Patent ID: 9459327
Filing Date: 2016-10-04
CPC Classification: B60L,G01R,H01M,Y02E

Claim Text:
1. A voltage measurement device for measuring an output voltage of a battery assembly in which a plurality of cells are connected in series so as to output a desired voltage, the voltage measurement device comprising: voltage addition sections that are respectively provided for the plurality of cells, and that add a predetermined voltage value to output voltages of the cells; voltage detection sections that are provided for respective blocks, and that detect addition voltages which are output voltages of the voltage addition sections corresponding to the cells of the individual blocks wherein the cells are sectioned into the blocks each being constituted by at least one cell; A/D converting sections that are provided for the individual voltage detection sections, and that digitize analog voltage signals of the addition voltages detected by the voltage detection sections; and a control section that is connected through communication lines among the voltage detection sections respectively and outputs voltage measurement request signals to the voltage detection sections respectively, and that acquires the addition voltages detected by the voltage detection sections respectively, subtracts the predetermined voltage value from the acquired addition voltages, and provides voltage values after the subtractions, as the output voltages of the cells, wherein the voltage addition sections include first inverting amplification circuits which amplify the voltages across the positive electrode terminals and negative electrode terminals of the cells and then output the amplified voltages, buffers which are disposed on the output sides of the first inverting amplification circuits, and second inverting amplification circuits which invert polarities by adding the predetermined voltage value to the output signals of the buffers, wherein the voltage addition sections add the predetermined voltage value to the output voltages by adding negative voltage which is the predetermined voltage value to the output voltage which is inverted by the first inverting amplification circuits and by inputting the inverted and added voltages into the second inverting amplification circuits and inverting the inverted and added voltages again.