通信备电用锂离子电池组浮充失效机理OA

Float charging is a commonly used method for communication power backup.However,there is still limited research on the effect of float charging on battery performance.Lithium iron phosphate(LiFePO4)Li-ion battery packs(51.2 V,100 Ah)are acted as the research objects for exploring the impact of float charging methods at different depth of discharge(DOD)on battery performance.Firstly,the float charging process of the battery packs at different DOD is analyzed by differential voltage analysis(DVA).The peak position analysis results show that low DOD float charging can reduce the loss of active lithium in the battery by increasing the number of float charging cycles,and ultimately prolong the service life of the battery pack.Based on the above analysis results,a feature quantity is proposed to characterize the degradation of battery capacity.The Pearson correlation coefficients between feature quantities and battery pack capacity are both greater than 0.98,which can accurately reflect the capacity degradation of the battery packs.