The effects of high frequency current ripple on electric vehicle battery performance
The effects of high frequency current ripple on electric vehicle battery performance
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DOI：
10.1016/j.apenergy.2016.06.033
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发表时间：
2016-09-15
期刊：
影响因子：
11.2
通讯作者：
Marco, James
中科院分区：
文献类型：
--
作者：
Uddin, Kotub;Moore, Andrew D.;Marco, James
电动汽车（EV）动力系统中的电力电子子系统需要管理车辆内的能量流和电机的扭矩传递。已知这样的系统在高压总线上产生不期望的电噪声。高频电流振荡或涟漪，如果不受阻碍，将进入车辆的电池系统。对串联混合动力电动汽车（HEV）高压母线上的电流的实际测量表明，存在从10 Hz到超过10 kHz的显著电流扰动。在学术文献中，很少有关于电池系统性能的潜在影响以及与电池暴露于耦合直流（DC）和交流（AC）相关的退化率的报道。本文记录了一项实验研究，研究了电流涟漪对电池性能退化的长期影响。初步结果强调，容量衰减和阻抗上升逐渐增加的叠加交流电流的频率增加。进一步的结论是，与传统的DC波形相比，使用耦合的AC-DC信号循环的电池的劣化的扩展显著更多。这种退化的潜在因果关系尚不清楚。然而，这对电池管理系统（BMS）具有重要意义。电池容量和阻抗的增加的变化将导致电池组内的差分电流和发热，如果不适当地管理，将进一步缩短电池寿命并降低车辆的操作。(C)2016作者爱思唯尔有限公司出版
The power electronic subsystems within electric vehicle (EV) powertrains are required to manage both the energy flows within the vehicle and the delivery of torque by the electrical machine. Such systems are known to generate undesired electrical noise on the high voltage bus. High frequency current oscillations, or ripple, if unhindered will enter the vehicle's battery system. Real-world measurements of the current on the high voltage bus of a series hybrid electric vehicle (HEV) show that significant current perturbations ranging from 10 Hz to in excess of 10 kHz are present. Little is reported within the academic literature about the potential impact on battery system performance and the rate of degradation associated with exposing the battery to coupled direct current (DC) and alternating currents (AC). This paper documents an experimental investigation that studies the long-term impact of current ripple on battery performance degradation. Initial results highlight that both capacity fade and impedance rise progressively increase as the frequency of the superimposed AC current increases. A further conclusion is that the spread of degradation for cells cycled with a coupled AC-DC signal is considerably more than for cells exercised with a traditional DC waveform. The underlying causality for this degradation is not yet understood. However, this has important implications for the battery management system (BMS). Increased variations in cell capacity and impedance will cause differential current flows and heat generation within the battery pack that if not properly managed will further reduce battery life and degrade the operation of the vehicle. (C) 2016 The Authors. Published by Elsevier Ltd.