Input/Output Signal Item: Description

The Li-ion battery controller performs control as follows:

• Monitors the battery state and transfers chargeable/dischargeable power to VCM (vehicle control module) to prevent an error, such as overvoltage, over discharge, overcurrent, and an excessive temperature rise in the battery.
• Detects an error (overvoltage, over discharge, overcurrent, or excessive temperature rise) immediately at the time of error occurrence and requests the system main relay shutoff to VCM to shut off the discharge/charge line.
• Maintains the optimum battery state constantly with a cell capacity adjustment function to prevent a reduction in charging/discharging capacity caused by cell capacity variations.
• Detects the connector fit state with the function to detect the fit of the high voltage harness connector and transfers the detected state to VCM so that the vehicle does not start with an unsteady state.
• Detects the insulation resistance state with the function to detect the insulation resistance between high and low voltage and transfers the detected state to VCM so that the vehicle does not start with an unusual state.
• Estimates a battery charge state and low battery state, based on the data obtained with the battery state detection function, and reflects on the battery capacity meter.