Electrode and secondary battery

Abstract

An electrode and a secondary battery are disclosed. The electrode includes: a substrate; an active material layer on a portion of the substrate; and a connection tab defining a substrate tab area by surrounding another portion of the substrate.

Description

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0080341, filed on June 20, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] The embodiments of this disclosure relate to electrodes and secondary batteries. Background Technology

[0003] Unlike primary batteries, which cannot be recharged, secondary batteries are rechargeable and dischargeable. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motors in hybrid and electric vehicles, as well as for energy storage. These secondary batteries include: electrode assemblies comprising electrodes (including positive and / or negative electrodes), a housing of the electrode assemblies, and electrode terminals connected to the electrode assemblies, etc.

[0004] With technological advancements, there is a need for higher-capacity rechargeable batteries. Accordingly, multiple rechargeable batteries can be electrically connected and used. For example, rechargeable batteries may be applied to electronic devices in the form of rechargeable battery modules comprising multiple rechargeable batteries and / or battery packs comprising multiple rechargeable battery modules. Electronic devices include those requiring high-output and / or high-capacity rechargeable batteries, such as electric vehicles.

[0005] An electrode assembly includes electrodes and a diaphragm located between the electrodes. For example, an electrode assembly includes electrodes (which include a negative electrode and a positive electrode) and a diaphragm disposed between the negative electrode and the positive electrode. Accordingly, the electrode assembly may be configured such that the negative electrode, the diaphragm, and the positive electrode are alternately formed.

[0006] The electrode includes a substrate and an active material layer provided on at least one surface of the substrate.

[0007] For example, if the electrode is a positive electrode, the substrate may include, for example, aluminum (Al). If the electrode is a negative electrode, the substrate may include, for example, copper (Cu). In this way, the electrode may include a metal as the substrate. This is because the electrode allows current to flow through the substrate.

[0008] However, if the substrate is made entirely of metal, the secondary battery may become heavier. Additionally, for example, if the separator is damaged, a short circuit is highly likely to occur between the negative and positive electrodes if the substrate is made entirely of metal.

[0009] The information disclosed in the background section of this invention is provided to improve the understanding of the background of this invention, and therefore may include information that does not constitute related technology. Summary of the Invention

[0010] According to one aspect of the present invention, an electrode and / or a secondary battery is provided, comprising a composite substrate comprising a metal and a polymer.

[0011] According to another aspect of the embodiments of the present invention, an electrode and / or a secondary battery is provided, which enables metal-to-metal connections in a composite substrate, wherein a polymer is formed between the metals.

[0012] According to another aspect of the embodiments of the present invention, an electrode and / or a secondary battery is provided, wherein the bending length can be reduced in the substrate terminal area.

[0013] According to another aspect of the embodiments of the present invention, an electrode and / or a secondary battery is provided that can increase the range of applicable thin-film battery cells while improving safety.

[0014] However, the aspects and technical problems to be addressed by the present invention are not limited to those described above, and those skilled in the art will clearly understand from the following description other aspects and problems not mentioned.

[0015] According to one or more embodiments of the present invention, an electrode includes: a substrate; an active material layer on a portion of the substrate; and a connecting tab defining a substrate tab region by surrounding another portion of the substrate.

[0016] According to one or more embodiments of the present invention, a secondary battery includes: an electrode assembly including an electrode, the electrode including: a substrate; an active material layer on a portion of the substrate; and a connecting tab defining a substrate tab region around another portion of the substrate; and a housing housing the electrode assembly. Attached Figure Description

[0017] The following figures illustrate some embodiments of the invention and are provided together with the detailed description of the invention below to further understand the technical concept of the invention; however, the invention should not be construed as limited to the content described in these figures, in which:

[0018] Figure 1 and Figure 2 A diagram illustrating a secondary battery according to an embodiment of the present invention is provided.

[0019] Figure 3 A cross-sectional view of a substrate according to an embodiment of the present invention is shown for illustrative purposes.

[0020] Figure 4 A top view illustrating the application of the composite substrate to the electrodes;

[0021] Figure 5 For along Figure 4 The cross-sectional view taken by line A-A' is shown in the figure;

[0022] Figure 6 Figures are provided for comparing an example of a lead patch for an electrode attached to a common substrate and an example of a lead patch for an electrode attached to a composite substrate.

[0023] Figure 7 A top view showing the electrode to which the composite substrate is applied according to an embodiment of the present invention;

[0024] Figure 8A and Figure 8B respectively along Figure 7 The cross-sectional views taken by lines B-B' and C-C' are shown in the figure;

[0025] Figure 9 Figures are provided for comparison of an example of a lead patch attached to an electrode applied to a composite substrate and an example of a lead patch attached to an electrode applied to a composite substrate according to an embodiment of the present invention.

[0026] Figure 10 A top view showing the electrode to which the composite substrate is applied according to another embodiment of the present invention;

[0027] Figure 11A and Figure 11B respectively along Figure 10 The cross-sectional view taken by lines D-D' and E-E' is shown in the figure;

[0028] Figure 12 A top view illustrating an example of a lead-attached terminal block to an electrode according to another embodiment of the present invention;

[0029] Figure 13 A top view showing the electrode to which the composite substrate is applied according to another embodiment of the present invention;

[0030] Figure 14A and Figure 14B respectively along Figure 13 The cross-sectional views taken by lines F-F' and G-G' are shown in the figure; and

[0031] Figure 15 A top view illustrating an example of a lead-attached tab to an electrode according to another embodiment of the invention. Detailed Implementation

[0032] In this document, some embodiments of the invention will be described in further detail. However, the embodiments are presented as examples, and the invention is not limited thereto, but is defined by the scope of the claims.

[0033] Unless otherwise stated herein, when a component (such as a layer, membrane, region, plate, etc.) is described as being “on” another component, it includes not only the case where the component is “directly on” the other component, but also the case where another component is present in between.

[0034] Unless otherwise stated in this specification, the singular form may also include the plural form. Furthermore, unless otherwise stated, "A or B" may mean "including A, including B, or including both A and B".

[0035] As used herein, the term "combination of" may mean a mixture of components, a laminate, a composite, a copolymer, an alloy, an admixture, and a reaction product.

[0036] Figure 1 and Figure 2 A diagram illustrating a secondary battery according to an embodiment of the present invention is provided.

[0037] Secondary battery 100

[0038] Based on the shape of the secondary battery 100, the secondary battery 100 can be classified into cylindrical, prismatic, pouch-shaped, and coin-shaped batteries, etc. Figure 1 and Figure 2 For example, a pouch battery. (See reference) Figure 1 and Figure 2 The secondary battery 100 may include: an electrode assembly 40, wherein a separator 30 is located between a positive electrode 10 and a negative electrode 20; and a housing 50, in which the electrode assembly 40 is built-in or housed. The positive electrode 10, the negative electrode 20, and the separator 30 may be impregnated with an electrolyte (not shown). Figure 1 and Figure 2 As shown, the secondary battery 100 may include electrode terminals 70, namely, positive electrode terminal 71 and negative electrode terminal 72, which serve as electrical paths for conducting current formed in the electrode assembly 40 to the outside.

[0039] Positive electrode active material

[0040] As the positive electrode active material, compounds capable of reversibly inserting and deintercalating lithium (e.g., lithiation intercalation compounds) can be used. In one embodiment, a composite oxide of lithium and at least one metal selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0041] The composite oxide can be a lithium transition metal composite oxide, examples of which include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0042] As an example, a compound represented by any of the following chemical formulas can be used: Li a A1-b X b O 2-c D c (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05); Li a Mn 2-b X b [[ID=​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​In the above chemical formulas, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L 1 It is Mn, Al, or a combination thereof.

[0044] For example, the positive electrode active material can be a high-nickel positive electrode active material, wherein the nickel content is 80 mol% or more, 85 mol% or more, 90 mol% or more, 91 mol% or more, or 94 mol% or more and 99 mol% or less, based on 100 mol% of metals other than lithium in the lithium transition metal composite oxide. High-nickel positive electrode active materials can achieve high capacity and therefore can be used in high-capacity, high-density secondary batteries.

[0045] Positive electrode 10

[0046] The positive electrode 10 for the secondary battery 100 may include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer includes a positive electrode active material and may further include a binder and / or a conductive material.

[0047] For example, the positive electrode may further include additives that can be used as a sacrificial positive electrode.

[0048] In one embodiment, the content of the positive electrode active material may be 90 wt% to 99 wt% relative to 100 wt% of the positive electrode active material layer, and the contents of the binder and conductive material may be 0.5 wt% to 5 wt% respectively based on 100 wt% of the positive electrode active material layer.

[0049] Adhesives are used to ensure good adhesion between positive electrode active material particles and to the current collector. Representative examples of adhesives include, but are not limited to, polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylate resin, polyester resin, nylon, etc.

[0050] The conductive material is used to impart conductivity to the electrode, and any suitable material that does not cause chemical changes and is conductive can be used in the battery being constructed. Examples of the conductive material include carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, and carbon nanotube; metal-based materials containing copper, nickel, aluminum, and silver in the form of metal powder or metal fiber; conductive polymers such as polyphenylene derivatives; or mixtures thereof.

[0051] In one embodiment, Al can be used as the current collector, but the present invention is not limited thereto. <​​​​​​​​​​​​​​​​​​​​​The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles, and an amorphous carbon coating on the surface of the core.

[0059] Si-based or Sn-based negative electrode active materials can be used in combination with carbon-based negative electrode active materials.

[0060] negative electrode 20

[0061] The negative electrode 20 for the secondary battery 100 includes a current collector and a negative electrode active material layer located on the current collector. The negative electrode active material layer includes a negative electrode active material and may further include a binder and / or a conductive material.

[0062] For example, the negative electrode active material layer may include 90 to 99.5 wt% negative electrode active material, 0.5 to 5 wt% binder and 0 to 5 wt% conductive material.

[0063] The binder is used to ensure good adhesion between the negative electrode active material particles and also to the current collector. The binder can be a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof.

[0064] Non-aqueous adhesives may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide, or combinations thereof.

[0065] Waterborne adhesives may be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0066] If an aqueous binder is used as the negative electrode binder, it may further include a cellulose compound capable of imparting viscosity. One or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be used as cellulose compounds. In one embodiment, Na, K, or Li may be used as the alkali metal.

[0067] Dry adhesives are polymeric materials capable of being fibrous, and may be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0068] Conductive materials are used to impart conductivity to electrodes, and any suitable material that does not cause chemical changes and is conductive can be used in the battery being constructed. Some examples include carbon-based materials such as natural graphite, synthetic graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, and carbon nanotubes; metallic materials containing copper, nickel, aluminum, and silver in the form of metal powders or metal fibers; conductive polymers such as polyphenylene derivatives; or mixtures thereof.

[0069] In one embodiment, the negative electrode current collector may be selected from any one of copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with conductive metal, and combinations thereof.

[0070] Electrolyte (not shown)

[0071] The electrolyte used in the secondary battery 100 includes a non-aqueous organic solvent and a lithium salt.

[0072] Non-aqueous organic solvents are used as a medium through which ions participating in the battery's electrochemical reactions can move.

[0073] In one embodiment, the non-aqueous organic solvent may be a carbonate, ester, ether, ketone or alcohol solvent, aprotic solvent or a combination thereof.

[0074] Examples of carbonate solvents may include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC), butyl carbonate (BC), etc.

[0075] Examples of ester solvents include methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanoic acid lactone, methacryloxylactone, valproic acid lactone, caprolactone, etc.

[0076] Examples of ether solvents may include dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ether, ethylene glycol dimethyl ether, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, and tetrahydrofuran. In one embodiment, cyclohexanone and the like may be used as ketone solvents. Ethanol, isopropanol, and the like may be used as alcohol solvents, and nitriles such as R-CN (where R is a straight-chain, branched, or cyclic hydrocarbon group having 2 to 20 carbon atoms and may include double bonds, aromatic rings, or ether bonds), amides such as dimethylformamide, dioxolane such as 1,3-dioxolane and 1,4-dioxolane, sulfolane, and the like may be used as aprotic solvents.

[0077] Non-aqueous organic solvents can be used alone, or in combination of two or more.

[0078] Alternatively, if carbonate solvents are used, a mixture of cyclic carbonates and chain carbonates can be used, and the cyclic carbonates and chain carbonates can be mixed in a volume ratio of 1:1 to 1:9.

[0079] Lithium salts are materials dissolved in non-aqueous organic solvents and used as a source of lithium ions in batteries, enabling basic cell operations and facilitating the movement of lithium ions between the positive and negative electrodes. Representative examples of lithium salts may include those selected from LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiAlO2, LiAlCl4, LiPO2F2, LiCl, LiI, LiN(SO3C2F5)2, Li(FSO2)2N (lithium bis(fluorosulfonyl)imide, LiFSI), LiC4F9SO3, and LiN(C x F 2x+ 1SO2)(C y F 2y+1 One or more of the following: SO2 (where x and y are integers from 1 to 20), lithium trifluoromethane sulfonate, lithium tetrafluoroethane sulfonate, lithium difluorobis(oxalate)phosphate (LiDFBOP), and lithium bis(oxalate)borate (LiBOB).

[0080] Diaphragm 30

[0081] Depending on the type of secondary battery 100, the separator 30 may be present between the positive electrode 10 and the negative electrode 20. As the separator 30, polyethylene, polypropylene, polyvinylidene fluoride, or multilayer membranes of two or more layers thereof may be used, and hybrid multilayer membranes such as polyethylene / polypropylene bilayer membranes, polyethylene / polypropylene / polyethylene trilayer membranes, or polypropylene / polyethylene / polypropylene trilayer membranes may be used.

[0082] The diaphragm 30 may include a porous substrate and a coating, the coating comprising an organic material, an inorganic material or a combination thereof, and located on one or both sides or opposite sides of the porous substrate.

[0083] The porous substrate may comprise a polymer film formed from at least one polymer selected from polyolefins (such as polyethylene and polypropylene), polyesters (such as polyethylene terephthalate and polybutylene terephthalate), polyacetal, polyamide, polyimide, polycarbonate, polyetherketone, polyaryl etherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fiber, and polytetrafluoroethylene (e.g., Teflon).

[0084] In one embodiment, the organic material may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0085] In one embodiment, the inorganic material may include, but is not limited to, inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0086] Organic and inorganic materials can exist in a mixed form in a coating, or they can exist in a stacked form that includes a coating containing organic materials and a coating containing inorganic materials.

[0087] Figure 3 A cross-sectional view of a substrate according to an embodiment of the present invention is shown schematically.

[0088] exist Figure 3 In the figure, 210 represents a substrate according to an embodiment of the present invention.

[0089] For example, the function of the substrate 210 according to an embodiment of the present invention may be related to... Figure 1 and Figure 2 The described current collectors have the same or similar functions.

[0090] For example, substrate 210 allows current to flow through electrodes (e.g., including regarding...). Figure 1 and Figure 2 (Described as positive electrode 10 or negative electrode 20). For example, substrate 210 provides a path for electrons to travel to the active material layer formed on substrate 210 via current conduction and / or current collection (e.g., including regarding...). Figure 1 and Figure 2 (The coating described). For this purpose, substrate 210 may include a conductive material. In one embodiment, for example, substrate 210 includes a metal.

[0091] However, if the substrate 210 consists only of metal, there may be a problem that the weight of the substrate 210 becomes excessive. Additionally, if the separator located between the electrodes (e.g., including regarding...) Figure 1 and Figure 2 If the diaphragm 30 described is damaged or shrinks, a short circuit may occur between the electrodes insulated by the diaphragm.

[0092] One or more embodiments of the present invention are provided to avoid these problems.

[0093] An electrode according to an embodiment of the present invention (e.g., including about) Figure 1 and Figure 2 The described positive electrode 10 or negative electrode 20 includes a substrate 210 and an active material layer provided on a portion of the substrate 210 (e.g., including information about...). Figure 1 and Figure 2 (Described coating).

[0094] According to an embodiment of the present invention, the substrate 210 includes an insulating layer 210p and a conductive layer 210m. In this document, the substrate 210 including the insulating layer 210p and the conductive layer 210m may be referred to as a composite substrate.

[0095] The insulating layer 210p allows the shape of the substrate 210 to be supported. For example, even if the conductive layer 210m is formed thin, the insulating layer 210p can still allow the substrate 210 to maintain its shape.

[0096] In one embodiment, the insulating layer 210p comprises a material having a lower density than the conductive layer 210m. Therefore, the insulating layer 210p can reduce weight compared to if the substrate consists only of the conductive layer. For example, the insulating layer 210p comprises an insulating material.

[0097] In one embodiment, the insulating material includes at least one selected from the group consisting of polymeric materials and polymeric composite materials.

[0098] In one embodiment, the polymer material is at least one selected from the group consisting of polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, aromatic polyamide, polyphthalamide, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, poly(p-phenylene terephthalamide), ethylene propylene rubber, polyoxymethylene, epoxy resin, phenolic resin, polytetrafluoroethylene, polyphenylene sulfide, polyvinylidene fluoride, silicone rubber, polycarbonate, cellulose and its derivatives, starch and its derivatives, protein and its derivatives, polyvinyl alcohol and its crosslinking products, and polyethylene glycol and its crosslinking products.

[0099] Polymer composites are composite materials that include both polymeric and inorganic materials. Inorganic materials include, for example, ceramic materials, glass materials, and ceramic composites.

[0100] The conductive layer 210m conducts and / or collects current in the substrate 210. Thus, the conductive layer 210m provides a pathway for electrons to move to the active material layer. Accordingly, the conductive layer 210m comprises a conductive material.

[0101] In one embodiment, the conductive material is at least one selected from the group consisting of metallic materials, carbon-based materials, and combinations thereof.

[0102] In one embodiment, the metallic material is at least one selected from the group consisting of silver (Ag), copper (Cu), gold (Au), aluminum (Al), tungsten (W), zinc (Zn), nickel (Ni), iron (Fe), platinum (Pt), tin (Sn), and alloys of two or more of these materials.

[0103] In this case, the metal material can be selected, for example, based on the polarity of the electrode. For example, when the electrode is a positive electrode, the metal material may include aluminum. For example, when the electrode is a negative electrode, the metal material may include copper.

[0104] In one embodiment, the carbon-based material is at least one selected from the group consisting of graphite, carbon nanotubes, and graphene.

[0105] A conductive layer 210m is provided on at least one surface of the insulating layer 210p. For example, the conductive layer 210m may be formed on one surface of the insulating layer 210p, or for example, the conductive layer 210m may be formed on two or opposite surfaces of the insulating layer 210p. For example, the conductive layer 210m may include a first conductive layer formed on one surface of the insulating layer 210p and a second conductive layer formed on the other surface of the insulating layer 210p. For example, as... Figure 3 As illustrated, the first conductive layer and the second conductive layer can be insulated from each other by the insulating layer 210p.

[0106] In this way, the substrate 210 can reduce its overall weight by including an insulating layer 210p that is relatively lighter than the conductive layer 210m. Additionally, the substrate 210 can help reduce the weight of the secondary battery 100.

[0107] Furthermore, the substrate 210 can prevent or substantially prevent other components from penetrating the substrate 210 by including an insulating layer 210p. In one embodiment, the insulating layer 210p has a greater elongation than the conductive layer 210m. Therefore, in a nail penetration test, the substrate 210 can improve its short-circuit resistance by the elongation of the internal insulating layer 210p. Additionally, the substrate 210 can improve safety by including the insulating layer 210p, thereby increasing the voltage drop and reducing resistance. In one embodiment, the substrate 210 can improve the safety of the secondary battery 100.

[0108] This paper describes the electrodes to which these composite substrates are applied.

[0109] Figure 4 A top view illustrating the application of the composite substrate to the electrodes.

[0110] Figure 5 For along Figure 4 The cross-sectional view taken by line A-A' is shown in the figure.

[0111] exist Figure 4 and Figure 5 In the text, 200 indicates an electrode (e.g., including information about...). Figures 1 to 3 (Described electrodes).

[0112] Electrode 200 includes a positive electrode 10 and / or a negative electrode 20.

[0113] Electrode 200 includes substrate 210 (e.g., including about Figure 3 The substrate 210 described), and the active material layer 220 (e.g., including information about...) Figure 3 The active material layer described) and the connecting piece 240.

[0114] Such as about Figure 3 As described, the substrate 210 includes an insulating layer 210p and a conductive layer 210m formed on at least one surface of the insulating layer 210p. For example, the conductive layer 210m may be formed on two or opposite surfaces of the insulating layer 210p. In one embodiment, for example, the conductive layer 210m includes a first conductive layer formed on one surface of the insulating layer 210p and a second conductive layer formed on the other surface of the insulating layer 210p.

[0115] The active material layer 220 includes active materials (e.g., including those related to...) Figure 1 and Figure 2 The described active material), conductive material (e.g., including those related to...) Figure 1 and Figure 2 The described conductive material) and / or adhesive (e.g., including those related to...) Figure 1 and Figure 2 (The adhesive described).

[0116] An active material layer 220 is provided on the substrate 210. In one embodiment, for example, the active material layer 220 may be coated on a portion of the substrate 210 in a slurry state. In another embodiment, for example, the active material layer 220 may be attached to a portion of the substrate 210 in a standalone film state.

[0117] An active material layer 220 is provided on a portion of the substrate 210. In one embodiment, for example, the active material layer 220 may be provided on a portion of one surface of the substrate 210. In one embodiment, for example, as... Figure 5 As illustrated, the active material layer 220 may be provided on portions of two or opposite surfaces of the substrate 210. In one embodiment, if the active material layer 220 is provided on two or opposite surfaces of the substrate 210, the active material layers 220 provided on the two or opposite surfaces of the substrate 210 may be provided symmetrically with respect to each other with respect to the substrate 210 as the center. However, in one embodiment, the active material layer 220 provided on one surface of the substrate 210 and the active material layer 220 provided on the other surface of the substrate 210 may be provided to occupy different areas.

[0118] The active material layer 220 is provided, for example, on the conductive layer 210m. For example, the active material layer 220 includes a first active material layer formed on the first conductive layer and a second active material layer formed on the second conductive layer.

[0119] An active material layer 220 is provided on at least a portion of a surface of the substrate 210. Accordingly, another portion of the substrate 210 may be exposed to the outside without being covered by the active material layer 220. For example, a first conductive layer and a second conductive layer may be exposed to the outside. The exposed regions of the substrate 210 provide space for electrical connection to the outside.

[0120] As described above, the first conductive layer and the second conductive layer are insulated from each other by the insulating layer 210p. Accordingly, the first conductive layer and the second conductive layer are electrically connected, such that the currents on the two conductive layers 210m can be combined.

[0121] Connecting tab 240 is electrically connected to conductive layer 210m. In one embodiment, for example, connecting tab 240 is soldered to conductive layer 210m and connected via solder portion 240w.

[0122] The weld portion 240w is, for example, the area where the connecting tab 240 and the substrate 210 are welded and joined. In one embodiment, the weld portion 240w is, for example, the area where two connecting tabs 240 are welded and joined. Accordingly, for example, the weld portion 240w may be formed by extending from the area provided by the connecting tabs 240 on two or opposite surfaces of the substrate 210 to the area where only the connecting tabs 240 intersect.

[0123] For example, the connecting tab 240 electrically connects the first conductive layer and the second conductive layer. For example, the connecting tab 240 includes a first connecting tab connected to one side of the first conductive layer and a second connecting tab connected to one side of the second conductive layer. The first connecting tab is connected to the first conductive layer on one side and contacts the second connecting tab on the other side. Similarly, the second connecting tab is connected to the second conductive layer on one side and contacts the first connecting tab on the other side. Accordingly, as... Figure 5 As illustrated, the first connecting piece and the second connecting piece are in contact, and the connecting piece 240 is electrically connected to the first conductive layer and the second conductive layer.

[0124] Therefore, the connecting piece 240 includes a conductive material. For example, the connecting piece 240 may include the same or similar material as the conductive layer 210m.

[0125] In one embodiment, electrode 200 may further include a protective layer 230. The protective layer 230 may be formed between the active material layer 220 and the connecting tab 240. The protective layer 230 may prevent or substantially prevent deformation of the conductive layer 210m and / or cracking in the conductive layer 210m.

[0126] The protective layer 230 may comprise any suitable insulating material. Insulating materials include, for example, aluminum oxide, aluminum hydroxide, etc. In one embodiment, the protective layer 230 may further comprise an adhesive.

[0127] With this configuration, the substrate 210 can present a structure that enables electrical connections between conductive layers 210m while reducing weight.

[0128] Figure 6 The figures are for comparison of an example of a lead patch for an electrode attached to a common substrate and an example of a lead patch for an electrode attached to a composite substrate.

[0129] exist Figure 6 In this context, 200' represents a conventional electrode. Conventional electrodes are electrodes used on ordinary substrates.

[0130] The conventional electrode 200' includes a substrate 210' and an active material layer 220' provided on a portion of the substrate 210'. The substrate 210' may be made of a conductive material. The conventional electrode 200' may be electrically connected to a lead patch 250. The lead patch 250 may, for example, be soldered to the substrate 210' and connected to the substrate 210' via a solder portion 250w. In this document, for the purpose of distinguishing it from the composite substrate 210, the substrate 210' used for the conventional electrode 200' is referred to as a conventional substrate.

[0131] exist Figure 6 In the text, 200 indicates a composite substrate (e.g., including those related to...). Figures 3 to 5 The electrode 200 is applied to the composite substrate 210 described herein. The electrode 200 includes an insulating layer 210p, a conductive layer 210m provided on at least one surface of the insulating layer 210p, and a connecting tab 240 electrically connected to the conductive layer 210m. The electrode 200 can be electrically connected to a lead tab 250. For electrical connection to the electrode 200, the lead tab 250 can be soldered to the connecting tab 240 and connected to the substrate 210 via a solder portion 250w.

[0132] like Figure 6 As illustrated, in the electrode 200 to which the composite substrate 210 is applied, the lead terminal 250 is attached to the connecting terminal 240 positioned relatively far from the active material layer 220. This is to prevent the formed solder joint 250w from joining the connecting terminal 240 and the substrate 210.

[0133] According to this configuration, the electrode 200 to which the composite substrate 210 is applied has an increased bending length. For example, as Figure 6 As illustrated, the electrode 200 on which the composite substrate 210 is applied is formed with a bending length d1 that is longer than that of the conventional electrode 200' on which the ordinary substrate 210' is applied. However, in this case, as the bending length increases, the electrode 200 on which the composite substrate 210 is applied may be difficult to apply to a thin-film battery cell.

[0134] Therefore, measures need to be taken to address this through application. Figure 3 The composite substrate 210 described herein reduces the bending length to expand the application range of suitable thin-film battery cells. These measures are described in further detail herein.

[0135] Figure 7 A top view showing the electrodes to which the composite substrate is applied according to an embodiment of the present invention.

[0136] Figure 8A and Figure 8B respectively along Figure 7 The cross-sectional view shown is taken from lines B-B' and C-C'.

[0137] exist Figures 7 to 8B In the figure, 300 represents an electrode according to an embodiment of the present invention. Figure 8A Show along Figure 7 A cross-sectional view of electrode 300 taken from line B-B'; and Figure 8B Show along Figure 7 A cross-sectional view of electrode 300 taken from line C-C'.

[0138] An electrode 300 according to an embodiment of the present invention includes a substrate 310, an active material layer 320, and a connecting piece 340.

[0139] The substrate 310 includes, for example, regarding Figures 3 to 6 The composite substrate 210 described.

[0140] The substrate 310 includes an insulating layer 310p (e.g., including about Figures 3 to 6 The described insulating layer 210p) and the conductive layer 310m formed on at least one surface of the insulating layer 310p (e.g., including regarding the insulating layer 210p) and the conductive layer 310m formed on at least one surface of the insulating layer 310p. Figures 3 to 6 The described conductive layer 210m).

[0141] The insulating layer 310p allows the shape of the substrate 310 to be supported. For example, even if the conductive layer 310m is formed thin, the insulating layer 310p can still allow the substrate 310 to maintain its shape.

[0142] In one embodiment, the insulating layer 310p comprises a material having a lower density than the conductive layer 310m. Therefore, the insulating layer 310p can achieve a weight reduction compared to if the substrate 310 consists only of the conductive layer 310m. For example, the insulating layer 310p comprises an insulating material.

[0143] In one embodiment, the insulating material includes at least one selected from the group consisting of polymeric materials and polymeric composite materials.

[0144] The conductive layer 310m conducts and / or collects current in the substrate 310. Thus, the conductive layer 310m provides a path for electrons to move to the active material layer 320. Accordingly, the conductive layer 310m comprises a conductive material.

[0145] In one embodiment, the conductive material is at least one selected from the group consisting of metallic materials, carbon-based materials, and combinations thereof.

[0146] A conductive layer 310m is provided on at least one surface of the insulating layer 310p. In one embodiment, for example, the conductive layer 310m may be formed on one surface of the insulating layer 310p. In one embodiment, for example, the conductive layer 310m may be formed on two or opposite surfaces of the insulating layer 310p. For example, the conductive layer 310m may include a first conductive layer formed on one surface of the insulating layer 310p and a second conductive layer formed on the other surface of the insulating layer 310p. For example, as... Figure 8A and / or Figure 8B As illustrated, the first conductive layer and the second conductive layer can be insulated from each other by the insulating layer 310p.

[0147] Therefore, the total weight of substrate 310 can be reduced by including an insulating layer 310p that is relatively lighter than the conductive layer 310m. In addition, substrate 310 can help reduce the weight of secondary battery 100.

[0148] Furthermore, the substrate 310 can prevent or substantially prevent other components from penetrating the substrate 310 by including an insulating layer 310p. In one embodiment, the insulating layer 310p has a greater elongation than the conductive layer 310m. Accordingly, in a nail penetration test, the substrate 310 can improve its short-circuit resistance by the elongation of the internal insulating layer 310p. Additionally, the substrate 310 can improve safety by including the insulating layer 310p to increase voltage drop and reduce resistance. In one embodiment, the substrate 310 can improve the safety of the secondary battery 100.

[0149] The active material layer 320 includes, for example, regarding Figures 4 to 6 The active material layer 220 is described.

[0150] An active material layer 320 may be provided on a portion of the substrate 310.

[0151] The active substance layer 320 includes active substances (e.g., including those related to...) Figure 1 and Figure 2 The described active material), conductive material (e.g., including those related to...) Figure 1 and Figure 2 The described conductive material), and / or adhesive (e.g., including those related to...) Figure 1 and Figure 2 (The adhesive described).

[0152] An active material layer 320 is provided on the substrate 310. In one embodiment, for example, the active material layer 320 may be coated on a portion of the substrate 310 in a slurry state. In another embodiment, for example, the active material layer 320 may be attached to a portion of the substrate 310 in a standalone film state.

[0153] An active material layer 320 is provided on a portion of the substrate 310. In one embodiment, for example, the active material layer 320 may be provided on a portion of one surface of the substrate 310. In one embodiment, for example, as... Figure 8A and / or Figure 8B As illustrated, the active material layer 320 may be provided on a portion of two or opposite surfaces of the substrate 310. In one embodiment, if the active material layer 320 is provided on two or opposite surfaces of the substrate 310, the active material layers 320 provided on the two or opposite surfaces of the substrate 310 may be provided symmetrically with respect to each other with respect to the substrate 310 as the center. However, in one embodiment, the active material layer 320 provided on one surface of the substrate 310 and the active material layer 320 provided on the other surface of the substrate 310 may be provided to occupy different areas.

[0154] The active material layer 320 is provided, for example, on the conductive layer 310m. For example, the active material layer 320 includes a first active material layer formed on the first conductive layer and a second active material layer formed on the second conductive layer.

[0155] An active material layer 320 is provided on at least one portion of a surface of the substrate 310. Accordingly, another portion of the substrate 310 may be exposed to the outside without being covered by the active material layer 320. For example, a portion of the first conductive layer and the second conductive layer may be covered by the active material layer 320, while another portion may be exposed to the outside. The exposed portion of the substrate 310 provides space for electrical connection to the outside.

[0156] As described above, the first conductive layer and the second conductive layer are insulated from each other by the insulating layer 310p. Accordingly, the first conductive layer and the second conductive layer are electrically connected, such that the currents on the two conductive layers 310m can be combined.

[0157] Connecting tab 340 is electrically connected to conductive layer 310m. In one embodiment, for example, connecting tab 340 is soldered to conductive layer 310m and connected via solder portion 350w.

[0158] For example, the connecting tab 340 is electrically connected to the first conductive layer and the second conductive layer. For example, the connecting tab 340 includes a first connecting tab connected to one side of the first conductive layer and a second connecting tab connected to one side of the second conductive layer. The first connecting tab is connected to the first conductive layer on one side and contacts the second connecting tab on the other side. Similarly, the second connecting tab is connected to the second conductive layer on one side and contacts the first connecting tab on the other side. Accordingly, as... Figure 8A and / or Figure 8B As illustrated, the first connecting piece and the second connecting piece are in contact, and the connecting piece 340 is electrically connected to the first conductive layer and the second conductive layer.

[0159] Therefore, the connecting piece 340 includes a conductive material. For example, the connecting piece 340 may include the same or similar material as the conductive layer 310m.

[0160] In one embodiment, electrode 300 may further include a protective layer 330. The protective layer 330 may be formed between the active material layer 320 and the connecting tab 340. The protective layer 330 may prevent or substantially prevent deformation of the conductive layer 310m and / or cracking in the conductive layer 310m.

[0161] The protective layer 330 may include any suitable insulating material. In one embodiment, the insulating material includes, for example, aluminum oxide, aluminum hydroxide, etc. In one embodiment, the protective layer 330 may further include an adhesive.

[0162] An electrode 300 according to an embodiment of the present invention includes features for avoiding [further details regarding the electrode]. Figure 6 The problem is described in the substrate terminal block area.

[0163] Before describing the substrate contact area, the shape of a substrate 310 according to an embodiment of the present invention will be described by way of example. As described above, an active material layer 320 is formed on a portion of the substrate 310, and another portion of the substrate 310 is exposed to the outside.

[0164] When Figure 7 When viewed from above, another portion of the substrate 310 may be formed with a width different from that of a portion of the substrate 310. For ease of explanation, the portion of the substrate 310 on which the active material layer 320 is provided is referred to as the coated portion, and the other portion of the substrate 310 on which the active material layer 320 is not provided is referred to as the uncoated portion.

[0165] For example, the uncoated portion is formed by extending from the coated portion in a direction away from the active material layer 320. In one embodiment, the uncoated portion may be formed by partially slotting. Accordingly, when viewed from above, the total width of the uncoated portion is less than the width of the coated portion.

[0166] In one embodiment, for example, the uncoated portion is formed by slotting into a shape that protrudes from the coated portion in a direction away from the active material layer 320. For example, the uncoated portion may be formed into one or more shapes that protrude from the coated portion.

[0167] Accordingly, the connecting tab 340 may form or define a substrate tab region by surrounding another portion of the substrate 310. The connecting tab 340 may form or define a substrate tab region by surrounding the substrate 310 and its surrounding area. In one embodiment, the substrate tab region may extend in a direction away from the active material layer 320.

[0168] That is, the substrate terminal block region includes a region surrounded by the connecting terminal block 340, which includes not only the uncoated portion but also the area surrounding the uncoated portion. Accordingly, the substrate terminal block region may include a mixed region 311 and a single region 312. A further detailed description of the substrate terminal block region is provided below.

[0169] like Figure 7 and Figure 8A As shown, the mixing region 311 includes a substrate 310 and a connecting piece 340. That is, the mixing region 311 can be formed as a connecting piece 340 surrounding another part of the substrate 310.

[0170] The connecting tab 340 includes, for example, a first connecting tab 341 surrounding one surface of the substrate 310 and a second connecting tab 342 surrounding the other surface of the substrate 310. The first connecting tab 341 and the second connecting tab 342 can be connected to one side of the substrate 310. That is, the first connecting tab 341 and the second connecting tab 342 can be a single connecting tab 340.

[0171] Accordingly, for example, the hybrid region 311 may include a substrate 310, a first connecting tab 341, and a second connecting tab 342. For example, the hybrid region 311 may include a substrate 310, a first connecting tab 341 provided on one surface of the substrate 310, and a second connecting tab 342 provided on another surface of the substrate 310. In one embodiment, the first connecting tab 341 may define one surface of the substrate tab region, and the second connecting tab 342 may define the other surface of the substrate tab region.

[0172] like Figure 7 and Figure 8B As shown, a single region 312 includes a connecting tab 340. That is, the single region 312 can be formed as a connecting tab 340 surrounding the periphery of the substrate 310.

[0173] Accordingly, for example, a single region 312 may include a first connecting piece 341 and a second connecting piece 342. For example, a single region 312 may be formed when the first connecting piece 341 and the second connecting piece 342 are in contact.

[0174] In this manner, an electrode 300 according to an embodiment of the present invention includes a substrate tab region having a mixed region 311 and a single region 312. This allows the electrode 300 to expand the range of the area in which the lead tab can be soldered to the electrode 300. For example, the electrode 300 can be soldered such that the lead tab is closer to the active material layer 320, thereby reducing the bending length.

[0175] However, the shape of the electrode 300 according to the present invention is not limited to... Figures 7 to 8B The shape of electrode 300 is illustrated. That is, electrode 300 includes all types of electrodes including substrate tab regions. Therefore, through... Figures 7 to 15 The electrode 300 described is merely an example included in various embodiments of the present invention.

[0176] For example, an electrode 300 according to an embodiment of the present invention includes a substrate patch region. The substrate patch region includes a mixed region 311 and a single region 312.

[0177] In one embodiment, such as Figures 7 to 8B As shown, the mixing region 311 may include a first mixing region 311a and a second mixing region 311b. One side of the first mixing region 311a is positioned close to the active material layer 320, and the other side of the first mixing region 311a is positioned away from the active material layer 320. One side of the second mixing region 311b is positioned close to the active material layer 320, and the other side of the second mixing region 311b is positioned away from the active material layer 320. In one embodiment, the first mixing region 311a and the second mixing region 311b are positioned spaced apart from each other.

[0178] like Figures 7 to 8B As shown, a single region 312 may be formed on one side of the first mixing region 311a. Additionally, a single region 312 may be formed on one side of the second mixing region 311b. Furthermore, a single region 312 may be formed between the first mixing region 311a and the second mixing region 311b.

[0179] In one embodiment, with Figures 7 to 8B As shown in the diagram, a single region 312 may be formed on the other side of the first mixed region 311a and / or the other side of the second mixed region 311b.

[0180] With this structure, the electrode 300 according to an embodiment of the present invention can provide a wider area for attaching lead terminals. Regarding Figure 9 Describe an example.

[0181] Figure 9 The figures are for comparison of an example of a lead patch attached to an electrode applied to a composite substrate and an example of a lead patch attached to an electrode applied to a composite substrate according to an embodiment of the present invention.

[0182] exist Figure 9 In the middle, 200 indicates about Figures 3 to 5 The composite substrate 210 described is used in the electrode.

[0183] Electrode 200 includes an insulating layer 210p, a conductive layer 210m provided on at least one surface of the insulating layer 210p, and a connecting tab 240 electrically connected to the conductive layer 210m. Electrode 200 can be electrically connected to lead tab 250. For electrical connection to electrode 200, lead tab 250 can be soldered to connecting tab 240 and connected to substrate 210 via solder portion 250w.

[0184] exist Figure 9 In the middle, 300 indicates that according to the relevant information... Figures 7 to 8B An electrode according to an embodiment of the present invention is described.

[0185] Electrode 300 includes an insulating layer 310p, a conductive layer 310m provided on at least one surface of the insulating layer 310p, and a connecting tab 340 surrounding the composite substrate 310 and forming a substrate tab region. Electrode 300 is electrically connectable to lead tab 350. For electrical connection to electrode 300, lead tab 350 can be soldered to connecting tab 340 and connected to substrate 310 via solder portion 350w.

[0186] like Figure 9 As illustrated, in electrode 200, lead terminal 250 is attached to connection terminal 240 positioned relatively far from active material layer 220.

[0187] On the other hand, such as Figure 9 As illustrated, in electrode 300, lead tab 350 is attached to connecting tab 340 positioned relatively close to active material layer 320. This is because the area where lead tab 350 can be attached to electrode 300 has been expanded by the substrate tab area. For example, mixed region 311 allows substrate 310 and connecting tab 340 to be welded over a relatively wide area. Accordingly, mixed region 311 can improve the weld strength between substrate 310 and connecting tab 340. Additionally, for example, single region 312 can ensure a relatively wide area where lead tab 350 can be welded. Accordingly, single region 312 allows secondary battery 100 including electrode 300 and lead tab 350 to have a reduced bending length. For example, single region 312 can reduce bending length d2.

[0188] The lead patch 350 can be welded to the substrate patch area by, for example, ultrasonic welding or laser welding. For example, the lead patch 350 can be welded by forming a single area 312 and a welding portion 350w.

[0189] Figure 10 A top view showing the electrodes to which the composite substrate is applied according to another embodiment of the present invention.

[0190] Figure 11A and Figure 11B respectively along Figure 10 The cross-sectional view shown is taken from lines D-D' and E-E'.

[0191] exist Figures 10 to 11B In the figure, 300 represents an electrode according to an embodiment of the present invention. Figure 11A Show along Figure 10 A cross-sectional view of electrode 300 taken by line D-D'; and Figure 11B Show along Figure 10 A cross-sectional view of electrode 300 taken from line E-E'.

[0192] According to another embodiment of the present invention, the electrode 300 includes a substrate 310, an active material layer 320, and a connecting piece 340.

[0193] The substrate 310 includes, for example, regarding Figures 3 to 6 The composite substrate 210 described or related to Figures 7 to 9 The substrate 310 described.

[0194] The substrate 310 includes an insulating layer 310p (e.g., including about Figures 3 to 6 The description of the insulating layer 210p and about Figures 7 to 9 The described insulating layer 310p) and the conductive layer 310m formed on at least one surface of the insulating layer 310p (e.g., including regarding the insulating layer 310p). Figures 3 to 6 The described conductive layer 210m and about Figures 7 to 9 The described conductive layer is 310m.

[0195] The active material layer 320 includes, for example, regarding Figures 3 to 6 The active substance layer 220 described or about Figures 7 to 9 The active material layer 320 is described.

[0196] An active material layer 320 is provided on at least a portion of a surface of a substrate 310.

[0197] The connecting tab 340 can form a substrate tab region by surrounding another portion of the substrate 310. The connecting tab 340 can form a substrate tab region by surrounding the substrate 310 and the area surrounding the substrate 310.

[0198] The substrate terminal block area may include a mixed area 311 and a single area 312.

[0199] In one embodiment, a single region 312 includes a body 312a and a wing 312b. The body 312a corresponds to, for example, regarding... Figures 7 to 9 The single region 312 is described. The body 312a is formed to extend in a direction away from the active material layer 320. The wing 312b is formed to protrude from at least one side of the body 312a.

[0200] The mixing region 311 is formed by extending from the active material layer 320 toward the single region 312. For example, the mixing region 311 is formed by extending from the active material layer 320 toward the wing 312b.

[0201] In one embodiment, a single region 312 is a region formed by connecting tabs 340, and the size and shape of the body 312a and wing 312b may be set by the size and / or shape of the substrate 310 included in the mixed region 311.

[0202] For example, such as Figure 10 As illustrated, the mixing region 311 may include a first mixing region 311a and a second mixing region 311b formed spaced apart from each other. The first mixing region 311a and the second mixing region 311b may be formed by extending a distance (e.g., a predetermined distance) from the active material layer 320. This distance (e.g., the predetermined distance) may be the minimum distance required between the first mixing region 311a and the second mixing region 311b.

[0203] Accordingly, the mixing region 311 can be formed as a ratio Figures 7 to 8B The mixing region 311 described in the text is relatively narrow.

[0204] Accordingly, the connecting piece 340 may be formed to surround not only the side surface of the substrate 310, but also the front surface of the substrate 310. Correspondingly, when the connecting piece 340 surrounds a region formed on the side surface of the first mixing region 311a and the second mixing region 311b, or surrounds a region extending therefrom, this region may be formed as a body 312a. Additionally, when the connecting piece 340 surrounds a region formed in front of the first mixing region 311a and / or the second mixing region 311b, this region may be formed as a wing 312b.

[0205] Figure 10The illustration shows an electrode 300 according to an embodiment of the invention comprising two mixing regions. However, the electrode 300 may include one mixing region 311, or it may include, for example, three mixing regions formed spaced apart from each other. For example, if the electrode 300 includes one mixing region, then a single region 312 may include a body and a wing. For example, a single region 312 may include two bodies and a wing formed between the two bodies. For example, if the electrode 300 includes three mixing regions, then a single region 312 may include two bodies and three wings, and the three wings may be located outside each of the two bodies and between the two bodies.

[0206] The mixing region 311 may be formed, for example, by extending a distance (e.g., a predetermined distance) or more from the active material layer 320 toward the single region 312. In one embodiment, this distance (e.g., a predetermined distance) is the minimum distance between the connecting tab 340 and the substrate 310 to ensure solder strength. In one embodiment, this distance (e.g., a predetermined distance) is, for example, 1.0 mm or greater. In one embodiment, this distance (e.g., a predetermined distance) is, for example, 1.1 mm or greater. In one embodiment, this distance (e.g., a predetermined distance) is, for example, 1.2 mm or greater. In one embodiment, this distance (e.g., a predetermined distance) is, for example, 1.3 mm or greater. In one embodiment, this distance (e.g., a predetermined distance) is, for example, 1.4 mm or greater. In one embodiment, this distance (e.g., a predetermined distance) is, for example, 1.5 mm or greater. If the distances above are exceeded, the solder strength between the connecting tab 340 and the substrate 310 may weaken, resulting in the connecting tab 340 separating from the substrate 310. Therefore, in one embodiment, the mixing region 311 is formed by extending by a distance (e.g., a predetermined distance) or more.

[0207] Figure 12 A top view illustrating an example of a lead-attached tab to an electrode according to another embodiment of the invention.

[0208] exist Figure 12 In the middle, 300 indicates that according to the relevant information... Figure 10 , Figure 11A and Figure 11B The electrode of another embodiment of the present invention is described.

[0209] Electrode 300 includes an insulating layer 310p, a conductive layer 310m provided on at least one surface of the insulating layer 310p, and a connecting tab 340 surrounding the substrate 310 and forming a substrate tab region. Electrode 300 is electrically connectable to lead tab 350. In one embodiment, for electrical connection to electrode 300, lead tab 350 may be soldered to connecting tab 340 and connected to substrate 310 via solder portion 350w.

[0210] like Figure 12 As shown, electrode 300 forms a single region 312 with a relatively wide area. Correspondingly, lead tab 350 may have a relatively wide area that can be soldered to electrode 300.

[0211] Accordingly, the electrode 300 according to an embodiment of the present invention can improve the welding strength with the lead terminal 350. In addition, the electrode 300 can further contribute to reducing the weight of the secondary battery 100 by further reducing the weight of the substrate 310.

[0212] Figure 13 A top view showing the electrodes to which the composite substrate is applied according to another embodiment of the present invention.

[0213] Figure 14A and Figure 14B respectively along Figure 13 The cross-sectional view taken by lines F-F' and G-G' is shown in the figure.

[0214] exist Figures 13 to 14B In the figure, 300 represents an electrode according to another embodiment of the present invention. Figure 14A Show along Figure 13 A cross-sectional view of electrode 300 taken by line F-F'; and Figure 14B Show along Figure 13 A cross-sectional view of electrode 300 taken from line G-G'.

[0215] According to another embodiment of the present invention, the electrode 300 includes a substrate 310, an active material layer 320, and a connecting piece 340.

[0216] The substrate 310 includes, for example, regarding Figures 3 to 6 The composite substrate 210 described or related to Figures 7 to 12 The substrate 310 described.

[0217] The substrate 310 includes an insulating layer 310p (e.g., including about Figures 3 to 6 The description of the insulating layer 210p and about Figures 7 to 12 The described insulating layer 310p) and the conductive layer 310m formed on at least one surface of the insulating layer 310p (e.g., including regarding the insulating layer 310p). Figures 3 to 6 The described conductive layer 210m and about Figures 7 to 12 The described conductive layer is 310m.

[0218] The active material layer 320 includes, for example, regarding Figures 3 to 6 The active substance layer 220 described or about Figures 7 to 12 The active material layer 320 is described.

[0219] An active material layer 320 is provided on at least a portion of a surface of a substrate 310.

[0220] The connecting tab 340 can form a substrate tab region by surrounding another portion of the substrate 310. The connecting tab 340 can form a substrate tab region by surrounding the substrate 310 and the area surrounding the substrate 310.

[0221] The substrate terminal block area may include a mixed area 311 and a single area 312.

[0222] In one embodiment, a single region 312 includes a first single region 312a and a second single region 312b formed spaced apart from the first single region 312a. In another embodiment, a mixed region 311 is formed between the first single region 312a and the second single region 312b.

[0223] With this structure, the electrode 300 according to an embodiment of the present invention enables the substrate 310 and the connecting piece 340 to have stable welding strength.

[0224] Figure 15 A top view illustrating an example of a lead-attached tab to an electrode according to another embodiment of the invention.

[0225] exist Figure 15 In the middle, 300 indicates that according to Figure 13 , Figure 14A and Figure 14B The electrode of one embodiment of the present invention described herein.

[0226] Electrode 300 includes an insulating layer 310p, a conductive layer 310m provided on at least one surface of the insulating layer 310p, and a connecting tab 340 surrounding the composite substrate 310 and forming a substrate tab region. Electrode 300 is electrically connectable to lead tab 350. In one embodiment, for electrical connection to electrode 300, lead tab 350 may be soldered to connecting tab 340 and connected to substrate 310 via solder portion 350w.

[0227] In one embodiment, such as Figure 15 As illustrated, electrode 300 forms a single region 312 on two or opposite edge sides of the substrate tab region. Accordingly, lead tab 350 can be soldered by forming a solder portion 350w on the area where the center of lead tab 350 overlaps with the single region 312. In one embodiment, with... Figure 15As shown, the lead patch 350 can be soldered via an 11-shaped solder joint, in which the solder portions are spaced apart from each other between the edge of the lead patch 350 and the single region 312. In this way, the lead patch 350 can be electrically connected to the substrate 310 even when bonded on the mixed region 311 via the single region 312. Accordingly, the electrode 300 can provide a more flexible area to which the lead patch 350 can be soldered.

[0228] Accordingly, the electrode 300 according to an embodiment of the present invention can improve the welding strength with the lead terminal 350. In addition, the electrode 300 can further contribute to reducing the weight of the secondary battery 100 by further reducing the weight of the substrate 310.

[0229] In one embodiment, a secondary battery (100, see embodiment of the present invention) is used. Figure 1 and Figure 2 ) includes electrode assembly (40, see Figure 1 and Figure 2 ) and a housing that accommodates the electrode assembly 40.

[0230] Electrode assembly 40 includes electrode 300. Electrode 300 includes negative electrode 20 and / or positive electrode 10. Electrode 300 includes substrate 310 (e.g., including...). Figures 3 to 6 substrate 210 and Figures 7 to 15 The substrate 310), the active material layer 320 (e.g., including...) Figures 4 to 6 The active material layer 220 and Figures 7 to 15 The active material layer 320) and the connecting piece 340 (e.g., including the ... connecting piece 340 Figures 4 to 6 Connecting terminal 240 and Figures 7 to 15 (Connecting piece 340).

[0231] Additionally, the secondary battery 100 may further include lead terminals 350 (e.g., including...). Figure 9 , Figure 12 and Figure 15 The lead terminal 350 is electrically connected to the connecting terminal 340 and has at least a portion exposed outside the housing.

[0232] According to embodiments of the present invention, weight-reduced electrodes and / or secondary batteries can be provided.

[0233] According to embodiments of the present invention, electrodes and / or secondary batteries comprising a composite substrate capable of effective electrical connection can be provided.

[0234] According to embodiments of the present invention, electrodes and / or secondary batteries having reduced bending lengths in the substrate terminal area can be provided.

[0235] According to embodiments of the present invention, electrodes and / or secondary batteries that can extend the application scope to thin-film battery cells can be provided.

[0236] However, the aspects and effects that can be obtained by the present invention are not limited to those described above, and those skilled in the art will clearly understand from the description of the present invention other technical aspects and effects not mentioned.

[0237] Although the invention has been described above with reference to some exemplary embodiments and figures, the invention is not limited thereto, and those skilled in the art can make various modifications and variations within the scope of the technical concept and the equivalents of the claims.

Claims

1. An electrode comprising: a substrate; an active material layer on a portion of the substrate; and a connection tab defining a substrate tab area by surrounding another portion of the substrate.

2. The electrode according to claim 1, wherein: the substrate comprises: an insulating layer; and a conductive layer comprising a first conductive layer on one surface of the insulating layer and a second conductive layer on another surface of the insulating layer; and the connection tab electrically connects the first conductive layer and the second conductive layer.

3. The electrode according to claim 2, wherein the connection tab comprises a same material as a material of the conductive layer.

4. The electrode according to claim 1, wherein the substrate tab area extends in a direction away from the active material layer.

5. The electrode according to claim 1, wherein the substrate tab area comprises: a mixed area comprising the substrate and the connection tab; and a single area comprising the connection tab.

6. The electrode according to claim 5, wherein the mixed area comprises: the substrate; a first connection tab on one surface of the substrate and defining one surface of the substrate tab area; and a second connection tab on another surface of the substrate and defining another surface of the substrate tab area.

7. The electrode according to claim 5, wherein the single area is formed by contacting a first connection tab formed on one surface of the substrate with a second connection tab formed on another surface of the substrate.

8. The electrode according to claim 5, wherein: the mixed area comprises: a first mixed area; and a second mixed area spaced apart from the first mixed area, and the single area is between the first mixed area and the second mixed area.

9. The electrode according to claim 5, wherein: the single area comprises: a main body; and a wing protruding from at least one side of the main body; and the mixed area extends from the active material layer toward the single area.

10. The electrode according to claim 5, wherein: the single area comprises: a first single area; and a second single area spaced apart from the first single area, and the mixed area is between the first single area and the second single area.

11. A secondary battery comprising: an electrode assembly comprising the electrode according to any one of claims 1 to 10; and a case accommodating the electrode assembly.

12. The secondary battery according to claim 11, further comprising a lead tab electrically connected to the connection tab and having at least a portion exposed to an outside of the case. ​ ​ ​ ​

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