JPS5855618B2 - 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, and an object of the present invention is to completely seal the battery and improve leakage resistance.

As shown in Fig. 8, conventional stacked dry batteries are made by stacking an appropriate number of flat unit cells a, and then abutting the positive terminal plate on the upper end to form a unit cell stack C. A compression jig e is brought into contact with the center of the positive electrode terminal plate of the laminate C and the center of the bonded electrode plate d of the lower unit cell, and a hot melt adhesive such as polyamide resin hot melt adhesive, wax, paraffin, etc. is applied. After forming an insulating coating layer f on the outer periphery of the unit cell stack C by immersing it in an insulating agent, the compression jig is removed, and the snap terminal g is brought into contact with the outer container as shown in FIG. Because the compression jig is assembled into the battery, the part where the compression jig comes into contact is not coated with the insulating material f, and the central parts of the positive electrode terminal plate and the coupling electrode plate d located at the upper and lower ends of the cell stack are exposed to the outside. Part 4 I
, 1 were formed, and the entire surface of the unit cell stack could not be covered with the insulating film layer f, and there was a drawback that the electrolyte leaked to the outside through the recesses 1+ 1 due to battery discharge.

The present invention eliminates the above-mentioned conventional drawbacks, and embodiments of the present invention will be described below with reference to the drawings.

1 is a positive electrode mixture mixed with an electrolyte containing manganese dioxide, acetylene black, and zinc chloride as main electrolytes. Heat-shrinkable cup 4 with bent portion glued
After storing the cup through a separator 5, an appropriate number of flat cells 6 obtained by heat-shrinking the cup are stacked to form a cell stack 1. A compression jig 11 is attached to the center part of the positive electrode terminal plate 9 made of a tin plate having a carbon film 8 on the lower surface which is in contact with the positive electrode mixture 1 of No. 6, and the center part of the carbon film 2 of the lower end unit cell 10 of the unit cell stack. 12 to compress the unit cell stack 7 from above and below to a certain size, and in this compressed state, as shown in FIG. It is immersed in a heat-melting insulating material 14 such as the like, taken out and cooled to form a coating layer 15 of an insulating material on the surface of the unit cell stack 70.

Next, the compression jigs 11 and 12 are removed from the unit cell stack, and as shown in FIG. 3, the compression jigs 1L and 12 are brought into contact with the coating layer 15 at the upper and lower ends of the unit cell stack 1 during coating with the insulating material. The recesses 16 and 1 are exposed to the outside, where the positive electrode terminal plate 9 and the carbon film of the bonding electrode are partially exposed to the outside without being coated with the insulating material due to the
6 is formed.

In the JIS name 006p type laminated dry cell, this recess 16.16' is formed by the thickness of the insulating coating layer 15, that is, approximately 1 to 2
rrvn, and the shape of the recess is a rectangular shape with a width of 6 mm and a length of 12 mm, which is the same as the cross-sectional shape of the compression jig, so that the positive electrode terminal plate 9 and the carbon film 2 of the lower end unit cell 10 are exposed to the outside.

This recess 16.16' is filled with heat-melting insulating material 1 such as polyamide resin hot-melt adhesive, wax, paraffin, etc.
1 is impregnated and coated on both sides or on one side and is made of a natural or synthetic fiber such as pulp, cotton, vinyl chloride, polyamide resin, etc., and is punched out with a press into four pieces to obtain an insulating agent-coated sheet piece 19. Then, this sheet piece 19 is inserted into the recesses 16, 16' to form a heating press jig 20 with a built-in heater as shown in FIG. 20 is placed on an insulating agent-coated sheet piece 19, the insulating agent 17 of the sheet piece is heated and melted, and then thermocompressed to the positive electrode terminal plate 9 and the carbon film 2 of the lower end unit cell 10 to form the concave portion 16 of the unit cell stack. 16 is buried and the entire outer periphery of the unit cell stack is covered with a heat-melting insulating material to obtain a sealed dry cell stack 21 as shown in FIG.

As shown in FIG. 1, this laminated dry battery consists of a protrusion 25 of a positive lead plate 24 and a protrusion of a negative lead plate 26 riveted to a positive snap terminal 22 and a negative snap terminal 23, respectively, which are attached to an insulating plate as external terminals. The insulating agent coated sheet pieces 19 and 19 are respectively pierced at the portions 27 and connected to the positive electrode terminal plate 9 and the carbon film 2 of the lower end unit cell 10, and an exterior jacket 28 is attached to commercialize the product.

As described above, the present invention provides a compression jig 11 for unit cell stack 1,
12 are brought into contact with each other and immersed in the molten insulating material to form a coating layer 15 of the insulating material. After removing the compression jig, the heat-melting insulating material 1 is applied to the four parts 16° 16 of the coating layer 15.
After inserting an insulating agent-coated sheet piece obtained by punching and forming a non-woven fabric tape impregnated with No. Since a laminated dry battery 21 is obtained in which the entire outer periphery of the unit cell laminate is covered by heat bonding, there is no leakage route for the electrolyte during battery discharge, and the leakage resistance is improved.

In addition, the insulating material-covered sheet pieces for embedding the recesses 16 and 16' are punched out from non-woven tape impregnated with a heat-melting insulating material to match the size of the four parts. The handling of the covering sheet becomes easier,
Moreover, since the insulating agent is eluted from the nonwoven fabric tape when it is melted with a heating and pressing jig, it can be easily adhered to the positive terminal plate and the carbon film, making it possible to cover the outer periphery of the unit cell stack with the insulating agent.

Incidentally, 50 JIS name 006p type laminated dry cells obtained in the above example and 50 laminated dry cells of the same shape as shown in FIG. The number of leaking batteries was measured under conditions of continuous discharge for days, and the following results were obtained.

As described above, the present invention can provide a laminated dry battery with excellent leakage resistance.

[Brief explanation of the drawing]

FIGS. 1 to 7 are cross-sectional views of essential parts for explaining the method of manufacturing a laminated dry battery according to the present invention, and FIGS. 8 to 9 are cross-sectional views of essential parts for explaining a conventional method of manufacturing a laminated dry battery. 6...Thousand-shaped unit cell, 1...Unit cell laminate, 9...Positive terminal plate, 10...Lower end unit cell, 11゜12... ...Compression jig, 15...
...Coating layer, 19.19'...Insulating agent coated sheet piece.

Claims (1)

[Claims] 1. The center part of the positive terminal plate placed on the upper end of the unit cell stack in which flat unit cells are stacked, and the center part of the carbon film of the bonding electrode of the unit cell located at the lower end of the unit cell stack. A compression jig is brought into contact with the cell stack, immersed in a melted polyamide resin-based hot melt adhesive, wax, paraffin, or other heat-melting insulating agent, and taken out. After forming, the compression jig is removed from the upper and lower ends of the unit cell stack, and the boria oxide resin is placed in the recess where the positive terminal plate and the carbon film of the bonding electrode, which are not coated with the insulating material, are exposed to the outside. After inserting an insulation-coated sheet made by punching four pieces of non-woven fabric tape impregnated with heat-melting insulation such as hot-melt adhesive, wax, or paraffin, apply a hot pressing jig to the insulation-coated sheet. A method for producing a laminated dry cell battery, which comprises contacting, melting, and heat-bonding the positive electrode terminal plate and carbon film, and covering the entire outer periphery of the cell laminated body with an insulating material and sealing it.