In an electric tool battery, even in a case where poor connection or the like is generated in the wiring between one voltage monitoring element (32) and the cells (S3, S4), it is possible to monitor the voltages of the cells (S3, S4) by another voltage mon...

A BMS and driving method, the BMS including a sensing unit sensing voltages and currents of battery cells and an MCU determining an SOC of the battery cells and controlling charging and discharging based on cell voltages and currents of the battery cells, ...

A battery pack charger detects whether a terminal of the charger is disconnected from a first node between cells of a battery pack docked in the charger. The charger comprises a first resistor connected to the terminal, a second resistor connected in serie...

A determination system (1) for determining whether metal lithium is precipitated in a lithium ion secondary battery (5) includes: a discharging unit (9) that causes the lithium ion secondary battery (5) to perform constant current discharge until a voltage...

A battery apparatus (100) includes a row battery group including a plurality of series-connected row batteries (50a to 50c) including one or more battery cells; a plurality of battery management sections (10a to 10c), corresponding to the individual row ba...

A circuit used to measure cell voltages in a battery pack can include a cell voltage level shifter, a sense block, and a compensation current generator. The cell voltage level shifter selects a cell and shifts the terminal voltages of the selected cell fro...

To provide a small-sized fuel cell system capable of providing a mode having a simple constitution preventing power generation of a fuel cell in an overload state, preventing a deterioration in the fuel cell system and providing a stable output from the fu...