Method for predicting remaining service life of fuel cell by doing statistics on load power change
A fuel cell and load power technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of difficulty in the accuracy of fuel cell life prediction, difficulty in accurately simulating fuel cells, etc., and achieve creative and novel effects.
Inactive Publication Date: 2018-01-26
BEIJING UNIV OF TECH
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However, these methods, on the one hand, introduce a relatively complicated process of laboratory testing, and on the other hand, it is difficult to accurately simulate the actual working conditions of fuel cells, and usually only linear fitting can be performed. sexual difficulties
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[0018] Firstly, draw out the variation amplitude P of different discharge currents i and service life N i The relationship curve, get the functional relationship between the two:
[0019] N i =N(P i )
[0020] Here, define P in the i-th power change event i The life loss of the fuel cell under the influence is LoL i , at P i Under the influence, n(P i ) represents the actual service life of the fuel cell counted by the rainflow counting method, N(P i ) represents the maximum number of discharges corresponding to the failure of the fuel cell. Calculated as follows:
[0021]
[0022] Then, for the selected fuel cell, during the operation of the fuel cell, the output voltage and output current of the fuel cell are collected through the voltage sensor and the current sensor to obtain the current output power of the fuel cell, and then the collected power data Perform filtering, read the filtered data into the real-time rainflow counting system, and use the real-time r...
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The invention discloses a method for predicting the remaining service life of a fuel cell by doing statistics on load power change. The method proceeds from the influence of the amplitude of load power change and the number of the times of the load power change on a fuel cell. According to the method of the invention, experimental testing is performed on the influence of the amplitude of the loadpower change and the number of the times of the load power change on the fuel cell; and relations between influence factors and the service life of the fuel cell are sought out on the basis of the testing; by means of a real-time rain flow counting method, sensors are adopted to continually do statistics on the amplitude of the power change of the fuel cell and the number of the times of the powerchange of the fuel cell during the operation process of the fuel cell; statistical data are analyzed in real time; the statistical data are combined with previous experimental results; and therefore,the prediction of the remaining service life of the fuel cell can be realized. The method is simple and can be conveniently used for the prediction of the remaining life of the fuel cell.
Description
technical field [0001] The invention relates to a method for predicting the remaining life of a fuel cell, in particular to a method for predicting the remaining life of a fuel cell by counting changes in load power, and belongs to the technical field of fuel cells. Background technique [0002] With the aggravation of environmental pollution and energy crisis, traditional internal combustion engine vehicles have exposed more and more disadvantages. New energy vehicles, such as pure electric vehicles and hydrogen fuel cell electric vehicles, have become research hotspots in major countries. Among them, compared with pure electric vehicles, hydrogen fuel cell electric vehicles have the advantages of high energy conversion efficiency, complete zero emission, and strong overload capacity, so they have become another popular choice in the automotive field after pure electric vehicles. [0003] As a new type of energy system, a hydrogen fuel cell is an energy device that can con...
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IPC IPC(8): G01R31/36
Inventor 宾洋徐鸿飞刘世奇高金雨张苏绪
Owner BEIJING UNIV OF TECH