JPS58100356A - Layer-built dry cell - Google Patents

Abstract

PURPOSE:To increase the preservation performance and the liquid-leakage resistant performance of a layer-built dry cell, and enhance the work efficiency and the yield of the cell by directly fusing the peripheral part of a conductive carbon film to the peripheral part of a thermo-contractile synthetic-resin cell case by high-frequency dielectric heating. CONSTITUTION:After the carbon film (thermoplastic resin, a conductive carbon film coated with the vinyl chloride resin) and the peripheral part of a prefolded cell cup 5 (thermo-contractile vinyl chloride resin) are punched, sticking work is carried out through a push pestle under a pressure of 8-9kg/cm<3> by feeding a high-frequency current with an oscillation frequency of 20MHZ to a coil for 0.4sec so as to make a cell cup. As a result, an adhesive strength of 5-6.5kg/ cm<3> is maintained, which is higher and has a smaller variation than an adhesive strength of 1.5-3.9kg/cm<3> achieved by the conventional adhesive method. After that, a separator is placed in the cell cup, and electrolyte is poured from above the positive mixture, thereby constituting an elementary battery.

Description

[Detailed Description of the Invention] The present invention provides a conductive carbon film (hereinafter referred to as a carbon film) that constitutes a carbon-zinc bonded electrode (hereinafter referred to as a bonded electrode) of a laminated dry battery.
We improved the bonding method between the periphery and the periphery of a heat-shrinkable synthetic resin cup-shaped cell waste container (hereinafter referred to as a cell cup) to improve storage performance and leakage resistance, as well as improve work efficiency and yield. The purpose is to measure the improvement of

The structure of the unit cell of the S-006P stacked dry cell is as shown in FIG. That is, in this figure, (1) is the bonding electrode, (2) is the cathode zinc plate, (3) is the carbon film formed on one side of the zinc plate, and (4) is the connection between the carbon film periphery and the cell cup periphery. The adhesive layer (5) is a cell cup, (6) is a separator, (7) is a starch layer formed on the separator, and (8) is an anode mixture.

In a unit cell having such a configuration, waxes or solvent-based adhesives have conventionally been mainly used to bond the carbon film peripheral portion of the bonding electrode fi+ to the cell cup peripheral portion. Waxes have relatively good workability, but their adhesive strength is weak and the bond between the carbon film and the cell cup often peels off when subjected to impact such as dropping. In addition, if heated molten wax is applied to the tip of a stamping jig and accidentally comes into contact with the cell cup when stamping on the carbon film in the cell cup, the cell cup will be deformed by the heat and adhesive failure will occur. . The electrolyte permeates through these peeled parts and places with poor adhesion, leading to internal leakage accidents, resulting in leakage and performance deterioration after storage.

In the case of adhesives, the adhesive strength is relatively strong, which is problematic, but since a solvent is used, they tend to volatilize and change in viscosity, causing various problems during work. If a large amount of solvent is used, a portion of the solvent will be absorbed by the carbon film, causing a decrease in adhesion to the zinc surface, and in severe cases, peeling will occur, and corrosion of the zinc surface will occur due to penetration of the electrolyte, reducing the electrical resistance of the bonded electrode. results in an increase in On the other hand, if the amount of solvent is small, the adhesive will be highly mature and potassium, and it will be difficult to apply it evenly to the periphery of the carbon membrane, resulting in areas where the adhesion fails, and internal leakage will occur due to penetration of the electrolyte. This led to deterioration in battery performance. Furthermore, the line was contaminated due to the scattering of waxes, adhesives, etc., which caused great difficulties in reducing work efficiency and making machine maintenance more frequent.

In order to solve the above drawbacks, the inventors made extensive efforts to find a bonding method that does not use adhesives, which have many problems, and as a result, they discovered a high-frequency induction heating method.

FIG. 3 shows an overview of the apparatus of the invention. Between the push punch (111) equipped with a tip (I3) having an appropriate thickness and elasticity such as silicone rubber, and the cell cup jig 0, insert a bonding electrode (111) with the zinc side facing down and the carbon film facing up. ) and the peripheral edge of the cell cup (5) which has been bent in advance, and apply appropriate pressure to the adhesive part using a punch (111).

Next, the coupling electrode (1), the cell cup (5), and the tip Q3 of the push punch are positioned so as to be surrounded by the coil I, and a high frequency current is passed through the coil to generate induction heat within the coil.

The zinc plate (2;) is instantaneously heated by this induction heat, and this heat is not transmitted to the carbon membrane (3) and cell cup (5), generating the necessary amount of heat, and due to the thermal effect and external pressure effect. Mutual heat welding occurs quickly, and welding is completed by stopping the current supply, cooling, and stopping the application of pressure.The conditions for welding are not constant depending on the materials to be bonded, the thickness, the bonding location, etc., but usually oscillation Frequency 1~20MH7, Pressure 5~2oKf
Good adhesion can be obtained with /cI11 emission time of 02 to 2 seconds.

According to the present invention, the bonding electrode (1) of a unit cell of a stacked dry battery
The periphery of the carbon film and the periphery of the cell cup (5) are completely bonded using high-frequency induction heating, completely preventing internal leakage from the bonded area during use or storage of the dry battery. did it.

In addition, in the case of a unit cell of an ultra-small laminated dry cell, where the bonding area between the carbon film periphery and the cell cup periphery is extremely small, conventional waxes or solvent-based adhesives cannot completely adhere the bonding area. However, with the high frequency induction heating method of the present invention, complete adhesion can be achieved.Also, the ultrasonic welding method has some problems in terms of adhesive strength, but it is difficult to set the conditions for adhesion. However, it was difficult to prevent the occurrence of breakage, holes, etc. at the periphery of the cell cup.In particular, it was difficult to prevent the periphery of the cell cup from adhering to the periphery of the carbon film of the bonding electrode of the ultra-small stacked dry battery. This method is not possible in high-speed mass production snow removal, which requires a small number of jigs to set conditions, and is inferior to the high-frequency induction heating method.

As described above, the high-frequency induction heating method of the present invention can be completely bonded by high-frequency induction heating without using adhesives, which have had various problems, so it can improve the quality of seed layer dry batteries and improve and stabilize work efficiency. The contribution effect is extremely large.

An embodiment of the present invention will be described below. FIG. 2 of the drawings shows a unit cell of a laminated dry cell made according to the present invention. (4
') shows the bonded part using high-frequency induction heating.

Clamp the carbon film of the bonding electrode (1) (thermoplastic resin = conductive carbon film using vinyl chloride resin as coating agent) and the periphery of the pre-bent cell cup (5) (heat-shrinkable vinyl chloride resin). Then, a high frequency current with an oscillation frequency of 20 MH2 was applied to the coil at a pressure of 8 to 9 Kt/m through the push rod.
A cell cup was made by bonding under working conditions where electricity was applied for seconds. The adhesive strength Fi was maintained at 5 to 65 V4/d, and the adhesive strength was improved with less variation compared to the conventional adhesive method of 1,5 to 3,9 V4/CI++.

A separator was placed in this cell cup, an anode mixture was inserted, and an electrolyte was poured over it to produce a unit cell.

Six of these cells are stacked and fixed at a constant pressure, waxed to form a stack, covered with heat-shrinkable vinyl chloride resin, and attached with terminals and an outer can.JIS name S-
A 006P type stacked dry battery was manufactured and subjected to testing.

Tests of duration performance, over-discharge leakage performance, and high-temperature leakage resistance were conducted to compare the product according to the present invention (3) and the product made using a conventional wax adhesive (b). The duration performance was determined by JIS test T20°C, 600Ω (4 hours/day, final voltage 5.4V), and the performance after 3 months at 45°C was expressed as an index with the value immediately after production set as 100. The average value of 5 samples was used for each sample.

Over-discharge leakage performance is expressed as the number of leakages after one month of continuous storage at 600Ω at 20℃, and high-temperature leakage resistance is expressed as the number of leakages after three months of storage at 45℃.The number of samples is 50 for each. The results are shown in Table 1.

Table-1 As shown in Table-1, the laminated dry battery (5) of the present invention has a great effect of greatly improving the duration performance, over-discharge leakage performance, and high-temperature leakage resistance performance compared to the conventional method. It turns out that there are a lot of things.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the right half showing the structure of a unit cell of a conventional S-006P stacked dry cell. Figure 2 is 8-006P of the present invention.
A sectional view of the right half showing the structure of a unit cell of a stacked dry battery. - Figure 3 is a front view of a cross section showing the apparatus for the high frequency induction heating method of the present invention. In the figure, the reference numeral (11 is a bonding electrode, (2) is a negative zinc plate, (3) is a carbon film formed on a zinc plate, (4) is an adhesive layer, (4') is an adhesive part according to the present invention, ( 5) is a cell cup, (6) is a separator, (8) is an anode mixture, aO is an adhesive press, 0 is a cell cup receiving jig, and I is a coil. Procedural amendment (method) 1981 April 22nd, Mr. Commissioner of the Japan Patent Office l Display of the case 1982 Patent Application No. 1977242, title of the invention Laminated dry battery 3 Relationship with the case of the person making the amendment Patent applicant address Rokuban-cho, Chiyoda-ku, Tokyo No. 13, No. 4, Date of amendment order: March 30, 1982 (shipment date) 58 Drawing subject to amendment Plane 6 Contents of amendment as per attached sheet

Claims (1)

[Claims] Directly welding the periphery of the conductive carbon film on one side of a carbon-zinc bonded electrode with a conductive carbon film using a thermoplastic resin as a coating agent to the periphery of a heat-shrinkable synthetic resin cell container by high-frequency induction heating. A laminated dry battery characterized by: