JPS59151771A - Electrolyte supply device of fuel cell - Google Patents

Abstract

PURPOSE:To increase the storage amount of electrolyte and improve operation rate of a cell by dividing a gas separating plate and forming a plurality of liquid reserve grooves in the plates. CONSTITUTION:A gas separating plate 2 is divided into a semiplate 21 having hydrogen supply grooves 7 and a semiplate 22 having air supply grooves 6, and a plurality of liquid reserve grooves 11 are formed on the joint flat surface 10 of the semiplate 21 and 22 so as to face then. Long through holes 12 which pass to both ends of each liquid reserve groove 11 are installed on both end seal surfaces 3 of the semiplate 21. The long through holes 12 which are arranged vertically in a stack S are connected each other in each end by a liquid supply hole 13. When liquid supply is required by dry up of a matrix of unit cell 1, electrolyte is poured from a set of liquid supply pipes 14 of the stack S. The electrolyte is supplied to the matrix through the liquid supply hole 13, long through hole 12, liquid reserve grooves 11 and faced long through hole 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to an electrolyte replenishment device for a matrix type health battery.

([ff1 Prior Art In this type of pot, an acidic electrolyte such as phosphoric acid is held in a matrix interposed between the counter electrodes, for example, between the 9 gas electrode and the frozen electrode. High m, (
The reaction gas at about 180° C. dries the matrix, which is a factor that lowers the battery performance by 7 points.

Therefore, a method is adopted in which an electrolyte storage section is provided in the battery and electrolyte # is supplied to the matrix from the outside via this storage section Z.

A conventional storage unit has carbonaceous gas separation plates (2) each having a valve hole between unit cells (1) of a stack (8) as shown in Fig. 2.
These storage grooves (4) are connected to the inside of the stack 18+ by through holes (5) connecting adjacent liquid storage grooves. in series (two connected to form a fluid replacement route).

However, since the amount of stored electrolyte is limited with just such a liquid storage groove (4), the battery is often activated! It was necessary to stop the system and replenish the fluid from outside, which caused a decrease in the operating rate.

(/→ Purpose of the Invention The object of the invention is to increase the storage electrolyte tv in the battery stack, extend the fluid replacement period, and improve the battery operating rate.

2) Structure of the Invention The present invention provides a method for joining half plates (a gas separation plate composed of two parts or a gas separation plate serving as a cooling plate and a cooling plate formed by joining the half plate and a cooling plate, in which a plurality of strips are formed on the joint surface Liquid reservoir grooves are formed, and both ends of these liquid reservoir grooves are communicated with through-holes formed in the sealing surfaces on both sides of the half plate, respectively, and both side edges of the matrix are visible through the opposed through-holes. It is something that

-1 Example A battery stack to which the present invention is applied (Sl is a unit cell (1) consisting of a nitrogen electrode (Pi, water electrode (Nl and matrix) as shown in FIGS. 1 and 2), The carbonaceous gas separation plates (2) each having a gas supply groove (6) and a hydrogen supply groove (7) in two intersecting directions are alternately stacked on each other, and several unit cells are stacked on each other. every 9 air passages (8)
A cooling plate (9) having a diameter is inserted.

Figures 6 and 4 (cross-sectional view taken along line X-X line C2 in Figure 6)
In the embodiment shown in FIG.
) with one and a half plays) (21) and nine air supply grooves ((31)
fL: Divided into allogeneic plates (22), and formed a plurality of liquid reservoir grooves (10)'e shadows facing the joint flat surfaces (10) of these half plates (21) and (22), respectively. This is the case.

On the other hand, the other embodiment of FIG. 5 includes the half plate (21),
A case is shown in which a liquid reservoir groove O1l similar to that of the previous embodiment is formed on the joint flat surface αQ of the one-and-a-half plate (91) constituting the cooling plate (9). In this case, 9 air passages (8)! The above-mentioned half plate (91) having 9 air supply grooves (6) is the allogenous plate (92) C in the above embodiment.
22)] to form a gas separation plate that also serves as a cooling plate.

In any of the above embodiments, the sealing surfaces (3) on both sides of the half plate (21) having one reaction gas groove, for example, hydrogen supply *(7)v, are connected to both ends of each of the liquid reservoir grooves 0D, respectively. A long hole has been drilled for communication. stack(
These long through holes (4) arranged in the vertical direction of Eil are in communication with each other through liquid supply holes (131) in each hole. It will be understood by the diagram.

The liquid reservoir grooves 111J are formed opposite to each of the flat joining surfaces as in each of the above embodiments, and when joined, these grooves are combined to form a liquid reservoir part. A liquid reservoir groove 011'& may be formed.

The method for joining the plates is to apply an adhesive such as FE'P dispersion containing graphite powder to the periphery of the joining surface of each plate, and heat-treat the plates at 350° C. for 1 hour under pressure to bond and fix them.

Each of the long through holes t12J1121 on the opposing seal surface (3) is covered by both sides of the matrix+Ml, but in this case, if the long through holes 02 are filled with a filler made of a similar material to the matrix, each liquid reservoir groove Impregnation into the matrix (Ml) can be facilitated by absorbing liquid from the 01) by hair and tube action.

When you need a replacement fluid Z due to the dryness of Mado IJ GGS (foundation), use the electrolyte solution from the pair of fluid supply vibes α4 of Stack 1B +! If it is injected, the liquid supply hole a3 and each through hole (121 and 121).

and each liquid reservoir elongated hole (Ill) is filled with electrolyte, and the matrix is impregnated with electrolyte from both sides of the matrix through the opposing through elongated hole (12171'), so that the liquid replenishment work can be done in a short time. I can do it.

During battery operation, these stored electrolytes are replenished into the matrix as the matrix dries, resulting in a stable battery reaction over a long period of time.

(F) Effects of the Invention According to the present invention, the joint surfaces of the split plates constituting the gas separation plate or the gas separation plate that also serves as a cooling plate? The main liquid reservoir is formed by using long through holes (two-way main liquid reservoir) formed in the opposing sealing surface of the C nibrate.
The amount of electrolyte stored can be significantly increased compared to the conventional one, and the C matrix is impregnated with electrolyte from both sides of the matrix that are in contact with the opposed long holes.

As described above, the present invention exhibits excellent effects such as extending the replenishment period by using a large amount of electrolyte stored in the battery stack, improving the operating rate of the battery, and shortening the time required for replenishing the matrix.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a battery stack, FIG. 2 is a perspective view of essential parts of a conventional fluid replacement device, FIG. 3 is a perspective view of essential parts showing an embodiment of the device of the present invention, and FIG. Cross-sectional view taken along the X-X line,
FIG. 5 is a perspective view of essential parts showing another embodiment of the apparatus of the present invention. Further, FIG. 6 shows a plan view Z of the gas separation plate in both of the above embodiments. S...Battery stack, 1...Unit cell, (M...
matrix, N...hydrogen electrode, P...nitrogen electrode), 2
...Gas separation plate (21...-half plate, 22...
・Allogeneic plate), 9...Cooling plate (91...-half plate, 92...Other plate), 3...Sealing surface, 6.7...Reactant gas groove, 8...・9 air passages, 10・
... Flat back surface, 11 ... Liquid reservoir groove, 12 ... Long through hole, 13 ... Liquid supply path. Figure 3 Figure 4

Claims (1)

[Scope of Claims] ■ Each flat back τ surface of one half plate with reactive gas grooves arranged in a Z-array and the other half plate with reactive gas grooves arranged in an array or a cooling plate having an air passage connected to each other. , drilling long through holes in both side sealing surfaces of the half plate, respectively, through which both side edges of the matrix can be seen, and forming a plurality of liquid reservoir grooves in communication with the opposing long holes on the flat back surface. 7. An electrolyte replenishing device for a health battery, characterized in that the long through holes of each plate are connected through a liquid supply hole.