Explosion-proof device of power battery

Abstract

The invention discloses an explosion-proof device of a power battery, which can be arranged on an explosion-proof hole of a battery cover board or a battery shell. The explosion-proof device comprises an insulated and sealed battery cover board or an explosion-proof board of the explosion-proof hole of the battery shell, a tension board and an explosion-proof cover, wherein the tension board is connected to the explosion-proof board by welding points and is provided with at least one venthole; and the explosion-proof cover is fixed on the battery cover board or the battery shell to compress the explosion-proof board and press the edge of the tension board. In the explosion-proof device of the power battery, the tension board is fixedly welded on the explosion-proof board to form a whole, the structure of the whole explosion-proof device is smoother, and the explosion-proof board is torn by the welding-point separation action of the tension board and the explosion-proof board in order to avoid the false action of the explosion-proof board and ensure the consistency of bursting pressure.

Description

technical field [0001] The invention relates to a power battery, in particular to a power battery explosion-proof device with good safety performance. Background technique [0002] With the increasingly prominent environmental problems, low-carbon economy has become the mainstream of future economic development. As representatives of new energy vehicles, hybrid vehicles and electric vehicles have gradually been recognized by manufacturers and consumers. As the main power source of new energy vehicles, power batteries have become a key component of electric vehicles. [0003] The characteristics and application occasions of the power battery itself are relatively special, and users have very strict requirements on its capacity, rate, reliability and safety. When an abnormal situation occurs, the abnormal battery should stop working in time to prevent explosion and fire, which is the basic requirement for the safety of power batteries. For this reason, an explosion-proof de...

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Problems solved by technology

[0005] However, the above-mentioned existing power battery explosion-proof devices have at least the following defects: the consistency of the burst pressure is not good, the pressure release lag is prone to occur, and it is easy to malfunction when the external force is applied during the production process (the explosion-proof membrane is pierced), so the application has been restricted. limit

In addition, the above-mentioned existing power battery explosion-proof device welds or presses a metal explosion-proof film with a small thickness on the metal cover plate, and places it in the complex electrochemical environment in the battery. The explosion-proof film is easily corroded and perforated and fails (if the battery If the material of the cover plate is different from that of the explosion-proof membrane, the corrosion problem will be more serious), it cannot work normally, and even brings other safety hazards, which seriously affects the safety performance of the power battery

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