Hard case battery and its one-way vent valve

Abstract

The invention discloses a one-way exhaust valve for a hard-shell battery, which comprises: a hollow valve body that can be installed on the battery shell of the hard-shell battery or on the top cover of the battery, the bottom end of the valve body communicates with the inside of the battery, and the valve body The top of the valve body extends out of the battery; the adsorption layer is sealed and installed in the valve body, and the adsorption layer is used to absorb the gas generated inside the battery and discharge the gas from the top of the valve body to the outside of the battery; The layer allows the gas inside the battery to exit the battery in one direction to the outside. Compared with the prior art, the one-way exhaust valve of the hard-shell battery of the present invention does not need to open the valve, and the CO generated inside the battery can be released only by the principle of adsorption and desorption. 2 , CO, CH 4 Such small molecular gases are discharged to the outside, and the exhaust operation is simple and has ideal sealing performance, which can significantly improve the service life and safety performance of hard-shell batteries. In addition, the invention also discloses a hard shell battery.

Description

technical field [0001] The invention belongs to the battery field, and more specifically, the invention relates to a hard shell battery and a one-way exhaust valve thereof. Background technique [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have the advantages of high energy density and long cycle life, so they are widely used as power sources for electric vehicles. During storage or cycling of lithium-ion batteries, the electrolyte will inevitably react with the positive active material and generate gas. As the volumetric energy density requirements for lithium-ion batteries are getting higher and higher, the dead volume of the battery's internal design is getting smaller and smaller. When a small amount of gas is generated inside the battery, the internal pressure of the battery will increase sharply. If the internal pressure of the battery is too high, the battery case will be deformed or ev...

AI Technical Summary

Problems solved by technology

However, since the exhaust valve is opened, the sealing performance of the battery is deteriorated, and the outside air is easy to invade the internal battery cell, which affects the safe use of the battery.

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