Battery temperature estimation method and system

A method of estimating a battery temperature based on shared coolant between a vehicle and a battery charging device during battery charging, the method comprising:

• collecting vehicle information including a voltage, a state of charge (SoC), and a target charging current of a battery of the vehicle;
• collecting charging device information including a coolant temperature and a charging current in the battery charging device;
• estimating minimum and maximum temperatures of the battery through machine learning based on the vehicle information and the charging device information;
• and
• determining whether to heat or cool the coolant in the battery charging device based on data regarding the minimum and maximum temperatures and SoC of the battery.

A system for estimating a battery temperature, the system comprising:

• a vehicle controller provided in a vehicle and configured to collect vehicle information including a voltage, a state of charge (SoC), and a target charging current of a battery of the vehicle;
• and
• a charging device controller provided in a battery charging device and configured:
• to collect charging device information including a coolant temperature and a charging current in the battery charging device,
• to estimate minimum and maximum temperatures of the battery through machine learning g based on the vehicle information and the charging device information, and
• to determine whether to heat or cool coolant based on data regarding the minimum and maximum temperatures and SoC of the battery.