JP2023083959A - Fuel battery system - Google Patents

Fuel battery system Download PDF

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JP2023083959A
JP2023083959A JP2021197989A JP2021197989A JP2023083959A JP 2023083959 A JP2023083959 A JP 2023083959A JP 2021197989 A JP2021197989 A JP 2021197989A JP 2021197989 A JP2021197989 A JP 2021197989A JP 2023083959 A JP2023083959 A JP 2023083959A
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fuel cell
elastic member
cell system
cell stack
sliding portion
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博之 礒田
Hiroyuki Isoda
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

To provide a fuel battery system capable of surely holding a fuel battery in a housing and suppressing wearing of a mount caused by input from the outside.SOLUTION: A fuel battery system comprises: a power generation structure in which at least one fuel battery stack configured by stacking unit cells and an accessory structure including an accessory exchanging a gas with the fuel battery stack are connected and integrated; and a power generation structure case in which the power generation structure is housed. In the fuel battery system, the accessory structure is fastened to the power generation structure case, and the fuel battery stack is fastened to the power generation structure case via a mount of which the end in a stacking direction is fastened to the accessory structure and the opposite side of the accessory structure can be displaced in the stacking direction.SELECTED DRAWING: Figure 5

Description

本発明は、燃料電池システムに関する。 The present invention relates to fuel cell systems.

燃料電池システムは、防水性等を確保するために燃料電池スタックを筐体に収めた状態で使用されることが多い。特許文献１には、筐体内に収容した燃料電池が熱により膨張することで予期しない部位に膨張応力が掛かることを抑制するために、燃料電池の熱膨張／収縮の方向のみに変位可能な複数の一軸性マウントを介して燃料電池が筐体に支持される構成が開示されている。 A fuel cell system is often used with a fuel cell stack housed in a housing in order to ensure waterproofness and the like. In Patent Document 1, in order to suppress expansion stress from being applied to unexpected parts due to thermal expansion of a fuel cell accommodated in a housing, a plurality of devices capable of being displaced only in the direction of thermal expansion/contraction of the fuel cell are disclosed. A configuration is disclosed in which a fuel cell is supported by a housing via a uniaxial mount.

特開２０２０－０４３０２０号公報Japanese Patent Application Laid-Open No. 2020-043020

上記文献の構成では、全ての支持部に一軸性マウントが用いられている。換言すると、全ての支持部において、一軸性マウントが変位可能な方向については固定されていない。このため、燃料電池システムに外部からの入力があった場合に、変位可能な方向に微振動が生じて、一軸性マウントにフレッティング摩耗が生じる可能性がある。例えば、車両等の移動体に搭載した燃料電池システムは、移動体の加減速や上下振動による入力を受ける。また、定置用の燃料電池システムであっても地震による入力があり、ポータブルタイプの燃料電池システムであっても搬送中に外部からの入力がある。 In the configuration of the above document, uniaxial mounts are used for all supports. In other words, the direction in which the uniaxial mount can be displaced is not fixed at any of the supports. Therefore, when there is an external input to the fuel cell system, there is a possibility that microvibrations will occur in the displaceable direction and fretting wear will occur in the uniaxial mount. For example, a fuel cell system mounted on a mobile object such as a vehicle receives input from acceleration/deceleration and vertical vibration of the mobile object. In addition, even a stationary fuel cell system receives input from an earthquake, and even a portable fuel cell system receives input from the outside during transportation.

そこで本発明では、燃料電池を筐体内に確実に保持し、かつ上述したような外部からの入力によるマウントの摩耗を抑制し得る燃料電池システムを提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fuel cell system capable of reliably holding a fuel cell in a housing and suppressing wear of the mount due to the above-described external input.

本発明のある態様によれば、単セルが積層されてなる少なくとも一個の燃料電池スタックと、燃料電池スタックとの間でガスの授受を行う補機を含む補機構造体とが接続されて一体化した発電構造体と、発電構造体を収容する発電構造体ケースと、を備える燃料電池システムが提供される。このシステムにおいて、補機構造体は発電構造体ケースに締結され、燃料電池スタックは、積層方向の一方の端部が補機構造体に締結され補機構造体とは反対側が積層方向に変位可能なマウントを介して発電構造体ケースに締結されている。 According to one aspect of the present invention, at least one fuel cell stack formed by stacking unit cells and an accessory structure including accessories for exchanging gas between the fuel cell stack and the fuel cell stack are connected and integrated. A fuel cell system is provided that includes an integrated power generating structure and a power generating structure case that houses the power generating structure. In this system, the accessory structure is fastened to the power generation structure case, and the fuel cell stack has one end in the stacking direction fastened to the accessory structure, and the side opposite to the accessory structure is displaceable in the stacking direction. It is fastened to the power generation structure case via a mount.

上記態様によれば、燃料電池を筐体内に確実に保持し、かつ外部からの入力によるマウントの摩耗を抑制し得る燃料電池システムを提供することができる。 According to the above aspect, it is possible to provide a fuel cell system that can reliably hold the fuel cell in the housing and suppress wear of the mount due to input from the outside.

図１は、車載用燃料電池システムの分解斜視図である。FIG. 1 is an exploded perspective view of an in-vehicle fuel cell system. 図２は、前方部材を車体前後方向の斜め後ろから見た図である。FIG. 2 is a diagram of the front member viewed obliquely from behind in the front-rear direction of the vehicle body. 図３は、図２の領域IIIを前方部材の内側から見た図である。3 is a view of region III of FIG. 2 viewed from the inside of the front member; FIG. 図４は、発電構造体を発電構造体ケースに収容する工程における、補強部に対する第２マウントの動きを示す図である。FIG. 4 is a diagram showing movement of the second mount with respect to the reinforcing portion in the step of housing the power generating structure in the power generating structure case. 図５は、発電構造体が前方部材に支持された状態を車体後方から見た図である。FIG. 5 is a view of the power generating structure supported by the front member, viewed from the rear of the vehicle body. 図６は、図１から第１燃料電池スタック及び第１マウントを抽出した図である。FIG. 6 is a diagram of the first fuel cell stack and the first mount extracted from FIG. 図７は、第１マウントの分解斜視図である。FIG. 7 is an exploded perspective view of the first mount. 図８は、第１マウントの断面図である。FIG. 8 is a cross-sectional view of the first mount. 図９は、第１マウントと燃料電池スタック及び前方部材との接続部付近を示す図である。FIG. 9 is a diagram showing the vicinity of the connecting portion between the first mount, the fuel cell stack, and the front member. 図１０は、第１弾性部材を説明するための図である。FIG. 10 is a diagram for explaining the first elastic member. 図１１は、第２弾性部材を説明するための図である。FIG. 11 is a diagram for explaining the second elastic member.

以下、添付図面を参照しながら本発明の実施形態について説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.

[第１実施形態]
図１は、本実施形態にかかる車載用燃料電池システム（以下、「燃料電池システム」ともいう）１の分解斜視図である。図２は、後述する前方部材５を車体前後方向の斜め後ろから見た図である。 [First Embodiment]
FIG. 1 is an exploded perspective view of an in-vehicle fuel cell system (hereinafter also referred to as "fuel cell system") 1 according to this embodiment. FIG. 2 is a view of the front member 5, which will be described later, viewed obliquely from behind in the front-rear direction of the vehicle body.

本実施形態では、駆動モータにより走行する電動車両に搭載される燃料電池システム１を例に挙げて説明する。また、本実施形態では、固体酸化物形の燃料電池を想定している。 In this embodiment, a fuel cell system 1 installed in an electric vehicle that runs by a drive motor will be described as an example. Further, in this embodiment, a solid oxide fuel cell is assumed.

燃料電池システム１は、発電構造体Ａと、発電構造体Ａを収容する発電構造体ケースＢとを備える。 The fuel cell system 1 includes a power generation structure A and a power generation structure case B that houses the power generation structure A. As shown in FIG.

発電構造体Ａを発電構造体ケースＢに収容する理由は主に次の３つである。 There are mainly three reasons for housing the power generating structure A in the power generating structure case B as follows.

第１に、衝突や他部品との干渉等による発電構造体Ａの破損を防止しつつ、車体に確実に固定するためである。第２に、使用する燃料は主に可燃性かつ無臭であるため、燃料電池スタックや補機構造体からの漏れを可燃限界以下のレベルに抑制する必要があるからである。なお、漏れを検知し易いように燃料に付臭剤を混入させるが、付臭剤による触媒の被毒劣化を抑制するため、付臭剤は改質器に投入される前に除去される。第３に、固体酸化物形燃料電池は、発電温度が高く（５００℃以上）、システム運転中はこの温度を維持する必要がある。一方、原動機室に収容される他の補機や車載部品はこのような高温への耐性がない。そこで、放熱による温度低下を抑制するための断熱と、他の補機等の保護のための遮熱が必要となる。 Firstly, it is intended to prevent the power generating structure A from being damaged due to collision, interference with other parts, etc., and to securely fix the power generating structure A to the vehicle body. Secondly, since the fuel used is mainly combustible and odorless, it is necessary to suppress leakage from the fuel cell stack and the accessory structure to a level below the flammability limit. An odorant is mixed in the fuel so that leakage can be easily detected, but the odorant is removed before it is introduced into the reformer in order to suppress poisoning and deterioration of the catalyst due to the odorant. Third, the solid oxide fuel cell has a high power generation temperature (500° C. or higher), and this temperature must be maintained during system operation. On the other hand, other accessories and on-vehicle components housed in the motor compartment are not resistant to such high temperatures. Therefore, heat insulation for suppressing temperature drop due to heat dissipation and heat shielding for protection of other auxiliary equipment and the like are required.

発電構造体Ａは、第１燃料電池スタック２Ａと第２燃料電池スタック２Ｂの間に補機構造体３が配置され、下から第２燃料電池スタック２Ｂ、補機構造体３、第１燃料電池スタック２Ａの順に積層された積層構造となっている。補機構造体３は、第１燃料電池スタック２Ａ、第２燃料電池スタック２Ｂとガスの授受を行う補機（熱交換器、燃焼器等）を包含する筐体である。なお、以下の説明において、特に区別する必要がない場合には、第１燃料電池スタック２Ａと第２燃料電池スタック２Ｂをまとめて燃料電池スタック２と称する。燃料電池スタック２は、単セルが車体上下方向に積層されたものである。 In the power generation structure A, the auxiliary equipment structure 3 is arranged between the first fuel cell stack 2A and the second fuel cell stack 2B, and from the bottom, the second fuel cell stack 2B, the auxiliary equipment structure 3, the first fuel cell It has a laminated structure in which the stack 2A is laminated in order. The accessory structure 3 is a housing that includes accessories (heat exchanger, combustor, etc.) that exchange gas with the first fuel cell stack 2A and the second fuel cell stack 2B. In the following description, the first fuel cell stack 2A and the second fuel cell stack 2B will be collectively referred to as the fuel cell stack 2 unless they need to be distinguished from each other. The fuel cell stack 2 is formed by stacking single cells in the vertical direction of the vehicle body.

補機構造体３の車体左右方向の左側側面には、後述する第２マウント９Ａを介して空気供給管（不図示）、バイパス空気供給管（不図示）及び起動時用空気供給管（不図示）が接続される流路の開口部が形成されている。また、補機構造体３の車体左右方向の左側側面には、燃料供給管（不図示）と燃焼用燃料供給管（不図示）がそれぞれ接続される流路の開口部が形成されている。空気供給管は、補機としての熱交換器に外部から空気を供給するための配管である。空気供給管から供給された空気は、熱交換器により加熱されてから燃料電池スタック２に供給される。バイパス空気供給管は、補機としての熱交換器を通さずに燃料電池スタックに供給する空気を供給するための配管である。起動時用空気供給管は、燃料電池システムの起動時にアノード極に供給する空気を供給するための配管である。燃料供給管は燃料電池スタック２に燃料ガスを供給するための配管である。燃焼用燃料供給管は、燃料電池システム１の起動時に、燃料ガスを補機としての燃焼器に供給するための配管である。 An air supply pipe (not shown), a bypass air supply pipe (not shown), and a start-up air supply pipe (not shown) are mounted on the left side surface of the accessory structure 3 in the left-right direction of the vehicle body via a second mount 9A, which will be described later. ) is formed in the opening of the channel to which the . Further, on the left side surface of the accessory structure 3 in the left-right direction of the vehicle body, there is formed an opening of a flow path to which a fuel supply pipe (not shown) and a fuel supply pipe for combustion (not shown) are connected. The air supply pipe is a pipe for supplying air from the outside to the heat exchanger as an accessory. The air supplied from the air supply pipe is heated by the heat exchanger and then supplied to the fuel cell stack 2 . The bypass air supply pipe is a pipe for supplying air to the fuel cell stack without passing through the heat exchanger as an accessory. The start-up air supply pipe is a pipe for supplying air to the anode during start-up of the fuel cell system. The fuel supply pipe is a pipe for supplying fuel gas to the fuel cell stack 2 . The fuel supply pipe for combustion is a pipe for supplying fuel gas to a combustor as an auxiliary device when the fuel cell system 1 is started.

また、補機構造体３の車体前後方向の後側側面には、排気管１３が接続される排気通路の開口部３Ａが設けられている。 Further, an opening 3A of an exhaust passage to which an exhaust pipe 13 is connected is provided on the rear side surface of the auxiliary machinery structure 3 in the longitudinal direction of the vehicle body.

発電構造体ケースＢは、車体前後方向前側に配置される前方部材５と、車体前後方向後側に配置される後方部材６とで構成される、分割構造となっている。前方部材５は、例えば金属鋳造により成形され、後方部材６は、例えば鋼板をプレス加工することにより成形される。 The power generation structure case B has a split structure including a front member 5 arranged on the front side in the vehicle longitudinal direction and a rear member 6 arranged on the rear side in the vehicle longitudinal direction. The front member 5 is formed by metal casting, for example, and the rear member 6 is formed by pressing a steel plate, for example.

前方部材５は、車載状態で車体前後方向の先端部となる前面５Ａと、前面５Ａの車体左右方向の両側から車体後方に延びる２つの側面５Ｂと、前面５Ａの車体上下方向の両側から車体後方に延びる上面５Ｃ及び下面５Ｄと、からなる箱形状を有する。そして、発電構造体Ａは、第１燃料電池スタック２Ａに設けた第１マウント１０Ａ、１０Ｂと、補機構造体３に設けた第２マウント９Ａ、９Ｂと、第２燃料電池スタック２Ｂに設けた第３マウント１１Ａ、１１Ｂと、を介してボルト（不図示）により前方部材５の側面５Ｂにのみ固定されている。第１マウント１０Ａ、１０Ｂ及び第３マウント１１Ａ、１１Ｂの構造については後述する。なお、車体左右方向右側の第３マウント１１Ｂは図示していない。 The front member 5 has a front surface 5A which is a leading end portion in the longitudinal direction of the vehicle body when mounted on the vehicle, two side surfaces 5B extending rearward of the vehicle body from both sides of the front surface 5A in the left and right direction of the vehicle body, and two side surfaces 5B extending rearward of the vehicle body from both sides of the front surface 5A in the vertical direction of the vehicle body. It has a box shape consisting of an upper surface 5C and a lower surface 5D extending inward. The power generation structure A includes first mounts 10A and 10B provided on the first fuel cell stack 2A, second mounts 9A and 9B provided on the auxiliary equipment structure 3, and the second fuel cell stack 2B. It is fixed only to the side surface 5B of the front member 5 by bolts (not shown) via the third mounts 11A and 11B. The structures of the first mounts 10A, 10B and the third mounts 11A, 11B will be described later. Note that the third mount 11B on the right side in the left-right direction of the vehicle body is not shown.

車体左右方向左側の第２マウント９Ａは、発電構造体Ａに作動流体を供給する作動流体導入部材（より具体的には空気マニホールド）を兼ねる。そして、第２マウント９Ａには、上述した補機構造体３の各開口部と、空気供給管（不図示）、燃料供給管（不図示）、燃焼用燃料供給管（不図示）及びバイパス空気供給管（不図示）をそれぞれ連通する通路が設けられている。 The second mount 9A on the left side in the left-right direction of the vehicle also serves as a working fluid introduction member (more specifically, an air manifold) that supplies working fluid to the power generation structure A. As shown in FIG. In the second mount 9A, each opening of the accessory structure 3, an air supply pipe (not shown), a fuel supply pipe (not shown), a combustion fuel supply pipe (not shown) and bypass air Passages are provided that respectively communicate with supply pipes (not shown).

側面５Ｂは、第２マウント９Ａ、９Ｂが取り付けられる部分を車体前後方向前側、車体上下方向上側及び車体上下方向下側から囲む補強部１４を有する。この補強部１４は、側面５Ｂの他の部位から前方部材５の内側に向けて突出している。なお、補強部１４は前方部材５と一体として形成してもよいし、別部材として成形したものを前方部材５に取り付けてもよい。 The side surface 5B has a reinforcing portion 14 surrounding the portion to which the second mounts 9A and 9B are attached from the front side in the vehicle longitudinal direction, the upper side in the vertical direction of the vehicle body, and the lower side in the vertical direction of the vehicle body. This reinforcing portion 14 protrudes toward the inside of the front member 5 from other portions of the side surface 5B. The reinforcing portion 14 may be formed integrally with the front member 5 or may be molded as a separate member and attached to the front member 5 .

後方部材６は、発電構造体Ａと発電構造体ケースＢの外部にある電装ユニット７とを接続する配線４が通る開口部８及び開口部８を囲むシール部８Ａを有するシール面６Ａを有する。なお、電装ユニット７には、コントローラ、コンバータ等が含まれる。そして、シール面６Ａには他の面に比べて面剛性を高める補強が施されている。補強方法としては、シール面６Ａの板厚を他の部位に比べて厚くする、または開口部８を囲む額縁上の補強材を取り付ける等、種々の方法を採り得る。 The rear member 6 has an opening 8 through which the wiring 4 connecting the power generation structure A and the electrical unit 7 outside the power generation structure case B passes, and a sealing surface 6A having a seal portion 8A surrounding the opening 8. As shown in FIG. Note that the electrical unit 7 includes a controller, a converter, and the like. The sealing surface 6A is reinforced to increase the surface rigidity compared to other surfaces. As a reinforcing method, various methods such as making the plate thickness of the sealing surface 6A thicker than other portions, attaching a frame-like reinforcing material surrounding the opening 8, and the like can be adopted.

開口部８は、車体前後方向後方に向けて開口しており、かつ、電装ユニット７がシール部８Ａに取り付けられることで塞がれる。また、後方部材６は、電装ユニット７が取り付けられる部分の下方に、車体前後方向後方に向けて延びる庇形状の突出部７Ｂを備える。 The opening 8 is open rearward in the longitudinal direction of the vehicle body, and is closed by attaching the electrical unit 7 to the seal portion 8A. Further, the rear member 6 has an eave-shaped projecting portion 7B extending rearward in the longitudinal direction of the vehicle body below the portion where the electrical unit 7 is attached.

前方部材５と後方部材６は、前方部材５の合わせ面（前方合わせ面）５Ｅと、後方部材６の合わせ面（後方合わせ面）６Ｃとが接続されることにより一体化する。そして、前方合わせ面５Ｅと後方合わせ面６Ｃはいずれも平面である。つまり、前方部材５と後方部材６の接続部は平面になっている。そして、この平面は、車体左右方向に沿っており、かつ上端が下端に比べて車体前後方向後側に位置する(つまり、車体上下方向を基準として後傾している)。 The front member 5 and the rear member 6 are integrated by connecting the mating surface (front mating surface) 5E of the front member 5 and the mating surface (rear mating surface) 6C of the rear member 6 . Both the front mating surface 5E and the rear mating surface 6C are flat surfaces. That is, the connecting portion between the front member 5 and the rear member 6 is flat. This plane extends along the left-right direction of the vehicle body, and the upper end is positioned rearward in the front-rear direction of the vehicle body relative to the lower end (that is, it is tilted rearward with respect to the vertical direction of the vehicle body).

前方部材５と後方部材６とを比較すると、発電構造体Ａを収容する容積は前方部材５の方が後方部材６より大きく、発電構造体Ａの大部分は前方部材５に収容されている。 Comparing the front member 5 and the rear member 6 , the front member 5 has a larger volume for accommodating the power generation structure A than the rear member 6 , and most of the power generation structure A is accommodated in the front member 5 .

次に、補強部１４について図３、図４を参照して説明する。 Next, the reinforcing portion 14 will be described with reference to FIGS. 3 and 4. FIG.

図３は、図２の領域IIIを前方部材５の内側から見た図である。図４は、発電構造体Ａを発電構造体ケースＢに収容する工程における、補強部１４に対する第２マウント９Ａの動きを示す図である。 FIG. 3 is a view of the region III in FIG. 2 viewed from the inside of the front member 5. FIG. 4A and 4B are diagrams showing the movement of the second mount 9A with respect to the reinforcing portion 14 in the step of housing the power generating structure A in the power generating structure case B. FIG.

補強部１４は、所定間隔をあけて同じ方向に延びる二本のガイド部１４Ａと、ガイド部１４Ａの車体前方側の端部同士を繋ぐストッパ部１４Ｂとを備える。ここでの所定間隔は、第２マウント９Ａの、側面５Ｂの内面と対向する部分の車体上下方向寸法と同じか、それよりもわずかに大きい。 The reinforcing portion 14 includes two guide portions 14A extending in the same direction at a predetermined interval, and a stopper portion 14B connecting the ends of the guide portions 14A on the front side of the vehicle body. The predetermined interval here is the same as or slightly larger than the vehicle vertical dimension of the portion of the second mount 9A that faces the inner surface of the side surface 5B.

ボルト孔１５は、発電構造体ケースＢに第２マウント９Ａを固定するためのボルトが貫通する孔である。 The bolt hole 15 is a hole through which a bolt for fixing the second mount 9A to the power generation structure case B penetrates.

なお、車体左右方向右側の補強部１４も上記と同様の構造である。ただし、二本のガイド部１４Ａの所定間隔は、車体左右方向右側の第２マウント９Ｂの側面５Ｂの内面と対向する部分の車体上下方向寸法と同じか、それよりもわずかに大きい。 The reinforcing portion 14 on the right side in the left-right direction of the vehicle body also has the same structure as above. However, the predetermined interval between the two guide portions 14A is the same as or slightly larger than the vehicle vertical dimension of the portion facing the inner surface of the side surface 5B of the second mount 9B on the right lateral side of the vehicle body.

補強部１４は、発電構造体Ａを発電構造体ケースＢに収容する工程において、ガイド及び位置決め用ストッパとしての機能を果たす。当該工程では、まず、発電構造体Ａの車体上下方向の位置を調整して、図４の（Ａ）に示すように、二本のガイド部１４Ａとストッパ部１４Ｂとからなるコの字状のガイドレールで囲まれることで形成された溝状凹部１９に発電構造体Ａから車体左右方向に突出した凸部である第２マウント９Ａを嵌合させる。このとき、車体左右方向右側の第２マウント９Ｂについても同様である。なお、ボルト１６は、第２マウント９Ａを補機構造体３に固定するためのものである。 In the step of housing the power generating structure A in the power generating structure case B, the reinforcing portion 14 functions as a guide and a positioning stopper. In this process, first, the position of the power generation structure A in the vertical direction of the vehicle body is adjusted, and as shown in FIG. The second mount 9A, which is a convex portion protruding from the power generation structure A in the left-right direction of the vehicle body, is fitted into the groove-shaped concave portion 19 formed by being surrounded by the guide rails. At this time, the same applies to the second mount 9B on the right side in the left-right direction of the vehicle body. The bolt 16 is for fixing the second mount 9A to the accessory structure 3. As shown in FIG.

そして、図４の（Ｂ）に示すように、第２マウント９Ａの車体前方側の端部がストッパ部１４Ｂに当接するまで（図４（Ｂ）の領域Ｃを参照のこと）、発電構造体Ａを車体前方（図４（Ａ）の矢印の方向）にスライドさせる。ストッパ部１４Ｂの寸法、第２マウント９Ａの形状及びボルト孔１７の位置等は、第２マウント９Ａがストッパ部１４Ｂに当接した状態で側面５Ｂのボルト孔１５と第２マウント９Ａのボルト孔１７の位置が合うように設定しておく。これにより、第２マウント９Ａがストッパ部１４Ｂに当接した状態で発電構造体ケースＢの外側から側面５Ｂのボルト孔１５にボルト１８を挿通させることで、発電構造体ケースＢと第２マウント９Ａをボルトにより剛結することができる。 Then, as shown in FIG. 4B, until the end of the second mount 9A on the front side of the vehicle body comes into contact with the stopper portion 14B (see region C in FIG. 4B), the power generation structure is Slide A toward the front of the vehicle body (in the direction of the arrow in FIG. 4(A)). The dimensions of the stopper portion 14B, the shape of the second mount 9A, the position of the bolt hole 17, and the like are such that when the second mount 9A is in contact with the stopper portion 14B, the bolt hole 15 of the side surface 5B and the bolt hole 17 of the second mount 9A are aligned. set so that the positions of As a result, while the second mount 9A is in contact with the stopper portion 14B, the bolt 18 is inserted through the bolt hole 15 of the side surface 5B from the outside of the power generating structure case B, thereby connecting the power generating structure case B and the second mount 9A. can be rigidly connected by bolts.

第２マウント９Ｂについても基本的には第２マウント９Ａと同様であるが、第２マウント９Ｂについては、例えばスペーサ等を介することによって、剛結ではなく車体左右方向の変位を許容し得る締結構造にしてもよい。 The second mount 9B is basically the same as the second mount 9A, but the second mount 9B has a fastening structure that allows displacement in the left-right direction of the vehicle body instead of being rigidly attached, for example, by interposing spacers or the like. can be

次に、第１マウント１０Ａ、１０Ｂ及び第３マウント１１Ａ、１１Ｂについて説明する。図５は、発電構造体Ａが前方部材５に支持された状態を車体後方から見た図である。 Next, the first mounts 10A, 10B and the third mounts 11A, 11B will be described. FIG. 5 is a view of the power generating structure A supported by the front member 5 as seen from the rear of the vehicle body.

上述した通り、発電構造体Ａは、第１マウント１０Ａ、１０Ｂと、第２マウント９Ａ、９Ｂと、第３マウント１１Ａ、１１Ｂを介して発電構造体ケースＢの前方部材５に支持されている。これらの支持部のうち、車体左方の第２マウント９Ａは剛結され、車体右方の第２マウント９Ｂは車体左右方向にのみ変位可能な自由度をもって締結されている。これらに対して第１マウント１０Ａ、１０Ｂ及び第３マウント１１Ａ、１１Ｂは、単セルの積層方向、つまり車体上下方向に変位可能な構造を有する。その理由は以下の通りである。 As described above, the power generating structure A is supported by the front member 5 of the power generating structure case B via the first mounts 10A, 10B, the second mounts 9A, 9B, and the third mounts 11A, 11B. Of these support portions, the second mount 9A on the left side of the vehicle body is rigidly connected, and the second mount 9B on the right side of the vehicle body is fastened with a degree of freedom that allows displacement only in the lateral direction of the vehicle body. On the other hand, the first mounts 10A, 10B and the third mounts 11A, 11B have a structure that can be displaced in the stacking direction of the single cells, that is, in the vertical direction of the vehicle body. The reason is as follows.

発電構造体Ａを発電構造体ケースＢに収容する場合、外部からの入力に耐えるために確実に支持する必要がある。その一方、燃料電池スタック２は、停止時にはほぼ外気温度と同じ温度であるが、運転時には５００℃以上にまで温度上昇する。このように燃料電池スタック２は停止時と運転時で温度が大きく、かつ構成部品点数が多いので、運転時と停止時でスタック長（車体上下方向寸法）が大きく変化する。このため、スタック長の変化を吸収する必要がある。そこで、第２マウント９Ａ、９Ｂで補機構造体３を発電構造体ケースＢに確実に固定し、第１マウント１０Ａ、１０Ｂ及び第３マウント１１Ａ、１１Ｂで燃料電池スタック２のスタック長の変化を吸収する。もちろん、第１マウント１０Ａ、１０Ｂ及び第３マウント１１Ａ、１１Ｂも車体前後方向及び車体左右方向については発電構造体Ａを確実に固定する機能を果たす。 When housing the power generating structure A in the power generating structure case B, it is necessary to reliably support the power generating structure A in order to withstand external input. On the other hand, the temperature of the fuel cell stack 2 is approximately the same as the outside air temperature when the vehicle is stopped, but the temperature rises to 500° C. or more during operation. As described above, the temperature of the fuel cell stack 2 is high when it is stopped and when it is in operation, and the number of constituent parts is large. Therefore, it is necessary to absorb the change in stack length. Therefore, the auxiliary machinery structure 3 is securely fixed to the power generating structure case B with the second mounts 9A and 9B, and the change in the stack length of the fuel cell stack 2 is controlled with the first mounts 10A and 10B and the third mounts 11A and 11B. Absorb. Of course, the first mounts 10A, 10B and the third mounts 11A, 11B also function to reliably fix the power generating structure A in the vehicle longitudinal direction and the vehicle lateral direction.

次に、第１マウント１０Ａ、１０Ｂ及び第３マウント１１Ａ、１１Ｂの構造について説明する。これらは燃料電池スタック２への取り付け方に違いはあるものの、車体上下方向の変位を可能にする構造は同じなので、本実施形態では、第１マウント１０Ｂを例に挙げて説明する。 Next, the structures of the first mounts 10A, 10B and the third mounts 11A, 11B will be described. Although there are differences in how they are attached to the fuel cell stack 2, they have the same structure that enables vertical displacement of the vehicle body.

図６は、図１から第１燃料電池スタック２Ａ及び第１マウント１０Ａ、１０Ｂを抽出した図である。 FIG. 6 is a diagram of the first fuel cell stack 2A and the first mounts 10A and 10B extracted from FIG.

第１マウント１０Ａ、１０Ｂは、それぞれ異なる形状のステー２０を介して第１燃料電池スタック２Ａに固定されている。ステー２０は第１燃料電池スタック２Ａの上側エンドプレート２１にボルトで固定されている。なお、ステー２０が上側エンドプレート２１と一体に形成されていても構わない。 The first mounts 10A and 10B are fixed to the first fuel cell stack 2A via stays 20 having different shapes. The stay 20 is bolted to the upper end plate 21 of the first fuel cell stack 2A. Note that the stay 20 may be formed integrally with the upper end plate 21 .

図７は、第１マウント１０Ａの分解斜視図である。第１マウント１０は、車体上下方向に延びる筒状のガイド部２２Ａを有し発電構造体ケースＢに固定される筒部２２と、ガイド部２２Ａの内側に摺動可能に配置される摺動部２３Ａ及び燃料電池スタック２に固定される固定部２３Ｂを有する摺動子２３を備える。ガイド部２２Ａの車体上下方向の端部は上蓋２４Ａと下蓋２４Ｂにより閉塞される。以下の説明において、注意書きがない場合には、筒部２２といったら上蓋２４Ａ及び下蓋２４Ｂも含むこととする。 FIG. 7 is an exploded perspective view of the first mount 10A. The first mount 10 includes a tubular portion 22 having a tubular guide portion 22A extending in the vertical direction of the vehicle body and fixed to the power generating structure case B, and a sliding portion slidably arranged inside the guide portion 22A. 23A and a wiper 23 having a fixed portion 23B fixed to the fuel cell stack 2 is provided. The ends of the guide portion 22A in the vertical direction of the vehicle body are closed by an upper lid 24A and a lower lid 24B. In the following description, unless otherwise noted, the cylindrical portion 22 includes the upper lid 24A and the lower lid 24B.

また、第１マウント１０は、ガイド部２２Ａと摺動部２３Ａとの隙間に配置されて摺動部２３Ａの車体上下方向と直交する方向への変位を吸収する第３弾性部材２６を備える。車体上下方向と直交する方向への変位とは、例えば、車両の加減速に伴う車体前後方向の入力による変位及び車両の旋回に伴う車体左右方向の入力による変位である。第３弾性部材２６を配置することで、車体上下方向以外の方向の変位があっても第３弾性部材２６のストロークの範囲内であれば変位を吸収できる。 The first mount 10 also includes a third elastic member 26 arranged in a gap between the guide portion 22A and the sliding portion 23A to absorb displacement of the sliding portion 23A in a direction perpendicular to the vertical direction of the vehicle body. The displacement in the direction orthogonal to the vertical direction of the vehicle body is, for example, displacement due to input in the longitudinal direction of the vehicle accompanying acceleration/deceleration of the vehicle and displacement due to input in the lateral direction of the vehicle accompanying turning of the vehicle. By arranging the third elastic member 26, even if there is displacement in a direction other than the vertical direction of the vehicle body, the displacement can be absorbed within the range of the stroke of the third elastic member 26.

さらに第１マウント１０は、上蓋２４Ａ及び下蓋２４Ｂと摺動部２３Ａとの隙間に配置されて摺動部２３Ａの車体上下方向の変位を吸収する第４弾性部材２５Ａ、２５Ｂを備える。車体上下方向の変位とは、上述した燃料電池スタック２の膨張／収縮による変位の他に、車両走行中の路面の凹凸に起因する上下振動による変位も含む。なお、上側の第４弾性部材２５Ａと下側の第４弾性部材２５Ｂを区別する必要がない場合には、両者をまとめて第４弾性部材２５という。 Further, the first mount 10 includes fourth elastic members 25A and 25B arranged in the gaps between the upper and lower lids 24A and 24B and the sliding portion 23A to absorb displacement of the sliding portion 23A in the vertical direction of the vehicle body. The displacement in the vertical direction of the vehicle body includes not only the displacement due to the expansion/contraction of the fuel cell stack 2 described above, but also the displacement due to vertical vibration caused by unevenness of the road surface while the vehicle is running. When there is no need to distinguish between the upper fourth elastic member 25A and the lower fourth elastic member 25B, both are collectively referred to as the fourth elastic member 25. FIG.

これら第３弾性部材２６及び第４弾性部材２５を備えることで、摺動子２３を筒部２２内の所定の位置に保持可能して、筒部２２内での摺動子２３のガタツキを抑制できる。 By providing the third elastic member 26 and the fourth elastic member 25, the slider 23 can be held at a predetermined position within the cylindrical portion 22, and rattling of the slider 23 within the cylindrical portion 22 is suppressed. can.

第３弾性部材２６及び第４弾性部材２５は、それぞれバネ定数の異なる２種類の弾性体からなる。本実施形態では、弾性体として、板バネ（板状のバネ材）を波形に曲げた波形バネを用いる。 The third elastic member 26 and the fourth elastic member 25 are each composed of two types of elastic bodies having different spring constants. In this embodiment, a wavy spring obtained by bending a leaf spring (plate-like spring material) into a wavy shape is used as the elastic body.

第３弾性部材２６は、摺動部２３Ａと筒部２２（上蓋２４Ａと下蓋２４Ｂを含まず）との隙間を埋めるように波形バネをガイド部２２Ａの形状に沿って曲げ加工したものであり、上端の波形バネ２６Ａと下端の波形バネ２６Ｃが同じバネ定数である。すなわち、第３弾性部材２６は、２種類の波形バネのうち一方（ここでは波形バネ２６Ａ、２６Ｃ）が車体上下方向に２分割され、２分割された波形バネ２６Ａ、２６Ｃが２種類の波形バネのうち他方（ここでは波形バネ２６Ｂ）を車体上下方向の両側から挟む構成となっている。 The third elastic member 26 is formed by bending a wave spring along the shape of the guide portion 22A so as to fill the gap between the sliding portion 23A and the cylindrical portion 22 (not including the upper lid 24A and the lower lid 24B). , the wave spring 26A at the upper end and the wave spring 26C at the lower end have the same spring constant. That is, one of the two types of wave springs (here, wave springs 26A and 26C) of the third elastic member 26 is divided into two in the vertical direction of the vehicle body, and the two divided wave springs 26A and 26C are divided into two types of wave springs. Of these, the other (wave spring 26B in this case) is sandwiched from both sides in the vertical direction of the vehicle body.

なお、波形バネ２６Ａ、２６Ｃのバネ定数と波形バネ２６Ｂのバネ定数は、どちらが大きくても構わない。上側の第４弾性部材２５Ａとしての波形バネのバネ定数と下側の第４弾性部材２５Ｂとしての波形バネのバネ定数についても同様である。 It does not matter which of the spring constants of the wave springs 26A and 26C and the spring constant of the wave spring 26B is larger. The same applies to the spring constant of the wave spring as the upper fourth elastic member 25A and the spring constant of the wave spring as the lower fourth elastic member 25B.

各波形バネ２６Ａ－２６Ｃの車体上下方向の寸法は任意であるが、本実施形態では、２分割されていない方の波形バネ２６Ｂの車体上下方向の寸法が、２分割された波形バネ２６Ａ、２６Ｃのそれぞれの車体上下方向の寸法を足したもの以上とする。 The vertical dimension of each of the wave springs 26A to 26C in the vehicle body vertical direction is arbitrary, but in this embodiment, the vertical dimension of the wave spring 26B, which is not divided into two, is the same as that of the wave springs 26A and 26C divided into two. It shall be at least the sum of the dimensions in the vertical direction of the vehicle body.

なお、第３弾性部材２６は、本実施形態のように１つの波形バネを、摺動部２３Ａを囲む形状に曲げ加工したものに限られるわけではない。例えば、車体左右方向及び車体前後方向の各隙間に独立した波形バネを配置してもよい。 In addition, the third elastic member 26 is not limited to one formed by bending a single wave spring into a shape surrounding the sliding portion 23A as in the present embodiment. For example, independent wave springs may be arranged in the respective gaps in the lateral direction of the vehicle body and in the longitudinal direction of the vehicle body.

上記のように弾性体として波形バネを用いることで、つるまきバネ等を用いる場合に比べて、筒部２２と摺動部２３Ａとの隙間を小さくでき、これにより第１マウント１０Ｂをコンパクトな構成にすることができる。さらに、波形バネにすることで、摺動部２３Ａと筒部２２のそれぞれに接触させることができ、これにより筒部２２内で摺動部２３Ａの姿勢を保持し易くなる。 By using the wave spring as the elastic body as described above, the gap between the cylindrical portion 22 and the sliding portion 23A can be made smaller than when a helical spring or the like is used, thereby making the first mount 10B compact. can be Furthermore, by using a wave spring, it is possible to bring the sliding portion 23A and the cylindrical portion 22 into contact with each other, thereby making it easier to maintain the posture of the sliding portion 23A within the cylindrical portion 22 .

また、バネ定数の異なる２種類の波形バネにすることで、仮に一方の波形バネが共振しても、他方の波形バネで摺動子２３を保持できる。さらに、仮に一方の波形バネが何らかの理由により弾性力を失ったとしても、他方の波形バネで摺動子２３を保持できる。特に本実施形態では、第３弾性部材２６を、車体上下方向の寸法が相対的に大きい波形バネ２６Ｂを中央に、相対的に小さい波形バネ２６Ａ、２６Ｃをその両端に配置する構成にすることで、一方の波形バネに共振等が生じた場合の摺動子２３の保持性能をより高めることができる。 Further, by using two types of wave springs having different spring constants, even if one wave spring resonates, the other wave spring can hold the slider 23 . Furthermore, even if one wave spring loses its elastic force for some reason, the other wave spring can hold the slider 23 . In particular, in this embodiment, the third elastic member 26 is configured such that the wave spring 26B having a relatively large dimension in the vertical direction of the vehicle body is arranged at the center, and the wave springs 26A and 26C having relatively small sizes are arranged at both ends thereof. , the holding performance of the slider 23 can be further enhanced when resonance or the like occurs in one of the wave springs.

次に、第３弾性部材２６について図８、図９を参照してより詳細に説明する。図８は、第１マウント１０Ｂの、車体上下方向に直交しかつ波形バネ２６Ｂの車体上下方向のいずれかの部分を通過する平面に沿った断面図である。図９は、第１マウント１０Ｂと燃料電池スタック２及び前方部材５との接続部付近を示す図である。 Next, the third elastic member 26 will be described in more detail with reference to FIGS. 8 and 9. FIG. FIG. 8 is a cross-sectional view of the first mount 10B taken along a plane perpendicular to the vertical direction of the vehicle body and passing through any portion of the wave spring 26B in the vertical direction of the vehicle body. FIG. 9 is a view showing the vicinity of the connecting portion between the first mount 10B, the fuel cell stack 2, and the front member 5. As shown in FIG.

本実施形態では、例えば波形バネをステンレス鋼で形成し、筒部２２は波形バネよりも熱伝導率の高い材料（例えばアルミニウム）で形成されている。そして、摺動子２３は、固定部２３Ｂが固定される燃料電池スタック２の部位よりも熱伝導率が低い素材（例えばセラミック）で形成されている。当該燃料電池スタック２の部位は、本実施形態ではステー２０になるが、これはエンドプレート２１と同じ材質で形成されている。 In this embodiment, for example, the wave spring is made of stainless steel, and the cylindrical portion 22 is made of a material (for example, aluminum) having higher thermal conductivity than the wave spring. The slider 23 is made of a material (for example, ceramic) having a lower thermal conductivity than the portion of the fuel cell stack 2 to which the fixing portion 23B is fixed. The part of the fuel cell stack 2 is the stay 20 in this embodiment, which is made of the same material as the end plate 21 .

また、波形バネ２６Ｂは摺動部２３Ａ及びガイド部２２Ａのいずれとも接触する。波形バネ２６Ｂと摺動部２３Ａとの接触部をＣ１（図中のクロスハッチを施した部分）、波形バネ２６Ｂとガイド部２２Ａとの接触部をＣ２とすると、全ての接触部Ｃ１（図８では１５か所）の接触面積の合計は、全ての接触部Ｃ２（図８では１２か所）の接触面積の合計よりも大きい。 Also, the wave spring 26B contacts both the sliding portion 23A and the guide portion 22A. Assuming that the contact portion between the wave spring 26B and the sliding portion 23A is C1 (cross hatched portion in the figure) and the contact portion between the wave spring 26B and the guide portion 22A is C2, all the contact portions C1 (Fig. 8 15 places) is larger than the sum of the contact areas of all the contact portions C2 (12 places in FIG. 8).

波形バネ２６Ｃ及び図示していない波形バネ２６Ａについても同様である。また、第４弾性部材２５を構成する波形バネと上蓋２４Ａ、下蓋２４Ｂとの接触面積と波形バネと摺動部２３Ａとの接触面積についても上記と同様であって、波形バネと上蓋２４Ａ、下蓋２４Ｂとの接触面積の方が波形バネと摺動部２３Ａとの接触面積よりも大きい。 The same applies to the wave spring 26C and the wave spring 26A (not shown). The contact area between the wave spring and the upper lid 24A and the lower lid 24B and the contact area between the wave spring and the sliding portion 23A, which constitute the fourth elastic member 25, are the same as above. The contact area with the lower lid 24B is larger than the contact area between the wave spring and the sliding portion 23A.

燃料電池スタック２の熱は、ステー２０を介して摺動子２３へと伝達され、そこから波形バネ２６等を介して筒部２２へ伝達され、筒部２２と前方部材５との接触部を介して前方部材５へと伝達され、前方部材５から外部へと放出される。 The heat of the fuel cell stack 2 is transmitted to the slider 23 via the stay 20, and from there to the cylindrical portion 22 via the wave spring 26 and the like, and the contact portion between the cylindrical portion 22 and the front member 5 is It is transmitted to the front member 5 through the front member 5 and discharged from the front member 5 to the outside.

燃料電池スタック２は運転中に高温になり、良好な電気分解反応のためには高温状態を維持することが望ましい。換言すると、燃料電池スタック２から発電構造体ケースＢの外部への放熱は抑制されることが望ましい。また、第３弾性部材２６及び第４弾性部材２５Ａ、２５Ｂを構成する波形バネ（以下、「波形バネ２６等」という）は、温度が過剰に上昇すると高温クリープにより弾性が消失するおそれがあるので、波形バネ２６等の温度上昇も抑制されることが望ましい。 The fuel cell stack 2 becomes hot during operation and it is desirable to maintain the high temperature for good electrolysis reaction. In other words, it is desirable that heat radiation from the fuel cell stack 2 to the outside of the power generation structure case B is suppressed. In addition, if the temperature of the wave springs constituting the third elastic member 26 and the fourth elastic members 25A and 25B (hereinafter referred to as "the wave springs 26, etc.") increases excessively, there is a risk that the elasticity will be lost due to high-temperature creep. , the temperature rise of the wave spring 26 and the like is also desirably suppressed.

この点、摺動子２３はステー２０よりも熱伝導率が低い素材で形成されているので、燃料電池スタック２から摺動子２３への伝熱を抑制することができる。すなわち、燃料電池スタック２の放熱が抑制されるとともに、摺動子２３からの伝熱による波形バネ２６等の温度上昇も抑制される。 In this regard, since the slider 23 is made of a material having a lower thermal conductivity than the stay 20, heat transfer from the fuel cell stack 2 to the slider 23 can be suppressed. That is, the heat radiation of the fuel cell stack 2 is suppressed, and the temperature rise of the wave spring 26 and the like due to heat transfer from the slider 23 is also suppressed.

また、筒部２２は波形バネ２６等より熱伝導率が高い素材で形成されているので、波形バネ２６等から筒部２２へ熱が逃げ易くなっている。上記の通り摺動子２３から波形バネ２６等への伝熱は抑制されるものの、伝熱を完全に遮断することはできない。しかし、波形バネ２６等から筒部２２へ熱が逃げ易くなっているので、波形バネ２６等の温度上昇を抑制できる。また、波形バネ２６等は、それぞれ１枚板を折り曲げて形成されたものなので、複数の部材の組み合わせからなる構成に比べて伝熱性に優れる。このことも、波形バネ２６等の温度上昇の抑制に寄与する。 In addition, since the cylindrical portion 22 is made of a material having a higher thermal conductivity than the wave springs 26 and the like, heat can easily escape from the wave springs 26 and the like to the cylindrical portion 22 . Although the heat transfer from the slider 23 to the wave spring 26 and the like is suppressed as described above, the heat transfer cannot be completely blocked. However, since heat can easily escape from the wave springs 26 and the like to the cylindrical portion 22, the temperature rise of the wave springs 26 and the like can be suppressed. Moreover, since the wave springs 26 and the like are each formed by bending a single plate, they are superior in heat transferability compared to a structure composed of a combination of a plurality of members. This also contributes to suppressing the temperature rise of the wave spring 26 and the like.

さらに、波形バネ２６等は、筒部２２との接触面積の方が摺動子２３との接触面積よりも大きい形状をしているので、摺動子２３から波形バネ２６等への伝熱が抑制されるとともに、波形バネ２６等に伝わった熱は筒部２２へ逃げ易くなっている。 Furthermore, since the wave spring 26 and the like have a shape in which the contact area with the cylindrical portion 22 is larger than the contact area with the slider 23, heat transfer from the slider 23 to the wave spring 26 and the like is facilitated. In addition to being suppressed, the heat transmitted to the wave spring 26 and the like can easily escape to the cylindrical portion 22 .

なお、波形バネ２６等を、１枚板を折り曲げて形成することで、上記の効果の他に、部品点数の低減による取り付け工数の削減及びコストの削減の効果も得られる。 By forming the wave spring 26 and the like by bending a single plate, in addition to the above effects, it is possible to reduce the number of parts, thereby reducing the number of mounting steps and cost.

また、波形バネ２６等を、筒部２２との接触面積の方が摺動子２３との接触面積よりも大きい形状にすると、上記の効果の他に、筒部２２と波形バネ２６等との接触部の面圧を低下させて、筒部２２の摩耗を低減させることもできる。また、摺動子２３と波形バネ２６等の摺動抵抗を低減することもできる。 Further, if the wave spring 26 and the like are shaped so that the contact area with the cylindrical portion 22 is larger than the contact area with the slider 23, in addition to the above effect, the contact between the cylindrical portion 22 and the wave spring 26 and the like can be enhanced. Wear of the tubular portion 22 can also be reduced by lowering the surface pressure of the contact portion. Also, the sliding resistance of the slider 23 and the wave spring 26 can be reduced.

次に、本実施形態による効果についてまとめる。 Next, the effects of this embodiment will be summarized.

本実施形態の燃料電池システム１は、単セルが積層されてなる少なくとも一個の燃料電池スタック２と、燃料電池スタック２との間でガスの授受を行う補機を含む補機構造体３とが接続されて一体化した発電構造体Ａと、発電構造体Ａを収容する発電構造体ケースＢと、を備える。補機構造体３は発電構造体ケースＢに締結され、燃料電池スタック２は、積層方向の一方の端部が補機構造体３に締結され、補機構造体３とは反対側が、積層方向に変位可能なマウント１０Ａ、１０Ｂ、１１Ａ、１１Ｂを介して発電構造体ケースＢに締結されている。補機構造体３が発電構造体ケースＢに締結されているので、発電構造体Ａのガタつきが抑制される。これによりマウント部分の摩耗や破損を抑制できる。さらに、燃料電池スタック２の補機構造体３とは反対側が、積層方向に変位可能なマウント１０Ａ、１０Ｂ、１１Ａ、１１Ｂを介して発電構造体ケースＢに締結されているので、燃料電池スタック２の膨張／収縮による変位を吸収できる。 The fuel cell system 1 of the present embodiment includes at least one fuel cell stack 2 formed by stacking single cells, and an auxiliary equipment structure 3 including auxiliary equipment for exchanging gas with the fuel cell stack 2. A power generating structure A that is connected and integrated, and a power generating structure case B that houses the power generating structure A are provided. The auxiliary machinery structure 3 is fastened to the power generation structure case B, the fuel cell stack 2 is fastened to the auxiliary machinery structure 3 at one end in the stacking direction, and the side opposite to the auxiliary machinery structure 3 is located in the stacking direction. It is fastened to the power generation structure case B via mounts 10A, 10B, 11A, and 11B that can be displaced. Since the auxiliary machinery structure 3 is fastened to the power generation structure case B, the power generation structure A is restrained from rattling. As a result, wear and damage to the mounting portion can be suppressed. Furthermore, since the side of the fuel cell stack 2 opposite to the auxiliary machinery structure 3 is fastened to the power generation structure case B via the mounts 10A, 10B, 11A, and 11B that are displaceable in the stacking direction, the fuel cell stack 2 can absorb displacement due to expansion/contraction of

本実施形態では、各マウント１０Ａ、１０Ｂ、１１Ａ、１１Ｂは、積層方向に延びかつ両端が蓋２４Ａ、２４Ｂで閉塞されている筒状のガイド部２２Ａを有し発電構造体ケースＢに固定される筒部２２と、ガイド部２２Ａの内側に摺動可能に配置される摺動部２３Ａ及び燃料電池スタック２に固定される固定部２３Ｂを有する摺動子２３を備える。さらに、ガイド部２２Ａと摺動部２３Ａとの隙間に配置されて摺動部２３Ａの積層方向と直交する方向への変位を吸収する第３弾性部材２６を備える。これにより、例えば燃料電池スタック２内の温度分布のバラツキ等により積層方向以外の方向に変位が生じても、第３弾性部材２６のストローク範囲内で吸収できる。また、摺動部２３Ａを筒部２２内に遊びがない状態で保持できるので、フレッティング摩耗を抑制できる。 In this embodiment, each of the mounts 10A, 10B, 11A, and 11B has a cylindrical guide portion 22A that extends in the stacking direction and whose ends are closed with lids 24A and 24B, and is fixed to the power generating structure case B. It includes a cylindrical portion 22 , a slider 23 having a sliding portion 23 A slidably disposed inside the guide portion 22 A, and a fixed portion 23 B fixed to the fuel cell stack 2 . Further, a third elastic member 26 is provided in the gap between the guide portion 22A and the sliding portion 23A to absorb the displacement of the sliding portion 23A in the direction orthogonal to the stacking direction. As a result, even if displacement occurs in a direction other than the stacking direction due to, for example, variations in the temperature distribution within the fuel cell stack 2 , the displacement can be absorbed within the stroke range of the third elastic member 26 . Further, since the sliding portion 23A can be held in the cylindrical portion 22 without play, fretting wear can be suppressed.

本実施形態では、燃料電池システム１は蓋２４Ａ、２４Ｂと摺動部２３Ａとの隙間に配置されて摺動部２３Ａの積層方向への変位を吸収する第４弾性部材２５をさらに備え、第３弾性部材２６材及び第４弾性部材２５は、それぞれバネ定数の異なる２種類の弾性体からなる。これにより、一方の弾性体が共振しても他方で摺動子２３を保持できる。また、一方の弾性体の弾性が消失しても他方で摺動子２３を保持できる。 In this embodiment, the fuel cell system 1 further includes a fourth elastic member 25 disposed between the lids 24A and 24B and the sliding portion 23A to absorb displacement of the sliding portion 23A in the stacking direction. The elastic member 26 material and the fourth elastic member 25 are made of two types of elastic bodies having different spring constants. Thereby, even if one elastic body resonates, the other can hold the slider 23 . Also, even if one elastic body loses its elasticity, the other can hold the slider 23 .

本実施形態では、第３弾性部材２６及び第４弾性部材２５は、板バネを波形に曲げた波形バネである。これにより、つるまきバネ等を用いる場合に比べて筒部２２と摺動部２３Ａとの隙間を詰めることができ、第１マウント１０、第３マウント１１を小型軽量化できる。また、筒部２２内でも摺動子２３の姿勢を一定に保持できる。 In this embodiment, the third elastic member 26 and the fourth elastic member 25 are wavy springs obtained by bending a leaf spring into a wavy shape. As a result, the gap between the tubular portion 22 and the sliding portion 23A can be narrowed compared to the case where a helical spring or the like is used, and the size and weight of the first mount 10 and the third mount 11 can be reduced. Also, the posture of the slider 23 can be kept constant even within the cylindrical portion 22 .

本実施形態では、第３弾性部材２６及び第４弾性部材２５は、ガイド部２２Ａとの接触面積の方が摺動部２３Ａとの接触面積より大きい形状を有する。これにより、第３弾性部材２６及び第４弾性部材２５から筒部２２への放熱を促進し、かつ摺動部２３Ａからの熱伝導を抑制できるので、第３弾性部材２６及び第４弾性部材２５の劣化を抑制できる。また、筒部２２との接触面圧を低減できるので、筒部２２の摩耗を低減できる。また、第３弾性部材２６及び第４弾性部材２５摺動部２３Ａとの摺動抵抗を低減できるので、摺動子２３の動きを滑らかにできる。 In this embodiment, the third elastic member 26 and the fourth elastic member 25 have a shape in which the contact area with the guide portion 22A is larger than the contact area with the sliding portion 23A. As a result, heat dissipation from the third elastic member 26 and the fourth elastic member 25 to the cylindrical portion 22 can be promoted, and heat conduction from the sliding portion 23A can be suppressed. deterioration can be suppressed. Moreover, since the contact surface pressure with the cylindrical portion 22 can be reduced, wear of the cylindrical portion 22 can be reduced. Moreover, since the sliding resistance between the third elastic member 26 and the fourth elastic member 25 sliding portion 23A can be reduced, the movement of the slider 23 can be made smooth.

本実施形態では、第３弾性部材２６を構成する２種類の弾性体は、それぞれ、１つの波形バネを、摺動部２３Ａを囲む形状に加工したものである。これにより、複数の部材で構成するよりも伝熱性が高まり、第３弾性部材２６の温度上昇を抑制できる。また、部品点数が少なくて済むので、コストを削減できる。 In this embodiment, each of the two types of elastic bodies forming the third elastic member 26 is formed by processing one wave spring into a shape surrounding the sliding portion 23A. As a result, the heat transfer property is higher than when the third elastic member 26 is configured with a plurality of members, and the temperature rise of the third elastic member 26 can be suppressed. Also, since the number of parts is small, the cost can be reduced.

本実施形態では、第３弾性部材２６は、２種類の弾性体のうちの一方の弾性体２６Ａ、２６Ｃが積層方向に２分割され、２分割された弾性体２６Ａ、２６Ｃが２種類の弾性体のうちの他方の弾性体２６Ｂを積層方向の両側から挟む構成を有する。そして、２分割されていない弾性体２６Ｂの積層方向の寸法は、２分割された弾性体２６Ａ、２６Ｃのそれぞれの積層方向の寸法を足したもの以上である。すなわち、積層方向の寸法が大きい弾性体２６Ｂで摺動部２３Ａの中央部分を支え、積層方向の寸法が小さい弾性体２６Ａ、２６Ｃでその両側を支える。これにより、一方の弾性体に共振や破損が生じた際でも摺動子２３を安定的に保持できる。 In the present embodiment, the third elastic member 26 is composed of two types of elastic bodies 26A and 26C, which are one of the two types of elastic bodies, and are divided into two in the stacking direction. The other elastic body 26B is sandwiched from both sides in the stacking direction. The dimension in the stacking direction of the elastic body 26B that is not divided into two is equal to or greater than the sum of the dimensions in the stacking direction of each of the elastic bodies 26A and 26C that are divided into two. That is, the central portion of the sliding portion 23A is supported by the elastic body 26B having a large dimension in the stacking direction, and both sides are supported by the elastic bodies 26A and 26C having a small dimension in the stacking direction. As a result, the slider 23 can be stably held even when resonance or breakage occurs in one of the elastic bodies.

本実施形態では、筒部２２は、第３弾性部材２６及び第４弾性部材２５よりも熱伝導率が高い素材で形成されている。これにより、摺動部２３Ａから第３弾性部材２６及び第４弾性部材２５に伝わった熱が筒部２２に逃げ易くなるので、第３弾性部材２６及び第４弾性部材２５の温度上昇を抑制して第３弾性部材２６及び第４弾性部材２５の信頼性を向上させることができる。 In this embodiment, the cylindrical portion 22 is made of a material having higher thermal conductivity than the third elastic member 26 and the fourth elastic member 25 . As a result, the heat transmitted from the sliding portion 23A to the third elastic member 26 and the fourth elastic member 25 can easily escape to the cylindrical portion 22, so that the temperature rise of the third elastic member 26 and the fourth elastic member 25 can be suppressed. Therefore, the reliability of the third elastic member 26 and the fourth elastic member 25 can be improved.

本実施形態では、摺動子２３は、固定部２３Ｂが固定される燃料電池スタック２の部位（本実施形態ではステー２０）よりも熱伝導率が低い素材で形成されている。
これにより、燃料電池スタック２から摺動子２３への熱伝導を抑制し、ひいては摺動子２３から第３弾性部材２６及び第４弾性部材２５への熱伝導を抑制できる。また、燃料電池スタック２から摺動子２３への熱伝導が抑制されることで、燃料電池スタック２の温度低下が抑制されるので、燃料電池スタック２の効率向上を図ることができる。 In this embodiment, the slider 23 is made of a material having a lower thermal conductivity than the part of the fuel cell stack 2 (the stay 20 in this embodiment) to which the fixing part 23B is fixed.
Thereby, heat conduction from the fuel cell stack 2 to the slider 23 can be suppressed, and heat conduction from the slider 23 to the third elastic member 26 and the fourth elastic member 25 can be suppressed. In addition, by suppressing the heat conduction from the fuel cell stack 2 to the slider 23, the temperature drop of the fuel cell stack 2 is suppressed, so the efficiency of the fuel cell stack 2 can be improved.

[第２実施形態]
次に、第２実施形態について説明する。 [Second embodiment]
Next, a second embodiment will be described.

本実施形態の燃料電池システム１は、筒部２２と摺動部２３Ａとの車体上下方向の隙間に、上述した第４弾性部材２５に換えて、または第４弾性部材２５とともに、第１弾性部材２７及び第２弾性部材２８を備える。 In the fuel cell system 1 of this embodiment, instead of or together with the fourth elastic member 25, a first elastic member is inserted in the vertical direction of the vehicle body between the cylindrical portion 22 and the sliding portion 23A. 27 and a second elastic member 28 .

第１弾性部材２７は、燃料電池スタック２の膨張時に間隔が狭くなる方の隙間、つまり上蓋２４Ａと摺動部２３Ａの上面との間に配置される。 The first elastic member 27 is arranged between the gap that narrows when the fuel cell stack 2 expands, that is, between the upper lid 24A and the upper surface of the sliding portion 23A.

図１０に示す通り、第１弾性部材２７は、自由長Ｘ１が上蓋２４Ａと燃料電池スタック２が最収縮状態のときの摺動部２３Ａの上面との間隔Ｙ１以上である。これにより、第１弾性部材２７が摺動部２３Ａと上蓋２４Ａの間で遊ぶことがなくなる。 As shown in FIG. 10, the free length X1 of the first elastic member 27 is equal to or greater than the distance Y1 between the upper lid 24A and the upper surface of the sliding portion 23A when the fuel cell stack 2 is in the most contracted state. As a result, the first elastic member 27 does not play between the sliding portion 23A and the upper lid 24A.

そして、第１弾性部材２７は、第１バネ定数ｋ１の部分(以下、第１部分という)２７Ａと、第１バネ定数ｋ１より大きい第２バネ定数ｋ２の部分(以下、第２部分という)２７Ｂとからなる。第１部分２７Ａ及び第２部分２７Ｂは、いずれも第１実施形態で説明したものと同様の波形バネである。第１弾性部材２７は、例えば図１０に示すように、第１部分２７Ａの山部と第２部分２７Ｂの谷部とが接するように、これらの波形バネを積層方向に重ねたものである。 The first elastic member 27 has a portion (hereinafter referred to as the first portion) 27A with the first spring constant k1 and a portion (hereinafter referred to as the second portion) 27B with the second spring constant k2 larger than the first spring constant k1. Consists of The first portion 27A and the second portion 27B are both wave springs similar to those described in the first embodiment. For example, as shown in FIG. 10, the first elastic member 27 is obtained by stacking these wave springs in the stacking direction so that the peaks of the first portion 27A and the valleys of the second portion 27B are in contact with each other.

第１バネ定数ｋ１は、燃料電池スタック２の膨張に伴う摺動部２３Ａの変位を吸収可能なバネ定数である。なお、第１部分２７Ａのストロークは、燃料電池スタック２の膨張／収縮に伴う摺動部２３Ａの変位幅以上である。 The first spring constant k1 is a spring constant capable of absorbing the displacement of the sliding portion 23A due to the expansion of the fuel cell stack 2. FIG. The stroke of the first portion 27A is equal to or greater than the displacement width of the sliding portion 23A due to expansion/contraction of the fuel cell stack 2. FIG.

第２バネ定数ｋ２は、燃料電池スタック２が最膨張状態で車体上下方向（つまり積層方向）の入力があった場合でも当該入力による摺動部２３Ａの変位を吸収可能なバネ定数である。換言すると、第２バネ定数ｋ２は、燃料電池スタック２が最膨張状態で車体上下方向の重力があった場合に、摺動部２３Ａの車体上下方向の変位を許容できる範囲に抑えられるバネ定数である。 The second spring constant k2 is a spring constant capable of absorbing displacement of the sliding portion 23A due to an input in the vertical direction of the vehicle body (that is, stacking direction) when the fuel cell stack 2 is in the fully expanded state. In other words, the second spring constant k2 is a spring constant that suppresses the displacement of the sliding portion 23A in the vertical direction of the vehicle body to an allowable range when the fuel cell stack 2 is in the fully expanded state and there is gravity in the vertical direction of the vehicle body. be.

第２弾性部材２８は、燃料電池スタック２の収縮時に間隔が狭くなる方の隙間、つまり下蓋２４Ｂと摺動部２３Ａの下面との間に配置される。 The second elastic member 28 is arranged between the gap that narrows when the fuel cell stack 2 contracts, that is, between the lower lid 24B and the lower surface of the sliding portion 23A.

図１１に示す通り、第２弾性部材２８は、自由長Ｘ２が下蓋２４Ｂと燃料電池スタック２が最膨張状態のときの摺動部２３Ａの下面との間隔Ｙ２以上である。これにより、第２弾性部材２８が摺動部２３Ａと下蓋２４Ｂの間で遊ぶことがなくなる。 As shown in FIG. 11, the free length X2 of the second elastic member 28 is equal to or greater than the distance Y2 between the lower lid 24B and the lower surface of the sliding portion 23A when the fuel cell stack 2 is in the most expanded state. As a result, the second elastic member 28 does not play between the sliding portion 23A and the lower lid 24B.

そして、第２弾性部材２８は、第３バネ定数ｋ３の部分（以下、第３部分という）２８Ａと、第３バネ定数ｋ３より大きい第４バネ定数ｋ４の部分（以下、第４部分という）２８Ｂとからなる。第３部分２８Ａ及び第４部分２８Ｂは、いずれも第１実施形態で説明したものと同様の波形バネである。第２弾性部材２８は、例えば図１１に示すように、第３部分２８Ａの谷部と第４部分２８Ｂの谷部とが接するように、これらの波形バネを積層方向に重ねたものである。 The second elastic member 28 has a portion 28A with a third spring constant k3 (hereinafter referred to as a third portion) and a portion 28B with a fourth spring constant k4 larger than the third spring constant k3 (hereinafter referred to as a fourth portion) 28B. Consists of Both the third portion 28A and the fourth portion 28B are wave springs similar to those described in the first embodiment. For example, as shown in FIG. 11, the second elastic member 28 is obtained by stacking these wave springs in the stacking direction so that the valleys of the third portion 28A and the valleys of the fourth portion 28B are in contact with each other.

第３バネ定数ｋ３は、燃料電池スタック２の収縮に伴う摺動部２３Ａの変位を吸収可能なバネ定数である。なお、第３部分２８Ａのストロークは、燃料電池スタック２の膨張／収縮に伴う摺動部２３Ａの変位幅以上である。 The third spring constant k3 is a spring constant capable of absorbing the displacement of the sliding portion 23A due to contraction of the fuel cell stack 2 . The stroke of the third portion 28A is equal to or greater than the displacement width of the sliding portion 23A due to expansion/contraction of the fuel cell stack 2. FIG.

第４バネ定数ｋ４は、燃料電池スタック２が最収縮状態で車体上下方向の入力があった場合でも当該入力による摺動部２３Ａの変位を吸収可能なバネ定数である。換言すると、第４バネ定数ｋ４は、燃料電池スタック２が最収縮状態で車体上下方向の重力があった場合に、摺動部２３Ａの車体上下方向の変位を許容できる範囲に抑えられるバネ定数である。 The fourth spring constant k4 is a spring constant capable of absorbing the displacement of the sliding portion 23A due to an input in the vertical direction of the vehicle body when the fuel cell stack 2 is in the most contracted state. In other words, the fourth spring constant k4 is a spring constant that suppresses the displacement of the sliding portion 23A in the vertical direction of the vehicle body to an allowable range when the fuel cell stack 2 is in the most contracted state and there is a gravitational force in the vertical direction of the vehicle body. be.

なお、本実施形態では、第１バネ定数ｋ１と第３バネ定数ｋ３が等しく、第２バネ定数ｋ２と第４バネ定数ｋ４が等しい。また、第１弾性部材２７及び第２弾性部材２８を第４弾性部材２５とともに用いる場合には、例えば、第１弾性部材２７を上側の２つの第４弾性部材２５Ａで挟み、第２弾性部材２８と下側の２つの第４弾性部材２５Ｂで挟むように配置すればよい。この場合、第４弾性部材２５が遊ばないように第４弾性部材２５の自由長を設定する。 In this embodiment, the first spring constant k1 and the third spring constant k3 are equal, and the second spring constant k2 and the fourth spring constant k4 are equal. When the first elastic member 27 and the second elastic member 28 are used together with the fourth elastic member 25, for example, the first elastic member 27 is sandwiched between the upper two fourth elastic members 25A, and the second elastic member 28 is and the lower two fourth elastic members 25B. In this case, the free length of the fourth elastic member 25 is set so that the fourth elastic member 25 does not play.

上記構成により、燃料電池スタック２の膨張／収縮による変位を第１部分２７Ａと第３部分２８Ａで許容しつつ、燃料電池スタック２を変位とは反対方向に押し付けることで確実に保持できる。そして、車体外部から大きな入力があった場合でも、第２部分２７Ｂと第４部分２８Ｂにより当該入力を緩和して燃料電池スタック２を確実に保持できる。 With the above configuration, displacement due to expansion/contraction of the fuel cell stack 2 is allowed by the first portion 27A and the third portion 28A, and the fuel cell stack 2 can be reliably held by pressing in the direction opposite to the displacement. Even if there is a large input from the outside of the vehicle body, the second portion 27B and the fourth portion 28B mitigate the input, so that the fuel cell stack 2 can be held securely.

なお、第１弾性部材２７及び第２弾性部材２８は、第３弾性部材２６及び第４弾性部材２５と同様の素材で形成されている。また、第１弾性部材２７又は第２弾性部材２８のいずれか一方のみを備える構成としてもよい。 The first elastic member 27 and the second elastic member 28 are made of the same material as the third elastic member 26 and the fourth elastic member 25 . Alternatively, only one of the first elastic member 27 and the second elastic member 28 may be provided.

以上の通り本実施形態では、各マウント１０Ａ、１０Ｂ、１１Ａ、１１Ｂは、積層方向に延びかつ両端が蓋２４Ａ、２４Ｂで閉塞されている筒状のガイド部２２Ａを有し発電構造体ケース３Ｂに固定される筒部２２と、ガイド部２２Ａの内側に摺動可能に配置される摺動部２３Ａ及び燃料電池スタック２に固定される固定部２３Ｂを有する摺動子２３を備える。さらに、蓋２４Ａ、２４Ｂと摺動部２３Ａとの隙間のうち、燃料電池スタック２の膨張時に間隔が狭くなる方の隙間に配置される第１弾性部材２７を備える。これにより、燃料電池スタック２の膨張による変位を許容しつつ、燃料電池スタック２に圧縮荷重を掛けることができるので、燃料電池スタック２を確実に保持することができる。 As described above, in the present embodiment, each of the mounts 10A, 10B, 11A, and 11B has a cylindrical guide portion 22A that extends in the stacking direction and whose ends are closed by lids 24A and 24B, and is attached to the power generating structure case 3B. The slider 23 has a fixed cylindrical portion 22 , a sliding portion 23 A slidably disposed inside the guide portion 22 A, and a fixed portion 23 B fixed to the fuel cell stack 2 . Further, a first elastic member 27 is arranged in a gap between the lids 24A, 24B and the sliding portion 23A, which narrows when the fuel cell stack 2 expands. As a result, a compressive load can be applied to the fuel cell stack 2 while allowing displacement due to expansion of the fuel cell stack 2, so that the fuel cell stack 2 can be reliably held.

本実施形態では、第１弾性部材２７は、自由長Ｘ１が上蓋２４Ａと燃料電池スタック２が最収縮状態のときの摺動部２３Ａとの間隔Ｙ１以上であり、かつ燃料電池スタック２の膨張に伴う摺動部２３Ａの変位を吸収可能な第１バネ定数ｋ１の部分と、第１バネ定数ｋ１より大きく、燃料電池スタック２が最膨張状態で積層方向の入力があった場合でも当該入力による摺動部２３Ａの変位を吸収可能な第２バネ定数ｋ２の部分とからなる。これにより、上蓋２４Ａと摺動部２３Ａの間での第１弾性部材２７の遊びがなくなるので、フレッティング摩耗を抑制できる。さらに、第１バネ定数ｋ１の部分で燃料電池スタック２の膨張／収縮による変位を吸収し、第２バネ定数ｋ２の部分で外部からの入力を緩和して、燃料電池スタック２を確実に保持できる。 In the present embodiment, the free length X1 of the first elastic member 27 is equal to or greater than the distance Y1 between the upper lid 24A and the sliding portion 23A when the fuel cell stack 2 is in the most contracted state, and the expansion of the fuel cell stack 2 is and a portion having a first spring constant k1 capable of absorbing the displacement of the sliding portion 23A that accompanies the sliding portion 23A. and a portion having a second spring constant k2 capable of absorbing the displacement of the moving portion 23A. This eliminates the play of the first elastic member 27 between the upper lid 24A and the sliding portion 23A, thereby suppressing fretting wear. Furthermore, the portion with the first spring constant k1 absorbs the displacement due to the expansion/contraction of the fuel cell stack 2, and the portion with the second spring constant k2 relaxes the input from the outside, so that the fuel cell stack 2 can be held securely. .

本実施形態では、各マウント１０Ａ、１０Ｂ、１１Ａ、１１Ｂは、蓋２４Ａ、２４Ｂと摺動部２３Ａとの隙間のうち、燃料電池スタックの収縮時に間隔が狭くなる方の隙間に配置される第２弾性部材２８を備える。これにより、燃料電池スタック２の収縮による変位を許容しつつ、燃料電池スタック２に圧縮荷重を掛けることができるので、燃料電池スタック２を確実に保持することができる。 In this embodiment, each of the mounts 10A, 10B, 11A, and 11B is arranged in the second gap between the lids 24A and 24B and the sliding portion 23A, which narrows when the fuel cell stack contracts. An elastic member 28 is provided. As a result, a compressive load can be applied to the fuel cell stack 2 while allowing displacement due to contraction of the fuel cell stack 2, so that the fuel cell stack 2 can be reliably held.

本実施形態では、第２弾性部材２８は、自由長Ｘ２が下蓋２４Ｂと燃料電池スタック２が最膨張状態のときの摺動部２３Ａとの間隔Ｙ２以上であり、かつ燃料電池スタック２の収縮に伴う摺動部２３Ａの変位を吸収可能な第３バネ定数ｋ３の部分と、第３バネ定数ｋ３より大きく、燃料電池スタック２が最収縮状態で積層方向の入力があった場合でも当該入力による摺動部２３Ａの変位を吸収可能な第４バネ定数ｋ４の部分とからなる。これにより、下蓋２４Ｂと摺動部２３Ａの間での第２弾性部材２８の遊びがなくなるので、フレッティング摩耗を抑制できる。さらに、第３バネ定数ｋ３の部分で燃料電池スタック２の膨張／収縮による変位を吸収し、第４バネ定数ｋ４の部分で外部からの入力を緩和して、燃料電池スタック２を確実に保持できる。 In this embodiment, the free length X2 of the second elastic member 28 is equal to or greater than the distance Y2 between the lower lid 24B and the sliding portion 23A when the fuel cell stack 2 is in the most expanded state, and the fuel cell stack 2 contracts. and a portion with a third spring constant k3 capable of absorbing the displacement of the sliding portion 23A due to the displacement of the sliding portion 23A. and a portion with a fourth spring constant k4 capable of absorbing the displacement of the sliding portion 23A. This eliminates the play of the second elastic member 28 between the lower lid 24B and the sliding portion 23A, thereby suppressing fretting wear. Further, the portion with the third spring constant k3 absorbs the displacement due to the expansion/contraction of the fuel cell stack 2, and the portion with the fourth spring constant k4 relaxes the input from the outside, so that the fuel cell stack 2 can be securely held. .

なお、上記各実施形態では本発明を車載用の燃料電池システム１に適用する場合について説明したが、定置用またはポータブルタイプにも同様に適用可能である。 In addition, although the case where the present invention is applied to the vehicle-mounted fuel cell system 1 has been described in each of the above-described embodiments, it can also be applied to a stationary or portable type.

また、本発明は上記の実施の形態に限定されるわけではなく、特許請求の範囲に記載の技術的思想の範囲内で様々な変更を成し得ることは言うまでもない。 Moreover, it goes without saying that the present invention is not limited to the above-described embodiments, and that various modifications can be made within the scope of the technical idea described in the claims.

１ 車載用燃料電池システム、 ２ 燃料電池スタック、 ３ 補機構造体、 ４ 配線、 ５ 前方部材、 ６ 後方部材、 ７ 電装ユニット、 １０Ａ，１０Ｂ 第１マウント、 １１Ａ、１１Ｂ 第３マウント、 １３ 排気管、 １４ 補強部、 １５ ボルト穴、 １６ ボルト、 ２２ 筒部、 ２３ 摺動子、 ２４ 蓋、 ２５Ａ、２５Ｂ 第４弾性部材、 ２６ 第３弾性部材、 ２７ 第１弾性部材、 ２８ 第２弾性部材 Reference Signs List 1 in-vehicle fuel cell system 2 fuel cell stack 3 accessory structure 4 wiring 5 front member 6 rear member 7 electrical unit 10A, 10B first mount 11A, 11B third mount 13 exhaust pipe , 14 reinforcement portion, 15 bolt hole, 16 bolt, 22 cylindrical portion, 23 slider, 24 lid, 25A, 25B fourth elastic member, 26 third elastic member, 27 first elastic member, 28 second elastic member

Claims (13)

単セルが積層されてなる少なくとも一個の燃料電池スタックと、前記燃料電池スタックとの間でガスの授受を行う補機を含む補機構造体とが接続されて一体化した発電構造体と、
前記発電構造体を収容する発電構造体ケースと、
を備える燃料電池システムにおいて、
前記補機構造体は前記発電構造体ケースに締結され、
前記燃料電池スタックは、積層方向の一方の端部が前記補機構造体に締結され前記補機構造体とは反対側が前記積層方向に変位可能なマウントを介して前記発電構造体ケースに締結されていることを特徴とする燃料電池システム。 a power generation structure in which at least one fuel cell stack formed by stacking single cells and an accessory structure including accessories for exchanging gas with the fuel cell stack are connected and integrated;
a power generating structure case that houses the power generating structure;
In a fuel cell system comprising
The accessory structure is fastened to the power generation structure case,
The fuel cell stack is fastened to the accessory structure at one end in the stacking direction, and is fastened to the power generation structure case via a mount displaceable in the stacking direction at the side opposite to the accessory structure. A fuel cell system characterized by: 請求項１に記載の燃料電池システムにおいて、
前記マウントは、
前記積層方向に延びかつ両端が蓋で閉塞されている筒状のガイド部を有し前記発電構造体ケースに固定される筒部と、
前記ガイド部の内側に摺動可能に配置される摺動部及び前記燃料電池スタックに固定される固定部を有する摺動子と、
前記蓋と前記摺動部との隙間のうち、前記燃料電池スタックの膨張時に間隔が狭くなる方の前記隙間に配置される第１弾性部材と、
を備える、燃料電池システム。 In the fuel cell system according to claim 1,
The mount is
a cylindrical portion that extends in the stacking direction and has a cylindrical guide portion that is closed at both ends with lids and is fixed to the power generating structure case;
a slider having a sliding portion slidably disposed inside the guide portion and a fixed portion fixed to the fuel cell stack;
a first elastic member disposed in a gap between the lid and the sliding portion that narrows when the fuel cell stack expands;
a fuel cell system. 請求項２に記載の燃料電池システムにおいて、
前記第１弾性部材は、自由長が前記蓋と前記燃料電池スタックが最収縮状態のときの前記摺動部との間隔以上であり、かつ前記燃料電池スタックの膨張に伴う前記摺動部の変位を吸収可能な第１バネ定数の部分と、前記第１バネ定数より大きく、前記燃料電池スタックが最膨張状態で前記積層方向の入力があった場合でも当該入力による前記摺動部の変位を吸収可能な第２バネ定数の部分と、からなる、燃料電池システム。 In the fuel cell system according to claim 2,
The first elastic member has a free length equal to or greater than the distance between the lid and the sliding portion when the fuel cell stack is in the most contracted state, and displacement of the sliding portion due to expansion of the fuel cell stack. and a first spring constant larger than the first spring constant that absorbs the displacement of the sliding portion caused by the input even when there is an input in the stacking direction when the fuel cell stack is in the most expanded state. and a portion of a possible second spring constant. 請求項１に記載の燃料電池システムにおいて、
前記マウントは、
前記積層方向に延びかつ両端が蓋で閉塞されている筒状のガイド部を有し前記発電構造体ケースに固定される筒部と、
前記ガイド部の内側に摺動可能に配置される摺動部及び前記燃料電池スタックに固定される固定部を有する摺動子と、
前記蓋と前記摺動部との隙間のうち、前記燃料電池スタックの収縮時に間隔が狭くなる方の前記隙間に配置される第２弾性部材と、
を備える、燃料電池システム。 In the fuel cell system according to claim 1,
The mount is
a cylindrical portion that extends in the stacking direction and has a cylindrical guide portion that is closed at both ends with lids and is fixed to the power generating structure case;
a slider having a sliding portion slidably disposed inside the guide portion and a fixed portion fixed to the fuel cell stack;
a second elastic member disposed in a gap between the lid and the sliding portion, the gap being narrower when the fuel cell stack is contracted;
a fuel cell system. 請求項４に記載の燃料電池システムにおいて、
前記第２弾性部材は、自由長が前記蓋と前記燃料電池スタックが最膨張状態のときの前記摺動部との間隔以上であり、かつ前記燃料電池スタックの収縮に伴う前記摺動部の変位を吸収可能な第３バネ定数の部分と、前記第３バネ定数より大きく、前記燃料電池スタックが最収縮状態で前記積層方向の入力があった場合でも当該入力による前記摺動部の変位を吸収可能な第４バネ定数の部分と、からなる、燃料電池システム。 In the fuel cell system according to claim 4,
The second elastic member has a free length equal to or greater than the distance between the lid and the sliding portion when the fuel cell stack is in the most expanded state, and displacement of the sliding portion due to contraction of the fuel cell stack. and a third spring constant larger than the third spring constant that absorbs the displacement of the sliding portion caused by the input even when there is an input in the stacking direction when the fuel cell stack is in the most contracted state. A possible fourth spring constant portion. 請求項１に記載の燃料電池システムにおいて、
前記マウントは、
前記積層方向に延びかつ両端が蓋で閉塞されている筒状のガイド部を有し前記発電構造体ケースに固定される筒部と、
前記ガイド部の内側に摺動可能に配置される摺動部及び前記燃料電池スタックに固定される固定部を有する摺動子と、
前記ガイド部と前記摺動部との隙間に配置されて前記摺動部の前記積層方向と直交する方向への変位を吸収する第３弾性部材と、
を備える燃料電池システム。 In the fuel cell system according to claim 1,
The mount is
a cylindrical portion that extends in the stacking direction and has a cylindrical guide portion that is closed at both ends with lids and is fixed to the power generating structure case;
a slider having a sliding portion slidably disposed inside the guide portion and a fixed portion fixed to the fuel cell stack;
a third elastic member arranged in a gap between the guide portion and the sliding portion to absorb displacement of the sliding portion in a direction orthogonal to the stacking direction;
a fuel cell system. 請求項６に記載の燃料電池システムにおいて、
前記蓋と前記摺動部との隙間に配置されて前記摺動部の前記積層方向への変位を吸収する第４弾性部材をさらに備え、
前記第３弾性部材及び前記第４弾性部材は、それぞれバネ定数の異なる２種類の弾性体からなる、燃料電池システム。 In the fuel cell system according to claim 6,
further comprising a fourth elastic member arranged in a gap between the lid and the sliding portion to absorb displacement of the sliding portion in the stacking direction;
The fuel cell system, wherein the third elastic member and the fourth elastic member are composed of two types of elastic bodies having different spring constants. 請求項７に記載の燃料電池システムにおいて、
前記第３弾性部材及び前記第４弾性部材は、板バネを波形に曲げた波形バネである、燃料電池システム。 In the fuel cell system according to claim 7,
The fuel cell system, wherein the third elastic member and the fourth elastic member are wavy springs obtained by bending a leaf spring into a wavy shape. 請求項８に記載の燃料電池システムにおいて、
前記第３弾性部材及び前記第４弾性部材は、前記ガイド部との接触面積の方が前記摺動部との接触面積より大きい形状を有する、燃料電池システム。 In the fuel cell system according to claim 8,
The fuel cell system, wherein the third elastic member and the fourth elastic member have a shape in which a contact area with the guide portion is larger than a contact area with the sliding portion. 請求項８または９に記載の燃料電池システムにおいて、
前記第３弾性部材を構成する２種類の前記弾性体は、それぞれ、１つの前記波形バネを、前記摺動部を囲む形状に加工したものである、燃料電池システム。 In the fuel cell system according to claim 8 or 9,
The fuel cell system, wherein each of the two types of elastic bodies constituting the third elastic member is obtained by processing one wave spring into a shape surrounding the sliding portion. 請求項７に記載の燃料電池システムにおいて、
前記第３弾性部材は、前記２種類の弾性体のうちの一方の弾性体が前記積層方向に２分割され、２分割された前記弾性体が前記２種類の弾性体のうちの他方の弾性体を前記積層方向の両側から挟む構成を有し、
２分割されていない前記弾性体の前記積層方向の寸法は、２分割された前記弾性体のそれぞれの前記積層方向の寸法を足したもの以上である、燃料電池システム。 In the fuel cell system according to claim 7,
In the third elastic member, one of the two types of elastic bodies is divided into two in the stacking direction, and the divided elastic body is the other of the two types of elastic bodies. is sandwiched from both sides in the stacking direction,
The fuel cell system according to claim 1, wherein the dimension in the stacking direction of the elastic body that is not divided into two is equal to or greater than the sum of the dimensions in the stacking direction of each of the elastic bodies that have been divided into two. 請求項６に記載の燃料電池システムにおいて、
前記筒部は、前記第３弾性部材よりも熱伝導率が高い素材で形成されている、燃料電池システム。 In the fuel cell system according to claim 6,
The fuel cell system according to claim 1, wherein the cylindrical portion is made of a material having higher thermal conductivity than the third elastic member. 請求項２、４または６のいずれか一項に記載の燃料電池システムにおいて、
前記摺動子は、前記固定部が固定される前記燃料電池スタックの部位よりも熱伝導率が低い素材で形成されている、燃料電池システム。 In the fuel cell system according to any one of claims 2, 4 or 6,
The fuel cell system according to claim 1, wherein the slider is formed of a material having a lower thermal conductivity than a portion of the fuel cell stack to which the fixing portion is fixed.
JP2021197989A 2021-12-06 2021-12-06 Fuel battery system Pending JP2023083959A (en)

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