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하상현,Ha, Sang-Hyeon 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.6
For the development of reliable thermal batteries, electrolyte is quite important because it is closely related to the performance and stability of thermal batteries. This paper describes general image processing method used for the inspection of molten-salt based electrolyte disk and also describes how we can apply this image processing method to the inspection of thermal battery electrolyte. Moreover we have found optimized image processing conditions to improve the discriminating ability of compaction defects such as non-uniform parts in an electrolyte.
상변화 물질을 이용한 열전지 단열성능 향상에 관한 연구
이재인,하상현,김기열,정해원,조성백,Lee, Jaein,Ha, Sang-hyeon,Kim, Kiyoul,Cheong, Haewon,Cho, Sungbaek 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.4
Thermal batteries are primary reserve power sources, which are activated upon the melting of eutectic electrolytes by the ignition of heat sources. Therefore, sufficient thermal insulation is absolutely needed for the stable operation of thermal batteries. Currently, excessive amount of heat sources is being used to compensate the heat loss in the cell stack along with the insertion of metal plates and thermal insulators to reserve heat at the both ends of cell stack. However, there is a possibility that the excessive heat flows into the cell stack, causing a thermal runaway at the early stage of discharge. At the same time, the internal temperature of thermal batteries cannot be maintained above the battery operating temperature at the later stage of discharge because of the insufficient insulation. Therefore, the effects of Phase Changing Material(PCM) plates were demonstrated in this study, which can replace the metal and insulating plates, to improve the thermal insulation performance and safety of thermal batteries.
4D Lookup Table Interpolating을 이용한 단위 전지 방전 시험 기반 열전지 성능 예측
박병준,김지연,하상현,조장현,Park, Byeong June,Kim, Ji Youn,Ha, Sang Hyeon,Cho, Jang Hyeon 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.6
For comparison to the Li-ion battery, evaluating a thermal battery must consider additional variables. The first one is the temperature difference between the battery and its unit cell. Thermal batteries and their unit cells have a temperature difference that is caused by the thermal battery activation mechanism and its shape. The second variable is the electrochemical reaction steps. Most Li-ion batteries have a constant electrochemical reaction at the electrode, and battery voltage is affected when the concentration of Li ions is changed. However, a thermal battery has several steps in its electrochemical reaction, and each step has a different potential. In this study, we used unit cell discharge tests based on interpolating a 4D lookup table to estimate the performance of a thermal battery. From the test results, we derived an estimation algorithm by interpolating the table, which is queried from specified profile groups. As a result, we found less than a 5 percent difference between estimation and experiment at the 1.3 V cut-off time.
민경일(Kyung-Il Min),하상현(Sang-Hyeon Ha),이수원(Su-Won Lee),문영현(Young-Hyun Moon) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This paper presents a new systematic approach to find a global solution to economic dispatch (ED) with multiple fuel units using a function merger (FM). Currently, no systematic approach has been developed to find a global solution to economic dispatch with multiple fuel units. Various heuristic methods have been proposed, however it is almost impossible to guarantee a global solution by those methods yet. The proposed method uses the FM and λ-P functions. A FM merges several fuel cost functions into one that satisfies the optimal conditions of an ED. The FM procedures are described in detail with illustrative examples.
閔庚一(Kyung-Il Min),河尙賢(Sang-Hyeon Ha),李洙原(Su-Won Lee),文永鉉(Young-Hyun Moon) 대한전기학회 2008 전기학회논문지 Vol.57 No.6
This paper presents a buswise transmission loss allocation algorithm utilizing the transaction strategy. We prove that whatever calculated by any transaction strategy, the total of the allocated transmission losses of each bus, including no-load loss allocation, almost equals the total loss of AC power flow algorithm and the loss is perfectly slackbus-independent, In this paper, the allocated transmission losses of each bus is calculated by the method of integrating loss sensitivities using by the load level parameter λ. The performance of the proposed algorithm is evaluated by the case studies carried out on the WSCC 9-bus and IEEE 14-bus systems.
조광연,류도형,신동근,임경훈,진은주,김현이,하상현,최종화,Cho, Kwang-Youn,Riu, Doh-Hyung,Shin, Dong-Geun,Lim, Kyoung-Hoon,Jin, Eun-Ju,Kim, Hyoun-Ee,Ha, Sang-Hyeon,Choi, Jong-Hwa 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6
Lithium salt have been used mainly as electrolyte of thermal battery for electricity storage. Recently, The 3phase lithium salt(LiCl-LiF-LiBr) is tried to use as electrolyte of thermal battery for high electric power. It is reported that LiCl-LiF-LiBr salt have high ion mobility due to its high lithium ion concentration. Solid lithium salt is melt to liquid state at above $500{^{\circ}C}$. The lithium ion is easily reacted with support materials. Because the melted lithium ion has small ion size and high ion mobility. For the increasing mechanical strength of electrolyte pellet, the research was started to apply ceramic filter to support of electrolyte. In this study, authors used SiOC web and glass fiber filter as ceramic mat for support of electrolyte and impregnated LiCl-LiF-LiBr salt into ceramic mat at above $500{^{\circ}C}$. The fabricated electrolyte using ceramic mat was washed with distilled water for removing lithium salt on ceramic mat. The washed ceramic mat was observed for lithium ion reaction behavior with XRD, SEM-EDS and so on.