正弦脉动电流充放电下的锂离子电池发热特性  

Thermal characteristics of lithium-ion battery with sinusoidal charge and discharge pulsating current

作　　者：贾增昂 凌志斌[1] 李旭光[1] JIA Zeng'ang;LING Zhibin;LI Xuguang(Key Laboratory of Control of PowerTransmission and Conversion,Shanghai JiaoTong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电力传输与功率变换控制教育部重点实验室,上海200240

出　　处：《储能科学与技术》2021年第6期2260-2268,共9页Energy Storage Science and Technology

基　　金：国家自然科学基金面上项目(51777125)。

摘　　要：在级联H桥储能系统和模块化多电平储能系统中,电池的实际充放电电流为正弦交流和恒定直流的叠加,形成正弦脉动电流。本研究利用一维电化学模型,通过正弦脉动电流和恒定直流充放电下的电池发热特性的对比,对正弦脉动充放电电流下的LiFePO4电池的发热特性进行研究。研究结果表明正弦脉动电流下的电池瞬态热功率和瞬态内阻均随电流发生周期性波动;当正弦交流成分的波动幅值为直流成分的25%时,相对于纯直流充放电,放电和充电过程仅分别造成5%和2.8%的额外发热,但当正弦交流成分的波动幅值进一步增大,电池发热则会急剧增加;从SOC中间值到两端,电池压降和电流的相位差逐渐增大,即电池容性作用呈增大趋势;随着电流脉动频率增大,电池发热呈减小趋势。The actual charging and discharging current of the battery in the cascaded H-bridge energy storage system and MMC energy storage system is the superposition of sinusoidal alternating current(AC)and constant direct current(DC),forming a sinusoidal pulsating current.The fluctuation of battery charging and discharging current has a great influence on the thermal characteristics of the battery,which determines the thermal management measures and battery service life.Based on this condition,the thermal characteristics of a LiFePO4 battery under sinusoidal pulsating charge and discharge current were investigated in this study using a one-dimensional electrochemical model and compared to those under constant DC.The results show that the transient thermal power and internal resistance of the battery fluctuate periodically with the current;When the fluctuation amplitude of the sinusoidal AC component is 25%that of the DC component,the discharge and charge processes cause only 5%and 2.8%extra heating,respectively,when compared to the pure DC charge and discharge.However,as the fluctuation amplitude of the sinusoidal AC component increases further,the battery heating increases sharply;from the middle to both ends of SOC,the phase difference between voltage drop and current increases,indicating an increase in the capacitive effect;as the frequency of current pulsation increases,the heating of the battery decreases.

关 键 词：电池储能 锂离子电池 热特性 正弦脉动电流 

分 类 号：TM461[电气工程—电器] TM464