A hydrogen supply device for a fuel cell with multiple hydrogen supply ports and a control method

Abstract

This invention discloses a multi-port fuel cell hydrogen supply device, comprising a first hydrogen refueling port and a second hydrogen refueling port. The first hydrogen refueling port is connected to the inlet pipe of a first hydrogen cylinder group via a first hydrogen refueling valve, and the second hydrogen refueling port is connected to the inlet pipe of a second hydrogen cylinder group via a second hydrogen refueling valve. A cylinder group connection valve is connected between the inlet pipes of the first and second hydrogen cylinder groups. The outlet pipes of the first and second hydrogen cylinder groups are sequentially connected to a pressure reducing valve and a hydrogen supply valve. A parallel hydrogen supply valve is connected between the outlet pipes of the first and second hydrogen cylinder groups, and / or each hydrogen cylinder in the first and second hydrogen cylinder groups has a cylinder outlet valve. This device enables rapid hydrogen refueling of the hydrogen cylinder groups, meets hydrogen supply requirements of different pressure specifications, flexibly controls independent / parallel hydrogen refueling / supply operations of the cylinder groups, and provides hydrogen supply while simultaneously replenishing the cylinder groups with external hydrogen.

Description

Technical Field

[0001] This invention relates to a fuel cell hydrogen supply device and control method, and more particularly to a fuel cell hydrogen supply device and control method with multiple hydrogen refueling ports. Background Technology

[0002] The function of a fuel cell hydrogen supply unit is to store high-pressure hydrogen and provide a suitable hydrogen supply according to the fuel pressure requirements of the hydrogen fuel cell system. It is an essential component for hydrogen fuel cells in applications such as automobiles, ships, and rail transportation. Currently, most fuel cell hydrogen supply units consist of hydrogen cylinder groups composed of multiple hydrogen cylinders connected in parallel. Each end of the hydrogen cylinder group has a hydrogen filling port and an output pressure regulating pipeline with pressure reducing valves, hydrogen supply valves, etc. Although the structure is simple and has basic functions of hydrogen filling, storage, and supply, it cannot fully meet the actual needs in some special situations. For example, in high-power ship applications, on the one hand, the fuel cell systems used on ships have high power, often with multiple hydrogen fuel cell systems operating in parallel. This requires not only a large hydrogen storage capacity but also multiple hydrogen supply lines with different pressure specifications. The aforementioned hydrogen supply units not only have long hydrogen filling times but also cannot meet the needs of multiple different pressure specifications. On the other hand, due to the large number of electrical devices on ships and their complex operating conditions, some operating conditions require continuous hydrogen supply from the hydrogen supply unit. During the hydrogen supply process, adding hydrogen can cause impacts on the hydrogen cylinders, thus affecting the quality of the supply. Therefore, the aforementioned hydrogen supply units cannot meet the requirements of partial hydrogen supply and partial hydrogen filling. In addition, in some applications of fuel cell vehicles or ships, it is necessary for one fuel cell vehicle or ship to provide reverse hydrogen refueling to multiple other fuel cell vehicles or ships through a hydrogen refueling port. The aforementioned hydrogen supply device can only provide reverse hydrogen refueling through one hydrogen refueling port, and cannot meet the requirement of simultaneously providing reverse hydrogen refueling to multiple fuel cell vehicles or ships.

[0003] Chinese patent application No. 202211647233.1 discloses a hydrogen storage device and vehicle. Its basic structure comprises multiple hydrogen refueling ports, multiple hydrogen tanks, and a hydrogen supply path flowing from the refueling ports to the hydrogen tanks. The path has a confluence point downstream of the multiple refueling ports, from which hydrogen is supplied to the branches of the multiple hydrogen tanks. That is, hydrogen added from multiple refueling ports balances the pressure through the confluence point and simultaneously supplies hydrogen to the branches of the multiple hydrogen tanks, solving the problem of slow hydrogen supply from a single refueling port. However, because the confluence point is connected to the branches of the multiple hydrogen tanks, it still cannot meet the requirements of supplying hydrogen at multiple pressures and partially supplying and refueling hydrogen from the hydrogen tanks. Furthermore, the specific embodiment disclosed in this patent application involves setting check valves 24c and 25f on different flow paths, allowing hydrogen to flow from the refueling port towards the confluence point while restricting its reverse flow (see specification (0042, 0046)). Therefore, this patent application technology also cannot meet the requirements of external reverse hydrogen supply. Summary of the Invention

[0004] This invention aims to solve the aforementioned technical problems existing in the prior art by providing a fuel cell hydrogen supply device and control method with multiple hydrogen refueling ports.

[0005] The technical solution of the present invention is: a fuel cell hydrogen supply device with multiple hydrogen refueling ports, having a first hydrogen refueling port and a second hydrogen refueling port. The first hydrogen refueling port is connected to the inlet pipe of a first hydrogen cylinder group through a first hydrogen refueling valve, and the second hydrogen refueling port is connected to the inlet pipe of a second hydrogen cylinder group through a second hydrogen refueling valve. A cylinder group connection valve is connected between the inlet pipe of the first hydrogen cylinder group and the inlet pipe of the second hydrogen cylinder group. The outlet pipe of the first hydrogen cylinder group and the outlet pipe of the second hydrogen cylinder group are sequentially connected to a pressure reducing valve and a hydrogen supply valve. A parallel hydrogen supply valve is connected between the outlet pipe of the first hydrogen cylinder group and the outlet pipe of the second hydrogen cylinder group, and / or each hydrogen cylinder of the first hydrogen cylinder group and the second hydrogen cylinder group has a cylinder valve at its cylinder opening.

[0006] Preferably, there are two pressure reducing valves and two hydrogen supply valves, which are respectively connected to the outlet pipes of the first hydrogen cylinder group and the second hydrogen cylinder group.

[0007] The inlet pipes of the first and second hydrogen cylinder groups are respectively equipped with pressure sensors for the first and second hydrogen cylinder groups. Both the first and second hydrogen filling ports are equipped with hydrogen concentration sensors and hydrogen filling gun insertion sensors. A controller is provided, and the pressure sensors for the first and second hydrogen cylinder groups, the hydrogen concentration sensors, and the hydrogen filling gun insertion sensors are connected to the input terminal of the controller. The first hydrogen filling valve, the second hydrogen filling valve, the cylinder group connection valve, the hydrogen supply valve, and the parallel hydrogen supply valve and / or the cylinder port valve are connected to the output terminal of the controller.

[0008] A control method for a multi-hydrogen-filling fuel cell hydrogen supply device is performed according to the following steps:

[0009] Step 1. Start

[0010] After inserting the external hydrogen refueling gun or reverse hydrogen refueling gun into the first hydrogen refueling port and / or the second hydrogen refueling port, manually input the hydrogen refueling or reverse hydrogen refueling command signal to the controller;

[0011] Step 2. Connection Detection

[0012] The controller records the signal from the sensor inserted by the hydrogen refueling gun as the first hydrogen refueling port or / and the second hydrogen refueling port, and performs step 3 or step 5 according to the hydrogen refueling or reverse hydrogen replenishment command signal respectively.

[0013] Step 3. Hydrogenation Start-up Detection

[0014] Step 3.1 Check whether the hydrogen cylinder group connected to the hydrogen filling port determined in Step 2 is in hydrogen supply state. If no, proceed to Step 4. If yes, proceed to Step 3.2.

[0015] Step 3.2 The controller alarms to indicate an operation conflict and returns to Step 1;

[0016] Step 4. Hydrogenation and real-time monitoring

[0017] Step 4.1 Close the bottle group connection valve, the parallel hydrogen supply valve or the bottle mouth valve of the corresponding hydrogen bottle group, and open the hydrogenation valve corresponding to the determined hydrogenation port. At the same time, the controller alarms to indicate entering the hydrogenation state;

[0018] Step 4.2 Through the corresponding hydrogen concentration sensor and the corresponding bottle group pressure sensor, real-time monitor the hydrogen concentration m and the pressure P, and calculate the pressure change value ΔP within the unit time interval ΔT in real time. The pressure change value ΔP is the current pressure minus the pressure value before the ΔT time, and the ΔT is 0.1 - 30 seconds; when it is detected that the hydrogen concentration m ≥ M0, or ΔP ≤ ΔPa, or P ≥ Pmax, close the hydrogenation valve and then enter Step 7, where M0 is the preset upper limit of leaked hydrogen, ΔPa is the preset lower limit of hydrogenation rate, and Pmax is the maximum pressure of the hydrogen bottle group;

[0019] Step 5. Reverse hydrogen supplementation start detection

[0020] Detect the pressure value P1 of the pressure sensor of the hydrogen bottle group connected to the hydrogenation port recorded in Step 2. If the pressure value P1 is greater than the preset pressure value P0, proceed to Step 6; otherwise, the controller alarms to indicate low bottle group pressure and returns to Step 1;

[0021] Step 6. Reverse hydrogen supplementation and real-time monitoring

[0022] Open the hydrogenation valve corresponding to the determined hydrogenation port. Through the corresponding hydrogen concentration sensor and the corresponding bottle group pressure sensor, real-time monitor the hydrogen concentration m and the pressure P, and calculate the pressure change value ΔP within the unit time interval ΔT in real time. The pressure change value ΔP is the current pressure minus the pressure value before the ΔT time, and the ΔT is 0.1 - 30 seconds; when it is detected that the hydrogen concentration m ≥ M0, or ΔP > 0, or |ΔP| ≤ ΔPb, or P < P0, close the corresponding hydrogenation valve or the corresponding bottle mouth valve and then enter Step 7, where M0 is the preset upper limit of leaked hydrogen, and ΔPb is the preset lower limit of reverse hydrogen supplementation rate;

[0023] Step 7. According to the controller's prompt, pull out the hydrogenation gun or the reverse hydrogen supplementation gun.

[0024] This invention employs multiple hydrogen filling ports, enabling rapid hydrogen filling of hydrogen cylinder groups and saving filling time. It utilizes multiple gas supply outputs, allowing for different pressure levels to meet varying hydrogen supply requirements. By connecting multiple hydrogen cylinder groups in parallel via cylinder group connection valves, it allows for flexible control of independent / parallel hydrogen filling / supply operations, providing hydrogen supply while simultaneously replenishing the cylinder groups. Furthermore, the inclusion of hydrogen concentration sensors at the filling ports and insertion sensors at the filling nozzles enables real-time monitoring of the filling status, significantly increasing system safety and facilitating automated control. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention. Detailed Implementation Example 1

[0028] A multi-hydrogen-port fuel cell hydrogen supply device according to the present invention, such as Figure 1 As shown, there is a first hydrogen filling port 1 and a second hydrogen filling port 2. The first hydrogen filling port 1 is connected to the inlet pipe 5 of the first hydrogen cylinder group 4 through a first hydrogen filling valve 3. The second hydrogen filling port 2 is connected to the inlet pipe 8 of the second hydrogen cylinder group 7 through a second hydrogen filling valve 6. The first hydrogen cylinder group 4 is composed of two hydrogen cylinders 21 connected in parallel, and the second hydrogen cylinder group 7 is composed of three hydrogen cylinders 21 connected in parallel. A cylinder group connection valve 9 is connected between the inlet pipe 5 of the first hydrogen cylinder group 4 and the inlet pipe 8 of the second hydrogen cylinder group 7. The outlet pipe 10 of the first hydrogen cylinder group 4 and the outlet pipe 11 of the second hydrogen cylinder group 7 are connected to a pressure reducing valve 12 and a hydrogen supply valve 13 in sequence. A parallel hydrogen supply valve 14 is connected between the outlet pipe 10 of the first hydrogen cylinder group 4 and the outlet pipe 11 of the second hydrogen cylinder group 7. The first hydrogen filling valve 3, the second hydrogen filling valve 6, the cylinder group connection valve 9, the hydrogen supply valve 13, and the parallel hydrogen supply valve 14 can all be manual valves or electric valves, and their form is a needle valve, a stop valve, or other valves that can realize hydrogen shut-off. The pressure of pressure reducing valve 12 is 1.5 MPa, and the pressure of each hydrogen cylinder group is 35 MPa.

[0029] When supplying hydrogen, open the hydrogen supply valve 13. By controlling the parallel hydrogen supply valve 14, hydrogen can be supplied to the first hydrogen cylinder group 4 or the first hydrogen cylinder group 4 and the second hydrogen cylinder group 7 can be supplied simultaneously.

[0030] When adding hydrogen, insert the hydrogen gun into the first hydrogen filling port 1 and the second hydrogen filling port 2. If neither the first hydrogen cylinder group 4 nor the second hydrogen cylinder group 7 is supplying hydrogen (at this time, the hydrogen supply valve 13 is closed), open the first hydrogen filling valve 3 and the second hydrogen filling valve 6 to add hydrogen to the first hydrogen cylinder group 4 and the second hydrogen cylinder group 7. If the first hydrogen cylinder group 4 is supplying hydrogen (at this time, the parallel hydrogen supply valve 14 is closed), close the first hydrogen filling valve 3 and the cylinder group connection valve 9, open the second hydrogen filling valve 6, and add hydrogen to the second hydrogen cylinder group 7 through the second hydrogen filling port 2, thus meeting the usage requirements of partial hydrogen cylinder supply and partial hydrogen cylinder addition.

[0031] When reversing hydrogen supply, insert the reverse hydrogen supply gun into the first hydrogen supply port 1 and the second hydrogen supply port 2, close the hydrogen supply valve 13 and the parallel hydrogen supply valve 14, and control the first hydrogen supply valve 3, the second hydrogen supply valve 6 and the bottle group connection valve 9 to achieve reverse hydrogen supply to the outside through the first hydrogen supply port 1 or / and the second hydrogen supply port 2. Example 2

[0032] A multi-hydrogen-port fuel cell hydrogen supply device according to the present invention, such as Figure 2 As shown, similar to Embodiment 1, it has a first hydrogen filling port 1 and a second hydrogen filling port 2. The first hydrogen filling port 1 is connected to the inlet pipe 5 of the first hydrogen cylinder group 4 via a first hydrogen filling valve 3. The second hydrogen filling port 2 is connected to the inlet pipe 8 of the second hydrogen cylinder group 7 via a second hydrogen filling valve 6. The first hydrogen cylinder group 4 consists of two hydrogen cylinders 21 connected in parallel, and the second hydrogen cylinder group 7 consists of three hydrogen cylinders 21 connected in parallel. A cylinder group connection valve 9 connects the inlet pipe 5 of the first hydrogen cylinder group 4 and the inlet pipe 8 of the second hydrogen cylinder group 7. Unlike Embodiment 1, there are two pressure reducing valves 12 and two hydrogen supply valves 13, which are respectively connected to the outlet pipe 10 of the first hydrogen cylinder group 4 and the outlet pipe 11 of the second hydrogen cylinder group 7. A parallel hydrogen supply valve 14 connects the outlet pipe 10 of the first hydrogen cylinder group 4 and the outlet pipe 11 of the second hydrogen cylinder group 7. At the same time, each hydrogen cylinder in the first hydrogen cylinder group 4 and the second hydrogen cylinder group 7 is equipped with a cylinder opening valve 15. The pressure of pressure reducing valve 12 is 1.5 MPa, and the pressure of each hydrogen cylinder group is 35 MPa.

[0033] The inlet pipe 5 of the first hydrogen cylinder group 4 and the inlet pipe 8 of the second hydrogen cylinder group 7 are respectively equipped with a first hydrogen cylinder group pressure sensor 16 and a second hydrogen cylinder group pressure sensor 17. The first hydrogen filling port 1 and the second hydrogen filling port 2 are each equipped with a hydrogen concentration sensor 18 and a hydrogen filling gun insertion sensor 19. The function of the hydrogen filling gun insertion sensor 19 is to detect whether a hydrogen filling gun is connected to the corresponding hydrogen filling port. Its form is a proximity switch, a resistance switch or any other method that can achieve detection. A controller 20 is provided. The first hydrogen cylinder group pressure sensor 16, the second hydrogen cylinder group pressure sensor 17, the hydrogen concentration sensor 18 and the hydrogen filling gun insertion sensor 19 are connected to the input terminal of the controller 20. The first hydrogen filling valve 3, the second hydrogen filling valve 6, the cylinder group connection valve 9, the hydrogen supply valve 13, the parallel hydrogen supply valve 14 and the cylinder opening valve 15 are all electric valves and are connected to the output terminal of the controller 20.

[0034] The multi-hydrogen-port fuel cell hydrogen supply device can provide multiple hydrogen supply methods by controlling the bottle valve 15 and the parallel hydrogen supply valve 14. The control method for needing to add hydrogen or reverse hydrogen replenishment is carried out in the following steps:

[0035] Step 1. Start

[0036] After inserting the external hydrogen refueling gun or the reverse hydrogen refueling gun into the first hydrogen refueling port 1 and the second hydrogen refueling port 2 respectively, manually input the hydrogen refueling or reverse hydrogen refueling command signal to the controller 20.

[0037] Step 2. Connection Detection

[0038] After the controller 20 records the signal from the sensor 19 inserted through the hydrogen refueling gun, it records that it is the first hydrogen refueling port 1 and the second hydrogen refueling port 2, and then performs step 3 or step 5 according to the hydrogen refueling or reverse hydrogen replenishment command signal respectively.

[0039] Step 3. Hydrogenation Start-up Detection

[0040] Step 3.1 Detect whether the first hydrogen cylinder group 4 connected to the first hydrogen filling port 1 is in the hydrogen supply state, that is, detect whether the first hydrogen cylinder group 4 is connected to the open hydrogen supply valve 13. If the detection result is that the first hydrogen cylinder group 4 is in the hydrogen supply state, then proceed to step 3.2, that is, the controller 20 will sound an audible and visual alarm, indicate an operation conflict and return to step 1; detect whether the second hydrogen cylinder group 7 connected to the second hydrogen filling port 2 is in the hydrogen supply state, that is, detect whether the second hydrogen cylinder group 7 is connected to the open hydrogen supply valve 13. If the detection result is that the second hydrogen cylinder group 7 is not in the hydrogen supply state, then proceed to step 4.

[0041] Step 4. Add hydrogen and monitor in real time.

[0042] Step 4.1 Close the bottle group connection valve 9 and the bottle mouth valve 15 of the second hydrogen bottle group 7 and open the second hydrogen filling valve 6. At the same time, the controller 20 alarms to indicate that the hydrogen filling state has been entered.

[0043] Step 4.2: Monitor the hydrogen concentration m and pressure P in real time through the corresponding hydrogen concentration sensor 18 and the second hydrogen cylinder group pressure sensor 17, and calculate the pressure change value ΔP within the unit time interval ΔT in real time. The pressure change value ΔP is the current pressure minus the pressure value before the time of ΔT, and ΔT is 5 seconds. When it is detected that the hydrogen concentration m≥M0, or ΔP≤ΔPa, or P≥Pmax, close the hydrogen addition valve and then enter Step 7, where M0 is the preset upper limit of leaked hydrogen, M0 = 400PPM, ΔPa is the preset lower limit of the hydrogen addition rate, ΔPa = 0.1MPa, and Pmax is the maximum pressure of the hydrogen cylinder group, Pmax = 35MPa;

[0044] Step 5. Reverse hydrogen supply start detection

[0045] Detect the pressure value P1 of the first hydrogen cylinder group pressure sensor 16 connected to the first hydrogen addition port 1 and the second hydrogen cylinder group pressure sensor 17 connected to the second hydrogen addition port 2. As a result, the pressure value P1 of the second hydrogen cylinder group pressure sensor 17 is greater than the preset pressure value P0, P0 = 2MPa, then enter Step 6. If the pressure value P1 of the first hydrogen cylinder group pressure sensor 16 is less than the preset pressure value P0, the controller 20 gives an alarm to indicate that the cylinder group pressure is low and returns to Step 1;

[0046] Step 6. Reverse hydrogen supply and real-time monitoring

[0047] Open the second hydrogen addition valve 6 corresponding to the second hydrogen addition port 2. Monitor the hydrogen concentration m and pressure P in real time through the corresponding hydrogen concentration sensor 18 and the second hydrogen cylinder group pressure sensor 17, and calculate the pressure change value ΔP within the unit time interval ΔT in real time. The pressure change value ΔP is the current pressure minus the pressure value before the time of ΔT, and ΔT is 5 seconds. When it is detected that the hydrogen concentration m≥M0, or ΔP>0, or |ΔP|≤ΔPb, or P<P0, close the second hydrogen addition valve 6 and then enter Step 7, where M0 is the preset upper limit of leaked hydrogen, M0 = 400PPM, and ΔPb is the preset lower limit of the reverse hydrogen supply rate, ΔPb = 0.2MPa;

[0048] Step 7. Pull out the hydrogen addition gun or the reverse hydrogen supply gun according to the prompt of the controller 20. Embodiment 3

[0049] A fuel cell hydrogen supply device with multiple hydrogen addition ports of the present invention is as Figure 3As shown, similar to Embodiment 2, there is a first hydrogen filling port 1 and a second hydrogen filling port 2. The first hydrogen filling port 1 is connected to the inlet pipe 5 of the first hydrogen cylinder group 4 through the first hydrogen filling valve 3. The second hydrogen filling port 2 is connected to the inlet pipe 8 of the second hydrogen cylinder group 7 through the second hydrogen filling valve 6. The first hydrogen cylinder group 4 is composed of two hydrogen cylinders connected in parallel, and the second hydrogen cylinder group 7 is composed of three hydrogen cylinders connected in parallel. A cylinder group connection valve 9 is connected between the inlet pipe 5 of the first hydrogen cylinder group 4 and the inlet pipe 8 of the second hydrogen cylinder group 7. There are two pressure reducing valves 12 and two hydrogen supply valves 13, which are respectively connected to the outlet pipe 10 of the first hydrogen cylinder group 4 and the outlet pipe 11 of the second hydrogen cylinder group 7. At the same time, each hydrogen cylinder of the first hydrogen cylinder group 4 and the second hydrogen cylinder group 7 is equipped with a cylinder opening valve 15. The pressure of the pressure reducing valve 12 is 1.5 MPa, and the pressure of each hydrogen cylinder group is 35 MPa. Unlike Example 2, the inlet pipe 5 and outlet pipe 10 of the first hydrogen cylinder group 4 are combined, and the inlet pipe 8 and outlet pipe 11 of the second hydrogen cylinder group 7 are combined as a common channel for hydrogen supply and refilling, and no parallel hydrogen supply valve 14 is provided.

[0050] The first hydrogen cylinder group 4 and the second hydrogen cylinder group 7 are respectively equipped with a first hydrogen cylinder group pressure sensor 16 and a second hydrogen cylinder group pressure sensor 17 on the inlet pipe 5 and the inlet pipe 8, respectively. The first hydrogen filling port 1 and the second hydrogen filling port 2 are each equipped with a hydrogen concentration sensor 18 and a hydrogen filling gun insertion sensor 19. A controller 20 is provided. The first hydrogen cylinder group pressure sensor 16, the second hydrogen cylinder group pressure sensor 17, the hydrogen concentration sensor 18 and the hydrogen filling gun insertion sensor 19 are connected to the input terminal of the controller 20. The first hydrogen filling valve 3, the second hydrogen filling valve 6, the cylinder group connection valve 9, the hydrogen supply valve 13 and the cylinder opening valve 15 are all electric valves and are connected to the output terminal of the controller 20.

[0051] The multi-port fuel cell hydrogen supply device can control the bottle valve 15 and the bottle group connection valve 9, and provides multiple hydrogen supply methods through the pressure reducing valve 12 and the hydrogen supply valve 13. When hydrogen needs to be added or reversed, the control method is carried out in the following steps:

[0052] Step 1. Start

[0053] After inserting the external hydrogen refueling gun or the reverse hydrogen refueling gun into the first hydrogen refueling port 1 and the second hydrogen refueling port 2 respectively, manually input the hydrogen refueling or reverse hydrogen refueling command signal to the controller 20.

[0054] Step 2. Connection Detection

[0055] After the controller 20 records the signal from the sensor 19 inserted through the hydrogen refueling gun, it records that it is the first hydrogen refueling port 1 and the second hydrogen refueling port 2, and then performs step 3 or step 5 according to the hydrogen refueling or reverse hydrogen replenishment command signal respectively.

[0056] Step 3. Hydrogenation Start-up Detection

[0057] Step 3.1 Detect whether the first hydrogen cylinder group 4 connected to the first hydrogen filling port 1 is in the hydrogen supply state, that is, detect whether the first hydrogen cylinder group 4 is connected to the open hydrogen supply valve 13. If the detection result is that the first hydrogen cylinder group 4 is not in the hydrogen supply state, then proceed to step 4; Detect whether the second hydrogen cylinder group 7 connected to the second hydrogen filling port 2 is in the hydrogen supply state, that is, detect whether the second hydrogen cylinder group 7 is connected to the open hydrogen supply valve 13. If the detection result is that the second hydrogen cylinder group 7 is in the hydrogen supply state, then proceed to step 3.2, that is, the controller 20 sounds and sees an alarm, prompts an operation conflict and returns to step 1;

[0058] Step 4. Add hydrogen and monitor in real time.

[0059] Step 4.1 Close the bottle group connection valve 9 and open the first hydrogen filling valve 3 and the bottle mouth valve 15 of the first hydrogen bottle group 4. At the same time, the controller 20 alarms to indicate that the hydrogen filling state has been entered.

[0060] Step 4.2 Using the corresponding hydrogen concentration sensor 18 and the first hydrogen cylinder group pressure sensor 16, the hydrogen concentration m and pressure P are monitored in real time, and the pressure change value ΔP within a unit time interval ΔT is calculated in real time. The pressure change value ΔP is the current pressure minus the pressure value before ΔT time, where ΔT is 5 seconds. When the hydrogen concentration m ≥ M0, or ΔP ≤ ΔPa, or P ≥ Pmax is detected, the hydrogen filling valve is closed and the process proceeds to step 7. Here, M0 is the preset upper limit of hydrogen leakage, M0 = 400 PPM, ΔPa is the preset lower limit of hydrogen filling rate, ΔPa = 0.1 MPa, and Pmax is the maximum pressure of the hydrogen cylinder group, Pmax = 35 MPa.

[0061] Step 5. Reverse hydrogen replenishment start-up detection

[0062] The pressure values ​​P1 of the first hydrogen cylinder group pressure sensor 16 connected to the first hydrogen filling port 1 and the second hydrogen cylinder group pressure sensor 17 connected to the second hydrogen filling port 2 are detected. If the pressure value P1 of the first hydrogen cylinder group pressure sensor 16 is greater than the preset pressure value P0, P0=2MPa, then proceed to step 6. If the pressure value P1 of the second hydrogen cylinder group pressure sensor 17 is less than the preset pressure value P0, the controller 20 will alarm and indicate that the cylinder group pressure is low and return to step 1.

[0063] Step 6. Reverse hydrogen replenishment and real-time monitoring.

[0064] Open the first hydrogenation valve 3 corresponding to the first hydrogenation port 1 and close the bottle group connection valve 9 and the bottle mouth valve 15 of the second hydrogen bottle group 7. Through the corresponding hydrogen concentration sensor 18 and the first hydrogen bottle group pressure sensor 16, monitor the hydrogen concentration m and pressure P in real time, and calculate the pressure change value ΔP within the unit time interval ΔT in real time. The pressure change value ΔP is the current pressure minus the pressure value before the time of ΔT, and the ΔT is 5 seconds; when it is detected that the hydrogen concentration m≥M0, or ΔP>0, or |ΔP|≤ΔPb, or P<P0, close the first hydrogenation valve 3 and the bottle mouth valve 15 of the first hydrogen bottle group 4 in sequence and then enter step 7, where M0 is the preset upper limit of leaked hydrogen, M0 = 400 PPM, and ΔPb is the preset lower limit of the reverse hydrogen replenishment rate, ΔPb = 0.2 MPa;

[0065] Step 7. Pull out the hydrogenation gun or the reverse hydrogen replenishment gun according to the prompt of the controller 20.

Claims

1. A control method for a multi-hydrogen-filling fuel cell hydrogen supply device, wherein the multi-hydrogen-filling fuel cell hydrogen supply device has a first hydrogen filling port (1) and a second hydrogen filling port (2), the first hydrogen filling port (1) is connected to the inlet pipe (5) of a first hydrogen cylinder group (4) through a first hydrogen filling valve (3), and the second hydrogen filling port (2) is connected to the inlet pipe (8) of a second hydrogen cylinder group (7) through a second hydrogen filling valve (6), and the inlet pipe (5) of the first hydrogen cylinder group (4) and the inlet pipe (8) of the second hydrogen cylinder group (7) are connected to each other. A bottle group connection valve (9) is connected between the outlet pipes (8). The outlet pipe (10) of the first hydrogen bottle group (4) and the outlet pipe (11) of the second hydrogen bottle group (7) are connected to the pressure reducing valve (12) and the hydrogen supply valve (13) in sequence. A parallel hydrogen supply valve (14) is connected between the outlet pipe (10) of the first hydrogen bottle group (4) and the outlet pipe (11) of the second hydrogen bottle group (7) or / and each hydrogen bottle of the first hydrogen bottle group (4) and the second hydrogen bottle group (7) is provided with a bottle mouth valve (15). The inlet pipe (5) of the first hydrogen cylinder group (4) and the inlet pipe (8) of the second hydrogen cylinder group (7) are respectively equipped with a first hydrogen cylinder group pressure sensor (16) and a second hydrogen cylinder group pressure sensor (17). A hydrogen concentration sensor (18) and a hydrogen gun insertion sensor (19) are provided at both the first hydrogen filling port (1) and the second hydrogen filling port (2). A controller (20) is provided, with the first hydrogen cylinder group pressure sensor (16), the second hydrogen cylinder group pressure sensor (17), the hydrogen concentration sensor (18), and the hydrogen gun insertion sensor (19) connected to the input terminal of the controller (20). The first hydrogen filling valve (3), the second hydrogen filling valve (6), the cylinder group connection valve (9), the hydrogen supply valve (13), and the parallel hydrogen supply valve (14) or / and the cylinder opening valve (15) connected to the output terminal of the controller (20). The characteristic feature is that: Control the system in the following steps: Step 1. Start After inserting the external hydrogen refueling gun or reverse hydrogen refueling gun into the first hydrogen refueling port (1) or / and the second hydrogen refueling port (2), manually input the hydrogen refueling or reverse hydrogen refueling command signal to the controller (20); Step 2. Connection Detection The controller (20) records the signal from the sensor (19) inserted by the hydrogen gun as the first hydrogen port (1) or / and the second hydrogen port (2), and performs step 3 or step 5 according to the hydrogen addition or reverse hydrogen replenishment command signal respectively; Step 3. Hydrogenation Start-up Detection Step 3.1 Check whether the hydrogen cylinder group connected to the hydrogen filling port determined in Step 2 is in hydrogen supply state. If no, proceed to Step 4. If yes, proceed to Step 3.

2. Step 3.2 The controller (20) issues an alarm indicating an operational conflict and returns to step 1; Step 4. Add hydrogen and monitor in real time. Step 4.1 Close the cylinder group connection valve (9), the parallel hydrogen supply valve (14) or the corresponding hydrogen cylinder group's cylinder port valve (15), and open the hydrogen filling valve corresponding to the determined hydrogen filling port. At the same time, the controller (20) will alarm to indicate that the hydrogen filling state has been entered. Step 4.2 Using the corresponding hydrogen concentration sensor (18) and the corresponding hydrogen cylinder group pressure sensor, monitor the hydrogen concentration m and pressure P in real time, and calculate the pressure change value ΔP within a unit time interval ΔT in real time. The pressure change value ΔP is the current pressure minus the pressure value before ΔT time. ΔT is 0.1-30 seconds. When the hydrogen concentration m≥M0, or ΔP≤ΔPa, or P≥Pmax is detected, the hydrogen filling valve is closed and the process proceeds to step 7. M0 is the preset upper limit of leaked hydrogen, ΔPa is the preset lower limit of hydrogen filling rate, and Pmax is the maximum pressure of the hydrogen cylinder group. Step 5. Reverse hydrogen replenishment start-up detection Detect the pressure value P1 of the hydrogen cylinder group pressure sensor connected to the hydrogen filling port recorded in step 2. If the pressure value P1 is greater than the preset pressure value P0, proceed to step 6; otherwise, the controller (20) will alarm and indicate that the cylinder group pressure is low and return to step 1. Step 6. Reverse hydrogen replenishment and monitor in real time. Open the hydrogenation valve corresponding to the determined hydrogenation port, and through the corresponding hydrogen concentration sensor and the corresponding hydrogen cylinder group pressure sensor, monitor the hydrogen concentration m and the pressure P in real time, and calculate the pressure change value ΔP within the unit time interval ΔT in real time. The pressure change value ΔP is the current pressure minus the pressure value before the time of ΔT, and the ΔT is 0.1 - 30 seconds; when it is detected that the hydrogen concentration m ≥ M0, or ΔP > 0, or |ΔP| ≤ ΔPb, or P < P0, close the corresponding hydrogenation valve or the corresponding bottle mouth valve (15) and then enter step 7, where M0 is the preset upper limit of leaked hydrogen, and ΔPb is the preset lower limit of the reverse hydrogen supply rate; Step 7. Pull out the hydrogenation gun or the reverse hydrogen supply gun according to the prompt of the controller (20).

2. The control method for the multi-hydrogen-port fuel cell hydrogen supply device according to claim 1, characterized in that: There are two of the pressure reducing valve (12) and the hydrogen supply valve (13), which are respectively connected to the outlet pipe (10) of the first hydrogen cylinder group (4) and the outlet pipe (11) of the second hydrogen cylinder group (7).

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