Liquid-nitrogen cooling method and device for automotive power battery pack

Abstract

The invention relates to a battery cooling method and a battery cooling device, in particular to liquid-nitrogen cooling method and device for an automotive power battery pack. The liquid-nitrogen cooling method for the automotive power battery pack includes directly releasing liquid nitrogen to the surface of the power battery pack and a casing of each battery cell to convert the liquid nitrogen into gas nitrogen, and cooling the surface of the power battery pack and the casing of each battery cell by absorbing a substantial amount of heat in process of converting the liquid nitrogen from liquid into gas. The liquid-nitrogen cooling device for the automotive power battery pack comprises a liquid nitrogen tank (1), a cooling container (8), a connecting pipeline (19), a cooling passage (20), a nitrogen exhaust port (9) and the like. The liquid nitrogen tank (1) is communicated with the cooling passage (20) arranged in the cooling container (8) through the connecting pipeline (19). The liquid-nitrogen cooling method and device for the automotive power battery pack are good in cooling effect, free of consumption of electric energy of the power battery pack, environment-friendly and energy-saving. The cooling method is simple and easy to implement. The cooling device is small in size, the structure is simple and stable, noise and vibration can be avoided, cooling stability is good, and safety is high.

Description

technical field [0001] The invention relates to a battery cooling method and device, in particular to a liquid nitrogen cooling method and device for a vehicle power battery pack. The invention belongs to the technical field of environmental protection and energy saving cooling process equipment and the like. Background technique [0002] At a time when the world advocates low-carbon life, protects the environment, and seeks clean and renewable energy, all countries in the world are investing a lot of manpower and financial resources to develop electric vehicles. Using power battery packs as the power source for electric vehicles is the first choice for electric vehicles. However, the existing power battery pack will generate a lot of heat during the working process of charging and discharging. When the temperature of the battery itself increases, it not only directly affects the electric energy of the battery for charging and discharging, but also directly affects the serv...

AI Technical Summary

Problems solved by technology

Water cooling generally requires cooling water tanks, circulating water pipes, radiators, sealing devices, electric water pumps and other devices. The main disadvantages of water cooling are: the water cooling system itself is large in size and consumes power from the power battery

Air cooling generally requires radiators and electric fans. The main disadvantages of this type of air cooling are: like water cooling, the cooling system itself has a large volume and consumes power from the power battery; The cold air poured in from the outside during the driving process is used to convectively cool the power battery pack. The main defect of this kind of air cooling is: the cooling process is limited by the external temperature, wind speed and other conditions, and it cannot be cooled when parking or charging, and the cooling process is not easy. Control, cooling effect is also very poor

At the same time, the existing water cooling and air cooling will inevitably produce cooling dead angles between adjacent batteries, seriously affecting the cooling effect and battery safety, and using electric water pumps or electric fans, the noise and vibration are also relatively large

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