Li-ion batteries (LIBs) are the optimal carrier of the renewable energy, while remarkable self-heating can cause performance degradation, even thermal runaway and explosion in the LIBs. Thus, it is important to monitor internal temperature for improving the safety of LIBs. Currently, the inserted temperature sensors induce the electrode damage and capacity degradation of battery, which is not suitable for practical applications. By integrating the multi-point thin film sensor into the LIB electrodes, a novel method is proposed to assemble an integrated battery that remains a stable capacity with high Coulombic efficiency in 100 cycles. The long-term cyclic experimental results show that the inserted thin film sensor has limited impact on the performance of the integrated LIBs. The thin film sensor with electrochemically inert feature demonstrates the internal temperature variation in real-time under different current rates. Consequently, the proposed novel method is used for analyzing failure mechanism and improving safety of Li-ion batteries.

锂离子电池（LIB）是可再生能源的最佳载体，而出色的自发热会导致性能下降，甚至导致LIB的热失控和爆炸。因此，监视内部温度对于提高LIB的安全性很重要。目前，插入的温度传感器会引起电极损坏和电池容量下降，这不适合实际应用。通过将多点薄膜传感器集成到LIB电极中，提出了一种新颖的方法来组装集成电池，该集成电池在100个循环中保持高库仑效率的稳定容量。长期循环实验结果表明，插入的薄膜传感器对集成LIB的性能影响有限。具有电化学惰性功能的薄膜传感器可实时显示不同电流速率下的内部温度变化。因此，提出的新方法被用于分析失效机理并提高锂离子电池的安全性。