JPH03262697A - Ic card fitted with battery - Google Patents

Abstract

PURPOSE:To increase the capacity of a battery and to extend the use period of an IC card fitted with the battery by arranging the battery on the entire surface of a reinforcing plate and arranging other electric parts thereon and expanding the volume of the battery. CONSTITUTION:A battery 2 is arranged on a reinforcing plate 1 and various electric parts 17 and wirings 6 are arranged thereon through an insulating layer 26. The terminals 27, 28 of the battery 2 pierce the insulating layer 26 to be connected to the wirings 6 and polymer films 18, 19 are arranged to the surface and the rear of the laminated structure. A lower anode 22a and an upper cathode 23a are arranged in the battery 2 so as to hold an electrolyte 21 therebetween. At the part where the thick electric parts 17 are arranged, the cathode 23a and a part of the fixed electrolyte 21 thereunder are removed to suppress the thickness of the whole and the overlap arrangement of the thick electric parts 17 and the battery 2 are made possible. Since the volume for the battery within an IC card having fixed volume can be increased, the capacity of the battery can be increased and the use period of the IC card fitted with the battery can be extended.

Description

[Detailed Description of the Invention] [Summary] An IC that has a built-in battery and can drive a display device, etc.
Regarding the card, the purpose is to provide an IC card that can be used for a long time. The thin plate-like battery has an anode plate, a cathode plate, a solid electrolyte sandwiched between the two electrode plates, and an electrode electrically connected to the two electrode plates, one of which is led out through the solid electrolyte. and a pair of battery terminals.

The present invention relates to an IC card, and more particularly to an IC card that has a built-in battery and can drive a display device or the like.

"Prior Art" An IC card containing an integrated circuit (IC) can write and read various information in addition to its role as an ID card, so it can be used in the same way as a bank passbook, for example.

In order to check the deposited amount, it is preferable to have an IC card or a display device.If a display device is provided, electric power is required to drive it, and a battery is required to be built in.

Figures 2 (A) and (B) show examples of conventional IC cards with batteries.
It has dimensions of mm, width 80mm, and height 55mm.

As shown in the cross-sectional structure of FIG. 2(A), a T-cell 12 such as a paper lithium battery, electrical components 17 such as a key bat, a display device, and an LSI are mounted on a reinforcing plate 11 made of metal or the like that provides physical support. Then, an electrical connection is formed using wiring 16. Both sides of the basic structure constructed in this way are covered with polymer films 18 and 19 to provide decorations and the like.

FIG. 2(B) shows a plan view with one polymer film on the front side removed, showing an LS 113 on the reinforcing plate 11 that has a recording function and an arithmetic function, and a liquid crystal display (LCD) that has a function to display numbers, etc. Display device 14 such as LCD), numeric keypad and A,
A key bat 15 including a letter P key, etc. is arranged together with a battery 12, and a wiring 16 connects them. battery 12
Since the electric parts 17 such as the LS 113, the display device 14, and the key bat 15 are arranged within a certain area, the area for the battery 12 is limited. Due to thickness limitations, the capacity of the battery is small, making it difficult to use an IC card for a long period of time. Furthermore, since the battery cannot be replaced, it has been impossible to extend the usage period of the battery-equipped IC card.

In order to realize a compact electronic circuit unit with high packaging density, it is necessary to attach a flip-chip type IC chip to at least one side of a card-shaped battery, which is a positive electrode and a negative electrode, through a thin metal plate. An electronic circuit unit has been proposed in which a wiring board is layered on top of this IC chip, and the electrode on the opposite side of the battery is connected to the wiring board by stirring the side of the battery (Japanese Patent Application Laid-Open No. 1983-1991). -15
If this structure is used in an IC card, electrode wiring that detours around the sides tends to become a problem, and IC chips are limited to those having one electrode on the bottom surface.

3 Invention or Section U to be Solved] As explained above, conventional IC cards with batteries have a short period of use.

The object of the present invention is to provide an IC that can extend the period of use.
We may provide a card.

[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention. By overlapping the battery and other electrical components in the same area, the volume available for the battery is increased and the capacity of the battery is increased.

In FIG. 1, a battery 2 is placed on the entire surface of a reinforcing plate 1. The battery 2 is provided with a pair of battery terminals 7.8 electrically connected to the battery's polar plates, one of which extends through the battery's electrolyte. A half-S# device 3, wiring 6 connecting the semiconductor device and the battery terminal, and the like are arranged above the battery 2. Other display devices 4, key bats 5, etc. may be arranged and connected.

In areas where electrical components such as the semiconductor device 3, display device 4, keypant 5, etc. are arranged, if necessary, one electrode plate, etc. is cut out to reduce the thickness of the battery 2, thereby reducing the overall thickness. to a given value.

7. If the electrical components and batteries are placed flat within a limited area, the area allocated to the batteries will be limited, or the batteries 2 may be placed on the entire surface of the reinforcing plate 1. By arranging other electrical components thereon, the volume of the battery 2 can be maximized. By increasing the volume of the battery, the capacity of the battery can be increased and the period of use of the battery-equipped IC card can be extended.

The terminal structure penetrates the inside of the battery, and by providing a pair of battery terminals on one side of the battery, the wiring length can be shortened and the I
An IC card can be formed with a clean peripheral part of the C card.

First Embodiment The basic structure of a thin plate battery such as a paper lithium battery used in an IC card or the like will be explained with reference to FIG.

Anodes 2 formed of a predetermined material on both sides of the solid electrolyte 21
2. When the cathode 23 is brought into contact with the solid electrolyte to cause an electrochemical reaction, an overall electromotive force is generated due to the difference in electromotive force between the two electrode plates. Normally, these anode 22 and cathode 2
The surface of 3 is further coated with a metal support 24,25. By creating a thin plate-like structure in this manner, a thin plate-like battery can be provided. The capacity of a battery is determined by the solid electrolyte contained within the battery.
It is determined by the volume of 1. That is, in order to increase the capacity of the battery, it is necessary to increase the volume of the solid electrolyte 21.

FIGS. 4(A) and 4(B) are diagrams for explaining an IC card according to an embodiment of the present invention.

FIG. 4(A) shows the planar structure of a thin plate battery. Pond 2 has an area almost equal to the area of the IC card to be created, and as shown by the broken line above it, LSI 3, LCD, etc. Electrical components such as a display device 4 and a key bat 5 are arranged therein. Note that a pair of terminals 27 and 28 protrude upward from the battery.

One is the positive electrode and the other is the negative electrode.

FIG. 4(B) is a partial cross-sectional view showing the cross-sectional structure of the IC card. A battery 2 is placed on a reinforcing plate 1 made of metal or the like, and various electric components 17 and arrangements are placed thereon via an insulating layer 26! 6 is placed.

The terminals 27 and 28 of the battery pass through the insulating layer 26 and connect to the wiring layer 6.
It is connected to the. Polymer films 18 and 19 are arranged on the front and back surfaces of these laminated structures. Printing or the like is applied to the polymer films 18 and 19 as necessary. Note that inside the battery 2, a positive electrode 122a is placed on the lower side with the electrolyte 21 in between, and a cathode 23a is placed on the upper side. Note that these anodes and cathodes include an anode and a cathode, respectively, and a metal support for performing an electrochemical reaction. If the anode and cathode have sufficient strength, the metal support may be omitted. The terminal 28 of one battery is the anode 22a.
It penetrates the solid electrolyte 21 and is led out to the upper surface. The other battery terminal 27 is connected to the cathode 23a on the top surface. The upper structure of the battery is cut out in the area where the thick electrical component 17, which may be provided with more than one set of such battery terminals if necessary, is located.

That is, the cathode 23a and a portion of the fixed electrolyte 21 below it have been removed. In this way, the overall thickness is suppressed and the thick electrical component 17 and battery 2 can be arranged in an overlapping manner. Solid electrolyte 2 placed under electrical component 17
1a does not have a cathode 23a directly above it, but
It acts as an electrolyte in a battery by passing current in the lateral direction.

In this way, as shown in the planar configuration of FIG. 4 (A>), by using a battery that has a recess in the place where the electrical component is to be stored, the entire predetermined size can be met.
It becomes possible to arrange the battery on the entire surface of the reinforcing plate. For example, if the total thickness is 0.76 mm and Fig. 4 (A
The depth of each recess is set so that a semiconductor device, a display device, and a keypad can be placed in the portions 3, 4, and 5 indicated by broken lines.

As explained above, by arranging the battery on the entire surface of the reinforcing plate, it becomes possible to use a space that could not be used until now as a space for the battery, and the capacity of the battery can be increased.

In addition, in the example, the case where the anode is arranged on the lower side and the cathode on the upper side is explained, but the anode and cathode can be reversed! In addition, although a semiconductor device, a display device, and a key bat have been described as electrical components used together with one battery, connection terminals for terminals and other electrical components may also be stored together if necessary.

Although the present invention has been described above along with examples, the present invention is not limited to these.

For example, it will be obvious to those skilled in the art that various changes, improvements, combinations, etc. are possible.

εEffect of the Invention] As explained above, according to the present invention, an IC of a constant volume
This allows for increased volume for batteries within the card.
It is possible to increase the capacity of the battery and extend the usage period of the battery-equipped IC card.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIGS. 2 (A) and (B) are diagrams for explaining a conventional IC card with a battery, and FIG. 2(B) is a plan view showing the planar arrangement, FIG. 3 is a sectional view showing the structure of the thin plate battery, and FIG. 4(A)
, (B) are diagrams for explaining the IC card according to the embodiment of the present invention, FIG. 4 (A) is a plan view showing the planar configuration of the battery, and FIG. 4 (B) is a cross-sectional structure of the IC card. FIG. In the figure, 1 2 3 4 5 6 7 18.19 1 2 3 24.25 6 Reinforcement board battery Semiconductor device (L Display device key bat wiring Wiring reinforcement board battery SI Display device key bat wiring Electrical parts Polymer film Solid # Electrolyte Il Poles Cathode metal support insulating layer 1 27, 8 Engraving of battery terminal drawings Fig. 1 6 (B) Planar arrangement Fig. 3 (B) Cross-sectional structure of IC card Fig. 4 Procedure auxiliary device (method) 1. Display of the case 1990 Patent Application No. 63280 2, Name of the invention IC card with battery 3, Person making the amendment Address related to the case (522) Name

Claims (2)

[Claims] (1), comprising a reinforcing plate (1), a thin plate-shaped battery (2) formed on the entire surface of the reinforcing plate, a semiconductor device (3) disposed on the battery, and wiring (6), The thin plate-like battery (2) has an anode plate, a cathode plate, a solid electrolyte sandwiched between the two electrode plates, and a 1 electrode electrically connected to the both electrode plates, one of which is led out through the solid electrolyte. An IC card with a battery including a pair of battery terminals (7, 8). (2) In claim 1, one of the anode plate and the cathode plate has a pattern-shaped cutout, and the semiconductor device is arranged on the pattern-shaped cutout. IC card with battery.