WO2015012599A2 - Pouch for flexible battery and flexible battery using same - Google Patents

Abstract

The present invention relates to a pouch for a flexible battery and a flexible battery using the same, wherein an exterior material of the pouch has a structure in which a reinforcing film member, a moisture permeation and electrolyte leakage prevention film and a thin film for bonding are stacked.

Description

Pouch for flexible battery and flexible battery using same

The present invention relates to a flexible battery, and more particularly, to a flexible battery pouch and a flexible battery using the same, which enables an ultra-thin structure and improves moisture permeation prevention efficiency.

Recently, the demand for mobile electronic devices such as mobile phones, laptops, digital cameras, etc. is constantly increasing, the demand for thin energy storage devices is also rapidly increasing.

As the thin energy storage device, a secondary battery is used, and the use of a lithium secondary battery capable of driving high energy density and high output among secondary batteries is increasing.

Examples of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, and lithium secondary batteries. In particular, the lithium secondary battery has a high utilization because it has a higher energy density per unit weight and a faster charge than the other secondary batteries such as lead storage batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries.

Among these secondary batteries, lithium ion batteries using a liquid electrolyte are used in the form of a welding seal using a metal can as a container, and a can type secondary battery using a metal can as a container has a fixed shape, thus limiting the design of electrical products. There is a difficulty in reducing the volume.

Recently, a pouch type secondary battery using two electrodes, a separator, and an electrolyte in a pouch and sealing is developed and used.

Meanwhile, as mobile electronic devices become thinner and smaller, secondary batteries having a cylindrical battery or a square battery structure mainly using existing metal cans are not applied to mobile electronic devices, and secondary batteries using pouches as exterior materials are used.

Pouch type secondary battery can be manufactured in various forms and has the advantage of realizing high energy density per mass. However, unlike the metal can type, since the soft pouch is used as the exterior material, the mechanical strength is weak and the peeling of the aluminum thin film and the polymer resin layer may occur, thereby reducing the reliability of the sealing.

In addition, quality control (QC) during mass production is difficult and despite the high-strength pouch can be somewhat disadvantageous for mechanical shock.

Korean Patent Laid-Open Publication No. 10-2013-0063709 includes a pouch of a battery, which is formed of an inner resin layer, a metal foil layer, and an outer resin layer, and has a buffer layer that is less reactive than the metal foil layer on a surface where the inner resin layer and the metal foil layer are in contact with each other. A packaging material has been disclosed, and by further forming a buffer layer that is less reactive than the metal foil layer, it prevents the oxidation reaction of the metal foil layer even when damaged, such as micro cracks in the inner resin layer, thereby preventing battery pouch exterior material. Although there is an advantage to prevent the corrosion of the prior art, the pouch exterior material is made of an inner resin layer, a buffer layer, a metal foil layer, an outer resin layer, and the buffer layer is at least one metal selected from copper, silver, platinum and gold. As a result, the pouch packaging material has a problem in that it is made of a resin layer and a metal layer, thereby failing to obtain a moisture permeability to satisfy high reliability.

In addition, Korean Patent Laid-Open No. 10-2013-0081445 discloses an aluminum layer; An outer layer formed on the first surface of the aluminum layer; A first adhesive layer bonding the aluminum layer and the outer layer; An inner layer including a crosslinked polymer layer formed on a second surface of the aluminum layer; And it is disclosed an aluminum pouch film for secondary batteries comprising a second adhesive layer for bonding the aluminum layer and the inner layer, the aluminum layer is exposed to the outside of the pouch is easily scratched by physical contact, the aluminum layer is bent There are disadvantages to losing.

In addition, Korean Patent Laid-Open Publication No. 10-2013-0014252 discloses a pouch type secondary battery in which an electrode assembly is accommodated in an outer packaging material. When the pouch is bent, the packaging material and the electrode assembly are not integrated. As a result, the degree of bending and position may be different when a large number of bends occur, and damage such as cracks may occur.

Such prior art is difficult to meet the high quality flexible battery characteristics that can be applied to the recent high performance mobile electronic devices.

Disclosure of Invention An object of the present invention is to provide a flexible battery pouch and a flexible battery using the same, by implementing a pouch having a laminated structure having excellent interlayer adhesion, and prevent the occurrence of wrinkles and cracks in the pouch during bending.

Another object of the present invention is to provide a flexible battery pouch and a flexible battery using the same by forming a pouch with an electrode integrated body to enable an ultra-thin battery, excellent flexibility and moisture permeation prevention efficiency.

Still another object of the present invention is to provide a flexible battery pouch and a flexible battery using the same by impregnating the gel polymer electrolyte in the pores of the separator to prevent gas leakage and leakage when bending.

Still another object of the present invention is to provide a pouch for a flexible battery and a flexible battery using the same, in which deformation does not occur even when bending is performed.

In order to achieve the above object, a pouch for a flexible battery according to an embodiment of the present invention, a pouch for a flexible battery including an electrode assembly, a separator and a packaging material for receiving and sealing the electrolyte, the packaging material is a reinforcing film member , A moisture penetration and electrolyte leakage preventing film, and a structure in which a thin film for bonding is laminated.

To achieve another object of the present invention, a flexible battery pouch is a flexible battery pouch including an electrode assembly, a separator and a sealing material for receiving and sealing an electrolyte, wherein the packaging material includes: a PTFE (Polytetrafluoroethylene) layer; And a bonding thin film laminated on the PTFE layer.

In addition, the flexible battery according to an embodiment of the present invention, the positive electrode assembly and the negative electrode assembly disposed opposite each other; A separator disposed between the anode assembly and the cathode assembly; A pouch for receiving and sealing the positive electrode assembly, the negative electrode assembly, and the separator; And an electrolyte solution injected into the pouch.

In the present invention, the exterior material of the pouch is implemented as a structure in which a reinforcing film member and a moisture penetration and electrolyte leakage preventing layer are stacked, so that an ultra-thin pouch and a flexible battery can be implemented and the moisture permeation prevention efficiency can be improved.

In the present invention, the interlayer adhesion of the laminated structure of the pouch is excellent, and wrinkles and cracks can be prevented from occurring during bending.

In the present invention, the exterior of the pouch and the electrode are integrated to implement a flexible battery having an ultra-thin thickness and at the same time improve the moisture permeation prevention efficiency.

In the present invention, by adding a PTFE component to the active material, it is possible to prevent the active material from peeling from the current collector and to prevent cracking inside the active material.

In the present invention, the PTFE layer having excellent chemical resistance, abrasion resistance, heat resistance, and flexibility may be included in the pouch case to prevent wrinkles generated during bending.

1 is a cross-sectional view of the exterior material of the flexible battery pouch according to the first embodiment of the present invention;

2 is a cross-sectional view of a modification of the packaging material of the flexible battery pouch according to the first embodiment of the present invention;

3 is a schematic cross-sectional view of a flexible battery according to a first embodiment of the present invention;

4 is a flowchart of a method of manufacturing a flexible battery according to a first embodiment of the present invention;

5 is a view for explaining a method of manufacturing a flexible battery according to a first embodiment of the present invention;

6 is a flowchart of a method of manufacturing a flexible battery according to a second embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view for describing a sealing process of preventing cracking in an exterior member of a flexible battery according to a first embodiment of the present invention; FIG.

8 is a schematic cross-sectional view of a full cell structure of a flexible battery according to the present invention;

9 is a schematic cross-sectional view of the bicell structure of the flexible battery according to the present invention.

10 is a cross-sectional view of the exterior material of the flexible battery pouch according to the second embodiment of the present invention;

11 is a cross-sectional view of a modification of the packaging material of the flexible battery pouch according to the second embodiment of the present invention;

12 is a cross-sectional view of the exterior material of the flexible battery pouch according to the third embodiment of the present invention;

13 is a cross-sectional view of the exterior material of the flexible battery pouch according to the fourth embodiment of the present invention;

14 is a cross-sectional view of the exterior material of the flexible battery pouch according to the fifth embodiment of the present invention;

15 is a cross-sectional view for explaining another structure of the polymer substrate applied to the exterior material of the flexible battery pouch according to the fourth and fifth embodiments of the present invention;

16 is a plan view for explaining a pouch applied to the flexible battery according to the fourth and fifth embodiments of the present invention;

17 is a view for explaining a method for assembling a flexible battery using a flexible battery pouch according to the fourth and fifth embodiments of the present invention;

18 is a conceptual perspective view of a watch phone having a flexible battery according to a fourth and fifth embodiment of the present invention;

19 is a view illustrating a state in which a flexible battery is embedded in a watch band of a watch phone according to the fourth and fifth embodiments of the present invention;

20 is a conceptual cross-sectional view illustrating a coupling relationship between a flexible battery and a watch phone body according to the fourth and fifth embodiments of the present invention;

FIG. 21 is a conceptual plan view illustrating a flexible battery embedded in a watch band of a watch phone according to the fourth and fifth embodiments of the present invention; FIG.

22 is a conceptual perspective view for explaining that the detachable watch band is combined with the watch phone according to the fourth and fifth embodiments of the present invention;

23 is a cross-sectional view of the exterior material of the flexible battery pouch according to the sixth embodiment of the present invention;

24 is a cross-sectional view of an exterior member of a flexible battery pouch according to a seventh embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail for the practice of the present invention.

Referring to FIG. 1, the exterior material of the pouch of the flexible battery according to the first embodiment of the present invention includes a reinforcing film member 100a and a moisture permeation and electrolyte leakage preventing film 100b.

The reinforcing film member 100a is a flexible substrate for implementing a pouch case having a laminated structure. The reinforcing film member 100a is positioned outside the pouch to reinforce the strength of the pouch, and scratches are generated by the physical contact applied from the outside. It is to protect the pouch from external force, such as to prevent it. The reinforcement film member 110 may use one of a polyethylene terephthalate (PET) film, a cyclo olefin polymer (COP) film, and a polyimide (PI) film.

The moisture permeation and electrolyte leakage preventing layer 100b prevents moisture from penetrating into the pouch from the outside of the pouch, and at the same time, serves to block leakage of the electrolyte located inside the pouch. The moisture penetration and electrolyte leakage preventing film 100b is preferably made of a metal material, and more preferably, the moisture penetration and electrolyte leakage preventing film 100b may be made of a material made of Cu or Al. At this time, Cu or Al does not react with the electrolyte solution.

Here, the exterior material of the pouch of the flexible battery according to the present invention has a structure laminated in the same state as a flexible copper clad laminate (FCCL) in which copper foil is bonded on a thin plastic or polymer film, reinforcing film member ( 100a) and the adhesion of the moisture penetration and electrolyte leakage preventing film 100b is excellent.

That is, the moisture penetration and electrolyte leakage preventing film 100b is bonded to the reinforcing film member 100a with an adhesive and laminated with a metal film, a metal coating film coated on the reinforcing film member 100a, and an electrolytic plating on the reinforcing film member 100a. It may be formed of one of the metal plating film.

For example, when the reinforcing film member 100a is a PI film and the moisture permeation and electrolyte leakage preventing film 100b is a metal film, a method of laminating a PI film and a metal film with an adhesive, and a PI varnish on the metal film Adhesion by three methods: coating to form and hardening (varnish) to form a metal coating layer, vacuum deposition of a metal seed layer on the PI film and electroplating to form a metal plating film. This excellent pouch packaging material can be produced.

In addition, the thickness t of the outer packaging material of the pouch of the flexible battery of the present invention is preferably 20 to 30 µm and has an ultra-thin shape. In this case, the thickness t1 of the reinforcing film member 100a and the thickness t2 of the moisture penetration and electrolyte leakage preventing film 100b may be the same or different, and preferably, the thickness t1 of the reinforcing film member 100a. And the thickness (t2) of the moisture penetration and electrolyte leakage preventing film (100b) is preferably designed in the range of 10 ~ 20㎛.

Referring to FIG. 2, the packaging material of the pouch of the first exemplary embodiment of the present invention may include a reinforcing film member 100a, a moisture penetration and electrolyte leakage preventing film 100b, and a bonding thin film 100c. That is, the thin film 100c for bonding is further formed in the moisture permeation and electrolyte leakage prevention film 100b.

The bonding thin film 100c is used to manufacture a pouch in an encapsulation form by bonding two exterior materials, and a CPP (casting polypropylene) film may be used.

Therefore, in the present invention, since the exterior material of the pouch is configured to include the reinforcing film member 100a, the moisture penetration and the electrolyte leakage preventing film 100b, it is possible to implement an ultra-thin pouch and a flexible battery, and improve the moisture permeation prevention efficiency. have.

In addition, in the present invention, the reinforcing film member 100a and the adhesion of the moisture penetration and the electrolyte leakage preventing film 100b are excellent, and wrinkles and cracks can be prevented from occurring in the pouch during bending.

In addition, the flexible battery according to the present invention having the pouch described above includes a positive electrode assembly and a negative electrode assembly disposed opposite each other; A separator disposed between the anode assembly and the cathode assembly; The aforementioned pouch for receiving and sealing the positive electrode assembly, the negative electrode assembly and the separator; And an electrolyte solution injected into the pouch. Here, the electrolyte may be a gel polymer electrolyte.

In this case, the separator of the flexible battery includes a porous nonwoven fabric having fine pores; And a nanofiber web stacked on one side or both sides of the porous nonwoven fabric and formed of a spinable polymer material.

The positive electrode assembly of the flexible battery includes a positive electrode current collector; And an electrode formed by coating a positive electrode active material on the positive electrode current collector. The negative electrode assembly may include a negative electrode current collector; And an electrode formed by coating a negative electrode active material on the negative electrode current collector.

The positive electrode current collector may include a copper deposition film or a Cu deposition film deposited on the bonding thin film, and the negative electrode current collector may include an Al foil or an Al deposition film deposited on the bonding thin film.

In addition, the pouch of the flexible battery may include a receiving portion accommodating the electrode assembly and a sealing portion at the edge, and the boundary portion of the receiving portion and the sealing portion may be bent in a round shape.

Referring to FIG. 3, in the flexible battery according to the first embodiment of the present invention, a cathode current collector 210 is deposited, and a cathode active material 211 is coated on the cathode current collector 210. Exterior material 101; The negative electrode current collector 220 is deposited, and the negative electrode current collector 220 is coated with the negative electrode active material 221, and is bonded to the first exterior material 101 to bond the positive electrode active material 211 and the negative electrode. A second exterior member 102 forming a space between the active materials 221; It is located in the space, the electrolyte membrane or the separator 250 is provided with a plurality of pores in which the electrolyte is moist.

In the flexible battery according to the first embodiment, a positive electrode current collector 210 and a positive electrode active material 211 are deposited and coated on a first outer material 101, and a negative electrode current collector 220 is disposed on a second outer material 102. And since the negative electrode active material 221 is deposited and coated, it is possible to realize a flexible battery having an ultra-thin thickness without the need for a separate electrode assembly and the electrode of the pouch is integrated with the electrode.

In addition, in the present invention, the first exterior member 101 in which the positive electrode current collector 210 and the positive electrode active material 211 are integrated, and the second exterior material 102 in which the negative electrode current collector 220 and the negative electrode active material 221 are integrated. ) To form a pouch, which can improve the bending property (i.e. flexibility) of the pouch compared to a general pouch in which the pouch and the electrode are separated, and prevent deformation such as wrinkles generated during bending. There is an advantage to this.

In addition, the edges of the first exterior member 101 and the second exterior member 102 are bonded to each other to form a pouch in which a space is formed in the center region of the first exterior member 101 and the second exterior member 102, and in the space of the pouch. The separator 250 and the electrolyte are inserted and accommodated.

Here, the electrolyte is preferably a gel polymer electrolyte in a gel state moistened in the pores of the separation membrane 250, and can improve leakage of the existing liquid electrolyte, and in particular, prevent gas or leakage from being generated during bending. Can be.

The cathode active material 211 includes a cathode active material capable of reversibly intercalating and deintercalating lithium ions. Representative examples of the cathode active material include LiCoO ₂ , LiNiO ₂ , LiNiCoO ₂ , LiMnO ₂ , and LiMn ₂ O. ₄ , V ₂ O ₅ , V ₆ O ₁₃ , LiNi _1-xy Co _x M _y O ₂ (0 ≤ x ≤ 1, 0 ≤ y ≤ 1, 0 ≤ x + y ≤ 1, M is Al, Sr, Mg And lithium-transition metal oxides such as metals such as La and the like, and one of NCM (Lithium Nickel Cobalt Manganese) -based active materials. However, in the present invention, it is of course possible to use other types of positive electrode active materials in addition to the positive electrode active material.

The negative electrode active material 221 includes a negative electrode active material capable of intercalating and deintercalating lithium ions, and the negative electrode active material may be a carbon-based negative electrode active material of crystalline or amorphous carbon, carbon fiber, or carbon composite, tin Oxides, lithiated ones thereof, lithium, lithium alloys and mixtures thereof. However, the present invention is not limited to the type of the negative electrode active material.

Here, the carbon may be at least one selected from the group consisting of carbon nanotubes, carbon nanowires, carbon nanofibers, graphite, activated carbon, graphene, and graphite.

In the present invention, the positive electrode active material 211 and the negative electrode active material 221 may contain a PTFE (Polytetrafluoroethylene) component to prevent peeling from the current collector, and to prevent cracking of the positive electrode active material 211 and the negative electrode active material 221. . The PTFE component may contain 0.5 to 20 wt% in the total weight of each of the positive electrode active material 211 and the negative electrode active material 221, and preferably at most 5 wt% or less.

The positive electrode current collector 210 and the negative electrode current collector 220 are preferably formed to a thickness of 0.5 to 2 μm.

In addition, in the present invention, the separator 250 may apply a composite porous separator capable of optimizing the impregnation of the gel polymer electrolyte.

In other words, the composite porous membrane is used as a support (matrix), a porous non-woven fabric having micropores and a thin film laminated on one side of the porous non-woven fabric, formed of a radiation polymer material is provided with a porous nanofiber web impregnated with an electrolyte solution have.

In addition, the composite porous separator is used as a support (matrix) and has a porous non-woven fabric having a micro-pore, and a porous nanofiber web is laminated on both sides of the porous non-woven fabric in a thin film, formed of a radiation polymer material impregnated with an electrolyte solution can do.

The porous nonwoven fabric that can be used as the base material is a PP nonwoven fabric, a PE nonwoven fabric, and a core composed of a three-layer structure of a nonwoven fabric made of a double structure PP / PE fiber coated with PE on the outer circumference of the PP fiber and a PP / PE / PP. Either a nonwoven fabric having a low melting point with a shutdown function, a PET nonwoven fabric made of polyethyleneterephthalate (PET) fibers, or a nonwoven fabric made of cellulose fibers may be used.

The PE nonwoven fabric has a melting point of 110 ° C, a PP nonwoven fabric having a melting point of 130 to 150 ° C, and a PET nonwoven fabric having a melting point of 230 to 250 ° C.

The porous nonwoven fabric has a thickness in the range of 10 to 40㎛, porosity 5 to 55%, Gurley value (Gurley value) is preferably set to 1 to 1000 sec / 100cc.

The porous nanofiber web may use a swellable polymer alone or a mixed polymer mixed with a heat resistant polymer capable of enhancing heat resistance in the swellable polymer, each of which is swelled in an electrolyte solution.

The porous nanofiber web may be any polymer as long as it is dissolved in a solvent to form a spinning solution and then spun by an electrospinning method to form nanofibers. In this case, a single polymer or a mixed polymer can be used. The polymer may be a swellable polymer, a non-swellable polymer, a heat resistant polymer, a mixed polymer in which a swellable polymer and a non-swellable polymer are mixed, or a mixed polymer in which a swellable polymer and a heat resistant polymer are mixed.

In the porous nanofiber web, a single or mixed polymer is dissolved in a solvent to form a spinning solution. When the spinning solution is spun using an electrospinning device, the spun nanofibers accumulate in the collector and have a three-dimensional pore structure. Form a fibrous web.

In addition, when using a mixed polymer of a swellable polymer and a non-swellable polymer (or heat resistant polymer), the swellable polymer and the non-swellable polymer have a weight ratio in the range of 9: 1 to 1: 9, preferably in the range of 8: 2 to 5: 5. It can be mixed by the weight of.

Non-swellable polymers are generally heat-resistant polymers, and their melting points are relatively high because of their high molecular weight as compared to swellable polymers. In this case, the non-swellable polymer is preferably a heat resistant polymer having a melting point of 180 ° C. or higher, and the swellable polymer is preferably a resin having a melting point of 150 ° C. or less, preferably within a range of 100 to 150 ° C.

The swellable polymers usable in the present invention are resins in which swelling occurs in the electrolyte, and can be formed into ultrafine nanofibers by electrospinning. For example, polyvinylidene fluoride (PVDF), poly (vinylidene fluoride-co-hexa) Fluoropropylene), perfuluropolymer, polyvinylchloride or polyvinylidene chloride and copolymers thereof and polyethylene glycol derivatives including polyethylene glycol dialkyl ether and polyethylene glycol dialkyl ester, poly (oxymethylene-oligo- Oxyethylene), polyoxides including polyethylene oxide and polypropylene oxide, polyvinylacetate, poly (vinylpyrrolidone-vinylacetate), polystyrene and polystyrene acrylonitrile copolymers, polyacrylonitrile methyl methacrylate copolymers Polyacrylonitrile containing Trill copolymers, polymethylmethacrylates, polymethylmethacrylate copolymers, and mixtures thereof.

In addition, the heat-resistant or non-swellable polymer that can be used in the present invention can be dissolved in an organic solvent for electrospinning, and swelling is slower or swelling than the swelling polymer by an organic solvent included in the organic electrolyte, and the melting point is 180 ° C. As the above resin, for example, polyacrylonitrile (PAN), polyamide, polyimide, polyamideimide, poly (meth-phenylene isophthalamide), polysulfone, polyetherketone, polyethylene terephthalate, poly Aromatic polyesters such as trimethylene telephthalate, polyethylene naphthalate and the like, polyphosphazenes such as polytetrafluoroethylene, polydiphenoxyphosphazene, poly {bis [2- (2-methoxyethoxy) phosphazene]} Copolymers, cellulose acetates, cellulose acetates, including polyurethanes and polyetherurethanes Sites butyrate, and the like can be used cellulose acetate propionate.

Meanwhile, in the present invention, the first exterior member 101 and the second exterior member 102 are formed to form grooves, and then, the positive and negative electrode current collectors 210 and 220 are deposited in the grooves, and the positive and negative electrode active materials are formed. The flexible battery may be implemented by coating the 211 and 221.

That is, the housing of the pouch is formed with a receiving groove for accommodating the electrode assembly. An electrode assembly separated from the exterior member can be inserted into the receiving groove.

Referring to FIG. 4, a method of manufacturing a flexible battery according to a first embodiment of the present invention may include first and second exterior materials in which a reinforcing film member, a moisture penetration prevention film, an electrolyte leakage prevention film, and a thin film for bonding are sequentially stacked. Prepare (S100).

Thereafter, the thin film for bonding the first and second exterior materials is surface treated (S110). The bonding thin film may be applied as a CPP layer as described above, and the metal of copper or aluminum deposited in the process described below by performing one of a plasma treatment process, a primer treatment process, and an ion beam treatment process on the CPP layer surface. The surface of the CPP layer is modified to improve adhesion with the CPP layer.

Subsequently, an electrode current collector is deposited on the thin film for bonding the first and second exterior materials having the surface treatment (S120). In this process, a metal such as copper or aluminum is deposited on the bonding thin film to form a current collector, but the deposition thickness of the metal is preferably 0.5 to 1 μm. Here, copper is deposited on the thin film for bonding of the first outer material to form the positive electrode current collector, and aluminum is deposited on the thin film for bonding of the second outer material to form the negative electrode current collector.

Next, the positive electrode active material is coated on the electrode of the first outer material, and the negative electrode active material is coated on the electrode of the second outer material (S130).

Subsequently, a separator having a plurality of pores is stacked on the cathode active material of the first exterior material, and the second exterior material is laminated on the separator so that the anode active material contacts the separator (S140).

Subsequently, a first seal is formed to be bonded except for one region of edges of the first and second exterior materials to form a pouch (S150).

Subsequently, the electrolyte is injected through the one region, the electrolyte is immersed in the pores of the separator (S160), and the second seal is bonded to the edges of the first and second exterior materials corresponding to the unbonded region (S170).

Finally, the pouch is heat treated to gel the electrolyte (S180). In this gelation step, the electrolyte solution becomes a gel electrolyte.

5 is a view for explaining a method of manufacturing a flexible battery according to a first embodiment of the present invention.

In the present invention, the first and second exterior materials 150 are rectangular base portion 150a; And an extension part 150b extending from one side of the base part 150a.

The surface of the bonding thin film of the first and second exterior materials 150 is treated (step S110 of FIG. 4) ('151' in FIG. 5 is the surface-treated first and second exterior materials).

Subsequently, copper (Cu) is deposited on the thin film for bonding the surface-treated first exterior material and aluminum (Al) is deposited on the thin film for bonding the second exterior material ('150a in FIG. 5 is a first copper-deposited layer). Exterior material, and '150b' is a second exterior material in which aluminum is deposited. Here, the edges 151 of the surface-treated first and second exterior materials 150 are masked with a mask (not shown) to deposit copper or aluminum to fabricate a current collector made of a copper layer 152a1 or an aluminum layer 152b1. To form. The current collector is formed in the base portion 150a and the extension portion 150b of the first and second exterior materials 150.

Subsequently, the cathode active material 153a is coated on the copper layer 152a1 of the first exterior material, and the anode active material 153b is coated on the aluminum layer 152b1 of the second exterior material. The positive and negative electrode active materials 153a and 153b are coated only on the rectangular base portion 150a described above.

Here, the cathode active material 153a and the anode active material 153b are coated, and then a mask is removed.

Subsequently, the separator 154 is laminated on the positive electrode active material 153a of the first envelope, and the second envelope is laminated on the separator 154 so that the negative electrode active material 153b contacts the separator 154. '155' is a structure in which the first exterior member, the separator 154, and the second exterior member are stacked.

In this case, the separator 154 has a quadrangular shape, and the size of the separator 154 is smaller than that of the first and second exterior members 150, and is disposed to face the positive electrode active material 153a and the negative electrode active material 153b.

Subsequently, three surface edges of the first and second exterior materials 150 are sealed to implement a pouch form. One surface of the unsealed first and second exterior materials 150 is an open area to the outside, and the extension portion 150b of the first and second exterior materials 150 protrudes without overlapping on one surface thereof. have. That is, the current collectors of the extension portions 150b of the first and second exterior materials 150 are disposed and exposed to the front and rear surfaces of the pouch, respectively.

Subsequently, the electrolyte is inserted into one surface of the unsealed first and second exterior materials 150, the electrolyte is moistened into the pores of the separation membrane, the surface is sealed, and then the pouch is heat treated to gel the electrolyte.

After the gelation process is completed, the current collector is formed by depositing metal on the extension portions 150b of the first and second exterior materials 150 protruding to the first surface. The further process of connecting the electrode terminals to the whole is carried out.

Referring to FIG. 6, in the method of manufacturing the flexible battery according to the second embodiment of the present invention, a reinforcing film member, a moisture penetration preventing film, an electrolyte leakage preventing film, and a thin film for bonding are sequentially prepared with first and second exterior materials. (S200), the thin film for bonding of the first and second exterior materials is surface treated (S210).

Next, the pouch is formed by sealing the first one of the edges of the first and second exterior members except for one region (S220).

Subsequently, the electrode assembly and the electrolyte are inserted through one region to hydrate the electrolyte in the pores of the separator (S230). Here, the electrode assembly includes a positive electrode, a negative electrode, and a separator which separates the positive electrode and the negative electrode and has a plurality of pores. The positive electrode active material layer is formed on the positive electrode, and the negative electrode active material layer is formed on the negative electrode. One area is an unbonded area.

Subsequently, a second sealing for joining edges of the first and second exterior materials corresponding to one region is performed (S240).

Finally, the pouch is heat treated to gel the electrolyte (S250).

Therefore, the flexible battery according to the second embodiment of the present invention manufactured by performing the above process includes an electrode assembly including a positive electrode, a negative electrode, and a separator separating the positive electrode and the negative electrode; Electrolyte; And edges of the first and second exterior materials in which the reinforcing film member, the moisture penetration preventing film, the electrolyte leakage preventing film, and the thin film for bonding are sequentially laminated are joined to form a space between the first and second exterior materials. It comprises a; a pouch containing the electrode assembly and the electrolyte.

Here, the separator is provided with a plurality of pores in which the electrolyte is moistened, and the electrolyte is preferably a gel polymer electrolyte. In addition, the second embodiment only has a structural difference from the first embodiment, and the components of the battery may be equally applied.

FIG. 7 is a schematic cross-sectional view for describing a sealing process of preventing cracks in an exterior material of a flexible battery according to a first embodiment of the present invention.

In the present invention, in order to form a pouch of the flexible battery, a process of joining and sealing the edges of the first and second exterior materials should be performed.

In this case, a stacked structure of the positive electrode current collector 210, the positive electrode active material 211, the separator 250, the negative electrode current collector 220, and the negative electrode active material 221 is positioned between the first and second exterior materials.

The laminated structure exists in the form of a substantially rectangular plate, and when the side surface of the laminated structure is sealed and cracked, cracks are generated in the first and second exterior material regions corresponding to the edge regions of the laminated structure, thereby providing reliability of the flexible battery. Lowers.

Therefore, in the present invention, when sealing the first and the second outer material, as shown in Figure 7 without bending the first and second outer material at right angles from the edge of the laminated structure to the side as shown in FIG. The area is kept round (ie curved) and the first and second envelopes are sealed.

As a result, the present invention can eliminate a factor in which the first and second exterior materials are bent and cracks in the process of covering the edge regions of the laminated structure during the sealing process.

Here, as shown in FIG. 7, the flexible battery of the present invention, in which the sealing process is completed, has a round shape from the edge of the laminated structure to the sealing points of the first and second exterior materials, and the first and second exterior materials in terms of the laminated structure. It has a structural feature that a space is formed up to a sealing point of.

That is, the pouch is provided with an accommodating portion accommodating the electrode assembly and an edge sealing portion, and the boundary portion of the accommodating portion and the sealing portion is bent in a round shape.

On the other hand, the flexible battery of the present invention, as shown in Figure 8, the first housing 101, the positive electrode current collector 210 and the positive electrode active material 211 is formed; And a second exterior member 102 having the negative electrode current collector 220 and the negative electrode active material 221 formed thereon. The separator 250 may be interposed therebetween so that the cathode active material 211 may be implemented in a full cell structure facing the anode active material 221.

In addition, the flexible battery of the present invention may be implemented in a by-cell structure, and for this purpose, one exterior member 102a having a current collector 220a for the negative electrode and a negative electrode active material 221a; And another exterior material 102b in which the negative electrode current collector 220b and the negative electrode active material 221b are formed. Positive electrodes 105 having positive electrode current collectors 210a and 210b and positive electrode active materials 211a and 211b formed on both sides thereof; And a pair of separators 251 and 252.

Here, the negative electrode current collectors 220a and 220b and the negative electrode active materials 221a and 221b are formed by depositing and coating on one surface of the exterior materials 102a and 102b, and the positive electrode current collectors 210a and 210b on both sides of the positive electrode 105. And positive electrode active materials 211a and 211b.

Therefore, as shown in FIG. 9, a bi-cell structure is implemented between the two exterior materials 102a and 102b by interposing a structure in which the separator 251, the anode 105, and the separator 252 are sequentially stacked.

At this time, one separator 251 is interposed between the negative electrode active material 221a of one exterior material 102a and the positive electrode active material 211a of the positive electrode 105 to implement a first cell structure, and the other exterior material 102b. Another separator 252 is interposed between the negative electrode active material 221b and the positive electrode active material 211b of the positive electrode 105 to implement a second cell structure to become a bicell.

10 is a cross-sectional view of a packaging material of the flexible battery pouch according to a second embodiment of the present invention, and FIG. 11 is a cross-sectional view of a modification of the packaging material of the flexible battery pouch according to a second embodiment of the present invention.

Referring to FIG. 10, the exterior material of the flexible battery according to the second exemplary embodiment of the present invention includes a reinforcing film member 1110, a moisture penetration prevention film 1120, an electrolyte leakage prevention film 1130, and a thin film 1140 for bonding. Configure.

In the flexible battery packaging material according to the second exemplary embodiment, a laminated structure of the moisture penetration preventing film 1120 and the electrolyte leakage preventing film 1130 is interposed between the reinforcing film member 1110 and the bonding thin film 1140.

The moisture permeation prevention film 1120 is a thin film that prevents moisture from penetrating into the pouch from the outside of the pouch, and may be used as one of a SiN ₄ film, an Al ₂ O ₃ film, and a laminated thin film thereof. When the reinforcement film member 1110 described above is used as a COP film, aluminum may be deposited on the COP film to be used as the moisture penetration preventing film 1120.

In addition, the electrolyte leakage preventing film 1130 is a thin film that prevents the electrolyte solution located inside the pouch from leaking to the outside of the pouch, and may include a metal layer or a ceramic layer, but is not limited thereto. An empty flexible thin film or film can be used.

In addition, a modification of the exterior of the flexible battery according to the second embodiment of the present invention is shown in Figure 11, the reinforcing film member 1310 is a COP (Cyclo olefin polymer) film, moisture barrier film 1320 is The aluminum film deposited on the COP film may be applied and deformed. Here, '1330' is an electrolyte leakage preventing film, and '1340' is a thin film for bonding.

Therefore, in the second embodiment of the present invention, since the exterior material of the flexible battery includes the reinforcing film member 1110, the moisture penetration preventing film 1120, the electrolyte leakage preventing film 1130, and the bonding thin film 1140, the flexible film is flexible. The occurrence of scratches on the surface of the battery can be suppressed to improve the appearance aesthetics and improve the moisture permeation prevention efficiency. In addition, it is possible to prevent the presence of wrinkles and cracks on the surface of the pouch even when bending more than 2000 times based on a radius angle of about R30 ~ 50.

12 is a cross-sectional view of an exterior member of the flexible battery pouch according to the third embodiment of the present invention.

Referring to FIG. 12, the exterior material of the pouch of the flexible battery according to the third exemplary embodiment of the present invention includes a reinforcing film member 2100a1, an elastic metal film 2100b1, and a bonding thin film 2100c1.

The elastic metal film 2100b1 may impart elasticity to the pouch to improve flexibility of the pouch. The elastic metal film 2100b1 may be made of phosphor bronze or beryllium copper.

Here, phosphor bronze is an alloy containing phosphorus in bronze, and beryllium copper is a copper alloy containing beryllium in the range of 0.2 to 2.5%, which is the highest strength among copper alloys, and has excellent corrosion resistance, abrasion resistance, fatigue limit, spring characteristics, and electrical conductivity. .

In addition, the elastic metal film 2100b1 has a dense density and prevents moisture and electrolyte from passing therethrough, thereby preventing moisture from penetrating into the pouch from the outside of the pouch, and leaking of the electrolyte located inside the pouch to the outside of the pouch. It can also perform a function to block it.

Here, since the exterior material of the pouch of the flexible battery according to the third embodiment of the present invention has a structure laminated in the same state as a flexible copper clad laminate (FCCL) in which copper foil is bonded on a thin plastic or polymer film. , The adhesion between the reinforcing film member 2100a1 and the elastic metal film 2100b1 is excellent.

That is, the elastic metal film 2100b1 may be formed of an elastic metal film laminated by being bonded to the reinforcing film member 2100a1 with an adhesive, thereby manufacturing a pouch exterior material having excellent adhesion.

Therefore, in the third embodiment of the present invention, since the outer packaging material of the pouch is composed of the reinforcing film member 2100a1, the elastic metal film 2100b1 and the bonding thin film 2100c1, an ultra-thin pouch and a flexible battery can be implemented. The moisture permeation prevention efficiency can be improved and flexibility can be improved.

In addition, in the third embodiment of the present invention, the reinforcing film member 2100a1 and the elastic metal film 2100b1 have excellent adhesive strength, and thus, wrinkles and cracks may be prevented from occurring in the pouch during bending.

13 is a cross-sectional view of an exterior member of the flexible battery pouch according to a fourth embodiment of the present invention, and FIG. 14 is a cross-sectional view of an exterior member of the flexible battery pouch according to a fifth embodiment of the present invention.

The flexible battery pouch according to the fourth and fifth embodiments of the present invention forms a barrier layer for preventing moisture permeation on a polymer substrate to implement a two-layer structure or a three-layer structure. The present invention aims to realize an excellent thin film flexible battery.

In particular, the barrier layer serves to block moisture from permeating from the outside, thereby reducing the moisture permeability of the flexible battery pouch.

That is, referring to FIG. 13, the flexible battery pouch 3050 according to the fourth exemplary embodiment has a two-layered structure in which a single barrier layer 3020 is stacked on the polymer substrate 3010.

Here, the single barrier layer 3020 of one layer may use a metal layer or a ceramic layer, the metal layer is preferably implemented by Al, Cu, Cr, and the like, and other metals, alloys and combinations thereof, and a lamination structure thereof. It is possible. In this case, when the single barrier layer 3020 is a metal layer, the bending property of the flexible battery pouch 3050 may be improved.

The ceramic layer may be sputtered, chemical vapor deposition, spin coating, spray coating, baking, spin coating and baking, pulsed laser deposition, cathodic arc deposition, plasma enhanced chemical vapor deposition (plasma). It may be formed by a process selected from the group consisting of enhanced chemical deposition, molecular beam epitaxy, sol-gel process, liquid phase epitaxy, and combinations thereof.

For example, the ceramic layer may be formed by mixing a ceramic raw powder, an organic binder, and a solvent to form a slurry, coating the ceramic slurry on a polymer substrate, debinding the coated ceramic slurry, removing the organic component, and then firing.

And, the polymer substrate 3020 is PTFE (Polytetrafluoroethylene), nylon (Nylon), PP, PET, PEN, PVDC (Polyvinylidene Chloride), PE, PVC, EVOH (Ethylene Vinyl Alcohol), CPP (Casting Polypropylene), LLDPE (Linear) Low Density Polyethylene (LDPE), Low Density Polyethylene (LDPE), High Density Polyethylene (HDPE), polyethylene, polyethylene terephthalate, polypropylene, ethylene vinyl acetate (EVA) may be made of a single layer structure or a stacked structure thereof.

Referring to FIG. 14, in the flexible battery pouch 3060 according to the fifth embodiment of the present invention, a double barrier layer 3030 is stacked on the polymer substrate 3010 to have a three-layer structure.

The double barrier layer 3030 may be composed of a first barrier layer 3031 made of a metal layer or a ceramic layer, and a second barrier layer 3032 stacked on the first barrier layer 3031 and made of a metal layer or a ceramic layer. .

Here, the second barrier layer 3032 is to further reinforce the function of the first barrier layer 3031 to further impart a moisture blocking function or a bending function.

When the double barrier layer 3030 is implemented in a structure in which a metal layer is stacked on the polymer substrate 3010 and a ceramic layer is stacked on the metal layer, the ceramic layer is coated with a high strength silicon containing an inorganic filler on the metal layer. By forming it, it is possible to increase the water repellency and lower the water vapor transmission rate.

At this time, the specific type that can be used as the inorganic filler (filler) is not particularly limited, but SiO ₂ , MgO, Y ₂ O ₃ , BaTiO ₃ , ZrSiO ₂ , Al ₂ O ₃ , SiON, Si ₃ N ₄ , ZrO ₂ , HfO ₂ , Ta ₂ O ₅ , TiO ₂ It is preferable to consist of one. In addition, the inorganic filler may be spherical, elongated, rod-shaped, elliptical, or the like.

In addition, by coating nano silica on the upper surface of the metal layer to form a silicon coating layer (silicone coating layer) can implement a ceramic layer.

As described above, the ceramic layer stacked on the metal layer functions as a protective film to improve physical and chemical durability, and also serves to reinforce the strength of the flexible battery pouch.

In addition, the inorganic filler may maximize the blocking property against moisture and moisture by lengthening a movement path of moisture or moisture that penetrates into the flexible battery pouch and inhibits its penetration.

Referring to FIG. 15, in the present invention, the polymer substrate 3010 may be implemented in a structure in which the first substrate 3011 and the second substrate 3012 are heat-sealed.

In this case, the heat sealing of the first substrate 3011 and the second substrate 3012 may be a high-sealing polymer resin, in particular, CPP (Casting Polypropylene), LLDPE (Linear Low Density Polyethylene), LDPE (Low Density) Polyethylene), HDPE (High Density Polyethylene), polyethylene, polyethylene terephthalate, polypropylene, ethylene vinyl acetate (EVA), it can be used as a single layer structure or a laminated structure of one of the epoxy resin and phenol resin.

The water vapor transmission rate (WVTR) of the flexible battery pouches according to the fourth and fifth embodiments of the present invention is preferably 0.005 g / m 2 · day or less, more preferably 0.003 g / m 2 · day or less to be.

And, the thickness of the polymer substrate applied to the exterior material of the flexible battery pouch according to the fourth and fifth embodiments of the present invention is 5 ~ 500㎛, the thickness of the metal layer is 0.01 ~ 10㎛, the thickness of the ceramic layer is 0.001 ~ 100㎛ This is preferred.

16 is a plan view illustrating a pouch applied to a flexible battery according to the fourth and fifth embodiments of the present invention.

The pouches according to the fourth and fifth embodiments of the present invention are excellent in flexibility and implement a thin film type flexible battery, and a flexible electrode assembly and an electrolyte (or electrolyte) are formed between the first and second packaging materials. Interposed, the first and second envelopes are sealed to protect the flexible electrode assembly and electrolyte from the outside and to prevent moisture ingress. Here, the electrolyte accommodated in the pouches of the first to seventh embodiments of the present invention can be used as the electrolyte solution.

Referring to FIG. 16, the pouches 3100 according to the fourth and fifth exemplary embodiments of the present invention have one side surface in which three edges of four sides of the first exterior material and the second exterior material are thermally fused and not thermally fused. 3101) is an open bag.

Since the edges of the three surfaces of the first and second exterior materials are thermally fused to each other, a space 3110 is provided inside the first and second exterior materials, whereby the flexible electrode assembly and the electrolyte are inserted into the space 3110.

Here, the first exterior material and the second exterior material are used as the exterior material of the flexible battery pouch of the present invention.

The first and second exterior members of the first side and the second exterior member 3101, which are not heat-sealed, are provided with receiving grooves 3102 and 3103, some of which are removed to expose the positive and negative terminals of the flexible electrode assembly. The accommodating grooves 3102 and 3103 are not opposed to each other, so that the positive electrode terminal and the negative electrode terminal are disposed and exposed to the front and rear surfaces of the pouch 3100, respectively.

The above-described flexible electrode assembly includes a positive electrode, a negative electrode, and a separator separating the positive electrode and the negative electrode, a positive electrode active material layer is formed on the positive electrode, and a negative electrode active material layer is formed on the negative electrode.

17 is a view for explaining a method of assembling a flexible battery using a flexible battery pouch according to the fourth and fifth embodiments of the present invention.

Referring to FIG. 17, the flexible battery includes a pouch 3100; It is composed of a flexible electrode assembly 3300 and an electrolyte (not shown) inserted into the interior space of the pouch 3100.

When the flexible electrode assembly 3300 and the electrolyte are inserted into and sealed in the internal space 3110 of the pouch 3100, the flexible battery is manufactured.

In the flexible electrode assembly 3300, a separator (not shown) is interposed between the negative electrode 3310 and the positive electrode 3320. Each of the negative electrode 3310 and the positive electrode 3320 corresponds to a negative electrode terminal 3311 and a positive electrode terminal 3331, and the negative electrode terminal 3311 and the positive electrode terminal 3331 are formed of the first exterior member and the second of the pouch 3100. Positioned corresponding to the receiving grooves 3102 and 3103 formed in the exterior material, and exposed to the front and rear of the pouch 3100, respectively.

In this case, an electrolyte is also included in the internal space 3110 of the pouch 3100 together with the flexible electrode assembly 3300. When the electrolyte is a liquid electrolyte, the flexible electrode assembly 3300 is inserted into the internal space 3110 of the pouch 3100, the liquid electrolyte is introduced into the internal space, and then sealed. In the case where the electrolyte is a gel electrolyte, the flexible electrode assembly in which the gel electrolyte is positioned between each of the cathode 3310, the anode 3320, and the separator may be inserted into the interior space 3110 of the pouch 3100 and then sealed.

18 is a conceptual perspective view of a watch phone with a flexible battery according to the fourth and fifth embodiments of the present invention.

The above-described flexible battery of the present invention can be applied to applications such as watch phones, E-paper, E-Mobile, medical devices such as wrist blood testers, and portable munitions such as wearable radios.

Referring to FIG. 18, the watch phone including the flexible battery according to the fourth and fifth embodiments of the present invention may include a watch phone body 3000; And a flexible battery for supplying power to the watch phone body 3000 and includes a watch band 3200 worn on a user wrist.

The watch phone main body 3000 may have various functions other than a watch function such as a camera function, a voice command and a memo function, and a music listening function. In addition, a function of a smartphone including a text and a phone call and a function of interworking with the smartphone It is defined as a main body that can have, the watch phone main body 3000, the external case, the display unit exposed to the external case; And parts including a display unit and a driving unit for driving the watch phone.

The watch band 3200 has a structure in which a flexible battery is built in an exterior material having an aesthetic appearance. The flexible battery embedded in the watch band 3200 supplies power to components that require power among components embedded in the watch phone body 3000. Herein, the flexible battery is manufactured from the pouches of the first to seventh embodiments of the present invention.

Here, the watch phone main body 3000 may be equipped with a main battery (main battery) for applying power to the components, in this case, the flexible battery may be a secondary battery, the main battery and the flexible battery is connected in series or Can be connected in parallel. In this case, when one flexible battery is built in the watch band 3200, the main battery and one flexible battery may be connected in series, and when the plurality of flexible batteries are built in the watch band 3200, the main battery and the plurality of flexible batteries may be installed. The flexible battery can be configured to be connected in series or parallel to increase the usage time of the watch phone.

In the present invention, by embedding a flexible battery having excellent flexibility in the watch band 3200 of the watch phone body 3000, the user can improve the fit with excellent flexibility when wearing the watch band 3200 on the wrist have.

Referring to FIG. 19, the above-described flexible battery is built in the watch band 3200. In this case, the positive electrode terminal 3210 and the negative electrode terminal 3220 of the flexible battery may protrude to the end of the watch band 3200, and the positive electrode terminal 3210 and the negative electrode terminal protruding to the end of the watch band 3200. 3220 may serve as a means, and a female terminal capable of being combined with the positive electrode terminal 3210 and the negative electrode terminal 3220 may be formed in the watch phone body 3000. That is, the watch phone main body 3000 has a female terminal into which the positive electrode terminal 3210 and the negative electrode terminal 3220 protruding toward the end of the watch band 3200 are formed, and the two are connected to each other to make an electrical connection. Can be.

Referring to FIG. 20, the connector 3230 connected to the positive terminal and the negative terminal of the flexible battery protrudes toward the end of the watch band 3200, and the connector 3230 is inserted into the watch phone body 3000. It can be configured to be provided with a socket 3001 that can be electrically connected. In this case, the connector 3230 is inserted into the socket 3001 of the watch phone main body 3000, so that the power of the flexible battery is applied through the connector 3230 and the socket 3001, and the parts of the watch phone main body 3000 are provided. Electrical circuit wiring (eg, FPCB) that may be applied to the watch may be further disposed inside the watch phone body 3000.

In the present invention, the connector 3230 may be configured to be used as a charging terminal for charging the flexible battery.

In the present invention, as shown in Figure 21, the watch band coupled to the watch phone body 3000 one end of the first watch band (3201); And a second watch band 3202 coupled to the other end of the watch phone body 3000. A first flexible battery may be built in the first watch band 3201, and a second flexible battery may be built in the second watch band 3320.

In addition, a watch band (not shown) may be integrally formed with the watch phone body 3000, and in this case, one flexible battery may be built in the watch band.

Referring to FIG. 22, in the present invention, a detachable watch band 3203 that is separated from the watch phone body 3000 may be applied.

Here, one end of the watch band 3203 is fixed to one end of the watch phone body 3000 and the electrode of the flexible battery is electrically connected to the components of the watch phone body 3000, and the other end of the watch band 3203 is A structure that is inserted into and coupled to the insertion groove of the watch phone body 3000 may be implemented.

On the contrary, one end of the watch phone body 3000 is fixed only to one end of the watch band 3203, and the connector 3001 connected to the electrodes of the flexible battery built in the watch band 3203 is connected to the watch phone body 3000. It can be configured to be inserted into the socket (3001).

The coupling relationship between the watch band and the watch phone main body 3000 is variously modified, and is not limited to the coupling structure shown in the present invention. In the present invention, the flexible battery may be configured to enable wireless charging.

FIG. 23 is a cross-sectional view of the exterior material of the flexible battery pouch according to the sixth embodiment of the present invention, and FIG. 24 is a cross-sectional view of the exterior material of the flexible battery pouch according to the seventh embodiment of the present invention.

Referring to FIG. 23, the exterior material of the flexible battery pouch according to the sixth embodiment of the present invention includes a PTFE (Polytetrafluoroethylene) layer 4200 and a bonding thin film 4210.

PTFE layer 4200 is excellent in chemical resistance, wear resistance, heat resistance and flexibility. Therefore, the exterior material of the flexible battery pouch according to the first embodiment of the present invention can prevent the penetration of moisture from the outside, and can withstand the heat generated by the operation of the secondary battery. In addition, the pouch may not be deformed due to warpage, thereby improving flexible characteristics of the rechargeable battery.

The thickness t11 of the PTFE layer 4200 is preferably 1 μm to 500 μm, and when the thickness t11 of the PTFE layer 4200 is 1 μm or less, the amount of moisture penetrated from the outside of the pouch may increase the characteristics of the secondary battery. When it is hard to hold | maintain and thickness t11 is 500 micrometers or more, the thickness of the exterior material of a pouch will be thick and a curvature characteristic will fall.

In the present invention, the first exterior member and the second exterior member are heat-sealed at the edges of the side bars. The thin film 4210 for bonding the exterior member thermally fuses the first exterior member and the second exterior member. The bonding thin film 4210 is laminated on the PTFE layer 200 to be fused by a heat fusion process to seal the first and second exterior materials.

The bonding thin film 4210 may use a high sealing polymer resin, and in particular, CPP (Casting Polypropylene), LLDPE (Linear Low Density Polyethylene), LDPE (Low Density Polyethylene), HDPE (High Density Polyethylene), polyethylene, It can be used as a single layer structure or a laminated structure of one of polyethylene terephthalate, polypropylene, ethylene vinyl acetate (EVA), epoxy resin and phenol resin.

Referring to FIG. 24, the exterior material of the flexible battery pouch according to the seventh embodiment of the present invention includes a PTFE (Polytetrafluoroethylene) layer 4200, a bonding thin film 4210, an adhesive layer 4220, and a strength reinforcing layer 4230. do.

The packaging material of the pouch of the seventh embodiment is a structure in which the strength reinforcing layer 4230 is bonded to the PTFE layer 200 of the packaging material of the pouch of the sixth embodiment via the adhesive layer 4220. That is, the pouch exterior material of the first embodiment includes the PTFE layer 4200, which is excellent in flexibility, but may have low strength, so that fine wrinkles may be generated on the pouch-sealed surface. In the seventh embodiment, the strength reinforcing layer 4230 is provided. It will contain more. Herein, the strength reinforcing layer 4230 is preferably PET.

It is preferable that the thickness t12 of the strength reinforcement layer 4230 is 1 micrometer-500 micrometers. Here, when the thickness t12 of the strength reinforcement layer 4230 is 1 µm or less, the thickness is thin and the strength reinforcement is not performed. When the thickness t12 of the strength reinforcement layer 4230 is 500 µm or more, the thickness is thick and the bending property is low. .

Therefore, the pouch for the flexible battery according to the sixth and seventh embodiments of the present invention has an advantage of preventing appearance of wrinkles caused by bending, thereby improving the appearance aesthetics.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

The present invention provides a flexible battery pouch and a flexible battery using the same by realizing a pouch having a laminated structure having excellent interlayer adhesion, thereby preventing wrinkles and cracks in the pouch during bending.

Claims (20)

A pouch for a flexible battery comprising an electrode assembly, a separator, and an exterior material for sealing an electrolyte solution, The exterior material is a flexible battery pouch comprising a structure in which a reinforcing film member, a moisture penetration and electrolyte leakage preventing film, and a bonding thin film are stacked. The method of claim 1, The moisture penetration and electrolyte leakage preventing film is a flexible battery pouch made of one of Cu, Al, phosphor bronze or beryllium copper. The method of claim 1, The reinforcing film member is a flexible battery pouch which is one of a polyethylene terephthalate (PET) film, a cyclo olefin polymer (COP) film, and a PI film. The method of claim 1, The moisture penetration and electrolyte leakage preventing film is one of a metal film laminated by being bonded with an adhesive to the reinforcing film member, a metal coating film coated on the reinforcing film member, and a metal plating film electrolytic plated on the reinforcing film member. . The method of claim 1, The bonding thin film is a flexible battery pouch CPP (casting polypropylene) film. A pouch for a flexible battery comprising an electrode assembly, a separator, and an exterior material for sealing an electrolyte solution, The exterior material, PTFE (Polytetrafluoroethylene) layer; And a bonding thin film laminated on the PTFE layer. The method of claim 6, wherein the bonding thin film, Among CPP (Casting Polypropylene), LLDPE (Linear Low Density Polyethylene), LDPE (Low Density Polyethylene), HDPE (High Density Polyethylene), Polyethylene, Polyethylene Terephthalate, Polypropylene, Ethylene Vinyl Acetate (EVA), Epoxy Resin and Phenolic Resin A pouch for a flexible battery that is one single layer structure or a stacked structure thereof. An anode assembly and a cathode assembly disposed opposite each other; A separator disposed between the anode assembly and the cathode assembly; A pouch according to any one of claims 1 to 7 for housing and sealing the positive electrode assembly, the negative electrode assembly, and the separator; And A flexible battery comprising; an electrolyte injected into the pouch. The flexible battery of claim 8, wherein the electrolyte is a gel polymer electrolyte. The method of claim 8, The separator, Porous nonwoven fabric having fine pores; And And a nanofiber web stacked on one side or both sides of the porous nonwoven fabric, the nanofiber web formed of a radiation polymer material. The method of claim 8, wherein the positive electrode assembly, A positive electrode current collector; And A flexible battery comprising an electrode formed by coating a cathode active material on the cathode current collector. The method of claim 11, The positive electrode current collector includes a copper foil or a Cu deposition film deposited on the bonding thin film, The positive electrode active material is LiCoO ₂ , LiNiO ₂ , LiNiCoO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , V ₂ O ₅ , V ₆ O ₁₃ , LiNi _1-xy Co _x M _y O ₂ (0 ≦ x ≦ 1, 0 ≦ A flexible battery, wherein y ≦ 1, 0 ≦ x + y ≦ 1, M is one of a lithium-transition metal oxide such as Al, Sr, Mg, and La), and an active material of Lithium Nickel Cobalt Manganese (NCM). The method of claim 11, The positive electrode active material is a flexible battery containing PTFE (Polytetrafluoroethylene) for preventing the crack of the electrode and the separation of the electrode from the positive electrode current collector. The method of claim 13, The positive electrode current collector is formed to a thickness of 0.5 ~ 2㎛, The PTFE is a flexible battery containing 0.5 ~ 20wt%. The method of claim 8, wherein the negative electrode assembly, Negative electrode current collector; And Flexible battery comprising; an electrode formed by coating a negative electrode active material on the negative electrode current collector. The method of claim 15, The negative electrode current collector includes an Al deposition film deposited on Al foil or the thin film for bonding, The negative electrode active material is a flexible battery that is one selected from the group consisting of carbon-based negative electrode active material of crystalline or amorphous carbon, carbon fiber or carbon composite, tin oxide, lithiated thereof, lithium, lithium alloy and mixtures thereof. The method of claim 15, The negative active material includes a flexible battery including PTFE (Polytetrafluoroethylene) for preventing the crack of the electrode and the peeling of the electrode from the negative electrode current collector. The method of claim 17, The negative electrode current collector is formed to a thickness of 0.5 ~ 2㎛, The PTFE is a flexible battery containing 0.5 ~ 20wt%. The method of claim 8, The battery of the pouch has a flexible battery formed with a receiving groove for receiving the electrode assembly. The method of claim 8, The pouch has an accommodating part for accommodating an electrode assembly and a sealing part at an edge thereof, and a boundary portion between the accommodating part and the sealing part is bent in a round shape.

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