KR101864882B1 - Battery Case Comprising PTFE-Based Material - Google Patents

Abstract

The present invention relates to a battery pack comprising a battery pack, a battery pack, and a battery pack, wherein the battery pack includes a battery module, , And a second polymer resin layer are sequentially laminated on the first polymer resin layer, and the second polymer resin layer constituting the outermost layer comprises polytetrafluoroethylene (PTFE) based material Thereby providing a battery case.

Description

A battery case comprising a PTFE-based material {Battery Case Comprising PTFE-Based Material}

The present invention relates to a battery case comprising a PTFE-based material.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, as technology development and demand for mobile devices increase, the demand for batteries as energy sources is rapidly increasing. Recently, the use of secondary batteries as a power source for electric vehicles (EV) and hybrid electric vehicles (HEV) In addition, the use area has been expanded for use as a power auxiliary power source through a grid, and accordingly, a lot of researches on a battery that can meet various demands have been conducted.

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

Also, the secondary battery is classified according to the structure of the electrode assembly having the positive electrode, the negative electrode, and the separator interposed between the positive electrode and the negative electrode. Typically, the long battery- A stacked (stacked) electrode assembly in which a plurality of positive electrodes and negative electrodes cut in a predetermined size unit are sequentially stacked with a separator interposed therebetween, the jelly-roll (wound type) electrode assembly having a structure in which a separator is interposed; A stack / folding type electrode assembly having a structure in which a bi-cell or a full cell is stacked with a predetermined unit of positive and negative electrodes stacked with a separator interposed therebetween.

The secondary battery includes a cylindrical battery and a prismatic battery in which the electrode assembly is housed in a cylindrical or rectangular metal can according to the shape of the battery case, and a pouch type battery in which the electrode assembly is housed in a pouch-shaped case of an aluminum laminate sheet .

In particular, in recent years, a pouch-shaped battery having a structure in which a stacked or stacked / folded electrode assembly is embedded in a pouch-shaped battery case of an aluminum laminate sheet has attracted much attention due to low manufacturing cost, small weight, And its usage is gradually increasing.

1 is a schematic view schematically showing a cross-sectional structure of a conventional pouch-shaped battery case.

Referring to FIG. 1, the battery case 100 includes an outer coating layer 110 forming an outermost layer, a barrier layer 130 preventing penetration of a material, and an inner sealant layer 150 for sealing.

Since the outer coating layer 110 protects the battery from the outside, excellent tensile strength and weather resistance are required compared with the thickness, and ONy (stretched nylon film) is widely used. The barrier layer 130 serves to prevent air, moisture, and the like from flowing into the battery, and mainly aluminum (Al) is used. The inner sealant layer 150 serves to provide sealing property by mutually heat-sealing by heat and pressure applied while the electrode assembly is embedded, and is mainly composed of CPP (unleaded polypropylene film). The adhesive layers 120 and 140 serve to compensate for the low adhesion of the ONy outer coating layer 110 and the CPP inner sealant layer 150 to the barrier layer 130.

The battery case having such a multilayer laminate structure is deformed or damaged due to contamination of foreign matter during the process of manufacturing the battery using the battery case or during use of the battery so that the outer covering layer of the laminate sheet can not be stably protected Lt; / RTI > For example, in the process of injecting the electrolyte into the battery case during the manufacturing process of the battery, in the process of sealing the battery case in which the electrolyte is leaked from the electrolyte injection hole or the electrolyte is injected by heat fusion, The electrolyte solution in the battery case can be locally contacted with the outer covering layer of the battery case. As a result, the outer covering layer made of ONy may melt, resulting in defective appearance. Further, the barrier layer made of aluminum may be exposed to the outside , Contact with the external electrical connecting members may cause an electrical problem or the thickness of the battery case may be locally reduced due to the damaged outer covering layer so that the internal electrode assembly can not be effectively protected.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted extensive research and various experiments and have found that the polymer resin layer constituting the outermost layer of the battery case includes a polytetrafluoroethylene (PTFE) based material It is possible to prevent defective appearance of the battery case due to contact with the electrolytic solution and to prevent deformation and damage of the battery case and to more stably protect the inner electrode assembly. .

According to an aspect of the present invention, there is provided a battery case,

And a separator interposed between the positive electrode and the negative electrode, wherein the first polymeric resin layer, the metal layer, and the first polymeric resin layer are formed from the inner surface of the battery case facing the electrode assembly, 2 polymer resin layer sequentially stacked on the first polymer resin layer and the second polymer resin layer constituting the outermost layer may include a polytetrafluoroethylene (PTFE) material.

Therefore, even if the second polymer resin layer containing the PTFE-based material is in contact with the electrolyte solution, it is not deformed or damaged, thereby preventing defective appearance of the battery case and more reliably protecting the inner electrode assembly have.

In one specific example, the first polymer resin layer, the metal layer, and the second polymer resin layer may have a predetermined thickness, and more specifically, the thickness of the first polymer resin layer may be 20 탆 to 40 탆 , The thickness of the metal layer may be 25 탆 to 45 탆, the thickness of the second polymer resin layer may be 5 탆 to 25 탆, and more specifically, the thickness of the first polymer resin layer may be within 30 탆 The thickness of the metal layer may be about 35 μm, and the thickness of the second polymer resin layer may be about 15 μm.

If the thicknesses of the first polymer resin layer, the metal layer, and the second polymer resin layer are too thin beyond the above range, the bonding strength and the durability of the first polymer resin layer and the second polymer resin layer deteriorate to cause a partial desorption phenomenon during long- , The size of the battery cell including the battery case increases and the capacity of the battery cell may be reduced within the limited battery cell size. There is a problem that can be deteriorated.

In one specific example, the laminated structure of the first polymer resin layer, the metal layer and the second polymer resin layer is such that the sheet forming each layer is a non-reactive adhesive which does not affect the operation of the battery, Or by a dry lamination method, which is attached by a dry lamination method.

More specifically, the battery case according to the present invention has a laminated structure in which a first polymer resin layer, a metal layer, and a second polymer resin layer are sequentially laminated from the inner surface of the battery case facing the electrode assembly, The first polymer resin layer, the metal layer, and the second polymer resin layer can form a laminated structure by a dry lamination method in which sheets forming respective layers are mutually adhered by a predetermined adhesive.

At this time, the adhesive may be a non-reactive adhesive that does not affect the operation of the battery, and the non-reactive adhesive may be a silicone polymer adhesive or a carbon fiber optical polymer adhesive.

The adhesive may be configured to form a predetermined thickness between the first polymer resin layer, the metal layer, and the second polymer resin layer so as to exhibit a desired adhesive force without affecting the moldability of the battery case In detail, it may be 1 탆 to 5 탆, and more specifically, it may be 3 탆 or less.

In another specific example, the second polymer resin layer may be a structure in which fine particles in a state in which PTFE is dissolved in a solvent are added to the metal layer by spraying.

As described above, the laminated structure of the first polymer resin layer, the metal layer, and the second polymer resin layer constituting the battery case according to the present invention is a laminate structure in which the sheet forming each layer is a non-reactive And may be formed by a dry lamination method, which is attached by a non-reactive adhesive.

However, the laminated structure is not limited to this, and the second polymer resin layer may be a structure in which fine particles in a state in which PTFE is dissolved in a solvent are added to the metal layer by spraying.

More specifically, when the sheets forming the respective layers are adhered by an adhesive agent, partial segregation may occur depending on the use of the battery for a long period of time, Or external foreign matter penetrates into the desorbed portion, thereby damaging the first polymer resin layer and the metal layer, so that the internal electrode assembly can not be safely protected.

However, when the second polymer resin layer is formed by adding the PTFE to the metal layer in a spraying manner as a fine particle state in a state that the PTFE is dissolved in a solvent, the fine particles may be stably attached to the metal layer, Thereby effectively preventing the problem caused by the problem.

In this case, the fine particles forming the second polymer resin layer may be added by being sprayed onto the adhesive in the state that the adhesive is applied on the metal layer, but the present invention is not limited thereto, and fine particles of PTFE It is needless to say that it is also possible to form the second polymer resin layer directly by adding the PTFE in a fine particle state dissolved in the solvent without adding any adhesive on the metal layer .

The spraying method is not particularly limited as long as the fine particles can be stably added and fixed by spraying fine particles in a state in which PTFE is dissolved in a solvent on a metal layer, A spray coating method, an ink jet coating method, a slit coating method, a die coating method, a spin coating method, or an electrospray coating method, and more specifically, an electrospray coating method.

In this case, in the coating process by the spraying method, the solvent can be evaporated into the air, so that the particulate PTFE can be uniformly added to the metal layer in the form of a film.

The first polymer resin layer may be formed of a material selected from the group consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinylidene fluoride (PVdF), polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), and polyacrylonitrile And the metal layer may be an aluminum layer.

The present invention provides a secondary battery including the battery case, wherein the secondary battery has a structure in which an electrode assembly is installed in a battery case of a battery case, and an electrolyte is injected into the battery compartment and sealed. .

In other words, the secondary battery is manufactured by injecting and sealing an electrolyte into the accommodating portion in a state in which the electrode assembly is mounted on the accommodating portion of the battery case. At this time, the second battery, which is the outermost layer of the battery case, Since the polymer resin layer contains the PTFE-based material, the second polymer resin layer does not melt even when the electrolyte solution contacts the outer surface of the battery case according to leakage of the electrolyte solution during the electrolyte injection process, Defective appearance of the case can be prevented, deformation and damage of the battery case can be prevented, and the inner electrode assembly can be more stably protected.

In one specific example, the electrode assembly may have a structure in which a positive electrode sheet and a negative electrode sheet on which a separator sheet is interposed are wound.

However, the structure of the electrode assembly is not limited thereto. Specifically, the electrode assembly may have a structure in which an anode, a cathode, and a separator interposed between the anode and the cathode are sequentially stacked, or a structure in which an anode, a cathode, It is needless to say that the unit cells of the laminated structure constituted by the separator interposed between the separators may be continuously wound by the separator.

The secondary battery may be a lithium secondary battery such as a lithium ion battery or a lithium ion polymer battery having advantages such as high energy density, discharge voltage, and output stability, although the secondary battery is not particularly limited in its kind .

Generally, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing a lithium salt.

The positive electrode is prepared, for example, by coating a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector, and then drying the mixture. Optionally, a filler may be further added to the mixture.

The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ and Cu ₂ V ₂ O ₇ ; A Ni-site type lithium nickel oxide expressed by the formula LiNi _1-x M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); Formula _{LiMn 2-x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 ~ 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ , and the like. However, the present invention is not limited to these.

The conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the cathode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component which assists in bonding of the active material and the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture containing the cathode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for suppressing the expansion of the anode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery. Examples of the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The negative electrode is manufactured by applying and drying a negative electrode active material on a negative electrode collector, and if necessary, the above-described components may be selectively included.

Examples of the negative electrode active material include carbon such as non-graphitized carbon and graphite carbon; _{Li x Fe 2 O 3 (0≤x≤1} ), Li x WO 2 (0≤x≤1), Sn x Me 1-x Me 'y O z (Me: Mn, Fe, Pb, Ge; Me' : Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, Halogen, 0 < x < Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4, and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separation membrane and the separation film are interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 mu m, and the thickness is generally 5 to 130 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

Further, in one specific example, in order to improve the safety of the battery, the separation membrane and / or the separation film may be an organic / inorganic composite porous SRS (Safety-Reinforcing Separators) separation membrane.

The SRS separator is manufactured by using inorganic particles and a binder polymer on the polyolefin-based separator substrate as an active layer component. In addition to the pore structure contained in the separator substrate itself, the SRS separator is formed by interstitial volume between inorganic particles And has a uniform pore structure.

The use of such an organic / inorganic composite porous separator has the advantage of suppressing an increase in thickness of the cell due to swelling at the time of chemical conversion compared with the case of using a conventional separator, When a gelable polymer is used when liquid electrolyte is impregnated, it can also be used as an electrolyte.

In addition, the organic / inorganic composite porous separator can exhibit excellent adhesion characteristics by controlling the contents of the inorganic particles and the binder polymer in the separator, so that the cell assembly process can be easily performed.

The inorganic particles are not particularly limited as long as they are electrochemically stable. That is, the inorganic particles usable in the present invention are not particularly limited as long as the oxidation and / or reduction reaction does not occur in the operating voltage range of the applied battery (for example, 0 to 5 V based on Li / Li +). Particularly, when inorganic particles having an ion-transporting ability are used, the ion conductivity in the electrochemical device can be increased and the performance can be improved. Therefore, it is preferable that the ionic conductivity is as high as possible. In addition, when the inorganic particles have a high density, it is difficult to disperse the particles at the time of coating, and there is a problem of an increase in weight during the production of the battery. In the case of an inorganic substance having a high dielectric constant, dissociation of an electrolyte salt, for example, a lithium salt, in the liquid electrolyte also contributes to increase ionic conductivity of the electrolyte.

The nonaqueous electrolyte solution containing a lithium salt is composed of a polar organic electrolyte and a lithium salt. As the electrolytic solution, a non-aqueous liquid electrolytic solution, an organic solid electrolyte, an inorganic solid electrolyte and the like are used.

Examples of the nonaqueous liquid electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, methyl pyrophosphate, ethyl propionate and the like can be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.

Examples of the inorganic solid electrolyte include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides and sulfates of Li such as Li ₄ SiO ₄ -LiI-LiOH and Li ₃ PO ₄ -Li ₂ S-SiS ₂ can be used.

The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.

For the purpose of improving the charge-discharge characteristics and the flame retardancy, the non-aqueous liquid electrolyte may contain, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride and the like are added It is possible. In some cases, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.

The present invention also provides a battery pack including the secondary battery and a device including the battery pack, wherein the device is used for a mobile phone, a tablet computer, a notebook computer, a power tool, a wearable electronic device, an electric vehicle, , A plug-in hybrid electric vehicle, and a power storage device.

Since the devices are well known in the art, a detailed description thereof will be omitted herein.

As described above, the battery case according to the present invention is configured such that the polymer resin layer constituting the outermost layer of the battery case includes polytetrafluoroethylene (PTFE) material, Defective appearance of the battery case can be prevented, deformation and damage of the battery case can be prevented, and the internal electrode assembly can be more stably protected.

1 is a schematic view schematically showing a cross-sectional structure of a conventional pouch-shaped battery case;
2 is a schematic view schematically showing a cross-sectional structure of a battery case according to an embodiment of the present invention;
3 is a schematic view schematically showing a cross-sectional structure of a battery case according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

FIG. 2 is a schematic view schematically showing a cross-sectional structure of a battery case according to an embodiment of the present invention.

2, the battery case 200 includes a first polymer resin layer 250, a metal layer 230, and a second polymer resin layer 210 sequentially from the inner surface of the battery case 200 facing the electrode assembly As shown in Fig.

The first polymer resin layer 250, the metal layer 230, and the second polymer resin layer 210 may be formed such that the sheet forming each layer does not affect the operation of the battery. The non-reactive adhesive layers 220 and 240, Respectively.

The first polymer resin layer 250, the metal layer 230 and the second polymer resin layer 210 have thicknesses of 30 μm, 35 μm and 15 μm, respectively, and the first polymer resin layer 250, Each of the non-reactive adhesive layers 220 and 240 located between the metal layer 230 and the second polymer resin layer 210 is configured to form a thickness of 3 mu m.

The second polymer resin layer 210 includes a PTFE-based material. Accordingly, even if the second polymer resin layer 210 is in contact with an electrolyte solution leaking or flowing out in the process of impregnating the electrode assembly with the electrolyte solution, It is possible to prevent the battery case from being deformed and damaged, and to protect the inner electrode assembly more stably.

3 is a schematic view schematically showing a cross-sectional structure of a battery case according to another embodiment of the present invention.

3, the second polymer resin layer 310 is formed by adding fine particles 311 in a state in which PTFE is dissolved in a solvent onto the metal layer 330 in a spraying manner. More specifically, the fine particles 311 Is added on the adhesive layer 320 which is added on the metal layer 330.

When the second polymer resin layer 310 is formed by adding the PTFE to the metal layer 330 in the form of fine particles 311 in the state where the PTFE is dissolved in the solvent and forming the second polymer resin layer 310 The desorption phenomenon of the second polymer resin layer 310 can be more easily prevented as compared with the case where the sheet is adhered by an adhesive.

The remaining structure including the first polymer resin layer 350 of the battery case and the adhesive layer 340 between the first polymer resin layer 350 and the metal layer 330 is the same as that of FIG. do.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (20)

And a separator interposed between the positive electrode and the negative electrode, wherein the first polymeric resin layer, the metal layer, and the first polymeric resin layer are formed from the inner surface of the battery case facing the electrode assembly, Wherein the second polymer resin layer constituting the outermost layer comprises a polytetrafluoroethylene (PTFE) material, and the second polymer resin layer comprises a polytetrafluoroethylene As a result,
The second polymer resin layer is formed by adding fine particles in a state in which PTFE is dissolved in a solvent onto the metal layer in an injection manner,
Wherein the spraying method is any one selected from the group consisting of a spray coating method, an ink jet coating method, a slit coating method, a die coating method, a spin coating method, and an electrospray coating method. The battery case according to claim 1, wherein a thickness of the first polymer resin layer is 20 占 퐉 to 40 占 퐉. The battery case according to claim 1, wherein the thickness of the metal layer is 25 占 퐉 to 45 占 퐉. The battery case according to claim 1, wherein the thickness of the second polymer resin layer is 5 to 25 占 퐉. The laminated structure of the first polymer resin layer, the metal layer and the second polymer resin layer according to claim 1, wherein the sheet forming each layer is a non-reactive adhesive which does not affect the operation of the battery, Wherein the battery case is formed by a dry lamination method in which the battery case is attached to the battery case. The battery case according to claim 5, wherein the non-reactive adhesive is a silicone polymer adhesive or a carbon fiber optical polymer adhesive. delete delete The method of claim 1, wherein the first polymer resin layer comprises at least one of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinylidene fluoride (PVdF), polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), and polyacrylonitrile Wherein the battery case is made of one or more materials selected from the group consisting of polyvinyl chloride (PVC) The battery case according to claim 1, wherein the metal layer is an aluminum layer. A secondary battery comprising the battery case according to claim 1. 12. The secondary battery according to claim 11, wherein the secondary battery is manufactured by injecting an electrolyte into the accommodating portion and sealing the electrode assembly while the electrode assembly is mounted on the accommodating portion of the battery case. 13. The secondary battery according to claim 12, wherein the electrode assembly has a structure in which a cathode sheet and a cathode sheet having a separator sheet interposed therebetween are wound. 13. The secondary battery according to claim 12, wherein the electrode assembly has a structure in which an anode, a cathode, and a separator interposed between the anode and the cathode are sequentially stacked. 13. The secondary battery according to claim 12, wherein the electrode assembly has a structure in which unit cells of a laminated structure composed of an anode, a cathode, and a separator interposed between the anode and the cathode are continuously wound by a separation film. 12. The secondary battery according to claim 11, wherein the secondary battery is a lithium secondary battery. A battery pack comprising a secondary battery according to claim 11. A device comprising a battery pack according to claim 17. 19. The device of claim 18, wherein the device is selected from the group consisting of a cell phone, a tablet computer, a notebook computer, a power tool, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug- . ≪ / RTI > The battery case according to claim 1, wherein no separate adhesive layer is provided between the metal layer and the second polymer resin layer.

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