Life prediction and maintenance method of a fuel cell system
A fuel cell system and life prediction technology, which is applied to fuel cells, circuits, electrical components, etc., can solve problems such as inconsistencies in the nonlinear inflection point of the stack, and achieve improved identification and fitting, improved accuracy, and high prediction accuracy Effect
Active Publication Date: 2021-06-25
BEIJING SINOHYTEC
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[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a life prediction and maintenance method of a fuel cell system, which solves the problems of nonlinear inflection point and inconsistency in the process of stack life attenuation prediction
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[0030] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.
[0031] Such as figure 1 As shown, the present invention provides a method for life prediction of a fuel cell system, and each step is described below:
[0032] S1: Obtain the average single-chip voltage and the lowest single-chip voltage of the fuel cell system at different time points by current interval. Under different current ranges, the fuel cell will show different attenuation characteristics, and the battery life wi...
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The invention provides a life prediction method of a fuel cell system, comprising the following steps: obtaining the average single-chip voltage and the lowest single-chip voltage of the fuel cell system at different time points by dividing the current interval; calculating the average single-chip voltage at different time points by dividing the current interval voltage and the voltage deviation value of the lowest monolithic voltage; determine whether the voltage deviation value is in the linear region or the non-linear region; according to the region where the voltage deviation value is located, the formula for the change of the lowest monolithic voltage with time is obtained by dividing the current interval, and the minimum The time when the monolithic voltage drops to a preset threshold is used as the expected end-of-life time; based on the expected end-of-life time under each current range, the expected life is obtained. Based on the above life prediction method, the present invention also provides a fuel cell system maintenance method, which replaces part of the fuel cell single piece after reaching the end of life time. The method of the invention effectively solves the problems of non-linear inflection point and inconsistency in the prediction process of stack life decay.
Description
technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for life prediction and maintenance of a fuel cell system. Background technique [0002] The working principle of the proton exchange membrane fuel cell is that hydrogen and oxygen undergo an electrochemical reaction to generate water and output electricity at the same time. Since the voltage of a single fuel cell is usually less than 1V, in practical applications, it is necessary to connect hundreds of single cells in series to form a fuel cell stack, and match the corresponding peripheral accessories to form a fuel cell system. [0003] Life is one of the core indicators of fuel cell systems. During the operation of the fuel cell system, the attenuation problems caused by factors such as membrane leakage, carbon corrosion, and active area decline basically show the characteristics of linearity first and then acceleration. At the same time, since the stack is usual...
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IPC IPC(8): H01M8/04537H01M8/04664H01M8/04992
CPCH01M8/04552H01M8/04671H01M8/04992Y02E60/50
Inventor 赵兴旺周鹏飞
Owner BEIJING SINOHYTEC