JPH05114395A - Flat type power source element - Google Patents

Abstract

PURPOSE:To decrease the thickness of a lead terminal as well as a bonding layer so as not to remarkably increase the thickness of a power source element due to installation of the lead terminal. CONSTITUTION:A first and a second lead terminals 21, 22, which are electrically continued to a first and a second case half bodies 3, 4 by a first and a second conductive members 27 and 28 joined to each other via a sealing member 5, are fixed respectively to the first and second case half bodes 3, 4 through a first and a second adhesive layers 23, 24. It is possible to install the lead terminals after a flat type power source element is assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device such as an electric double layer capacitor or a battery, and more particularly, to an improvement in the structure of external terminal means in a flat power supply device having a case having a flat shape as a whole. It is about.

[0002]

2. Description of the Related Art A lithium battery or an electric double layer capacitor is suitable as a power source for an IC card, which has been developed in recent years, and these power source elements have a thin shape, that is, a flat type.

As an example of a flat type power supply element suitable for an IC card power supply, there is one having a structure shown in FIG. 6 or 7. In these drawings, the structure of a so-called "paper lithium battery" or a structure corresponding thereto is shown.

The flat type power supply element 1 shown in FIG. 6 has a case 2, and the case 2 has first and second case halves 3 and 4 made of a metal plate or foil such as stainless steel. These first and second case halves 3
The peripheral portions of 4 and 4 are joined to each other via a sealing material 5 made of an organic material such as a heat-adhesive film, whereby a case 2 having a sealed structure is provided. Inside the case 2, the first and second functional substances 6 and 7 are arranged with a separator 8 containing an electrolytic solution interposed therebetween. First and second functional substances 6 and 7
Is a positive electrode active material and a negative electrode active material when the flat type power supply element 1 is a battery, and first and second polarizable electrodes when it is an electric double layer capacitor.

In such a structure, the first case half 3 and the second case half 4 are electrically insulated from each other by the sealing material 5, and the first case half 3 is also provided.
Is in electrical contact with the first functional substance 6, and the second
The case half 4 of is in electrical contact with the second functional material 7. Therefore, the first and second case halves 3 and 4 function as first and second external terminal means, respectively.

FIG. 7 shows a flat type power supply element 1a having another structure.
It is shown. In FIG. 7, elements corresponding to those shown in FIG. 6 are designated by the same reference numerals, and redundant description will be omitted. The flat type power supply element 1a shown in FIG.
Has a structure substantially similar to that of the flat type power supply element 1 shown in FIG. 6, although the first and second case halves 3 and 4 and the sealing material 5 have different shapes.

The flat type power supply element 1 or 1 as described above
When a is mounted on a circuit board, the configuration as shown in FIG. 8 is most typically adopted. Note that FIG. 8 illustrates the flat type power supply element 1 illustrated in FIG. 6.

Referring to FIG. 8, circuit board 9 is provided with contact pieces 10 and 11, and contact pieces 10 and 1 are provided.
While elastically sandwiching the power supply element 1 between the contact pieces 10,
And 11 are in contact with different external terminals of the power supply element 1, that is, the first and second case halves 3 and 4.

However, in the structure shown in FIG. 8, the presence of the contact pieces 10 and 11 makes it difficult to thin the power supply section including the power supply element 1, and the contact pieces 10 and 11 are added to the power supply element 1. Since the pressure may not be sufficiently strong, there is a problem that the reliability of electrical connection is low.

As a solution to the above-mentioned problems, a flat type power supply element 12 as shown in FIG. 9 has been proposed (Japanese Utility Model Laid-Open No. 61-162948). In the power supply element 12 shown in FIG. 9, as shown in the figure, the welded portion 13 is attached to each of the first and second case halves 15 and 16 joined via the sealing material 14 to the lead terminal 17. And 18 are attached by a method such as spot welding.

When such a power supply element 12 is built in an electronic device, the tips of the lead terminals 17 and 18 are soldered to a circuit board. With such a structure, the power supply unit can be made thinner than the structure shown in FIG.

[0012]

However, the structure shown in FIG. 9 also has a problem to be solved.

That is, when the lead terminals 17 and 18 are previously attached to the first and second case halves 15 and 16 by spot welding or the like, the process for assembling the power supply element 12 becomes extremely complicated.

On the other hand, when the lead terminals 17 and 18 are mounted after the power supply element 12 is assembled, considerable pressure and heat are applied during spot welding, so that the case halves 15 and 16 are deformed and the sealing material 14 is heated. It is easily damaged and leads to a decrease in sealing performance. For this reason, in the power supply element 12 shown in FIG. 9, a wide portion is provided in the sealing material 14 to make it less susceptible to heat damage, and the lead terminals 17 and 18 are provided.
Is thickened to reduce the concentration of welding electrode pressure. However, these make it difficult to miniaturize and thin the power supply element 12 including the lead terminals 17 and 18 (lower the height).

Therefore, the object of the present invention is, for example, as shown in FIG.
Alternatively, it is an object to provide a flat type power supply device in which lead terminals are attached to the flat type power supply device, which is basically provided with the structure shown in FIG. 7 and which does not cause a significant increase in thickness. ..

[0016]

The present invention, like the flat type power supply element 1 or 1a shown in FIG. 6 or 7, is made of a metal extending along opposing first and second main surfaces, respectively. It is directed to a flat type power supply element that includes first and second case halves and a sealing material that joins the peripheral portions of the first and second case halves to each other.

In such a flat type power supply device, in order to solve the above-mentioned technical problems, the first and second electrically conductive members are respectively connected to the first and second case halves.
The lead terminal is attached to at least one of the first and second case halves by an adhesive layer.

The electrical continuity between the first and second case halves and the first and second lead terminals described above can be achieved, for example, by applying a conductive paste, interposing a conductive adhesive film, or by a case. Pressure contact between the half body and the lead terminal,
And the like.

The above-mentioned adhesive layer is preferably provided by a heat-adhesive resin film.

[0020]

According to the present invention, the first and second lead terminals electrically connected to the first and second case halves are mechanically held by the first and second lead terminals.
It is achieved by being attached to at least one of the case halves by an adhesive layer.

[0021]

According to the present invention, since the lead terminal is attached by the adhesive layer, the lead terminal can be attached after the flat type power supply element is assembled. Therefore, the process for assembling the flat type power supply element can be prevented from becoming complicated.

Further, since it is not necessary to apply spot welding or the like when attaching the lead terminal, as described above,
There is no need to provide a wide portion in the sealing material or thicken the lead terminals. Therefore, by reducing the size of the flat type power supply element and thinning the adhesive layer, it is possible to prevent a large increase in the thickness of the power supply element due to attachment of the lead terminal.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention. In FIG. 1, (a) is a perspective view and (b) is
FIG. 4B is a sectional view taken along the line BB in (a). The flat type power supply element 20 shown here is, for example, an electric double layer capacitor or a battery, and directly includes the elements included in the flat type power supply element 1 shown in FIG. Therefore, FIG.
In FIG. 6, elements corresponding to those shown in FIG. 6 are designated by the same reference numerals, and redundant description will be omitted. Note that this also applies to the embodiments shown in FIGS. 2 to 5 described later.

Referring to FIG. 1, power supply element 20 includes first and second lead terminals 21 and 22. These first and second lead terminals 21 and 22 are formed by the first and second adhesive layers 23 and 24, respectively.
It is attached to the first and second case halves 3 and 4. The first lead terminal 21 and the adhesive layer 23 are provided with a first opening 25 penetrating therethrough, and the second lead terminal 22 and the adhesive layer 24 are also provided with a second opening 26.
Is provided. First and second conductive members 27 and 28 are loaded in these openings 25 and 26, respectively. As a result, the first and second case halves 3 and 4 are electrically connected to the first and second lead terminals 21 and 22, respectively.

The above-mentioned adhesive layers 23 and 24 are preferably thin, flat, and have high adhesive strength, and are made of, for example, a hot-melt type heat-adhesive film. More specifically, the thickness is 0.040
A hot-melt type heat-adhesive film made of mm-mm ethylene-vinyl acetate copolymer resin can be advantageously used.

As the conductive members 27 and 28,
From the viewpoint of workability, a conductive resin paste to which powder of silver, nickel, copper, carbon, etc. is added is advantageously used.

In order to obtain such a flat type power supply element 20, thermal bonding to be the first and second adhesive layers 23 and 24 is provided on the outside of each of the first and second case halves 3 and 4. The first and second lead terminals 21 and 22 are overlapped with each other via a flexible film, and the lead terminals 21 and 22 are fixed to the case halves 3 and 4 by heating while being pressed from above. At this time, the adhesive layers 23 and 24 and each part of the lead terminals 21 and 22 are
The openings 25 and 26 are provided.

Next, the openings 25 and 26 described above are filled with, for example, a silver paste to be the conductive members 27 and 28, and the case halves 3 and 4 and the lead terminals 21 and 2 are filled.
2 and 2 are conducted respectively.

FIG. 2 shows a second embodiment of the present invention. In FIG. 2, (a) is a perspective view and (b) is
FIG. 4B is a sectional view taken along the line BB in (a).

In the flat type power supply element 30 shown in FIG. 2, the first and second lead terminals 31 and 32 are connected to the first and second lead layers 31 and 34 by the conductive first and second adhesive layers 33 and 34. Mounted on case halves 3 and 4, respectively. The conductive adhesive layers 33 and 34 can be provided by, for example, a conductive heat-adhesive film or adhesive.

FIG. 3 shows a third embodiment of the present invention. In FIG. 3, (a) is a perspective view,
(B) is sectional drawing which follows the line BB of (a).

The slit 4 is formed in each part of the first and second lead terminals provided in the flat type power supply element 40 shown in FIG.
3 and 44 are provided. Adhesive films are used as the first and second adhesive layers 45 and 46, with the first and second lead terminals 41 and 42 being in contact with the first and second case halves 3 and 4, First
The lead terminals 41 and 42 are respectively bonded to the case halves 3 and 4 by bonding an adhesive film to be the second adhesive layers 45 and 46 from the outside of the lead terminals 41 and 42 onto the case halves 3 and 4, respectively. It is fixed in a state of being pressed into contact with and is also electrically connected. Slits 43 and 44 existing in the lead terminals 41 and 42
Makes it possible for the adhesive film to enter into them as well, so that the pressure contact state of the lead terminals 41 and 42 with respect to the case halves 3 and 4 is more firmly maintained.

In the first to third embodiments described above, the two lead terminals are arranged vertically in order to show the mounting structure of the lead terminals in an easily understandable manner. It is preferable that the positions of these two lead terminals are displaced from each other in the plane direction.

FIG. 4 shows a fourth embodiment of the present invention. In FIG. 4, (a) is a perspective view,
(B) is sectional drawing which follows the line BB of (a), and (c).
FIG. 7A is a cross-sectional view taken along the line CC of FIG.

In the flat type power supply element 50 shown in FIG. 4, the first and second lead terminals 51 and 52 are led out in a state of being arranged on the same plane.

The end portion of the first lead terminal 51 is joined to the peripheral portion of the first case half body 3 via the insulating first adhesive layer 53, and the first and second lead terminals 51 are formed. The case halves 3 and 4 are folded back at their peripheral portions, and the middle part thereof is joined to the second case half 4. The first lead terminal 51 and the first adhesive layer 53 are pierced so that the first
The opening 54 is provided, and the first conductive member 55 is applied to the opening 54 to electrically connect the first lead terminal 51 and the first case half body 3.

The second lead terminal 52 is the second adhesive layer 5
It is joined to the second case half 4 via 6. The second lead terminal 52 and the second adhesive layer 56 are provided with a second opening 57 penetrating the second lead terminal 52 and the second adhesive layer 56. The two case halves 4 are electrically connected.

FIG. 5 shows a fifth embodiment of the present invention. In FIG. 5, (a) is a perspective view,
(B) is sectional drawing which follows the line BB of (a), and (c).
FIG. 7A is a cross-sectional view taken along the line CC of FIG.

In the above-described first to fourth embodiments, the lead terminals are formed of independent metal plates or foils, whereas in the flat type power supply element 60 according to the fifth embodiment, The first and second lead terminals 61 and 62 are provided by conductors on the flexible circuit board 63. The flexible circuit board 63 is connected to the second case from the peripheral portion of the first case half body 3 via the insulating adhesive layer 64.
It is joined so as to extend to the main surface portion of the case half body 4.

The flexible circuit board 63 and the adhesive layer 6 are provided at a position facing the peripheral portion of the first case half body 3.
4 is provided with a first opening 65 penetrating therethrough. The opening 65 is provided with a first conductive member 66, which electrically connects the first lead terminal 61 on the flexible circuit board 63 and the first case half 3 to each other. On the other hand, at a position facing the second case half body 4, the flexible circuit board 63 and the adhesive layer 64 are provided with a second opening 67 penetrating therethrough. In this opening 67, the second
The conductive member 68 is added to electrically connect the second lead terminal 62 on the flexible circuit board 63 and the second case half body 4 to each other.

[Brief description of drawings]

1A and 1B show a flat type power supply element 20 according to a first embodiment of the present invention, FIG. 1A is a perspective view, and FIG. 1B is a sectional view taken along line BB in FIG. 1A.

2A and 2B show a flat type power supply element 30 according to a second embodiment of the present invention, FIG. 2A is a perspective view, and FIG. 2B is a sectional view taken along line BB in FIG. 2A.

3A and 3B show a flat type power supply element 40 according to a third embodiment of the present invention, FIG. 3A is a perspective view, and FIG. 3B is a sectional view taken along line BB in FIG. 3A.

FIG. 4 shows a flat type power supply element 50 according to a fourth embodiment of the present invention, (a) is a perspective view, (b) is a sectional view taken along line BB of (a), c) is the line C- of (a)
It is sectional drawing which follows C.

FIG. 5 shows a flat type power supply element 60 according to a fifth embodiment of the present invention, (a) is a perspective view, (b) is a sectional view taken along line BB of (a), c) is the line C- of (a)
It is sectional drawing which follows C.

FIG. 6 is a central cross-sectional view showing a conventional flat type power supply element 1.

FIG. 7 is a central cross-sectional view showing another conventional flat type power supply element 1a.

8 is a sectional view showing a mounting structure of the flat type power supply element 1 shown in FIG.

FIG. 9 is a conventional flat type power supply device 1 capable of improving a mounting state.
It is a perspective view showing 2.

[Explanation of symbols]

3 1st case half body 4 2nd case half body 5 Sealing material 20, 30, 40, 50, 60 Flat type power supply element 21, 31, 41, 51, 61 1st lead terminal 22, 32, 42, 52,62 Second lead terminal 23,24,33,34,45,46,53,56,6
4 Adhesive layers 27, 28, 55, 58, 66, 68 Conductive members

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masato Higuchi 2 26-10 Tenjin Tenjin, Nagaokakyo City, Kyoto Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A first and a second case halves made of metal respectively extending along opposing first and second main surfaces, and peripheral portions of the first and second case halves, respectively. In a flat type power supply element comprising a sealing material that is bonded to each other, the first and second lead terminals electrically connected to each of the first and second case halves have the first and second lead terminals connected by an adhesive layer. A flat type power supply element characterized by being attached to at least one of the second case halves.