US 11,913,997 B2
Voltage detection apparatus
Tomomichi Mizoguchi, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Aug. 27, 2021, as Appl. No. 17/459,308.
Application 17/459,308 is a continuation of application No. PCT/JP2020/007545, filed on Feb. 25, 2020.
Claims priority of application No. 2019-036809 (JP), filed on Feb. 28, 2019.
Prior Publication US 2021/0389380 A1, Dec. 16, 2021
Int. Cl. G01R 31/3835 (2019.01); H02J 7/00 (2006.01)
CPC G01R 31/3835 (2019.01) [H02J 7/0048 (2020.01)] 12 Claims
OG exemplary drawing
 
1. A voltage detection apparatus that is applicable to an assembled battery that has a series-connection body of a plurality of battery cells, wherein:
the plurality of battery cells are divided to configure a plurality of detection blocks;
the voltage detection apparatus includes
a capacitor,
an input-side switch that connects the detection block to the capacitor in parallel, and opens and closes between the detection block and the capacitor,
a first differential voltage detection circuit that detects a voltage of the capacitor and outputs a first voltage based on the voltage of the capacitor,
a second differential voltage detection circuit that detects the voltage of the capacitor and outputs a second voltage based on the voltage of the capacitor,
an output-side switch that opens and closes between the capacitor, and the first differential voltage detection circuit and the second differential voltage detection circuit,
a reference voltage supplying unit that has a plurality of output terminals, supplies a first reference voltage to the first differential voltage detection circuit from a first output terminal among the plurality of output terminals, and supplies a second reference voltage to the second differential voltage detection circuit from a second output terminal,
a fault determining unit that has a plurality of input terminals, in which the first voltage is inputted to a first input terminal among the plurality of input terminals and the second voltage is inputted to a second input terminal, and that determines a fault in the first differential voltage detection circuit or the second differential voltage detection circuit based on the first voltage and the second voltage, and
a voltage output circuit that is supplied a third reference voltage from a third output terminal that is positioned between the first output terminal and the second output terminal in the reference voltage supplying unit, among the plurality of output terminals, and outputs a third voltage to a third input terminal that is positioned between the first input terminal and the second input terminal in the fault determining unit, among the plurality of input terminals; and
the third reference voltage is set to a voltage that differs from each of the first reference voltage and the second reference voltage, and the third voltage is set to a voltage that differs from each of the first voltage and the second voltage.