KR20160021514A - Jelly-Roll Type Electrode Assembly of Improved Stability and Battery Cell Comprising the Same - Google Patents

Abstract

The present invention relates to a jelly-roll type electrode assembly and a battery cell comprising the same. The jelly-roll type electrode assembly, which is formed by being wound while a separator sheet is placed between a positive electrode sheet and a negative electrode sheet, comprises a fixing tape for attaching a jelly-roll wound end portion to the outer peripheral surface of the electrode assembly. The fixing tape contains an adsorptive material which can adsorb water (H_2O) that is introduced from the outside of the battery cell or generated in the battery cell, or carbon dioxide (CO_2) that is generated during the abnormal operation state of a battery or at high temperatures. The adsorptive material adsorbs water and carbon dioxide which causes the ignition and explosion of the battery at high temperatures and separates the same from the internal environment of the battery, so as to suppress side reaction and swelling phenomena of an electrolyte, thereby greatly enhancing the stability of the battery.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a jelly-roll type electrode assembly having improved safety and a battery cell including the jelly-roll type electrode assembly.

The present invention relates to a jelly-roll type electrode assembly having improved safety and a battery cell including the jelly-roll type electrode assembly.

As technology development and demand for mobile devices are increasing, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, lithium secondary batteries having high energy density and voltage, long cycle life and low self- It has been commercialized and widely used.

However, the conventional lithium secondary battery has a risk of ignition / explosion when exposed at a high temperature. Also, even if large current flows in a short time due to overcharge, external short circuit, nail penetration, local crush, etc., there is a risk of ignition / explosion as the battery is heated by IR heat.

Specifically, when the temperature of the battery rises, the reaction between the electrolyte and the electrode is promoted. As a result, a reaction heat is generated and the temperature of the battery further rises, which again accelerates the reaction between the electrolyte and the electrode. Therefore, the temperature of the battery rapidly increases, which again accelerates the reaction between the electrolyte and the electrode. Such a vicious circle causes a thermal runaway phenomenon in which the temperature of the battery rises sharply, and when the temperature rises to a certain level or higher, the battery may ignite.

Further, when the lithium secondary battery is used and stored for a long time or at a high temperature, the electrolytic solution is decomposed or a gas such as carbon dioxide is generated as a result of the reaction between the electrolytic solution and the electrode, The lithium secondary battery explodes. Such a risk of ignition / explosion is the most fatal disadvantage of the lithium secondary battery.

Therefore, it is necessary to secure safety for the development of lithium secondary batteries.

As a method of using the material inside the cell, there is a method of adding an additive for improving the safety to the electrolytic solution or the electrode. The chemical safety device does not require additional process and space, and has the advantage that it can be applied to all kinds of cells, but the performance of the battery is deteriorated due to the addition of the material. These materials include a material forming a floating film on the electrode and a material increasing the resistance of the electrode due to the volume expansion during temperature rise. However, each of these has a problem in that byproducts are generated during the formation of the floating film, which deteriorates the performance of the battery, or the volume of the battery is large, thereby reducing the capacity of the battery.

In addition, although process control is performed in order to minimize the inflow of water in the battery manufacturing process, there is a problem that it is difficult to remove moisture existing in the electrode active material.

Therefore, there is a high need for development of novel chemical safety measures to prevent ignition / explosion without deteriorating the overall performance of the battery.

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 developed an anti-loosening fixing tape for a jelly-roll type electrode containing an adsorbent material capable of adsorbing water or carbon dioxide which may be generated during charging and discharging of the battery, after intensive research and various experiments The present inventors have found that the use of such a fixing tape improves the swelling phenomenon and greatly improves the safety of the battery, and has accomplished the present invention.

According to an aspect of the present invention, there is provided a jelly-roll type electrode assembly,

A jelly-roll type electrode assembly formed by winding a separator sheet between a cathode sheet and a cathode sheet, wherein the electrode assembly includes a fixing tape for attaching the winding end of the jelly-roll to the outer circumferential surface of the electrode assembly (H ₂ O) flowing from the outside of the battery cell or generated in the battery cell, or an adsorbent material capable of adsorbing carbon dioxide (CO ₂ ) generated at an abnormal operating state or a high temperature of the battery .

The above-mentioned " abnormal operating condition or high temperature of the battery " refers to a temperature of the battery in a normal operation state due to an abnormal reaction of the electrolyte and / or the electrode during an operation process of the battery such as overcharge, external or internal short circuit, needle penetration, local damage, Or more.

On the contrary, the adsorptive substance of the present invention is a substance separating moisture or carbon dioxide from the internal environment of the cell by adsorption, and is not particularly limited as long as it has the effect of adsorbing moisture or carbon dioxide and does not affect the operation of the cell.

Such adsorbent materials include, for example, BaTiO ₃ , PB (Mg ₃ Nb _2/3 ) O ₃ -PbTiO ₃ (PMN-PT), hafnia (HfO ₂ ) SrTiO ₃ , SnO ₂ , CeO ₂ , MgO, NiO, _{CaO, ZnO, ZrO 2, Y} 2 O 3, Al 2 O 3, TiO 2, soda lime, amine-graft (grafted) zeolite, Li-silica, NaOH, Ca (OH) ₂ and selected from the group consisting of KOH 1 Or may be a mixture of two or more kinds of substances, and more specifically, it may be at least one selected from the group consisting of CaO.

The fixing tape may include a tape base material made of an adsorbent material and a polymer material in order to improve the adsorption property to water or carbon dioxide and a structure in which a pressure-sensitive adhesive is added to one surface of the fixing tape base so as to fix the wound jelly- ≪ / RTI >

The polyolefin-based polymer that can be used as the polymer material is not only low in hygroscopicity, but also has heat-sealability (thermal adhesiveness) and can inhibit the penetration of the electrolyte, while it is not expanded or eroded by the electrolyte. The polyolefin-based polymer may be, for example, selected from the group consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyimide (PI).

In one specific example, the fastening tape is affixed to prevent unwinding after the jelly-roll is wound, and is attached to wrap the outer surface of the jelly-roll while passing through the winding termination line where the winding of the jelly- Therefore, loosening can be prevented stably.

In the jelly-roll type electrode assembly according to the present invention, the fixing tape may cover 5% to 100% of the entire outer peripheral surface area of the jelly-roll type electrode assembly. When the fixing tape covers less than 5% of the total area of the outer circumferential surface of the jelly-roll, it is not preferable because the adsorbability to moisture and / or carbon dioxide can not be sufficiently exhibited. Thus, the area of the fixing tape may be in a range of 10% to 90%, and more specifically, in a range of 20% to 80% based on the total area of the outer peripheral surface of the electrode assembly.

In one specific example, the length h of the anchoring tape may be between 30% and 100% based on the longitudinal length (H) of the jelly-roll type electrode assembly. If the length of the fixing tape is less than 30% based on the longitudinal length of the jelly-roll type electrode assembly, it is difficult to achieve the object of preventing the jelly-roll from loosening and the adsorption of moisture and / or carbon dioxide can not be sufficiently exhibited. If it exceeds 100%, surplus portions of the fixing tape are formed on both ends of the jelly-roll, which is not preferable because the increase in volume may cause a problem in inserting the jelly-roll type electrode assembly into the battery case. More specifically, the length of the fixing tape may be 40% to 95% of the longitudinal length of the jelly-roll type electrode assembly, and more particularly, 50% to 90% of the longitudinal length of the electrode assembly.

In addition, in the jelly-roll type electrode assembly according to the present invention, the fixing tape must be able to prevent unwinding of the jelly-roll wound while being attached to a position passing through the winding termination line of the jelly- It is preferable that the longitudinal length of the winding traverse line is longer than the transverse traverse length, and may be a polygonal shape having a longer length based on the plane shape. Specifically, the polygon may be a rectangle, and the shape of the outer periphery may be a straight line, a curved line, or a zigzag, even though the rectangle has a generally rectangular shape.

In one specific example, the adsorptive material may be embedded or coated on the tape substrate. When the tape substrate is embedded in the tape substrate, the tape substrate and the adsorptive material are not separated from each other. Therefore, And when it is applied to a tape base material, the adsorbing material can be sufficiently exerted on water and / or carbon dioxide since it is formed on the outer surface of the tape.

On the other hand, the tape base material may be a porous film. When a fixing tape is formed with a structure in which an adsorbing material is introduced into the pores of the porous film, the adsorbing material may be inserted into the pores, It is possible to uniformly mix the tape base material and the adsorptive material as well as to allow the moisture and / or carbon dioxide to pass through the pores, so that there is no fear of lowering the adsorption force.

In yet another specific example, the adsorptive material may be mixed in a tackifier attached to one side of the tape substrate. As the adsorbent material is not only buried or coated on the tape substrate but also mixed with the adhesive agent, the distribution range of the adsorbent material is widened and mixed with the adhesive agent which is in direct contact with the jelly-roll type electrode assembly which generates water and / or carbon dioxide, Can be further improved, so that the safety of the battery can be increased.

The content of the adsorptive material may be in the range of 0.02 wt% to 30 wt% based on the total weight of the fixing tape. If the adsorbing material is less than 0.02% by weight based on the total weight of the fixing tape, the adsorbability to moisture and / or carbon dioxide can not be sufficiently exhibited. If the adsorbing material is more than 30% by weight, the polyolefin- The required mechanical properties can not be sufficiently satisfied, which is not preferable. Accordingly, the content of the adsorbent may be in the range of 0.1 wt% to 28 wt%, and more specifically, in the range of 0.5 wt% to 20 wt% based on the total weight of the fixing tape.

The thickness of the fixing tape attached to the jelly-roll according to the present invention may be 10 탆 to 500 탆. If the thickness of the fixing tape is thinner than 10 탆, the content of the adsorbed material is decreased, so that the adsorption of water and / or carbon dioxide can not be sufficiently exhibited. If the thickness is larger than 500 탆, the volume of the entire jelly- It is not preferable because a battery cell of one size can not be formed. More specifically, the thickness of the fixing tape may be 30 탆 to 300 탆, more specifically, 50 탆 to 200 탆.

The jelly-roll type electrode assembly may include a positive electrode / separator / negative electrode structure embedded in a battery case in a state where the electrode assembly is impregnated with an electrolyte to constitute a lithium secondary battery.

The positive electrode is prepared by applying a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector, followed by drying. If necessary, a filler may be further added. The negative electrode is also manufactured by applying a negative electrode material onto the negative electrode collector and drying it, and if necessary, may further include components such as a conduction regulator, a coupling agent, an adhesion promoter and a molecular weight regulator.

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; A lithium manganese oxide such as Li _{1 + x} Mn _2-x O ₄ (where x is 0 to 0.33), 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.

Examples of the negative electrode active material include carbon and graphite materials such as natural graphite, artificial graphite, expanded graphite, carbon fiber, non-graphitizable carbon, carbon black, carbon nanotube, fullerene and activated carbon; Metals such as Al, Si, Sn, Ag, Bi, Mg, Zn, In, Ge, Pb, Pd, Pt and Ti which can be alloyed with lithium and compounds containing these elements; Complexes of metals and their compounds and carbon and graphite materials; Lithium-containing nitrides, and the like. Among them, a carbon-based active material, a silicon-based active material, a tin-based active material, or a silicon-carbon based active material is more preferable, and these may be used singly or in combination of two or more.

The pore diameter of the separation membrane is generally 0.01 to 10 mu m, and the thickness is generally 5 to 300 mu m. As such a separation membrane, for example, a sheet or a nonwoven fabric made of an olefin-based polymer such as polypropylene which is chemically resistant and hydrophobic, 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.

Examples of the binder include polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene - diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers, highly polymerized polyvinyl alcohol and the like.

The conductive material is a component for further improving the conductivity of the electrode active material, and may be added in an amount of 1 to 30 wt% based on the total weight of the electrode material mixture. 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; Carbon fibers such as carbon nanotubes and fullerene; conductive fibers such as carbon fibers and metal fibers; 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 filler is an auxiliary component for suppressing the expansion of the electrode. The filler is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery, and examples thereof include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The viscosity adjusting agent may be added up to 30% by weight based on the total weight of the electrode mixture, so as to control the viscosity of the electrode mixture so that the mixing process of the electrode mixture and the coating process on the collector may be easy. Examples of such viscosity modifiers include carboxymethylcellulose, polyvinylidene fluoride and the like, but are not limited thereto.

The coupling agent is an auxiliary component for increasing the adhesive force between the electrode active material and the binder. The coupling agent has two or more functional groups and can be used up to 30% by weight based on the weight of the binder. Such a coupling agent can be obtained by, for example, a method in which one functional group reacts with a hydroxyl group or a carboxyl group on the surface of a silicon, a tin, or a graphite active material to form a chemical bond and the other functional group reacts with a polymeric binder to form a chemical bond Lt; / RTI > Specific examples of the coupling agent include triethoxysilylpropyl tetrasulfide, mercaptopropyl triethoxysilane, aminopropyl triethoxysilane, chloropropyltriethoxysilane, triethoxysilane, vinyl triethoxysilane, methacryloxypropyl triethoxysilane, glycidoxypropyl triethoxysilane, isocyanatopropyl triethoxysilane, isocyanatopropyl triethoxysilane, ), And cyanatopropyl triethoxysilane. However, the present invention is not limited to these.

The adhesion promoter may be added in an amount of 10% by weight or less based on the binder, for example, oxalic acid, adipic acid, Formic acid, acrylic acid derivatives, itaconic acid derivatives, and the like.

As the molecular weight modifier, t-dodecylmercaptan, n-dodecylmercaptan, n-octylmercaptan and the like can be used. As the crosslinking agent, 1,3-butanediol diacrylate, 1,3-butanediol dimethacrylate, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, aryl acrylate, aryl methacrylate, trimethylolpropane triacrylate, tetraethylene glycol diacrylate, tetraethylene glycol dimethacrylate, Divinylbenzene and the like can be used.

The current collector in the electrode is a portion where electrons move in the electrochemical reaction of the active material, and an anode current collector and a cathode current collector exist depending on the type of the electrode.

The negative electrode current collector is generally made to have a thickness of 3 [mu] m to 500 [mu] m. Such an anode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery, and may be formed of a material such as copper, stainless steel, aluminum, nickel, titanium, fired carbon, surface of copper or stainless steel A surface treated with carbon, nickel, titanium, silver or the like, an aluminum-cadmium alloy, or the like can be used.

The cathode current collector generally has a thickness of 3 to 500 mu m. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery, and may be formed of a material such as stainless steel, aluminum, nickel, titanium, sintered carbon, or a surface of aluminum or stainless steel Treated with carbon, nickel, titanium, silver or the like may be used.

These current collectors may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, a non-woven fabric, or the like, by forming fine irregularities on the surface of the current collectors to enhance the binding force of the electrode active material.

The electrolytic solution is a lithium-containing non-aqueous electrolytic solution composed of a non-aqueous electrolyte and a lithium salt.

Examples of the nonaqueous electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, But are not limited to, lactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, Nitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxymethane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives , Tetrahydrofuran derivatives, ethers, methyl propionate, ethyl propionate and the like can be used.

The lithium salt is a material which is soluble in the non-aqueous liquid electrolyte and includes, 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.

In some cases, organic solid electrolytes, inorganic solid electrolytes, etc. may 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 A polymer including an acid dissociation group, 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.

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, etc. 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 battery cell according to the present invention can be manufactured by a conventional method known in the art. The structure of the positive electrode, the negative electrode and the separator in the battery cell according to the present invention is not particularly limited. For example, each of the sheets may be formed into a cylindrical shape, a square shape or a rectangular shape by a winding type or a stacking type. It may be inserted into a pouch-type case, and more particularly, it may be suitably used in a pouch-type case.

The present invention provides a battery pack comprising the battery cell as a unit cell and the battery pack.

The device may be used in a computer, a mobile phone, a power tool, an electric vehicle (EV), a hybrid electric vehicle, a plug-in hybrid electric vehicle, a motorcycle, an electric golf cart, .

As described above, in the jelly-roll according to the present invention, the moisture or carbon dioxide adsorbing material is contained in the fixing tape for preventing the jelly-roll from loosening, thereby adsorbing carbon dioxide, which is a cause of ignition and explosion of the battery in water and at high temperature, By separating the battery from the internal environment, electrolyte side reaction and swelling phenomenon can be suppressed and the safety of the battery can be greatly improved.

FIG. 1 is a schematic view showing a jelly-roll type electrode assembly with a fixing tape according to an embodiment of the present invention; FIG. And
2 is a schematic diagram showing an enlarged view of a tape base constituting the fixed tape of the present application.

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. 1 is a perspective view schematically showing a jelly-roll type electrode assembly with a fixing tape according to an embodiment of the present invention.

1, a jelly-roll type electrode assembly 100 is formed by winding a separator sheet between a cathode sheet and a cathode sheet. The jelly-roll type electrode assembly 100 includes a positive electrode tab 111 and a negative electrode tab 112, And the fixing tape 130 is attached so as to pass through the winding termination line 120 so that the wound jelly-roll is not loosened. The fixing tape is attached so as to surround the outer circumferential surface of the jelly-roll and covers 5% to 90% of the entire circumferential surface area.

Specifically, the length (h) of the fixing tape corresponds to 30% to 100% of the longitudinal length (H) of the jelly-roll type electrode assembly, and the shape of the fixing tape is a jelly- The roll should be prevented from being loosened. The roll should have a longer length (h) than the transverse length (w) based on the plane shape. Specifically, the roll has a rectangular shape as a whole.

Fig. 2 schematically shows an enlarged view of a tape base constituting the fixed tape of the present invention.

Referring to FIG. 2, the fixing tape includes a tape base material made of a polymer material. The tape base material is made of a porous film, and an adsorbent material (not shown) may be introduced into the pores formed in the porous film. have. However, the adsorbent material may be configured to be embedded or coated on the tape substrate, and the adsorbent material may be composed of a structure in which the adsorbent material is contained in the fixing tape in a state mixed with the adhesive agent attached to one surface of the tape substrate It is possible.

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 (18)

A jelly-roll type electrode assembly formed by winding a separator sheet between a positive electrode sheet and a negative electrode sheet,
The electrode assembly includes a fixing tape for attaching the jelly-roll winding end to the outer circumferential surface of the electrode assembly,
The fixing tape includes moisture (H ₂ O) flowing from the outside of the battery cell or generated in the battery cell, or an adsorbent material capable of adsorbing carbon dioxide (CO ₂ ) generated at an abnormal operating state or a high temperature of the battery Wherein the jelly-roll-type electrode assembly comprises: The method of claim 1, wherein the adsorbent material is selected from the group consisting of BaTiO ₃ , PB (Mg ₃ Nb _2/3 ) O ₃ -PbTiO ₃ (PMN-PT), hafnia (HfO ₂ ) SrTiO ₃ , SnO ₂ , CeO ₂ , , At least one selected from the group consisting of CaO, ZnO, ZrO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , TiO ₂ , NaOH, Ca (OH) ₂ and KOH. 3. The jelly-roll type electrode assembly of claim 2, wherein the adsorbent material is CaO. The jelly-roll type electrode assembly according to claim 1, wherein the fixing tape includes an adsorbent material and a tape base material made of a polymer material, and a pressure-sensitive adhesive is adhered to one surface of the tape base material. The jelly-roll type electrode according to claim 4, wherein the polymer material is any one selected from the group consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyimide Assembly. The jelly-roll type electrode assembly according to claim 1, wherein the fixing tape is attached so as to surround the outer surface of the electrode assembly while passing through the winding termination line where the winding of the jelly-roll type electrode assembly ends. The jelly-roll type electrode assembly according to claim 1, wherein the fixing tape covers 5% to 90% of the total area of the outer peripheral surface of the electrode assembly. The jelly-roll type electrode assembly according to claim 1, wherein the length (h) of the fixing tape is 30% to 100% based on the longitudinal length (H) of the electrode assembly. The jelly-roll type electrode assembly according to claim 1, wherein the fixing tape has a planar shape and a polygonal shape with a long length. The jelly-roll type electrode assembly according to claim 4, wherein the adsorbing material is embedded or coated on a tape substrate. The jelly-roll type electrode assembly according to claim 4, wherein the tape base material is a porous film, and an adsorbent material is introduced into the pores of the porous film. The jelly-roll type electrode assembly according to claim 4, wherein the adsorbing material is mixed with a pressure-sensitive adhesive. The jelly-roll type electrode assembly according to claim 1, wherein the content of the adsorbent is 0.02-30% by weight based on the total weight of the fixing tape. The jelly-roll type electrode assembly according to claim 1, wherein the fixing tape has a thickness of 10 탆 to 500 탆. The battery cell according to any one of claims 1 to 14, wherein the electrode assembly is embedded in the battery case with the electrolyte solution impregnated therein. 15. A battery pack comprising a battery cell according to claim 15 as a unit cell. A device comprising a battery pack according to claim 16. 18. The system of claim 17, wherein the device is a computer, a mobile phone, a power tool, an electric vehicle (EV), a hybrid electric vehicle, a plug- Lt; / RTI > system.

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