Abstract
Lithium batteries are widely used in notebook computers, mobile phones, 3C electronic products, and electric vehicles. However, under a high charge/discharge rate, the internal temperature of lithium battery may rise sharply, thus causing safety problems. On the other hand, when the lithium battery is overcharged, the voltage and current may be affected, resulting in battery instability. This study applies the micro-electro-mechanical systems (MEMS) technology on a flexible substrate, and develops a flexible three-in-one microsensor that can withstand the internal harsh environment of a lithium battery and instantly measure the internal temperature, voltage and current of the battery. Then, the internal information can be fed back to the outside in advance for the purpose of safety management without damaging the lithium battery structure. The proposed flexible three-in-one microsensor should prove helpful for the improvement of lithium battery design or material development in the future.
Highlights
Many countries are devoted to alleviating global warming and finding coping strategies, especially with the development of green energy
The micro-electro-mechanical systems (MEMS) technology is used in this study to develop a flexible three-in-one microsensor which can be embedded in a lithium battery for real-time monitoring of the internal temperature, voltage and current
The temperature microsensor used in this study was a resistance temperature detector (RTD)
Summary
Many countries are devoted to alleviating global warming and finding coping strategies, especially with the development of green energy. Lithium batteries are characterized by portability, high energy density, high operating voltage, wide service temperature range, no memory effect and long life They are indispensable energy storage devices at present. The endogenous events of lithium batteries can be observed by real-time monitoring of the internal temperature, voltage and current of the battery, as well as by analyzing the electrochemical reactions occurring inside the battery and possible failure causes. The micro-electro-mechanical systems (MEMS) technology is used in this study to develop a flexible three-in-one microsensor which can be embedded in a lithium battery for real-time monitoring of the internal temperature, voltage and current. The internal temperature uniformity and voltage and current variation are analyzed microscopically, completing the measuring tool for internal real-time microscopic monitoring and safety diagnosis of lithium batteries
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