Secondary battery

By doping high-hardness filler into the active layer of the negative electrode sheet of the lithium-ion battery, the compressive resistance of the negative electrode sheet is improved, and the problem of poor compressive strength of the negative electrode sheet is solved, thereby improving the safety performance of the battery and maintaining capacity and performance.

CN119695239APending Publication Date: 2025-03-25ZHUHAI COSMX BATTERY CO LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202411788853.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The negative electrode sheets of existing lithium-ion batteries have poor compressive strength and are prone to rupture when under pressure, resulting in short circuits and fire explosions, affecting the safety performance of the battery.

Method used

By doping high-hardness fillers into the active layer of the negative electrode sheet, the compressive resistance of the negative electrode sheet is improved, so that the ratio of its ultimate compressive stress to the extreme compressive stress of the positive electrode sheet reaches 0.90 or above.

Benefits of technology

It effectively improves the anti-extrusion threshold of lithium-ion batteries, prevents the negative electrode sheet from rupturing and causing short circuits, thereby improving the safety performance of the battery without affecting the battery capacity and electrochemical performance.

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

Abstract

The invention discloses a secondary battery, belongs to the technical field of lithium ion batteries, and overcomes the defects of poor compressive strength of a negative plate and difficulty in guaranteeing the safety of the battery in the prior art. The secondary battery comprises a positive plate and a negative plate, the negative plate comprises a negative current collector and a negative active layer arranged on at least part of the surface of the negative current collector; the negative active layer comprises a filler; the ultimate compressive stress of the negative plate is A, the ultimate compressive stress of the positive plate is B, and A / B is greater than or equal to 0.90. The anti-pressure capability of the whole battery is improved by improving the ultimate anti-pressure stress of the short plate-negative plate of the secondary battery. And when A / B is greater than or equal to 0.90, short circuit caused by negative plate breakage when the battery is extruded can be effectively prevented.
Need to check novelty before this filing date? Find Prior Art