METHOD AND SYSTEM FOR ONLINE ESTIMATING INTERNAL RESISTANCE OF BATTERY

摘要

A method and a system are provided for online estimating internal resistance of battery. The system includes: a high-voltage battery pack for providing high-voltage DC power, a voltage detection unit for detecting the total voltage of the high-voltage battery pack, a current detection unit for detecting the total current of the high-voltage battery pack, a secondary battery for providing low-voltage DC power, a DC/DC conversion unit for conversing the high voltage DC power to a low voltage DC power and transferring the latter to the secondary battery, a drive unit for driving the vehicle, an on-board charging unit for charging high-voltage battery pack, and a control unit. The control unit controls the system to measure information of a constant current and a corresponded voltage difference of the battery pack at the moment the constant current happened before and after, and then to calculate internal resistance of the battery pack.

主权项

1. A system for online estimating internal resistance of battery, suitable for electric vehicles and hybrid electric vehicles, comprising:
a high-voltage battery pack configured to provide high-voltage DC power to a vehicle; a voltage detection unit configured to detect the total voltage of the high-voltage battery pack; a current detection unit configured to detect the total current of the high-voltage battery pack; a DC/DC conversion unit configured to converse the high voltage DC power to a low voltage DC power; a drive unit configured to drive the vehicle; an on-board charging unit configured to charge high-voltage battery pack; and a control unit, connected to the voltage detection unit, the current detection unit, the DC/DC conversion unit, the drive unit and the on-board charging unit, is configured to calculate an internal resistance of the high-voltage battery pack according to the total current and a difference relating to the total voltage.