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http://dx.doi.org/10.4313/JKEM.2018.31.6.427

Design of Low-Melting Metal Fuse Elements of Current Sensing Type Protection Device for Large Capacity Secondary Battery Protection System  

Kim, Eun Min (Seoul National University Electric Power Research Institute (SEPRI))
Kang, Chang yong (Department of Metallurgical Engineering, Pukyong National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.31, no.6, 2018 , pp. 427-432 More about this Journal
Abstract
High-capacity secondary batteries can cause explosion hazards owing to microcurrent variations or current surges that occur in short circuits. Consequently, complete safety cannot be achieved with general protection that is limited to a mere current fuse. Hence, in the case of secondary batteries, it is necessary for the protector to limit the inrush current in a short circuit, and to detect the current during microcurrent variations. To serve this purpose, a fuse can be employed for the secondary battery protection circuit with current detection. This study aims at designing a protection device that can stably operate in the hazardous circumstances associated with high-capacity secondary batteries. To achieve the said objective, a detecting fuse was designed from an alloy of low melting point elements for securing stability in abnormal current states. Experimental results show that the operating I-T and V-T characteristic constraints can be satisfied by employing the proposed current detecting self-contained low melting point fuse, and through the resistance of the heating resistor. These results thus verify that the proposed protection device can prevent the hazards of short circuit current surges and microcurrent variations of secondary batteries.
Keywords
Current sensing fuse; Low melting point alloy; I-T curve; Secondary battery; V-T curve;
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