Patent ID: 8463562

Claim:
A detecting device which detects abnormality of an electric storage device having a plurality of blocks which are connected in series, each block having one or a plurality of electric storage units, the detecting device comprising: a voltage sensor which detects a block voltage of each block during increases and decreases of each block voltage during charging and discharging of the electric storage device; a comparator which compares the detected block voltage of each block with a threshold voltage selected from a normal voltage change range of the blocks during charging and discharging of the electric storage device; a measurement unit which measures a current value of the electric storage device substantially simultaneously after the comparator detects the block voltage is equal to the threshold voltage, for each block; a determining unit which stores the measured current value that is measured substantially simultaneously after the comparator detects the block voltage is equal to the threshold voltage, for each block, and calculates a representative current value of each block after storing two or more current values for each block, wherein the stored current values include values measured at times when the electric storage device is being charged and discharged; and a detecting unit which, after the calculation of a representative current value for different blocks, detects abnormality of the electric storage device by comparing of the representative current values of different blocks to one another, and determining whether a deviation between representative current values is greater than a threshold value.