JP2005183043A - Warm-up device of fuel battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warm-up device of a fuel battery capable of shortening time needed for warm-up of the battery or time needed for discharging hydrogen gas from a hydrogen storage alloy. <P>SOLUTION: The warm-up device of the fuel battery is provided with a fuel cell stack 4 structured of a plurality of cells 41 laminated and a fastening bolt 8 for restraining expansion due to lamination of the plurality of cells 41. The fastening bolt 8 functions as an MH system heater by the hydrogen storage alloy 83 being stored inside its hollow rod-shaped part 81. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel cell warm-up device for warming up a fuel cell.

  In recent years, fuel cells that are clean and have high energy efficiency have attracted attention as power sources for fuel cell vehicles. In this fuel cell, air containing oxygen is supplied to the cathode side and hydrogen is supplied to the anode side, whereby electricity is generated by reacting these hydrogen and oxygen.

  By the way, the fuel cell exhibits its performance at a certain temperature. For example, a proton exchange membrane fuel cell (PEM fuel cell [PEM: Proton Exchange Membrane]), which is attracting attention as a power plant for fuel cell vehicles, has a temperature of about 80 ° C. Electromotive force) is reduced. For this reason, when starting a fuel cell vehicle in winter or in a cold region, it is necessary to warm up the fuel cell (that is, to heat and warm the fuel cell to a predetermined temperature).

  In order to solve such a problem, conventionally, there is a technique for warming up a fuel cell using an MH type heater having a hydrogen storage alloy that generates heat by storing hydrogen (for example, see Patent Document 1). Specifically, in this technique, the MH heater generates heat by supplying hydrogen gas as fuel, and the fuel cell is warmed by transferring heat from the MH heater to the fuel cell via the cooling water. Be fired. When the fuel cell has been warmed up, the heat from the fuel cell is transmitted to the MH heater via the coolant, and hydrogen gas is released from the MH heater and returned to the fuel cell. It has become. Therefore, with this technology, it is possible to warm up the fuel cell without consuming unnecessary energy.

JP 2002-222658 A (paragraphs 0036 to 0038, FIG. 5)

  However, in the above-described conventional technology, heat from the MH heater is transmitted to the fuel cell via the cooling water, so that there is a problem that it takes time to warm up the fuel cell. Also, when returning the hydrogen gas in the MH heater to the fuel cell, the heat from the fuel cell is transferred to the MH heater via the cooling water, so that the hydrogen gas is removed from the hydrogen storage alloy in the MH heater. There was a problem that it took time to release all.

  Therefore, an object of the present invention is to provide a fuel cell warming-up device that can shorten the time taken to warm up the fuel cell and the time taken to release hydrogen gas from the hydrogen storage alloy.

  The invention according to claim 1 of the present invention that solves the above-mentioned problems is a fuel cell stack configured by stacking a plurality of cells, and generates heat by absorbing hydrogen and absorbs ambient heat. A fuel cell that has a hydrogen storage alloy that releases hydrogen at a temperature and heats the fuel cell stack by the hydrogen storage heat of the hydrogen storage alloy by allowing the hydrogen storage alloy to store hydrogen when the fuel cell stack is warmed up The warming-up device is characterized in that the hydrogen storage alloy is accommodated in at least a part of a holding member for suppressing spread due to the stacking of the plurality of cells.

  According to the first aspect of the present invention, since the hydrogen storage alloy is accommodated in at least a part of the holding member for suppressing the spread due to the stacking of the plurality of cells, the fuel cell stack is directly heated by the hydrogen storage alloy. In addition, the hydrogen storage alloy can be directly heated by the fuel cell stack. Further, by accommodating the hydrogen storage alloy in at least a part of the holding member, the part becomes an MH type heater, so that it is not necessary to separately provide the MH type heater, and the cost can be reduced accordingly.

  The invention according to claim 2 is the warm-up device for the fuel cell according to claim 1, wherein the holding member is a fastening bolt that penetrates the plurality of cells, and a rod-like portion of the fastening bolt. Further, the hydrogen storage alloy is accommodated.

  According to the second aspect of the present invention, since the hydrogen storage alloy is accommodated in the rod-shaped portion of the fastening bolt that penetrates the plurality of cells, all the cells can be uniformly heated with the hydrogen storage alloy. In all the cells, the entire hydrogen storage alloy in the rod-shaped portion can be heated.

  A third aspect of the present invention is the fuel cell warm-up device according to the first aspect, wherein the holding member is a battery case formed so as to surround the fuel cell stack. The hydrogen storage alloy is accommodated in an extending wall portion extending in the stacking direction of the plurality of cells among the constituting wall portions.

  According to the invention described in claim 3, since the hydrogen storage alloy is accommodated in the extending wall portion extending in the stacking direction of the plurality of cells, it is possible to uniformly heat all the cells with this hydrogen storage alloy. In addition, all the cells can heat the entire hydrogen storage alloy in the extending wall portion.

  A fourth aspect of the present invention is the fuel cell warm-up device according to the third aspect, wherein the ends of the wall portions constituting the battery case are located outside the cells at both ends of the fuel cell stack. The hydrogen storage alloy is accommodated in the wall portion.

  According to the invention of claim 4, since the hydrogen storage alloy is accommodated in the end wall portions located outside the cells at both ends of the fuel cell stack, the cells at both ends of the fuel cell stack are actively heated. can do. As a result, for example, even when the fuel cell stack is cooled from both ends by stopping the fuel cell stack that has been operating until now, the temperature of the fuel cell stack at the time of restart is the highest. Since the cells at both end portions where the temperature is lowered are intensively heated, the fuel cell stack can be efficiently heated.

  According to the first aspect of the present invention, since the portion in which the hydrogen storage alloy is accommodated and the fuel cell stack exchange heat directly without passing through the cooling water, the time required for warming up the fuel cell. In addition, the time required for releasing hydrogen gas from the hydrogen storage alloy can be shortened. Further, by accommodating the hydrogen storage alloy in at least a part of the holding member, the part becomes an MH type heater, so that it is not necessary to separately provide the MH type heater, and the cost can be reduced accordingly.

  According to the second aspect of the present invention, since the hydrogen storage alloy is accommodated in the rod-shaped portion of the fastening bolt that penetrates the plurality of cells, all the cells can be uniformly heated with the hydrogen storage alloy. In all the cells, the entire hydrogen storage alloy in the rod-shaped portion can be heated.

  According to the invention described in claim 3, since the hydrogen storage alloy is accommodated in the extending wall portion extending in the stacking direction of the plurality of cells, it is possible to uniformly heat all the cells with this hydrogen storage alloy. In addition, all the cells can heat the entire hydrogen storage alloy in the extending wall portion.

  According to the invention described in claim 4, since the hydrogen storage alloy is accommodated in the end wall portion of the battery case, for example, the fuel cell stack is moved from both ends thereof by stopping the fuel cell stack that has been operated so far. Even in the case of being cooled, the cells at both ends of the fuel cell stack where the temperature is the lowest are concentratedly heated at the time of restart to efficiently heat the entire fuel cell stack. Is possible.

[First Embodiment]
Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a plan view showing a fuel cell vehicle equipped with a fuel cell warm-up device according to the first embodiment, and FIG. 2 shows a fuel cell stack constituting the fuel cell warm-up device. They are a perspective view (a) which shows a bolt, and an exploded perspective view (b) which shows the state where the fuel cell stack of (a) was disassembled. FIG. 3 is a cross-sectional view showing details of the fuel cell stack and the fastening bolts.

  As shown in FIG. 1, the fuel cell vehicle 1 is provided with a fuel cell system box 2 under the floor at a substantially central portion thereof. Inside the fuel cell system box 2, a fuel cell system, that is, a temperature controller 3, a fuel cell stack 4, a humidifier 5 and the like are arranged at appropriate positions. The fuel cell system includes a cooling device CM and a high-pressure hydrogen container 6 shown in FIG. 4 and a compressor (not shown) for supplying air to the fuel cell stack 4 in addition to the devices 3 to 5.

  As shown in FIG. 2A, the fuel cell stack 4 is configured by stacking a plurality of cells 41. In FIG. 2, for convenience, the structure of the fuel cell stack 4 (for example, the structure of each cell 41) is shown in a simplified manner. Specifically, the structure of the fuel cell stack 4 is as shown in FIG. It has a simple structure.

  As shown in FIG. 3, the cell 41 is mainly composed of a membrane electrode assembly MEA. The membrane electrode structure MEA includes a polymer electrolyte membrane PEM and a solid electrode. It is composed of an anode side electrode 41a and a cathode side electrode 41b arranged with a molecular electrolyte membrane PEM interposed therebetween. The cell 41 is sandwiched between separators 42 made of metal or carbon having good conductivity. Further, in order to prevent hydrogen gas or air from flowing out between the portions of the solid polymer electrolyte membrane PEM protruding from the anode side electrode 41a and the cathode side electrode 41b and the separators 42 on both sides thereof. The sealing member 43 is provided. Further, as shown in FIG. 2B, an insertion hole 41c is formed at an appropriate position of the cell 41 for inserting a tightening bolt 8 described later.

  Further, as shown in FIGS. 2A and 2B, the fuel cell stack 4 is fixed by fastening the holding plates 7 disposed at both ends thereof with fastening bolts 8. . That is, the spread due to the stacking of the plurality of cells 41 is suppressed by the holding plate 7 and the fastening bolt 8 that are holding members. Incidentally, the fuel cell warm-up device according to the present embodiment is mainly composed of the fuel cell stack 4 and the fastening bolts 8.

  The holding plate 7 is a plate body that is formed larger than each cell 41, and an insertion hole 7 a for inserting the fastening bolt 8 is formed at an appropriate position. The fastening bolt 8 is mainly composed of a rod-like portion 81 formed with a length that can penetrate the plurality of cells 41 and a head portion 82 for engaging a tool such as a spanner or a wrench. The rod-like portion 81 is formed with a male screw portion 81a for screwing the nut N into the tip portion.

  Further, as shown in FIG. 3, the rod-like portion 81 is formed in a hollow cylindrical shape having a space A therein, and a powdered hydrogen storage alloy 83 is accommodated therein. The space A is formed from one end side to the other end side of the plurality of stacked cells 41, and the hydrogen storage alloy 83 is also packed from one end side to the other end side of the plurality of stacked cells 41. Yes. That is, the hydrogen storage alloy 83 can exchange heat with all the cells 41 via the rod-shaped portion 81.

The hydrogen storage alloy 83 has a property of generating heat by storing hydrogen gas and releasing hydrogen gas by absorbing ambient heat. In addition, as such a hydrogen storage alloy 83, the following can be used, for example.
AB ₂ type alloy (Laves phase _{alloys); TiCr 2, (Zr,} Ti) (Ni, Mn, V, Fe) 2 ·· AB 5 type alloys; LaNi _5, MnNi ₅ ·· BCC alloys; Ti-V- Cr, Ti-V-Mn, etc .; Mg-based alloy

  And as above-mentioned, the rod-shaped part 81 is comprised, This rod-shaped part 81 will function as a MH type heater. In other words, the rod-like portion 81 is constituted by a MH heater composed of a hydrogen storage alloy 83 and a storage container for storing the hydrogen storage alloy 83. The head 82 is formed with a communication hole 82a that communicates with the inside of the rod-shaped portion 81 and the inside of the occlusion / discharge pipe P2 described later.

  Next, a fuel cell system including the fuel cell stack 4 and the fastening bolts 8 will be described with reference to FIG. In the drawings to be referred to, FIG. 4 is a configuration diagram showing a fuel cell system including a fuel cell stack and a fastening bolt.

  As shown in FIG. 4, the fuel cell system includes two sets of the fuel cell stack 4 and the clamping bolt 8 described above, a high-pressure hydrogen container 6, a hydrogen supply pipe P1, an occlusion discharge pipe P2, and a cooling device CM. It is mainly equipped with. The high-pressure hydrogen container 6 is a container for storing hydrogen gas that becomes fuel of the fuel cell stack 4. In FIG. 4, for the sake of convenience, a humidifier for humidifying the hydrogen gas, a circulation pipe for returning the discharged hydrogen gas to the fuel cell stack 4 again, a compressor for supplying air, and the like are omitted. The shape of the fastening bolt 8 is shown in a simplified manner.

  The hydrogen supply pipe P <b> 1 is a pipe for introducing hydrogen gas from the high-pressure hydrogen container 6 to the gas supply amount adjustment unit GA for adjusting the supply amount of hydrogen gas and air provided in the fuel cell stack 4. The hydrogen supply pipe P1 is provided with a primary regulator R1 and a secondary regulator R2 in order from the high-pressure hydrogen container 6 side.

  The primary regulator R1 and the secondary regulator R2 are pressure reducing valves for reducing the pressure of the hydrogen gas supplied from the upstream side. Therefore, the pressure relationship from the high pressure hydrogen container 6 to the fuel cell stack 4 is highest from the high pressure hydrogen container 6 to the primary regulator R1, and then from the primary regulator R1 to the secondary regulator R2, and from the secondary regulator R2. The relationship is such that the gas supply amount adjustment unit GA is the lowest. In the following description, for the sake of convenience, the line between the high-pressure hydrogen container 6 and the primary regulator R1 is the high-pressure line HL, the line between the primary regulator R1 and the secondary regulator R2 is the medium-pressure line ML, and the secondary regulator R2. A line between the gas supply amount adjustment units GA is referred to as a low pressure line LL.

  The occlusion / discharge pipe P2 is a pipe that communicates with the intermediate pressure line ML and the inside of the tightening bolt 8 described above. The occlusion / discharge pipe P2 is provided with an occlusion / discharge valve V and a pressure sensor PS in this order from the intermediate pressure line ML side. The occlusion discharge valve V is opened and closed by a control device (not shown) to switch the communication state of the occlusion discharge pipe P2. The pressure sensor PS is a sensor that detects the pressure in the tightening bolt 8, and is disposed at an appropriate position between the occlusion discharge valve V and the tightening bolt 8.

  The cooling device CM is a device for cooling the fuel cell stack 4, and mainly includes a cooling water pipe C1 through which the cooling water flows, and a radiator C2 disposed at an appropriate position of the cooling water pipe C1. It is comprised with the circulation pump C3. The cooling water pipe C1 is connected to an appropriate position of the fuel cell stack 4, whereby the cooling water is supplied from the cooling water pipe C1 to each cell 41 (see FIG. 2) of the fuel cell stack 4. The cooling water flowing through each cell 41 is returned to the cooling water pipe C1. Further, a temperature sensor TS for detecting the temperature of the fuel cell stack 4 is provided in the vicinity of the cooling water outlet side of the fuel cell stack 4 in the cooling water pipe C1.

  The radiator C2 cools the cooling water flowing through the cooling water pipe C1 by rotating a fan (not shown). The circulation pump C3 is for circulating cooling water in a circulation flow path (closed flow path) constituted by each cell 41 of the fuel cell stack 4 and the cooling water pipe C1.

Next, a method for warming up the fuel cell stack 4 will be described with reference to FIGS. 5 and 6.
In the drawings to be referred to, FIG. 5 is a block diagram showing a method for warming up a fuel cell stack, and FIG. 6 is a block diagram showing a method for releasing hydrogen gas stored in a hydrogen storage alloy. In the warm-up method shown in FIG. 5, the hydrogen storage alloy 83 (see FIG. 3) in the tightening bolt 8 is not storing hydrogen gas, and the cooling device CM is not activated. It has become.

  As shown in FIG. 5, when the fuel cell stack 4 is started, first, the temperature of the fuel cell stack 4 is detected by the temperature sensor TS, and the detection signal is output to a control device (not shown). In this control device, it is determined whether or not the fuel cell stack 4 needs to be warmed up (warmed) based on a detection signal from the temperature sensor TS.

  When the control device determines that the fuel cell stack 4 needs to be warmed up, it opens the storage / release valve V. When the occlusion / discharge valve V is thus opened, medium-pressure hydrogen gas is supplied from the high-pressure hydrogen container 6 into the four clamping bolts 8 via the primary regulator R1. When medium-pressure hydrogen gas is supplied into the clamping bolt 8 in this way, the hydrogen storage alloy 83 (see FIG. 3) provided therein generates heat as the hydrogen gas is stored. Thereby, as shown in FIG. 3, all the cells 41 are directly warmed by the hydrogen storage alloy 83 from the center side.

  When the control device determines that the fuel cell stack 4 has been warmed up based on a detection signal from the temperature sensor TS, the control device closes the occlusion / discharge valve V and activates the cooling device CM. The fuel cell stack 4 is operated in the mode. As described above, when the fuel cell stack 4 is operated in the normal mode, each cell 41 (see FIG. 3) generates heat along with the electrochemical reaction. Thereby, as shown in FIG. 3, the fastening bolt 8 is directly heated by each cell 41 from the whole outside.

  When the clamping bolt 8 is heated in this way, hydrogen gas is released from the hydrogen storage alloy 83 inside the clamping bolt 8, thereby increasing the pressure in the clamping bolt 8. Then, as shown in FIG. 6, when the control device determines that the pressure in the tightening bolt 8 is higher than the pressure in the intermediate pressure line ML based on the detection signal from the pressure sensor PS, the control device The occlusion discharge valve V is opened. When the occlusion / discharge valve V is thus opened, the hydrogen gas in the clamping bolt 8 is transferred to the fuel cell stack via the intermediate pressure line ML, the secondary regulator R2, the low pressure line LL, and the gas supply amount adjusting unit GA. 4 will be supplied.

According to the above, the following effects can be obtained in the first embodiment.
(1) Since the hydrogen storage alloy 83 in the tightening bolt 8 and the fuel cell stack 4 directly exchange heat without passing through the cooling water, the time required for warming up the fuel cell stack 4, The time required for releasing hydrogen gas from the hydrogen storage alloy 83 in the fastening bolt 8 can be shortened.

(2) By causing the rod-like portion 81 of the tightening bolt 8 to function as an MH heater, there is no need to separately provide an MH heater, so the number of parts can be reduced and the cost can be reduced accordingly.
(3) Since the rod-shaped portion 81 of the fastening bolt 8 that penetrates the plurality of cells 41 functions as an MH heater, all the cells 41 can be heated evenly, and the entire rod-shaped portion 81 is composed of all the cells 41. Can be heated.

(4) Since there is no need to route a cooling water pipe to an MH heater separately provided as in the prior art, the pressure loss of the cooling water can be reduced.
(5) Since the space for the MH heater that has been separately provided in the prior art is not required, the system can be reduced in size accordingly.

As described above, the present invention is not limited to the first embodiment and can be implemented in various forms.
In the first embodiment, the hydrogen gas released from the hydrogen storage alloy 83 is returned to the intermediate pressure line ML, but the present invention is not limited to this and may be returned to the low pressure line LL. However, in this case, since it is necessary to appropriately provide a shut-off valve and a throttle so that the returned hydrogen gas does not become a disturbance, it is possible to lower the cost if the structure is returned to the intermediate pressure line ML as in this embodiment. Can do.

  In the first embodiment, the hydrogen storage alloy 83 is accommodated only in the rod-shaped portion 81 of the clamping bolt 8. However, the present invention is not limited to this, and the hydrogen storage alloy is stored in the head 82 and the holding plate 7 of the clamping bolt 8. The alloy 83 may be accommodated.

[Second Embodiment]
The second embodiment of the present invention will be described below. Since this embodiment is obtained by changing the holding member (holding plate 7 and tightening bolt 8) of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. To do. Further, the method for warming up the fuel cell is the same as that in the first embodiment, and the description thereof is omitted. In the drawings to be referred to, FIG. 7 is an exploded perspective view showing a battery case according to the second embodiment, and FIG. 8 is a configuration diagram showing a fuel cell system provided with a battery case containing a fuel cell stack.

  As shown in FIG. 7, the fuel cell stack 4 is accommodated in a box-shaped battery case (holding member) 9. The battery case 9 suppresses the spread due to the stacking of the plurality of cells 41. The battery case 9 mainly includes a pair of side wall portions 91, a pair of end wall portions 92, a pair of upper wall portions 93, and a bottom wall portion 94. It consists of In the present embodiment, only the side wall portion 91 of the extending wall portions of the side wall portion 91, the upper wall portion 93, and the bottom wall portion 94 is composed of an MH heater.

  The side wall portion 91 is formed in a hollow rectangular parallelepiped shape, and the above-described hydrogen storage alloy 83 is packed therein. In addition, a communication hole 91 a that communicates with the inside of the occlusion discharge pipe P <b> 2 and the inside of the side wall 91 is formed at an appropriate position of the side wall 91. The end wall portions 92 are located outside the cells 41 at both ends of the fuel cell stack 4, and are joined while being sandwiched between the end portions of the pair of side wall portions 91, so that the plurality of cells 41 are spread. It has come to contribute to the suppression of. The fuel cell stack 4 is accommodated in the battery case 9 by joining the upper wall part 93 and the bottom wall part 94 to the upper side and the lower side of the side wall part 91 and the end wall part 92 joined in this way. The Rukoto.

  As shown in FIG. 8, two battery cases 9 containing the fuel cell stack 4 are provided in the fuel cell system, and the two battery cases 9 are arranged so that the side walls 91 are in contact with each other. Arranged in parallel. Note that the fuel cell system in FIG. 8 is the same in other structures except that the position of the gas supply amount adjustment unit GA is different from that in the first embodiment.

According to the above, the following effects can be obtained in the second embodiment.
Since the side wall portion 91 as the extending wall portion extending in the stacking direction of the plurality of cells 41 is configured by the MH heater, all the cells 41 are heated evenly by the hydrogen storage alloy 83 in the side wall portion 91. In addition, all the cells 41 can heat the entire hydrogen storage alloy 83.

As described above, the present invention is not limited to the second embodiment and can be implemented in various forms.
In the second embodiment, the hydrogen storage alloy 83 is accommodated only in the side wall portion 91, but the present invention is not limited to this, and the hydrogen storage alloy 83 is provided in the end wall portion 92, the upper wall portion 93, or the bottom wall portion 94. It may be accommodated. In particular, when the hydrogen storage alloy 83 is accommodated in the end wall portion 92, for example, when the fuel cell stack 4 that has been operated so far is stopped, the fuel cell stack 4 is cooled from both ends thereof. Even when the fuel cell stack 4 is restarted, the cells 41 at both ends of the fuel cell stack 4 where the temperature is the lowest are intensively heated, so that the entire fuel cell stack 4 can be efficiently heated.

It is a top view which shows the fuel cell vehicle provided with the warming-up apparatus of the fuel cell which concerns on 1st Embodiment. FIG. 2 is a perspective view (a) showing a fuel cell stack and fastening bolts constituting a warm-up device for a fuel cell, and an exploded perspective view (b) showing a state in which the fuel cell stack of (a) is disassembled. It is sectional drawing which shows the detail of a fuel cell stack and a fastening bolt. It is a block diagram which shows the fuel cell system provided with the fuel cell stack and the fastening bolt. It is a block diagram which shows the warming-up method of a fuel cell stack. It is a block diagram which shows the method to discharge | release the hydrogen gas occluded by the hydrogen storage alloy. It is a disassembled perspective view which shows the battery case which concerns on 2nd Embodiment. It is a block diagram which shows the fuel cell system provided with the battery case which accommodated the fuel cell stack.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Fuel cell stack 41 Cell 41a Anode side electrode 41b Cathode side electrode 41c Insertion hole 42 Separator 43 Seal member MEA Membrane electrode structure PEM Solid polymer electrolyte membrane 7 Holding plate (holding member)
7a Insertion hole 8 Tightening bolt (holding member)
81 Rod-shaped part 82 Head part 82a Communication hole 83 Hydrogen storage alloy 9 Battery case (holding member)
91 Side wall (extended wall)
91a Communicating hole 92 End wall part 93 Upper wall part (extending wall part)
94 Bottom wall (extending wall)

Claims (4)

A fuel cell stack configured by stacking a plurality of cells;
It has a hydrogen storage alloy that generates heat by storing hydrogen and releases hydrogen by absorbing ambient heat,
A fuel cell warm-up device that heats the fuel cell stack by hydrogen storage heat of the hydrogen storage alloy by storing hydrogen in the hydrogen storage alloy during warm-up of the fuel cell stack,
A warming-up device for a fuel cell, wherein the hydrogen storage alloy is accommodated in at least a part of a holding member for suppressing spread due to the stacking of the plurality of cells. The warm-up device for a fuel cell according to claim 1,
The holding member is a fastening bolt that penetrates the plurality of cells;
A warming-up device for a fuel cell, wherein the hydrogen storage alloy is accommodated in a rod-like portion of the tightening bolt. The warm-up device for a fuel cell according to claim 1,
The holding member is a battery case formed so as to surround the fuel cell stack,
A warming-up device for a fuel cell, wherein the hydrogen storage alloy is accommodated in an extending wall portion extending in a stacking direction of the plurality of cells among the wall portions constituting the battery case. A warm-up device for a fuel cell according to claim 3,
A warming-up device for a fuel cell, wherein the hydrogen storage alloy is accommodated in end wall portions located outside the cells at both ends of the fuel cell stack among the wall portions constituting the battery case.

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