JPH0662460U - Current collector for zinc-bromine battery - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the "warpage" phenomenon of the current collecting electrode and stress concentration on the interface during tightening, and eliminates characteristic defects such as electrolyte leakage due to the warpage phenomenon It is an object of the present invention to provide a current collecting electrode of a zinc-bromine battery that can improve the performance of the above. [Structure] The collector electrode 7 includes an insulating frame member 16c arranged on both sides of the sheet-shaped insulating frame member 16b located in the center of the stacking direction in the stacking direction, and an insulating frame member located in the center of the hole 17. A plurality of carbon plastic electrodes 15a arranged on both sides in the stacking direction of 16b, a current collecting mesh 6 arranged in the carbon plastic electrode on one side, and a current collecting mesh 6 in the carbon plastic electrode on the other side
And a dummy mesh 19 disposed at a symmetrical position, and each insulating frame member 16b, 16c, the carbon plastic electrode 15a, the current collecting mesh 6 and the dummy mesh 19 are integrally molded by a heat press means. It has a structure of an electric electrode.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a collecting electrode which is a constituent member of an electrolyte circulating type laminated secondary battery, particularly a zinc-bromine battery.

[0002]

[Prior art]

 Zinc-bromine batteries are secondary batteries that use bromine as the positive electrode active material and zinc as the negative electrode active material. For example, this battery is used at night when power demand is low to solve the imbalance between day and night. It is used to store electricity and discharge it in the daytime.

Bromine generated on the positive electrode side at the time of charging reacts with the bromine complexing agent added to the electrolytic solution to be returned as an oily precipitate to the storage tank, and at the time of discharging it is pumped into the unit cell. It is sent and returned. The components of the electrolytic solution are a ZnBr ₂ aqueous solution, a salt such as NH ₄ Cl for reducing the resistance, and Pb, Sn, and quaternary ammonium salts for preventing dendrite on the negative electrode zinc side and promoting uniform electrodeposition. , With a bromine complexing agent. A separator is inserted between the positive electrode and the negative electrode to prevent self-discharge due to the bromine generated in the positive electrode diffusing into the negative electrode and reacting with zinc.

This zinc-bromine battery mainly has a bipolar type electrode, a battery body in which a plurality of cells (cells) are electrically stacked in series, an electrolytic solution storage tank, and an electrolytic solution storage tank between them. It consists of a pump and a piping system that circulates the electrolyte.

FIG. 6 is an exploded perspective view showing an example of a battery main body that constitutes the above zinc-bromine battery. An insulating frame 1b is arranged on the outer periphery of an electrode portion 1a of a bipolar plate-shaped intermediate electrode 1 having a rectangular flat plate shape. Similarly, in the separator plate 2 having a rectangular flat plate shape, the frame body 2 a is formed on the outer periphery of the separator 3. The separator plate 2 and, if necessary, the packing 4 and the spacer mesh 5 are stacked on the intermediate electrode 1 to form a single cell, and a plurality of the single cells are laminated to form a battery body.

A collector electrode 7 having a collector mesh 6, a pair of tightening end plates 8 and a stacking end plate 9 for pressing, which is located inside the collector electrodes 7, are provided at both ends of the stacked battery bodies. It is arranged. Then, a bolt (not shown) is passed between both the tightening end plates 8 and 8 to fasten the bolt to form a battery body integrally laminated and fixed.

In each unit cell of the battery main body configured as described above, the positive electrode manifold 10 formed at the upper and lower two corners of the frame 2 a of each intermediate electrode 1 and the separator plate 2, The electrolyte solution flows in and out from the negative electrode manifold 11 through the channels 12 and the microchannels 13 provided in the frame body 2a of the separator plate 2, respectively.

It has been confirmed that the zinc-bromine battery configured as described above has a battery efficiency of about 80% and a total energy efficiency of about 70% in a 50 KW class battery.

On the other hand, as shown in FIG. 7, the current collecting electrode 7 has a carbon plastic electrode 15 and a brass current collecting mesh 6 which are placed in a hole 16d of the insulating frame member 16 and overlap each other. It is integrally manufactured based on the heat pressing means under the conditions of temperature and pressure. Reference numeral 6a denotes a terminal piece for extracting electric power led out from the current collecting mesh 6, and the terminal piece 6a is taken out to the outside through a slit 16a formed in the insulating frame member 16.

Usually, in order to manufacture the above-mentioned current collecting electrode 7, as shown in FIG. 8, the same insulating frame material 16b is formed on the laminated sheet-like insulating frame materials 16b, 16b having a thickness of about 1 mm. A plurality of insulating frame members 16c, 16c each having a thick hole 17 with a frame-shaped hollow are stacked, and a carbon plastic electrode 15a having a thickness of about 1 mm, a brass current collecting mesh 6 and The carbon plastic electrode 15b having a thickness of about 1 mm is sequentially assembled in a sandwich shape, and is integrally manufactured based on a heat pressing means under a predetermined temperature and pressure condition using a die not shown. At the time of assembling to the battery body, the terminal piece 6a for taking out the electric power derived from the current collecting mesh 6 is led out to the outside through the inside of the carbon plastic 15a and the insulating frame member 16b, and is connected to the current collecting bus bar (not shown). It is connected. The arrow a in FIG. 8 indicates the liquid contact side, and the arrow b indicates the back side.

In the case of such a collector electrode 7, there may be a difference in thermal contraction rate due to a difference in material between the liquid contact side a and the back surface side b with respect to the electrolytic solution, and due to this difference in thermal contraction rate. There is a fear that the flatness of the collector electrode may be deteriorated. In order to deal with this, the applicant of the present application has previously proposed the structure of the collecting electrode shown in FIG. 9 in Japanese Patent Application No. 4-51450.

That is, in the example of FIG. 9, a hole portion 18 is formed in a substantially central portion of a sheet-like insulating frame member 16b having a thickness of about 1 mm, which is located at the center in the stacking direction, and both sides of the insulating frame member 16b in the stacking direction are formed. Then, a plurality of sheet-like insulating frame members 16c 1 and 16c each having a thickness of about 1 mm, in which the hole portions 17 and 17 are hollowed out, are arranged, and both sides in the stacking direction inside the hole portion 17 and centered on the insulating frame member 16b. , A plurality of carbon plastic electrodes 15a, 15a formed to have a thickness of about 1 mm and a brass current collecting mesh 6 are arranged and integrated based on a heat pressing means under a predetermined temperature and pressure condition. There is. The terminal piece 6a for extracting electric power, which is led out from the current collecting mesh 6, is led out outward through each carbon plastic 15a and the insulating frame member 16b, and is connected to a current collecting bus bar (not shown).

In the example of FIG. 9, the carbon plastic electrodes 15a, 15a are arranged substantially symmetrically in the stacking direction with the insulating frame member 16b as the center in the stacking direction, so The main point is to prevent a difference in heat shrinkage rate due to a difference in material from the back side b.

[0014]

[Problems to be solved by the device]

 However, in the current collecting electrode 7 used in such a conventional zinc-bromine battery, for example, in the examples shown in FIGS. 7 and 8, as described above, the contact side a and the back side b with respect to the electrolyte are It is unavoidable that there is a difference in the thermal contraction rate due to the difference in the material, and especially when the temperature decreases, the difference in the thermal contraction rate may reduce the flatness of the collector electrode itself.

When the flatness of the current collecting electrode is lowered, when a bolt is tightened by passing bolts between the tightening end plates 8 and 8 constituting the battery main body as described in FIG. Leakage is likely to occur, which causes a problem that the stored electric power is lost. If the tightening force of the bolt is increased in order to eliminate this liquid leakage, there is a problem that the stress concentrated at the interface causes breakage such as cracking. In particular, when the current collecting electrode 7 having reduced planarity is incorporated into the battery body, the current collecting electrode 7 is distorted, and thermal stress at the time of charging / discharging also causes deformation at the interface.

On the other hand, as shown in FIG. 9, by arranging the carbon plastic electrodes 15a, 15a substantially symmetrically in the stacking direction, it is possible to minimize the reduction in the flatness due to the difference in the thermal contraction rate. However, according to actual measurement, it has been observed that a "warpage" of about 5 mm occurs in the insulating frame member 16b located at the center in the thickness direction. The reason is that the current collecting mesh 6 exists only in the liquid contact side a direction with respect to the insulating frame member 16b, and the current collecting mesh 6 does not exist in the back surface side b direction. Conceivable.

The present invention has been made in view of the above points, and prevents the "warpage" phenomenon of the current collecting electrode and the stress concentration on the interface portion during tightening, and the electrolyte solution caused by the above warpage phenomenon is prevented. It is an object of the present invention to provide a current collecting electrode for a zinc-bromine battery, which can improve the performance of the battery by eliminating the cause of inferior characteristics such as liquid leakage.

[0018]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention forms a single cell by stacking a separator plate on a rectangular flat plate-shaped intermediate electrode, and stacks a plurality of the single cells to form a battery main body. A zinc-bromine battery current collector electrode in which a pair of current collector electrodes and a tightening end plate are placed at both ends, and the two tightening end plates are bolted together to integrally fix them in layers As claimed in claim 1, an insulating frame member arranged on both sides in the stacking direction of a sheet-shaped insulating frame member positioned in the center of the stacking direction and having hollow holes formed therein, and an insulating frame positioned in the hole and at the center. Multiple carbon plastic electrodes placed on both sides in the stacking direction of the material, the current collecting mesh placed inside the carbon plastic electrode on one side, and within the carbon plastic electrode on the other side and symmetrical with the above current collecting mesh. Typical Made by and a dummy mesh disposed in location, each insulating frame material, carbon plastic electrode, are the construction of the collecting electrode which is integrally formed by a current collector mesh and the dummy mesh and the Hitopure scan means.

Further, according to claim 2, the carbon is formed inside the insulating frame material having a predetermined thickness and has the same thickness as that of the insulating frame material, and the current collecting mesh is arranged at the central portion in the stacking direction. The present invention provides a structure of a current collecting electrode, which is formed by including a plastic electrode, and in which the insulating frame member, the carbon plastic electrode, and the current collecting mesh are integrally molded by heat pressing means.

Further, according to claim 3, a carbon plastic electrode in which a current collecting mesh is arranged in a substantially central portion within a hole formed in an insulating frame material having a predetermined thickness, and the current collecting mesh It comprises a stainless mesh inserted inside an insulating frame material at symmetrical positions in the stacking direction, and the insulating frame material and the carbon plastic electrode, current collecting mesh and stainless mesh are heat pressed. Provided is a structure of a collecting electrode of a zinc-bromine battery integrally molded by means.

[0021]

[Action]

 According to the current collecting electrode of the first aspect, since the current collecting mesh and the dummy mesh are symmetrically arranged on both sides of the insulating frame material located at the center of the stacking direction, the current collecting mesh and the dummy mesh are caused by the thermal response and the external force. The occurrence of “warpage” of the current collecting electrode is minimized, and the fracture stress characteristic at the interface between each insulating frame material and the carbon plastic electrode is also improved.

Further, according to the current collecting electrode of claim 2, the current collecting mesh is arranged at the center portion in the thickness direction of the carbon plastic electrode integrally molded inside the insulating frame member, which causes the heat stress. The “warpage” prevention effect of the collector electrode is enhanced, and the planarity of the collector electrode can be further improved. In particular, the amount of "warpage" can be reduced to 1/2 or less as compared with the conventional example.

Further, according to the current collecting electrode of claim 3, since the stainless steel mesh is arranged at a position substantially symmetrical to the current collecting mesh in the stacking direction, the current collecting electrode is accompanied by the presence of the stainless steel mesh. In addition to improving the flatness and smoothness of itself and reducing the above-mentioned "warpage" phenomenon, the elasticity of the stainless steel mesh minimizes stress concentration at the interface between the insulating frame material and the carbon plastic electrode. Therefore, it is possible to obtain an effect that the collector electrode is not broken due to an external force.

Since the flatness of each of the current collecting electrodes obtained as described above is maintained very well, it is necessary to increase the tightening force of the bolts between the tightening end plates which are the constituent members of the battery body. Therefore, it is possible to prevent the structural members from being broken due to the tightening stress and to prevent the liquid leakage from the interface of the current collecting electrode.

[0025]

【Example】

 Hereinafter, various embodiments of the current collecting electrode of the zinc-bromine battery according to the present invention will be described in detail with reference to the drawings, the same components as those shown in FIG.

FIG. 1 shows the structure of a current collecting electrode 7 according to the first embodiment of the present invention. Reference numeral 16b in the drawing is a sheet-like insulating frame member having a thickness of about 1 mm, which is located at the center in the stacking direction. In the illustrated example, a hole 18 is formed in the insulating frame member 16b at a substantially central portion thereof.

A plurality of sheet-shaped insulating frame members 16c and 16c having a thickness of about 1 mm are arranged on both sides of the insulating frame member 16b in the stacking direction. The insulating frame members 16c and 16c have holes 17 and 17 formed therein, respectively.

A plurality of carbon plastic electrodes 15a having a thickness of about 1 mm are formed in the holes 17 formed in the insulating frame members 16c, 16c and on both sides in the stacking direction with the insulating frame member 16b as the center. , 15a are arranged.

A brass current collecting mesh 6 is disposed in the carbon plastic electrode 15a on one side, that is, the carbon plastic electrode 15a located on the liquid contact side a in the illustrated example, and the carbon plastic electrode 15a on the other side is further arranged. That is, the dummy mesh 19 is arranged in a position symmetrical to the current collecting mesh 6 in the carbon plastic electrode 15a located on the back side b.

The terminal piece 6 a for extracting electric power, which is derived from the current collecting mesh 6, passes through each carbon plastic electrode 15 a, the insulating frame member 16 b and the dummy mesh 19 and is led out to the outside to collect current. Connected to Busbar. Then, by using a mold (not shown), the insulating frame members 16b and 16c, the carbon plastics 15a and 15a, the current collecting mesh and the dummy mesh 19 are heat-pressed under predetermined temperature and pressure conditions. The current collecting electrode 7 according to the present embodiment is obtained by integrally molding.

That is, in the present embodiment, the carbon plastic electrodes 15a, 15a are arranged substantially symmetrically in the stacking direction with the insulating frame member 16b as the center in the stacking direction, and the terminal piece is disposed in the carbon plastic electrode 15a on one side. The current collecting mesh 6 which can be energized via the 6a is arranged, and the dummy mesh 19 which does not energize is arranged in the carbon plastic electrode 15a on the other side at a position symmetrical to the current collecting mesh 6 in the thickness direction. The arrangement is a structural feature.

According to the current collecting electrode 7, since the current collecting mesh 6 and the dummy mesh 19 are symmetrically arranged on both sides of the insulating frame member 16b located at the center in the stacking direction, thermal stress and external force are applied. The occurrence of "warpage" of the collector electrode due to the above is minimized, and the bending strength (breaking stress) at the interface between the insulating frame members 16c, 16c and the carbon plastic electrodes 15a, 15a is also improved.

Then, when the obtained collecting electrode 7 is laminated on another member constituting the battery main body and tightened and fixed by using a bolt, the carbon plastic electrodes 15a, 15a and the insulating frames 16c, 16c are separated from each other. The watertightness is improved, the sealing property of the electrolytic solution is sufficiently maintained, and the battery performance can be improved.

Next, a second embodiment of the present invention will be described with reference to FIG. In this example, unlike the exploded cross-sectional view of FIG. 1, it is shown as a schematic cross-sectional view of the finally assembled current collecting electrode 7. That is, in the case of the second embodiment, the carbon plastic electrode 15a having the same thickness as the insulating frame member 16b is integrally formed inside the insulating frame member 16b having a predetermined thickness. A brass current collecting mesh 6 is arranged at the center of the carbon plastic electrode 15a in the thickness direction, and a terminal piece 6a for extracting electric power derived from the current collecting mesh 6 passes through the carbon plastic 15a. It is led out to the outside and connected to a current collecting bus bar (not shown). Then, the insulating frame member 16b, the carbon plastic electrode 15a, and the current collecting mesh 6 are integrally molded on the basis of heat pressing means under predetermined temperature and pressure conditions to obtain the current collecting electrode 7 according to the second embodiment. To be

According to the second embodiment, the current collecting mesh 6 is arranged at the center in the thickness direction of the carbon plastic electrode 15a integrally formed inside the insulating frame member 16b. Although the interfacial strength between the insulating frame member 16b and the carbon plastic electrode 15a is slightly reduced (about 10%), the effect of preventing the "warp" of the collector electrode due to thermal stress is higher than that of the first embodiment. It becomes higher, and the flatness of the collector electrode 7 can be further improved.

Here, in order to compare the amount of “warpage” between the current collecting electrodes obtained in the first and second embodiments and the conventional current collecting electrode shown in FIG. 9, a large aluminum plate (about (3 mm thickness), a weight of 50 kg was applied for 24 hours, then left in a free state for 24 hours, and the degree of warpage of these current collecting electrodes 7 was measured at four points up to (1) in FIG. For the measurement, the collecting electrode was placed on the surface plate and the value measured by the hide gauge was used. In addition, 20 and 20 in FIG. 3 are hole portions opened for the manifold.

FIG. 4 is a graph in which the average value (mm) of the “warpage” amount of the conventional example and each of Examples 1 and 2 is plotted against time based on the above measurement results. From FIG. 4, the amount of warpage of the current collecting electrodes of the first and second embodiments of the present invention is sufficiently reduced compared to the amount of “warpage” of the current collecting electrode of the conventional example. It was confirmed that the amount of “warpage” of the collector electrode was reduced to 1/2 or less as compared with the conventional example.

Next, a third embodiment of the present invention will be described with reference to FIG. In the case of this example, the carbon plastic electrode 15a in which the current collecting mesh 6 is arranged substantially in the central portion is provided in the hole portion 16d of the insulating frame member 16b having a predetermined thickness, and the stacking direction with respect to the current collecting mesh 6. It is characterized in that it is provided with a stainless steel mesh 21 inserted inside the insulating frame member 16b in a symmetrical position. The terminal piece 6a for taking out the electric power, which is led out from the current collecting mesh 6, is taken out to the outside by inserting a slit 16a penetrating the insulating frame member 16b and the mesh 21 made of stainless steel into a collecting bus bar (not shown). It is connected.

Then, the insulating frame member 16b, the carbon plastic electrode 15a, the current collecting mesh 6 and the stainless steel mesh 21 are integrally molded on the basis of the heat pressing means under predetermined temperature and pressure conditions, and the third embodiment is made. The collector electrode 7 according to the present invention is obtained.

According to the third embodiment, since the stainless steel mesh 21 is arranged at a position substantially symmetrical to the current collecting mesh 6 in the stacking direction, the stainless steel mesh 21 is a dummy in the first embodiment. In addition to providing the same function as the mesh 19, the flatness and smoothness of the collector electrode 7 itself is enhanced due to the presence of the stainless mesh 21, and the "warpage" phenomenon is reduced. The elasticity of the mesh 21 makes it possible to minimize the concentration of stress on the interface between the insulating frame member 16b and the carbon plastic electrode 15a, and to prevent the current collecting electrode 7 from breaking due to an external force.

As a result of actually measuring the elastic modulus, the elastic modulus of the current collecting electrode 7 in the conventional example (see FIG. 9) was 375 kg / mm ² , whereas that of the current collecting electrode 7 according to the third example. The elastic modulus was 517 kg / mm ² , and it was confirmed that the elastic modulus itself was 1,42 times higher.

[0042]

[Effect of device]

 As described in detail above, according to the current collecting electrode of the zinc-bromine battery described in claim 1, the current collecting mesh and the dummy mesh are symmetrical on both sides of the insulating frame material located at the center in the stacking direction. By arranging in the above, it is possible to minimize the occurrence of “warp” of the collecting electrode due to thermal stress and external force, and improve the fracture stress characteristics at the interface between each insulating frame material and the carbon plastic electrode. .

Further, according to the current collecting electrode of claim 2, the current collecting mesh is arranged at the center portion in the thickness direction of the carbon plastic electrode integrally formed inside the insulating frame member, which causes the thermal stress. The “warpage” prevention effect of the collector electrode is enhanced, and the planarity of the collector electrode can be further improved.

Further, according to the current collecting electrode of claim 3, since the stainless steel mesh is arranged at a position substantially symmetrical to the current collecting mesh in the stacking direction, the current collecting electrode is accompanied by the presence of the stainless steel mesh. In addition to improving the flatness and smoothness of itself and reducing the above-mentioned "warpage" phenomenon, the elasticity of the stainless steel mesh minimizes stress concentration at the interface between the insulating frame material and the carbon plastic electrode. Therefore, it is possible to obtain an effect that the collector electrode is not broken due to an external force.

Since the flatness of each of the current collecting electrodes obtained as described above is maintained extremely well, the tightening force of the bolts between the tightening end plates, which are the constituent members of the battery body, is made particularly strong. Even without it, the liquid tightness can be enhanced, the destruction of the constituent members due to the tightening stress can be prevented, and the battery performance and life can be improved.

[Brief description of drawings]

FIG. 1 is an exploded cross-sectional view for explaining a first embodiment of a current collecting electrode according to the present invention.

FIG. 2 is a cross-sectional view of an essential part for explaining a second embodiment of a collecting electrode according to the present invention.

FIG. 3 is a schematic diagram showing a portion for measuring the amount of warpage of a collecting electrode.

FIG. 4 “Sledding” in a conventional example and the first and second examples.
The graph which shows the result of having measured the quantity.

FIG. 5 is a sectional view of an essential part for explaining a third embodiment of the current collecting electrode according to the present invention.

FIG. 6 is an exploded perspective view of essential parts showing a battery body of a zinc bromine battery.

FIG. 7 is a sectional view of an essential part showing the structure of a conventional collector electrode.

FIG. 8 is an exploded cross-sectional view of an essential part showing the structure of a conventional collector electrode.

FIG. 9 is an exploded cross-sectional view of a main part showing an improved structure of a conventional collector electrode.

[Explanation of symbols]

 6 ... Current collecting mesh 6a ... Terminal piece 7 ... Current collecting electrode 15a ... Carbon plastic electrode 16b, 16c ... Insulating frame material 16d, 17, 18 ... Hole part 19 ... Dummy mesh 21 ... Stainless steel mesh

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuharu Namiki 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Inside the Meidensha Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A rectangular flat plate-shaped intermediate electrode is laminated with a separator plate to form a single cell, and a plurality of the single cells are laminated to form a battery main body, and a pair of collectors are provided at both ends of the battery main body. In the current collecting electrode of the zinc-bromine battery, the current collecting electrode and the tightening end plate are arranged, and the two tightening end plates are bolted together so that they are integrally laminated and fixed. Insulating frame members located in the center of the sheet-shaped insulating frame members on both sides in the stacking direction and having holes hollowed out respectively, and on both sides in the stacking direction of the insulating frame members located in the holes and in the center Multiple carbon plastic electrodes, a current collecting mesh arranged in the carbon plastic electrode on one side, and a dummy mesh arranged in the carbon plastic electrode on the other side and at a position symmetrical to the current collecting mesh. Become comprises a respective insulating frame material, carbon plastic electrode, zinc, characterized in that integrally molded by heat pressing means and the current collector mesh and dummy meshes - bromine battery of the collector electrode. 2. A rectangular flat plate-shaped intermediate electrode is laminated with a separator plate to form a single cell, and a plurality of the single cells are laminated to form a battery main body, and a pair of collectors are provided at both ends of the battery main body. In the current collecting electrode of the zinc-bromine battery, in which the current collecting electrode and the tightening end plate are arranged, and the two tightening end plates are bolted together to be integrally laminated and fixed, the current collecting electrode is a predetermined electrode. The insulating frame member is provided with a carbon plastic electrode inside the insulating frame member having a thickness and having the same thickness as that of the insulating frame member, and having a current collecting mesh arranged at the center in the stacking direction. A current collecting electrode for a zinc-bromine battery, wherein a carbon plastic electrode and a current collecting mesh are integrally molded by a heat pressing means. 3. A rectangular flat plate-shaped intermediate electrode is laminated with a separator plate to form a single cell, and a plurality of the single cells are laminated to form a battery main body, and a pair of collectors are provided at both ends of the battery main body. In the current collecting electrode of the zinc-bromine battery, in which the current collecting electrode and the tightening end plate are arranged, and the two tightening end plates are bolted together to be integrally laminated and fixed, the current collecting electrode is a predetermined electrode. A carbon plastic electrode having a current collecting mesh arranged substantially in the center thereof in a hole formed in an insulating frame material having a thickness, and an insulating frame located symmetrically with respect to the current collecting mesh in the stacking direction. And a stainless steel mesh inserted inside the material, wherein the insulating frame material, the carbon plastic electrode, the current collecting mesh and the stainless steel mesh are integrally molded by a heat press means. - the collector electrode of bromine battery.