Safety risks of high-temperature float-charging induced swelling in lithium ion batteries
Float charging is a widely employed method for charging lithium ion batteries(LIBs)in portable electronic devices such as smartphones and laptops.However,in high-temperature environ-ments,float-charging often precipitates a decline in capacity and battery swell,raising consumer con-cerns regarding product safety.To elucidate the ramifications of high-temperature float aging on bat-tery safety,this study selected five commercially available pouch LIBs from the same manufacturer for aging experiments.The swollen batteries underwent heating tests,external short-circuit tests,and extrusion tests,with an analysis of gas composition.High-temperature float-charge aging conditions for LIBs expedite gas production and capacity degradation.Gas production causes battery swelling,increasing rupture and leakage risk.The small amount of flammable gas produced has minimal im-pact on risk.A comparative analysis revealed that although the electrochemical performance of swol-len batteries decreased,their safety remained robust in typical electronic product usage environ-ments,with a low risk of thermal runaway.
lithium ion batterysafety riskshigh-temperature float chargingthermal runaway
万方数据
维普
