| Automobile industry is one of the most important manufacturing industries in the country,which is directly related to the development of national economy and the improvement of people's living standards.Every economically developed country attaches great importance to the development of automobile industry.The development of science and technology has provided technical support for the requirement of comfort for human beings.The vehicle-mounted weak current system is becoming more and more abundant,and many electronic components have been added.In addition to various kinds of in-car actuators that are already common on the market,such as electronic cigarette lighters,electric windows,automatic air conditioning,various multimedia equipment,navigation,driving recorder,and even automatic driving system are gradually becoming vehicles.New favorite of load system.The use of a large number of new on-board electronic systems has greatly increased the use power of the weak current system in the vehicle.Because of the low supply voltage,the traditional 12V battery system can only meet the power requirements of the vehicle electronic components by increasing the supply current.This requires increasing the cross-sectional area of the power supply cable to meet the demand of large current,which leads to the increase of the vehicle weight and clumsy cables.It also leads to difficulties in installation and maintenance.The only way to solve this problem is to increase the voltage of the weak current system,but too high voltage will lead to the threat of the weak current system to human safety,so a new 48V weak current system replacing the traditional 12V system emerges as the times require.On the other hand,the traditional non renewable fossil energy resources are facing the threat of resource exhaustion.A large number of exhaust emissions have caused huge pollution to the global ecological environment,which has led to the development of new energy vehicles in full swing.In traditional fossil-powered vehicles,the role of 12V batteries is limited to providing power only to the vehicle-borne weak current system,while in new energy vehicles powered by electric power,when 48V battery system is used,because of its large capacity and output power,it can supply the vehicle-borne weak current system in addition to the special situation(main body).Under the condition of power failure or power shortage,the ability of emergency power supply as auxiliary standby power supply for power system can be improved.The reliability of vehicle power system can be improved by using electric energy as power source.The 48V battery pack is also proposed as auxiliary power source,that is,48V battery pack is usually used for power supply of vehicle weak power system,and can be used as power in a short time when the power supply of vehicle is not available.The source drives the who e vehic e.When 48V battery pack is applied to auxiliary power source,the voltage is still low,and the continuous output of high current is needed.A lot of heat will be generated in the battery pack.If the heat can not be dissipated in time,the safety of the battery pack will be affected.This paper takes "48V Lithium Battery Pack for Vehicle" as the research object,uses more stringent working conditions to simulate the harsh working conditions in high temperature in summer for auxiliary power output,and focuses on the research work of heat dissipation structure design of battery pack,in order to achieve the purpose of ensuring good and stable operation of heat dissipation of battery pack under the harsh hot environment with high power output.Firstly,this paper introduces the research background of 48V battery pack and its heat dissipation structure,as well as the research and development status at home and abroad.Secondly,the heat generation principle and heat dissipation mode of battery pack are described in detail.Through the structural design of the module,the heat dissipation in different directions is compared.Considering the cost,technology and other aspects,the design scheme of putting the best heat dissipation surface of the core at the bottom is put forward.Thirdly,a kind of integrated heat dissipation design combining cooling water channel plate with battery cladding is proposed.Two kinds of structural design methods of forced air-cooling and liquid-cooling on the bottom of battery cladding in hot environment are studied,and the heat dissipation effect of the two schemes and the related product structure are simulated and verified.The results show that forced air cooling can not meet the cooling requirements of battery pack in hot environment.The liquid cooling method can better meet the requirements of 48V battery pack temperature control.On this basis.the cooling conditions of liquid cooling which can meet the cooling requirements are found out.Finally,the design of heat dissipation structure is simulated to verify the reliability of vibration and impact of this structure. |
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