JPS5845784B2 - Manufacturing method for laminated dry batteries - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a laminated dry battery, which allows a block battery in which unit cells are stacked to be easily inserted into a rectangular exterior can without reducing the battery capacity.

A conventional laminated dry battery uses a rectangular outer can 1 as shown in FIGS. 5 and 6, with its lower end opening 2 bent inward to serve as a bottom plate support, and the upper end which is not bent in any way. Opening 3
A block battery (not shown) is inserted, a terminal plate and the like are placed thereon, and then the upper end opening 3 is bent inward for assembly.

However, in this case, since the shape of the opening 3 of the outer can 1 is almost exactly rectangular, when inserting a similarly rectangular block battery into it, a part of the block battery may get caught in the can opening. However, there was a problem in that it was difficult to insert.

This is because the outer dimensions of the block battery are made close to the inner dimensions of the outer can. Therefore, by reducing the outer dimensions of the block battery, the block battery can be easily inserted into the outer can.

However, on the other hand, the reduction in the size of the block battery resulted in a reduction in the amount of anode mixture, resulting in a reduction in battery capacity.

The present invention provides a substantially trapezoidal opening in which one of a pair of opposing sides of an opening at one end of a rectangular outer can is longer than the other, and a block battery is inserted into the outer can through the substantially trapezoidal opening. After being inserted into the interior, the approximately trapezoidal opening is bent inward to form an approximately rectangular shape to form a laminated dry battery.

With this method, the block battery can be easily inserted into the outer can without reducing its size, and a sufficient battery capacity can be ensured.

An embodiment of the manufacturing method of the present invention will be described below with reference to the drawings.

1 and 2 show a rectangular outer can 1 used in the present invention, the lower end opening 2 of which is bent inward as in the conventional case.

As shown in FIG. 2, the upper end opening 4 has a length tl of one of the opposite short sides 5a which is longer than the length t2 of the other 5b.
The length is approximately i to 17ILrIL.

Reference numeral 6 denotes a taper on one of the long sides to make the shape of the opening substantially trapezoidal due to the difference in length of the short sides.

Note that the substantially trapezoidal shape of the upper end opening may be formed by making one of the opposing long sides longer than the other, but in consideration of the block battery insertion process, it is preferable to make one of the short sides longer than the other.

That is, when inserting the block battery 7 into the outer can 1, instead of inserting the block battery 7 vertically from above the outer can 1, insert the block battery 7 at a slight angle as shown in FIG. The lower end portion 8 is inserted into the can 1, and then the battery 7 is inserted into the can 1 with the battery 7 standing straight up.

Therefore, when the block battery 7 is first inserted into the can 1, in order to do this smoothly, it is inserted into the can 1 from the short side 5a which is longer than the opposite side and has a wider opening. Inserting the block battery 7 into the can is extremely easy.

Thereafter, the position of the block battery 7 may be adjusted to the state shown in FIG. 4, and the block battery 7 may be inserted into the can as described above.

If one short side is made longer than the opposite side in this way, the external dimensions of the block battery will not be reduced in any way.
A Heblock battery can be inserted inside the outer can.

After inserting the battery, the upper end opening 4 of the outer can 1 is bent inward using a forming jig or the like to form a substantially rectangular shape, thereby completing the stacked battery.

Due to the inward bending of the upper end opening of the outer can 1 using a jig, there was a dimensional deviation, and the upper end opening, which had a substantially trapezoidal shape, was reshaped into a nearly rectangular shape like the lower end opening. molded.

Therefore, in the completed stacked dry battery, there is almost no distortion in the external dimensions, and the battery can be made similar to conventional batteries.

The manufacturing method of the present invention, in which the opening at one end of the outer can, which serves as the insertion opening when inserting the battery, is approximately trapezoidal, and does not involve bending outward or widening the entire opening, The can opening can be easily bent inward without any trouble, and the upper opening can be bent without unnecessary wrinkles or folds.

As described above, according to the manufacturing method of the present invention, a block battery can be easily inserted into an outer can without reducing the external dimensions, and a laminated dry battery with excellent battery performance can be efficiently manufactured.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the rectangular outer can used in the manufacturing method of the present invention, Figures 3 and 4 are explanatory diagrams for inserting the block battery into the outer can, and Figures 5 and 6 are The figure shows an outer can of a conventional stacked dry battery. 1...Exterior can, 4...Top opening, 5
a...The longer side of the opposing short sides, 5b.
...One short side, 7...Block batteries.

Claims (1)

[Scope of Claims] 1. One end of the opening at one end of the square outer can is made longer than the other to form a substantially trapezoidal opening, and a block battery is inserted through the substantially trapezoidal opening. A method for manufacturing a laminated dry cell battery, which comprises inserting the cell into an outer can and then bending the substantially trapezoidal opening inward to form a substantially rectangular shape. 2. The method for manufacturing a laminated dry battery according to claim 1, wherein one end opening of the outer can is rectangular, and one of a pair of opposing short sides is longer than the other.