In this work, we aim to develop a novel measurement methodology using serially connected resistor–capacitor (RC) parallel circuits by electrochemical impedance spectroscopy (EIS). The advantage of the proposed methodology is that temperature at multiple points can be determined in a single measurement with fewer connected cables and a flexible assembly compared with conventional approaches such as those using thermocouples or resistance temperature detectors (RTDs). In the proposed methodology, multiple RC parallel circuits are used, each of which connects an RTD to a capacitor in parallel. Four experiments are conducted, i.e., single, double, triple, and quadruple RC circuits, to verify the feasibility of the proposed methodology at temperatures of 290–360 K. With the proposed methodology, we can successfully determine multipoint temperature using the serially connected sensors in a single measurement. The accuracy of the proposed method estimated from conventional RTD measurement results is confirmed to be 0.7 K in the temperature range tested. The proposed method can be applied to profile the temperature of electrochemical devices that operate at relatively low temperatures, such as lithium-ion batteries.

在这项工作中，我们的目标是通过电化学阻抗谱 (EIS) 开发一种使用串联电阻 - 电容器 (RC) 并联电路的新型测量方法。与使用热电偶或电阻温度检测器 (RTD) 的传统方法相比，所提出方法的优势在于，可以通过更少的连接电缆和灵活的组件在单次测量中确定多个点的温度。在所提出的方法中，使用了多个 RC 并联电路，每个电路都将一个 RTD 并联连接到一个电容器。进行了四个实验，即单、双、三和四 RC 电路，以验证所提出的方法在 290-360 温度下的可行性 K. 使用所提出的方法，我们可以在单次测量中使用串联连接的传感器成功确定多点温度。根据常规 RTD 测量结果估计的建议方法的精度 在测试的温度范围内被证实为 0.7 K。所提出的方法可用于分析在相对较低温度下运行的电化学装置（例如锂离子电池）的温度。