A method and device for establishing an insulation model

Abstract

The present invention discloses a method and device for establishing an insulation model, which distinguishes grounded components and non-grounded components in a hydrogen system; performs insulation resistance detection on each non-grounded component to obtain the insulation resistance of each non-grounded component; performs insulation resistance equivalent processing on each section of a pipeline in the hydrogen system to determine the equivalent insulation resistance of the pipeline; and establishes an insulation model of the hydrogen system based on the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline. In this way, according to the established hydrogen insulation model, the insulation weaknesses of the hydrogen system can be clearly reflected, so as to implement insulation improvement measures in a targeted manner. In addition, the hydrogen insulation model can quantify insulation indicators, solve the current difficulties in hydrogen fuel cell insulation risks and unclear indicators, shorten the development time, and is of milestone significance to the insulation design of hydrogen fuel cells.

Description

Technical Field

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

[0002] Hydrogen fuel cell vehicles are generally designed based on a pure electric platform, which makes the vehicle system more complex, with high voltage and hydrogen coexisting. The high-voltage electrical safety design of the vehicle is an important part of the vehicle design, among which the 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 an insulation risk point for hydrogen fuel cell vehicles. The hydrogen fuel cell reactor needs to use ultrapure water to dissipate heat, and the factors affecting the insulation performance are relatively complex. In addition, during the dynamic operation of the hydrogen fuel cell, the anode of the hydrogen system will produce some water, and the high-temperature gaseous water will be mixed in the hydrogen circuit, which will affect the insulation of the hydrogen system circuit.

[0003] In the early stages of hydrogen system development, insulation design was based on engineers’ experience and there were no quantitative indicators, which led to frequent insulation problems in the system. After insulation problems occurred, there was no way to effectively analyze them, and the only approach was to “treat the symptoms first and the root cause first”, which led to batch rectification of products, which was time-consuming and costly. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a method and device for establishing an insulation model. In the early stage of hydrogen system development, an insulation design model of the hydrogen system is established, which can intuitively display the weak insulation areas, thereby improving the weak insulation areas in a targeted manner.

[0005] According to a first aspect of the present invention, there is provided a method for establishing an insulation model, which is applied to a hydrogen system of a hydrogen fuel cell; the method comprises:

[0006] Distinguish between grounded and non-grounded components in the hydrogen system; grounded components include hydrogen pump, hydrogen inlet solenoid valve, hydrogen medium pressure sensor, proportional valve; non-grounded components include hydrogen inlet pressure sensor, fuel cell, hydrogen outlet sensor, moisture device, hydrogen discharge valve, water discharge valve;

[0007] Performing insulation resistance testing on each non-grounded component respectively to obtain the insulation resistance of each non-grounded component;

[0008] Perform insulation resistance equivalence processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of each section of the pipeline;

[0009] An insulation model of the hydrogen system is established based on the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline.

[0010] Optionally, insulation resistance equivalence processing is performed on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of each section of the pipeline, including:

[0011] For each section of pipeline, determine the medium in the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline;

[0012] According to the medium in the pipeline, the conductivity of the pipeline is obtained;

[0013] Determine the equivalent insulation resistance of the pipeline based on the electrical conductivity of the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline.

[0014] Optionally, the conduit includes a flow tube and a manifold.

[0015] Optionally, determine the medium in the pipeline, including:

[0016] Determine whether the pipeline is a pipeline before entering the stack;

[0017] If yes, the medium in the pipeline is dry gas;

[0018] If not, the medium in the pipeline is high-humidity gas.

[0019] Optionally, the equivalent insulation resistance of the pipeline is determined based on the electrical conductivity of the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline, including:

[0020] Determine the equivalent insulation resistance of the pipeline using the following formula:

[0021] R=L / (kσ*S)

[0022] Among them, R is the equivalent insulation resistance of the pipeline, L is the length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the hydrogen anode tail water, and k is the dielectric coefficient.

[0023] Optionally, if the medium is dry gas, k is 0.001; if the medium is high-humidity gas, k is 0.05.

[0024] According to a second aspect of the present invention, there is provided an insulation model building device, comprising:

[0025] A distinguishing module is used to distinguish between grounded components and non-grounded components in the hydrogen system; the grounded components include a hydrogen pump, a hydrogen inlet solenoid valve, a hydrogen medium pressure sensor, and a proportional valve; the non-grounded components include a hydrogen inlet pressure sensor, a fuel cell, a hydrogen outlet sensor, a moisture device, a hydrogen discharge valve, and a water discharge valve;

[0026] A detection module is used to perform insulation resistance detection on each non-grounded component to obtain the insulation resistance of each non-grounded component;

[0027] The equivalent module is used to perform insulation resistance equivalent processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of each section of the pipeline;

[0028] The model building module is used to build an insulation model of the hydrogen system according to the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline.

[0029] 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 aforementioned insulation model establishment method is implemented when the processor executes the computer program.

[0030] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the aforementioned insulation model establishment method is implemented.

[0031] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0032] The embodiments of this specification provide a method and device for establishing an insulation model, which distinguishes between grounded components and non-grounded components in a hydrogen system; performs insulation resistance detection on each non-grounded component to obtain the insulation resistance of each non-grounded component; performs insulation resistance equivalent processing on each section of a pipeline in the hydrogen system to determine the equivalent insulation resistance of the pipeline; and establishes an insulation model of the hydrogen system based on the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline. In this way, based on the established hydrogen insulation model, the weak insulation areas of the hydrogen system can be clearly reflected, so as to implement insulation improvement measures in a targeted manner; and, through the hydrogen insulation model, the insulation index can be quantified, solving the current difficulties in hydrogen fuel cell insulation risks and unclear indicators, shortening the development time, and having milestone significance for hydrogen fuel cell insulation design.

[0033] 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

[0034] 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.

[0035] In the attached picture:

[0036] Figure 1 A schematic diagram of an electronic device in an embodiment of the present invention is shown.

[0037] Figure 2 A flow chart of a method for establishing an insulation model in an embodiment of the present invention is shown.

[0038] Figure 3 The figure shows the composition diagram of the hydrogen system in the embodiment of the present invention.

[0039] Figure 4 A schematic diagram of equivalent insulation resistance of a hydrogen system in an embodiment of the present invention is shown.

[0040] Figure 5 A schematic diagram of hydrogen system insulation simulation in an embodiment of the present invention is shown.

[0041] icon:

[0042] 100-electronic device; 10-insulation model building device; 20-memory; 30-processor; 40-communication unit;

[0043] 101-hydrogen source; 102-hydrogen inlet solenoid valve; 103-hydrogen medium pressure sensor; 104-proportional valve; 105-hydrogen inlet module; 106-hydrogen inlet pressure sensor; 107-fuel cell; 108-hydrogen outlet sensor; 109-hydrogen pump; 110-moisture device; 111-hydrogen discharge valve; 112-drain valve; 113-moisture module; 114-tail drain pipe; 120-ammeter; 121-DC power supply; DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 model establishment device 10, a memory 20, a processor 30 and a communication unit 40. 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 model establishment method.

[0048] The memory 20, the processor 30 and the communication unit 40 are electrically connected to each other directly or indirectly to realize 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 model establishment device 10 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 model establishment device 10).

[0049] 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)).

[0050] For ease of description, only one processor is described in the electronic device 100. However, it should be noted that the electronic device 100 in this embodiment may also include multiple processors, so the steps performed by one processor described in this embodiment may also be performed jointly or individually by multiple processors.

[0051] 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.

[0052] 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.

[0053] In this embodiment, the electronic device 100 may be, but is not limited to, a laptop computer, a vehicle-side controller, etc. This embodiment does not impose any limitation on the specific type of the electronic device.

[0054] 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.

[0055] based on Figure 1 This embodiment provides an insulation model establishment method, which is applied to the hydrogen system of a hydrogen fuel cell. Figure 1 The electronic device 100 shown in FIG. 1 performs the following operation based on Figure 1 The structure diagram of the electronic device 100 shown in FIG. 1 is used to describe in detail the steps of the insulation model establishment method provided in this embodiment. Figure 2 As shown, the insulation model establishment method includes steps 101 to 104:

[0056] Step 101: Distinguish between grounded components and non-grounded components in a hydrogen system;

[0057] Among them, a hydrogen fuel cell is a power generation device that converts the chemical energy in the fuel into electrical energy through a redox reaction with oxygen or other oxidants. The fuel is generally hydrogen. Hydrogen is decomposed into electrons and hydrogen ions by the catalyst in the anode of the hydrogen fuel cell. Among them, the hydrogen ions pass through the proton exchange membrane (Proton Exchange Membrane) to the cathode and react with oxygen to become water and heat. The corresponding electrons flow from the anode to the cathode through the external circuit to generate electricity.

[0058] It is easy to understand that, combined with Figure 3 As shown, in a hydrogen fuel cell, the entire flow of hydrogen from entering the stack to leaving the stack can be regarded as a hydrogen system. And the components required for the hydrogen system are basically determined in the design stage. The specific insulation performance of the hydrogen system can be understood by establishing a corresponding insulation model based on the components and pipelines involved in the hydrogen system. During the design period, based on the insulation model of the hydrogen system, the weak insulation areas in the hydrogen system can be understood, and targeted adjustments can be made as needed, which is convenient and efficient, avoiding rectification in the later stages of production.

[0059] Specifically, the hydrogen system includes the components involved in the reaction, valve bodies, and pipelines for circulation. Hydrogen is used as the circulating medium, such as Figure 3As shown, the hydrogen source 101 passes through a pipeline to the hydrogen inlet solenoid valve 102, and then passes through a pipeline to the hydrogen medium pressure sensor 103, and the hydrogen medium pressure sensor 103 is connected to the proportional valve 104 through a pipeline; wherein, in order to improve the integration, the three components of the hydrogen inlet solenoid valve 102, the hydrogen medium pressure sensor 103, and the proportional valve 104 are generally designed in a metal module as the hydrogen inlet module 105, which is generally an aluminum alloy structural member. At this time, the hydrogen in the pipeline has not yet entered the battery stack to react, and the moisture content in the medium is very small, which can be regarded as dry gas. The proportional valve 104 is connected to the hydrogen inlet pressure sensor 106 through a pipeline. It should be noted that the pipeline here is also connected to the hydrogen pump 109, and the hydrogen pump sends the reacted mixture containing hydrogen, air, and water into the inlet pipeline again for reaction. From here on, the water content of the circulating medium in the pipeline begins to increase greatly, which can be regarded as high-humidity gas. After passing through the hydrogen inlet pressure sensor 106, the hydrogen enters the fuel cell stack 107 and starts to react, becoming a mixture containing hydrogen, air, and water, and flows out of the outlet pipe, passes through the hydrogen outlet sensor 108, and then enters the moisture device 110; at this time, the temperature of the circulating medium in the pipeline is about 80 degrees, and is accompanied by liquid water and incompletely reacted hydrogen; therefore, the moisture device will first filter the liquid water in the circulating medium, and the filtered mixed gas will be transported back to the inlet pipe through the hydrogen pump 109. It should be noted that the filtered mixed gas still contains a lot of water. In addition, the moisture device 110 is also connected to the hydrogen discharge valve 111 and the drain valve 112 through pipelines; the moisture device 110 integrates the hydrogen discharge valve 111 and the drain valve 112 in structure to form a moisture module 113, which is generally a plastic part in order to improve insulation; the module can also be designed as a metal part, with mounting foot bolts and insulating bushings. The hydrogen discharge valve 111 and the drain valve 112 are connected to the tail pipe 114 through pipelines.

[0060] Among them, the components in the above hydrogen system can be divided into grounded components and non-grounded components. The grounded components include the hydrogen pump and the hydrogen inlet module, namely the hydrogen inlet solenoid valve, the hydrogen medium pressure sensor, and the proportional valve; the hydrogen pump is also called a hydrogen circulation pump. The hydrogen pump uses a high-pressure hydrogen pump or a low-pressure hydrogen pump. The hydrogen pump head is mostly a metal part. The high-pressure hydrogen pump housing must be grounded, and the low-pressure hydrogen pump housing is the ground.

[0061] The non-grounded components include the hydrogen inlet pressure sensor, the fuel cell stack, the hydrogen outlet sensor, the moisture device, the hydrogen drain valve, and the water drain valve.

[0062] Step 102: performing insulation resistance detection on each non-grounded component to obtain the insulation resistance of each non-grounded component;

[0063] In this embodiment, after the grounding classification of each component in the hydrogen system is performed, it is determined which components are non-grounded components. For non-grounded components, insulation resistance calculation is required. Generally, the insulation resistance corresponding to the component can be obtained by performing insulation resistance detection on the non-grounded component. In the prior art, insulation resistance detection is a relatively mature technology, which will not be described in detail in this embodiment.

[0064] Step 103: Performing insulation resistance equivalent processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of each section of the pipeline;

[0065] It should be noted that in the prior art, when calculating the insulation resistance of the hydrogen system, the components involved in the hydrogen system are mainly considered, while the calculation of the equivalent insulation resistance of the pipeline is ignored. However, since hydrogen fuel cell vehicles involve driving safety, they have higher requirements for insulation performance.

[0066] When calculating the system insulation resistance, this embodiment not only considers the insulation resistance calculation of the components involved in the hydrogen system, but also considers the equivalent insulation resistance calculation of the pipeline. Moreover, if insulation adjustment is required later, since the components involved are mostly fixed, the pipeline adjustment is relatively simple, which facilitates the insulation adjustment effect. Therefore, this embodiment also performs insulation resistance equivalent processing on the pipeline in the hydrogen system to determine the equivalent insulation resistance of the pipeline.

[0067] Step 104: Establish an insulation model of the hydrogen system according to the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline.

[0068] Combination Figure 4-Figure 5 As shown in the figure, the insulation resistance of the grounded components is 0. When establishing the insulation model of the hydrogen system, the insulation resistance of the grounded components does not need to be considered. It is only necessary to combine the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline. Finally, the overall insulation resistance of the hydrogen system can be obtained, and the insulation model of the hydrogen system can be established based on this.

[0069] The above description describes the insulation resistance detection of components in the hydrogen system. For each section of the pipeline in the hydrogen system, insulation resistance equivalent processing is performed. This embodiment provides the following steps:

[0070] For each section of pipeline, determine the medium in the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline;

[0071] According to the medium in the pipeline, the conductivity of the pipeline is obtained;

[0072] Determine the equivalent insulation resistance of the pipeline based on the electrical conductivity of the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline.

[0073] The pipeline includes the flow pipe and the manifold. The flow pipe refers to the pipeline between two components, and the cross section of the flow pipe is mostly circular. The manifold can also be called a pipe manifold. The cross section of the manifold is not necessarily circular, but may be square or other shapes, which leads to different cross-sectional areas of the flow pipe and the manifold, affecting the calculation of the equivalent insulation resistance of the pipeline.

[0074] It should be noted that the medium circulating in the pipeline may be dry air, humid air, or high-temperature and high-pressure air, etc. The water content of the medium circulating in different pipelines may be different.

[0075] In addition, corresponding to the present embodiment, the gas in the pipeline before entering the stack is mostly low in water content, while in the pipeline after entering the stack, since the internal circulating medium contains reacted water and the temperature is relatively high, reaching 80 degrees, this leads to a high water content in the medium in the pipeline after entering the stack.

[0076] Based on this, when calculating the equivalent insulation resistance of a pipeline, it is necessary to consider different situations. On the one hand, the type of pipeline should be considered. Different pipelines have different cross-sectional areas. On the other hand, the water content of the medium flowing in the pipeline should be considered. Different water contents will affect the conductivity of the medium.

[0077] Optionally, determine the medium in the pipeline, including:

[0078] Determine whether the pipeline is a pipeline before entering the stack;

[0079] If yes, the medium in the pipeline is dry gas;

[0080] If not, the medium in the pipeline is high-humidity gas.

[0081] Specifically, combined Figure 3 As shown in the figure, the pipeline before the hydrogen inlet pressure sensor can be regarded as the inlet pipeline, and the inlet pipeline does not include the part of the pipeline where the hydrogen pump is connected to the hydrogen inlet pressure sensor. The medium flowing in the inlet pipeline is regarded as dry gas. The remaining pipelines can be regarded as the outlet pipeline, and the medium flowing in this part of the pipeline can be regarded as high-humidity gas.

[0082] After determining the type of pipeline and the medium flowing in the pipeline, the equivalent insulation resistance of the pipeline can be determined by the following formula based on the conductivity of the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline:

[0083] R=L / (kσ*S)

[0084] Among them, R is the equivalent insulation resistance of the pipeline, L is the length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the hydrogen anode tail water, and k is the dielectric coefficient. If the medium is dry gas, k is 0.001; if the medium is high-humidity gas, k is 0.05.

[0085] The length of the pipeline and the cross-sectional area of ​​the pipeline can be measured in real life or in 3D. This embodiment takes the conductivity σ of the hydrogen anode tail water as a benchmark, and multiplies the conductivity σ of the hydrogen anode tail water by different coefficients k according to the different water content in the medium. It should be noted that the value of the coefficient k is based on multiple conductivity test experiments. The conductivity of the hydrogen anode tail water can be calculated through multiple experimental measurements.

[0086] Specifically, combined Figure 4 , Figure 5 As shown, the inside of the pipeline entering the stack is dry gas. When calculating the resistance value of the equivalent insulation resistance R106, the conductivity can be taken as 0.001*σ. The other pipelines leaving the stack are high-humidity gas. When calculating the resistance values ​​of the equivalent insulation resistances R100, R101, R102, R103, R104, R105, and R107, the conductivity can be taken as 0.05*σ.

[0087] R500 is the insulation resistance of the hydrogen fuel cell controller FCCU. Because FCCU is a low-voltage controller, it is not isolated internally, that is, the power ground and the shell share the same ground, so the insulation resistance of R500 is 0. R120 and R128 are the insulation resistance of the low-voltage line of the sensor to the shell, which can be measured. R125, R126, and R127 are integrated on the moisture module 113. If the moisture module 113 is a metal part, the values ​​of R125, R126, and R127 are 0. If the moisture module 113 is a plastic part or a metal part with an insulating pad, R125, R126, and R127 are the insulation resistance of the low-voltage line to the shell.

[0088] In this embodiment, after obtaining the equivalent insulation resistance of each component and pipeline in the hydrogen system, the equivalent insulation resistance of the entire hydrogen system 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 121 to the circuit and connect an ammeter 120 in series to the main circuit, and then the equivalent insulation resistance of the entire hydrogen system can be calculated.

[0089] In summary, the embodiment of this specification provides a method for establishing an insulation model, which distinguishes between grounded components and non-grounded components in a hydrogen system; performs insulation resistance detection on each non-grounded component to obtain the insulation resistance of each non-grounded component; performs insulation resistance equivalent processing on each section of a pipeline in the hydrogen system to determine the equivalent insulation resistance of the pipeline; and establishes an insulation model of the hydrogen system based on the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline. In this way, based on the established hydrogen insulation model, the weak insulation areas of the hydrogen system can be clearly reflected, so as to implement insulation improvement measures in a targeted manner; and, through the hydrogen insulation model, the insulation index can be quantified, so as to solve the current difficulties in hydrogen fuel cell insulation risks and unclear indicators, shorten the development time, and have milestone significance for hydrogen fuel cell insulation design.

[0090] Based on the same inventive concept, an embodiment of the present invention further provides an insulation model establishment device, including a distinguishing module, a detecting module, an equivalent module and a model establishment module.

[0091] The distinguishing module is used to distinguish between grounded components and non-grounded components in the hydrogen system;

[0092] The detection module is used to perform insulation resistance detection on each non-grounded component respectively to obtain the insulation resistance of each non-grounded component;

[0093] The equivalent module is used to perform insulation resistance equivalent processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of the pipeline;

[0094] The model building module is used to build an insulation model of the hydrogen system according to the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline.

[0095] Optionally, the grounded components include a hydrogen pump, a hydrogen inlet solenoid valve, a hydrogen medium pressure sensor, and a proportional valve; the non-grounded components include a hydrogen inlet pressure sensor, a fuel cell stack, a hydrogen outlet sensor, a moisture device, a hydrogen discharge valve, and a water discharge valve.

[0096] In an optional implementation, the equivalent module is further used for:

[0097] For each section of pipeline, determine the medium in the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline;

[0098] According to the medium in the pipeline, the conductivity of the pipeline is obtained;

[0099] Determine the equivalent insulation resistance of the pipeline based on the electrical conductivity of the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline.

[0100] Optionally, the conduit includes a flow tube and a manifold.

[0101] In an optional implementation, the equivalent module is further used for:

[0102] Determine whether the pipeline is a pipeline before entering the stack;

[0103] If yes, the medium in the pipeline is dry gas;

[0104] If not, the medium in the pipeline is high-humidity gas.

[0105] In an optional implementation, the equivalent module is further used for:

[0106] Determine the equivalent insulation resistance of the pipeline using the following formula:

[0107] R=L / (kσ*S)

[0108] Among them, R is the equivalent insulation resistance of the pipeline, L is the length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the hydrogen anode tail water, and k is the dielectric coefficient.

[0109] Optionally, if the medium is dry gas, k is 0.001; if the medium is high-humidity gas, k is 0.05.

[0110] In summary, the insulation model establishment device provided in the embodiment of this specification distinguishes between grounded components and non-grounded components in the hydrogen system; performs insulation resistance detection on each non-grounded component respectively to obtain the insulation resistance of each non-grounded component; performs insulation resistance equivalent processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of the pipeline; and establishes an insulation model of the hydrogen system based on the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline. In this way, according to the established hydrogen insulation model, the insulation weaknesses of the hydrogen system can be clearly reflected, so as to implement insulation improvement measures in a targeted manner; and the hydrogen insulation model can quantify the insulation index, solve the current difficulties in hydrogen fuel cell insulation risks and unclear indicators, shorten the development time, and is of milestone significance to the insulation design of hydrogen fuel cells.

[0111] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the insulation model building device described above can refer to the corresponding process in the aforementioned method, and will not be described in detail here.

[0112] Based on the above, this embodiment provides a readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the insulation model establishment method of any of the aforementioned embodiments is implemented.

[0113] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the readable storage medium described above can refer to the corresponding process in the aforementioned method, and will not be described in detail here.

[0114] 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 establishing an insulation model, characterized in that: Applicable to a hydrogen system of a hydrogen fuel cell; the method comprises: Distinguish between grounded components and non-grounded components in the hydrogen system; the grounded components include hydrogen pumps, hydrogen inlet solenoid valves, hydrogen medium pressure sensors, and proportional valves; the non-grounded components include hydrogen inlet pressure sensors, fuel cells, hydrogen outlet sensors, moisture devices, hydrogen discharge valves, and water discharge valves; Performing insulation resistance detection on each of the non-grounded components respectively to obtain the insulation resistance of each of the non-grounded components; Perform insulation resistance equivalence processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of each section of the pipeline; Establishing an insulation model of the hydrogen system according to the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline; The step of performing insulation resistance equivalent processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of each section of the pipeline includes: For each section of pipeline, determine the medium in the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline; According to the medium in the pipeline, the conductivity of the pipeline is obtained; Determining the equivalent insulation resistance of the pipeline according to the electrical conductivity of the pipeline, the length of the pipeline, and the cross-sectional area of ​​the pipeline; The equivalent insulation resistance of the pipeline is determined by the following formula: R=L / (kσ*S) Among them, R is the equivalent insulation resistance of the pipeline, L is the length of the pipeline; S is the cross-sectional area of ​​the pipeline; σ is the conductivity of the hydrogen anode tail water, and k is the dielectric coefficient.

2. The method according to claim 1, characterized in that The pipeline includes a flow pipe and a manifold.

3. The method according to claim 1 or 2, characterized in that: The step of determining the medium in the pipeline comprises: Determining whether the pipeline is a pipeline before entering the stack; If yes, the medium in the pipeline is dry gas; If not, the medium in the pipeline is high-humidity gas.

4. The method according to claim 1, characterized in that: If the medium is dry gas, k is taken as 0.

001.

5. The method according to claim 1, characterized in that: If the medium is a high-humidity gas, k is set to 0.

05.

6. An insulation model building device, characterized in that: Using the insulation model establishment method according to any one of claims 1 to 5; the device comprises: A distinguishing module is used to distinguish between grounded components and non-grounded components in the hydrogen system; the grounded components include a hydrogen pump, a hydrogen inlet solenoid valve, a hydrogen medium pressure sensor, and a proportional valve; the non-grounded components include a hydrogen inlet pressure sensor, a fuel cell, a hydrogen outlet sensor, a moisture device, a hydrogen discharge valve, and a water discharge valve; A detection module, used to perform insulation resistance detection on each of the non-grounded components to obtain the insulation resistance of each of the non-grounded components; The equivalent module is used to perform insulation resistance equivalent processing on each section of the pipeline in the hydrogen system to determine the equivalent insulation resistance of each section of the pipeline; The model building module is used to build an insulation model of the hydrogen system according to the insulation resistance of each non-grounded component and the equivalent insulation resistance of each section of the pipeline.

7. 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 model establishment method described in any one of claims 1 to 5 when executing the computer program.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the program is executed by a processor, the insulation model establishment method according to any one of claims 1 to 5 is implemented.

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