Decoupling internal safety parameters during Li-ion pouch cell operation by high-birefringent optical fiber sensors

This work presents the development and application of high-birefringent optical fiber sensors for the internal monitoring of Li-ion pouch cells during their operation. The instrumented optical fiber sensing configuration simultaneously discriminates and tracks temperature and strain shifts at different and consecutive cycling operation conditions which includes a Worldwide Harmonised Light Vehicle Test Procedure. A correlation of the strain data sensed by the optical fiber sensors with the Differential Voltage Analysis of the cell is performed. This study is integrated into the INSTABAT EU-project, and it demonstrates the potential of this advanced technology based on optical fiber in the field of Li-ion cell monitoring, making a substantial contribution to the development of more sustainable energy solutions by improving their safety issues and evaluating their performance in real-time.