| Absolute Capacity Estimation Method with Temperature Effect for a Small Lithium-polymer Battery |
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Hankyong Kim, Kiho Kwak |
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The 5th Research and Development Institute, Agency for Defense Development |
| 온도의 영향성을 고려한 리튬폴리머 전지의 절대용량 추정 방법 |
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김한경, 곽기호 |
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국방과학연구소 제5기술연구본부 |
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| Abstract |
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Military devices and systems powered by batteries need to operate at extreme temperature and estimate the available capacity of the battery at different temperature conditions. However, accurate estimation of battery capacity is challenging due to the temperature-sensitive nature of electrochemical energy storage. In this paper, Peukert's equation with temperature factor is derived, and methods for estimating the absolute capacity of lithium-polymer battery and the state-of-charge(SOC) with respect to varying currents and temperatures are presented. The proposed estimation method is experimentally verified under three different discharge currents(0.5 A, 1 A, 3 A) and six different temperatures ranging from -30 to 45 deg. C. The results show the proposed method reduces the Peukert's estimation error by up to 30 % under or at extreme condition. |
| Key Words:
Battery Fuel Guage, Lithium-polymer Battery, Absolute Capacity, Residual Capacity |
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