New Li-ion Battery Evaluation Research Based on Thermal Property and Heat Generation Behavior of Battery
- Received Date: 2012-09-13
- Li-ion battery, Energy loss, Heat, Cell resistance, Polarization, State of charge prediction
Abstract: We do a new Li-ion battery evaluation research on the effects of cell resistance and polariza-tion on the energy loss in batteries based on thermal property and heat generation behavior of battery. Series of 18650 cells with different capacities and electrode materials are evalu-ated by measuring input and output energy which change with charge-discharge time and current. Based on the results of these tests, we build a model of energy loss in cells' charge-discharge process, which include Joule heat and polarization heat impact factors. It was reported that Joule heat was caused by cell resistance, which included DC-resistance and reaction resistance, and reaction resistance could not be easily obtained through routine test method. Using this new method, we can get the total resistance R and the polarization parameter η. The relationship between R, η, and temperature is also investigated in orderto build a general model for series of different Li-ion batteries, and the research can be used in the performance evaluation, state of charge prediction and the measuring of consistency of the batteries.
|Citation:||Zhe Lv, Xun Guo, Xin-ping Qiu. New Li-ion Battery Evaluation Research Based on Thermal Property and Heat Generation Behavior of Battery[J]. Chinese Journal of Chemical Physics , 2012, 25(6): 725-732. doi: 10.1088/1674-0068/25/06/725-732|