Thermal runaway anti-backfire pressure release valve and electric vehicle

Abstract

The invention discloses a thermal runaway anti-backfire pressure release valve and an electric vehicle. The thermal runaway anti-backfire pressure release valve comprises a valve body, a waterproof and breathable structure, an anti-backfire structure and a reset part, wherein the anti-backfire structure has a first state and a second state, the anti-backfire structure is positioned at a first position and a second position, and the anti-backfire structure at the first position and in the first state allows small air circulation between the interior and the exterior of the valve body; the anti-backfire structure at the first position and in the second state hinders air circulation between the interior and the exterior of the valve body; the anti-backfire structure at the second position andin the second state allows large air circulation between the interior and the exterior of the valve body; and the pressure in the valve body and the pressure difference between the interior and the exterior of the valve body switch the positions and states of the anti-backfire structure. According to the thermal runaway anti-backfire pressure release valve and the electric vehicle, the basic functions of an existing pressure release valve can be guaranteed, meanwhile, when thermal runaway occurs to a battery pack, circulation between the battery pack and the outside air can be blocked, external oxygen is prevented from entering the battery pack, and the safety of the battery pack is improved.

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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