| Faced with many challenges such as energy shortages and environmental pollution,the automotive industry is undergoing a revolution in “electricization”.Pure electric vehicles with zero carbon emissions are widely welcomed by the market and are also the focus of current research on new energy vehicles.However,the large-scale promotion of pure electric vehicles faces two major problems: long charging time and short driving range.In the case of no major breakthrough in the development and manufacturing technology of power batteries,the reasonable and efficient power battery thermal management system is the key to maintaining the driving mileage and ensuring the safe operation of pure electric vehicles.The main research object of this paper is the thermal management system of the vehicle power battery pack.The main research content is based on the structural design of the key components of the thermal management system and the control strategy based on its working characteristics.This paper first investigates and analyzes the research status and development trend of battery pack thermal management technology.Based on combing and analyzing the current mainstream battery pack cooling method,an integrated thermal management of coordinated vehicle air conditioner including power battery pack and passenger compartment is designed.The system integrates the thermal management of the power battery pack and the passenger compartment into the same system,and proves the rationality and realistic feasibility ofthe scheme design through simulation and experiment.In the specific research process,after analyzing the heat generation mechanism of the power battery and the passenger compartment,the heat dissipation requirements are calculated according to their heat generation characteristics.Based on the analysis of the refrigeration principle of the vehicle air conditioning system,the key components of the air conditioning system were selected and matched according to the thermal load of the power battery pack and the passenger compartment.After comparing the advantages and disadvantages of the current mainstream battery pack cooling method,the liquid cooling with more comprehensive performance is selected as the heat dissipation method of the battery pack in this paper.Based on this,a battery pack with air conditioning cold air and natural wind combined to assist heat dissipation is designed.The advantage of combination assistance is that it can fully utilize the low-temperature air of the external environment to assist the battery pack to dissipate heat,reduce the energy consumption of the temperature control system,and use the air-conditioning cold air to assist the heat dissipation of the battery pack,so that the scheme also has a good temperature control ability in a high temperature environment.According to the structural characteristics of the liquid cooling temperature control scheme and the suitable temperature characteristics of the battery pack and the passenger compartment,the temperature control strategies of the power battery pack and the passenger compartment are respectively formulated.In the simulation software AMESim,the power battery pack liquid cooling temperature control system is integrated into the pure electric vehicle model,and the harsh environment temperature is simulated to simulate the rationality of the design.Subsequently,a test bench for theliquid-cooled temperature control system of the battery pack was built,and the Arduino development board was used as the controller to realize the temperature control process.The chroma test equipment is responsible for the recording of temperature data during the experiment,the practical feasibility and heat dissipation capacity of the liquid cooling temperature control scheme are proved by experiments. |
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