Method for measuring residual hydrogen amount of solid hydrogen storage

Abstract

This invention discloses a method for measuring the remaining hydrogen content in solid-state hydrogen storage, belonging to the field of solid-state hydrogen storage technology. The method includes calculating a first hydrogen consumption based on the specific power and voltage of the fuel cell stack; calculating a second hydrogen consumption based on the diameter and duty cycle of the exhaust valve, as well as pre-acquired ambient temperature and pressure; and finally calculating a first remaining hydrogen content based on the total hydrogen weight, the first hydrogen consumption, and the second hydrogen consumption. This invention calculates the hydrogen consumption at the hydrogen tail exhaust more accurately by using the parameters of the exhaust valve and environmental parameters, thereby obtaining a more accurate first remaining hydrogen content and achieving more precise remaining hydrogen content calibration. Furthermore, this invention obtains the second remaining hydrogen content based on the hydrogen pressure value and the pre-acquired hydrogen storage mass density of the hydrogen storage module, and uses the second remaining hydrogen content to calibrate the first remaining hydrogen content, thereby further improving the accuracy of remaining hydrogen content calibration.

Description

Technical Field

[0001] This application relates to the field of solid-state hydrogen storage technology, specifically to a method for measuring the remaining hydrogen content in solid-state hydrogen storage. Background Technology

[0002] Hydrogen storage technologies are mainly divided into material-based hydrogen storage and physical hydrogen storage, with physical hydrogen storage including gaseous and liquid hydrogen storage. Gaseous hydrogen storage, due to its advantages such as fast hydrogen charging and discharging rates, low energy consumption, low cost, and mature technology, has become the most commercially viable hydrogen storage technology. Solid-state hydrogen storage technology, due to its advantages such as high volumetric hydrogen storage density, good safety, no need for high-pressure containers, and the ability to improve hydrogen purity, is considered one of the best hydrogen storage methods for off-grid power generation in conjunction with renewable energy sources. However, in existing technologies, the calculation of the remaining hydrogen content in solid-state hydrogen storage is always inaccurate, making it impossible to know the remaining hydrogen content during application, leading to user complaints. Furthermore, directly charging unused solid-state hydrogen storage systems poses safety risks.

[0003] Currently, the estimation algorithm for the remaining hydrogen capacity of solid-state hydrogen storage systems mainly involves subtracting the hydrogen consumption after hydrogen-to-electric conversion from the initial weight and the hydrogen emission estimated by empirical models (or simply ignoring it). This leads to significant deviations in the calculation of remaining hydrogen capacity, and there is also a lack of calibration methods for the remaining hydrogen capacity during system operation.

[0004] Please refer to patent document CN 106052791 A, which discloses a method for measuring the remaining hydrogen volume in a solid-state hydrogen storage device. The method includes: injecting hydrogen into a fixed-volume container and measuring the pressure and temperature of the hydrogen; performing pressure and temperature correction on the hydrogen in the fixed-volume container to obtain the hydrogen volume under standard conditions; a data processing controller accumulating the amount of hydrogen emitted each time and comparing it with the initial hydrogen storage capacity of the solid-state hydrogen storage device to obtain the remaining hydrogen volume; and displaying the remaining hydrogen volume in the solid-state hydrogen storage device. The device for measuring the remaining hydrogen volume in a solid-state hydrogen storage device consists of a solid-state hydrogen storage device, a pressure reducer, pressure and temperature sensors, a solenoid valve, a fixed-volume container, a data processing controller, and a display.

[0005] Patent document CN 118117126 A discloses a device, method, computer-readable storage medium, and product for estimating the remaining hydrogen quantity of a fuel cell system based on solid-state hydrogen storage. The device includes: a solid-state hydrogen storage cylinder, a fuel cell stack, an electronic load, an ammeter, a current integration module, and a fuel cell controller. The solid-state hydrogen storage cylinder stores hydrogen in a solid material. The outlet of the solid-state hydrogen storage cylinder is connected to the hydrogen inlet of the fuel cell stack. The hydrogen outlet of the fuel cell stack is connected to the electronic load. The ammeter is connected to the electronic load, the current integration module, and the fuel cell stack, respectively. The ammeter is used to collect the current of the electronic load, and the current integration module is used to integrate the current. The fuel cell controller is connected to the current integration module and is used to calculate the remaining hydrogen quantity of the fuel cell system based on the current integration. This invention enables users and maintenance personnel to monitor the remaining hydrogen quantity of the fuel cell system in real time.

[0006] Patent document CN 118376926A discloses a method for estimating the remaining power percentage of a solid-state hydrogen storage fuel cell. This method involves recording operating data from the equipment after the solid-state hydrogen storage fuel cell is fully charged and operating under rated conditions. The output power is calculated based on the fuel cell's output voltage and current, and then summed to obtain the "rated output power" of the solid-state hydrogen storage fuel cell. During actual operation, the "cumulative output power" is calculated in real time using the formula: Remaining power percentage of the solid-state hydrogen storage fuel cell = 1 - Cumulative output power / Rated output power. The operating data recorded by the equipment during rated operation is used to indicate the remaining power of the equipment, reminding operators to refuel with hydrogen in a timely manner.

[0007] In the aforementioned existing technologies, the primary focus is on calculating the initial hydrogen storage capacity of solid-state hydrogen storage. The calculation of the remaining hydrogen capacity during operation mainly focuses on hydrogen consumption during the hydrogen-to-electricity conversion process, neglecting the estimation of hydrogen emissions. This leads to inaccuracies in the accuracy of remaining hydrogen capacity measurements. Furthermore, the measurement devices only measure the initial state, lacking calibration devices for hydrogen quantity measurements during operation. This also prevents the calibration and optimization of the remaining hydrogen capacity testing model. Therefore, current technologies cannot accurately display the remaining hydrogen capacity of solid-state hydrogen storage systems. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for measuring the remaining hydrogen in solid-state hydrogen storage. The aim is to obtain a more accurate amount of remaining hydrogen by more accurately calculating the hydrogen consumption in hydrogen tail gas emissions.

[0009] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0010] This invention provides a method for measuring the remaining hydrogen content in solid-state hydrogen storage. The method is applicable to fuel cell vehicle systems, which include hydrogen storage modules and fuel cell stacks.

[0011] The hydrogen storage module is connected to the fuel cell stack and is used to supply hydrogen; the anode chamber of the fuel cell stack is provided with an exhaust port for exhaust gas purging, and the exhaust port is provided with an exhaust valve.

[0012] The method for measuring the remaining hydrogen content in solid-state hydrogen storage includes the following steps:

[0013] Obtain the total weight of hydrogen in the hydrogen storage module when it is fully filled;

[0014] The specific power and voltage of the fuel cell stack during the electrochemical reaction are collected, and the first hydrogen consumption is calculated based on the specific power and voltage of the fuel cell stack.

[0015] The second hydrogen consumption is calculated based on the diameter and duty cycle of the exhaust valve, as well as the pre-obtained ambient temperature and pressure.

[0016] The first remaining hydrogen quantity is calculated based on the total weight of hydrogen, the first hydrogen consumption, and the second hydrogen consumption.

[0017] The second remaining hydrogen quantity is calculated based on the hydrogen pressure value of the hydrogen storage module and the pre-obtained hydrogen storage mass density of the hydrogen storage module.

[0018] The first remaining hydrogen quantity is calibrated based on the second remaining hydrogen quantity, and the calibrated first remaining hydrogen quantity is output as the final measurement result.

[0019] Further, the first remaining hydrogen quantity is calculated based on the total weight of hydrogen, the first hydrogen consumption, and the second hydrogen consumption. It is expressed by the following formula:

[0020] ;

[0021] In the formula, This indicates the total weight of hydrogen in the hydrogen storage module when it is fully filled. This indicates the first hydrogen consumption. This indicates the second hydrogen consumption.

[0022] Furthermore, the second hydrogen consumption The calculation formula is as follows:

[0023] ;

[0024] In the formula, Indicates the theoretical hydrogen emission; This indicates the correction factor for the exhaust valve diameter; This indicates the duty cycle controlled by the hydrogen discharge valve; This represents the dynamic environmental compensation coefficient, which is calculated based on ambient temperature and ambient pressure. This indicates the system uptime.

[0025] Furthermore, the exhaust valve diameter correction factor This can be expressed by the following formula:

[0026] ;

[0027] In the formula, and All of these represent correction factors. Indicates the diameter of the exhaust valve.

[0028] Furthermore, the dynamic environmental compensation coefficient The calculation formula is as follows:

[0029] ;

[0030] In the formula, This represents atmospheric pressure under actual environmental conditions. Indicates atmospheric pressure under standard conditions; Indicates the actual ambient temperature; Indicates ambient temperature under standard conditions; Indicates the molar mass of ambient gases; This represents the environmental gas constant.

[0031] Furthermore, the theoretical hydrogen emission... It was obtained through calculations using a one-dimensional simulation model of the fuel cell stack.

[0032] Furthermore, the total weight of the hydrogen gas The calculation method is as follows: the mass of the hydrogen storage module after it is filled with hydrogen is subtracted from the original weight of the hydrogen storage module.

[0033] Furthermore, the hydrogen pressure value of the hydrogen storage module is the hydrogen pressure value detected when the temperature of the hydrogen storage module is at a set temperature.

[0034] Furthermore, the hydrogen storage module is connected to an antifreeze circulation system, which includes a PTC heater for heating the antifreeze and a circulation pump for driving the antifreeze circulation flow.

[0035] The PTC heater works in conjunction with the circulating pump to keep the temperature of the hydrogen storage module at a set temperature.

[0036] Further, the step of calculating the second remaining hydrogen quantity based on the hydrogen pressure value of the hydrogen storage module and the pre-obtained hydrogen storage mass density of the hydrogen storage module includes:

[0037] Based on the properties of the hydrogen storage material in the hydrogen storage module, obtain the pressure-concentration-temperature curve of the hydrogen storage material at a set temperature;

[0038] Based on the pressure-concentration-temperature curve and hydrogen pressure value, the hydrogen storage mass density of the hydrogen storage module is obtained;

[0039] The second remaining hydrogen quantity is calculated based on the hydrogen storage mass density and the total mass of the hydrogen storage material.

[0040] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0041] This invention provides a method for measuring the remaining hydrogen content in solid-state hydrogen storage. The method calculates a first hydrogen consumption based on the stack's specific power and voltage. A second hydrogen consumption is calculated based on the exhaust valve's diameter and duty cycle, as well as pre-obtained ambient temperature and pressure. Finally, the first remaining hydrogen content is calculated based on the total hydrogen weight, the first hydrogen consumption, and the second hydrogen consumption. This invention, by combining exhaust valve parameters and environmental parameters, more accurately calculates the hydrogen consumption at the tailpipe, thereby obtaining a more accurate first remaining hydrogen content and achieving a more precise calibration of the remaining hydrogen content.

[0042] The present invention also obtains a second remaining hydrogen quantity based on the hydrogen pressure value and the pre-obtained hydrogen storage mass density of the hydrogen storage module, and calibrates the first remaining hydrogen quantity using the second remaining hydrogen quantity, thereby enabling appropriate correction of the calculation model and further improving the accuracy of the remaining hydrogen quantity calibration. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the calibration device provided in an embodiment of the present invention;

[0044] Figure 2 This is a PCT curve of the solid hydrogen storage material provided in the embodiments of the present invention;

[0045] Figure 3 yes Figure 2 A schematic diagram of the hydrogen desorption curve in the plateau region of the PCT curve;

[0046] Figure 4 This is a schematic diagram of the internal architecture of the calibration device provided in an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the algorithm flow for measuring the remaining hydrogen content in solid-state hydrogen storage provided by this invention.

[0048] In the diagram: 1. Calibration device body; 2. Display screen; 3. Pressure gauge; 4. Hydrogen storage module; 5. Antifreeze outlet pipe; 6. Hydrogen pressure detection pipe; 7. Antifreeze inlet pipe. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Example 1

[0053] This embodiment introduces a method for measuring the remaining hydrogen content in solid-state hydrogen storage. The method for measuring the remaining hydrogen content in solid-state hydrogen storage is applicable to fuel cell vehicle systems, which include a hydrogen storage module 4 and a fuel cell stack.

[0054] The hydrogen storage module 4 is connected to the fuel cell stack and is used to supply hydrogen. The hydrogen storage module 4 is connected to a hydrogen pressure sensor through a pipeline. The hydrogen pressure sensor is used to obtain the hydrogen pressure value of the hydrogen storage module 4. The anode chamber of the fuel cell stack is provided with an exhaust port for exhaust gas purging. The exhaust port is equipped with an exhaust valve.

[0055] Please see Figure 5Methods for measuring the remaining hydrogen content in solid-state hydrogen storage include:

[0056] S100, Obtain the remaining hydrogen quantity in solid-state hydrogen storage:

[0057] Initial storage capacity measurement: The total weight of hydrogen is obtained by subtracting the original weight of hydrogen storage module 4 from the weight of hydrogen storage module 4 after it is filled with hydrogen. ;

[0058] The specific power, voltage, and total current of the fuel cell stack during the electrochemical reaction are obtained through the FCU (Fuel Cell Vehicle Controller), and the first hydrogen consumption is calculated based on these parameters. .

[0059] Specifically, the FCU first calculates the corresponding first hydrogen consumption based on the collected voltage and current using a real-time integration method. This computational model is based on the electrochemical principles of fuel cells and includes the following steps:

[0060] Real-time data acquisition: The total current of the fuel cell stack is acquired in real time via the FCU. ;

[0061] Integral calculation: during the control cycle Integrating the current, we obtain the accumulated charge. :

[0062] ;

[0063] Determining voltage efficiency by consulting graphs / modeling Voltage efficiency Depending on the current operating point, i.e., the current density (related to specific power) and the stack voltage, it is usually obtained by looking up a table or fitting a formula from the stack polarization curve characteristic diagram (MAP).

[0064] Hydrogen utilization rate Determined by the BOP (Band of Operators) control strategy, it is usually a function of current density and purging strategy.

[0065] Based on the number of grams of hydrogen consumed per ampere-hour (Ah) of current... Then we have the following formula:

[0066] .

[0067] The second hydrogen consumption is calculated based on the exhaust valve's diameter and duty cycle, as well as the pre-obtained ambient temperature and pressure. .

[0068] Specifically, in this embodiment, the second hydrogen consumption The calculation method requires consideration of the exhaust valve's diameter ( The control strategy for the exhaust valve is the valve's duty cycle (d), and the ambient temperature ( ) and environmental pressures ( Thus, the second hydrogen consumption was obtained. The calculation formula is as follows:

[0069] ;

[0070] In the formula, Indicates the theoretical hydrogen emission; This indicates the correction factor for the exhaust valve diameter; This indicates the duty cycle controlled by the hydrogen discharge valve; This represents the dynamic environmental compensation coefficient, which is calculated based on ambient temperature and ambient pressure. This indicates the system uptime.

[0071] By conducting performance tests on the exhaust valves and correcting their diameters using gases at different temperatures and pressures, the diameter correction coefficients for all exhaust valves in the system were obtained. for:

[0072] ;

[0073] In the formula, and All of these represent correction factors.

[0074] Optimization of the algorithm model for hydrogen emission, dynamic environmental compensation coefficient It is a dynamic environmental compensation coefficient used to consider the impact of ambient temperature and pressure on hydrogen emissions. The calculation formula is as follows:

[0075] ;

[0076] In the formula, This represents atmospheric pressure under actual environmental conditions. Indicates atmospheric pressure under standard conditions; Indicates the actual ambient temperature; Indicates ambient temperature under standard conditions; Indicates the molar mass of ambient gases; This represents the environmental gas constant.

[0077] The first remaining hydrogen quantity is calculated based on the total weight of hydrogen, the first hydrogen consumption, and the second hydrogen consumption. It can be expressed by the following formula:

[0078] .

[0079] For example, data verification was performed based on the above algorithm model: the initial hydrogen storage capacity was 1.5 kg, the hydrogen consumption for hydrogen-to-electricity conversion was 0.25 kg, and the theoretical hydrogen emissions under different operating conditions are shown in Table 1 below:

[0080] Table 1: Theoretical hydrogen emissions under different operating conditions

[0081]

[0082] The total hydrogen emission was calibrated using parameters. The exhaust valve diameter is 1.5 mm. After testing and calibration, its a value is 0.1247 and b value is 0.932. Therefore, the exhaust valve diameter correction factor is:

[0083] ;

[0084] Assuming the test day is under standard operating conditions, i.e. =1, then the second hydrogen consumption The actual hydrogen emissions are calculated as follows:

[0085] ;

[0086] Thus, the first remaining hydrogen quantity is obtained. for:

[0087] .

[0088] S200, Calibration of Remaining Hydrogen Quantity:

[0089] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, by setting up a calibration device and controlling the temperature of the hydrogen storage module 4, the internal pressure of the hydrogen storage module 4 is detected. The calibration device includes a calibration device body 1, which is equipped with a display screen 2 for displaying the second remaining hydrogen quantity. The calibration device body 1 is equipped with a hydrogen pressure detection pipeline 6, which is connected to a pressure gauge 3 via a hydrogen gas connector. The pressure gauge 3 obtains the hydrogen pressure value through a hydrogen pressure sensor. The hydrogen storage module 4 is temperature-controlled by heat exchange with antifreeze. The hydrogen storage module 4 has an antifreeze outlet and an antifreeze inlet. The antifreeze outlet is connected in sequence to a PTC heater, a water pump, an antifreeze inlet pipeline 7, and an antifreeze inlet via an antifreeze water outlet pipeline 5. A temperature sensor for detecting the inlet temperature is installed at the antifreeze inlet. In this embodiment, the PTC heater is a PTC heating element composed of a PTC ceramic (positive temperature coefficient thermistor ceramic) heating element and an aluminum tube.

[0090] The PTC heater, temperature sensor, and water pump are connected to the controller. The controller controls the PTC heater and water pump based on the inlet temperature detected by the temperature sensor to ensure the inlet temperature reaches the set temperature. The antifreeze inlet line 7 and antifreeze outlet line 5 maintain the temperature of the hydrogen storage module at the set temperature. At this time, the hydrogen pressure value inside the hydrogen storage module 4 is obtained from the hydrogen pressure detection line 6 and pressure gauge 3. The PCT curve is a curve that describes the relationship between the equilibrium pressure of hydrogen and the hydrogen content in a hydrogen storage material at a constant temperature. This is the equilibrium pressure of hydrogen gas, usually expressed on a logarithmic scale. The hydrogen content in a material can be expressed as its hydrogen storage density. ( ), This indicates the constant temperature maintained during the measurement. Please refer to [link / reference]. Figure 2 Based on the hydrogen storage properties of the hydrogen storage material inside hydrogen storage module 4, the pressure-concentration-temperature (PCT) curve of the hydrogen storage material at a set temperature is obtained. The nearly horizontal region in the middle of the curve (the selected area) is the plateau region, where metal solid solutions and metal hydrides coexist. With the addition of hydrogen, the metal solid solution continuously transforms into metal hydrides, but the system pressure remains essentially constant. Please refer to [link / reference]. Figure 3 The PCT curve is the hydrogen pressure curve in the plateau region. With hydrogen storage mass density ( The result is obtained by fitting. ( )about The graph of a linear function is obtained. Based on the PCT curve and the detected hydrogen pressure value, the hydrogen storage mass density of the hydrogen storage module is obtained; based on the hydrogen storage mass density and the total mass of the hydrogen storage material, the second remaining hydrogen quantity is calculated.

[0091] like Figure 1 As shown, the hydrogen storage capacity is displayed in real time on the display screen 2 of the calibration device body 1. And through calibration, that is, determining whether m equals... If m and If they are not equal, then the correction factor for the vent valve diameter in the algorithm for the remaining hydrogen quantity in the solid-state hydrogen storage system is applied. and dynamic environmental compensation coefficient Optimization is performed. The schematic diagram of the internal system of the calibration device is shown below. Figure 4 As shown.

[0092] Specifically, the optimization process includes:

[0093] For compensation coefficient Calibration involves placing the calibration system in a pre-set environmental chamber for testing to obtain accurate results. , .

[0094] Adjusting the correction factor In , Correction factor, making It then obtains the first remaining hydrogen quantity after calibration and outputs it as the final measurement result.

[0095] Example 2

[0096] This embodiment provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described in Embodiment 1.

[0097] Example 3

[0098] This embodiment provides a computer device, including:

[0099] Memory, used to store computer programs / instructions;

[0100] A processor for executing the computer program / instructions to implement the steps of any of the methods described in Embodiment 1.

[0101] Example 4

[0102] This embodiment provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps of any of the methods described in Embodiment 1.

[0103] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0104] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0105] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0106] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0107] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit its protection scope. Although this disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this disclosure, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims.

Claims

1. A method for measuring the remaining hydrogen content in solid-state hydrogen storage, characterized in that, The method for measuring the remaining hydrogen content in solid-state hydrogen storage is applicable to fuel cell vehicle systems, which include hydrogen storage modules and fuel cell stacks. The hydrogen storage module is connected to the fuel cell stack and is used to supply hydrogen; the anode chamber of the fuel cell stack is provided with an exhaust port for exhaust gas purging, and the exhaust port is provided with an exhaust valve. The method for measuring the remaining hydrogen content in solid-state hydrogen storage includes the following steps: Obtain the total weight of hydrogen in the hydrogen storage module when it is fully filled; The specific power, voltage, and total current of the fuel cell stack during the electrochemical reaction are collected, and the first hydrogen consumption is calculated based on the specific power, voltage, and total current of the fuel cell stack. The second hydrogen consumption is calculated based on the diameter and duty cycle of the exhaust valve, as well as the pre-obtained ambient temperature and pressure. The first remaining hydrogen quantity is calculated based on the total weight of hydrogen, the first hydrogen consumption, and the second hydrogen consumption. The second remaining hydrogen quantity is calculated based on the hydrogen pressure value of the hydrogen storage module and the pre-obtained hydrogen storage mass density of the hydrogen storage module. The first remaining hydrogen quantity is calibrated based on the second remaining hydrogen quantity, and the calibrated first remaining hydrogen quantity is output as the final measurement result. The first remaining hydrogen quantity is calculated based on the total weight of hydrogen, the first hydrogen consumption, and the second hydrogen consumption. It is expressed by the following formula: ； In the formula, This indicates the total weight of hydrogen in the hydrogen storage module when it is fully filled. This indicates the first hydrogen consumption. This indicates the second hydrogen consumption; the second hydrogen consumption The calculation formula is as follows: ； In the formula, Indicates the theoretical hydrogen emission; This indicates the correction factor for the exhaust valve diameter; This indicates the duty cycle controlled by the hydrogen discharge valve; This represents the dynamic environmental compensation coefficient, which is calculated based on ambient temperature and ambient pressure. Indicates system uptime; the exhaust valve diameter correction factor. This can be expressed by the following formula: ； In the formula, and All of these represent correction factors. Indicates the exhaust valve diameter; the dynamic environmental compensation coefficient The calculation formula is as follows: ； In the formula, This represents atmospheric pressure under actual environmental conditions. Indicates atmospheric pressure under standard conditions; Indicates the actual ambient temperature; Indicates ambient temperature under standard conditions; Indicates the molar mass of ambient gases; Represents the ambient gas constant; The calibration includes: determining whether the first remaining hydrogen quantity m is equal to the second remaining hydrogen quantity. If m and If they are not equal, then the correction factor for the exhaust valve diameter is applied. and dynamic environmental compensation coefficient Optimize; Specifically, the optimization process includes: For compensation coefficient Calibration is performed by placing the calibration system in a pre-set environmental chamber for testing to obtain accurate results. , ; Adjusting the correction factor In , Correction factor, making It also obtains the first remaining hydrogen quantity after calibration and outputs it as the final measurement result.

2. The method for measuring the remaining hydrogen content in solid-state hydrogen storage according to claim 1, characterized in that, The theoretical hydrogen emission It was obtained through calculations using a one-dimensional simulation model of the fuel cell stack.

3. The method for measuring the remaining hydrogen content in solid-state hydrogen storage according to claim 1, characterized in that, The total weight of hydrogen The calculation method is as follows: the mass of the hydrogen storage module after it is filled with hydrogen is subtracted from the original weight of the hydrogen storage module.

4. The method for measuring the remaining hydrogen content in solid-state hydrogen storage according to claim 1, characterized in that, The hydrogen pressure value of the hydrogen storage module is the hydrogen pressure value detected when the temperature of the hydrogen storage module is at a set temperature.

5. The method for measuring the remaining hydrogen content in solid-state hydrogen storage according to claim 4, characterized in that, The hydrogen storage module is connected to an antifreeze circulation system, which includes a PTC heater for heating the antifreeze and a circulation pump for driving the antifreeze circulation flow. The PTC heater works in conjunction with the circulating pump to keep the temperature of the hydrogen storage module at a set temperature.

6. The method for measuring the remaining hydrogen content in solid-state hydrogen storage according to claim 5, characterized in that, The step of calculating the second remaining hydrogen quantity based on the hydrogen pressure value of the hydrogen storage module and the pre-obtained hydrogen storage mass density of the hydrogen storage module includes: Based on the properties of the hydrogen storage material in the hydrogen storage module, obtain the pressure-concentration-temperature curve of the hydrogen storage material at a set temperature; Based on the pressure-concentration-temperature curve and hydrogen pressure value, the hydrogen storage mass density of the hydrogen storage module is obtained; The second remaining hydrogen quantity is calculated based on the hydrogen storage mass density and the total mass of the hydrogen storage material.

Images