JPH0133905B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method for manufacturing electrodes used in laminated batteries such as metal-halogen batteries. More specifically, the present invention relates to a method of manufacturing a framed electrode, which is manufactured by integrally press-molding an electrode part and an electrode frame that holds the electrode part.

B. Summary of the Invention In the present invention, when integrating an electrode member and a frame member by pressure molding, the outer shape of the conductive plastic electrode member as the electrode member is set at four corners of the rectangular shape of the inner opening of the frame member. This is a method for manufacturing a framed electrode that is preformed into a round shape.

In another invention, the preformed electrode member is surrounded by an insulating synthetic resin intermediate frame material having approximately the same thickness, and an insulating material having a width that covers the intermediate frame material and the peripheral portion of the electrode member is provided on the intermediate frame material. This is a method for manufacturing a framed electrode, in which the frame members are overlapped via an overlapping frame member made of synthetic resin and then pressure-molded.

C. Prior Art FIG. 1 is a basic configuration diagram of a metal-halogen battery, which is one of the batteries in which the electrode according to the present invention is used. This battery is composed of a battery reaction tank 51 in which the electrode 1 is installed with a separator 2 in between, a positive electrode liquid storage tank 52 and a negative electrode liquid storage tank 53.
Each electrolytic solution is circulated by a pump 54 from the storage tank side into each room partitioned by the separator 2 of the battery reaction tank 51.

FIG. 2 is an exploded perspective view showing an example of such a battery having a laminated structure. Each electrode 1 and separator 2 are both held by frames 11 and 12, sandwiched from both sides by end plates 6 and stacked, and each frame has a large number of bolt holes 12,
They are integrally tightened and connected by bolts 7 inserted through 22. One end plate 6 is provided with an electrolyte inlet 61, and the other end plate 6 is provided with an electrolyte outlet 62. The electrolytic solution entering from the electrolytic solution inlet 61 is rectified from the manifold 14 provided in the electrolytic frame 11 through the channel 15 and the microchannel 16, and is supplied to the electrode section 10. Here, the distance between the electrode 1 and the separator 2 may be several mm or less, and it is desirable that the electrode be thin in order to reduce the length (thickness) of the stacked layers.
Note that the area should be increased for large current. An example of the size of an electrode is length: width: thickness = 600: 500:
It is about 1 (mm).

Incidentally, the framed electrode used in such a laminated battery has conventionally been manufactured as shown in FIG. 3. That is, it is constructed by stacking the electrode and the sample that will become the electrode frame and inserting them into a mold, and an intermediate frame member 11b is placed outside the carbon plastic 10 that will become the electrode member to prevent air from entering. This intermediate frame member 11b is sandwiched between an upper frame member 11a and a lower frame member 11c, and these are inserted between an upper mold _A1 and a lower mold _A2 as shown in FIG. 4, and molded. Created. In the frame electrode manufactured in this way, the bonding state between the intermediate frame member 11b and the carbon plastic 10 is ideally as shown in FIG. This will cover 16 areas.

D Problems to be Solved by the Invention However, in reality, the shape of the carbon plastic in the electrode part after molding changes from the shape of the member before molding (the shape shown by the broken line) to the shape shown by the solid line, as shown in Figure 6. This caused deformation and spread, causing the following problems.

(a) The carbon plastic 10 slides between the microchannels 16 formed above and below, and the effective electrode surface extends to the grooves of the microchannels, exposing conductors at unnecessary locations.

(b) The spread state becomes a complicated shape as shown in FIG. 6, and cracking, peeling, and residual air bubbles occur particularly at the interface between the carbon plastic and the frame member in the part B surrounded by the solid line. This is because there is little spread of carbon plastic in this area.
The internal pressure (pressing force) at the interface during molding is relatively low, which creates disadvantageous conditions for fusion.
It is also thought that this is because a small amount of air mixed in other parts is concentrated.

(c) Since the carbon plastic spreads into the molten frame member and hardens, sink marks and the like occur on the frame surface, making it impossible to form a flat molded surface.

The present invention has been made with the aim of eliminating such problems with conventional framed electrodes.

E Means for Solving the Problems In the method for manufacturing a framed electrode according to the present invention, a plate-shaped electrode plate and an insulating frame made of synthetic resin are used, and a pair of flow channels are provided on opposite sides of the insulating frame. The insulating frame is provided around at least one surface of the electrode plate to form a battery reaction chamber surrounded by the insulating frame on the electrode plate surface, and the electrolyte is supplied from one of the flow paths to the battery reaction chamber. A method for manufacturing a framed electrode configured to allow electrolyte to flow into one chamber and flow out from the other, using a conductive plastic electrode member preformed into a substantially rectangular outer shape with rounded four corners as the electrode plate, An insulating synthetic resin frame member having an opening that matches the outer shape of the electrode member is used as a component of the insulating frame, and after the electrode member is placed in the opening of the frame member and surrounded by the opening, These are pressed together from the front and back using a mold.

In a method for manufacturing a framed electrode according to another invention,
A plate-shaped electrode plate and an insulating frame made of synthetic resin are used, a pair of flow passages are provided on opposite sides of the insulating frame, and the insulating frame is provided around at least one surface of the electrode plate. manufacturing a framed electrode having a structure in which a battery reaction chamber surrounded by an insulating frame is formed on the surface of the electrode plate, and the electrolyte flows into the battery reaction chamber from one of the flow paths and flows out from the other. In the method, a conductive plastic electrode member preformed into a substantially rectangular outer shape with rounded four corners is used as the electrode plate, and an intermediate member having an opening that matches the outer shape of the electrode member is used as a component of the insulating frame. Three types of insulating synthetic resins: a frame member, an overlapping frame member hollowed out in the center to a size that covers the edge of the opening, and an outer frame member sized to surround the hollowed out opening of the overlapping frame member. using a frame member made by a manufacturer with substantially the same external shape, placing the electrode member in the opening of the intermediate frame member and surrounding it, and then stacking the overlapping frame member so as to cover the edge of the opening; Then, the outer frame member is placed on top of the outer frame member, and then these are pressed together from the front and back using molds to integrate them.

C Effect In the present invention, a conductive plastic electrode member preformed into a substantially rectangular outer shape with rounded four corners is used as an electrode plate, and an opening that matches the outer shape of the electrode member is used as a component of an insulating frame. Using an insulating synthetic resin frame member having a At this time, the carbon plastic electrode member is spread evenly over the entire circumference, and at the interface with the insulating frame member, unevenness in the fused state can be significantly reduced, and the conductor is not exposed. An electrode having a flat electrode surface as a whole can be obtained.

In another invention, a conductive plastic electrode member preformed into a substantially rectangular outer shape with rounded four corners is used as an electrode plate, and an opening that matches the outer shape of the electrode member is used as a component of an insulating frame. an overlapping frame member hollowed out in the center to a size that covers the edge of the opening;
Using three types of frame members made of insulating synthetic resin and having substantially the same external shape as the outer frame member having a size that surrounds the hollow opening of the overlapping frame member, and arranging the electrode member within the opening of the intermediate frame member. After surrounding the periphery, the overlapping frame member is stacked so as to cover the edge of the opening, and then the outer frame member is stacked on top of that, and then they are pressed together from the front and back with a mold. In order to achieve this, fusion is also performed between the conductive plastic electrode member and the overlapping frame member, and compared to fusion bonding only by butting the conductive plastic and the insulating intermediate frame member, the fusion interface is can significantly improve the strength of

G Embodiment FIG. 7 shows that the basic shape of a carbon plastic member, which is one of the constituent members of the electrode part used in the electrode according to the present invention, is rectangular. The corners are rounded with a radius of R. Figure B has four rounded corners and the center of each side is recessed by h, and Figure C has four corners with a rounded shape. It has a rounded shape and is recessed by a distance h approximately at the center of the two upper and lower sides where the microchannels are formed. Although the shape of the intermediate frame member is not shown here, its inner shape is hollowed out to match the outer shape of the carbon plastic member 10.

The shape of the carbon plastic member 10 is
If the shape is rounded at the four corners as shown in the figure, the framed electrode formed in the same manner as in Figure 3 will be
As shown by the solid line in FIG. 8, the carbon plastic member 10 is spread evenly over the entire circumference. In addition, the broken line in FIG. 8A shows the spread state when the thickness of the carbon plastic member is thin. The amount of spreading increases as the thickness of the carbon plastic member increases. If the thickness of the carbon plastic is approximately the same as the gap between the mold and the electrode, there is no need to provide a recess at the center of the side as described above, but if the thickness of the carbon plastic member is thicker, this thickness It is preferable to provide a depression with a depth h corresponding to the width h in the center of the side. When the carbon plastic member 10 is spread evenly over the entire circumference in this way, it is possible to significantly reduce unevenness in the fused state at the interface with the frame member, and the conductor is not exposed, making it possible to As a result, an electrode having a flat electrode surface can be obtained.

FIG. 9 is an explanatory view for explaining another embodiment of the present invention, in which A is a plan view and B is an exploded cross-sectional view thereof. In this embodiment, the four corners of the carbon plastic member 10 are rounded, and the intermediate frame members 11b are placed above and below the intermediate frame member 11b.
1b and the carbon plastic member 10 are added, and the upper outer frame member 11a and the lower outer frame member 11c are connected to the intermediate frame member 1 via this overlap frame 11d.
It is configured to sandwich 1b. here,
The overlap frame member 11d is made of a sheet made of the same material as the intermediate frame member 11b with a thickness of 0.3 mm or less, and is hollowed out in the middle so as to overlap within 10 mm at most around the carbon plastic member 10, and the outer shape is the same as that of the intermediate frame member 11b. It is configured to be the same as the material 11b.

The frame electrode constructed in this way is also fused by the carbon plastic periphery and the overlapping frame part, and compared to fusion by only butting the carbon plastic and the intermediate frame material, the fusion interface is The strength of the electrode can be significantly improved, and a framed electrode with stable quality can be realized.

H. Effects of the Invention As explained above, in the present invention, a plate-shaped conductive plastic electrode member is preformed into a rectangular outer shape with four rounded corners, and the preformed electrode member is surrounded by an insulating frame member. Since the conductive plastic electrode member is surrounded and integrated by applying pressure with a mold from the front and back, the conductive plastic electrode member is spread evenly over the entire circumference during pressure molding, and at the interface with the frame member,
It is possible to significantly reduce the unevenness of the fused state, and also to obtain an electrode with a flat electrode surface as a whole without exposing the conductor, and to realize a framed electrode with stable quality at a low cost. It has the effect of being able to

In another invention, a plate-shaped conductive plastic electrode member is preformed into a rectangular shape with rounded four corners, and the preformed electrode member is surrounded by an insulating synthetic resin intermediate having approximately the same thickness. surrounded by a frame material, and overlapping the frame member on the electrode member surrounded by the intermediate frame material via an overlapping frame member made of insulating synthetic resin having a width that covers the intermediate frame material and the peripheral part of the electrode member,
Because it is integrated by applying pressure with a mold from the front and back, it also fuses the conductive plastic around the conductive plastic and the overlapping frame member, compared to fusion that only involves butting the conductive plastic and the intermediate frame member. hand,
The strength of the fused interface can be significantly improved,
It is possible to realize a framed electrode with stable quality.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram of a metal-halogen battery, which is one of the batteries in which the electrode according to the present invention is used.
FIG. 2 is an exploded perspective view showing an example of a stacked structure of such a battery, and FIGS. 3 and 4 are explanatory diagrams for explaining a conventional method for manufacturing a framed electrode.
5 and 6 are explanatory diagrams for explaining the state of the framed electrode after molding, FIG. 7 is a plan view showing the shape of the carbon plastic member used in the electrode according to the present invention, and FIG. FIG. 9 is an explanatory diagram for explaining the state of the framed electrode according to the present invention after molding, and FIG. 9 is an explanatory diagram for explaining another embodiment of the present invention. 1... Electrode, 11... Frame, 10... Electrode portion (carbon plastic member), 11b... Intermediate frame member, 11d... Overlap frame member, R... Roundness radius, h... Hollow depth.

Claims (1)

[Scope of Claims] 1. A plate-shaped electrode plate and an insulating frame made of synthetic resin are used, a pair of flow passages are provided on both opposing sides of the insulating frame, and at least one surface of the electrode plate is provided with a pair of flow passages. A configuration in which the insulating frame is provided around the periphery to form a battery reaction chamber surrounded by the insulating frame on the surface of the electrode plate, and the electrolyte is allowed to flow into the battery reaction chamber from one of the flow paths and flow out from the other. In the method for manufacturing a framed electrode, a conductive plastic electrode member preformed into a substantially rectangular outer shape with rounded four corners is used as the electrode plate, and a conductive plastic electrode member preformed into a substantially rectangular outer shape with rounded four corners is used as a component of the insulating frame, and the outer shape of the electrode member is Using an insulating synthetic resin frame member having matching openings, the electrode member is placed in the opening of the frame member and surrounded by it, and then these are pressurized from the front and back using molds to integrate them. A method for manufacturing a framed electrode, characterized in that: 2. A plate-shaped electrode plate and an insulating frame made of synthetic resin are used, a pair of flow passages are provided on opposite sides of the insulating frame, and the insulating frame is provided around at least one surface of the electrode plate. A framed electrode having a structure in which a battery reaction chamber surrounded by an insulating frame is formed on the electrode plate surface, and the electrolyte flows into the battery reaction chamber from one side of the flow path and the electrolyte flows out from the other side. In the manufacturing method, a conductive plastic electrode member preformed into a substantially rectangular outer shape with rounded four corners is used as the electrode plate, and an opening that matches the outer shape of the electrode member is used as a component of the insulating frame. Three types of insulating composition: an intermediate frame member, an overlapping frame member hollowed out in the center with a size that covers the edge of the opening, and an outer frame member with a size that surrounds the hollowed opening of the overlapping frame member. Using frame members made of resin and having substantially the same external shape, the electrode member is placed in the opening of the intermediate frame member to surround it, and then the overlapping frame member is stacked so as to cover the edge of the opening. . A method for manufacturing a framed electrode, which comprises: stacking the outer frame member thereon, and then pressurizing these from the front and back with a mold to integrate them.