In-situ Monitoring of Temperature and Voltage in Lithium-Ion Battery by Embedded Flexible Micro Temperature and Voltage Sensor

Lithium-ion batteries are utilized in mobile phones, personal digital assistants (PDA), 3C products and electric vehicles. Batteries must be rapidly chargeable. They discharge in devices. In both processes, the temperature in the battery increases rapidly. Safety is very important in the operation of lithium-ion batteries. In this work, a flexible micro temperature and voltage sensor is fabricated by the micro-electro-mechanical systems (MEMS) process for integration on flexible film substrates. The electrolyte and heat inside the lithium batteries can influence the accuracy of measurements made by, and the lifetimes of, flexible micro temperature sensors. In this work, flexible micro temperature and voltage sensor is embedded into lithium-ion battery to acquire in situ temperature and voltage data. These data are useful for improving the safety of lithium-ion batteries.