Pressure adjustable safety valve for lithium ionic cell

Abstract

A pressure-adjustable safety valve of a lithium ion battery consists of an end cover and a valve body, a valve cavity is formed in the valve body, the valve cavity is formed by a screw hole, a through hole and an exhaust channel with the same central shaft, a conical surface is formed between the through hole and the exhaust channel, a sealing ring is fixedly arranged on the conical surface, a steel ball is fixed on the conical surface with the sealing ring, a screw is fixedly arranged in the screw hole, a spring is fixed between the screw and the steel ball to form an exhaust hole in the valve body which forms the through hole, the exhaust hole penetrates through the valve body and connects the through hole to the outside of the valve body; a positioning screw hole is further formed in the valve body which forms the screw hole, the positioning screw hole penetrates through the valve body, and a positioning screw for fixing the screw is arranged in the positioning screw hole. The critical pressure of the exhaust of the battery is fixed, thereby better playing the roles of safety and explosion protection; furthermore, the arc-shaped exhaust mode can not cause the damage to the human body, thereby being applicable to high-power dynamical type lithium-ion batteries.

Description

technical field [0001] The invention relates to a battery safety valve, in particular to a lithium-ion battery pressure-adjustable safety valve. Background technique [0002] The safety valves of traditional power lithium-ion batteries are all disposable, that is, the inside of the battery generates pressure due to its own chemical reaction. When the pressure reaches a certain value, the safety valve opens to release the pressure and discharge the gas to achieve complete deflation and explosion protection. purpose, while the battery is scrapped. It is a great waste of resources for lithium batteries with high cost and high power power. [0003] The existing safety valves for secondary batteries are usually not sensitive enough to play the role of safety and explosion protection, and are not suitable for power lithium-ion batteries. Chinese Patent Announcement No. CN2322263 discloses a secondary battery vent valve that uses a threaded cover and a spring to adjust the critic...

AI Technical Summary

Problems solved by technology

However, such an air valve has the following disadvantages. The critical pressure adjustment method is controlled by the degree of entry of the cover. The cover is directly exposed to the air, and the battery will inevitably cause the screws to loosen during use.

If the penetration of the cover is too deep and there is no space for the spring to stretch, the corresponding internal pressure will not be released and cannot play a safe and explosion-proof role; if the penetration of the cover is too shallow, the inside and outside of the battery may communicate, causing the electro-hydraulic to absorb water and the electrode group to expand. , The battery is scrapped

Images