Thermal runaway anti-backfire pressure relief valve and electric vehicle

Abstract

The invention discloses a thermal runaway anti-tempering pressure relief valve and an electric vehicle, including a valve body, a waterproof and breathable structure, an anti-tempering structure and a reset part; the anti-tempering structure has a first state and a second state, and the anti-tempering Where the structure is located The first position and the second position, the anti-backfire structure in the first position and the first state allows a small air flow between the inside and outside of the valve body; the anti-backfire in the first position and the second state The fire structure hinders the air flow between the inside and outside of the valve body; the anti-backfire structure in the second position and in the second state allows greater air flow between the inside and outside of the valve body; the pressure in the valve body and the pressure inside and outside the valve body The pressure difference switches the above positions and states of the anti-tempering structure. The present invention can not only ensure the basic function of the existing pressure relief valve, but also block the circulation between the battery pack and the outside air when the battery pack is thermally out of control, prevent external oxygen from entering the battery pack, and increase the safety of the battery pack.

Description

technical field [0001] The invention relates to the technical field of electric vehicle parts, in particular to a thermal runaway anti-backfire pressure relief valve and an electric vehicle. Background technique [0002] With the improvement of society's awareness of environmental protection, green and energy-saving new energy vehicles are more and more favored by the market. The current mainstream new energy is energy storage batteries. For energy storage batteries, batteries are energy storage units. Under extreme working conditions such as short circuit, overcharge, and puncture, it is easy to generate a large amount of heat in a short time; in this case Under normal circumstances, if the inside of the battery pack is supplied with sufficient oxygen, secondary combustion is likely to occur, which is extremely dangerous. [0003] As an important part of electric vehicles, the pressure relief valve can release the internal air pressure when the internal air pressure reache...

AI Technical Summary

Problems solved by technology

However, when the existing pressure relief valve is triggered, a large vent hole will be formed, which will cause the outside air to flow back. Since there is a large amount of oxygen in the backflow air, it will aggravate the thermal runaway reaction inside the battery pack.

According to the test, in a sealed environment, the temperature of thermal runaway is about 400°C, and in the case of sufficient oxygen, the temperature of thermal runaway can reach 800°C; when the temperature of the battery pack reaches 800°C, it is easy to cause the vehicle to be flammable. fire, causing major accidents

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