JPH0648756Y2 - Collection electrode of laminated battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a collecting electrode used as both end electrodes of a laminated battery.

B. Outline of the Invention In the present invention, in a collector electrode used as an electrode at both ends of a laminated structure battery, a frame plate is formed around a carbon plastic electrode in which a collector mesh is embedded, and the collector plate is integrated with the collector mesh. By constructing a long fold-like terminal piece from the middle part of the carbon plastic electrode, the structure is simplified, cracks are not generated by external stress, and its performance is improved. is there.

C. Conventional Technology Recently, the development of fuel cells and battery power storage systems has been promoted, and as a part of these developments, electrolyte circulation type zinc-bromine laminated secondary batteries such as those shown in FIGS. 4 to 7 have been developed. Being developed.

As shown in the structural principle diagram of FIG.
Is divided into a positive electrode chamber 3 and a negative electrode chamber 4 by a separator 2 composed of an ion exchange membrane or a porous membrane, and liquid feed pipes 5 and 6 and liquid return pipes 7 and 8 for circulating an electrolytic solution in the positive and negative electrode chambers 3 and 4, respectively. Zinc bromide (ZnB
The electrolyte solution of r ₂ ) is circulated in each electrode chamber. In addition, 11 is a positive electrode, 12 is a negative electrode, 13 and 14 are both liquid feed pumps, and 15 is a valve.

Then, during charging, the electrolyte circulates in the direction of the arrow in the figure, Zn ⁺⁺ ＋ 2e ⁻ → Zn for the negative electrode 12 and 2Br ⁻ → Br ² + for the positive electrode 11.
The bromine generated in the positive electrode 11 due to the reaction of 2e becomes a molecule, mixes in the electrolytic solution, partially dissolves, and mostly becomes a complex by the complexing agent in the positive electrode solution, and the electrolytic solution tank on the positive electrode chamber side Accumulates within 10 and accumulates. During discharge, the electrolyte 11 circulates in each electrode 11 and 12 in the state of being circulated, and a reaction opposite to the above reaction occurs, and the precipitate (Zn, Br ₂ ) is consumed (oxidation, reduction) on each electrode 11 and 12. ), The electrical energy is released.

Further, in the zinc-bromine battery having the above-described construction principle, a stack battery having a large number of cell stack structures is used as a stacked battery as illustrated in FIG. This is a pair of tightening end plates 16 and 16 for pressing the entire stack from both ends so as to be sandwiched by using bolts and nuts, and laminated end plates 17 and 17 that are pressing members arranged inside each of them. For example, 30 cells are laminated in between. That is, the current collecting mesh of one of the carbon plastic current collecting electrodes 18
Next to 19, the separator plate 21 is overlaid via the packing 20, the spacer mesh 22 for holding a predetermined distance is overlaid, the carbon plastic flat plate intermediate electrode 23 is overlaid, and the packing 20
Are laminated in such an order as to be stacked, and finally the other carbon plastic current collecting electrode 18 is laminated so that a total of 30 cells are laminated.

In the stack configured in this way, the positive electrode manifold 24 and the negative electrode manifold 25, which are liquid flow holes at the four corners, are formed.
And.

Further, each separator plate 21 is formed by integrally molding a frame plate 21a around the separator 2 made of a microporous film, and microchannels 26 are symmetrically arranged on the upper and lower sides of both plane parts thereof. Consists of The micro-channels 26 shown by the solid lines on one side of the separator uniformly spread the electrolytic solution introduced from the diagonal positive electrode manifolds 24 and flow it over the entire surface of the separator 2, or collect the solution. The microchannel 26 shown by the broken line on the other side is for introducing and collecting the electrolytic solution from the negative electrode manifold 25.

In this way, between the electrodes respectively arranged on both side surfaces of each separator plate 21, a cell which is the unit battery illustrated in FIG. 4 is constituted, and 30 cells are connected in series as a stack. It is configured to.

Then, in this stack, as shown in FIG. 6, bus bars 27, which are conductors, are fastened to the free ends of the collecting mesh 19 extending from both sides of the collecting electrode 18 with mounting screws 28, Electricity is charged and discharged through the bus bar 27.

The collector electrode 18 used in this way is, as shown in FIG.
A carbon plastic plate material 30 having a thickness of about 3 mm is placed on a polyethylene sheet 29, a current collecting mesh 19 which is a brass mesh is placed on the carbon plastic plate material 30, and the carbon plastic plate material 30 is placed thereon.

Furthermore, the carbon mesh plate material 30 of the current collecting mesh 19
The parts extending horizontally on both sides are sandwiched between two strip-shaped polyethylene sheet materials 31, respectively, and placed on the polyethylene sheet 29 so as to be along the same direction.
A sheet of polyethylene sheet material 31 is placed on the polyethylene sheet 29 along the both sides of the carbon plastic plate material 30 where the current collecting mesh 19 is not present, and the whole is heat-pressed to form a strip-shaped polyethylene sheet material. 31 is a frame plate
18a was integrally molded, and the carbon plastic plate material 30 and the current collecting mesh 19 were in close contact with each other to form the current collecting electrode 18.

D. Problems to be Solved by the Invention In the conventional collecting electrode as described above, the bus bars 27 are extended to both lateral side portions of the collecting electrode 18 and the lateral extending ends of the collecting mesh 19, respectively. There was a problem in that it had to be connected, which was troublesome, and the structure was complicated and inconvenient to use.

In view of the above points, the present invention has an object to newly provide a collector electrode for a laminated battery, which has a simple structure as the entire end plate electrode and is easy to manufacture.

E. Means for Solving the Problems The current collecting electrode of the laminated battery of the present invention is composed of a carbon plastic electrode in which a current collecting mesh is embedded, a frame plate integrally provided around the carbon plastic electrode, and a carbon part from the middle part of the current collecting mesh. It is characterized in that it is provided with a terminal piece integrally drawn out to the outside of the plastic electrode.

F. Operation With the above-mentioned configuration, the terminal piece can collect current well without concentrating current on one portion of the current collecting mesh. Further, the current collecting mesh and the terminal piece are flexibly deformed integrally with the electrode plate, so that the electrode plate is prevented from being cracked.

G. Example Hereinafter, one example of the collecting electrode of the laminated battery of the present invention will be described with reference to FIGS. It should be noted that, in FIGS. 1 to 3, components corresponding to those in FIGS. 4 to 7 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is an overall perspective view, and 18 is a body of a collecting electrode.

The collector electrode 18 is configured as follows. That is, as shown in FIG. 3, a current collecting mesh 33 is overlaid on a rectangular flat carbon plastic plate 32. The current collecting mesh 33 is formed by forming a brass mesh material having a conductivity close to that of copper into a size substantially equal to that of the carbon plastic plate 32 described above, and at a predetermined position in an intermediate portion thereof, in a rectangular folded piece shape. The protruding terminal piece 34 is integrally provided.

And the current collecting mesh divided into two by this terminal piece 34
Corresponding small rectangular flat plate-shaped carbon plastic small plates 35 and 36 are stacked on the respective flat surface portions of 33.

Next, the stacked carbon plastic plate 32, the collecting mesh 33 and the carbon plastic small plates 35, 36 are
The whole is solidified by heat pressing.

After that, put the solidified one into the mold of the injection molding machine,
As shown in FIG. 1, the frame plate 18a is integrally formed around the periphery thereof by the insert molding method.

By forming the manifold through holes and other irregularities in the molding die of the frame plate 18a of this injection molding machine in advance, the subsequent processing work becomes unnecessary and the manufacturing efficiency can be improved. Is.

With this configuration, as shown in FIGS. 1 and 2, the terminal piece 34 laterally and widely projects from the side surface of the collector electrode 18. That is, the terminal piece 34 having a large power extraction area is connected to the external conducting wire.

H. Effect of the Invention As described in detail above, according to the current collecting electrode of the laminated battery of the present invention, the frame plate is provided around the carbon plastic electrode in which the current collecting mesh is embedded, and from the middle part of the current collecting mesh. Since the terminal piece is integrally drawn out to the outside of the carbon plastic electrode, the terminal holes arranged so as to cross the middle part of the current collecting mesh can collect current evenly without concentrating the current in one place. There is.

Furthermore, the current collecting mesh is wrapped inside the carbon plastic plate and the frame plate, and the electrolyte solution or the like outside does not come into contact with the current collecting mesh. This has the effect of preventing corrosion of the mesh.

Further, both the current collecting mesh and the terminal piece have a mesh structure and are flexible, so that they expand and contract with the current collecting electrode in response to external stress generated in the current collecting electrode formed integrally with the current collecting electrode. There is an effect that it is possible to prevent the current collecting electrode from being cracked due to the difference in expansion / contraction ratio. At the same time, since the current collecting mesh and the terminal piece are integrally structured, contact resistance at that portion can be eliminated, heat generation inside the electrode can be prevented, and concentrated heat conduction at this portion can be avoided, resulting in local thermal expansion and Since the heat shrinkage can be relaxed, there is an effect that the warp of the current collecting electrode can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a collecting electrode of a laminated battery of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an exploded perspective view of a main portion thereof, and FIG. 4 is a conventional battery. A schematic explanatory diagram showing the principle, FIG. 5 is an exploded perspective view of a stack portion which is an element of the battery, FIG. 6 is a perspective view showing an essential part of a laminated cell of the stack, and FIG. 7 is an essential part thereof. It is an exploded perspective view. 1 ... Battery main body, 18 ... Current collecting electrode, 18a ... Frame plate, 32 ... Carbon plastic plate, 33 ... Current collecting mesh, 34 ... Terminal piece, 3
5,36… Carbon plastic small plate.

Claims (1)

[Scope of utility model registration request] 1. A current collecting electrode of a laminated battery in which a large number of battery constituent members are laminated and arranged at both ends thereof to collect current, wherein the current collecting electrode has a current collecting mesh embedded therein. A carbon plastic plate, a frame plate integrally formed around the carbon plastic plate, and a long folded piece integrated with the current collecting mesh, which extends from an intermediate portion of the current collecting mesh to an outer surface of the carbon plastic plate. A collector electrode for a laminated battery, characterized in that the collector electrode has a strip-shaped terminal piece.