JPH0615407Y2 - Stacked fuel cell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a laminated fuel cell, and more particularly to the attachment of a voltage measurement line to the laminated fuel cell.

[Conventional technology]

FIG. 4 is an overall sectional view showing a detection terminal of a conventional fuel cell disclosed in, for example, Japanese Utility Model Laid-Open No. 59-129169.

In the figure, reference numeral (1) is an electrode base material, at least one of a gas separation plate and a cooling plate (hereinafter simply referred to as an electrode base material, etc.), and (2) is provided on a side end surface of the electrode base material (1). Fine pores,
(3) is the platinum wire portion (4), the stainless steel wire portion (6) and the stainless steel wire portion (6) and the platinum wire portion (4) that are inserted into the pores (2)
A voltage measuring line detection terminal consisting of a junction (5) that connects with (7)
Is a heat and corrosion resistant coating covering the stainless wire portion (6), and (8) is a manifold.

Next, the operation of this conventional device will be described.

Platinum wire part (4) in the pores (2) provided in the electrode base material (1)
The platinum wire portion (4) of the voltage measurement wire (3), which is composed of the stainless wire portion (6) and the stainless wire portion (6) joined to this, is inserted. In this case, the voltage measurement line (3) is led out through the wall of the manifold (8), and the stainless wire portion (6) is bent and deformed to urge the platinum wire portion (4) in the insertion direction. I am busy. With this voltage measurement line (3), the potential (voltage) applied to the electrode base material or the like (1) is detected.

Here, the platinum wire is used to provide corrosion resistance to the surrounding atmosphere.

[Problems to be solved by the invention]

Since the detection terminal (3) of the voltage measurement line of the conventional laminated fuel cell is configured as described above, it is difficult to attach the detection terminal (3), and the operation hole for the attachment is provided in the manifold.
It is necessary to install it in (8) .Therefore, whenever inspection or maintenance is performed, the manifold
(8) must be removed and also the voltage measurement line (3)
Since the part is directly exposed to the atmosphere in the manifold (8), it is necessary to use a platinum wire and join it with a stainless wire, and in the part where the voltage measurement line penetrates the manifold (8). A gas seal is required, and the clearance between the core of the voltage measurement line and the coating is also on the manifold.
(8) There was a problem in terms of structure, assemblability, and reliability, such as the need to allow gas leakage by connecting the inside and outside or to provide a gas seal. .

The present invention has been made to solve the above-mentioned problems. It is possible to easily attach and check the voltage measurement line and maintain it outside the manifold, and also to attach it securely to the pores to ensure reliable measurement. It is an object of the present invention to obtain a laminated fuel cell which can be improved in performance, can be configured so as not to use an expensive platinum wire and a joint portion thereof, and can prevent leakage of gas inside and outside the manifold.

[Means for solving problems]

In the laminated fuel cell according to the present invention, the voltage measurement line is provided at any one of the four corners of the electrode base material or the like.

[Action]

In the laminated fuel cell according to the present invention, the voltage measurement lines are provided at four corners of the electrode base material or the like, or
It can be installed and inspected, and maintenance can be done without disturbing the manifold. In addition, since the voltage measuring line is provided outside the manifold, it is not necessary to shut off the atmosphere inside the manifold, and thus to use a special material such as a platinum wire or a seal.

〔Example〕

The present invention will be described below with reference to the drawings showing an embodiment thereof.

In FIG. 1, reference numeral (1) is an electrode substrate or the like, that is, at least one of an electrode substrate, a gas separation plate and a cooling plate, (11) is a voltage measurement line, and (12) is The core wire of the voltage measurement line (11), (13) a heat and corrosion resistant coating, for example, a coating made of fluororesin (PTFE), and (14) the voltage exposed at any of the four corners of the electrode substrate (1). A small diameter hole (14a) as a thin and deep small hole into which the core wire (12) part of the measurement line (11) is inserted, and a thick part into which the covered (13) part of the voltage measurement line (11) is inserted. Large hole (14
b) Pores consisting of and. Also, (15) is a small diameter hole (14a)
A heat and corrosion resistant conductive adhesive that connects and fixes the inner surface of the core wire (12), and (16) is the area around the opening of the large diameter hole (14b) and the coating (13) part of the voltage measurement wire (11). It is an adhesive with corrosion resistance and heat resistance for connecting and fixing airtightly.

Further, in FIGS. 2 and 3, (17) is a laminated body, that is, a stack, which is a laminated fuel cell main body formed by laminating the above-mentioned electrode base materials and the like (1). )
Is configured by alternately stacking a plurality of unit cells and a plurality of gas separation plates, and by stacking one cooling plate for each unit cell. Further, each unit cell is configured by interposing an electrolyte matrix between electrode base materials forming a fuel electrode and an air electrode. (18) is a manifold attached to the side surface of the stack (17) for supplying and exhausting gas, and the voltage measurement line (11) is led out from at least one of the four corners of the laminated fuel cell body (17). There is.

The voltage measurement line (11) is connected to the stack (17) outside the manifold (18) as shown in FIGS. The connection is made with the electrode base material (1) of the stack (17). The electrode base material (1) is provided with a pore (14) consisting of a small diameter hole (14a) in a thin and deep portion and a large diameter hole (14b) in a thick and shallow portion, and a voltage measurement line ( The core wire (12) of 11) is a small diameter hole (14a)
And the part of the coating (13) is inserted into the large diameter hole (14b). In this case, the small diameter hole (14a) of the pore (14) is the core wire (1
2) slightly larger diameter dimension, but also large diameter hole (14b)
Is chosen to have the same or slightly smaller diameter dimension as the coating (13). If the diameter of the large-diameter hole (14b) is selected to be slightly smaller than the diameter of the covering (13), the tip of the covering (13) should be finely tapered with sandpaper, etc. Push it into (14b) and secure it securely. Pore (14)
At the time of inserting the voltage measuring wire (11) into the core, a conductive adhesive (15) having heat and corrosion resistance is applied to the exposed portion of the core wire (12) in advance. The adhesive (15) overflowing due to the insertion of the voltage measurement line (11) into the pore (14) is finished at the opening of the pore (14), and the electrode base material (1) and the voltage measurement line (11) ) And the exposed portion of the core wire (12) is shielded from the surrounding atmosphere. Then, the potential (voltage) applied to the electrode base material (1) is
It is measured by this voltage measuring line (11).

In the above embodiment, an example in which a normal wire is used as the core wire (12) has been shown, but it is of course possible to use a fully plated wire or a platinum wire as in the conventional example.

Also, when installing the voltage measurement line (11), use the adhesive (15) (16)
However, of course, after deforming the core wire (12), the core wire (12) is inserted into the pores (14) and brought into contact with the electrode base material (1), etc., while the coating (13) closes the pores (14). It is also possible to use a glue so that it does not use an adhesive.

[Effect of device]

As described above, according to the present invention, the voltage measuring line is connected to the electrode base material or the like at the four corners or inside the manifold outside the manifold, so that the voltage measuring terminal can be installed, inspected, and maintained. It is easy and can be reliably installed in the pores to improve the reliability of measurement, and it can be manufactured at low cost because it does not require expensive platinum wire or its joint, and no seal is required. Thus, a laminated fuel cell having a simple structure can be obtained.
Further, the pores into which the voltage measurement line is inserted have a large diameter hole and a small diameter hole, and the coated end of the voltage measurement line is closely inserted into the large diameter hole located on the inlet side, Is electrically connected by a small hole located at the back, the core wire is reliably cut off from the electrolyte solution, the formation of local batteries due to liquid wetting is prevented, and therefore the voltage measurement line can be easily installed. It is also possible to obtain an effect that more accurate voltage measurement can be performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing a state in which a voltage measuring line according to an embodiment of the present invention is attached to an electrode substrate, a gas separation plate or a cooling plate, and FIG. 2 is an electrode substrate shown in FIG. Fig. 3 is a plan view of a laminated fuel cell comprising a plate or a cooling plate, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a conventional electrode base material, a gas separation plate or a cooling plate with a voltage measuring line attached. It is sectional drawing shown. (1) …… At least one of electrode base material, gas separation plate and cooling plate (electrode base material, etc.), (11) …… voltage measurement line, (12)
…… Core wire, (13) …… Coating, (14) …… Pore, (14a) …… Small diameter hole, (14b) …… Large diameter hole, (15) (16) …… Adhesive, (17) …
… Stacked fuel cell body (stack), (18) …… Manifold. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (5)

[Scope of utility model registration request] 1. A plurality of unit cells having an electrolyte matrix interposed between electrode base materials forming a fuel electrode and an air electrode and a plurality of gas separation plates are alternately laminated, and
It has a laminated body in which a cooling plate is laminated for each of the plurality of unit cells, a manifold provided on a side surface of the laminated body for supplying gas to the laminated body, a core wire, and a coating covering the core wire. And a voltage measuring line connected to the laminated body for monitoring the output voltage, the voltage measuring line is outside the manifold, the electrode base material, the gas separation plate. And the cooling plate is inserted into and connected to the pores provided at at least one of the four corners of at least one of the four corners of the cooling plate. It has a small hole located deep inside the large hole,
The coating end of the voltage measurement line is inserted in close contact with the hole having the large diameter, and the core wire exposed by peeling the coating of the voltage measurement line is inserted into the hole having the small diameter and electrically connected. A laminated fuel cell characterized by being provided. 2. The laminated fuel cell according to claim 1, wherein a voltage measurement line is provided for each of a plurality of cells or blocks. 3. The laminated fuel cell according to claim 1 or 2, wherein a heat resistant and corrosion resistant conductive adhesive is applied between the small diameter hole and the core wire. 4. A utility model registration claim in which a heat and corrosion resistant adhesive is airtightly applied to the periphery of the entrance of a hole having a large diameter and the coating of the voltage measurement line. Stacked fuel cell. 5. The laminated fuel cell according to any one of claims 1 to 4, wherein the coating of the voltage measuring line is made of a fluororesin (PTFE).