Patent ID: 8140281

Claim:
A voltage detecting device comprising: a plurality of voltage detecting units for detecting a voltage between both terminals of each unit cell, which is secondary battery type, included in respective blocks, the voltage detecting unit being provided for each block of the respective blocks divided from a battery unit formed with a plurality unit cells connected in series to each other; and a control device for receiving a detection result from the voltage detecting unit, wherein the voltage detecting device has a first communication line for connecting the plurality of voltage detecting units in series each other and for connecting between a top end or bottom of the plurality of the voltage detecting units and the control device, wherein the control device transmits an address number of the voltage detection unit to the voltage detecting unit connected through the first communication line, and wherein the respective plurality of the voltage detecting units perform an action for setting an address, the action setting the received address number or an address number adding a predetermined value to the received address number as a self-address number and transmitting an address number adding 1 to the received address number to the first communication line away from the control device when the respective voltage detecting units receive the address number through the first communication line from the control device.