Circuitry for measurement of cell voltages of multi-cell battery, has switchable line to switch balancing current flow between battery cells, while generating voltage pulse when balancing current flow between two cells starts or stops

摘要

The circuit (30) has voltage measuring unit (12) comprising measuring inputs (13,33) for battery cells (11) and several measuring lines (28,29) for coupling measuring inputs with the terminals (15,16) of the battery cells. A switchable line (37) is provided for switching balancing current flow between battery cells, while a generating unit is provided for generating voltage pulse when the balancing current flow between two battery cells starts or stops. An independent claim is included for method of line fault diagnosis in voltage measurement on a multi-cell battery.