JPH08339813A - Manufacture of button type alkaline battery - Google Patents

Abstract

PURPOSE: To provide a manufacture of a button type alkaline battery by which such a structure as allowing no contact between alkaline electrolyte filled in a negative electrode and a separator until the battery opening is sealed is formed so as to prevent a leak of the alkaline electrolyte. CONSTITUTION: After insertion of a pressing molded positive electrode mixture into a positive electrode case 5, the positive electrode 5 is squeezed so as to be lessened in a radius direction. The relation among the inside diameter ϕ5 of the positive electrode case 5, and the upper portion outside diameter ϕ 6a and the lower portion outside diameter ϕ6b of an insulation packing 6 is set to be ϕ6a>=ϕ5>ϕ 6b so as to allow no contact between alkaline electrolyte filled in a negative electrode and nonwoven fabric of a separator layer until a battery opening is sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method for manufacturing a button type alkaline battery. More specifically, the present invention relates to a method of manufacturing a button type alkaline battery which can prevent the alkaline electrolyte from leaking when the battery is sealed.

[0002]

2. Description of the Related Art Conventionally, a button-type battery has a sealing plate and an insulating packing arranged in advance (hereinafter referred to as a negative electrode component), and a power generating element is housed in the positive electrode case and the sealing plate. And the inner side of the opening of the positive electrode case is tightened to press the insulating packing against the sealing plate for sealing. Also, in order to easily combine the positive electrode case and the negative electrode component, the upper outer diameter Φ6 of the insulating packing
The relationship between a and the lower outer diameter Φ6b is Φ6a> Φ6b, and the relationship with the inner diameter Φ5 of the positive electrode case is Φ5>Φ6a> Φ6.
b.

[0003]

As described above, when the relationship between the upper outer diameter Φ6a and the lower outer diameter Φ6b of the insulating packing and the inner diameter Φ5 of the positive electrode case is Φ5>Φ6a> Φ6b, zinc and alkaline electrolytes are used. When the negative electrode sealing plate filled with is coupled to the positive electrode case with the positive electrode mixture and the separator inserted, the alkaline electrolyte filled in the negative electrode contacts the nonwoven fabric, and the alkaline electrolyte fills the outer periphery of the nonwoven fabric until the battery is sealed. There is a problem that the alkaline electrolyte easily leaks from between the positive electrode case and the insulating packing due to the pressure at the time of sealing the battery.

[0004]

In order to solve these problems, according to the present invention, a positive electrode mixture pressure-molded in a tablet shape is inserted into the positive electrode case, and then the outer periphery of the positive electrode case is squeezed in the radial direction (diameter reduction). ), The relationship between the inner diameter Φ5 of the positive electrode case, the upper outer diameter Φ6a of the insulating packing, and the lower outer diameter Φ6b is Φ6a ≧
By setting Φ5> Φ6b, the structure is such that the alkaline electrolyte filled in the negative electrode and the non-woven fabric do not come into contact with each other until the battery is sealed.

[0005]

By using the above-described structure and manufacturing method, the fitting of the positive electrode case and the negative electrode component can be easily adjusted, and the function of suppressing the leakage of the alkaline electrolyte immediately after sealing the battery is excellent.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A silver oxide battery which is a button type alkaline battery will be described below with reference to the drawings.

In this example, a silver oxide battery SR621 having a diameter of 6.8 mm and a height of 2.1 mm was prepared. FIG. 1 is this sectional view. In FIG. 1, 1 is a sealing plate which also serves as a negative electrode terminal, and 2 is a negative electrode active material made of zinc powder. Three
Is a separator layer having a multilayer structure composed of a polyethylene graft film, first cellophane, second cellophane, and synthetic resin nonwoven fabric, 4 is a positive electrode active material made of silver oxide, 5 is a positive electrode case, and 6 is an insulating packing.

The method of manufacturing the battery of this embodiment is as follows. After the positive electrode mixture 4 pressure-molded in the shape of a tablet is inserted into the positive electrode case 5, the outer periphery of the positive electrode case 5 is squeezed so as to be smaller in the radial direction as shown in FIG.
The relationship between the inner diameter Φ5 of the positive electrode case 5 and the upper outer diameter Φ6a of the insulating packing 6 and the lower outer diameter Φ6b shown in (B) is Φ5 <Φ.
6b, Φ5 = Φ6b, Φ6a>Φ5> Φ6b, Φ5 = Φ
6a.

In the conventional manufacturing method, the positive electrode case 5 is used.
After inserting the positive electrode mixture pressure-molded into a tablet shape into the inside, pressure-molding is performed again, and the relationship between the upper outer diameter Φ6a and the lower outer diameter Φ6b of the insulating packing 6 and the inner diameter Φ5 of the positive electrode case 5 is Φ5>Φ6a> Φ6b. After that, the separator layer 3 was inserted, the negative electrode sealing plate 1 filled with zinc and an alkaline electrolyte was coupled, and then the battery case 5 and the inner side were caulked and sealed to form a battery.

The battery manufactured according to this example is referred to as a battery a, the battery manufactured according to the conventional example is referred to as a battery b, and the number of leaks of the alkaline electrolyte from between the positive electrode case and the insulating packing immediately after sealing the battery is examined. It shows in (Table 1).

[0011]

[Table 1]

As is clear from this (Table 1), in the battery a of the present invention, the relationship between the inner diameter Φ5 of the positive electrode case, the upper outer diameter Φ6a of the insulating packing, and the lower outer diameter Φ6b is Φ5.
<Φ6b, Φ5 = Φ6b, Φ6a>Φ5> Φ6b, Φ5
By setting Φ6a, it is possible to obtain a structure in which the alkaline electrolyte filled in the negative electrode and the nonwoven fabric of the separator are not in contact with each other until the battery is sealed. By this, it was confirmed that leakage of the alkaline electrolyte immediately after sealing the battery can be suppressed.
On the other hand, in the battery b of the conventional example, leakage of the alkaline electrolyte immediately after sealing the battery is large. This is the upper outer diameter of the insulating packing Φ
6a, the lower outer diameter Φ6b, and the inner diameter Φ5 of the positive electrode case are set to Φ5>Φ6a> Φ6b, so when the battery is constructed, the alkaline electrolyte filled in the negative electrode reaches the nonwoven fabric at the bottom of the gasket until the battery is sealed. It is considered that the non-woven fabric permeated and pressed the non-woven fabric at the time of sealing the battery to leak the alkaline electrolyte. Also, when the relation between the lower outer diameter Φ6b of the insulating packing and the inner diameter Φ5 of the positive electrode case is Φ5 ≦ Φ6b, it is difficult to combine the positive electrode case and the negative electrode component, and it is confirmed that the negative electrode component is removed from the positive electrode case. Was done.

[0013]

As is clear from (Table 1) above, the positive electrode case is squeezed so that the inner diameter Φ5 becomes smaller in the radial direction according to the upper outer diameter Φ6a and the lower outer diameter Φ6b of the insulating packing. The relationship between the inner diameter Φ5 of the case, the upper outer diameter Φ6a of the insulating packing, and the lower outer diameter Φ6b is expressed as Φ6.
By setting a ≧ Φ5> Φ6b, the positive electrode case and the negative electrode component can be easily combined, and leakage of the alkaline electrolyte immediately after the battery is sealed can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a battery according to an embodiment of the present invention.

FIG. 2A is a diagram for explaining a radial direction drawing of the positive electrode case. FIG. 2B is a diagram showing a dimensional relationship between the positive electrode case and the insulating packing.

[Explanation of symbols]

 1 Sealing plate 2 Negative electrode active material 3 Separator layer 4 Positive electrode active material 5 Positive electrode case 6 Insulating packing Φ5 Inner diameter of positive electrode case Φ6a Upper outer diameter of insulating packing Φ6b Lower outer diameter of insulating packing

Claims (2)

[Claims] 1. A power generating element is housed in a positive electrode case and a sealing plate, an insulating packing is disposed between the positive electrode case and the sealing plate, and the insulating packing is tightened inside the opening of the positive electrode case. In a method of manufacturing a button-type battery in which a sealing plate is pressed and sealed, a positive electrode case inner diameter Φ5 is squeezed to be smaller in a radial direction with respect to an upper outer diameter Φ6a and a lower outer diameter Φ6b of an insulating packing. Φ
6a ≧ Φ5> Φ6b. A method of manufacturing a button type alkaline battery, characterized in that: 2. A battery produced by the method according to claim 1.