Heat And Mass Transfer Research Of Power Battery For New Energy Vehicles

With the development of the society and modernization of the city, energyshortage and environmental pollution are worse. Research and development of newenergy vehicles for improving energy efficiency and reducing environmental pollutionis necessary. In this paper, the water management issue of the fuel cell for fuel cellvehicles and the thermal management issue of lithium-ion battery for electric vehiclesare preliminary researched. The main content is divided into two parts: calculated ongas diffusion character of porous electrode with liquid water for the fuel cell; andnumerical simulated on phase change material used for cooling lithium-ion batterypack. The main conclusions are as follows:1. The gas permeability and diffusivity of hydrophilic porous material are betterthan hydrophobic porous material within the same saturation.2. The pore size distribution has effect on the diffusivity character of porousmaterials with liquid water. The calculation formula proposed in this paper explainsthe relative diffusivity showed almost the same value for porous materials havingdifferent pore size distributions.3. In the battery, the center temperature decreases and the boundary temperatureincreases and the temperature distribution is more uniform as long as the thermalconductivity increases with the different discharge rate. The thermal conductivity ofphase change material increases has little effect on decreasing the battery temperature.Therefore, increasing the thermal conductivity of battery could effectively promotethe cooling effect.4. Phase change material with 10mm filled thickness is not completely meltedwith the different thermal conductivity of battery when the battery discharge rate is2C. But it is completely melted in some conditions when the battery discharge rate is3C. The fill thickness must be increasd in order to ensure the cooling effect.