JP5272334B2 - Connection structure of cell voltage detection connector in fuel cell stack - Google Patents

Description

  The present invention relates to a connection structure of a cell voltage detection connector in a fuel cell stack.

  In a conventional fuel cell stack configured by stacking a plurality of fuel cells, in order to confirm that normal power generation is performed in each fuel cell and to control the flow rate of the reaction gas based on the cell voltage In addition, a cell voltage detection connector is connected to the separator of the fuel cell, and the cell voltage is monitored (see Patent Document 1).

In order to enable monitoring even when the cell pitch is narrow, this cell voltage detection connector makes one terminal of a pair of terminals contact a separator which is one pole of a cell of the fuel cell, and the other terminal is The distance between the terminals is increased by making contact with a separator having the same polarity as the separator with which the one terminal contacts in adjacent fuel cells.
JP 2002-352820 A

  However, in the above conventional example, each terminal of the cell voltage detection connector is electrically connected from both sides in the cell stacking direction by sandwiching the same polarity separators of the adjacent fuel cells, so that When the distance (cell pitch) between the fuel cells to be operated is narrow, there is a possibility that adjacent terminals interfere with each other and cannot be connected.

  Accordingly, the present invention has been made in view of the above problems, and provides a connection structure of a cell voltage detection connector in a fuel cell stack suitable for connection without interfering terminals even when the cell pitch is narrow. Objective.

In the present invention, the cell voltage detector is formed in a direction that intersects with the stacking direction of the fuel cell stack by forming a protrusion by projecting a metal separator from the peripheral edge of the cell voltage detection section. A pair of lead portions that are provided to project from each other in the approaching direction from a separated position, and the tip ends of the pair of lead portions are bent in the stacking direction of the fuel cell stack so as to face each other, at least one being the other And a pair of contact pieces that are elastic in the approaching / separating direction, and the detection connector is configured to be inserted and electrically connected between the contact pieces so as to push open the pair of contact pieces. did.

Therefore, in the present invention, the cell voltage detector is made to protrude from the peripheral edge of the metal separator in the outer peripheral direction to form a protrusion, and the protrusion is cut out to intersect the stacking direction of the fuel cell stack. A pair of lead portions provided so as to protrude in the approaching direction from positions spaced apart in the direction, and the tip ends of the pair of lead portions are bent in the stacking direction of the fuel cell stack so as to face each other, at least one of them there was formed by a pair of contact pieces with elastic in the approaching direction apart from the other. That is, since the cell voltage detection unit is integrated with the separator, each separator is alternately stacked with the MEA and assembled as a fuel cell stack. And can be arranged in a line at an equal pitch (cell pitch).
Further, since having a structure for holding a detection connector the separator of the fuel cell by the elastic means, to hold the detecting connector in stacking width of the fuel cell, it can be connected to detection connector even if the cell pitch is narrow.
Furthermore, since the cell voltage detection unit is configured to support the elastic contact piece by the lead portion, the followability of the contact piece to the detection connector can be further enhanced, and the stack of separators stacked as a fuel cell stack Even if a shift in a direction orthogonal to the direction occurs, the electrical connection between the two can be made favorable.
In addition, since the cell voltage detection unit can be integrally formed by cutting and raising a metal separator as a cell voltage detection terminal during the press molding process for forming a gas flow path or the like for the material sheet metal to be the separator. Thus, molding can be performed without significantly increasing the number of molding steps and molding processes, and manufacturing can be performed without increasing the molding cost.

  Hereinafter, an embodiment of a connection structure of a cell voltage detection connector in a fuel cell stack of the present invention will be described with reference to FIGS. 1 to 9 show a first embodiment of a connection structure of a cell voltage detection connector in a fuel cell stack to which the present invention is applied, FIG. 1 is a perspective view of the fuel cell stack, and FIG. 2 constitutes the fuel cell stack. FIG. 3 is a rear view of the cathode separator, FIG. 4 is a sectional view of the fuel cell, FIGS. 5 and 6 are perspective views of the cell voltage detection terminals, and FIG. 7 is a cell voltage. FIG. 8 is a front view of the detection terminal, FIG. 8 is a four-side view of the cell voltage detection connector, and FIG. 9 is a perspective view of the cell voltage detection connector.

  In FIG. 1, a fuel cell stack 1 includes a current collector plate 4 and an insulating layer 5 outside a stack end of a cell stack 3 formed by stacking a plurality of fuel cells 2, and an end plate 6 outside the stack. Are stacked and arranged in this order. The tension plates 7 are bridged between the end plates 6 at the four corners, and the ends of the tension plates 7 are fixed to the end plates 6 with bolts 7A, so that the cell stack 3 of the fuel cell 2 is formed. A predetermined compressive force (fastening load) is applied in the stacking direction.

  As shown in FIGS. 2 and 4, the fuel cell 2 includes an electrolyte membrane 8A made of an ion exchange membrane and a membrane / electrode assembly 8 made of a pair of electrode catalyst layers 8B sandwiching the membrane from both sides (hereinafter referred to as “ MEA ”) and a pair of separators 9 and 10 holding the MEA 8 from the outside. The pair of separators 9 and 10 is formed of a conductor having a metal as a base material, for example. The anode separator 9 constituting one of the pair of separators 9 and 10 is a gas flow for supplying an anode gas such as hydrogen gas to the electrode catalyst layer 8B corresponding to the MEA 8 on the plate surface laminated adjacent to the MEA 8. A path 9A is provided. Further, the cathode separator 10 constituting the other side has a plate surface (back side in the figure) laminated adjacent to the MEA 8, and as shown in FIG. 3, the electrode catalyst layer 8B corresponding to the MEA 8 has air or the like. A gas flow path 10A for supplying cathode gas is provided, and the back side of the anode separator 9 of the adjacent fuel cell 2 stacked adjacent to the side not facing the MEA 8 (front side in FIG. 2) A refrigerant flow path 10B for flowing a refrigerant (cooling water or the like) for cooling the fuel cell is provided.

  The cathode gas and anode gas supplied to each electrode catalyst layer 8B cause an electrochemical reaction in the MEA 8 of the fuel cell 2 to generate an electromotive force. The electrochemical reaction is an exothermic reaction and is cooled by flowing a coolant (cooling water or the like) for cooling the fuel cell through the coolant channel 10B on the side not facing the MEA 8 of the cathode separator 10.

  Further, the MEA 8, the anode separator 9 and the cathode separator 10 constituting each fuel cell 2 are respectively connected to the inlets and outlets of the gas passages 9A and 10A and the refrigerant passage 10B (for anode gas and cathode gas), respectively. Through-holes 11A to 16A for forming manifolds that communicate independently are formed. Similarly, the current flow path 4 and the refrigerant flow (for anode gas and cathode gas) are also applied to the current collector plate 4 and the insulating layer 5 (not shown) constituting the fuel cell stack 1 and the end plate 6 disposed on one side. Through holes 11B to 16C for forming manifolds are formed which communicate with the inlet and the outlet of the passage 10B independently. And when these are laminated | stacked as the fuel cell stack 1, these through-holes 11A-16A and 11B-16B are piled up, the inlet manifold 11 and outlet manifold 14 for anode gas distribution | circulation, and cathode gas distribution | circulation The inlet manifold 13 and the outlet manifold 16, and the inlet manifold 12 and the outlet manifold 15 for circulating the refrigerant are formed penetrating in the cell stacking direction. These manifolds 11 to 16 are of an internal manifold type in which through holes 11A to 16A are provided in the separators 9 and 10 and the MEA 8, and the manifolds 11 to 16 are stacked.

  As shown in FIG. 1, the one end plate 6 is connected to the open ends of the manifolds 11 to 16, respectively, and introduce pipes 11C to 13C and discharge pipes 14C to 16C, respectively. Fuel gas (anode gas), oxidant gas (cathode gas) and refrigerant (cooling water) are introduced into the corresponding inlet manifolds 11-13 through -13C, and each outlet manifold 14-16 passes through the corresponding exhaust pipes 14C-16C. A fuel gas (anode gas), an oxidant gas (cathode gas) and a refrigerant (cooling water) that are not consumed in the reaction in the fuel cell 2 are discharged.

  In the fuel cell stack 1 having the above configuration, as shown in FIG. 5, protrusions 20 for detecting the cell voltage are formed by protruding from the peripheral edges of the pair of separators 9 and 10 in the outer peripheral direction. . The protrusion 20 has a configuration in which the rigidity in the bending direction of the protrusion 20 is ensured by bringing the tip surfaces of the pair of ribs 21 protruding in the approaching direction into contact with each other and joining them. The portions between them are separated from each other.

  A cell voltage detector 22 is provided on one of the spaced apart portions of the two protrusions 20 (here, the protrusion 20 on the anode separator 9 side), and the other (here, on the cathode separator 10 side). The protrusion 20) is formed with a notch 23 that fits into the cell voltage detector 22 and avoids interference with a detection connector 30 described later.

  The cell voltage detection unit 22 includes a lead part 24 protruding from each rib 21 in the approaching direction between the pair of ribs 21, and a protrusion on the cathode separator 10 side that is the other side, connected to the leading ends of both lead parts 24. The fitting part 25 as a contact piece bent toward the notch 23 side of the part 20 is provided. As shown in FIG. 7, both the fitting portions 25 are inclined obliquely, that is, bent in a state in which the leading ends approach each other from the bent portion to the lead portion 22 toward the leading end. The minimum interval of the fitting portion 25 is set to the interval dimension t1 on the distal end side. The fitting portion 25 is desirably bent at the tip side, for example, so as to be parallel to each other, as shown in the three examples on the right side in the drawing, and is closer to the center portion or the tip side. The parts are configured to protrude from each other. In this case, the minimum interval of the fitting portion 25 is set to the interval dimension t1 of the central portion or the portion closer to the tip side.

  In the state where the separators 9 and 10 are alternately stacked with the MEA 8 and assembled as the fuel cell stack 1, the cell voltage detection unit 22, as shown in FIG. 6, on the side in the stacking direction of the fuel cell stack 1, Each fuel cell 2 protrudes and is arranged in a line at an equal pitch (cell pitch).

  In the above embodiment, the cell voltage detection unit 22 is described as being provided on the projection 20 on the anode separator 9 side. However, the cell voltage detection unit 22 is provided on the projection 20 on the cathode separator 10 side. The protrusion 20 may be provided with a notch 23. Below, what provided the cell voltage detection part 22 in the projection part 20 by the side of the anode separator 9 is demonstrated.

  As shown in FIG. 8 (four-side view) and FIG. 9 (perspective view), the detection connector 30 includes a plate-like connector body 32 provided with protruding positioning ribs 31 in the stacking direction with cell pitch intervals on both surfaces, and positioning ribs. A plurality of electrical contacts 33 fixedly disposed on one surface of the connector main body 32 between 31 and a plurality of lead wires 34 connected to the plurality of electrical contacts 33 and connected to voltage detection means (not shown).

  The connector main body 32 has a main body portion 32A having the positioning ribs 31 on both surfaces at equal intervals (cell pitch), and a distal end with both surfaces extending from the main body portion 32A to the front end side with inclined surfaces to reduce the wall thickness. Part 32B. The plate-like connector main body 32 is configured to be insertable into the fitting portions 25 of the plurality of cell voltage detection portions 22 aligned at equal pitches in a row on the side in the stacking direction of the fuel cell stack 1, The distal end portion 32B guides the detection connector 30 between the fitting portions 25 while increasing the interval between the fitting portions 25 by the inclined surface. Each positioning rib 31 enters a gap in the stacking direction between the fitting portions 25 and positions the detection connector 30 in the stacking direction between the fitting portions 25 adjacent to each other. For this reason, the rib width of the positioning rib 31 is configured to be slightly smaller than the gap dimension between the fitting portions 25.

  The plurality of electrical contacts 33 fixedly disposed between the positioning ribs 31 of the connector main body 32 and the plurality of lead wires 34 are integrally formed by a flexible printed wiring 35 (FPC (Flexible Print Circuit)). The back surfaces of the plurality of electrical contacts 33 are supported by the constituent resin of the printed wiring board 35 and fixed between the positioning ribs 31 of the connector main body 32 by fixing means such as adhesion, and the front side is electrically The conductor is exposed without being covered with insulation by the constituent resin of the printed wiring board 35. Further, the connecting portion between each electrical contact 33 and each lead wire 34 and each lead wire 34 are insulated and coated with the constituent resin of the printed wiring board 35.

  If the thickness dimension including the printed wiring 35 in the region constituting the electrical contact 33 excluding the positioning rib 31 of the main body 32A is t3, the distal end side 32B has a smaller thickness dimension t2 (t2 <t3). Further, each dimension is set so as to satisfy the relationship of t2 <t1 <t3 as compared with the minimum dimension t1 of the fitting portion 25.

  In addition, although the said electrical contact 33 demonstrated what was arrange | positioned and fixed to the lower side of the connector main body 32, it may be fixedly arranged on the upper side of the connector main body 32, and can be made to function similarly.

  The connection operation of the detection connector 30 in the fuel cell stack 1 having the above configuration will be described below with reference to FIGS. First, as shown in FIG. 10, the front end 32 </ b> B of the detection connector 30 is positioned in the stacking direction of the fuel cells 2 to face the fitting portion 25 of the cell voltage detector 22 of the fuel cell stack 1. Next, by pushing the distal end portion 32B of the detection connector 30 into the fitting portion 25 of the cell voltage detection portion 22, the thickness t2 of the distal end portion 32B of the connector main body 32 is thinner than the minimum dimension t1 of the fitting portion 25. Since it is easy to insert, the detection connector 30 is inserted into the distal end portion 32B while the interval between the fitting portions 25 of the cell voltage detection portion 22 is increased by the inclined surface. The positioning rib 31 is inserted into the gap between the fitting portions 25 to position the detection connector 30 in the stacking direction.

  Further, since the thickness t3 of the connector main body 32 is thicker than the thickness t2 of the distal end portion 32B and thicker than the minimum dimension t1 of the fitting portion 25, the main body portion 32A of the detection connector 30 is located between the fitting portions 25. When inserted, as shown in FIG. 11, the body portion 32 </ b> A of the detection connector 30 is sandwiched by the elastic force between the fitting portions 25, and the detection connector 30 is held by the elastic force of the fitting portion 25. And the fitting part 25 and the electrical contact 33 fixedly arranged on the surface of the connector main body 32 contact, and the electrical connection of the cell voltage detection part 22 and the electrical contact 33 of the detection connector 30 is implement | achieved.

  In this case, since the holding function for electrical connection is not provided on the detection connector 30 side, there is no need to provide an elastic structure such as a spring, the structure can be simplified, and the detection connector 30 can be downsized. The weight can be reduced. Further, since the electrical contact 33 is kept in contact by the elastic force applied to the fitting portion 25, a contact load is generated at the contact point portion, and a stable electrical connection can be obtained. Further, since the detection connector 30 is provided with the positioning ribs 31, the attachment position of the detection connector 30 in the cell stacking direction can be positioned, and the assembling workability is improved.

  In addition, as shown in FIG. 12, even when a deviation in the stacking direction of the cell position occurs due to a variation in the thickness of the stacked components when the fuel cell stack 1 is stacked, a connection contact is provided in the thickness direction of the separator. Compared to the conventional example, there is redundancy in the stacking direction, the electrical connection state is maintained, and the contact followability is high. Further, as shown in FIG. 13, even if the center portion of the fitting portion 25 is displaced due to the displacement in the direction perpendicular to the stacking direction of the separators 9 and 10, the fitting portion 25 is deformed according to the displacement. By doing so, since the connection state with the electrical contact 33 can be maintained, the contact followability is high also in this respect. In order to improve the followability, reducing the width dimension of the lead portion 24 supporting the fitting portion 25 to such an extent that the strength can be maintained or increasing the length of the lead portion 24 increases the followability of the contact. This is an effective method.

  The shape of the fitting portion 25 of the cell voltage detection portion 22 is not limited to the above-described configuration. For example, as shown in FIG. 14, a rib 26 is provided across the connecting portion between the lead portion 24 and the fitting portion 25. Thereby, the elastic force of the fitting part 25 can be improved, the contact load of the fitting part 25 and the electrical contact 33 of the detection connector 30 can be increased, and the electrical connection state can be improved. In this case, as shown in FIG. 15, the fitting portion 25 is provided with a convex portion 27 (or a concave portion) extending toward the distal end side, whereby the rigidity of the fitting portion 25 itself is improved, and the fuel cell stack 1 It is possible to prevent unintentional deformation due to handling during lamination of the layers.

  In the cell voltage detection connector connection structure shown in FIG. 16 to FIG. 18, the cell voltage detection unit 22 has a spherical convex portion 28 at the center portion of the plate surface facing the fitting portion 25. The main body 32 is configured to be formed with concave portions 36 on both sides of which the spherical convex portions 28 are engaged. The electrical contact 33 fixedly disposed on the connector body 32 is disposed such that the contact surface is exposed on the bottom surface of the recess 36.

  In the cell voltage detection connector connection structure with this configuration, when the detection connector 30 is inserted into the cell voltage detection unit 22, the spherical convex portion 28 provided in the fitting portion 25 fits into the concave portion 36 provided in the connector main body 32. Accordingly, it is possible to prevent the detection connector 30 from being easily disconnected (disconnected), and to obtain an electrical contact that can maintain a stable contact state.

  The cell voltage detection unit 22 including the fitting unit 25 having the above configuration is formed by bending using a press in the same manner as the press molding process for forming a gas flow path or the like on the material sheet metal to be the separators 9 and 10. Therefore, the molding can be performed without significantly increasing the molding man-hours and the molding process, and the manufacturing can be performed without increasing the molding cost.

  In the above-described embodiment, the cell voltage detection terminal is described as having the fitting portion 25 that is integrally formed by cutting and raising the metal separators 9, 10. Alternatively, the cell voltage detection terminal formed separately may be fixed to the separators 9 and 10 in an electrically connected state.

  Moreover, in the said embodiment, although both the fitting parts 25 as a contact piece arrange | positioned spaced apart in the direction which cross | intersects the lamination direction as a cell voltage detection terminal demonstrated both having elasticity in the approaching / separating direction. Although not shown, only at least one of the contact pieces may have elasticity, and the other contact piece may not have elasticity in the approaching / separating direction. Similarly, both of the fitting portions 25 are described as being electrically connected to the separators 9 and 10, but only at least one contact piece is electrically connected to the separators 9 and 10. It may be a thing.

  In the present embodiment, the following effects can be achieved.

  (A) A fuel cell that detects a cell voltage by connecting a detection connector 30 to a cell voltage detection unit 22 formed by projecting from the peripheral edges of the separators 9 and 10 of a plurality of fuel cells 2 stacked in the fuel cell stack 1. The cell voltage detection connector connection structure in the stack 1 is configured such that the cell voltage detection unit 22 is electrically connected to the separators 9 and 10 and separated in a direction intersecting the stacking direction of the fuel cell stack 1. The detection connector 30 includes a fitting portion 25 as a pair of contact pieces that are arranged opposite to each other and elastic in the approaching / separating direction with respect to the other. The detection connector 30 opens the fitting portions 25 as the pair of contact pieces. In this case, the electrical connection with the separators 9 and 10 of the cell voltage detection unit 22 is performed between the contact pieces. It is made in either or both of the pair of contact pieces.

  For this reason, the structure which hold | maintains the detection connector 30 by the said elastic means to the separators 9 and 10 side of the fuel cell 2 is provided, and the detection connector 30 can be hold | maintained within the lamination width of the fuel cell 2, and a cell pitch is narrow. However, the detection connector 30 can be connected. Further, since the contact between the electrical contact 33 of the detection connector 30 and the fitting portion 25 as a contact terminal on the fuel cell 2 side is realized by a surface intersecting with the circumferential direction of the fuel cell 2, as in the conventional structure Compared with the case where the detection connector contacts with the surface crossing the cell stacking direction, there is redundancy in the cell stacking direction, and the followability to the positional shift of the cell stack can be improved. In addition, the terminal shape on the detection connector 30 side can be simplified, the detection connector 30 can be reduced in size and weight, and can be manufactured at a lower cost than a conventional structure having elastic means on the detection connector 30 side.

  (A) The fitting portion 25 as a pair of contact pieces is formed integrally with the separators 9 and 10 by bending the peripheral edges of the metal separators 9 and 10 constituting a part of the fuel cell 2. In the same manner as the press molding process for forming a gas flow path or the like for the material sheet metal to be the separators 9 and 10, it can be molded by bending with a press, and can be molded without a significant increase in molding man-hours and molding process, It can be manufactured without an increase in molding cost.

  (C) The fitting portion 25 as a pair of contact pieces is elastic in both of them, and by moving away from each other, the pair of contact pieces ( Even if a deviation occurs in the center position of the fitting part 25), both of the fitting parts 25 as a pair of contact pieces are deformed according to the deviation, so that the electrical contact 33 on the detection connector 30 side is connected. Can be maintained, and contact followability can be improved.

  (D) The detection connector 30 is fitted to a fitting portion 25 as a pair of contact pieces provided on the separators 9 and 10 to realize electrical connection therebetween, and the main body portion 32A. A tip end portion 32B inserted into the pair of contact pieces prior to the fitting, and a minimum distance t1 between the contact pieces is larger than a minimum thickness t2 of the tip end portion 32B of the detection connector 30; By being smaller than the thickness t3 of the main body portion 32A of the connector 30, the insertion property of the detection connector 30 can be improved, and the thickness (t3) of the main body portion 32A of the detection connector 30 is set to the separators 9 and 10. By being smaller than the minimum width (t1) between the fitting portions 25 as a pair of contact pieces on the side, the contact is held by the elastic force between the pair of fitting portions 25, and the reliability of the electrical contact can be improved. Can .

  (E) The fitting portion 25 as a pair of contact pieces is formed with a convex portion 28 or a concave portion at a portion facing each other, and the contact when the detection connector 30 is inserted into the pair of contact pieces By forming the engaging portion that engages with the convex portion 28 or the concave portion of the piece, it is possible to suppress the detection connector 30 from coming off from the pair of fitting portions 25 and to improve the reliability of the electrical contact. .

  (F) The detection connector 30 includes at least one rib 31 that enters the both sides in the cell stacking direction of the fitting portion 25 as the pair of contact pieces. Contact positioning can be realized.

The perspective view of the fuel cell stack which applies the connection structure of the cell voltage detection connector of one Embodiment of this invention. The disassembled perspective view of the fuel cell and end plate which similarly comprise a fuel cell stack. The rear view of a cathode separator. Sectional drawing of a fuel cell. The perspective view of a cell voltage detection part. The perspective view of the cell voltage detection part of the state laminated | stacked as a fuel cell stack. The front view of a cell voltage detection part. The front view (A) of a detection connector, a top view (B), a side view (C), and a bottom view (D). The perspective view of a detection connector. FIG. 3 is an explanatory diagram showing connection work of the cell detection connector 30 in the fuel cell stack 1. Sectional drawing of the state which connected the detection connector to the cell voltage detection part. FIG. 6 is another cross-sectional view showing a state in which a detection connector is connected to the cell voltage detection unit. Explanatory drawing which shows the shift | offset | difference in the lamination | stacking surface of a cell voltage detection part. The side view (A) and perspective view (B) which show the 2nd Example of a cell voltage detection part. The perspective view which shows the 3rd Example of a cell voltage detection part. The side view (A) and perspective view (B) which show the 4th Example of a cell voltage detection part. Sectional drawing of the horizontal direction in the connection state with the detection connector of the cell voltage detection part of 4th Example. Sectional drawing of the vertical direction in the connection state with the detection connector of the cell voltage detection part of 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell stack 2 Fuel cell 3 Cell laminated body 4 Current collector plate 5 Insulating layer 6 End plate 7 Tension plate 8 Membrane / electrode assembly, MEA
DESCRIPTION OF SYMBOLS 9 Anode separator 10 Cathode separator 11-13 Inlet manifold 14-16 Outlet manifold 20 Protrusion part 22 Cell voltage detection part 25 Fitting part as a pair of contact piece 30 Detection connector 31 Positioning rib 32 Connector main body 33 Electrical contact 34 Lead wire 35 Printed wiring board

Claims (7)

A cell voltage detection connector connection structure in a fuel cell stack that detects a cell voltage by connecting a detection connector to a cell voltage detection portion formed by projecting from the periphery of a separator of a plurality of fuel cell stacks stacked in a fuel cell stack There,
The cell voltage detection part is formed by protruding a metal separator in the outer peripheral direction from the peripheral edge to form a protrusion, and the protrusion is cut and separated in a direction intersecting with the stacking direction of the fuel cell stack. A pair of lead portions projecting in the approaching direction from each other, and the tip side of the pair of lead portions are bent in the stacking direction of the fuel cell stack so that they face each other, at least one of which is opposite to the other A pair of contact pieces that are elastic in the approaching and separating directions, and
The connection structure of the cell voltage detection connector in the fuel cell stack, wherein the detection connector is inserted between the contact pieces so as to push open the pair of contact pieces and is electrically connected. The separator is composed of an anode separator having a gas flow path for supplying an anode gas to a fuel battery cell, and a cathode separator having a gas flow path for supplying a cathode gas to the fuel battery cell,
The separators are joined at the protrusions by bringing the tip ends of a pair of ribs that project the back surfaces of the separators in the approaching direction into contact with each other, and the cell voltage detection is performed between the ribs of one of the separators. The cell voltage detection connector connection structure in the fuel cell stack according to claim 1, wherein a portion is provided, and a notch is provided between ribs of one of the other separators . 3. The fuel cell stack according to claim 1 , wherein electrical connection with the separator of the cell voltage detection unit is made in one or both of the pair of contact pieces . 4. Cell voltage detection connector connection structure.   The cell voltage detection connector connection structure in the fuel cell stack according to any one of claims 1 to 3, wherein both of the pair of contact pieces are elastic and approach and separate from each other. The detection connector is inserted into the pair of contact pieces prior to the fitting of the main body portion, which is fitted into a pair of contact pieces provided on the separator to realize electrical connection therebetween. With a tip,
The minimum distance dimension t1 of the contact piece is larger than the minimum thickness t2 of the front end portion of the detection connector and smaller than the thickness t3 of the main body portion of the detection connector. The connection structure of the cell voltage detection connector in the fuel cell stack as described in any one of these. In the pair of contact pieces, a convex portion or a concave portion is formed at portions facing each other,
6. The detection connector according to claim 1, further comprising an engaging portion that engages with a convex portion or a concave portion of the contact piece when inserted into the pair of contact pieces. The connection structure of the cell voltage detection connector in the fuel cell stack according to any one of the above. The cell in the fuel cell stack according to any one of claims 1 to 6, wherein the detection connector includes at least one side of a rib that enters a gap between a pair of contact pieces adjacent in the stacking direction. Connection structure of voltage detection connector.

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