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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.
이석호 ( Seok-ho Rhi ),오범진 ( Bumjin Oh ),안재현 ( Jae-hyun Ahn ) 충북대학교 산업과학기술연구소 2020 산업과학기술연구 논문집 Vol.34 No.1
In the present paper, the design and development of spring loaded rotary peristaltic pump was proposed. Basic characteristic studies on the working principle and the dynamic motion of peristaltic pump are provided. The theoretical simulation for the flow rate and spring motion of pump are presented. The current model consists of spring loaded peristaltic pump, coupling and geared variable speed motor. In the present spring loaded peristaltic pump is mechanical displacement pump that induce consistent volumetric flow in a fluid filled and flexible walled conduit through peristalsis transport due to traveling contraction waves. Hence, Peristaltic pumping to move fluid volume is an inherently multiphysics problem where the tube deformation and the pumped fluid are strongly coupled. We investigated the performance of a 180 degree rotary peristaltic pump with two metallic rollers which are compressed and expanded by spring loading and rotor rotated motion, and an elastomeric tube pumping a viscous Newtonian fluid. The simulation model shows the peristaltic wavy flow that result when the rollers engage and disengage the tube with the contact interaction between the rollers and the tube by spring motion. In the present study, spring stiffness affect the flow fluctuation. With k=5,000 N/mm, the present pump shows the optimized stable operation.
( Rui Yang ),이석호 ( Seok-ho Rhi ),김기범 ( Kibum Kim ) 충북대학교 산업과학기술연구소 2020 산업과학기술연구 논문집 Vol.34 No.2
Heat management directly affects the performance of a fuel cell system. A simulation study was conducted to investigate design factors affecting the performance of the fuel cell and validate the feasibility of heat pipe for heat management of the system. The results reveal that the heat pipe could provide more effective way for cooling fuel cell. An existing PEM fuel cell stack producing 200 W in power could have the optimum efficiency when system cooling was accomplished with a heat pipe having the optimal length (90 mm) and diameter (15 mm). In addition, heat resistance in a heat pipe increases with the length of the condenser but decreases with increasing the pipe diameter. Among many limits, the boiling limit of the heat pipe is the most significant factor to affect heat dissipation of the heat pipe.
이원국 ( Won Gook Lee ),이석호 ( Seok Ho Rhi ),이계복 ( Kye Bock Lee ) 충북대학교 산업과학기술연구소 2012 산업과학기술연구 논문집 Vol.26 No.1
Liquefied natural gas(LNG) is carried and saved as a liquid below 100K. But LNG must be vaporized for using like fuels in industries, home and so on. The vaporizer used at the domestic station is almost by the air vaporization method. In case of air type, the freezing moisture of air is created by temperature drop under 273K on vaporizer surface. The freezing moistrue makes ice layer and heat transfer on vaporizer decreases by the ice layer formation. The numerical analysis has been carried out to obtain the frost layer growth and the optimum design information of vaporizer fin for LNG under super low temperature.