KR20160010080A - Electrode Assembly Having Position-Variable Lead Joint And Battery Cell Contaning The Same - Google Patents

Abstract

The present invention relates to a battery cell having an electrode assembly of a positive electrode/isolation layer/negative electrode structure sealed in a battery case with an electrolyte wherein the electrode assembly comprises two or more positive electrode plates and two or more negative electrode plates. The positive and negative electrode plates include electrode tab portions consisting of uncoated portions which are not coated with active materials, respectively. The electrode tab portions are formed on each end portion of the electrode plates at the size corresponding to the width length of the electrode assembly. The positive electrode tab portion of the positive electrode plate is positioned on one side of the electrode assembly, and the negative electrode tab portion of the negative electrode plate is positioned on the side facing the positive electrode tab portion. On one end portion where the electrode tab portions are laminated, the electrode tab-lead coupling portion, in which the electrode tab portions and the electrode lead are electrically connected to each other in an arbitrary position, is formed.

Description

[0001] The present invention relates to an electrode assembly including a variable-position electrode tap-lead-coupling portion and a battery cell including the electrode assembly.

The present invention relates to an electrode assembly composed of a position variable electrode tab-lead-coupling portion and a battery cell including the electrode assembly.

As technology development and demand for mobile devices are increasing, the demand for batteries as energy sources is rapidly increasing, and accordingly, a lot of researches on batteries capable of meeting various demands have been conducted.

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

Also, the secondary battery is classified according to how the electrode assembly having the anode / separator / cathode structure is formed. Typically, the long battery-shaped anodes and cathodes are jelly- A stacked (stacked) electrode assembly in which a plurality of positive electrodes and negative electrodes cut in units of a predetermined size are sequentially stacked with a separator interposed therebetween, a stacked (stacked) electrode assembly in which a predetermined unit of positive and negative electrodes are stacked, A stack / folding type electrode assembly having a structure in which a bi-cell or a full cell stacked in a single state is wound is exemplified.

FIG. 1 schematically shows a general structure of a typical prior art stacked electrode assembly as a side view.

1, the stacked electrode assembly 10 includes a positive electrode 20 on both surfaces of which a positive electrode active material 22 is applied and a negative electrode active material 32 on both surfaces of the negative electrode current collector 31, Is applied to the cathode 30, and the cathode 30 is laminated in that order with the separator 80 interposed therebetween.

One end of each of the positive electrode current collector 21 and the negative electrode current collector 31 is electrically connected to the positive electrode lead 60 and the negative electrode lead (not shown) constituting electrode terminals of a battery A plurality of positive electrode tabs 40 and negative electrode tabs 50, each of which is composed of an uncoated portion to which no active material is applied, are protruded. In general, the positive electrode tabs 40 and the negative electrode tabs 50 are formed by notching a non-coated portion where no active material is applied, and cutting the non-coated portion in such a manner that the electrode tabs protrude from the pre- .

The positive electrode tabs 40 and the negative electrode tabs 50 protruded by the notching process are connected in a dense form and connected to the positive electrode lead 60 and the negative electrode lead, respectively. Such a structure can be more easily confirmed in FIG. 2, which is schematically shown as a partial enlarged view of the coupling portion of the electrode tabs and the electrode lead.

2, a plurality of positive electrode tabs 40 protruding from the positive electrode collector 21 of the electrode assembly 10 and a plurality of negative electrode tabs 40 extending from the negative electrode collector 31 50 are connected to the positive electrode lead 60 and the negative electrode lead 70, respectively, for example, in the form of a bonded portion integrally bonded by welding.

However, in recent years, a new type of battery cell is required due to a slim type or various design trends.

In addition, since the above-described battery cells include an electrode assembly having the same size or capacity, in order to obtain a novel structure considering the design of a device to which the battery cell is applied, it is necessary to reduce the capacity of the battery cell, There is a problem that the design of the device needs to be changed.

Particularly, when the electrical connection method and the connection position change greatly depending on the device to be applied, there is a possibility that the position where the electrode leads are coupled varies in various ways. Thus, the non-conductive portion formed on the electrode current collector is subjected to the notching process Therefore, it is difficult to manufacture the battery cell due to the complicated manufacturing process of cutting the electrode tabs protruding from the electrode tabs.

Accordingly, there is a great need for a technique capable of solving these 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.

Specifically, it is an object of the present invention to provide an electrode tab-lead coupling portion in which electrode tab portions and electrode leads are electrically connected at an arbitrary position at one side end where electrode tab portions are stacked, And it is an object of the present invention to provide a battery cell which can be efficiently mounted on a device of a battery, and which can simplify a manufacturing process without requiring a separate notching step for forming an electrode tab.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a battery cell having a structure in which an electrode assembly having a positive electrode / separator / negative electrode structure is sealed in a battery case together with an electrolyte,

Wherein the electrode assembly comprises at least two positive plates and at least two negative plates;

Wherein the positive electrode plate and the negative electrode plate each include an electrode tab portion composed of an uncoated portion to which no active material is applied, and the electrode tab portion is formed at an end portion of the electrode plate with a size corresponding to the width of the electrode assembly;

The positive electrode tab portion of the positive electrode plate is located at one side of the electrode assembly, and the negative electrode tab portion of the negative electrode plate is located at the opposite side of the positive electrode tab portion;

And an electrode tab-lead coupling portion is formed at one end of the electrode tab portion where the electrode tab portions are stacked. The electrode tab-lead coupling portion is electrically connected to the electrode tab portions at an arbitrary position.

That is, in the battery cell according to the present invention, the electrode tab portions and the electrode leads are electrically connected to each other at an arbitrary position on one side of the electrode tab portions where the electrode tab portions are stacked, whereby the positive electrode tab and the negative electrode plate Since the electrode tabs can be positioned in a wide area on one side and the electrode leads are coupled to various positions according to the device applied to one side end where the electrode tabs are stacked, And it is possible to provide an effect of simplifying the manufacturing process without requiring a separate notching step for forming the electrode tabs.

In the present invention, the electrode lead is not particularly limited as long as it is made of a material capable of electrically connecting the electrode tab portions, and may be preferably a metal plate. Examples of such a metal plate include an aluminum plate, a copper plate, a nickel plate, a nickel-coated copper plate, and an SUS plate.

In addition, the electrode leads may be connected to the electrode tabs in various ways, preferably by mechanical fastening or welding, and may be connected more stably when the electrode tabs and the electrode leads are connected by welding For example, ultrasonic welding, laser welding, resistance welding, or the like.

In the present invention, the electrode lead may have a shape for joining with the electrode tab portions and may have a straight line shape in a longitudinal vertical section, but the present invention is not limited to this structure.

In one specific example, it is preferable that the width of the electrode tab-lead coupling portion where the electrode tab portions are coupled is relatively large relative to the width of the conventional coupling portion which is engaged with the protruded electrode tab corresponding to the size of the electrode lead can do. In this case, the electrode lead may have a structure in which the width of the portion where the electrode tabs are coupled is larger by 10 to 400% than the width of the remaining electrode leads.

According to this structure, since the electrode leads are coupled to a wider range of electrode tab portions, it is possible to provide an effect of improving the bonding force of the electrode tab-to-lead coupling portions.

As described above, according to the present invention, the electrode leads may be connected to various positions according to a device applied to one end of the electrode tab portions, It is possible to deform.

In one specific example, it is possible for the electrode leads coupled to the positive electrode tab portion and the electrode leads for coupling to the negative electrode tab portion to be coupled in parallel directions. Specifically, the electrode leads that are coupled to the positive electrode tabs are located on one side of the upper end of the electrode assembly, and are coupled to the negative electrode tabs in a symmetrical manner with respect to the horizontal cross section with respect to the center of the electrode assembly.

In addition, the electrode leads that are coupled to the positive electrode tab portions are located on one side of the upper end of the electrode assembly and are coupled to the negative electrode tab portions in a symmetrical manner in a diagonal direction with respect to the center portion of the electrode assembly, , The electrode lead that is coupled to the positive electrode tab portion is located at the upper left side of the electrode assembly and the electrode lead that is coupled to the negative electrode tab portion is located at the lower right side of the electrode assembly. It is possible to form an electrode tab-lead coupling portion connected to the electrode tab-lead coupling portion.

In another specific example, the electrode tab-to-lead coupling portion may be formed such that the electrode leads for coupling to the positive electrode tab portion and the electrode leads for coupling to the negative electrode tab portion are coupled to each other in a direction perpendicular to each other. Specifically, the electrode leads, which are to be coupled to the positive electrode tab portions, are positioned at the upper left side of the upper left side of the electrode assembly, and the electrode leads that are coupled to the negative electrode tab portions are coupled to the electrode tabs .

In contrast, the electrode leads that are coupled to the positive electrode tab portions are positioned vertically to the upper left side of the upper end of the electrode assembly, and the electrode leads that are coupled to the negative electrode tab portions are positioned in a direction perpendicular to the electrode leads That is, in the lower direction.

Since the position of the electrode tab-lead coupling portion and the structure of the electrode lead can be formed in any position and shape according to the position or shape of the device and the electrically coupled members to be applied, It is possible to stably apply the present invention to devices of various types without needing to perform the notching process.

The electrode assembly is not particularly limited as long as it has a structure in which a plurality of electrode tabs are connected to form an anode and a cathode. Preferably, the electrode assembly has a winding structure, a stack structure, and a stack / folding structure. Details of the stacked / folded structure of the electrode assembly are disclosed in Korean Patent Application Laid-Open Nos. 2001-0082058, 2001-0082059 and 2001-0082060, the contents of which are incorporated herein by reference. As a reference.

The battery cell according to the present invention can be suitably applied to a pouch-shaped battery cell in which an electrode assembly is embedded in a housing of a pouch-shaped case of a laminate sheet including a metal layer and a resin layer, for example, an aluminum laminate sheet.

Such a battery cell may be, for example, a lithium ion battery or a lithium secondary battery in one example, but is not limited thereto.

For reference, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte solution 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 is 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 300 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.

The non-aqueous 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, 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 present invention also provides a device comprising at least one battery pack, wherein the device is a mobile phone, a portable computer, a smart phone, a tablet PC, a smart pad, a netbook, a LEV (Light Electronic Vehicle) An electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.

The structure of these devices and their fabrication methods are well known in the art, and a detailed description thereof will be omitted herein.

As described above, the battery cell according to the present invention includes the electrode tab-lead coupling portion in which the electrode tab portions and the electrode leads are electrically connected to each other at an arbitrary position on one side of the electrode tab portions, It is possible to efficiently mount the device on various types of devices, and it is possible to simplify the manufacturing process without requiring a separate notching step for forming the electrode tabs.

1 is a schematic diagram of a general structure of a conventional stacked electrode assembly;
FIG. 2 is an enlarged view of a portion of the electrode assembly of FIG. 1 in which the electrode tabs are coupled in a densely packed manner and connected to the electrode leads;
3 is a schematic view of the structure of an electrode assembly according to one embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of the electrode assembly of FIG. 3 in which the electrode tabs are connected in a densely packed manner and connected to the electrode leads;
5 to 9 are schematic views of electrode tab-and-lead joints in an electrode assembly according to still another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 3 is a schematic view of a structure of an electrode assembly according to an embodiment of the present invention.

3, the electrode assembly 100 includes a cathode 120 on which cathode active material 122 is coated on both surfaces of a cathode current collector 121, and a cathode active material 132 on both surfaces of the anode current collector 131 And the cathodes 130 which are applied are sequentially stacked with the separator 180 interposed therebetween.

In order to be electrically connected to the positive electrode lead 160 and the negative electrode lead 170 constituting the electrode terminal of the battery cell (not shown) at one side end of the positive electrode current collector 21 and the negative electrode current collector 31, And a plurality of positive electrode tab portions 140 and negative electrode tab portions 150 each of which is made of an uncoated portion to which no active material is applied. The positive electrode tab portions 140 are disposed on one side of the electrode assembly 100 and the negative electrode tab portions 150 are disposed on opposite sides of the positive electrode tab portions 140.

FIG. 4 schematically shows an enlarged view of a portion of the electrode assembly shown in FIG. 3 that is coupled to the electrode leads in a densely packed manner.

4, the positive electrode current collector 121 of the electrode assembly 100 includes a plurality of positive electrode tab portions 140 and a negative electrode current collector 131, which are not coated with active material, The plurality of negative electrode tab portions 150 made of a non-coated portion are formed at the ends of the positive electrode collector 121 and the negative electrode collector 131 in a size corresponding to the width of the electrode assembly 100.

In this structure, the positive electrode lead 160 and the negative electrode lead 170 are formed in a state in which one side end where the positive electrode tab portions 140 are stacked and the other end side where the negative electrode tab portions 150 are stacked are disposed in parallel to each other The positive electrode tab-to-lead joint portion 181 and the negative electrode tab-to-lead joint portion 182 are formed in the form of a welded portion integrally joined by welding.

5 to 9 are schematic views of electrode tab-and-lead joints in an electrode assembly according to still another embodiment of the present invention.

5, the positive electrode lead 260 and the negative electrode lead 270 may have a first end where the positive electrode tab portions 240 are stacked and a second end where the negative electrode tab portions 250 are stacked, And the negative electrode tab-and-lead engaging portion 281 and the negative electrode tab-and-lid engaging portion 282 are formed in the form of a welded portion integrally joined by welding in a state of being positioned.

The positive electrode lead 260 and the negative electrode lead 270 are connected to the positive electrode tab-lead coupling portion 281 and the negative electrode tab-lead coupling portion 182, respectively, to which the positive electrode tab portions 240 and the negative electrode tab portions 250 are coupled, Of the positive electrode lead 2160 and the negative electrode lead 270 by a range of 100% based on the width of the remaining positive electrode lead 2160 and the negative electrode lead 270. With this structure, since welding is performed in a wider range, it is possible to provide an effect of improving the bonding force between the positive electrode tab-and-lead coupling portion 281 and the negative electrode tab-and-lead coupling portion 282.

6 and 7, the positive electrode lead 360 and the negative electrode lead 370 are connected to each other at one side end where the positive electrode tab portions 340 are laminated and at one side end where the negative electrode tab portions 350 are stacked The positive electrode tab-to-lead joint portion 381 and the negative electrode tab-to-lead joint portion 382 are formed in the form of a welded portion integrally joined by welding in a state of being located in a parallel direction.

6, the positive electrode lead 360 is positioned on the upper left side of the positive electrode tab portions 340 and the negative electrode lead 370 is disposed on the negative electrode tab portions 350 in a shape symmetrical to the horizontal cross- 7, the positive electrode lead 360 is positioned on the upper left side of the upper end of the positive electrode tab portions 340, and the negative electrode lead 370 is positioned on the lower left side of the upper electrode tab portion 340, May be positioned in the lower right side of the negative electrode tab portions 350 in a diagonal symmetrical manner with respect to the negative electrode tab portion B and may be coupled in a direction parallel to each other.

8 and 9, the positive electrode lead 460 and the negative electrode lead 470 are connected to each other at one side end where the positive electrode tab portions 440 are stacked and at one side end where the negative electrode tab portions 450 are stacked The positive electrode tab-to-lead engaging portion 481 and the negative electrode tab-to-lead engaging portion 482 are formed in the form of a welded portion integrally welded by being positioned in a vertical direction.

8, the positive electrode lead 460 is positioned on the left upper end of the positive electrode tab portions 440 and the negative electrode lead 470 is disposed on the negative electrode tab portions 440 in a shape symmetrical to the horizontal end surface A ' The positive electrode lead 460 is positioned on the upper left side of the upper portion of the positive electrode tab portions 440 and the negative electrode lead 470 is positioned on the left side of the lower portion of the lower electrode 460 in the vertical direction May be positioned on the lower right side of the negative electrode tab portions 450 in a diagonal direction symmetrical to the end surface B 'and may be coupled to each other in a perpendicular direction.

As shown in the above-mentioned structures, in the electrode assembly of the electrode assembly, the electrode tabs and the electrode leads are electrically connected to each other at an arbitrary position on one side of a plurality of electrode tab portions composed of an uncoated portion, Since the tab-to-lead coupling portion is formed, it is possible to efficiently mount the device to various types of devices according to a device to be applied, and it is possible to simplify a manufacturing process without requiring a separate notching process for forming a conventional electrode tab .

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (15)

A battery cell having a structure in which an electrode assembly having a positive electrode / separator / negative electrode structure is sealed inside a battery case together with an electrolyte,
Wherein the electrode assembly comprises at least two positive plates and at least two negative plates;
The positive electrode plate and the negative electrode plate each include an electrode tab portion composed of an uncoated portion to which an active material is not applied, and the electrode tab portion is formed at an end portion of the electrode plate with a size corresponding to the width of the electrode assembly;
The positive electrode tab portion of the positive electrode plate is located at one side of the electrode assembly, and the negative electrode tab portion of the negative electrode plate is located at the opposite side of the positive electrode tab portion;
Wherein an electrode tap-lead coupling portion is formed at one end of the electrode tab portion where the electrode tab portions are stacked, the electrode tab portion and the electrode lead being electrically connected to each other at an arbitrary position. The battery cell according to claim 1, wherein the electrode lead is a metal plate. The battery cell according to claim 2, wherein the metal plate is selected from an aluminum plate, a copper plate, a nickel plate, a nickel-coated copper plate, and an SUS plate. The battery cell according to claim 1, wherein the electrode lead has a straight line shape in a longitudinal vertical direction. The battery cell according to claim 1, wherein the electrode lead has a relatively wide width of the electrode tab-lead coupling portion to which the electrode tabs are coupled. The battery cell according to claim 5, wherein a width of the electrode tab-to-lead coupling portion is 10 to 400% larger than a width of the remaining electrode leads. The battery cell according to claim 1, wherein the electrode tabs and the electrode leads are coupled by mechanical fastening or welding. The battery cell according to claim 7, wherein the welding is ultrasonic welding.  The battery cell according to claim 1, wherein the electrode leads coupled to the positive electrode tabs and the electrode leads connected to the negative electrode tabs are coupled in parallel directions.  The battery cell according to claim 1, wherein the electrode leads coupled to the positive electrode tabs and the electrode leads coupled to the negative electrode tabs are coupled to each other in a direction perpendicular to each other. The battery cell according to claim 1, wherein the electrode assembly is of a winding type, a stack type, or a stack / folding type. The battery cell according to claim 1, wherein the battery case comprises a laminate sheet including a resin layer and a metal layer. The battery cell according to claim 1, wherein the battery cell is a lithium secondary battery. A device comprising at least one battery cell according to any one of claims 1 to 13. 15. The method of claim 14, wherein the device is selected from the group consisting of a mobile phone, a portable computer, a smart phone, a smart pad, a netbook, a wearable electronic device, a LEV (Light Electronic Vehicle), an electric vehicle, a hybrid electric vehicle, Device. ≪ / RTI >

Images