| 摘要 |
PROBLEM TO BE SOLVED: To precisely grasp a degradation of electricity accumulation device for a long time without being affected by environmental temperature or fluctuation of a load. SOLUTION: In the case, the amount of the fluctuation per unit time is lower than the reference value, the increment of internal resistance of a battery is calculated, and the increment of the internal resistance is subjected to the averaging procedure (S4); in the case, the number of times of the averaging procedures reaches to the prescribed times, the degradation degree SOH1 is calculated by using the averaged increment of the internal resistance (S6); the calculation for degree of degradation SOH2 is started by the Arrhenius equation wherein, the degree of degradation SOH1 is used as an initial value; the present degradation speed Ka is calculated (S9), if the conditions that the data of the terminal voltage V, current I, temperature T are inputted, and the ECU power source is ON are satisfied; and the present degree of degradation SOH2 is calculated (S10) by the integration of the Arrhenius equation. Thereby, the degradation of the electricity accumulation device can be precisely grasped for the long time without being affected by the environmental temperature or the fluctuation of the load. COPYRIGHT: (C)2007,JPO&INPIT
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