| 摘要 |
PROBLEM TO BE SOLVED: To improve battery cell voltage detection accuracy by correcting for errors in detected battery cell voltage due to an effect of filter circuits.SOLUTION: A voltage detection device comprises; discharge circuits H1-Hn, each of which comprises one of switching elements S1-Sn and one of resistors Ra1-Ran connected in series and is connected in parallel with one of a plurality of battery cells C1-Cn constituting a battery B; filter circuits F1-Fn provided for each of the battery cells C1-Cn to remove noise from voltage fed from the respective battery cells C1-Cn; and voltage detection means D, M which detect voltage of each of the battery cells C1-Cn after the noise is removed by the respective filter circuits F1-Fn. The voltage detection means D, M correct detection results on the basis of duration from the time the switching elements S1-Sn of the discharge circuits H1-Hn are turned off to the time for detecting voltage of the respective battery cells C1-Cn. |
