JPH0648757Y2 - Electrolyte circulation type laminated battery device - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a laminated battery device which prevents leakage of circulating electrolyte.

B. Outline of the Invention The present invention is a laminated battery in which an electrolytic solution is circulated and used, and a battery laminated body formed by integrally laminating battery constituent members such as electrode plates is filled with compressed gas at a predetermined pressure. By containing and sealing in the storage container, even if the laminated portion of the battery laminate is deformed during many years of use, leakage of the electrolytic solution is prevented.

C. Conventional technology Recently, the development of battery power storage system has been promoted,
As a part of this, an electrolyte circulating zinc-bromine stacked secondary battery as illustrated in FIGS. 2 and 3 has been 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 electrode chamber 3 and the negative electrode chamber 4, respectively. The electrolytic solution tanks 9 and 10 connected by the
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.
+ 2e reaction occurs, and the bromine generated in the positive electrode 11 becomes a molecule, mixes in the electrolytic solution, partially dissolves, and most of it becomes a complexed product 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.

A battery stack having a large number of cell stack structures (hereinafter referred to as a stack in the present specification) as illustrated in FIG. 3 is used for the zinc-bromine battery having the above-described configuration principle. This consists of a pair of tightening end plates 16 and 16 for inserting the entire stack between both ends and holding them with bolts and nuts that are screwed together, and a holding member arranged inside each of them. Between the laminated end plates 17, 17, for example, 30
It is configured by stacking cells. That is, the packing mesh is provided next to the collecting mesh 19 of the end plate electrode 18 of one carbon plastic.
The separator plates 21 are stacked with the spacers 20 interposed therebetween, the spacer mesh 22 for holding a predetermined distance is stacked, the flat plate intermediate electrodes 23 made of carbon plastic are stacked, and further the packing 20 is stacked. The end plate electrodes 18 are overlapped, and a total of 30 cells are laminated.

Next, the bolts 28 are respectively inserted into the through holes 27 formed at predetermined positions in the vicinity of the periphery of each tightening end plate 16, and the nuts are inserted.
29 is screwed together, the whole stack is sandwiched, and it is tightened so as not to leak liquid.

As shown in FIG. 3, the stack thus laminated has a positive electrode manifold 24 having flow holes at its four corners.
And a negative electrode manifold 25.

Each separator plate 21 is formed by integrally molding a frame body 21a that also functions as a packing around the separator 2 made of a microporous film. Channel 26 is installed. The microchannel 26 shown in this one-sided experiment is
The electrolytic solution introduced from each of the diagonal positive electrode manifolds 24 is uniformly spread and flowed over the entire surface of the separator 2, or the solution is recovered from this. 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 arranged on both side surfaces of each separator plate 21, the unit battery cell illustrated in FIG. 2 is constructed, and 30 cells are connected in series as a stack. It is configured to.

D. Problems to be Solved by the Invention In a conventional battery stack, that is, a stack as a battery main body as described above, when used for a long period of time, the frame plate portion of each cell, which is the internal stack, may be There have been problems such as creep deformation, deterioration due to electrolyte and temperature, weakening of waterproof function, leakage of electrolyte, and leakage of electricity.

In addition, it is desirable to perform regular maintenance as a measure against electrolyte leakage as described above, but it is difficult to detect leakage with large-sized batteries for electric power, and its work is also dangerous. Therefore, there is a problem that it is difficult to perform maintenance.

The present invention has been made in view of the above points, and an object of the present invention is to newly provide an electrolytic solution circulation type laminated battery device in which the electrolytic solution is prevented from leaking from the battery laminated body.

E. Means for Solving the Problems The electrolytic solution circulating type laminated battery device of the present invention is configured such that an electrode stack and other battery constituent members are integrally laminated, and the entire battery stack is housed and sealed in a housing container. It is characterized in that it is filled with compressed air so as to be maintained at a predetermined pressure.

F. Action With the above-described configuration, when the battery is used for a long period of time, the frame of the battery component such as the electrode plate of the battery stack is deformed or cracked to form a gap. In this case, the compressed air prevents the electrolyte solution from leaking through the gap, and thus has the effect of preventing the leakage.

G. Example An example of the electrolytic solution circulating type laminated battery device of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those of the conventional example shown in FIGS. 2 and 3 are given the same reference numerals, and detailed description thereof will be omitted.

1 is a battery main body, 5 and 6 are liquid sending pipes, 7 and 8 are liquid returning pipes, 9 and 10 are electrolyte tanks, and 13 and 14 are liquid sending pumps.

Separator plate 21 and intermediate electrode 23 constituting the battery body 1
A battery stack, that is, a stack 30 formed by integrally stacking etc.
The whole is stored in the storage container 31.

The storage container 31 can keep airtightness and can increase the internal air pressure. Further, a ventilation pipe 32 is installed in the storage container 31, compressed air is filled into the storage container 31 from a pressure pump (not shown) connected to the ventilation pipe 32, and a cock (not shown) is closed to close the internal pressure of the storage container 31. Can be held at a predetermined value.

An appropriate pressure is applied to the pressure value in the storage container 31 according to conditions such as the size of the battery. That is, as shown in the table below.

Further, a pressure gauge 33 for measuring and displaying the internal atmospheric pressure is installed in a part of the storage container 31.

In the device of the present example configured as described above, in the stack 30 in the storage container 31 filled with compressed air, the circulation of the electrolytic solution in the stack 30 causes the pressure to be lower than the pressure considering the pressure loss of the internal fluid circuit. Subject to high predetermined pressure. Therefore, while the battery is in operation for a long period of time, the electrolyte solution is prevented from leaking from the gap generated by the deformation of the frame body of the stack plate 30 that is a laminated component of the stack 30 and the intermediate electrodes 23 that are pressed against each other. it can.

Further, even if the stack 30 has a factor that causes liquid leakage of the electrolyte, the pressure leakage of the compressed air in the storage container 31 can prevent the liquid leakage.

Further, since the pressure in the electrolytic solution tanks 9 and 10 of this battery is approximately equal to the external atmospheric pressure, when a gap or a crack is generated in the stack 30 in the storage container 31 filled with air of the predetermined pressure,
Compressed air enters the stack 30 through this gap and escapes from the electrolytic solution tanks 9 and 10. This allows the storage container
Since the air pressure inside 31 decreases and this can be detected by the display of the pressure gauge 33, the presence or absence of liquid leakage can be judged by controlling the value of the pressure gauge. When liquid leakage occurs in this way, repair and maintenance can be performed immediately, the time and effort of repeating inspections can be omitted, and the time for maintenance can be easily determined.

Further, even if the electrolytic solution leaks from the stack 30, it is received by the storage container, so that it is possible to effectively prevent the leakage of the electrolytic solution and the occurrence of a short circuit accident due to the leaked electrolytic solution.

H. Effect of the Invention As described above in detail, according to the electrolytic solution circulating type laminated battery device of the present invention, the battery laminated body formed by integrally laminating the battery component members such as the electrode plate is housed and sealed in the container. Since the storage container is filled with compressed air and kept at a predetermined pressure, the electrode plate of the battery stack and its frame may be deformed or cracked while the battery is used for a long period of time. In the case where a gap is created due to the compressed air, the compressed air prevents the electrolytic solution from leaking from the gap, so that there is an effect that the leakage can be prevented.

Furthermore, there is an effect that the factor of liquid leakage can be controlled by the pressure of the compressed air.

Further, even if a liquid leak occurs from the battery stack, it can be received by the storage container and prevented from leaking to the outside, so that there is an effect that an accident such as a leak or a short circuit can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional schematic perspective view showing an embodiment of the electrolytic solution circulation type laminated battery device of the present invention, FIG. 2 is a schematic explanatory diagram of the principle of a conventional zinc-bromine battery, and FIG. It is an expansion disassembled perspective view of the battery main body part which is a part. 1 ... Battery main body, 21 ... Separator plate, 23 ... Intermediate electrode, 31 ...
Storage container, 32 ... Ventilation pipe, 33 ... Pressure gauge.

Claims (1)

[Scope of utility model registration request] 1. A battery laminated body is formed by stacking a plurality of members, each having a frame plate formed around a battery constituent material plate such as an electrode, by joining the frame plate parts together, and liquid feeding through the frame plate. To form a groove-shaped microchannel that communicates from the manifold that is a hole to the electrolytic cell that is a chamber formed in the electrode part,
In an electrolytic solution circulation type laminated battery configured to circulate an electrolytic solution in the electrolytic cell through the above, an electrolytic solution in which the battery laminated body is housed in a storage container and is circulated in the battery laminated body in the storage container. An electrolytic solution circulating type laminated battery device, characterized by being filled and sealed with a gas having a predetermined pressure, which is higher than the pressure of the liquid.