JPH07192776A - Zinc-bromine battery - Google Patents

Abstract

PURPOSE:To reduce futile space and improve the volume energy density and also, reduce the number of parts of a device by using a spring in place of a conventional disc spring and besides, interposing this spring at the intermediate position between end plates on both sides. CONSTITUTION:30 cell stacks 20a-20c, end plate electrodes 4, and PVC end plates 30a and 30b are stacked horizontally, with the length of their sides trued up. PVC end plates 31 a and 31b and FRP end plates 32a and 32b longer than the length of each side of this stack are arranged at both ends of this stack. Holes 33 are bored at four corners of the PVC end plates 31 a and 31b and FRP end plates 32a and 32b. Spring parts 34a-34d having springs within are arranged at the section which connects the opposite fellow holes of the VPC end plates 31 a and 31b. Bolts 35a-35d are screwed in each hole 33... of the PVC end plate and the FRP end plate. A battery is constituted by tightening the bolts 35a-35d through the spring parts 34a-34d.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to the construction of stacked battery bodies for zinc-bromine batteries.

[0002]

2. Description of the Related Art A zinc-bromine battery is an aqueous secondary battery that uses zinc for the negative electrode and bromine for the positive electrode as an active material.
Unlike a lead battery, this battery employs an electrolytic solution circulation system to store the active material externally as shown in FIG. That is, a battery main body, an electrolytic solution storage tank, and a piping system that circulates an electrolytic solution between them, and a single cell of stacked batteries is partitioned by a separator to form a positive electrode chamber and a negative electrode chamber, and a positive electrode chamber. A positive electrode electrolyte solution is circulated from the positive electrode solution storage tank by a pump, and a negative electrode electrolyte solution is circulated from the negative electrode solution storage tank by a pump to the negative electrode chamber.

One sub-module of a zinc-bromine battery is composed of 30 × 3 = 90 cells as a basic unit.
The inside of the 0 cell is configured as shown in FIG. In FIG. 4, 1 is a framed separator in which an insulating (plastic or the like) frame is integrally formed on the outer periphery of the separator, and 2 is a bipolar in which the insulating frame is integrally formed on the outer periphery of a conductive member (electrode). It is an intermediate electrode with a frame. A spacer 3 is stacked on both sides of the framed intermediate electrode 2 with the framed separator 1 sandwiched therebetween to form a single cell, and 30 single cells are laminated, and finally, the end plate electrode 4 and the end plate electrode 4 are formed on both sides. Overlap the tightening end plate 5,
The bolt 6 and the nut 7 are tightened to form an integral unit. In the figure, 8 is a positive electrode manifold, 9 is a negative electrode manifold, 10 is a disc spring, and 11 is a current collector.

The battery sub-module (90 cells) is constructed as shown in FIG. In FIG. 5, 20a, 2
Reference numerals 0b and 20c respectively denote 30-cell laminated bodies constituted by the respective members between the end plate electrodes 4 and 4 of FIG. 21a-21
d is a PVC end plate, and 22a and 22b are FRP end plates. Eighteen holes 23 are formed in the peripheral portions of the sides of the PVC end plates 21a to 21d and the FRP end plates 22a and 22b, respectively. 26 is a manifold.

The battery body is composed of the 30-cell laminated body 20a,
20b, 20c, end plate electrode 4, PVC end plates 21a to 21
d and the FRP end plates 22a and 22b are laminated in the horizontal direction, and the disc springs 24 provided on the FRP end plate 22b side are interposed, and the bolts 25 are inserted into the holes 23 and tightened. There is.

The battery of FIG. 5 has a structure of 30 cell stacks 20a, 2
0b, 20c, stacking of the end plate electrodes 4, etc. → tightening → hot water circulation → tightening force adjustment → leak test (by air).

The battery constructed as shown in FIG. 5 has a leakage characteristic as shown by the curve in FIG. 6, and does not change much with time.
The electrolyte does not leak even when the battery is continuously operated.

[0008]

Volume energy density is one of the battery performances, and it is necessary to improve it.
For that purpose, it is necessary to reduce the volume occupied in the space of the battery. In the device of FIG. 5, the disc spring 24 is a very useless space. Further, since 18 bolts are used, there is a drawback that the number of parts is large.

The present invention has been made in view of the above points, and an object thereof is to provide a zinc-bromine battery in which wasteful space is reduced to improve volumetric energy density and the number of parts of the device is reduced. .

[0010]

According to the present invention, (1) a plurality of unit cells are formed by sandwiching a separator between bipolar type intermediate electrodes having a flow path for circulating an electrolytic solution and a frame. An end plate having a plurality of holes formed in the peripheral portion of each side at both ends in the stacking direction of the laminate, and the length of each side being greater than the length of each side of the intermediate electrode and the separator. Each of the end plates, a spring portion having a spring is arranged at a portion connecting the opposing holes of each of the end plates with a straight line, and bolts are respectively inserted into the plurality of holes of the end plate to form the spring portion. The battery main body is configured by tightening bolts with the interposition of (2). (2) A separator is sandwiched between bipolar type intermediate electrodes having a flow path and a frame for circulating an electrolytic solution. A plurality of unit cells each of which is composed of End holes each having a hole formed in each of the four corners and each side having a length greater than the length of each side of the intermediate electrode and the separator, respectively, and the opposite holes of the respective end plates. A spring part having a spring is arranged at a portion connecting the straight lines, and bolts are respectively inserted into the four corner holes of the end plate, and the spring part is interposed to tighten the bolts to form a battery main body. Characterized by
(3) The spring portion has a container whose one end is fixed to an end portion of a bolt inserted into a hole of one end plate of the end plates at both ends in the stacking direction, and one end of which is the other end plate of the end plates. Is fixed to the end of the bolt that is inserted into the hole of the end plate of, and the other end is
And a spring fixed to the other end of the container.

[0011]

When the bolts are tightened, the spring force of the spring of the spring section applies a sufficient pressure to the laminate, so that the electrolyte does not leak to the outside. Since the disc spring does not exist in the bolt tightening portion as in the conventional case, the protruding portion on the outer peripheral portion of the battery body becomes considerably small. Therefore, useless space is saved and the volumetric energy density is improved. Further, in the invention according to claim 2, since the number of bolts is four, the tightening work is simplified.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1, the same parts as those in FIG. 5 are designated by the same reference numerals. The 30 cell stacks 20a to 20c,
The end plate electrode 4 and the PVC end plates 30a and 30b are laminated in the horizontal direction so that the lengths of the respective sides are the same. At both ends of this laminated body, PVC end plates 3 longer than the length of each side of the laminated body
1a, 31b and FRP end plates 32a, 32b are arranged.

The PVC end plates 31a, 31b and FR
Holes 33 ... Are drilled at the four corners of the P end plates 32a and 32b. Spring portions 34a to 34d each having a spring therein are arranged at portions where the holes of the PVC end plates 31a and 31b which face each other are connected by a straight line. Bolts 35a to 35d are inserted through the holes 33 ... Of the PVC end plate 31a and the FRP end plate 32a, and one ends of the bolts are fixed to one ends of the spring portions 34a to 34d.
Each hole 3 of the PVC end plate 31b and the FRP end plate 32b
Bolts 35e to 35h are inserted through 3, and one ends of the bolts are fixed to spring springs, which will be described later, at the other ends of the spring portions 34a to 34d.

The spring portions 34a to 34d are constructed as shown in FIG. FIG. 2 shows an example of the spring portion 34a, and one end of the case 40 has a bolt 35a.
One end of is stuck. Reference numeral 41 is a spring spring (coil spring) housed in the case 40, and one end thereof is fixed to the other end of the case 40. The end of the bolt 35e penetrates the case 40 and is fixed to the other end of the spring spring 41. The spring portions 34b to 34d are also configured in the same manner as above.

In the device constructed as described above, when the bolts 35a to 35h are tightened, the spring portion 3
The force of the springs 4a to 34d exerts sufficient pressure on the laminated body, so that the electrolytic solution does not leak to the outside. Since the disc spring does not exist in the bolt tightening portion as in the conventional case, the protruding portion on the outer peripheral portion of the battery body becomes considerably small. Therefore, useless space is saved and the volumetric energy density is improved. Further, according to the embodiment shown in FIG. 1, since only four bolts are required to be tightened, the tightening work is greatly simplified.

The holes 33 formed in the end plates are not limited to the four corners, but a plurality of holes 33 may be provided.
Bolts and springs may be provided.

[0017]

As described above, according to the present invention, a plurality of single cells each having a separator interposed between bipolar type intermediate electrodes having a flow path for circulating an electrolytic solution and a frame are laminated. An end plate having a plurality of holes formed in the peripheral portion of each side at both ends in the stacking direction of the laminated body, and the length of each side being larger than the length of each side of the intermediate electrode and the separator. Each of the end plates is provided with a spring portion having a spring at a portion connecting the opposing holes of the end plates with a straight line, and bolts are respectively inserted into the plurality of holes of the end plate to attach the spring portion. Since the battery main body is constructed by interposing the bolts and tightening the bolts, the following excellent effects can be obtained.

(1) Since a spring spring (coil spring) is used instead of the conventional disc spring, the volume of the spring itself is efficient.

(2) Since the spring spring (coil spring) is interposed between the end plate on one side and the end plate on the other side, the disc spring is provided at the bolt tightening position outside the end plate as in the conventional case. Wasted space has been reduced to 1/3 of that in the case of

(3) The number of bolts can be changed from 18 to 4, so that the number of parts can be reduced and the cost can be reduced.

(4) The wasted space is reduced and the volume energy density is remarkably improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a main part of an embodiment of the present invention.

FIG. 3 is a principle diagram of a zinc-bromine battery.

FIG. 4 is a configuration diagram showing a structure of a stack of a conventional zinc-bromine battery.

FIG. 5 shows a structure of a battery body of a conventional zinc-bromine battery, (a) is an overall configuration diagram, and (b) is a plan view of a PVC end plate.

FIG. 6 is a characteristic diagram showing leakage characteristics of a zinc-bromine battery.

[Explanation of symbols]

 4 ... End plate electrode 20a-20c ... 30 Cell laminated body 30a, 30b, 31a, 31b ... PVC end plate 32a, 32b ... FRP end plate 33 ... Hole 34a-34d ... Spring part 35a-35h ... Bolt 40 ... Case 41 ... spring

Claims (3)

[Claims] 1. A plurality of unit cells each having a separator sandwiched between bipolar type intermediate electrodes each having a flow path for circulating an electrolytic solution and a frame body are stacked, and both ends of the stack body in the stacking direction are stacked. End plates each having a plurality of holes formed in the peripheral edge of each side and each side having a length greater than the length of each side of the intermediate electrode and the separator are provided. A spring portion having a spring is arranged at a portion connecting the opposing holes with a straight line, and a bolt is inserted into each of the plurality of holes of the end plate. A zinc-bromine battery characterized by comprising a main body. 2. A plurality of unit cells each having a separator sandwiched between bipolar type intermediate electrodes each having a flow path for circulating an electrolytic solution and a frame body are stacked. End plates each having a hole drilled in each of the four corners and each side having a length greater than the length of each side of the intermediate electrode and the separator are respectively disposed, and the holes facing each other are opposed to each other. Spring parts having springs are arranged in straight line parts, bolts are inserted into the four corner holes of the end plate, and the bolts are tightened with the spring parts interposed to form the battery main body. A zinc-bromine battery. 3. The container, one end of which is fixed to an end of a bolt inserted into a hole of one of the end plates at both ends in the stacking direction of the spring portion, and one end of which is the end plate. Fixed to the end of the bolt inserted into the hole of the other end plate,
The zinc-bromine battery according to claim 1 or 2, wherein the other end comprises a spring fixed to the other end of the container.