WO2023090937A1 - 절연테이프, 젤리롤, 이차 전지, 배터리 팩 및 자동차 - Google Patents
절연테이프, 젤리롤, 이차 전지, 배터리 팩 및 자동차 Download PDFInfo
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- WO2023090937A1 WO2023090937A1 PCT/KR2022/018310 KR2022018310W WO2023090937A1 WO 2023090937 A1 WO2023090937 A1 WO 2023090937A1 KR 2022018310 W KR2022018310 W KR 2022018310W WO 2023090937 A1 WO2023090937 A1 WO 2023090937A1
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- WIPO (PCT)
- Prior art keywords
- electrode
- electrode assembly
- insulating tape
- battery
- shape
- Prior art date
Links
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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
- H01M10/04—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
- H01M10/058—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
- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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 insulating tapes, jelly rolls, secondary batteries, battery packs, and automobiles.
- Secondary batteries which are highly applicable to each product group and have electrical characteristics such as high energy density, are used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by an electrical driving source. It is universally applied.
- EVs electric vehicles
- HEVs hybrid electric vehicles
- a battery pack may be configured by connecting a plurality of battery cells in series.
- a battery pack may be configured by connecting a plurality of battery cells in parallel according to a charge/discharge capacity required for the battery pack. Accordingly, the number of battery cells included in the battery pack and the type of electrical connection may be variously set according to a required output voltage and/or charge/discharge capacity.
- the present invention is to provide a jelly roll and a secondary battery capable of implementing high energy density.
- Another object of the present invention is to provide an insulating tape for implementing the jelly roll as described above.
- An exemplary embodiment of the present invention is an electrode assembly having a structure in which a first electrode, a separator, and a second electrode are stacked and wound; and an insulating tape provided to cover at least a portion of a side surface of the electrode assembly and at least a portion of an end portion of the electrode assembly, wherein the insulating tape is provided in a region covering at least a portion of an end portion of the electrode assembly.
- a jelly roll having a notching pattern is provided.
- Another embodiment of the present invention is an insulating tape for attaching to cover at least a portion of the side surface of an electrode assembly having a structure in which a first electrode, a separator, and a second electrode are stacked and wound, and at least a portion of an end portion of the electrode assembly. , It provides an insulating tape having at least one notching pattern on at least one edge portion.
- Another embodiment of the present invention provides a secondary battery including a jelly roll according to the above-described embodiment.
- the exemplary embodiments of the present invention by minimizing or preferably eliminating the overlapping area of the insulating tape at the end of the electrode assembly, other parts provided at the end side of the electrode assembly, for example, an additional insulating member or current collector plate It is possible to prevent a lifting problem in which a space between ends of the electrode assembly is generated. Accordingly, an electrical connection defect between the electrode tab portion and the electrode terminal portion may be prevented. In addition, when welding is performed to electrically connect the electrode tab part to the electrode terminal part directly or through a current collector plate, welding defects may be prevented from occurring.
- the current applied to the battery can be increased by forming the tab structure of the electrode included in the electrode assembly as a non-coated portion on the current collector on which the electrode active material is not coated.
- the size of the battery can be increased, and high energy density and cost can be reduced.
- FIG. 1 is a photograph comparing the case where an insulating tape is attached (left) and the case where an insulating tape having a notching pattern is attached (right) at the end of an electrode assembly.
- FIG. 2 is a photograph comparing a case in which an insulating tape without a notching pattern is attached (left) and an insulating tape with a notching pattern (right) are attached from the side of an electrode assembly.
- FIG. 3 is a case of attaching an insulating tape without a notching pattern (left) and a case of attaching an insulating tape having a notching pattern (right), whether or not a lifting phenomenon occurs when an additional insulating member is placed on the upper surface of the electrode assembly is a comparison picture.
- FIG. 4 is a view showing the shape of a notching pattern of an insulating tape and a state after attaching the insulating tape according to an embodiment of the present invention.
- FIG. 5 is a diagram showing a schematic configuration of a secondary battery according to an embodiment of the present invention.
- FIG. 6 is a longitudinal cross-sectional view of the secondary battery of FIG. 5 .
- FIG. 7 is a longitudinal cross-sectional view showing a schematic configuration of a secondary battery according to an embodiment of the present invention, wherein (a) is a U-shaped insulating member and (b) is a diagram showing a case including a --shaped insulating member.
- FIG. 8 is a view showing a schematic configuration of an electrode assembly included in the secondary battery of FIG. 5 .
- FIG. 9 is a view showing a schematic configuration of an electrode assembly according to another embodiment of the present invention.
- FIG. 10 is a view showing the ends of the electrode assembly in order to calculate the area covered by the insulating tape on the ends of the electrode assembly.
- FIG. 11 shows lifting confirmation of Example 1
- FIG. 12 shows lifting confirmation of Comparative Example 1
- FIG. 13 is a photograph showing lifting confirmation of Comparative Example 3, respectively.
- 15 is a diagram showing a schematic configuration of a battery pack including the secondary battery of FIG. 6 .
- FIG. 16 is a diagram showing a schematic configuration of a vehicle including the battery pack of FIG. 15 .
- An exemplary embodiment of the present invention is an electrode assembly having a structure in which a first electrode, a separator, and a second electrode are stacked and wound; and an insulating tape provided to cover at least a portion of a side surface of the electrode assembly and at least a portion of an end portion of the electrode assembly, wherein the insulating tape is provided in a region covering at least a portion of an end portion of the electrode assembly.
- a jelly roll having a notching pattern is provided.
- the notching pattern of the insulating tape refers to a pattern in which grooves are formed by being cut from an edge of the insulating tape.
- the end of the electrode assembly means an end in the vertical direction of the winding shaft of the electrode assembly, and the side surface of the electrode assembly means a surface horizontal to the winding shaft among outer surfaces of the electrode assembly.
- An area where the insulating tapes overlap each other in a region covering at least a portion of an end portion of the electrode assembly may be minimized by the notching pattern of the insulating tape. Accordingly, the electrode assembly can be compactly packed in the battery can by preventing lifting at the end of the electrode assembly.
- due to the nature of the battery it is possible to prevent a lifting phenomenon at the end of the electrode assembly, thereby preventing defects in electrical connection between the electrode tab part and the electrode terminal part, and as a result, resistance is lowered and high energy density can be maintained.
- the electrode tab portion may be the first electrode tab portion or the positive electrode tab portion of the electrode assembly, that is, the first electrode uncoated portion or the anode uncoated portion.
- the electrode terminal part may be a first electrode terminal part or a positive electrode terminal part.
- the area in which the insulating tapes overlap each other is 10% or less of the total area covering the end portion of the electrode assembly.
- an area where the insulating tapes overlap each other may be 9% or less, 8% or less, or 7% or less of the total area covering the end portion of the electrode assembly, and more preferably, the insulating tape is The insulating tapes may not overlap each other in the region covering the ends.
- FIG. 1 is a photograph comparing the case where an insulating tape without a notching pattern is attached (left) and the case where an insulating tape having a notching pattern is attached (right) at an end of an electrode assembly.
- the portion where the insulating tape overlaps (marked with a circle) is observed, but in the photo on the right, the overlapping of the insulating tape does not occur.
- FIG. 2 is a photograph comparing a case in which an insulating tape without a notching pattern is attached (left) and an insulating tape with a notching pattern (right) are attached from the side of an electrode assembly.
- a step (marked by a circle) is observed due to the overlapping portion of the insulating tape, but in the photo on the right, a step due to the overlapping of the insulating tape does not occur.
- the insulating tape has two or more notching patterns, and the shape of the flag provided between two adjacent notching patterns may be at least one of a trapezoid, a rectangle, a parallelogram, a triangle, and a semicircle.
- the flag shape may be provided in a region where the insulating tape extends from a side surface of the electrode assembly and covers an end portion of the electrode assembly, and these flag shapes are advantageous in preventing overlapping at the end portion of the electrode assembly.
- the flag shape is not limited thereto, and may be employed in the present invention as long as it does not overlap with each other at the end of the electrode assembly.
- the shape of the notching pattern of the insulating tape is at least one of a trapezoidal shape, a square shape, a parallelogram shape, a triangle shape, and a semicircular shape.
- the shape of the notching pattern is not limited thereto, and any shape that prevents the insulating tapes from overlapping each other at the ends of the electrode assembly may be employed in the present invention.
- FIG. 4 is a view showing the shape of a notching pattern of an insulating tape and a state after attaching the insulating tape according to an embodiment of the present invention.
- the notching pattern shape 130 is trapezoidal, the flag shape 140 is triangular, and the shape of the insulating tape provided at the end of the electrode assembly is triangular.
- the shape of the notching pattern 130 is trapezoidal, the flag shape 140 is trapezoidal, and the shape of the insulating tape 120 provided at the end of the electrode assembly is trapezoidal (below).
- At least one of the first electrode and the second electrode includes a current collector and an electrode active material layer provided on the contact body, and the current collector is not provided with the electrode active material layer. and a non-coated portion, at least a portion of the non-coated portion is exposed on the side surface of the electrode assembly, and the insulating tape is provided to cover the non-coated portion of the side surface of the electrode assembly.
- At least a portion of the uncoated portion provided on the side surface of the electrode assembly may be used as an electrode tab by itself.
- the insulating tape is provided to cover the uncoated portion, thereby preventing electrical contact with the battery can.
- the notching pattern of the insulating tape prevents lifting at the ends of the electrode assembly, thereby preventing defects in electrical connection between the electrode tab and the electrode terminal.
- the insulating tape is provided to cover 5% to 60% of the first electrode or the second electrode exposed at the end of the electrode assembly.
- At least a portion of the uncoated portion is exposed at an end of the electrode assembly, and the insulating tape is provided to cover 5% to 60% of the uncoated portion at the end of the electrode assembly.
- the first electrode or the second electrode may be exposed at an end of the electrode assembly, and specifically, at least a portion of the non-coated portion not provided with an electrode active material layer may be exposed on the first electrode or the second electrode. there is.
- At least a portion of the uncoated portion provided at the end of the electrode assembly may be used as an electrode tab by itself, and as will be described later, a current collector plate provided at the end of the electrode assembly may be further included to be electrically connected.
- At least a portion of the uncoated portion of the first electrode or the second electrode and/or the current collector plate connected thereto may be exposed at an end of the electrode assembly.
- the insulating tape being provided to cover 5% to 60% of the first electrode or the second electrode or the uncoated portion of the end of the electrode assembly means that the first electrode or the first electrode exposed from the outer circumferential surface of the end of the electrode assembly It may mean covering 5% to 60% of the second electrode or the uncoated portion.
- the insulating tape may be provided to cover 5% or more, 10% or more, 15% or more, 20% or more, or 25% or more of the first electrode or the second electrode or the uncoated portion of the end of the electrode assembly. there is.
- the insulating tape covers 60% or less, 55% or less, 50% or less, 45% or less, 40% or less, or 35% or less of the first electrode or the second electrode or the uncoated portion of the end of the electrode assembly. may be provided.
- the insulating tape is provided to cover 5% to 60% of the first electrode or the second electrode at the end of the electrode assembly, the uncoated portion of the first electrode or the second electrode, and/or the current collector plate connected thereto Thus, electrical contact with the battery can can be prevented.
- the notching pattern of the insulating tape prevents lifting at the ends of the electrode assembly, thereby preventing defects in electrical connection between the electrode tab part and the electrode terminal part.
- the thickness of the insulating tape is 10 ⁇ m to 100 ⁇ m.
- the insulating tape may have a thickness of 10 ⁇ m or more, 13 ⁇ m or more, 15 ⁇ m or more, or 17 ⁇ m or more.
- the insulating tape may have a thickness of 100 ⁇ m or less, 90 ⁇ m or less, 80 ⁇ m or less, 70 ⁇ m or less, 60 ⁇ m or less, 50 ⁇ m or less, 40 ⁇ m or less, or 30 ⁇ m or less.
- the insulating tape can cover the uncoated portion to prevent electrical contact with the battery can, and prevent a lifting phenomenon at the end of the electrode assembly to prevent a defect in the electrical connection between the electrode tab portion and the electrode terminal portion.
- the insulating tape includes a fabric and an adhesive layer, the fabric has a thickness of 3 ⁇ m to 25 ⁇ m, and the adhesive layer has a thickness of 2 ⁇ m to 20 ⁇ m.
- the insulating tape may include a fabric and an adhesive layer, and the thickness of the insulating tape including the fabric and the adhesive layer may be 15 ⁇ m or more, 20 ⁇ m or more, 25 ⁇ m or more, or 30 ⁇ m or more.
- the insulating tape including the fabric and the adhesive layer may have a thickness of 90 ⁇ m or less, 80 ⁇ m or less, 70 ⁇ m or less, or 60 ⁇ m or less.
- the fabric of the insulating tape may have a thickness of 5 ⁇ m or more, 7 ⁇ m or more, 9 ⁇ m or more, or 11 ⁇ m or more.
- the fabric of the insulating tape may have a thickness of 23 ⁇ m or less, 21 ⁇ m or less, 19 ⁇ m or less, or 17 ⁇ m or less.
- the adhesive layer of the insulating tape may have a thickness of 4 ⁇ m or more, 6 ⁇ m or more, 8 ⁇ m or more, or 10 ⁇ m or more.
- the adhesive layer of the insulating tape may have a thickness of 18 ⁇ m or less, 16 ⁇ m or less, 14 ⁇ m or less, or 12 ⁇ m or less.
- the insulating tape having the notching pattern can be better adhered to the end of the electrode assembly, and specifically, the thinner the thickness of the fabric of the insulating tape, the more advantageous it is, and the adhesive layer of the insulating tape The thicker the thickness, the better it can stick to the end of the electrode assembly.
- the thickness of the fabric may be reduced by about 50% compared to the conventional case, and the thickness of the adhesive layer may be increased by about 150%.
- the thickness of the fabric of the insulating tape is thin and the thickness of the adhesive layer of the insulating tape is thick, so it may be advantageous for adhesion at the end of the electrode assembly.
- the insulating tape is made of polyimide, polyethylene, polypropylene, polytetrafluoroethylene, polyethylene terephthalate, and polybutylene. It includes at least one selected from the group consisting of terephthalate (polybutylene terephthalate).
- the material of the insulating tape is not particularly limited as long as it is an insulating material that does not elute, swell, or cause a side reaction by the electrolyte.
- a current collector plate provided at an end side of the electrode assembly is further included, and the current collector plate is disposed between the insulating tape and the electrode assembly in a region where the insulating tape covers the end portion of the electrode assembly. , or the current collector plate may be located on the other end side, which is the opposite side of the surface of the electrode assembly facing the insulating tape.
- a current collecting plate positioned between the insulating tape and the electrode assembly may be a first current collecting plate, and another surface opposite to the surface of the electrode assembly facing the insulating tape.
- the current collecting plate positioned at the end may be a second current collecting plate.
- the first current collector plate may be electrically connected to the uncoated portion, and may also be electrically connected to an electrode terminal on the opposite side.
- lifting may be prevented at an end portion of the electrode assembly, thereby facilitating electrical connection of the electrode terminal portion and preventing welding defects from occurring.
- an insulating member provided to cover the end of the electrode assembly or at least a portion of the end of the electrode assembly and at least a portion of a side surface of the electrode assembly may be further included at the end side of the electrode assembly.
- the insulating member may be an insulator, and the insulator may prevent electrical contact between the jelly roll electrode tab portion and the battery can to prevent a short circuit of the electrode.
- the gap with the insulating member can be narrowed by minimizing the area where the insulating tape overlaps at the end of the electrode assembly, and the electrical connection between the electrode tab part and the electrode terminal part is poor can prevent
- the lifting phenomenon of the insulating member was higher than that of the case of attaching the insulating tape with the notching pattern.
- FIG. 7 is a longitudinal cross-sectional view showing a schematic configuration of a secondary battery according to an embodiment of the present invention, wherein (a) is a U-shaped insulating member and (b) is a diagram showing a case including a --shaped insulating member.
- the insulating member 60 may be provided to cover at least a portion of an end of the electrode assembly and at least a portion of a side surface of the electrode assembly, and the insulating member 60 60 may be, for example, a U-shaped insulating member.
- the insulating member 60 may be provided at the end side of the electrode assembly to cover at least a portion of the end of the electrode assembly, and the insulating member 60 May be, for example, a --shaped insulating member.
- the gap between the insulating tape 60 and the insulating member 60 can be narrowed by minimizing the area where the insulating tape overlaps at the end of the electrode assembly. In addition, it is possible to prevent a defective electrical connection by preventing a lifting phenomenon between the electrode tab part and the electrode terminal part.
- Another embodiment of the present invention is an insulating tape for attaching to cover at least a portion of the side surface of an electrode assembly having a structure in which a first electrode, a separator, and a second electrode are stacked and wound, and at least a portion of an end portion of the electrode assembly. , It provides an insulating tape having at least one notching pattern on at least one edge portion.
- the insulating tape has two or more notching patterns, and the flag shape provided between two adjacent notching patterns is at least one of a trapezoid, a rectangle, a parallelogram, a triangle, and a semicircle, and the The shape of the notching pattern of the insulating tape is at least one of a trapezoidal shape, a square shape, a parallelogram shape, a triangle shape, and a semicircular shape.
- the description described in relation to the jelly roll described above may be applied to the shape, thickness, material, and structure of the notching pattern of the insulating tape.
- Another embodiment of the present invention is a jelly roll according to the above-described embodiment; a battery can having an opening on one side accommodating the jelly roll; an electrode terminal riveted through a through hole formed in the bottom of the battery can; a gasket provided between the electrode terminal and an outer diameter of the through hole; and a sealing body for sealing the open portion of the battery can.
- the first electrode is electrically connected to the electrode terminal
- the second electrode is electrically connected to the battery can
- the sealing body is insulated from the battery can .
- the description described in relation to the jelly roll described above may be applied to the shape, thickness, material, and structure of the notching pattern of the insulating tape included in the jelly roll included in the secondary battery.
- the first electrode may be an anode and the second electrode may be a cathode.
- FIG. 5 is a view showing a schematic configuration of a secondary battery according to an embodiment of the present invention
- FIG. 6 is a longitudinal cross-sectional view of the secondary battery of FIG. 5
- FIG. 8 is a schematic view of an electrode assembly included in the secondary battery of FIG. This is a diagram showing the configuration of
- the secondary battery 1 includes an electrode assembly 10, a battery can 20, a sealing body 30, and an electrode terminal 40.
- the jelly roll may include the electrode assembly 10 .
- the secondary battery 1 additionally includes a first collector plate 50 and/or an insulating member 60 and/or a gasket 70 and/or a second collector plate 80 and/or A sealing gasket 90 may be further included.
- the electrode assembly 10 includes a first electrode 11 as an anode, a second electrode 12 as a cathode, and a first electrode 11 and a second electrode 12 ) and a separator 13 interposed between them.
- the first electrode 11 and the second electrode 12 may have a sheet shape.
- the electrode assembly 10 may have, for example, a jellyroll shape. That is, in the electrode assembly 10, a laminate formed by sequentially stacking the first electrode 11, the separator 13, the second electrode 12, and the separator 13 at least once is wound around the center (C). It can be manufactured by winding based on. In this case, an additional separator 13 may be provided on the outer circumferential surface of the electrode assembly 10 to insulate it from the battery can 20 .
- the first electrode 11 and the second electrode 12 may include uncoated portions 11a and 12a on long sides of which the active material layer is not coated.
- the first electrode 11 and the second electrode 12 may include holding portions 11b and 12b coated with an active material layer except for the uncoated portions 11a and 12a.
- the first electrode 11 includes a first electrode current collector and a first electrode active material coated on one or both surfaces of the first electrode current collector.
- a region where the first electrode active material is applied on the first electrode current collector is referred to as a holding portion 11b provided in the first electrode 11 .
- An uncoated portion 11a to which the first electrode active material is not coated may exist at one end of the first electrode current collector in the width direction (direction parallel to the Z-axis). At least a part of the uncoated portion 11a is used as an electrode tab by itself. That is, the uncoated portion 11a functions as the uncoated portion 11a provided on the first electrode 11 .
- the uncoated portion 11a provided on the first electrode 11 is provided above the height direction (direction parallel to the Z-axis) of the electrode assembly 10 accommodated in the battery can 20 .
- An insulating layer may be additionally provided at the boundary between the uncoated portion 11a and the holding portion 11b of the first electrode 11 .
- the insulating layer has an effect of preventing a short circuit of the electrode even if the separator is contracted.
- the second electrode 12 includes a second electrode current collector and a second electrode active material coated on one or both surfaces of the second electrode current collector.
- a region where the second electrode active material is applied on the second electrode current collector is referred to as a holding portion 12b provided in the second electrode 12 .
- An uncoated portion 12a to which the second electrode active material is not coated may exist at the other end of the second electrode current collector in the width direction (direction parallel to the Z-axis). At least a part of the uncoated portion 12a is used as an electrode tab by itself. That is, the uncoated portion 12a functions as the uncoated portion 12a provided on the second electrode 12 .
- the uncoated portion 12a provided on the second electrode 12 is provided below the height direction (direction parallel to the Z-axis) of the electrode assembly 10 accommodated in the battery can 20 .
- the uncoated portion 11a provided on the first electrode 11 and the uncoated portion 12a provided on the second electrode 12 may protrude in opposite directions.
- the uncoated portion 11a provided on the first electrode 11 protrudes upward in the height direction (direction parallel to the Z-axis) of the electrode assembly 10, and the second electrode
- the uncoated portion 12a provided in (12) may protrude downward in the height direction (direction parallel to the Z-axis) of the electrode assembly 10.
- the uncoated portion 11a provided on the first electrode and the uncoated portion 12a provided on the second electrode are disposed in the width direction of the electrode assembly 10, that is, in the height direction (Z axis) of the secondary battery 1. It may be in the form of extending and protruding in opposite directions along a direction parallel to).
- the first electrode may be an anode and the second electrode may be a cathode.
- the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate may be used without limitation as long as they are known in the art.
- a conventional cathode active material that can be used for a cathode of a conventional electrochemical device can be used, and in particular, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron oxide, or a lithium composite of a combination thereof. oxides can be used.
- the cathode active material has the general formula A[A x M y ]O 2+z (A includes at least one element of Li, Na, and K; M is Ni, Co, Mn, Ca, Mg, Al, including 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 such that the compound remains electrically neutral).
- the cathode active material is an alkali metal compound disclosed in US6,677,082, US6,680,143, etc. xLiM 1 O 2- (1-x)Li 2 M 2 O 3 (M 1 is at least one element having an average oxidation state of 3). contains; M 2 contains at least one element having an average oxidation state of 4; 0 ⁇ x ⁇ 1).
- the cathode active material has the general formula Li a M 1 x Fe 1-x M 2 y P 1-y M 3 z O 4-z
- M 1 is Ti, Si, Mn, Co, Fe, V, Includes at least one element selected from Cr, Mo, Ni, Nd, Al, Mg, and Al
- M 2 is Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al , As, Sb, Si, Ge, includes at least one element selected from V and S
- M 3 includes a halogen group 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 selected such that the compound remains electrically neutral), or Li 3 M 2 It may be a lithium metal phosphate represented by (PO 4
- the cathode active material may include primary particles and/or secondary particles in which the primary particles are aggregated.
- Non-limiting examples of the negative electrode active material include conventional negative electrode active materials that can be used for negative electrodes of conventional electrochemical devices, particularly lithium metal or lithium alloy, carbon, petroleum coke, activated carbon, A lithium adsorption material such as graphite or other carbons may be used.
- the negative electrode active material may use a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, or the like.
- Metal oxides such as TiO 2 and SnO 2 having a potential of less than 2 V can also be used as an anode active material.
- the carbon material both low crystalline carbon and high crystalline carbon may be used.
- the separator is a porous polymer film, for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer. Alternatively, they may be laminated and used. As another example, the separator may use a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, or the like.
- At least one surface of the separator may include a coating layer of inorganic particles. It is also possible that the separation membrane itself is made of a coating layer of inorganic particles. Particles constituting the coating layer may have a structure combined with a binder so that an interstitial volume exists between adjacent particles.
- the inorganic particles may be made of an inorganic material having a dielectric constant of 5 or more.
- the inorganic particles are 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 include at least one or more materials selected from the group consisting of.
- the electrolyte may be a salt having a structure such as A + B - .
- a + includes alkali metal cations such as Li + , Na + , and K + or ions made of combinations thereof.
- B - is F - , Cl - , Br - , I - , NO3 - , 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 CF2
- the electrolyte can also be used by dissolving it in an organic solvent.
- organic solvent propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC) , dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone 2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), gamma butyrolactone, or mixtures thereof may be used.
- PC propylene carbonate
- EC ethylene carbonate
- DEC diethyl carbonate
- DMC dimethyl carbonate
- DPC dipropyl carbonate
- dimethyl sulfoxide acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran
- NMP N-methyl-2-pyrrolidon
- the battery can 20 is a substantially cylindrical container having an opening formed at a lower end thereof, and is made of, for example, a conductive material such as metal.
- the material of the battery can 20 may be aluminum, for example.
- the bottom portion of the battery can 20 provided with the open portion will be referred to as an open end.
- a side surface (outer circumferential surface) and an upper surface of the battery can 20 may be integrally formed.
- An upper surface (parallel to the X-Y plane) of the battery can 20 has a substantially flat shape.
- An upper surface located on the opposite side of the open end is referred to as a closed end.
- the battery can 20 accommodates the electrode assembly 10 through an opening formed at the bottom and also accommodates the electrolyte.
- the battery can 20 is electrically connected to the electrode assembly 10 .
- the battery can 20 may be electrically connected to one of the first electrode 11 and the second electrode 12 .
- the battery can may be electrically connected to the second electrode 12 of the electrode assembly 10 .
- the battery can 20 may have the same polarity as the second electrode 12 .
- the battery can 20 may include a beading portion 21 and a crimping portion 22 formed at a lower end thereof.
- the beading part 21 is located below the electrode assembly 10 .
- the beading part 21 is formed by press fitting around the outer circumferential surface of the battery can 20 .
- the beading part 21 prevents the electrode assembly 10, which may have a size substantially corresponding to the width of the battery can 20, from escaping through the opening formed at the lower end of the battery can 20, and the sealing body ( 30) can function as a support to be seated.
- the crimping part 22 is formed below the beading part 21 .
- the crimping part 22 has an extended and bent shape so as to cover the outer circumferential surface of the sealing body 30 disposed below the beading unit 21 and a part of the lower surface of the sealing body 30 .
- the present invention does not exclude the case where the battery can 20 does not have such a beading part 21 and/or crimping part 22. That is, in the present invention, when the battery can 20 does not include the beading portion 21 and/or the crimping portion 22, the electrode assembly 10 is fixed and/or the battery can 20 is sealed, For example, it can be realized through the additional application of a part that can function as a stopper for the electrode assembly 10 . In addition, if the secondary battery 1 of the present invention includes the sealing body 30, the electrode assembly 10 is fixed and/or the battery can 20 is sealed, for example, the sealing body 30 It can be realized through additional application of a structure that can be seated and/or welding between the battery can 20 and the sealing body 30. That is, the sealing body may seal the open end of the battery can.
- the sealing body 30 may be made of, for example, a metal material to ensure rigidity.
- the sealing body 30 may cover an open end formed at a lower end of the battery can 20 . That is, the sealing body 30 forms the lower surface of the secondary battery 1 .
- the sealing body 30 does not have polarity even when it is made of a metal material having conductivity. Having no polarity may mean that the sealing body 30 is electrically insulated from the battery can 20 and the electrode terminal 40 .
- the sealing body 30 does not function as the electrode terminal 40, that is, the positive or negative terminal. Therefore, the sealing body 30 does not need to be electrically connected to the electrode assembly 10 and the battery can 20, and the material does not necessarily have to be a conductive metal.
- the sealing body 30 When the battery can 20 of the present invention includes the beading part 21 , the sealing body 30 may be seated on the beading part 21 formed in the battery can 20 . In addition, when the battery can 20 of the present invention includes the crimping portion 22 , the sealing body 30 may be fixed by the crimping portion 22 . A sealing gasket 90 may be interposed between the sealing body 30 and the crimping portion 22 of the battery can 20 to ensure airtightness of the battery can 20 . Meanwhile, as described above, the battery can 20 of the present invention may not have the beading part 21 and/or the crimping part 22. In this case, the sealing gasket 90 is the battery can 20 It may be interposed between the structure for fixing provided on the open side of the battery can 20 and the sealing body 30 to ensure airtightness.
- the electrode terminal 40 may be electrically connected to the other one of the first electrode 11 and the second electrode 12 . That is, the electrode terminal 40 may have a polarity opposite to that of the battery can 20 .
- the electrode terminal 40 may be electrically connected to the first electrode 11 of the electrode assembly 10 .
- the surface of the electrode terminal 40 may be exposed to the outside.
- the electrode terminal 40 may be made of a conductive metal material.
- the electrode terminal 40 may pass through, for example, a substantially central portion of a closed end formed at an upper end of the battery can 20 . A portion of the electrode terminal 40 may be exposed to the upper portion of the battery can 20 and the remaining portion may be positioned inside the battery can 20 .
- the electrode terminal 40 may be fixed on the inner surface of the closed end of the battery can 20 by, for example, riveting.
- the electrode terminal 40 may pass through the insulating member 60 and be coupled to the uncoated portion 11a provided on the first current collector 50 or the first electrode 11 . In this case, the electrode terminal 40 may have a first polarity.
- the electrode terminal 40 can function as a first electrode terminal in the secondary battery 1 of the present invention.
- the electrode terminal 40 has the first polarity
- the electrode terminal 40 is electrically insulated from the battery can 20 having the second polarity. Electrical insulation between the electrode terminal 40 and the battery can 20 may be realized in various ways.
- an insulating tape is provided to cover at least a portion of the uncoated portion 11a provided on the first current collector 50 or the first electrode 11, thereby preventing electrical contact with the battery can. .
- the uncoated portion 11a and the electrode terminal 40 provided on the first current collector plate 50 or the first electrode 11 by preventing lifting at the ends of the electrode assembly by the notching pattern of the insulating tape. It is possible to prevent defects in the electrical connection of
- the size of the battery can be increased, and high energy density can be implemented and cost can be reduced.
- insulation may be realized by interposing a gasket 70, which will be described later, between the electrode terminal 40 and the battery can 20.
- insulation may be realized by forming an insulating coating layer on a part of the electrode terminal 40 .
- a method of structurally firmly fixing the electrode terminal 40 may be applied so that contact between the electrode terminal 40 and the battery can 20 is impossible.
- a plurality of methods among the methods described above may be applied together.
- the first current collector 50 may be coupled to an upper portion of the electrode assembly 10 .
- the first collector plate 50 may be coupled to the uncoated portion 11a provided on the first electrode 11 at the top of the electrode assembly 10 .
- the first current collector 50 may be made of a conductive metal material.
- the first current collector 50 may have a plurality of radially formed irregularities on its lower surface.
- the unevenness When the unevenness is formed, the unevenness may be pressed into the uncoated portion 11a provided in the first electrode 11 by pressing the first current collecting plate 50 .
- the secondary battery 1 may not include the first current collector 50 .
- the uncoated portion 11a provided on the first electrode 11 may be directly electrically connected to the electrode terminal 40 .
- the first current collector 50 may be coupled to an end of the uncoated portion 11a provided on the first electrode 11 .
- the coupling between the uncoated portion 11a of the first electrode 11 and the first current collector 50 may be performed by, for example, laser welding.
- the laser welding may be performed by partially melting the base material of the first current collector 50, or may be performed in a state where solder for welding is interposed between the first current collector 50 and the uncoated portion 11a. there is.
- the solder preferably has a lower melting point than that of the first current collector 50 and the uncoated portion 11a.
- resistance welding, ultrasonic welding, etc. are possible, but the welding method is not limited thereto.
- FIG. 9 is a view showing a schematic configuration of an electrode assembly according to another embodiment of the present invention.
- the first collector plate 50 is formed on a coupling surface formed by bending an end of the uncoated portion 11a provided in the first electrode 11 in a direction parallel to the first collector plate 50 . may be coupled to.
- the bending direction of the uncoated portion 11a may be, for example, a direction toward the winding center C of the electrode assembly 10 .
- the uncoated portion 11a has such a bent shape, the space occupied by the uncoated portion 11a is reduced, thereby improving energy density.
- an effect of improving bonding force and reducing resistance may be obtained.
- the insulating member 60 is a first current collector coupled to the upper portion of the electrode assembly 10 between the upper end of the electrode assembly 10 and the inner surface of the battery can 20 ( 50) and the inner surface of the battery can 20 or may be provided between the insulating tape 100 provided on top of the electrode assembly 10 and the inner surface of the battery can 20.
- the insulating member 60 is a contact between the uncoated portion 11a provided on the first electrode 11 and the battery can 20, a contact between the first current collector 50 and the battery can 20, and / or prevent contact between the insulating tape 100 and the battery can 20. That is, the insulating member 60 is accommodated inside the battery can 20 and blocks electrical connection between the uncoated portion 11a provided on the first electrode 11 and the battery can 20.
- the insulating member 60 may be made of a material having insulating performance.
- the insulating member 60 may include a polymer material.
- the insulating member 60 may include a U-shaped insulating member or a --shaped insulating member.
- the gasket 70 is interposed between the battery can 20 and the electrode terminal 40 so that the battery can 20 and the electrode terminal 40 having opposite polarities contact each other. prevent becoming That is, the gasket 70 blocks electrical connection between the battery can 20 and the electrode terminal 40 . Accordingly, the upper surface of the battery can 20 having a substantially flat shape can function as a terminal of the second electrode 12 of the secondary battery 1 .
- the second current collector 80 may be coupled to a lower portion of the electrode assembly 10 .
- the second current collector 80 may be made of a conductive metal material.
- the second collector plate 80 may be connected to the uncoated portion 12a provided on the second electrode 12 .
- the second current collector 80 may be electrically connected to the battery can 20 .
- the second collector plate 80 may be interposed and fixed between the inner surface of the battery can 20 and the sealing gasket 90 .
- the second current collector 80 may be welded to the inner wall surface of the battery can 20 .
- the second current collector 80 may include a plurality of radially formed irregularities on one surface thereof. When the unevenness is formed, the second current collector 80 may be pressed to press-fit the unevenness into the uncoated portion 12a provided in the second electrode 12 .
- the second current collector 80 may be coupled to an end of an uncoated portion 12a provided on the second electrode 12 .
- the coupling between the uncoated portion 12a of the second electrode 12 and the second current collector 80 may be performed by, for example, laser welding.
- the laser welding may be performed by partially melting the base material of the second current collector 80, or may be performed in a state where solder for welding is interposed between the second current collector plate 80 and the uncoated portion 12a. there is.
- the solder preferably has a lower melting point than that of the second current collector 80 and the uncoated portion 12a.
- resistance welding, ultrasonic welding, etc. are possible, but the welding method is not limited thereto.
- the second collector plate 80 has a coupling surface formed by bending an end of the uncoated portion 12a provided on the second electrode 12 in a direction parallel to the second collector plate 80. can be bonded onto.
- a bending direction of the uncoated portion 12a provided in the second electrode 12 may be, for example, a direction toward the winding center C of the electrode assembly 10 .
- the electrode assembly 10 according to the embodiment of FIG. 9 is similar to the electrode assembly 10 of the embodiment of FIG. 8 , redundant descriptions of components substantially the same as or similar to those of the previous embodiment will be omitted. , The differences from the previous embodiment will be mainly described.
- the electrode assembly 10 may have a structure in which at least some of the uncoated portions 11a and 12a are bent toward the core.
- at least some sections of the uncoated regions 11a and 12a may be divided into a plurality of segments.
- the plurality of segments may have a structure in which they are overlapped in several layers while being bent toward the core.
- the plurality of segments may be laser notched.
- the segment pieces can be formed by a known metal foil cutting process such as ultrasonic cutting or punching.
- the area of the first or second electrodes 11 and 12 exposed to the end of the electrode assembly or the uncoated portions 11a and 12a of the electrode is the total area of the end of the electrode assembly. It may be that the area of the core is subtracted.
- the gap is preferably 0.2 to 4 mm.
- the bending direction of the uncoated portions 11a and 12a may be, for example, a direction toward the winding center C of the electrode assembly 10 .
- the uncoated portions 11a and 12a have such a bent shape, the space occupied by the uncoated portions 11a and 12a is reduced, thereby improving energy density.
- an effect of improving bonding strength and reducing resistance may be obtained. Therefore, it is possible to increase the current applied to the battery. Accordingly, the size of the battery may be increased, and high energy density and cost reduction may be realized.
- the secondary battery is a cylindrical secondary battery.
- the secondary battery may include a battery can in which the jelly roll is accommodated.
- the battery can may have a cylindrical shape, and may have a diameter of 30 mm to 55 mm and a height of 60 mm to 120 mm at both ends of the circular shape.
- the circular diameter x height of the cylindrical battery can may be 40 mm x 60 mm, 40 mm x 80 mm, or 40 mm x 90 mm, 40 mm x 120 mm.
- the secondary battery may be a battery cell.
- the cylindrical battery cell is, for example, a cylindrical battery cell with a form factor ratio (defined as the diameter of a cylindrical battery cell divided by its height, i.e., the ratio of its height (H) to its diameter ( ⁇ )) greater than about 0.4.
- a form factor ratio defined as the diameter of a cylindrical battery cell divided by its height, i.e., the ratio of its height (H) to its diameter ( ⁇ )
- the form factor means a value representing the diameter and height of a cylindrical battery cell.
- Cylindrical battery cells may be, for example, 46110 cells, 48750 cells, 48110 cells, 48800 cells, 46800 cells, or 46900 cells.
- the first two numbers indicate the diameter of the cell
- the next two numbers indicate the height of the cell
- the last number 0 indicates that the cross section of the cell is circular.
- a battery cell according to an embodiment of the present invention may be a cylindrical battery cell having a substantially cylindrical shape, a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of 0.418.
- a battery cell according to another embodiment may be a cylindrical battery cell having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of 0.640.
- a battery cell according to another embodiment may be a substantially cylindrical battery cell having a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of 0.418.
- a battery cell according to another embodiment may be a substantially cylindrical battery cell having a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of 0.600.
- a battery cell according to another embodiment may be a cylindrical battery cell having a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of 0.575.
- a battery cell according to another embodiment may be a cylindrical battery cell having a substantially cylindrical shape, a diameter of about 46 mm, a height of about 90 mm, and a form factor ratio of 0.511.
- battery cells having a form factor ratio of approximately 0.4 or less have been used. That is, conventionally, for example, 18650 cells, 21700 cells, etc. have been used. For an 18650 cell, its diameter is approximately 18mm, its height is approximately 65mm, and the form factor ratio is 0.277. For a 21700 cell, its diameter is approximately 21 mm, its height is approximately 70 mm, and the form factor ratio is 0.300.
- Another embodiment of the present invention provides a battery module and a battery pack including the secondary battery according to the above-described embodiment.
- the secondary battery according to the above-described embodiment may be used to manufacture the battery pack.
- 15 is a diagram showing a schematic configuration of a battery pack including the secondary battery of FIG. 6 .
- a battery pack 3 according to an embodiment of the present invention includes an assembly to which secondary batteries 1 are electrically connected and a pack housing 2 accommodating them.
- the secondary battery 1 is a battery cell according to the above-described embodiment.
- parts such as bus bars, cooling units, and external terminals for electrically connecting the cylindrical secondary batteries 1 are omitted.
- the battery pack 3 may be mounted in a vehicle.
- the vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. Vehicles include four-wheeled vehicles or two-wheeled vehicles.
- FIG. 16 is a diagram showing a schematic configuration of a vehicle including the battery pack of FIG. 15 .
- a vehicle 5 according to an embodiment of the present invention includes a battery pack 3 according to an embodiment of the present invention.
- the vehicle 5 operates by receiving power from the battery pack 3 according to an embodiment of the present invention.
- a negative electrode anode current collector: Cu foil, negative electrode active material: 50 parts by weight of each of artificial graphite and natural graphite
- a sheet-type polyethylene separator a cathode (anode current collector: Al foil, active material: LiCoO 2 ) and the polyethylene separator are sequentially laminated
- An electrode assembly was prepared by winding. The diameter of the end perpendicular to the winding axis of the electrode assembly is 45 mm.
- An insulating tape made of polyimide having a notching pattern (notching pattern shape: trapezoidal, flag shape: triangle) was attached to cover the anode uncoated portion exposed to the side surface of the electrode assembly and the end portion of the electrode assembly.
- the insulating tape having the notched pattern includes a portion covering the side surface and a portion covering the end portion of the electrode assembly, each having a length of 7 mm and a thickness of 17.5 ⁇ m (fabric: 12.5 ⁇ m, adhesive layer: 5 ⁇ m). did
- the insulating tapes did not overlap each other.
- the area covered by the insulating tape at the end of the electrode assembly was calculated according to Experimental Example 1 described below, and the insulating tape covered about 26.7% of the positive electrode non-coated area at the end of the electrode assembly.
- a jelly roll was manufactured to include an insulating member (a-shaped insulating member) covering a part of the end and side of the electrode assembly at the end side of the electrode assembly to which the insulating tape was attached.
- ethylene carbonate (EC): ether methyl carbonate (EMC) was mixed at a volume ratio of 30: 70 to obtain LiPF6
- EC ethylene carbonate
- EMC ether methyl carbonate
- An electrode terminal was riveted through a through hole formed in the bottom of the battery can, and a gasket was provided between the electrode terminal and the outer diameter of the through hole to prepare a riveting structure of the electrode terminal, and the jelly in a secondary battery including the same.
- the negative electrode of the roll and the battery can were electrically connected, the positive electrode and the electrode terminal were electrically connected, and the sealing body was prepared to be insulated from the battery can.
- a jelly roll and a secondary battery were manufactured in the same manner as in Example 1, except that an insulating tape having a thickness of 22.5 ⁇ m (fabric: 12.5 ⁇ m, adhesive layer: 10 ⁇ m) having a notched pattern was attached.
- Example except for attaching an insulating tape having a thickness of 30 ⁇ m (fabric: 25 ⁇ m, adhesive layer: 5 ⁇ m) without a notching pattern to cover the side surface of the electrode assembly and at least a portion of the end of the electrode assembly.
- a jelly roll and a secondary battery were prepared in the same manner as in 1.
- a jelly roll and a secondary battery were manufactured in the same manner as in Comparative Example 1, except that an insulating tape having a thickness of 17.5 ⁇ m (fabric: 12.5 ⁇ m, adhesive layer: 5 ⁇ m) without a notching pattern was attached.
- a jelly roll and a secondary battery were manufactured in the same manner as in Comparative Example 1, except that an insulating tape having a thickness of 22.5 ⁇ m (fabric: 12.5 ⁇ m, adhesive layer: 10 ⁇ m) without a notching pattern was attached.
- FIG. 10 is a view showing the ends of the electrode assembly in order to calculate the area covered by the insulating tape on the ends of the electrode assembly.
- the area where the insulating tape covers the first electrode or the second electrode exposed at the end of the electrode assembly or the uncoated portion 11a of the electrode is calculated as follows.
- the diameter (D) of the end portion perpendicular to the winding axis of the electrode assembly, the length (120d) of the portion covering the end portion of the electrode assembly in the insulating tape, and the winding core diameter (Cd) are indicated as follows.
- Notching pattern area ratio (the area of the notching pattern to the total area of the tape) 20 to 80 %
- the area covered by the insulating tape having the notched patterns of Examples 1 and 2 covering the end of the electrode assembly was calculated as follows.
- the adhesive strength of the insulating tape is determined by compressing the adhesive layer of the insulating tape on the SUS304 substrate by reciprocating once with a 2kg rubber roller, leaving it at 23 ° C for 20 minutes, and then removing the backplate film from the colored polyimide at a 180 ° angle and 300 mm / min.
- the peeling rate was measured using a texture analyzer (Stable Micro Systems).
- the lifting degree and lifting confirmation of the jelly roll measured the height of the insulating tape lifted from the end of the electrode assembly, and when the height of the insulating tape lifted from the end of the electrode assembly of the jelly roll was 2 mm or more ⁇ , 1 mm to 2 mm In the case of ⁇ , in the case of 1 mm or less, it was indicated as X, which are shown in Table 1 below.
- the lifting confirmation of Example 1 is shown in FIG. 11, the lifting confirmation of Comparative Example 1 is shown in FIG. 12, and the lifting confirmation of Comparative Example 3 is shown in FIG. 13, respectively.
- the lifting confirmation of Example 2 may be the same as in FIG. 11 even though the degree of lifting compared to Example 1 is not visually distinguished, and the lifting confirmation of Comparative Example 2 is as shown in FIG. 12 and FIG. can be the same
- Example 2 tape notching X X X O O O Fabric thickness ( ⁇ m) 25 12.5 12.5 12.5 12.5 12.5 Adhesive layer thickness ( ⁇ m) 5 5 10 5 10 Adhesion (gf/25mm) (Avg.) 479 457 703 457 703 Lifting degree (mm) 2.5 to 3.0 2 1.0 to 1.5 less than 1 less than 1 check for excitation ⁇ ⁇ ⁇ X X
- Examples 1 and 2 include an insulating tape having a notching pattern according to the present invention, compared to Comparative Examples 1 to 3 including an insulating tape without the notching pattern. It was confirmed that there was little lifting at the end of the electrode assembly of the roll. Therefore, in Examples 1 and 2, compared to Comparative Examples 1 to 3, it is possible to prevent a defect in electrical connection between the electrode tab part and the electrode terminal part by preventing lifting at the end of the electrode assembly.
- Examples 1 and 2 have a difference in the thickness of the insulating tape, especially the thickness of the adhesive layer, and Example 2 has a thickness of the adhesive layer twice as thick as that of Example 1, so the adhesive strength is high and there is little lifting at the end of the electrode assembly. I was able to confirm.
- Comparative Examples 1 and 2 there is a difference in the thickness of the insulating tape, especially the thickness of the fabric layer, and Comparative Example 2 has a fabric thickness of 1/2 that of Comparative Example 1 and has a small adhesive force, but it was confirmed that the lifting degree was improved. As a result, it can be seen that the degree of lifting is improved by using an insulating tape having a thick adhesive layer compared to the thickness of the fabric.
- Example 1 and Comparative Example 2 and Example 2 and Comparative Example 3 each have the same thickness of the fabric and adhesive layer in the insulating tape, but there is a difference only in whether or not they are notched. It can be seen that the lifting of the ends of the electrode assembly is improved in Examples 1 and 2, compared to Comparative Examples 2 and 3, thereby preventing defects in electrical connection between the electrode tab part and the electrode terminal part.
- the insulating tape having the notching pattern can be better attached to the end of the electrode assembly, and specifically, the thinner the thickness of the fabric of the insulating tape, the more advantageous it is, and the thicker the thickness of the adhesive layer of the insulating tape. It can be seen that better sticking is possible at the end of the electrode assembly.
- Example 1 the thickness of the fabric of the insulating tape was reduced by about 50% compared to Comparative Example 1, and the thickness of the adhesive layer was increased by about 150%, that is, the thickness of the fabric of the insulating tape was thin, and the adhesive of the insulating tape It was confirmed that the thickness of the layer was advantageous for adhesion at the end of the electrode assembly.
- the AC resistance of the secondary battery was measured at room temperature using a battery tester (Hioki's battery tester BT3554-51 equipment). In the battery tester, two leads were measured by contacting the positive terminal part (riveted electrode terminal) and the negative terminal part (battery can), respectively.
- AC resistance measurement of a secondary battery is to measure the internal resistance by an alternating current method, and is a method of measuring the battery resistance by applying a minute alternating current signal to the battery. By measuring this, a defect in the electrical connection between the electrode tab part and the electrode terminal part can be indirectly confirmed.
- AC resistance of the secondary batteries according to Examples 1 and 2 and Comparative Examples 1 to 3 was measured 10 times and averaged, and the results are shown in Table 2 and FIG. 14 .
- Example 2 1 time 1.41 1.42 1.39 1.33 1.32 Episode 2 1.36 1.42 1.39 1.34 1.35 3rd time 1.42 1.35 1.33 1.35 1.33 4 times 1.54 1.42 1.39 1.33 1.35 5 times 1.39 1.37 1.34 1.31 1.32 6 times 1.46 1.36 1.34 1.33 1.32 7 times 1.44 1.46 1.42 1.36 1.35 8 times 1.5 1.48 1.44 1.32 1.33 9 times 1.44 1.42 1.39 1.36 1.36 10 times 1.41 1.38 1.35 1.35 1.34 average 1.437 1.408 1.378 1.338 1.337 Standard Deviation 0.053 0.043 0.037 0.017 0.015
- Example 1 includes an insulating tape having a notching pattern according to the present invention and having a relatively thin thickness. Comparative Example 1 including an insulating tape having a relatively thick thickness without having the notching pattern It was confirmed that the contrast AC resistance value was low.
- Comparative Examples 1 and 2 there is a difference in the thickness of the insulating tape, especially the thickness of the fabric layer, and Comparative Example 2 has a fabric thickness of 1/2 that of Comparative Example 1 and has a small adhesive force, but it was confirmed that the AC resistance was improved. From this, it can be seen that the use of an insulating tape having a thick adhesive layer compared to the thickness of the fabric improves the AC resistance.
- Comparative Examples 2 and 3 have higher AC resistance values than Examples 1 and 2, including the insulating tape without a notching pattern, even if the thickness of the fabric and adhesive layer is the same as that of the insulating tape of Examples 1 and 2, respectively. I was able to confirm.
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Abstract
Description
구분 | 비교예 1 | 비교예 2 | 비교예 3 | 실시예 1 | 실시예 2 |
테이프 노칭 | X | X | X | O | O |
원단 두께(㎛) | 25 | 12.5 | 12.5 | 12.5 | 12.5 |
점착층 두께(㎛) | 5 | 5 | 10 | 5 | 10 |
점착력(gf/25mm) (Avg.) | 479 | 457 | 703 | 457 | 703 |
들뜸 정도(mm) | 2.5~3.0 | 2 | 1.0~1.5 | 1 이하 | 1 이하 |
들뜸 확인 | ○ | ○ | △ | Ⅹ | Ⅹ |
구분 | 비교예 1 | 비교예 2 | 비교예 3 | 실시예 1 | 실시예 2 |
1회 | 1.41 | 1.42 | 1.39 | 1.33 | 1.32 |
2 회 | 1.36 | 1.42 | 1.39 | 1.34 | 1.35 |
3 회 | 1.42 | 1.35 | 1.33 | 1.35 | 1.33 |
4 회 | 1.54 | 1.42 | 1.39 | 1.33 | 1.35 |
5 회 | 1.39 | 1.37 | 1.34 | 1.31 | 1.32 |
6 회 | 1.46 | 1.36 | 1.34 | 1.33 | 1.32 |
7 회 | 1.44 | 1.46 | 1.42 | 1.36 | 1.35 |
8 회 | 1.5 | 1.48 | 1.44 | 1.32 | 1.33 |
9 회 | 1.44 | 1.42 | 1.39 | 1.36 | 1.36 |
10 회 | 1.41 | 1.38 | 1.35 | 1.35 | 1.34 |
평균 | 1.437 | 1.408 | 1.378 | 1.338 | 1.337 |
표준 편차 | 0.053 | 0.043 | 0.037 | 0.017 | 0.015 |
Claims (22)
- 제1 전극, 분리막 및 제2 전극이 적층되어 권취된 구조를 갖는 전극 조립체; 및상기 전극 조립체의 측면 중 적어도 일부와 상기 전극 조립체의 단부의 적어도 일부를 덮도록 구비된 절연테이프를 포함하고,상기 절연테이프는 상기 전극 조립체의 단부의 적어도 일부를 덮는 영역에 구비된 적어도 하나의 노칭 패턴을 갖는 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프는 상기 전극 조립체의 단부를 덮는 전체 면적 중 상기 절연테이프끼리 서로 중첩되는 면적이 10% 이하인 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프는 상기 전극 조립체의 단부를 덮는 영역에서 상기 절연테이프끼리 서로 중첩되지 않는 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프는 2 이상의 노칭 패턴을 갖고, 인접한 2개의 노칭 패턴 사이에 구비된 플래그 형상은 사다리꼴, 사각형, 평행사변형, 삼각형 및 반원형 중 적어도 하나인 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프의 노칭 패턴의 형상은 사다리꼴, 사각형, 평행사변형, 삼각형 및 반원형 중 적어도 하나인 것인 젤리롤.
- 청구항 1에 있어서, 상기 제1 전극 및 상기 제2 전극 중 적어도 하나는 집전체 및 상기 접전체 상에 구비된 전극 활물질층을 포함하고, 상기 집전체는 상기 전극 활물질층이 구비되지 않은 무지부를 포함하며,상기 전극 조립체의 측면에 상기 무지부의 적어도 일부가 노출되고,상기 절연테이프는 상기 전극 조립체의 측면의 무지부를 덮도록 구비된 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프는 상기 전극 조립체의 단부에 노출된 상기 제1 전극 또는 상기 제2 전극의 5% 내지 60%를 덮도록 구비된 것인 젤리롤.
- 청구항 6에 있어서, 상기 전극 조립체의 단부에 상기 무지부의 적어도 일부가 노출되고,상기 절연테이프는 상기 전극 조립체의 단부의 무지부의 5% 내지 60%를 덮도록 구비된 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프의 두께는 10 ㎛ 내지 100 ㎛인 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프는 원단 및 점착층을 포함하고,상기 원단의 두께는 3 ㎛ 내지 25 ㎛ 이고, 상기 점착층의 두께는 2 ㎛ 내지 20 ㎛인 것인 젤리롤.
- 청구항 1에 있어서, 상기 절연테이프는 폴리이미드(polyimide), 폴리에틸렌(polyethylene), 폴리프로필렌(polypropylene), 폴리테트라플루오로에틸렌(polytetrafluoroethylene), 폴리에틸렌 테레프탈레이트(polyethylene Terephthalate) 및 폴리부틸렌 테레프탈레이트(polybutylene Terephthalate)로 이루어진 군에서 선택되는 1 이상을 포함하는 것인 젤리롤.
- 청구항 1에 있어서, 상기 전극 조립체의 단부 측에 구비된 집전판을 더 포함하고,상기 집전판은 상기 절연테이프가 상기 전극 조립체의 단부를 덮는 영역에서 상기 절연테이프와 상기 전극 조립체 사이에 위치하거나, 상기 전극 조립체가 상기 절연테이프에 대향하는 면의 반대면인 타단부 측에 위치하는 것인 젤리롤.
- 청구항 1에 있어서, 상기 전극 조립체의 단부측에 상기 전극 조립체의 단부 또는 상기 전극 조립체의 단부의 적어도 일부와 상기 전극 조립체의 측면의 적어도 일부를 덮도록 구비된 절연부재를 더 포함하는 것인 젤리롤.
- 제1 전극, 분리막 및 제2 전극이 적층되어 권취된 구조를 갖는 전극 조립체의 측면 중 적어도 일부 및 전극 조립체의 단부의 적어도 일부를 덮도록 부착하기 위한 절연테이프로서, 적어도 하나의 가장자리부에 적어도 하나의 노칭 패턴을 갖는 것인 절연테이프.
- 청구항 14에 있어서, 상기 절연테이프는 2 이상의 노칭 패턴을 갖고, 인접한 2개의 노칭 패턴 사이에 구비된 플래그 형상은 사다리꼴, 사각형, 평행사변형, 삼각형 및 반원형 중 적어도 하나인 것인 절연테이프.
- 청구항 14에 있어서, 상기 절연테이프의 노칭 패턴의 형상은 사다리꼴, 사각형, 평행사변형, 삼각형 및 반원형 중 적어도 하나인 것인 절연테이프.
- 청구항 1 내지 13 중 어느 한 항에 따른 젤리롤;상기 젤리롤을 수납하는 일측에 개방부를 갖는 전지 캔;상기 전지 캔의 바닥에 형성된 관통 홀을 통해 리벳팅된 전극 단자;상기 전극 단자와 상기 관통 홀의 외경 사이에 구비된 가스켓; 및상기 전지 캔의 개방부를 밀봉하는 밀봉체를 포함하는 것인 이차 전지.
- 청구항 17에 있어서, 상기 이차 전지는 원통형인 것인 이차 전지.
- 청구항 17에 있어서, 상기 제1 전극은 상기 전극 단자와 전기적으로 연결되고, 상기 제2 전극은 상기 전지 캔과 전기적으로 연결되며, 상기 밀봉체는 상기 전지 캔으로부터 절연 가능한 것인 이차 전지.
- 청구항 17에 따른 이차 전지를 포함하는 전지 모듈.
- 청구항 17에 따른 이차 전지를 포함하는 배터리 팩.
- 청구항 21에 따른 배터리 팩을 포함하는 자동차.
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KR20150020888A (ko) * | 2013-08-19 | 2015-02-27 | 주식회사 엘지화학 | 안전성이 개선된 전극 조립체 및 이를 포함하는 이차전지 |
KR20160110610A (ko) * | 2015-03-09 | 2016-09-22 | 주식회사 이아이지 | 이차 전지 및 원통형 리튬 이차 전지 |
KR20180041979A (ko) * | 2016-10-17 | 2018-04-25 | 삼성에스디아이 주식회사 | 이차전지 |
KR20200039214A (ko) * | 2018-10-05 | 2020-04-16 | 주식회사 엘지화학 | 이차전지 |
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