Battery Cooling Control

SYSTEM

Battery Cooling Control


DESCRIPTION

Cooling of the Li-ion battery is performed by delivering cooled air from the passenger compartment into the trunk room.
The air from the passenger compartment cools the Li-ion battery, maintaining a suitable battery temperature and improving the lifetime of the Li-ion battery.

AIR FLOW






The air from the passenger compartment passes from the rear parcel shelf through a duct and is sent to the battery cooling fan. The air is then divided for 2 systems (battery module stack and DC/DC converter) to cool the entire battery pack.

CONTROL






The Li-ion battery controller receives the signals from the sensors and control unit, and determines the target airflow. Based on this target airflow, the Li-ion battery controller changes the duty value of the cooling fan drive signal, allowing stepless control of the airflow.
The target fan speed is determined by calculating the vehicle noise state according to the output shaft revolution signal, total power signal, and A/C blower fan speed, based on the temperature signals from the battery temperature sensors, intake temperature sensor, and DC/DC converter.