Patent ID: 11909233
Assignee: DENSO TEN LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A disconnection detection device comprising:
CR filters provided for respective battery cells of a battery pack in which the battery cells are connected in series;
discharge circuits each (i) connected between a battery cell of the battery cells and a CR filter of the CR filters and (ii) discharging the battery cell when cell voltages of the battery cells are made balanced; and
a detection unit configured to:
alternately and successively discharge two of the battery cells that are connected in series and are adjacent to each other;
after a predetermined time has passed from finish of discharge of each of the battery cells, (i) detect a voltage of a first detection line, which detects the voltage at a point between a positive electrode of one of the adjacent battery cells and a negative electrode of another of the adjacent battery cells, and (ii) detect a voltage of a second detection line, which detects the voltage of a negative electrode of the one of the adjacent battery cells; and
detect disconnection of the first detection line based on a difference between the two detected voltages.