JPS58206072A - Air-cooled fuel cell - Google Patents

Abstract

PURPOSE:To equalize the temperature distribution of the entire cell stack so as to realize a stabilized characteristic of an air-cooled fuel cell by preventing any rise or drop of the temperature of unit cells located in the ends of the cell stack by locating a carbonaceous auxiliary cooling plate having air paths between a gas- separating plate and a terminal plate which are located in the outermost end of the cell stack. CONSTITUTION:The upper and the lower end plates 9 and 9 of a stack which have no minifold are thermally insulated by being covered with asbestos or the like. When the thermal insulation is sufficient, unit cells located in the upper and the lower end so of the stack are, since they are cooled by air flowing in auxiliary cooling plates 20, not subjected to any excessive temperature rise and are maintained at temperature almost the same as that of a unit cell 1 installed between main cooling plates 6', thereby enabling a constant temperature to be maintained over the entire cell stack. In contrast, when the thermal insulation is insufficient, although the heat of the cell is removed through terminal plates 7, heat-resistant insulating plates 8 and the end plates 9 causing the end unit cells 1 to have temperature decrease and lose their reactivities, the air flowing in the auxiliary cooling plates 20 and air paths 21 works as a heat insulator, thereby end unit cells 1 can be prevented from being overcooled.

Description

[Detailed Description of the Invention] Air-cooled fuel cell C according to the present invention: What are the characteristics of the end cells of the battery stack? The purpose is to improve.

This wood cell has a unit diameter T: and each reaction gas supply groove +2
Carbonaceous gas separation plates (4) capable of 1131'' and carbonaceous gas separation plates (4) stacked together in large numbers (approx. 6) At the same time, attach the terminal plate (7) and the heat-resistant insulating plate 181 to both ends of the gourd body by tightening the terminal plate (7) and the heat-resistant insulating plate (i! (Sl 5.51
to be accomplished. In addition, on the nine opposing faces of this stack +81, the manifolds 11) on the inlet side and exit side of each reaction gas (air and wire) are airtightly installed.
Complete.

Manifold, lead tl (k) is introduced into 2 air, part of which is used as a reaction gas and sent to the supply groove (2) of the ``C gas separation plate 4'', where the battery reacts with C 2 and most of the other part is cooled. Air passage 15 + C feed n' ([
m Y j s oA Mae Huang's impeachment degree 62 is maintained.

The partial stack is placed on the cooling plate (61 cm).

Although the air passage (51
Cooling C1 of the 91 side stack becomes insufficient. Therefore, if the battery stack +8 side is sufficiently heated in a straight line, the unit cell peaks at both ends will bond the conductivity and cause a decrease in the lifespan of the battery. If the bunun is not sufficiently insulated, the end plate (9) will be used to dissipate the heat from the unit cell 1 at both ends.
There was a problem in that as the temperature in [) decreased, the battery characteristics deteriorated.

This invention has been improved in view of the problems faced by the present invention.

A carbonaceous auxiliary cooling plate (C1 or If the battery stack has poor insulation properties, it is characterized by being used for insulation and functioning as a heat insulator.

An example will be explained below, but which part is relevant? The double C is marked with the same - symbol.Auxiliary cooling plate 120a according to the present invention, as shown in FIG. 3, the outermost gas separation plate (4) of the battery stack An auxiliary cooling plate (6" (same as the cooling plate (61)) is inserted between the terminal plate (7) and the terminal plate (7). ), and its air passage r211 has a cross-sectional area set so that the air flow is approximately 〃 compared to the air passage (5) of the main cooling plate (6). This is because in the case of a plate, since the battery benefits from only one side, there is no need to reduce the cooling capacity χ except for the main cooling plate.

In the case of the present invention, manifold U11 = introduced air cover.

As in the conventional case, it is divided into the gas supply grooves (2) of each separation plate +41 and the air passages (5) of each main cooling plate (6) and acts as °C reaction gas and cooling gas, but at the same time serves as upper and lower auxiliary cooling. Board■
It also branches into the air passage QB. The supply air of the stack (S-\ is approximately 130~140゛C1 outlet side in the inlet side manifold G9?
0-CN&'t'.

The heat generated by the stack 181 raises the temperature by about 40-50°C.

Stacker bottom end plate without such a manifold +91
(91 is asbestos) 7Z is covered and insulated, but if this insulation is sufficient, the unit cells at the top and bottom ends of the stack will be.

The main cooling plate 161 is cooled by the air flowing through the auxiliary cooling plate 121'l without excessively increasing the temperature.
It is maintained at about the same temperature as the unit cell 11) in between, and controls the entire battery stack to keep the temperature constant.

If this insulation is insufficient, the terminal board (7),
Heat-resistant insulation board (8) and end plate (9)! [Battery heat exchanger] The temperature of the unit cell fl+ at the end decreases and impairs reactivity, but the auxiliary cooling plate (support) and its ventilation @
Since the total flow of air (approximately 13°C to 140°C) is required to act as a heat insulator, the end unit can be cooled or cooled over the bridge.

In accordance with the above, the present invention applies to a battery stack in which a terminal plate and an insulating plate are attached to the outer end surface of a stack of unit cells and a carbonaceous gas separation plate, and the terminal plate and the insulating plate are fastened by a thin metal end plate. In addition to the main cooling plate, which has a partial pressure divided into several units of cells, an auxiliary cooling plate Y having an air passage between the upper and lower outermost gas separation plates and the terminal plate is provided. , the partial stack at the end where the main cooling plate exists only on one side is cooled from the other side by the presence of the auxiliary cooling plate, and is maintained at approximately the same temperature as the partial stack between the main cooling plates; It will be done. In other words, if the insulation of the stack t'F is good, the front J pi auxiliary cooling plate is used for cooling, but if the insulation is poor, it is used for insulation by collecting heat from the upper and lower end plates. Prevents the temperature rise or fall of unit cells at the end of the stack 7 and prevents the temperature throughout the entire battery stack? 5 can be made more uniform and C can be stabilized.

[Brief explanation of the drawings] Figure 1 is a perspective view of the main parts of a conventional battery stack, $2
The figure is a plan view of the stack with the manifold attached, and FIG. 3 is a side view of the essential parts of the stack improved by the present invention. 1... Unit cell, 2, 3... Reaction gas supply groove.

Claims (1)

[Claims] ■ End face C of a stack of potential cells and carbonaceous waste separation plates:
Terminal board and insulating plate Y heavy male °C Tighten with metal end plate 1j
In the battery stack, there are several units of cells in the above-mentioned type 1.
An air-cooled Confucian battery characterized by the fact that a moving plate Z is provided between the outermost N:+ gas separation plate and the terminal plate (:, empty helmet passage?). The air-cooled component cell 1 according to claim 1, wherein the air passage of the cooling plate has a cross-sectional area of approximately half that of the main cooling plate.