A voltage detecting circuit for a cell combination including one or more cell
blocks
having a plurality of cell modules connected to each other in series, including
voltage detecting lines extending, respectively, from a plurality of voltage detecting
points of the cell combination, of the lines is connected to the ground, and nongrounding
voltage detecting lines are each interconnected through voltage branch lines to
the grounding voltage detecting line. A voltage dividing resistor is interposed
on each of the nongrounding voltage detecting lines and each of the voltage branch
lines. Each of the nongrounding voltage detecting line is connected to a computing
circuit via an analogue-digital converter. The computing circuit calculates voltage
of each of cell modules based on voltage detecting data input from each of the
nongrounding voltage detecting lines. Accordingly, the number of parts is reduced,
voltage detecting accuracy is improved, and disconnection is reliably detected.
