Abstract: Strengthening the research and development of power battery safety management technology has become an important topic in the development of the new energy vehicle industry. This article adopts the temperature measurement principle based on optical time-domain reflectometer (OTDR) technology to conduct distributed collection of individual batteries in battery packs. Comparing the single channel demodulation method with the dual channel demodulation method, it is found that the dual channel demodulation method is more suitable for demodulating the temperature of power batteries. A temperature acquisition system consisting of wavelength division multiplexing module, amplifier module, analog-to-digital conversion module, temperature display and alarm system is built to collect weak Stokes and anti Stokes light. The circuit diagram of the temperature measurement system is built in Proteus8.9 software and simulated for testing.The temperature display and abnormal alarm functions of the system are verified using a rheostat simulation signal source.

Key words: New energy vehicle; OTDR; Temperature collection; Temperature measuring optical fiber

摘要： 加强动力电池安全管理技术研发已成为新能源汽车产业发展过程中的一个重要课题， 文章采用基于光时域反射仪（OTDR）技术的测温原理对电池组单体电池进行分布式采集。对 比单路解调法和双路解调法，得到采用双通道的双路解调法更适合动力电池温度的解调。搭 建由波分复用模块、放大器模块、模数转换模块、温度显示及报警系统等组成的温度采集系 统，对微弱的斯托克斯及反斯托克斯光进行采集，在 Proteus8.9 软件中搭建了测温系统的电 路图并进行仿真测试，使用变阻器模拟信号源验证了系统温度显示和异常报警的功能。

关键词: 新能源汽车；OTDR；温度采集；测温光纤