Diaphragm, winding type battery cell and battery

By setting grooves in the corner section of the diaphragm winding of the lithium-ion battery, the problem of electrolyte being extruded is solved and the cycling performance of the battery is improved.

CN222785414UActive Publication Date: 2025-04-22HUIZHOU LIWINON NEW ENERGY TECH CO LTD
View PDF 0 Cites 2 Cited by

Patent Information

Application Number
CN202420875296.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-24
Publication Date
2025-04-22
Estimated Expiration
2034-04-24

AI Technical Summary

Technical Problem

During the circulation process of existing lithium-ion batteries, the expansion of positive and negative electrode sheets will cause the electrolyte in the corner area to be extruded, resulting in insufficient electrolyte, and then lithium-ion in the corner area will occur, seriously affecting the circulation performance of the winding battery cell.

Method used

A diaphragm is designed to alternately distribute the winding straight section and the winding corner section along the length direction, with grooves provided on at least one side of the corner section. The grooves can accommodate the electrolyte and are sealed when the pole sheet expands to prevent the electrolyte from being extruded.

Benefits of technology

By setting grooves in the winding corner section of the diaphragm, the electrolyte can be effectively accommodated and retained, improving the insufficient electrolyte in the corner area, reducing lithium evolution phenomenon, and improving the cycling performance of the winding battery cell.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222785414U_ABST
    Figure CN222785414U_ABST
Patent Text Reader

Abstract

The utility model discloses a diaphragm, winding type cell and battery, wherein the diaphragm comprises winding straight sections and winding corner sections which are alternately distributed along the length direction of the diaphragm, and at least one surface of at least one winding corner section is provided with a groove. According to the technical scheme, the lithium precipitation condition of the corner area of the battery is improved, and the cycle performance of the winding type battery cell is improved.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Cited By

  • Secondary battery and electric device

    CN121035532A

  • Battery cell

    CN122000596A