Cyclic Tester of Battery Cells for Electric Vehicles

The paper presents an approach to the designing and implementing of the cyclic battery tester and contains the overview about lithium-ion (Li-ion) batteries, charging/discharging procedures, conditions and protections, which must be secured during the testing process. The main goal was to design the universal converter that is capable of charging and discharging battery cells according to electric vehicles purposes. Our universal charging process offers user-defined parameters, which are required in order to properly test different types of battery cells. The discharging process can be done in two ways: constant current discharging and variable current discharging according to a drive profile. The final result is a fully functional device that communicates with a superior system, which records actual data from the battery tester with the intention of future diagnostics of the state of health of battery cells.