JPS60165043A - Manufacture of flat type battery - Google Patents

Abstract

PURPOSE:To obtain a battery with high reliability by forming glass layers at the peripheral section of metal plates that comprise positive and negative electrode plates and overlapping both glass layers so as to be made to touch each other while a power generating element is being inserted in the central area thereof, then heating both layers of glass to be welded each other. CONSTITUTION:A glass layer 3b is formed on a negative electrode plate 2 from the peripheral end to the inside except the section in which the continuity with the negative electrode 6 in the central part is provided. A glass layer 3a is formed on the inner surface side peripheral section of a positive electrode plate 1. A nickel ribbon 7 is placed on the negative electrode 6 of a power generating element formed on the positive electrode plate 1 and the negative electrode plate 2 is overlapped on the positive electrode plate 1 so that the glass layer 3b and the glass layer 3a formed on the positive electrode plate 1 can be made to touch each other. Then, while a battery is being pressurized, the peripheral section of the battery is irradiated with YAG laser and the glass is melted, then the glass layers 3a and 3b are welded and sealed.

Description

[Detailed Description of the Invention] [Technical Field and Objectives] The present invention relates to an improvement in the manufacturing method of a thin sealed battery, which is ultra-thin, has excellent sealing properties and insulation properties, and is highly reliable for long-term use. The purpose is to provide a sealed battery.

[Background technology]

A conventional thin sealed battery has a positive electrode plate 1 as shown in FIG.
A power generation element and a ceramic spacer 1 are placed between the negative electrode plate 2 and the negative electrode plate 2.
1, and bonded the ceramic spacer 11 and the electrode plate with solder 12 and 13. However, the thickness of the spacer used for insulation between the electrode plates is generally thicker than the metal plate used for the positive electrode plate and the rice electrode plate, and the thickness of the metallizing layer and the solder layer on the surface of the spacer are also added. However, this structure did not allow the battery to be made extremely thin and could not be applied to applications such as thin memory cards.

Therefore, resin sealing may be considered in order to achieve ultra-thinness, but even if ultra-thinness can be achieved by doing so, current technology does not allow for the sealing of the resin sealing part or the gas permeability of the resin itself. However, there were problems with the performance and reliability for long-term use.

[Summary of the invention]

The present invention solves the above-mentioned drawbacks of the prior art, and involves forming a glass layer on the periphery of a metal plate that will become a positive electrode plate and a negative electrode plate. The glasses are stacked so that their shells are in contact with each other and sealed by heating and welding the glass to each other, resulting in an ultra-thin, airtight, highly insulating battery that is highly reliable for long-term use. be.

〔Example〕

FIG. 1 is a sectional view showing an example of a thin sealed battery manufactured by the method of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the battery shown in FIG. 1 during manufacture.

The battery according to this embodiment is a solid thin film secondary battery, and in the figure, 1 is a positive electrode plate made of a 5US430 plate, 2 is a negative electrode plate made of a 5US430 plate, 3 is a glass layer, 4 is a positive electrode made of a Ti32 thin film, and 5 is a solid The electrolyte layer 6 is a negative electrode made of a lithium thin film, and 7 is a nickel ribbon for establishing electrical conduction between the negative electrode 6 and the negative electrode plate 2.

Details of this battery and its manufacturing method are as follows.

The negative electrode plate 2 has a thickness of 0.1 mm, and when manufacturing the battery, as shown in FIG. Approximately 50μm
Glass JW3b is formed with a thickness of .

The glass constituting the above glass N3b is B203-PbO
This glass has a melting point of about 430°C and a coefficient of thermal expansion of about 105 Xl0-7/'c. To form the glass layer 3b on the negative electrode plate 2, the negative electrode plate 2 is heated in an electric furnace at a width of about 800°C.
The surface of the negative electrode plate 2 is oxidized in advance by heating for 0 minutes, and the glass powder is applied to the area where the glass layer is to be formed, and heated to 1000°C in a nitrogen atmosphere in an electric furnace to form the glass into the negative electrode plate. This was done by welding it to. The reason why the glass IW 3b on the negative electrode side is formed not only at the periphery of the negative electrode plate 2 but also over the center part compared to the positive electrode side is that the glass layer 3b prevents contact between the negative electrode plate 2 and the positive electrode 4 from inside. This is to prevent the occurrence of short circuits, and if the short circuits are prevented by other means (for example, polyimide resin coating), the glass layer 3b
The peripheral edge of the negative electrode plate 2 alone is sufficient.

Like the negative electrode plate 2, the positive electrode plate 1 is made of 5US with a thickness of 0.1 mm.
430 plate, and a 8203=8203 plate with a thickness of about 50 μm is formed on the inner peripheral edge of the plate using the same method as for the negative electrode side.
A PbO-based glass layer 3a is formed. - This positive electrode plate 1 also serves as a substrate for a thin film battery, and by masking the glass N3a, a T with a thickness of approximately 50 μm is placed on the positive electrode plate 2 using a chemical paper depositillon method.
A thin film of iS2 is formed as a positive electrode 4, and then Li4Si04- with a thickness of about 10 μm is deposited on the positive electrode 4 by sputtering.
An amorphous thin film of Li3PO4 is formed to form the solid electrolyte layer 5, and then a layer of about 10 μm thick is formed by vapor deposition on top of the solid electrolyte layer 5.
A thin film of lithium was formed to form a negative electrode 6.

A nickel ribbon 7 with a thickness of 30 μm is placed on the negative electrode 6 of the power generation element formed on the positive electrode plate 1 in this way, and the central part of the nickel ribbon 7 and the negative electrode plate 2 where no glass layer is formed is placed. The negative electrode plate 2 was stacked on the positive electrode plate l so that the glass N3b and the glass N3a formed on the positive electrode plate 1 were in contact with each other.

Ggi Ima mm + nrx + f? Jk<? -VA/-
1,,w/LIJ force 10W, speed 40mm/sec
) along the outer periphery of the battery to melt the glass and weld and seal the glass IW 3a and the glass layer 3b.
A battery as shown in the figure was manufactured. Note that the glass N3 in FIG. 1 is formed by welding the glass N3a formed on the positive electrode plate 1 and the glass 1mJ3b formed on the negative electrode plate 2.

Since the melting point of glass is significantly lower than that of the metal constituting the electrode plates, the glasses can be welded together by low-power laser heating, so that the positive electrode plate 1 and the negative electrode plate 2 were not melted at all during welding. In addition to laser heating, a plasma arc or the like can be used as the heating means, but in view of the thermal effect on the battery contents, it is most preferable to use a laser that can locally heat the battery.

When the airtightness of the obtained battery was measured using a helium leak detector, it was found that the leakage was IXXl0-9at・cc.
/sec-air or less, and the airtightness was high. Moreover, the total thickness of the obtained battery was about 0.3 mm, and it was extremely thin.

The insulation resistance between the positive electrode plate 1 and the negative electrode plate 2 of this battery is 50
When measured with an insulation resistance needle to which a DC voltage of 0.0 cm was applied, the resistance was 1000 MΩ or more, indicating high insulation properties.

〔Effect of the invention〕

As described above, the present invention provides a battery that is ultra-thin, has excellent sealing properties and insulation properties, and is highly reliable for long-term use.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a thin sealed battery manufactured by the method of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the battery shown in FIG. 1 during manufacture. FIG. 3 is a sectional view showing a conventional thin sealed battery. DESCRIPTION OF SYMBOLS 1... Positive electrode plate, 2... Negative electrode plate, 3... Glass layer, 3a... Glass layer, 3b... Glass layer, 4...
...Positive electrode, 5...Solid electrolyte, 6...Negative electrode Patent applicant Hitachi Maxell Co., Ltd. Agent Patent attorney Tetsuo Miwa 1 Government 1 Figure 62 Figure 62''+?3 Figure

Claims (1)

[Claims] (11) A glass layer is formed on the periphery of a metal plate serving as a positive electrode plate and a negative electrode plate, and the metal plates are stacked so that the glass layers are in contact with each other with a power generation element interposed in the center. A method for manufacturing a thin sealed battery, characterized in that the thin sealed battery is sealed by heating and welding the glasses together. (2) The thin sealed battery according to claim 1, wherein the heating is performed by laser heating. Production method.