A breathable pressure relief tab and method of processing the same

By designing breathable and pressure-relief tabs on the tabs of the pouch cell, and utilizing the functional membrane of modified polyolefin material to achieve one-way ventilation of the gas inside the cell, the problem of venting and pressure relief of the pouch cell is solved, thereby improving the safety and service life of the cell.

CN116190904BActive Publication Date: 2026-07-24ANHUI DINGJI NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202310166880.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-22
Publication Date
2026-07-24
Estimated Expiration
2043-02-22

AI Technical Summary

Technical Problem

Existing pouch cells are difficult to effectively vent and depressurize, leading to pressure buildup inside the cells, which may cause leakage and safety hazards, especially in cells made of soft materials where explosion-proof valves are difficult to install.

Method used

A breathable pressure relief electrode tab is designed, including a metal conductor and a functional membrane. The functional membrane has an exhaust channel. One end of the exhaust channel is connected to the inside of the battery cell, and the other end is designed to be outside the top seal of the battery cell. The sealing functional membrane and the breathable functional membrane are made of modified polyolefin material to ensure that the gas can pass through in one direction under the pressure difference and prevent water vapor from entering.

Benefits of technology

This achieves stable release of internal pressure within the battery cell, improving the cell's reliability and lifespan, and ensuring the safety performance of the cell's packaging area.

✦ Generated by Eureka AI based on patent content.
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Abstract

The application discloses a kind of breathable pressure relief tab and its processing method, comprising: metal conductor and functional film, the metal conductor upper and lower two sides are equipped with functional film, metal conductor surface is equipped with exhaust passage or the functional film between the both sides of metal conductor is equipped with exhaust passage;Functional film includes breathable functional film, sealing functional film;Exhaust passage includes single-channel type, multi-channel type and dumbbell channel type, one end of exhaust passage is connected in the inside of electric core, and the other end of exhaust passage is designed in the exposed end of tab.The application guarantees excellent sealing performance, and then guarantees the packaging interface of electric core, improves the reliability and service life of electric core;Functional film material can maintain better deformation rate under high temperature condition, so as to avoid the collapse of film material, effectively guarantee breathable channel;Gas generated in the inside of electric core can be orderly discharged under the condition of pressure difference, so as to maintain low pressure in the inside of electric core, improve the reliability of electric core.
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