Patent ID: 8330469

Claim:
A battery voltage monitoring apparatus for monitoring an assembled battery voltage, the assembled battery including a plurality of battery cells, said battery voltage monitoring apparatus comprising: a plurality of input terminals, each input terminal connected to the plurality of battery cells respectively through a potential measurement line; a voltage sensor connected to plurality of input terminals the voltage sensor detecting a potential of the plurality of battery cells; an output logic circuit outputting a potential detect signal based on an output of the voltage sensor, the potential detect signal representing that an abnormal potential is detected; and a current source, wherein the voltage sensor comprises: a reference voltage generating circuit generating a reference voltage; and a comparator having a hysteresis characteristic and comprising a first terminal and a second terminal, the second terminal inputting the reference voltage, and wherein one end of the current source is connected between the one of the plurality of input terminals and the first terminal, and the output of the voltage sensor is generated based on an output of the comparator.