Fire suppression and fire extinguishing device and method for power battery box of fuel cell vehicle

Abstract

The invention relates to the field of large fuel vehicles, in particular to a fire suppression and fire extinguishing device and method for a power battery box of a fuel cell vehicle. The device comprises a whole vehicle hydrogen cylinder, a first-stage pressure reducing valve is connected to the outer portion of the whole vehicle hydrogen cylinder, and a second-stage pressure reducing valve is connected to the tail end of the first-stage pressure reducing valve; the tail end of the secondary pressure reducing valve is connected with a main electromagnetic valve, one end of the main electromagnetic valve is provided with a main controller, and the tail end of the electromagnetic valve 1 and the tail end of the electromagnetic valve N are both communicated with an electric box. According to the device, the fuel and inhibitor sharing technology is adopted, so that integration and light weight are achieved, and air in the electric box is rapidly exhausted through the rapid electric box gas replacement technology; according to the device, the purity of gas in the electric box is improved, the risk is reduced by adopting a novel fire suppression technology, the problem of thermal runaway of the lithium battery is solved by adopting a low-temperature liquid nitrogen fire extinguishing technology, and the safety of the whole vehicle and the electric box is further guaranteed by adopting a linkage fire extinguishing, high-voltage breaking and fuel cell shutdown technology.

Description

technical field [0001] The invention relates to the field of large fuel vehicles, in particular to a fire suppression and fire extinguishing device and method for a power battery box of a fuel cell vehicle. Background technique [0002] The battery box of the existing fuel cell vehicle uses a dry powder fire extinguishing agent in a cylinder and is placed outside the battery box. When a fire occurs, the dry powder fire extinguishing agent in the cylinder is sprayed out to extinguish the fire. Solve the low-voltage equipment and wiring harness fires outside the electrical box, or use hexafluoropropane or heptafluoropropane fire extinguishing agent to spray inside the box to extinguish the fire when a fire occurs in the electrical box. Fire extinguishing device, the prerequisite for fire extinguishing agent injection is the passive fire extinguishing action after a fire occurs in the power battery box. It cannot prevent and suppress the hidden danger of fire in the power batte...

AI Technical Summary

Problems solved by technology

[0002] The battery box of the existing fuel cell vehicle uses a dry powder fire extinguishing agent in a cylinder and is placed outside the battery box. When a fire occurs, the dry powder fire extinguishing agent in the cylinder is sprayed out to extinguish the fire. Solve the low-voltage equipment and wiring harness fires outside the electrical box, or use hexafluoropropane or heptafluoropropane fire extinguishing agent to spray inside the box to extinguish the fire when a fire occurs in the electrical box. Fire extinguishing device, the prerequisite for fire extinguishing agent injection is the passive fire extinguishing action after a fire occurs in the power battery box. It cannot prevent and suppress the hidden danger of fire in the power battery box in advance, which belongs to passive safety. In case of fire, the damage to electronic components and traditional components is irreversible, and electronic components need to be replaced and tested again. At present, the sealing level of the power battery box is IP68 and above, and the waterproof, breathable, moisture-proof and explosion-proof valve on the box is used daily. For exchange, it is difficult to quickly replace the oxygen-containing air in the battery box with conventional nitrogen inert gas. Due to the weak anti-deformation ability of the electric box with a lightweight shell at present, the deformation of the shell of the electric box will occur if the internal pressure of the electric box is too high, so The pressure of the inert gas entering the box should not be too high, otherwise the electrical box will be agitated and deformed, which will cause the inert gas to completely replace the air in the box, and it will take a long time to reach the state of high-purity nitrogen. Centralized fire extinguishing devices need to reserve a separate installation space in the cabin, and at the same time increase the weight of the vehicle and increase the power consumption of the vehicle. At present, hydrogen is not used to suppress fire during normal use of the battery. When the battery thermal runaway occurs, use Method and device for extinguishing fire with liquid nitrogen

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