| 摘要 |
PROBLEM TO BE SOLVED: To accurately estimate the battery capacity at a designated time of a lithium ion secondary battery to facilitate control of a battery life by calculating the amount of deterioration of capacity during a fixed period according to the charged state, the temperature and the elapsed time. SOLUTION: The speed of deterioration of a battery capacity corresponds to the ratio SOC of the capacity in the full-charged state and the capacity at a designated time and follows the Arrhenius rule. The relationship between the inverse of the absolute temperature of the battery and the deterioration speed of the battery capacity becomes linear on a semilogarithmic graph corresponding to SOC, and the capacity deterioration speed is expressed by expression using two variables, the temperature T and SOC by Arrhenius plotting, to determine the expression for obtaining the Arrhenius plotting for each battery. At every fixed time, the capacity deterioration amount is calculated by the expression from the temperature/SOC, integrated and displayed to be taken as a parameter for battery control. Thus, the capacity deterioration amount of the battery at a fixed time can be accurately grasped to facilitate control.
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