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니켈-철 전지 전극의 전위 및 전류밀도 분포 예측
Prediction of the Potential and Current Density Distribution within the Electrodes of a Ni-Fe Battery
HWAHAK KONGHAK, December 1996, 34(6), 783-789(7), NONE
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Abstract
니켈-철 전지 전극판에서의 전위와 전류밀도 분포를 계산하고, 이를 통하여 전극의 방전깊이 분포의 변화를 예측할 수 있는 유한요소법에 근거한 전산모사 프로그램을 개발하였다. 각기 전극판의 종횡비와 탭의 위치가 다른 전극들에 대하여 해석을 실시한 바에 의하면, 전극판의 종횡비와 탭의 위치 변화는 전극의 전위와 전류밀도는 분포에 영향을 주어 전극의 방전깊이 분포를 결정함을 알 수 있었다. 전극의 방전깊이의 분포를 균일하게 함으로써 전극의 활물질 이용률을 높이고 전지의 수명을 연장하기 위하여는 전극형상 설계의 최적화가 필요함을 확인할 수 있었다.
A computer simulation program based on the finite element method was develped in order to calculate the potential and current density distribution for the electrodes in a Ni-Fe battery, through which the depth of discharge(DOD) distribution and variation with time could be predicted. The analysis on the electrodes of different aspect ratios and tab positions revealed that the aspect ratio and the tab position influence the potential and current density distribution, thus affecting the DOD distribution within the electrode. As a result, it was found that an optimization for the design of an electrode shape is necessary to make the DOD distribution more uniform and to enhance the utility of the active material of an electrode influencing the cycle life of a battery.
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