KR20170036203A - Pouch-typed Battery Cell Having Two or More Electrode Assemblies - Google Patents

Abstract

The present invention relates to a battery cell, comprising: a positive electrode; a negative electrode; electrode assemblies of a separator structure interposed between the positive and the negative electrode; and a battery case having an accommodation unit in which the electrode assemblies are embedded. At least two electrode assemblies are embedded in the accommodation unit in a planar array, and the electrode assemblies comprise independent electrode terminals exposed to the outside of the battery case.

Description

[0001] The present invention relates to a pouch-type battery cell having two or more electrode assemblies,

The present invention relates to a pouch-shaped battery cell comprising two or more electrode assemblies.

As information technology (IT) technology has developed remarkably, various portable information and communication devices have been spreading, and the 21st century has been developed into a "ubiquitous society" capable of providing high quality information services regardless of time and place.

As a development base for such a ubiquitous society, a lithium secondary battery occupies an important position. Specifically, the rechargeable lithium secondary battery is widely used as an energy source for wireless mobile devices, and is proposed as a solution for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels And also as an energy source for electric vehicles, hybrid electric vehicles, and the like.

As described above, as the devices to which the lithium secondary battery is applied are diversified, the lithium secondary battery has been diversified so as to provide a suitable output and capacity for the applied device. In addition, miniaturization is strongly demanded.

The lithium secondary battery may be classified into a cylindrical battery cell, a prismatic battery cell, and a pouch-shaped battery cell depending on its shape. Among them, a pouch-type battery cell which can be stacked with a high degree of integration, has a high energy density per unit weight, and is inexpensive and easy to deform is attracting much attention.

The pouch-shaped battery cell may be formed of a battery module or a battery pack by electrically connecting a plurality of pouch-shaped battery cells in order to be mounted on a device requiring a high output capacity.

FIG. 1 schematically shows a typical structure of a typical pouch-shaped battery cell including a stacked electrode assembly.

1, the battery cell 10 includes an electrode assembly 30 including a positive electrode, a negative electrode, and a separator disposed therebetween in a pouch-shaped battery case 20, The tabs 31 and 32 are welded to the two electrode leads 40 and 41 and sealed (sealed) so as to be exposed to the outside of the battery case 20.

The battery case 20 is made of a soft packaging material such as an aluminum laminate sheet and includes a case body 21 including a concave shaped storage portion 23 on which the electrode assembly 30 can be seated, And a lid 22 to which one side is connected.

Both sides of the battery case 20 are bent and vertically bent in the direction of the accommodating portion 23 in a state in which the battery case 20 is sealed in order to construct the outer peripheral surface of the battery cell 20 in a compact structure.

FIG. 2 schematically shows a general structure of a battery pack constructed from the pouch-shaped battery cells shown in FIG. 1, and FIG. 3 schematically shows an enlarged view on a vertical section of a region A Respectively.

Referring to FIG. 2, the battery pack 50 includes two battery cells 10. The battery cells 10 are arranged in a structure in which the side sealing portions 12 are in contact with the electrode terminals 11 in the same direction.

Referring to FIG. 3 together with FIG. 2, side sealing portions 12 of the battery cells 10 form a dead space 60 in which the electrode assembly 30 is not embedded, There is a problem in that the capacity of the battery is reduced by the space occupied by the side sealing portions 12 and the energy density is reduced under the structure in which the battery pack 50 is arranged by arranging the battery cells 50 in contact with the side surfaces.

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.

It is an object of the present invention to provide a battery cell capable of minimizing dead space and further ensuring space for accommodating an electrode assembly in a high-capacity / high-output battery using the pouch-shaped battery cell to increase the energy density.

According to an aspect of the present invention, there is provided a battery cell comprising:

An electrode assembly having a separator structure sandwiched between a cathode and an anode, and a battery case having a housing portion in which the electrode assemblies are embedded;

The electrode assemblies may include at least two electrode assemblies in a planar array, and the electrode assemblies may include independent electrode terminals exposed to the outside of the battery case, respectively.

Accordingly, the battery cell according to the present invention includes a plurality of electrode assemblies incorporated in one housing portion formed in one battery case, so that the conventional technique connects a plurality of pouch-shaped battery cells, Unlike the case where dead spaces are generated by the sealing parts, the dead space can be minimized, and thus the energy density can be increased by further securing the built-in space of the electrode assembly.

The electrode assemblies may be independently formed of a folding structure, a stacking structure, a stacking / folding structure, or a lamination / stacking structure.

The electrode structures of the folding type, the stacking type, the stacking / folding type, and the lamination / stacking type will be described in detail as follows.

First, the electrode assembly of the folding structure can be manufactured by coating a mixture containing an electrode active material on each metal current collector, placing the separator sheet between the anode and the cathode in the form of a sheet dried and pressed, and winding .

The electrode assembly of the stacked structure has a structure in which an electrode assembly is coated on each metal current collector, followed by drying and pressing, and then a separator is formed between the positive and negative electrode plates cut to a predetermined size and cut to a predetermined size corresponding to the positive and negative electrode plates And then laminating them.

The electrode assembly of the stack / folding type structure includes two or more unit cells having a structure in which an anode and a cathode face each other and in which two or more electrode plates are stacked, and the unit cells are wound in one non- Or by bending the separation film to a size of the unit cell and interposing it between the unit cells.

In some cases, the positive electrode and the negative electrode face each other, and one or more single electrode plates may be further included between any unit cells and / or an outer surface of the outermost unicell.

The unit cell may be an S-type unit cell in which the outermost electrode plates on both sides have the same electrode, and a D-type unit cell in which the outermost electrode plates on opposite sides have opposite electrodes.

The S type unit cell may be an SA type unit cell in which the outermost electrode plates on both sides are the anode, and an SA type unit cell in which the outermost electrode plates on both sides are the cathodes.

The electrode assembly of the lamination / stacked structure is obtained by coating each metal current collector with an electrode mixture, drying, pressing and cutting to a predetermined size, sequentially separating the negative electrode from the lower portion, And a separator is laminated thereon.

The battery case may be composed of a laminate sheet including a resin outer layer, a barrier metal layer, and a heat-fusible resin sealant layer.

Since the resin outer layer must have excellent resistance from the external environment, it is necessary to have a tensile strength and weather resistance higher than a predetermined level. In this respect, polyethylene terephthalate (PET) and stretched nylon film can be preferably used as the polymer resin of the outer resin layer.

The barrier metal layer may preferably be made of aluminum so as to exhibit a function of improving the strength of the battery case, in addition to a function of preventing foreign matter such as gas or moisture from leaking or leaking.

The resin sealant layer may preferably be a polyolefin resin having low heat absorbability (thermal adhesiveness), low hygroscopicity to suppress penetration of an electrolyte solution, and not being swollen or eroded by an electrolytic solution, Preferably, lead-free polypropylene (CPP) can be used.

In one embodiment of the present invention, the electrode assemblies may comprise two unit electrode assemblies. Specifically, the electrode assemblies may include a first electrode assembly and a second electrode assembly.

Since the first electrode assembly and the second electrode assembly are arranged adjacent to each other in the accommodating portion, contact between the electrodes due to external impact or vibration may occur and short-circuit may occur. Therefore, in order to prevent a short circuit due to contact between the electrodes of the electrode assemblies, a structure for mutually insulating the electrode assemblies may be formed.

In one embodiment for electrically isolating the electrode assemblies, the first electrode assembly and the second electrode assembly may each have a structure in which an outer surface is surrounded by a separator sheet.

In another embodiment, the first electrode assembly and the second electrode assembly may be enclosed by a separator sheet, and one end of the separator sheet may be connected to the first electrode assembly And may be electrically insulated from the interface of the second electrode assembly.

Specifically, the separator sheet may be wound around the outer surface of the first electrode assembly in a state where one end of the separator sheet is interposed at the interface between the first electrode assembly and the second electrode assembly, The second electrode assembly may be wound around the outer surface of the second electrode assembly.

As another embodiment for electrically insulating the electrode assemblies, an electrically insulating member may be interposed at an interface between the first electrode assembly and the second electrode assembly.

With such a structure, it is possible to exclude the additional separator structure that covers the outer surfaces of the first electrode assembly and the second electrode assembly, thereby making it possible to construct a battery cell having a compact structure.

Specifically, the electrically insulating member may be an electrically insulating sheet or film. Since the electrically insulating sheet or film has a relatively thin thickness, a battery cell having a compact structure can be constructed.

In addition, the electrically insulating member may be an electrically insulating double-sided adhesive tape. The electrically insulating double-sided adhesive tape is adhered to the first electrode assembly and the second electrode assembly to minimize a gap between the first electrode assembly and the second electrode assembly, thereby making it possible to construct a battery cell having a compact structure.

The electrically insulating member may be a thermoplastic or thermosetting polymer resin, and at least a part of the polymer resin is attached to at least one of an outer surface of the first electrode assembly, an outer surface of the second electrode assembly, and an inner surface of the battery case Structure. Therefore, even if the temperature of the battery cell rises and the electrical insulating member contracts or expands due to the increase in the temperature of the battery cell during charging and discharging of the battery cell, the thermoplastic or thermosetting polymer resin does not separate from the interface between the first electrode assembly and the second electrode assembly Electrical insulation can be maintained.

The material that can achieve electrical insulation between the first electrode assembly and the second electrode assembly, as well as the above-mentioned structures as an example of the electrically insulating member, is not limited thereto.

In one embodiment of the present invention, the distance between the first electrode assembly and the second electrode assembly may be less than 1 mm. When the distance between the first electrode assembly and the second electrode assembly is greater than 1 mm, the capacity of the electrode assembly that can be embedded in the battery cell is reduced by a distance between the electrode assemblies, .

In one embodiment of the present invention, the electrode terminals of the first electrode assembly and the electrode terminals of the second electrode assembly may be formed in a first direction. The battery cell may have a rectangular planar shape, and the first direction may be a direction from one side of the four sides of the rectangular structure from the center of the battery cell. Therefore, the structure in which the electrode terminals of the first electrode assembly and the electrode terminals of the second electrode assembly are formed in the first direction can prevent the electrode terminals of the first electrode assembly and the electrode terminals of the second electrode assembly, It may be a structure formed at one side of four sides of the cell.

The electrode terminals of the first electrode assembly may be formed in a first direction and the electrode terminals of the second electrode assembly may be formed in a second direction opposite to the first direction. Therefore, the electrode terminals of the first electrode assembly may be formed on one side of the four sides of the battery cell, and the electrode terminals of the second electrode assembly may be formed on the opposite sides of the side of the battery cell.

The electrode terminals of the first electrode assembly may be formed in a first direction and the electrode terminals of the second electrode assembly may be formed in a third direction orthogonal to the first direction. Accordingly, the electrode terminals of the first electrode assembly may be formed on one side of the four sides of the battery cell, and the electrode terminals of the second electrode assembly may be formed on the side adjacent to the one side.

The battery cell may be a lithium secondary battery, specifically, a lithium ion battery or a lithium ion polymer battery.

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 &lt; 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 battery pack including at least two battery cells.

The present invention also provides a device including the battery pack as a power source.

The device may be selected from a cell phone, a wearable electronic device, a portable computer, a smart pad, a netbook, a LEV (Light Electronic Vehicle), an electric vehicle, a hybrid 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, according to the battery cell of the present invention, since the plurality of electrode assemblies are incorporated in one housing portion formed in one battery case, the conventional technology is applicable to the case where the plurality of pouch- Unlike the case where the dead space is generated by the side sealing portions of the battery cell, the dead space can be minimized and the internal space of the electrode assembly can be additionally secured thereby increasing the energy density.

1 is an exploded view of a conventional pouch-shaped battery cell;
FIG. 2 is a plan view of a battery pack including the battery cells of FIG. 1; FIG.
3 is an enlarged view on a vertical section of a portion where the battery cells of FIG. 2 contact;
Figure 4 is a plan perspective view of a battery cell according to one embodiment of the present invention;
5 is a vertical sectional view of the battery cell of Fig. 4;
6 is a vertical sectional view of a battery cell according to another embodiment of the present invention;
7 is a vertical cross-sectional view of a battery cell according to another embodiment of the present invention;
8 is a vertical sectional view of a battery cell according to another embodiment of the present invention;
9 is a plan view of a battery cell according to another embodiment of the present invention;
10 is a plan view of a battery cell according to another embodiment of the present invention;
11 is a plan view of a battery cell according to 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.

4 is a schematic perspective view of a battery cell according to an embodiment of the present invention, and FIG. 5 is a schematic vertical cross-sectional view of the battery cell of FIG. 4

4 and 5, the battery cell 100 includes a first electrode assembly 110 and a second electrode assembly 120 having a separator structure sandwiched between a cathode, a cathode, and an anode and a cathode, And a battery case 130 in which the first electrode assembly 110 and the second electrode assembly 120 are embedded.

The battery case 130 is formed with one receiving part 131 in which the first electrode assembly 110 and the second electrode assembly 120 are embedded and the first electrode assembly 110 and the second electrode assembly 120 Are contained in the accommodating portion 131 in a planar arrangement.

The first electrode assembly 110 and the second electrode assembly 120 include independent electrode terminals 111 and 121 exposed to the outside of the battery case 130, respectively.

The electrode terminals 111 of the first electrode assembly 110 are formed in the first direction on the upper side of the four sides of the battery case 130 and the electrode terminals 121 of the second electrode assembly 120 are formed in the first direction, Is formed in the first direction on the upper side of the battery case 130 in the same manner as the electrode terminal 111 of the electrode assembly 110.

The first electrode assembly 110 is independently surrounded by the first separator sheet 112 and the second electrode assembly 120 is surrounded by the second separator sheet 122 independently. Accordingly, the first electrode assembly 110 and the second electrode assembly 120 are electrically insulated.

The distance L between the first electrode assembly 110 and the second electrode assembly 120 is 1 mm. When the distance L between the first electrode assembly 110 and the second electrode assembly 120 exceeds 1 mm, the distance L between the electrode assemblies 110, The capacity of the electrode assemblies 110 and 120 that can be embedded becomes small, so that the energy density of the battery cell 100 is reduced.

6 is a vertical cross-sectional view of a battery cell according to another embodiment of the present invention.

Referring to FIG. 6, the first electrode assembly 210 and the second electrode assembly 220 are surrounded by a third separator sheet 211 to provide electrical insulation.

Specifically, the third separator sheet 211 is first formed on the outer surface of the first electrode assembly 210 in a state where the one end portion 212 is disposed on the interface between the first electrode assembly 210 and the second electrode assembly 220, And is wound along the outer surface of the second electrode assembly 220 while completely covering the outer surface of the first electrode assembly 210.

The remaining structure except for the separator sheet structure is the same as that of the embodiment described with reference to FIG. 4 and FIG. 5, and a description thereof will be omitted.

FIG. 7 is a schematic vertical sectional view of a battery cell according to another embodiment of the present invention.

Referring to FIG. 7, an electrical insulating member 311 is interposed at the interface between the first electrode assembly 310 and the second electrode assembly 320. The first electrode assembly 310 and the second electrode assembly 320 may be separated from each other by a separate separator sheet when the first and the second electrode assemblies 310 and 320 are in contact with each other, The structure surrounding the outer surface can be excluded.

The electrically insulating member 311 is made of an electrically insulating film.

The remaining structure except for the electrically insulating member is the same as the structure of the embodiment described with reference to FIG. 4 and FIG. 5, so a detailed description thereof will be omitted.

8 is a vertical cross-sectional view of a battery cell according to another embodiment of the present invention.

Referring to FIG. 8, a double-sided tape 411 is interposed at an interface between the first electrode assembly 410 and the second electrode assembly 420. The electrically insulating double-sided adhesive tape 411 is adhered to the first electrode assembly 410 and the second electrode assembly 420 to minimize the gap between the first electrode assembly 410 and the second electrode assembly 420, Structure of the battery cell.

When the double-sided tape 411 is interposed at the interface between the first electrode assembly 410 and the second electrode assembly 420, the first electrode assembly 410 and the second electrode assembly 420 are separated from each other by a separate separation sheet, Can be excluded.

The remaining structure except for the double-sided tape structure is the same as the structure of the embodiment described with reference to FIGS. 4 and 5, so a detailed description thereof will be omitted.

9 is a schematic vertical cross-sectional view of a battery cell according to another embodiment of the present invention.

Referring to FIG. 9, a thermoplastic polymer resin 511 is interposed at the interface between the first electrode assembly 510 and the second electrode assembly 520.

The upper end of the polymer resin 511 is attached to the outer surface of the first electrode assembly 510 and the lower end of the polymer resin 511 is attached to the outer surface of the second electrode assembly 520. Accordingly, even if the temperature of the battery cell 500 rises due to the charging / discharging process of the battery cell 500 and the polymer resin 511 contracts or expands and is deformed, the first electrode assembly 510 and the second electrode Maintains electrical insulation without detaching from the interface of assembly 520. [

When the polymer resin 511 is interposed at the interface between the first electrode assembly 510 and the second electrode assembly 520, the first electrode assembly 510 and the second electrode assembly 520 are separated from each other by a separate separator sheet, Can be excluded.

The remaining structure except for the thermoplastic polymer resin is the same as the structure of the embodiment described with reference to FIG. 4 and FIG. 5, and thus a detailed description thereof will be omitted.

FIG. 10 schematically shows a plan view of a battery cell according to another embodiment of the present invention.

10, the electrode terminals 611 of the first electrode assembly 610 are formed in the first direction on the upper side of the four sides of the battery case 630 in the first direction, and the electrode terminals 611 of the second electrode assembly 620, The second electrode assembly 621 is formed on the lower side of the battery case 630 facing the electrode terminal 611 of the first electrode assembly 610 in the second direction.

The remaining structure of the electrode assemblies except for the electrode terminal formation direction is the same as the structure of the embodiment described with reference to FIG. 4 and FIG. 5, so a detailed description thereof will be omitted.

Fig. 11 schematically shows a plan view of a battery cell according to another embodiment of the present invention.

11, the electrode terminal 711 of the first electrode assembly 710 is formed in a first direction on the upper side of four sides of the battery case 730, and the electrode terminal 711 of the second electrode assembly 720 The first electrode assembly 710 is formed in the third direction on the right side of the battery case 730 orthogonal to the electrode terminal 711 of the first electrode assembly 710.

The remaining structure of the electrode assemblies except for the electrode terminal formation direction is the same as the structure of the embodiment described with reference to FIG. 4 and FIG. 5, so a detailed description thereof will be omitted.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims (19)

An electrode assembly having a separator structure sandwiched between an anode, a cathode, and an anode and a cathode, and a battery case having a housing part in which the electrode assemblies are embedded;
Wherein the electrode assemblies include at least two electrode assemblies in a planar array and the electrode assemblies each include independent electrode terminals exposed to the outside of the battery case. The battery cell according to claim 1, wherein the electrode assemblies are independently of one another a folding structure, a stacking structure, a stacking / folding structure, or a lamination / stacking structure. The battery cell according to claim 1, wherein the battery case comprises a laminate sheet including a resin outer layer, a barrier metal layer, and a heat-meltable resin sealant layer. The battery cell of claim 1, wherein the electrode assemblies comprise a first electrode assembly and a second electrode assembly. The battery cell according to claim 1, wherein the first electrode assembly and the second electrode assembly are independently surrounded by an outer surface of a separator sheet. The separator according to claim 1, wherein the first electrode assembly and the second electrode assembly are surrounded by a separator sheet, and one end of the separator sheet is interposed between the first electrode assembly and the second electrode assembly Wherein the battery cell is electrically insulated. The battery cell according to claim 1, wherein an electrical insulating member is interposed at an interface between the first electrode assembly and the second electrode assembly. The battery cell according to claim 7, wherein the electrically insulating member is an electrically insulating sheet or film. The battery cell according to claim 7, wherein the electrically insulating member is an electrically insulating double-sided adhesive tape. The battery cell according to claim 7, wherein the electrically insulating member is a thermoplastic or thermosetting polymer resin. The battery cell according to claim 10, wherein at least a part of the polymer resin is attached to at least one of an outer surface of the first electrode assembly, an outer surface of the second electrode assembly, and an inner surface of the battery case. The battery cell according to claim 1, wherein a distance between the first electrode assembly and the second electrode assembly is 1 mm or less. The battery cell according to claim 1, wherein the electrode terminals of the first electrode assembly and the electrode terminals of the second electrode assembly are formed in a first direction. The battery pack according to claim 1, wherein the electrode terminals of the first electrode assembly are formed in a first direction, and the electrode terminals of the second electrode assembly are formed in a second direction opposite to the first direction. Cell. The battery according to claim 1, wherein the electrode terminals of the first electrode assembly are formed in a first direction, and the electrode terminals of the second electrode assembly are formed in a third direction orthogonal to the first direction. Cell. The battery cell according to claim 1, wherein the battery cell is a lithium secondary battery. A battery pack comprising at least two battery cells according to claim 1. A device as claimed in claim 17 comprising a battery pack as a power source. 19. The device of claim 18, wherein the device is selected from a cell phone, a wearable electronic device, a portable computer, a smart pad, a netbook, a LEV (Light Electronic Vehicle), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, Lt; / RTI &gt;

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