A method and device for analyzing insulation of a hydrogen fuel cell air subsystem

Abstract

The present invention discloses an insulation analysis method and device for a hydrogen fuel cell air subsystem. By obtaining a system composition diagram of the air subsystem; determining the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline; determining the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram; comparing the equivalent insulation resistance of the air subsystem with the insulation threshold, and according to the comparison result, making insulation adjustments to the components and pipelines in the air subsystem. The insulation analysis method of the present application can clearly reflect the weak insulation areas in the air subsystem by quantifying the insulation index, and then make targeted insulation improvements to shorten the design and development time.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and in particular to an insulation analysis method and device for an air subsystem of a hydrogen fuel cell. Background Art

[0002] At present, hydrogen fuel cell vehicles in the domestic and foreign markets are mainly based on the "electric-electric hybrid" mode, that is, a mixture of fuel cells and batteries. Hydrogen fuel cell vehicles are generally designed based on a pure electric platform, which makes the vehicle system more complex. High voltage and hydrogen coexist, and the high-voltage electrical safety design of the whole vehicle is an important part of the vehicle design, among which high-voltage insulation design is the key and difficult point. The insulation design of the vehicle's pure electric platform has become mature, and the high-voltage insulation design is above 10MΩ. The low insulation of the hydrogen fuel cell system has become a risk point for the insulation of the fuel cell vehicle. The fuel cell reactor needs to use ultra-pure water to dissipate heat, and the factors affecting the insulation performance are relatively complex.

[0003] During the dynamic operation of the fuel cell, a large amount of water will be generated at the cathode of the air subsystem. The high-temperature liquid water will mix in the air circuit. If there are poorly insulated components in the air circuit, the insulation will be reduced.

[0004] Therefore, how to form a set of insulation analysis methods in the early stage of fuel cell air subsystem design is an urgent problem that we need to solve. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide an insulation analysis method and device for the air subsystem of a hydrogen fuel cell, which can clearly reflect the weak insulation areas in the air subsystem and then make targeted insulation improvements.

[0006] According to a first aspect of the present invention, there is provided an insulation analysis method for an air subsystem of a hydrogen fuel cell, comprising:

[0007] Get the system composition diagram of the air subsystem;

[0008] According to the system composition diagram of the air subsystem and the medium flowing in the pipeline, the equivalent insulation resistance of each component and pipeline in the system composition diagram is determined;

[0009] According to the equivalent insulation resistance of each component and pipeline in the system composition diagram, the equivalent insulation resistance of the air subsystem is determined;

[0010] The equivalent insulation resistance of the air subsystem is compared with the insulation threshold, and based on the comparison result, insulation adjustments are made to the components and pipelines in the air subsystem.

[0011] Optionally, according to the flow direction of air from entering the stack to leaving the stack, the system composition diagram includes an air filter, an air flow meter, an air compressor, an intercooler, a humidifier, an inlet shut-off valve, an inlet temperature and pressure sensor, a fuel cell stack, an outlet temperature and pressure sensor, an outlet shut-off valve, a back pressure valve, and a mixed row connected in sequence; it also includes a pressure relief valve connected to the intercooler and the mixed row, and a humidity regulating valve connected in parallel at both ends of the humidifier; wherein the air compressor is also connected to the mixed row, and the outlet shut-off valve and the back pressure valve are also connected to the humidifier;

[0012] According to the system composition diagram of the air subsystem and the medium flowing in the pipeline, the equivalent insulation resistance of each component and pipeline in the system composition diagram is determined, including:

[0013] Perform insulation resistance testing on the metal material components in the system composition diagram to obtain the equivalent insulation resistance of the metal material components;

[0014] The equivalent insulation resistance of each pipeline is determined based on the cross-sectional area of ​​the connecting pipelines between various components, the flow path length of the pipelines, the conductivity of the air cathode tail water, and the water content of the gas in the pipelines.

[0015] Optionally, the air compressor is a high-voltage component, and the casing is grounded, and the equivalent insulation value of the air compressor is 0.

[0016] Optionally, if the pipeline contains high-pressure air, the equivalent insulation resistance of the pipeline can be determined according to the following formula:

[0017] R=L / (0.01σ*S)

[0018] Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

[0019] Optionally, if the pipeline contains pressurized humidified air, the equivalent insulation resistance of the pipeline is determined according to the following formula:

[0020] R=L / (0.05σ*S)

[0021] Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

[0022] Optionally, if the pipeline is a pipeline out of the stack and the air in the pipeline is high humidity, the equivalent insulation resistance of the pipeline is determined according to the following formula:

[0023] R=L / (0.1σ*S)

[0024] Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

[0025] Optionally, the equivalent insulation resistance of the air subsystem is compared with the insulation threshold, and according to the comparison result, insulation adjustment is performed on the components and pipelines in the air subsystem, including:

[0026] If the equivalent insulation resistance of the air subsystem is less than the insulation threshold, the flow path length of the pipeline with the smallest equivalent insulation resistance is increased and / or insulating pads are installed on the mounting feet of the metal material components in the air subsystem.

[0027] Optionally, the pipeline includes two types: air pipe and manifold.

[0028] According to a second aspect of the present invention, there is provided an insulation analysis device for an air subsystem of a hydrogen fuel cell, comprising:

[0029] An acquisition module, used for acquiring a system composition diagram of an air subsystem;

[0030] The first processing module is used to determine the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline;

[0031] The second processing module is used to determine the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram;

[0032] The adjustment module is used to compare the equivalent insulation resistance of the air subsystem with the insulation threshold, and to make insulation adjustments to the components and pipelines in the air subsystem according to the comparison results.

[0033] According to a third aspect of the present invention, an electronic device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the aforementioned insulation analysis method for the hydrogen fuel cell air subsystem when executing the computer program.

[0034] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0035] An insulation analysis method and device for a hydrogen fuel cell air subsystem is provided in an embodiment of this specification. By obtaining a system composition diagram of the air subsystem; determining the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline; determining the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram; comparing the equivalent insulation resistance of the air subsystem with the insulation threshold, and according to the comparison result, making insulation adjustments to the components and pipelines in the air subsystem. The insulation analysis method of the present application can clearly reflect the weak insulation areas in the air subsystem by quantifying the insulation indicators, and then make targeted insulation improvements to shorten the design and development time.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference figures are used to represent the same parts throughout the accompanying drawings.

[0038] In the attached picture:

[0039] Figure 1 A schematic diagram of an electronic device in an embodiment of the present invention is shown.

[0040] Figure 2 A flow chart of an insulation analysis method for an air subsystem of a hydrogen fuel cell in an embodiment of the present invention is shown.

[0041] Figure 3 The figure shows the system composition diagram of the air subsystem in the embodiment of the present invention.

[0042] Figure 4 A schematic diagram of the equivalent insulation resistance of the air subsystem in an embodiment of the present invention is shown.

[0043] Figure 5 A simulation schematic diagram in an embodiment of the present invention is shown.

[0044] Figure 6 A block diagram of an insulation analysis device for a hydrogen fuel cell air subsystem in an embodiment of the present invention is shown.

[0045] icon:

[0046] 100 - electronic equipment; 10 - insulation analysis device of hydrogen fuel cell air subsystem; 20 - memory; 30 - processor; 40 - communication unit. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0050] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] See also Figure 1 , Figure 1 FIG. 1 is a structural block diagram of an electronic device 100 provided in this embodiment. Figure 1 As shown, the electronic device may include an insulation analysis device 10, a memory 20, a processor 30 and a communication unit 40 for a hydrogen fuel cell air subsystem. The memory 20 stores machine-readable instructions executable by the processor 30. When the electronic device 100 is running, the processor 30 and the memory 20 communicate through a bus, and the processor 30 executes the machine-readable instructions and executes the insulation analysis method for the hydrogen fuel cell air subsystem.

[0052] The memory 20, the processor 30 and the communication unit 40 are electrically connected to each other directly or indirectly to achieve signal transmission or interaction. For example, these elements can be electrically connected to each other through one or more communication buses or signal lines. The insulation analysis device 10 of the hydrogen fuel cell air subsystem includes at least one software function module that can be stored in the memory 20 in the form of software or firmware. The processor 30 is used to execute the executable module stored in the memory 20 (for example, the software function module or computer program included in the insulation analysis device 10 of the hydrogen fuel cell air subsystem).

[0053] In some embodiments, the processor 30 is used to perform one or more functions described in this embodiment. In some embodiments, the processor 30 may include one or more processing cores (eg, a single-core processor (S) or a multi-core processor (S)).

[0054] In this embodiment, the memory 20 is used to store programs, and the processor 30 is used to execute the programs after receiving execution instructions. The process definition method disclosed in any implementation of this embodiment can be applied to the processor 30 or implemented by the processor 30.

[0055] The communication unit 40 is used to establish a communication connection between the electronic device 100 and other devices through a network, and to send and receive data through the network.

[0056] In this embodiment, the electronic device 100 may be a vehicle controller, a vehicle-mounted computing platform, etc. This embodiment does not impose any limitation on the specific type of the electronic device.

[0057] Understandably, Figure 1 The structure shown is for illustration only. The electronic device 100 may also have Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown. Figure 1 The components shown may be implemented in hardware, software or a combination thereof.

[0058] based on Figure 1 This embodiment provides an insulation analysis method for a hydrogen fuel cell air subsystem. Figure 1 The electronic device 100 shown in the figure performs the following based on Figure 1 The structure diagram of the electronic device 100 shows the steps of the insulation analysis method of the hydrogen fuel cell air subsystem provided in this embodiment. Figure 2 As shown, the insulation analysis method of the hydrogen fuel cell air subsystem includes steps 101 to 104:

[0059] Step 101: Obtain a system composition diagram of an air subsystem;

[0060] In this embodiment, in order to ensure the smooth progress of the electrochemical reaction of the hydrogen fuel cell stack, it is necessary to continuously supply the hydrogen fuel cell stack with an air flow rate that meets the reaction conditions. The air subsystem is to filter, pressurize, humidify and process the air that is about to enter the hydrogen fuel cell stack to ensure that the temperature, pressure, humidity and flow rate of the air entering the cathode side of the hydrogen fuel cell stack are within the required range.

[0061] The main components of the air subsystem include air compressor, air filter, air flow meter, intercooler, humidifier, fuel cell stack, temperature and pressure sensor, various valve bodies and corresponding air pipelines. The above components work together to provide the hydrogen fuel cell with the corresponding flow of air under appropriate working conditions.

[0062] Specifically, combined with Figure 3 As shown, according to the flow direction of air from entering the stack to leaving the stack, the system composition diagram of the air subsystem includes an air filter 201, an air flow meter 202 connected to one end of the air filter 201, an air compressor 203 connected to the other end of the air flow meter 202, an intercooler 204 connected to the other end of the air compressor 203, and a humidifier 206 connected to the other end of the intercooler; wherein, a humidity regulating valve 205 is connected in parallel at both ends of the humidifier 206; the other end of the humidifier 206 is connected to the fuel cell stack 107 through an inlet shut-off valve 207 and an inlet temperature and pressure sensor 208; the foregoing belong to the air inlet part.

[0063] Regarding the air outflow part, one end of the stack 107 is connected to the outflow temperature and pressure sensor 209, the other end of the temperature and pressure sensor 209 is connected to the outflow stop valve 210, the outflow stop valve 210 is connected to the back pressure valve 212 through the bypass line 211, and the back pressure valve 212 and the outflow stop valve 210 are also connected to the humidifier 206 respectively; the other end of the back pressure valve 212 is connected to the mixing exhaust 114, and the two ends of the pressure relief valve 213 are respectively connected to the intercooler 204 and the mixing exhaust 114; the air compressor 203 is connected to the mixing exhaust 114.

[0064] Step 102: According to the system composition diagram of the air subsystem and the medium flowing in the pipeline, the equivalent insulation resistance of each component and the pipeline in the system composition diagram is determined;

[0065] Combined with the above connection relationship and Figure 3 As shown, it is not difficult to find that the above components are connected in sequence through pipelines. The pipeline is used for the circulation of the medium. In this embodiment, the pipeline includes two types of air pipes and manifolds, wherein the manifold can also be called a pipe assembly block. The cross section of the air pipe is circular, while the cross section of the manifold is square, and the cross-sectional areas of the two are different.

[0066] It should be noted that the medium circulating in the pipeline can be dry air or humid air or high-temperature and high-pressure air. It is worth noting that the water content of the medium circulating in different pipelines is different.

[0067] After obtaining the system composition diagram of the air subsystem, the equivalent insulation resistance analysis can be performed for each component in the system composition diagram in combination with the actual situation. Considering that the medium flowing in the pipeline has a certain conductivity, when performing insulation resistance equivalence, it is necessary to consider not only each component but also the pipeline. Specifically, the following steps can be included:

[0068] Perform insulation resistance testing on the metal material components in the system composition diagram to obtain the equivalent insulation resistance of the metal material components;

[0069] The equivalent insulation resistance of each pipeline is determined based on the cross-sectional area of ​​the connecting pipelines between various components, the flow path length of the pipelines, the conductivity of the air cathode tail water, and the water content of the gas in the pipelines.

[0070] Combination Figure 4 As shown, in order to improve the integration, the stack inlet shut-off valve 207 and the stack inlet temperature and pressure sensor 208 are generally integrated into the air stack inlet manifold. The stack outlet shut-off valve 210 and the stack outlet temperature and pressure sensor 209 are integrated into the air stack outlet manifold, and the manifold is made of insulating non-metallic materials. The intercooler 204, the humidity regulating valve 205, the pressure relief valve 213, and the back pressure valve 212 are metal parts. In order to improve the insulation, the installation foot bolts are added with insulating bushings. The air compressor 203 is a high-voltage component, and the casing is directly grounded. Therefore, the air filter 201 and the air flow meter 202 connected to the air compressor are not considered when performing insulation resistance equivalence. The insulation resistance R224 corresponding to the air compressor has a resistance value of 0. The mixed pipeline is very long, and is generally considered as the insulation of the whole vehicle, which is not considered here.

[0071] Combination Figure 5 As shown, R500 is the insulation resistance of the hydrogen fuel cell controller FCCU. Because the hydrogen fuel cell controller is a low-voltage controller, there is no internal isolation, that is, the power ground and the shell share the same ground, so the insulation resistance of R500 is 0. R220 and R223 are the insulation resistance of the low-voltage circuit of the sensor to the shell, which can be measured. The inlet and outlet stop valves are installed on non-metallic manifolds. R221 and R222 refer to the insulation resistance of the valve's low-voltage circuit to the metal shell. The back pressure valve, pressure relief valve, humidity control valve and intercooler mounting foot bolts are equipped with insulating sheaths. R225, R226, R227 and R228 are the insulation resistance of the back pressure valve, pressure relief valve, humidity control valve and intercooler low-voltage circuit to the metal shell.

[0072] When considering the insulation resistance of the pipeline, it is necessary to consider the cross-sectional area of ​​the pipeline, the flow path length of the pipeline, and the conductivity of the air cathode tail water. It should be noted that the medium in the pipeline has different water contents, which will lead to different conductivities of the medium in the pipeline. This embodiment uses the conductivity of the air cathode tail water as a benchmark, and multiplies the conductivity of the air cathode tail water by different coefficients based on the different water contents in the medium. It should be noted that the value of the coefficient is based on multiple conductivity test experiments.

[0073] Specifically, combined with Figure 4 , Figure 5 As shown, the empty pipes entering the stack corresponding to the insulation resistors R205, R208, and R209 have high-pressure air inside, that is, air compressed by an air compressor. Since the moisture content increases after compression, the conductivity can be taken as 0.01*σ, where σ is the conductivity of the air cathode tail water discharge.

[0074] The insulation resistance R205, R208, and R209 of the empty pipeline entering the stack can be determined according to the following formula:

[0075] R=L / (0.01σ*S)

[0076] Among them, R is the equivalent insulation resistance of the empty pipeline, L is the flow path length of the empty pipeline; S is the cross-sectional area of ​​the empty pipeline; σ is the conductivity of the air cathode tail water.

[0077] Similarly, the medium flowing in the manifold corresponding to the insulation resistors R200 and R201 is humidified air. Because this part of the air has been humidified by the humidifier, the water content in the air increases, and the corresponding conductivity also increases. Therefore, the conductivity of the medium in this part of the manifold is 0.05*σ.

[0078] The insulation resistance R200 and R201 of the stack manifold can be determined according to the following formula:

[0079] R=L / (0.01σ*S)

[0080] Wherein, R is the equivalent insulation resistance of the manifold, L is the flow channel length of the manifold; S is the cross-sectional area of ​​the manifold; σ is the conductivity of the air cathode tail water.

[0081] As for the empty pipelines out of the stack corresponding to the insulation resistors R202, R203, R204, R206, and R207, 70% of water will be produced during the operation of the hydrogen fuel cell. A large amount of liquid water is mixed in the high-temperature and fast-flowing air and discharged to the outside, which greatly increases the conductivity of the air pipeline. Therefore, the conductivity of the medium in this branch pipe is taken as 0.1*σ.

[0082] The equivalent insulation resistance R202, R203, R204, R206, and R207 of the empty pipeline can be determined according to the following formula:

[0083] R=L / (0.1σ*S)

[0084] Among them, R is the equivalent insulation resistance of the empty pipeline, L is the flow path length of the empty pipeline; S is the cross-sectional area of ​​the empty pipeline; σ is the conductivity of the air cathode tail water.

[0085] Since the cross-sectional areas of the empty pipeline and the manifold are different, there are differences in calculating the equivalent insulation resistance. In this embodiment, the manifold and the empty pipeline are considered separately, and the conductivity of the medium in the pipeline is further carefully distinguished to obtain a more accurate equivalent insulation resistance, thereby improving the accuracy of insulation analysis.

[0086] Step 103: Determine the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram;

[0087] In this embodiment, after obtaining the equivalent insulation resistance of each component and pipeline in the system composition diagram, the equivalent insulation resistance of the entire air subsystem can be calculated. Figure 5 As shown, in the electrical simulation software, first follow Figure 4 Draw a circuit diagram, then add a DC power supply 231 to the circuit, and connect an ammeter 230 in series to the main circuit, and the equivalent insulation resistance of the entire air subsystem can be calculated. This embodiment does not limit this.

[0088] After obtaining the equivalent insulation resistance of the entire air subsystem, it is easy to find the weak insulation areas.

[0089] Step 104: Compare the equivalent insulation resistance of the air subsystem with the insulation threshold, and make insulation adjustments to the components and pipelines in the air subsystem based on the comparison result.

[0090] In practical applications, the insulation requirements for the air subsystem vary according to different needs. An insulation threshold can be preset according to actual needs. The insulation threshold is a preset value used to determine whether the insulation of the air subsystem meets the required benchmark. In this embodiment, the value of the insulation threshold can refer to the insulation design requirements of the hydrogen fuel cell system.

[0091] Compare the equivalent insulation resistance of the air subsystem with the insulation threshold. The comparison results can be divided into two types: one is that the equivalent insulation resistance of the air subsystem is less than the insulation threshold, or the equivalent insulation resistance of the air subsystem is greater than or equal to the insulation threshold. If the equivalent insulation resistance of the air subsystem is greater than or equal to the insulation threshold, it means that the insulation performance of the air subsystem meets the requirements. If the equivalent insulation resistance of the air subsystem is less than the insulation threshold, it means that the insulation performance of the air subsystem does not meet the requirements and needs to be adjusted accordingly. Regarding how to make adjustments, the following steps can be included:

[0092] If the equivalent insulation resistance of the air subsystem is less than the insulation threshold, the flow path length of the pipeline with the smallest equivalent insulation resistance is increased and / or insulating pads are installed on the mounting feet of the metal material components in the air subsystem.

[0093] With reference to the foregoing, it is not difficult to understand that when the equivalent insulation resistance of the air subsystem is less than the insulation threshold, the insulation performance of the system needs to be improved. By checking the equivalent insulation resistance of the entire air subsystem, it is easy to find areas where the insulation is weak, so that the staff can make targeted improvements to the areas where the insulation is weak. For example, the insulation resistance value can be effectively increased by increasing the length of the pipeline. On the other hand, the insulation performance of the system can also be improved by installing insulating pads on the mounting feet of the metal material components in the system. After the insulation problem occurs, the method of this embodiment can be used to effectively analyze it, and it can be avoided in the early stages of the development of the hydrogen fuel cell system to avoid batch rectification of products.

[0094] In summary, the embodiments of this specification provide an insulation analysis method for a hydrogen fuel cell air subsystem. By obtaining a system composition diagram of the air subsystem; determining the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline; determining the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram; comparing the equivalent insulation resistance of the air subsystem with the insulation threshold, and according to the comparison result, making insulation adjustments to the components and pipelines in the air subsystem. The insulation analysis method of the present application can clearly reflect the weak insulation areas in the air subsystem by quantifying the insulation indicators, and then make targeted insulation improvements to shorten the design and development time.

[0095] Based on the same inventive concept, Figure 6 As shown, an embodiment of the present invention further provides an insulation analysis device for an air subsystem of a hydrogen fuel cell, comprising: an acquisition module, a first processing module, a second processing module and an adjustment module.

[0096] The acquisition module is used to obtain the system composition diagram of the air subsystem;

[0097] The first processing module is used to determine the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline;

[0098] The second processing module is used to determine the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram;

[0099] The adjustment module is used to compare the equivalent insulation resistance of the air subsystem with the insulation threshold, and according to the comparison result, perform insulation adjustment on the components and pipelines in the air subsystem.

[0100] In an optional embodiment, according to the flow direction of air from entering the stack to leaving the stack, the system composition diagram includes an air filter, an air flow meter, an air compressor, an intercooler, a humidifier, an inlet shut-off valve, an inlet temperature and pressure sensor, a battery stack, an outlet temperature and pressure sensor, an outlet shut-off valve, a back pressure valve, and a mixed row connected in sequence; it also includes a pressure relief valve connected to the intercooler and the mixed row, and a humidity regulating valve connected in parallel at both ends of the humidifier; wherein the air compressor is also connected to the mixed row, and the outlet shut-off valve and the back pressure valve are also connected to the humidifier;

[0101] According to the system composition diagram of the air subsystem and the medium flowing in the pipeline, the equivalent insulation resistance of each component and pipeline in the system composition diagram is determined, including:

[0102] Perform insulation resistance testing on the metal material components in the system composition diagram to obtain the equivalent insulation resistance of the metal material components;

[0103] The equivalent insulation resistance of each pipeline is determined based on the cross-sectional area of ​​the connecting pipelines between various components, the flow path length of the pipelines, the conductivity of the air cathode tail water, and the water content of the gas in the pipelines.

[0104] In an optional implementation, the air compressor is a high-voltage component, and the casing is grounded, and the equivalent insulation value of the air compressor is 0.

[0105] In an optional implementation, the first processing module is further configured to:

[0106] If the pipeline contains high-pressure air, the equivalent insulation resistance of the pipeline can be determined according to the following formula:

[0107] R=L / (0.01σ*S)

[0108] Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

[0109] In an optional implementation, the first processing module is further configured to:

[0110] If the pipeline contains pressurized humidified air, the equivalent insulation resistance of the pipeline is determined according to the following formula:

[0111] R=L / (0.05σ*S)

[0112] Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

[0113] In an optional implementation, the first processing module is further configured to:

[0114] If the pipeline is a stack outlet pipeline and the air in the pipeline is high humidity, the equivalent insulation resistance of the pipeline is determined according to the following formula:

[0115] R=L / (0.1σ*S)

[0116] Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

[0117] In an optional implementation, the adjustment module is further used for:

[0118] Compare the equivalent insulation resistance of the air subsystem with the insulation threshold, and make insulation adjustments to the components and pipelines in the air subsystem based on the comparison results, including:

[0119] If the equivalent insulation resistance of the air subsystem is less than the insulation threshold, the flow path length of the pipeline with the smallest equivalent insulation resistance is increased and / or insulating pads are installed on the mounting feet of the metal material components in the air subsystem.

[0120] In summary, the embodiments of this specification provide an insulation analysis method and device for a hydrogen fuel cell air subsystem. By obtaining a system composition diagram of the air subsystem; determining the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline; determining the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram; comparing the equivalent insulation resistance of the air subsystem with the insulation threshold, and according to the comparison result, making insulation adjustments to the components and pipelines in the air subsystem. The insulation analysis method of the present application can clearly reflect the weak insulation areas in the air subsystem by quantifying the insulation indicators, and then make targeted insulation improvements to shorten the design and development time.

[0121] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the insulation analysis device of the hydrogen fuel cell air subsystem described above can refer to the corresponding process in the aforementioned method and will not be elaborated here.

[0122] The above are only various embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for analyzing the insulation of a hydrogen fuel cell air subsystem, characterized in that: include: Get the system composition diagram of the air subsystem; According to the system composition diagram of the air subsystem and the medium flowing in the pipeline, the equivalent insulation resistance of each component and pipeline in the system composition diagram is determined; According to the equivalent insulation resistance of each component and pipeline in the system composition diagram, the equivalent insulation resistance of the air subsystem is determined; Comparing the equivalent insulation resistance of the air subsystem with the insulation threshold, and adjusting the insulation of components and pipelines in the air subsystem according to the comparison result; According to the flow direction of air from entering the stack to leaving the stack, the system composition diagram includes an air filter, an air flow meter, an air compressor, an intercooler, a humidifier, an inlet shut-off valve, an inlet temperature and pressure sensor, a fuel cell stack, an outlet temperature and pressure sensor, an outlet shut-off valve, a back pressure valve, and a mixed row connected in sequence; it also includes a pressure relief valve connected to the intercooler and the mixed row, and a humidity regulating valve connected in parallel at both ends of the humidifier; wherein the air compressor is also connected to the mixed row, and the outlet shut-off valve and the back pressure valve are also connected to the humidifier; Determining the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline includes: Performing insulation resistance testing on the metal material components in the system composition diagram to obtain equivalent insulation resistance of the metal material components; The equivalent insulation resistance of each pipeline is determined based on the cross-sectional area of ​​the connecting pipelines between various components, the flow path length of the pipelines, the conductivity of the air cathode tail water, and the water content of the gas in the pipelines.

2. The method according to claim 1, characterized in that The air compressor is a high-voltage component, and its casing is grounded. The equivalent insulation value of the air compressor is 0.

3. The method according to claim 1, characterized in that If the pipeline contains high-pressure air, the equivalent insulation resistance of the pipeline is determined according to the following formula: R=L / (0.01σ*S) Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

4. The method according to claim 1, characterized in that: If the pipeline contains pressurized humidified air, the equivalent insulation resistance of the pipeline is determined according to the following formula: R=L / (0.05σ*S) Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

5. The method according to claim 1, characterized in that: If the pipeline is a stack outlet pipeline and the air in the pipeline is high humidity, the equivalent insulation resistance of the pipeline is determined according to the following formula: R=L / (0.1σ*S) Among them, R is the equivalent insulation resistance of the pipeline, L is the flow path length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the air cathode tail water.

6. The method according to claim 1, characterized in that The step of comparing the equivalent insulation resistance of the air subsystem with the insulation threshold and adjusting the insulation of components and pipelines in the air subsystem according to the comparison result includes: If the equivalent insulation resistance of the air subsystem is less than the insulation threshold, the flow path length of the pipeline with the smallest equivalent insulation resistance is increased and / or insulating pads are installed on the mounting feet of the metal material components in the air subsystem.

7. The method according to claim 1, characterized in that The pipelines include two types: air pipes and manifolds.

8. An insulation analysis device for a hydrogen fuel cell air subsystem, characterized in that: include: An acquisition module, used for acquiring a system composition diagram of an air subsystem; The first processing module is used to determine the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline; according to the flow direction of air from entering the stack to leaving the stack, the system composition diagram includes an air filter, an air flow meter, an air compressor, an intercooler, a humidifier, an inlet shut-off valve, an inlet temperature and pressure sensor, a stack, an outlet temperature and pressure sensor, an outlet shut-off valve, a back pressure valve, and a mixed row connected in sequence; it also includes a pressure relief valve connected to the intercooler and the mixed row, and a humidity regulating valve connected in parallel at both ends of the humidifier; wherein the air compressor is also connected to the mixed row, and the outlet shut-off valve and the back pressure valve are also connected to the humidifier; Determining the equivalent insulation resistance of each component and pipeline in the system composition diagram according to the system composition diagram of the air subsystem and the medium flowing in the pipeline includes: Performing insulation resistance testing on the metal material components in the system composition diagram to obtain equivalent insulation resistance of the metal material components; Determine the equivalent insulation resistance of each pipeline based on the cross-sectional area of ​​the pipelines connecting the components, the flow path length of the pipelines, the conductivity of the air cathode tail water, and the water content of the gas in the pipelines; A second processing module is used to determine the equivalent insulation resistance of the air subsystem according to the equivalent insulation resistance of each component and pipeline in the system composition diagram; The adjustment module is used to compare the equivalent insulation resistance of the air subsystem with the insulation threshold, and to perform insulation adjustment on the components and pipelines in the air subsystem according to the comparison result.

9. An electronic device, characterized in that: The electronic device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the insulation analysis method for the hydrogen fuel cell air subsystem described in any one of claims 1-7 when executing the computer program.

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