TECHNICAL FIELD The present invention relates to a thread-type flexible battery, more precisely a thread-type flexible battery that can be transformed into various forms in necessary and easily connected to an instrument from outside thereof by having a shape of a thread.

BACKGROUND ART •

Conventional battery having a cylinder-type had a prescribed shape and size such as AA or AAA and the other forms of conventional battery are coin cell having shape of coin and cell having shape of hexahedron, and the like.

Once the battery is produced and th,en marketed, it is impossible to change the shape of battery. Therefore, it should be used as its shape at producing time, and also there should be pre-prepared a space for the instrument using a battery to receive it.

For example, it is fixed a shape of battery in watch, battery in cellular phone, and battery in camcorder.

The above conventional cylinder-type, coin-type, angular-type battery can not be transformed freely since these batteries have its particular shape, therefore there

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is problem that it is not able to transform freely to match with usage of battery.

DESCRIPTION OF DRAWINGS Other objects and aspects of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawing in which:

Figure 1 is a preparing flowchart for a thread-type battery produced by coating all electrode and electrolyte according to preferable embodiment of the present invention. Figure 2 is a cross-section view of thread-type battery produced by said Figure 1.

Figure 3 is a preparing flowchart for a thread-type battery produced by coating inside electrode and then putting in a high molecule case having an empty inside, and by coating outside electrolyte according to preferable embodiment of the present invention.

Figure 4 is a cross-section view of thread-type battery produced by said Figure 3.

^Explanation for mark among drawing

1, 11: current collector of inside electrode

2, 12: inside electrode

3, 13: electrolyte 4, 14: outside electrolyte

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5, 15: outside current collector

6, 16: protecting coating part 100, 200: thread-type battery

DISCLOSURE OF INVENTION

TECHNICAL PROBLEM

Therefore, the present invention is to solve a conventional problem, it is an object of the invention to provide a thread-type flexible battery being capable of transforming freely into various forms in necessary and using by easily connecting to an instrument from outside thereof.

TECHNICAL SOLUTION

The above-mentioned object of the present invention can be achieved by forming an inside electrode by coating electrode material at periphery side of inside current collector, and coating electrolyte at the outside of the inside electrode, and forming an outside electrode by coating electrode material at periphery side of the electrolyte, and then depositing an outside electrolyte and a protecting coating part to protect the periphery side of the outside electrolyte from a moisture and an air.

BEST MODE

The present invention will be described in detail by preferable embodiments with reference to the accompanying drawing as the following description. In the present invention, the term of "thread-type" means what has a various shape of cylinder, hexahedron and the like, but its length is higher than cross section (High aspect ratio) , and the flexible form. Also, the thread-type battery of the present invention has a form such as thread and a function of battery.

Figure 1 is an example of a preferable preparing process of a thread-type battery of the present invention, consisted of following steps; a step (Sl) forming an inside electrode by coating electrode material at periphery side of inside current collector, a step (S2) coating electrolyte at the outside of the inside electrode, a step (S3) coating outside electrode at periphery side of the electrolyte, and a step (S4) re-coating an outside electrolyte and a protecting coating part at periphery side of said outside electrolyte.

The above each step (Sl, S2, S3, S4) is constructed with formation of an inside electrode (2) by coating electrode material at periphery side of inside current

collector (1) being capable of bended or flexed, and coat of electrolyte (3) at the outside of said inside electrode (2) and re-coat of another electrode material at periphery side of the electrolyte (3) . Namely, a thread-type battery (100) is produced by using coating technique that coat electrode material and electrolyte material on a thin and lengthy current collector, and the thread-type battery (100) is shaped whose equivalent diameter is below 1 cm, and length is more 5 times than diameter. Also, at the above each step (Sl, S2, S3, S4), a coating technique of electrode and electrolyte for producing a thread-type battery can be selected from dry- type method such as melt-injection and hot dipping, vacuum evaporation, sputtering, ion plating, molecular beam epitaxy, chemical vapor deposition method using heat, light and plasma, clad, or wet-type method using chemical, and electrochemical method, and pasting method coating directly.

The above current collector (1, 5) can be selected from conventional current collector having a good elastic property consisted with alloy metals such as TiNi system, pure metals such as copper, aluminium, pure metal coated with carbon, conductible material such as carbon, carbon fiber-, conducting polymer such as polypyrrole, and polymer with conductor. Its shape is suitable for as thread.

At the above inside electrode (2) and outside electrode (4), outside electrode (4) is positive electrode provided that inside electrode (2) is negative electrode, it can be contrary case. As the above negative electrode material, a conventional negative electrode material such as metals comprising lithium, sodium, zinc, magnesium, cadmium, hydrogen storage alloy, lead, and the like, nonmetals comprising carbon and the like, and electrode material comprising organo-sulfur and the like is preferable.

As the above positive electrode material, a conventional positive electrode material such as sulfur and metal sulfide, lithium transition metal oxide comprising LiCoO ₂ and so forth MnO ₂ , Ag ₂ O, NiCl ₂ , NiOOH, polymer electrode and the like is preferable. The above negative electrode material and positive electrode material are preferably prepared by using powder, slurry using powder, solution, or prepared to thin layer shape using coating.

The above electrolyte (3) is reacted to exchange an ion of battery each other between inside electrode (2) and outside electrode (4), and it is preferable to use a conventional electrolyte such as organic solvent comprising EC, PC, TG, liquid electrolyte, or water soluble electrolyte comprising KOH, NaOH match to electrode material, and porous polymer electrode of gel phase, or

solid phase using PEO, PVdF, PMMA, PAN, PVAC and so forth, solid electrode comprising sulfides, LiPON, oxides sulfides and so forth, as the above electrolyte (3).

Figure 2 is a cross-section view of thread-type battery produced by Figure 1, and a construction of thread- type battery through deposition together with a producing process of Fig. 1 is illustrated as following.

To an inside current collector (1), an inside electrode (2) is prepared by coating electrode material at periphery side of inside current collector (1) through a step Sl among steps of a producing process of Fig. 1, and, electrolyte (3) is coated to periphery side of inside electrode (2) through a step S2 among steps of a producing process of Fig. 1, and outside electrode (4) is formed by coating and depositing electrolyte material at periphery side of said electrolyte (3) through a step S3 among steps of a producing process of Fig. 1.

Finally, a thin outside current collector (5) and a protecting coating part (6) is coated to a periphery side of the above outside electrode (4) through a step S4 among steps of a producing process of Fig. 1 to protect the electrolyte from a moisture and an air, thereby being formed a inside structure of thread-type battery (100).

Figure 3 is another preferable embodiment showing a preparing process for a thread-type battery of the present

invention, produced by coating inside electrode and then putting in a high molecule case having an empty inside, and by coating outside electrolyte, and it is consisted of following steps; a step (SlI) forming an inside electrode by coating electrode material at periphery side of inside current collector, a step (S12) inserting said inside electrode in an inside of electrolyte of an hollow cylinder, a step (S13) coating outside electrode at periphery side of said electrolyte, and a step (S14) coating an outside electrolyte or a protecting coating part at periphery side of said outside electrolyte. At the above each step (SIl, S12, S13, S14), a coating method of an electrode and an electrolyte for producing a thread-type battery is the same as the method described in

Fig. 1.

Figure 4 is a cross-section view of thread-type battery produced according to a producing process shown at said Figure 3, and a construction of thread-type battery produced by inserting an inside electrode in an electrolyte according to a producing process of Fig. 3 is illustrated as following.

An inside electrode (12) is prepared by coating electrode material at inside current collector (11) through a step SlO among steps of a producing process of Fig. 3. The inside electrode (12) prepared at the above step is inserted in a cylinder electrolyte (13) . At this inserting procedure, it is inserted such that a periphery side of said prepared inside electrode (12) coincide with an inside of said cylinder electrolyte (13) .

Finally, an outside electrode (14) is formed by coating another electrolyte material at surface of electrolyte, and a thin outside current collector (15) and a protecting coating part (16) is coated to a periphery side of the above outside electrode (14) to protect the battery from a moisture and an air.

ADVANTAGEOUS EFFECTS

The thread-type flexible battery according to the above-described present invention can be used as battery of necklace cord form of necklace-type PDA, cellular phone and so on, thereby providing an effect enabling to use an instrument by providing a power with necklace cord itself without inserting a battery into said instrument. It is also possible to make a changeable battery such as cloths form by weaving the thread-type battery of the present invention with radial form or twisted form, therefore the

present invention is very useful since it can be adapted in various industry.