植入式锂离子电池光纤布拉格光栅温度传感器

Implantable Fiber Bragg Grating Temperature Sensor Inside Lithium-Ion Battery

锂离子电池运行期间尤其在高放电倍率下产生的热量会导致温度大幅上升,仅仅依赖于单体电池表面的温度监测不能为电池管理系统提供最准确、最可靠的传感数据。对锂离子电池原位监测是防止锂离子电池热失控的最有效的方法之一,将传感器置于锂离子电池的热源核心处,可第一时间感知温度变化。在18650圆柱体锂离子电池内部中心处埋入光纤复合温度传感器,利用同一根光纤上的法布里-珀罗空气腔消除布拉格光栅传感机理固有的温度与应力交叉敏感,实验结果表明,在电池充放电阶段可以实时监测电池内部温度变化,光纤传感器与电池内部电芯相容性较好,可以满足大尺度锂离子电池集成组件的健康状态长期监测。

In the operation of lithium-ion batteries,particularly at the high discharge rate,the temperature of the battery significantly increases owing to heat generation.The most accurate and reliable sensor data for the battery management system(BMS)cannot be obtained by relying solely on temperature monitoring of the surface of individual cells.In-situ monitoring of lithium-ion batteries is one of the most effective methods to prevent the thermal runaway of lithium-ion batteries.A sensor is implanted in the heat source core of the lithium-ion battery,and the temperature change can be sensed immediately.A fiber optic composite temperature sensor is embedded in the inner center of the 18650 cylindrical lithium-ion battery,and the cross sensitivity of temperature and stress inherent in the Bragg grating sensing mechanism is eliminated using the Fabry-Perot(F-P)air cavity on the same fiber.The experimental results show that the internal temperature change of the battery can be monitored in real time in the charge and discharge stages,and the optical fiber sensor is compatible with the internal cell of the battery.This can facilitate the long-term health monitoring of large-scale lithium-ion battery-integrated components.