To provide a detecting method and device of a battery voltage capable of judging whether voltage dispersion between cells is in an allowable range or not.
Voltage detecting parts 12a, 2b, 2c, 2d, etc., detect cell voltages of cells 1a, 1b, 1c, 1d, etc., and when the specified voltage is detected, a detected signal 'H' is transmitted, OR judgment and AND judgment of the detected signal 'H' are conducted with an OR judgment circuit 3a and an AND judgment circuit 3b of a logic circuit part 3. When the maximum voltage of the cells is detected when charging of a battery assembly, an OR signal FLG1 is transmitted to a high order ECU 4 from the OR judgment circuit 3a. When the minimum voltage of the cells is detected, an AND signal FLG2 is transmitted to the high order ECU 4 from the AND judgment circuit 3b. The high order ECU 4 measures the time elapsed from the FLG1 to the FLG2, and thereby, the dispersion of the cell voltages is judged.
ARAKI KAZUHIRO
YAMADA YASUO
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