Liquid hydrogen powerpack based on hydrogen fuel cell

Abstract

The present invention relates to a liquid hydrogen power pack, wherein, in an exemplary embodiment, the power pack comprises: a hydrogen fuel cell comprising at least one stack in which an electrochemical reaction in which gaseous hydrogen combines with oxygen in the air takes place; a liquid hydrogen container for sealing and containing liquid hydrogen; a vaporizer for heating and vaporizing the liquid hydrogen contained in the liquid hydrogen container; a hydrogen line for supplying gaseous hydrogen inside the liquid hydrogen container to the hydrogen fuel cell; at least one heat exchanger disposed on the hydrogen line through which the gaseous hydrogen passes; an exhaust fan installed in the hydrogen fuel cell and discharging air inside the hydrogen fuel cell containing heat generated by the electrochemical reaction toward the heat exchanger; and a control unit for controlling the operation of the hydrogen fuel cell, the exhaust fan, and the vaporizer.

Description

Technology Field

[0001] The present invention relates to a liquid hydrogen power pack based on a hydrogen fuel cell, and more specifically, to a liquid hydrogen power pack that can be made compact and lightweight by simplifying and improving the efficiency of the liquid hydrogen vaporization structure. Background Technology

[0002] Hydrogen is considered the ultimate clean energy source, completely free from the harmful or greenhouse gases emitted in large quantities from fossil fuels. However, because generating energy by burning hydrogen itself is too dangerous, hydrogen is generally utilized based on fuel cell technology.

[0003] To practically utilize hydrogen fuel cells, it is necessary to use liquid hydrogen as fuel, considering the calorific value of hydrogen; for this reason, liquid hydrogen power packs based on hydrogen fuel cells are equipped with a liquid hydrogen container and a vaporizer (heater). In such liquid hydrogen power packs, the temperature of the vaporized hydrogen exiting through the hydrogen line is approximately -80°C. Since this falls outside the temperature range of gaseous hydrogen usable by the hydrogen fuel cell stack, a separate device must be provided to raise the temperature of the gaseous hydrogen traveling along the line. Typically, methods such as extending the length of the hydrogen line, which is composed of copper tubing, to increase the surface area in contact with the atmosphere, or exchanging heat through a gas-liquid heat exchanger, are utilized.

[0004] However, since these conventional methods are heavy due to copper tubes or gas-liquid heat exchangers, they are a major disadvantage in terms of payload for small mobility devices such as drones or AGVs (Automated Guided Vehicles), and there is a disadvantage that the weight increases as the device is operated due to condensation occurring around the copper tubes. Prior art literature

[0005] Korean Patent Publication No. 10-2020-0114383 (Published on Oct. 07, 2020) The problem to be solved

[0006] The purpose of the present invention is to provide a liquid hydrogen power pack that can be configured to be compact and lightweight by simplifying and improving the efficiency of the liquid hydrogen vaporization structure, and also to suppress or prevent condensation occurring in the hydrogen line.

[0007] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below. means of solving the problem

[0008] The present invention relates to a liquid hydrogen power pack based on a hydrogen fuel cell, wherein, in an exemplary embodiment, the power pack comprises: a hydrogen fuel cell comprising at least one stack in which an electrochemical reaction in which gaseous hydrogen combines with oxygen in the air takes place; a liquid hydrogen container for sealing and containing liquid hydrogen; a vaporizer for heating and vaporizing the liquid hydrogen contained in the liquid hydrogen container; a hydrogen line for supplying gaseous hydrogen inside the liquid hydrogen container to the hydrogen fuel cell; at least one heat exchanger disposed on the hydrogen line through which the gaseous hydrogen passes; an exhaust fan installed in the hydrogen fuel cell and discharging air inside the hydrogen fuel cell containing heat generated by the electrochemical reaction toward the heat exchanger; and a control unit for controlling the operation of the hydrogen fuel cell, the exhaust fan, and the vaporizer.

[0009] The number of the heat exchanger and the exhaust fan corresponds one-to-one, and the exhaust fan may be positioned directly above or directly below the heat exchanger.

[0010] At least some of the air discharged from the exhaust fan may be directed toward the connection joint between the liquid hydrogen container and the hydrogen line.

[0011] A flow controller for calculating the remaining amount of liquid hydrogen in the liquid hydrogen container may be disposed on the hydrogen line between the hydrogen fuel cell and the heat exchanger.

[0012] In addition, a first pressure sensor is disposed on the hydrogen line between the heat exchanger and the flow controller to measure the pressure of gaseous hydrogen passing through the heat exchanger, and the operation of the vaporizer can be controlled so that the pressure measured by the first pressure sensor is within a preset range.

[0013] In an exemplary embodiment, a vaporizer controller that controls the operation of the vaporizer may be included, and the control unit may communicate with the vaporizer controller to provide pressure data measured by the first pressure sensor to the vaporizer controller or provide an emergency stop command to the vaporizer controller.

[0014] In addition, a second pressure sensor for measuring the pressure of gaseous hydrogen flowing into the hydrogen fuel cell is disposed on the hydrogen line between the flow controller and the hydrogen fuel cell, and the control unit may provide an emergency stop command to the vaporizer controller when the pressure measured by the second pressure sensor deviates from a preset range.

[0015] It may include a temperature sensor disposed on the hydrogen line between the heat exchanger and the flow controller, and the control unit may provide an emergency stop command to the vaporizer controller when the temperature measured by the temperature sensor deviates from a preset range.

[0016] In addition, the control unit includes a valve positioned upstream and / or downstream of the carburetor controller, and the control unit can perform control to shut off the valve along with providing an emergency stop command to the carburetor controller.

[0017] Meanwhile, according to one embodiment of the present invention, a hydrogen detection sensor is included in the upper interior of the liquid hydrogen power pack, and when a hydrogen leak is detected by the hydrogen detection sensor, the control unit can perform control to shut off the valve along with providing an emergency stop command to the vaporizer controller.

[0018] In addition, it includes a relief valve branched on the hydrogen line between the liquid hydrogen container and the heat exchanger, and the relief valve can discharge gaseous hydrogen on the hydrogen line to the outside of the liquid hydrogen power pack when the pressure of gaseous hydrogen exceeds a preset upper limit. Effects of the invention

[0019] The liquid hydrogen power pack of the present invention, having the above-described configuration, can raise the temperature of gaseous hydrogen to an appropriate level by utilizing heat generated by an electrochemical reaction during the operation of a hydrogen fuel cell, and thus, by not adding a separate heating means, the liquid hydrogen power pack can be configured to be compact and lightweight.

[0020] In addition, by utilizing the hot air used to heat gaseous hydrogen to prevent condensation in the hydrogen line, the problem of weight increase due to condensation during the operation of the liquid hydrogen power pack can also be resolved.

[0021] However, the technical effects obtainable through the present invention are not limited to those described above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description of the invention below. Brief explanation of the drawing

[0022] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a drawing illustrating the overall configuration of a liquid hydrogen power pack according to one embodiment of the present invention. FIG. 2 is a schematic diagram illustrating the vaporization structure in the liquid hydrogen power pack of FIG. 1. FIG. 3 is a drawing illustrating the overall configuration of a liquid hydrogen power pack according to another embodiment of the present invention. Specific details for implementing the invention

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0024] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0025] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0026] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0028] FIG. 1 is a drawing illustrating the overall configuration of a liquid hydrogen power pack (10) according to an embodiment of the present invention. With reference to FIG. 1, the liquid hydrogen power pack (10) of the present invention will be described in detail. The main components of the liquid hydrogen power pack (10) can be broadly divided into a hydrogen fuel cell (100), a liquid hydrogen container (200) and a vaporizer (220), a hydrogen line (300) and a heat exchanger (400), and a control unit (700). In FIG. 1, the component indicated by the reference numeral "20" is a housing, and the housing (20) corresponds to a case in which various components of the liquid hydrogen power pack (10) are mounted and accommodated.

[0029] The hydrogen fuel cell (100) includes at least one stack in which an electrochemical reaction occurs in which gaseous hydrogen (GH2) and oxygen in the air combine. Although the stack is not shown in FIG. 1 inside the hydrogen fuel cell (100), the configuration of the stack in which hydrogen passing through the (-) electrode and oxygen passing through the (+) electrode electrochemically react to produce water and heat while generating current in the electrodes is a known configuration and is well known to a person skilled in the art.

[0030] The liquid hydrogen container (200) is a fuel container that seals and contains liquid hydrogen (LH2), and is equipped with an insulating structure that can suppress the natural evaporation (vaporization) of the liquid hydrogen (LH2) to the maximum extent and a pressure-resistant structure that can withstand the internal pressure of the vaporized hydrogen. The liquid hydrogen container (200) can be mounted to the housing (20) in a fixed or detachable manner, and in the case of a fixed mounting, it may be provided with an inlet for filling the liquid hydrogen.

[0031] And, the vaporizer (220) installed on the liquid hydrogen container (200) acts as a type of heater and serves to forcibly vaporize the liquid hydrogen (LH2) into gaseous hydrogen (GH2) by heating. The vaporizer (220) can be mounted in close contact with the liquid hydrogen container (200) for smooth heat conduction, and the gaseous hydrogen (GH2) evaporated by the vaporizer (220) is collected above the liquid hydrogen container (200) by buoyancy.

[0032] The hydrogen line (300) corresponds to a pipe that supplies gaseous hydrogen (GH2) inside a liquid hydrogen container (200) to a hydrogen fuel cell (100). Various devices and sensors described later may be installed on the hydrogen line (300), and it may be made of copper pipe to facilitate smooth heat conduction to the gaseous hydrogen (GH2) flowing inside.

[0033] On this hydrogen line (300), at least one heat exchanger (400) through which gaseous hydrogen (GH2) passes is installed. That is, the entire amount of gaseous hydrogen (GH2) flowing from the liquid hydrogen container (200) to the hydrogen fuel cell (100) passes through the heat exchanger (400). Corresponding to this heat exchanger (400), an exhaust fan (500) is installed in the hydrogen fuel cell (100) to discharge the air inside containing the heat generated by the electrochemical reaction occurring in the stack toward the heat exchanger (400).

[0034] When the hydrogen vaporized inside the liquid hydrogen container (200) comes out through the hydrogen line (300), it is at a temperature of approximately -80°C, and this must be raised to the temperature range of gaseous hydrogen (GH2) that can be used by the stack of the hydrogen fuel cell (100). The present invention allows for the omission of a separate heating device other than the vaporizer (220) by utilizing waste heat generated inside the hydrogen fuel cell (100). That is, the heat exchanger (400) installed on the hydrogen line (300) is a gas-gas heat exchanger, and the gaseous hydrogen (GH2) passing through the inside of the heat exchanger (400) receives heat from the hot air discharged from the exhaust fan (500) and rises to a usable temperature.

[0035] By releasing waste heat accumulated inside the hydrogen fuel cell (100) through the exhaust fan (500), cooling is promoted, and the gaseous hydrogen (GH2) fuel is heated to a usable temperature in the hydrogen fuel cell (100). As a result, the energy efficiency of the liquid hydrogen power pack (10) is improved, and the vaporization structure of the liquid hydrogen (LH2) is simplified, making it easier to construct the liquid hydrogen power pack (10) in a small and lightweight manner.

[0036] It may be desirable for the number of heat exchangers (400) and exhaust fans (500) to correspond one-to-one, and for example, as shown in FIG. 1, two exhaust fans (500) may be provided corresponding to two heat exchangers (400) connected in series. The number and size of the heat exchangers (400) can be appropriately designed by taking into account the capacity of the hydrogen fuel cell (100), that is, the flow rate of gaseous hydrogen (GH2) per unit time required by the hydrogen fuel cell (100).

[0037] In addition, not only the number of heat exchangers (400) and exhaust fans (500) but also their relative positions may correspond one-to-one, which may be advantageous for raising the temperature of gaseous hydrogen (GH2). For example, as shown in FIG. 1, it may be desirable to align the exhaust fan (500) so that it is positioned directly above the heat exchanger (400), that is, so that the heat transfer surface of the heat exchanger (400) aligns with the main discharge direction of the exhaust fan (500). However, although FIG. 1 describes the exhaust fan (500) being positioned directly above the heat exchanger (400) as the hydrogen fuel cell (100) is positioned above the heat exchanger (400), it will be obvious that if the arrangement is reversed, the exhaust fan (500) will be positioned directly below the heat exchanger (400).

[0038] Additionally, the liquid hydrogen power pack (10) includes a control unit (700) that controls the operation of the hydrogen fuel cell (100), exhaust fan (500), and vaporizer (220). For effective control of the control unit (700), various sensors (601, 602, 610), valves (620), etc. may be provided, and this will be explained in detail in the relevant section.

[0039] For reference, Figure 1 shows that a battery (110) is included in the hydrogen fuel cell (100). The battery (110) supplies power to start the hydrogen fuel cell (100), while also storing (charging) surplus power during the operation of the hydrogen fuel cell (100) and supplying (discharging) reserve power in the event of a sudden power outage in an emergency.

[0040] Figure 2 is a schematic diagram illustrating the vaporization structure in the liquid hydrogen power pack (10) of Figure 1.

[0041] The liquid hydrogen power pack (10) of FIG. 2 is in a state where the hydrogen fuel cell (100) is started by the battery (110) and is operating normally, and gaseous hydrogen (GH2) produced smoothly by the operation of the vaporizer (220) is supplied to the hydrogen fuel cell (100) along the hydrogen line (300) so that electricity, water, and heat are continuously produced. The heat accompanying the electrochemical reaction, which is an exothermic reaction, is discharged from the hydrogen fuel cell (100) in an air-cooled manner by the exhaust fan (500), and the main discharge direction of the exhaust fan (500) is directed toward the heat exchanger (400) on the hydrogen line (300). Gaseous hydrogen (GH2) passing through the heat exchanger (400) is heated by the hot air of the exhaust fan (500), and as it passes through an appropriate number of heat exchangers (400) (in FIG. 1 and FIG. 2, two heat exchangers are connected in series), the temperature of the gaseous hydrogen (GH2) reaches within the temperature range required by the hydrogen fuel cell (100).

[0042] For reference, the hydrogen fuel cell (100) may use an evaporative cooling method in addition to an air cooling method. The evaporative cooling method is a method of cooling the hydrogen fuel cell (100) by reusing water generated by the reaction of hydrogen and oxygen when the hydrogen fuel cell (100) is in operation, but the liquid hydrogen power pack (10) of the present invention is not limited to a hydrogen fuel cell (100) of the evaporative cooling method.

[0043] Additionally, referring to FIG. 2, at least a portion of the air discharged from the exhaust fan (500) is directed toward the connecting joint (210) between the liquid hydrogen container (200) and the hydrogen line (300). In other words, the location of the connecting joint (210) between the liquid hydrogen container (200) and the hydrogen line (300) is selected as a point exposed downward from the exhaust fan (500). Gaseous hydrogen (GH2) escaping from the liquid hydrogen container (200), which has an insulating structure, instantaneously releases a large amount of cold air as the insulating structure disappears at the connecting joint (210) area, and active condensation occurs at the connecting joint (210) during this process. Since the accumulation of condensation increases the weight of the liquid hydrogen power pack (10) and causes failure due to corrosion, the present invention directs at least a portion of the air discharged from the exhaust fan (500) toward the connecting joint (210) to dry water droplets or induces discharge into the drainage line (650) provided on the bottom surface of the housing (20).

[0044] Returning to Fig. 1, the apparatus for stably operating the liquid hydrogen power pack (10) will be described.

[0045] First, in order to operate the liquid hydrogen power pack (10) stably, it is necessary to determine the remaining amount of liquid hydrogen (LH2) inside the liquid hydrogen container (200). Operating the hydrogen fuel cell (100) when hydrogen fuel is not properly supplied causes serious damage to the stack. To this end, a flow controller (410) for calculating the remaining amount of liquid hydrogen (LH2) inside the liquid hydrogen container (200) may be placed on the hydrogen line (300) between the hydrogen fuel cell (100) and the heat exchanger (400). The flow controller (410) (Mass Flow Controller, MFC) can measure the flow rate of gaseous hydrogen (GH2) that has passed through while uniformly controlling the flow rate of gaseous hydrogen (GH2) (acting as a regulator). Accordingly, the control unit (700) can calculate the remaining amount of liquid hydrogen (LH2) in the liquid hydrogen container (200) by back-calculating from the volume of gaseous hydrogen (GH2) that passed through the flow controller (410), based on the relationship between the volume of gaseous hydrogen (GH2) per volume of liquid hydrogen (LH2) filled in the liquid hydrogen container (200).

[0046] Additionally, a first pressure sensor (601) is positioned on the hydrogen line (300) between the heat exchanger (400) and the flow controller (410) to measure the pressure of gaseous hydrogen (GH2) that has passed through the heat exchanger (400). The first pressure sensor (601) is intended to measure the amount (pressure) of gaseous hydrogen (GH2) generated by the operation of the vaporizer (220), and accordingly, the operation of the vaporizer (220) can be feedback controlled in various ways, such as on / off or PID control, so that the pressure measured by the first pressure sensor (601) is within a preset range.

[0047] For example, the liquid hydrogen power pack (10) may include a vaporizer controller (710) that controls the operation of the vaporizer (220). The vaporizer controller (710) can control the vaporizer (220) to operate at an appropriate temperature by utilizing a temperature sensor (not shown) built into the vaporizer (220). However, although the control unit (700) and the vaporizer controller (710) are shown as independent components in the description and drawings, it is obvious that the control unit (700) and the vaporizer controller (710) can be integrated into one. For example, the vaporizer controller (710) may be composed of a separate control algorithm that shares hardware with the control unit (700).

[0048] Aside from the hardware configuration, from a functional perspective, the control unit (700) can communicate with the vaporizer controller (710). For example, the control unit (700) can provide pressure data measured by the first pressure sensor (601) to the vaporizer controller (710) or provide an emergency stop command to the vaporizer controller (710). Here, the emergency stop command may include all measures related to the suspension of operation of the hydrogen fuel cell (100), such as stopping the vaporizer (220) and closing the valve (620) to be described later, as well as notification of the emergency stop status by the communication device (670).

[0049] In addition, a second pressure sensor (602) for measuring the pressure of gaseous hydrogen (GH2) flowing into the hydrogen fuel cell (100) may be placed on the hydrogen line (300) between the flow controller (410) and the hydrogen fuel cell (100). The second pressure sensor (602) is installed to determine whether gaseous hydrogen (GH2) is supplied at a suitable pressure required by the hydrogen fuel cell (100). Accordingly, the control unit (700) may provide an emergency stop command to the vaporizer controller (710) if the pressure measured by the second pressure sensor (602) deviates from a preset range.

[0050] Additionally, the liquid hydrogen power pack (10) of the present invention may include at least one temperature sensor (610) to determine the temperature state of gaseous hydrogen (GH2). For example, the temperature sensor (610) may be placed on the hydrogen line (300) between the heat exchanger (400) and the flow controller (410), and the control unit (700) may provide an emergency stop command to the vaporizer controller (710) if the temperature measured by the temperature sensor (610) upstream of the flow controller (410) deviates from a preset range. Furthermore, the temperature sensor (610) placed upstream of the flow controller (410) may also be used for temperature compensation when the flow controller (410) measures the flow rate of gaseous hydrogen (GH2). Referring to FIG. 1, it is shown that a temperature sensor (610) may also be placed upstream and / or downstream of the heat exchanger (400), and through the temperature sensor (610) placed around the heat exchanger (400), the temperature rise state and efficiency of gaseous hydrogen (GH2) dependent on the operation of the hydrogen fuel cell (100) can be determined.

[0051] Additionally, a valve (620) may be positioned upstream and / or downstream of the vaporizer controller (710), and the control unit (700) may perform control to shut off the valve (620) along with providing an emergency stop command to the vaporizer controller (710). By closing the valve (620), the supply of gaseous hydrogen (GH2) to the hydrogen fuel cell (100) is cut off. If multiple valves (620) are provided, all valves (620) may be shut off / opened simultaneously, and may also be operated sequentially along either upstream or downstream to prevent damage to the hydrogen fuel cell (100) caused by sudden shut-off / opening operations.

[0052] FIG. 3 is a drawing showing the overall configuration of a liquid hydrogen power pack (10) according to another embodiment of the present invention, and additional configurations considering safety, etc. of the liquid hydrogen power pack (10) are also shown.

[0053] Referring to FIG. 3, a hydrogen detection sensor (630) is positioned above the interior (inside the housing) of the liquid hydrogen power pack (10). When a leak of gaseous hydrogen (GH2) occurs inside the housing (20), the lightest hydrogen gas accumulates above the housing (20), so the hydrogen detection sensor (630) is positioned at the highest area of ​​the housing (20). When a hydrogen leak is detected by the hydrogen detection sensor (630), the control unit (700) can perform control to shut off the valve (620) along with providing an emergency stop command to the vaporizer controller (710).

[0054] Additionally, a relief valve (640) branched on the hydrogen line (300) between the liquid hydrogen container (200) and the heat exchanger (400) may be included, and the relief valve (640) prevents the pressure from rising excessively by preventing gaseous hydrogen (GH2) generated by the natural vaporization of liquid hydrogen (LH2) from accumulating in the hydrogen line (300) closed by the valve (620) even when the operation of the vaporizer (220) is stopped. In other words, the relief valve (640) automatically opens when the pressure of the gaseous hydrogen (GH2) exceeds a preset upper limit, thereby discharging the gaseous hydrogen (GH2) in the hydrogen line (300) to the outside of the liquid hydrogen power pack (10).

[0055] Meanwhile, the liquid hydrogen power pack (10) can be configured to perform monitoring by transmitting various information to the outside, such as the operating status (power generation amount, temperature, etc.) of the hydrogen fuel cell (100), the hydrogen remaining amount error status, and the emergency stop status, by providing a communication device (670) using wireless communication such as LTE / 5G.

[0056] Additionally, the hydrogen fuel cell (100) may be equipped with a hydrogen purge line (660). Water generated within the stack (not shown) of the hydrogen fuel cell (100) is mainly generated in the cathode channel and is transferred into the anode channel through the electrolyte membrane by the diffusion of water. The water present in the anode channel hinders the supply of gaseous hydrogen (GH2), which is the fuel gas, to the electrode, thereby degrading the power generation performance of the hydrogen fuel cell (100), and this is commonly referred to as the flooding phenomenon.

[0057] Accordingly, the hydrogen fuel cell (100) performs hydrogen purging to prevent such flooding phenomena. By purging the water accumulated in the stack to the outside along with gaseous hydrogen (GH2), the power generation performance of the hydrogen fuel cell (100), which had degraded due to the flooding phenomenon, is restored. The hydrogen purging line (660) is provided for the forced discharge of such water and extends outside the housing (20) so that gaseous hydrogen (GH2) does not accumulate inside the housing (20). For reference, it would be desirable to keep the hydrogen detection sensor (630) at a sufficient distance from the hydrogen purging line (660) so that the hydrogen detection sensor (630) does not malfunction due to the hydrogen purging.

[0059] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. Explanation of the symbols

[0060] 10: Liquid Hydrogen Power Pack 20: Housing 100: Hydrogen fuel cell 110: Battery 200: Liquid hydrogen container 210: Connecting joint 220: Carburetor 300: Hydrogen line 400: Heat exchanger 410: Flow controller 500: Exhaust fan 601: First pressure sensor 602: Second pressure sensor 610: Temperature sensor 620: Valve 630: Hydrogen detection sensor 640: Relief valve 650: Drain line 660: Hydrogen purge line 670: Communication device 700: Control unit 710: Carburetor controller LH2: Liquid hydrogen GH2: Gaseous hydrogen

Claims

Claim 1 A hydrogen fuel cell comprising at least one stack in which an electrochemical reaction in which gaseous hydrogen combines with oxygen in the air takes place; a liquid hydrogen container for sealing and containing liquid hydrogen; a vaporizer for heating and vaporizing the liquid hydrogen contained in the liquid hydrogen container; a hydrogen line for supplying gaseous hydrogen inside the liquid hydrogen container to the hydrogen fuel cell; at least one heat exchanger disposed on the hydrogen line through which the gaseous hydrogen passes; an exhaust fan installed in the hydrogen fuel cell and discharging air inside the hydrogen fuel cell containing heat generated by the electrochemical reaction toward the heat exchanger; and a control unit for controlling the operation of the hydrogen fuel cell, the exhaust fan, and the vaporizer.It includes, wherein the number of the heat exchanger and the exhaust fan corresponds one-to-one, and the exhaust fan is positioned directly above or directly below the heat exchanger, and at least a portion of the air discharged from the exhaust fan is directed toward the connection joint between the liquid hydrogen container and the hydrogen line, and includes a battery accompanying the hydrogen fuel cell, and includes a hydrogen purge line provided to extend outside the housing of the hydrogen fuel cell to discharge water outside the housing to prevent flooding, and a flow controller for calculating the remaining amount of liquid hydrogen in the liquid hydrogen container is positioned on the hydrogen line between the hydrogen fuel cell and the heat exchanger, and a first pressure sensor for measuring the pressure of gaseous hydrogen passing through the heat exchanger is positioned on the hydrogen line between the heat exchanger and the flow controller, and the operation of the vaporizer is controlled so that the pressure measured by the first pressure sensor is within a preset range, and includes a vaporizer controller for controlling the operation of the vaporizer, and the control unit performs communication with the vaporizer controller and, regarding the vaporizer controller, the A liquid hydrogen power pack that provides pressure data measured by a first pressure sensor or provides an emergency stop command to the vaporizer controller, wherein a second pressure sensor is disposed on the hydrogen line between the flow controller and the hydrogen fuel cell to measure the pressure of gaseous hydrogen flowing into the hydrogen fuel cell, and the control unit provides an emergency stop command to the vaporizer controller when the pressure measured by the second pressure sensor deviates from a preset range. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete Claim 9 A liquid hydrogen power pack according to claim 1, comprising a temperature sensor disposed on a hydrogen line between the heat exchanger and the flow controller, wherein the control unit provides an emergency stop command to the vaporizer controller when the temperature measured by the temperature sensor deviates from a preset range. Claim 10 A liquid hydrogen power pack according to claim 9, comprising a valve disposed upstream and / or downstream of the vaporizer controller, wherein the control unit performs control to shut off the valve along with providing an emergency stop command to the vaporizer controller. Claim 11 A liquid hydrogen power pack according to claim 10, comprising a hydrogen detection sensor disposed on the upper interior of the liquid hydrogen power pack, wherein the control unit performs control to shut off the valve along with providing an emergency stop command to the vaporizer controller when a hydrogen leak is detected by the hydrogen detection sensor. Claim 12 A liquid hydrogen power pack according to claim 1, comprising a relief valve branched on a hydrogen line between the liquid hydrogen container and the heat exchanger, wherein the relief valve discharges gaseous hydrogen on the hydrogen line to the outside of the liquid hydrogen power pack when the pressure of gaseous hydrogen exceeds a preset upper limit.

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