电化学阻抗谱因具有无损伤、频带宽、精度高、可车载应用等优点，近年来在质子交换膜燃料电池的研究上得到广泛应用，但是对于大功率电堆的阻抗谱测量和定量解析仍存在不足。针对大功率燃料电池电堆，在标准的运行条件下进行阻抗谱测量，通过快速傅里叶变换和总谐波失真分析发现，直流-直流变换器在高频处会引入谐波干扰。采用基于特征频率分辨率优化的弛豫时间分布方法，优化特征频率分辨率和正则化参数，实现了大功率电堆动力学极化过程的定量识别，包括催化剂层质子传输、阳极极化、电荷转移和氧气传质过程。该方法为大功率电堆的动力学极化过程定量识别提供技术支持。

Electrochemical impedance spectroscopy (EIS) offers advantages such as non-destructiveness, wide frequency range, high precision, and applicability in vehicle-mounted systems, making it increasingly popular in the study of proton exchange membrane fuel cells (PEMFCs). However, there is a notable lack of research on impedance measurement and quantitative analysis for high-power fuel cell stacks. This study focuses on high-power fuel cell stacks, conducting EIS measurements under standard operating conditions. The impedance spectra were analyzed using Fast Fourier Transform (FFT) and Total Harmonic Distortion (THD). The results indicate that the DC-DC converter generates harmonic interference at high frequencies. The relaxation time distribution method based on the optimization of characteristic frequency resolution was adopted to optimize the characteristic frequency resolution and regularization parameters, achieving the quantitative identification of the dynamic polarization processes of high - power fuel cell stacks, including the proton transport in the catalyst layer, anode polarization, charge transfer, and oxygen mass transfer processes. This method provides technical support for the quantitative identification of the kinetic polarization processes in high-power fuel cell stacks.