Mechanism and Online Detection of Micro-Short Circuit in Lithium Batteries
Lithium ion batteries are widely used as ideal storage devices for clean energy,but there is a risk of internal short circuits.The early symptoms of internal short circuits in lithium-ion batteries are not obvious,known as"micro short circuits".After a period of evolution,they will develop into uncontrollable internal short circuits caused by Joule heat.This article studies the theoretical basis of micro short circuit detection based on the micro short circuit mechanism of lithium-ion batteries.It is found that compared with normal batteries,the slope change of the terminal voltage curve of micro short circuit batteries has three characteristics:mutation,non repeatability,and trend.Therefore,it is necessary to detect the micro-short circuit of lithium battery on-line.The simulation results show that the online detection of internal micro short circuits in lithium batteries based on voltage curve slope effectively overcomes the influence of battery parameter differences and provides a new method for detecting internal micro short circuits in batteries.
lithium batterymicro short circuitvoltage curve slopeonline detection
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