Cooling device for hydrogen producing and charging machine and control method thereof

Abstract

The invention discloses a cooling device for a hydrogen production and charging machine and a control method of the cooling device, and belongs to the field of hydrogen production and charging. The cooling device is arranged outside a hydrogen bottle bin in the hydrogen producing and filling machine and is used for cooling a hydrogen storage bottle placed in the hydrogen bottle bin; the cooling device comprises a cold conduction block, a semiconductor chilling plate and a heat dissipation module. The cold conduction block is embedded or partially embedded in the circumferential direction of the hydrogen bottle bin, so that the inner side of the cold conduction block can be in contact with the outer surface of the hydrogen storage bottle; the cold end of the semiconductor chilling plate is connected with the outer side of the cold conduction block, and the hot end of the semiconductor chilling plate is provided with a heat dissipation module. According to the hydrogen storage tank, the semiconductor chilling plate and the cold conduction block are used for exchanging heat with the hydrogen storage tank in a heat transfer mode, and the temperature of the hydrogen storage tank is reduced. The cold guide block is tightly attached to the cold end of the semiconductor chilling plate and the hydrogen storage bottle, loss of the refrigeration effect is reduced, the temperature of the hydrogen storage bottle is prevented from being too high, and the hydrogen charging efficiency and the hydrogen absorption amount of the hydrogen storage bottle are improved.

Description

Technical Field

[0001] The present invention belongs to the field of hydrogen production and filling, and in particular to a cooling device for a hydrogen production and filling machine and a control method thereof. Background Art

[0002] Alloy hydrogen storage is a promising method for hydrogen storage. Metal hydrogen storage materials absorb hydrogen by forming hydrides with hydrogen. Upon heating the hydrides, the hydrogen is released, resulting in excellent reversible cycling. Solid-state hydrogen storage devices, as key reaction carriers for hydrogen storage alloys, play a crucial role in the storage and transport of hydrogen during the absorption and desorption phases of metal hydrogen storage materials.

[0003] The hydrogen absorption reaction of metal hydrogen storage materials is an exothermic reaction. Once the hydrogen absorption reaction begins, the temperature of the solid-state hydrogen storage device will rise rapidly and dramatically, reaching around 130°C. This temperature increase has a significant impact on the overall hydrogen absorption capacity and rate of the solid-state hydrogen storage device. Therefore, the thermal conductivity or cooling design of the solid-state hydrogen storage device is particularly important. Summary of the Invention

[0004] In order to overcome the above technical defects, the present invention provides a cooling device for a hydrogen production and filling machine and a control method thereof to solve the problems involved in the background technology.

[0005] The present invention provides a cooling device for a hydrogen generator and a control method thereof. The cooling device is arranged outside a hydrogen bottle bin in the hydrogen generator and cools down a hydrogen storage bottle placed in the hydrogen bottle bin.

[0006] The cooling device includes: a cooling block, a refrigeration fin and a heat dissipation module; the cooling block is embedded or partially embedded in the circumference of the hydrogen bottle warehouse, so that the inner side of the cooling block can contact the outer surface of the hydrogen storage bottle; the cold end of the refrigeration fin is connected to the outer side of the cooling block, and the hot end of the refrigeration fin is provided with a heat dissipation module.

[0007] Preferably or optionally, the inner side of the cooling block is an arc surface, which is adapted to the outer contour of the gas cylinder; the outer side of the cooling block is a plane, which fits the cold end of the refrigeration plate.

[0008] Preferably or optionally, the heat dissipation module comprises: a plurality of heat dissipation fins and at least one heat dissipation fan;

[0009] The heat sink is distributed on the hot end of the refrigeration fin, and the heat dissipation fan is fixed on the outer surface of the heat sink or on one side of the heat sink.

[0010] Preferably or optionally, the cooling device further comprises a heat-insulating cover, and the heat-insulating cover can at least wrap the hydrogen bottle bin.

[0011] Preferably or optionally, the cooling device further comprises a controller, and the controller is signal-connected with the refrigeration fins and the heat dissipation module.

[0012] Preferably or optionally, a temperature sensor is provided on the inner side of the cooling block;

[0013] The temperature sensor is signal-connected to the controller.

[0014] The present invention also provides a control method based on the cooling device for the hydrogen generator and filling machine. When the PEM electrolyzer in the hydrogen generator and filling machine starts to produce hydrogen, the control method includes:

[0015] Obtaining the temperature of the inner side of the cooling block through a temperature sensor;

[0016] It is determined whether the temperature inside the cooling block is greater than a first threshold value. If so, the cooling plate is turned on to cool until the temperature inside the cooling block drops to a second threshold value.

[0017] Preferably or optionally, the control method includes:

[0018] Obtain the hydrogen inflow rate of the hydrogen storage bottle at time T and time T+ΔT, and calculate the difference between the hydrogen inflow rate at time T+ΔT and time T;

[0019] Determine whether the difference between the hydrogen inlet flow rate at time T+ΔT and time T is greater than a fourth threshold, and if so, increase the cooling power of the refrigeration plate; if not, proceed to the next step;

[0020] It is determined whether the difference between the hydrogen inlet flow rate at time T+ΔT and time T is less than a fifth threshold value. If so, the cooling power of the refrigeration plate is increased; if not, the current temperature is maintained.

[0021] Preferably or optionally, the control method includes:

[0022] Obtain the hydrogen pressure in the hydrogen filling pipeline of the hydrogen generator and / or the hydrogen storage bottle at time T and time T+ΔT, and calculate the difference between the hydrogen pressure at time T+ΔT and time T;

[0023] Determine whether the difference between the hydrogen pressure of the hydrogen storage bottle at time T+ΔT and time T is greater than a sixth threshold, and if so, increase the cooling power of the refrigeration plate; if not, proceed to the next step;

[0024] Determine whether the difference between the hydrogen pressure of the hydrogen storage bottle at time T+ΔT and time T is less than a seventh threshold. If so, increase the cooling power of the refrigeration plate; if not, maintain the current temperature.

[0025] The present invention also provides a control method based on the cooling device for the hydrogen generator and filling machine. When the PEM electrolyzer in the hydrogen generator and filling machine starts to produce hydrogen, the control method includes:

[0026] Obtaining the temperature of the inner side of the cooling block through a temperature sensor;

[0027] Determine whether the temperature inside the cooling block is greater than a third threshold, and the third threshold is greater than the first threshold; if so, turn on the cooling fin until the temperature inside the cooling block drops to a second threshold, and then turn off the cooling.

[0028] The present invention relates to a cooling device for a hydrogen generator and a control method thereof, which has the following beneficial effects compared to the prior art:

[0029] 1. The present invention dissipates the heat generated by the hydrogen storage alloy during hydrogen absorption by dissipating the heat generated during hydrogen absorption by the hydrogen storage alloy, preventing the hydrogen storage bottle from overheating and effectively improving the hydrogen filling efficiency and hydrogen absorption capacity of the hydrogen storage bottle. The cooling device uses a semiconductor refrigeration plate and a cooling block to exchange heat with the hydrogen storage bottle through heat transfer, thereby lowering its temperature. The cooling block fits tightly with the cold end of the semiconductor refrigeration plate and the hydrogen storage bottle, reducing the loss of cooling effect.

[0030] 2. The present invention uses a temperature sensor as the main input variable to achieve temperature control; and uses hydrogen filling flow and / or hydrogen pressure as auxiliary input variables to further adjust the temperature of the hydrogen storage bottle, thereby compensating for the hysteresis of the temperature sensor on heat detection lag, and at the same time reducing the temperature adjustment lag phenomenon, thereby achieving stability and timeliness of the temperature adjustment of the hydrogen storage bottle, and improving the hydrogen filling efficiency and hydrogen absorption capacity of the hydrogen storage bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the external structure of the hydrogen making and filling machine in the present invention.

[0032] Figure 2 It is a structural schematic diagram of the cooling device in the present invention.

[0033] Figure 3 It is a structural schematic diagram of the cooling device in the present invention.

[0034] Figure 4 It is a partial enlarged view of the cooling block in the present invention.

[0035] Figure 5 This is a schematic diagram of the control method of the present invention. Figure 1 .

[0036] Figure 6 This is a schematic diagram of the control method of the present invention. Figure 2 .

[0037] The accompanying drawings are marked as follows: 100, hydrogen bottle warehouse; 110, hydrogen storage bottle; 200, cooling device; 210, cooling block; 211, inner side of cooling block; 212, outer side of cooling block; 220, semiconductor refrigeration plate; 231, heat sink; 232, cooling fan; 240, thermal insulation cover. DETAILED DESCRIPTION

[0038] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0039] Example 1

[0040] See attached Figures 1 to 4 A cooling device 200 for a hydrogen production and filling machine is provided. The cooling device 200 is arranged outside the hydrogen bottle warehouse 100 in the hydrogen production and filling machine to cool the hydrogen storage bottle 110 placed in the hydrogen bottle warehouse 100. The cooling device 200 includes: a cooling block 211, a cooling plate, a heat dissipation module and a controller.

[0041] The cooling block 211 is made of a material with a high thermal conductivity, such as metal aluminum or aluminum alloy, and is installed in an embedded or partially embedded manner on the circumference of the hydrogen bottle warehouse 100, and the inner side 211 of the cooling block is an arc surface, which is adapted to the outer contour of the gas storage bottle, so that the inner side 211 of the cooling block can contact the outer surface of the hydrogen storage bottle 110; the refrigeration plate is a semiconductor refrigeration plate 220, and the cold end of the semiconductor refrigeration plate 220 is connected to the outer side 212 of the cooling block. Specifically, the outer side 212 of the cooling block is a plane, which is attached to the cold end of the semiconductor refrigeration plate 220, and heat exchange is carried out by direct contact. Moreover, the contact area between the cooling block 211 and the bottle body of the gas storage bottle is large, and the heat exchange efficiency is high.

[0042] In a further embodiment, the cooling device 200 includes two semiconductor refrigeration plates 220 and two cooling blocks 211. The cooling blocks 211 are respectively arranged on the upper and lower sides of the hydrogen bottle warehouse 100. The two semiconductor refrigeration plates 220 are connected in series and the power cord is led out. The cold end is in contact with the outer side 212 of the cooling block. After power is turned on, the cold end starts to cool.

[0043] In addition, a heat dissipation module is provided at the hot end of the semiconductor refrigeration plate 220. The controller is connected to the semiconductor refrigeration plate 220 and the heat dissipation module by signal. When the semiconductor refrigeration plate starts to cool, the heat dissipation module starts to dissipate heat synchronously. The heat dissipation intensity of the semiconductor refrigeration plate 220 is improved by the heat dissipation module, thereby increasing the impact on the cooling performance. The heat dissipation module includes: a heat conduction block and at least one heat dissipation fan 232; the heat conduction block includes a plurality of heat dissipation fins 231, and the heat dissipation fins are distributed on the hot end of the semiconductor refrigeration plate 220, and the heat dissipation fan 232 is fixed on the outer surface of the heat dissipation fin 231 or fixed on one side of the heat dissipation fin 231. Taking into account the structural distribution of the entire hydrogen production and filling machine, the heat dissipation fan 232 is distributed on the outer surface of the heat dissipation fin 231 in this embodiment. See the attached figure. Figure 2 The heat sinks 231 are spaced at predetermined intervals and vertically distributed at the hot end of the semiconductor refrigeration chip 220 to form a secondary heat dissipation channel. A heat dissipation fan 232 is installed on the outer surface of the heat sink 231. The heat in the secondary heat dissipation channel is introduced into the primary heat dissipation channel of the hydrogen generator through the heat dissipation fan 232, and finally discharged through the primary heat dissipation channel.

[0044] Since the hydrogen production and filling equipment also includes a variety of heat-generating components, such as a PEM electrolyzer and a power supply, in order to prevent the temperature of the hydrogen storage bottle 110 from being increased by heat conduction, heat convection and heat radiation from other heat-generating components, a heat-insulating layer is used to wrap the hydrogen storage bottle 110. The cooling device 200 also includes a heat-insulating cover 240. The heat-insulating cover 240 can at least wrap the hydrogen bottle compartment 100. The heat-insulating cover is made of EVA foam and wraps and covers the hydrogen storage bottle compartment 100, thereby isolating most areas of the hydrogen storage bottle 100 from the outside world and greatly reducing the impact of the ambient temperature on the hydrogen storage bottle 110.

[0045] In a further embodiment, a temperature sensor is provided on the inner side 211 of the cooling block; the temperature sensor is connected to the controller. A temperature sensor can be connected to the inner side 211 of the cooling block to control the cooling module. In low-temperature environments, the cooling module can be shut down to reduce power consumption of the entire device.

[0046] In order to facilitate understanding of the technical solution of the cooling device 200 for the hydrogen production and filling machine, a brief description is given of its heat conduction process: the process of hydrogen adsorption by the hydrogen storage alloy will release heat. After heat conduction through the metal alloy and the wall of the hydrogen storage bottle 110, the cooling block 210 is tightly fitted around the circumference of the hydrogen storage bottle 110 and the heat is transferred to the cooling block 210. The semiconductor refrigeration plate 220 and the cooling block 210 exchange heat with the hydrogen storage bottle 110 in a heat transfer manner to reduce the temperature of the hydrogen storage bottle 110. The heat of the semiconductor refrigeration plate 220 is discharged through the heat sink 231 and the cooling fan 232.

[0047] Example 2

[0048] Based on Example 1, this embodiment proposes a control method based on a cooling device 200 for a hydrogen generator. The PEM electrolyzer in the hydrogen generator starts to produce hydrogen. Figure 5 The control method includes: S110, obtaining the temperature of the inner side 211 of the cooling block via a temperature sensor; S120, determining whether the temperature of the inner side 211 of the cooling block is greater than a first threshold; if so, activating cooling with the semiconductor refrigeration plate 220 until the temperature of the inner side 211 of the cooling block drops to a second threshold. When the PEM (electrolyzer) of the hydrogen generator is operating, hydrogen generated by the electrolyzer is fed into the hydrogen storage bottle 110. The hydrogen storage alloy in the hydrogen storage bottle 110 absorbs hydrogen and releases heat. Excessively high bottle temperature affects the hydrogen absorption rate, so cooling is required.

[0049] The hydrogen storage alloy has a strong exothermic effect during the hydrogen absorption process, so the increase in temperature is not conducive to the hydrogen absorption process. When the temperature of the inner side 211 of the cooling block is low, it can quickly exchange heat with the hydrogen storage alloy inside the hydrogen storage bottle 110, thereby increasing the hydrogen absorption rate of the hydrogen storage alloy. The first threshold value is less than the temperature at which the hydrogen storage alloy reaches the hydrogen absorption / dehydrogenation equilibrium under the maximum hydrogen filling pressure. The value of the first threshold value is related to the hydrogen filling pressure, alloy material and other parameters of the hydrogen filling machine. After multiple tests, it was found that when the temperature of the hydrogen storage bottle is ≥30°C, the hydrogen absorption efficiency of the hydrogen storage alloy decreases significantly; therefore, considering the economy in actual applications, the temperature of the first threshold value is a value within the range of room temperature to 30°C. Preferably, the temperature of the first threshold value is a value within the range of 22 to 28°C. Since the outside of the hydrogen bottle warehouse 100 is wrapped with the insulation cover 240, it has a relatively good insulation effect, and when the temperature of the hydrogen storage bottle is ≤15°C, the increase in the hydrogenation rate is not particularly significant. Therefore, the temperature of the second threshold is a value within the range of 15°C to room temperature. Preferably, the temperature of the second threshold is a value within the range of 18 to 12°C.

[0050] Among them, at a fixed hydrogen absorption rate, since the hydrogen storage bottle 110 is in direct contact with the cooling block 211, rapid heat conduction can be achieved. In addition, during the hydrogen charging process, the hydrogen storage alloy will be pulverized, resulting in changes in the effective density and porosity of the hydrogen storage alloy, which in turn causes the effective thermal conductivity of the entire hydrogen storage alloy to further decrease, resulting in slower heat extraction. Therefore, the temperature distribution within the hydrogen storage bottle 110 shows a gradient change, and the closer to the center of the hydrogen storage bottle 110 or the center of the hydrogen storage alloy stack, the higher the temperature. There is a lag in the temperature detection on the cooling block 210. Therefore, this embodiment makes further temperature control for the above-mentioned control method.

[0051] Specifically, the controller is part of the central control module of the hydrogen production and filling machine, or is communicatively connected to the central control module of the hydrogen production and filling machine to achieve data sharing. The control method includes: S130, obtaining the hydrogen inflow rate of the hydrogen storage bottle 110 at time T and time T+ΔT, and calculating the difference between the hydrogen inflow rate at time T+ΔT and time T; S140, judging whether the difference between the hydrogen inflow rate at time T+ΔT and time T is greater than a fourth threshold value, if so, increasing the cooling power of the semiconductor refrigeration plate 220; if not, executing the next step; S150, judging whether the difference between the hydrogen inflow rate at time T+ΔT and time T is less than a fifth threshold value, if so, increasing the cooling power of the semiconductor refrigeration plate 220; if not, maintaining the current temperature. It can be understood that the fourth threshold value is a positive value, the fifth threshold value is a negative value, and the fourth threshold value and the fifth threshold value are reciprocal numbers of each other. The values ​​of the fourth threshold value and the fifth threshold value are empirical values, which are related to parameters such as the hydrogen absorption rate-time curve of the hydrogen storage alloy and the effective thermal conductivity of the hydrogen storage alloy.

[0052] When the hydrogen inflow rate is too high, it indicates to some extent that the hydrogen storage bottle 110 is absorbing hydrogen at a faster rate, which in turn generates more heat. If this heat cannot be conducted away in a timely manner, the hydrogen storage bottle 110 will also reduce its hydrogen absorption rate, thereby reducing the hydrogen filling efficiency. This embodiment obtains the hydrogen inflow flow rate of the hydrogen storage bottle 110 and further adjusts the temperature of the hydrogen storage bottle 110. This compensates for the hysteresis of the temperature sensor in detecting heat, reduces the temperature adjustment lag, achieves stable and timely temperature adjustment of the hydrogen storage bottle 110, and improves the hydrogen filling efficiency and hydrogen absorption capacity of the hydrogen storage bottle 110.

[0053] Similarly, the control method includes: S160, obtaining the hydrogen pressure in the hydrogen filling pipeline of the hydrogen generator and / or the hydrogen storage bottle 110 at time T and time T+ΔT, and calculating the difference in hydrogen pressure between time T+ΔT and time T; S170, judging whether the difference in hydrogen pressure of the hydrogen storage bottle 110 at time T+ΔT and time T is greater than the sixth threshold value, if so, increasing the cooling power of the semiconductor refrigeration plate 220; if not, executing the next step; S180, judging whether the difference in hydrogen pressure of the hydrogen storage bottle 110 at time T+ΔT and time T is less than the seventh threshold value, if so, increasing the cooling power of the semiconductor refrigeration plate 220; if not, maintaining the current temperature.

[0054] It should be noted that at the beginning of hydrogen charging, hydrogen first contacts the hydrogen storage alloy near the wall of the hydrogen storage bottle 110 and starts the hydrogen absorption reaction. Since the hydrogen storage bottle 110 is in direct contact with the cooling block 210, the heat conduction block and the gas storage bottle can quickly realize heat conduction, and the heat exchange effect is ideal. Therefore, the temperature of the inner side 211 of the cooling block is basically close to the actual value. Only by using the temperature sensor as the main input variable, the temperature control can be achieved accurately and quickly; in the stable stage of hydrogen charging, the hydrogen absorption reaction proceeds from the wall of the hydrogen storage bottle 110 to a position close to the center of the hydrogen storage bottle 110 or the center of the hydrogen storage alloy stack. At this time, the temperature sensor has a certain hysteresis. Therefore, by introducing the hydrogen charging flow and / or hydrogen pressure as auxiliary input quantities, the cooling power of the cooling device 200 is further fine-tuned to improve the accuracy of temperature control, thereby improving the hydrogen charging efficiency and hydrogen absorption amount of the hydrogen storage bottle 110.

[0055] In a further embodiment, when the PEM electrolyzer in the hydrogen generator is not working, refer to the attached Figure 6 The control method includes: S210, obtaining the temperature of the inner side 211 of the cooling block via a temperature sensor; S220, determining whether the temperature of the inner side 211 of the cooling block is greater than a third threshold, where the third threshold is greater than the first threshold; if so, activating cooling by the semiconductor refrigeration plate 220 until the temperature of the inner side 211 of the cooling block drops to a second threshold, and then deactivating cooling. When the PEM (electrolyzer) of the hydrogen generator is not operating, the bottle temperature may rise due to the external environment, resulting in an increase in the hydrogen pressure within the bottle, necessitating cooling.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A cooling device for a hydrogen generator, characterized in that: The cooling device is arranged outside the hydrogen bottle warehouse in the hydrogen making and filling machine to cool down the hydrogen storage bottle placed in the hydrogen bottle warehouse; The cooling device includes: a cooling block, a refrigeration fin and a heat dissipation module; the cooling block is embedded or partially embedded in the circumference of the hydrogen bottle warehouse, so that the inner side of the cooling block can contact the outer surface of the hydrogen storage bottle; the cold end of the refrigeration fin is connected to the outer side of the cooling block, and the hot end of the refrigeration fin is provided with a heat dissipation module.

2. The cooling device for the hydrogen generator and filling machine according to claim 1, characterized in that: The inner side of the cooling block is an arc surface, which is matched with the outer contour of the gas storage bottle; the outer side of the cooling block is a plane, which is attached to the cold end of the refrigeration plate.

3. The cooling device for a hydrogen generator and filling machine according to claim 1, characterized in that: The heat dissipation module comprises: a heat conduction block and at least one heat dissipation fan; The heat-conducting block is distributed on the hot end of the refrigeration plate, and the heat dissipation fan is fixed on the outer surface of the heat-conducting block or on one side of the heat-conducting block.

4. The cooling device for a hydrogen generator and filling machine according to claim 1, characterized in that: The cooling device also includes a heat-insulating cover, which can at least wrap the hydrogen bottle warehouse.

5. The cooling device for the hydrogen generator and filling machine according to claim 1, characterized in that: The cooling device also includes a controller, which is signal-connected to the refrigeration fins and the heat dissipation module.

6. The cooling device for the hydrogen generator and filling machine according to claim 5, characterized in that: A temperature sensor is provided on the inner side of the cooling block; The temperature sensor is signal-connected to the controller.

7. A control method for a cooling device for a hydrogen generator and filling machine according to any one of claims 1 to 6, characterized in that: The PEM electrolyzer in the hydrogen generator and filler starts to work to produce hydrogen, and the control method includes: Acquiring the temperature of the inner side of the cooling block by a temperature sensor; It is determined whether the temperature of the inner side of the cooling block is greater than a first threshold value. If so, the cooling plate is turned on for cooling until the temperature of the inner side of the cooling block drops to a second threshold value.

8. The control method of the cooling device for the hydrogen generator and filling machine according to claim 7, characterized in that: The control method comprises: Obtain the hydrogen inflow rate of the hydrogen storage bottle at time T and time T+ΔT, and calculate the difference between the hydrogen inflow rate at time T+ΔT and time T; Determine whether the difference between the hydrogen inlet flow rate at time T+ΔT and time T is greater than a fourth threshold value, if so, increase the refrigeration power of the refrigeration plate; if not, execute the next step; It is determined whether the difference between the hydrogen inlet flow rate at the time T+ΔT and the time T is less than a fifth threshold value. If so, the cooling power of the refrigeration plate is increased; if not, the current temperature is maintained.

9. The control method of the cooling device for the hydrogen generator and filling machine according to claim 7, characterized in that: The control method comprises: Obtain the hydrogen pressure in the hydrogen filling pipeline of the hydrogen generator and / or the hydrogen storage bottle at time T and time T+ΔT, and calculate the difference between the hydrogen pressure at time T+ΔT and time T; Determine whether the difference between the hydrogen pressure of the hydrogen storage bottle at the time T+ΔT and the time T is greater than a sixth threshold value, if so, increase the refrigeration power of the refrigeration plate; if not, execute the next step; It is determined whether the difference between the hydrogen pressure of the hydrogen storage bottle at the time T+ΔT and the time T is less than the seventh threshold value. If so, the refrigeration power of the refrigeration plate is increased; if not, the current temperature is maintained.

10. A control method for a cooling device for a hydrogen generator and filling machine according to any one of claims 1 to 6, characterized in that: When the PEM electrolyzer in the hydrogen generator is not working, the control method includes: Acquiring the temperature of the inner side of the cooling block by a temperature sensor; Determine whether the temperature of the inner side of the cooling block is greater than a third threshold, and the third threshold is greater than the first threshold; if so, the refrigeration plate turns on cooling until the temperature of the inner side of the cooling block drops to a second threshold, and then turns off cooling.

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