High-precision battery test system based on 24-bit ADC

This paper presents an intelligent secondary battery test system based on a 24-bit high-resolution ADC ADS1211. We adopt ultra-high precision voltage reference AD780 and 24-bit ADC ADS1211 to ensure high-precision measurement. The system utilizes a micro-controller to intelligently set the parameters of channel state control circuit, switch charge-discharge mode, switch voltage and current feedback, control voltage and current sampling, test internal resistance of a battery cell, measure the ambient temperature, etc. This system achieves the functions of testing rechargeable battery, including constant current charge, constant voltage charge, constant current discharge and static performance, and the high precision measurement of secondary battery parameters. Furthermore, based on the test result we can analysis the comprehensive performance of the secondary battery and achieve a reasonable battery match to play the best performance. The main characteristics of the system are simple circuit, low cost, multi-function and high precision.