WO2022158861A2 - 전지 및 이에 적용되는 집전체, 그리고 이러한 전지를 포함하는 배터리 팩 및 자동차 - Google Patents
전지 및 이에 적용되는 집전체, 그리고 이러한 전지를 포함하는 배터리 팩 및 자동차 Download PDFInfo
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- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
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- 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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- 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, a current collector applied thereto, and a battery pack and a vehicle including the battery. More specifically, the present invention relates to a current collector having a structure capable of preventing damage to a welding portion with an electrode assembly even when an external impact is applied, a battery including the same, and a battery pack including the battery and automobiles.
- 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.
- Conventional cylindrical batteries generally have a structure in which a tab connecting a jelly-roll and an external terminal is welded to the foil of the jelly-roll.
- the path of current was limited and the self-resistance of the jelly-roll had to be very high.
- the jelly-roll in order to reduce the self-resistance of the jelly-roll, it is necessary to develop a new jelly-roll structure and a current collector structure suitable for the structure of the jelly-roll.
- the application of the jelly-roll and the current collector of this novel structure is more necessary for devices requiring a battery pack having high output/high capacity, such as, for example, an electric vehicle.
- the form factor of the cylindrical battery is increasing. That is, the diameter and height of the cylindrical battery are increasing compared to the conventional cylindrical 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 the cylindrical battery can be further increased when the unnecessary space inside the battery housing is minimized with an increase in the form factor. Therefore, it is necessary to design the entire structure of the battery as a low-resistance structure so that the current collector can minimize the amount of heat generated during rapid charging while increasing the capacity of the battery.
- the present invention was devised in consideration of the above problems, and an object of the present invention is to provide a current collector having a structure suitable for an electrode assembly having a low resistance structure, and a battery including the same.
- an object of the present invention is to provide a current collector having a structure capable of improving the bonding strength of a bonding site between the current collector and the battery housing, and a battery including the same.
- an object of the present invention is to provide a current collector having a structure capable of improving the energy density of the battery and a battery including the same.
- the present invention provides a current collector having a structure capable of increasing the convenience of a welding process for electrical connection between a battery housing and a current collector in manufacturing a battery, thereby improving productivity, and a battery including the same intended to provide
- the present invention provides a current collector having a structure that can greatly reduce the possibility of damage to a welding portion with an electrode assembly and/or a welding portion with a battery housing even when vibration and shock are applied, and a current collector including the same It aims to provide a battery.
- the present invention provides a current collector having a structure capable of increasing the convenience of a welding process for electrical connection between a battery housing and a current collector in manufacturing a battery, thereby improving productivity, and a battery including the same intended to provide
- a battery according to an embodiment of the present invention for solving the above problems is an electrode assembly in which a first electrode and a 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 may include an electrode assembly including a first uncoated region on which an active material layer is not coated along a winding direction; a battery housing having an opening on one side and accommodating the electrode assembly through the opening; A support portion disposed on an upper portion of the electrode assembly, a first tab coupling portion extending from the support portion to be coupled to the first uncoated portion, and a first housing coupling portion extending from the support portion and electrically coupled to an inner surface of the battery housing a first current collector comprising; and a housing cover sealing the opening.
- the first tab coupling part and the first housing coupling part may not be directly connected, but may be indirectly connected through the support part.
- the battery housing may include a beading portion formed at an end adjacent to the opening portion and press-fitted toward the inside.
- the first tab coupling part may include at least one injection hole.
- the first housing coupling portion may include: a first contact portion coupled to the beading portion of the battery housing; and a first connection part connecting the support part and the first contact part. may include.
- At least a portion of the first connection part may be disposed to contact the first uncoated part.
- the first tab coupling part, the first connection part, and the first contact part may have substantially the same width in an extension direction.
- the first tab coupling portion may have a greater width than the first connection portion.
- the first connection part may have a structure convex upward based on an imaginary straight line connecting both ends of the first connection part in the longitudinal direction.
- the first connection part may have a structure raised upward than the beading part.
- the beading unit may include an upper beading unit located above the innermost point that is press-fitted; and a lower beading unit located below the innermost point by being press-fitted; may include.
- the upper beading part and the lower beading part may be asymmetrical with respect to a virtual reference plane passing an innermost point of the beading part in parallel with the bottom surface of the battery housing.
- At least one first tab coupling part of the first current collector may be located further below the lower beading part.
- At least one of the upper beading part and the lower beading part may be inclined at a predetermined angle with the lower surface of the battery housing.
- the first contact part may be seated on an inclined upper surface of the beading part.
- At least one of the upper beading part and the lower beading part may be parallel to a lower surface of the battery housing in at least some regions.
- the first contact part may be seated on a flat upper surface of the beading part.
- the first contact portion may be welded to an upper surface of the beading portion.
- the first contact portion may be welded in a flat region formed on the upper beading portion.
- the first contact portion may have an arc shape, at least a portion of which extends in a circumferential direction along the beading portion of the battery housing. It may have an arc shape extending in opposite directions along the circumferential direction on the part.
- the press-fitting depth of the beading portion is PD
- the minimum value of the radius of curvature of the beading portion is R1, min
- the minimum value of the weld bead width is W bead,min
- the beading portion and the inside of the battery housing When the minimum value of the radius of curvature in the boundary region between the side surfaces is R2, min , PD ⁇ R1, min +R2, min +W bead,min may be satisfied.
- the press-fitting depth of the beading part may be 0.2 to 10 mm.
- the indentation depth of the beading part is PD
- the maximum value of the indentation depth is PDmax
- the overlap length is the shortest distance from the end of the first contact part to the vertical line passing the innermost point of the beading part.
- the minimum value of the radius of curvature of the beading part is R1, min
- the minimum value of the weld bead width is W bead,min
- a welding area between the first contact part and the beading part may be narrower than a flat upper surface of the beading part.
- the indentation depth of the beading part is PD, and the maximum value of the indentation depth is PDmax , from the innermost point of the beading part to the center point of the weld bead located at the outermost radial direction.
- the distance be W, the overlap length that is the shortest distance from the end of the first contact part to the vertical line passing the innermost point of the beading part is OV, the minimum value of OV is OV min and the maximum value of OV is OV max
- the minimum value of the weld bead width is W bead,min , (OV min -0.5*W bead,min )/PD max ⁇ W/PD ⁇ (OV max -0.5*W bead,min )/PD max
- the minimum value of the distance from the innermost point of the beading part to the center point of the weld bead positioned at the outermost radial direction is W1
- the radius from the innermost point of the beading part when the overlap length is OV.
- the beading portion has a flat section parallel to the lower surface of the battery housing in at least a partial region, and the length of the flat section of the beading section in contact with the first current collector has an overlap length of OV, and the radius of curvature of the beading section is When R1, it may be OV - R1.
- a radial width length of the welding pattern formed between the beading part and the first contact part may be W bead,min or more and OV ⁇ R1 or less.
- the ratio of the length of the radial width of the welding pattern to the length of the flat section may satisfy a range of 10 to 40%.
- the first connection part may include at least one first bending part whose extension direction is switched at least once.
- the first bending part passes through the center of an imaginary straight line connecting one end of the first contact part and one end of the first tab coupling part and may be located above an imaginary plane parallel to the bottom surface of the battery housing.
- the at least one first bending part may be bent at an obtuse angle so as not to overlap each other when viewed along the longitudinal axis of the battery housing.
- a boundary point of the first contact portion and the first connection portion may be bent at an obtuse angle.
- the first connection part may have a shape in which the inclination thereof is gradually or gradually decreased toward the beading part.
- An angle between the first tab coupling part and the first connection part may be 0 to 90 degrees.
- the first connection part may support the housing cover.
- the first tab coupling portion and the first contact portion may be positioned at substantially the same height.
- the first contact portion may have a flat surface coupled to an upper surface of the beading portion facing the opening portion.
- the first current collector may include a current collector hole formed in the center thereof.
- the current collector hole may be provided at a position corresponding to the winding hole formed in the center of the electrode assembly.
- a diameter of the current collector hole may be greater than or equal to a diameter of a winding hole provided in the core of the electrode assembly.
- the first current collector may include a second housing coupling part extending from an end of the first tab coupling part and coupled to the inner surface of the battery housing; may further include.
- the second housing coupling portion may include a second contact portion coupled to an inner surface of the battery housing; and a second connection part connecting an end of the first tab coupling part and the second contact part; may include.
- At least a portion of the second contact portion may have a shape extending along an inner circumferential surface of the battery housing.
- the second connection part may include at least one second bending part whose extension direction is switched at least once.
- the distance from the center of the first current collector to the end of the first tab coupling part may be substantially the same as or shorter than the distance from the center of the winding hole of the electrode assembly to the innermost part of the beading part.
- a flat part may be provided on the upper surface of the beading part.
- At least one welding bead formed between the beading part and the first contact part, and the at least one welding bead may form a linear welding pattern extending in a circumferential direction.
- At least one welding bead formed between the beading part and the first contact part, and the at least one welding bead may form an arc-shaped welding pattern extending in a circumferential direction.
- a welding bead formed between the beading part and the first contact part may form a welding pattern, and the welding pattern may have a line shape in which point welding is connected.
- a plurality of welding beads formed between the beading part and the first contacting part may be formed in the same first contacting part.
- the second electrode may further include a second uncoated region on which an active material layer is not coated along a winding direction, and in this case, the battery passes through the battery housing from the opposite side of the open portion to form the second uncoated region and the second uncoated region.
- terminals electrically connected; may further include.
- the battery may further include a second current collector positioned between the electrode assembly and the terminal, wherein the second current collector includes: a second tab coupling part coupled to the second uncoated part; and a terminal coupling unit coupled to the terminal; may include.
- the terminal coupling part may cover a winding hole of the electrode assembly.
- An outer diameter of the second current collector may be larger than an outer diameter of the first current collector.
- the second tab coupling part may be coupled to a coupling surface formed by bending of the second uncoated part.
- the battery housing may include a crimping part that is formed on the beading part and extends and bends to surround the edge of the housing cover.
- the first housing coupling part may be press-fixed by the crimping part.
- the battery may further include a sealing gasket disposed in the crimping part and interposed between the battery housing and the housing cover.
- the first contact part may be interposed between the beading part and the sealing gasket.
- the first contact part may be fixed by bending the crimping part.
- the sealing gasket may have a greater thickness in a region not in contact with the first contact portion than in a region in contact with the first contact portion.
- a compression ratio in a region in contact with the first contact portion may be greater than a compression ratio in a region not in contact with the first contact portion.
- the sealing gasket may have substantially the same compressibility in a region in contact with the first contact portion and a compressibility in a region not in contact with the first contact portion.
- the thickness of the sealing gasket may vary for each area along the circumferential direction on the beading part.
- the sealing gasket may alternately increase and decrease in thickness along the circumferential direction on the beading portion.
- the compression ratio of the sealing gasket may be changed for each area along the circumferential direction on the beading part.
- the first housing coupling part may be elastically biased on the beading part.
- a connection portion of the first contact portion and the first connection portion may be mated with an inner surface of the beading portion.
- At least a portion of the first uncoated region may include a plurality of segment segments divided along a winding direction of the electrode assembly, and the plurality of segment segments are bent along a radial direction of the electrode assembly to form a curved surface.
- the plurality of bent fragments may form a curved surface while being overlapped in multiple layers, and the number of overlapping layers of the fragments sequentially increases to a maximum value as the curved surface goes from the outer periphery side of the electrode assembly to the core side. It may include an increasing section and a section where the number of layers is uniform from a radius point at which the number of overlapping layers becomes the maximum to a radius point at which the innermost segment exists.
- the first tab coupling part may be coupled to the bent surface so as to overlap the uniform number of stacking sections.
- the number of overlapping layers in the uniform number of stacking sections may be 10 or more.
- the first tab coupling part may be welded to the curved surface, and a welding area of the tab coupling part may overlap the uniform number of stacking sections by at least 50% or more in a radial direction of the electrode assembly.
- the first uncoated portion and the first tab coupling portion may be coupled to each other by welding along a radial direction of the electrode assembly.
- the first tab coupling part may be welded to the first uncoated part in a state parallel to a lower surface of the battery housing.
- a welding bead formed between the first uncoated portion and the first tab coupling portion may form a linear welding pattern extending in a radial direction of the electrode assembly.
- a welding bead formed between the first uncoated portion and the first tab coupling portion may form a welding pattern, and the welding pattern may have a line shape in which point welding is connected.
- a width of the weld bead formed between the first uncoated portion and the first tab coupling portion may be 0.1 mm or more.
- Each of the first tab coupling part and the first housing coupling part may be provided in plurality, and the plurality of first tab coupling parts and the first housing coupling part may be radially, cross-shaped, or cross-shaped with respect to the center of the first current collector. These may be arranged in a combined form.
- the plurality of first housing coupling parts may be disposed between first tab coupling parts adjacent to each other, respectively.
- a plurality of the first housing coupling parts may be provided, and the first contact parts of each of the plurality of first housing coupling parts may be interconnected and integrally formed.
- the outermost point of the first connection part may be spaced apart from the innermost point of the beading part by a predetermined distance.
- An angle between the first contact part and the first connection part may be an acute angle by the first bending part.
- a plurality of injection holes may be provided.
- the plurality of injection holes may be arranged to be symmetrical left and right with respect to the width direction center of the first tab coupling part.
- a welding bead for coupling the first tab coupling part and the first uncoated part may be formed between the injection holes arranged to be symmetrical left and right.
- the first tab coupling portion may have a greater width at a position spaced apart from the connection portion toward the longitudinal end of the first tab coupling portion by a predetermined distance than a width at the connection portion between the first tab coupling portion and the support portion.
- the injection hole may be formed at a position spaced apart from the connection portion by a predetermined distance toward the longitudinal end of the first tab coupling portion.
- At least a portion of the region in which the injection hole is formed has a width at a position spaced a predetermined distance from the connection portion toward the end of the first tab coupling portion compared to a width at the connection portion of the first tab coupling portion and the support portion. By increasing this, it can be included in the increased area.
- a longitudinal end of the first tab coupling portion may have an arc shape corresponding to an inner circumferential surface of the battery housing.
- An extension direction of a welding pattern formed between the first uncoated portion and the first tab coupling portion and an extension direction of a welding pattern formed between the beading portion and the first contact portion may be perpendicular to each other.
- the innermost point of the beading part may be located further inward in the radial direction than the distal point of the crimping part.
- the sealing gasket surrounds the housing cover, and a radial length of a portion of the sealing gasket that covers the lower surface of the housing cover is a radial length of a portion of the sealing gasket that covers the upper surface of the housing cover It can be formed smaller.
- a ratio of an area in which the first current collector does not contact the upper surface of the electrode assembly to an area of a circle having an outer diameter of the electrode assembly as a diameter may be 30% or more and less than 100%.
- a ratio of an area in which the first current collector does not contact the electrode assembly to an area of a circle having an outer diameter of the electrode assembly as a diameter may be 60% or more and less than 100%.
- a diameter of the current collector hole may be smaller than a diameter of a winding hole provided in the core of the electrode assembly.
- the diameter of the current collector hole may be 0.5*R3 or more and less than R3.
- the diameter of the current collector hole may be 0.7*R3 or more and less than R3.
- a ratio of the form factor obtained by dividing the diameter of the battery by the height may be greater than 0.4.
- the resistance measured between the positive electrode and the negative electrode may be 4 milliohms or less.
- a first electrode and a second electrode and a separator interposed therebetween are wound around a winding axis to define a core and an outer circumferential surface, wherein the first electrode is disposed in a winding direction.
- an electrode assembly including a first uncoated region along which the active material layer is not coated; a battery housing having an opening on one side and accommodating the electrode assembly through the opening; and a current collector electrically coupled to the first uncoated portion and an inner surface of the battery housing, wherein the current collector includes a first portion in contact with the inner surface of the battery housing and a first uncoated portion coupled to the first uncoated portion It may include two parts, and when the central region of the first part is projected onto a plane in which the second part is present, the central region of the first part and the second part are spaced apart from each other in a circumferential direction of the electrode assembly.
- the battery may further include a sealing gasket interposed between the opening of the battery housing and the current collector.
- the first part may be interposed between the inner surface of the battery housing and the sealing gasket, and the first part and the second part may be positioned on different planes in a direction of a winding axis of the electrode assembly.
- the current collector for solving the above-described problems, as a current collector for electrically connecting between an electrode assembly applied to a battery and a battery housing, a support portion disposed on the upper portion of the electrode assembly; a plurality of tab coupling parts extending from the support part and coupled to the first uncoated part of the electrode assembly; and a first housing coupling part extending from the support part, positioned between the tab coupling parts adjacent to each other, and electrically coupled to the beading part of the battery housing; includes
- the tab coupling part and the housing coupling part may not be directly connected, but may be indirectly connected through the support part.
- the tab coupling part may include at least one injection hole.
- the first housing coupling portion may include: a first contact portion coupled to an inner surface of the battery housing; and a first connection part connecting the support part and the contact part; may include
- the first connection part may include at least one first bending part whose extension direction is switched at least once.
- the current collector may include a current collector hole formed in the center thereof.
- the current collector may include a second housing coupling part extending from one end of the plurality of tab coupling parts and coupled to the inner surface of the battery housing; may further include.
- the second housing coupling portion may include a second contact portion coupled to an inner surface of the battery housing; and a second connection part connecting one end of the plurality of tab coupling parts and the contact part; may include
- At least a portion of the second connection part may be disposed to contact the first uncoated part 11 .
- the first tab coupling part, the second connection part, and the second contact part may have substantially the same width in an extension direction.
- the first tab coupling portion may have a greater width than the second connection portion.
- the second contact portion may have a greater width than the second connection portion.
- a plurality of the first housing coupling parts may be provided, and the first contact part of each of the plurality of first housing coupling parts may be interconnected and integrally formed.
- an angle between the contact part and the connection part may be an acute angle.
- a plurality of injection holes may be provided.
- the plurality of injection holes may be arranged to be left and right symmetrical with respect to the width direction center of the tab coupling part.
- the tab coupling portion may be formed to have a greater width at a position spaced apart from the connection portion toward the longitudinal end of the tab coupling portion by a predetermined distance than a width at the connection portion of the tab coupling portion and the support portion.
- the injection hole may be formed at a position spaced apart from the connection portion by a predetermined distance toward the longitudinal end of the tab coupling portion.
- At least a portion of the region in which the injection hole is formed is increased by increasing a width at a position spaced a predetermined distance from the connection portion toward the end of the tab coupling portion compared to a width at the connection portion of the tab coupling portion and the support portion. can be included in the area.
- the longitudinal end of the tab coupling part may have an arc shape corresponding to the inner circumferential surface of the battery housing.
- a battery pack according to an embodiment of the present invention includes a plurality of batteries according to an embodiment of the present invention as described above.
- a plurality of the batteries may be arranged in a predetermined number of rows, and the terminals of each battery and the outer surface of the bottom of the battery housing may be arranged to face upward.
- the battery pack of the present invention may include a plurality of bus bars for connecting a plurality of cells in series and in parallel, and each bus bar may be disposed on top of adjacent cells, and each bus bar is disposed between adjacent terminals.
- a body portion extending from; a plurality of first bus bar terminals extending to one side of the body portion and electrically coupled to the electrode terminals of the battery located at the one side; and a plurality of second bus bar terminals extending to the other side of the body part and electrically coupled to the outer surface of the bottom of the battery housing of the battery located on the other side.
- 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.
- resistance can be greatly reduced in electrically connecting the electrode assembly and the battery housing.
- the present invention in manufacturing a battery, the convenience of a welding process for electrical connection between the battery housing and the current collector is improved, thereby improving productivity.
- FIG. 1 is a cross-sectional view showing the internal structure of a cylindrical battery according to an embodiment of the present invention.
- FIG. 2 is a view showing a current collector (a first current collector) according to an embodiment of the present invention.
- FIG. 3 to 5 are views illustrating various exemplary forms of a first connection part of a current collector (a first current collector) according to an embodiment of the present invention.
- 6 and 7 are views illustrating the shape of the first connection part according to the height of the electrode assembly, respectively.
- FIG. 8 is a view showing a current collector (a first current collector) according to another embodiment of the present invention.
- FIG. 9 is a view showing a current collector (a first current collector) according to another embodiment of the present invention.
- FIG. 10 is a view showing an exemplary form of a second connection part of the current collector (first current collector) shown in FIG. 9 .
- FIG. 11 and 12 are views illustrating a current collector (a first current collector) of the present invention having a shape different from that described and illustrated in the previous embodiments.
- FIG. 13 is a view showing the internal structure of a cylindrical battery to which the current collector (first current collector) shown in FIG. 12 is applied.
- FIG. 14 is a plan view illustrating a combination of a current collector (a first current collector) and a battery housing according to the present invention.
- FIG. 16 is an enlarged view of an upper portion of the uncoated region of FIG. 15 .
- 17 is a view for explaining a welding process of the current collector (the first current collector).
- 18 is a view for explaining a beading process of the battery housing.
- 19 is a view for explaining a crimping process of the battery housing.
- 20 is a view for explaining a sizing process of the battery housing.
- 21 is a view for explaining a change in the shape of the current collector (first current collector) after the sizing process according to the shape of the current collector before the sizing process.
- 22 and 23 are views for explaining the shape of a current collector (first current collector) configured to maintain a welded area even after a sizing process.
- 24 is a view for explaining the position, length, width, etc. of the weld bead formed in the welding area between the contact part and the beading part of the current collector (first current collector) of the present invention.
- FIG. 25 is a diagram showing an embodiment of a current collector (second current collector) applied to the present invention.
- FIG. 26 is a diagram showing a current collector (second current collector) according to an embodiment different from the current collector (second current collector) shown in FIG. 25 .
- FIG. 27 is a plan view illustrating an electrode structure according to a preferred embodiment of the present invention.
- FIG. 28 is a cross-sectional view taken along the longitudinal direction (Z) of the electrode assembly in which the uncoated segmental structure of the first electrode is also applied to the second electrode according to the embodiment of the present invention.
- 29 is a cross-sectional view taken along the longitudinal direction (Z) of the electrode assembly in which the uncoated region is bent according to an embodiment of the present invention.
- FIG. 30 is a perspective view of an electrode assembly in which an uncoated region is bent according to an embodiment of the present invention.
- FIG. 31 is a top plan view showing a state in which a plurality of cylindrical batteries according to an embodiment of the present invention are connected in series and in parallel using a bus bar.
- FIG. 32 is a view showing a schematic configuration of a battery pack including cylindrical cells according to an embodiment of the present invention.
- FIG 33 is a view showing a schematic configuration of a vehicle including a battery pack according to an embodiment of the present invention.
- substantially identical may include deviations considered low in the art, for example, deviations within 5%.
- 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 jelly roll 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.
- a cylindrical battery 1 includes an electrode assembly 10 , a battery housing 20 , a current collector (a first current collector) 30 , and a housing cover 40 . ) and a terminal 50 .
- the cylindrical battery 1 may further include a sealing gasket G1 and/or an insulating gasket G2 and/or a current collector (second current collector) 60 and/or an insulator 70 .
- the present invention is not limited by the shape of the battery, and is applicable to batteries of other shapes, such as prismatic batteries.
- the electrode assembly 10 includes a first uncoated area 11 and a second uncoated area 12 . More specifically, the electrode assembly 10 has a structure in which the first electrode and the second electrode and the separator interposed therebetween are wound around a winding axis with a separator interposed therebetween to define a core and an outer circumferential surface.
- the electrode assembly 10 applied to the present invention may be a jelly-roll type electrode assembly. In this case, an additional separator may be provided on the outer peripheral surface of the electrode assembly 10 to insulate it from the battery housing 20 .
- the electrode assembly 10 may have, without limitation, a winding structure well known in the art.
- the first electrode includes a first electrode current collector and a first electrode active material coated on one or both surfaces of the first electrode current collector.
- An uncoated region to which the first electrode active material is not applied is present at one end of the first electrode in the width direction (in a direction parallel to the height direction of the cylindrical battery 1 shown in FIG. 1 ). That is, the first electrode includes an uncoated region that is not coated with an active material on the long side end along the winding direction and is exposed to the outside of the separator.
- the uncoated region serving as the first electrode tab will be referred to as a first uncoated region 11 hereinafter.
- the first uncoated region 11 is provided above the electrode assembly 10 accommodated in the battery housing 20 in a height direction (in a direction parallel to the height direction of the cylindrical battery 1 shown in FIG. 1 ). That is, the first electrode includes a first uncoated region that is not coated with an active material layer on a long side end and is exposed to the outside of the separator, and at least a portion of the first uncoated region is used as an electrode tab by itself.
- the first uncoated region 11 may be, for example, a negative electrode tab.
- the first uncoated region 11 may include a plurality of segments divided along the winding direction of the electrode assembly 10 .
- the plurality of segment pieces (reference numeral 11a in FIG. 30 ) may be bent along the radial direction of the electrode assembly 10 .
- a plurality of segments of the bent first uncoated region 11 may be overlapped in multiple layers to form a curved surface (coupling surface) 102 .
- the tab coupling part (first tab coupling part) 32 of the current collector (first current collector) 30 to be described later may be coupled to the bent surface 102 .
- the tab coupling part 32 may be coupled to a region in which a plurality of fragments overlap in multiple layers.
- the curved surface 102 has a section for increasing the number of overlapping layers in which the number of overlapping layers of the fragments sequentially increases from the outer peripheral side to the core side of the electrode assembly 10 to the maximum value, and the innermost fragment from the radius point where the number of overlapping layers becomes the maximum. It may include a uniform section in the number of layers up to the radius point.
- the tab coupling part 32 may be coupled to a region in which a plurality of segments of the first uncoated part 11 overlap in multiple layers.
- the tab coupling part 32 may be coupled to the curved surface 102 so as to overlap the uniform number of stacked sections.
- the number of overlapping layers of the first uncoated area 11 on the curved surface 102 of the first uncoated area 11 is It can be made in the area of about 10 or more sheets.
- the radial ratio of the section in which the number of overlapping layers is 10 or more may be designed to be about 25% or more based on the radius of the electrode assembly 10 excluding the core by adjusting the length of the first uncoated region 11 .
- the tab coupling part (first tab coupling part) 32 of the current collector (first current collector) 30 may be coupled to the bent surface 102 so as to overlap the uniform number of stacking sections.
- the tab coupling part 32 is welded to the bent surface 102 , and the welding area of the tab coupling part 32 is at least 50% or more with a uniform number of stacks along the radial direction of the electrode assembly 10 . can be nested.
- the number of overlapping layers in the uniform number of stacking sections may be about 10 or more.
- the current collector 30 When the current collector 30 is welded to the bent surface 102 of the first uncoated region 11 , it is preferable to increase the laser output in order to sufficiently secure welding strength.
- the laser penetrates through the area where the first uncoated region 11 overlaps and penetrates to the inside of the electrode assembly 10 to damage the separator, the active material layer, and the like. Therefore, in order to prevent laser penetration, it is preferable to increase the number of overlapping layers of the first uncoated area 11 to a certain level or more.
- the height of the fragment In order to increase the number of overlapping layers of the first uncoated region 11 , the height of the fragment must be increased. However, when the height of the fragment is increased, a swell may occur in the first uncoated region 11 during the manufacturing process of the first electrode current collector. Therefore, it is preferable to adjust the height of the fragment to an appropriate level.
- the radial length ratio of the number of overlapping layers of the fragments of the uncoated region is 25% or more based on the radius of the electrode assembly, and the current collector 30 and the region where the fragments of the uncoated region overlap 10 or more.
- the overlapping portion of the uncoated region sufficiently masks the laser to prevent damage to the separator, the active material layer, and the like by the laser.
- the output of the laser may be appropriately adjusted in the range of about 250W to 320W or in the range of about 40% to 90% of the maximum laser power specification, but the present invention is not limited thereto.
- the welding strength can be sufficiently increased.
- the weld strength may be increased to 2 kgf/cm 2 or more, more preferably 4 kgf/cm 2 or more.
- the welding strength may be preferably set to 8 kgf/cm 2 or less, more preferably 6 kgf/cm 2 or less.
- Weld strength is defined as the tensile force per unit area of the current collector 30 (kgf/cm 2 ) when the current collector plate begins to separate from the bent surface area.
- a tensile force is applied to the current collecting plate, but the size thereof is gradually increased.
- the tensile force increases, the uncoated area begins to separate from the weld interface.
- a value obtained by dividing the tensile force applied to the current collector by the area of the current collecting plate is the weld strength.
- FIG. 16 shows the first uncoated portion 11 of the first electrode current collector divided into a plurality of segments in an electrode assembly having a radius of 22 mm and a core radius of 4 mm included in a cylindrical battery having a form factor of 4680. It is a partial cross-sectional view showing a state in which the bent surface area overlapped by 10 sheets or more appears while being bent from the outer periphery side to the core side.
- the electrode assembly region without the segment and the core region are not separately illustrated.
- the height of the fragments starts from 3 mm and increases by 1 mm for every 1 mm increase in the radius of the electrode assembly. And, after reaching the length of 6mm, 7mm, or 8mm as shown in the drawing, the height of the fragment is maintained substantially the same.
- the number of overlapping layers of the first uncoated area 11 gradually increases from the outer periphery to the core, and the maximum value of the number of overlapping layers increases as the length of the first uncoated area 11 increases.
- the number of overlapping layers of the first uncoated region 11 divided into a plurality of segmented segments increases to 18 from the outer peripheral surface of the electrode assembly to a 7 mm section, and , in the 8 mm section toward the core, the number of overlapping layers of the first uncoated region 11 is maintained at the maximum level of 18, and then decreases by 1-2 in the radial section adjacent to the core.
- the height of the fragment increases stepwise from 3 mm to 8 mm in the radius of 7 mm to 12 mm.
- the section of uniform number of layers is defined as a section of radius from the point where the number of overlapping layers reaches the maximum value to the point at which the innermost segment is located, as shown in FIG. 16 . Accordingly, the ratio of the uniform number of stacked sections in which 10 or more segments of the first uncoated region 11 are overlapped is 44.4% (8/18) of the radius of the electrode assembly excluding the core (4 mm).
- the number of overlapping layers of the first uncoated region 11 divided into a plurality of segments increases to 15 from the outer peripheral surface of the electrode assembly to a section 6 mm, and , in the 9 mm section toward the core, the number of overlapping layers of the first uncoated region 11 is kept constant at the maximum level of 15, and then decreases by 1-2 in the radial section adjacent to the core.
- the height of the fragment increases stepwise from 3 mm to 7 mm in the radius of 7 mm to 11 mm. Therefore, the ratio of the uniform number of stacked sections in which 10 or more fragments of the first uncoated region 11 overlapped the electrode assembly excluding the core (4 mm). 50% of the radius (9/18).
- the number of overlapping layers of the first uncoated area 11 divided into a plurality of segments increases to 12 from the outer peripheral surface of the electrode assembly to a section 5 mm.
- the number of overlapping layers of the first uncoated region 11 is kept constant at the maximum level of 12, and then decreases by 1-2 in the radial section adjacent to the core.
- the height of the fragment increases from 3 mm to 6 mm in a radius of 7 mm to 10 mm. Accordingly, the ratio of the uniform number of stacked sections in which 10 or more segments of the first uncoated region 11 are overlapped is 55.6% (10/18) of the radius of the electrode assembly excluding the core (4 mm).
- the length of the section in which the number of overlapping layers is sequentially increased increases from 5 mm to 7 mm as the length of the first uncoated region 11 is longer, and in particular, the ratio of the section with the number of stacked layers equal to or greater than 10 is the core. It can be seen that the condition of 25% or more is satisfied based on the radius of the electrode assembly except for the electrode assembly.
- the uniform number of layers may be increased or decreased by the radius of the core, the minimum and maximum values of the fragment height in the segment height variable interval, and the increase width of the fragment height in the radial direction of the electrode assembly. Therefore, it is very obvious to those skilled in the art to design the ratio to be 25% or more by adjusting factors affecting the ratio of the uniform number of layers. In one example, if the minimum and maximum values of the fragment height are increased together in the section height variable section, the number of stacked layers increases while the ratio of the section with the number of stacked sections uniform can be reduced to a level of 25%.
- the section where the number of stacks is uniform is an area in which the current collector can be welded. Therefore, if the ratio of the uniform number of laminated sections is adjusted to 25% or more, the welding strength of the current collector can be secured in a desirable range, and it is advantageous in terms of resistance of the welding interface.
- the second electrode includes a second electrode current collector and a second electrode active material coated on one or both surfaces of the second electrode current collector.
- An uncoated region to which the second electrode active material is not applied is present at the other end of the second electrode in the width direction (in a direction parallel to the height direction of the cylindrical battery 1 shown in FIG. 1 ). That is, the second electrode includes an uncoated region that is not coated with an active material on the long side end along the winding direction and is exposed to the outside of the separator.
- the uncoated region functioning as the second electrode tab will be referred to as a second uncoated region 12 hereinafter.
- the second uncoated region 12 is provided under the height direction of the electrode assembly 10 accommodated in the battery housing 20 .
- the second electrode includes a second uncoated region exposed to the outside of the separator without the active material layer being coated on the long side end, and at least a portion of the second uncoated region is used as an electrode tab by itself.
- the second uncoated region 12 may be, for example, a positive electrode tab.
- the second uncoated region 12 may include a plurality of segments divided along the winding direction of the electrode assembly 10 .
- the plurality of segments may be bent along a radial direction of the electrode assembly 10 .
- the plurality of segments of the second uncoated region 12 that are bent may be overlapped in multiple layers to form a curved surface (coupling surface) 102 .
- the tab coupling portion (second tab coupling portion) 62 of the current collector (second current collector) 60 to be described later may be coupled to the bent surface 102 .
- the tab coupling part 62 may be coupled to a region in which a plurality of fragments overlap in multiple layers.
- the curved surface 102 has a section for increasing the number of overlapping layers in which the number of overlapping layers of the fragments sequentially increases from the outer peripheral side to the core side of the electrode assembly 10 to the maximum value, and the innermost fragment from the radius point where the number of overlapping layers becomes the maximum. It may include a uniform section in the number of layers up to the radius point.
- the tab coupling part (second tab coupling part 62) of the current collector (second current collector) 60 may be coupled to a curved surface to overlap the uniform number of stacking sections.
- the tab coupling part 62 is welded on the curved surface 102, and the welding area of the tab coupling portion 62 may overlap the uniform number of stacked sections along the radial direction of the electrode assembly 10 by at least 50% or more.
- the number of overlapping layers in the uniform number of stacking sections may be about 10 or more.
- the first current collector 30 and/or the second current collector 60 is formed on the substantially flat bonding surface 102 formed by bending the first uncoated area 11 and/or the second uncoated area 12 .
- the laser penetrates through the area where the first uncoated area 11 and/or the second uncoated area 12 overlap and penetrates to the inside of the electrode assembly 10 to form a separator, an active material layer, and the like. may damage it. Therefore, in order to prevent laser penetration, it is preferable to increase the number of overlapping layers of the first uncoated area 11 and/or the second uncoated area 12 to a certain level or more.
- the height of the fragment In order to increase the number of overlapping layers of the first uncoated area 11 and/or the second uncoated area 12 , the height of the fragment must be increased. However, when the height of the segment is increased, swell may occur in the first uncoated area 11 and/or the second uncoated area 12 during the manufacturing process of the electrode plate. Therefore, the height of the fragment is preferably adjusted to an appropriate level.
- the radial length of the section in which the number of overlapping layers of the fragments of the first uncoated region 11 and/or the second uncoated region 12 is 10 or more is approximately 25% or more compared to the radius of the electrode assembly 10 . design, and when welding is performed within the welding target area, the overlapping portions of the first uncoated area 11 and/or the second uncoated area 12 sufficiently mask the laser to protect the laser even if the output of the laser is increased. It is possible to prevent damage to the separator, the active material layer, and the like.
- 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 low crystalline carbon, high crystalline carbon, or 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
- 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 battery housing 20 is a substantially cylindrical container having an opening formed on one side thereof, and is made of a metal material having conductivity.
- a side surface of the battery housing 20 and a lower surface (a lower surface with reference to FIG. 1 ) positioned on the opposite side of the opening are generally formed integrally. That is, the battery housing 20 generally has an open upper end in the height direction and a closed lower end thereof.
- a lower surface of the battery housing 20 may have an approximately flat shape.
- the battery housing 20 accommodates the electrode assembly 10 through an opening formed on one side in the height direction (parallel to the Z-axis).
- the battery housing 20 may also accommodate the electrolyte through the opening.
- the battery housing 20 may include a beading portion 21 formed at an end adjacent to an opening provided at the upper end of the battery housing 20 .
- the battery housing 20 may further include a crimping part 22 formed on the beading part 21 .
- the beading part 21 has a shape in which the outer peripheral surface of the battery housing 20 is press-fitted to a predetermined depth. More specifically, the beading part 21 may have a shape press-fitted toward the inside in a region between the opening formed on one side of the battery housing 20 and the receiving part accommodating the electrode assembly 10 .
- the press-fitting depth of the beading part 21 may be, for example, about 0.2 to 10 mm.
- the minimum value of the indentation depth PD of the beading part 21 is the radius of curvature R1 of the beading part 21 , the width W bead of the weld bead, and the inner surface of the beading part 21 and the battery housing 20 .
- the radius of curvature R2 in the boundary region between them must all be considered.
- the radius of curvature R1 of the beading portion 21 and the radius of curvature in the boundary region between the beading portion 21 and the inner surface of the battery housing 20 In addition to R2), additional space is required.
- the indentation depth PD is R1 + R2
- an additionally required space must be greater than or equal to the minimum width W bead,min of the weld bead BD. Therefore, the minimum value of the indentation depth PD satisfies the following relational expression.
- the minimum values of R1, min and R2, min may each be approximately 0.05 mm, and W bead,min may be approximately 0.1 mm.
- the minimum value of the indentation depth PD may be about 0.2 mm or more.
- the maximum value of the press-in depth PD of the beading part 21 may vary depending on the material and thickness of the battery housing 20 .
- the maximum value of the indentation depth PD of the beading portion 21 may be approximately 10 mm. have.
- the press-fitting depth PD of the beading portion 21 may have a value of approximately 0.2 to 10 mm.
- the beading part 21 is formed on the electrode assembly 10 .
- the inner diameter of the battery housing 20 in the region where the beading portion 21 is formed is smaller than the diameter of the electrode assembly 10 .
- the beading part 21 includes an upper beading part positioned above the innermost point into which the battery housing 20 is press-fitted and a lower beading part positioned below the press-fitted innermost point centering on the innermost point. can do.
- At least one tab coupling part 32 of the current collector 30, which will be described later, may be located further below the lower beading part.
- At least one of the upper beading part and the lower beading part may have an inclined shape while forming a predetermined angle with the lower surface of the battery housing 20 .
- the first contact portion 33a of the current collector (first current collector) 30 to be described later may be seated on the inclined upper surface of the upper beading portion of the beading portion 21 .
- At least one of the upper beading part and the lower beading part may have a shape substantially parallel to the lower surface of the battery housing 20 in at least some regions.
- the first contact portion 33a of the current collector 30 to be described later may be seated on a substantially flat upper surface of the upper bead portion.
- the first contact portion 33a may have a flat surface coupled to an upper surface of the beading portion 21 facing the open portion of the battery housing 20 .
- the upper surface of the beading portion 21 means a surface facing the open portion.
- the beading part 21 provides a support surface on which the housing cover 40 can be seated.
- the beading part 21 may provide a support surface on which at least a portion of the periphery of the current collector 30 to be described later can be seated and coupled. That is, at least a portion of the edge of the current collector 30 and/or the edge of the housing cover 40 may be seated on the upper surface of the upper beading part.
- the upper surface of the upper beading part is approximately parallel to the lower surface of the battery housing 20 .
- the beading portion 21 is omitted, and at least a portion of the periphery of the current collector 30 is directly attached to the flat sidewall of the battery housing 20 .
- the beading part 21 may include an upper beading part and a lower beading part located at the upper part and the lower part, respectively, based on the innermost part positioned in the innermost part along the press-in direction.
- the upper beading part and the lower beading part may have an asymmetrical shape to each other.
- the upper beading part and the lower beading part may have an asymmetrical shape based on a virtual reference plane passing the innermost point of the beading part in parallel with the bottom surface of the battery housing 20 .
- This asymmetric shape may be formed in the process of compressing the battery housing 20 along the height direction (parallel to the Z-axis) of the battery housing 20 through a sizing process.
- the sizing process is a process of adjusting the height of the cylindrical battery 1 to a design form factor by pressing the battery housing 20 along the winding axis direction of the electrode assembly 10 .
- the upper beading part may have a flat part substantially parallel to the closing part of the battery housing 20 .
- the lower bead portion may have a shape that is inclined at least partially downward along the direction toward the innermost portion. Accordingly, the lower beading portion may be fixed by pressing the upper portion of the electrode assembly 10 .
- the beading part 21 prevents the electrode assembly 10, which may have a size approximately corresponding to the inner diameter of the battery housing 20, from escaping through the opening formed at the top of the battery housing 20, and the housing cover ( 40) may function as a support to be seated.
- the upper beading part may function as a support part for fixing the housing cover 40 as well as the first contact part 33a of the current collector (first current collector) 30 , the sealing gasket G1 , and the like.
- the crimping part 22 is formed on the beading part 21 .
- the crimping part 22 has an extended and bent shape to surround the edge of the housing cover 40 disposed on the beading part 21 .
- the housing cover 40 is fixed on the beading part 21 .
- the crimping portion 22 is omitted and the housing cover 40 is fixed while covering the opening of the battery housing 20 through another fixing structure.
- the innermost point of the beading part 21 may be located more inward along the radial direction of the electrode assembly 10 than the distal point of the crimping part 22 . For example, referring to FIG.
- the distal point of the crimping part 22 may be located further outward in the radial direction. According to this structure, it is possible to maintain a relatively flat beading portion 21 even after the sizing process. If, for example, the innermost point of the beading part 21 is located more outward in the radial direction than the distal point of the crimping part 22, the radial length of the upper surface of the crimping part 22 is the beading part ( 21) becomes longer than the radial length. Then, the area of the upper surface of the crimping part 22, which is a portion subjected to pressure in the sizing process, is widened, and accordingly, the beading part 21 may not be flat after the sizing process.
- the current collector 30 according to an embodiment of the present invention is accommodated in the battery housing 20 , is electrically connected to the electrode assembly 10 , and is also the battery housing (20) is electrically connected. That is, the current collector 30 electrically connects the electrode assembly 10 and the battery housing 20 .
- the current collector 30 includes a support part 31 positioned on one surface of the electrode assembly 10 and a plurality of tab coupling parts (first tab coupling parts) 32 coupled to the first uncoated part 11 . and a plurality of first housing coupling parts 33 extending from the support part 31 and coupled to the inner surface of the battery housing 20 .
- the tab coupling part 32 and the first housing coupling part 33 are indirectly connected through the support part 31 and are not directly connected to each other. Accordingly, when an external impact is applied to the cylindrical battery 1 of the present invention, damage occurs in the coupling portion between the current collector 30 and the electrode assembly 10 and the coupling portion between the current collector 30 and the battery housing 20 . possibility can be minimized.
- At least one of the tab coupling part 32 and/or the first housing coupling part 33 may be provided.
- the at least one tab coupling part 32 and the at least one first housing coupling part 33 may be disposed in a substantially radial shape, a cross shape, or a combination thereof, for example, based on the central portion of the current collector 30 .
- each of the plurality of first housing coupling parts 33 may be disposed between the tab coupling parts 32 adjacent to each other.
- the support part 31 and the plurality of tab coupling parts 32 are disposed on the electrode assembly 10 .
- the tab coupling part 32 is coupled to the first uncoated part 11 of the electrode assembly 10 .
- the tab coupling part 32 may be coupled to the first uncoated part 11 by welding, for example, along a radial direction of the electrode assembly 10 .
- the tab coupling part 32 may be welded to the first uncoated part 11 in a state substantially parallel to the lower surface of the battery housing 20 , for example.
- the welding bead formed between the first uncoated region 11 and the tab coupling portion 32 may form, for example, a welding pattern having a substantially linear shape extending along the radial direction of the electrode assembly 10 .
- the welding pattern may have, for example, a line shape in which point welding is connected.
- the welding pattern may include one pattern or two or more patterns extending along the radial direction of the electrode assembly 10 .
- the support part 31 may also be coupled to the first uncoated part 11 .
- the tab coupling part 32 and the first uncoated part 11 may be coupled by welding.
- the support part 31 and the tab coupling part 32 are located below the beading part 21 when the beading part 21 is formed in the battery housing 20 .
- the support part 31 may include a current collector hole H2 formed at a position corresponding to the winding hole H1 formed in the substantially central portion of the electrode assembly 10 .
- the winding hole H1 and the current collector hole H2 that communicate with each other are welded between the terminal 50 and the current collector (second current collector) 60 to be described later or between the terminal 50 and the lead tab (not shown). It can function as a passage for insertion of an electrode for welding or irradiation of a laser beam.
- the current collector hole H2 may have substantially the same or larger diameter than the winding hole H1 of the electrode assembly 10 so as not to cover the winding hole H1 formed in the core of the electrode assembly 10. have.
- the hole formed in the winding hole H1 may be covered and the injection property may be reduced, and also the insertion or insertion of a welding device or It may be difficult to secure enough space for laser irradiation.
- the diameter of the current collector hole H2 may be smaller than that of the winding hole H1 .
- the diameter of the current collector hole H2 may be about 0.5*R3 or more and less than R3, and preferably about 0.7*R3 or more and less than R3.
- the separator or uncoated portion at the winding center side may come out from the upper surface of the electrode assembly 10 by strong pressure while gas is discharged from the winding center portion of the electrode assembly 10 .
- the diameter of the current collector hole H2 is preferably 0.5*R3 or more, and more preferably 0.7*R3 or more.
- the plurality of tab coupling parts 32 may have a shape extending from the support part 31 of the current collector 30 toward the sidewall of the battery housing 20 approximately radially. Each of the plurality of tab coupling parts 32 may be positioned to be spaced apart from each other along the circumference of the support part 31 .
- the first uncoated part 11 is the first uncoated part 11 .
- At least a portion of the first uncoated portion 11 may be formed in a bent shape so that an end thereof is substantially parallel to the tab coupling portion 32 .
- the bending may be made toward, for example, the winding center C of the electrode assembly 10 .
- the coupling area is increased to obtain an effect of improving coupling force and reducing electrical resistance.
- the bent end of the first uncoated region 11 may be overlapped in multiple layers. As such, when the plurality of layers of the first uncoated region 11 overlap, the tab coupling portion 32 of the current collector 30 has the coupling surface 102 formed by bending the first uncoated region 11 and overlapping the plurality of layers. ) (refer to FIGS. 15 and 16) may be coupled to the same as described above.
- the plurality of first housing coupling parts 33 may have a shape extending from the support part 31 of the current collector 30 approximately radially toward the sidewall of the battery housing 20 . Each of the plurality of first housing coupling parts 33 may be positioned to be spaced apart from each other along the circumference of the support part 31 . At least one first housing coupling part 33 may be positioned between the adjacent tab coupling parts 32 . The plurality of first housing coupling parts 33 may be coupled to, for example, the beading part 21 among the inner surfaces of the battery housing 20 . The first housing coupling parts 33 may be coupled to, in particular, the upper surface of the beading part 21 .
- the first housing coupling part through a process of accommodating the electrode assembly 10 in a state where the current collector 30 is coupled in the battery housing 20 . (33) can be naturally seated on the beading portion (21). Accordingly, the welding process of the battery housing 20 and the current collector 30 may be easily performed.
- Welding for bonding the battery housing 20 and the current collector 30 may be, for example, laser welding, ultrasonic welding, spot welding, or the like.
- the resistance level can be limited to about 4 milliohms or less suitable for rapid charging. have.
- the upper surface of the beading part 21 extends in a direction substantially parallel to the lower surface of the battery housing 20 , that is, in a direction substantially perpendicular to the sidewall of the battery housing 20 , and the first housing coupling part 33 ) also has a shape extending in the same direction, that is, in the radial and circumferential directions, so that the first housing coupling part 33 can be stably contacted on the beading part 21 .
- welding between the two parts may be smoothly performed, thereby improving the coupling force between the two parts and minimizing the increase in resistance at the coupling part. effect can be obtained.
- the first housing coupling part 33 includes a first contact part 33a coupled to the inner surface of the battery housing 20 and a support part 31 and a first contact part ( 33a) and a first connection part 33b for connecting them. At least a portion of the first connection part 33b may be disposed to contact the first uncoated part 11 .
- the first connection part 33b and the first contact part 33a may have substantially the same width along the extension direction.
- the first tab coupling portion 32 may have a greater width than the first connection portion 33b.
- the first contact portion 33a may have a greater width than the first connection portion.
- the first contact portion 33a is coupled to the inner surface of the battery housing 20 .
- the first contact part 33a may be coupled to the beading part 21 as described above.
- both the beading portion 21 and the first contacting portion 33a are approximately parallel to the lower surface of the battery housing 20 , that is, approximately on the sidewall of the battery housing 20 for stable contact and coupling. It may have a shape extending in a vertical direction.
- a connection portion between the first contact portion 33a and the first connection portion 33b may be combined with the inner surface of the beading portion 21 .
- the shape of the connecting portion of the first contact portion 33a and the first connecting portion 33b may be configured to match the shape of the beading portion 21 at a position corresponding thereto.
- the coupling force between the first housing coupling part 33 and the beading part 21 may be increased, and the contact area may be increased. Accordingly, the resistance reduction effect may be increased.
- the outermost point of the first connection part 33b may be spaced apart from the innermost point of the beading part 21 by a predetermined distance.
- the first connection part 33b may include at least one first bending part B1 whose extension direction is switched between the support part 31 and the first contact part 33a at least once.
- the first connection part 33b may have a structure that can be contracted and extended within a certain range, for example, a spring-like structure or a bellows-like structure.
- the structure of the first connection part 33b is a process of accommodating the electrode assembly 10 to which the current collector 30 is coupled in the battery housing 20 even if there is a height distribution of the electrode assembly 10 within a certain range. In the first contact portion (33a) to be in close contact on the beading portion (21).
- the vertical distance D between the first contact part 33a and the support part 31 in a state where there is no deformation because no external force is applied to the current collector 30 is, the current collector 30
- the distance in the vertical direction between the upper surface of the beading part 21 and the support part 31 is substantially the same as that of the first connection part 33b. It is preferable to be formed smaller within the stretchable range. That is, the first housing coupling part 33 may be elastically biased on the beading part 21 . More specifically, the first housing coupling part 33 stores elastic energy to cause deformation in a direction in which the linear distance from one end of the first connection part 33b in the longitudinal direction to the other end is reduced.
- the first connection part 33b is configured to satisfy such a condition
- the first contact part 33a is a beading part when the electrode assembly 10 to which the current collector 30 is coupled is seated in the battery housing 20 . (21) can be naturally adhered to the phase.
- the structure in which the first connection part 33b can be contracted and stretched is constant even when the electrode assembly 10 moves up and down due to vibration and/or impact occurring during the use of the cylindrical battery 1 (see FIG. 1 ). Within the range, the impact caused by the movement of the electrode assembly 10 is reduced. That is, in the structure in which the first connection part 33b can be contracted and stretched, a coupling part between the first contact part 33a and the battery housing 20 and a coupling part between the tab coupling part 32 and the first uncoated part 11 are formed. It can act as a buffer so that the shock is not transmitted (see FIGS. 1 to 5).
- the first contact portion 33a may be welded to the upper surface of the beading portion 21 (the upper surface of the upper beading portion). Furthermore, the first contact portion 33a may be welded to a flat area on the upper surface of the beading portion 21 . A welding area between the first contact part 33a and the beading part 21 may be formed to be narrower than a flat upper surface of the beading part 21 .
- the angle between the first contact part 33a and the first connection part 33b may be an acute angle due to the first bending part B1.
- the current collector 30 according to another embodiment of the present invention has a difference in the shape of the first contact portion 33a compared to the current collector 30 (the current collector described with reference to FIG. 2 ) described above. There is only, other than that, the structure of the current collector 30 described above may be applied substantially the same.
- the first contact portion 33a may have an arc shape extending in a circumferential direction along the bead portion 21 of the battery housing 20 . Accordingly, the circumferential extension length of the first contact portion 33a may be longer than the width of the first connection portion 33b.
- the current collector 30 includes the sum of the circumferential extension lengths of the first contact portions 33a of each of the plurality of first housing coupling portions 33 of the battery housing 20 . It may be configured to be substantially equal to or slightly shorter than the inner periphery.
- the first contact portion 33a may have an arc shape extending in opposite directions along the circumferential direction on the beading portion 21 from the intersection of the connecting portion 33b and the contact portion 33a.
- the current collector 30 according to another embodiment of the present invention is a second housing compared to the current collectors 30 (the current collector described with reference to FIGS. 2 and 8 by way of example) according to the previous embodiments. There is only a difference in that the coupling part 34 is further provided, and other than that, the structures of the current collectors 30 (see FIG. 9 ) described above may be applied substantially the same.
- the second housing coupling part 34 extends from an end of the tab coupling part 32 and is coupled to the inner surface of the battery housing 20 .
- the second housing coupling part 34 may be provided at an end of at least one of the plurality of tab coupling parts 32 .
- the second housing coupling part 34 is formed between the second contact part 34a coupled to the inner surface of the battery housing 20 and the end of the tab coupling part 32 of the support part 31 and the second contact part 34a. and a second connecting portion 34b for connecting them. At least a portion of the second connection part 34b may be disposed to contact the first uncoated part 11 .
- the first tab coupling portion 32 , the second connection portion 34b , and the second contact portion 34a may have substantially the same width along the extension direction.
- the first tab coupling portion 32 may have a greater width than the second connection portion 34b.
- the second contact portion 34a may have a greater width than the second connection portion 34b.
- the second contact portion 34a is coupled to the inner surface of the battery housing 20 .
- the second contact part 34a may be coupled to the beading part 21 like the above-described first contact part 33a .
- both the beading portion 21 and the second contacting portion 34a are substantially parallel to the lower surface of the battery housing 20 , that is, on the sidewall of the battery housing 20 . It may have a shape extending in an approximately vertical direction.
- the second contact portion 34a is also circumferentially along the beading portion 21 of the battery housing 20 . It may have an extended form. Accordingly, the circumferential extension length of the second contact portion 34a may be longer than the width of the second connection portion 34b. In this case, in order to maximize the contact area between the current collector 30 and the battery housing 20 , the current collector 30 has a circumferential direction of the first contact portions 33a of each of the plurality of first housing coupling portions 33 .
- the sum of the sum of the extension lengths and the sum of the circumferential extension lengths of the second contact portions 34a of each of the plurality of second housing coupling portions 34 is substantially equal to or slightly greater than the inner periphery of the battery housing 20 . It can be configured to be short.
- the second connecting portion 34b is a second bending portion B2 whose extension direction is switched between the tab coupling portion 32 and the second contact portion 34a at least once. ) may be provided with at least one. Due to the formation of the second bending part B2, the second connection part 34b has a structure that can be contracted and stretched, and thus has an advantage and a buffering effect in the assembly process of the cylindrical battery 1, as described above. same as bar
- the current collector (first current collector) 30 of the present invention may include at least one injection hole H3 .
- the injection hole H3 may be provided, for example, in the tab coupling part 32 .
- the injection hole H3 may be provided in at least one tab coupling part 32 .
- the injection hole H3 may be provided on one side or on both sides of the at least one welding bead W formed on the tab coupling part 32, for example.
- a battery assembly including an electrode assembly 10 and a current collector (first current collector) 30 is used.
- the electrolyte may be injected. In this case, injection performance may be improved due to the injection hole H3.
- a plurality of injection holes H3 may be provided.
- the plurality of injection holes H3 may be disposed to be substantially symmetrical left and right with respect to the width direction center of the tab coupling part 32 .
- a welding bead W for coupling the tab coupling part 32 and the first uncoated part 11 may be formed between the injection holes H3 arranged to be substantially symmetrical in this way.
- the tab coupling portion 32 has a greater width at a position spaced a predetermined distance from the connection portion toward the longitudinal end of the tab coupling portion than the width at the connection portion between the tab coupling portion 32 and the support portion 31 . can be formed large. At least a portion of the region in which the injection hole H3 is formed is predetermined toward the end of the tab coupling part 32 from the connection part compared to a width at the connection part of the tab coupling part 32 and the support part 31 . By increasing the width at the spaced-apart location, it can be included in the increased area.
- the longitudinal end of the tab coupling portion 32 may have a substantially arc shape to correspond to the inner peripheral surface of the battery housing 20 .
- the first connection part 33b of the first housing coupling part 33 of the present invention and/or the second connection part 34b of the second housing coupling part 34 are bent once. It may have a shape, and may have a shape bent in a direction different from that shown in FIGS. 3 and 10 . That is, the first bending part B1 formed on the first connection part 33b and/or the second bending part B2 formed on the second connection part 34b is the cylindrical battery 1 (see FIG. 1 ). It may have a shape protruding in a direction toward the center.
- the bending direction of the first connecting portion 33b and/or the second connecting portion 34b is determined by the bonding portion of the current collector (first current collector) 30 and the electrode assembly 10 and/or the bending direction of the second connecting portion 34b during the sizing process. Alternatively, this is to prevent damage to the coupling portion between the current collector (first current collector) 30 and the battery housing 20 .
- the sizing process is a compression process for reducing the height occupied by the beading portion 21 area of the battery housing 20 in order to reduce the total height of the cylindrical battery 1 in manufacturing the cylindrical battery 1 . .
- the current collector 30 is placed on the electrode assembly 10 accommodated in the battery housing 20 , the first uncoated region 11 protrudes upward of the electrode assembly 10 . and the current collector 30 are welded.
- the tab coupling portion of the current collector 30 is on the bent surface 102 (see FIG. 15 ) on which the plurality of segment pieces 11a (see FIG. 20 ) provided in the first uncoated region 11 are bent (see FIG. 15 ). (32) is welded.
- the current collector 30 may be pre-welded to the bent surface 102 before accommodating the electrode assembly 10 in the battery housing 20 .
- the beading knife may advance toward the inside of the battery housing 20 . Accordingly, a beading part 21 having a shape press-fitted toward the inside of the battery housing 20 is formed on the sidewall of the battery housing 20 , and the beading part 21 is a contact part 33a of the current collector 30 . ) is located below the Accordingly, the later contact portion 33a and the bead portion 21 are placed in a weldable position.
- the contact part 33a of the current collector 30 may be placed on the upper surface of the beading part 21 .
- the current collector 30 and the beading part 21 may be welded in a state in which the current collector 30 is placed on the upper surface of the beading part 21 .
- a housing cover 40 whose end is wrapped by a sealing gasket G1 may be placed on the upper surface of the contact portion 33a. Thereafter, the battery housing 20 is bent to surround the edge of the housing cover 40 to fix the housing cover 40 and the current collector 30 .
- the crimping part 22 is formed by bending the region positioned above the beading part 21 of the battery housing 20 , and the housing cover 40 and the house by the extension and bent shape of the crimping part 22 .
- the contact portion 33a of the whole 30 is fixed on the beading portion 21 .
- the housing coupling part 33 may be press-fixed by a crimping part 22 .
- the extension directions may be substantially perpendicular to each other.
- the extending direction of the welding pattern formed between the first uncoated portion 11 and the tab coupling portion 32 is the radial direction of the electrode assembly 10 , and the beading portion 21 and the first contacting portion 33a .
- the extending direction of the welding pattern formed therebetween may be the circumferential direction of the electrode assembly 10 (or the battery housing 20 ). In this case, the tangent line drawn at any point in the circumferential direction is perpendicular to the radial direction.
- the bonding strength between the current collector 30 and the electrode assembly 10 and the bonding strength between the current collector 30 and the battery housing 20 may increase. That is, according to this structure, even if vibration and/or impact is applied to the cylindrical battery 1 in any direction, the current collector 30 can maintain a rigidly fixed state with the electrode assembly 10 and the battery housing 20, respectively.
- the sizing process is a compression process for reducing the height occupied by the beading portion 21 of the battery housing 20 in order to reduce the total height in manufacturing the cylindrical battery.
- the sizing process since the battery housing 20 is compressed in a height direction (a direction parallel to the Z-axis), the beading portion 21 of the electrode assembly 10 is pressed and a portion thereof may be compressed.
- the current collector 30 since the battery housing 20 is compressed in the longitudinal direction (up and down direction), the current collector 30 may be bent under pressure in the vertical direction.
- the current collector 30 needs to have a structure capable of preventing damage to the welding portion between the tab coupling portion 32 and the first uncoated portion 11 even after the sizing process.
- connection part (first connection part) 33b has an upwardly convex shape, as shown in FIG. 20 , suppression of the phenomenon in which the tab coupling part 32 is lifted upward The effect can be maximized. That is, when the battery housing 20 of FIG. 19 is compressed in the vertical direction, upward stress is applied to the tab coupling portion 32 of the present invention as the connection portion 33b is bent. However, when the connecting portion 33b has a substantially upwardly convex shape like the current collector 30 of the present invention, the stress applied to the tab coupling portion 32 may be minimized. Accordingly, the tab coupling portion 32 is not bent upward, and a welding state of the welded portion with the first uncoated portion 11 may be maintained well.
- connection part 33b before the sizing process is between the connection point of the contact part 33a and the connection part 33b and the connection point of the connection part 33b and the tab coupling part 32. It may have a structure convex upward based on a virtual straight line connecting, that is, a virtual straight line connecting between both ends in the longitudinal direction of the connecting portion 33b.
- a virtual straight line connecting that is, a virtual straight line connecting between both ends in the longitudinal direction of the connecting portion 33b.
- at least one bending portion B1 forming an obtuse angle may be provided on the connection portion 33b.
- the bending part B1 may be located above an imaginary plane parallel to the bottom surface of the battery housing 20 while passing through the approximate center of an imaginary straight line connecting both ends of the connection part 33b.
- the length of the connecting portion 33b from the bending portion B1 to the tab coupling portion 32 is longer than the length of the connecting portion 33b from the bending portion B1 to the contact portion 33a.
- the contact part 33a goes down as shown in the arrow direction, and the connection part 33b protrudes upward as shown in the arrow direction (refer to the dotted line). More specifically, the connecting portion (33b) is raised upward than the beading portion (21). That is, the profile of the housing coupling part 33 changes before and after the sizing process as shown in FIGS. 22 and 23 .
- the degree to which the connection part 33b is raised may vary according to a change in the height of the battery housing 20 generated by the sizing process.
- the position of the bending part B1 may be raised up to the height level of the contact part 33a.
- connection portion 33b As a result of the upward elevation of the connection portion 33b as described above, most of the stress can be absorbed from the connection portion 33b , and thus the stress applied to the welding region between the tab coupling portion 32 and the first uncoated portion 11 . This is relatively small. Therefore, according to the present invention, the phenomenon in which the tab coupling part 32 is lifted upward does not occur.
- the length of the connection portion 33b from the bending portion B1 to the tab coupling portion 32 is greater than the length of the connection portion 33b from the bending portion B1 to the contact portion 33a. Since it is longer, insertion of the current collector 30 into the battery housing 20 is facilitated, and stress distribution can be made effectively.
- the shape deformation due to the elevation of the connecting portion 33b may be formed in an upwardly convex approximately curved shape as shown in FIG. 22 , and on the other hand, as shown in FIG. It may be formed in the form of a bent straight line.
- the area from the bending portion B1 to the contact portion 33a and the area from the bending portion B1 to the tab coupling portion 32 in the connecting portion 33b Each may have a straight shape.
- the present inventors have studied the structure of the current collector 30 according to the progress of the sizing process when the connection part 33b has an upwardly convex structure. It was confirmed that damage to the welding area between the tab coupling portion 32 and the first uncoated portion 11 was significantly reduced.
- Experimental Example 1 is an experimental example in which the connection part 33b before sizing is a linear shape
- Experimental Example 2 is an experimental example in which the connection part 33b before sizing is convex downward
- Experimental Example 3 is an experimental example in which the connection part 33b before sizing ( 33b) is an upwardly convex experimental example.
- the slope of the connection part 33b is not constant and the slope in the upper region based on a predetermined point (eg, the bending part B1) is in the lower region. It may be smaller than the slope.
- the predetermined point may be located above the middle point of the connection part 33b.
- the connecting portion 33b may have an upwardly convex shape based on an imaginary straight line connecting the tab coupling portion 32 and the contact portion 33a.
- the convex shape may be a shape in which a straight line and a straight line are connected, a curved shape, or a combination thereof. In an example, as shown in FIG. 22 or FIG.
- the connection part 33b may include at least one bending part B1 based on the predetermined point.
- the at least one bending part B1 may be bent at an obtuse angle so as not to overlap each other when viewed along the longitudinal axis of the battery housing 20 .
- a boundary point between the contact portion 33a and the connection portion 33b may be bent at an obtuse angle. Accordingly, the inclination of the connecting portion 33b may be gradually or gradually reduced as the connecting portion 33b moves toward the beading portion 21 .
- the angle ⁇ between the tab coupling part 32 and the connection part 33b may be, for example, 0 to 90 degrees.
- the tab coupling part 32 and the contact part 33a may be positioned at the same height.
- the angle ⁇ between the tab coupling part 32 and the connection part 33b is approximately 0 degrees.
- the contact portion 33a is positioned lower than the tab coupling portion 32 . In this case, the first uncoated portion 11 may be excessively pressed by the beading portion 21 and may be damaged.
- the angle ⁇ between the tab coupling portion 32 and the connection portion 33b is preferably 0 degrees or more.
- the angle ⁇ between the tab coupling portion 32 and the connection portion 33b may increase to approximately 90 degrees depending on a shape in which the length, thickness, or inclination of the connection portion 33b is changed stepwise or gradually. .
- the angle ⁇ does not exceed 90 degrees.
- connection part 33b may support the housing cover 40 .
- the connection part 33b may be curved upward by a sizing process. At this time, the upwardly curved connection part 33b may come into contact with the housing cover 40 .
- the connection part 33b may serve to support the housing cover 40 upward. Accordingly, the current collector 30 may be securely fixed in the vertical direction by the sizing process. Accordingly, even if vibration and/or impact occurs in the course of using the cylindrical battery 1 , it is possible to prevent the electrode assembly 10 from moving unnecessarily up and down inside the battery housing 20 .
- the upper surface of the beading part 21 and the lower surface of the beading part 21 are virtual reference planes passing through the innermost point of the beading part 21 in parallel with the bottom surface of the battery housing. may be asymmetric based on .
- the beading unit 21 when the battery housing 20 is compressed in the vertical direction by the sizing process, the beading unit 21 is also compressed in the vertical direction.
- the upper surface of the beading part 21 and the lower surface of the beading part 21 are to be asymmetrical with respect to an imaginary reference plane (refer to the dashed-dotted line) passing through the innermost point of the beading part 21.
- the press-fitting depth of the beading portion 21 may be defined as PD.
- the vertical distance from the inner surface of the battery housing 20 to the innermost point of the beading part 21 may be defined as the indentation depth PD.
- the shortest distance from the end of the contact portion 33a to the vertical line passing the innermost point of the beading portion 21 may be defined as the overlap length OV. That is, referring to FIG. 24 , the overlap length OV means the radial length of the area where the beading part 21 and the current collector 30 overlap when viewed from the top of the beading part 21 downward. do.
- the cylindrical battery 1 of the present invention may satisfy the following relational expression.
- the ratio is preferably (R1, min +W bead,min )/ PDmax or more.
- an area overlapping more than the radius of curvature R1 of the beading portion 21 is required. .
- the contact portion 33a may be in contact with the beading portion 21 only at one contact point because there is no flat section.
- the contact portion 33a cannot be stably placed on the beading portion 21 . Therefore, the contact portion 33a requires an additional overlapping area in addition to the radius of curvature R1 of the beading portion 21.
- the length of the additional overlapping area is preferably at least the weld bead width (W bead ) or more. . That is, the contact portion 33a substantially overlaps the beading portion 21 in the additional overlapping region, and welding may be performed in this region. Therefore, the length of the additional overlapping area must be at least the welding bead width (W bead ) or more, so that stable welding is possible without departing from the overlapping area. That is, the minimum overlap length for the contact portion 33a to be weldably mounted on the beading portion 21 is R1, min +W bead,min .
- the ratio is preferably (PD max -R2, min )/PD max or less.
- a radius of curvature R2 exists in a boundary region between the beading part 21 and the inner side surface of the battery housing 20 . Accordingly, when the contact portion 33a of the current collector 30 enters the boundary region between the beading portion 21 having the radius of curvature R2 and the inner side of the battery housing 20, the radius of curvature R2 is As a result, the contact portion 33a is lifted without being in close contact with the beading portion 21 . Accordingly, the maximum overlap length for the contact portion 33a to be placed in close contact on the beading portion 21 is PD max -R2, min .
- the maximum value (PD max ) of the indentation depth (PD) of the beading portion 21 may be approximately 10 mm, and the minimum values of R1, min and R2, min may each be approximately 0.05 mm, W bead, min may be approximately 0.1 mm.
- the ratio of the overlap length OV to the indentation depth PD of the beading portion 21 may satisfy a range of about 1.5 to 99.5%.
- the ratio is preferably about 1.5% or more.
- the lower limit of the OV/PD ratio is the maximum value (PD max ) of the indentation depth of the beading portion 21, the minimum value (R1, min ) of the radius of curvature (R1), and the beading portion 21 for welding of the contact portion 33a. It may be determined from the length of the minimum width of the contact portion 33a that should be in contact with the upper surface, that is, the minimum width W bead,min of the weld bead BD.
- the maximum value PD max of the indentation depth is 10 mm
- the minimum contact width of the contact portion 33a required for welding of the contact portion 33a that is, the minimum width of the weld bead BD (W bead, min ) may have a length of 0.1 mm
- a minimum value (R1, min ) of the radius of curvature R1 may be 0.05 mm.
- the point at which the contact portion 33a of the current collector 30 can contact the maximum width on the flat portion of the upper surface of the beading portion 21 is spaced apart from the inner surface of the battery housing by the radius of curvature R2. is the point that has been Accordingly, the overlap length OV becomes the maximum when the end of the contact portion 33a is located at the corresponding point.
- a welding position where the beading portion 21 and the contact portion 33a are welded may be defined as W. More specifically, the welding position W may mean a distance from the innermost point of the beading part 21 to the central point of the welding bead BD located at the outermost radial direction. At this time, the welding position (W) and the indentation depth (PD) may satisfy the following relational expression.
- the welding position W of the beading part 21 and the contacting part 33a may be determined from the overlap length of the contacting part 33a and the beading part 21 and the minimum width W bead,min of the welding bead BD.
- the weld position W is the center point of the weld bead BD.
- a welding position when the contact portion 33a is minimally spanned to the beading portion 21 may be defined as W1 .
- the overlap length at this time becomes OV min as described above.
- the welding position (W1) should be a point spaced toward the inside of the beading portion 21 by at least 0.5*W bead,min from OV min . Therefore, W1 may satisfy the following relation.
- the PD value in order for the value of W1/PD to be the minimum, the PD value must be the maximum, so the minimum value of W/PD becomes (OV min -0.5*W bead,min )/PD max .
- a welding position when the contact portion 33a maximally enters the beading portion 21 may be defined as W2 .
- the overlap length at this time becomes OV max as described above.
- the welding position (W2) should be a point spaced apart from the OV max toward the inside of the beading portion 21 by at least 0.5*W bead,min . Therefore, W2 may satisfy the following relation.
- ⁇ 1-(R2, min +0.5*W bead,min )/PD which is a value obtained by dividing (PD max -R2, min -0.5*W bead,min ) by PD ⁇ should be the maximum. That is, when the PD value is the maximum, the W2/PD value also becomes the maximum. Therefore, the maximum value of W/PD becomes (OV min -0.5*W bead,min )/PD max .
- the minimum width required to weld the contact portion 33a to the beading portion 21 may be 0.1 mm. That is, the width of 0.1 mm corresponds to the minimum width of the weld bead BD that can be formed by laser welding. Accordingly, the welding position W1 when the contact portion 33a contacts the upper surface of the beading portion 21 with a minimum width is spaced apart by (R1, min +0.5*0.1mm) from the innermost point of the beading portion 21 . corresponds to the point
- R1 and min are the minimum values of the radius of curvature R1, for example, 0.05 mm.
- a welding bead BD having a width of 0.1 mm is formed on the contact surface of the contact portion 33a and the beading portion 21 .
- the width of the weld bead BD also corresponds to the minimum contact width of the contact portion 33a.
- the welding position W1 based on the press-fitting depth PD of the beading part 21 is a point spaced apart by 0.1 mm from the innermost point of the beading part 21 .
- the end of the contact portion 33a is located at a point spaced apart from the inner surface of the battery housing by the radius of curvature (R2, min ).
- R2 and min are the minimum values of the radius of curvature R2, for example, 0.05 mm.
- the welding position W2 that can be closest to the end of the contact portion 33a is a point spaced apart by 0.05 mm from the end of the contact portion 33a.
- the welding position W2 when the contact portion 33a is in contact with the upper surface of the beading portion 21 to the maximum width is (PD-R2, min -0.05mm) spaced apart from the innermost point of the beading portion 21 by (PD-R2, min -0.05mm).
- R2, min is 0.05 mm
- the maximum value of the welding position W2 is a point spaced apart by PD-0.1 mm with respect to the innermost point of the beading part 21 .
- the cylindrical battery 1 of the present invention may satisfy the following relational expression.
- the beading part 21 has a flat section F parallel to the lower surface of the battery housing 20 in at least a partial region, and the beading part 21 is in contact with the current collector 30 .
- the length of the flat section F may be OV - R1. That is, referring to FIG. 23 , the flat section F corresponds to a length obtained by subtracting a radius of curvature R1 of the beading portion 21 from the overlap length OV.
- the radial width length of the welding pattern which is a set of weld beads BD formed between the beading portion 21 and the contacting portion 33a, is W bead ,min or more and OV - R1 or less.
- the minimum width of the weld bead BD is W bead,min
- the minimum value of the radial width length of the weld pattern formed between the beading portion 21 and the contact portion 33a is at least It should be W bead,min .
- a plurality of the welding beads BD may be formed over the entire area of the flat section F of the beading portion 21 .
- the plurality of welding beads BD may form a constant welding pattern.
- the maximum value of the radial width and length of the welding pattern formed between the beading part 21 and the contact part 33a may satisfy the following relational expression.
- the ratio of the length of the radial width of the welding pattern to the length of the flat section F may satisfy a range of about 10 to 40%. Preferably, the ratio may satisfy about 20 to 30%. When the ratio satisfies the above range, welding strength may be increased as the welding area increases. Accordingly, the cylindrical battery 1 according to the present invention can secure high impact resistance.
- the ratio of the area in which the current collector 30 does not contact the upper surface of the electrode assembly 10 to the area of a circle having the outer diameter of the electrode assembly 10 as the diameter is calculated as the current collector ( 30) can be defined as the aperture ratio.
- the aperture ratio can be calculated by the following equation.
- the aperture ratio of the current collector 30 may be, for example, about 30% or more and less than 100%, and preferably, about 60% or more and less than 100%.
- a region in which the current collector 30 comes into contact with the electrode assembly 10 includes the support part 31 . ) and the tab coupling part 32 .
- the ratio of the area in which the current collector 30 contacts the electrode assembly 10 to the area of a circle having the outer diameter of the electrode assembly 10 as the diameter may be about 70% or less, preferably may be about 40% or less.
- the electrolyte may smoothly penetrate into the electrode assembly 10 through the opening region of the current collector 30 including the current collector hole H2 when the electrolyte is injected. That is, when the aperture ratio of the current collector 30 is within the above range, the electrolyte permeates into the electrode assembly 10 through the opening area of the winding center hole H1 mass collector 30 provided in the electrode assembly 10 , , in particular, since there is a fine gap between the overlapping surfaces of the segment pieces 11a and between the adjacent segment pieces 11a, the electrolyte can smoothly permeate into the electrode assembly 10 by capillary action through the gap.
- the distance A from the center of the current collector 30 to the end of the tab coupling part 32 is from the center of the winding hole H1 of the electrode assembly 10 to the battery housing It may be formed substantially equal to or shorter than the distance B to the innermost portion of the beading portion 21 formed in (20). In this case, it is possible to prevent the beading part 21 from causing interference with the current collector 30 during the sizing process described above, whereby the beading part 21 presses the current collector 30 to the current collector and/or It is possible to prevent the electrode assembly 10 from being damaged.
- At least one welding bead W may be provided for each tab coupling portion 32 .
- the weld bead W may be formed on the support part 31 of the current collector 30 as well as the tab coupling part 32 .
- a flat part may be provided on the beading part 21 as described above.
- the welding bead (W) formed between the beading portion 21 and the first contact portion (33a) is at least one. At least one of the welding beads W may form a linear welding pattern extending in a substantially circumferential direction on the beading portion 21 . On the contrary, at least one welding bead W formed between the beading portion 21 and the first contacting portion 33a forms an arc-shaped welding pattern extending approximately in the circumferential direction on the beading portion 21 . can do.
- the weld bead W formed on the first contact portion 33a may have a shape extending in a circumferential direction. In another aspect, the welding pattern may have a line shape in which point welding is connected. In another aspect, a plurality of welding beads formed between the beading portion 21 and the first contacting portion 33a may be formed in the same contacting portion 33a.
- the first contact parts 33a provided in each of the plurality of first housing coupling parts 33 are interconnected. and can be integrally formed.
- the housing cover 40 covers the opening formed on one side of the battery housing 20 .
- the housing cover 40 may be fixed by a crimping part 22 formed on the top of the battery housing 20 .
- a sealing gasket G1 is interposed between the battery housing 20 and the housing cover 40 and between the current collector 30 and the housing cover 40 in order to improve the fixing force and the sealing property of the battery housing 20 .
- the first contact portion 33a and/or the second contact portion 34a may be interposed between the beading portion 21 of the battery housing 20 and the sealing gasket G1 .
- the first contact portion 33a and/or the second contact portion 34a interposed between the beading portion 21 and the sealing gasket G1 is bent of the crimping portion 22 extending upward from the beading portion 21 .
- the housing cover 40 is not a component that should function as a passage of current. Accordingly, if the battery housing 20 and the housing cover 40 can be firmly fixed through welding or fixing according to the application of other parts and the airtightness of the open part of the battery housing 20 can be secured, the sealing gasket G1 Application is not essential.
- the extended length of the portion interposed between the current collector 30 and the housing cover 40 of the sealing gasket G1 is interposed between the battery housing 20 and the housing cover 40 . It can be formed shorter than the extended length of the part. That is, the sealing gasket G1 surrounds the housing cover 40 , and the radial length of the portion covering the lower surface of the housing cover 40 is the radial length of the portion covering the upper surface of the housing cover 40 . It can be formed shorter.
- the sealing gasket G1 from the inside of the battery housing 20 extends too long in the direction toward the center of the cylindrical battery 1, due to interference between the sealing gasket G1 and the current collector 30, the current collector ( 30) may be deformed, and as a result, a force is applied to a welding portion between the current collector 30 and the battery housing 20 and/or a welding portion between the current collector 30 and the first uncoated portion 11 to cause cracks, etc. Structural defects may occur. Therefore, as described above, by controlling the extension length of the sealing gasket (G1), it is possible to prevent such a defect from occurring.
- the sealing gasket G1 may have a greater thickness in a region not in contact with the first contact portion 33a than in a region in contact with the first contact portion 33a.
- a compression rate in a region in contact with the first contact portion 33a may be greater than an extrusion rate in a region not in contact with the first contact portion 33a .
- the thickness of the sealing gasket G1 may be changed for each region along the circumferential direction on the beading part 21 because the region where the first contact part 33a is interposed and the region where the first contact part 33a is not interposed exist together.
- the thickness of the sealing gasket G1 can alternately increase and decrease along the circumferential direction on the beading portion 21. have.
- the compressibility of the sealing gasket G1 may be changed for each region along the circumferential direction on the beading part 21 .
- the sealing gasket (G1) has a compressibility in the area in contact with the first contact portion (33a) and the first contact portion (33a) not in contact with it.
- the compression ratios in the regions may be substantially the same. In one example, the thickness of the sealing gasket G1 not in contact with the first contact portion 33a may be increased.
- the housing cover 40 may include a venting part 41 formed to prevent an increase in internal pressure due to a gas generated inside the battery housing 20 .
- the venting part 41 is formed on a part of the housing cover 40 and corresponds to an area structurally weaker than the surrounding area so as to be easily broken when an internal pressure is applied.
- the venting part 41 may be, for example, a region having a thinner thickness compared to a peripheral region.
- the terminal 50 penetrates the battery housing 20 from the opposite side of the open part of the battery housing 20 and is electrically connected to the second uncoated region 12 of the electrode assembly 10 .
- the terminal 50 may penetrate through a substantially central portion of the lower surface of the battery housing 20 .
- the terminal 50 is, for example, coupled to a current collector (second current collector) 60 coupled to the second uncoated area 12 or a lead tab (not shown) coupled to the second uncoated area 12 . ) and may be electrically connected to the electrode assembly 10 by being combined. Accordingly, the terminal 50 may have the same polarity as the second electrode of the electrode assembly 10 and may function as the second electrode terminal T2 . When the second uncoated region 12 is a positive electrode tab, the terminal 50 may function as a positive electrode terminal.
- the terminal 50 should maintain an insulated state from the battery housing 20 having the opposite polarity.
- an insulating gasket G2 may be applied between the terminal 50 and the battery housing 20 .
- insulation may be realized by coating a portion of the surface of the terminal 50 with an insulating material.
- the second uncoated region 12 and/or the current collector (second current collector) 60 must maintain an insulating state from the battery housing 20 .
- the insulator 70 may be interposed between the second uncoated region 12 and the battery housing 20 and/or between the current collector (second current collector) 60 and the battery housing 20 .
- the terminal 50 may pass through the insulator 70 for electrical connection with the second uncoated region 12 .
- the outer surface 20a of the closing part located opposite to the opening part provided at the upper end of the battery housing 20 may function as the first electrode terminal T1.
- the first electrode terminal T1 may be a negative terminal.
- the terminal 50 exposed on the lower surface of the battery housing 20 opposite to the opening portion can be used as the second electrode terminal T2, and the battery housing ( The area occupied by the terminal 50 among the lower surfaces of 20) (including the area where the insulation gasket G2 is exposed when the insulation gasket G2 is exposed to the outside of the terminal 50 on the outer surface 20a of the closing part) It has a structure in which the remaining area except for the first electrode terminal T1 can be used. Therefore, in the cylindrical battery 1 according to the present invention, both the positive electrode and the negative electrode can be connected in one direction in electrically connecting the plurality of cylindrical batteries 1 , thereby simplifying the electrical connection structure.
- cylindrical battery 1 according to the present invention has a structure in which most of the lower surface located on the opposite side of the open part of the battery housing 20 can be used as an electrode terminal, it is sufficient to weld parts for electrical connection. It has the advantage that it is possible to secure the area.
- the current collector (first current collector) 30 includes the first uncoated portion 11 and the inner surface of the battery housing 20 . is configured to combine with The current collector 30 may include a first portion in contact with the inner surface of the battery housing 20 and a second portion coupled to the first uncoated portion 11 .
- the central region of the first part in the first part, it means approximately the central part along the circumferential direction of the electrode assembly 10) is projected onto the plane on which the second part exists, the center of the first part The region and the second portion may be spaced apart from each other in the circumferential direction of the electrode assembly 10 .
- a sealing gasket G1 may be interposed between the open portion of the battery housing 20 and the current collector 30 .
- the first portion is disposed between the inner surface of the battery housing 20 and the sealing gasket G1 . may be interposed.
- the first part may be interposed between the beading part 21 of the battery housing 20 and the sealing gasket G1.
- first part and the second part may be positioned on different planes in the direction of the winding axis of the electrode assembly 10 . That is, the first part and the second part may be spaced apart from each other along the height direction (parallel to the Z-axis) of the cylindrical battery 1 .
- the current collector (second current collector) 60 is coupled to the lower portion of the electrode assembly 10 .
- the current collector 60 is made of a conductive metal material, and is electrically coupled to the second uncoated region 12 .
- the current collector 60 may be coupled to a coupling surface (bent surface) 102 (see FIG. 15 ) formed by bending an end of the second uncoated region 12 in a direction parallel to the current collector 60 .
- the bending direction of the second uncoated region 12 may be a radial direction, for example, a direction toward the core of the electrode assembly 10 .
- the second uncoated region 12 has such a bent shape, the space occupied by the second uncoated region 12 in the vertical direction is reduced, thereby improving energy density.
- the current collector 60 is coupled to the coupling surface 102 formed by bending the second uncoated region 12 as described above, the coupling force is improved and the contact resistance is decreased due to an increase in the bonding area. This also applies to the case of the first uncoated region 11 described above.
- the current collector (second current collector) 60 includes a tab coupling part (second tab coupling part) 62 and a terminal coupling part 63 .
- the current collector 60 may further include an edge portion 61 .
- the edge part 61 is disposed under the electrode assembly 10 and may have a substantially rim shape in which an empty space S is formed. In the drawings of the present invention, only the case in which the rim portion 61 has a substantially circular rim shape is illustrated, but the present invention is not limited thereto.
- the rim portion 61 may have a substantially rectangular rim shape, a hexagonal rim shape, an octagonal rim shape, or other rim shape, unlike shown.
- the tab coupling part 62 may extend inwardly from the edge part 61 and is coupled to the second uncoated part 12 .
- the coupling between the current collector 60 and the second uncoated region 12 is such that the number of overlapping layers of the fragment fragments overlaps by at least about 50% or more with the uniform number of stacking sections maintained approximately constant while exhibiting approximately the maximum value. it is preferable That is, the tab coupling portion 62 of the current collector 60 may be coupled to the second uncoated portion 12 so as to overlap the uniform number of stacking sections by at least about 50% or more.
- the terminal coupling part 63 is spaced apart from the tab coupling part 62 .
- the terminal coupling part 63 may be located inside the edge part 61 .
- the terminal coupling part 63 may be coupled to a terminal 50 to be described later by welding.
- the terminal coupling portion 63 may have substantially the same diameter as the flat portion formed on the bottom surface of the terminal 50, or It may have a larger diameter.
- the terminal coupling part 63 may be located, for example, approximately at the center of the inner space surrounded by the edge part 61 .
- the terminal coupling part 63 may be disposed at a position corresponding to the winding hole H1 formed in the core part of the electrode assembly 10 .
- the terminal coupling part 63 may be configured to cover the winding hole H1 of the electrode assembly 10 so that the winding hole H1 of the electrode assembly 10 is not exposed to the outside.
- the terminal coupling part 63 may have a larger diameter or width than the winding hole H1 as described above.
- the present invention does not exclude the case where the diameter of the terminal coupling part 63 is smaller than the diameter of the flat part formed on the bottom surface of the terminal 50 .
- the tab coupling part 62 and the terminal coupling part 63 are not directly connected, but are spaced apart from each other and are electrically connected by the edge part 61 .
- the current collector 60 of the present invention has a structure in which the tab coupling part 62 and the terminal coupling part 63 are not directly connected to each other, but indirectly connected through the edge part 61, so that the cylindrical battery 1 ) to disperse the impact applied to the coupling portion between the tab coupling portion 62 and the second uncoated portion 12 and the coupling portion between the terminal coupling portion 63 and the terminal 50 when shock and/or vibration is applied to the can Accordingly, the current collector 60 of the present invention can minimize or prevent damage to the welded portion due to external impact.
- connection portion of the edge portion 61 and the terminal coupling portion 63 when an external shock is transmitted to the inside of the battery 1 through the terminal 50, at the connection portion of the edge portion 61 and the terminal coupling portion 63. It has a structure in which stress can be concentrated. However, such a connection portion is not a portion where a welding portion for bonding between parts is formed. Therefore, in the present invention, it is possible to effectively prevent the occurrence of product defects due to damage to the welding part due to external impact.
- An outer diameter of the current collector (second current collector) 60 may be formed to be longer than that of the current collector (first current collector) 30 .
- the outer diameter of the second current collector 60 is the distance from the center of the second current collector 60 to the end of the second tab coupling part 62 (the second current collector 60 is the edge part 61 ) When provided, it means a length corresponding to twice the distance to the edge portion 61).
- the outer diameter of the first current collector 30 means a length corresponding to twice the distance from the center of the first current collector 30 to the outermost portion of the first tab coupling part 32 .
- the second current collector 60 may have an outer diameter close to the inner diameter of the battery housing 20 .
- the second current collector 60 may have an outer diameter in the range of about 33% to 98.5% of the inner diameter of the battery housing 20 .
- the minimum value of the outer diameter of the second current collector 60 is a value to prevent an excessive increase in resistance.
- the maximum value of the outer diameter of the second current collector 60 is, for example, a tolerance of the outer diameter of the second current collector 60 that may be generated when the current collector 60 is manufactured, the electrode assembly 10 and the second collector Assembling tolerance that occurs when the entire 60 is combined, tolerance of the inner diameter of the battery housing 20 that may occur when manufacturing the battery housing 20, and the assembly of the electrode assembly 10 and the second current collector 60 This is in consideration of positional tolerances that may occur when inserted into the battery housing 20 .
- the space for insertion of the insulator 70 must be further considered, so the battery housing ( The ratio of the outer diameter of the second current collector 60 to the inner diameter of 20) becomes smaller than the maximum value. While the size of the outer diameter of the second current collector 60 is limited at a level that is formed to be minutely smaller than the inner diameter of the battery housing 20 in consideration of this tolerance, in the case of the first current collector 30 , the sizing ), its diameter can be further limited to avoid possible interference during processing. In order to avoid such interference, the outer diameter of the first current collector 30 may be approximately equal to or shorter than the inner diameter in the region where the beading portion 21 of the battery housing 20 is formed.
- the outer diameter of the first current collector 30 and/or the second current collector 60 is referred to as T
- the outer diameter of the electrode assembly 10 is referred to as JR
- the segment of the first uncoated region 11 is referred to as And/or when the height of the outermost segment of the second uncoated region 12 is F
- the outer diameter of the first current collector 30 means twice the distance from the center of the first current collector 30 to the end of the first tab coupling part 32
- the second current collector means twice the distance from the center of the second current collector 60 to the end of the second tab coupling part 62 (or the outermost part of the edge part 61 ).
- the outer diameter T of the first current collector 30 and/or the second current collector 60 is the segment of the first uncoated region 11 from the outer diameter JR of the electrode assembly 10 . It may be greater than or equal to the length obtained by subtracting the height F of the outermost segment of (11a) and/or the second uncoated region 12 twice.
- the first tab coupling part 32 and/or the second tab coupling part 62 cover the end of the outermost segment 11a. That is, the first current collector 30 and/or the second current collector 60 may have an outer diameter that covers the end of the segment bent at the last winding turn of the first electrode.
- the tight lamination state means a state in which there is substantially no gap between the segment pieces as shown in FIG. 8 .
- the tight stacking state contributes to lowering the resistance of the cylindrical battery 1 to a level suitable for rapid charging (eg, 4 milliohm) or less.
- the outer diameter T of the first current collector 30 and/or the second current collector 60 may be smaller than the outer diameter JR of the electrode assembly 10 . If the outer diameter T of the first current collector 30 and/or the second current collector 60 is greater than the outer diameter JR of the electrode assembly 10 , a dead space inside the battery housing 20 . ) may increase to adversely affect the energy density of the cylindrical battery 1 . Accordingly, the outer diameter T of the first current collector 30 and/or the second current collector 60 is preferably smaller than the outer diameter JR of the electrode assembly 10 .
- the length L2 of the welding portion coupling the second tab coupling portion 62 and the second uncoated portion 12 of the second current collector 60 in the radial direction of the electrode assembly 10 is , a welding portion coupling between the first tab coupling portion 32 and the first uncoated portion 11 of the first current collector 30 is longer than the length L1 extending in the radial direction of the electrode assembly 10 . can be formed.
- the second current collector 60 is a positive current collector made of aluminum and the first current collector 30 is a negative current collector made of copper
- the length L2 is formed longer than the length L1
- the extended length of the welding portion coupling the current collectors 30 and 60 and the uncoated regions 11 and 12 means the extended length of the weld bead formed by welding.
- the distance from the core of the electrode assembly 10 to the starting point of the welding part connecting the first tab coupling part 32 of the first current collector 30 and the first uncoated part 11 to the starting point is a distance.
- the distance may be substantially the same.
- substantially the same may mean that the two distances are equal to each other or have a deviation of, for example, about 5% or less.
- the current collector 60 may further include a bridge part 64 extending inwardly from the edge part 61 and connected to the terminal coupling part 63 .
- the bridge portion 64 may include a tapered portion 64a whose width is continuously and/or gradually narrowed in a direction from the inner surface of the edge portion 61 toward the terminal coupling portion 63 .
- the tapered portion 64a may have a shape in which the width of the terminal coupling portion 63 and the edge portion 61 is continuously and/or gradually widened in a direction from the connection portion toward the edge portion 61 .
- the rigidity of the component at the connection portion between the bridge portion 64 and the edge portion 61 may be improved.
- the tapered portion 64a When the tapered portion 64a is provided, in the manufacturing process of the cylindrical battery 1, for example, the current collector 60 and/or the current collector ( 60) and the electrode assembly 10 can be easily and safely transported. That is, when the tapered part 64a is provided, it is possible to prevent the occurrence of product defects that may be caused by gripping parts that are welded with other parts, such as the tab coupling part 62 or the terminal coupling part 63 . have.
- the tab coupling part 42 and/or the bridge part 44 may be provided in plurality.
- the number of the tab coupling portions 42 and/or the bridge portions 44 may be determined in consideration of a resistance level required for the cylindrical battery 1 , an aperture ratio concave to the current collector 60 , and the like.
- the bridge part 64 may include a current blocking part N formed to partially reduce the cross-sectional area of the bridge part 64 .
- a reduction in the cross-sectional area of the bridge portion 64 in the region where the current blocking portion N is formed may be realized, for example, through partial reduction in width and/or thickness.
- the electrical resistance in the region where the current blocking unit (N) is formed increases, thereby causing a break in the current blocking unit (N) when overcurrent occurs, so that the current blocking unit (N) is rapidly cut off it becomes possible
- a plurality of the current blocking units N may be provided along the longitudinal direction of the bridge unit 64 .
- the current blocking part may be provided in at least one of the plurality of bridge parts 64 .
- the current blocking part N has a notch shape is illustrated, but the present invention is not limited thereto, and for example, it may be formed in a groove shape and/or a through hole shape.
- a tape having a shape surrounding the bridge part 64 may be applied to the region where the current blocking part N is formed. When the tape is applied, it is possible to prevent a foreign material such as a metal molten material generated when a break occurs in the current blocking unit N from splashing onto other parts and causing a short circuit or the like. In addition, since heat generated by the current blocking unit N is not transferred to the outside, the current blocking unit N may be more rapidly broken.
- the current blocking part N corresponds to the uniform number of layers of the second uncoated part 12 described above. It is preferable to be provided in the area. This is because, in this region, the number of overlapping layers of the fragments of the second uncoated region 12 is maintained to a maximum, whereby the overlapped fragments can function as a mask.
- the current blocking part N may be formed, for example, at a point approximately 40% to 90% away from the core of the electrode assembly 10 in a radial direction based on the radius of the electrode assembly 10 .
- the current blocking part N may be located approximately at the center between the core part and the outermost part of the electrode assembly 10 .
- the structure of the electrode assembly 10 will be described in more detail with reference to FIGS. 27 to 30 .
- the first electrode among the first and second electrodes described above will be described as an example, but the structure of the first electrode may be equally applied to the second electrode.
- the first electrode 110 includes a sheet-shaped first electrode current collector 111 made of a foil made of a conductive material, and at least one surface of the first electrode current collector 111 . It includes the formed first active material layer 112 and the first uncoated region 11 formed by not coating the active material on the long side end of the first electrode current collector 111 .
- the first uncoated region 11 may include a plurality of notched fragments 11a.
- the plurality of segment pieces 11a form a plurality of groups, and the segment pieces 11a belonging to each group may have substantially the same height (length in the Z direction) and/or width (length in the X direction) and/or the spacing pitch. have.
- the number of segments 11a belonging to each group may be increased or decreased than illustrated.
- the segment 11a has a geometric shape in which at least one straight line and/or at least one curved line are combined.
- the segment 11a may have a trapezoidal shape, and may be deformed into a quadrangle, a parallelogram, a semicircle, or a semiellipse.
- the height of the segment 11a may be increased step by step along one direction parallel to the winding direction of the electrode assembly 10 , for example, from the core side to the outer circumferential side.
- the core-side uncoated region 11-1 adjacent to the core side of the electrode assembly 10 may not include the segment 11a, and the height of the core-side uncoated region 11-1 may be different from that of the other region. may be lower than wealth.
- the outer uncoated region 11 - 2 adjacent to the outer periphery of the electrode assembly 10 may not include the segment 11a , and the height of the outer uncoated region 11 - 2 is different from that of the uncoated region. may be lower.
- the first electrode 110 may include an insulating coating layer E covering the boundary between the active material layer 112 and the first uncoated region 11 .
- the insulating coating layer (E) includes an insulating polymer resin, and may optionally further include an inorganic filler.
- the insulating coating layer (E) prevents the end of the active material layer 112 from contacting the opposite polarity active material layer through the separator, and structurally supports the bending of the fragment 11a. .
- the electrode assembly 10 may be manufactured by the winding method described with reference to FIG. 2 .
- the protruding structures of the uncoated regions 11 and 12 extending outside the separator are detailed and illustrated, and the winding structure of the first electrode, the second electrode, and the separator is omitted.
- the first uncoated region 11 protruding upwardly extends from the first electrode
- the second uncoated region 12 protruding downwardly extends from the second electrode.
- a pattern in which the height of the uncoated regions 11 and 12 changes is schematically illustrated. That is, the heights of the uncoated areas 11 and 12 may vary irregularly depending on the position at which the cross-section is cut. For example, when the side portion of the trapezoidal segment 11a is cut, the height of the uncoated region in the cross section is lower than the height of the segment 11a. Accordingly, it should be understood that the heights of the uncoated areas 11 and 12 shown in the drawing showing the cross-section of the electrode assembly 10 correspond to the average of the heights of the uncoated areas included in each winding turn.
- the uncoated regions 11 and 12 may be bent along the radial direction of the electrode assembly 10 , for example, from the outer periphery to the core.
- a region where bending occurs is indicated by a dotted line box in FIG. 28 .
- the bent surfaces 102 are formed on the upper and lower portions of the electrode assembly 10 as the radially adjacent segments overlap in multiple layers.
- the core-side uncoated region 11-1 in FIG. 27 is not bent due to its low height, and the height (h) of the innermost bent segment 11a is the core-side uncoated region 11 having no segment structure.
- the hole formed in the core C of the electrode assembly 10 is not closed.
- the hole is not closed, there is no difficulty in the electrolyte injection process, and the electrolyte injection efficiency can be improved.
- by inserting a welding tool through the hole it is possible to easily perform welding of the terminal 50 and the second current collector 60 (refer to FIG. 13 ).
- the plurality of cylindrical batteries 1 may be connected in series and in parallel at the top of the cylindrical battery 1 using a bus bar 150 .
- the number of cylindrical cells 1 may be increased or decreased in consideration of the capacity of the battery pack.
- the terminal 50 may have a positive polarity and the outer surface 20a of the closure of the cell housing 20 may have a negative polarity.
- the reverse is also possible.
- the terminal 50 of the cylindrical battery 1 and the outer surface 20a of the closure located opposite to the opening of the battery housing 20 may all face upward (as opposed to the upper and lower sides shown in FIG. 1 ). is the inverted shape).
- the plurality of cylindrical cells 1 may be arranged in a plurality of columns and rows. Columns are up and down with respect to the ground, and rows are left and right with respect to the ground.
- the cylindrical cells 1 may be arranged in a closest packing structure. The tightest packing structure is formed when an equilateral triangle is formed when the centers of the terminal exposed portions of the terminal 50 exposed to the outside of the battery housing 20 are connected to each other.
- the bus bar 150 may be disposed at the top of the plurality of cylindrical cells 1, more preferably between adjacent rows. Alternatively, the bus bars 150 may be disposed between adjacent rows.
- the bus bar 150 connects the cells 1 arranged in the same row in parallel to each other, and the cylindrical cells 1 arranged in two adjacent rows are connected in series with each other.
- the bus bar 150 may include a body portion 151 , a plurality of first bus bar terminals 152 , and a plurality of second bus bar terminals 153 for serial and parallel connection.
- the body portion 151 may extend between terminals 50 of adjacent cylindrical cells 1 , preferably between rows of cylindrical cells 1 . Alternatively, the body portion 151 may extend along the row of the cylindrical cells 1 and may be regularly bent like a zigzag shape.
- the plurality of first bus bar terminals 152 may protrude from one side of the body portion 151 toward the terminal 50 of each cylindrical battery 1 and may be electrically coupled to the terminal 50 . Electrical coupling between the first bus bar terminal 152 and the terminal 50 may be performed by laser welding, ultrasonic welding, or the like.
- the plurality of second bus bar terminals 153 may be electrically coupled to the outer surface 20a of each cylindrical battery 1 from the other side of the body portion 151 . The electrical coupling between the second bus bar terminal 153 and the outer surface 20a may be performed by laser welding, ultrasonic welding, or the like.
- the body portion 151, the plurality of first bus bar terminals 152 and the plurality of second bus bar terminals 153 may be formed of one conductive metal plate.
- the metal plate may be, for example, an aluminum plate or a copper plate, but the present invention is not limited thereto.
- the body portion 151, the plurality of first bus bar terminals 152 and the second bus bar terminals 153 may be manufactured as separate pieces and then coupled to each other through welding or the like.
- the bus bar 150 is It is possible to easily implement the electrical connection of the cylindrical batteries (1) using the.
- the coupling area of the bus bar 150 is sufficiently secured to include the cylindrical battery 1 .
- the resistance of the battery pack can be sufficiently lowered.
- the cylindrical cell can be, for example, a cylindrical cell in which the ratio of the form factor (defined as the diameter of the cylindrical cell divided by the height, i.e. the ratio of the height H to the diameter ⁇ ) is greater than about 0.4. .
- the form factor means a value indicating the diameter and height of the cylindrical battery.
- the cylindrical battery according to an embodiment of the present invention may be, for example, a 46110 battery, a 4875 battery, a 48110 battery, a 4880 battery, or a 4680 battery.
- the first two numbers represent the diameter of the cell, and the following numbers represent the height of the cell.
- the cylindrical battery according to an embodiment of the present invention may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of about 0.418.
- a cylindrical battery according to another embodiment may be a cylindrical 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 cylindrical battery according to another embodiment may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of about 0.436.
- a cylindrical battery according to another embodiment may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of about 0.600.
- a cylindrical battery according to another embodiment may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of about 0.575.
- cells 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.
- 1865 cell its diameter is approximately 18 mm
- its height is approximately 65 mm
- the form factor ratio is approximately 0.277.
- 2170 cell its diameter is approximately 21 mm
- its height is approximately 70 mm
- the form factor ratio is approximately 0.300.
- the cylindrical battery 1 of the present invention has a structure in which resistance is minimized through expansion of contact areas between components, multiplexing of current paths, and minimization of current path lengths.
- the AC resistance of the cylindrical battery 1 measured through a resistance meter between the positive and negative electrodes, that is, between the upper surface of the terminal 40 and the outer surface 20a of the closure of the battery housing 20, is approximately 4 It may be less than or equal to milliohms.
- the AC resistance of the cylindrical battery 1 may be about 0.5 milliohm or more, preferably about 1.0 milliohm or more.
- the battery pack 3 includes a battery assembly in which a plurality of cylindrical batteries 1 according to an embodiment of the present invention are electrically connected as described above, and a battery pack for accommodating them.
- pack housing (2) In the drawings of the present invention, components such as a bus bar, a cooling unit, and a power terminal for electrical connection are omitted for convenience of illustration.
- the electrical connection structure of the plurality of cells 1 for manufacturing the battery pack 3 has been exemplarily described above with reference to FIG. 31 .
- a vehicle 5 may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and includes a battery pack 3 according to an embodiment of the present invention.
- the vehicle 5 includes a four-wheeled vehicle and a two-wheeled vehicle. The vehicle 5 operates by receiving power from the battery pack 3 according to an embodiment of the present invention.
- resistance can be greatly reduced in electrically connecting the electrode assembly and the battery housing.
- it is possible to improve the bonding strength of the bonding portion between the current collector and the battery housing.
- it is possible to improve the energy density of the cylindrical battery.
- in manufacturing a cylindrical battery it is possible to increase the convenience of a welding process for electrical connection between the battery housing and the current collector, thereby improving productivity.
- even when vibration and shock are applied in the household where the battery is used it is possible to greatly reduce the possibility of damage to the welding site between the current collector and the electrode assembly and/or the welding site between the current collector and the battery housing. have.
- the convenience of a welding process for electrical connection between the battery housing and the current collector is improved, thereby improving productivity.
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- Sealing Battery Cases Or Jackets (AREA)
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Abstract
Description
Claims (131)
- 제1 전극 및 제2 전극과 이들 사이에 개재된 분리막이 권취 축을 중심으로 권취되어 코어와 외주면을 정의한 전극 조립체로서, 상기 제1 전극은 권취 방향을 따라 활물질층이 코팅되어 있지 않은 제1 무지부를 포함하는 전극 조립체;일 측에 개방부를 구비하고 상기 개방부를 통해 상기 전극 조립체를 수용하는 전지 하우징;상기 전극 조립체의 상부에 배치되는 지지부, 상기 지지부로부터 연장되어 상기 제1 무지부와 결합되는 제1 탭 결합부 및 상기 지지부로부터 연장되어 상기 전지 하우징의 내면 상에 전기적으로 결합되는 제1 하우징 결합부를 포함하는 제1 집전체; 및상기 개방부를 밀폐하는 하우징 커버;를 포함하는 전지.
- 제1항에 있어서,상기 제1 탭 결합부와 상기 제1 하우징 결합부는 직접 연결되지 않고, 상기 지지부를 통해 간접적으로 연결되는 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 전지 하우징은,상기 개방부에 인접한 단부에 형성되며 내측을 향해 압입된 비딩부를 구비하는 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 제1 탭 결합부는,적어도 하나의 주액 홀을 구비하는 것을 특징으로 하는 전지.
- 제3항에 있어서,상기 제1 하우징 결합부는,상기 전지 하우징의 비딩부 상에 결합되는 제1 접촉부; 및상기 지지부와 상기 제1 접촉부 사이를 연결하는 제1 연결부;를 포함하는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 연결부는,적어도 일부가 상기 제1 무지부와 접촉하도록 배치된 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 연결부 및 제1 접촉부는 연장 방향을 따라 동일한 폭을 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 탭 결합부는,상기 제1 연결부보다 큰 폭을 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 접촉부는,상기 제1 연결부보다 큰 폭을 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 연결부는,상기 제1 연결부의 길이 방향 양 단부 사이를 연결한 가상의 직선을 기준으로 상방으로 볼록한 구조를 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 연결부는,상기 비딩부보다 상방으로 융기된 구조를 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 비딩부는,압입되어 내입된 최 내측 지점을 중심으로 상방에 위치한 상부 비딩부; 및압입되어 내입된 최 내측 지점을 중심으로 하방에 위치한 하부 비딩부;를 포함하는 것을 특징으로 하는 전지.
- 제12항에 있어서,상기 상부 비딩부 및 상기 하부 비딩부는,상기 비딩부의 최 내측 지점을 상기 전지 하우징의 바닥면과 평행하게 통과하는 가상의 기준 평면을 기준으로 비대칭인 것을 특징으로 하는 전지.
- 제12항에 있어서,상기 제1 집전체의 적어도 하나의 제1 탭 결합부는,상기 하부 비딩부보다 더 하측에 위치하는 것을 특징으로 하는 전지.
- 제12항에 있어서,상기 상부 비딩부 및 상기 하부 비딩부 중 적어도 어느 하나는,상기 전지 하우징의 하면과 소정 각도를 이루며 경사진 것을 특징으로 하는 전지.
- 제15항에 있어서,상기 제1 접촉부는,상기 비딩부의 경사진 상면 상에 안착되는 것을 특징으로 하는 전지.
- 제12항에 있어서,상기 상부 비딩부 및 상기 하부 비딩부 중 적어도 어느 하나는,적어도 일부 영역에서 상기 전지 하우징의 하면과 평행한 것을 특징으로 하는 전지.
- 제17항에 있어서,상기 제1 접촉부는,상기 비딩부의 평탄한 상면 상에 안착되는 것을 특징으로 하는 전지.
- 제12항에 있어서,상기 제1 접촉부는,상기 비딩부의 상면에 용접 결합되는 것을 특징으로 하는 전지.
- 제12항에 있어서,상기 제1 접촉부는,상기 상부 비딩부 상에 형성되는 평탄한 영역 내에 용접 결합되는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 접촉부는,적어도 일부가 상기 전지 하우징의 비딩부를 따라 원주 방향으로 연장되는 호 형태를 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 접촉부는,상기 제1 연결부와 상기 제1 접촉부의 교차 지점으로부터, 상기 비딩부 상에서 원주 방향을 따라 서로 반대 방향으로 연장되는 호 형태를 갖는 것을 특징으로 하는 전지.
- 제3항에 있어서,상기 비딩부의 압입 깊이를 PD라고 하고,상기 비딩부의 곡률 반경의 최소값을 R1,min 이라고 하고,용접 비드 폭의 최소값을 Wbead,min 이라고 하고,상기 비딩부와 상기 전지 하우징의 내 측면 사이의 경계 영역에서의 곡률 반경의 최소값을 R2,min 라고 했을 때,PD ≥ R1,min+R2,min+Wbead,min를 만족하는 것을 특징으로 하는 전지.
- 제3항에 있어서,상기 비딩부의 압입 깊이는,0.2 ~ 10 mm 인 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 비딩부의 압입 깊이를 PD라고 하고, 상기 압입 깊이의 최대 값을 PDmax라고 하고,상기 제1 접촉부의 단부로부터 상기 비딩부의 최 내측 지점을 지나는 수직선 까지의 최단 거리인 오버랩 길이를 OV라고 하고,상기 비딩부의 곡률 반경의 최소값을 R1,min 이라고 하고,용접 비드 폭의 최소값을 Wbead,min 이라고 하고,상기 비딩부와 상기 전지 하우징의 내 측면 사이의 경계 영역에서의 곡률 반경의 최소값을 R2,min 라고 했을 때,(R1,min+Wbead,min)/PDmax ≤ OV/PD ≤ (PDmax-R2,min)/PDmax를 만족하는 것을 특징으로 하는 전지.
- 제19항에 있어서,상기 제1 접촉부와 상기 비딩부 사이의 용접 영역은,상기 비딩부의 평탄한 상면보다 좁게 형성되어 있는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 비딩부의 압입 깊이를 PD라고 하고, 상기 압입 깊이의 최대 값을 PDmax라고 하고,상기 비딩부의 최 내측 지점으로부터, 반경 방향으로 최외곽에 위치하는 용접 비드의 중앙 지점까지의 거리를 W라고 하고,상기 제1 접촉부의 단부로부터 상기 비딩부의 최 내측 지점을 지나는 수직선 까지의 최단 거리인 오버랩 길이를 OV라고 하고, OV의 최소값을 OVmin 이라고 하고 OV의 최대값을 OVmax 라고 하고,용접 비드 폭의 최소값을 Wbead,min 이라고 했을 때,(OVmin-0.5*Wbead,min)/PDmax ≤ W/PD ≤ (OVmax-0.5*Wbead,min)/PDmax를 만족하는 것을 특징으로 하는 전지.
- 제27항에 있어서,상기 비딩부의 최 내측 지점으로부터 반경 방향으로 최외곽에 위치하는 용접 비드의 중앙 지점까지의 거리의 최소 값을 W1라고 하고,오버랩 길이가 OV일 때의 상기 비딩부의 최 내측 지점으로부터 반경 방향으로 최외곽에 위치하는 용접 비드의 중앙 지점까지의 거리를 W라고 했을 때,W1 = R1 + 0.5 * Wbead,minW = OV - 0.5 * Wbead,min를 만족하는 것을 특징으로 하는 전지.
- 제27항에 있어서,상기 비딩부는 적어도 일부 영역에서 상기 전지 하우징의 하면과 평행한 평탄 구간을 갖고,상기 제1 집전체와 접촉하는 상기 비딩부의 상기 평탄 구간의 길이는,오버랩 길이가 OV이고,상기 비딩부의 곡률 반경이 R1일 때,OV - R1 인 것을 특징으로 하는 전지.
- 제29항에 있어서,상기 비딩부와 상기 제1 접촉부 사이에 형성되는 용접 패턴의 반경 방향 폭 길이는,Wbead,min 이상 OV - R1 이하인 것을 특징으로 하는 전지.
- 제30항에 있어서,상기 평탄 구간의 길이 대비 상기 용접 패턴의 반경 방향 폭 길이의 비율은,10 ~ 40 % 의 범위를 만족하는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 연결부는,연장 방향이 적어도 1회 전환되는 적어도 하나의 제1 밴딩부를 구비하는 것을 특징으로 하는 전지.
- 제32항에 있어서,상기 제1 밴딩부는,상기 제1 접촉부의 일 단부와 상기 제1 탭 결합부의 일 단부를 연결한 가상의 직선의 중심을 지나며 상기 전지 하우징의 바닥면과 평행한 가상의 평면보다 상방에 위치하는 것을 특징으로 하는 전지.
- 제32항에 있어서,상기 적어도 하나의 제1 밴딩부는,상기 전지 하우징의 길이 방향 축을 따라 보았을 때, 서로 겹쳐지지 않도록 둔각으로 절곡되어 있는 것을 특징으로 하는 전지.
- 제32항에 있어서,상기 제1 접촉부와 상기 제1 연결부의 경계 지점은,둔각으로 절곡되어 있는 것을 특징으로 하는 전지.
- 제34항에 있어서,상기 제1 연결부는,상기 비딩부를 향해 갈수록 그 경사가 단계적 또는 점진적으로 감소하는 형태를 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 탭 결합부와 상기 제1 연결부 사이의 각도는,0 ~ 90 도 사이인 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 연결부는,상기 하우징 커버를 지지하는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 탭 결합부와 상기 제1 접촉부는,실질적으로 동일 높이에 위치하는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 접촉부는,상기 개방부 측을 향하는 상기 비딩부의 상면과 결합되는 평탄면을 구비하는 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 제1 집전체는,그 중심부에 형성되는 집전체 홀을 구비하는 것을 특징으로 하는 전지.
- 제41항에 있어서,상기 집전체 홀은,상기 전극 조립체의 중심부에 형성되는 권취 홀과 대응되는 위치에 구비되는 것을 특징으로 하는 전지.
- 제42항에 있어서,상기 집전체 홀의 직경은,상기 전극 조립체의 코어에 구비된 권취 홀의 직경보다 크거나 같은 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 제1 집전체는,상기 제1 탭 결합부의 단부로부터 연장되어 상기 전지 하우징의 내측 면 상에 결합되는 제2 하우징 결합부;를 더 포함하는 것을 특징으로 하는 전지.
- 제44항에 있어서,상기 제2 하우징 결합부는,상기 전지 하우징의 내측 면 상에 결합되는 제2 접촉부; 및상기 제1 탭 결합부의 단부와 상기 제2 접촉부 사이를 연결하는 제2 연결부;를 포함하는 것을 특징으로 하는 전지.
- 제44항에 있어서,상기 제2 연결부는,적어도 일부가 상기 제1 무지부와 접촉하도록 배치되는 것을 특징으로 하는 전지.
- 제44항에 있어서,상기 제1 탭 결합부, 제2 연결부 및 제2 접촉부는 연장 방향을 따라 동일한 폭을 갖는 것을 특징으로 하는 전지.
- 제44항에 있어서,상기 제1 탭 결합부는,상기 제2 연결부보다 큰 폭을 갖는 것을 특징으로 하는 전지.
- 제44항에 있어서,상기 제2 접촉부는,상기 제2 연결부보다 큰 폭을 갖는 것을 특징으로 하는 전지.
- 제45항에 있어서,상기 제2 접촉부는,적어도 일부가 상기 전지 하우징의 내주면을 따라 연장된 형태를 갖는 것을 특징으로 하는 전지.
- 제45항에 있어서,상기 제2 연결부는,연장 방향이 적어도 1회 전환되는 제2 밴딩부를 적어도 하나 구비하는 것을 특징으로 하는 전지.
- 제3항에 있어서,상기 제1 집전체의 중심부로부터 상기 제1 탭 결합부의 단부에 이르는 거리는 상기 전극 조립체의 권취 홀의 중심부로부터 상기 비딩부의 최 내측부에 이르는 거리와 실질적으로 동일하거나 더 짧은 것을 특징으로 하는 전지.
- 제3항에 있어서,상기 비딩부의 상면에는 평탄부가 구비되는 것을 특징으로 하는 전지.
- 제20항에 있어서,상기 비딩부와 상기 제1 접촉부 사이에 형성되는 용접 비드는 적어도 하나 이상이고,적어도 하나의 상기 용접 비드는, 원주 방향을 따라 연장되는 직선 형상의 용접 패턴을 형성하는 것을 특징으로 하는 전지.
- 제20항에 있어서,상기 비딩부와 상기 제1 접촉부 사이에 형성되는 용접 비드는 적어도 하나 이상이고,적어도 하나의 상기 용접 비드는, 원주 방향을 따라 연장되는 호 형상의 용접 패턴을 형성하는 것을 특징으로 하는 전지.
- 제20항에 있어서,상기 비딩부와 상기 제1 접촉부 사이에 형성되는 용접 비드는, 용접 패턴을 형성하고,상기 용접 패턴은 점 용접이 연결된 선 형태를 갖는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 비딩부와 상기 제1 접촉부 사이에 형성되는 용접 비드는,동일 제1 접촉부 내에 복수 개 형성되는 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 제2 전극은 권취 방향을 따라 활물질층이 코팅되어 있지 않은 제2 무지부를 더 포함하고,상기 전지는, 상기 개방부의 반대 편에서 상기 전지 하우징을 관통하여 상기 제2 무지부와 전기적으로 연결되는 단자; 를 더 포함하는 것을 특징으로 하는 전지.
- 제58항에 있어서,상기 전극 조립체와 상기 단자 사이에 위치하는 제2 집전체를 더 포함하며,상기 제2 집전체는,상기 제2 무지부와 결합되는 제2 탭 결합부; 및상기 단자와 결합되는 단자 결합부;를 포함하는 것을 특징으로 하는 전지.
- 제59항에 있어서,상기 단자 결합부는,상기 전극 조립체의 권취 홀을 커버하는 것을 특징으로 하는 전지.
- 제59항에 있어서,상기 제2 집전체의 외경은,상기 제1 집전체의 외경보다 큰 것을 특징으로 하는 전지.
- 제59항에 있어서,상기 제2 탭 결합부는,상기 제2 무지부의 절곡에 의해 형성된 결합면 상에 결합되어 있는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 전지 하우징은,상기 비딩부의 상부에 형성되며, 상기 하우징 커버의 가장자리 둘레를 감싸도록 연장 및 밴딩되는 클림핑부를 구비하는 것을 특징으로 하는 전지.
- 제63항에 있어서,상기 제1 하우징 결합부는,상기 클림핑부에 의해 압착 고정되는 것을 특징으로 하는 전지.
- 제63항에 있어서,상기 전지는,상기 클림핑부 내에 배치되며, 상기 전지 하우징과 상기 하우징 커버 사이에 개재되는 실링 가스켓을 더 포함하는 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 제1 접촉부는,상기 비딩부와 상기 실링 가스켓 사이에 개재되는 것을 특징으로 하는 전지.
- 제66항에 있어서,상기 제1 접촉부는,상기 클림핑부의 절곡에 의해 고정되는 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 실링 가스켓은,상기 제1 접촉부와 접촉하는 영역보다, 상기 제1 접촉부와 접촉하지 않는 영역에서 더 큰 두께를 갖는 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 실링 가스켓은,상기 제1 접촉부와 접촉하는 영역에서의 압축률이, 상기 제1 접촉부와 접촉하지 않는 영역에서의 압축률보다 더 큰 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 실링 가스켓은,상기 제1 접촉부와 접촉하는 영역에서의 압축률과 상기 제1 접촉부와 접촉하지 않는 영역에서의 압축률이 실질적으로 동일한 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 실링 가스켓은,상기 비딩부 상에서 원주 방향을 따라 영역별로 그 두께가 변하는 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 실링 가스켓은,상기 비딩부 상에서 원주 방향을 따라 그 두께가 증가와 감소를 교차로 반복하는 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 실링 가스켓은,상기 비딩부 상에서 원주 방향을 따라 영역별로 그 압축률이 변하는 것을 특징으로 하는 전지.
- 제3항에 있어서,상기 제1 하우징 결합부는,상기 비딩부 상에 탄성 바이어스 되어 있는 것을 특징으로 하는 전지.
- 제31항에 있어서,상기 제1 접촉부와 상기 제1 연결부의 연결 부위는,상기 비딩부의 내측 면과 형합되는 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 제1 무지부의 적어도 일부는, 상기 전극 조립체의 권취 방향을 따라 분할된 복수의 분절편을 포함하고,상기 복수의 분절편은 상기 전극 조립체의 반경 방향을 따라 밴딩되어 절곡면을 형성하는 것을 특징으로 하는 전지.
- 제76항에 있어서,밴딩된 상기 복수의 분절편은,여러 겹으로 중첩되면서 절곡면을 형성하고,상기 절곡면은, 상기 전극 조립체의 외주측으로부터 코어측으로 가면서 분절편의 중첩 레이어 수가 최대치까지 순차적으로 증가하는 적층수 증가구간과 중첩 레이어 수가 최대치가 된 반경 지점부터 최내측 분절편이 존재하는 반경 지점까지의 적층수 균일구간을 포함하는 것을 특징으로 하는 전지.
- 제77항에 있어서,상기 제1 탭 결합부는,상기 적층수 균일구간과 중첩되도록 상기 절곡면에 결합되는 것을 특징으로 하는 전지.
- 제78항에 있어서,상기 적층수 균일구간의 중첩 레이어 수는 10 이상인 것을 특징으로 하는 전지.
- 제79항에 있어서,상기 제1 탭 결합부는,상기 절곡면에 용접되고, 상기 탭 결합부의 용접 영역은 상기 전극 조립체의 반경 방향을 따라 상기 적층수 균일구간과 적어도 50% 이상 중첩되는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 무지부와 상기 제1 탭 결합부는,상기 전극 조립체의 반경 방향을 따라 용접에 의해 결합되는 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 제1 탭 결합부는,상기 전지 하우징의 하면과 평행한 상태로 상기 제1 무지부에 용접 결합되는 것을 특징으로 하는 전지.
- 제81항에 있어서,상기 제1 무지부와 상기 제1 탭 결합부 사이에 형성되는 용접 비드는,상기 전극 조립체의 반경 방향을 따라 연장된 직선 형상의 용접 패턴을 형성하는 것을 특징으로 하는 전지.
- 제81항에 있어서,상기 제1 무지부와 상기 제1 탭 결합부 사이에 형성되는 용접 비드는, 용접 패턴을 형성하고,상기 용접 패턴은, 점 용접이 연결된 선 형태를 갖는 것을 특징으로 하는 전지.
- 제81항에 있어서,상기 제1 무지부와 상기 제1 탭 결합부 사이에 형성되는 용접 비드의 폭은,0.1 mm 이상인 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 제1 탭 결합부 및 상기 제1 하우징 결합부는 각각 복수 개 구비되고,복수의 상기 제1 탭 결합부 및 제1 하우징 결합부는, 상기 제1 집전체의 중심부를 기준으로 방사형, 십자형 또는 이들이 조합된 형태로 배치되어 있는 것을 특징으로 하는 전지.
- 제86항에 있어서,복수의 상기 제1 하우징 결합부는 각각 서로 인접하는 제1 탭 결합부 사이에 배치되는 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 하우징 결합부가 복수 개 구비되고,복수의 상기 제1 하우징 결합부 각각의 제1 접촉부는, 상호 연결되어 일체로 형성된 것을 특징으로 하는 전지.
- 제5항에 있어서,상기 제1 연결부의 최 외측 지점은,상기 비딩부의 최 내측 지점과 소정 간격 이격되어 있는 것을 특징으로 하는 전지.
- 제32항에 있어서,상기 제1 밴딩부에 의해,상기 제1 접촉부와 상기 제1 연결부 사이의 각도가 예각이 되는 것을 특징으로 하는 전지.
- 제4항에 있어서,상기 주액 홀은,복수 개가 구비되는 것을 특징으로 하는 전지.
- 제91항에 있어서,복수의 상기 주액 홀은,상기 제1 탭 결합부의 폭 방향 중심부를 기준으로 좌우 대칭되도록 배치되는 것을 특징으로 하는 전지.
- 제92항에 있어서,좌우 대칭되도록 배치된 주액 홀 사이에는 상기 제1 탭 결합부와 상기 제1 무지부의 결합을 위한 용접 비드가 형성되는 것을 특징으로 하는 전지.
- 제4항에 있어서,상기 제1 탭 결합부는,상기 제1 탭 결합부와 상기 지지부의 연결 부위에서의 폭보다 상기 연결 부위로부터 상기 제1 탭 결합부의 길이 방향 단부를 향해 소정 거리 이격된 위치에서의 폭이 더 크게 형성되는 것을 특징으로 하는 전지.
- 제94항에 있어서,상기 주액 홀은,상기 연결 부위로부터 상기 제1 탭 결합부의 길이 방향 단부를 향해 소정 거리 이격된 위치에 형성되는 것을 특징으로 하는 전지.
- 제95항에 있어서,상기 주액 홀이 형성된 영역 중 적어도 일부는,상기 제1 탭 결합부와 상기 지지부의 연결 부위에서의 폭과 비교하여 상기 연결 부위로부터 상기 제1 탭 결합부의 단부를 향해 소정 거리 이격된 위치에서의 폭이 증가됨으로써 늘어난 영역에 포함되는 것을 특징으로 하는 전지.
- 제4항에 있어서,상기 제1 탭 결합부의 길이 방향 단부는,상기 전지 하우징의 내주 면과 대응되는 호 형태를 갖는 것을 특징으로 하는 전지.
- 제83항에 있어서,상기 제1 무지부와 상기 제1 탭 결합부 사이에 형성되는 용접 패턴의 연장 방향과 상기 비딩부와 상기 제1 접촉부 사이에 형성되는 용접 패턴의 연장 방향은 서로 수직인 것을 특징으로 하는 전지.
- 제63항에 있어서,상기 비딩부의 최 내측 지점은,상기 클림핑부의 말단 지점보다 반경 방향으로 더 내측에 위치하는 것을 특징으로 하는 전지.
- 제65항에 있어서,상기 실링 가스켓은 상기 하우징 커버를 감싸며,상기 실링 가스켓의 부위 중에서 상기 하우징 커버의 하면을 커버하는 부위의 반경 방향 길이는, 상기 실링 가스켓의 부위 중에서 상기 하우징 커버의 상면을 커버하는 부위의 반경 방향 길이보다 작은 것을 특징으로 하는 전지.
- 제76항에 있어서,상기 제1 탭 결합부의 반경 방향 총 길이를 T라고 하고,상기 전극 조립체의 외경을 JR이라고 하고,상기 전극 조립체의 최외곽에 배치된 분절편의 높이를 F라고 했을 때,JR - 2*F ≤ T < JR를 만족하는 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 전극 조립체의 외경을 지름으로 하는 원의 면적 대비 상기 제1 집전체가 상기 전극 조립체의 상면과 접촉하지 않는 면적의 비율은,30% 이상 100 % 미만인 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 전극 조립체의 외경을 지름으로 하는 원의 면적 대비 상기 제1 집전체가 상기 전극 조립체와 접촉하지 않는 면적의 비율은,60% 이상 100 % 미만인 것을 특징으로 하는 전지.
- 제41항에 있어서,상기 집전체 홀의 직경은,상기 전극 조립체의 코어에 구비된 권취 홀의 직경보다 작은 것을 특징으로 하는 전지.
- 제104항에 있어서,상기 권취 홀의 직경을 R3 이라고 할 때,상기 집전체 홀의 직경은 0.5*R3 이상 R3 미만인 것을 특징으로 하는 전지.
- 제104항에 있어서,상기 권취 홀의 직경을 R3라고 할 때,상기 집전체 홀의 직경은 0.7*R3 이상 R3 미만인 것을 특징으로 하는 전지.
- 제1항에 있어서,상기 전지의 직경을 높이로 나눈 폼 팩터의 비가 0.4 보다 큰 것을 특징으로 하는 전지.
- 제1항에 있어서,양극과 음극 사이에서 측정된 저항이 4miliohm 이하인 것을 특징으로 하는 전지.
- 제1 전극 및 제2 전극과 이들 사이에 개재된 분리막이 권취 축을 중심으로 권취되어 코어와 외주면을 정의한 전극 조립체로서, 상기 제1 전극은 권취 방향을 따라 활물질층이 코팅되어 있지 않은 제1 무지부를 포함하는 전극 조립체;일 측에 개방부를 구비하고 상기 개방부를 통해 상기 전극 조립체를 수용하는 전지 하우징; 및상기 제1 무지부 및 상기 전지 하우징의 내면과 전기적으로 결합하는 집전체;을 포함하고,상기 집전체는 상기 전지 하우징의 내면과 접하는 제1 부분과 상기 제1무지부와 결합된 제2 부분을 포함하고,상기 제1 부분의 중앙 영역을 상기 제2 부분이 존재하는 평면으로 투영하였을 때 상기 제1 부분의 중앙영역과 상기 제2 부분은 상기 전극 조립체의 원주 방향을 따라 이격되어 있는 것을 특징으로 하는 전지.
- 제109항에 있어서,상기 전지 하우징의 개방부와 상기 집전체 사이에 개재된 실링 가스켓을 더 포함하고,상기 제1 부분은, 상기 전지 하우징의 내면과 상기 실링 가스켓 사이에 개재되어 있는 것을 특징으로 하는 전지.
- 제109항에 있어서,상기 제1 부분과 상기 제 2부분은 상기 전극 조립체의 권취 축 방향에서 다른 평면 상에 위치하는 것을 특징으로 하는 전지.
- 전지에 적용되는 전극 조립체와 전지 하우징 사이를 전기적으로 연결시키는 집전체로서,상기 전극 조립체의 상부에 배치되는 지지부;상기 지지부로부터 연장되어 상기 전극 조립체의 제1 무지부와 결합되는 복수의 탭 결합부; 및상기 지지부로부터 연장되어 상기 전지 하우징과 전기적으로 결합되는 제1 하우징 결합부;를 포함하는 집전체.
- 제112항에 있어서,상기 탭 결합부와 상기 제1 하우징 결합부는 직접 연결되지 않고, 상기 지지부를 통해 간접적으로 연결되는 것을 특징으로 하는 집전체.
- 제112항에 있어서,상기 탭 결합부는,적어도 하나의 주액 홀을 구비하는 것을 특징으로 하는 집전체.
- 제112항에 있어서,상기 제1 하우징 결합부는,상기 전지 하우징의 내측 면 상에 결합되는 제1 접촉부; 및상기 지지부와 상기 제1 접촉부 사이를 연결하는 제1 연결부;를 포함하는 것을 특징으로 하는 집전체.
- 제115항에 있어서,상기 제1 연결부는,연장 방향이 적어도 1회 전환되는 제1 밴딩부를 적어도 하나 구비하는 것을 특징으로 하는 집전체.
- 제112항에 있어서,상기 집전체는,그 중심부에 형성되는 집전체 홀을 구비하는 것을 특징으로 하는 집전체.
- 제112항에 있어서,상기 집전체는,상기 복수의 탭 결합부 중 하나의 단부로부터 연장되어 상기 전지 하우징의 내측 면 상에 결합되는 제2 하우징 결합부;를 더 포함하는 것을 특징으로 하는 집전체.
- 제118항에 있어서,상기 제2 하우징 결합부는,상기 전지 하우징의 내측 면 상에 결합되는 제2 접촉부; 및상기 복수의 탭 결합부 중 하나의 단부와 상기 제2 접촉부 사이를 연결하는 제2 연결부;를 포함하는 것을 특징으로 하는 집전체.
- 제115항에 있어서,상기 제1 하우징 결합부가 복수 개 구비되고,복수의 상기 제1 하우징 결합부 각각의 제1 접촉부는, 상호 연결되어 일체로 형성된 것을 특징으로 하는 집전체.
- 제116항에 있어서,상기 제1 밴딩부에 의해,상기 제1 접촉부와 상기 제1 연결부 사이의 각도가 예각이 되는 것을 특징으로 하는 집전체.
- 제114항에 있어서,상기 주액 홀은,복수 개가 구비되는 것을 특징으로 하는 집전체.
- 제122항에 있어서,복수의 상기 주액 홀은,상기 탭 결합부의 폭 방향 중심부를 기준으로 좌우 대칭되도록 배치되는 것을 특징으로 하는 집전체.
- 제114항에 있어서,상기 탭 결합부는,상기 탭 결합부와 상기 지지부의 연결 부위에서의 폭보다 상기 연결 부위로부터 상기 탭 결합부의 길이 방향 단부를 향해 소정 거리 이격된 위치에서의 폭이 더 크게 형성되는 것을 특징으로 하는 집전체.
- 제124항에 있어서,상기 주액 홀은,상기 연결 부위로부터 상기 탭 결합부의 길이 방향 단부를 향해 소정 거리 이격된 위치에 형성되는 것을 특징으로 하는 집전체.
- 제125항에 있어서,상기 주액 홀이 형성된 영역 중 적어도 일부는,상기 탭 결합부와 상기 지지부의 연결 부위에서의 폭과 비교하여 상기 연결 부위로부터 상기 탭 결합부의 단부를 향해 소정 거리 이격된 위치에서의 폭이 증가됨으로써 늘어난 영역에 포함되는 것을 특징으로 하는 집전체.
- 제112항에 있어서,상기 탭 결합부의 길이 방향 단부는,상기 전지 하우징의 내주 면과 대응되는 호 형태를 갖는 것을 특징으로 하는 집전체.
- 제1항 내지 제111항 중 어느 한 항에 따른 전지를 복수 개 포함하는 배터리팩.
- 제128항에 있어서,복수의 상기 전지는 소정 수의 열로 배열되고,각 전지의 단자와 전지 하우징 바닥의 외부면은 상부를 향하도록 배치되는 것을 특징으로 하는 배터리 팩.
- 제129항에 있어서,복수의 전지를 직렬 및 병렬로 연결하는 복수의 버스바를 포함하고,각 버스바는 인접하는 전지의 상부에 배치되고,각 버스바는,인접하는 단자 사이에서 연장되는 바디부;상기 바디부의 일측으로 연장되어 상기 일측에 위치한 전지의 전극 단자에 전기적으로 결합하는 복수의 제1버스바 단자; 및상기 바디부의 타측으로 연장되어 상기 타측에 위치한 전지의 전지 하우징 바닥의 외부면에 전기적으로 결합하는 복수의 제2버스바 단자를 포함하는 것을 특징으로 하는 배터리 팩.
- 제128항에 따른 배터리 팩을 포함하는 자동차.
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PCT/KR2022/001012 WO2022158864A2 (ko) | 2021-01-19 | 2022-01-19 | 전극 단자의 고정 구조 및 이를 포함하는 배터리, 배터리 팩 및 자동차 |
PCT/KR2022/001011 WO2022158863A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리, 그리고 이를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001007 WO2022158859A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리 및 이에 적용되는 집전체, 그리고 이를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001008 WO2022158860A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리 및 이에 적용되는 집전체, 그리고 이러한 배터리를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001006 WO2022158858A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리, 그리고 이를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001009 WO2022158861A2 (ko) | 2021-01-19 | 2022-01-19 | 전지 및 이에 적용되는 집전체, 그리고 이러한 전지를 포함하는 배터리 팩 및 자동차 |
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PCT/KR2022/001012 WO2022158864A2 (ko) | 2021-01-19 | 2022-01-19 | 전극 단자의 고정 구조 및 이를 포함하는 배터리, 배터리 팩 및 자동차 |
PCT/KR2022/001011 WO2022158863A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리, 그리고 이를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001007 WO2022158859A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리 및 이에 적용되는 집전체, 그리고 이를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001008 WO2022158860A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리 및 이에 적용되는 집전체, 그리고 이러한 배터리를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001006 WO2022158858A2 (ko) | 2021-01-19 | 2022-01-19 | 배터리, 그리고 이를 포함하는 배터리 팩 및 자동차 |
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EP (16) | EP4047725B1 (ko) |
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CN (16) | CN217239510U (ko) |
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