JPH0341410Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a diaphragm-type electrolyte flow type assembled battery that is constructed by stacking a plurality of single cells.More specifically, this invention relates to an electrolyte bypass phenomenon or This is to prevent leakage phenomena.

Electricity is easy to convert into various forms of energy, easy to control, and does not pollute the environment when consumed, so its share in energy consumption is increasing every year. A unique feature of electricity supply is that production and consumption occur simultaneously. Within this constraint, the environment for power technology is to reliably transmit high-quality power at a constant frequency and constant voltage while responding quickly to fluctuations in power consumption. In reality, nuclear power generation and new thermal power generation, which are difficult to change output but highly efficient, are operated at the highest efficiency rating possible, and hydroelectric power generation, etc., is suitable for generating electricity in response to fluctuations in constant power consumption. The current situation is that they are meeting the large increase in demand for electricity during the day.

For this reason, pumped storage power generation is used to store surplus electricity generated at night from economical nuclear power generation and cutting-edge thermal power generation, but the location conditions for pumped storage power generation are becoming increasingly difficult.

Under the above-mentioned circumstances, various secondary batteries are being researched as a method for storing electric power, which is a highly versatile energy source that does not pollute the environment, and among these, redox batteries are attracting particular attention.

An outline of this principle will be explained using FIG. 1 and FIG. 2.

FIG. 1 shows the charging state of a power storage system using a redox battery, and FIG. 2 similarly shows the discharging state.

In these figures, 1 is a power plant, 2 is substation equipment, 3 is a load, 4 is an inverter, and 5 is a redox battery, which is composed of tanks 6a, 6b, 7a, 7b, pumps 8, 9, and a flow-through electrolytic cell 10. be done.

The flow-through electrolytic cell 10 includes a positive electrode 11, a negative electrode 12, and a diaphragm 13 that separates the two electrodes.
A positive electrode chamber 14 and a negative electrode chamber 15 partitioned by 3 contain a positive electrode liquid and a negative electrode liquid, and the positive electrode liquid includes, for example,
A hydrochloric acid solution containing Fe ions is used, and a hydrochloric acid solution containing Cr ions, for example, is used as the negative electrode liquid.

In the above configuration, the electric power generated at the power station 1 and transmitted to the substation equipment 2 is transformed to an appropriate voltage and supplied to the load 3.

On the other hand, when surplus power is generated at night, the inverter 4 performs AC/DC conversion and charges the redox battery 5. In this case, as shown in FIG. 1, charging is performed while gradually feeding positive and negative electrolytes from tank 6a to tank 6a and from tank 7a to tank 7a using pumps 8 and 9. Fe ions in the positive electrode liquid, Cr in the negative electrode liquid
When using ions, the reactions that occur in the flow-through electrolytic cell 10 are reactions on the charging side in the following formulas (1) to (3).

Positive electrode side: Fe ³⁺ +e discharge ---→ ← --- Charging Fe ²⁺ ......(1) Negative electrode side: Cr ²⁺ discharge ---→ ← --- Charging Cr ³⁺ +e ......(2) Total reaction: Fe ³⁺ + Cr ²⁺ discharge ---→ ← --- Charge Fe ²⁺ + Cr ³⁺ ...(3) In this way, electric power is accumulated in the positive and negative electrode solutions.

Next, if the supplied power is less than the demanded power, as shown in FIG. 2, from tank 6a to 6b,
While the positive and negative electrode liquids are gradually sent from tank 7b to tank 7b by pumps 8 and 9, discharge is performed by the reaction on the discharge side in equations (1) to (3), and orthogonal conversion is performed by inverter 4, which transforms the substation equipment. Electric power is supplied to the load 3 via 2.

The power storage system using redox batteries is as explained above, but in reality, the above redox flow type batteries are made by connecting multiple cells in series to form an aggregate battery, and then multiple batteries are connected in series. And/or by connecting them in parallel, the required voltage and required capacity can be obtained.

Further, to explain this in detail according to FIG.
A bipolar plate 20 with a frame material 20b made of PVC or the like on the outside, a positive electrode plate 21 with a carbon cloth 21a on the inside and a frame material 21b of PVC or the like on the outside,
a diaphragm plate 22 with an ion exchange membrane 22a provided therein;
It is constructed by laminating negative electrode plates 23 each having a carbon cloth 23a inside and a frame material 23b such as PVC outside.
Stacked 20 to 30 cells of these single cells are assembled into battery A.
form.

In this case, holes 24 provided in the frame materials of the bipolar plate 20, the positive electrode plate 21, the diaphragm type 22, and the negative electrode plate 23
..., holes 25..., holes 26..., holes 27... are pores that are stacked to form a negative electrode liquid supply pipe 24A, a negative electrode liquid supply pipe 25A, a positive electrode liquid discharge pipe 26A, and a negative electrode liquid discharge pipe 27A, respectively.

Positive electrode liquid supply pipe 24A and negative electrode liquid supply pipe 25
The positive electrode liquid and the negative electrode liquid are supplied to A from a main pipe provided outside, and the positive electrode liquid is supplied to the positive electrode chamber 14 through the vertical groove 24a that communicates with the hole 24 of the positive electrode plate 21 and the inside, and the positive electrode liquid is supplied to the positive electrode chamber 14. The positive electrode liquid is discharged through a vertical groove 26a that communicates the inside of the hole 26 with the positive electrode liquid discharge pipe 26A, and further discharged from this to a main pipe provided outside.

The negative electrode liquid is supplied to the negative electrode chamber 15 through the vertical groove 25a that communicates between the hole 25 of the negative electrode plate 23 and the inside thereof, and the vertical groove 2 that communicates the inside of the negative electrode plate 23 with the hole 27.
7a, it is discharged to the negative electrode liquid discharge pipe 27A, and further discharged to the main pipe provided outside.

As described above, the positive electrode liquid and the negative electrode liquid flow in the assembled battery A formed by stacking unit cells.

However, the assembled battery A, which is constructed by stacking these single cells, conventionally has mounting plates 28, 28 on both sides.
At least four bolt insertion holes 29 are provided in the peripheral edges of the mounting plates 28, 28, and a fixing method is adopted in which bolts 30 are passed through the bolt insertion holes 29 and tightened with nuts 31 from the outside of the mounting plates 28. However, with this method, if the bolts 30 and nuts 31 are insufficiently tightened, the holes 24..., 25
. . , 26 . . . , 27 . . . are stacked to form supply pipes 24A, 25A and discharge pipes 26A, 27A, which create gaps, causing leakage or bypass phenomena of the positive and negative electrode liquids.

Furthermore, if the bolts 30 and nuts 31 are tightened too tightly, the tightening force of the bolts 30 and nuts 31 is too biased toward the periphery of the battery pack A, causing electrolyte leakage or a bypass phenomenon as described above.

In view of the above-mentioned circumstances, the purpose of this invention is to effectively prevent electrolyte leakage or bypass phenomenon in a diaphragm-type electrolyte flow type assembled battery constructed by stacking a plurality of single cells. The feature is that mounting plates are provided on both sides of the battery pack through pressing parts that press the central part of the sides of the battery pack.

Hereinafter, this invention will be explained based on the illustrated embodiment. Fig. 6 shows an example in which this invention is applied to the assembled battery shown in Figs. 4 and 5. The same reference numerals are used for the configurations to be used, and the explanation thereof will be omitted.

In FIG. 6, mounting plates 28, 28, which are slightly larger than the sides of the assembled battery A, are installed on both sides of the diaphragm type electrolyte flow type assembled battery A, which is constructed by stacking a plurality of single cells as described above. A plate-shaped pressing portion 32, which is smaller than the battery pack A and larger than the space of the frame member 23b, that is, the positive electrode chamber 14 or the negative electrode chamber 15, is interposed between the side surface of the battery pack A and the mounting plate 28. Further, bolt insertion holes 2 are provided on the periphery of the mounting plate 28.
9... is formed, and the bolt 3 is inserted into the bolt insertion hole 29...
0... from the outside of the bolt 30...
... and tighten between the mounting plates 28, 28.

In this way, since the pressing part 32 is interposed between the mounting plate 28 and the side surface of the assembled battery A,
The tightening force of the bolt 30 and nut 31 is applied to the pressing part 3.
2 to the center of the side of the battery pack A, especially the pressing part 3
The assembled battery A is fixed by the tightening force transmitted to the center of both sides.

Therefore, according to this invention, a fastening force is reliably applied to the holes in the battery pack A, and therefore gaps are created between the electrolyte supply pipes 24A, 25A and the discharge pipes 26A, 27 formed inside. Therefore, electrolyte leakage and bypass phenomena can be effectively prevented.

In addition, in the above embodiment, the pressing part 32 is attached to the mounting plate 2.
Although the bolts 30 and nuts 31 are used as fastening means between the mounting plates 28 and 28 in this embodiment, they may be formed separately from the mounting plates 28. It is not limited.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams explaining the operating principle of a redox battery, Figure 3 is a perspective view showing an example of the structure of a unit cell in a redox battery, and Figure 4 is an assembly constructed by stacking the same unit cells. FIG. 5 is a front view of the same, and FIG. 6 is a side view of an embodiment of this invention. In the figure, A is an assembled battery, 28, 28 are mounting plates, 3
2 is a pressing part.

Claims (1)

[Scope of utility model registration request] A plurality of cells having holes through which positive and negative electrode liquids pass are stacked on the frame material of the cell in which a positive electrode chamber or a negative electrode chamber is formed, and the stacked holes are connected to the positive electrode liquid, negative electrode liquid supply piping, and positive electrode. In a diaphragm-type electrolyte flow type assembled battery that constitutes liquid and negative electrode liquid discharge piping, the stacked cells are removed by a mounting plate through a plate-shaped pressing part that is smaller than the assembled battery and larger than the positive electrode chamber or the negative electrode chamber. A diaphragm type electrolyte flow type assembled battery characterized by the batteries being fastened from both sides.