| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a measurement method and device of pure resistance of on board battery wherein the pure resistance of the battery can be measured even if the vehicle is in use. SOLUTION: During the period in which monotonously decreasing rush current to flow after monotonously increase from 0 to the peak value in a constant load prescribed beforehand among loads of the vehicle, discharging current of the battery and this terminal voltage corresponding to this discharging current are periodically measured by a current/voltage measurement means 23a-1. The first approximation equation of current-voltage characteristic against increasing discharging current and the second approximation equation of current-voltage characteristic against decreasing discharging current are calculated by an approximation equation calculating means 23a-2. In case voltage reduction by concentration polarization component is included, an intermediate value of two terminal voltage change values per unit current change at the point corresponding to the peak value of the first and the second approximation equations excluding this voltage reduction is calculated by a calculating means 23a-3, and the measurement is made as the pure resistance value of the battery.</p> |
