KR102080502B1 - Pouch-typed Battery Cell Having Two or More Electrode Assemblies - Google Patents

Abstract

The present invention includes an electrode assembly having a positive electrode, a negative electrode and an electrode assembly having a separator structure interposed between the positive electrode and the negative electrode, and a battery case in which the electrode assembly is housed. The electrode assemblies provide a battery cell, characterized in that at least two or more electrode assemblies are embedded in the housing in a planar arrangement, and the electrode assemblies each include independent electrode terminals exposed to the outside of the battery case.

Description

Pouch-typed Battery Cell Having Two or More Electrode Assemblies}

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

As technology (Information Technology) technology has developed remarkably, various portable information and communication devices have been spreading, and the 21st century is developing into a ubiquitous society that can provide high quality information services regardless of time and place.

Lithium secondary batteries occupy an important position on the basis of development into such a ubiquitous society. Specifically, the rechargeable lithium battery is widely used as an energy source of wireless mobile devices, and is proposed as a solution for air pollution of conventional gasoline and diesel vehicles using fossil fuels. It is also used as an energy source for electric vehicles and hybrid electric vehicles.

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

The lithium secondary battery may be classified into a cylindrical battery cell, a square battery cell, a pouch-type battery cell, and the like according to its shape. Among them, a pouch-type battery cell that can be stacked with high integration, has a high energy density per weight, and is easy to deform, has attracted much attention.

The pouch-type battery cell may be configured as a battery module or a battery pack by electrically connecting a plurality of pouch-type battery cells to be mounted in a device requiring high output and high capacity.

1 schematically illustrates a general structure of a typical pouch-type battery cell including a stacked electrode assembly.

Referring to FIG. 1, the battery cell 10 includes an electrode assembly 30 formed of a positive electrode, a negative electrode, and a separator disposed therebetween inside a pouch-type battery case 20, and a positive electrode and a negative electrode thereof. The tabs 31 and 32 are welded to the two electrode leads 40 and 41, respectively, and are sealed (sealed) 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 and a concave shape receiving portion 23 on which the electrode assembly 30 can be seated. One side is made of a cover 22 is connected.

In order to configure the outer circumferential surface of the battery cell 20 in a compact structure, both side edges of the battery case 20 are bent vertically in the direction of the storage part 23 in close contact with the battery case 20 in a sealed state.

FIG. 2 schematically shows a general structure of a battery pack including the pouch-type battery cells of FIG. 1, and FIG. 3 is an enlarged view in a vertical section of a portion A in which the battery cells of FIG. 1 are in contact. Is shown.

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

Referring to FIG. 3 together with FIG. 2, since the side sealing portions 12 of the battery cells 10 form a dead space 60 in which the electrode assembly 30 is not embedded, the battery cells 10 are formed. Under the structure of arranging the battery pack 50 by arranging them in contact with the sides, there is a problem in that the capacity of the battery is reduced by the space occupied by the side sealing parts 12, thereby decreasing the energy density.

The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

It is an object of the present invention to provide a battery cell capable of increasing energy density by minimizing dead space and additionally securing an internal space of an electrode assembly when constructing a high capacity / high output battery using a pouch-type battery cell.

Battery cell according to the present invention for achieving this object,

It may include a positive electrode, a negative electrode and the electrode assembly of the membrane structure interposed between the positive electrode and the negative electrode, and a battery case is formed with a housing portion in which the electrode assembly is built;

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

Therefore, the battery cell according to the present invention, the plurality of electrode assemblies are embedded in one housing formed in one battery case, the conventional technology is a side of the battery cell when the battery pack is configured by connecting a plurality of pouch-type battery cells Unlike the dead space generated by the sealing parts, the dead space can be minimized, and thus the energy density can be increased by additionally securing the internal space of the electrode assembly.

The electrode assemblies may be formed independently of each other in a folding structure, or a stacked structure, or a stack / folding structure, or a lamination / stack structure.

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

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

The electrode assembly of the stacked structure is a separator formed by coating an electrode mixture on each metal current collector, followed by drying and pressing to cut a predetermined size corresponding to the positive and negative plates between the positive and negative plates cut to a predetermined size. It can manufacture by laminating | stacking after interposing.

The electrode assembly of the stack / foldable structure is a structure in which an anode and a cathode face each other, and includes two or more unit cells in which two or more electrode plates are stacked, and the unit cells are wound with one or more separation films in a non-overlapping form, Alternatively, the separation film may be manufactured to be interposed between the unit cells by bending the separation film to the size of the unit cell.

In some cases, the anode and the cathode face each other, and one or more single electrode plates may be further included between arbitrary unit cells and / or on the outer surface of the outermost uncell.

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

The S-type unit cell may be an SC-type unit cell in which both outermost pole plates are positive electrodes, and an SA-type unit cell in which both outermost pole plates are negative electrodes.

The electrode assembly of the lamination / stack type structure may be coated with an electrode mixture on each metal current collector, dried, pressed and cut to a predetermined size, and then the cathode, the separator on the upper part of the cathode, and the anode, sequentially from the bottom, and It can be prepared by laminating a separator on top.

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

Since the resin outer layer should have excellent resistance from the external environment, it is necessary to have a predetermined tensile strength and weather resistance. In such aspect, polyethylene terephthalate (PET) and a stretched nylon film may be preferably used as the polymer resin of the outer resin layer.

The barrier metal layer is preferably aluminum may be used to exert a function of improving the strength of the battery case in addition to the function of preventing the inflow or leakage of foreign substances such as gas, moisture.

The resin sealant layer has a heat sealability (heat adhesion), low hygroscopicity to suppress the penetration of the electrolyte solution, polyolefin resin that is not expanded or eroded by the electrolyte solution may be preferably used. Preferably unstretched polypropylene (CPP) can be used.

In one embodiment of the present invention, the electrode assemblies may be composed of two unit electrode assemblies. Specifically, the electrode assemblies may be composed of 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 part, a short circuit may occur due to contact between the electrodes by external shock or vibration. Therefore, in order to prevent a short circuit due to contact between the electrodes of the electrode assemblies, a structure in which the electrode assemblies are insulated from each other may be formed.

As an embodiment for electrically insulating the electrode assemblies, the first electrode assembly and the second electrode assembly may each have a structure in which an outer surface thereof is independently surrounded by a separator sheet.

As another embodiment for electrically insulating the electrode assemblies, the first electrode assembly and the second electrode assembly may be surrounded by an outer surface of one separator sheet, and one end of the separator sheet may have a first electrode assembly. And may be interposed at an interface between the second electrode assembly and electrical insulation.

Specifically, the separator sheet may be wound along an outer surface of the first electrode assembly in a state where one end portion is interposed at an interface between the first electrode assembly and the second electrode assembly, and completely surrounds the outer surface of the first electrode assembly. It may be made of a structure that is wound along the outer surface of the second electrode assembly in a state.

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

Under such a structure, since an additional separator structure in which the outer surface of the first electrode assembly and the second electrode assembly is wrapped may be excluded, a battery cell having a compact structure may be configured.

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, it is possible to construct a battery cell having a compact structure.

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

In addition, the electrically insulating member may be a thermoplastic or thermosetting polymer resin, wherein at least a portion 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. It can consist of a structure. Therefore, even when the temperature inside the battery cell rises during charge and discharge of the battery cell, and the electrical insulating member contracts or expands, the thermoplastic or thermosetting polymer resin does not depart from the interface between the first electrode assembly and the second electrode assembly. Electrical insulation can be maintained.

As an example of the electrically insulating member, any material capable of achieving electrical insulation between the first electrode assembly and the second electrode assembly as well as the above-mentioned components 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 1 mm or less. When the separation distance between the first electrode assembly and the second electrode assembly exceeds 1 mm, the capacity of the electrode assembly that can be embedded in the battery cell is reduced by the separation distance between the electrode assemblies, so that the energy density of the battery cell may be reduced. Can be.

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 planar rectangular structure, and the first direction may mean a direction from one side of four sides of the rectangular structure to the center of the battery cell. Accordingly, in 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, the electrode terminals of the first electrode assembly and the electrode terminals of the second electrode assembly may be formed of the battery. It may be a structure formed on one side of the 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. Accordingly, the electrode terminals of the first electrode assembly may be formed on one side of four sides of the battery cell, and the electrode terminals of the second electrode assembly may be formed on the other side opposite to the one side.

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 four sides of the battery cell, and the electrode terminals of the second electrode assembly may be formed on the side surface adjacent to the one side.

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

In general, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a lithium salt-containing nonaqueous electrolyte.

The positive electrode is prepared by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector, followed by drying, and optionally, a filler is further added to the mixture.

The positive electrode 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 , Cu ₂ V ₂ O ₇ and the like; Ni-site-type lithium nickel oxide represented by the formula LiNi _1-x M _x O ₂ , wherein 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 , wherein M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1, or Li ₂ Mn ₃ MO ₈ , where M = Fe, Co, Lithium manganese composite oxide represented by Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with alkaline earth metal ions; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ and the like, but are not limited to these.

The conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. The conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery. Examples of the conductive material include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys 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 that assists in bonding the active material and the conductive material to the current collector, and is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, 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 inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery. Examples of the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.

The negative electrode is manufactured by coating and drying a negative electrode active material on a negative electrode current collector, and optionally, the components as described above may be further included if necessary.

As said negative electrode active material, For example, carbon, such as hardly graphitized carbon and graphite type 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 ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; 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 metal oxides such as Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separator 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 from 0.01 to 10 ㎛ ㎛, thickness is generally 5 ~ 300 ㎛. As such a separator, for example, olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets made of glass fibers or polyethylene, nonwoven fabrics, and the like are used. When a solid electrolyte such as a polymer is used as the electrolyte, the solid electrolyte may also serve as a separator.

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

As said non-aqueous liquid electrolyte, For example, N-methyl- 2-pyrrolidinone, a propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethylsulfoxide, 1,3-dioxolon, formamide, dimethylformamide, dioxorone , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be used.

Examples of the organic solid electrolyte include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymers containing ionic dissociating groups and the like can be used.

Examples of the inorganic solid electrolytes 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, sulfates and the like of Li, such as Li ₄ SiO ₄ -LiI-LiOH, Li ₃ PO ₄ -Li ₂ S-SiS ₂ , and the like, may be used.

The lithium salt is a good material to be dissolved 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.

In addition, for the purpose of improving charge / discharge characteristics, flame retardancy, etc., the non-aqueous electrolyte solution includes, for example, pyridine, triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, and hexaphosphate triamide. Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride, etc. It may be. In some cases, in order to impart nonflammability, halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics.

The present invention also provides a battery pack including two or more of the battery cells.

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

The device may be selected from mobile phones, wearable electronics, portable computers, smart pads, netbooks, light electronic vehicles (LEVs), electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and power storage devices.

Since the structure of these devices and their fabrication methods are known in the art, detailed descriptions thereof are omitted herein.

As described above, the battery cell according to the present invention, when a plurality of electrode assemblies are built in one housing formed in one battery case, the prior art when connecting a plurality of pouch-type battery cells when constructing a battery pack Unlike the dead space generated by the side sealing parts of the battery cell, the dead space can be minimized, thereby increasing the energy density by additionally securing the internal space of the electrode assembly.

1 is an exploded view of a conventional pouch-type 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 in vertical section of a portion where the battery cells of FIG. 2 contact;
4 is a top perspective view of a battery cell according to one embodiment of the present invention;
5 is a vertical cross-sectional view of the battery cell of FIG. 4;
6 is a vertical cross-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 cross-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, although described with reference to the drawings according to an embodiment of the present invention, this is for easier understanding of the present invention, the scope of the present invention is not limited thereto.

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

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

The battery case 130 has one receiving unit 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 formed. ) Is built in the housing 131 in a planar arrangement.

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

The electrode terminal 111 of the first electrode assembly 110 is formed on the upper side of the four sides of the battery case 130 in the first direction, and the electrode terminal 121 of the second electrode assembly 120 is the first side. Like the electrode terminal 111 of the electrode assembly 110 is formed in the first direction on the upper side of the battery case 130.

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

The separation distance L between the first electrode assembly 110 and the second electrode assembly 120 has a size of 1 mm. When the separation distance L of the first electrode assembly 110 and the second electrode assembly 120 exceeds 1 mm, the separation distance L between the electrode assemblies 110 and 120 may be applied to the battery cell 100. Since the capacity of the electrode assemblies 110 and 120 that can be embedded is reduced, 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, an outer surface of the first electrode assembly 210 and the second electrode assembly 220 is surrounded by one third separator sheet 211 to provide electrical insulation.

In detail, the third separator sheet 211 has the one end 212 interposed at the interface between the first electrode assembly 210 and the second electrode assembly 220. First, the outer surface of the first electrode assembly 210 is formed. It is wound along, and has a structure that is wound along the outer surface of the second electrode assembly 220 in a state completely surrounding the outer surface of the first electrode assembly 210.

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

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

Referring to FIG. 7, an electrically insulating member 311 is interposed at an interface between the first electrode assembly 310 and the second electrode assembly 320. When the electrically 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 by a separate separator sheet. The structure surrounding the outer surface can be excluded.

The electrically insulating member 311 consists of an electrically insulating film.

Since the rest of the structure except for the electrically insulating member is the same as that of the embodiment described with reference to FIGS. 4 and 5, 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 between 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, thereby providing a compact structure. A battery cell having a structure is constituted.

When the double-sided tape 411 is interposed at the interface between the first electrode assembly 410 and the second electrode assembly 420, the outer surfaces of the first electrode assembly 410 and the second electrode assembly 420 are separated by a separate separator sheet. The structure enclosing can be excluded.

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

9 is a 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 an interface between the first electrode assembly 510 and the second electrode assembly 520.

The polymer resin 511 has an upper end attached to an outer surface of the first electrode assembly 510, and a lower end attached to an outer surface of the second electrode assembly 520. Accordingly, even when the temperature in the battery cell 500 rises during charge and discharge of the battery cell 500 and the polymer resin 511 contracts or expands and deforms, the first electrode assembly 510 and the second electrode are made of thermoplastic. The electrical insulation is maintained without departing from the interface of the assembly 520.

When the polymer resin 511 is interposed between the first electrode assembly 510 and the second electrode assembly 520, the outer surfaces of the first electrode assembly 510 and the second electrode assembly 520 are separated by a separate membrane sheet. The structure enclosing can be excluded.

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

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

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

The rest of the structure of the electrode assemblies except for the electrode terminal forming direction is the same as that of the embodiment described with reference to FIGS. 4 and 5, and thus a detailed description thereof will be omitted.

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

Referring to FIG. 11, an electrode terminal 711 of the first electrode assembly 710 is formed in a first direction on an upper side of four sides of the battery case 730 and an electrode terminal of the second electrode assembly 720. 721 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 rest of the structure of the electrode assemblies except for the electrode terminal forming direction is the same as that of the embodiment described with reference to FIGS. 4 and 5, and thus a detailed description thereof will be omitted.

Although described above with reference to the drawings according to an embodiment of the present invention, those of ordinary skill in the art will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

Claims (19)

A laminate sheet including an anode, a cathode, and an electrode assembly having a separator structure interposed between the anode and the cathode, and a resin outer layer, a barrier metal layer, and a heat-melt resin sealant layer having an accommodating portion in which the electrode assemblies are embedded . A battery case;
The electrode assemblies may have a folding structure, or a stacking structure, or a stacking / folding structure, or a lamination / stack type structure independently of each other.
The electrode assemblies may include at least two electrode assemblies, each having a plurality of independent electrode terminals exposed to an exterior of the battery case, in which the at least two electrode assemblies are housed in the receiving unit, and each of the electrode terminals of the electrode assemblies may be provided. In the battery cell characterized in that all are exposed to face in different directions,
An electrically insulating double-sided adhesive tape made of a thermosetting polymer resin is interposed at an interface between the electrode assemblies,
At least a portion of the double-sided adhesive tape is attached to at least one of the outer surface of the part or all of the electrode assembly and the inner surface of the battery case, so that the separation distance between the electrode assembly is less than 1 mm Cell. delete delete The battery cell of claim 1, wherein the electrode assemblies comprise a first electrode assembly and a second electrode assembly. The battery cell of claim 1, wherein the electrode assemblies are each independently surrounded by a separator sheet. The battery cell according to claim 1, wherein the electrode assemblies are surrounded by an outer surface of one separator sheet, and one end of the separator sheet is interposed between the electrode assemblies to form electrical insulation. . delete delete delete delete delete delete delete The method of claim 1, wherein some of the electrode terminals of the electrode assemblies are formed in a first direction, and another part of the electrode terminals of the electrode assemblies is formed in a second direction opposite to the first direction. Battery cell. The method of claim 1, wherein some of the electrode terminals of the electrode assemblies are formed in a first direction, and another part of the electrode terminals of the electrode assemblies is formed in a third direction orthogonal to the first direction. Battery cell. The battery cell of claim 1, wherein the battery cell is a lithium secondary battery. A battery pack comprising two or more battery cells according to claim 1. A device comprising the battery pack according to claim 17 as a power source. 19. The device of claim 18, wherein the device is selected from mobile phones, wearable electronics, portable computers, smart pads, netbooks, light electronic vehicles (LEVs), electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and power storage devices. Device characterized in that the.

Images