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배터리냉각시스템 냉각성능 예측을 위한 열전달 모델 개발
임혜수(Hyesu Lim),김화성(Hwasung Kim),공태윤(Taeyun Kong),박근서(Keunseo Park),김충영(Chungyoung Kim),권태석(Taesuk Kwon) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
In recent years, high-voltage batteries of electric vehicles have been in the spotlight as high-efficiency cooling technology capable of coping with high cell heating as high output and large capacity are inevitable due to an increase in travel distance and shortening of rapid charge time. Battery cooling technology of next-generation electric vehicles is changing between indirect-refrigerant based cooling using water-glycol coolant as cooling fluid and direct-refrigerant cooling type. It is important to predict cooling performance and battery cell temperature distribution to develop new battery cooling system. In this paper, 1D analysis model based on thermal resistance network method was developed through EES(Engineering Equation Solver) and system cooling load, cell temperature distribution, and outlet condition of cooling fluid were confirmed. As a result, the error between test data and the analytical model was within 12% at maximum, and it was confirmed that direct-refrigerant cooling reaches target temperature compared to that of indirect cooling.
1D 해석을 통한 배터리 냉각 시스템 성능에 관한 연구
박근서(Keunseo Park),임혜수(Hyesu Lim),공태윤(Taeyun Kong),김화성(Hwasung Kim),김충영(Chungyoung Kim),권태석(Taesuk Kwon) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
An investigation on battery cooling system has been conducted using 1D simulation. Commercial Software, KULI, is used for estimation of cooling performance with various battery conditions in this study. For investigation of the battery cooling system, some 1D modeling had been developed and various parametric studies had been conducted. Some specific current values according to driving condition were engaged in the simulation model to estimate cooling performance of this system. The simulations indicate that current cooling system meet the target (under 45℃) when driving conditions like US06, HW and the fastest speed mode and that environmental temperature is also can be critical design factor since an effect of natural convection was pretty critical when we consider natural convection.
배터리 발열체를 활용한 시스템 벤치 평가 및 고전압 배터리 냉매냉각시스템 성능연구
공태윤(Taeyun Kong),임혜수(Hyesu Lim),김화성(Hwasung Kim),임태훈(Taehoon Lim) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Most car makers are trying to implement electric powertrain to enhance fuel efficiency and meet emission regulations. According to the rising industry and environmental demand for electric vehicles, it is crucial for these vehicles to be equipped with a powerful, safe and efficient energy system that can support long-range driving. As a part of the most important electrified vehicle technology, it is essential to equip the battery cooling system which maintain the battery temperature within temperature limit to prevent thermal runaway, power-fade and life cycle-fade. For the long-range driving, capacity and density of electric vehicle battery system are increased, battery cooling performance also should be improved and it has evolved from air cooling to refrigerant indirect liquid cooling technology. The indirect liquid cooling, advanced than air cooling system in cooling performance, is connected in parallel to the climate control system through a chiller unit and cools the battery by secondary coolant loop which cooled by refrigerant of the primary air conditioning loop. The most common type of battery cooling, for production BEV and some of PHEV, is using the liquid cooling. As a method for further improving cooling performance compared to liquid cooling system, a refrigerant indirect cooling system which removes a secondary heat exchange process and cools a battery directly with a refrigerant has been introduced in the previous research and has been applied to a few vehicles. This paper focuses on verifying cooling performance of the refrigerant direct battery cooling system on system test bench stand. A bench test apparatus was constructed to apply refrigerant flow by production car air conditioning system parts and thermal load by electrical heater instead of real battery cells. As a test result, it was confirmed that the cooling performance of refrigerant direct cooling system could be enhanced about 27% in watt unit compare to that of indirect liquid cooling under same test condition.