US Patent 9669723 Power storage device, power system and electric vehicle

An electronic storage module includes a plurality of batteries, a primary monitoring circuit configured to detect an operating state of the plurality of batteries, a microcontroller unit connected to the primary monitoring circuit via a primary communication path, and a secondary monitoring circuit connected to the microcontroller unit via a secondary communication path. The secondary monitoring circuit is configured to detect the operating state of the plurality of batteries when a determination is made of an abnormality in the primary communication path, or an abnormality in the operating state of the primary monitoring circuit.