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Internal short circuit detection method for battery pack based on circuit topology

查看全文 作　　者：ZHANG [1,2]MingXuan;DU [1]JiuYu;LIU [1]LiShuo;SIEGEL [2]Jason;LU [1]LanGuang;HE [3]XiangMing;OUYANG [1]MingGao 高影响力作者 机构地区：[1]State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;[2]College of Engineering, University of Michigan, Ann Arbor, MI 48109, USA;[3]Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China高影响力机构 出　　处：《Science China(Technological Sciences)》索引2018年第61卷第10期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Grant No. U1564205);the Ministry of Science and Technology of China (Grant No. 2016YFE0102200);funded by China Scholarship Council 摘　　要：Internal short circuit(ISCr) is one of the major obstacles to the improvement of the battery safety. The ISCr may lead to the battery thermal runaway and is hard to be detected in the early stage. In this work, a new ISCr detection method based on the symmetrical loop circuit topology(SLCT) is introduced. The SLCT ensures that every battery has the same priority in the circuit and every battery will contribute the same amount of short-circuit current to the ISCr once the ISCr happens. The ISCr battery could be identified by the combination of the ratio of the short-circuit currents and the sign of the short-circuit currents. The recursive least square method is adopted for the real-time application and the optimized ammeters allocation is derived from the mathematic deduction. The battery pack based on the individual DP(dual polarization) battery model is established to verify the ISCr detection method. The 1–1000 Ω s ISCr(the early stage ISCr) can be effectively detected within 1–125 s. The SLCT provides the possibility of new battery pack designs and new battery management methods. The proposed ISCr detection method shows excellent effectiveness and efficiency on the identification of the ISCr battery in the early stage. 关 键 词：电池模型 内部短路 拓扑学 电路 包装 电流计 数学推理 电池管理
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