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

Claim 5:
6. A disconnection detection method comprising:
with discharge circuits each (i) connected between a battery cell of battery cells of a battery pack and a CR filter of CR filters provided for the respective battery cells and (ii) discharging the battery cell when cell voltages of the battery cells are made balanced, alternately and successively discharging 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) detecting 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) detecting a voltage of a second detection line, which detects the voltage of a negative electrode of the one of the adjacent battery cells; and
detecting disconnection of the first detection line based on a difference between the two detected voltages.