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Accelerated Internal Resistance Measurements of Lithium-Ion Cells to Support Future End-of-Life Strategies for Electric Vehicles

机译:加速锂离子电池的内阻测量,以支持未来的电动汽车终生策略

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摘要

Industrial and academic communities have embarked on investigating the sustainability of vehicles that contain embedded electrochemical energy storage systems. Circular economy strategies for electric vehicle (EV) or hybrid electric vehicle (HEV) battery systems are underpinned by implicit assumptions about the state of health (SOH) of the battery. The internal resistance of battery systems is the essential property for determining available power, energy efficiency, and heat generation. Consequently, precise measurement is crucial to estimate the SOH; however, the international standards and best practice guides that exist to define the measurements include long preconditioning and rest times that make the test duration prohibitive. The aim of this research is to critically evaluate whether test duration times for internal resistance measurements can be reduced to values that may facilitate further end-of-life (EOL) options. Results reveal a newly developed technique using pulse-multisines is two to four times faster to perform when compared to the standard protocol whilst maintaining accuracy for battery electric vehicle (BEV) and HEV cells, respectively. This novel method allows different stakeholders to rank the relative importance of test accuracy verses experimental test time when categorising used Li-ion cells for different EOL applications.
机译:工业和学术界已经开始调查含有嵌入式电化学能量存储系统的车辆的可持续性。电动车辆(EV)或混合动力电动车(HEV)电池系统的循环经济策略通过关于电池的健康状态(SOH)的隐含假设而受到基础。电池系统的内部电阻是确定可用功率,能量效率和发热的基本性质。因此,精确的测量至关重要,估计SOH;然而,存在用于定义测量的国际标准和最佳实践指南包括使测试持续时间过度的长的预处理和休息时间。该研究的目的是批判性地评估内部电阻测量的测试持续时间是否可以减少到可促进寿命进一步的寿命(EOL)选项的值。结果显示,与标准协议相比,使用脉冲 - 多相区的新开发的技术速度速度快两到四倍,同时分别保持电池电动车(BEV)和HEV电池的精度。这种新方法允许不同的利益相关者在对不同EOL应用进行分类的锂离子电池进行分类时对测试精度进行实验测试时间的相对重要性。

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