Fuel cell system and control method thereof

Abstract

The present invention provides a fuel cell system. In one embodiment, the fuel cell system comprises: a hydrogen supply device; a fuel cell device that produces power using hydrogen supplied from the hydrogen supply device and supplies it to a load; and a controller that controls the hydrogen supply device and the fuel cell device. The fuel cell device comprises a main fuel cell and an auxiliary fuel cell connected to the hydrogen supply device; and an operating device that operates the main fuel cell. The controller can control the auxiliary fuel cell so that power is supplied from the auxiliary fuel cell to the operating device during the initial operation of the main fuel cell.

Description

Technology Field

[0001] The present invention relates to a fuel cell system and a method for controlling a fuel cell system. More specifically, the present invention relates to a fuel cell system comprising a hydrogen supply device for producing hydrogen and a fuel cell device for receiving hydrogen from the hydrogen supply device and producing electricity, and a method for controlling the same. Background Technology

[0002] A fuel cell is a type of power generation device that converts the chemical energy contained in fuel into electrical energy through an electrochemical reaction within a fuel cell stack, rather than converting it into heat through combustion. It can be applied not only to supply power for industrial, residential, and vehicle propulsion but also to power small electrical and electronic products, particularly portable devices. Specifically, a fuel cell directly converts the chemical reaction energy of hydrogen and oxygen contained in hydrocarbon-based substances, such as methanol, ethanol, and natural gas, into electrical energy.

[0003] Generally, a fuel cell system includes a fuel cell stack, a Balance of Plant (BOP) (including an air blower, a hydrogen recirculation blower, a cooling water circulation pump, etc.), a control system for monitoring the operation of the fuel cell stack, and an auxiliary battery. After boosting the voltage of the auxiliary battery to a high voltage using a converter connected to the auxiliary battery, the boosted high voltage was used to power various fuel cell components and other control systems required for fuel cell operation until the fuel cell stack began normal operation. Subsequently, once the fuel cell startup was complete and the stack was normalized, the power from the stack was used.

[0004] However, auxiliary batteries have the problem of requiring periodic charging due to discharge from use or natural discharge. Additionally, when fuel cell components are driven and the fuel cell is started using only the power from the auxiliary battery, there is a problem that the auxiliary battery, which serves as the power source, may be subjected to an excessive load during high-voltage boosting.

[0005] To solve this, an external power source can be connected instead of a power bank, but this presents the problem of being inconvenient to use. The problem to be solved

[0006] One objective of the present invention is to provide a fuel cell system that does not require an auxiliary battery or external power source, and a method for controlling the same.

[0007] In addition, one objective of the present invention is to provide a fuel cell system and a control method thereof, wherein a hydrogen supply device and a fuel cell device are provided separably.

[0008] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0009] To solve the problem described above, the present invention provides a fuel cell system. In one embodiment, the fuel cell system comprises: a hydrogen supply device; a fuel cell device that produces power using hydrogen supplied from the hydrogen supply device and supplies it to a load; and a controller that controls the hydrogen supply device and the fuel cell device. The fuel cell device comprises a main fuel cell and an auxiliary fuel cell connected to the hydrogen supply device; and an operating device that operates the main fuel cell. The controller can control the auxiliary fuel cell so that power is supplied from the auxiliary fuel cell to the operating device during the initial operation of the main fuel cell.

[0010] In one embodiment, the capacity of the main fuel cell may be greater than the capacity of the auxiliary fuel cell.

[0011] In one embodiment, the controller can control the hydrogen supply device so that when the initial operation is completed, hydrogen is supplied to the main fuel cell but the supply of hydrogen to the auxiliary fuel cell is stopped.

[0012] In one embodiment, the system further includes a first converter provided between a main fuel cell and a load to supply power to the load; and a second converter provided between an auxiliary fuel cell, a driving device, and the first converter to supply power to the driving device or the first converter, and the controller can control the second converter so that the second converter supplies power to the driving device during initial operation and supplies surplus power to the first converter after the initial operation is completed.

[0013] In one embodiment, the hydrogen supply device may include a pressure reducer that supplies the produced hydrogen at reduced pressure to the main fuel cell and the auxiliary fuel cell, respectively.

[0014] In one embodiment, the hydrogen supply device may further include a hydrogen reactor for obtaining a reactant by reacting a hydride, a catalyst, and water; a moisture remover connected to the hydrogen reactor for obtaining hydrogen by removing moisture from the reactant; and a buffer connected to the moisture remover for temporarily storing hydrogen supplied to a pressure reducer.

[0015] In one embodiment, the system includes a first pressure reducer connected to a buffer to reduce and supply hydrogen to a main fuel cell; and a second pressure reducer connected to a buffer to reduce and supply hydrogen to an auxiliary fuel cell, wherein the required pressure of the second pressure reducer may be provided to be lower than the required pressure of the first pressure reducer.

[0016] In one embodiment, the moisture remover may include a moisture absorbent inside.

[0017] In one embodiment, the buffer may include a pressure gauge for measuring the pressure of the internal space; and a relief valve provided to relieve the pressure of the internal space when the pressure measured by the pressure gauge exceeds a critical pressure.

[0018] In one embodiment, the hydrogen supply device and the fuel cell device may be provided separately.

[0019] In addition, the present invention provides a method for controlling a fuel cell system. In one embodiment, the method for controlling a fuel cell system comprises: a hydrogen supply device; and a fuel cell device including a main fuel cell and an auxiliary fuel cell that receives hydrogen from the hydrogen supply device and produces power, wherein the method may include a normal operation step of producing power through the main fuel cell and supplying power to a load; and an initial operation step prior to the normal operation step of producing power through the auxiliary fuel cell and supplying power to an operation device that operates the main fuel cell.

[0020] In one embodiment, the capacity of the main fuel cell may be greater than the capacity of the auxiliary fuel cell.

[0021] In one embodiment, during the normal operation phase, hydrogen is supplied to the main fuel cell, but the supply of hydrogen to the auxiliary fuel cell may be stopped.

[0022] In one embodiment, during the normal operation phase, surplus power of the auxiliary fuel cell can be supplied to the load.

[0023] In one embodiment, hydrogen at a first pressure is supplied to an auxiliary fuel cell during the initial driving phase and hydrogen at a second pressure is supplied to a main fuel cell during the normal driving phase, and the second pressure may be provided at a greater pressure than the first pressure. Effects of the invention

[0024] According to one embodiment of the present invention, there is an advantage that the initial operation of the fuel cell is possible without an auxiliary battery or external power source.

[0025] According to one embodiment of the present invention, there is an advantage in that the hydrogen supply device and the fuel cell device are provided to be separable.

[0026] The effects of the present invention are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the attached drawings. Brief explanation of the drawing

[0027] FIG. 1 shows a fuel cell system according to one embodiment of the present invention. FIG. 2 shows the configuration of a hydrogen supply device according to one embodiment of the present invention. FIG. 3 shows a hydrogen reactor according to one embodiment of the present invention. Figure 4 shows the appearance of a moisture remover and a hydrogen reactor according to one embodiment of the present invention. Figure 5 shows the appearance of a buffer according to one embodiment of the present invention. FIG. 6 shows the configuration of a fuel cell device according to one embodiment of the present invention. FIG. 7 shows the appearance of a fuel cell device according to one embodiment of the present invention. FIG. 8 is a flowchart of a control method for a fuel cell system according to one embodiment of the present invention. Specific details for implementing the invention

[0028] The embodiments described in this specification may be modified in various different forms, and the technology according to one embodiment is not limited to the embodiments described below. Furthermore, the embodiment of one embodiment is provided to more fully explain the present disclosure to those skilled in the art.

[0029] Additionally, the singular form used in the specification and the appended claims may be intended to include the plural form unless specifically indicated otherwise in the context.

[0030] Additionally, the numerical ranges used in this specification include lower and upper limits and all values ​​within the range, increments logically derived from the form and width of the defined range, all of which are limited values, and all possible combinations of upper and lower limits of the numerical range defined in different forms. Unless otherwise specifically defined in the specification of this invention, values ​​outside the numerical range that may occur due to experimental error or rounding are also included in the defined numerical range.

[0031] Furthermore, throughout the specification, the term "comprising" a component means that, unless specifically stated otherwise, it does not exclude other components but rather may include additional components.

[0032] FIG. 1 illustrates a fuel cell system (2000) according to an embodiment of the present invention. Referring to FIG. 1, the fuel cell system (2000) includes a hydrogen supply device (2200), a fuel cell device (2400), and a controller (2100). The hydrogen supply device (2200) produces hydrogen and supplies it to the fuel cell device (2400). The fuel cell device (2400) produces power using the hydrogen supplied from the hydrogen supply device (2200) and supplies it to a load (2500). The controller (2100) controls the hydrogen supply device (2200) and the fuel cell device (2400). The hydrogen supply device (2200) includes a hydrogen reactor (2202), a water remover (2204), a buffer (2206), and a pressure reducer (2208). In one example, power produced through the auxiliary fuel cell (2402) is referred to as auxiliary power, and power produced through the main fuel cell (2401) is referred to as main power. Referring to FIG. 1, the main power is transmitted to the load (2500) via the main fuel cell (2401) and the first converter (2406), and the auxiliary power is transmitted to the operating device (2403) via the auxiliary fuel cell (2402) and the second converter (2404), or to the load (2500) via the auxiliary fuel cell (2402) and the first converter (2406).

[0033] FIG. 2 shows the configuration of a hydrogen supply device (2200) according to one embodiment of the present invention. Referring to FIG. 2, a hydrogen reactor (2202), a moisture remover (2204), a buffer (2206), and a pressure reducer (2208) are connected sequentially.

[0034] A hydrogen reactor (2202) obtains a reaction product containing hydrogen by reacting a hydride, such as NaBH4, a catalyst, and water. FIG. 3 shows a hydrogen reactor (1000, 2202) according to an embodiment of the present invention. Referring to FIG. 3, in one example, the hydrogen reactor (2202) is provided in the form of a reaction vessel (100). Hydrogen is obtained by inserting a fuel pack (200) into the reaction vessel (100). The reaction vessel (100) may further include a fuel pack inlet (111). The fuel pack inlet (111) may be formed larger than the fuel pack (200) so that the fuel pack (200) can be easily inserted. Water is filled to a predetermined height in the internal space (120) of the reaction vessel (100). A fuel pack (200) is introduced into the internal space (120), and the fuel pack (200) can react with the water filled in the internal space (120) to generate hydrogen. At this time, one side of the reaction vessel (100) is combined with the container lid (110), thereby blocking the internal space (120) from the outside and preventing the generated hydrogen from spreading outside the reaction vessel (100).

[0035] In one example, the fuel (210) provided in the fuel pack (200) may be a hydride, such as sodium boron hydride (NaBH4), lithium boron hydride (LiBH4), lithium hydride (LiH), sodium hydride (NaH), etc. The packaging (220) of the fuel pack (220) may be made of a water-soluble material and may have the property of dissolving within a predetermined time simply by being submerged in water without any external force. When the fuel pack (200) is introduced into the reaction vessel (100), the packaging (220) reacts with the water inside the reaction vessel (100) and dissolves, and the fuel (210) comes into contact with the water in the internal space (120) to generate hydrogen.

[0036] The hydrogen reactor (1000) may further include one or more water injection channels (300) on at least one surface of the container lid (110) or one side of the reaction vessel (100). The water injection channel (300) may include a pipe (310) having one end located outside the reaction vessel (100) and the other end located inside the reaction vessel (100). One end of the water injection channel (300) may be connected to a tank where water is stored. Additionally, the water injection channel (300) may be connected to a pump to allow external water to be injected into the internal space (120) of the reaction vessel (100). The water injection channel (300) may include a piston bar (320) and a stopper (330). The piston bar (320) is provided at the other end of the water injection channel (300), has one end inserted into the inner side of the other end of the water injection channel (300), and can move up and down. At this time, a ledge is formed at one end of the piston bar (320) and the other end of the pipe (310) so that the piston bar (320) is not separated from the pipe (310). A stopper (330) is attached to the other end of the piston bar (320), and the surface area of ​​one side may be larger than the cross-sectional area of ​​the pipe (310). Accordingly, when the water inside the reaction vessel (100) is filled above a predetermined upper limit of water level, the piston bar (320) is pressed into the inside of the pipe (310) by external pressure, and the stopper (330) is caught on the other end of the pipe (310) to close the pipe (310) and prevent water from being overfilled. Additionally, when the water inside the reaction vessel (100) is below a predetermined upper limit of water level, a portion of the pipe (310) may be moved to the outside so that the stopper (330) separates from the other end of the pipe (310), thereby opening the pipe (310) and allowing water to be introduced into the internal space (120) of the reaction vessel (100). At this time, the other end of the pipe (310) may be positioned at a predetermined upper limit of water level to be filled into the reaction vessel (100), thereby automatically controlling the water level so that it does not exceed the upper limit.The upper limit of the water level can be adjusted according to the user's needs, and accordingly, the position of the other end of the pipe (310) can be arbitrarily adjusted by the user. However, if the water is filled above the upper limit due to special circumstances, the water can be automatically drained by opening the drainage channel as described above, so that the water inside the reaction vessel (100) can maintain a constant height. Accordingly, the user can maintain and adjust the amount of water inside the reaction vessel (100) at a constant level, and finally, can adjust and predict the amount of hydrogen generated (L / min) and the time of hydrogen generation (time).

[0037] In one example, at least one hydrogen collection channel (500) may be further included on at least one surface of the container lid (110) or one side of the reaction vessel (100). The other end of the hydrogen collection channel (500) may be located above the upper limit of the water filled in the reaction vessel (100) which is predetermined, and it is preferable that the hydrogen collection channel (500) be installed so as not to come into contact with the water inside the reaction vessel (100). The hydrogen collection channel (500) collects hydrogen molecules in the air inside the reaction vessel (100) generated by the reaction of fuel (210) and water. Additionally, the hydrogen collection channel (500) may include a filter (510) that includes an adsorption part for adsorbing moisture at the other end. The filter (510) can adsorb and filter not only moisture in the air but also other foreign substances floating in the air, thereby collecting only pure hydrogen molecules.

[0038] Additionally, the reaction vessel (100) may further include a fuel mounting means (400) for fixing the position of the fuel pack (200) in the internal space (120). The fuel mounting means (400) may be a filter screen (410).

[0039] FIG. 4 shows a moisture remover (2204) and a hydrogen reactor (2202) according to one embodiment of the present invention. FIG. 4(a) shows a top view of the moisture remover (2204) and the hydrogen reactor (2202), and FIG. 4(b) shows a side view of the moisture remover (2204) and the hydrogen reactor (2202).

[0040] The amount and time of production of hydrogen can be controlled according to the number of hydrogen reactors (2202). In one example, multiple hydrogen reactors (2202) may be provided as shown in FIG. 4. For instance, two hydrogen reactors (2202a, 2202b) may be provided. Alternatively, three or more hydrogen reactors (2202) may be provided. A moisture remover (2204) is connected to the hydrogen reactor (2202) to remove moisture from the reactants and obtain hydrogen.

[0041] The yellow line (A) indicates the path of hydrogen movement. Reactants containing hydrogen generated in the hydrogen reactor (2202) flow into the moisture remover (2204) along the line (22021) connecting the hydrogen reactor (2202) and the moisture remover (2204).

[0042] In one example, the moisture remover (2204) is provided in the form of a container having an internal space. The moisture remover (2204) may contain a desiccant inside. In one example, the desiccant may be provided as silica gel (SiO2). The desiccant may be provided in a packaged form within the moisture remover (2204). The reactant obtained from the hydrogen reactor (2202) contains hydrogen, but moisture may be generated along with the hydrogen. The reactant is fed into the moisture remover (2204), and moisture is removed from the reactant by the desiccant, and only hydrogen is supplied to the fuel cell device (2400).

[0043] FIG. 5 shows the appearance of a buffer (2206) according to an embodiment of the present invention. Referring to FIG. 5, the buffer (2206) may be provided in the form of a container capable of withstanding a predetermined pressure. The buffer (2206) temporarily stores hydrogen connected to a moisture remover (2204) and supplied to a pressure reducer (2208). In one example, the buffer (2206) includes a pressure gauge (2201) and a relief valve (2205). The pressure gauge (2201) measures the pressure in the internal space of the buffer (2206). The relief valve (2205) relieves the pressure in the internal space when the pressure measured by the pressure gauge (2201) exceeds a critical pressure, thereby maintaining the internal pressure of the buffer (2206) at a desired pressure.

[0044] The pressure reducer (2208) reduces the pressure of hydrogen stored in the buffer (2206) and supplies low-pressure hydrogen to the fuel cell device (2400). The pressure reducer (2208) includes a first pressure reducer (2209) and a second pressure reducer (2207), each connected to the buffer (2206). The first pressure reducer (2209) reduces the pressure of hydrogen and supplies it to the main fuel cell (2401) described later, and the second pressure reducer (2207) reduces the pressure of hydrogen and supplies it to the auxiliary fuel cell (2402) described later. The required pressure of the second pressure reducer (2207) is provided to be lower than the required pressure of the first pressure reducer (2209). Accordingly, the pressure of the hydrogen supplied to the main fuel cell (2401) is provided to be higher than the pressure of the hydrogen supplied to the auxiliary fuel cell (2402).

[0045] In one example, the hydrogen supply device (2200) and the fuel cell device (2400) may be provided in a separable manner. Accordingly, the hydrogen supply device (2200) and the fuel cell device (2400) can be used separately for convenience, thereby making the fuel cell device (2400) portable. For example, when the fuel cell device (2400) requires a hydrogen supply, the fuel cell device (2400) and the hydrogen supply device (2200) are connected, and when a hydrogen supply is not required, the fuel cell device (2400) and the hydrogen supply device (2200) are separated for use.

[0046] FIG. 6 shows the configuration of a fuel cell device (2400) according to one embodiment of the present invention. Referring to FIG. 6, the fuel cell device (2400) includes a main fuel cell (2401), an auxiliary fuel cell (2402), an operating device (2403), a first converter (2406), and a second converter (2404).

[0047] The main fuel cell (2401) is connected to a load (2500) to transfer power produced by the main fuel cell (2401) to the load (2500). The auxiliary fuel cell (2402) is connected to the operating device (2403) of the main fuel cell (2401) to transfer power produced by the auxiliary fuel cell (2402) to the operating device (2403). The main fuel cell (2401) and the auxiliary fuel cell (2402) are each connected to a hydrogen supply device (2200). As described above, the main fuel cell (2401) is connected to a first voltage reducer (2209), and the auxiliary fuel cell (2402) is connected to a second voltage reducer (2207). In one example, the main fuel cell (2401) has an operating device (2403), and the auxiliary fuel cell (2402) does not have a separate operating device (2403). The operating device (2403) operates the main fuel cell (2401). In one example, the operating device (2403) may include a Balance of Plant (BOP) of the main fuel cell (2401) (including an air blower, a hydrogen recirculation blower, a cooling water circulation pump, etc.) and a control system that monitors the operation of the main fuel cell (2401).

[0048] The capacity of the main fuel cell (2401) may be provided to be greater than the capacity of the auxiliary fuel cell (2402). In one example, the capacity of the main fuel cell (2401) may be provided to be between 30W and 100W. For instance, the capacity of the main fuel cell (2401) may be provided to be 50W. In one example, the capacity of the auxiliary fuel cell (2402) may be provided to be 20W or less.

[0049] The first converter (2406) is provided between the main fuel cell (2401) and the load (2500) to supply power to the load (2500). The second converter (2404) is provided between the auxiliary fuel cell (2402), the operating device (2403), and the first converter to supply power to the operating device (2403) or the first converter. Power produced from the main fuel cell (2401) is transferred to the load (2500) through the first converter (2406). Power produced from the auxiliary fuel cell (2402) is transferred to the operating device (2403) through the second converter (2404). Surplus power remaining after use in the operating device (2403) is transferred to the load (2500) through the second converter (2404) and the first converter (2406).

[0050] FIG. 7 shows the appearance of a fuel cell device (2400) according to one embodiment of the present invention. As described above, the auxiliary fuel cell (2402) is not provided with a driving device (2403), and only the main fuel cell (2401) device (2400) has a driving device (2403). The auxiliary fuel cell (2402) supplies power to the driving device (2403) through a wire (24021).

[0051] A method for controlling a fuel cell system (2000) according to the present invention will be described below with reference to FIG. 8. Referring to FIG. 8, the method for controlling a fuel cell system (2000) according to the present invention includes an initial driving step (S100) and a normal driving step (S200). In the initial driving step (S100), power is produced through an auxiliary fuel cell (2402) and supplied to a driving device (2403) that operates a main fuel cell (2401). Then, in the normal driving step (S200), power is produced through the main fuel cell (2401) and supplied to a load (2500).

[0052] In the initial driving phase (S100), hydrogen at a first pressure is supplied to the auxiliary fuel cell (2402). In the initial driving phase (S100), power is supplied to the driving device (2403) through the auxiliary fuel cell (2402), and the control system of the auxiliary fuel cell and the main fuel cell (2401) is activated. Afterward, when the initial driving is completed, hydrogen is no longer supplied to the auxiliary fuel cell (2402), and power production through the auxiliary fuel cell (2402) is stopped. Hydrogen can be supplied to the main fuel cell (2401) in the initial driving phase (S100).

[0053] When the initial operation is completed, the normal operation phase (S200) begins. In the normal operation phase (S200), hydrogen at a second pressure is supplied to the main fuel cell (2401), and the second pressure may be provided at a higher pressure than the first pressure. In the normal operation phase (S200), hydrogen is supplied to the main fuel cell (2401) to produce power through the main fuel cell (2401), and the supply of hydrogen to the auxiliary fuel cell (2402) may be stopped. In the normal operation phase (S200), the surplus power remaining in the auxiliary fuel cell (2402) may be supplied to the load (2500) through the second converter and the first converter (2406).

[0054] According to one embodiment of the present invention, there is an advantage that the fuel cell device (2400) can be operated without an external power source or auxiliary battery.

[0055] According to one embodiment of the present invention, there is an advantage in that the fuel cell device (2400) and the hydrogen supply device (2200) can be used separately.

[0056] As described above, the present disclosure has been explained by specific details and limited embodiments in this specification; however, this is provided merely to aid in a more comprehensive understanding of the present disclosure, and the present disclosure is not limited to the above embodiments. A person skilled in the art to which the present disclosure pertains can make various modifications and variations from this description.

[0057] Accordingly, the concept described in this specification is not limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept described in this specification.

Claims

Claim 1 A fuel cell system comprising: a hydrogen supply device; a fuel cell device that produces power using hydrogen supplied from the hydrogen supply device and supplies it to a load; and a controller that controls the hydrogen supply device and the fuel cell device, wherein the fuel cell device comprises a main fuel cell and an auxiliary fuel cell, each connected to the hydrogen supply device; and a driving device that operates the main fuel cell, and wherein the controller controls the auxiliary fuel cell so that power is supplied from the auxiliary fuel cell to the driving device during the initial operation of the main fuel cell. Claim 2 A fuel cell system according to claim 1, wherein the capacity of the main fuel cell is provided to be greater than the capacity of the auxiliary fuel cell. Claim 3 A fuel cell system according to claim 1, wherein the controller controls the hydrogen supply device such that when the initial operation is completed, the hydrogen is supplied to the main fuel cell but the supply of hydrogen to the auxiliary fuel cell is stopped. Claim 4 A fuel cell system according to claim 1, further comprising: a first converter provided between the main fuel cell and the load to supply power to the load; and a second converter provided between the auxiliary fuel cell, the driving device and the first converter to supply power to the driving device or the first converter, wherein the controller controls the second converter to supply power to the driving device during the initial operation and to supply surplus power to the first converter after the initial operation is completed. Claim 5 In claim 1, the hydrogen supply device comprises a pressure reducer that supplies produced hydrogen at reduced pressure to the main fuel cell and the auxiliary fuel cell, respectively, in a fuel cell system. Claim 6 In claim 5, the hydrogen supply device further comprises: a hydrogen reactor for obtaining a reactant by reacting a hydride, a catalyst, and water; a moisture remover connected to the hydrogen reactor for obtaining hydrogen by removing moisture from the reactant; and a buffer connected to the moisture remover for temporarily storing hydrogen supplied to the pressure reducer. Claim 7 A fuel cell system according to claim 6, comprising: a first pressure reducer connected to the buffer to reduce and supply hydrogen to the main fuel cell; and a second pressure reducer connected to the buffer to reduce and supply hydrogen to the auxiliary fuel cell, wherein the required pressure of the second pressure reducer is provided to be lower than the required pressure of the first pressure reducer. Claim 8 In claim 6, a fuel cell system comprising a moisture absorbent inside the moisture remover. Claim 9 In claim 6, the fuel cell system comprises a buffer, a pressure gauge for measuring the pressure of an internal space; and a relief valve provided to relieve the pressure of the internal space when the pressure measured by the pressure gauge exceeds a critical pressure. Claim 10 A fuel cell system according to any one of claims 1 to 9, wherein the hydrogen supply device and the fuel cell device are provided separably. Claim 11 A method for controlling a fuel cell system comprising a hydrogen supply device; a main fuel cell and an auxiliary fuel cell, each receiving hydrogen from the hydrogen supply device to produce power, wherein the method comprises a normal driving step of producing power through the main fuel cell and supplying power to a load; and an initial driving step prior to the normal driving step of producing power through the auxiliary fuel cell and supplying power to a driving device that operates the main fuel cell. Claim 12 A fuel cell system control method according to claim 11, wherein the capacity of the main fuel cell is provided to be greater than the capacity of the auxiliary fuel cell. Claim 13 A fuel cell system control method according to claim 11, wherein, during the normal operation phase, hydrogen is supplied to the main fuel cell but the supply of hydrogen to the auxiliary fuel cell is interrupted. Claim 14 A fuel cell system control method according to claim 11, wherein in the normal driving step, the surplus power of the auxiliary fuel cell is supplied to the load. Claim 15 A fuel cell system control method according to claim 11, wherein hydrogen at a first pressure is supplied to the auxiliary fuel cell during the initial driving stage and hydrogen at a second pressure is supplied to the main fuel cell during the normal driving stage, wherein the second pressure is provided to be greater than the first pressure.

Images