Battery diagnosis device, battery diagnosis method, and battery diagnosis program
The purpose of this invention is to make it possible to accurately assess the degradation state of a storage battery within a practical time. This battery diagnosis device acquires a first variation of the voltage value of a storage battery during a rest period after the storage battery has been subjected to a charge operation and calculates a degradation state that does not include the influence of the internal resistance of the storage battery on the voltage value by removing the influence of the internal resistance from the first variation (see FIG. 8).