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RISS 인기검색어
- 검색키워드
- 저자 : 채희일 ( Heui-il Chae ) (검색결과 3 건)
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채희일 ( Heui-il Chae ),( Riguang Chi ),이석호 ( Seok-ho Rhi ) 충북대학교 산업과학기술연구소 2019 산업과학기술연구 논문집 Vol.33 No.2
Recently, optimum fin design involved with its geometries is important to improve the heat transfer performance without increasing fin number. When the junction temperature of a semiconductor reach over its maximum allowable design limit, the device will be broken down. One of the common and conventional method to remove the generated heat is using a finned heat sink with high thermal conductive material. And it is directly contacted to the heat source surface of the electronic component. Heat sink usually consists of a flat base with lots of fin arrays to increase the heat transfer area. The greater the surface area, the better it is able to dissipate the heat generated. The most usual cooling methods could be natural or forced convection with typical fluid cooling mediums. In the present study, the non-uniform geometrical pin-fin arrays are studied in terms of effects of fluid flow, different fin geometries, and so on. Three different fin geometries were used to study and compared to each other to determine the most efficient heat transfer performance. The goal of study is to optimize heat transfer performance of the heat sinks studied in a range of configuration based on fin geometries. The simulation shows slight variation with different geometries. The flow direction to the highest fin is allowable to get higher heat transfer performance.
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리튬이온 파우치 배터리 접착용 히팅블럭 히터의 신뢰성 검사
이석호 ( Seok-ho Rhi ),채희일 ( Heui-il Chae ),안재현 ( Jae-hyun Ahn ) 충북대학교 산업과학기술연구소 2020 산업과학기술연구 논문집 Vol.34 No.1
Recently, lithium-ion batteries with new electrolyte materials, structures, and bigger sizes for future electric vehicles have been developed. There is a large emphasis and needs on electrification in the transportation industry replacing classic engines. Due to larger lithium-ion battery cells' needs, the global li-ion battery capacity may become a limiting factor shortly in future automotive industry. Usually, in producing car production, 100 MWh of battery power density equals to the battery installation capacity for 3000 full-electric cars. The main continuous challenges of lithium-ion batteries are related to operating temperatures, material deterioration, power output, and lifetime. Battery reliability related to production process Battery reliability related to the production process such as bonding, contact pressing, thermal processing is essential for a sustainable battery industry. Li-ion pouch battery cell is bonded and sealed in the production line. In the bonding process of the aluminum laminate film, it is related heating and pressing process is important production steps. Two major causes of quality failures in production line are cell leakage and failure in forming cycling. Generally, cell leakage occurs when there are defects in the seals of cells. Tab-lead insulation and pouch bonding are required to heat-seal the cell together with the aluminum pouch film by thermally pressed bonding. In the bonding process, precision heater temperature and heating rate should be controlled. And high precise heater quality is required. In the present study, heater reliability was tested based on the heat transfer principle and the quality was recognized.
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