Patent ID: 9575134
Date: 2017-02-21
CPC Classifications: G01R

Claim:
1. An assembled-battery voltage detection device comprising: a plurality of single-battery voltage detection circuits configured to detect a voltage at each single battery of an assembled battery in which a plurality of single batteries are connected in series; single-battery voltage detection terminals that are provided in the single-battery voltage detection circuits and connected to ends of the single batteries; connectors configured to connect the single-battery voltage detection terminals and the single batteries; a first voltage detection terminal configured to detect a voltage at a first single battery of the plurality of single batteries located at a first end in the assembled battery through a first connector; a second voltage detection terminal configured to detect a voltage at a second single battery of the plurality of single batteries located at a second end in the assembled battery through a second connector; an assembled-battery voltage detection circuit configured to detect a potential difference between the first voltage detection terminal and the second voltage detection terminal; a single-battery voltage sum calculator configured to calculate a sum of the voltages detected by the plurality of single-battery voltage detection circuits; an end-battery voltage abnormality determination unit configured to determine whether the voltages at the first single battery and second single battery located respectively at the first end and second end are 0 V, the voltages at the plurality of single batteries being detected by the plurality of single-battery voltage detection circuits; and an abnormality output unit configured to, when the end-battery voltage abnormality determination unit determines that the voltages at the first single battery and second single battery respectively located at the first end and second end are 0 V, output a disconnection abnormality signal when the voltage sum calculated by the single-battery voltage sum calculator does not agree with the potential difference detected by the assembled-battery voltage detection circuit, and output a short-circuit abnormality signal when the voltage sum agrees with the potential difference, wherein the first end and the second end are located at opposite sides of the assembled-battery voltage detection device.