Security electronics for battery cell of battery cell monitoring unit, has comparator which produces alarm signal in dependence of comparison of prognosticated battery cell voltage with battery cell momentary voltage

摘要

The electronics (400) has a battery cell internal resistance input port (318) for inputting battery cell internal resistance value (316), and a battery cell open circuit voltage input port (322) for inputting battery cell open circuit voltage value (320). A comparator (402) determines the prognosticated battery cell voltage from battery cell open circuit voltage value, battery power instantaneous value (411) and internal resistance value, and produces the alarm signal (312) in dependence of comparison of prognosticated battery cell voltage with battery cell momentary voltage. Independent claims are included for the following: (1) battery cell monitoring unit; and (2) battery system.