectively solve the problem of lithium plating or black spots on the first layer of negative electrode sheets of lithium-ion batteries, and conventional methods have high requirements on equipment capabilities and are difficult to operate.

Method used

An extra layer of laminate is added to the outside of the electrode group of the lithium-ion battery. The positive electrode, negative electrode and separator are arranged alternately through the lamination process. The separator is sandwiched between the positive and negative electrode sheets in a Z shape. The outermost layer is the negative electrode sheet, and one or more layers of laminate are added to the outermost layer to form a tight fit to alleviate the gaps caused by warping.

Benefits of technology

It effectively solves the problem of lithium plating or black spots on the first layer of negative electrode sheets, reduces equipment capacity requirements, is simple and easy to operate, and improves manufacturability.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

A method for improving lithium precipitation or black spots of a first-layer negative plate of a lithium ion battery comprises the following steps that a plurality of positive plates, negative plates and diaphragms are assembled into a pole group through a lamination process, the positive plates and the negative plates are alternately arranged, the diaphragms are clamped between the positive plates and the negative plates in a Z-shaped mode, the negative plates are arranged on the outermost layer of the pole group, and finally one layer of diaphragm is wound; adding one or more layers of laminations on the outermost layer of the pole group, winding a plurality of layers of laminations by using diaphragms, and putting the laminations into the shell; and respectively welding the positive pole lug and the negative pole lug, not connecting a plurality of layers of laminated sheets on the outermost layer of the pole group with the pole lugs, injecting electrolyte into the shell, and sealing. The method provided by the invention can solve the problem of lithium precipitation or black spots of the first-layer negative plate, has low requirements on equipment capability, is convenient and easy to operate, and has strong manufacturability.
Need to check novelty before this filing date? Find Prior Art