JPH06452Y2 - Gasket for battery case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a battery case gasket used by being incorporated in a battery cell such as an electrolysis tank or an electrodialysis tank.

(Prior Art) An electrolyzer is a device that is widely used as, for example, an electrolyzer for electrolyzing a raw material or an electrodialysis tank for purifying and concentrating a raw material solution.

Generally, the battery case is divided into an anode chamber, a cathode chamber and the like by, for example, an ion exchange membrane. If necessary, a plurality of ion exchange membranes may be used to provide one or more intermediate chambers between the anode chamber and the cathode chamber. At this time, the anode chamber,
As a method of giving a predetermined volume to each of the battery case chambers of the cathode chamber or the intermediate chamber, there is a method of using a frame body having a thickness, for example. This frame is to seal the circumference of the battery compartment and is provided between the electrode plate and the ion exchange membrane or between the two ion exchange membranes, and one element that determines the volume of each battery compartment. Has become.

In addition, as a material of these frame bodies, a material such as polypropylene resin having good dimensional stability and being hardly deformed is generally used. However, even if a frame body made of a material that is not easily deformed is used, for example, when an electrode plate or an ion exchange membrane is pressed to form a battery case, and there is unevenness on either surface, the unevenness causes the unevenness. A minute gap is created, and the liquid supplied to and discharged from the battery case leaks to the inside or the outside of the battery container through this gap.

As a method for preventing the leakage of liquid due to the generation of a minute gap in such a battery case, generally, a gasket made of an elastic material such as ethylene-propylene rubber is pressure-contacted with each of the above-mentioned battery container parts to form the battery case. There is a way to assemble.

Then, liquids such as the raw material liquid and the production liquid are mixed with each other into the respective battery compartment chambers that are composed of the battery container gaskets as described above, the ion exchange membrane, the frame body, the electrode plate and other parts. It is fed and discharged without doing. As a method of supplying and discharging the liquid to and from each of the battery case chambers, for example, a gasket for the battery case, an ion exchange membrane, a frame body having a thickness, and an electrode plate are provided with communication holes for supplying and discharging the liquid in advance. There is a method of supplying and discharging a predetermined liquid through a liquid flow path formed by connecting the communication holes in the battery case. That is, this supply / discharge method by the communication hole method can shorten the distance between the electrodes of the battery case, reduce the electric resistance of the liquid in the battery case, and lower the battery voltage to reduce the power consumption. Can be reduced.

(Problems to be Solved by the Invention) In the battery case in which the above-mentioned communication holes are provided to supply and discharge the liquid, especially when it is necessary to supply and discharge two or more different liquids to the battery case, In order to make the electric resistance of the liquid as low as possible and to keep the battery case voltage low, the battery container gasket is provided with a plurality of communication holes for supplying and discharging two or more different liquids.

However, in a battery case configured by using a battery case gasket provided with a plurality of communication holes for supplying and discharging two or more kinds of liquids as described above, the case where the sealing surface has the minute unevenness as described above is If different liquids leak and mix into the space between the communication holes and then flow into the battery compartment, the product purity may be deteriorated, resulting in undesirable results. Therefore, an object of the present invention is to provide a battery case gasket having a structure in which different liquids are mixed to prevent a decrease in product purity in a battery case that supplies and discharges liquids by such a communication hole method. To do.

(Means for Solving the Problems) As a result of intensive studies on the structure of the gasket for the battery case, the inventors of the present invention have provided a groove or slit between the communication holes of different liquids on the sealing surface of the gasket. As a result, they have found that the above problems can be easily solved, and completed the present invention. That is, the present invention is
A gasket for a battery case, characterized in that a groove or a slit is provided between the communication holes for different liquids on the sealing surface of the battery case gasket having a communication hole for supplying and discharging a liquid.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are schematic views showing a specific embodiment of the present invention.

The battery case gasket of the present invention has a communication hole for supplying and discharging two or more different liquids. For example, as shown in FIG. 1, communication holes 1 and 1'and communication holes 2 and 2'are provided in one battery case gasket. Of these, one type of liquid is passed through the communication hole 1.1 ', and the other type of liquid is passed through the communication holes 2, 2'to supply and discharge, respectively. Although the position and diameter of the communication hole are not particularly limited, it is generally determined by comprehensively judging the mechanical strength of the battery case gasket having the communication hole, the liquid supply / discharge liquid flow rate, and the like. Although it is possible to freely decide which communication hole is to be used for supply and which communication hole is to be discharged, the communication holes 1 and 2 at the lower part are normally used for supply so that the liquid flows upward in the battery chamber. The communication holes 1'and 2'are used for discharging.

The main feature of the battery case gasket of the present invention is that the sealing surface 3
The groove 4 or the slit 5 is provided between the communication holes of the different liquids, that is, between the communication holes 1 and 1'and the communication holes 2 and 2 '. FIG. 1 shows a mode in which the groove 4 is provided, and FIG. 2 shows a mode in which the slit 5 is provided. Here, the groove 4 provided in the sealing surface 3
May be provided on both surfaces of the two sealing surfaces 3 of the battery case gasket as shown in FIG. 1, or may be provided on only one surface of the two sealing surfaces 3. Providing the groove 4 only on one side of the seal surface 3 is a case where there is no risk of different kinds of liquids leaking and mixing between communication holes of different liquids in the seal surface 3 where the groove 4 is not provided. Even in such a case, it is possible to provide the grooves 4 on both surfaces of the sealing surface 3.

When the battery case using the battery case gasket of the present invention is operated, the seal of the battery case chamber due to the battery case gasket is incomplete, and the liquid supplied to and discharged from the battery case chamber leaks to the sealing surface 3. However, the leaked liquid can be retained in the groove 4 or the slit 5 without moving beyond the groove 4 or the slit 5. Therefore, even if different liquids leak into the seal surface 3 and mix, the mixed liquid of the different liquids passes through the communication hole forming the liquid flow path or the gap generated in the seal surface 3 to form the battery case chamber. Can be prevented from flowing into. Moreover, even if any one of the liquids supplied to and discharged from the battery case leaks to the sealing surface 3, the leaked liquid reaches the communication hole for supplying and discharging another kind of liquid, the battery chamber, etc. The liquids can be prevented from mixing.

The position of the groove 4 or the slit 5 provided in the battery case gasket may be anywhere between communication holes of different liquids in the sealing surface 3, but especially between the communication holes of the battery case gasket having the groove 4 or the slit 5. Considering the mechanical strength and the like in the portion (4), it is preferable to provide the groove 4 or the slit 5 so as to pass exactly in the middle between the communicating holes of different liquids.

The length of the groove 4 or the slit 5 provided on the sealing surface 3 of the battery case gasket is not particularly limited as long as it can hold the liquid leaked to the sealing surface 3 completely as described above. Then, the liquid held in the groove 4 or the slit 5 is preferably discharged to the outside of the battery case in order to prevent deterioration of product purity. In order to discharge the liquid held in the groove 4 or the slit 5 to the outside of the battery case, it is preferable that at least one end of the groove 4 or the slit 5 reaches the outer thickness surface of the battery case gasket. At this time, in order to quickly discharge the liquid to the outside of the battery case, the groove 4
Alternatively, it is more preferable that the slit 5 is provided so as to be inclined downward toward the outer thickness surface as shown in FIG.

When the groove 4 is provided on the seal surface 3, the cross-sectional shape of the groove 4 when cut perpendicularly to the length direction of the groove 4 is not particularly limited, but a general cross-sectional shape of the groove 4 is as shown in FIG. It is a semicircle, a triangle or a quadrangle as shown in.

Further, the depth of the groove 4 and the width of the groove 4 on the seal surface 3 are not particularly limited, but the liquid leaked to the seal surface 3 overflows from the groove 4 provided between the communicating holes of different liquids on the seal surface 3. Therefore, it is necessary to increase the volume of the groove portion to some extent so as not to flow into the battery case chamber. Generally, the depth of the groove 4 is 0.5 to 2 mm, and the width of the groove 4 on the sealing surface 3 can be appropriately determined within the range of 1 to 10 mm.

On the other hand, when the slit 5 is provided on the sealing surface 3 as shown in FIG. 2, the width of the slit 5 is not particularly limited, but is generally 1 to 10 mm for the same reason as when the groove 4 is provided.
Can be appropriately determined within the range.

The material of the battery case gasket of the present invention is not particularly limited, but an elastic and tough material such as ethylene-propylene rubber or silicone rubber is preferably used.

The size of the battery case gasket of the present invention is not particularly limited, but it is preferable that the size is such that each battery chamber forming the battery case can be completely sealed. Therefore, in consideration of the standard size of the battery case, the length and width of the battery case gasket are 20 to 100 cm and 50 to 100 cm, respectively.
Is generally used.

The thickness of the battery case gasket of the present invention is not particularly limited. However, it is preferable that the thickness of the battery case gasket is such that it will not be compressed and damaged when it is provided by pressing against the battery case parts. Although it depends on the material, it is preferable that the thickness is 1 mm or more.

When the battery case gasket is provided in pressure contact with the ion exchange membrane to seal the battery case chamber adjacent to the ion exchange membrane, the window 6 is provided as shown in FIG. Can be in contact with the ion exchange membrane, and the volume of the battery compartment can be expanded. In this way, when the window 6 is provided in the battery case gasket, the sealing surface 3 of the battery case gasket is
A liquid is supplied to and discharged from the battery case chamber forming a part of the window 6 and the communication holes 1 and 1 ′, and a liquid flowing through the communication holes 1 and 1 ′ closest to the window 6. It is preferable that the types of the liquids flowing through the two different liquid flow paths described above are the same so that there is no problem even if and are mixed. Further, in the battery case gasket provided with the window 6, the sealing surface 3
Similarly to the case where the groove 4 or the slit 5 is provided between the communicating holes for different liquids, the groove or the slit can be provided between the window 6 on the sealing surface 3 and the communicating holes 1 and 1 '. Particularly, when the liquid flowing through the electrolytic cell of which the window 6 forms a part and the liquid flowing through the communication holes 1 and 1'are different from each other, it is preferable to provide the groove or slit as described above.

When assembling a battery case using the battery case gasket of the present invention,
In order to form the liquid flow path without shifting the communication hole, the first
As shown in the figure, the guide hole 7 is preferably provided in each component of the battery case such as the battery case gasket. When a battery is put through this guide hole 7 by assembling a rod-like object, the liquid flow path formed by the communication holes 1 and 1'or the communication holes 2 and 2'is displaced on the way, and the liquid is sealed from this displaced position. It is possible to prevent leakage to the surface.

INDUSTRIAL APPLICABILITY The battery case gasket of the present invention can be widely used in known battery cases such as an electrolysis tank or an electrodialysis tank.
The position where the battery case packing of the present invention is used is an ion exchange membrane, a frame body having a thickness that gives a predetermined volume to the battery case chamber,
It is between the components that make up the battery case, such as the electrode plate and the liquid supply frame.
In particular, it is preferable to use the battery case gasket of the present invention between the parts which are required to completely prevent the leakage of the liquid supplied to and discharged from the battery case. The battery case gasket of the present invention is
One sheet may be used alone, or a plurality of sheets may be stacked and used.

(Effects of the Invention) As can be understood from the above description, according to the battery case gasket of the present invention, it is possible to prevent different liquids supplied to and discharged from the battery case from mixing, and even if different liquids are used. Even if the liquids are mixed, it is possible to prevent the mixed liquid of the different liquids from flowing into the battery compartment, so that the mixed liquid of the different liquids does not flow into the battery compartment and the product It is possible to prevent the occurrence of an undesirable phenomenon such as a decrease in purity. Therefore, the battery case gasket of the present invention is extremely useful particularly in a battery case for producing high-purity products.

[Brief description of drawings]

1 and 2 are schematic views showing a specific embodiment of the present invention. FIG. 1 shows a mode in which a groove is provided, and FIG. 2 shows a mode in which a slit is provided. In the figure, reference numerals 1, 1'and 2, 2'represent communication holes, 3 seal surfaces, 4 grooves, 5 slits, 6 windows, and 7 guide holes.

Claims (1)

[Scope of utility model registration request] 1. A gasket for a battery case, wherein grooves or slits are provided between the communication holes of different liquids on the sealing surface of the battery case gasket having a communication hole for supplying and discharging liquid.