JPH07183020A - Manufacture of organic electrolyte battery - Google Patents

Abstract

PURPOSE:To prevent the generation of cracks or breakage of a valve during sealing work to enhance working efficiency in the manufacturing process of sealing structure having an explosion preventing valve in an organic electrolyte battery using a light metal such as lithium as a negative active material. CONSTITUTION:A valve 1a is installed in the bottom 1d, protruded toward battery case side, of a dish-shaped sealing plate 1. The dish-shaped sealing plate 1 is previously assembled by crimping inward a peripheral standing part 1b of the dish-shaped sealing plate 1 to fix a valve 3 which blocks the valve 1a from the inside of the dish-shaped sealing plate 1 and a ring-shaped reinforcing plate 4 arranged on the upper surface of the valve 3. The opening of a battery case 5 is bent inward through an insulating gasket 8 against a peripheral, horizontal flat part 2b of a terminal cap 2 to press-hold the peripheral, horizontal flat part 2b and a peripheral flat part 1c of the dish-shaped sealing plate 1, and an organic electrolyte battery is thereby manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sealing structure provided with an explosion-proof valve device for an organic electrolyte battery, which is composed of a light metal such as lithium as a negative electrode active material.

[0002]

2. Description of the Related Art In recent years, the progress of electronics such as IC and LSI has been remarkable, and the electric current consumption of electronic precision equipment to which these are applied is in the order of .mu.A, which requires only an extremely weak current. In addition, small size and light weight, high energy density, and long-term reliability are required for primary batteries as the power source for these batteries. As a battery satisfying these requirements, metallic lithium or lithium-aluminum (Li
-Al) alloy such as a lithium-based alloy as a negative electrode active material, a non-proton-based high dielectric constant, low-viscosity non-aqueous electrolyte solution as an electrolyte solution, and a metal oxide such as manganese dioxide or copper oxide as a positive electrode active material. Alternatively, there is an organic electrolyte battery configured using fluorinated graphite. When these batteries are operated for a long period of time, stable hermeticity and airtightness are required in terms of battery design, and sealing with extremely high airtightness is performed. Therefore, if the battery is charged due to internal short circuit, external short circuit, or wetting current, gas is generated inside the battery, and if the internal pressure of the battery rises abnormally, the battery bursts and is extremely dangerous. . So far,
The structure of the sealing plate B as shown in FIG. 2 was used. Second
In the figure, reference numeral 1 denotes a dish-shaped sealing plate having a valve hole 1a on its inner bottom surface, which swells in accordance with an increase in battery internal pressure and is naturally destroyed by a cutting blade 2a provided on a terminal cap 2 or gas pressure. The valve body 3 made of a thin metal plate, synthetic rubber, synthetic resin alone, or a composite thin plate is arranged.
The valve body 3 is configured such that the peripheral edge rising portion 1b of the dish-shaped sealing plate is bent inward, and is sandwiched by the flat peripheral edge portion 2b of the terminal cap 2 and the inner peripheral bottom surface portion 1c of the dish-shaped sealing plate 1. I was taking it. Further, the valve body 3 is designed so that the valve body 3 is damaged at a relatively low internal pressure of about ²⁰ to 40 kg / cm ² , and gas in the battery is scattered.
In order to materialize such low pressure operability, it is necessary to make the wall thickness of about 0.1 to 0.3 m / m.

[0003]

In the case of the above method, it is extremely thin in the work of inserting the valve body composed of the synthetic rubber, the synthetic resin, the metal thin plate alone or the composite member into the sealing plate. As a result, during work, it may stick out from the dish-shaped sealing plate, cause a center shift, or be damaged or damaged by burrs or edge portions of the terminal cap or the like. Also, the battery internal pressure rises,
When the valve body bulges upward, as shown in FIG. 4, in the conventional case, the peripheral flat portion 2b of the terminal cap and the corner 2d of the convex portion 2c have an R (rounded) shape. When the valve body bulges upward due to the internal pressure, the valve body bulges along the corner R, so that the breaking pressure of the valve body itself,
Alternatively, there was variation in the damage pressure when the cutting blade came into contact and was damaged.

[0004]

SUMMARY OF THE INVENTION The present invention provides a method for manufacturing an organic electrolyte battery having an explosion-proof valve device that solves the above-mentioned problems. Specifically, the plate-shaped sealing plate on the battery container side is provided. Through the ring-shaped reinforcing plate on the upper surface of the valve body that closes the valve hole from the inside of the sealing plate with a valve hole on the bottom surface protruding to the inside of the rising edge of the peripheral edge of the dish-shaped sealing plate. Secure the valve body and the reinforcing plate by crimping to one side, pre-configure the dish-shaped assembly sealing plate, and engage the one in which the battery-side protruding bottom surface of the dish-shaped assembly sealing plate and the conductive lead piece are fixed to the battery case in advance. Step of fitting it into the insulating packing, then engaging the terminal cap provided with the cutting edge facing the valve body on the protruding part on the upper surface of the peripheral rising part of the plate-shaped sealing plate, and then the peripheral edge of the terminal cap. Flatten the battery case through an insulating packing. Flat portion of the terminal cap by folding the opening of the scan inward, and the step of nipped the dish-like sealing plate is to produce an organic electrolyte battery.

[0005]

With this structure, after the valve material is fixed by the reinforcing plate, the cap is inserted and placed, and the opening of the battery case is bent inward through the insulating packing to seal the battery. Since the pressing force at the time of sealing does not directly act on the valve body material via the terminal cap, damage and damage can occur when the valve body is installed in the sealing plate, work efficiency can be improved, and the variation in damage pressure is small. A valve body can be provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. A is a sealing plate provided with an explosion-proof mechanism according to the present invention, and has a plate-shaped sealing plate 1 having a valve hole 1a on the bottom surface of a protruding portion 1d protruding toward the battery container, and a first stage of the plate-shaped sealing plate. A disk-shaped valve body 3 is placed on the horizontal peripheral edge 1c of the plate, and a reinforcing plate 4 having a hole 4a at the center is placed on the upper surface of the valve body 3, and the peripheral edge rising portion 1b of the plate-shaped sealing plate is mounted. Is bent inward, and the valve element 3 and the reinforcing plate 4 are connected to the plate-shaped sealing plate at the first peripheral edge horizontal flat portion 1
The plate-shaped assembled sealing plate 1 is preliminarily constructed by sandwiching it under pressure contact with c. Therefore, the valve body 3 always closes the valve hole 1a of the dish-shaped sealing plate. As the applicable material of the reinforcing plate 4, a corrosion-resistant metal material such as stainless steel or nickel plate having a plate thickness of about 0.3 m / m, or a material such as synthetic resin or rubber is applied by lining or laminating method. The combination is effective. 5 is a battery case containing a positive electrode, a negative electrode active material, and a power generating element of an organic electrolyte, 6 is a fluoride,
An electrode group in which a positive electrode active material of a metal oxide is formed into a sheet shape, and a metal lithium sheet which is a negative electrode active material is wound around a separator material.
Is connected to the inner bottom surface of the battery case 5 or the sealing plate A. Reference numeral 8 denotes an insulating packing attached to the peripheral portion of the sealing plate A to prevent insulation between both electrodes of the battery and prevent leakage of the internal electrolytic solution.

Next, the method of manufacturing the organic electrolyte battery of this embodiment will be described. As described above, the valve hole 1a is provided in the bottom surface 1d of the dish-shaped sealing plate 1 protruding toward the battery case side, and the valve hole 1a is formed in the dish shape. The valve body 3 which is closed from the inside of the sealing plate and the ring-shaped reinforcing plate 4 arranged on the upper surface of the valve body are fixed by caulking the rising edge 1b of the plate-shaped sealing plate inwardly. After the dish-shaped sealing plate is pre-configured, the battery-side protruding bottom surface 1d of the dish-shaped sealing plate and the conductive lead piece 7 for connecting to the power generating element are fixed to the opening of the battery case 5. 8 and then engage the terminal cap 2 having the protruding portion with the cutting edge 2a facing the valve body on the upper surface of the peripheral rising portion 1b of the plate-shaped sealing plate, and then flatten the peripheral edge of the terminal cap 2 horizontally. The battery case 5 is provided with the portion 2b through the insulating packing 8. An opening peripheral horizontal flat portion 2b of the bent terminal cap inwardly, and then nipped with peripheral horizontal flat portion 1c of the dish-like sealing plate 1 is intended to produce an organic electrolyte battery.

[0008] As the valve body material for which 500 sealing plates of the above-mentioned embodiment and conventional sealing plates were respectively configured and the breaking pressure of the valve body was measured, a thin metal plate of aluminum having a thickness of 30 µm and a thickness of 50 µm were used. A laminated polyethylene film was used. The results are shown in (Table 1).
In the experiment, the terminal cap was not provided with a cutting edge, that is, the breaking pressure of the valve material itself was used.

[0009]

[Table 1]

Table 2 shows a comparison of the occurrence rate [%] of scratches or tears on the valve body material at the time of assembling the sealing plate. The numbers in the table are the comparisons when 20,000 pieces were produced. It was done.

[0011]

[Table 2]

The valve disc shift is a disc shift from the normal insertion position, and the valve disc biting is that the disc disc is displaced when the rising edge of the peripheral edge of the plate-shaped sealing plate is bent inward. The one bent in the state is shown.

As is clear from FIGS. 3 and 4, the reason why a uniform breakage pressure is obtained is that according to the present invention, when the internal pressure of the battery rises, when the valve body expands upward, the fulcrum of the valve body Since the reinforcing plate having a sharp contact surface is interposed in the portion 3a and the valve body is firmly pressed and fixed through the reinforcing plate, excessive expansion and deformation of the valve body material are prevented. This is because the internal pressure of the battery is concentrated on the pressure receiving portion of the valve body without being raised. On the other hand, in the conventional type, the fulcrum is located at the flat peripheral portion of the terminal cap and the corner R portion of the convex portion, and the fixing force of the valve body is weak. Since the valve body is stretched along with it, and the fixing force of the valve body is weak, the above-mentioned extra stretch and deformation occur, and the breakage pressure varies.

[0014]

As is apparent from the above description, according to the present invention, the dish-shaped sealing plate having the valve element and the reinforcing plate fixed thereto is preliminarily constructed, and the dish-shaped sealing plate and the terminal cap are interposed by the insulating packing. Since the opening of the battery case is bent inward to form a sealing structure, the valve body will not be broken when sealing, etc.
It is possible to provide a method for manufacturing an organic electrolyte battery which is free from damage and can improve work efficiency.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an organic electrolyte battery according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a conventional organic electrolyte battery.

FIG. 3 is a diagram showing the operation of the valve body according to the embodiment of the present invention.

FIG. 4 is a diagram showing an operation of a conventional valve body.

[Explanation of symbols]

 1 Dish-shaped sealing plate 1a Valve hole 1b Peripheral rising part 1c Perimeter horizontal flat part 2 Terminal cap 2a Cutting edge 2b Perimeter horizontal flat part 3 Valve body 4 Reinforcing plate 5 Battery case 6 Electrode group A Sealing plate B Sealing plate

Claims (1)

[Claims] 1. A positive electrode, a power generation element composed of a light metal negative electrode and an organic electrolyte are provided in a battery case, and a dish-shaped sealing plate is provided in an opening of the battery case. The dish-shaped sealing plate is on the battery case side. A valve hole is provided on the bottom surface protruding to the inside of the dish-shaped sealing plate, and a valve body that closes the valve hole from the inside of the dish-shaped sealing plate and a ring-shaped reinforcing plate disposed on the upper surface of the valve body rises around the dish-shaped sealing plate. A method for manufacturing an organic electrolyte battery in which a plate-shaped sealing plate is pre-configured by fixing the valve body and a reinforcing plate by crimping the part inward, the battery-side protruding bottom surface of the plate-shaped sealing plate and the power generating element The step of fitting the electrically conductive lead piece to be connected to the insulating packing pre-engaged with the battery case, and the cutting edge facing the valve disc on the upper surface of the rising edge of the peripheral edge of the dish-like sealing plate. Engaging the provided terminal cap, and Organic electrolytes preparation of cells and a step of nipped the peripheral flat portion of the terminal cap, and a dish-like sealing plate with an insulating packing by bending the opening inwardly of.