Battery charge state calibrator of battery management system for electric automobile

The utility model discloses a battery charge state calibrator of a battery management system for an electric automobile. A FLASH data storage unit inside an MCU (microprogrammed control unit) is used for prestoring battery characteristic curves and battery charge-discharge history to provide reference data for calibration algorithm. A CAN (controller area network) communication module of the MCU is connected with a CAN bus interface of the battery management system after being subjected to level switch by a CAN transceiving device, reads messages of BMS (battery management system) about dump energy, analyzes parameter values of the battery charge state, and writes and saves the parameter values of the battery charge state in an EEPROM (Electrically Erasable Programmable Read-Only Memory) data storage unit; the MCU is matched with a temperature sampling circuit and a current sampling circuit to collect power battery parameters through an AD (analogue-digital) conversion module; a CAN module calibrates the battery charge state of the EEPROM data storage unit through the CAN transceiving device; the calculated electric quantity value is calibrated to remind a diver through an LCD display screen; therefore, the driver is guided to carry out right driving behavior under different working conditions, the accidents and economic loss of the electric automobile caused by energy problems can be reduced.