Low-resistance cable-type battery cell without electrode tab

Abstract

When a cable-type battery cell having electrode tabs formed at both ends thereof is manufactured, due to the linear structural characteristics of the cable-type battery cell, as the length of the battery cell increases, the travel distance of electrons from an electrode to the electrode tabs increases, resulting in a problem of low electron transfer rate due to an increase in the resistance of the battery cell. In order to solve the problem, the present invention relates to a low-resistance cable-type battery cell without an electrode tab, that is, the cable-type battery cell is configured so that the built-in member constituting the outermost side of the cable-type battery cell is configured as a conductive layer to be used as an electrode tab without separately forming an electrode tab of an external electrode. The characteristics of low resistance are achieved by providing the electrons with the shortest distance path from the active material layer of the electrode to the electrode tab.

Description

Technical Field

[0001] This application claims the benefit of priority from Korean Patent Application No. 2023-0095051, filed on Jul. 21, 2023, the contents of which are hereby incorporated by reference in their entirety.

[0002] The present invention relates to a low-resistance cable-type battery cell without electrode tabs. Specifically, due to the linear structure of a cable-type battery cell with electrode tabs formed at both ends, as the length of the battery cell increases, the distance electrons must travel from the electrodes to the electrode tabs increases, leading to low electron mobility due to increased battery cell resistance. To address this issue, the present invention relates to a low-resistance cable-type battery cell without electrode tabs. The cable-type battery cell is constructed so that the outermost internal component of the cable-type battery cell is configured as a conductive layer, thereby enabling the internal component to function as an electrode tab, eliminating the need for separately forming electrode tabs for the external electrodes. Background Art

[0003] As the safety and capacity of lithium secondary batteries capable of charge and discharge have rapidly improved, the number of types of devices using lithium secondary batteries as energy sources has increased.

[0004] For example, lithium secondary batteries have been widely used as energy sources for wireless mobile devices or wearable devices that are small multifunctional products, and are also used as energy sources for electric vehicles and hybrid electric vehicles as alternatives to existing gasoline vehicles and diesel vehicles that cause air pollution, or as medium- or large-sized battery packs configured for use in energy storage systems (ESS).

[0005] Depending on the shape of the battery case, lithium secondary batteries are classified into cylindrical battery cells having an electrode assembly mounted in a cylindrical metal can, prismatic battery cells having an electrode assembly mounted in a prismatic metal can, or pouch-type battery cells having an electrode assembly mounted in a pouch-type case made of an aluminum laminate sheet. Pouch-type battery cells have the advantages of relatively large capacity and easy structural change.

[0006] Various wearable computer technologies and applications using these secondary batteries as power sources are being developed and released, and electronic devices such as mobile phones and notebook computers are being designed to have predetermined curved surfaces that are ergonomically designed. Therefore, secondary batteries used to operate these electronic devices also need to be formed into various shapes such as predetermined curved surfaces according to the shape of the electronic devices.

[0007] To match capacity and voltage to meet the specifications of these types of devices, multiple pouch-type battery cells can be connected in parallel or in series to form a battery pack. However, there is a problem in that the thickness and volume of each pouch-type battery cell increase accordingly, which reduces the flexibility of the battery cell and directly applies mechanical stress to the battery cell components in the event of mechanical deformation, resulting in performance degradation due to damage to the pouch-type battery cell.

[0008] In this regard, the concept of a linear battery cell has been proposed. A linear battery cell is a battery cell having a very large ratio of length to cross-sectional diameter.

[0009] Figure 1 This is a cross-sectional view of a conventional cable-type battery cell.

[0010] Reference Figure 1 The cable-type battery cell may include an internal electrode support 100 and an internal electrode 200 including a first internal current collector 210 and a first internal active material layer 220 sequentially wound on the internal electrode support 100 .

[0011] An outer isolation layer 300 may be formed outside the inner electrode 200 .

[0012] An external electrode 400 including an external active material layer 420 and an external current collector 410 may be formed outside the external separation layer 300 .

[0013] A built-in member 600 including a first built-in member layer 610 , a second built-in member layer 620 , a third built-in member layer 630 , and a fourth built-in member layer 640 may be formed outside the external electrode 400 .

[0014] The first built-in member layer 610 may be an adhesive layer for adhesion between the outer current collector 410 and the built-in member 600 .

[0015] The second built-in member layer 620 may be a metal layer for blocking moisture and / or oxygen.

[0016] The third built-up member layer 630 and / or the fourth built-up member layer 640 may be an insulating layer for insulation.

[0017] The adhesive layer can be made of any one selected from the group consisting of polypropylene, polycarbonate, polyethylene, styrene-butadiene rubber, sodium carboxymethyl cellulose, polyvinylidene fluoride, polyvinylidene fluoride copolymer, polytetrafluoroethylene, polystyrene, polyacrylonitrile, polyimide, polyacrylic acid, sodium polyacrylate, polyvinyl alcohol, sodium alginate, polymethacrylic acid and carboxymethyl chitosan, or two or more thereof.

[0018] In the present invention, a built-in component is provided, wherein the built-in component is an insulator formed on the outer surface of the external current collector to protect the electrode from moisture in the air and external impact. A conventional polymer resin including a moisture barrier layer can be used as the built-in component. In this case, aluminum or liquid crystal polymer having excellent moisture barrier properties can be used as the moisture barrier layer.

[0019] The polymer resin may include any one selected from the group consisting of polyethylene terephthalate (PET), polyvinyl chloride (PVC), high density polyethylene (HDPE), and epoxy resin, or two or more thereof.

[0020] Figure 2 is a perspective view of a conventional bidirectional electrode tab of a cable-type battery cell.

[0021] Reference Figure 2 , electrode tabs may be formed at both ends of a conventional cable-type battery cell so as to be connected to external terminals.

[0022] from Figure 2 The electrode tab protruding from the lower end may be an internal electrode tab 230 of the internal electrode.

[0023] from Figure 2 The electrode tab protruding from the upper end may be an external electrode tab 430 of the external electrode.

[0024] The inner electrode tab 230 may extend from the inner current collector. The outer electrode tab 430 may extend from the outer current collector. Thus, a unidirectional cable-type battery cell may be formed in which the inner electrode tab and the outer electrode tab protrude from one end of the cable-type battery cell.

[0025] A bidirectional cable-type battery cell in which the internal electrode tabs 230 and / or the external electrode tabs 430 are formed at both ends of the cable-type battery cell may be formed.

[0026] A bidirectional cable-type battery cell in which the internal electrode tabs 230 and / or the external electrode tabs 430 are formed at both ends of the cable-type battery cell may be formed.

[0027] The built-in member is configured in the form of a sheet including an aluminum laminate layer, and has a structure wrapping the entirety of the inner electrode 200 , the outer separation layer 300 , and the outer electrode 400 sequentially wound on the inner electrode supporter.

[0028] Therefore, electrode tabs of the inner electrode 200 and the outer electrode 400 are formed in the form of strips, respectively welded to current collectors of the inner electrode 200 and the outer electrode 400 so as to protrude from both ends of the cable-type battery cell.

[0029] Due to the linear structural characteristics of cable-type battery cells, electrode tabs can only be formed at both ends of the battery cell, and as the length of the battery cell increases, the distance electrons travel from the electrode to the electrode tabs increases, resulting in the problem of deterioration of rate characteristics related to electron mobility due to increased battery cell resistance.

[0030] Furthermore, in the case of the unidirectional cable-type battery cell, since the inner electrode tab and the outer electrode tab are formed adjacent to each other, there is a problem of a short circuit caused by contact between the two electrode tabs.

[0031] Therefore, using a tabless structure in which a conductive material serving as a positive electrode tab is applied to the outermost package of a cable-type battery cell provides the shortest distance path for electrons to pass from the active material layer of the electrode to the electrode tab, and the resistance of the cable-type battery cell is minimized regardless of the length of the linear battery cell, thereby balancing the length of the battery cell and the degradation of electron transport characteristics.

[0032] Korean registered patent publication No. 2259381 discloses a flexible secondary battery, which includes an electrode support, a sheet-type internal electrode spirally wound on the outside of the electrode support, a sheet-type first solid electrolyte layer spirally wound on the outside of the internal electrode, a sheet-type bipolar electrode spirally wound on the outside of the first solid electrolyte layer, a sheet-type second solid electrolyte layer spirally wound on the outside of the bipolar electrode, and a sheet-type external electrode spirally wound on the outside of the second solid electrolyte layer, wherein the first solid electrolyte layer and the second solid electrolyte layer each include an organic solid electrolyte, the internal electrode and the external electrode have insulating coatings arranged at both ends in the length direction of the side surfaces facing the first solid electrolyte layer and the second solid electrolyte layer, and the bipolar electrode has insulating coatings arranged at both ends in the length direction of both side surfaces.

[0033] However, a cable-type battery cell technology in which a built-in member exposes an external electrode so as to use the outermost side of the cable-type battery cell of the present invention as an electrode tab of the external electrode has not been applied.

[0034] Korean Registered Patent Publication No. 2128094 discloses a cable-type secondary battery including a cable-type electrode assembly and a sheet-type package spirally wound to surround an outer surface of the cable-type electrode assembly, the cable-type electrode assembly including: an inner electrode; a separator formed to surround an outer surface of the inner electrode, the separator configured to prevent a short circuit between the electrodes; and an outer electrode formed to surround the separator.

[0035] However, there is no disclosure of the cable-type battery cell technology having a built-in component with exposed external electrodes of the present invention.

[0036] Japanese Patent Application Publication No. 2016-066520 discloses a power storage device having a structure in which a power storage sheet including a positive electrode / separator / negative electrode is spirally wound on a wire structure, wherein a gap is formed between the wound portions of the power storage sheet, and wherein an exposed portion is formed on the positive electrode sheet and / or the negative electrode sheet of the power storage sheet and the exposed portion is exposed to the outside of the power storage sheet to serve as a terminal.

[0037] However, there is no disclosure of the cable-type battery cell technology having a built-in component with exposed external electrodes of the present invention.

[0038] Japanese Patent Application Publication No. 2021-026957 discloses a negative electrode having a fiber bundle of carbon fibers and a metal wire inserted into the fiber bundle along a length direction of the fiber bundle, and a needle-type secondary battery including the negative electrode.

[0039] However, a cable-type battery cell technology having built-in members wound while being partially spaced apart from each other so as to use the outermost side of the cable-type battery cell of the present invention as an electrode tab of an external electrode has not been applied.

[0040] Therefore, when manufacturing a cable-type battery cell having electrode tabs formed at both ends thereof, due to the linear structural characteristics of the cable-type battery cell, as the length of the battery cell increases, the distance that electrons travel from the electrodes to the electrode tabs increases, resulting in a problem of low electron mobility due to increased battery cell resistance. Therefore, to solve the above problem, it is necessary to develop a low-resistance cable-type battery cell without electrode tabs. That is, the cable-type battery cell is constructed so that by removing non-conductive material from the outermost internal component constituting the cable-type battery cell and forming a conductive layer on the outermost side of the cable-type battery cell, the internal component serves as the electrode tab, without the need to separately form an electrode tab for the external electrode. Summary of the Invention

[0041] Technical issues

[0042] The present invention is made in light of the above-mentioned problems. When manufacturing a cable-type battery cell having electrode tabs formed at both ends, due to the linear structural characteristics of the cable-type battery cell, as the length of the battery cell increases, the distance electrons must travel from the electrodes to the electrode tabs increases, resulting in low electron mobility due to increased battery cell resistance. Therefore, to address the above-mentioned problems, an object of the present invention is to provide a low-resistance cable-type battery cell without electrode tabs. Specifically, the cable-type battery cell is constructed so that by removing non-conductive material from the outermost internal component constituting the cable-type battery cell and forming a conductive layer on the outermost side of the cable-type battery cell, the internal component functions as an electrode tab, eliminating the need for separately forming electrode tabs for external electrodes.

[0043] Furthermore, another object of the present invention is to provide a cable-type tabless structure in which a pouch-type built-in member as the outermost package of a cable-type battery cell is conductive and thus serves as an electrode tab of an external electrode, thereby providing a shortest distance path for electrons to move from an active material layer of an electrode to the electrode tab.

[0044] Furthermore, in order to solve the problem that electron transfer characteristics of conventional cable-type battery cells deteriorate as the length of the battery cells increases, another object of the present invention is to provide a cable-type battery cell including a cable-type tabless structure in which the length of the battery cells can be increased without restriction.

[0045] Technical Solution

[0046] In order to achieve the above-mentioned object, a low-resistance cable-type battery cell without electrode tabs according to the present invention includes: the cable-type electrode assembly includes an internal electrode support, and one or more internal electrodes, an external isolation layer and an external electrode spirally wound on the internal electrode support in sequence; and an internal component, the internal component being configured to accommodate the cable-type electrode assembly, wherein the internal component is made of a conductive material.

[0047] The built-in member may be formed as a single layer or two or more laminated conductive layers.

[0048] The built-in member may be in contact with the external electrode.

[0049] The built-in member may serve as an electrode tab for the external electrode.

[0050] The internal electrode may include a first internal electrode including a first internal current collector and a first internal active material layer formed on one surface of the first internal current collector, and the first internal electrode, the external separation layer, and the external electrode may constitute a single cell.

[0051] The external electrode may include an external current collector and an external active material layer formed on one surface of the external current collector, and the first internal electrode, the external separation layer, and the external electrode may constitute a single cell.

[0052] The internal electrode may include an internal isolation layer spirally wound around the outside of the first internal electrode and a second internal electrode spirally wound around the outside of the internal isolation layer, and the first internal electrode, the internal isolation layer, the second internal electrode, the external isolation layer and the external electrode may constitute a bibattery.

[0053] The second internal electrode may include the second internal current collector; and a 2-1 internal active material layer and a 2-2 internal active material layer respectively formed on both surfaces of the second internal current collector.

[0054] The first internal electrode and the external electrode may be the same electrode, and the second internal electrode may be a different electrode from the first internal electrode and the external electrode.

[0055] If the first internal electrode and the external electrode are positive electrodes, the second internal electrode may be a negative electrode; if the first internal electrode and the external electrode are negative electrodes, the second internal electrode may be a positive electrode.

[0056] Each of the inner and outer separators may be an electrolyte layer or a separator.

[0057] The built-in component may be wrapped around both end surfaces of the cable-type battery cell.

[0058] If the cable-type battery cell is a single battery, the built-in member may be added to wrap around a portion of the outer separation layer and the outer electrodes exposed from both ends of the cable-type electrode assembly.

[0059] If the cable-type battery cell is a single battery, a non-conductive inner electrode sealant layer may be formed from a portion of the outer separation layer where the built-in member is not formed to the first inner active material layer.

[0060] At least one of both ends of the cable-type electrode assembly may have an inner electrode tab formed in a portion of the first inner current collector where the built-in member and the sealant layer are not formed.

[0061] An internal electrode tab sealant layer may be formed at a connection between the internal electrode tab and the first internal current collector.

[0062] If the cable-type battery is a bicell, the built-in member may be added to wrap around the external electrodes exposed from both ends of the cable-type electrode assembly, the internal electrodes, a portion of the external separator, and a portion of the internal separator.

[0063] If the cable-type battery cell is a bicellular battery, a non-conductive internal electrode sealant layer may be formed from a portion of the external isolation layer to which the built-in component is not added to the 2-1 internal active material layer; and a non-conductive internal electrode sealant layer may be formed from a portion of the internal isolation layer to which the built-in component is not added to the 2-2 internal active material layer.

[0064] At least one of both ends of the cable-type electrode assembly, an internal electrode tab may extend to a portion of the second internal current collector where the built-in member and the internal electrode sealant layer are not formed.

[0065] The inner electrode sealant layer may include any one selected from the group consisting of propylene, polypropylene-acrylic acid copolymer, polyethylene-acrylic acid copolymer, polyvinyl chloride, polypropylene-butylene-ethylene terpolymer, polyethylene, polyethylene and ethylene-propylene copolymer, or two or more thereof.

[0066] The cross-sectional shape of the cable-type battery cell may be any one of a circular shape, an elliptical shape, a triangular shape, a quadrilateral shape, a square shape, a rectangular shape, a polygonal shape, and an irregular shape.

[0067] The built-in member may be packaged to accommodate the cable-type electrode assembly.

[0068] The cable-type battery cell includes a sheathing member formed on an outer surface of the built-in member, the sheathing member being configured to expose only a portion of the built-in member.

[0069] The sheathing member may be wrapped around the built-in members formed at both ends of the cable-type battery cell.

[0070] The sheathing member may be wrapped around both ends of the cable-type battery cell except for the internal electrode tabs.

[0071] To achieve the above objectives, a low-resistance cable-type battery cell without electrode tabs according to the present invention includes: a cable-type electrode assembly, the cable-type electrode assembly including two or more internal electrodes, and an external isolation layer and an external electrode formed around the outer surfaces of the two or more internal electrodes and spirally wound in sequence; and a built-in component, the built-in component being configured to accommodate the cable-type electrode assembly, wherein the built-in component is conductive.

[0072] The internal electrodes may be configured such that two or more linear internal electrodes are disposed in parallel in contact with each other, or two or more linear internal electrodes are disposed in a twisted state.

[0073] Furthermore, the present invention can provide various combinations of the above-mentioned solutions.

[0074] Beneficial effects

[0075] As apparent from the above description, in the low-resistance cable-type battery cell without electrode tabs according to the present invention, electrons are provided with the shortest distance path from the active material layer of the electrode to the electrode tab, thereby enabling low-resistance characteristics.

[0076] In addition, regardless of the length of the cable-type battery cell, the resistance of the battery cell is minimized, thereby minimizing the deterioration of electron transfer characteristics even if the length of the battery cell increases.

[0077] In addition, in response to various length changes required by the shapes of electronic devices, the length of the cable-type battery cell can be increased without limiting the performance of the cable-type battery cell, enabling customization of the battery cell to fit the shapes of various electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 This is a cross-sectional view of a conventional cable-type battery cell.

[0079] Figure 2 is a perspective view of a conventional bidirectional electrode tab of a cable-type battery cell.

[0080] Figure 3 is a schematic diagram of a cable-type battery cell having a built-in member that is a conductive metal sheet according to an embodiment of the present invention.

[0081] Figure 4 is a schematic diagram of a cable-type battery cell having an internal member, which is a conductive metal sheet, serving as an electrode tab for an external electrode according to an embodiment of the present invention.

[0082] Figure 5 is an end cross-sectional view of a cable-type battery cell having an internal member that is a conductive metal sheet according to an embodiment of the present invention.

[0083] Figure 6 is an end perspective view of a cable-type battery cell having a built-in member that is a conductive metal sheet according to an embodiment of the present invention.

[0084] Figure 7FIG. 1 is a BB cross-sectional view of a cable-type battery cell having an internal component according to this embodiment of the present invention, the internal component being a conductive metal sheet.

[0085] Figure 8 1 is a CC cross-sectional view of a cable-type bi-cell having a built-in member according to this embodiment of the present invention, the built-in member being a conductive metal sheet.

[0086] Figure 9 is a schematic diagram of a cable-type battery cell including a plurality of internal electrodes according to an embodiment of the present invention, the cable-type battery cell having a built-in member serving as an external electrode tab, the built-in member being a conductive metal sheet.

[0087] Figure 10 is a graph showing resistance between an external electrode and an external electrode tab based on length in a conventional cable-type battery cell and a cable-type battery cell having a metal layer as a built-in member according to the present invention. DETAILED DESCRIPTION

[0088] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the preferred embodiments of the present invention. However, when describing the working principle of the preferred embodiments of the present invention in detail, when a detailed description of known functions and configurations incorporated herein may obscure the subject matter of the present invention, the detailed description will be omitted.

[0089] In addition, the same reference numerals will be used throughout the drawings to refer to components that perform similar functions or operations. Throughout the application, when a component is referred to as being connected to another component, the component may not only be directly connected to the other component, but also be indirectly connected to the other component via another component. In addition, unless otherwise specified, the inclusion of a certain element does not mean the exclusion of other elements, but rather means that such elements may be further included.

[0090] In addition, unless there is a particular limitation, the description embodying an element by limitation or addition can be applied to all inventions without limiting a specific invention.

[0091] Furthermore, in the description and claims of the present application, unless otherwise stated, the singular form is intended to include the plural form.

[0092] In addition, in the invention description and claims of this application, unless otherwise stated, "or" includes "and". Therefore, "including A or B" refers to three cases, namely, the case including A, the case including B, and the case including A and B.

[0093] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0094] Figure 3 is a schematic diagram of a cable-type battery cell having a built-in member that is a conductive metal sheet according to an embodiment of the present invention.

[0095] Reference Figure 3 The cable-type battery cell may include: a cable-type electrode assembly 500, the cable-type electrode assembly 500 including an internal electrode support 100, and one or more internal electrodes 200, an external isolation layer 300 and an external electrode 400 spirally wound on the internal electrode support 100 in sequence; and a built-in component 600, the built-in component 600 is configured to accommodate the cable-type electrode assembly 500, wherein the built-in component 600 may be made of a conductive material.

[0096] The term "spiral" refers to a shape that is twisted in a certain range, which is similar to the shape of an ordinary spring, and the term "helix" can be used interchangeably therewith.

[0097] Each of the inner electrode, the isolation layer, and the outer electrode may have a strip structure extending in one direction.

[0098] The built-in member 600 may be made of a conductive material, for example, it may be configured in the form of a metal sheet including aluminum, nickel, or copper having excellent electrical conductivity, or an alloy thereof.

[0099] The internal electrode may include a first internal electrode, and the first internal electrode may include a first internal current collector 210 and a first internal active material layer 220 formed on the first internal current collector 210 .

[0100] The outer isolation layer 300 may be an electrolyte layer or a separator.

[0101] The external electrode 400 may include an external current collector 410 and an external active material layer 420 formed on the external current collector 410 .

[0102] A polymer layer 440 may be formed on an outer surface of the outer current collector 410 of the outer electrode 400 .

[0103] The polymer layer 440 may be an adhesive layer for adhesion between the outer surface of the outer current collector 410 and the built-in member 600 .

[0104] The polymer layer 440 can be made of any one selected from the group consisting of polypropylene, polycarbonate, polyethylene, styrene-butadiene rubber, sodium carboxymethyl cellulose, polyvinylidene fluoride, polyvinylidene fluoride copolymer, polytetrafluoroethylene, polystyrene, polyacrylonitrile, polyimide, polyacrylic acid, sodium polyacrylate, polyvinyl alcohol, sodium alginate, polymethacrylic acid and carboxymethyl chitosan, or two or more thereof.

[0105] The polymer material of the adhesive layer is not limited as long as the adhesive layer can bond the sheath member and the built-in member to each other.

[0106] The adhesive layer may be replaced by a pressure sensitive adhesive.

[0107] The cable-type electrode assembly 500 may include an internal member 600 that is added to the external current collector 410 and contacts a surface of the external current collector opposite to a surface of the external current collector 410 on which the external active material layer 420 is formed.

[0108] The inner electrode support 100 may be configured to have an open structure defining a space therein.

[0109] The inner electrode support 100 may be configured in the form of at least one spirally wound wire, at least one spirally wound sheet, a twisted wire, a linear wire, a hollow fiber, or a mesh support.

[0110] The hollow fiber may be made of at least one selected from the group consisting of polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, polyimide, polyethylene terephthalate, polyamideimide, polyesterimide, polyethersulfone, and polysulfone.

[0111] The inner electrode support 100 may include two or more linear inner electrode supports spirally wound to cross each other.

[0112] An inner electrode current collector core, a lithium ion supply core including an electrolyte, or a filling core may be formed in a space defined by the inner electrode support 100 .

[0113] The inner electrode current collector core may be made of carbon nanotubes, stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel surface-treated with carbon, nickel, titanium, or silver; aluminum-cadmium alloy; a non-conductive polymer surface-treated with a conductive agent; or a conductive polymer.

[0114] The lithium ion supply core may include a gel polymer electrolyte and a support.

[0115] The electrolyte can be a non-aqueous electrolyte using ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), γ-butyrolactone (γ-BL; butyrolactone), sulfolane, methyl acetate (MA; methylacetate) or methyl propionate (MP; methylpropionate).

[0116] The electrolyte may include an electrolyte selected from solid electrolytes using polyethylene oxide (PEO), polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulfide (PES), or polyvinyl acetate (PVAc).

[0117] The electrolyte may further include a lithium salt.

[0118] The lithium salt may be selected from the group consisting of LiCl, LiBr, LiI, LiClO4, LiBF4, LiB 10 Cl 10 , any one of the group consisting of LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, lithium chloroborane, low-aliphatic lithium carbonate and lithium tetraphenylborate, or a mixture of two or more thereof.

[0119] Polyethylene oxide (PEO), polyvinylidene fluoride (PVdF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP), polymethyl methacrylate (PMMA), polyacrylonitrile (PAN), or polyvinyl acetate (PVAc) can be used as the gel polymer electrolyte.

[0120] The first inner electrode may include a first inner current collector 210 and a first inner active material layer 220 formed on one surface of the first inner current collector 210 , and the outer electrode 400 may include an outer current collector 410 and an outer active material layer 420 formed on one surface of the outer current collector 410 .

[0121] A polymer film layer may further be formed on at least one of the other surface of the first inner current collector 210 and the other surface of the outer current collector 410. The addition of the polymer film layer increases the thickness of the thin first inner current collector 210 and the outer current collector 410 to support the active material layer. Furthermore, the addition of the flexible polymer film layer, rather than increasing the thickness of the first inner current collector 210 and the outer current collector 410, allows for easy deformation during the spiral winding process.

[0122] The polymer film layer may be made of any one selected from the group consisting of polyolefin, polyester, polyimide, and polyamide, or a mixture of two or more thereof.

[0123] A polymer support layer 440 may be further formed on a surface of at least one of the first inner active material layer 220 and the outer active material layer 420 .

[0124] The polymer support layer may be a porous polymer layer having a pore size of 0.01 μm to 10 μm and a porosity of 5% to 95%.

[0125] The polymer support layer may include a polar linear polymer, an oxide-based linear polymer, or a mixture thereof.

[0126] Figure 4 is a schematic diagram of a cable-type battery cell having an internal member, which is a conductive metal sheet, serving as an electrode tab for an external electrode according to an embodiment of the present invention.

[0127] Reference Figure 4 The built-in component 600 may be formed as a single layer or two or more laminated conductive layers. For example, the built-in component may be composed of a single layer structure made of a conductive material, or may be composed of two or more laminated layers each made of a conductive material.

[0128] The built-in member 600 may be in contact with the external electrode 400 .

[0129] The built-in member 600 may serve as an electrode tab of the external electrode 400 .

[0130] exist Figure 4 In the embodiment, the internal electrode tab welding part 231 for connection with the internal electrode tab 230 of the internal electrode 200 is formed, and the terminal connection wire 900 is coupled to the internal electrode tab 230 .

[0131] The built-in member 600 composed of a conductive layer may function as a conventional external electrode tab 430 .

[0132] That is, since the built-in member 600 performs the function of the external electrode tab 430 of the external electrode 400 , electrode terminal connection can be performed at the outer surface of the cable-type battery cell in the length direction and at both ends of the cable-type battery cell.

[0133] The internal electrode 200 , which is opposite to the external electrode 400 , is connected to an internal electrode tab 230 extending from the internal electrode current collector 210 via an internal electrode tab welding portion 231 .

[0134] Figure 5 is an end cross-sectional view of a cable-type cell having an internal component that is a conductive metal sheet according to an embodiment of the present invention, Figure 6 is an end perspective view of a cable-type battery cell having a built-in member that is a conductive metal sheet according to an embodiment of the present invention, Figure 7 FIG. 1 is a BB cross-sectional view of a cable-type battery cell having an internal component, which is a conductive metal sheet, according to an embodiment of the present invention.

[0135] Reference Figures 5 to 7 When the internal member 600, which functions as the external electrode tab of the external electrode 400 and is made of a conductive sheet, contacts the internal electrode tabs 230 of the internal electrode 200 at both ends of the cable-type battery cell, a short circuit may occur. To prevent this, the internal electrode sealant layer 240 is formed.

[0136] The internal electrode 200 includes a first internal electrode including a first internal current collector 210 and a first internal active material layer 220 formed on one surface of the first internal current collector 210 , and the first internal electrode, the external separation layer 300 , and the external electrode 400 may constitute a single cell.

[0137] The external electrode 400 may include an external current collector 410 and an external active material layer 420 formed on one surface of the external current collector 410 , and the first internal electrode, the external separation layer 300 , and the external electrode 400 may constitute a single cell.

[0138] Reference Figure 5 1 is a cross-sectional view of one end of a cable-type battery of a single-cell type, with an inner electrode support 100 located at its center, and a first inner current collector 210, a first inner active material layer 220, an outer separation layer 300, an outer active material layer 420, an outer current collector 410, and a conductive built-in member 600 formed in contact with the outer current collector 410 are sequentially added to the inner electrode support 100 in an outward direction.

[0139] When viewing an end section of the single cell, the conductive built-in member 600 may be formed to wrap around a portion of a predetermined thickness of the outer current collector 410 , the outer active material layer 420 , and the outer separation layer 300 .

[0140] To prevent a short circuit due to contact between the built-in member 600 and the internal electrode 200 , the internal electrode sealant layer 240 may be formed from a portion of the end of the external separation layer 300 to which the built-in member 600 is not added to the first internal active material layer 220 .

[0141] The internal electrode tab 230 may be coupled to the first internal current collector 210 by welding, and an internal electrode tab welding part 231 configured to connect the end of the first internal current collector 210 and the internal electrode tab 230 to each other may be formed.

[0142] The internal electrode tab sealant layer 232 may be formed to non-conductively seal the internal electrode tab welding portion 231 .

[0143] In addition, a sealant layer for insulation may be further formed at the end of the inner supporter 600 .

[0144] Reference Figure 5 , it can be seen that the conductive built-in member 600 is added to wrap on a portion of the predetermined thickness of the outer current collector 410 , the outer active material layer 420 , and the outer isolation layer 300 .

[0145] Reference Figure 5 In the circular cross-sectional view perpendicular to the length direction of the cable-type battery cell shown in the upper part, the outermost built-in component 600 is shown to have the largest diameter while being added to wrap around a portion of the predetermined thickness of the outer current collector 410, the outer active material layer 420 and the outer isolation layer 300.

[0146] The built-in member 600 extends to a portion of the internal electrode tab 230 , and in consideration of the thickness of the built-in member, is between the first and second outer circles and between the second and third outer circles in the circular cross-sectional view.

[0147] The member located inside the built-in member 600 and between the third and fourth circles on the outside is the inner electrode sealant layer 240. The inner electrode sealant layer 240 is added from the end of the outer separation layer 300 to the first inner active material layer 220 where the built-in member 600 is not added.

[0148] Inside the inner electrode sealant layer 240 , a circular shape of the inner electrode tab weld sealant layer 232 configured to non-conductively seal the inner electrode tab weld 231 can be seen.

[0149] Inside the circular region of the inner electrode tab welding portion sealant layer 232 , a circular region of the inner electrode tab 230 coupled to the first inner current collector 210 by welding can be seen.

[0150] Finally, the innermost circle represents the inner electrode support 100 .

[0151] Figure 8 is a CC cross-sectional view of a cable-type bi-cell having a built-in member, which is a conductive metal sheet, according to an embodiment of the present invention.

[0152] Reference Figure 8 The cable-type battery cell includes a first internal electrode, an internal separation layer 800 spirally wound around the outside of the first internal electrode, and a second internal electrode 700 spirally wound around the outside of the internal separation layer 800 .

[0153] Figure 8 The cable-type battery shown in FIG is constructed in the form of a bicell, which includes a first inner electrode, an inner separator 800 , a second inner electrode 700 , an outer separator 300 , and an outer electrode 400 .

[0154] Specifically, Figure 8 The cable-type battery cell shown in the figure may include: an internal electrode support 100, a strip-shaped first internal electrode 200 spirally wound on the outside of the internal electrode support 100, a strip-shaped internal isolation layer 800 spirally wound on the outside of the first internal electrode 200, a strip-shaped second internal electrode 700 spirally wound on the outside of the internal isolation layer 800, an external isolation layer 300 spirally wound on the outside of the second internal electrode 700, an external electrode 400 spirally wound on the outside of the external isolation layer 300, and a built-in component 600 formed on the outside of the external electrode 400.

[0155] The second internal electrode 700 may include a second internal current collector 720 and a 2-1 internal active material layer 710 and a 2-2 internal active material layer 730 formed on both surfaces of the second internal current collector 720 , respectively.

[0156] The first internal electrode and the external electrode may be the same electrode, and the second internal electrode may be an electrode different from the first internal electrode and the external electrode.

[0157] If the first internal electrode and the external electrode are positive electrodes, the second internal electrode may be a negative electrode; if the first internal electrode and the external electrode are negative electrodes, the second internal electrode may be a positive electrode.

[0158] Each of the inner separation layer 800 and the outer separation layer 300 may be an electrolyte layer or a separator.

[0159] The built-in member 600 may be formed to wrap around both end surfaces of the cable-type battery cell.

[0160] If the cable-type battery cell is in the form of a single battery, the built-in member 600 may be added to wrap around a portion of the outer separation layer 300 and the outer electrode 400 exposed from both ends of the cable-type electrode assembly.

[0161] If the cable-type battery cell is in the form of a single cell, the non-conductive inner electrode sealant layer 240 may be formed from a portion of the outer separation layer 300 to which the built-in member 600 is not added to the first inner active material layer 220 .

[0162] At at least one of both ends of the cable-type electrode assembly, an internal electrode tab 230 may be formed in a portion of the first internal current collector where the built-in member and the sealant layer are not formed.

[0163] An internal electrode tab sealant layer 232 may be formed at the connection of the internal electrode tab 230 and the first internal current collector 210 .

[0164] If the cable-type battery is in the form of a bicell, the built-in member 600 may be added to wrap around the outer electrode 400 , the inner electrode 200 , a portion of the outer separator 300 , and a portion of the inner separator 800 exposed from both ends of the cable-type electrode assembly.

[0165] If the cable-type battery is in the form of a bi-battery, a non-conductive inner electrode sealant layer 240 may be formed from a portion of the outer isolation layer 300 to which the built-in component 600 is not added to the 2-1 inner active material layer 710, and a non-conductive inner electrode sealant layer 240 may be formed from a portion of the inner isolation layer 800 to which the built-in component 600 is not added to the 2-2 inner active material layer 730.

[0166] At least one of both ends of the cable-type electrode assembly, the inner electrode tab 230 may extend to a portion of the second inner current collector 720 where the built-in member 600 and the inner electrode sealant layer 240 are not formed.

[0167] The inner electrode sealant layer 240 may include any one selected from the group consisting of polypropylene, polypropylene-acrylic acid copolymer, polyethylene-acrylic acid copolymer, polyvinyl chloride, polypropylene-butylene-ethylene terpolymer, polyethylene, polyethylene and ethylene-propylene copolymer, or two or more thereof.

[0168] The cross-sectional shape of the cable-type battery cell may be any one of a circular shape, an elliptical shape, a triangular shape, a quadrilateral shape, a square shape, a rectangular shape, a polygonal shape, and an irregular shape.

[0169] The built-in member may be packaged to accommodate the cable-type electrode assembly.

[0170] The sheathing member may be in a form wrapped around built-in members formed at both end surfaces of the cable-type battery cell while exposing only a portion of the built-in member.

[0171] The sheathing member may be in a form wrapped around both ends of the cable-type battery cell except for the internal electrode tabs.

[0172] The first inner current collector and the second inner current collector must be isolated from each other by the inner isolation layer, and the second inner current collector and the outer current collector must be isolated from each other by the outer isolation layer. Therefore, the width of each of the inner isolation layer and the outer isolation layer, each of which is constructed in the form of a strip, can be greater than the width of each of the first inner current collector, the second inner current collector, and the outer current collector, and the length of each of the inner isolation layer and the outer isolation layer can be greater than the length of each of the first inner current collector, the second inner current collector, and the outer current collector.

[0173] At least one of the first inner current collector, the second inner current collector, and the outer current collector may further include a primer coating layer including a conductive agent and a binder.

[0174] The conductive agent may include any one of the group consisting of carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanotube, and graphene, or a mixture of two or more thereof.

[0175] The binder may be selected from polyvinylidene fluoride (PVDF), polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polybutyl acrylate, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, ethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, any one selected from the group consisting of acetatepropionate, cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxylmethyl cellulose, styrene-butadiene rubber, acrylonitrile-styrene-butadiene copolymer and polyimide, or two or more thereof.

[0176] At least one of the first inner current collector, the second inner current collector and the outer current collector may be made of stainless steel; aluminum; nickel; titanium; sintered carbon; copper; stainless steel surface-treated with carbon, nickel, titanium or silver; aluminum-cadmium alloy; a non-conductive polymer surface-treated with a conductive agent; a conductive polymer; a paste containing powders such as Ni, Al, Au, Ag, Pd-Ag, Cr, Ta, Cu, Ba or indium tin oxide (ITO); or a carbon paste containing carbon powder such as graphite, carbon black or carbon nanotubes.

[0177] The conductive polymer may be any one selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, and polythiazyl, or a mixture of two or more of them.

[0178] When each of the first internal electrode and the external electrode is a negative electrode and the second internal electrode is a positive electrode, each of the first internal active material and the external active material may include any one selected from the group consisting of natural graphite, artificial graphite, or carbon-containing materials; lithium titanium composite oxide (LTO); metals (Me) such as Si, Sn, Li, Zn, Mg, Cd, Ce, Ni, or Fe; alloys including the metal (Me); oxides (MeO x ); and complexes of the metal (Me) and carbon, or a mixture of two or more of them. When the second internal electrode is a positive electrode, the same situation as when each of the first internal electrode and the external electrode is a positive electrode as described below may be applicable.

[0179] When each of the first internal electrode and the external electrode is a positive electrode and the second internal electrode is a negative electrode, each of the first internal active material and the external active material may include any one selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, and LiNi 1-x-y-z Co x M1 y M2 z O2 (each of M1 and M2 is any one selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg, and Mo, and x, y, and z are atomic fractions of the oxide constituent elements independent of each other, where 0 ≤ x < 0.5, 0 ≤ y < 0.​​​​​The separator may have: a porous polymer substrate made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymers, propylene homopolymers, ethylene-butene copolymers, ethylene-hexene copolymers and ethylene-methacrylate copolymers; a porous polymer substrate made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyetheretherketones, polyethersulfones, polyphenylene oxides, polyphenylene sulfides and polyethylene naphthalate; a porous substrate made of a mixture of inorganic particles and a binder polymer; or a porous coating made of a mixture of inorganic particles and a binder polymer and formed on at least one surface of the porous polymer substrate.

[0182] Figure 9 is a schematic diagram of a cable-type battery cell including a plurality of internal electrodes according to an embodiment of the present invention, the cable-type battery cell having a built-in member serving as an external electrode tab, the built-in member being a conductive metal sheet.

[0183] Reference Figure 9 A cable-type battery cell may include: a cable-type electrode assembly, the cable-type electrode assembly including two or more internal electrodes 200, and an external isolation layer 300 and an external electrode 400 formed around the outer surfaces of the internal electrodes 200 and spirally wound in sequence; and a built-in component 600, the built-in component 600 being configured to accommodate the cable-type electrode assembly, wherein the built-in component 600 may be made of a conductive material.

[0184] The internal electrode 200 may be configured such that two or more linear internal electrodes are disposed in parallel in contact with each other, or two or more linear internal electrodes are disposed in a twisted state.

[0185] Although the twisted state is not particularly limited, the plurality of strands of electrodes may be twisted in a state of being arranged side by side in parallel, or the plurality of strands of electrodes may be arranged one on top of another and twisted like a braid.

[0186] If multiple internal electrodes 200 are provided, the internal electrodes can be tightly packed together, thereby reducing the diameter of the cable-type battery cell according to the present invention. Such a cable-type battery cell can be thinner than a conventional cable-type battery cell, thereby allowing the cable-type battery cells to be connected in series for a longer time, or multiple battery cells can be connected horizontally to form a sheet-type structure for use in smart textile or wearable applications.

[0187] By densely packing the internal electrodes with each other as described above, the inner diameter of the cable-type battery cell according to the present invention may be reduced.

[0188] However, if the internal electrode has a hollow portion, the internal electrode can be filled with electrolyte by a needle, but if the internal electrodes are densely packed as described above and have no hollow portion, it is not easy to fill the internal electrode with electrolyte using a needle as described above. Therefore, in the present invention, a method of filling the internal electrode with electrolyte when the internal electrode has no hollow portion, especially when the non-hollow internal electrodes are densely packed with each other, is studied. To this end, the inventors of the present application invented a method of encapsulating the electrode assembly by passing the electrode assembly through an electrolyte bath so that the electrolyte is absorbed into the battery cell, and after impregnation with the electrolyte bath, performing polymer coating to prevent the electrolyte from leaking to the outside.

[0189] The polymer electrolyte layer used for encapsulation has ion conductivity, allowing the electrolyte to be absorbed like a polymer electrolyte.

[0190] The cable-type secondary battery produced by this method is a cable-type secondary battery having non-hollow, densely packed inner electrodes, which facilitates injection of an electrolyte.

[0191] (Comparative Example 1)

[0192] Cable-type battery cells (original cable-type battery cells) were manufactured using a laminate sheet with a multilayer structure similar to the battery case of conventional pouch-type battery cells as an internal component wrapped around the outer surface of a cable-type electrode assembly. The resistance between the external electrode and the external electrode tab of the cable-type battery cells was measured. In the experiment, the external electrode was configured as the positive electrode.

[0193] (Example 1)

[0194] According to the present invention, a cable-type battery cell (a tab-less cable-type battery cell) was manufactured by adding an internal component having a conductive metal single-layer structure as a wrap around the outer surface of a cable-type electrode assembly. The resistance between the external electrode and the external electrode tab of this cable-type battery cell was measured. In the experiment, the external electrode was configured as a positive electrode. In Example 1, the internal component having a metal single-layer structure performed the function of the external electrode tab.

[0195] Figure 10 is a graph showing resistance between an external electrode and an external electrode tab based on length in a conventional cable-type battery cell and a cable-type battery cell having a metal layer as a built-in member according to the present invention.

[0196] exist Figure 10 In the graph of , a conventional cable-type battery cell is denoted as “original cable-type battery cell”, and a cable-type battery cell having a metal layer as a built-in component according to the present invention is denoted as “cable-type battery cell without electrode tabs”.

[0197] Reference Figure 10 , it can be seen that in the case of the cable-type battery cell including the built-in component having the multi-layer structure of Comparative Example 1 (original cable-type battery cell), as the length of the cable-type battery cell increases, the resistance between the positive electrode and the positive electrode tab increases sharply at 300 mm.

[0198] It can be seen that in the case of the cable-type battery cell including the built-in component having a single metal layer structure according to Example 1 of the present invention (a cable-type battery cell without an electrode tab), as the length of the cable-type battery cell increases, even with a length of the cable-type battery cell of 500 mm, the resistance between the positive electrode and the positive electrode tab is measured to be 12.5 mOhm or less.

[0199] Those skilled in the art to which the present invention pertains will appreciate that, based on the above description, various applications and modifications are possible within the scope of the present invention.

[0200] (Explanation of Reference Numerals)

[0201] 100: Internal electrode support

[0202] 200: Internal electrode

[0203] 210: First inner current collector

[0204] 220: First inner active material layer

[0205] 230: Internal electrode tab

[0206] 231: Internal electrode tab welding part

[0207] 232: Internal electrode tab sealant layer

[0208] 240: Internal electrode sealant layer

[0209] 300: External isolation layer

[0210] 400: External electrode

[0211] 410: External current collector

[0212] 420: External active material layer

[0213] 430: External electrode tab

[0214] 440: polymer support layer

[0215] 500: Cable-type electrode assembly

[0216] 600: Built-in components

[0217] 610: First built-in component layer

[0218] 620: Second built-in component layer

[0219] 630: The third built-in component layer

[0220] 640: Fourth built-in component layer

[0221] 700: Second internal electrode

[0222] 710:2-1 Internal active material layer

[0223] 720: Second inner current collector

[0224] 730:2-2 Internal active material layer

[0225] 800: Internal isolation layer

[0226] 900: Terminal connection wire.

Claims

1. A cable-type battery cell, comprising: A cable-type electrode assembly comprising an inner electrode support, and one or more inner electrodes, an outer separator, and an outer electrode spirally wound on the inner electrode support in sequence; as well as An internal component configured to accommodate the cable-type electrode assembly, wherein The built-in component is made of conductive material. 2 . The cable-type battery cell according to claim 1 , wherein the built-in member is formed as a single layer or two or more laminated conductive layers. 3 . The cable-type battery cell according to claim 1 , wherein the built-in member is in contact with the external electrode. 4 . The cable-type battery cell according to claim 1 , wherein the built-in member serves as an electrode tab of the external electrode.

5. The cable-type battery cell according to claim 1, wherein The internal electrodes include a first internal electrode, The first internal electrode includes a first internal current collector and a first internal active material layer formed on one surface of the first internal current collector, and The first internal electrode, the external separator, and the external electrode constitute a single cell.

6. The cable-type battery cell according to claim 5, wherein: The external electrode includes an external current collector and an external active material layer formed on one surface of the external current collector, and The first internal electrode, the external separator, and the external electrode constitute a single cell.

7. The cable-type battery cell according to claim 5, wherein The inner electrode includes an inner separator spirally wound outside the first inner electrode and a second inner electrode spirally wound outside the inner separator, and The first inner electrode, the inner separator, the second inner electrode, the outer separator, and the outer electrode constitute a bicell.

8. The cable-type battery cell according to claim 7, wherein the second internal electrode comprises: a second inner current collector; and A 2-1 inner active material layer and a 2-2 inner active material layer are respectively formed on both surfaces of the second inner current collector.

9. The cable-type battery cell according to claim 7, wherein The first inner electrode and the outer electrode are the same electrode, and The second inner electrode is an electrode different from the first inner electrode and the outer electrode.

10. The cable-type battery cell according to claim 7, wherein If the first inner electrode and the outer electrode are positive electrodes, the second inner electrode is negative electrodes, and If the first inner electrode and the outer electrode are cathodes, the second inner electrode is anode. 11 . The cable-type battery cell according to claim 7 , wherein each of the inner and outer separation layers is an electrolyte layer or a separator. 12 . The cable-type battery cell according to claim 1 , wherein the built-in member is wrapped around both end surfaces of the cable-type battery cell.

13. The cable-type battery cell according to claim 12, wherein: If the cable-type battery cell is a single battery, the built-in member is added to wrap around a portion of the outer separation layer and the outer electrodes exposed from both ends of the cable-type electrode assembly.

14. The cable-type battery cell according to claim 13, wherein: If the cable-type battery cell is a single battery, a non-conductive inner electrode sealant layer is formed from a portion of the outer separation layer where the built-in member is not formed to the first inner active material layer.

15. The cable-type battery cell according to claim 14, wherein: An internal electrode tab is formed in a portion of the first internal current collector where the built-in member and the sealant layer are not formed, at at least one of both ends of the cable-type electrode assembly. 16 . The cable-type battery cell of claim 15 , wherein an internal electrode tab sealant layer is formed at a connection between the internal electrode tab and the first internal current collector.

17. The cable-type battery cell according to claim 12, wherein: If the cable-type battery is a bicell, the built-in member is added to wrap around the external electrodes exposed from both ends of the cable-type electrode assembly, the internal electrodes, a portion of the external separator, and a portion of the internal separator.

18. The cable-type battery cell according to claim 17, wherein If the cable-type battery cell is a bi-cell, a non-conductive inner electrode sealant layer is formed from a portion of the outer separator layer to which the built-in component is not added to the 2-1 inner active material layer; and A non-conductive inner electrode sealant layer is formed from a portion of the inner separation layer to which the built-in member is not added to the 2-2 inner active material layer.

19. The cable-type battery cell according to claim 18, wherein: At least one of both ends of the cable-type electrode assembly, an internal electrode tab extends to a portion of the second internal current collector where the built-in member and the internal electrode sealant layer are not formed.

20. The cable-type battery cell according to claim 19, wherein the inner electrode sealant layer comprises any one selected from the group consisting of propylene, polypropylene-acrylic acid copolymer, polyethylene-acrylic acid copolymer, polyvinyl chloride, polypropylene-butylene-ethylene terpolymer, polyethylene, polyethylene, and ethylene-propylene copolymer, or two or more thereof. 21 . The cable-type battery cell according to claim 1 , wherein a cross-sectional shape of the cable-type battery cell is any one of a circular shape, an elliptical shape, a triangular shape, a quadrilateral shape, a square shape, a rectangular shape, a polygonal shape, and an irregular shape. 22 . The cable-type battery cell according to claim 1 , wherein the built-in member is packaged to accommodate the cable-type electrode assembly. 23 . The cable-type battery cell according to claim 1 , comprising a sheathing member formed on an outer surface of the built-in member, the sheathing member being configured to expose only a portion of the built-in member. 24 . The cable-type battery cell according to claim 23 , wherein the sheathing member is wrapped around the built-in members formed at both ends of the cable-type battery cell. 25 . The cable-type battery cell according to claim 24 , wherein the sheathing member is wrapped around both ends of the cable-type battery cell except for the internal electrode tab.

26. A cable-type battery cell, comprising: A cable-type electrode assembly comprising two or more inner electrodes, and an outer separator and an outer electrode formed around outer surfaces of the two or more inner electrodes and spirally wound in sequence; as well as An internal component configured to accommodate the cable-type electrode assembly, wherein The built-in component is electrically conductive. 27 . The cable-type battery cell according to claim 26 , wherein the internal electrodes are configured such that two or more linear internal electrodes are disposed in parallel in contact with each other, or two or more linear internal electrodes are disposed in a twisted state.

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