JPH054692Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to a zinc-bromine battery among power storage batteries, and particularly relates to an electric vehicle battery using this battery.

B. Overview of the invention This invention relates to a high-voltage zinc-bromine battery with electrolyte circulation, in which multiple stacked cells are mechanically arranged in parallel, and the electrodes at one end of the stacked cells are shared. By integrally forming the electrodes and placing the electrodes at the other end as electrodes with terminals on the same end, it is possible to arrange the terminals in the same direction when applied to electric vehicles, etc. In addition, the present invention provides a high-voltage bipolar stacked zinc-bromine battery that is significantly more compact for a given power.

C. Prior Art In recent years, the development of batteries for electric vehicles has been actively carried out in various countries. The spread of electric vehicles in society depends on the development of high-performance, inexpensive, and compact batteries. Among various new types of batteries, zinc-bromine batteries are attracting attention as they meet the above requirements. However, unlike the configuration of conventional lead-acid batteries, this battery requires the use of a bipolar stacking method to increase the voltage. Therefore, when used as a power source for operating an electric vehicle motor (DC motor), 100V DC or 200V DC is required. In order to obtain such a high voltage with a zinc-bromine battery, the above-mentioned bipolar method is used to stack the batteries.

FIG. 6 is a perspective view illustrating a conventional bipolar method for stacking electrodes. In the figure, 1 is an intermediate electrode (plate), 2 is a diaphragm used as a separator,
3 and 3a are electrodes with terminals, 4 and 4a are end plates made of insulators, 5 is a tightening bolt for pressing and assembling the laminated cell stack, and 6 and 7 are electrolyte outflow inputs.

FIG. 5 is a schematic explanatory diagram of the zinc-bromine battery of electrolyte circulation type using the bipolar stacking method shown in FIG. 6. In the figure, the part numbers other than those shown in FIG. 6 are: 8 is a negative electrode electrolyte tank, 9 is a positive electrode electrolyte tank, 10 is a negative electrode electrolyte circulation flow path, 11 is a positive electrode electrolyte circulation flow path, 12 and 13 are pumps for electrolyte circulation. Since the operation and structure of this battery are already well known, the explanation thereof will be omitted.

D Problems to be solved by the invention In the conventional electrode lamination method as described above, for example,
When obtaining DC200V, the voltage per cell is 1.6V
This would require a stack of 125 cells. Laminating such a large number of cells requires a lot of lamination man-hours,
Furthermore, it is not so easy to assemble a stable and highly reliable battery, and there are also problems in terms of quality control.
Furthermore, as can be seen in Figures 5 and 6, the positive and negative terminals are separated on both sides, which makes the terminal arrangement extremely inconvenient when installed in an electric vehicle, and there are also problems in terms of handling. .

E. Means for solving the problem This invention was made to solve the above problem, and is a laminated cell consisting of a predetermined number of single cells by alternately arranging a plurality of electrode plates and diaphragm plates. and,
In the electrolyte circulation type bipolar laminated zinc-bromine battery having an electrode plate with a positive electrode and a negative electrode terminal provided at the end of the laminated cell, a plurality of the laminated cells are mechanically arranged in parallel, and the laminated cell A high-voltage zinc-bromine battery is obtained in which the electrodes at one end of the battery are integrally formed as a common electrode, and the electrodes at the other end are respectively provided with terminals, and are arranged on the same end side. be.

F Effect In this invention, a plurality of laminated cells are mechanically arranged in parallel, and the electrode at one end of the laminated cell is integrally formed as a common electrode, and the electrode at the other end is formed integrally. Since each electrode has a terminal, it is now possible to arrange the electrodes with terminals in the same direction, whereas conventionally they were taken out in different directions.This allows the entire battery to be assembled compactly, and the arrangement of the terminals is significantly simplified in practical terms. As a result, the degree of freedom in design and layout can be increased.

G. Embodiment of the invention FIG. 1 is a schematic explanatory diagram of an electrode lamination structure of a high-voltage zinc-bromine battery showing an embodiment of the invention. In the figure, 1 to 3, 3a are the same as in FIG. 5, and 14 is an end plate electrode. Since the two adjacent electrode surfaces indicated by + and - on the end plate electrode 14 can be used as a single cell, it is possible to fold and stack the end plate electrode (common electrode) surface as shown in the figure. In this case, the electrode 3 with a negative terminal and the electrode 3a with a positive terminal of the battery are arranged in the same direction, and a compact battery is constructed as a whole. Note that the discharge current passes through the laminated cell from the negative electrode (electrode) 3, turns around at the end plate electrode 14, and flows toward the positive electrode (electrode) 3a.

By adopting the stacking method shown in Figure 1, the stacking length of 125 cells can be reduced to half the stacking length of 63 cells, and the voltage is
DC200V can be obtained. Furthermore, since the positive and negative electrodes of the battery can be taken out on the same side, terminal processing is extremely simple when mounting the battery in an electric vehicle.

Further, FIG. 2 shows a laminated structure in which the laminated structure shown in FIG. 1 is arranged symmetrically with respect to the end plate electrodes, which is an extension of the method shown in FIG. 1. In the figure, 1
4a is a center electrode (common electrode) provided with four electrode surfaces on the front and back sides of the end plate electrode 14. As shown,
Using this center electrode 14a, the stack can be divided into two (32 cells each), and both stacks can be connected externally in either series or parallel to form a battery configuration.

FIG. 3 is a graph showing, as an example, the charge/discharge characteristics of a battery obtained by the lamination method shown in FIG. 1.
In the figure, the horizontal axis shows the charging/discharging time, and the vertical axis shows the voltage between the positive and negative electrodes of the battery, that is, the voltage between the terminals. After charging for 6 hours, the battery was immediately discharged for 6 hours. In this case, although the external appearance was 63 cells stacked as described above, DC 200V was maintained during discharge, and a stable discharge voltage was obtained, showing good results.

FIG. 4 shows a front view of the center electrode 14a. In the figure, inside the part indicated by the broken line is a CP (carbon plastic) electrode, which is 16
is an electrolyte manifold showing the lower injection ports (four). In the figure, for example, when side A is used as a negative electrode, its back side is the positive electrode side of the opposite stack, and when side B is used as a positive electrode, its back side is used as the negative electrode side. The effective area of each electrode surface in this case is 400 cm ² . When used as the end plate electrode 14, only one surface A and B in FIG. 4 are used as electrode surfaces.

H. Effects of the invention As explained above, this invention allows the electrodes of zinc-bromine batteries to be stacked in parallel so that the battery terminals can be taken out on the same side, making terminal processing easier in practical terms than for conventional batteries. Significantly simplified.

Further, in the intermediate electrode, end plate electrode, and center electrode used in any of the stack types shown in the above embodiments, the electrodes can be manufactured simultaneously, which has the advantage of reducing the number of manufacturing steps to about 1/2.

Furthermore, by adopting this stacking method, even when obtaining high voltage direct current with this battery, the entire battery becomes compact, and in particular, the stacking length is reduced to approximately 1/2, making it easier to use for practical design layout. This has the effect of increasing the degree of freedom.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the arrangement of battery electrodes in a zinc-bromine battery using an electrode stacking method using end plate electrodes, showing one embodiment of the present invention, and Fig. 2 is a center electrode showing another embodiment of the present invention. 3 is a diagram showing the charging/discharging characteristics of a battery using the method shown in FIG. 1, FIG. 4 is a schematic front view of the center electrode, and FIG. 6 is an explanatory diagram of the configuration of a high-voltage zinc-bromine battery using conventional bipolar lamination, and FIG. 6 is a perspective explanatory diagram showing the electrode arrangement in the conventional bipolar lamination method.

Claims (1)

[Claims for Utility Model Registration] (1) A laminated cell composed of a predetermined number of single cells by alternately arranging a plurality of electrode plates and diaphragm plates, and a positive electrode and a negative electrode provided at the ends of the laminated cell. In an electrolyte circulation type bipolar laminated zinc-bromine battery having an electrode plate with a terminal, a plurality of the laminated cells are mechanically arranged in parallel, and an electrode at one end of the laminated cells is integrated as a common electrode. 1. A high-voltage zinc-bromine battery, characterized in that the electrodes at the other end are electrodes with terminals and are arranged at the same end. (2) The electrode at the one end is common to the electrode at one end of a plurality of other stacked cells mechanically arranged in parallel with each other through the electrode. A high-voltage zinc-bromine battery according to claim 1 of the utility model registration claim.