JP3334722B2 - Laminated thin battery and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated thin battery structure for obtaining a high battery capacity and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, this type of battery has a plurality of single thin batteries connected in parallel as shown in FIG. 1, but with such a structure, it is difficult to connect and hold the battery to equipment using the battery. In addition, there are problems such as a large number of manufacturing steps and an increase in the thickness of the battery.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to easily produce a thin battery having a high battery capacity and to reliably and easily attain current collection. Is what you do.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a laminated thin battery in which thin film batteries are laminated, wherein an electrode plate A holding an active material on an inner surface is folded inward, and The electrode plate B holding the active material on both surfaces except for the end of the electrode plate B is arranged inside the folded electrode plate A, and the periphery of each electrode plate A is sealed with a sealing agent. A sealing material is placed on the periphery of the plate A and the inside folded portion, and a sealing agent is placed on the front and back of the side of the electrode plate B holding the active material on both sides except for one end, and the electrode plate B Is folded with the electrode plate A, and the periphery of the electrode plate is sealed under reduced pressure, or after the electrode plate B is folded with the electrode plate A, they are concentrically wound or repeatedly bent in a bellows shape, and the peripheral portion is folded. Sealing material, zinc or zinc-tin alloy on at least the back surface of the electrode plate A and the end of the electrode plate B The electrode plate A and the electrode plate B were assembled as described above, concentrically wound, the ends of the electrode plate A were integrated, and the side surfaces or the ends of the electrode plate B were integrated. The problem is solved by assembling the electrode plate B as described above, repeatedly bending the electrode plate B in a bellows shape, integrating the end portion of the electrode plate A, and integrating the side surface or the end portion of the electrode plate B. .

[0005]

A positive electrode active material (or a negative electrode active material) is held on the inner surface of the positive electrode plate A (or the negative electrode plate), and a sealing material is held on the inner periphery and center as shown in FIG. Further, after the negative electrode active material (or the positive electrode active material) is held on both surfaces except one side of the negative electrode plate B (or the positive electrode plate), the electrolyte is held on the active material surface. Next, the positive electrode plate A is bent at the center, the negative electrode plate B is disposed between the bent portions, the electrode plates are adhered to each other via a sealing agent, and sealed to obtain a laminated battery.

[0006]

EXAMPLES The details of the present invention will be described below with reference to examples. Figure 2 shows a laminated thin battery (eg, lithium battery)
In the schematic diagram before assembling, a negative electrode active material 1 (lithium, carbon) is coated on an inner surface of a negative electrode plate (10-micron thick stainless steel) A, and an electrolyte is held. The sealing material 3 was bonded to the peripheral portion including the sealing material. Next, the positive electrode active material 4 was placed on both sides of the positive electrode plate (10 micron thick stainless steel) B.
And sealing materials 3 were bonded to both sides of the end portion 5 of the electrode plate. Next, the negative electrode plate A is folded inward as shown by the arrow,
In the meantime, the positive electrode plate B is arranged. FIG. 4 is an enlarged sectional view showing a state in which the sealing agent portion of the battery is heat-sealed under reduced pressure. Note that solder 6 is attached to the bent end of the negative electrode plate A.
(Zinc, zinc-tin alloy, lead-tin alloy, etc.)
The solder 7 is also coated on the tip of the positive electrode plate B. The thickness of the thin battery thus obtained is about 50 microns.
At about 200 microns, the battery capacity was twice that of the prior art (in this case, about 220 mAh) and the thickness was 0.8 times the same battery capacity. If everything is performed by a vapor deposition method, the thickness can be further reduced.

FIG. 4 shows a perspective view of a cylindrical battery in which the above-mentioned thin battery is wound concentrically (a spiral shape) and an enlarged view of an upper part of the cylindrical battery. FIG. 5 is a partially enlarged cross-sectional view taken along the line AA ′ of FIG. 4, in which the solder 7 at the tip of the positive electrode plate B and the solder 6 at the bent end of the negative electrode plate A are integrated.

Furthermore FIG. 6 is a perspective view of a battery folded repeatedly the thin batteries bellows, FIG. 7 is a partially enlarged cross-sectional view of B-B 'section, the positive electrode plate B tip of the solder 7 and the negative electrode plate A
Are integrated with the solder 6 at the bent end portion. These integrated parts are used as terminal parts of the battery. In addition, if the sealing material is sealed under the reduced pressure after being wound concentrically (or spirally) or repeatedly folded in a bellows shape, the sealing agent is sealed, which occurs at the time of winding or folding. There is no distortion (wrinkles) of the inner and outer electrode plates, and the sealing effect is enhanced.
This effect increases as the thickness of the electrode plates A and B increases.
In other words, wrinkles are generated inside the bent portion when rolled or folded, but after the generation, they are sealed, so that the sealing agent penetrates into the inside of the wrinkles and is sealed, thereby maintaining airtightness.

[0009] The stacked thin-film battery and the large-capacity stacked thin-film battery configured as described above are thin and lightweight, and the ID card, I
It can be used for C cards, portable electronic devices, electric vehicles and the like.

[0010]

According to the present invention, the battery can be easily mounted on the device, and the battery can be stored by utilizing the gap between the printed circuit board and the lid in the device. (For example, in the case of a memory card, ID card, etc., the number of memories, etc.) is improved. For large capacity, the industrial value is extremely large, for example, the interval between the electrode plates is small, the calorific value at the time of discharge can be reduced, and it is easy to load on an electric vehicle by connecting in series and parallel in the manner of a dry battery. is there.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional thin battery and a stacked battery in which a plurality of thin batteries are stacked.

FIG. 2 is an assembly view of the laminated thin battery of the present invention.

FIG. 3 is a cross-sectional view of the laminated thin battery of the present invention.

FIG. 4 is a perspective view of a battery in which a laminated thin battery of the present invention is spirally wound.

FIG. 5 is a sectional view taken along the line A-A ′ of FIG. 4;

FIG. 6 is an assembly view of a battery obtained by folding the laminated thin battery of the present invention into a bellows shape.

FIG. 7 is a sectional view taken along the line B-B 'of FIG.

[Explanation of symbols]

1 the anode active material 2 plate center fold 3 sealing agent 4 positive electrode active material 5 electrode plate end portion 6, 7 solder A negative electrode plate B positive electrode plate of the

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01M 6/00-6/22 H01M 10/00-10/40

Claims (6)

(57) [Claims] In a laminated thin battery in which thin film batteries are stacked, an electrode plate A holding an active material on an inner surface is folded inward, and an electrode plate holding an active material on both surfaces except for one edge is provided. The tip of the plate B is the electrode plate A
A laminated thin-film battery in which the electrodes A are disposed inside the folded portions of the electrode plates A so as to protrude from the peripheral edges, and the peripheral edges of the respective electrode plates A are sealed with a sealing agent except for the end portions . 2. An electrode plate A having an active material held on its inner surface, a sealing material disposed on a peripheral edge and an inner folded portion, and the above-mentioned "one side" of an electrode plate B having an active material held on both surfaces except for one end. The end of
Wherein a sealing agent is arranged on the front and back of the portion except for the tip portion, the electrode plate B is folded with the electrode plate A so that the tip portion protrudes, and the periphery of the electrode plate is sealed under reduced pressure. Manufacturing method for thin batteries. Zinc end tip of at least the back surface and electrode plate B of wherein electrode plates A, zinc - tin alloy or lead - laminated thin battery according to claim 1, wherein the coated tin alloy. 4. The electrode plate A and the electrode plate B are assembled as described above and concentrically wound, and the end portion of the electrode plate A is integrated, and the side surface or the end portion of the electrode plate B is integrated. The laminated thin battery according to claim 1 or 3, wherein: 5. The electrode plate A and the electrode plate B are assembled as described above, and further bent repeatedly in a bellows shape to integrate the end portion of the electrode plate A and to integrate the side surface or the end portion of the electrode plate B. The laminated thin battery according to claim 1 or 3, wherein: 6. An electrode plate B holding an active material on its inner surface, a sealing material disposed on a peripheral edge and an inner folded portion, and excluding one end portion of the electrode plate B holding said active material on both surfaces. The end of
After the sealing agent was placed on the front and back of the portion excluding the tip portion, the electrode plate B was folded with the electrode plate A so that the tip portion protruded , and then concentrically wound or repeatedly bent in a bellows shape. Thereafter, the peripheral edges of the electrode plates B and A are sealed under reduced pressure.