A fuel cell system insulation design method and an insulation fault diagnosis method

Abstract

The present application relates to the technical field of new energy, in particular to a fuel cell system insulation design and insulation fault diagnosis method, the insulation design method provides an insulation design basis in the development and design stage of the fuel cell system; and the insulation fault diagnosis method provides an insulation fault troubleshooting scheme of the fuel cell system, quickly locates the insulation fault reason of the fuel cell system, and the main purpose is to solve the insulation problem of the fuel cell system and improve the insulation performance of the fuel cell; by building an insulation model of the fuel cell system, the influence of each subcomponent and pipeline in the fuel cell system on the insulation performance of the system is analyzed, corresponding solutions are formulated for the key influencing factors through the influence analysis, so as to meet the insulation design requirements of the fuel cell system and analyze and locate the insulation fault of the system.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, specifically to an insulation design for a fuel cell system and a method for diagnosing insulation faults. Background Technology

[0002] In the field of fuel cells, the insulation value of a product is mainly estimated during the product design phase by assessing the insulation performance of its components, and the insulation performance is evaluated based on the test values ​​of the prototype. Currently, the main solution for troubleshooting insulation problems is for personnel to go to the site and use handheld insulation meters to perform segmented insulation tests on components to ultimately identify the problem point. The drawback is that the operating space after the fuel cell is installed in the vehicle is limited, making on-site operation inconvenient, and some locations are inaccessible, hindering troubleshooting. In the field of power batteries, there are similar insulation equivalent circuit model solutions, which require the values ​​of one or more actual test points. The insulation value of the system is then simulated using the equivalent circuit model based on the values ​​of these test points. This patented solution does not require insulation values ​​from actual test points; the fundamental methods and principles are different.

[0003] Existing technologies lack theoretical basis for insulation design, and the evaluation of product insulation performance lags behind during the product design stage of fuel cells; during the troubleshooting stage, on-site operation is required, and sometimes on-site operation is not possible, resulting in complex and inefficient troubleshooting solutions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fuel cell system insulation design and insulation fault diagnosis method that can provide a design basis for the insulation design of fuel cells and can quickly locate the cause of insulation faults when insulation faults occur.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An insulation design method for a fuel cell system, including

[0007] Develop insulation design specifications for fuel cell systems;

[0008] Build an insulation model based on the fuel cell system piping connection diagram;

[0009] Insulation parameters of the fuel cell system, insulation requirements of each component and pipeline are obtained through insulation model simulation.

[0010] Determine whether the insulation requirements of each component and pipeline meet the established insulation design specifications for the fuel cell system. If they do, proceed with product development based on the simulation results; otherwise, re-optimize the parameters and re-simulate.

[0011] Furthermore, insulation parameters of the fuel cell system, insulation requirements of various components and pipelines are obtained through insulation model simulation, including...

[0012] Insulation tests are used to obtain data on the insulation performance of each component and pipeline.

[0013] The overall insulation value R0 of the fuel cell system is obtained by constructing an equivalent resistance model of the fuel cell system through the pipeline connection relationship.

[0014] Furthermore, the insulation tests of each component are performed multiple times under the same conductivity conditions of the filling liquid, and the average value is taken.

[0015] Furthermore, by taking a fixed length of the pipeline used in actual product applications, filling it with a filling liquid, and testing the insulation value at both ends of the pipeline, the insulation performance data of the pipeline is obtained. The specifications of each section of the pipeline in actual application are measured, and the conductivity value of each related section of the pipeline is obtained through the insulation resistance calculation formula.

[0016] Furthermore, the fixed length is 1m.

[0017] Furthermore, the filling solution is deionized water with a concentration of 5 μS / cm.

[0018] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows:

[0019] A method for diagnosing insulation faults in a fuel cell system, including

[0020] Test the insulation value of the fuel cell system under insulation fault conditions;

[0021] Build an insulation model based on the fuel cell system piping connection diagram;

[0022] The insulation values ​​of the fuel cell system under insulation fault conditions are input into the insulation model for simulation reproduction.

[0023] Furthermore, it is determined whether the overall insulation value of the fuel cell system obtained from the insulation model is consistent with the insulation value under the test fuel cell system insulation fault state. If so, the insulation problem node is identified, the successful reproduction is confirmed, and rectification is carried out; otherwise, the parameters are re-optimized and the simulation is repeated.

[0024] Furthermore, the insulation model includes

[0025] Set the insulation performance data of each component and pipeline to the data under fault-free conditions / production conditions;

[0026] The overall insulation value R0 of the fuel cell system is obtained by constructing an equivalent resistance model of the fuel cell system through the pipeline connection relationship.

[0027] Furthermore, the insulation value under the test of the fuel cell system's insulation fault state is input into the insulation model for simulation, and the problem is reproduced by changing a certain insulation value.

[0028] The beneficial effects of this invention are as follows: The main function of this application is to provide an insulation design basis and a troubleshooting scheme for insulation faults in fuel cell systems during the development and design phase of fuel cell systems, and to quickly locate the causes of insulation faults in fuel cell systems. The main purpose is to solve the insulation problems of fuel cell systems and improve the insulation performance of fuel cells. By building an insulation model of the fuel cell system, the influence of each sub-component and pipeline inside the fuel cell system on the system insulation performance is analyzed. Through influence analysis, corresponding solutions are formulated for key influencing factors to meet the insulation design requirements of the fuel cell system and to analyze and locate system insulation faults. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an insulation model for a specific embodiment of the present invention (where X and Y are modifiable / adjustable parameter groups);

[0030] Figure 2 This is a schematic diagram of the equivalent resistance model for a specific embodiment of the present invention;

[0031] Figure 3 This is a flowchart illustrating an insulation design method for a fuel cell system according to a specific embodiment of the present invention.

[0032] Figure 4 This is a flowchart illustrating a method for diagnosing insulation faults in a fuel cell system according to a specific embodiment of the present invention. Detailed Implementation

[0033] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0034] Example 1

[0035] An insulation design method for a fuel cell system, including

[0036] Develop insulation design specifications for fuel cell systems;

[0037] Build an insulation model based on the fuel cell system piping connection diagram;

[0038] Insulation tests are used to obtain data on the insulation performance of each component and pipeline.

[0039] The overall insulation value R0 of the fuel cell system is obtained by constructing an equivalent resistance model of the fuel cell system through the pipeline connection relationship.

[0040] Determine whether the insulation requirements of each component and pipeline meet the established insulation design specifications for the fuel cell system. If they do, proceed with product development based on the simulation results; otherwise, re-optimize the parameters and re-simulate.

[0041] in

[0042] The insulation tests of each component were conducted multiple times under the same conductivity conditions of the filling liquid (5 uS / cm deionized water), and the average value was taken.

[0043] By taking a 1m section of the pipeline used in actual product applications, filling it with a filling fluid (5uS / cm deionized water), and testing the insulation values ​​at both ends of the pipeline, the insulation performance data of the pipeline can be obtained. The specifications of each section of the pipeline in actual applications are measured, and the conductivity values ​​of each related section of the pipeline are obtained through the insulation resistance calculation formula.

[0044] Explanation of the principle:

[0045] During the product design phase, a system equivalent resistance model is built (refer to...). Figure 4 ), the insulation value of the simulation system;

[0046] First, it is necessary to test and obtain the insulation performance data of each component. Under the specified uniform conductivity of the filling liquid (5uS / cm deionized water), insulation tests are performed on the components, and the average value of multiple sets of data is taken to provide accurate insulation values ​​of the components.

[0047] Then, using a 1-meter section of the actual pipeline used in the product application, fill the inside with 5uS / cm deionized water, and test the insulation value at both ends of the pipeline to obtain the insulation performance data of the pipeline.

[0048] Finally, the specifications of each section of the pipeline in actual application are measured, and the conductivity value of each section of the pipeline is obtained through the insulation resistance calculation formula. Based on the actual connection relationship of the system PID, the equivalent resistance model is drawn. Under the conditions that the conductivity value of deionized water is constant, the insulation value of components is fixed, and the pipeline specifications are constant, the system insulation value R0 can be obtained.

[0049] When any of these parameters changes, the system insulation value R0 will also change. For example, changes in the conductivity of deionized water, changes in the insulation value of components, and changes in pipeline specifications will all cause the system insulation value R0 to change accordingly.

[0050] Example 2

[0051] A method for diagnosing insulation faults in a fuel cell system, including

[0052] Test the insulation value of the fuel cell system under insulation fault conditions;

[0053] Build an insulation model based on the fuel cell system piping connection diagram;

[0054] The insulation values ​​of the fuel cell system under insulation fault conditions are input into the insulation model for simulation, and the simulation is reproduced by changing one or more insulation values.

[0055] Determine whether the overall insulation value of the fuel cell system obtained from the insulation model is consistent with the insulation value under the test fuel cell system insulation fault state. If so, identify the insulation problem node, confirm successful reproduction, and rectify it; otherwise, re-optimize the parameters and re-simulate.

[0056] in

[0057] The insulation model includes

[0058] Set the insulation performance data of each component and pipeline to the data under fault-free conditions / production conditions;

[0059] The overall insulation value R0 of the fuel cell system is obtained by constructing an equivalent resistance model of the fuel cell system through the pipeline connection relationship.

[0060] The insulation value under the test of the fuel cell system insulation fault state is input into the insulation model for simulation, and the simulation is reproduced by changing a certain insulation value.

[0061] In summary, this invention provides an insulation design method for fuel cell systems. The result obtained by this method is the insulation value R0 of the fuel cell system. According to the equivalent circuit model, during the product design stage, the conductivity value of the deionized water coolant is determined according to requirements, and the pipeline specifications are fixed. The R0 value is closely related only to the insulation value of each component. Therefore, within the product insulation value requirement range, the insulation values ​​of the components required to ensure the product insulation value are simulated, providing a basis for the insulation requirements of components in fuel cell system applications and the required conductivity value of the coolant in fuel cell systems, filling the gaps in the product development process.

[0062] Using the fuel cell system insulation fault diagnosis method, during the insulation fault investigation phase, the actual value of deionized water conductivity can be measured, the pipeline specifications are determined, and the insulation values ​​of components are provided by the supplier. Therefore, theoretically, the system insulation value R0 is determined. However, the actual system insulation value R0 is in a fault state, i.e., R0s. The system insulation value R0s can be simulated by changing the variable - the insulation value of the component. In this way, a certain component in an insulation fault state can be identified. This method can simplify the problem investigation process, improve the efficiency of problem solving, and solve the problem that on-site personnel are unable to investigate due to limited conditions.

[0063] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An insulation design method for a fuel cell system, characterized in that, This includes developing insulation design specifications for fuel cell systems; Build an insulation model based on the fuel cell system piping connection diagram; Insulation parameters of the fuel cell system, insulation requirements of each component and pipeline are obtained through insulation model simulation. Determine whether the insulation requirements of each component and pipeline meet the established insulation design specifications for the fuel cell system. If they do, proceed with product development based on the simulation results. Otherwise, re-optimize the parameters and re-simulate; Among them, the insulation parameters of the fuel cell system, the insulation requirements of each component and pipeline are obtained through insulation model simulation, including the data on the insulation performance of each component and pipeline itself obtained through insulation testing. The overall insulation value R0 of the fuel cell system is obtained by constructing an equivalent resistance model of the fuel cell system through the pipeline connection relationship of the fuel cell system. The insulation test of each component was performed multiple times under the same conductivity of the filling liquid, and the average value was taken. In this process, a fixed length of pipeline is taken from the actual application of the product, filled with a filling liquid, and the insulation value at both ends of the pipeline is tested to obtain the insulation performance data of the pipeline. The specifications of each section of the pipeline in actual application are measured, and the conductivity value of each section of the pipeline is obtained through the insulation resistance calculation formula.

2. The fuel cell system insulation design method according to claim 1, characterized in that, The fixed length is 1m.

3. The fuel cell system insulation design method according to claim 1, characterized in that, The filling solution is deionized water with a concentration of 5 μS / cm.

4. A method for diagnosing insulation faults in a fuel cell system, characterized in that, This includes testing the insulation value of a fuel cell system under insulation fault conditions; Build an insulation model based on the fuel cell system piping connection diagram; The insulation values ​​of the fuel cell system under insulation fault conditions are input into the insulation model for simulation reproduction. Among them, it is determined whether the overall insulation value of the fuel cell system obtained by the insulation model is consistent with the insulation value under the test fuel cell system insulation fault state. If so, the insulation problem node is identified, the successful reproduction is confirmed, and rectification is carried out. Otherwise, re-optimize the parameters and re-simulate; The insulation model includes setting the insulation performance data of each component and pipeline to data under fault-free conditions / production conditions. The overall insulation value R0 of the fuel cell system is obtained by constructing an equivalent resistance model of the fuel cell system through the pipeline connection relationship of the fuel cell system. The insulation value of the fuel cell system under insulation fault conditions is input into the insulation model for simulation, and the simulation is reproduced by changing a certain insulation value.

Images