Fuel cell assembly

Abstract

The present disclosure relates to a fuel cell assembly. A fuel cell assembly (10) is provided with: a stack case (52) that houses a fuel cell (12); a high-voltage power supply device (19) that steps up power generated by the fuel cell (12) and outputs the stepped-up power to an external high-voltage power supply line (16); a power supply case (62) that is attached to the stack case (52), houses the high-voltage power supply device (19), and has a cooling mechanism (63) that cools heat of the high-voltage power supply device (19); and a low-voltage power supply device (24) that converts an input voltage supplied from an external low-voltage power supply line (18) into an internal voltage used to drive an auxiliary equipment type assembly, the low-voltage power supply device (24) being built into the power supply case (62), and a wiring board (66) of the low-voltage power supply device (24) being in surface contact with an inner surface of the power supply case (62).

Description

Technical Field

[0001] This disclosure relates to fuel cell components. Background Technology

[0002] In recent years, in order to ensure that more people have access to appropriate, reliable, sustainable and advanced energy, research and development are underway on fuel cells that contribute to energy efficiency (e.g., Patent Document 1).

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2023-173592 Summary of the Invention

[0004] The problem that the invention aims to solve However, in fuel cell-related technologies, ease of use is required as a universal product, applicable not only to passenger cars but also to trucks, stationary power supplies, and various other applications. To meet this ease-of-use requirement, the fuel cell and all auxiliary equipment components can be housed within a rectangular box-shaped area (envelope) of predetermined dimensions agreed upon with the application equipment manufacturer. The fuel cell assembly housed within such a box-shaped area does not interfere with the internal component configuration of the application equipment and can be easily mounted onto it.

[0005] On the other hand, fuel cell modules require power from the power system within the application device to power auxiliary equipment components. Since the application device's power system operates at various voltages, a low-voltage power supply unit is required within the fuel cell module to convert the power supplied from the application device into an internal voltage suitable for driving the auxiliary equipment components.

[0006] Fuel cell modules require tens to hundreds of amperes of current to drive auxiliary equipment components, which leads to increased heat generation in low-voltage power supply units. Commercially available low-voltage power supply units sometimes have excessively large heat sinks and other components, making them difficult to house within a box-like area.

[0007] This disclosure aims to solve the aforementioned problems by enabling the compact installation of low-voltage power supply units. Furthermore, it contributes to energy efficiency.

[0008] Solution for solving the problem This disclosure relates to a fuel cell assembly comprising: a stack housing housing a fuel cell; a high-voltage power supply device that boosts the voltage of the electricity generated by the fuel cell and outputs it to an external high-voltage power line; a power supply housing mounted on the stack housing, housing the high-voltage power supply device, and having a cooling mechanism for cooling the heat of the high-voltage power supply device; and a low-voltage power supply device that converts power supplied from an external low-voltage power line into an internal voltage for driving auxiliary equipment components, the low-voltage power supply device being built into the power supply housing, and the wiring substrate of the low-voltage power supply device being in surface contact with the inner surface of the power supply housing.

[0009] The effects of the invention According to this disclosure, the low-voltage power supply can be compactly mounted on the fuel cell assembly, and the low-voltage power supply can be housed within a cover.

[0010] The above-described objectives, features, and advantages should be readily understood from the following description of the embodiments, which are illustrated with reference to the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the low-voltage system of the fuel cell assembly involved in the implementation method.

[0012] Figure 2 This is a perspective view of the fuel cell assembly involved in the implementation method.

[0013] Figure 3 This is an explanatory diagram of the first mounting area and the second mounting area of ​​the fuel cell assembly's structural cover.

[0014] Figure 4 It is along Figure 2 A cross-sectional view of the power supply housing within the IV-IV line section. Furthermore, Figure 4 The cross-sections of parts other than the internal power system are omitted from the diagram.

[0015] Figure 5 It is along Figure 2 A partial cross-sectional view of the VV line. Furthermore, Figure 5 The cross-sections of parts other than the internal power system are omitted from the diagram. Detailed Implementation

[0016] like Figure 1As shown, the fuel cell assembly 10 of this embodiment includes a fuel cell 12, which supplies electricity generated by the fuel cell 12 to an application device 14. The application device 14 is, for example, a passenger car, a truck, or a stationary power source. The application device 14 includes a high-voltage power line 16 and a low-voltage power line 18. The high-voltage power line 16 supplies power to a drive motor or similar device that consumes a significant amount of electricity in the application device 14. The electricity from the fuel cell 12 is supplied to the high-voltage power line 16 via a high-voltage power supply unit 19 (VCU) described later.

[0017] The low-voltage power line 18 includes a power circuit 20. The power circuit 20 converts the power from the high-voltage power line 16 into a voltage suitable for the operation of the low-voltage devices in the application device 14 and supplies it to the low-voltage power line 18. Depending on the type of application device 14, the power circuit 20 supplies power such as DC 12V, 24V, or 48V. The low-voltage power line 18 includes a battery 22. The battery 22 supplies power to the fuel cell assembly 10 to the control devices and drive auxiliary equipment components required by the fuel cell assembly 10.

[0018] The fuel cell assembly 10 includes a low-voltage power supply unit 24, which converts power supplied from the low-voltage power line 18 into a predetermined internal voltage. The low-voltage power supply unit 24 may output, for example, 12V DC power as the internal voltage. The fuel cell assembly 10 includes a terminal block 26 and a relay assembly 28 to distribute power from the low-voltage power supply unit 24 to auxiliary equipment components and control devices of various parts.

[0019] Terminal block 26 is connected to low-voltage power supply unit 24 via first wiring 30. Terminal block 26 connects the first wiring 30 to a plurality of second wirings 32 toward relay assembly 28. Terminal block 26 is housed in terminal box 34 (see reference). Figure 2 ).

[0020] The relay assembly 28 is connected to the terminal block 26 via a second wiring 32. The relay assembly 28 connects the second wiring 32 to a third wiring 36 that faces the auxiliary equipment components of each part. Multiple relay assemblies 28 can be provided depending on the number of second wiring 32 and third wiring 36. Figure 1 In this example, the fuel cell assembly 10 includes two relay assemblies 28. Multiple second wirings 32 and third wirings 36 can be connected to each relay assembly 28. Each relay assembly 28 includes: a relay capable of disconnecting the electrical connection between the low-voltage power supply 24 and auxiliary equipment components; and a fuse that, in the event of leakage or the like, disconnects the electrical connection between the low-voltage power supply 24 and the third wirings 36. The relay assemblies 28 are housed in a relay housing 38 (see reference 1). Figure 2 ).

[0021] Devices connected to the third wiring 36 include, for example, an auxiliary equipment control device 39, a high-voltage power supply device 19, and a sensor type 40. The auxiliary equipment control device 39 controls the fuel gas supply unit 60 (see reference 60). Figure 2 The auxiliary equipment control device 39 is also connected to the valve group 44 and injector 46 of the fuel gas supply unit 60. The auxiliary equipment control device 39 and the injector 46 are connected via a fourth wiring 48.

[0022] The high-voltage power supply unit 19 includes a voltage conversion circuit that boosts the power generated by the fuel cell 12 to the voltage of the high-voltage power line 16 of the application device 14 and outputs it. The control unit of the high-voltage power supply unit 19 operates using the internal voltage supplied by the low-voltage power supply unit 24. The output terminals of the high-voltage circuit of the high-voltage power supply unit 19 are connected to the high-voltage power line 16.

[0023] The arrangement of the fuel cell assembly 10 will now be described. In this description, the terms "first direction," "second direction," and "vertical direction" will be used to illustrate the shape and positional relationships of the components. The first direction is the direction aligned with the stacking direction of the individual power-generating cells included in the fuel cell 12. The second direction is orthogonal to the first direction and is along the plane of the individual power-generating cells. The vertical direction is orthogonal to both the first and second directions.

[0024] like Figure 2 As shown, the fuel cell assembly 10 has a support frame 50. The support frame 50 is a flat plate extending along a first direction and a second direction, supporting the fuel cell 12. The support frame 50 has a connecting portion 54, the side of which protrudes outward relative to the stack housing 52 of the fuel cell 12 in the second direction. The connecting portion 54 is used to mount the fuel cell assembly 10 to a frame or the like of the application device 14.

[0025] like Figure 3 As shown, a first mounting area 56 is provided on the support frame 50, which forms part of the enclosure. A second mounting area 58 is provided below the support frame 50, which forms another part of the enclosure. The enclosure is composed of the first mounting area 56 and the second mounting area 58. The first mounting area 56 is a cuboid box-shaped area formed along the first direction, the second direction, and the vertical direction. The first mounting area 56 is larger than the stack housing 52 of the fuel cell 12. Auxiliary equipment components are mounted in the gap between the first mounting area 56 and the stack housing 52. In addition to mounting the fuel cell 12, the first mounting area 56 also mounts a fuel gas supply unit 60, an auxiliary equipment control device 39, a high-voltage power supply device 19, a low-voltage power supply device 24, a terminal block 26, and a relay box 38.

[0026] The second mounting area 58 is a cuboid box-shaped area extending downwards from the support frame 50 along the first direction, the second direction, and the vertical direction. The dimensions of the second mounting area 58 in the first and second directions are the same as those of the first mounting area 56, while the vertical dimension of the second mounting area 58 is smaller than that of the first mounting area 56. The second mounting area 58 houses auxiliary equipment for the oxidant gas system, including the compressor, heat exchanger, humidifier, gas-liquid separator, and other oxidant gas supply unit 59, as well as a portion of the fuel gas supply unit 60.

[0027] The fuel cell 12 is housed in a cuboid stack housing 52 formed along a first direction, a second direction, and a vertical direction. The stack housing 52 has a first side surface 52a at one end in the first direction, a second side surface 52b at the other end in the first direction, a third side surface 52c at one end in the second direction, and a fourth side surface 52d at the other end in the second direction. A fuel gas supply unit 60 is mounted between the second side surface 52b of the stack housing 52 and the first mounting area 56.

[0028] The vertical dimension of the stack shell 52 is smaller than the vertical dimension of the first mounting area 56. High-voltage power supply unit 19 and low-voltage power supply unit 24, which generate significant heat, are centrally located on the upper part of the stack shell 52.

[0029] like Figure 4 as well as Figure 5 As shown, the low-voltage power supply unit 24 and the high-voltage power supply unit 19 are housed inside the power supply housing 62. The power supply housing 62 covers the upper part of the stack housing 52. A waterproof seal is provided at the contact portion between the power supply housing 62 and the stack housing 52, forming a containment space inside the power supply housing 62 to prevent water from entering. The power supply housing 62 has an upper surface portion 62a, a first side wall 62b, a second side wall 62c, a third side wall 62d, and a fourth side wall 62e. The upper surface portion 62a forms the upper end of the power supply housing 62. In the upper surface portion 62a, the portion bulging upwards is located at approximately the same height as the upper end of the first mounting region 56.

[0030] The first sidewall 62b, the second sidewall 62c, the third sidewall 62d, and the fourth sidewall 62e extend downward from the side of the upper surface portion 62a and are tightly engaged with the stack shell 52. The first sidewall 62b is the end portion of one side in a first direction and is located above the first side surface 52a of the stack shell 52. The first sidewall 62b and the first side surface 52a are substantially coplanar. The second sidewall 62c is the end portion of the other side in the first direction and is located above the second side surface 52b of the stack shell 52. The second sidewall 62c and the second side surface 52b are substantially coplanar.

[0031] The third sidewall 62d is located on one side of the power source housing 62 in the second direction and is substantially coplanar with the third sidewall 52c of the stack housing 52. The fourth sidewall 62e is located on the other side in the second direction and is substantially coplanar with the fourth sidewall 52d of the stack housing 52.

[0032] The power supply housing 62 is made of a metal with excellent thermal conductivity, such as aluminum alloy. The heat-generating components of the high-voltage power supply device 19, which generate significant heat, make surface contact with the upper surface 62a of the power supply housing 62 via a thermally conductive material (such as thermal grease or the thermally conductive sheet 68 shown in the example). Figure 4 As shown, a cooling mechanism 63 is provided on the upper surface 62a of the power supply housing 62. The cooling mechanism 63 includes a refrigerant flow path 63a for cooling heat-generating components such as the high-voltage power supply unit 19. At least a portion of the refrigerant flow path 63a of the cooling mechanism 63 is configured to cover the top of the high-voltage power supply unit 19. A refrigerant such as water flows through the refrigerant flow path 63a. The refrigerant flow path 63a, along with the cooling water of the fuel cell 12, is cooled by an external radiator or the like. The cooling mechanism 63 may also include heat sink fins.

[0033] The highest portion (first portion) of the upper surface 62a of the power supply housing 62 bulges out from the upper end of the stack housing 52 at a first height. The vertical position of the highest portion of the upper surface 62a is approximately the same as the upper end of the first mounting region 56. A recess 64 (second portion) is formed in a part of the upper surface 62a of the power supply housing 62, which is lower than the upper end of the first mounting region 56. The recess 64 bulges out from the upper end of the stack housing 52 at a second height lower than the first height. The recess 64 is located in the power supply housing 62 near the third sidewall 62d.

[0034] Additionally, a power connector 65 for connecting to the low-voltage power line 18 of the application device 14 is provided at a predetermined location on the upper surface 62a of the power housing 62. The power connector 65 is connected to the low-voltage power supply device 24 via power wiring 65a.

[0035] The low-voltage power supply device 24 is housed inside the recess 64. Compared to the high-voltage power supply device 19, the low-voltage power supply device 24 generates a smaller voltage and current, and is therefore smaller in size. Thus, the low-voltage power supply device 24 can be accommodated inside the recess 64.

[0036] like Figure 4 As shown, the low-voltage power supply device 24 includes a wiring substrate 66 and electronic components mounted on a first surface 66a of the wiring substrate 66. The second surface 66b of the wiring substrate 66 is formed as a flat surface.

[0037] Through holes (not shown) are formed at multiple locations on the wiring substrate 66. Fastening components such as screws are screwed into these through holes, thereby mounting the wiring substrate 66 to the upper surface of the power supply housing 62. The second surface 66b of the wiring substrate 66 is mounted to the power supply housing 62 via a flexible heat-conducting sheet 68.

[0038] Heat from the heat-generating components of the low-voltage power supply unit 24 is transferred via the wiring board 66 to the power supply housing 62, which has a cooling mechanism 63, thereby being dissipated efficiently. Therefore, in the fuel cell assembly 10 of this embodiment, it is not necessary to install large heat dissipation components such as heat sinks on the low-voltage power supply unit 24, and the low-voltage power supply unit 24 can be compactly mounted.

[0039] Additionally, a terminal box 34 is disposed on the recess 64. The terminal box 34 is a housing that accommodates the terminal block 26. The terminal box 34 has a vertical dimension smaller than the vertical depth of the recess 64. Therefore, the sum of the second height of the recess 64 and the height of the terminal box 34 is equal to or less than the first height. That is, the terminal box 34 is disposed in the recess 64 of the power supply housing 62, and the upper end of the terminal box 34 does not protrude upward from the highest part (first part) of the upper surface portion 62a of the power supply housing 62.

[0040] Alternatively, multiple terminal boxes 34 can be provided depending on the number of second wirings 32 connected to the relay box 38. The terminal boxes 34 are located above the low-voltage power supply unit 24 within the recess 64. The terminal boxes 34 and the low-voltage power supply unit 24 face each other, sandwiching the power supply housing 62. This configuration minimizes the length of the first wiring 30 connecting the low-voltage power supply unit 24 to the terminal boxes 34, thereby suppressing voltage drops caused by the wiring impedance of the first wiring 30.

[0041] like Figure 2 As shown, multiple second wirings 32 extend from the terminal box 34 toward the first sidewall 62b of the power supply housing 62. The second wirings 32 are connected to a relay box 38. The relay box 38 is mounted on the first sidewall 62b of the power supply housing 62. The upper part of the relay box 38 is configured to be openable and closable, and to allow for replacement of the internal fuse. For easy fuse replacement, the relay box 38 is positioned near the upper end of the first mounting area 56.

[0042] In this embodiment, the fuel cell assembly 10 has two relay boxes 38. The relay box 38 located on the path supplying power to the auxiliary equipment control device 39 is hereinafter referred to as the first relay box 38A. The first relay box 38A is located near the third sidewall 62d of the power supply housing 62. The first relay box 38A is positioned above the auxiliary equipment control device 39 mounted on the first sidewall 52a. The first relay box 38A is connected to the auxiliary equipment control device 39 via a third wiring 36 extending vertically. Positioning the first relay box 38A in such a manner minimizes the path length of the third wiring 36, thereby suppressing voltage drops caused by wiring impedance in the third wiring 36.

[0043] The relay box 38 and the auxiliary equipment control device 39 are components for controlling high current, and therefore are preferably located away from the fuel gas supply section 60 where flammable fuel gas leakage may occur. Therefore, the relay box 38 and the auxiliary equipment control device 39 are disposed on the first side 52a of the reactor shell 52. The first side 52a is the part furthest from the second side 52b where the fuel gas supply section 60 is located. The auxiliary equipment control device 39 is disposed near the center in the vertical direction of the reactor shell 52. Furthermore, the auxiliary equipment control device 39 is disposed on the first side 52a at a position as close as possible to the third side 52c.

[0044] Auxiliary equipment control device 39 is housed in control box 39a. Multiple fourth wirings 48 extend from control box 39a toward valve assembly 44 of fuel gas supply unit 60 (see reference). Figure 1 And the injector 46 extends. The injector 46 requires a relatively large current to operate and is difficult to operate properly when the voltage drops. Therefore, for the fourth wiring 48 that connects the auxiliary equipment control device 39 to the injector 46, it is desirable to minimize the voltage drop caused by wiring impedance.

[0045] Therefore, the control box 39a is also positioned closest to the third side 52c within the first side 52a of the stack housing 52. Furthermore, a fourth wiring 48 extending from the auxiliary equipment control device 39 extends along the first direction on the third side 52c. A portion of the fourth wiring 48 bends on the second side 52b and connects to the injector 46. The injector 46 is positioned near the upper end of the third side 52c within the second side 52b. Thus, this configuration of the fourth wiring 48 allows for a short path connection between the auxiliary equipment control device 39 and the injector 46, thereby suppressing voltage drops caused by internal impedance.

[0046] Furthermore, the low-voltage power supply unit 24, terminal box 34, relay box 38, and auxiliary equipment control unit 39 are positioned near the third side 52c. This shortens the length of the wiring from the low-voltage power supply unit 24 to the injector 46, allowing sufficient drive current to be supplied to the injector 46 without excessively increasing the wire diameter of the first wiring 30, second wiring 32, third wiring 36, and fourth wiring 48. Consequently, the fuel cell assembly 10 can accommodate smaller wire diameters for the first wiring 30, second wiring 32, third wiring 36, and fourth wiring 48, enabling compact wiring configuration.

[0047] A fuel gas supply section 60 is provided on the side of the second side 52b of the stack casing 52. The fuel gas supply section 60 includes a gas-liquid separator, a circulation piping, an injector 46, an ejector, and valves. The circulation piping forms a flow path connecting the anode discharge end to the anode supply end of the fuel cell 12, allowing hydrogen gas, which serves as fuel gas, to circulate. The gas-liquid separator is installed in the circulation piping to separate and remove moisture from the unused hydrogen gas discharged from the fuel cell 12. The ejector is a jet pump installed in the circulation piping, utilizing the flow of high-pressure hydrogen gas ejected from the injector 46 to circulate hydrogen gas inside the circulation piping. The injector 46 is equipped with a solenoid valve for blowing hydrogen gas into the ejector. The injector 46 blows hydrogen gas supplied from a high-pressure hydrogen cylinder into the ejector.

[0048] The connector of the injector 46 is located on the third side 52c and is connected to the auxiliary equipment control device 39 via the fourth wiring 48.

[0049] As described above, the fuel cell assembly 10 of this embodiment enables the compact mounting of the low-voltage power supply unit 24. Furthermore, by separating the terminal box 34 and the relay box 38, they can be efficiently mounted within the limited gap between the first mounting area 56 and the stack housing 52. Additionally, the auxiliary equipment control device 39 can be placed in a safe location, and the wiring path from the low-voltage power supply unit 24 through the auxiliary equipment control device 39 to the injector 46 can be shortened. This configuration reduces wiring size, thereby enabling compact wiring mounting.

[0050] The following notes are also disclosed regarding the above-described embodiments.

[0051] (Postscript 1) The fuel cell assembly 10 disclosed herein includes: a stack housing 52 that houses a fuel cell 12; a high-voltage power supply device 19 that boosts the voltage of the generated power from the fuel cell and outputs it to an external high-voltage power line 16; a power supply housing 62 that is mounted on the stack housing, houses the high-voltage power supply device, and has a cooling mechanism 63 for cooling the heat of the high-voltage power supply device; and a low-voltage power supply device 24 that converts power supplied from an external low-voltage power line 18 into an internal voltage for driving auxiliary equipment components, the low-voltage power supply device being built into the power supply housing, and the wiring substrate 66 of the low-voltage power supply device being in surface contact with the inner surface of the power supply housing.

[0052] The aforementioned fuel cell assembly can be compactly integrated with a low-voltage power supply device.

[0053] (Postscript 2) According to Appendix 1, the fuel cell assembly may also have the power housing having: a first portion bulging out of the stack housing at a first height; and a second portion bulging out of the stack housing at a second height, wherein the high-voltage power supply device is housed in the first portion, and the low-voltage power supply device is mounted on the inner surface of the second portion. This fuel cell assembly can provide space in the second portion to accommodate components of the power system, thereby enabling compact mounting of the power system components.

[0054] (Note 3) According to Appendix 2, the fuel cell assembly may also further include: a terminal block 26 that connects multiple wirings, which are connected to the auxiliary equipment components, to the low-voltage power supply; and a relay assembly 28 that electrically connects or disconnects the auxiliary equipment components from the low-voltage power supply. The terminal box 34 housing the terminal block and the relay box 38 housing the relay assembly are separate and disposed in mutually isolated positions. This fuel cell assembly can compactly mount the terminal block and the relay assembly.

[0055] (Note 4) According to Appendix 3, the fuel cell assembly may also have the terminal box disposed in the second part, wherein the sum of the height of the terminal box and the second height is equal to or less than the first height. This fuel cell assembly can compactly mount the terminal box.

[0056] (Note 5) According to Appendix 4, the fuel cell assembly may also have the relay box mounted on the side of the power source housing and bulging laterally relative to the first side surface 52a of the stack housing, located above the stack housing. This fuel cell assembly positions the relay box in a location easily accessible from above, thus providing excellent operability for tasks such as fuse replacement.

[0057] (Note 6) According to Appendix 5, the fuel cell assembly may also further include: an auxiliary equipment control device 39 connected to the low-voltage power supply via the relay box and the terminal block to drive the auxiliary equipment components; and a control box 39a housing the auxiliary equipment control device, the control box being mounted below the relay box on the first side of the stack housing. This fuel cell assembly can shorten the wiring distance to the auxiliary equipment control device, thereby suppressing voltage drops caused by wiring impedance.

[0058] (Note 7) According to Appendix 6, the fuel cell assembly may also include an injector 46 mounted on a second side 52b of the stack housing opposite to the first side, injecting fuel gas into the fuel cell. A fourth wiring 48 connecting the injector to the auxiliary equipment control device is configured to surround the side of the stack housing. This fuel cell assembly allows for a shorter wiring distance from the low-voltage power supply to the injector, thus enabling the use of smaller diameter wiring and allowing for compact wiring installation.

[0059] (Postscript 8) According to Appendix 6 or 7, the fuel cell assembly may also include a support frame 50 that supports the stack housing from below, with the power housing, terminal block, relay box, and control box disposed within a first mounting area 56 extending upward toward the support frame. This fuel cell assembly can be mounted on application equipment without affecting the component layout of the application equipment, thus enabling its application in a variety of purposes.

[0060] This disclosure is described in detail, but it is not limited to the embodiments described above. Various additions, substitutions, modifications, and partial deletions can be made to these embodiments without departing from the spirit of this disclosure, or from the spirit of this disclosure derived from the claims and their equivalents. Furthermore, these embodiments can also be combined. For example, the order of each action and each process in the above embodiments is only one example and is not limited thereto. The same applies to the use of numerical values ​​or mathematical formulas in the description of the above embodiments.

Claims

1. A fuel cell assembly, comprising: The stack casing, which houses the fuel cell; A high-voltage power supply device that boosts the voltage of the electricity generated by the fuel cell and outputs it to an external high-voltage power line; A power supply housing, which is mounted on the stack housing, houses the high-voltage power supply unit, and has a cooling mechanism for cooling the heat of the high-voltage power supply unit; as well as A low-voltage power supply unit that converts power supplied from an external low-voltage power line into an internal voltage for driving auxiliary equipment components. The low-voltage power supply device is built into the power supply housing, and the wiring board of the low-voltage power supply device is in surface contact with the inner surface of the power supply housing.

2. The fuel cell assembly according to claim 1, characterized in that, The power supply housing has: a first portion that bulges out of the stack housing at a first height; and a second portion that bulges out of the stack housing at a second height. The high-voltage power supply device is housed in the first part, and the low-voltage power supply device is mounted on the inner surface of the second part.

3. The fuel cell assembly of claim 2, wherein It also has: A terminal block that connects multiple wirings, which are connected to the auxiliary equipment components, to the low-voltage power supply unit; and A relay assembly that electrically connects or disconnects the auxiliary equipment components from the low-voltage power supply. The terminal box housing the terminal block and the relay box housing the relay assembly are separate and located in separate positions.

4. The fuel cell assembly according to claim 3, characterized in that, The terminal box is disposed in the second part, and the sum of the height of the terminal box and the second height is equal to or lower than the first height.

5. The fuel cell assembly according to claim 4, characterized in that, The relay box is mounted on the side of the power supply housing and bulges laterally relative to the first side of the stack housing, located above the stack housing.

6. The fuel cell assembly according to claim 5, characterized in that, It also includes: an auxiliary equipment control device connected to the low-voltage power supply via the relay box and the terminal block to drive the auxiliary equipment components; and a control box housing the auxiliary equipment control device. The control box is located below the relay box and is mounted on the first side of the stack housing.

7. The fuel cell assembly according to claim 6, characterized in that, It also includes an injector mounted on a second side of the stack shell opposite to the first side, for injecting fuel gas into the fuel cell. The fourth wiring connecting the injector to the auxiliary equipment control device is configured to surround the side of the stack shell.

8. The fuel cell assembly according to claim 6 or 7, characterized in that, It includes a support frame that supports the stack shell from below. The power supply housing, the terminal block, the relay box, and the control box are disposed in a first mounting area extending above the support frame.

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