Open AccessExperimental Study to Investigate the Effects of Temperature Rise during Discharge on Li-ion Battery Degradation
Author(s) -
Bin Xu,
Guangrui Wen
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/844/1/012010
Subject(s) - fade , depth of discharge , degradation (telecommunications) , battery (electricity) , thermal , materials science , ion , analytical chemistry (journal) , chemistry , thermodynamics , electrical engineering , environmental chemistry , computer science , operating system , power (physics) , physics , organic chemistry , engineering
Li-ion batteries with higher discharge C-rates show accelerated capacity fade rates. However, an inherent coupling exists between discharge C-rate and temperature as heat generation is inevitable during discharge. The effects of discharge C-rates on capacity fade under consideration of temperatures have not been investigated. This paper presents an experimental study that separates the temperature rise during discharge from the non-thermal effect of discharge C-rates. A design of experiment including two discharge C-rates (C/2 and 3C) and two controlled temperatures (controlled ambient temperature at 45 °C and controlled surface temperature at 45 °C ) were used to provide cycling conditions. In controlled ambient temperature tests at 45 °C, battery surface temperature increased by 5.2 °C at the discharge rate of C/2 and 20.6 °C at 3C. In controlled surface temperature tests at 45 °C, battery surface temperatures were maintained at 45 ±1 °C . Experiment results show that the battery capacity degradation was the joint contribution of the temperature rise and non-thermal effects. Temperature rise during discharge contributes to the battery capacity degradation, while the non-thermal effect of discharge C-rate dominates the capacity loss.