JP5196411B2 - Fuel cell stack device - Google Patents

Description

  The present invention relates to a fuel cell stack device in which a plurality of cells are stacked.

  The fuel cell stack device is formed by stacking a plurality of cells in the thickness direction. In Patent Document 1, as shown in FIG. 17, one bent end portion 101X of the tension member 100X is applied to the end surface of one end plate 201X in the stacking direction of the stack 200X, and the other bent end portion of the tension member 100X. A stack device is disclosed in which 102X is applied to the end face of the other end plate 202X in the stacking direction of the stack 200X, and the stack 200X is fastened by a bolt 300X.

  In Patent Document 2, as shown in FIG. 18, four tension members 500X are provided, and one bent end portion 501X in the length direction of each tension member 500X is connected to one end plate 601X in the stacking direction of the stack 600X. The other bent end in the length direction of each tension member 500X is engaged with the corner of the other end plate in the stacking direction of the stack 600X. I have to.

Patent Document 3 discloses a stack structure in which the entire stack is surrounded by an endless strip. When the nut is tightened, the endless strip plate is tightened. Patent Document 4 also discloses a stack structure in which the entire stack is surrounded by an endless band. In this case, if the nut is tightened, the endless band is tightened.
JP 2004-362940 A JP 2002-042852 A JP 2002-063929 A JP 2000-67902 A

  According to the technique according to Patent Document 1 described above, as shown in FIG. 17, the bent end portions 101X and 102X of the tension member 100X are not the corners of the rectangular end plate of the stack 200X, but the immediate sides of the end plate. It is engaged with the middle part of the part. According to this, although the displacement along the stacking direction of the stack 200X can be supported by the bent end portions 101X and 102X of the tension member 100X, four tension members 100X are provided independently from each other. Thus, four tension members 100X are required, and the number of parts is increasing.

  Furthermore, according to the technique according to Patent Document 2 described above, as shown in FIG. 18, the bent end portion 501X of the tension member 500X is engaged with the corner portion of the rectangular end plate 601X of the stack 600X. The tension members 500X are provided independently from each other in a separated state. Thus, four tension members 500X are required, and the number of parts is increasing.

  Further, according to the techniques according to Patent Documents 3 and 4, there is a possibility that the stack tightening force varies depending on the amount of rotation of the nut. For this reason, the tightening force of the stack may vary depending on the operator, which is not preferable.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a fuel cell stack device that is advantageous in reducing the number of parts.

A fuel cell stack device according to the present invention includes a laminate formed by laminating a plurality of cells having a substantially rectangular planar shape in the thickness direction, and corner portions disposed on both ends of the laminate in the stacking direction. A stack having an end plate with
A pressure plate disposed between one of said end plates and said laminate,
A tension member extending in the stacking direction of the stack;
Provided between one of said end plates and said pressure plate, which comprises a spring member having a spring force which biases in a direction to close the respective cells each other of said stacks through said tension member,
The tension member is
A plate-like tension member main body extending in the stacking direction of the stack;
A first engagement portion that is provided on the tension member main body and engages with two corner portions on one end side in the stacking direction of the stack;
A second engaging portion that is provided on the tension member main body and engages with two corners on the other end side in the stacking direction of the stack ,
The first engagement portion and the second engagement portion are integrally connected to one tension member body,
Provided in the vicinity of the center of each long side of the tension member, the width D1 in the vicinity of the center of the tension member main body is smaller than the width D2 of the short side of the tension member, and the side surface of the cell stack is it characterized in that it has a notch-like opening so as to expose.

  The tension member has a tension member main body extending in the stacking direction of the stack, and a first engagement portion and a second engagement portion provided on the tension member main body. The first engaging portion engages with two corner portions on one side in the stacking direction of the stack. The second engagement portions engage with the two corner portions on the other side in the stacking direction of the stack. If the tension member is mounted on the stack in this way, the two corner portions on one side in the stacking direction of the stack can be held by the first engagement portion. The second engaging portion can hold the two corners on the other side in the stacking direction of the stack.

  According to the present invention, if one tension member is provided in the stack, the two corners on one side in the stacking direction of the stack can be held together by the first engaging portion of the tension member. Moreover, the two corner portions on the other side in the stacking direction of the stack can be held together by the second engaging portion of the tension member. This reduces the number of parts.

  A fuel cell stack device is formed by stacking a plurality of cells in a thickness direction and forming a substantially rectangular parallelepiped stack having corners, a tension member extending in the stacking direction of the stack, and a stack via the tension member And a spring member having a spring force in a direction in which the cells are brought into close contact with each other. The cells may be stacked along the height direction or may be stacked along the horizontal direction. Examples of the spring member include a disc spring, a coil spring, and a leaf spring.

The tension member includes a flat plate-like tension member main body extending in the stacking direction of the stack, and a first engagement portion that is provided on the tension member main body and engages with two corners on one side in the stacking direction of the stack. And a second engaging portion that is provided on the tension member main body and engages with two corner portions on the other side in the stacking direction of the stack. The first engaging portion and the second engaging portion are integrally connected to one tension member main body. The tension member is provided in the vicinity of the center of each long side of the tension member, the width D1 in the vicinity of the center of the tension member main body is smaller than the width D2 of the short side of the tension member, and the side surface of the cell stack. Has a notch-like opening to expose

  Here, the first engaging portion has a first end surface flange portion that can be engaged with the end surface in the stacking direction of the stack, and a first side surface flange portion that can be engaged with the side surface of the stack. The form is illustrated. In this case, the first end surface flange portion of the first engagement portion suppresses displacement in the stacking direction of the stack. Preferably, the first side surface flange portion of the first engagement portion is configured to suppress displacement in the planar direction of the stack cell or end plate (direction intersecting the stacking direction of the stack). In addition, when the 1st end surface collar part and the 1st side surface collar part are integrated, since the 1st side surface collar part reinforces the 1st end surface collar part, the displacement to the expansion direction of a 1st end surface collar part is carried out. Can be suppressed.

  The second engagement portion is exemplified by a form having a second end surface flange portion that can be engaged with the end surface in the stacking direction of the stack and a second side surface flange portion that can be engaged with the side surface of the stack. Is done. In this case, the second end surface flange portion of the second engaging portion suppresses displacement in the stacking direction of the stack. Preferably, the second side surface flange portion of the second engagement portion is configured to suppress displacement in the planar direction of the cell or end plate of the stack (direction intersecting the stacking direction of the stack). In addition, when the 2nd end surface collar part and the 2nd side surface collar part are integrated, since the 2nd side surface collar part reinforces the 2nd end surface collar part, the displacement to the expansion direction of a 2nd end surface collar part is carried out. Can be suppressed.

  According to the present invention, when the tension member is visually recognized along a direction parallel to the vertical direction with respect to the surface of the tension member main body, the first end surface flange and the first side surface flange forming the first engagement portion. And at least L-shaped, and the second end surface flange and the second side surface flange constituting the second engaging portion are at least L-shaped. The In this case, the displacement in the stacking direction of the stack is effectively suppressed.

  According to the present invention, the material of the tension member is not particularly limited, and examples thereof include metals and resins. Examples of the metal include carbon steel, alloy steel (including stainless steel), aluminum alloy, magnesium alloy, and titanium alloy, but are not limited thereto. As long as it is a resin, it may be a thermoplastic resin, a thermosetting resin, a reinforced resin by a reinforcing material such as a fiber, or an engineer plastic. Examples include polyamide (PA), polycarbonate (PC), polybutylene terephthalate (PBT), polyacetal (POM), polyphenylene ether (PPE), polyphenylene sulfide (PPS), and ABS resin. is not.

  At least one of the first engaging portion and the second engaging portion is exemplified by a form having a reinforced region in which the strength per unit area is reinforced as compared with the tension member main body. Examples of the reinforcing region include a hardening process such as a quenching process when the tension member is a metal, and a reinforcing process using a reinforcing material such as a fiber when the tension member is a resin.

  An example of the stack includes a stack including a plurality of cells stacked in the thickness direction, and end plates having corners disposed at both ends of the stack in the stacking direction. In this case, the end plate has a screw hole that opens to the side surface of the end plate and into which the mounting screw is screwed, and the tension member has a screw insertion opening at a position facing the screw hole of the end plate. The center line of the screw insertion opening is exemplified along the plane direction of the end plate.

  The end plate has a screw hole that is formed in the thickness direction of the end plate and opens to the end surface of the end plate and into which the mounting screw is screwed. The tension member is a position facing the screw hole of the end plate. Is provided with a screw insertion opening, and the center line of the screw insertion opening is along the thickness direction of the end plate.

  Examples of the tension member include a bulging portion that bulges toward the side surface of the stack and suppresses displacement in a direction crossing the stacking direction of the stack. In this case, the displacement of the stack in the direction crossing the stacking direction of the stack is suppressed.

  Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 shows a cross-sectional view viewed from the side of a stack 1 to which a tension member 2 is attached. FIG. 2 shows a cross-sectional view viewed from above the stack 1 from which the tension member 2 (shown in phantom) is removed. As shown in FIG. 1 and FIG. 2, the fuel cell stack device is formed in a substantially rectangular parallelepiped shape having a corner portion formed by laminating a plurality of solid polymer electrolyte type cells 10 whose planar shape is substantially rectangular. A stack 1 having a shape, a tension member 2 extending along the stacking direction (arrow X direction) of the stack 1, and an urging force in a direction in which the cells 10 of the stack 1 are brought into close contact with each other via the tension member 2 And a spring 8 as an urging member.

  Each cell 10 is stacked along the horizontal direction, that is, the arrow X direction. The stack 1 includes a stacked body 11 having a substantially rectangular parallelepiped shape in which a plurality of cells 10 are stacked in the thickness direction, and a substantially rectangular flat plate shape disposed at one end in the stacking direction (arrow X direction) of the stacked body 11. 1 end plate 12, and the 2nd end plate 13 which makes | forms the substantially rectangular flat plate shape arrange | positioned at the other end of the lamination direction (arrow X direction) of the laminated body 11. The first end plate 12 has a substantially rectangular flat plate shape, and has corner portions 12m at four corners. The second end plate 13 has a substantially rectangular shape, and has corner portions 13m at four corners. The material of the first end plate 12 and the second end plate 13 may be metal or hard resin.

  As shown in FIGS. 1 and 2, between the first end plate 12 and the laminated body 11, a terminal 14 that functions as an electrical energy extraction element and an insulator 15 having electrical insulation are disposed. Between the second end plate 13 and the laminate 11, a terminal 14 that functions as an electrical energy extraction element, an insulator 15 having electrical insulation, and a pressure plate 16 are disposed. A plurality of springs 8 serving as spring members are interposed between the pressure plate 16 and the second end plate 13. The spring 8 is a coil spring having a biasing force in the stacking direction (arrow X direction) of the stack 1. The pressure plate 16 is urged toward the first end plate 12 by the urging force of the spring 8, and the cells 10 of the laminate 11 are in close contact with each other.

  FIG. 3 shows a plan view of the tension member 2. FIG. 4 shows a perspective view of the tension member 2 viewed from below. As shown in FIGS. 3 and 4, the tension member 2 includes a plate-like tension member body 20 extending along the stacking direction (arrow X direction) of the stack 1 and one end side of the tension member body 20. A hook-shaped first engaging portion 3 provided integrally and a hook-shaped second engaging portion 4 integrally provided on the other end side of the tension member main body 20 are provided.

  As shown in FIG. 4, two first engaging portions 3 are formed on one side of the tension member 2 in the arrow X direction. Two second engaging portions 4 are formed on the other side of the tension member 2 in the arrow X direction. As shown in FIGS. 1 and 2, each first engagement portion 3 can be engaged with a corner portion 12 m of the first end plate 12 corresponding to the end portion of the stack 1. Each second engagement portion 4 is engageable with a corner portion 13 m of the second end plate 13 corresponding to the end portion of the stack 1. The first engagement portion 3 and the second engagement portion 4 are formed in a bowl shape in a bent state with respect to the tension member main body 20.

  As shown in FIGS. 3 and 4, the first engagement portion 3 has a first end surface flange portion 31 and a first side surface flange portion 32. The second engagement portion 4 includes a second end surface flange 41 and a second side surface flange 42. The first side flange 32 has a hypotenuse 32x. The second side flange 42 has a hypotenuse 42x. The oblique side portion 32x and the oblique side portion 42x are inclined so as to approach each other toward the tension member main body 20. In FIG. 4, an arrow H direction indicates a direction perpendicular to the surface of the tension member main body 20 of the tension member 2. When viewing one first engagement portion 3 along a direction parallel to the arrow H direction, the first end surface flange portion 31 and the first side surface flange portion 32 constituting the first engagement portion 3 are at least L. It has the shape of The first end surface flange portions 31 of the two first engaging portions 3 are integrally connected to each other and are disposed on the short side 2s side of the tension member 2. Accordingly, when the two first engaging portions 3 are visually recognized along the direction parallel to the arrow H direction, the first end surface flange portion 31 and the first side surface flange portion 32 that constitute the two first engagement portions 3, Has a U-shape.

  Further, as shown in FIG. 4, when one second engaging portion 4 is visually recognized along the direction parallel to the arrow H direction, the second end surface flange portion 41 and the second side surface constituting the second engaging portion 4 are used. The collar portion 42 is at least L-shaped. The second end surface flange portions 41 of the two second engaging portions 4 are integrally connected to each other and are disposed on the short side 2s side of the tension member 2. Therefore, when the two first engaging portions 3 are visually recognized along the direction parallel to the arrow H direction, the second end surface flange portion 41 and the second side surface flange portion 42 that constitute the two second engagement portions 4, Has a U-shape.

  As shown in FIG. 3, a notch-shaped opening 2 r is formed on each long side 2 p side of the tension member 2. Due to the opening 2r, the width D1 of the tension member main body 20 is made smaller than the width D2 of the short side 2s of the tension member 2. Since the opening 2r is formed, interference between the terminal 14 and the tension member 2 is easily avoided if the terminal 14 is exposed outward from the opening 2r.

  The material of the tension member 2 is not particularly limited, and may be metal or resin. Examples of the metal include carbon steel, alloy steel, aluminum alloy, and magnesium alloy. As long as it is a resin, it may be a thermoplastic resin, a thermosetting resin, a reinforced resin by a reinforcing material such as a fiber, or an engineer plastic. If the tension member 2 is a metal, it can be formed by press molding. If the tension member 2 is resin, it can be molded by injection molding.

  At the time of assembly, first, the stack 10 is formed by assembling the cells 10, the end plates 12, 13 and the like. Thereafter, the two tension members 2 are fitted and attached to the stack 1 from the side of the stack 1 (in the direction of the arrow S1 shown in FIG. 1). As a result, the tension member 2 is attached to the upper surface 1 u side and the lower surface 1 d side of the stack 1.

  FIG. 5 shows a structure for fixing the tension member 2 attached to the stack 1 to the stack 1. As shown in FIG. 5, screw holes 62 having female screw portions 62 a are respectively formed in the side surface 12 s of the first end plate 12 and the side surface 13 s of the second end plate 13 of the stack 1. A screw insertion port 23 is formed in the tension member main body 20 in a penetrating state so as to face the screw hole 62. The center line K1 of the screw insertion opening 23 is along the plane direction of the end faces 12e and 13e of the end plates 12 and 13.

  As shown in FIG. 5, an attachment screw 60 that functions as a fastening element is used. The attachment screw 60 is inserted into the screw insertion port 23 of the tension member 2 and then screwed into the screw hole 62 of the first end plate 12 and the screw hole 62 of the second end plate 13. Thereby, the first engaging portion 3 and the second engaging portion 4 of the tension member 2 are detachably held on the stack 1. As a result, the tension member 2 is detachably held on the upper surface 1 u side and the lower surface 1 d side of the stack 1. As shown in FIG. 4, for adjusting the position of the mounting screw 60, the screw insertion port 23 is a long hole, and has a long diameter in a direction (arrow Y direction) intersecting the stacking direction of the stack 1, The stack 1 has a minor axis in the stacking direction (arrow X direction).

  In the state where the two tension members 2 are fixed to the upper surface 1u side and the lower surface 1d side of the stack 1 as described above, as shown in FIGS. The first end surface flange 31 abuts on and engages with the end surface 12 e of the first end plate 12 of the stack 1. Further, the second end face flange 41 of the second engaging part 4 faces and engages with the end face 13 e of the second end plate 13 of the stack 1. As a result, the tension member 2 suppresses the displacement of the stack 1 in the arrow X direction while applying a pressure contact force to each cell 10.

  Here, the urging force of the spring 8 acts in the direction of arrow F, and is received by the first end surface flange 31 and the second end surface flange 41 of the tension member 2. For this reason, it is suppressed that the end plates 12 and 13 are excessively displaced in a direction away from each other. As a result, an excessive shearing force acting on the mounting screw 60 in the direction perpendicular to the axis thereof is suppressed. Therefore, the durability of the mounting screw 60 is improved.

  Further, as shown in FIG. 2, the first side surface flange portion 32 of the first engagement portion 3 of the tension member 2 faces the side surface 12 s of the first end plate 12 of the stack 1 via a gap ΔW1. The second side flange portion 42 of the second engagement portion 4 faces the side surface 13s of the second end plate 13 of the stack 1 via a gap ΔW2. At this time, when the gap widths of the gap ΔW1 and the gap ΔW2 are small, the first side surface flange portion 32 and the second side surface flange portion 42 of the tension member 2 are arranged in the planar direction of the end plates 12 and 13 of the stack 1 (arrow Y). Displacement in the direction, the direction intersecting the stacking direction of the stack 1) can be suppressed. However, the gaps ΔW1 and ΔW2 described above may exist to some extent. The tension member 2 touches the end plates 12 and 13 insulated by the insulator 15 of the stack 1 but is not in contact with the cell 10.

  As described above, according to the present embodiment, when one tension member 2 is mounted on the stack 1, the stacking direction (arrows) of the stack 1 is determined by the two first engaging portions 3 formed on the tension member 2. The two corner portions 12m of the first end plate 12 on one side in the (X direction) can be respectively held. Further, the two corner portions 13m of the second end plate 12 on the other side in the stacking direction (arrow X direction) of the stack 1 are held by the two second engaging portions 4 formed on the tension member 2. Can do. Since the four corner portions 12m and 13m of the stack 1 can be held by the single tension member 2 as described above, the number of parts can be reduced as compared with the conventional techniques shown in Patent Documents 1 and 2 described above.

  In other words, according to the present embodiment, as shown in FIGS. 3 and 4, the two first engaging portions 3 of one tension member 2 are integrally connected and physically separated. Absent. Further, the two second engaging portions 4 of one tension member 2 are integrally connected and are not physically separated. For this reason, the number of parts is reduced as compared with the prior arts shown in Patent Documents 1 and 2, which are physically separated into four.

  According to the present embodiment, as shown in FIGS. 3 and 4, the first end face flange 31 and the first side face flange 32 are integrally joined in the first engagement portion 3 of the tension member 2. Therefore, the first end face collar 31 is reinforced by the first side collar 32. As a result, the first side surface flange portion 32 can suppress the displacement of the first end surface flange portion 31 in the expanding direction (the arrow X1 direction shown in FIG. 1). Further, in the second engagement portion 4 of the tension member 2, the second end surface flange 41 and the second side surface flange 42 are integrally joined, so the second end surface flange 41 is the second side surface flange 42. It is reinforced by. As a result, the second side surface flange 42 can suppress the displacement of the second end surface flange 41 in the expanding direction (arrow X2 direction). This is advantageous in providing an appropriate pressure contact force between the cells 10 of the stack 1.

  Furthermore, according to the present embodiment, the pressure contact force applied to the cell 10 of the stack 1 is determined by the distance between the first end surface flange 31 and the second end surface flange 41. For this reason, it is suppressed that the press-contact force given to the cell 10 by an operator fluctuates.

  6 and 7 show a second embodiment. As shown in FIGS. 6 and 7, a screw insertion opening 23 </ b> B is formed in the first side face flange portion 32 and the second side face flange portion 42 of the tension member main body 20. As shown in FIG. 7, the center line K <b> 2 of the screw insertion opening 23 </ b> B is along the planar direction of the first end plate 12 and the second end plate 13. As shown in FIG. 7, the mounting screw 60 inserted into the screw insertion slot 23 </ b> B is screwed into the screw holes 62 </ b> B of the first end plate 12 and the second end plate 13. Accordingly, the first engaging portion 3 and the second engaging portion 4 of the tension member 2 are detachably held on the stack 1. As a result, the tension member 2 is detachably held on the stack 1. In order to adjust the position of the mounting screw 60, the screw insertion port 23B is a long hole, and has a long diameter in the stacking direction (arrow X direction) of the stack 1 and a short diameter in a direction intersecting this.

  8 and 9 show a third embodiment. According to the present embodiment, the first end plate 12 and the second end plate 13 are formed using a hard resin as a base material. As shown in FIG. 9, a metal (for example, steel) insert part 62 </ b> K is embedded in the first end plate 12 and the second end plate 13. The insert component 62K has a screw hole 62C that opens in the thickness direction of the first end plate 12 and the second end plate 13. In the tension member 2, a screw insertion port 23 </ b> C is formed in the first end surface flange portion 31 of the first engagement portion 3 and the second end surface flange portion 41 of the second engagement portion 4 so as to face the screw hole 62 </ b> C. ing. The center line K3 of the screw insertion opening 23C is along the thickness direction of the first end plate 12 and the second end plate 13. As shown in FIG. 9, the attachment screw 60 inserted into the screw insertion port 23 </ b> C is screwed into the screw hole 62 </ b> C of the first end plate 12 and the screw hole 62 </ b> C of the second end plate 13. As a result, the first engaging portion 3 and the second engaging portion 4 of the tension member 2 are detachably held on the stack 1. In order to adjust the position of the mounting screw 60, the screw insertion slot 23C is a long hole. The screw insertion opening 23 </ b> C has a long diameter in a direction (arrow Y direction) intersecting the stacking direction of the stack 1.

  According to the present embodiment, the thickness t1 of the first end plate 12 and the thickness t2 of the second end plate 13 can be set without being affected by the diameter size D6 of the insert part 62K. Therefore, the diameter size D6 of the insert part 62K can be set larger than the thicknesses t1 and t2 in order to strengthen the fastening force between the mounting screw 60 and the screw hole 62C. Therefore, it is advantageous when the first end plate 12 and the second end plate 13 are formed using a resin as a base material.

  FIG. 10 shows a fourth embodiment. The tension member 2 is formed of a steel system. In the tension member 2, the first end surface flange 31 of the first engagement portion 3 and the second end surface flange 41 of the second engagement portion 4 are attached to the spring 8. In order to receive the force, it is preferable that the deformation resistance is high. Therefore, the first end face flange 31 of the first engagement portion 3 and the second end face flange 41 of the second engagement portion 4 are subjected to a strengthening process, that is, a quenching process (part marked with x), per unit area. The strength is strengthened so as to be stronger than that of the tension member main body 20. The quenching process is performed by heating to a quenching temperature or higher by induction heating or the like and then rapidly cooling with water. As a result, it is possible to suppress the displacement of the first end face flange 31 in the expanding direction (arrow X1 direction). Displacement of the second end face flange 41 in the expanding direction (arrow X2 direction) can be suppressed. The strengthening process is not limited to the quenching process, but may be a process that diffuses and infiltrates the alloy element.

  FIG. 11 shows a fifth embodiment. The opening area of the notch-shaped opening formed on the long side 2p side of the tension member 2 is increased. Therefore, when the width dimension of the short side 2s of the tension member 2 is D2, and the width dimension of the tension member body 20 is D1, D1 / D2 = 0.2 to 0.8, or 0.4 to 0.7. can do. Thereby, the opening width D3 of the opening 2r is ensured. Therefore, even when the shape of the terminal 14 changes, interference between the terminal 14 and the tension member 2 is easily avoided. It is easy to reduce the weight.

  FIG. 12 shows a sixth embodiment. Since the first engaging portion 3 and the second engaging portion 4 of the tension member 2 receive the pressure contact force of each cell 10 of the stack 1, it is preferable that the deformation resistance is high. Therefore, in the tension member 2, the reinforcing portion 52 is strengthened by being coupled to the first end surface flange portion 31 and the first side surface flange portion 32 of the first engagement portion 3 by a coupling means such as welding or screwing. . A reinforcing portion 52 is reinforced by being coupled to the second end surface flange portion 41 and the second side surface flange portion 42 of the second engagement portion 4 by a connecting means such as welding or screwing. As a result, it is possible to suppress the displacement of the first end face flange 31 in the expanding direction (arrow X1 direction). Displacement of the second end face flange 41 in the expanding direction (arrow X2 direction) can be suppressed. The reinforcement part 52 should just have an L shape at least.

  FIG. 13 shows a seventh embodiment. The tension member main body 20 of the tension member 2 includes a bulging portion 28. The bulging portion 28 is located in an intermediate region in the length direction of the tension member 2, that is, in the stacking direction (arrow X direction) of the stack 1. The bulging portion 28 bulges toward the upper surface 1 u and lower surface 1 d (side surface) of the stack 1. As a result, displacement in the direction (arrow YA direction) orthogonal to the stacking direction of the stack 1 is further suppressed by the bulging portion 28. In particular, it is advantageous when the number of stacked cells 10 increases and the length of stack 1 in the stacking direction (arrow X direction) increases. For example, if the tension member 2 is made of metal, the bulging portion 28 can be formed by press molding. If the tension member 2 is made of resin, the bulging portion 28 can be formed by injection molding. When the tension member 2 has conductivity such as metal, at least the surface of the bulging portion 28 facing the stack 1 is insulated.

Reference example 1

14 and 15 show Reference Example 1. FIG. In the tension member 2, the first end surface flange 31 of the first engagement portion 3 and the first end surface flange 31 of the second engagement portion 4 receive the biasing force of the spring 8, and therefore have high deformation resistance. Is preferred. Therefore, the first side flange 32 of the first engagement portion 3 and the second side flange 42 of the second engagement portion 4 are continuously extended in the direction of the arrow X, and are integrally connected and strengthened. Has been. As a result, it is possible to suppress the displacement of the first end face flange 31 in the expanding direction (arrow X1 direction). Displacement of the second end face flange 41 in the expanding direction (arrow X2 direction) can be suppressed.

  Further, as shown in FIG. 15, the first side surface flange 32 and the second side surface flange 42 extending in the direction of the arrow X are the side surfaces 12 s and 13 s of the end plates 12 and 13 of the stack 1 and the side surface of the cell 10. It can be engaged facing 10s. For this reason, the displacement displacement in the plane direction of each cell 10 (that is, the arrow Y direction that intersects the arrow X direction that is the stacking direction) is suppressed.

Reference example 2

FIG. 16 shows Reference Example 2 . Also in the reference example 2 , as shown in FIG. 16, the first side surface flange portion 32 and the second side surface flange portion 42 of the tension member 2 are the side surfaces 12 s and 13 s of the end plates 12 and 13 of the stack 1, and the side surface of the cell 10. It can be engaged facing 10s. For this reason, the displacement displacement in the plane direction of each cell 10 (that is, the arrow Y direction that intersects the arrow X direction that is the stacking direction) is suppressed. Furthermore, the first side surface flange 32 and the second side surface flange 42 have an opening 14 t for exposing the terminal 14.

(Other examples)
According to the first embodiment, the two tension members 2 are provided on the upper surface 1 u side and the lower surface 1 d of the stack 1.
However, the present invention is not limited to this, and the two tension members 2 may be attached only to the upper surface 1u side of the stack 1 or only to the lower surface 1d side. Furthermore, the tension member 2 is only on the right side of the stack 1 or only on the left side, or
It may be attached to both the right side and the left side of the stack 1. When the material of the tension member 2 is a metal, an insulation process such as laminating an insulating film or the like can be applied to the tension member 2 as necessary. The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope not departing from the gist.

  The present invention can be used for fuel cell systems for vehicles, stationary devices, electric devices, electronic devices, and the like.

FIG. 3 is a cross-sectional view of the stack on which the tension member is attached as viewed from the side according to the first embodiment. FIG. 4 is a cross-sectional view of the stack as viewed from above according to the first embodiment. FIG. 6 is a plan view of a tension member according to the first embodiment. FIG. 3 is a perspective view of the tension member as viewed from below according to the first embodiment. FIG. 6 is a cross-sectional view illustrating a state in which the tension member is fixed to the end plate of the stack according to the first embodiment. FIG. 6 is a perspective view of a tension member viewed from below according to the second embodiment. FIG. 10 is a cross-sectional view illustrating a state in which a tension member is fixed to an end plate of a stack according to the second embodiment. FIG. 9 is a perspective view of a tension member viewed from below according to the third embodiment. FIG. 10 is a cross-sectional view illustrating a state in which a tension member is fixed to an end plate of a stack according to the third embodiment. FIG. 9 is a perspective view of a tension member viewed from below according to the fourth embodiment. FIG. 10 is a plan view of a tension member according to the fifth embodiment. FIG. 10 is a perspective view of a tension member viewed from below according to the sixth embodiment. FIG. 10 is a cross-sectional view of a stack on which a tension member is attached as viewed from the side according to Example 7. FIG. 6 is a perspective view of a tension member viewed from below according to Reference Example 1 ; It is sectional drawing which concerns on the reference example 1 and visually recognized the stack | stuck from upper direction. It is sectional drawing which concerns on the reference example 2 and visually recognized the stack | stuck from upper direction. FIG. 6 is a perspective view of a stack on which a tension member is attached as viewed from above according to the related art. FIG. 6 is a front view of a stack to which a tension member is attached according to another conventional technique.

  1 is a stack, 10 is a cell, 11 is a laminate, 12 is a first end plate, 13 is a second end plate, 12e is an end surface of the first end plate, 13e is an end surface of the second end plate, and 12s is a first end. Side surface of plate, 13s is side surface of second end plate, 22 is tension member, 20 is tension member main body, 28 is bulging portion, 3 is first engaging portion, 31 is first end surface flange portion, 32 is first portion The side hooks, 4 are second engaging parts, 41 is a second end face hook, 42 is a second side hook, 60 is a mounting screw, and 8 is a spring (biasing means).

Claims (9)

A laminate formed by laminating a plurality of cells whose planar shape is a substantially rectangular shape in the thickness direction, and a stack having end plates disposed at both ends of the laminate in the laminating direction and having corners;
A pressure plate disposed between one of said end plates and said laminate,
A tension member extending in the stacking direction of the stack;
Provided between one of said end plates and said pressure plate, which comprises a spring member having a spring force which biases in a direction to close the respective cells each other of said stacks through said tension member,
The tension member is
A plate-like tension member main body extending in the stacking direction of the stack;
A first engagement portion that is provided on the tension member main body and engages with two corner portions on one end side in the stacking direction of the stack;
A second engaging portion that is provided on the tension member main body and engages with two corners on the other end side in the stacking direction of the stack ,
The first engagement portion and the second engagement portion are integrally connected to one tension member body,
Provided in the vicinity of the center of each long side of the tension member, the width D1 in the vicinity of the center of the tension member main body is smaller than the width D2 of the short side of the tension member, and the side surface of the cell stack is A fuel cell stack device having a notch-like opening that is exposed .   2. The first engagement portion according to claim 1, wherein the first engagement portion includes a first end surface flange portion that can be engaged with an end surface in the stacking direction of the stack and a first side surface flange portion that faces a side surface of the stack. A fuel cell stack device.   3. The second engagement portion according to claim 1, wherein the second engagement portion includes a second end surface flange portion that can be engaged with an end surface in the stacking direction of the stack, and a second side surface flange portion that faces the side surface of the stack. A fuel cell stack device comprising:   4. The fuel cell stack device according to claim 3, wherein the first side surface flange portion and the second side surface flange portion suppress displacement displacement in a planar direction of the stack. 5. In Claim 3 or 4, when visually recognized along a direction parallel to the vertical direction of the surface of the tension member body of the tension member,
The first end surface flange portion and the first side surface flange portion constituting the first engagement portion are at least L-shaped, and the second end surface constituting the second engagement portion. The fuel cell stack device, wherein the flange and the second side flange are at least L-shaped.   6. The reinforcement according to claim 1, wherein at least one of the first engagement portion and the second engagement portion has a strength per unit area stronger than that of the tension member body. A fuel cell stack device having a region. The end plate according to any one of claims 1 to 6, wherein the end plate has a screw hole that opens to a side surface of the end plate and into which a mounting screw is screwed.
The tension member includes a screw insertion port at a position facing the screw hole of the end plate, and a center line of the screw insertion port is along a planar direction of the end plate. Stack device. 7. The end plate according to claim 1, wherein the end plate has a screw hole that is formed in a thickness direction of the end plate and opens to an end surface of the end plate and into which a mounting screw is screwed. And
The tension member includes a screw insertion port at a position facing the screw hole of the end plate, and a center line of the screw insertion port is along a thickness direction of the end plate. Stack device.   9. The tension member according to claim 1, wherein the tension member bulges toward a side surface of the stack, and includes a bulging portion that suppresses displacement in a direction crossing the stacking direction of the stack. A fuel cell stack device.

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