Panasonic Energy Co., Ltd.

Jeewook Chang

Takahiro Kamikawa

Operating electric power is preferably supplied to a battery assembly control circuit from both a power converting device and a battery module. An electricity storage device includes a battery module including battery cells and a battery assembly control circuit, and a power converting device configured to charge the battery module with a commercial power supply and to supply electric power to a load. The power converting device supplies electric power to the battery assembly control circuit while an output voltage of the power converting device is higher than a predetermined voltage. The battery module starts to supply operating electric power to the battery assembly control circuit upon detecting that the electric power from the power converting device starts to be supplied to the battery assembly control circuit. The battery module stops supplying the electric power to the battery assembly control circuit when the battery module stops being discharged.

Electric power supply system for battery assembly control circuit of electricity storage device, and electricity storage device

A failure of battery modules is reliably determined. A power supply device includes: battery modules () each of which included a failure determination unit () configured to determine a failure and a normality and to output the failure and the normality as a High signal and a low signal; a failure transmission line () connected to the failure determination unit () of each battery module (); and a module failure determination circuit () connected to the failure transmission line () and configured to determine failure and normality of the battery modules (). The module failure determination circuit () includes: a voltage determination circuit () configured to determine a High level and a Low level of the failure transmission line (); an impedance detection circuit () configured to detect an impedance with respect to a ground line (); and a calculation circuit () configured to determine the failure and the normality of the plurality of battery modules () and an abnormality of the failure transmission line () based on outputs of the voltage determination circuit () and the impedance detection circuit ().

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Kanagawa, Japan

Jeewook Chang