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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.
공태윤(Taeyun Kong),기재용(Jaeyong Kim),소원섭(Wonsub So),박성욱(Sungwook Park),정순안(Sunan Jeong) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The RCAR has been established in order to reduce maintenance costs and insurance rate of vehicle. Total cost of ownership of the vehicle is sum of the costs of the purchasing and operating, it is an important factor affecting sales. Some tests such as 40% offset 10dgree rigid wall are performed by RCAR to estimate the damageability and repairability of vehicle. And the insurance rate is determined by test results. Vehicle manufacturer and component supplier have tried to reduce insurance rate and repair cost. In this paper, the movable cooling module mounting solution has been developed that can protect the expensive components such as cooling module from damage in low speed crash. The RCAR low speed crash test result conducted by using crash cart and vehicle, cooling module did not damage. Mass production vehicle was assessed by KART (Korea Insurance Repair Research and Training Center) in 2010.
Front End Carrier의 상부 구조에 따른 강성 비교 연구
박성욱(Sungwook Park),공태윤(Taeyun Kong),김재용(Jaeyong Kim),소원섭(Wonsub So) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Front End Module is assembled to the front area of the vehicle. In the case of front crash, the Front End Module should be able to absorb the impact and the deformation of Front End Module should be minimized. If the vehicle’s hood deformed by crash is opened, it can make the wind shield of vehicle broken and injure passengers. Because deformed and opened hood can cause the additional accidents, the stiffness supporting hood is very important. The stiffness of all developed vehicles must be verified in the development stage through Hood Latch Retention Test. And the test must be controlled strongly. The stiffness supporting hood & latch has the relationship with the Front End Carrier’s upper structure. The Higher inertia of Upper Section is advantageous, but the upper section can not be secured often because of vehicle’s styling or engine room layout or limitation of cost & weight , ETC, and these factor is different according to the vehicles We have developed several vehicle’s Front End Module since 1999 and we will introduce some kinds of knowhow from the development history of 2 vehicle’ Front End Module.
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.
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.
딤플에 의한 루우버휜 열교환기의 공기측 압력강하, 열전달 및 배수 성능향상
강희찬(Hiechan Kang),오현식(Hyun-sik Oh),임무기(Moogi Lim),공태윤(Taeyun Kong),박성욱(Sungwook Park),정순안(Sunan Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The present study proposed a dimpled louver fin by adding dimpled slots between the end region of louver fin and the brazing line of the flat to reduce flow resistance and enhance drainability. Numerical simulations were conducted for the conjugated heat transfer of 2 kinds of fin geometry by using the commercial CFD code. The drainability was tested for the four enlarged plastic models made by the rapid prototype machine. The dimpled louver fin showed 14% less airflow pressure drop coefficient than the baseline louver fin, the advantage increasing at low air velocity. The dimpled louver fin shows up to 5% higher than the baseline fin in the performance index of the heat transfer capability per unit temperature potential for the same fan power. The dimpled louver fin drained water better and held substantially less than the baseline fin in the deep test.