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방전 및 휴지기에서의 납축전지 성능예측
Prediction of the Performance of Lead Acid Cell during Discharge and Rest Period
HWAHAK KONGHAK, April 1999, 37(2), 336-343(8), NONE
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Abstract
납축전지의 고율방전과 저율방전 특성을 알아보기 위해 상온에서의 실험결과와 모델을 사용하여 계산한 결과를 비교하였다. 거시적 균질 모델을 기초로, 음극전극에서의 확산-석출 반응을 고려하여 전해액 농도의 영향을 포함하는 수학적모델을 개발하여, 방전과 휴지기에서의 전해액 농도, 기공률 변화, 전지 전압의 변화 등을 알아보았다. 상온에서의 방전실험결과는 본 모델을 사용하여 계산한 결과가 실험값에 잘 일치하였다. 저온상태에서 고율로 방전하는 경우 양극전극에서의 활물질 이용도는 매우 낮았으며, 양극전극과 전해액층 사이의 계면, 음극전극과 격리판 사이의 계면부근에서의 저항이 전지 성능을 좌우하였다.
The discharge performance of the lead acid cell at high and low current densities was observed to verify the model by comparing the experimental results at room temperature with numerically predicted values. Our model was based on the macroscopic homogeneous model and considered the diffusion-precipitation reaction in the kinetics of the negative electrode and the effect of the electrolyte concentration. The change of the electrolyte concentration, porosity variation and cell voltage behavior during discharge and rest period were examined. The discharge current was high at low temperature, the active material utilization of the positive electrode was very low and the performance of the cell was controlled by the mass transfer resistances between the positive electrode and the reservoir, and between the separator and the negative electrode.
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