Patent ID: 11881566
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 7:
8. A battery pack monitoring system for monitoring a battery pack including multiple cell groups, each of which is formed of multiple battery cells connected in series in multiple stages, and an inter-group wiring connecting a high voltage side cell group and a low voltage side cell group connected in series and adjacent to each other in the multiple cell groups, the battery pack monitoring system comprising:
a first wiring connected to a positive electrode of each battery cell;
a second wiring connected to a negative electrode of each battery cell;
an RC filter formed of a resistor and a capacitor, the resistor being provided at a positive electrode side of the battery cell in the first wiring, and the capacitor being connected between the first wiring and the second wiring; and
a voltage monitoring device including a voltage detector connected between the first wiring and the second wiring for monitoring a voltage of each battery cell, wherein:
the voltage monitoring device includes therein a series circuit of a discharging switch and a reverse flow preventing element, the series circuit being provided between two second wirings connected to the negative electrodes of the battery cells connected in series and adjacent to each other;
the first wiring, the second wiring and the discharging switch of the series circuit are connected also to both ends of the inter-group wiring; and
the second wiring connected to each battery cell is provided with a discharging resistor at a position where a charged electricity of the capacitor forming the RC filter is not discharged.