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Study on the effect of tab cooling on the lithium-ion battery pack life cycle

Muthukrishnan K., Ramesh Kumar C.

Archives of Thermodynamics

2024

Vol. 45, no. 2

291--299

Electric vehicles are the future of mobility. Electric vehicles have batteries to store energy and the most common type of batteries used in electric vehicle’s battery packs are lithium-ion cells. These cells have very high energy density and dissipate heat during charging and discharging cycles. There is a need to have an efficient cooling system to dissipate this heat. Bigger-size batteries in four-wheelers use liquid cooling to ensure faster charging and longer battery life. Surface cooling and tab cooling are two popular types of liquid cooling systems for battery packs. Surface cooling is a preferred type of cooling system as it is less complex and cheaper, but it creates a temperature gradient inside the cell which is detrimental to cell life. This work proposes tab cooling as a solution to improve the life cycle of lithium-ion cells. Two sets of the battery pack, one with tab cooling and the other without a cooling system were tested under different conditions for multiple fast charging and discharging cycles until their initial capacity was reduced by 30%. The results show that with tab cooling the battery performed better and battery degradation was reduced.

Development of thermal runaway emissions aftertreatment system (TREAS) of lithium ion batteries

Darnikowski Daniel

Transactions of the Institute of Fluid-Flow Machinery

2023

nr 142

47--59

Lithium-ion batteries are one of the most cost effective portable energy containers. The fire incident involving such battery (often referred as "thermal runaway"), however, poses a great danger to the surrounding, particularly in the matter of emitted substances and their toxicity for human body. The substances found are carbon monoxide and dioxide, hydrogen and hydrogen uoride. Filtration of these substances may be achieved with dry sorbent injection method, which uses calcium hydroxide. Dry injection filtering prototype is manufactured and tested against thermal runaway of the NCM cells. Following parameters are analysed: air flow, sorbet transport, air temperature of the flue gas and concentrations of the substances. Estimated filtering performance of the dry sorbent injection and air dilution at a flow rate of 1600 m3/h and dosage of 1.8 g/s of calcium hydroxide is 99% for HF and 89% for CO2. NMC cell gas production per Wh were respectively 1060.3 mg of CO2 and 11.8 mg of H2. Air speed of above 5 m/s was found sufficient to transfer the sorbent power from the hopper's inlet.