基于电驱逆变器重构的车用动力锂电池自加热策略
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上海交通大学机械与动力工程学院

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基金项目:

国家自然科学基金青年项目(52007119);上海市浦江人才计划(20PJ1407200)


Self-Heating Strategy for Automotive Lithium-ion Batteries Based on Traction Drive Reconfiguration
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Affiliation:

School of Mechanical Engineering,Shanghai Jiao Tong University,China

Fund Project:

Project Supported by National Natural Science Foundation of China (Grant No. 51677118); Shanghai Pujiang Program (2017YFE0102000)

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    摘要:

    为解决车用锂离子动力电池低温性能衰退问题,本文提出了一种基于电动汽车电驱逆变器重构的自加热方法,利用驱动电机绕组作为储能元件,无需额外设备即可对电池进行低温交流加热。首先,建立了交流加热拓扑的详细数学描述,得到电池电压、电流与加热控制参数间的解析关系。随后设计自适应模糊PI控制器对加热过程中的电池电压和电流进行动态调节,保证加热速率的同时可有效防止电池老化。此外,针对电池加热过程中电机易产生噪声和振动的问题,提出了基于转子位置箝位的转矩脉动抑制方案,有效保障乘员舒适性和电机耐久性。实验结果表明,所提出的自加热策略在403秒内即可将电池从-20℃加热到0℃以上,且不会对电池寿命造成永久性损伤。

    Abstract:

    In order to solve the performance degradation of automotive lithium-ion battery at low temperature, this paper developed a self-heating method based on traction drive reconfiguration of electric vehicles. In the proposed method, the stator windings were utilized as the energy storage units, so that additional hardware could be eliminated. The detailed mathematical description of AC heating topology was established and the analytical relationship between battery voltage at first, where current and heating control parameters was obtained. Then, an adaptive fuzzy PI controller was implemented on the reconfigured inverter to regulate both the heating current and the charge/discharge voltages of the batteries dynamically. With the proposed control strategy, the heat generation rate could always be guaranteed without triggering severe lithium plating. In addition, in order to relieve mechanical vibration and noise of traction motors, this paper also proposed a torque-cancel scheme during internal heating, ensuring passenger comfort and durability of motors. The results demonstrate effectiveness and superiority of the proposed strategy. The tested batteries are warmed up from -20 °C to above 0 °C within 403 s without permanently damaging the battery life.

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  • 收稿日期:2021-11-01
  • 最后修改日期:2021-12-27
  • 录用日期:2022-01-18
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