JPH05135807A - Manufacture of stacked battery - Google Patents

Abstract

PURPOSE:To reduce the size and the weight of a battery by reducing a space required for welding while securing the required welding strength when a battery is manufactured by thermowelding the frame parts of an electrode plate and a separator plate. CONSTITUTION:The sectional forms of welding ribs 17 and 18 formed on a middle electrode frame 8b and a separator frame 12 are made triangular, and the total sectional area of the ribs is made small, and the total sectional area of the rib release grooves is thereby made small, and the welding ribs 17 and 18 are thermowelded and united with each other under pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery component frame such as an electrode plate having a synthetic resin insulating frame formed on the outer periphery of a conductive member and a separator plate having a synthetic resin frame formed on the outer periphery of a separator. The present invention relates to a method for manufacturing a laminated battery in which body members are welded and integrated with each other.

[0002]

2. Description of the Related Art Recently, development of a battery power storage system has been promoted, and zinc bromine battery, zinc chlorine battery, redox flow battery, etc. have been developed as part of the development. These take an electrical series laminated structure in order to extract a high voltage. A zinc bromine battery will be taken as an example to describe the outline of the configuration. As shown in FIG. 2, the main body of the zinc-bromine battery has bipolar electrodes, which are stacked and electrically connected in series. In FIG. 2, 6 is a separator plate in which an insulating frame is integrally formed on the outer periphery of the separator, and 8
Is a bipolar type electrode plate in which an insulating frame is integrally formed on the outer periphery of a conductive member. The separator plate 6 is sandwiched between the electrode plates 8 and the spacer mesh 7 and the packing 5 are stacked on both sides to form a single cell. The current collecting electrode 3, the laminated end plate 2 and the tightening end plate 1 are overlapped with each other and fastened with bolts and nuts to be integrated.

In the battery body thus constructed, the electrolytic solution contains an electrode plate 8, a frame of the separator plate 6 and a positive electrode manifold 9 and a negative electrode manifold 10 formed at four corners of the packing 5, a channel 13, a micro channel. Inflow and outflow through the electrolyte flow path.

The conductive member of the electrode plate 8 is formed of a carbon plastic thin plate formed by kneading a conductive substance such as carbon into plastic, and the separator portion of the separator plate 6 is made of a fine porous film. The frame body of the separator plate 6 is made of polyolefin resin such as polyethylene.

As described above, the conventional laminated battery is tightened from both ends of the laminated battery to press the electrodes of the electrode plates and the frame of the separator plate into contact with each other to form each unit cell and the electrolyte flow path. When the electrolytic solution is supplied to each cell, there is a problem that the electrolytic solution leaks from the laminated surface (sealing failure). To prevent this, the following sealing method has been adopted.

Welding method: hot plate welding, vibration welding. Crimping method (bolt tightening) …… Spring, disc spring, packing, sealant. The welding method is a method in which the frame and the frame are physically melted and attached, and the crimping method is a method in which leakage is prevented by mechanically applying a force from the outside.

Although the crimping method is simple, it is inferior in reliability for a long time (one year or more) due to creep of resin and rubber. On the other hand, the welding method is very reliable in that sense when the resin of the frame and the resin are completely melted. Among them, when a large number of hot plate welds are laminated, the welding performance is superior to that of vibration welding. Vibration welding is caused by the difficulty of propagating vibration when a large number of layers are stacked.

[0008]

The element of hot plate welding is shown in FIG.
As shown in FIG. 1, the welding ribs 14 and 15 and the rib clearance groove 16
Composed of. Basically, the ribs 14 and 15 of the separator frame 12 and the intermediate electrode frame 8b are melted by a hot plate (not shown) and pressed in that state, and the melted resins are entangled and enter the rib escape groove 16. In FIG. 3, reference numeral 13 is a channel of the electrolytic solution flow path.

As shown in FIG. 3, when the cross-sectional area (hatched portion) of the rib clearance groove 16 is smaller than the cross-sectional area of the ribs 14 and 15, there is no place for resin to enter, and the frame 8
A gap opens between b and 12. That is, the battery cannot fit in the predetermined thickness. The total cross-sectional area of both ribs 14 and 15 is 300 × 10 ^-2 mm ² , and the total cross-sectional area of the groove 16 is 100 × 10 ^-2 mm ² .

On the other hand, as shown by the hatched portion in FIG. 4, when the groove cross-sectional area is sufficiently large, all burrs produced during welding are contained in the groove 16 and the battery can be constructed with a zero interframe gap. The rib cross-sectional area in FIG. 4 is 240 × 1.
0 ^-2 mm ^2, groove cross-sectional area is 250 × 10 ^-2 mm ^2. However, when the distance between the channel 13 and the welding rib 14 is short as shown in FIG. 3, the groove width cannot be sufficiently set as shown in FIG. That is, assuming that the total rib cross-sectional area is reduced to 240 × 10 ^-2 mm ² and the total groove cross-sectional area is widened to 280 × 10 ^-2 mm ² as shown by the numerical values after changing the broken line portion in FIG.
The distance between the channel 13 and the rib clearance groove 16 is 0.5m
Therefore, it becomes impossible in terms of mold processing and frame molding.

The present invention has been made in view of the above points, and an object thereof is to ensure a required welding force even if the cross-sectional areas of the welding ribs and the groove cross-sectional areas are significantly reduced. An object of the present invention is to provide a method for manufacturing a laminated battery, which can reduce the size and weight of the battery.

[0012]

DISCLOSURE OF THE INVENTION The present invention is a method for manufacturing a laminated battery in which flat plate-like electrode plates and separator plates are alternately laminated and integrated, wherein the electrode plates are rectangular flat plate-like electrodes. An insulating frame made of synthetic resin integrally formed on the outer peripheral edge of the electrode, and a welding rib formed on the insulating frame along the outer peripheral edge of the electrode and having a triangular or trapezoidal sectional shape. The separator plate is a rectangular flat plate-shaped separator, a synthetic resin frame integrally formed on the outer peripheral edge of the separator, and a pair of pairs provided on both opposite sides of the frame. An electrolytic solution flow path, a welding rib having a triangular or trapezoidal cross-sectional shape formed on the frame body outside the electrolytic solution flow path and along the outer peripheral edge portion of the separator, and welding of the frame body The relief formed on the frame by contacting both sides of the rib And a plurality of electrode plates are sandwiched between the electrode plates by sandwiching the electrode plates, and the electrode plates facing each other and the welding ribs of the separator plates are heated and melted, and the electrodes are pressure-bonded together to form the electrode. And an insulating frame body and a frame body, and a battery reaction chamber is formed in a portion divided into two parts by the separator, and an electrolytic solution flow path in which an electrolytic solution is formed in the frame body in the battery reaction chamber It is characterized by being circulated through.

[0013]

When the welding ribs of the electrode plate and the separator plate facing each other are heated and melted, all burrs generated by the melted welding ribs enter the escape groove. At this time, since the cross-sectional areas of the welding ribs that are welded to each other are triangular or trapezoidal, the cross-sectional areas of the relief grooves on both sides can be made smaller than in the conventional ones. Therefore, even if the distance between the electrolytic solution flow path and the welding rib is short, a sufficient clearance groove space can be secured, and burrs caused by the welding rib do not overflow from the clearance groove and block the electrolytic solution flow path. Instead, each frame body is integrated. Since the cross-sectional area of the escape groove can be reduced in this way, the size and weight of the battery can be reduced.

It should be noted that the above-mentioned effects are obtained not only when the present invention is applied to a zinc-bromine battery, but also when it is applied to a laminated battery such as a zinc-chlorine battery and a redox flow battery.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a laminated battery of the present invention will be described below with reference to the drawings. In FIG. 1, FIG.
The same parts as those in FIG. 4 are indicated by the same reference numerals.

In FIG. 1, the separator frame 12 and the intermediate electrode frame 8b are provided with welding ribs 17 and 18 each having a triangular sectional shape. By thus forming the welding ribs 17 and 18 in a triangular cross-sectional shape, the rib cross-sectional area is significantly reduced, and the rib relief groove 16 can be formed to have a small cross-sectional area. Therefore, as shown in the drawing, even if the distance between the channel 13 and the ribs 17 and 18 is short, it can be produced without any problem. Also ribs 17, 1
Even if the cross-sectional shape of 8 is triangular, the welding force is ensured in the rib width, and therefore the welding force is completely the same as that of the conventional rib having a rectangular cross section. Further, burrs generated by the welding ribs 17 and 18 do not overflow the escape groove 16 and block the channel 13, and the separator frame 12 and the intermediate electrode frame 8b are integrated. The total cross-sectional area of the ribs 17 and 18 is 150 × 10 ^-2 mm ² , and the total cross-sectional area of the rib clearance groove 16 is 210 × 10 ^-2 mm ² . The ribs 17, 18
The sectional shape of is not limited to a triangular shape, but may be formed in a trapezoidal shape due to restrictions on the die processing.

In the above embodiments, the case where the present invention is applied to a zinc bromine battery is described, but the present invention is not limited to this, and it is applied to a laminated battery such as a zinc chlorine battery and a redox flow battery, or hot plate welding is applied. It can be applied to other chemical cells, and in these cases, the same action and effect as described above can be obtained.

[0018]

As described above, according to the method for manufacturing a laminated battery of the present invention, the cross-sectional shape of the welding ribs formed on the electrode plate and the separator plate is triangular or trapezoidal, so that the required welding force is secured. However, the space (rib clearance groove) in the frame required for hot plate welding can be significantly reduced, and the size and weight of the battery can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a cross section of a main part of a frame for explaining an embodiment of a method for manufacturing a laminated battery of the present invention.

FIG. 2 is an exploded perspective view of essential parts showing a battery body of a conventional zinc bromine battery.

FIG. 3 is a configuration diagram showing a cross section of a main part of a frame body for explaining an example of a conventional method for manufacturing a laminated battery.

FIG. 4 is a configuration diagram showing a cross section of a main part of a frame body for explaining another embodiment of the conventional method for manufacturing a laminated battery.

[Explanation of symbols]

3 ... collection electrode, 6 ... separator plate, 8 ... electrode plate, 8b ...
Intermediate electrode frame, 9 ... Positive electrode manifold, 10 ... Negative electrode manifold, 12 ... Separator frame, 13 ... Channel, 14, 15, 17, 18 ... Welding rib, 16 ... Rib relief groove.

Claims (1)

[Claims] 1. A method of manufacturing a laminated battery, wherein flat plate-shaped electrode plates and separator plates are alternately laminated and integrated, wherein the electrode plates are rectangular flat plate-shaped electrodes and an outer peripheral edge portion of the electrodes. An insulating frame made of synthetic resin integrally formed, and formed on the insulating frame along the outer peripheral edge of the electrode, and formed by welding ribs having a triangular or trapezoidal cross-sectional shape, the separator plate A rectangular flat plate-shaped separator, a synthetic resin frame integrally formed on the outer peripheral edge of the separator, a pair of electrolytic solution flow passages respectively provided on both opposite sides of the frame, and the electrolysis Outside the liquid flow path and along the outer peripheral edge of the separator, a welding rib having a triangular or trapezoidal cross-sectional shape formed on the frame body, and in contact with both sides of the welding rib of the frame body, And an escape groove formed in the frame, the electrode plate While sandwiching the separator plates, a plurality of the electrode plates are laminated, and the welding ribs of the electrode plates and the separator plates facing each other are heated and melted, and are pressure-bonded together to form the electrodes, the insulating frame and the frame. A battery reaction chamber is formed in a portion surrounded by the body and divided into two parts by the separator, and an electrolytic solution is circulated in the battery reaction chamber through an electrolytic solution flow path formed in the frame. A method of manufacturing a laminated battery comprising the following.