The Study On Battery Thermal Management System Of Hybrid Vehicle

With the worsening of environmental problems and energy issues, the traditionalautomotive industry has to change to the new energy automotive industry. At the same time,motor, power battery, motor controller, etc., as the core technology of new energy vehicleshave made a breakthrough in recent years. In particular, the development of batterytechnology provides a new platform for the development of new energy vehicles. Currently,the energy density and specific power of the battery can reach to100-500Wh/kg,315W/kg.In addition, its life can reach to1000-2000cycles, so the battery's performance basicallymeets the needs of new energy vehicles. The lead-acid battery and nickel hydrogen battery,have better security than lithium battery, but their specific energy and specific power value ismuch lower than lithium battery. Poor thermal safety of lithium ion, is an important factor,which still constrains the new energy automotive industry. The lithium-ion battery isincreasingly being applied to the new energy vehicles, so the thermal characteristics of thepower battery is necessary, which also is the base of the Thermal Management System(BTMS) of new energy vehicles.Power battery's thermal characteristics contains the thermal safety, thermal efficiencyand the difference among the cells caused by temperature. The main objective is to ensure thatthe battery is running in the appropriate temperature range, the vehicle has good performance,without occurrence of combustion explosions and other accidents. The main content of thisstudy:(1) Research the development of hybrid vehicles, the development of power battery andthe status of thermal characteristics of the power battery.(2) Analyze the principle of heat production and its influence factors of the power battery,and find out a method to analyze the power battery.(3) Study a domestic lithium-ion battery on its thermal characters by using ANSYS,a commercial finite element software.(4) Study the battery pack cooling model, design the cooling structure of the battery pack,and make a simulation by using FLUENT. (5) Design the experiment about the analytical object, and make the verification.This study results provide a theoretical basis for the thermal management system designof new energy vehicles, at the same time to provide a reference for the structural design of thebattery pack.