Journal
JOURNAL OF ELECTROCHEMICAL SCIENCE AND ENGINEERING
Volume 8, Issue 1, Pages 101-110Publisher
INT ASSOC PHYSICAL CHEMISTS-IAPC
DOI: 10.5599/jese.476
Keywords
Battery characterisation; thermal runaway; gas analysis; heat quantification
Categories
Funding
- Austrian Ministry of Transport, Innovation and Technology (BMVIT)
- Austrian Research Promotion Agency (FFG) through the program Mobilitat der Zukunft
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A method for thermal ramp experiments on cylindrical 18650 Li-ion cells has been established. The method was applied on pristine cells as well as on devices aged by cyclisation or by storage at elevated temperature respectively. The tested cells comprise three types of LiNi(0.8)Co(0.15)AI(0.05)O(2) cells for either high power or high energy applications. The heat flux to and from the cell was investigated. Degradation and exothermic breakdown released large amounts of heat and gas. The total gas and heat emission from cycled cells was significantly larger than emission from cells aged by storage. After aging, the low energy cell ICR18650HE4 did not transgress into thermal runaway. Gas composition changed mainly in the early stage of the experiment. The composition of the initial gas release changed from predominantly CO2 towards hydrocarbons. A comparable mixture of H-2, CO and CO(2)were emitted in all tests during thermal runaway.
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