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Phase Change Material Based Thermal Management for Li-Ion Batteries
Keywords: thermal management , phase change materials , handheld devices
Lithium ion batteries are used a wide range of handheld devices including smart phones, tablets, notebook computers, cameras, camcorders, and medical equipment, etc. As ever-increasing demand for speed and functionalities of these devices, the batteries need to fast acquire and hold more power. As a result, fast charging is becoming a more and more important issue for the handheld devices. Fast charging typically requires high charging current, which inevitably causes more heat and thus might drastically increase battery temperature. However, charging temperature limits for Li-ion are stricter than the operating temperature limits. High temperatures (above 45 C) during charging process may lead to battery degradation or even premature failure. Therefore, controlling and regulating battery temperature during charging and operation is critical for the today’s handheld devices. This paper will introduce a novel thermal management concept based on phase change materials for fast charging capable handheld devices. A numerical case study and an experimental test will also be presented to demonstrate performance advantages of using a PCM based thermal solution to handle excessive heat during fast charging processes.
Yuan Zhao, Principal Engineer
Henkel Electronics Materials
irvine, ca

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