A large-capacity power lithium battery safety valve

Abstract

The invention discloses a safety valve for a high-capacity power lithium battery. The safety valve comprises a valve body, wherein the valve body comprises an upper valve body and a lower valve body. The lower valve body is internally provided with an exhaust channel while the upper valve body is in a cavity structure. The exhaust channel is communicated with the cavity of the upper valve body. An upper top capable of being rotatably connected with the upper valve body is arranged at the upper end of the cavity of the upper valve body. A lower top is arranged at the lower end of the cavity. The upper and lower tops are connected through an elastic element. A sealing rubber mat for sealing the exhaust channel is fixedly arranged on the lower top. An exhaust hole for exhaustion is arranged on the side wall of the upper valve body. Meanwhile, the position where the valve body is contacted with the sealing rubber mat is arranged in an arc-shaped structure, so that the sealing performance and the pressure relieving stability of the safety valve are further enhanced. Gas in the battery can be effectively discharged when massive gas is generated inside the battery. Meanwhile, the safety valve has high stability and high safety, and is simple in structure and low in production cost.

Description

technical field [0001] The invention relates to the technical field of battery safety valves, in particular to a large-capacity power lithium battery safety valve. Background technique [0002] Under abnormal conditions such as abuse or misuse of large-capacity power lithium batteries, a large amount of gas will be generated inside, so the pressure inside the battery may rise rapidly, and even unsafe accidents such as explosion may occur. In order to improve the safety of the power lithium battery, it is generally necessary to install a safety valve on the battery cover to remove the gas generated inside the battery in time. However, most commonly used safety valves use explosion-proof membrane structures, but the control process for the existence of explosion-proof membranes is relatively complicated, and the safety limit pressure value is not easy to accurately control, and there are situations where the internal pressure gradually increases, but does not reach the explosi...

AI Technical Summary

Problems solved by technology

However, most commonly used safety valves use explosion-proof membrane structures, but the control process for the existence of explosion-proof membranes is relatively complicated, and the safety limit pressure value is not easy to accurately control, and there are situations where the internal pressure gradually increases, but does not reach the explosion value, so the explosion-proof membrane is safe. The valve is prone to failure to release pressure in time, which may lead to safety problems; at the same time, the explosion-proof membrane safety valve also has an explosion-proof membrane that can only be used once, and due to the size limit of the safety membrane, there is a certain limit on the speed of pressure relief. For large-capacity power For batteries, there is a lot of gas generated instantly inside the battery, and the existing safety valve may not be able to remove the large amount of gas generated in time

[0003] In response to the above problems, scientific and technological workers have improved the existing safety valve, such as Chinese patent application 200820085759.4 discloses a safety valve, which includes a hollow screw (1), valve body (2), spring (3), valve core and sealing gasket (7), the valve body (2) is provided with a pressure relief hole in the axial front, and an air inlet is provided in the axial rear, and the hollow screw (1) cooperates with the valve body (2) in the pressure relief hole, One end of the spring (3) cooperates with the hollow screw (1), and the other end cooperates with the valve core, which is characterized in that it also includes a steel ball (5), and the valve core is divided into an upper valve core (4) and a lower valve core. The core (6) and the steel ball (5) fit between the upper valve core (4) and the lower valve core (6); although the safety valve with this structure solves the problems existing in the explosion-proof membrane safety valve to a certain extent, but It has the problems of complex structure, tightness and poor pressure relief stability

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