WO2022158858A2 - 배터리, 그리고 이를 포함하는 배터리 팩 및 자동차 - Google Patents
배터리, 그리고 이를 포함하는 배터리 팩 및 자동차 Download PDFInfo
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- WO2022158858A2 WO2022158858A2 PCT/KR2022/001006 KR2022001006W WO2022158858A2 WO 2022158858 A2 WO2022158858 A2 WO 2022158858A2 KR 2022001006 W KR2022001006 W KR 2022001006W WO 2022158858 A2 WO2022158858 A2 WO 2022158858A2
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- battery
- current collector
- battery housing
- electrode assembly
- cover part
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- 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
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- 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
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
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- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- 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
- H01M50/543—Terminals
- H01M50/545—Terminals formed by the casing of the cells
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- 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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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- 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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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- 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
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
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- 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
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
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- 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
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- 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
- H01M50/593—Spacers; Insulating plates
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- 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
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- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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- 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
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- 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 a battery, and to a battery pack and a vehicle including the same. More specifically, the present invention relates to a battery having a structure in which both positive and negative terminals are disposed adjacent to one side of the battery without significantly changing the structure of the conventional battery, and a battery pack and vehicle including the same will be.
- Korean Patent Application No. 10-2021-0142196 filed on October 22, 2021, Korean Patent Application No. 10-2021-0153472, filed on November 9, 2021, November 2021 Korean Patent Application No. 10-2021-0160823 filed on March 19, Korean Patent Application No. 10-2021-0163809 filed on November 24, 2021 Korean Patent filed on November 26, 2021 Application No. 10-2021-0165866, Korean Patent Application No. 10-2021-0172446, filed on December 3, 2021, Korean Patent Application No. 10-2021-0177091, filed on December 10, 2021 No., Korean Patent Application No. 10-2021-0194593, filed on December 31, 2021, Korean Patent Application No. 10-2021-0194610, filed on December 31, 2021, December 31, 2021 Korean Patent Application No. 10-2021-0194572, filed on December 31, 2021, Korean Patent Application No.
- a jelly roll having a shape in which a positive electrode tab and a negative electrode tab are extended vertically along the height direction of the battery housing may be applied in order to maximize current collection efficiency.
- the positive electrode tab and the negative electrode tab protrude from both sides in the height direction of the jelly roll, there is a possibility that the positive electrode tab and the battery housing are in contact with each other. If the battery housing is electrically connected to the negative tab, a short circuit may occur if the positive tab and the battery housing make additional contact. If a short circuit occurs inside the battery, heat generation or explosion of the battery may result. Accordingly, there is a need to provide an insulating member for effectively preventing electrical contact between the positive electrode tab protruding upward and the battery housing.
- an empty space may be formed, particularly between the positive electrode tab and the upper surface of the battery housing or between the positive electrode current collector and the upper surface of the battery housing.
- Such an empty space may cause the jelly roll to move in the interior of the battery housing, particularly in the vertical direction, that is, along the height direction of the battery.
- damage may occur to the bonding portion between the current collector and the uncoated region, and in addition, damage may occur to the bonding portion between the current collector and the battery housing and the bonding portion between the current collector and the terminal. can occur.
- the form factor of the battery is increasing. That is, the diameter and height of the battery are increasing compared to the conventional batteries having a form factor such as 1865 or 2170.
- An increase in the form factor leads to an increase in energy density, increased safety against thermal runaway, and improved cooling efficiency.
- the energy density of a battery can be further increased when the unnecessary space inside the battery housing is minimized with an increase in the form factor. Accordingly, components used for electrical insulation between the electrode assembly and the battery housing need to be optimally designed to increase the capacity of the battery while ensuring electrical insulation.
- the present invention has been devised in consideration of the above-described problems, and an object of the present invention is to reduce the internal resistance of a battery and at the same time effectively prevent an internal short circuit.
- an object of the present invention is to prevent damage to an electrical coupling portion due to movement of an electrode assembly within a battery housing.
- an object of the present invention is to maximize energy density by minimizing unnecessary space inside a battery having a larger form factor than conventional batteries by optimizing the structure of components used for electrical insulation of an electrode assembly.
- a battery according to an embodiment of the present invention for solving the above problems is an electrode assembly defining a core and an outer circumferential surface by winding a first electrode and a second electrode and a separator interposed therebetween around a winding axis,
- One electrode includes a first active material portion coated with an active material layer and a first uncoated portion on which an active material layer is not coated along a winding direction, and at least a portion of the first uncoated portion is itself an electrode assembly used as an electrode tab. ;
- a first current collector coupled to at least a portion of the first uncoated portion at an upper portion of the electrode assembly
- a battery housing accommodating the electrode assembly and the first current collector
- the insulator may include: an end of the first uncoated part facing the inner surface of the battery housing or a first cover part covering the surface of the first current collector; and a second cover part covering the upper end of the outer peripheral surface of the electrode assembly.
- the second cover part may have a shape extending vertically downward from an outer peripheral part of the first cover part.
- the first current collector may be coupled to the first uncoated portion at an upper portion of the electrode assembly and interposed between the first uncoated portion and the insulator.
- the first cover part may cover the surface of the first current collector opposite to the inner surface of the upper end of the battery housing.
- the first cover part may have a thickness corresponding to a distance between the first current collector and an inner surface of the upper end of the battery housing.
- At least a portion of the first uncoated region may be divided into a plurality of segments along a winding direction of the electrode assembly.
- the plurality of fragments may be bent along a radial direction of the electrode assembly.
- the plurality of fragments may be overlapped in multiple layers along a radial direction of the electrode assembly.
- the insulator may include a curved surface formed by bending a plurality of segments of the first uncoated portion facing the inner surface of the battery housing or a first cover portion interposed between the first current collector and the inner surface of the battery housing. ; and a second cover part covering the upper end of the outer peripheral surface of the electrode assembly.
- the first current collector may be coupled to the bent surface at an upper portion of the electrode assembly and interposed between the bent surface and the insulator.
- the first cover part may cover a surface of the first current collector opposite to an inner surface of the upper end of the battery housing.
- the first cover part may have a thickness corresponding to a distance between the first current collector and an inner surface of the upper end of the battery housing.
- the second cover part may cover the entire exposed side part of the first uncoated part so that the first uncoated part is not exposed toward the inner circumferential surface of the battery housing.
- an extension length of the second cover part may be greater than or equal to an extension length of the first uncoated part.
- an extension length of the second cover part may be greater than or equal to a length from a lower end point of a cutting line between the plurality of segment pieces to a bending point of the plurality of segment segments.
- the lower end of the second cover part may be located further lower than the lower end of the first uncoated part.
- the insulator may include an insulating polymer material.
- the insulator may be made of a material having elasticity.
- the insulator may include a center hole having a predetermined diameter in the center of the first cover part.
- the center of the first current collector may be positioned on the same line as the winding center of the electrode assembly.
- a diameter of the first current collector may be smaller than or equal to a diameter of the central hole of the insulator.
- a diameter of the first current collector may be greater than a diameter of a winding center hole of the electrode assembly.
- the first cover part may have a thickness corresponding to a distance between an end of the first uncoated part and an inner surface of the upper end of the battery housing.
- At least some sections of the first uncoated region may be divided into a plurality of segments along a winding direction of the electrode assembly.
- the plurality of fragments may be bent along a radial direction of the electrode assembly.
- the plurality of fragments may be overlapped in multiple layers along a radial direction of the electrode assembly.
- the first cover part may be interposed between a bent surface formed by bending a plurality of segments of the first uncoated part opposite to the inner surface of the upper end of the battery housing and an inner surface of the upper end of the battery housing. .
- the first cover part may have a thickness corresponding to a distance between the bent surface and an inner surface of the upper end of the battery housing.
- the battery may further include a terminal electrically connected to the first uncoated region and exposed to the outside through a through hole formed at an upper end of the battery housing at least in part.
- the terminal may include a body part inserted into the through hole; an outer flange portion extending along the outer surface from the periphery of one side of the body portion exposed through the outer surface of the upper end of the battery housing; an inner flange portion extending toward the inner surface from the periphery of the other side of the body portion exposed through the inner surface of the upper end of the battery housing; and a flat portion provided inside the inner flange portion.
- the inner surface of the flat portion and the upper end of the battery housing may be parallel to each other.
- the flat portion and the first current collector may be parallel to each other.
- the body portion, the inner flange portion, and the flat portion of the terminal may be inserted into the battery housing through the through hole.
- the inner flange portion may be fixed by riveting toward the inner surface of the upper end of the battery housing.
- the diameter of the central hole of the insulator may be greater than or equal to the diameter of the body portion.
- the diameter of the center hole of the insulator may be greater than or equal to the diameter of the inner flange portion.
- the body portion of the terminal may pass through the center hole of the insulator.
- the flat portion of the terminal may pass through the central hole of the insulator to be electrically coupled to the first current collector.
- the flat portion of the terminal may be welded to the first current collector.
- the battery may further include an insulating gasket interposed between the battery housing and the terminal to block the electrical connection between the battery housing and the terminal.
- the insulating gasket may be integrally formed by being connected to the insulator.
- a side spacer that covers at least a portion of the outer circumferential surface of the electrode assembly and contacts the inner circumferential surface of the battery housing may further include.
- the side spacer may cover at least a portion of an outer circumferential surface of the electrode assembly along an outer circumference of the electrode assembly.
- the side spacer may have a thickness corresponding to a distance between an outer circumferential surface of the electrode assembly and an inner circumferential surface of the battery housing.
- the side spacer may be integrally formed by being connected to the insulator.
- the side spacer may include an insulating polymer material.
- the side spacer may be made of a material having elasticity.
- the second electrode includes a second active material portion coated with an active material layer and a second uncoated portion on which an active material layer is not coated along a winding direction, and at least a portion of the second uncoated portion. can be used as an electrode tab as such.
- the battery may further include a second current collector coupled to the second uncoated region under the electrode assembly.
- the battery housing may include: a beading portion formed at an end adjacent to an opening formed at the bottom and press-fitted toward the inside; and a crimping part formed on a side facing the opening part rather than the beading part and extending and bent toward the opening part.
- the second current collector may include: at least one tab coupling part coupled to the second uncoated part; and at least one housing coupling part electrically coupled to the beading part of the inner surface of the battery housing.
- the housing coupling part may be press-fixed by the crimping part.
- the housing coupling portion may be welded to the beading portion.
- the battery may further include a cap covering the opening of the battery housing.
- the battery interposed between the cap and the second current collector, a lower spacer configured to prevent the electrode assembly from flowing; may further include.
- the lower spacer may have a height corresponding to a distance between the second current collector and the cap.
- the lower spacer may include an insulating polymer material.
- the lower spacer may be made of a material having elasticity.
- a thickness of the first cover part may be different from a thickness of the second cover part.
- a thickness of the second cover part may be smaller than a thickness of the first cover part.
- the first cover part may include a round part having a predetermined radius of curvature in the outer periphery of the first cover part.
- the round part may be formed at an intersection point between an upper surface of the first cover part and a side surface of the second cover part.
- the radius of curvature of the round part may be smaller than or equal to a radius of curvature formed at the intersection of the inner surface of the upper end of the battery housing and the side surface of the battery housing.
- the round part may be in close contact with the inner surface of the battery housing without a gap.
- first cover part and the second cover part may be integrally formed.
- first cover part and the second cover part may be separately formed and combined.
- the insulating gasket, the gasket exposed portion interposed between the outer flange portion and the battery housing; and a gasket insertion part interposed between the inner flange part and the battery housing.
- the thickness of the gasket exposed portion and the gasket insertion portion may vary according to positions.
- a plurality of holes having a smaller diameter than the central hole may be further formed around the central hole of the first cover part.
- the battery pack according to an embodiment of the present invention the battery according to an embodiment of the present invention as described above; and a pack housing accommodating a plurality of the batteries.
- a vehicle according to an embodiment of the present invention includes the battery pack according to an embodiment of the present invention as described above.
- a battery structure having a structure in which a positive terminal and a negative terminal are applied in the same direction, and thus the electrical connection structure of a plurality of batteries can be simplified.
- the movement of the electrode assembly in the battery housing is minimized, thereby preventing damage to the electrical coupling portion.
- the electrode terminal of the battery has a sufficient area to be welded to the electrical connection part such as a bus bar, it is possible to sufficiently secure the bonding strength between the electrode terminal and the electrical connection part, and the electrical connection part and The resistance at the joint portion of the electrode terminal can be lowered to a desirable level.
- FIG. 1 is a view for explaining a battery according to an embodiment of the present invention.
- FIG. 2 is a longitudinal cross-sectional view of the battery of FIG. 1 .
- FIG. 3 is a perspective view illustrating the inside of the battery of FIG. 1 .
- FIG. 4 is a cross-sectional view for explaining the inside of the battery of FIG. 1 .
- 5A is a view for explaining a battery according to an embodiment of the present invention.
- 5B to 5E are diagrams for explaining a battery according to another embodiment of the present invention.
- 6 to 7 are views for explaining a battery according to another embodiment of the present invention.
- FIGS. 8 and 9 are diagrams for explaining a battery according to another embodiment of the present invention.
- FIG. 10 is a view for explaining a battery pack including the battery of FIG. 1 .
- FIG. 11 is a view for explaining a vehicle including the battery pack of FIG. 10 .
- substantially identical may include deviations considered to be low in the art, for example, deviations within 5%. Also, uniformity of a certain parameter in a predetermined region may mean uniformity in terms of an average.
- first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, the first component may be the second component, of course.
- top (or bottom) of a component or “top (or below)” of a component means that any component is disposed in contact with the top (or bottom) surface of the component, as well as , may mean that other components may be interposed between the component and any component disposed on (or under) the component.
- each component when it is described that a component is “connected”, “coupled” or “connected” to another component, the components may be directly connected or connected to each other, but other components are “interposed” between each component. It is to be understood that “or, each component may be “connected”, “coupled” or “connected” through another component.
- a direction along the longitudinal direction of the winding axis of the electrode assembly wound in a wound shape is referred to as an axial direction (Y).
- the direction surrounding the winding shaft is referred to as a circumferential direction or a circumferential direction (X).
- a direction close to or away from the take-up shaft is referred to as a radial direction.
- a direction closer to the take-up shaft is referred to as a centripetal direction
- a direction away from the take-up shaft is referred to as a centrifugal direction.
- the battery 1 includes an electrode assembly 10, a battery housing 20, a first current collector 30, and an insulator ( 40).
- the electrode assembly 10 includes a first electrode having a first polarity, a second electrode having a second polarity, and a separator interposed between the first electrode and the second electrode.
- the first electrode is an anode or a cathode
- the second electrode corresponds to an electrode having a polarity opposite to that of the first electrode.
- the electrode assembly 10 may have, for example, a winding shape. That is, the electrode assembly 10 includes a first electrode, a second electrode, and a stack formed by stacking a separator interposed between the first electrode and the second electrode at least once based on the winding center (C). It can be manufactured by winding. In this case, an additional separator may be provided on the outer circumferential surface of the electrode assembly 10 to insulate it from the battery housing 20 .
- the electrode assembly 10 may have a winding structure well known in the related art without limitation.
- the first electrode includes a first electrode current collector and a first active material portion coated on one or both surfaces of the first electrode current collector.
- An uncoated region to which the first active material portion is not applied is provided at one end of the first electrode current collector in the width direction (parallel to the Z-axis).
- the uncoated region itself functions as a first electrode tab.
- the first uncoated region 11 is provided above the electrode assembly 10 accommodated in the battery housing 20 in the height direction (parallel to the Z-axis).
- the second electrode includes a second electrode current collector and a second active material portion coated on one or both surfaces of the second electrode current collector.
- An uncoated region to which the second active material portion is not applied is provided at the other end of the second electrode current collector in the width direction (parallel to the Z-axis).
- the uncoated region itself functions as a second electrode tab.
- the second uncoated region 12 is provided below the electrode assembly 10 accommodated in the battery housing 20 in the height direction (parallel to the Z-axis).
- the electrode assembly 10 may be an electrode assembly 10 in which the first electrode and the second electrode and a separator interposed therebetween are wound around a winding axis to define a core and an outer circumferential surface.
- the first electrode includes a first active material portion coated with an active material layer and a first uncoated portion on which an active material layer is not coated along a winding direction, and at least a portion of the first uncoated portion is an electrode tab itself.
- the second electrode includes a second active material portion coated with an active material layer and a second uncoated portion 12 not coated with an active material layer along the winding direction, and At least some of them may be used as electrode tabs as such.
- the electrode assembly 10 is a winding type electrode assembly 10 having a structure in which a first electrode current collector and a second electrode current collector having a sheet shape and a separator interposed therebetween are wound in one direction.
- the first electrode current collector may include a first uncoated region 11 on which an active material layer is not coated on a long side end, and at least a portion of the first uncoated region 11 may be used as an electrode tab by itself.
- the second electrode current collector may include a second uncoated region 12 on which an active material layer is not coated on a long side end, and at least a portion of the second uncoated region 12 may be used as an electrode tab by itself.
- the electrode assembly 10 may be a winding type in which the first uncoated area 11 and the second uncoated area 12 having different polarities protrude in opposite directions. That is, the first uncoated area 11 and the second uncoated area 12 are opposite to each other along the width direction of the electrode assembly 10 , that is, the height direction (parallel to the Z axis) of the battery 1 . It can be extended and protruded.
- the positive 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 the active material is known in the art.
- the positive 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, 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; stoichiometric coefficients x, y and z are selected such that the compound remains electrically neutral).
- the positive active material includes an alkali metal compound xLiM 1 O 2 (1x)Li 2 M 2 O 3 (M 1 comprising at least one element having an average oxidation state 3; M; 2 includes at least one element having an average oxidation state 4; 0 ⁇ x ⁇ 1).
- the positive active material may have the general formula Li a M 1 x Fe 1x M 2 y P 1y M 3 z O 4z (M 1 is Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, At least one element selected from 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, contains at least one element selected from V and S; M 3 contains a halogen element optionally including F; 0 ⁇ a ⁇ 2, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1; stoichiometric coefficients a, x, y and z are chosen such that the compound remains electrically neutral), or Li 3 M 2 (PO 4 ) 3 [M is Ti, Si, Mn, Fe, Co, V, Cr , Mo, Ni, Al, including at least one element selected from Mg
- the positive electrode active material may include primary particles and/or secondary particles in which the primary particles are aggregated.
- the negative active material may be a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound.
- a metal oxide having a potential of less than 2V, such as TiO 2 and SnO 2 may also be used as the negative electrode active material.
- As the carbon material both low-crystalline carbon, high-crystalline carbon, and the like may be used.
- the separator is a porous polymer film, for example, a porous polymer film made of a polyolefin-based polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, or an ethylene/methacrylate copolymer. Or they can be used by laminating 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, 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 formed of an inorganic material having a dielectric constant of 5 or more.
- the inorganic particles are Pb(Zr,Ti)O 3 (PZT), Pb 1x La x Zr 1y Ti y O 3 (PLZT), PB(Mg 3 Nb 2/3 )O 3 PbTiO 3 ( PMNPT), 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 At least one selected from the group consisting of material may be included.
- the electrolyte may be a salt having a structure such as A + B -- .
- a + includes an ion composed of an alkali metal cation such as Li + , Na + , K + or 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 CF 2 SO 3 -- , (CF 3 SO 2 ) 2 N -- , (F
- 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 (N-methyl- 2-pyrrolidone, NMP), ethyl methyl carbonate (EMC), gamma butyrolactone ( ⁇ -butyrolactone), or a mixture thereof may be used.
- PC propylene carbonate
- EC ethylene carbonate
- DEC diethyl carbonate
- DMC dimethyl carbonate
- DPC dipropyl carbonate
- dimethyl sulfoxide acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofur
- the first uncoated region 11 may be divided into a plurality of segments along the winding direction of the electrode assembly 10 .
- the fragments have a trapezoidal shape, a square shape, a flat quadrilateral shape, a semicircle shape, a semielliptical shape, and the like, and may be repeatedly arranged at predetermined intervals along the winding direction.
- the width of the lower part of the segment may be greater than the width of the upper part, and the width may gradually and/or stepwise increase from the lower part to the upper part (ie, going in the z direction of FIG. 2 ).
- the plurality of fragments may be bent along a radial direction of the electrode assembly 10 .
- the radial direction means a direction toward the core of the electrode assembly 10 or a direction toward the outer periphery of the electrode assembly 10 .
- the plurality of fragments may be bent toward the core.
- the plurality of fragments may have a structure overlapping multiple layers.
- the plurality of segment pieces may be overlapped in multiple layers along a radial direction of the electrode assembly 10 .
- the plurality of fragments may be notched with a laser.
- the fragment may be formed by a known metal foil cutting process such as ultrasonic cutting or punching.
- the gap is preferably 0.2 to 4 mm.
- the gap may prevent damage to the active material layer due to tolerances during notching or cutting of the fragment.
- the bending direction of the first uncoated region 11 may be, for example, a direction toward the winding center C of the electrode assembly 10 .
- the space occupied by the first uncoated area 11 may be reduced, thereby improving energy density.
- an additional coupling force improvement and an additional resistance reduction effect may be obtained.
- first uncoated area 11 Although only the bending and overlapping of the first uncoated area 11 have been described above, it goes without saying that the same structure as the first uncoated area 11 may also be applied to the second uncoated area 12 .
- the battery housing 20 may accommodate the electrode assembly 10 and the first current collector 30 .
- the battery housing 20 is a substantially cylindrical container having an opening formed at the bottom, and may be made of, for example, a material having conductivity such as metal.
- the material of the battery housing 20 may be, for example, aluminum, steel, stainless steel, nickel, or the like.
- the bottom portion of the battery housing 20 provided with the open portion will be referred to as an open end.
- the side surface (outer peripheral surface) and the upper surface of the battery housing 20 may be integrally formed.
- An upper surface (a surface parallel to the X-Y plane) of the battery housing 20 has an approximately flat shape.
- An upper surface positioned opposite to the open portion (or open end) will be referred to as a closed portion.
- the battery housing 20 accommodates the electrode assembly 10 through an opening formed below, and also accommodates the electrolyte.
- the battery housing 20 is electrically connected to the electrode assembly 10 .
- the battery housing 20 is electrically connected to, for example, the second uncoated region 12 of the electrode assembly 10 .
- the battery housing 20 has the same polarity as the second uncoated region 12 .
- the battery housing 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 portion 21 is formed by press-fitting the outer peripheral surface of the battery housing 20 .
- the beading part 21 may be formed at an end adjacent to an opening formed at the bottom and press-fitted inwardly.
- the beading portion 21 prevents the electrode assembly 10 , which may have a size substantially corresponding to the inner diameter of the battery housing 20 , from escaping through the opening formed at the bottom of the battery housing 20 , and the cap 90 ) can function as a support on which it is seated.
- the crimping part 22 is formed under the beading part 21 .
- the crimping portion 22 may be formed on a side facing the open portion rather than the beading portion 21 and may be extended and bent toward the open portion.
- the crimping part 22 has an extended and bent shape to surround at least a portion of the outer peripheral surface of the cap 90 disposed below the beading part 21 and at least a portion of the lower surface of the cap 90 .
- the present invention does not exclude a case in which the battery housing 20 does not include the beading portion 21 and/or the crimping portion 22 . That is, in the present invention, when the battery housing 20 does not include the beading portion 21 and/or the crimping portion 22 , the fixing of the electrode assembly 10 and/or sealing of the battery housing 20 is, For example, it can be realized through the additional application of a component that can function as a stopper for the electrode assembly 10 . In addition, if the battery 1 of the present invention includes the cap 90, the fixing of the electrode assembly 10 and/or sealing of the battery housing 20, for example, the cap 90 can be seated. It can be realized through additional application of the structure and/or welding between the battery housing 20 and the cap 90 . For example, published patent KR 10-2019-0030016 A of the present applicant discloses a battery in which a beading part is omitted, and such a structure may be employed in the present invention.
- the first current collector 30 may be coupled to an upper portion of the electrode assembly 10 .
- the first current collector 30 may be coupled to the first uncoated region 11 at an upper portion of the electrode assembly 10 .
- the first current collector 30 may be interposed between the first uncoated region 11 and the insulator 40 .
- the first current collector 30 is coupled to the first uncoated region 11 at an upper portion of the electrode assembly 10 , and is disposed between the first uncoated region 11 and the insulator 40 . may be interposed in
- the first current collector 30 may be made of a conductive metal material.
- the first current collector 30 may include a plurality of radially formed irregularities on a lower surface thereof. When the unevenness is formed, the unevenness may be press-fitted into the first uncoated region 11 by pressing the first current collector 30 .
- the battery 1 according to another embodiment of the present invention may not include the first current collector 30 .
- the first uncoated region 11 may be directly electrically connected to the terminal 50 .
- the first current collector 30 may be coupled to an end of the first uncoated region 11 .
- the coupling between the first uncoated region 11 and the first current collector 30 may be performed, for example, by laser welding.
- the laser welding may be performed by partially melting the base material of the first current collector 30 , and optionally by interposing a solder for welding between the first current collector 30 and the first uncoated region 11 . It can be done in the state.
- the solder preferably has a lower melting point than that of the first current collector 30 and the first uncoated region 11 .
- resistance welding, ultrasonic welding, spot welding, etc. are possible, but the welding method is not limited thereto.
- the first current collector 30 may be coupled to a bonding surface formed by bending an end of the first uncoated region 11 in a direction parallel to the first current collector 30 .
- the bending direction of the first uncoated region 11 may be, for example, a direction toward the winding center C of the electrode assembly 10 .
- the space occupied by the first uncoated area 11 may be reduced, thereby improving energy density.
- due to an increase in the bonding area between the first uncoated region 11 and the first current collector 30 it is possible to bring about an effect of improving the bonding force and reducing the resistance at the bonding surface.
- the insulator 40 blocks the electrical connection between the first uncoated area 11 and the battery housing 20, and the first uncoated area 11 or the second uncoated area
- a first current collector 30 may be interposed between the opposite inner surface of the battery housing 20 and the first uncoated portion 11 or the first current collector 30 .
- the insulator 40 may include a first current collector 30 and a battery housing coupled between the top of the electrode assembly 10 and the inner surface of the battery housing 20 or on the top of the electrode assembly 10 20) may be provided between the inner surfaces. The insulator 40 prevents contact between the first uncoated region 11 and the battery housing 20 and/or between the first current collector 30 and the battery housing 20 .
- the insulator 40 is accommodated in the battery housing 20 , covers at least a portion of the electrode assembly 10 , and is disposed between the first uncoated region 11 and the battery housing 20 . configured to break the electrical connection.
- the insulator 40 may be made of a material having insulating performance.
- the insulator 40 may include an insulating polymer material.
- the insulator 40 may include a first cover part 41 and a second cover part 42 .
- the second cover part 42 may have a shape extending vertically downward from the outer periphery of the first cover part 41 . That is, the second cover part 42 means a portion extending in the vertical direction (parallel to the Z-axis) from the outer edge of the first cover part 41 . Accordingly, the first cover part 41 and the second cover part 42 may have a cup shape.
- the first cover part 41 refers to all parts of the insulator 40 other than the second cover part 42 . For example, in FIGS. 2 to 5A , the first cover part 41 refers to a portion of the insulator 40 extending in the horizontal direction (a direction parallel to the X-Y plane).
- the first cover part 41 may cover an end of the first uncoated part 11 facing the inner surface of the battery housing 20 or a surface of the first current collector 30 .
- the first cover part 41 may cover the surface of the first current collector 30 facing the inner surface of the upper end of the battery housing 20 .
- the insulator 40 may include a central hole having a predetermined diameter at the center of the first cover part 41 .
- the insulator 40 may have a center hole adjacent to the winding center C.
- the first cover part 41 may have an approximately circular center hole adjacent to the winding center C. Due to the existence of the central hole, the terminal 50 may be in a state in which it can contact the first current collector 30 or the first uncoated region 11 .
- a plurality of holes having a smaller diameter than the central hole may be further formed around the central hole of the first cover part 41 .
- a plurality of holes may be formed around the center hole of the first cover part 41 so that the electrolyte can move.
- the insulator 40 may be disposed to be placed on the bottom. That is, the electrolyte may be injected into the battery housing 20 in a state in which the battery 1 of FIG. 2 is vertically inverted, that is, the terminal 50 is positioned at the lower side.
- the electrolyte moves downward through the center hole provided in the first cover part 41 of the insulator 40, moves horizontally through the surface of the first cover part 41, and can move upward through the plurality of holes. have. Accordingly, the electrolyte may be provided to the electrode assembly 10 as a whole. That is, when the plurality of holes are formed in the first cover part 41 of the insulator 40 as described above, the electrolyte can be smoothly and easily provided to the electrode assembly 10 .
- the plurality of holes may be spaced apart from each other at preset intervals.
- a plurality of holes may be disposed on any one straight line from the center of the insulator 40 toward the outer circumferential surface of the insulator 40 .
- the first cover part 41 may be connected to the second cover part 42 .
- the first cover part 41 may be integrally formed with the second cover part 42 .
- the first cover part 41 and the second cover part 42 may be an integrally molded polymer molded body.
- the first cover part 41 and the second cover part 42 may be separately formed and combined.
- the first cover part 41 and the second cover part 42 may be a polymer structure that is separately molded and combined.
- the thickness of the first cover part 41 may be different from the thickness of the second cover part 42 .
- the thickness of the second cover part 42 may be smaller than the thickness of the first cover part 41 .
- the first uncoated region 11 positioned on the outer periphery of the electrode assembly 10 may be omitted. Accordingly, a predetermined space may be formed at the upper end of the outer periphery of the electrode assembly 10 , which is a region where the first uncoated region 11 is omitted. Accordingly, electrical contact between the first uncoated region 11 and the battery housing 20 may be primarily prevented by the predetermined space.
- the second cover part 42 may be provided to ensure more reliable insulation. In this case, even if the thickness of the second cover part 42 is smaller than the thickness of the first cover part 41 , insulation performance may be sufficiently secured. Furthermore, by forming the thickness of the second cover part 42 to be smaller than the thickness of the first cover part 41 , the space occupied by the insulator 40 may be minimized.
- the first cover part 41 may include a round part R having a predetermined radius of curvature at the outer periphery of the first cover part 41 .
- the round part R may be formed at an intersection point between the upper surface of the first cover part 41 and the side surface of the second cover part 42 .
- the radius of curvature of the round part R may be less than or equal to the radius of curvature formed at the intersection of the inner surface of the upper end of the battery housing 20 and the side surface of the battery housing 20 .
- the round portion (R) can be in close contact with the inner surface of the battery housing 20 without a gap.
- the movement of the electrode assembly 10 within the battery housing 20 is minimized, thereby preventing damage to the electrical coupling portion.
- the round part A space may be formed between (R) and the inner surface of the battery housing 20 .
- the battery 1 of the present invention may not include the first current collector 30 .
- the insulator 40 includes a first cover part 41 that covers an end of the first uncoated part 11 and a second cover part 42 that covers an upper end of an outer peripheral surface of the electrode assembly 10 . ) may be included.
- the first cover part 41 may be located in a space between the end of the first uncoated part 11 and the inner surface of the upper end of the battery housing 20 .
- the first cover part 41 of the insulator 40 has a thickness corresponding to the distance between the end of the first uncoated part 11 and the inner surface of the upper end of the battery housing 20 . can Accordingly, the first cover part 41 can completely fill the space between the end of the first uncoated part 11 and the inner surface of the upper end of the battery housing 20 . Accordingly, even when vibration and external shock are applied to the battery 1 , the movement of the electrode assembly 10 within the battery housing 20 is minimized, thereby preventing damage to the electrical coupling portion.
- the insulator 40 may have a thickness of about 0.1 mm or more. This is because, if the insulator 40 is too thin, insulation may deteriorate. In another aspect, this is because it may be difficult to achieve in the process that the thickness of the insulator 40 is formed to be less than or equal to a specific thickness.
- the upper limit of the thickness of the insulator 40 is the distance between the inner surface of the battery housing 20 and the first uncoated region 11 or the inner surface of the battery housing 20 and the first current collector 30 . It may be a thickness corresponding to the distance between them. If the insulator 40 is too thick, it occupies a large amount of space inside the battery housing 20, thereby reducing the capacity of the battery cell and increasing the cost.
- the thickness of the insulator 40 may be set within an appropriate range so that the capacity of the battery cell is not reduced while maintaining proper insulation.
- the thickness of the insulator 40 is not limited to the above range, and it is possible to secure insulation and minimize the movement of the electrode assembly 10 within the battery housing 20 to prevent damage to the electrical coupling site. If it is a range, it is included in the scope of the present invention.
- the insulator 40 is a first cover part that covers at least a part of the first current collector 30 . (41) and a second cover part 42 covering the upper end of the outer peripheral surface of the electrode assembly 10 may be included. That is, the first cover part 41 may cover at least a portion of the first current collector 30 .
- the first cover part 41 may cover all regions of the upper surface of the first current collector 30 , except for some regions located in the center. Also, the first cover part 41 may cover a partial area of the first uncoated part 11 that is not covered by the first current collector 30 .
- the first cover part 41 of the insulator corresponds to the distance between the first current collector 30 and the inner surface of the upper end of the battery housing 20 .
- At least a partial section of the first uncoated region 11 may be divided into a plurality of segments.
- the plurality of fragments may be bent toward the core.
- the plurality of fragments may have a structure overlapping multiple layers along the radial direction.
- the plurality of segments of the first uncoated region 11 may be bent and overlapped to form one bent surface.
- the bent surface may be substantially parallel to the upper surface of the battery housing.
- the first cover part 41 may cover a curved surface formed by bending a plurality of segments of the first uncoated part 11 .
- the second cover part 42 may cover the upper end of the outer peripheral surface of the electrode assembly 10 . Referring to FIG.
- the first current collector 30 is coupled on the bent surface of the plurality of segment pieces at the top of the electrode assembly 10 and is interposed between the bent surface and the battery housing 20.
- the area may be formed to be relatively small compared to the area of the upper surface of the electrode assembly 10 .
- a diameter of the first current collector 30 may be smaller than or equal to a diameter of the central hole of the insulator 40 .
- a diameter of the first current collector 30 may be greater than a diameter of a winding center hole of the electrode assembly 10 . Since the diameter of the first current collector 30 is larger than the diameter of the winding center hole of the electrode assembly 10 , the first current collector 30 may be supported on the electrode assembly 10 .
- the center of the first current collector 30 may be located on the same line as the winding center of the electrode assembly 10 . Accordingly, the first current collector 30 and the terminal 50 may be maintained in contact with each other so that they can be welded to each other later. Meanwhile, the plurality of segment pieces of the first uncoated region 11 may be bent to overlap each other along the radial direction of the electrode assembly 10 . Accordingly, the electrode assembly 10 may have current collecting performance in the bent surface due to the overlapping of the plurality of fragments. Furthermore, since at least a portion of the bent surface and the first current collector 30 are electrically coupled, the electrode assembly 10 is electrically connected to the terminal 50 through the first current collector 30 . can be connected Meanwhile, as shown in FIG. 5D , an embodiment in which only the first uncoated region 11 is not bent in the embodiment of FIG. 5E may be employed in the present invention.
- the first cover part 41 may have a thickness corresponding to the distance between the bent surfaces of the plurality of segments and the inner surface of the upper end of the battery housing 20. . Accordingly, the first cover part 41 can completely fill the space between the bent surface and the inner surface of the upper end of the battery housing 20 .
- the first cover part 41 is bent formed by bending a plurality of segments of the first uncoated part 11 facing the inner surface of the upper end of the battery housing 20 . It may be interposed between the surface and the inner surface of the upper end of the battery housing 20 . Meanwhile, referring to FIG.
- the first cover part may be interposed between the first current collector 30 and the inner surface of the upper end of the battery housing 20 .
- the first cover part 41 may have a thickness corresponding to the distance between the first current collector 30 and the inner surface of the upper end of the battery housing 20 .
- the plurality of segment pieces are coupled on the bent surface of the electrode assembly 10 at the top of the electrode assembly 10 , and between the bent surface and the battery housing 20 .
- An area of the first current collector 30 interposed therebetween may be substantially similar to an area of an upper surface of the electrode assembly 10 .
- the first cover part 41 may cover the first current collector 30 .
- the first cover part 41 may have a thickness corresponding to the distance between the first current collector 30 and the inner surface of the upper end of the battery housing 20 . Accordingly, the first cover part 41 can completely fill the space between the first current collector 30 and the inner surface of the upper end of the battery housing 20 . Accordingly, even when vibration and external shock are applied to the battery 1 , the movement of the electrode assembly 10 within the battery housing 20 is minimized, thereby preventing damage to the electrical coupling portion.
- the second cover part 42 may cover the upper end of the outer peripheral surface of the electrode assembly 10 .
- the second cover part 42 may cover the side surface of the first uncoated part 11 .
- the second cover part 42 includes the exposed outermost part of the first uncoated part 11 so that the first uncoated part 11 is not exposed toward the inner circumferential surface of the battery housing 20 . It can cover the entire side part. Accordingly, electrical contact between the battery housing 20 and the first uncoated region 11 having a polarity opposite to that of the first uncoated region 11 may be reliably prevented. Therefore, according to the present invention, an internal short circuit of the battery 1 can be effectively prevented.
- the extension length of the second cover part 42 may be greater than or equal to the extension length of the first uncoated part 11 .
- the extension length of the second cover part 42 should be the same as the extension length of the first uncoated part 11 , and for reliable insulation, the extension length of the second cover part 42 should be the same as the extension length of the first uncoated part 11 . It is preferable to be formed to be even slightly longer than the extended length of (11).
- the extension length of the second cover part 42 is It may be configured to be greater than or equal to the length from the lower end of the cutting line between the fragments to the bending point of the plurality of fragments.
- the lower end of the second cover part 42 may be located further lower than the lower end of the first uncoated part 11 . According to this structure, the second cover part 42 can reliably prevent electrical contact between the side surface of the first uncoated part 11 and the battery housing 20 .
- the terminal 50 may be electrically connected to the first uncoated region 11 of the electrode assembly 10 . That is, the terminal 50 may be made of a conductive metal material. The terminal 50 may be electrically connected to the first uncoated region 11 , and at least a portion of the terminal 50 may be exposed to the outside through a through hole formed at the upper end of the battery housing 20 . The terminal 50 may pass through, for example, a substantially central portion of a closure formed at the top of the battery housing 20 . That is, the battery housing 20 may include a through hole in the closing portion provided above the battery housing 20 . The terminal 50 may be inserted into the battery housing 20 through the through hole.
- the body portion 50a, the inner flange portion 50c, and the flat portion 50d of the terminal 50 may be inserted into the battery housing 20 through the through hole. Accordingly, a portion of the terminal 50 may be exposed to the upper portion of the battery housing 20 , and the remaining portion may be located inside the battery housing 20 .
- the terminal 50 may be riveted through the through hole.
- the terminal 50 may be fixed by being riveted toward the inner surface of the upper end of the battery housing 20 .
- the inner flange portion 50c of the terminal 50 may be fixed on the inner surface of the closing portion of the battery housing 20 by, for example, riveting.
- the terminal 50 may pass through the insulator 40 to be coupled to the first current collector 30 or the first uncoated region 11 .
- the terminal 50 may be coupled to the first current collector 30 or the first uncoated region 11 through a central hole provided in the insulator 40 .
- the diameter of the center hole of the insulator 40 may be greater than or equal to the diameter of the inner flange portion 50c, which will be described later.
- the flat portion 50d of the terminal 50 may pass through the central hole of the insulator 40 to be electrically coupled to the first current collector 30 .
- the terminal 50 may have a first polarity. More preferably, the flat portion 50d of the terminal 50 may be welded to the first current collector 30 .
- welding may be performed between the flat portion 50d provided inside the inner flange portion 50c and the first current collector 30 .
- the flat portion 50d may be provided at a lower end of the terminal 50 .
- the flat portion 50d and inner surfaces of the upper end of the battery housing 20 may be parallel to each other. Accordingly, the flat portion 50d and the first current collector 30 may be parallel to each other.
- Laser welding may be employed as the welding method. In addition to laser welding, resistance welding, ultrasonic welding, etc. are possible, but the welding method is not limited thereto.
- the terminal 50 can function as a first electrode terminal in the battery 1 of the present invention.
- the terminal 50 When the terminal 50 has the first polarity as described above, the terminal 50 is electrically insulated from the battery housing 20 having the second polarity. Electrical insulation between the terminal 50 and the battery housing 20 may be realized in various ways. For example, insulation may be realized by interposing an insulating gasket 60 , which will be described later, between the terminal 50 and the battery housing 20 . Alternatively, insulation may be realized by forming an insulating coating layer on a part of the terminal 50 . Alternatively, a method of structurally and firmly fixing the terminal 50 so that the contact between the terminal 50 and the battery housing 20 is impossible may be applied. Alternatively, a plurality of methods among the above-described methods may be applied together.
- the terminal 50 may include a body portion 50a inserted into the through hole; an outer flange portion (50b) extending along the outer surface from the periphery of one side of the body portion (50a) exposed through the outer surface of the upper end of the battery housing (20); an inner flange portion 50c extending toward the inner surface from the periphery of the other side of the body portion 50a exposed through the inner surface of the upper end of the battery housing 20; and a flat portion 50d provided inside the inner flange portion 50c.
- the outer flange portion 50b is exposed to the outside of the battery housing 20 .
- the outer flange portion 50b may be located approximately at the center of the upper surface of the battery housing 20 .
- the maximum width of the outer flange portion 50b may be greater than the maximum width of the hole formed in the battery housing 20 due to the penetration of the terminal 50 .
- the body portion 50a may be inserted into the battery housing 20 .
- the body portion 50a may pass through a substantially central portion of the upper surface of the battery housing 20 to be electrically connected to the first uncoated portion 11 . More specifically, the body portion 50a may pass through the battery housing 20 and the insulator 40 at the same time to be coupled to the first current collector 30 or the first uncoated portion 11 .
- the body portion 50a may be riveted to the inner surface of the battery housing 20 by an inner flange portion 50c. That is, an inner flange portion 50c having a shape bent toward the inner surface of the battery housing 20 by application of a caulking jig may be provided at the lower peripheral end of the body portion 50a.
- the maximum width of the body portion 50a may be formed to be larger than the maximum width of the hole of the battery housing 20 formed by the penetration of the body portion 50a.
- the body portion 50a may not have a curved shape toward the inner surface of the battery housing 20 . That is, the inner flange portion 50c may not be provided in the body portion 50a.
- the body portion 50a may have a substantially cylindrical shape passing through a hole located at a substantially central portion of the upper surface of the battery housing 20 .
- the body portion (50a) the planar shape may be a circular shape, but is not limited thereto.
- the body portion 50a may optionally have a polygonal shape, a star shape, or a shape having a leg extending from the center.
- the insulating gasket 60 is interposed between the battery housing 20 and the terminal 50 so that the battery housing 20 and the terminal 50 having opposite polarities are in contact with each other. to prevent That is, the insulating gasket 60 blocks the electrical connection between the battery housing 20 and the terminal 50 . Accordingly, the upper surface of the battery housing 20 having a substantially flat shape can function as the second electrode terminal of the battery 1 .
- the insulating gasket 60 includes a gasket exposed portion 61 and a gasket insertion portion 62 .
- the gasket exposed portion 61 is interposed between the outer flange portion 50b of the terminal 50 and the battery housing 20 .
- the gasket insertion part 62 is interposed between the body part 50a of the terminal 50 and the battery housing 20 .
- the gasket insertion part 62 is interposed between the inner flange part 50c and the battery housing 20 .
- the gasket insertion part 62 may be deformed together with the body part 50a during riveting of the body part 50a to be in close contact with the inner surface of the battery housing 20 .
- the thickness of the gasket exposed portion 61 and the gasket insertion portion 62 of the insulating gasket 60 may vary according to positions.
- the insulating gasket 60 may be made of, for example, a resin material having insulating properties.
- the insulating gasket 60 may be coupled to the battery housing 20 and the terminal 50 by thermal fusion. In this case, airtightness at the bonding interface between the insulating gasket 60 and the terminal 50 and at the bonding interface between the insulating gasket 60 and the battery housing 20 may be enhanced.
- the entire area of the upper surface of the battery housing 20 except for the area occupied by the terminal 50 and the insulating gasket 60 corresponds to the second electrode terminal having a polarity opposite to that of the terminal 50 .
- the terminal 50 having an insulating coating layer on the upper surface of the battery housing 20 is The entire region other than the occupied region may function as the second electrode terminal.
- the cylindrical sidewall of the battery housing 20 may be formed in one piece with the second electrode terminal so that there is no discontinuous portion therebetween.
- the connection from the sidewall of the battery housing 20 to the second electrode terminal may be a smooth curve.
- the present invention is not limited thereto, and the connecting portion may include at least one corner having a predetermined angle.
- the body portion 50a may have a substantially cylindrical shape penetrating a hole located at a substantially central portion of the upper surface of the battery housing 20 . Accordingly, the gasket insertion part 62 surrounding the body part 50a may be in close contact with the outer circumferential surface of the body part 50a. At the same time, the gasket insertion part 62 may also be in close contact with the first current collector 30 . According to such a structure, it may be easy to insert the terminal 50 into the hole of the battery housing 20 .
- the insulating gasket 60 and the insulator 40 may be made of the same material. Furthermore, the insulating gasket 60 may be integrally formed by being connected to the insulator 40 .
- the insulating gasket 60 may be made of, for example, a material having a restoring force. Therefore, when the insulating gasket 60 is inserted into the hole of the battery housing 20, its shape is deformed to a state that it is easy to fasten, and when the fastening is completed, it can return to the state shown in FIGS. 5C and 7 . .
- the battery according to an embodiment of the present invention may further include a side spacer 70 .
- the side spacers 70 may cover at least a portion of an outer peripheral surface of the electrode assembly 10 .
- the side spacer 70 may contact at least a portion of the battery housing 20 .
- the side spacer 70 may contact the inner circumferential surface of the battery housing 20 .
- the side spacer 70 may cover at least a portion of an outer circumferential surface of the electrode assembly 10 along an outer circumference of the electrode assembly 10 . That is, the side spacer 70 may be positioned between an outer circumferential surface of the electrode assembly 10 and an inner circumferential surface of the battery housing 20 .
- the side spacer 70 may have a thickness corresponding to the distance between the outer circumferential surface of the electrode assembly 10 and the inner circumferential surface of the battery housing 20 .
- a thickness of the side spacer 70 is approximately equal to a distance between an outer circumferential surface of the electrode assembly 10 and an inner circumferential surface of the battery housing 20 .
- the thickness of the side spacer 70 may be substantially the same as the thickness of the second cover part 42 of the insulator 40 .
- a space between the outer circumferential surface of the electrode assembly 10 and the inner circumferential surface of the battery housing 20 can be filled securely. Accordingly, even when vibration and external shock are applied to the battery 1 , the movement of the electrode assembly 10 within the battery housing 20 is minimized, thereby preventing damage to the electrical coupling portion.
- the end of the side spacer 70 may be formed to contact the second cover part 42 of the insulator 40 .
- the side spacers 70 may be integrally formed with the second cover part 42 . That is, the side spacers 70 may be integrally formed by being connected to the insulator 40 . According to this structure, the empty space between the outer circumferential surface of the electrode assembly 10 and the inner circumferential surface of the battery housing 20 is further reduced, so that vibration resistance can be further improved.
- the side spacers 70 may include an insulating polymer material.
- the second current collector 80 is coupled to a lower portion of the electrode assembly 10 .
- the second current collector 80 is made of a conductive metal material and is connected to the second uncoated region 12 .
- the second current collector 80 includes at least one tab coupling part 81 coupled to the second uncoated part 12 and a beading part 21 on the inner surface of the battery housing 20 .
- ) may include at least one housing coupling portion 82 electrically coupled to.
- the housing coupling part 82 may be press-fixed by the crimping part 22 .
- the housing coupling part 82 may be welded to the beading part 21 .
- the second current collector 80 is electrically connected to the battery housing 20 .
- the second current collector 80 is interposed between the inner surface (lower surface) of the beading part 21 of the battery housing 20 and the sealing gasket 100 as shown in FIGS. 4 and 8 to be fixed. can Alternatively, the second current collector 80 may be welded to the inner surface (lower surface) of the beading portion 21 .
- the second current collector 80 may have a leg structure in which the tab coupling part 81 and the housing coupling part 82 extend in a radial direction.
- the leg structure may be provided in plurality.
- the tab coupling part 81 is disposed below the electrode assembly 10 and may be located above the beading part 21 .
- the second current collector 80 has a circular current collector hole formed at a position corresponding to the winding center hole formed in the center of the electrode assembly 10 .
- the winding center hole and the current collector hole communicating with each other may function as a passage for insertion of a welding rod for welding between the terminal 50 and the first current collector 30 or irradiation of a laser welding beam.
- the second current collector 80 may include a plurality of irregularities radially formed on one surface thereof. When the unevenness is formed, the unevenness may be press-fitted into the second uncoated region 12 by pressing the second current collector 80 .
- the second current collector 80 is coupled to an end of the second uncoated region 12 .
- the coupling between the second uncoated region 12 and the second current collector 80 may be performed, for example, by laser welding.
- the laser welding may be performed by partially melting the base material of the second current collector 80 , and selectively interposing solder for welding between the second current collector 80 and the second uncoated region 12 . It can be done in the state.
- the solder preferably has a lower melting point than that of the second current collector 80 and the second uncoated region 12 .
- resistance welding, ultrasonic welding, etc. are possible, but the welding method is not limited thereto.
- the second current collector 80 may be coupled to a coupling surface formed by bending an end of the second uncoated region 12 in a direction parallel to the second current collector 80 .
- the bending direction of the second uncoated region 12 may be, for example, a direction toward the winding center C of the electrode assembly 10 .
- the second uncoated region 12 may include a plurality of segments, like the first uncoated region 11 , to form a bent structure. When the second uncoated area 12 has such a bent shape, the space occupied by the second uncoated area 12 may be reduced, thereby improving energy density.
- due to an increase in the bonding area between the second uncoated region 12 and the second current collector 80 it is possible to bring about an effect of improving the bonding force at the bonding surface and reducing the resistance.
- the cap 90 may be made of, for example, a metal material to ensure rigidity.
- the cap 90 covers an opening (or an open end) formed at the lower end of the battery housing 20 . That is, the cap 90 forms the lower surface of the battery 1 .
- the cap 90 does not have a polarity even if it is made of a conductive metal material. Having no polarity may mean that the cap 90 is electrically insulated from the battery housing 20 and the terminal 50 . Accordingly, the cap 90 does not function as a positive terminal or a negative terminal. Accordingly, the cap 90 does not need to be electrically connected to the electrode assembly 10 and the battery housing 20 , and the material does not necessarily have to be a conductive metal.
- the cap 90 When the battery housing 20 of the present invention includes the beading portion 21 , the cap 90 may be seated on the beading portion 21 formed in the battery housing 20 . In addition, when the battery housing 20 of the present invention includes the crimping portion 22 , the cap 90 may be fixed by the crimping portion 22 . An airtight gasket 100 may be interposed between the cap 90 and the crimping portion 22 of the battery housing 20 to secure airtightness of the battery housing 20 . On the other hand, as described above, the battery housing 20 of the present invention may not include the beading part 21 and/or the crimping part 22 , and in this case, the airtight gasket 100 is the battery housing 20 . In order to secure the airtightness of the battery housing 20 , it may be interposed between the fixing structure provided on the opening side of the battery housing 20 and the cap 90 .
- the cap 90 further includes a venting part 91 formed to prevent the internal pressure due to the gas generated inside the battery housing 20 from increasing beyond a preset value.
- the venting part 91 corresponds to a region of the cap 90 having a thinner thickness than that of the peripheral region.
- the venting part 91 is structurally weak compared to the surrounding area. Therefore, when an abnormality occurs in the battery 1 and the internal pressure of the battery housing 20 increases to a certain level or more, the venting part 91 is broken and the gas generated inside the battery housing 20 is discharged.
- the venting portion 91 may be formed, for example, by partially reducing the thickness of the battery housing 20 by notching on any upper and/or lower surface of the cap 90 .
- the sealing gasket 100 may have a substantially ring shape surrounding the cap 90 .
- the sealing gasket 100 may simultaneously cover a lower surface, an upper surface, and a side surface of the cap 90 .
- the radial length of a portion of the sealing gasket 100 that covers the upper surface of the cap 90 is smaller than the radial length of a portion of the sealing gasket 100 that covers the lower surface of the cap 90 , or can be the same If the radial length of the portion covering the upper surface of the cap 90 among the portions of the sealing gasket 100 is excessively long, in the sizing process of compressing the battery housing 20 up and down, the sealing gasket 100 becomes the second current collector ( 80 , there is a possibility that the second current collector 80 may be damaged or the battery housing 20 may be damaged. Therefore, it is necessary to keep the radial length of the portion covering the upper surface of the cap 90 among the portions of the sealing gasket 100 to be small at a certain level.
- the battery 1 may further include a lower spacer 110 .
- the lower spacer 110 may be interposed between the cap 90 and the second current collector 80 .
- the lower spacer 110 may be configured to prevent movement of the electrode assembly 10 .
- the lower spacer may have a height corresponding to the distance between the second current collector 80 and the cap 90 . Accordingly, the lower spacer 110 may surely fill the space between the cap 90 and the second current collector 80 . Accordingly, even when vibration and external shock are applied to the battery 1 , the movement of the electrode assembly 10 within the battery housing 20 is minimized, thereby preventing damage to the electrical coupling portion.
- the lower spacer 110 may include an insulating polymer material.
- the insulator 40 , the insulating gasket 60 , the side spacer 70 , and the lower spacer 110 of the present invention may include, for example, a material having elasticity. Therefore, when vibration and external shock are applied to the battery 1, the insulator 40, the insulating gasket 60, the side spacer 70, and the lower spacer 110 are compressed by elasticity and then return to their original state. It can absorb shock in the process. Accordingly, even when vibration and external shock are applied to the battery 1 , damage to internal components of the battery 1 can be minimized.
- a battery according to the present invention may have, for example, a form factor ratio (defined as the diameter of the battery divided by the height, i.e., the ratio of the height H to the diameter ⁇ ) greater than about 0.4.
- the form factor means a value indicating the diameter and height of the battery.
- the diameter of the cylindrical battery may be 40mm to 50mm, and the height may be 60mm to 130mm.
- the battery according to an embodiment of the present invention may be, for example, 46110 cells, 4875 cells, 48110 cells, 4880 cells, or 4680 cells.
- the first two numbers represent the diameter of the cell, and the remaining numbers represent the height of the cell.
- the form factor of the battery is increasing compared to the conventional 1865, 2170, and the like.
- An increase in the form factor leads to an increase in energy density, increased safety against thermal runaway, and improved cooling efficiency.
- the energy density of a battery can be further increased when the unnecessary space inside the battery housing is minimized with an increase in the form factor.
- the battery according to the present invention has an optimal structure capable of increasing the capacity of the battery while ensuring electrical insulation between the electrode assembly and the battery housing.
- the battery according to an embodiment of the present invention may be a battery having a substantially cylindrical shape, having a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of about 0.418.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of about 0.640.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, having a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of about 0.436.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, having a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of about 0.600.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, having a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of about 0.575.
- batteries having a form factor ratio of about 0.4 or less have been used. That is, conventionally, for example, an 1865 battery, a 2170 battery, or the like has been used. For an 1865 battery, its diameter is approximately 18 mm, its height is approximately 65 mm, and the form factor ratio is approximately 0.277. For a 2170 battery, its diameter is approximately 21 mm, its height is approximately 70 mm, and the form factor ratio is approximately 0.300.
- the battery according to the above-described embodiment may be used to manufacture a battery pack.
- FIG. 10 is a diagram schematically showing the configuration of a battery pack according to an embodiment of the present invention.
- the battery pack 3 includes an assembly to which the battery 1 is electrically connected and a pack housing 2 accommodating the assembly.
- the battery 1 is a battery according to the above-described embodiment.
- parts such as a bus bar, a cooling unit, and an external terminal for electrical connection of the batteries 1 are omitted for convenience of illustration.
- the battery pack 3 may be mounted on a vehicle.
- the vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle.
- the automobile includes a four-wheeled vehicle or a two-wheeled vehicle.
- FIG. 11 is a view for explaining a vehicle including the battery pack 3 of FIG. 10 .
- 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.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Aviation & Aerospace Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Passenger Equipment (AREA)
- Primary Cells (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Cell Separators (AREA)
Abstract
Description
Claims (71)
- 제1 전극 및 제2 전극과 이들 사이에 개재된 분리막이 권취 축을 중심으로 권취됨으로써 코어와 외주면을 정의한 전극 조립체로서, 상기 제1 전극은 권취 방향을 따라 활물질층이 코팅되어 있는 제1 활물질부와, 활물질층이 코팅되지 않은 제1 무지부를 포함하고, 상기 제1 무지부의 적어도 일부는 그 자체로서 전극 탭으로서 사용되는 전극 조립체;상기 전극 조립체의 상부에서 상기 제1 무지부의 적어도 일부에 결합되는 제1 집전체;상기 전극 조립체 및 상기 제1 집전체를 수용하는 배터리 하우징; 및상기 제1 무지부와 상기 배터리 하우징 사이의 전기적 연결을 차단하도록, 상기 제1 무지부 또는 상기 제1 집전체가 대향하는 상기 배터리 하우징의 내부 면과 상기 제1 무지부 또는 상기 제1 집전체 사이에 개재된 인슐레이터;를 포함하는 배터리.
- 제 1 항에 있어서,상기 인슐레이터는,상기 배터리 하우징의 내측 면과 대향하는 제1 무지부의 단부 또는 상기 제1 집전체의 표면을 커버하는 제1 커버부; 및상기 전극 조립체의 외주면의 상단을 커버하는 제2 커버부;를 포함하는 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제2 커버부는,상기 제1 커버부의 외주변부로부터 수직으로 하방 연장된 형태를 갖는 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제1 집전체는,상기 전극 조립체의 상부에서 상기 제1 무지부에 결합되어, 상기 제1 무지부와 상기 인슐레이터 사이에 개재되는 것을 특징으로 하는 배터리.
- 제 4 항에 있어서,상기 제1 커버부는,상기 배터리 하우징의 상단부의 내측 면과 대향하는 상기 제1 집전체의 표면을 커버하는 것을 특징으로 하는 배터리.
- 제 4 항에 있어서,상기 제1 커버부는,상기 제1 집전체와 상기 배터리 하우징의 상단부의 내측 면 사이의 거리와 대응되는 두께를 갖는 것을 특징으로 하는 배터리.
- 제 1 항에 있어서,상기 제1 무지부의 적어도 일부 구간은,상기 전극 조립체의 권취 방향을 따라 복수의 분절편으로 분할되어 있는 것을 특징으로 하는 배터리.
- 제 7 항에 있어서,상기 복수의 분절편은,상기 전극 조립체의 반경 방향을 따라 절곡되는 것을 특징으로 하는 배터리.
- 제 7 항에 있어서,상기 복수의 분절편은,상기 전극 조립체의 반경 방향을 따라 여러 겹으로 중첩되는 것을 특징으로 하는 배터리.
- 제 8 항에 있어서,상기 인슐레이터는,상기 배터리 하우징의 내측 면과 대향하는 상기 제1 무지부의 복수의 분절편이 절곡되어 형성된 절곡 면 또는 제1 집전체와 상기 배터리 하우징의 내측 면 사이에 개재된 제1 커버부; 및상기 전극 조립체의 외주면의 상단을 커버하는 제2 커버부;를 포함하는 것을 특징으로 하는 배터리.
- 제 10 항에 있어서,상기 제1 집전체는,상기 전극 조립체의 상부에서, 상기 절곡 면 상에 결합되어, 상기 절곡 면과 상기 인슐레이터 사이에 개재되는 것을 특징으로 하는 배터리.
- 제 11 항에 있어서,상기 제1 커버부는,상기 배터리 하우징의 상단부의 내측 면과 대향하는 상기 제1 집전체의 표면을 커버하는 것을 특징으로 하는 배터리.
- 제 12 항에 있어서,상기 제1 커버부는,상기 제1 집전체와 상기 배터리 하우징의 상단부의 내측 면 사이의 거리와 대응되는 두께를 갖는 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제2 커버부는,상기 제1 무지부가 상기 배터리 하우징의 내주면을 향해 노출되지 않도록 상기 제1 무지부의 최외곽의 노출된 측면부 전체를 커버하는 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제2 커버부의 연장 길이는,상기 제1 무지부의 연장 길이보다 크거나 같은 것을 특징으로 하는 배터리.
- 제 10 항에 있어서,상기 제2 커버부의 연장 길이는,상기 복수의 분절편 사이의 절단 라인 하단 지점으로부터, 상기 복수의 분절편의 절곡 지점까지의 길이보다, 크거나 같은 것을 특징으로 하는 배터리.
- 제 3 항에 있어서,상기 제2 커버부의 하단부는,상기 제1 무지부의 하단부보다 더 하부에 위치하는 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 인슐레이터는,절연 폴리머 재질을 포함하는 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 인슐레이터는,탄성을 갖는 재질로 구성된 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 인슐레이터는,상기 제1 커버부의 중심에 소정 직경을 갖는 중심 홀을 구비하는 것을 특징으로 하는 배터리.
- 제 20 항에 있어서,상기 제1 집전체의 중심은,상기 전극 조립체의 권취 중심과 동일 선 상에 위치하는 것을 특징으로 하는 배터리.
- 제 21 항에 있어서,상기 제1 집전체의 직경은,상기 인슐레이터의 상기 중심 홀의 직경보다 작거나 같은 것을 특징으로 하는 배터리.
- 제 21 항에 있어서,상기 제1 집전체의 직경은,상기 전극 조립체의 권취 중심 홀의 직경보다 큰 것을 특징으로 하는 배터리.
- 제 22 항에 있어서,상기 제1 커버부는,상기 제1 무지부의 단부와 상기 배터리 하우징의 상단부의 내측 면 사이의 거리와 대응되는 두께를 갖는 것을 특징으로 하는 배터리.
- 제 22 항에 있어서,상기 제1 무지부의 적어도 일부 구간은,상기 전극 조립체의 권취 방향을 따라 복수의 분절편으로 분할되어 있는 것을 특징으로 하는 배터리.
- 제 25 항에 있어서,상기 복수의 분절편은,상기 전극 조립체의 반경 방향을 따라 절곡되는 것을 특징으로 하는 배터리.
- 제 25 항에 있어서,상기 복수의 분절편은,상기 전극 조립체의 반경 방향을 따라 여러 겹으로 중첩되는 것을 특징으로 하는 배터리.
- 제 26 항에 있어서,상기 제1 커버부는,상기 배터리 하우징의 상단부의 내측 면과 대향하는 상기 제1 무지부의 복수의 분절편이 절곡되어 형성된 절곡 면과, 상기 배터리 하우징의 상단부의 내측 면 사이에 개재되는 것을 특징으로 하는 배터리.
- 제 28 항에 있어서,상기 제1 커버부는,상기 절곡 면과 상기 배터리 하우징의 상단부의 내측 면 사이의 거리와 대응되는 두께를 갖는 것을 특징으로 하는 배터리.
- 제 20 항에 있어서,상기 제1 무지부와 전기적으로 연결되고 적어도 일부가 상기 배터리 하우징의 상단부에 형성된 관통 홀을 통해 외부로 노출되는 단자;를 더 포함하는 것을 특징으로 하는 배터리.
- 제 30 항에 있어서,상기 단자는,상기 관통 홀에 삽입된 몸체부;상기 배터리 하우징의 상단부의 외측 면을 통해 노출된 상기 몸체부의 일측 둘레로부터 상기 외측 면을 따라 연장된 외부 플랜지부;상기 배터리 하우징의 상단부의 내측 면을 통해 노출된 상기 몸체부의 타측 둘레로부터 상기 내측 면을 향해 연장된 내부 플랜지부; 및상기 내부 플랜지부의 내측에 구비된 평탄부;를 포함하는 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 평탄부와 상기 배터리 하우징의 상단부의 내측 면은 서로 평행한 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 평탄부와 상기 제1 집전체는 서로 평행한 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 단자의 몸체부, 내부 플랜지부 및 평탄부는,상기 관통 홀을 통해 상기 배터리 하우징 내로 삽입되는 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 내부 플랜지부는,상기 배터리 하우징의 상단부의 내측 면을 향해 리벳팅되어 고정되는 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 인슐레이터의 상기 중심 홀의 직경은,상기 몸체부의 직경보다 크거나 같은 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 인슐레이터의 상기 중심 홀의 직경은,상기 내부 플랜지부의 직경보다 크거나 같은 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 단자의 몸체부는,상기 인슐레이터의 상기 중심 홀을 관통하는 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 단자의 평탄부는,상기 인슐레이터의 상기 중심 홀을 관통하여, 상기 제1 집전체와 전기적으로 결합되는 것을 특징으로 하는 배터리.
- 제 39 항에 있어서,상기 단자의 평탄부는,상기 제1 집전체와 용접 결합되는 것을 특징으로 하는 배터리.
- 제 31 항에 있어서,상기 배터리는,상기 배터리 하우징과 상기 단자 사이에 개재되어 상기 배터리 하우징과 상기 단자의 전기적 연결을 차단하는 절연 가스켓;을 더 포함하는 것을 특징으로 하는 배터리.
- 제 41 항에 있어서,상기 절연 가스켓은,상기 인슐레이터와 연결되어 일체로 형성된 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 전극 조립체의 외주면의 적어도 일부를 커버하며, 상기 배터리 하우징의 내주면과 접촉하는 사이드 스페이서;를 더 포함하는 것을 특징으로 하는 배터리.
- 제 43 항에 있어서,상기 사이드 스페이서는,상기 전극 조립체의 외주 둘레를 따라, 상기 전극 조립체의 외주면의 적어도 일부를 커버하는 것을 특징으로 하는 배터리.
- 제 43 항에 있어서,상기 사이드 스페이서는,상기 전극 조립체의 외주면과 상기 배터리 하우징의 내주면 사이의 거리와 대응되는 두께를 갖는 것을 특징으로 하는 배터리.
- 제 43 항에 있어서,상기 사이드 스페이서는,상기 인슐레이터와 연결되어 일체로 형성된 것을 특징으로 하는 배터리.
- 제 43 항에 있어서,상기 사이드 스페이서는,절연 폴리머 재질을 포함하는 것을 특징으로 하는 배터리.
- 제 43 항에 있어서,상기 사이드 스페이서는,탄성을 갖는 재질로 구성된 것을 특징으로 하는 배터리.
- 제 1 항에 있어서,상기 제2 전극은,권취 방향을 따라 활물질층이 코팅되어 있는 제2 활물질부와, 활물질층이 코팅되지 않은 제2 무지부를 포함하고, 상기 제2 무지부의 적어도 일부는 그 자체로서 전극 탭으로서 사용되는 것을 특징으로 하는 배터리.
- 제 49 항에 있어서,상기 전극 조립체의 하부에서 상기 제2 무지부와 결합하는 제2 집전체;를 더 포함하는 것을 특징으로 하는 배터리.
- 제 50 항에 있어서,상기 배터리 하우징은,하단에 형성된 개방부에 인접한 단부에 형성되며 내측을 향해 압입된 비딩부; 및상기 비딩부보다 상기 개방부를 향하는 측에 형성되며 상기 개방부를 향해 연장 및 절곡된 크림핑부;를 포함하는 것을 특징으로 하는 배터리.
- 제 51 항에 있어서,상기 제2 집전체는,상기 제2 무지부와 결합되는 적어도 하나의 탭 결합부; 및상기 배터리 하우징의 내측 면의 상기 비딩부에 전기적으로 결합되는 적어도 하나의 하우징 결합부;를 포함하는 것을 특징으로 하는 배터리.
- 제 52 항에 있어서,상기 하우징 결합부는,상기 크림핑부에 의해 압착 고정되는 것을 특징으로 하는 배터리.
- 제 52 항에 있어서,상기 하우징 결합부는,상기 비딩부에 용접 결합되는 것을 특징으로 하는 배터리.
- 제 50 항에 있어서,상기 배터리 하우징의 개방부를 커버하는 캡;을 더 포함하는 것을 특징으로 하는 배터리.
- 제 55 항에 있어서,상기 캡과 상기 제2 집전체 사이에 개재되며, 상기 전극 조립체의 유동을 방지하도록 구성된 하부 스페이서;를 더 포함하는 것을 특징으로 하는 배터리.
- 제 56 항에 있어서,상기 하부 스페이서는,상기 제2 집전체와 상기 캡 사이의 거리와 대응되는 높이를 갖는 것을 특징으로 하는 배터리.
- 제 56 항에 있어서,상기 하부 스페이서는,절연 폴리머 재질을 포함하는 것을 특징으로 하는 배터리.
- 제 56 항에 있어서,상기 하부 스페이서는,탄성을 갖는 재질로 구성된 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제1 커버부의 두께는,상기 제2 커버부의 두께와 상이한 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제2 커버부의 두께는,상기 제1 커버부의 두께보다 작은 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제1 커버부는,상기 제1 커버부의 외주변부에서 소정의 곡률 반경을 갖는 라운드부;를 구비하는 것을 특징으로 하는 배터리.
- 제 62 항에 있어서,상기 라운드부는,상기 제1 커버부의 상면과 상기 제2 커버부의 측면의 교차 지점에 형성되는 것을 특징으로 하는 배터리.
- 제 62 항에 있어서,상기 라운드부의 곡률 반경은,상기 배터리 하우징의 상단부의 내측 면과 상기 배터리 하우징의 측면의 교차 지점에 형성된 곡률 반경보다 작거나 같은 것을 특징으로 하는 배터리.
- 제 64 항에 있어서,상기 라운드부는,상기 배터리 하우징의 내측 면과 빈틈 없이 밀착되는 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제1 커버부 및 상기 제2 커버부는 일체로 형성된 것을 특징으로 하는 배터리.
- 제 2 항에 있어서,상기 제1 커버부 및 상기 제2 커버부는 별도로 형성되어 결합된 구조인 것을 특징으로 하는 배터리.
- 제 41 항에 있어서,상기 절연 가스켓은,상기 외부 플랜지부와 상기 배터리 하우징 사이에 개재된 가스켓 노출부; 및상기 내부 플랜지부와 상기 배터리 하우징 사이에 개재된 가스켓 삽입부;을 포함하고,상기 가스켓 노출부와 상기 가스켓 삽입부는, 위치에 따라 두께가 다른 것을 특징으로 하는 배터리.
- 제 20 항에 있어서,상기 제1 커버부의 상기 중심 홀의 주위에는, 상기 중심 홀보다 작은 직경을 갖는 복수의 홀이 더 형성되어 있는 것을 특징으로 하는 배터리.
- 제1항 내지 제69항 중 어느 한 항에 따른 복수의 배터리; 및복수의 상기 배터리를 수용하는 팩 하우징;을 포함하는 배터리 팩.
- 제70항에 따른 배터리 팩을 포함하는 자동차.
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PCT/KR2022/001008 WO2022158860A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리 및 이에 적용되는 집전체, 그리고 이러한 배터리를 포함하는 배터리 팩 및 자동차 |
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PCT/KR2022/001005 WO2022158857A2 (ko) | 2021-01-19 | 2022-01-19 | 전극 조립체, 배터리 및 이를 포함하는 배터리 팩 및 자동차 |
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