JPH04101367A - Bipolar pole plate for layer-built cell - Google Patents

Abstract

PURPOSE:To strenghen binding between a pole main body and each frame and prevent an alternating current of electrolyte by binding an insulating frame body to the pole main body through an intermediate frame. CONSTITUTION:In a bipolar pole plate for layer-built cell which is formed with a pole main body 1 in a flat plate shape and an insulating frame body 3 made of synthetic resin which is formed integratedly on the outer circumferential edge part of the pole 1, the insulating frame body 3 is formed of the resin containing glass fiber in its synthetic resin. In addition, an intermediate frame 2 which is made of the same synthetic resin as the insulating frame body 3 containing no glass fiber is integratedly formed between the insulating frame body 3 and the outer circumferential edge part of the pole main body 1. Thus, binding between the pole main body 1 and the intermediate frame 2 as well as between the insulating frame body 3 and the intermediate frame 2 can be improved and the whole can be strengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a bipolar electrode plate of laminated electrodes.

B0 Summary of the Invention This invention relates to a bipolar electrode plate for a laminated battery, in which an intermediate frame made of synthetic resin is provided at the outer peripheral edge of a flat electrode body, and then a synthetic resin containing glass fiber is provided at the outer peripheral edge of the intermediate frame. By providing an insulating frame made of resin, the adhesion between the insulating frame and the electrode body becomes strong, which prevents exchange of electrolyte and maintains stable battery performance over a long period of time. It has been made possible.

C. Conventional technology Zinc-bromine batteries, zinc-chlorine batteries, redox flow batteries, etc. used for power storage use a laminated structure with bipolar electrodes to increase the energy density of the battery. There is. Taking a zinc-bromine battery as an example, a multi-cell stack structure is used as an element in a stacked battery as illustrated in FIG. This bolts the entire cell stack (hereinafter referred to as the stack) from both ends.

For example, a 30 mm
Constructed by stacking cells. That is, the stacked battery has one carbon plastic end plate electrode 1 connected to an external electrical system.
After stacking the separator plate 21 next to the current collecting mesh I9 of No. 8 with a packing 20 interposed therebetween, a spacer mesh 22 for maintaining a predetermined distance, a flat intermediate electrode 23 made of carbon plastic which is a bipolar electrode, and a packing 20 are placed. They are laminated one after another, and finally the carbon plastic end plate electrode I8 connected to the other external electrical system is layered, so that a total of 30 cells are laminated.

The stacked battery has a positive electrode manifold 24 and a negative electrode manifold 25, which are liquid flow holes, at the four corners of the battery.
and.

Each separator plate 21 is constructed by integrally molding a frame plate 21a around the separator 2 made of a microporous membrane, and microchannels 26 are installed in a symmetrical shape on both sides of the frame plate 21a. It consists of The microchannels 26 shown by solid lines on the negative side of the microchannels 26 uniformly spread the electrolytic solution introduced from the positive electrode manifold 24 on the diagonal line and flow it over the entire surface of the separator 2, or collect the solution therefrom. In addition, the microchannel 2 shown by the broken line on the other side
6 is for introducing and recovering the electrolytic solution from the negative electrode manifold 25.

In this way, between the electrodes arranged on both side surfaces of each separator plate 21, cells serving as a unit battery are formed, and 30 cells are connected in series.

Further, the intermediate electrode 23 of the battery as described above is made of a conductive carbon plastic plate 27 as illustrated in FIG.
A plastic insulating frame 28 was injection molded around the periphery.

In manufacturing this intermediate electrode 23, first, a carbon plastic plate 27 is formed by cutting a carbon plastic flat plate material into the size and shape of the electrode, which is then put into an injection mold with an insert, and the molten plastic material is poured into the carbon plastic plate 27. Injection, as illustrated in FIG. 4, the carbon plastic plate 2
As shown in FIG. 3, the periphery of the insulating frame 28 is joined at a so-called biting portion where the periphery of the insulating frame 28 has a uniform width all around, and is integrally formed.

D Problems to be Solved by the Invention In the conventional intermediate electrode 23 as described above, the welding of the molded part (so-called biting part) of the peripheral edge of the carbon plastic plate 27 so as to be enclosed by the insulating frame 28 is not successful. , this biting part tends to create a gap.

When a battery is constructed using such an intermediate electrode with a gap in the biting part, the positive electrode electrolyte and the negative electrode electrolyte, which are separated by the intermediate electrode 23, are separated as shown by the arrows in FIG. Another problem is that a liquid junction is formed in which the liquids flow into the front side or the back side of the intermediate electrode 23 and mix, resulting in a decrease in battery performance.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a bipolar electrode plate for a laminated battery that allows the circumferential side of a carphone plastic plate to be reliably bonded to an insulating frame.

E. Means for Solving the Problems This invention provides the following: A separator is interposed between the flat electrode plates as necessary, and a plurality of the electrode plates are laminated and integrated to form a battery reaction chamber between the electrode plates. A bipolar electrode plate for a laminated battery, the bipolar electrode plate comprising a flat electrode body and a synthetic resin insulating frame integrally formed on the outer periphery of the electrode. In the bipolar electrode plate of a battery, the insulating frame is formed of a resin containing glass fiber in a synthetic resin, and the insulating frame is disposed between the insulating frame and the outer peripheral edge of the electrode body. Made of the same synthetic resin,
In addition, an intermediate frame made of synthetic resin that does not contain glass fibers is integrally formed on the outer periphery of the insulating frame and the electrode body.

The F9 action intermediate frame is made of synthetic resin that does not contain glass fibers. Therefore, the adhesiveness between the electrode body and the intermediate frame is improved. Furthermore, since the insulating frame and the intermediate frame are bonded to each other using the same resin, they are strong.

G. Example An embodiment of the present invention will be described below based on the drawings.

In FIGS. 1A, B, and C, symbol 1 represents an electrode body of a bipolar electrode plate of a laminated battery, and this electrode body 1 is formed by cutting a carbon plastic flat plate material into a predetermined shape and size.

The cut electrode body 1 is placed as an insert in an injection mold (not shown), and a synthetic resin material not containing glass fiber is first injected onto the outer periphery of the electrode body 1 to form an intermediate frame 2 as shown in FIG. 1B. form. Since the electrode body 1 on which the intermediate frame 2 is formed is made of synthetic resin that does not contain glass fiber, the electrode body 1 and the intermediate frame 2 can be reliably bonded.

After the intermediate frame 2 is adhered to the electrode body 1, a synthetic resin containing glass fiber is injected to form the insulating frame 3 shown in FIG. 1C. When formed in this manner, the intermediate frame 2 and the insulating frame 3 are firmly bonded.

The bipolar electrode plate configured as described above can function as a partition plate when stacking unit cells and as a member constituting a battery reaction chamber.

Practically speaking, it can be used as a bipolar electrode for a metal halogen secondary battery or a doxflo battery that employs a stacked battery structure.

Note that the electrode main body 1 and the intermediate frame 2. The resin for the insulating frame 3 is a polyolefin resin, and particularly preferred are polyethylene, polypropylene, and ethylene-propylene copolymers.

H0 Effects of the Invention As described above, according to this invention, since the insulating frame is bonded to the electrode body through the intermediate frame, the bond between the electrode body and each frame can be extremely strong. Therefore, alternating current of the electrolyte can be prevented, and the performance of the battery can be stably maintained over a long period of time.

[Brief explanation of drawings]

1A, B, and C are structural explanatory diagrams showing the manufacturing means of an embodiment of the present invention, FIG. 2 is an exploded perspective view of the main parts of a laminated battery, FIG. 3 is a front view of the intermediate electrode, and FIG. 4 is a longitudinal cross-sectional view of Fig. 3,
FIG. 5 is an enlarged longitudinal sectional view of the main part. 1... Electrode body, 2... Intermediate frame, 3... Insulating frame. (A) Fig. 1: Explanatory diagram of the configuration of the manufacturing means of the embodiment (B) (C) Fig. 2: Disassembled perspective view of essential parts 1 Electrode main body 2 Intermediate frame 3 Seamless frame 1a @ Fig. 3 Front view of electrode Fig. 4 Longitudinal cross-sectional view of electrode Figure 5 Enlarged cross-sectional view of main parts

Claims (1)

[Claims] (1) A bipolar electrode plate for a stacked battery in which a plurality of flat electrode plates are laminated, with a separator interposed between them as necessary, and then integrated to form a battery reaction chamber between the electrode plates. In the bipolar electrode plate of a laminated battery, the bipolar electrode plate is formed of a flat electrode body and an insulating frame made of synthetic resin integrally formed on the outer peripheral edge of the electrode, wherein the insulating The frame is made of a resin containing glass fiber in a synthetic resin, and the same synthetic resin as the insulating frame is formed between the insulating frame and the outer peripheral edge of the electrode body,
A bipolar electrode plate for a laminated battery, wherein an intermediate frame made of a synthetic resin not containing glass fiber is integrally formed on the outer peripheral edge of the insulating frame and the electrode body.