Research on Over-discharge Cycle Aging and Discharge Heat Generation Characteristics of 21700 NCA Lithium-ion Batteries
The cycle aging experiment of different discharge cut-off voltages was conducted on 21700 NCA lithium-ion batteries.The aging mechanism of lithium-ion batteries under over-discharge cycles conditions was investigated using electrochemical impedance spectroscopy and differential voltage analysis,and the maximum temperature,heat output,maximum heat generation power,and average heat generation power of the over-discharged batteries during discharge were measured in an adiabatic environment.The research findings indicate that over-discharge cycles accelerate battery aging,with loss of lithium inventory as the primary aging mode during over-discharge cycles,following the over-discharge cycles aging process,both the maximum heat generation power and average heat generation power during battery discharge show a noticeable increase.
lithium-ion batteriesover-dischargeelectrochemical impedance spectroscopydifferential voltage analysisbattery heat generation
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