Water exposure suppression structure for fuel cell modules

Abstract

In a water-reducing structure for a fuel cell module, the reduction in axial force of the retaining member that holds the lid to the outer plate of the fuel cell module is suppressed. [Solution] The water intrusion suppression structure for the fuel cell module FCM comprises a lid Lh that covers an opening OPh provided in the outer plate P of the fuel cell module FCM, an elastic sealing member Wh provided between the outer plate P and the lid Lh, a holding member that holds the lid Lh to the outer plate P via the sealing member Wh by axial force, and a rigid body RG interposed between the outer plate P and the lid Lh.

Description

Technical Field

[0001] The present invention relates to a water intrusion prevention structure for a fuel cell module.

Background Art

[0002] As a water intrusion prevention structure for a fuel cell module, there is one including a lid portion that covers an opening provided in an outer plate of the fuel cell module, a sealing member provided between the outer plate and the lid portion and having elasticity, and a holding member that holds the lid portion to the outer plate via the sealing member. In the water intrusion prevention structure of the fuel cell module configured in this way, when the sealing member contracts between the lid portion and the outer plate by the holding member, the sealing member tries to return to its original state, so that the sealing member adheres to the lid portion and the sealing member adheres to the outer plate, and the joint between the lid portion and the outer plate can be filled, and water intrusion from the outside of the fuel cell module into the opening can be suppressed. Further, in the water intrusion prevention structure of the fuel cell module configured in this way, an axial force can be generated in the holding member by the repulsive force from the sealing member to the lid portion or the outer plate. As a related technology, there is Patent Document 1.

[0003] However, in the above-described water intrusion prevention structure of the fuel cell module, when a creep phenomenon occurs in the sealing member due to aging deterioration and the sealing member further contracts, the repulsive force from the sealing member to the lid portion or the outer plate decreases, and the axial force of the holding member may decrease. And the decrease in the axial force of the holding member may cause a decrease in the performance of the fuel cell module due to the decrease in the water intrusion prevention function, which hinders the extension of the life of the fuel cell module.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] One aspect of the present invention is to suppress a decrease in the axial force of a retaining member that holds a cover portion covering an opening provided on the outer plate of a fuel cell module to the outer plate in a water-reducing structure for a fuel cell module. [Means for solving the problem]

[0006] One embodiment of the present invention is a water-reducing structure for a fuel cell module, which comprises a first lid that covers a first opening provided on the outer plate of the fuel cell module, an elastic sealing member provided between the outer plate and the first lid, a first holding member that holds the first lid to the outer plate via the sealing member by axial force, and a rigid body interposed between the outer plate and the first lid.

[0007] In this way, because a rigid body is interposed between the outer plate and the lid, if the amount of shrinkage of the rigid body per unit time due to aging deterioration is smaller than the amount of shrinkage of the sealing member per unit time due to aging deterioration, it is possible to suppress a decrease in the axial force of the first retaining member.

[0008] Furthermore, the retaining member may be a fastening member that generates the axial force by being inserted into screw holes provided in the first lid and the outer plate, respectively, and the rigid body may be arranged around the fastening member.

[0009] Furthermore, the rigid body may be a washer through which the first retaining member passes, and the sealing member may have a relief portion between the lid and the outer plate for interposing the first retaining member and the washer.

[0010] The first opening may also be an opening in a fuse box where a fuse is located.

[0011] Furthermore, the first retaining member comprises a shaft portion and a head portion provided at one end of the shaft portion, wherein the shaft portion passes through at least a lid side hole provided in the first lid portion and an outer plate side hole provided in the outer plate, and generates the axial force by sandwiching the first lid portion, the sealing member, the rigid body, and the outer plate between the head portion and the shaft portion, and in a side view of the first retaining member and the rigid body, the outer diameter of the head portion may be larger than the inner diameter of the rigid body, and the outer diameter of the rigid body may be larger than the outer diameter of the head portion.

[0012] This allows the rigid body to reliably generate the axial force of the first holding member.

[0013] Furthermore, the sealing member may be formed to cover the entire surface of the first lid, except for the hole through which the first retaining member passes.

[0014] This makes it easier to assemble the sealing components.

[0015] Furthermore, the water ingress suppression structure of the fuel cell module may include a second lid that covers a second opening provided on the outer panel, and a second retaining member that holds the first lid to the outer panel, wherein the second opening is the opening of a box in which a plug for interrupting the electrical wiring to which the fuse is connected is located when the fuse is replaced, the first retaining member may be a member that allows the first lid to be attached and detached using a tool, and the second retaining member may be a member that allows the second lid to be attached and detached without using a tool.

[0016] This prevents users from replacing fuses before they cut off the electrical wiring. [Effects of the Invention]

[0017] According to the present invention, in a water-reducing structure for a fuel cell module, it is possible to suppress the reduction in axial force of a retaining member that holds a lid portion covering an opening provided in the outer plate of the fuel cell module to the outer plate. [Brief explanation of the drawing]

[0018] [Figure 1] It is a diagram showing an example of a fuel cell module of an embodiment. [Figure 2] It is a diagram showing a water suppression structure of a fuel cell module of an embodiment. [Figure 3] It is a diagram showing a lid portion and a seal member. [Figure 4] It is a diagram showing an example of attachment of a rigid body. [Figure 5] It is a diagram showing an example of attachment of a seal member. [Figure 6] It is a diagram showing an example of attachment of a holding member. [Figure 7] It is a sectional view taken along the line A-A shown in FIG. 2. [Figure 8] It is a diagram showing another example of a holding member. [Figure 9] It is a diagram showing another example of a rigid body.

Mode for Carrying Out the Invention

[0019] The embodiments will be described in detail below based on the drawings. Note that the X-axis, Y-axis, and Z-axis in each figure are shown for the purpose of defining the plane and direction in the water suppression structure of the illustrated fuel cell module. Also, the X-axis, Y-axis, and Z-axis are orthogonal to each other and form a right-handed system. In addition, the aspect ratios in each figure and the size relationships between the members are only schematically shown and do not necessarily match the aspect ratios and size relationships in the water suppression structure of the actually manufactured fuel cell module. Also, for the sake of convenience in explanation, it is assumed that there are cases where the size relationships between the members are exaggerated.

[0020] FIG. 1 is a diagram showing an example of a fuel cell module of an embodiment.

[0021] The fuel cell module (FCM) shown in Figure 1 is installed in industrial vehicles such as forklifts, towing tractors, or automated guided vehicles (AGVs), and supplies power to the load Lo installed in those industrial vehicles. In this configuration, the load Lo is, for example, an inverter circuit that drives a cargo handling device or a drive motor. The fuel cell unit 1 may also be installed in stationary generators such as industrial stationary generators, household stationary generators, or emergency stationary generators. In this configuration, the load Lo is, for example, industrial machinery or household appliances.

[0022] Furthermore, the fuel cell module (FCM) comprises a fuel cell (FC) as the main unit and several auxiliary units for generating electricity with the fuel cell (FC).

[0023] In other words, the fuel cell module (FCM) includes, for example, a hydrogen tank (HT) and an injector (INJ) as auxiliary components for the fuel gas system.

[0024] Furthermore, the fuel cell module (FCM) includes, for example, an air compressor (ACP) as an oxidizer gas system auxiliary device.

[0025] Furthermore, the fuel cell module (FCM) includes, as electrical auxiliary components, a DC-DC converter (CNV), a fuse (HS), a plug (PL), a power storage device (B), a current sensor (Si), and a voltage sensor (Sv).

[0026] Furthermore, the fuel cell module (FCM) is equipped with a control circuit (Cnt) that controls the power generation of the fuel cell (FC).

[0027] A fuel cell (FC) consists of multiple fuel cell cells connected in series with each other, and generates electricity through an electrochemical reaction between hydrogen contained in hydrogen gas and oxygen contained in air.

[0028] The hydrogen tank (HT) is a storage container for hydrogen gas. The hydrogen gas stored in the hydrogen tank (HT) is supplied to the fuel cell (FC) via the injector (INJ).

[0029] The injector (INJ) adjusts the flow rate of hydrogen gas supplied to the fuel cell (FC).

[0030] The air compressor (ACP) compresses air and supplies that compressed air to the fuel cell (FC).

[0031] The DC-DC converter CNV is connected downstream of the fuel cell FC and converts the voltage output from the fuel cell FC to a predetermined voltage. The power output from the DC-DC converter CNV is supplied to various auxiliary equipment such as the air compressor ACP, load Lo, and energy storage device B.

[0032] Fuse HS is connected to the electrical wiring W that connects the DC-DC converter CNV and the energy storage device B, and prevents a relatively large current from flowing through that electrical wiring W.

[0033] Plug PL is a user-removable disconnection switch installed in the electrical wiring W connecting fuse HS and energy storage device B. When Plug PL is removed from the electrical wiring W by the user, the electrical wiring W connecting fuse HS and energy storage device B is electrically disconnected, preventing current from flowing from the DC-DC converter CNV to energy storage device B via fuse HS, and preventing current from flowing from energy storage device B to load Lo via fuse HS.

[0034] Energy storage device B is composed of lithium-ion capacitors and the like, and is connected between the DC-DC converter CNV and the load Lo via fuse HS and plug PL.

[0035] The control circuit Cnt, composed of a microcomputer and other components, controls the power generation of the fuel cell FC. For example, when controlling the power generation of the fuel cell FC, the control circuit Cnt changes the target power generation power according to the comparison result between the charge rate of the energy storage device B (the ratio of remaining capacity to the full charge capacity of the energy storage device B [%]) and a threshold. It also controls the operation of each auxiliary component (such as the injector INJ and air compressor ACP) so that the power generation power of the fuel cell FC follows the target power generation power through PI (Proportional-Integral) control, etc. The control circuit Cnt determines the charge rate of the energy storage device B from the current detected by the current sensor Si and the voltage detected by the voltage sensor Sv.

[0036] Furthermore, the fuel cell module (FCM) comprises a housing H that houses the fuel cell (FC) and various auxiliary equipment, and an outer panel P made of sheet metal or the like that covers the opening of the housing H.

[0037] Furthermore, the fuel cell module FCM comprises a fuse box HB in which a fuse HS is housed, a cover Lh (first cover) made of sheet metal or the like that covers the opening OPh (first opening) of the fuse box HB, a plug box PB in which a plug PL is housed, and a cover Lp (second cover) made of sheet metal or the like that covers the opening OPp (second opening) of the plug box PB. The opening OPh of the fuse box HB and the opening OPp of the plug box PB are provided at arbitrary locations on the outer panel P. When the user inspects or replaces the fuse HS, the cover Lp is removed from the outer panel P and the plug PL is unplugged from the electrical wiring W, and then the cover Lh is removed from the outer panel P to inspect or replace the fuse HS.

[0038] Here, we consider a scenario where the fuel cell module (FCM) is exposed to water due to rain or factory wastewater.

[0039] In this case, there is a risk that water may enter the fuse box HB from the outside of the fuel cell module FCM through the joint between the cover Lh and the outer panel P.

[0040] Therefore, in the water intrusion suppression structure of the fuel cell module FCM of this embodiment, an elastic sealing member such as EPDM (ethylene propylene rubber), natural rubber, or synthetic rubber is provided between the lid Lh and the outer plate P in order to suppress water from entering the inside of the fuse box HB.

[0041] As described above, in the water intrusion suppression structure of the fuel cell module FCM of this embodiment, an elastic sealing member is provided between the lid Lh and the outer plate P. When the sealing member interposed between the lid Lh and the outer plate P contracts due to the holding member described later holding the lid Lh to the outer plate P via the sealing member, a repulsive force is generated from the sealing member to the lid Lh and the outer plate P due to the force of the sealing member trying to return to its original state. As a result of these repulsive forces, the sealing member adheres tightly to the lid Lh and also to the outer plate P, thereby suppressing the intrusion of water from the outside of the fuel cell module FCM into the inside of the fuse box HB. This also improves the waterproofness of components located below the fuse box HB.

[0042] Figure 2 shows an example of a water intrusion suppression structure for a fuel cell module (FCM) of the embodiment.

[0043] In the water-suppression structure shown in Figure 2, a sealing member Wh is provided between the lid Lh and the outer plate P. The sealing member Wh is made of, for example, foamed silicone rubber, fluororubber, acrylic rubber, or nitrile rubber, or foamed polyethylene, polypropylene, or polyurethane. Similarly, a sealing member may also be provided between the lid Lp and the outer plate P.

[0044] Furthermore, in the water-suppression structure shown in Figure 2, the lid Lp is held to the outer plate P via a sealing member Wh using retaining members (fastening members) Hh (first retaining members) at both ends of the lid Lh in the longitudinal direction. In addition, the lid Lp is held to the outer plate P using a hinge HG at one end of the lid Lp in the longitudinal direction, and the lid Lp is held to the outer plate P using a retaining member Hp (second retaining member) at the other end of the lid Lp in the longitudinal direction.

[0045] For example, consider a case where the retaining member Hp is made of a component that allows the lid Lp to be attached and detached (opened and closed) without the use of tools (e.g., a knob), and the retaining member Hh is made of a component that allows the lid Lh to be attached and detached using tools (e.g., a bolt). In other words, consider a case where the retaining member Hp is made of a component that allows the lid Lp to be attached and detached relatively easily, and the retaining member Hh is made of a component that requires the lid Lh to be attached and detached relatively cumbersomely.

[0046] Thus, when the retaining member Hh is made of a component that requires relatively complicated removal and attachment of the lid Lh, the lid Lh becomes more difficult to remove and attach compared to the lid Lp. This reduces the occurrence of the fuse HS being replaced before the lid Lh is removed and the plug PL is removed (a work error).

[0047] Figure 3(a) shows the lid Lh shown in Figure 2 as viewed from the negative side in the Z-axis direction, and Figure 3(b) shows the sealing member Wh shown in Figure 2 as viewed from the negative side in the Z-axis direction.

[0048] The lid portion Lh shown in Figure 3(a) is provided with side holes THh at both ends in the longitudinal direction, through which the retaining member Hh passes. The size and shape of the side holes THh are not particularly limited, as long as the head portion HD of the retaining member Hh (described later) cannot pass through, but the shaft portion SF of the retaining member Hh (described later) can pass through.

[0049] Furthermore, the sealing member Wh shown in Figure 3(b) has almost the same shape as the lid portion Lh in the XY axis plane, and side holes THw for the sealing member are provided at both ends in the longitudinal direction to avoid the retaining member Hh and the rigid body RG, which will be described later.

[0050] In other words, the sealing member Wh is formed to cover the entire surface of the lid portion Lh, except for the sealing member side hole THw. When the sealing member Wh is formed in this way, for example, compared to when the sealing member Wh is formed in an annular shape, the sealing member Wh itself is less likely to deform, making it easier to hold, and the number of positioning points during assembly can be reduced, making it easier to assemble the sealing member Wh to the lid portion Lh.

[0051] Furthermore, the side hole THw of the sealing member functions as a clearance for interposing the retaining member Hh and a rigid body (e.g., a washer) described later between the lid Lh and the outer plate P. The size and shape of the side hole THw of the sealing member are not particularly limited, as long as it is possible to pass the shaft portion SF of the retaining member Hh described later through it and to accommodate the rigid body RG described later.

[0052] Furthermore, as described above, by holding the lid Lh to the outer plate P via the sealing member Wh using the holding member Hh, when the sealing member Wh interposed between the lid Lh and the outer plate P is compressed and contracts, the sealing member Wh tries to return to its original state, generating a repulsive force from the sealing member Wh to the lid Lh and the outer plate P. These repulsive forces can generate an axial force (holding force) in the holding member Hh.

[0053] Here, we assume that in a state where the lid Lh is held to the outer plate P via the sealing member Wh by the retaining member Hh, the sealing member Wh shrinks further due to deterioration over time.

[0054] In this case, the repulsive force from the sealing member Wh to the lid Lh and outer plate P may decrease, potentially reducing the axial force (holding force) of the retaining member Hh.

[0055] Therefore, in the water intrusion suppression structure of the fuel cell module FCM of this embodiment, a rigid body is interposed between the lid Lh and the outer plate P. The rigid body is made of, for example, iron, stainless steel, silicon, rubber, or plastic, and the material of the rigid body is not particularly limited as long as the amount of shrinkage of the rigid body per unit time due to aging deterioration is less than the amount of shrinkage of the sealing member Wh per unit time due to aging deterioration.

[0056] Thus, in the water intrusion suppression structure of the fuel cell module FCM of this embodiment, a rigid body is interposed between the lid Lh and the outer plate P, and an axial force is generated in the holding member Hh by utilizing not only the repulsive force of the sealing member Wh but also the repulsive force of the rigid body. Therefore, even if the repulsive force of the sealing member Wh decreases due to aging, it is possible to suppress the decrease in the axial force (holding force) of the holding member Hh.

[0057] In other words, in the water-suppression structure of the fuel cell module (FCM) of this embodiment, the sealing member Wh provides a waterproofing function, and the rigid body provides a function to suppress axial force reduction, thus achieving both watertightness and strength of the fastening part. As a result, the performance degradation of the fuel cell module (FCM) can be suppressed, and the lifespan of the fuel cell module (FCM) can be extended.

[0058] Figure 4 shows an example of how to attach a rigid body.

[0059] In the example shown in Figure 4, the rigid body RG and the lid Lh are superimposed so that the lid side hole THh and the rigid body side hole THr coincide with each other. Then, the rigid body RG is attached to the lid Lh by welding any two of the contact points between the lid Lh and the rigid body RG (for example, P1 and P2 shown in Figure 4). The rigid body RG shown in Figure 4 is a metal washer. The rigid body RG may also be attached to the outer plate P. The rigid body RG may also be attached to the lid Lh or outer plate P by joining methods other than welding, such as joining methods using double-sided tape or adhesive. Furthermore, the rigid body RG does not have to be attached to the lid Lh or outer plate P as long as it is positioned around the retaining member Hh. In addition, the material and shape of the rigid body RG and the sealing member Wh may be designed so that the thickness of the sealing member Wh after shrinkage before aging is the same or approximately the same as the thickness of the rigid body RG.

[0060] Figure 5 shows an example of the installation of the sealing member Wh.

[0061] In the example shown in Figure 5, the sealing member Wh and the lid Lh are superimposed so that the lid side hole THh and the rigid body RG fit inside the sealing member side hole THw, and the sealing member Wh is attached to the lid Lh by joining it to the lid Lh using double-sided tape or adhesive.

[0062] Figure 6 shows an example of how to attach the retaining member Hh.

[0063] In the example shown in Figure 6, the retaining member Hh is attached to the lid Lh by passing it through the lid side hole THh, the rigid body side hole THr, and the sealing member side hole THw.

[0064] Figure 7 shows how the cover Lh shown in Figure 6 is attached to the outer panel P. Figure 7(a) is a cross-sectional view of AA shown in Figure 2 before the sealing member Wh shrinks, and Figure 7(b) is a cross-sectional view of AA shown in Figure 2 after the sealing member Wh shrinks. The retaining member Hh is, for example, a bolt, comprising a shaft SF and a head HD provided at one end of the shaft SF. Furthermore, a female thread corresponding to the male thread of the shaft SF is formed on the inner circumferential surface of the outer panel side hole THt, and the shaft SF is fastened to the outer panel P by inserting the shaft SF into the outer panel side hole THt. In other words, the retaining member Hh is a fastening member that generates axial force by being inserted into a screw hole provided in the outer panel P, and the rigid body RG is arranged around the fastening member. In other words, the rigid body RG is a member that generates axial force for the retaining member Hh. Alternatively, instead of providing the outer panel side hole THt in the outer panel P, a nut for fastening to the shaft SF may be provided in the outer panel P.

[0065] First, the tip of the shaft portion SF of the retaining member Hh shown in Figure 6 is aligned with the outer plate side hole THt provided in the outer plate P. Then, by rotating the retaining member Hh using a tool, the tip of the shaft portion SF is inserted into the outer plate side hole THt, as shown in Figure 7(a). Subsequently, by further rotating the retaining member Hh, the head HD pushes the lid portion Lh toward the outer plate P, and as the sealing member Wh and rigid body RG are compressed between the lid portion Lh and the outer plate P, the sealing member Wh and rigid body RG contract, as shown in Figure 7(b). In other words, the head HD and shaft portion SF push the lid portion Lh toward the outer plate P while maintaining the positional relationship between the lid portion Lh and the outer plate P, thereby contracting the sealing member Wh and rigid body RG.

[0066] Thus, according to the water intrusion suppression structure of the fuel cell module FCM of this embodiment, the sealing member Wh can be contracted, and the repulsive force from the sealing member Wh to the lid Lh and the outer plate P allows the sealing member Wh to be brought into close contact with the lid Lh and the outer plate P, thereby suppressing the intrusion of water from the outside of the fuel cell module FCM into the inside of the fuse box HB.

[0067] Furthermore, in the water-suppression structure of the fuel cell module FCM of this embodiment, the shaft portion SF passes through the lid side hole THh, the rigid body side hole THr, and the outer plate side hole THt, and the lid portion Lh, sealing member Wh, rigid body RG, and outer plate P are sandwiched between the head HD and the shaft portion SF, thereby causing the sealing member Wh and rigid body RG to contract.

[0068] Thus, according to the water ingress suppression structure of the fuel cell module FCM of this embodiment, the sealing member Wh and the rigid body RG can be contracted, and an axial force can be generated in the holding member Hh due to the repulsive force from the sealing member Wh to the lid Lh and outer plate P, and the repulsive force from the rigid body RG to the lid Lh and outer plate P. Therefore, even if creep occurs in the sealing member Wh and the rigid body RG due to aging deterioration and they contract further, if the amount of contraction of the rigid body RG per unit time due to aging deterioration is smaller than the amount of contraction of the sealing member Wh per unit time due to aging deterioration, it is possible to suppress a decrease in the axial force of the holding member Hh.

[0069] Furthermore, as shown in Figures 7(a) and 7(b), in side views of the retaining member Hh and the rigid body RG, the outer diameter of the head HD is larger than the inner diameter of the rigid body RG, and the outer diameter of the rigid body RG is larger than the outer diameter of the head HD.

[0070] This allows the rigid body RG to reliably generate the axial force of the holding member Hh.

[0071] It should be noted that the present invention is not limited to the embodiments described above, and various improvements and modifications are possible without departing from the spirit of the invention.

[0072] <Example 1> In the above embodiment, the retaining member Hh is constructed with a bolt as shown in Figure 8(a), but it may also be constructed with a screw as shown in Figure 8(b), with a bumper clip (push rivet) as shown in Figure 8(c), or with a member utilizing a leaf spring as shown in Figure 8(d). Note that the shaft portion SF and head portion HD shown in Figure 8 have the same function as the shaft portion SF and head portion HD shown in Figure 7 (the function of pushing the lid portion Lh downwards toward the outer panel P while maintaining the positional relationship between the lid portion Lh and the outer panel P).

[0073] <Modification 2> In the above embodiment, the rigid body RG is made up of washers, but the rigid body RG may also be made up of a plate-shaped member as shown in Figure 9. In the example shown in Figure 9, two rigid bodies RG are mounted parallel to each other around the periphery of each lid portion Lh.

[0074] In this way, even when a rigid body RG is constructed, the decrease in the axial force of the holding member Hh can be suppressed.

[0075] <Variation 3> In the above embodiment, as shown in Figure 3(b), the sealing member Wh is formed over the entire surface except for the sealing member side hole THw, in accordance with the shape of the lid portion Lh. However, the sealing member Wh may also be formed in an annular shape along the outer circumference of the lid portion Lh. [Explanation of Symbols]

[0076] FCM Fuel Cell Module P exterior Lh, Lp lid part Hh, Hp holding member Wh sealing member RG rigid body

Claims

1. A water-reducing structure for a fuel cell module, A first cover portion that covers a first opening provided on the outer casing of the fuel cell module, A sealing member having elasticity is provided between the outer plate and the first lid, A first retaining member that holds the first lid portion to the outer plate via the sealing member by axial force, A rigid body interposed between the outer plate and the first lid, A water-reducing structure for a fuel cell module equipped with the following features.

2. A water-reducing structure for a fuel cell module according to claim 1, The first retaining member is a fastening member that generates the axial force by being inserted into screw holes provided in the first lid and the outer plate, respectively. The rigid body is positioned around the fastening member. Water exposure suppression structure for fuel cell modules.

3. A water-reducing structure for a fuel cell module according to claim 1, The rigid body is a washer through which the first retaining member passes. The sealing member has a relief portion between the first lid and the outer plate for interposing the first retaining member and the washer. Water exposure suppression structure for fuel cell modules.

4. A water-reducing structure for a fuel cell module according to claim 1, The first opening is an opening in a fuse box where a fuse is located. Water exposure suppression structure for fuel cell modules.

5. A water-reducing structure for a fuel cell module according to claim 3, The first retaining member comprises a shaft portion and a head portion provided at one end of the shaft portion, wherein the shaft portion passes through at least a lid side hole provided in the first lid portion and an outer plate side hole provided in the outer plate, and generates the axial force by sandwiching the first lid portion, the sealing member, the rigid body, and the outer plate between the head portion and the shaft portion. In a side view of the first holding member and the rigid body, the outer diameter of the head is larger than the inner diameter of the rigid body, and the outer diameter of the rigid body is larger than the outer diameter of the head. Water exposure suppression structure for fuel cell modules.

6. A water-reducing structure for a fuel cell module according to claim 1, The sealing member is formed to cover the entire surface of the first lid, except for the hole through which the first retaining member passes. Water exposure suppression structure for fuel cell modules.

7. A water-reducing structure for a fuel cell module according to claim 4, A second cover portion that covers the second opening provided in the outer plate, A second retaining member that holds the first lid portion to the outer plate, Equipped with, The second opening is an opening in a box where a plug is placed to disconnect the electrical wiring to which the fuse is connected when the fuse is replaced. The first retaining member is a member that can be used to attach and detach the first lid using a tool. The second retaining member is a member that allows the second lid to be attached and detached without the use of tools. Water exposure suppression structure for fuel cell modules.

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