The designed of online detection system for internal resistance of Li-ion batteries

It was necessary to detect the internal resistance in the application of Li-ion batteries.AC internal resistance test method of the battery was improved.The internal resistance detection method for single battery was used in the internal resistance detection of batteries in series,and the Li-ion batteries internal resistance online detection system was designed.Phase lock loop and benchmark resistance compensating technologies were used to improve the detection precision,the error was less than 10%.