Power lithium battery safety valve

Abstract

The invention discloses a power lithium battery safety valve, which comprises a valve body, an air inlet pipe, a low-pressure exhausting mechanism and a high-pressure exhausting mechanism, wherein thelow-pressure exhausting mechanism and the high-pressure exhausting mechanism are arranged in an inner cavity of the valve body; the air inlet pipe is fixed in the inner cavity of the valve body; thevalve body is respectively provided with a high-pressure exhaust opening and a lower-pressure exhaust opening on the inner side walls of the two sides of the air inlet pipe; the low-pressure exhaust mechanism comprises a first buffer air pipe, a second buffer air pipe, a low-pressure air inlet pipe, a low-pressure exhaust pipe, a connecting pipe and a gas storage cavity; the high-pressure exhaustmechanism comprises a high-pressure exhaust pipe; the two ends of the high-pressure exhaust pipe are respectively communicated and connected onto the high-pressure exhaust opening and the air inlet pipe; the high-pressure exhaust pipe is arranged at one side, far away from a plunger piston, of the low-pressure air inlet pipe. Through the arrangement of the low-pressure exhaust mechanism and the high-pressure exhaust mechanism, when the air pressure of the waste gas is too high, the high pressure can be instantly released; the explosion is prevented; when the air pressure of the waste gas is low, the waste gas cannot be discharged into the atmosphere at low pressure; the airtightness of the safety valve cannot be influenced; the power lithium battery safety valve is worthy of being popularized.

Description

technical field [0001] The invention relates to the technical field of battery safety, in particular to a power lithium battery safety valve. Background technique [0002] Power lithium battery technology is a new type of environmentally friendly energy that has only emerged in recent years. It is widely used in energy storage in electric vehicles, electric bicycles, wind power generation, solar power generation, communications and other fields. Power lithium battery technology is still in its infancy in China. During the charge and discharge process of the battery, the electrons are constantly migrating back and forth to generate heat. Short circuit conditions caused by factors such as charging or discharging, impact or failure will precipitate a large amount of chemical gas. When the pressure reaches a certain level or the internal short circuit of the battery produces sparks It will burn the precipitated flammable gas, causing the battery to explode, posing a threat to pe...

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Problems solved by technology

[0005] Although the above two application documents provide the safety performance of the battery very well and can perform explosion-proof exhaust well, they still have obvious defects: no matter whether the gas pressure generated inside the battery is large enough, as long as the gas pressure can Push the ball valve, the ball valve will open immediately, communicate with the outside atmosphere, and release the gas, but this will greatly reduce the airtightness of the safety valve, which will affect the battery itself

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