September 07, 2022
A Mizzou 糖心Vlog传媒 team has devised a new way to determine how many times you can recharge a lithium-ion battery before it needs to be replaced.
Lithium-ion batteries are common in electronics such as laptops, and they鈥檙e a key component to getting electric vehicles on the roads. They can be recharged hundreds of times, but at some point, they鈥檒l run out of charging cycles. That could be bad news if, say, you鈥檙e traveling, and your electric vehicle can no longer be recharged.
鈥淟ithium-ion battery capacity decreases whenever we use it, and at some point in time, we鈥檙e going to have to replace it with a new one,鈥 said Kangwon Seo, assistant professor of industrial and manufacturing systems engineering. 鈥淚f we can find out when it will essentially fail, then we can better prepare.鈥
Traditional methods to determine how long lithium-ion batteries last have relied on historical degradation data and theoretical assumptions. But that doesn鈥檛 take into account real-world factors such as temperature and voltage.
鈥淲hen we start running our laptop on battery, the temperature rises,鈥 said MD Shoriat Ullah, MS IE 鈥20, who worked on this research as part of his master鈥檚 program. 鈥淚f you start streaming videos on your phone, the temperature rises, and the battery will die faster. In the past, most studies haven鈥檛 considered those other parameters.鈥
And the few studies that have looked into those factors relied only on averages.
The novelty of Seo and Ullah鈥檚 work is that they applied a functional principal component analysis to assess the range of factors such as fluctuating temperatures and voltage.
鈥淭he most important feature is the functional data analysis,鈥 Seo said. 鈥淲e wanted to reflect the shape of the function, not just the mean value. In this research, we really wanted to suggest that we need to consider the shape, not just the mean, for more accurate prediction.鈥
Seo and Ullah outlined their method in the journal of .
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