JPS5846573A - Battery - Google Patents

Abstract

PURPOSE:To enable an inner can in which an electrode plate group is inserted, and a sealing plate around which a sealing gasket is attached to be liquidtightly joined together without using any adhesive such as pitch, and simplify the manufacturing process of a battery by providing the sealing gasket with a connection part, and liquidtightly integrating the said connection part with the brim of the inner can. CONSTITUTION:A unified case is assembled by liquidtightly joining an inner can 6 and a sealing gasket 8 together by holding a brim 6a of the inner can 6 between an expanded part 8b which extends vertically from a horizontal bottom 8a, and a horizontally extending piece 8c which is integrated with the extreme end of the expanded part 8b. Since the adhesive strength between the can 6 and the gasket 8 is high, there is no need to take special care in handling the above unified case during assembly work of a battery.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cylindrical battery assembled by internally inserting a spiral plate group.

More specifically, the current collector rod of one electrode is wound around 21, -
- Insert the coiled spiral electrode plate into the inner plate, connect the sealing plate to the upper end of the collector rod that protrudes above the inner plate, and attach the sealing plate to the periphery of the sealing plate ( This invention relates to an improvement in a battery which is sealed by tightening the packing with the open end of the outer can using the inward facing flange provided at the upper part of the inner can as a seat.

Batteries with this type of structure are suitable for high energy density organic electrolyte batteries because they are resistant to vibrations and shocks and are capable of high rate discharge.

However, since the electrode plate group is tightly wound in a spiral shape and inserted into the interior, a complicated operation is required to inject the electrolyte, and the desired discharge cannot be achieved because the electrolyte cannot be injected sufficiently into the electrode plate group. There were disadvantages in that the characteristics could not be obtained, fcv, and the electrolytic solution that was not absorbed by the electrode plate group leaked to the outside.

With reference to FIG. 7, the process of pouring liquid into a battery in which the spiral electrode plate is inserted into the inner cavity will be explained. In the figure.

Reference numeral 1 denotes an electrode plate group 7'c in which a negative electrode plate 3 and a positive electrode plate 6 surrounded by a separator 4 are spirally wound around the negative electrode current collector rod 2 as the center of winding. In addition, it is constructed by cutting out a part of the circumference of a hollow cylindrical body with two current collecting rods in the vertical direction. Negative electrode 3
The current collector is constructed by crimping a metal lithium sheet onto a current collector made of a net or the like, and the end of the current collector is inserted into the notch of the current collector rod 2, and is fixed to the rod 2 by spot welding.

The positive electrode 6 is formed by molding a mixture containing manganese dioxide as an active material around a current collector made of a net or the like, and is surrounded by a separator 4 made of a non-woven polypropylene fabric. Only the current collector is exposed.

Reference numeral 6 denotes a metal inner can having an inward facing flange 6a at its upper end, and accommodates the above-mentioned electrode plate group 1 from its lower open end. The exposed portion of the current collector at the end of the winding of the positive electrode 6 is in contact with the inside of the inner cover 6 .

Reference numeral 7 indicates a sealing plate which also serves as a negative electrode terminal, and 8 indicates a sealing packing made of polypropylene and having a curved cross section, into which a bent portion of the peripheral edge of the sealing plate is fitted. Then, the upper end of the negative electrode current collector rod 2 is spot welded to the inside of the sealing plate 7, and
The lower surface of the sealing packing 8 is integrated with the upper surface of the flange 6a of the inner cover 6 by a sealant 9 such as pitch.

1. Regarding this adhesion, apply a sealant 1, for example, a toluene solution of pitch, to the upper surface of the flange portion 61L in advance.
This can be done when the sealing plate 7 is coupled to the current collector rod 2.

Injection of the electrolyte is carried out by inserting a needle-like or nozzle-like injection port into the hollow portion 2a of the negative electrode current collector rod 2, using the current collector rod as a conduit.

The electrolyte contains 1 mol/l of lithium perchlorate in a mixed solvent of propylene carbonate and 1,2-dimethoxyethane.
Use dissolved ones.

In the conventional example, the inner cover 6 and the sealing packing 8 are bonded together using a sealant such as pitch.
In the structure in which the sealing plate 7 with the attached sealing plate 7 is integrated with a sealant such as pitch, leakage of the electrolyte from the adhesive part occurs after the electrolyte is injected and until the outer can is closed. This is something that has the role of preventing this. However, it is necessary to apply a large amount of pitch in order to achieve perfect liquid tightness, which is a matter of course. Therefore, if the welding pressure is increased during bonding, the excess pitch will be applied to the bonded area. It often overflows from the inside and adheres to the outer peripheral wall of the sealing backing, creating an obstacle when covering the outer can, and when a large number of assembled containers are placed next to each other, they adhere to each other's walls, making it difficult to assemble the battery. Furthermore, pitch bonding has low mechanical strength and requires special consideration in handling, which has been a major obstacle in designing mass production equipment.

In the present invention, in an assembly of an inner cover into which a group of electrode plates is inserted and a sealing plate disguised as a sealing backing, the sealing packing is integrated with the lower surface and a bulge provided vertically from the lower surface and the bulge tip. The horizontally extending piece provided on the inner can flange is liquid-tightly integrated with the inner can flange, thereby solving the problems caused by adhesives such as pitch.

The following is a diagram showing an example of a battery according to an embodiment of the present invention.
explain. FIG. 1 shows a sectional view of the completed battery, in which 10 is an outer can, 11 is an insulating bottom plate, and 12 is a liquid reservoir in the assembly.

FIG. 2 is a cross-sectional view showing the liquid injection process of the above-mentioned assembly, in which the electrode plate group and the negative electrode current collector rod 6 are shown for ease of explanation.

is omitted. 8 in the figure is a sealing packing whose ring and bayonet ring-like appearance is shown in FIGS. 3 and 4, and the horizontal bottom surface 8 &,! : The inner flange ail is fitted with the vertically provided bulge 8b and the horizontally extending piece 8C integrally provided at the tip of the bulge, and the inner flange 6 and the sealing packing 8 are liquid-tightly joined and integrated. It forms an assembled container. FIG. 6 shows a cross-sectional view of another embodiment of the present invention during the liquid injection process.
Similar to FIG. 2, the electrode plate group and negative electrode current collector rod are omitted.

8 in the figure is a sealing backing whose external appearance is shown in FIG. 6, which has a bulging part 8b formed in the vertical direction from the horizontal bottom surface 8a, and a mushroom-shaped horizontally extending piece SC6 provided at the tip.

These three members fit into the through hole eb'l provided in the inner can flange 61L to form a liquid-tight assembled container.

According to the present invention, since the bonding strength between the inner cover 6 and the sealing backing 8 is high, there is no need to pay special consideration to the handling of the assembly container during battery assembly work.

The design of mass production equipment can be easily designed, and liquid-tight bonding is possible without using adhesive sealants such as pitch.
These four products simplify the battery manufacturing process and solve the conventional problems associated with the pitch coating and bonding processes.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of the main parts of the battery according to the present invention;
FIG. 2 is a vertical cross-sectional view showing the assembly of the inside cover and the sealing plate;
3 and 4 are perspective views showing the sealing lock/gage, FIG. 6 is a longitudinal cross-sectional view showing an assembly of the inner cover and the sealing plate in another example of the present invention, and FIG. A perspective view of the backing, and FIG. 7 is a vertical cross-sectional view showing an assembly of a conventional inner cover housing a spiral electrode plate group and a sealing plate. 1... spiral electrode plate group, 2... current collector rod,
6... Internal detective, 6 &... Tsubabe, 7...
...Sealing plate, 8...--Sealing backing 4, 8...Horizontal lower surface (bottom surface) of backing. 8 b'...Bulging part, SC...Horizontally extending piece, 10... Outer can. Name of agent: Toshio Nakao and 1 other person Figure 1 Figure 2 rXJIt Figure 3 r Figure 4 Figure 5 Figure 6 323- Figure 7 2

Claims (1)

[Claims] A sealing plate that also serves as one electrode terminal, a sealing backing attached to the peripheral edge of the sealing plate, an inner cover having an inward flange that contacts the lower surface of the sealing backing, and a collector whose upper end is connected to the inner surface of the sealing plate. An electric rod, a group of electrode plates that are spirally wound around the current collector rod as the center of winding and inserted into the inner tube, and the other electrode terminal that houses the inner tube and has its upper open end fastened to the peripheral edge of the sealing backing. The sealing packing has a bottomed cylindrical outer can that also serves as an inner can, and the sealing packing has a lower surface thereof, a bulge provided vertically from the lower surface, and a horizontally extending piece integrally provided at the tip of the bulge. A battery♂ characterized by being integrated with the flange in a liquid-tight manner