| In recent years,Chinese natural energy problems have became more and more prominent,and its main distribution characteristics are: more coal,less oil,lack of gas;In this case,the coal resource becomes the most important natural resource in China,and the coal resource also supports our national economy.It has an indispensable position in the rapid development of our country's economy.With the rapid development of modern mining technology and the increasing volume of underground coal mining in China,the number of explosion-proof vehicles used as vehicles for underground operations is increasing.Because there are often a large number of flammable and explosive gases and substances hidden under the mine,and the batteries of underground vehicles will release a large amount of battery heat during charging and discharging,it is necessary to apply certain heat dissipation measures to them.However,because of its airtight and explosion-proof,the air-cooled and water-cooled heat dissipation mode of explosion-proof electric vehicle will bring potential risks.In order to improve our national economy,it is necessary to solve the cooling problem of the battery pack in explosion proof battery box.In this paper,the heat dissipation of explosion proof battery box using phase change material is proposed,which is mainly studied through two aspects: heat absorption phase transition and heat dissipation solidification.(1)The proposal and design of the phase change heat dissipationstructure(cooling tank and cooling layer)of the explosion proof battery box.(2)Add a 50 mm cooling tank between the individual battery packs of the explosion-proof battery box,fill the cooling tank with a certain phase transition material(paraffin and graphene are combined at a ratio of 3:1),and analyze the phase change heat by fluid calculation.Effect.Through simulation,it was found that the phase change heat dissipation applied in the explosion proof battery box can keep the battery temperature in the optimal working state for a long period of time,and the battery can continue to work 5000 s and keep it within the optimal working temperature range.At the same time,during the simulation,it is found that the heat dissipation of the explosion-proof battery box in the heat dissipation process is very uneven.In this paper,the structural optimization and improvement of the explosion-proof battery box are proposed.The phase change cooling layer is increased by 20 mm on the outer wall of the explosion-proof battery box.After optimizing the structure,The unevenness of heat dissipation of the battery package is solved and the cycle service life of the battery is improved.(3)Using Fluent software to simulate the solidification process and temperature changes of the phase transition material when the battery pack does not work in the entire battery box.When the battery does not work,the phase change material will use the nature of its own melting / solidification to perform the solidification phase change process,reduce the heat absorbed by it,prepare for the melting phase change heat dissipation when the next battery is working,and can be in a low temperature environment.,Heating the battery to heat up greatly avoids the loss of energy and has almost no pollution to the environment.It is simulated that it takes about 1000 s to solidify at 15 ? and 4000 s to solidify at 31.5 ?.In this paper,a structural optimization and improvement scheme is proposed to increase the cooling tank by 50 mm and the outer wall by 20 mm,and the influence of the improved structure on the heat dissipation of the battery pack is analyzed by Fluent simulation.The results show that the phase change heat dissipation method of the explosion-proof battery box is optimized,and the heat dissipation and heat dissipation of each battery package are solved accordingly.Through simulation calculation,the method and structure of heat dissipation for explosion proof battery box proposed in this paper can be realized technically. |
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