Abstract: The electrical characteristics were analyzed using three experimental methods with a commercial 20-Ah polymer lithium-ion battery. The first method is a conventional test, in which the voltages are measured as the steady open-circuit voltages after 12-h rest at different state of charge. The second is the rapid test for measurement of open circuit voltages during the charge and discharge pulse with 1-min rest, with the third being the constant-current pulse test with 30-min rest for parameter identification based on the equivalent circuit model. The measurement results show that the constant-current pulse method with 30-minutes relaxation is effective to derive both the open-circuit voltage (OCV) curve and the electrical parameters.

Key words: polymer lithium-ion batteries, electrical characteristics, tests, model, parameters