| 摘要 |
<p>An abnormality detecting system sequentially compares the output voltages of n-piece battery cells that are connected in series, with a criteria voltage, at respective points in time Tv1 - Tvn, and produces a determination signal indicative of the presence or absence of any battery cell whose voltage becomes lower than the criteria voltage at time Tvc. The battery current Ib is sampled a predetermined number of times at intervals of a predetermined sampling cycle period ?Ti. The current sampling times Ti1 - Ti3 are provided within a period that lies inside a voltage sampling period Ta - Tb including the above-indicated times Tv1 - Tvn, with a given period of time (?Ti - 2) or less provided at each side of the period. When detecting an increase in the internal resistance based on a comparison between the maximum value of the current sampling values and a criteria current, the abnormality detecting system corrects the criteria current in view of a current variation in a half of the sampling cycle period due to current ripple.</p> |
