【摘要】 燃料电池作为新能源,具有清洁环保、高效节能等优点,对于新能源技术的发展有着重要意义。电化学阻抗谱(EIS)是燃料电池的重要性能指标,对其进行精确检测是燃料电池系统高效、可靠运行的重要保障。传统的检测方法需要在外部施加1个激励信号源,增加了测试系统自身的体积和成本,难以实现在线测试。针对此问题,这里提出一种基于DC/DC的内阻在线检测方法,在DC/DC电路中对参考电压信号施加不同频率的三角波扰动信号,调制电路纹波,作为激励源,引入燃料电池中,对燃料电池的输出电压、电流分别进行快速傅里叶变换(FFT),分析不同频率下燃料电池的阻抗值,最后通过使用非线性拟合的方法拟合了测量阻抗值,得到相应的EIS。实验结果表明提出的EIS检测方法实时性好、精度高,在一定程度上减小了测试系统的体积。更多还原

【Abstract】 As a new energy, fuel cell has the advantages of clean environment and high efficiency.It is of great significance for the development of new energy technology.Electrochemical impedance spectra(EIS) is an important performance indicator for fuel cell, and an accurate examination of it is an important assurance that fuel cells are efficient and reliable.The traditional method of testing requires an external incentive source, increasing the size and cost of the test system itself, which is difficult to implement online testing.To solve this problem, an internal resistance online detection method is proposed based on DC/DC, which can apply different frequency of triangular wave signal disturbance to the reference signal voltage in DC/DC circuit,and the modulation fuel cell output ripple,fast Fourier transform(FFT) is applied to the output voltage and current of the fuel cell,the impedance value of fuel cell is analyzed at different frequencies, and finally by using the non-linear fitting method fitting the measured impedance results, get the corresponding EIS.The experimental results show that the proposed EIS test method of good real-time, high precision, to a certain extent, reduce the volume of the test system.更多还原