JPS62262369A - Flat cell - Google Patents

Abstract

PURPOSE:To acquire a flat cell with a large electric capacity,and with a simple electrical connection of the electrode terminals and the other elements, by composing the periphery of one side terminal plate projecting and extending from the outer brim of the end of a frameform insulator. CONSTITUTION:The flat cell 21 has positive and negative electrode terminals, and the negative electrode terminal plate 25 is formed to have a formation and size projecting from the outer brim of an insulating sealing member 4. The negative electrode plate 25 is closely attached to a resin sheet 13 to be a card base concurrently, and, since it is extended up to under a circuit sheet 12, the distance between the circuit sheet 12 and the terminal plate 25 is very short, so that the electrical connection of the both members is very easy, simply with a lead terminal 24, for example. Therefore, a card base plate and a lead terminal for the negative electrode terminal, which were necessary in a conventional IC card, are now disused, and the space in the card in the thickness direction can be taken sufficiently, resulting in the increase of the electrical capacity of the cell.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a flat battery, and more particularly, to a flat battery.

The present invention relates to a flat battery that has a large electrical capacity and has an hourly wheel electrically connected to a 7-channel pond and other elements, and is particularly useful as a power source built into a card-type electronic device.

[Prior Art] In recent years, as electronic devices such as electronic desktop calculators and electronic wristwatches have become smaller and thinner, there has been an increasing demand for the development of extremely thin, flat batteries. Among them, card-type electronics such as card-type calculators and IC cards! li! As a power source for 7Ji, an ultra-thin battery with a thickness of 1 ms or less is desired.

Hitherto, as such a flat battery, a battery as shown in FIG.
(see Publication No. 232), that is.

In the figure, a negative electrode sheet 1 and a positive electrode mixture sheet 2 are laminated with a separator 3 in between to form a power generation unit. A frame-shaped insulator 4 is disposed surrounding the power generation unit made of this laminate, and covers one end surface of the insulator 4 and the lower surface of the negative electrode sheet 1, and covers the negative electrode terminal plate 5.
However, a positive electrode terminal plate 6 is formed in close contact with the other end surface of the insulator 4 and the upper surface of the positive electrode mixture sheet 2, for example, through an adhesive, thereby configuring a flat battery 11. The frame-shaped insulator 4 and the positive and negative terminal plates 5 and 6 hermetically seal the entire battery.

FIG. 4 is a longitudinal sectional view showing a state in which the flat battery 11 described above is built into a card-type electronic device. That is, a circuit sheet 12 on which a flat battery 11 and other elements such as an integrated circuit chip (not shown) are mounted is sandwiched between resin sheets 13 and 13° made of vinyl chloride, etc. 13 and 13° are adhered to each other with an adhesive or their peripheral edges are heat-sealed to form a card as a whole. Then, the positive and negative terminals 5 and 6 of this flat battery 11 and the circuit sheet 12''-
The circuit chip is a lead terminal 1 with elasticity, respectively.
4 and 15 are electrically connected.

Furthermore, in such card-type electronic devices, the card may be subject to stress and bend during transportation or use, and as a result, elements such as integrated circuits within the card may lose their functionality. This will cause inconvenience. Therefore,
Usually, as shown in FIG. 4, a base body 16 made of a thin metal plate is inserted into the card to increase its strength, thereby preventing the card from curving as much as possible.

[Problems to be solved by the invention] The size of the flat battery used in such card-type electronic devices cannot be increased unnecessarily due to the relationship with other elements in the card. Therefore, the electric capacity is mainly determined by the thickness of the positive electrode mixture sheet and the negative electrode sheet. However, as is clear from FIG. However, there is a problem in that it is difficult to achieve sufficient capacitance. Furthermore, it is structurally complex, as two lead terminals are required for connection with other elements.

The present invention solves such conventional problems, and in particular provides a flat battery built into a card-type electronic device, which has a large electric capacity, and also allows easy electrical connection between the electrode terminals of the battery and other elements. The purpose is to provide a simple flat battery.

[Means and Effects for Solving the Problems 1] As a result of intensive research to achieve the above object, the inventors of the present invention have increased the size of one of the positive and negative terminal plates of a flat battery. In order to complete the present invention, it was confirmed that if the terminal board and the card base were to be combined, the full capacity of the battery could be achieved, and the terminals could be easily removed. It has arrived.

That is, in the flat battery of the present invention, a positive electrode mixture sheet, a separator, and a negative electrode sheet are arranged in this order with a frame-shaped insulating sealing body; covering the entire surface of the positive electrode mixture sheet and one end face of the insulating sealing body; , a positive terminal plate in close contact with these;
In a flat battery consisting of a negative electrode terminal plate that covers the entire surface of the negative electrode sheet and the other end face of the insulating sealing body and is in close contact with these, the peripheral edge of one terminal plate is located on the end face of the frame-shaped insulator. It is characterized by a structure in which it protrudes and extends from the outer edge.

As described above, the flat battery of the present invention is characterized by the dimensions of one of the positive and negative terminal plates, and the constituent materials of each component are not particularly limited.

Hereinafter, the basic structure of the flat battery of the present invention will be explained based on FIGS. 1 and 2. In addition, Figures 3 and 4
Components that are the same as those in the figure are given the same reference numerals. The flat pond 21 shown in FIG. 1 has such a shape and dimensions that the negative terminal plate 25 of the positive and negative terminals protrudes from the outer edge of the insulating sealing body 4. In other words, the negative terminal 25 must be large enough to be used as a card body.For example, in the case of an IC card, the width is 53.92 mm according to the International Organization for Standardization (ISO).
~54.03m layer, length 85.47~85.72a+s
Therefore, the width of the negative terminal plate 25 is 54.0
3a+■ or less, and the length is preferably 85.72mat or less. On the other hand, in order for the negative terminal plate 25 to sufficiently function as a card base and prevent the card from curving, the width should be 2.
It is preferable that the length is 4.03 mm or more and the length is 55.721111 or more.

FIG. 2 is a longitudinal cross-sectional view showing the above-described flat battery 21 of the present invention built into a card-type electronic device. In the present invention, the negative terminal plate 25 is brought into close contact with the resin sheet 13'. Since the negative terminal plate 25 also serves as a card base and extends below the circuit sheet 12, the distance between the circuit sheet 12 and the terminal plate 25 is extremely small. , for example, can be easily performed using the lead terminal 24.

Furthermore, by incorporating the flat battery of the present invention, a fourth
The card base 16 and negative terminal lead terminal 14 required in the conventional IC card shown in the figure are no longer necessary, and a larger space in the thickness direction within the card can be obtained, thereby increasing the electric capacity of the battery. becomes possible. Specifically, 1. For example, if the total thickness of the battery is 0.5+sm, the thickness of the positive and negative electrode terminal plates is 0.05 m each, and the thickness of the lead terminal plate is 0.10 mm, the electric capacity is approximately 15 mm. % increase.

Although we have described here a configuration in which the negative electrode terminal plate of a flat battery also serves as the card base, the configuration is not limited to this, and the same effect can be obtained even if the configuration is such that the positive electrode terminal plate also serves as the card base. can get. Further, the shape of the upper pond surrounded by the insulating sealant is not particularly limited, and may be rectangular.

The terminal plate may have any shape such as a circular shape or an L-shape, and a portion of these terminal plates may be slightly extended outward to attach the lead terminals.

[Example] A flat battery of the present invention as shown in FIG. 1 was manufactured.

That is, this battery is suitable for an IC card with a thickness of 0.76 mm having the structure shown in Fig. 2, and has lithium as the negative electrode sheet 1, manganese dioxide as the positive electrode mixture 2, and a conductive material. A mixture of graphite as an agent and polytetrafluoroethylene as a binder is laminated with a separator 3 interposed therebetween, and is layered on the lower surface of the negative electrode sheet 1 to a thickness of 0.5 mm.
A stainless steel negative electrode terminal plate 25 with a diameter of 0.05 mm and the same dimensions as the IC card specified by the ISO standard, that is, 54 m x 85 m5, is glued, and the same thickness is 0.05 mm on the top surface of the positive electrode mixture 2.
．． A stainless steel positive electrode terminal plate 6 of 20n+m x 40mm was bonded with 05a+m. Next, a frame-shaped insulating body 4 made of a heat-fusible resin, for example, an ionomer resin, is arranged between the two electrode terminal plates 1 and 25, and these are heat-treated at 180°C. The entire battery was sealed with
8 was subjected to a constant load discharge of Ω, its discharge capacity I
I'L was 54.4 mAh.

For comparison, the thickness was 0.76, which is the same as in the example described above.
rmtn IC card, but when we manufactured a conventional flat battery for ICC cards having the structure shown in Figure 4, i.e., a flat-shaped battery as shown in Figure 3, the overall thickness of the battery was was 0.4 m+s, and the discharge time during constant load discharge of 68Ω was 46.3 mAh.

[Effects of the Invention] As is clear from the above description, the flat battery of the present invention can be used as a built-in power source in a card-type electronic device having a predetermined thickness, and can be made thicker than conventional batteries. 1, the air capacity increases significantly. In addition, electrical connections with other elements within the card can be easily made.
Its industrial value 4fi is extremely high.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing an example of the present configuration of a flat 1z type battery of the present invention, and FIG.
FIG. 3 is a vertical cross-sectional view showing an example of a conventional IC card with a conventional structure. FIG. 4 is a longitudinal sectional view of an IC card incorporating the flat battery of FIG. 3. ■... Negative electrode sheet, 2... Positive electrode mixture sheet, 3...
・Separator, 4... Frame-shaped insulating sealing body, 5.25...
・Negative terminal plate, 6...Positive terminal plate, ]2...Circuit sheet, 13.13°...Resin sheet, 14.15.2
4...Lead terminal. Figure 2

Claims (2)

[Claims] (1) A laminate in which a positive electrode mixture sheet, a separator, and a negative electrode sheet are laminated in this order; a frame-shaped insulating sealing body surrounding the laminate; the entire surface of the positive electrode mixture sheet and the insulating sealing body; a positive electrode terminal plate that covers one end face of the negative electrode sheet and is in close contact with the same; and a negative electrode terminal plate that covers the entire surface of the negative electrode sheet and the other end face of the insulating sealing body and is in close contact with these. . A flat battery characterized in that a peripheral edge of one terminal plate is configured to protrude and extend from an outer edge of an end surface of the frame-shaped insulator. (2) The dimensions of the terminal plate protruding from the outer edge of the end surface of the insulating sealing body are 24.03 to 54.03 mm in width and 55.72 mm in length.
The flat battery according to claim 1, which has a length of 85.72 mm.