JP2014209418A - Fastening method of stack and fastening jig of stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a step for inserting a stack into a case or fastening the stack, conveniently in a case of a stack structure where an end case including a stack fastening member is used as the end face wall of the case.SOLUTION: After lamination of a cell, a load is applied by a shaft 6 along the lamination direction of the cell from the reverse side of an end plate 8 in the lamination direction of the cell. While holding the laminated state of the cell, the shaft 6 is passed through the through hole 5 of a case 4, which also serves for ventilation in the case and through which the shaft 6 can pass. Subsequently, the case 4 is slid along the shaft 6 thus fastening the case 4 and the end plate 8.

Description

  The present invention relates to a stack fastening method and a stack fastening jig.

  The fuel cell stack is composed of a power generation unit and a non-power generation unit, and these components are assembled into a unit by fastening the stack. Conventionally, such a stack structure has been used in which a stack is fastened between an end plate and the fastened stack is inserted into a case.

  On the other hand, as such a fuel cell stack, a stack structure is also proposed in which an end plate corresponding portion arranged on one side in the stacking direction of the stack is used as an end face wall of the rigid case. According to such a stack structure, since the case can be used as a part of the stack fastening member, there is an advantage that the number of parts can be reduced and the space can be saved (for example, see Patent Document 1).

JP 2011-253730 A

  However, in the stack structure using the end plate including the stack fastening member as the end face wall of the case as described above, it may be difficult to easily perform the steps of inserting the stack into the case and fastening the stack.

  Therefore, the present invention provides a stack structure that can easily perform steps such as insertion of the stack into the case and fastening of the stack in the case of a stack structure using an end plate having a stack fastening member as the end face wall of the case. It is an object to provide a fastening method and a jig for fastening a stack.

  In order to solve this problem, the present inventor has made various studies. One feature of the stack structure in which an end plate having a stack fastening member is used as an end wall of the case is that the case has a fastening function. However, such a structure may have the following problems or causes. That is, (1) some end plates have stepped irregular shapes on the laminate side surface and the case side surface, and the stepped laminate seal surface has the same position as the cell reference. Some have standards. When such an end plate is used, it is necessary to stack the laminated body from the reference side through the end plate, and to insert the laminated body (stack) into the case in a state where the laminated body (stack) is pressurized by the pressure shaft. This is because a single beam is passed through the end of the RH of the case (see the first paragraph of the embodiment of the present invention) to form an interface that seals the end plate and the case. This is due to the fact that it cannot be put in the case. (2) Since the cell is longer than the inside size of the case in a no-load state (a state where pressure is not applied in the stacking direction), it is necessary to insert the stack into the case while maintaining the pressurized state. The inventors of the present invention who have further studied from the viewpoint of simply performing the above-described steps paying attention to these points have come to obtain new knowledge that leads to the solution of such problems.

The present invention is based on such knowledge, in a method for fastening a stack having an end plate on one side and stacking cells with the end plate at the end,
After cell stacking, load is applied along the stacking direction with the shaft from the opposite side of the end plate in the cell stacking direction,
Keep the cells stacked,
Pass the shaft through the through hole of the case with a through hole through which the shaft can pass and also for ventilation in the case,
Slide the case along the shaft,
It is characterized by fastening a case and an end plate.

  Some cases for stack structures in which cells are stacked have ventilation holes formed therein. The present inventor, who has repeatedly studied from the above viewpoint, has focused on this through hole, and has come to obtain the knowledge that it is also used as a hole for a shaft for pressurization. According to the present invention based on such knowledge, steps such as insertion of the stack into the case and fastening of the stack can be easily performed. In addition, this adds a new function by allowing the shaft to be inserted into the through-hole (the ventilation hole of the case), so there is also an advantage that the existing structure is used or is easy to use. is there.

  In the present invention, in the stack fastening method, a shaft longer than the length of the stacked cells in the stacking direction is used as the shaft.

  Furthermore, the stack fastening jig according to the present invention is a jig including a shaft used in the stack fastening method described above, and the shaft is longer than the stacking direction length of the stacked cells. It is characterized by this. According to this, since it is possible to visually check the stacking state of all the stacks with the case being passed through the shaft, the visual recognition performance at the time of assembly and manufacturing is improved.

  According to the present invention, in the case of a stack structure in which an end plate having a stack fastening member is used as an end surface wall of a case, it is possible to easily perform steps such as insertion of the stack into the case and fastening of the stack.

It is a perspective view of a stack, a case, etc. showing one embodiment of the present invention. It is a perspective view which shows the state which inserted the stack shown in FIG. 1 in the case. It is a perspective view which shows an example of a case. It is a figure showing the cross section in the AA of FIG. 3 which shows structural examples, such as a stack and a case. It is a figure which shows the stack of the state which is not pressurized. It is a figure which shows the stack | stuck of the pressurized state. It is the first figure in a series of drawings showing a fastening method of a stack, and shows a lamination process. It is a figure which shows the process from the jig | tool assembly in the stack | stuck fastening method to throwing in in an apparatus. It is a figure which shows the pressurization process in the fastening method of a stack. It is a figure which shows the process of the pre-creep, the fastening load provision, and the lamination | stacking shift | offset | difference inspection in the fastening method of a stack. It is a figure which shows the process of the casing in the fastening method of a stack. It is a figure which shows the process of the stack fastening in the stack fastening method. It is a figure which shows an example of the position regulation of the edge | side of a cell. It is a perspective view which shows an example of a cell pallet (lamination jig). It is a figure which shows the cross section of the cell palette in the XV-XV line | wire of FIG. It is a figure which shows the support structure of the end plate supported by the backup plate. It is a perspective view which shows an example of a case. It is a figure which shows the case seen from the surface in which the through-hole was provided. It is a perspective view which shows the ventilation cover which can be attached or detached to a case and the through-hole of this case. It is a figure which shows an example of the conventional stack fastening method as a reference example. It is a figure which shows the next process of FIG. FIG. 22 is a diagram showing a step subsequent to FIG. 21. FIG. 23 is a diagram showing a step subsequent to that in FIG. 22. FIG. 24 is a diagram showing a step subsequent to FIG. 23. FIG. 25 is a diagram showing a step subsequent to FIG. 24. FIG. 26 is a diagram showing a step subsequent to that in FIG. 25. FIG. 27 is a diagram showing a step subsequent to that in FIG. 26. FIG. 28 is a diagram showing a step subsequent to FIG. 27. It is a figure which shows an example of the conventional stack as a comparative example. It is a perspective view which shows the state which inserted the stack shown in FIG. 29 in the case as a comparative example. It is the first figure in a series of drawings showing a conventional example of fastening of a stack as a comparative example, and shows a lamination process. It is a figure which shows the drawing-in process in the prior art example of the fastening of a stack as a comparative example. It is a figure which shows the process of the laminated body movement in the prior art example of the fastening of a stack as a comparative example. It is a figure which shows the process of the end plate fastening in the prior art example of the fastening of a stack. It is a figure which shows the pre-creep process in the prior art example of the fastening of a stack as a comparative example. It is a figure which shows the process of stack fastening in the prior art example of stack fastening as a comparative example. It is a perspective view which shows an example of the assembly | attachment reference | standard at the time of cell positioning. It is a figure which shows the other example of the assembly | attachment reference | standard at the time of cell positioning. It is a figure which shows one of the subjects in the fastening structure of the conventional stack as a comparative example. It is a figure which shows one of the subjects in the fastening structure of the conventional stack as a comparative example. It is a figure which shows one of the subjects in the fastening structure of the conventional stack as a comparative example. It is a figure which shows one of the subjects in the fastening structure of the conventional stack as a comparative example. It is a figure which shows one of the subjects in the fastening structure of the conventional stack as a comparative example. It is a perspective view which shows an example of the conventional stack structure as a comparative example. It is a perspective view which shows an example of the conventional stack structure as a comparative example. It is a perspective view which shows an example of the conventional case. It is a figure which shows an example of the conventional case seen from the surface in which the through-hole was provided.

  1 to 19 show an embodiment of the present invention. In the embodiment described below, an outline of a cell (power generation module) 2 and a stack (cell stack) 3 constituting the fuel cell 1 will be described while showing a stack in the fuel cell, and then a stack fastening method Now, a jig for fastening the stack will be described. In this specification, in order to represent the direction and direction in the stack 3 for convenience, “RH” (right of the cell stacking direction), “LH” (left of the cell stacking direction), “LWR” (cell stacking direction) ) And “UPR” (upper right in the cell stacking direction).

  The cell 2 constituting the fuel cell 1 functions as a power generation module, and forms a cell stack 3 (also referred to as a stack in this specification) by being sequentially stacked. The stack 3 formed in this manner has an end plate 8 disposed on the side in the stacking direction, and is fastened by applying a load in the stacking direction between the end face wall of the case 4 and the end plate 8. It is like that.

  The fuel cell 1 configured by the stack 3 in which the cells 2 are stacked as described above can be used as, for example, an in-vehicle power generation system of a fuel cell vehicle (FCHV; Fuel Cell Hybrid Vehicle), but is not limited thereto. Rather, it can be used as a power generation system that is mounted on various mobile objects (for example, ships, airplanes, etc.), robots, and the like that can run on their own. In some cases, it can be used as a stationary fuel cell 1.

  Although not particularly shown, the electrolyte contained in the cell 2 includes a membrane-electrode assembly (MEA) or a membrane-electrode-diffusion layer assembly (MEGA). ) Can be used. The cell 2 includes such a MEGA (membrane-electrode-diffusion layer assembly) and a pair of separators that sandwich the MEGA. Further, the MEGA and each separator are molded by a molding resin together with a sealing member at a peripheral portion between them.

  MEGA is composed of a polymer electrolyte membrane (hereinafter also simply referred to as an electrolyte membrane) made of an ion exchange membrane of a polymer material, and a pair of electrodes (an anode catalyst layer and a cathode catalyst layer) sandwiching the electrolyte membrane from both sides. ing. Among these, the electrolyte membrane is formed to be slightly larger than each electrode. The electrode constituting the MEGA is made of, for example, a porous carbon material (diffusion layer) carrying a catalyst such as platinum attached to the surface thereof. One electrode (anode catalyst layer) is supplied with hydrogen gas as a fuel gas (reaction gas), and the other electrode (cathode catalyst layer) is supplied with an oxidizing gas (reaction gas) such as air or an oxidant. The reaction gas causes an electrochemical reaction in the MEGA so that the electromotive force of the cell 2 can be obtained.

  The separator is made of a gas impermeable conductive material. Examples of the conductive material include carbon and a hard resin having conductivity, and metals such as aluminum and stainless steel. The substrate of the separator of this embodiment is formed of a plate-like metal (metal separator), and a film having excellent corrosion resistance (for example, a film formed of gold plating) is formed on the electrode side surface of the substrate. Is formed.

  The separator functions as a flow path forming member, and groove-shaped flow paths constituted by a plurality of recesses are formed on both surfaces of the separator. These flow paths can be formed by press molding in the case of the separator of the present embodiment in which the substrate is formed of, for example, a plate-like metal. The groove-shaped flow path formed in this way constitutes a gas flow path for oxidizing gas, a gas flow path for hydrogen gas, or a cooling water flow path.

  Case 4 functions as a casing of fuel cell 1. The case 4 of the present embodiment is formed with a through hole 5 that allows ventilation between the outside and the inside of the case 4 (see FIG. 3 and the like).

  Next, a method for fastening the stack 3 and a jig for fastening the stack 3 will be described (see FIG. 1 and the like). An example of a conventional stack fastening method will be described later as a comparative example, so please refer to that as well.

  As described above, in the fuel cell 1 of the present embodiment, the stack case (also simply referred to as “case” in the present specification) 4 has the function of the fastening member, the LH side of the end plate 8, thereby stacking. The stack 3 is inserted into the case 4 at the same time as (or in parallel with) 3 (see FIGS. 1 to 3 and the like). In other words, in the present embodiment, a portion corresponding to the end plate 8 disposed on one side in the stacking direction of the stack 3 is used as an end surface wall of the case 4, thereby forming an end plate on the end surface wall of the case 4. It has a structure with added functions. In addition, the code | symbol 18 in a figure represents a tension shaft (refer FIG. 2 etc.).

  However, when the function is added in this way, (1) the stacked body is stacked over the end plate 8, and the stack (cell stacked body) 3 is pressurized with the pressurizing shaft 6 and inserted into the case 4. (2) Since the cell 2 is longer than the inner dimension of the case 4 in a no-load state (not pressurized in the stacking direction) (see FIG. 5), it is stacked while maintaining the pressurized state. 3 is required to be inserted into the case 4 (see FIG. 6). Incidentally, the problem of the above (1) is that the case beam 7 is passed through the end of the RH of the case 4 in order to form an interface for sealing between the end plate 8 and the case 4 (see FIGS. 3 and 4). This is because the cell 2 cannot be put in the case 4 later.

  In view of these points, in this embodiment, the stack is easily put into the case 4 by using the ventilation through hole 5 formed in the case 4 and using the shaft 6 that can pass through the through hole 5. The structure can be inserted. More specifically, the ventilation hole 5 for ventilation is also used as a hole into which the shaft 6 can be inserted. When the stack 3 is inserted into the case 4, the shaft 6 is inserted and the stack 3 is inserted while being pressurized. To be able to.

  Hereinafter, the fastening method of the stack 3 in this embodiment and the jig | tool used for this fastening method are demonstrated (refer FIG. 7 etc.).

  In the present embodiment, the pressurizing shaft 6 and the cell pallet 10 used when the cells 2 are stacked are used as a stack fastening jig. When the cells 2 are stacked, the cell pallet 10 functions as a guide that regulates (positions outside) the position of one side of each cell 2 and eliminates displacement and undulation during pressurization (FIG. 7). Etc.). Although there are various ways of regulating the position of one side, in this embodiment, two stacking reference portions 26 are provided on the long side of the cell 2 and one on the short side (see FIG. 13). Applying to the surface of the cell pallet 10 (see FIGS. 14 and 15), the positions of multiple points and sides of each cell 2 are regulated.

(1) Stacking The cells 2 are stacked on the cell pallet 10 in order from the end plate (stack manifold) 8 side to form a stack 3. At this time, the external setup of the cell 2 is performed (see FIG. 7). An end of the stack 3 opposite to the end plate 8 is restrained by, for example, a ratchet-type holding member 12 (see FIG. 8).

  Although not shown in detail in FIG. 7 and the like, the end plate 8 is supported by the backup plate 34. This support structure will be described with reference to FIG. 16. The backup plate 28 is configured to support the end plate 8 while being attached to the base plate 32 of the fastening device body 30 (see FIG. 16). ). Reference numeral 36 denotes a jig shaft for aiming and restraining only a specific part (suppressing part) of the end plate 8 so as not to interfere with the auxiliary machine 20. Even if the auxiliary machine 20 is first assembled to the end plate 8, the end plate 8 is supported by the backup plate 34, so that it can be pre-attached.

(2) Assembly of end plate pressurizing jig to input into apparatus The case 4 is input into an apparatus (an assembly apparatus including the cell pallet 10) (see FIG. 8). At this time, the case 4 is set so as to penetrate through the shaft 6 for product relative pressurization. In this step, the stack 3 is displaced outside the apparatus, and a load (for example, 1 to 5 kN) is applied so as not to cause undulation.

(3) Pressurization The movement of the cell 2 (for example, displacement or undulation during pressurization) is constrained to the sub-reference side (the side opposite to the main reference side where the cell pallet 10 is arranged outside each cell 2). For this purpose, a restraining guide 14 is installed (see FIG. 9). For example, the constraint guide 14 is set as a deviation standard value with respect to the external nominal value of the cell 2. Note that “lamination misalignment” refers to the relative misalignment amount of each cell 2 on the stacking reference portion 26 side described above. On the sub-reference side, since the tolerance of the outer shape of the separator that is a component of the cell 2 is added, it is not known whether it is a stacking shift or the influence of the outer dimensions. However, the guide for restraining (constraint guide) can be provided only on the sub-reference side where the stacking reference portion 26 is not provided. When constraining cell stacking deviation on the sub-reference side, if the cell stacking deviation standard value is set with respect to the nominal value of the cell outer shape, if the cell outer shape tolerance minimum product comes, only the deviation standard value + the minimum tolerance Since the space is vacant, there is a possibility that the stacking deviation of the stacking reference portion 26 is not within the standard value. For this reason, the position of the constraint guide is set as a deviation standard value with respect to the cell outer shape minimum value.

(4) Pre-creeping, fastening load application, stacking displacement inspection Pre-creeping (removal of damper component of stack 3 → load reduction prevention due to delay of damper during operation) is performed, and fastening load is applied (see FIG. 10). Moreover, the completion state before fastening is measured by the stacking displacement inspection apparatus 16 using a laser displacement meter, for example. Conventionally, it is impossible to inspect the cell stacking deviation and swell in the stacked to pressurized state, but in the present embodiment, it is possible to inspect these cell stacking deviation and swell. Before the stack 3 is inserted into the case 4, the pressurizing process for the stack 3 is completed.

(5) Insert the case 4 into the casing stack 3. In this embodiment, the case 4 is carried out by relative movement to the stack 3 side (see FIG. 11). At this time, the fastening load applied to the stack 3 using the shaft 6 is maintained. Further, at this step, the cell pallet 10 as the main reference and the restraining guide 14 as the sub reference are each released from the stack 3.

(6) Stack fastening The stack 3 is fastened (see FIG. 12). The end plate 8 is in a state of being fastened to the case 4 by the tension shaft 18 or the like. A load adjusting screw 22 is disposed between the stack 3 and the case 4.

  Although the above is an example of the fastening method of the stack | stuck 3, when implementing such a fastening method, it can also be set as a more suitable stack structure. Hereinafter, such a structure will be described by way of example (see FIG. 17 and the like). In the structure illustrated here, the diameter of the through-hole 5 for penetrating the shaft 6 is enlarged, and the number of the through-holes 5 is further increased (see FIGS. 17 and 18).

  In other words, the embodiment of the stack 3 fastening method and the fastening jig 10 according to the present invention is as described above. However, as explained, the stack 3 is moved from the load-free state to the maximum while passing the shaft 6 through the case 4. If the stroke is changed up to the load, a very long shaft 6 corresponding to the stroke is required. Under such circumstances, increasing the diameter of the through-hole 5 as exemplified here makes it possible to employ a shaft 6 having a larger diameter. It is possible to minimize buckling and bending of the 6 itself.

  For example, when pressurizing the stack 3 with two shafts 6, for example, an external force acting in a predetermined direction (for example, an external force acting in the vertical direction if the two shafts 6 are arranged in a lateral direction). However, it is difficult to sufficiently resist the shaft 6 (see FIGS. 46 and 47). As in the present embodiment, by increasing the number of through holes 5, buckling and bending of the shaft 6 can be suppressed. (See FIGS. 17 and 18). Needless to say, these through holes 5 are arranged so as not to be linear. From the viewpoint of sharing the load, it is preferable that the number of the through holes 5 is large. In addition, you may make it block the above-mentioned through-hole 5 timely with the ventilation cover 24 which can be attached or detached to the through-hole 5 (refer FIG. 19).

  As long as the above-described through hole 5 is a ventilation hole and allows the stack 3 to be inserted into the case 4 while pressing the stack 3, the arrangement on the case 4 is as follows. There is no particular limitation, and for example, the through holes 5 may be arranged on the side surface of the case 4 (see FIG. 19). In addition, when the through-hole 5 is arranged on the side surface of the case 4 in this way, compared to the structure in which the ventilation hole is arranged on the upper surface, the through-hole 5 and the water surface when the stack 3 falls into the water. Although the distance is short, there is an advantage that water immersed in the case 4 is easily drained.

  As described so far, according to the fastening method of the stack 3 and the fastening jig 10 of the present embodiment, when the end plate 8 including the stack fastening member is used as the end face wall of the case 4, It is possible to easily perform processes such as insertion of the stack 3 into the case 4 and fastening of the stack 3.

  Speaking of conventional through-holes, the diameter (area) of the through-holes is small, and the function of performing ventilation from within the stack case could not be achieved. It was only a hole that could be used to retract. For this reason, in the conventional structure, another hole for ventilation was created on the upper surface of the case for ventilation, and the conventional ventilation hole was merely a through hole in this respect. On the other hand, in this embodiment, the stack is simply inserted into the case 4 by using the ventilation hole 5 formed in the case 4 and using the shaft 6 that can pass through the hole 5. Since it has a structure that can do this, it is possible to add a new function to the through-hole 5 that was conventionally only closed.

  Moreover, since it is a structure using the end plate 8 provided with a stack fastening member as an end surface wall of the case 4, the case 4 can be used as a part of the stack fastening member as in the conventional structure, and the number of parts can be reduced. Needless to say, there is an advantage that space saving is possible.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, the shaft 6 is described as a member constituting the stack fastening jig, but this is only a preferable example. In short, after the cells 2 are stacked, the shaft is only given as a representative example of the load applied to the stack 3 along the stacking direction from the opposite side of the end plate 8, and passes through the through holes 5. The shaft 6 is not limited to the above-described shaft 6 as long as a load can be applied to the stack 3.

Comparative example

  An example of a conventional stack fastening method and a stack fastening jig will be described below as a comparative example (see FIG. 20 and the like). In the following, “′” is added to the reference numerals of the components corresponding to the above-described embodiments.

  A general fastening method is shown in FIGS. 20 to 28 as a reference example. Here, first, the end plate 8 ′ is the bottom surface (see FIG. 20), and a plurality of cells 2 ′ are stacked so as to be placed on the end plate 8 ′ (see FIG. 21). One end plate 8 'is overlapped (see FIG. 22). Thereafter, the stack 3 ′ is pressurized using the pressure shaft 6 ′ (may be via a pressure plate) (see FIG. 23), and the stack 3 ′ is fastened using the tension shaft 18 ′ (see FIG. 24). . When the fastening is completed (see FIG. 25), the stack 3 ′ is taken out from the case 4 ′ (see FIG. 26), the stack 3 ′ is put into the case 4 ′ (see FIG. 27), and the casing is completed (see FIG. 28). ). In the conventional method described above, the stack (cell laminate) 3 ′ is fastened between the end plate 8 ′ and the end plate 8 ′, and the fastened stack 3 ′ is inserted into the case 4 ′. (See FIGS. 20 to 28).

  Subsequently, another example of the conventional method is shown below. The conventional fastening method shown here has been performed according to the following procedures (1) to (6) (see FIG. 29, etc.).

(1) Lamination A telescopic lamination reference is attached to the end plate 8 ', and a stack (cell laminate) receiver is attached so as to penetrate the LWR side of the case 4' (see FIG. 31). At this time, stack receiving is performed in the LH ← → RH direction, and positioning is performed on the stacking reference in the UPR ← → LWR direction, and the cells 2 ′ are stacked. Reference numeral 18 'in the figure represents a tension shaft (see FIG. 29, etc.).

  More specifically, the assembling standard (stack receiver, stacking standard) at the time of positioning is configured by, for example, a standard for expanding and contracting (see FIG. 37), a fixed standard, a movable standard (see FIG. 38), and the like. The expansion / contraction reference | standard shown in FIG. 37 is a pair, and each is assembled | attached to the end plate 8 '. Moreover, the movable reference | standard here is comprised so that it may move on a linear guide. Alternatively, it is possible to use a positioning reference provided at two places on the long side of the cell and one place on the short side.

(2) Pull-in When the stack 3 ′ has reached a certain length (for example, 100 cells), a cell retainer is stacked on the stack RH side and clamped between the cell retainer and the stack receiver (see FIG. 32). By moving the stack receiver in the LH direction, the cell 2 ′ is pulled into the case 4 ′ while applying a restraining load so that the cell 2 ′ is not displaced.

(3) Stack movement In the state where all the cells 2 'are stacked, the stack is transferred from the stack receiver to the pressure shaft 6'. Thereafter, the end plate 8 ′ is moved in the RH direction and pressurized (see FIG. 33). The stack 3 ′ is inserted into the case 4 ′ in a compressed state.

(4) End plate fastening When the case 4 'and the end plate 8' are fastened, the stretchable stacking standard is removed from the endplate 8 ', and all stretchable parts are pushed in (see FIG. 34).

(5) Pre-creep The stack reference is removed downward from the case LWR opening, and pre-creep is performed (see FIG. 35).

(6) Stack fastening The pressure shaft 6 ′ and the load adjusting screw are assembled, the fastening load is removed, the load is transferred to the stack 3 ′, and the fastening is completed (see FIG. 36).

  However, the conventional fastening method as described above has problems as described below (see FIG. 39 and the like).

<Lamination misalignment>
Since the restraining force to the cell 2 ′ is small, the cell 2 ′ is lifted by the sliding resistance when the stack 3 ′ is inserted into the case 4 ′, resulting in a stacking deviation due to this (FIG. 39, (See FIG. 40).

<Swell (1)>
The lamination standard was not rigid, and it was deformed when pre-creep was performed with the standard set (see FIG. 41). Further, since the pre-creep is performed after the stacking reference is removed, the swell may occur in the stack 3 ′ based on the weight of the cell 2 ′ and the bending due to the pressurization (see FIG. 42).

<Swell (2)>
Since there are two pressure parts on the shaft 6 ′ (see FIG. 43), the force in the vertical direction cannot be suppressed, and the stack 3 ′ bends and undulates similarly to the swell (1) described above. was there.

<Others>
Further, in the fuel cell stack, when the mounting position on the vehicle is under the FR seat, water may enter. In such an arrangement, water is likely to be applied, and the applied water may be collected there. If it is going to cope with such a subject, the components only for plugging the hole utilized at the time of an assembly will be needed separately. For example, the hydrogen ventilation cover in the case 4 ′ is assembled to the case URR surface (see FIG. 44), or the stack pressurizing hole is filled with the cover (see FIG. 45).

  The present invention is suitable for application when fastening a stack having an end plate on one side and stacking cells with the end plate at the end.

2 ... cell, 3 ... cell laminate (stack), 4 ... case, 5 ... through hole, 6 ... shaft (jig), 8 ... end plate, 10 ... cell pallet (jig)

Claims (3)

In a method of fastening a stack having an end plate on one side and stacking cells with the end plate at the end,
After stacking the cells, apply a load along the stacking direction with the shaft from the opposite side of the end plate in the cell stacking direction,
Holding the stacked cells,
The shaft is passed through the through hole of the case having a through hole through which the shaft can pass and is also for ventilation in the case,
Sliding the case along the shaft;
A stack fastening method comprising fastening the case and the end plate.   2. The stack fastening method according to claim 1, wherein the shaft is longer than the length of the stacked cells in the stacking direction.   A jig including a shaft used in the stack fastening method according to claim 1 or 2, wherein the shaft is longer than the length of the stacked cells in the stacking direction. Jig.

Images