WO2024005532A1 - 전극 조립체, 이차 전지, 배터리 팩 및 자동차 - Google Patents
전극 조립체, 이차 전지, 배터리 팩 및 자동차 Download PDFInfo
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- WO2024005532A1 WO2024005532A1 PCT/KR2023/009006 KR2023009006W WO2024005532A1 WO 2024005532 A1 WO2024005532 A1 WO 2024005532A1 KR 2023009006 W KR2023009006 W KR 2023009006W WO 2024005532 A1 WO2024005532 A1 WO 2024005532A1
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- Prior art keywords
- electrode
- electrode assembly
- active material
- thickness
- material layer
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/595—Tapes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to electrode assemblies, secondary batteries, battery packs, and automobiles.
- This application claims the benefit of the filing date of Korean Patent Application No. 10-2022-0078696 filed with the Korean Intellectual Property Office on June 28, 2022, the entire contents of which are included in this specification.
- Secondary batteries which are easy to apply depending on the product group and have electrical characteristics such as high energy density, are used not only in portable devices but also in electric vehicles (EV, Electric Vehicle) and hybrid vehicles (HEV, Hybrid Electric Vehicle) that are driven by an electrical drive source. It is universally applied.
- EV Electric Vehicle
- HEV Hybrid Electric Vehicle
- Types of secondary batteries currently widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, and nickel zinc batteries.
- the operating voltage of these unit secondary battery cells is approximately 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack may be formed by connecting a plurality of secondary batteries in series. Additionally, a battery pack may be constructed by connecting multiple secondary batteries in parallel depending on the charge/discharge capacity required for the battery pack. Accordingly, the number of secondary batteries included in the battery pack and the type of electrical connection can be set in various ways depending on the required output voltage and/or charge/discharge capacity.
- the present invention seeks to provide an electrode assembly and secondary battery capable of realizing high energy density by providing a thickness buffer in the outermost empty space of the electrode assembly.
- Another object of the present invention is to provide a battery pack including a secondary battery having the above improved structure and a vehicle including the same.
- One embodiment of the present invention is an electrode assembly in which a first electrode, a separator, and a second electrode are stacked and wound, and the outermost part of the electrode assembly covers the end of the second electrode with the first electrode interposed between the separator and the second electrode.
- An electrode assembly comprising an empty space and a thickness buffer provided in the empty space is provided.
- Another embodiment of the present invention provides a secondary battery including an electrode assembly according to the above-described embodiment.
- Another embodiment of the present invention provides a battery pack including a secondary battery according to the above-described embodiment.
- Another embodiment of the present invention provides a vehicle including a battery pack according to the above-described embodiment.
- the thickness of the current collector becomes thinner to increase the energy density of the electrode, and the electrode active material layer coated on the current collector becomes thinner. The thickness becomes even thicker.
- Figure 1 is a diagram schematically showing a form in which a first electrode and a second electrode face each other at the outermost part of an existing electrode assembly according to a comparative example of the present invention.
- Figure 2 is a photograph showing a case where a crack occurs due to an empty space formed on one side of the first electrode at the outermost part of the existing electrode assembly according to a comparative example of the present invention.
- FIG. 3 (a) is a diagram showing the electrode assembly according to FIG. 1, and (b) is a diagram showing the electrode assembly according to an embodiment of the present invention.
- FIG. 4 is a diagram schematically showing a first electrode and a second electrode facing each other at the outermost part of an electrode assembly according to an embodiment of the present invention.
- Figure 5 shows an electrode assembly according to an embodiment of the present invention, (a) is a front view and (b) is a top view.
- 6 to 8 are plan views schematically showing a first electrode and a second electrode of an electrode assembly according to an embodiment of the present invention.
- FIG. 9 is a diagram illustrating a schematic configuration of a battery pack including secondary batteries according to an embodiment of the present invention.
- Figure 10 is a diagram showing the schematic configuration of a vehicle including a battery pack according to an embodiment of the present invention.
- ... unit used in the specification refers to a unit that processes at least one function or operation.
- One embodiment of the present invention is an electrode assembly 111 in which a first electrode 100, a separator, and a second electrode 200 are stacked and wound, and the outermost portion 211 of the electrode assembly is the first electrode ( Electrode assembly 111 wherein 100 includes an empty space 400 covering the end 250 of the second electrode through the separator and a thickness buffer 500 provided in the empty space 400. ) is provided.
- the first electrode 100 may be a cathode, and the second electrode 200 may be an anode.
- the occurrence of cracks due to the empty space 400 can be prevented, and the cracks that may occur due to this can be prevented. Safety problems can be resolved.
- Figure 1 is a diagram schematically showing the form in which the first electrode 10 and the second electrode 20 face each other at the outermost part 2 of the existing electrode assembly according to a comparative example of the present invention
- Figure 2 is a diagram showing the form where the first electrode 10 and the second electrode 20 face each other, according to the comparative example of the present invention.
- This is a photograph showing a case where a crack occurred due to an empty space formed on one side of the first electrode at the outermost part of the existing electrode assembly according to the comparative example of .
- an empty space 40 may be created by covering the end of the second electrode 20 coated with a thick electrode active material layer with the first electrode 10.
- the empty space 40 may be formed on one side of the first electrode 10 facing the end of the second electrode 20 through a separator.
- the empty space 40 may be formed in an active material layer or uncoated area provided on the current collector on one side of the first electrode 10 facing the end of the second electrode 20, and may be formed by repeating charging and discharging of the electrode assembly. In this case, stress is concentrated in the active material layer or uncoated area, and cracks may easily occur.
- the fact that the second electrode 200 has a free edge means that the end of the current collector 210 and the ends of the electrode active material layers 220 and 230 in the second electrode match.
- an uncoated area may not be formed at the end 250 of the second electrode.
- the second electrode 200 may have a middle tab structure, and the middle tab structure includes the second electrode tabs 240 provided on parts other than both ends in the direction (P) perpendicular to the winding axis of the electrode assembly. It means to include more. Accordingly, both ends of the electrode assembly in the direction P perpendicular to the winding axis may have free edges on which no uncoated area is formed. (Refer to FIGS. 6 to 8 to be described later)
- Figure 3 (a) is a front view showing the first electrode 10 and the second electrode 20 at the outermost part 2 of the electrode assembly according to a comparative example of the present invention
- Figure 3 (b) is a front view showing the first electrode 10 and the second electrode 20. This is a front view showing the first electrode 100 and the second electrode 200 at the outermost part 211 of the electrode assembly according to an embodiment of the invention.
- the electrode assembly (1, 111) includes first electrodes (10, 100), a separator (not shown), and second electrodes (20, 200).
- the electrode assemblies 1 and 111 may be formed by stacking and winding the first electrodes 10 and 100, a separator (not shown), and the second electrodes 20 and 200.
- the separator not shown
- the electrode consisting of the first electrodes 10, 100 and the second electrodes 20, 200 is shown. It is also possible that two or more unit cells are wound.
- An empty space 40 may be created by covering the end 25 of the second electrode coated with a thick electrode active material layer in the portion 2 with the first electrode 10.
- stress may be concentrated in the empty space 40 formed on one side of the first electrode facing the second electrode end 25, resulting in cracks C.
- the empty space 40 formed on one side of the first electrode may be formed on one side of the first electrode active material layer 13 or the first electrode uncoated region 15 provided on the first electrode current collector 11, When charging and discharging the electrode assembly 1 is repeated, stress is concentrated in the first electrode active material layer 13 or the first electrode uncoated region 15, and cracks C may easily occur.
- FIG. 4 is a diagram schematically showing the first electrode 100 and the second electrode 200 facing each other at the outermost portion 211 of the electrode assembly according to an embodiment of the present invention.
- Figure 5 shows an electrode assembly 111 according to an embodiment of the present invention, where (a) is a front view and (b) is a top view.
- the electrode assembly 111 has a jelly roll structure in which the first electrode 100, a separator (not shown), and the second electrode 200 are stacked and wound. may have, and the electrode assembly 111 may be wound in a circular or oval shape.
- the outermost part 211 of the electrode assembly may be provided at the end of the winding of the wound electrode assembly and may be the part furthest from the winding axis direction.
- An empty space 400 may be formed on one side of the first electrode 100 of the outermost part 211 of the electrode assembly, covering the end 250 of the second electrode with the separator interposed, which has a thickness of It may include a buffer unit 500.
- the first electrode 100 includes a first electrode current collector 110 and a first electrode active material layer 130 provided on the first electrode current collector 110, and the thickness
- the buffer portion 500 is provided directly or through the separator on the surface opposite to the winding center of the first electrode between the end 250 of the second electrode and the end of the first electrode active material layer 130.
- the thickness buffer 500 is not limited to the length from the end 250 of the second electrode to the end of the first electrode active material layer 130.
- the thickness buffer 500 is the length of the first electrode active material layer 130. It may be provided directly on the surface opposite to the winding center of the first electrode between the first electrode uncoated portions 150 beyond the end of the first electrode active material layer 130 or through the separator.
- the thickness buffer 500 may be provided with a length of 50% or more of the length between the end 250 of the second electrode and the end of the first electrode active material layer 130.
- the thickness buffer 500 is 50% or more, 55% or more, 60% or more, 65% or more compared to the length between the end 250 of the second electrode and the end of the first electrode active material layer 130. It may be more than 70%.
- the thickness buffer portion 500 may be 100% or less, 95% or less, or 90% or less of the length between the end 250 of the second electrode and the end of the first electrode active material layer 130.
- the thickness buffer 500 is provided in the empty space 400 formed in the outermost part 211 of the electrode assembly, thereby preventing cracks from occurring due to the empty space 400.
- the thickness buffer part is provided with a thickness less than or equal to the thickness of the end of the second electrode.
- the thickness T2 of the thickness buffer may be 70% to 100% of 100% of the thickness T1 of the end of the second electrode.
- the thickness buffer 500 does not overlap the end 250 of the second electrode, and the thickness buffer 500 has a gap of 3 mm or less from the end 250 of the second electrode. It may be provided separated from (I).
- the empty space 400 formed in the outermost portion of the electrode assembly may become large. Therefore, when the electrode assembly 111 is repeatedly charged and discharged, stress may be concentrated in the empty space 400 and cracks may occur.
- the thickness buffer portion is provided with a length of 50% to 100% of 100% of the length of the electrode assembly in the winding axis direction of the electrode assembly.
- the length (HL) of the thickness buffer may be 50% or more, 55% or more, 60% or more, 65% or more, or 70% or more of 100% of the length of the electrode assembly in the winding axis direction (H) of the electrode assembly.
- the length (HL) of the thickness buffer may be 100% or less, 95% or less, 90% or less, 85% or less, or 80% or less of 100% of the length of the electrode assembly in the winding axis direction (H) of the electrode assembly.
- the thickness buffer 500 provided in the empty space 400 formed in the outermost part 211 of the electrode assembly prevents cracks from forming in the empty space 400. can do.
- the second electrode 200 includes a second electrode current collector 210 and second electrode active material layers 220 and 230 provided on the second electrode current collector 210, At the end 250 of the second electrode, the end of the second electrode current collector 210 and the ends of the second electrode active material layers 220 and 230 coincide with each other.
- the fact that the end 250 of the second electrode matches the end of the second electrode current collector 210 and the ends of the second electrode active material layers 220 and 230 means that the end of the second electrode in the electrode assembly 111 This may mean that the end portion 250 has a free edge and that no uncoated portions are formed at both ends of the second electrode 200 in the direction P perpendicular to the winding axis of the electrode assembly.
- the fact that the end of the second electrode current collector 210 and the ends of the second electrode active material layers 220 and 230 coincide means that the end 250 of the second electrode is connected to the second electrode current collector 210 and This means that the lengths of the second electrode active material layers 220 and 230 are the same, and in this case, the length of the second electrode current collector 210 and the length of the second electrode active material layers 220 and 230 are known in the art. It may be within the general error range of For example, the length of the second electrode current collector 210 at the end 250 of the second electrode may be +0.5% or less compared to the length of the second electrode active material layers 220 and 230.
- the end 250 of the second electrode is provided at the winding end of the wound electrode assembly.
- the first electrode 100 may include a first electrode active material layer 120, 130 on at least one surface of the first electrode current collector 110, and the second electrode 200 may include a second electrode current collector ( Second electrode active material layers 220 and 230 may be included on at least one surface of 210).
- the first electrode 100 and the second electrode 200 are not particularly limited, and the first electrode active material or the second electrode active material is formed into the first electrode current collector 110 and the second electrode active material, respectively, according to a common method known in the art. It can be manufactured in a form bound to the two-electrode current collector 210.
- the first electrode 100 is provided with a first electrode active material layer 130 on one surface of the first electrode current collector 110 at the outermost part 211 of the electrode assembly, and is a plain plate not provided with the active material layer. It may include part 15.
- the end 250 of the second electrode may be present in the outermost part 211 of the electrode assembly.
- the end 250 of the second electrode is provided with second electrode active material layers 220 and 230 on both sides of the second electrode current collector 210, respectively, and has a free edge structure that does not include an uncoated region. You can. That is, the end 250 of the second electrode overlaps the end of the current collector 210 and the ends of the electrode active material layers 220 and 230, and has the same length in the direction (P) perpendicular to the winding axis. It may include ends of the two electrode active material layers 220 and 230 and ends of the second electrode current collector 210.
- the first electrode active material layer 130 of the first electrode 100 may face the second electrode active material layer 230 of the second electrode 200 through a separator.
- the first electrode 100 is provided longer in a direction (P) perpendicular to the winding axis than the second electrode 200 facing through the separator, and the first electrode 100
- the first electrode active material layer 130 provided on the surface opposite to the center of the winding is provided longer in the direction (P) perpendicular to the winding axis than the end 250 of the second electrode facing through the separator.
- the first electrode active material layer 130 is provided longer than the end 250 of the second electrode, that is, the second electrode active material layer 230, thereby preventing damage to the separator even when charging the electrode assembly 111. This can prevent a decrease in the lifespan of the battery.
- the first electrode 100 extends longer than the second electrode 200. That is, the end 250 of the second electrode is shorter than the end of the first electrode 100 facing it.
- the first electrode 100 may cover the end 250 of the second electrode through the separator at the outermost portion 211 of the electrode assembly.
- the end 250 of the second electrode may be provided at the end of the winding of the wound electrode assembly and positioned at the outermost part 211 of the electrode assembly.
- an empty space 40 may be formed.
- the empty space 40 may be formed on one or both sides of the first electrode 10 facing the second electrode 20, depending on the thickness T1 of the end of the second electrode. When discharging, stress is concentrated in the empty space 40, which may damage the separator interposed between them or cause a short circuit between both electrodes due to cracks C in the electrodes (see Figures 1 to 3 see a)).
- the outermost part 211 of the electrode assembly is an empty space 400 where the first electrode 100 covers the end 250 of the second electrode through the separator.
- a thickness buffer 500 is provided.
- the thickness buffer 500 can relieve stress concentration in the empty space 400, thereby maintaining the separator between the first electrode 100 and the second electrode 200 and preventing cracks in the electrodes. By preventing (C), the stability of the battery can be ensured.
- the thickness buffer 500 may be provided between a point facing the end 250 of the second electrode and the end of the first electrode active material layer 130.
- the thickness buffer 500 is an electrolyte swelling layer.
- the electrolyte swelling layer may be expanded or flexible by being impregnated with a liquid, and may be made of a polymer material.
- One characteristic of the polymer material is that solvent molecules may penetrate between the chains of the polymer material, thereby increasing the volume.
- the electrolyte swelling layer expands or becomes flexible when it absorbs the electrolyte solution, thereby relieving the stress concentration in the empty space 400 and preventing the occurrence of cracks due to the empty space 400, thereby reducing the safety hazards that may arise. problems can be solved.
- the electrolyte swelling layer includes polyurethane.
- the electrolyte swelling layer is not limited thereto as long as it is swollen by the electrolyte solution.
- the electrolyte swelling layer contains the compound and is swollen by the electrolyte solution, thereby relieving stress concentration in the empty space 400 and preventing damage to the separator and electrode.
- the electrolyte swelling layer can be considered swollen when the thickness (T2) of the thickness buffer is 90% to 100% of the end thickness (T1) of the second electrode, and the thickness (T2) of the thickness buffer is measured by a thickness gauge. It can be measured by .
- the thickness buffering portion 500 is an electrolyte swelling tape including the electrolyte swelling layer.
- the width (HL) of the swelling tape may be 50% to 100% of the width of the first electrode.
- the width (HL) of the swelling tape may be 50% or more, 55% or more, 60% or more, 65% or more, or 70% or more compared to the width of the first electrode.
- the width (HL) of the swelling tape may be 100% or less, 95% or less, 90% or less, 85% or less, or 80% or less of the width of the first electrode.
- the first electrode 100 includes a first electrode current collector 110 and a first electrode active material layer 130 provided on the first electrode current collector 110, and the electrolyte solution.
- the swelling tape is attached directly or via the separator to the surface opposing the winding center of the first electrode between the end 250 of the second electrode and the end of the first electrode active material layer 130.
- the electrolyte swelling tape may be provided with a length of 50% or more of the length between the end 250 of the second electrode and the end of the first electrode active material layer 130.
- the electrolyte swelling tape is 50% or more, 55% or more, 60% or more, 65% or more, or 70% or more of the length between the end 250 of the second electrode and the end of the first electrode active material layer 130. You can.
- the electrolyte swelling tape may be 100% or less of the length between the end 250 of the second electrode and the end of the first electrode active material layer 130.
- the electrolyte swelling tape is not limited to the length from the end 250 of the second electrode to the end of the first electrode active material layer 130.
- the electrolyte swelling tape is the first electrode active material. It may be provided directly on the surface opposite to the winding center of the first electrode between the first electrode uncoated regions 150 beyond the end of the layer 130 or through the separator.
- the first electrode 100 is a first electrode current collector provided at one end of the outermost portion 211 of the electrode assembly in the direction P perpendicular to the winding axis. It includes an uncoated portion 150 not provided with the electrode active material layer at an edge portion of 110, and further includes a protective tape 160 provided on the uncoated portion 150.
- the first electrode 100 has a tab 140 provided at one or more of both ends in the longitudinal direction of the electrode assembly, that is, in the direction (P) perpendicular to the winding axis of the electrode assembly.
- the second electrode 200 further includes tabs 240 provided at portions other than both ends in the direction P perpendicular to the winding axis of the electrode assembly.
- Figure 5 shows an electrode assembly 111 according to an embodiment of the present invention, where (a) is a front view and (b) is a top view.
- 6 to 8 are plan views schematically showing a first electrode and a second electrode of an electrode assembly according to an embodiment of the present invention.
- a first electrode tab 140 is electrically connected to the first electrode current collector 110 of the first electrode 100 to form a first electrode tab 140 that protrudes to the outside of the electrode assembly 111. , the first electrode tab 140 provides a path through which current is input and output during the charging or discharging process of the secondary battery.
- the protective tape 160 is applied to the uncoated portion 150 of the first electrode current collector electrically connected to the first electrode tab 140 and the portion opposite in the thickness direction of the uncoated portion, such as a mark ( mark).
- the protective tape 160 can cover and protect not only the first electrode tab 140 but also a mark that may be created on the opposite side thereof when forming the first electrode tab 140.
- the end of the first electrode protection tape 160 may coincide with the end of the first electrode.
- the protective tape 160 By providing the protective tape 160 on the first electrode 100, short circuit with the end 250 of the second electrode can be prevented.
- the protective tape 160 prevents short circuit between the outermost first electrode 100 and the outermost second electrode 200 due to marks generated when forming the first electrode tab 140. You can. Therefore, short circuiting of the electrodes can be prevented by the protective tape 160 provided on the first electrode 100 facing the second electrode 200.
- the length of the protective tape 160 in the winding axis direction (H) is about 100 to about 120% of the length of the first electrode current collector 110 in the winding axis direction (H), preferably about 105 to about 110%. It may be %. When the length of the protective tape 160 in the winding axis direction (H) satisfies the above range, short circuit between electrodes can be prevented and a desired electrochemical reaction of the first electrode active material can be induced.
- the protective tape 160 may include one or more selected from the group consisting of polypropylene, polyethyleneterephthalate, and polyimide.
- the protective tape 160 can protect the first electrode active material layer by adhering to it with excellent elasticity and durability in response to volume changes due to charging and discharging.
- One embodiment of the present invention provides a secondary battery 600 including at least one of the electrode assemblies 111 described above.
- the secondary battery 600 may include an electrode assembly 111, a battery can, a seal, and a terminal.
- the first electrode 100 may be a cathode
- the second electrode 200 may be an anode, which is an electrode having a polarity opposite to that of the first electrode 100.
- the first electrode 100 and the second electrode 200 may have a sheet shape.
- the electrode assembly 111 may have, for example, a jelly roll shape. That is, the electrode assembly 111 can be manufactured by winding a laminate formed by sequentially stacking the first electrode 100, the separator, the second electrode 200, and the separator at least once, based on the winding center. there is. In this case, an additional separator may be provided on the outer peripheral surface of the electrode assembly 111 to insulate it from the battery can.
- the positive electrode active material coated on the positive electrode current collector and the negative electrode active material coated on the negative electrode current collector can be used without limitation as long as they are active materials known in the art.
- Non-limiting examples of the positive electrode active material include common positive electrode active materials that can be used in the positive electrode of conventional electrochemical devices, especially lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron oxide, or lithium composites combining these. Oxides can be used.
- the positive electrode active material has the general formula A[ A Contains at least one element selected from Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; x ⁇ 0, 1 ⁇ x+y ⁇ 2, - 0.1 ⁇ z ⁇ 2; the stoichiometric coefficients of the components included in x, y, z and M are selected so that the compound remains electrically neutral.
- the positive electrode active material is an alkali metal compound xLiM 1 O 2-(1-x) Li 2 M 2 O 3 disclosed in US6,677,082, US6,680,143, etc.
- M 1 is at least one element having an average oxidation state of 3
- M 2 may include at least one element having an average oxidation state of 4; 0 ⁇ x ⁇ 1).
- the positive electrode active material has the general formula Li a M 1 x Fe 1-x M 2 P y1-y M 3 z O 4-z
- M 1 is Ti, Si, Mn, Co, Fe, V, Cr , Mo, Ni, Nd, Al, Mg and Al
- M 2 includes Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, Contains at least one element selected from As, Sb, Si, Ge, V and S
- M3 includes a halogen element optionally including F; 0 ⁇ a ⁇ 2, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1 , 0 ⁇ z ⁇ 1; the stoichiometric coefficients of the components included in a, x, y, z, M 1 , M 2 , and M 3 are chosen so that the compounds remain electrically neutral), or Li 3 M 2 (PO 4 ) It may be lithium metal phosphate represented by 3 [M includes at least one element
- the positive electrode active material may include primary particles and/or secondary particles in which primary particles are aggregated.
- Non-limiting examples of the negative electrode active material include common negative electrode active materials that can be used in the negative electrode of conventional electrochemical devices, especially lithium metal or lithium alloy, carbon, petroleum coke, activated carbon, Lithium adsorption materials such as graphite or other carbons can be used.
- the negative electrode active material may be carbon material, lithium metal or lithium metal compound, silicon or silicon compound, tin or tin compound, etc.
- Metal oxides such as TiO 2 and SnO 2 with a potential of less than 2V can also be used as negative electrode active materials.
- carbon materials both low-crystalline carbon and high-crystalline carbon can be used.
- Non-limiting examples of positive electrode current collectors include foils made of aluminum, nickel, or a combination thereof
- non-limiting examples of negative electrode current collectors include foils made of copper, gold, nickel, or copper alloys, or combinations thereof. There are foils, etc.
- the separator is a porous polymer film, for example, a porous polymer film made of polyolefin polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, ethylene/methacrylate copolymer, etc. Alternatively, they can be used by stacking them.
- the separator may be a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, etc.
- At least one surface of the separator may include a coating layer of inorganic particles.
- the separator itself is made of a coating layer of inorganic particles.
- the particles constituting the coating layer may have a structure combined with a binder such that an interstitial volume exists between adjacent particles.
- the inorganic particles may be made of an inorganic material with a dielectric constant of 5 or more.
- the inorganic particles include Pb(Zr,Ti)O 3 (PZT), Pb 1-x La x Zr 1-y Ti y O 3 (PLZT), PB(Mg 3 Nb 2/3 )O 3 - PbTiO 3 (PMN-PT), BaTiO 3 , hafnia(HfO 2 ), SrTiO 3 , TiO 2 , Al 2 O 3 , ZrO 2 , SnO 2 , CeO 2 , MgO, CaO, ZnO and Y 2 O 3 It may contain at least one substance selected from the group consisting of
- the electrolyte may be a salt with a structure such as A + B - .
- a + includes alkali metal cations such as Li + , Na + , K + or ions consisting of a combination thereof.
- B - is F - , Cl - , Br - , I - , NO 3 - , N(CN) 2 - , BF 4 - , ClO 4 - , AlO 4 - , AlCl 4 - , PF 6 - , SbF 6 - , AsF 6 - , BF 2 C 2 O 4 - , BC 4 O 8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3 ) 6 P - , CF 3 SO 3 - , C 4 F 9 SO 3 - , CF 3
- the electrolyte can also be used by dissolving it in an organic solvent.
- Organic solvents include propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), and dipropyl carbonate (DPC). , dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (N-methyl- 2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), gamma butyrolactone, or mixtures thereof may be used.
- Another embodiment of the present invention provides a battery pack 700 including at least one secondary battery 600 described above.
- the secondary battery 600 may be a cylindrical secondary battery.
- the cylindrical secondary battery 600 according to the above-described embodiment can be used to manufacture the battery pack 700.
- FIG. 9 is a diagram illustrating a schematic configuration of a battery pack 700 including secondary batteries 600 according to an embodiment of the present invention.
- a battery pack 700 includes an assembly of cylindrical secondary batteries 600 electrically connected and a pack housing 710 accommodating the same.
- the cylindrical secondary battery 600 is a battery cell according to the above-described embodiment.
- parts such as bus bars, cooling units, and external terminals for electrical connection of cylindrical secondary batteries are omitted.
- Another embodiment of the present invention provides a vehicle 800 including at least one battery pack 700 described above.
- the battery pack 700 may be mounted in a vehicle 800.
- vehicle 800 may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle.
- Motor vehicles include four-wheeled vehicles or two-wheeled vehicles.
- FIG. 10 is a diagram for explaining a vehicle 800 including the battery pack 700 of FIG. 9 .
- a vehicle 800 includes a battery pack 700 according to an embodiment of the present invention.
- the vehicle operates by receiving power from the battery pack 700 according to an embodiment of the present invention.
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Abstract
Description
Claims (22)
- 제1 전극, 분리막 및 제2 전극이 적층되어 권취된 전극 조립체로서,상기 전극 조립체의 최외곽부는 상기 제1 전극이 상기 분리막을 개재하여 상기 제2 전극의 단부를 덮고 있는 빈 공간 및 상기 빈 공간에 구비된 두께 완충부를 포함하는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 제1 전극은 제1 전극 집전체 및 상기 제1 전극 집전체 상에 구비된 제1 전극 활물질층을 포함하고,상기 두께 완충부는 상기 제2 전극의 단부에서부터 상기 제1 전극 활물질층의 단부 사이에서 상기 제1 전극의 권취 중심부에 대향하는 면에 직접 또는 상기 분리막을 개재하여 구비되는 것인 전극 조립체.
- 청구항 2에 있어서, 상기 두께 완충부는 상기 제2 전극의 단부에서부터 상기 제1 전극 활물질층의 단부 사이의 길이 대비 50% 이상의 길이로 구비되는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 두께 완충부는 상기 제2 전극의 단부의 두께 이하의 두께로 구비되는 것인 전극 조립체.
- 청구항 4에 있어서, 상기 두께 완충부는 상기 제2 전극의 단부의 두께 대비 70% 내지 100%의 두께로 구비되는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 두께 완충부는 상기 제2 전극의 단부와 겹쳐지지 않는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 두께 완충부는 상기 전극 조립체의 권취축 방향에서 상기 전극 조립체 길이 100% 대비 50% 내지 100%의 길이로 구비되는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 제2 전극은 제2 전극 집전체 및 상기 제2 전극 집전체 상에 구비된 제2 전극 활물질층을 포함하고,상기 제2 전극의 단부에서 상기 제2 전극 집전체의 단부 및 상기 제2 전극 활물질층의 단부가 일치하는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 제2 전극의 단부는 상기 권취된 전극 조립체의 권취 종결부에 구비되는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 제1 전극은 상기 분리막을 개재하여 대면하는 상기 제2 전극보다 권취축에 수직인 방향으로 길게 구비되는 것인 전극 조립체.
- 청구항 2에 있어서, 상기 제1 전극의 권취 중심부에 대향하는 면에 구비된 상기 제1 전극 활물질층은 상기 분리막을 개재하여 대면하는 제2 전극의 단부보다 권취축에 수직인 방향으로 길게 구비되는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 두께 완충부는 전해액 팽윤층인 것인 전극 조립체.
- 청구항 12에 있어서, 상기 전해액 팽윤층은 폴리우레탄을 포함하는 것인 전극 조립체.
- 청구항 12에 있어서, 상기 두께 완충부는 상기 전해액 팽윤층을 포함하는 전해액 팽윤테이프인 것인 전극 조립체.
- 청구항 14에 있어서, 상기 제1 전극은 제1 전극 집전체 및 상기 제1 전극 집전체 상에 구비된 제1 전극 활물질층을 포함하고,상기 전해액 팽윤테이프는 상기 제2 전극의 단부에서부터 상기 제1 전극 활물질층의 단부 사이에서 상기 제1 전극의 권취 중심부에 대향하는 면에 직접 또는 상기 분리막을 개재하여 부착되는 것인 전극 조립체.
- 청구항 2에 있어서, 상기 제1 전극은 상기 전극 조립체의 최외곽부에서 권취축에 수직인 방향의 일 단부에 구비된 상기 제1 전극 집전체의 가장자리부에 상기 제1 전극 활물질층이 구비되지 않은 무지부를 포함하고,상기 무지부에 구비된 보호 테이프를 더 포함하는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 제1 전극은 상기 전극 조립체의 권취축에 수직인 방향의 양 단부 중 어느 하나 이상에 구비된 탭을 더 포함하는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 제2 전극은 상기 전극 조립체의 권취축에 수직인 방향의 양 단부 이외의 부분에 구비된 탭을 더 포함하는 것인 전극 조립체.
- 청구항 1에 있어서, 상기 제1 전극은 음극이고, 상기 제2 전극은 양극인 것인 전극 조립체.
- 청구항 1 내지 19 중 어느 한 항에 따른 전극 조립체를 포함하는 이차 전지.
- 청구항 20에 따른 이차 전지를 포함하는 배터리 팩.
- 청구항 21에 따른 배터리 팩을 적어도 하나 포함하는 것인 자동차.
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EP23831891.9A EP4358229A1 (en) | 2022-06-28 | 2023-06-28 | Electrode assembly, secondary battery, battery pack, and vehicle |
CN202380013036.0A CN117795734A (zh) | 2022-06-28 | 2023-06-28 | 电极组件、二次电池、电池组和车辆 |
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KR10-2023-0082700 | 2023-06-27 |
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JPH05234620A (ja) * | 1992-02-24 | 1993-09-10 | Sony Corp | 非水電解液二次電池 |
JPH0676857A (ja) * | 1992-08-25 | 1994-03-18 | Shin Kobe Electric Mach Co Ltd | ニッケル−水素電池 |
US6677082B2 (en) | 2000-06-22 | 2004-01-13 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
US6680143B2 (en) | 2000-06-22 | 2004-01-20 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
KR20150054221A (ko) * | 2013-11-11 | 2015-05-20 | 주식회사 엘지화학 | 유동 공간이 형성된 이차 전지 및 유동 공간 형성 방법 |
KR20150111723A (ko) * | 2014-03-26 | 2015-10-06 | 주식회사 엘지화학 | 스웰링 테이프 및 이를 포함하는 이차전지 |
KR20170038405A (ko) * | 2015-09-30 | 2017-04-07 | 주식회사 엘지화학 | 이차전지 |
KR20220078696A (ko) | 2019-10-17 | 2022-06-10 | 마이크로소프트 테크놀로지 라이센싱, 엘엘씨 | 강화된 동시성 가비지 컬렉션 스택 스캐닝 |
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- 2023-06-28 EP EP23831891.9A patent/EP4358229A1/en active Pending
- 2023-06-28 WO PCT/KR2023/009006 patent/WO2024005532A1/ko active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05234620A (ja) * | 1992-02-24 | 1993-09-10 | Sony Corp | 非水電解液二次電池 |
JPH0676857A (ja) * | 1992-08-25 | 1994-03-18 | Shin Kobe Electric Mach Co Ltd | ニッケル−水素電池 |
US6677082B2 (en) | 2000-06-22 | 2004-01-13 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
US6680143B2 (en) | 2000-06-22 | 2004-01-20 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
KR20150054221A (ko) * | 2013-11-11 | 2015-05-20 | 주식회사 엘지화학 | 유동 공간이 형성된 이차 전지 및 유동 공간 형성 방법 |
KR20150111723A (ko) * | 2014-03-26 | 2015-10-06 | 주식회사 엘지화학 | 스웰링 테이프 및 이를 포함하는 이차전지 |
KR20170038405A (ko) * | 2015-09-30 | 2017-04-07 | 주식회사 엘지화학 | 이차전지 |
KR20220078696A (ko) | 2019-10-17 | 2022-06-10 | 마이크로소프트 테크놀로지 라이센싱, 엘엘씨 | 강화된 동시성 가비지 컬렉션 스택 스캐닝 |
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