WO2022158860A2 - 배터리 및 이에 적용되는 집전체, 그리고 이러한 배터리를 포함하는 배터리 팩 및 자동차 - Google Patents
배터리 및 이에 적용되는 집전체, 그리고 이러한 배터리를 포함하는 배터리 팩 및 자동차 Download PDFInfo
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- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a battery and a current collector applied thereto, and a battery pack and a vehicle including the battery.
- 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.
- the electrode assembly in order to reduce the self-resistance of the electrode assembly, it is necessary to develop a new electrode assembly structure and a current collector structure suitable for the structure of the electrode assembly.
- the application of the electrode assembly and the current collector of such a novel structure is more necessary for a device requiring a battery pack having high output/high capacity, such as, for example, an electric vehicle.
- the form factor of batteries is increasing. That is, the diameter and height of the battery are increasing compared to the conventional batteries having a form factor such as 1865 or 2170.
- An increase in the form factor leads to an increase in energy density, increased safety against thermal runaway, and improved cooling efficiency.
- the energy density of a battery can be further increased when the unnecessary space inside the battery housing is minimized with an increase in the form factor. 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-described 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 between the current collector and a coupling portion of 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, thereby improving productivity, and a battery including the same in manufacturing a battery The purpose.
- a battery according to an embodiment of the present invention for solving the above problems is an electrode assembly defining a core and an outer circumferential surface by winding a first electrode and a second electrode and a separator interposed therebetween around a winding axis, an electrode assembly in which the first electrode includes an active material portion coated with an active material layer along a winding direction and a first uncoated portion not coated with an active material layer, wherein at least a portion of the first uncoated portion is itself used as an electrode tab;
- a battery housing accommodating the electrode assembly through an opening formed on one side;
- a current collector including a tab coupling part coupled to the first uncoated part and a housing coupling part extending from the tab coupling part and electrically coupled to an inner surface of the battery housing;
- a cap covering the opening includes
- the battery housing may include a beading portion formed at an end adjacent to the opening portion and press-fitted toward the inside.
- the battery housing may include a crimping portion formed on a side facing the opening portion rather than the beading portion and extending and bent toward the opening portion.
- the housing coupling part may be press-fixed by the crimping part.
- connection part may have a structure convex upward based on an imaginary straight line connecting one end of the contact part and one end of the tab coupling part.
- connection part may have a structure raised upward than the beading part after the sizing process.
- connection part may include at least one bent part.
- the bent portion may be located above a virtual plane parallel to the bottom surface of the battery housing passing through the center of an imaginary straight line connecting one end of the contact portion and one end of the tab coupling portion.
- the at least one bent portion 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 between the contact portion and the connection portion may be bent at an obtuse angle.
- the connecting portion as the connecting portion toward the beading portion, the inclination may be reduced stepwise or gradually.
- an angle between the tab coupling part and the connection part may be between 0 and 90 degrees.
- connection part may support the cap.
- the tab coupling portion and the contact portion may be positioned at the same height.
- the contact portion may have a flat surface coupled to an upper surface of the beading portion facing the opening portion.
- the at least one tab coupling part of the current collector may be located further below the lower surface of the beading part.
- At least one of the upper surface of the beading part and the lower surface of the beading part may be inclined at a predetermined angle with the lower surface of the battery housing.
- the contact part may be seated on the inclined upper surface of the beading part.
- At least one of the upper surface of the beading part and the lower surface of the beading part may be parallel to the lower surface of the battery housing in at least some regions.
- the upper surface of the beading part and the lower surface of the beading part may be asymmetric with respect to a virtual reference plane passing through the innermost point of the beading part in parallel with the bottom surface of the battery housing.
- the contact part may be seated on a flat upper surface of the beading part.
- the indentation depth of the beading part is called PD
- the minimum value of the radius of curvature of the beading part is R 1,min
- the minimum value of the weld bead width is W bead,min
- the beading part is R 2,min .
- the press-fitting depth of the beading portion may be 0.2 to 10 mm.
- the indentation depth of the beading portion is referred to as PD
- the maximum value of the indentation depth is referred to as PDmax
- the shortest distance from the end of the contact portion to the vertical line passing the innermost point of the beading portion Overlap Let the length be OV, let the minimum value of the radius of curvature of the beading part be R 1,min , and let the minimum value of the weld bead width be W bead,min , in the boundary region between the beading part and the inner side of the battery housing.
- the minimum value of the radius of curvature is R 2,min , the following relational expression may be satisfied.
- the contact portion may be welded on the beading portion.
- the contact portion may be welded on a flat upper surface of the beading portion.
- a welding area between the contact part and the beading part may be formed to be narrower than a flat upper surface of the beading part.
- the indentation depth of the beading portion is referred to as PD
- the maximum value of the indentation depth is referred to as PDmax
- the distance to the point be W
- the overlap length which is the shortest distance from the end of the contact part to the vertical line passing the innermost point of the beading part
- the minimum value of OV is OV min
- the maximum value of OV is OV max
- the weld bead formed between the beading part and the contact part may form a linear welding pattern extending in a circumferential direction.
- At least one welding bead formed between the beading portion and the contacting portion, 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 portion and the contact portion 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 contacting part may be formed in the same contacting part.
- the width of the weld bead formed between the beading portion and the contact portion may be 0.1 mm or more.
- the first uncoated portion and the tab coupling portion may be welded to each other in a radial direction of the electrode assembly.
- the tab coupling part may be welded to the first uncoated part in a state parallel to the lower surface of the battery housing.
- the plurality of welding beads formed between the first uncoated portion and the tab coupling portion may form a linear welding pattern extending along a radial direction of the electrode assembly.
- a welding bead formed between the first uncoated region and the tab coupling portion may form a welding pattern, and the welding pattern may have a line shape in which point welding is connected.
- the width of the weld bead formed between the first uncoated portion and the tab coupling portion may be 0.1 mm or more.
- 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.
- the plurality of segment pieces may be bent along a radial direction of the electrode assembly to form a curved surface.
- the plurality of segment pieces may be overlapped in multiple layers along a radial direction of the electrode assembly to form a curved surface.
- the bent surface has a layered number increasing section in which the number of overlapping layers of the segment sequentially increases to a maximum value from the outer periphery side to the core side of the singi electrode assembly, and the innermost segment from the radius point at which the number of overlapping layers becomes the maximum value. It may include a section with a uniform number of stacks up to the radius point.
- the 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 tab coupling part may be welded to the bent surface, and a welding area of the tab coupling part may overlap the uniform number of stacking sections in a radial direction of the electrode assembly by at least 50% or more.
- the current collector may include a circular current collector hole in the center of the current collector.
- the diameter of the current collector hole may be greater than or equal to the diameter of the winding center hole provided in the core of the electrode assembly.
- the battery may include a sealing gasket provided between the battery housing and the cap.
- the contact portion may be interposed between the sealing gasket and the beading portion.
- the thickness of the sealing gasket may vary along the circumferential direction.
- the thickness of the sealing gasket may alternately repeat an increase and a decrease in the circumferential direction.
- the sealing gasket may have the same compressibility in a region in contact with the contact portion and in a region not in contact with the contact portion.
- the sealing gasket may have a smaller compressibility in a region not in contact with the contact portion than in a region in contact with the contact portion.
- the sealing gasket may have a greater thickness in a region not in contact with the contact portion than in a region in contact with the contact portion.
- the current collector may have a leg structure extending in a radial direction while the tab coupling part and the housing coupling part are connected to each other.
- the leg structure may be provided in plurality.
- the leg structure may be disposed in a radial shape, a cross shape, or a combination thereof based on the central portion of the current collector.
- a plurality of the housing coupling parts may be provided, and the plurality of the housing coupling parts may be interconnected and integrally formed.
- connection part may include at least one bending part whose extension direction is switched at least once.
- the protruding outermost point of the bending part may be spaced apart from the innermost point of the beading part by a predetermined distance.
- the angle between the contact portion and the connection portion may be an acute angle by the bending portion.
- connection part may be elastically biased upward by the bending part.
- a circumferential length of the contact portion may be the same as a circumferential length of the tab coupling portion.
- a circumferential length of the contact portion may be the same as a circumferential length of the connecting portion.
- a circumferential length of the contact portion may be relatively longer than a circumferential length of the tab coupling portion.
- a circumferential length of the contact portion may be relatively longer than a circumferential length of the connecting portion.
- the contact portion may have an arc shape extending in a circumferential direction along the beading portion of the battery housing.
- the contact portion may have an arc shape extending in opposite directions along a circumferential direction from an intersection point of the connection portion and the contact portion.
- the sum of the lengths of the contact portions extending in the circumferential direction may correspond to the length of the inner periphery of the battery housing.
- the connecting portion may have an arc shape extending in a circumferential direction along the contact portion.
- a boundary region between the tab coupling part and the housing coupling part may be bent such that an end of the housing coupling part faces the beading part.
- connection portion between the contact portion and the connection portion may be bent.
- connection portion between the contact portion and the connection portion may have a complementary shape corresponding to the inner surface of the beading portion.
- connection portion between the contact portion and the connection portion may be seamlessly coupled to the beading portion while having a shape matching the inner surface of the beading portion.
- the boundary region of the tab coupling portion and the housing coupling portion may be located more inside than the innermost point of the beading portion formed in the battery housing.
- the tab coupling portion when viewed along a longitudinal axis of the battery housing, may not overlap by the beading portion.
- the second electrode in the battery, includes a second uncoated region exposed to the outside of the separator without an active material layer being coated on the long side end, and at least a portion of the second uncoated region itself a terminal used as an electrode tab as an electrode tab, provided on the opposite side of the open part, and electrically connected to the second uncoated part.
- the battery includes: a tab coupling part formed between the second uncoated part and the terminal and coupled to the second uncoated part; and a second current collector having a; and a terminal coupling unit coupled to the terminal.
- the terminal coupling part may cover a winding center hole of the electrode assembly.
- the longest radius from the center of the terminal coupling part of the second current collector to the end of the tab coupling part may be greater than the longest radius from the center of the current collector to the end of the tab coupling part.
- the tab coupling portion of the second current collector may be coupled to the bent end of the second uncoated portion.
- a welding area for coupling the tab coupling portion of the second current collector and the bent end of the second uncoated portion is further formed, and a distance from the center of the terminal coupling portion of the second current collector to the welding area is , may be the same as the distance from the center of the current collector to the welding area on the tab coupling portion, or may have a distance deviation of 5% or less.
- the welding region of the second current collector may have a longer length than the welding region on the tab coupling portion of the current collector.
- one or more holes for injecting an electrolyte may be formed on the tab coupling part.
- the ratio of the form factor divided by the diameter of the battery by the height may be greater than 0.4.
- the measured resistance between the anode and the cathode may be 4 milliohms or less.
- 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.
- the plurality of 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 includes a plurality of bus bars for connecting a plurality of batteries in series and in parallel, each bus bar is disposed between terminals of adjacent batteries, and each bus bar is a body portion extending between the terminals; 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.
- the current collector according to an embodiment of the present invention, at least one tab coupling portion coupled to the first uncoated portion of the electrode assembly; and at least one housing coupling part extending from the tab coupling part and electrically coupled to the beading part of the battery housing.
- the battery according to another embodiment of the present invention is an electrode assembly having a structure in which first and second electrodes having a sheet shape and a separator interposed therebetween are wound in one direction, wherein the first electrode has a long side.
- an electrode assembly including a first uncoated region on which an active material layer is not coated and exposed to the outside of the separator, wherein at least a portion of the first uncoated region is itself used as an electrode tab; a battery housing accommodating the electrode assembly through an opening formed on one side; a current collector electrically coupled to the first uncoated region and an inner surface of the battery housing; and a sealing gasket interposed between the opening of the battery housing and the current collector, wherein a portion of the current collector in contact with an inner surface of the battery housing is interposed between the inner surface of the battery housing and the sealing gasket.
- the battery housing may include a beading portion formed at an end adjacent to the opening portion and press-fitted toward the inside.
- an extension direction of a welding pattern formed between the first uncoated portion and the tab coupling portion and an extension direction of a welding pattern formed between the beading portion and the contact portion may be perpendicular to each other.
- the innermost point of the beading portion, than the distal point of the crimping portion may be located more inward in the radial direction.
- the sealing gasket surrounds the cap, and the radial length of a portion of the sealing gasket that covers the lower surface of the cap is a portion of the sealing gasket that covers the upper surface of the cap. may be smaller than the radial length of
- 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 maximum value of the beading part when the overlap length is OV.
- the beading portion may have 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 current collector may be OV - R1 .
- the radial width length of the welding pattern formed between the beading part and the 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%.
- a ratio of an area in which the 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 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 center 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.
- the connecting portion may extend in a radial direction and a winding axial direction.
- the tab coupling portion, the connecting portion, and the contact portion may have the same width along the extension direction.
- the contact portion may have a greater width than the connection portion.
- the connecting portion may have a smaller width than the tab coupling portion.
- connection part may have a greater width than the tab coupling part.
- resistance can be greatly reduced in electrically connecting the electrode assembly and the battery housing.
- FIG. 1A is a diagram illustrating a part of a longitudinal cross-sectional view of a battery according to an embodiment of the present invention.
- 1B is a view showing a part of a longitudinal cross-sectional view of a battery according to another embodiment of the present invention.
- FIG. 1C is an enlarged view of an upper portion of the electrode assembly of FIG. 1B .
- FIG. 1D is an enlarged view of an upper portion of the first uncoated region of FIG. 1C .
- FIG. 2 is a view showing a part of a longitudinal cross-sectional view of a battery according to another embodiment of the present invention.
- FIG. 3 is a view showing a part of a longitudinal cross-sectional view of a battery according to another embodiment of the present invention.
- FIG. 4A is a view for explaining a current collector included in the battery of FIG. 3 .
- FIG. 4B is a view for explaining an embodiment in which a bending part is omitted from the current collector of FIG. 4A .
- FIG. 5 is a view for explaining a current collector according to another embodiment of the present invention.
- FIG. 6 is a view for explaining a current collector according to another embodiment of the present invention.
- FIG. 7 is a view for explaining the relationship between the current collector hole and the winding hole.
- FIG. 8A is a view for explaining a welding area between the current collector and the first uncoated portion and a welding area between the current collector and the beading portion of FIG. 4A .
- FIG. 8B is a view for explaining a welding area between the current collector and the first uncoated portion and a welding area between the current collector and the beading portion of FIG. 4B .
- FIG. 9 is a view for explaining a welding area between the current collector and the first uncoated portion and a welding area between the current collector and the beading portion of FIG. 5 .
- FIG. 10 is a view for explaining a welding area between the current collector and the first uncoated portion and a welding area between the current collector and the beading portion of FIG. 6 .
- 11 is a view for explaining the position, length and width of the weld bead formed in the welding area between the contact part and the beading part.
- FIG. 12 is a view for explaining the relationship between the diameter of the inner surface of the battery housing and the total diameter of the current collector.
- 13A is a view for explaining a welding process of the current collector.
- 13B is a view for explaining a beading process of the battery housing.
- 13C is a view for explaining a crimping process of the battery housing.
- 13D is a view for explaining a sizing process of the battery housing.
- 13E is a view for explaining a change in the current collector after the sizing process according to the shape of the current collector before the sizing process.
- 13F is a view for explaining a shape of a current collector in which a welding area can be maintained even after a sizing process.
- 13G is a view for explaining a shape of a current collector in which a welding area can be maintained even after a sizing process.
- FIG. 14 is a plan view illustrating an electrode plate structure according to a preferred embodiment of the present invention.
- 15 is a cross-sectional view taken along the longitudinal direction (Y) of an electrode assembly in which an uncoated segmental structure of an electrode plate according to an embodiment of the present invention is applied to a first electrode plate and a second electrode plate.
- 16A is a cross-sectional view taken along the longitudinal direction (Y) of the electrode assembly in which the uncoated region is bent according to an embodiment of the present invention.
- 16B is a perspective view of an electrode assembly in which an uncoated region is bent according to an embodiment of the present invention.
- 17 is a top plan view illustrating a state in which a plurality of batteries are connected in series and in parallel using a bus bar according to an embodiment of the present invention.
- 18A is a view for explaining a second current collector according to an embodiment of the present invention.
- 18B is a view for explaining a second current collector according to another embodiment of the present invention.
- 19 is a view for explaining a battery pack including a battery according to an embodiment of the present invention.
- FIG. 20 is a view for explaining a vehicle including the battery pack of FIG. 19 .
- 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 wound shape is referred to as an axial direction (Y).
- the direction surrounding the winding shaft is referred to as a circumferential direction or a circumferential direction (X).
- a direction close to or away from the take-up shaft is referred to as a radial direction.
- a direction closer to the take-up shaft is referred to as a centripetal direction
- a direction away from the take-up shaft is referred to as a centrifugal direction.
- a battery 1 includes an electrode assembly 10 , a battery housing 20 , a current collector (a first current collector) 30 , and a cap 40 .
- the battery 1 is, in addition, a terminal 50 and/or a sealing gasket G1 and/or an insulating gasket G2 and/or a current collector (second current collector) P and/or an insulator S) may further include.
- the terminal 50 may be provided on the opposite side of the open part and may be electrically connected to the second uncoated part 12 .
- the electrode assembly 10 includes a first uncoated area 11 and a second uncoated area 12 . More specifically, the electrode assembly 10 may be manufactured by winding a laminate formed by sequentially stacking a first electrode, a separator, a second electrode, and a separator at least once. That is, the electrode assembly 10 applied to the present invention may be a wound type electrode assembly. In this case, an additional separator may be provided on the outer circumferential surface of the electrode assembly 10 to insulate it from the battery housing 20 .
- the electrode assembly 10 may have a winding structure well known in the related art without limitation.
- the electrode assembly 10 may be an electrode assembly 10 in which a core and an outer circumferential surface are defined by first and second electrodes and a separator interposed therebetween being wound around a winding axis.
- the first electrode may include an active material portion coated with an active material layer and a first uncoated portion 11 on which an active material layer is not coated along a winding direction.
- the electrode assembly 10 may be a winding type electrode assembly having a structure in which the first and second electrodes having a sheet shape and a separator interposed therebetween are wound in one direction.
- the first electrode may include a first uncoated portion 11 that is not coated with an active material layer on a long side end and is exposed to the outside of the separator.
- the second electrode may include a second uncoated region 12 that is not coated with an active material layer on the long side end and is exposed to the outside of the separator. At least a portion of the first uncoated region 11 may be used as an electrode tab by itself. At least a portion of the second uncoated region 12 may be used as an electrode tab by itself.
- 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 current collector in the width direction (in a direction parallel to the height direction of the battery 1 shown in FIG. 1A ).
- the uncoated region functions as a first electrode tab.
- the first uncoated region 11 is provided above the electrode assembly 10 accommodated in the battery housing 20 in the height direction (in a direction parallel to the height direction of the battery 1 shown in FIG. 1A ).
- the first uncoated region 11 may be, for example, a negative electrode tab.
- 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 current collector in the width direction (in a direction parallel to the height direction of the battery 1 shown in FIG. 1A ).
- the uncoated region functions as a second electrode tab.
- the second uncoated region 12 is provided at a lower portion in the height direction of the electrode assembly 10 accommodated in the battery housing 20 .
- the second uncoated region 12 may be, for example, a positive electrode tab.
- the positive active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate may be used without limitation as long as the active material is known in the art.
- the positive active material has the general formula A[A x M y ]O 2+z (A includes at least one element of Li, Na, and K; M is Ni, Co, Mn, Ca, Mg, Al, at least one element selected from Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; x ⁇ 0, 1 ⁇ x+y ⁇ 2, - 0.1 ⁇ z ⁇ 2; stoichiometric coefficients x, y and z are selected such that the compound remains electrically neutral).
- the positive active material includes an alkali metal compound xLiM 1 O 2 (1x)Li 2 M 2 O 3 (M 1 comprising at least one element having an average oxidation state 3; M; 2 includes at least one element having an average oxidation state 4; 0 ⁇ x ⁇ 1).
- the positive active material may have the general formula Li a M 1 x Fe 1x M 2 y P 1y M 3 z O 4z (M 1 is Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, At least one element selected from Nd, Al, Mg and Al M 2 is Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, As, Sb, Si , Ge, contains at least one element selected from V and S; M 3 contains a halogen element optionally including F; 0 ⁇ a ⁇ 2, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1; stoichiometric coefficients a, x, y and z are chosen such that the compound remains electrically neutral), or Li 3 M 2 (PO 4 ) 3 [M is Ti, Si, Mn, Fe, Co, V, Cr , Mo, Ni, Al, including at least one element selected from Mg
- the positive electrode active material may include primary particles and/or secondary particles in which the primary particles are aggregated.
- the negative active material may be a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound.
- a metal oxide having a potential of less than 2V, such as TiO 2 and SnO 2 may also be used as the negative electrode active material.
- As the carbon material both low-crystalline carbon, high-crystalline carbon, and the like may be used.
- the separator is a porous polymer film, for example, a porous polymer film made of a polyolefin-based polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, or an ethylene/methacrylate copolymer. Or they can be used by laminating them.
- the separator may be a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, or the like.
- At least one surface of the separator may include a coating layer of inorganic particles. It is also possible that the separation membrane itself is made of a coating layer of inorganic particles. Particles constituting the coating layer may have a structure combined with a binder so that an interstitial volume exists between adjacent particles.
- the inorganic particles may be formed of an inorganic material having a dielectric constant of 5 or more.
- the inorganic particles are Pb(Zr,Ti)O 3 (PZT), Pb 1x La x Zr 1y Ti y O 3 (PLZT), PB(Mg 3 Nb 2/3 )O 3 PbTiO 3 ( PMNPT), BaTiO 3 , hafnia(HfO 2 ), SrTiO 3 , TiO 2 , Al 2 O 3 , ZrO 2 , SnO 2 , CeO 2 , MgO, CaO, ZnO and Y 2 O 3 At least one selected from the group consisting of material may be included.
- the electrolyte may be a salt having a structure such as A + B -- .
- a + includes an ion composed of an alkali metal cation such as Li + , Na + , K + or a combination thereof.
- B -- is F -- , Cl -- , Br -- , I -- , NO 3 -- , N(CN) 2 -- , BF 4 -- , ClO 4 -- , AlO 4 -- , AlCl 4 -- , PF 6 -- , SbF 6 -- , AsF 6 -- , BF 2 C 2 O 4 -- , BC 4 O 8 -- , (CF 3 ) 2 PF 4 -- , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 -- , (CF 3 ) 5 PF -- , (CF 3 ) 6 P -- , CF 3 SO 3 -- , C 4 F 9 SO 3 -- , CF 3 CF 2 SO 3 -- , (CF 3 SO 2 ) 2 N -- , (F
- the electrolyte can also be used by dissolving it in an organic solvent.
- organic solvent propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC) , dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (N-methyl- 2-pyrrolidone, NMP), ethyl methyl carbonate (EMC), gamma butyrolactone ( ⁇ -butyrolactone), or a mixture thereof may be used.
- PC propylene carbonate
- EC ethylene carbonate
- DEC diethyl carbonate
- DMC dimethyl carbonate
- DPC dipropyl carbonate
- dimethyl sulfoxide acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofur
- the battery housing 20 is a substantially cylindrical container having an opening formed on one side, 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. 1A ) positioned opposite to the opening part are generally formed integrally. That is, the battery housing 20 generally has an open upper end in the height direction, and a lower end has a closed region except for the central portion.
- 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 thereof in the height direction.
- 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 the open portion and press-fitted inwardly.
- the battery housing 20 may include a crimping portion 22 that is formed on a side facing the open portion rather than the beading portion 21 and is extended and bent toward the open portion.
- the battery housing 20 may include a beading portion 21 formed at an upper end thereof.
- the battery housing 20 may further include a crimping portion 22 formed higher than the beading portion 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.
- 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 provides a support surface on which the cap 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, on the upper surface of the beading portion 21, at least a portion of the periphery of the current collector 30 of the present invention and/or the periphery of the periphery of the cap 40 of the present invention may be seated.
- the upper surface of the beading part 21 is at least A portion may extend along a direction substantially parallel to the lower surface of the battery housing 20 , that is, along a direction substantially perpendicular to the sidewall of the battery housing 20 .
- the beading unit 21 the upper surface of the beading unit 21, which is press-fitted and located above the innermost point; and a lower surface of the beading part 21 located below the innermost point of the press-fitted innermost point.
- the press-fitting depth PD of the beading part 21 may be 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 welding bead width W bead , and the inner side of the beading part 21 and the battery housing 20.
- the radius of curvature (R2) in the boundary region of For example, referring to FIG. 11 , in order to enable welding, 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 side 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 R 1,min and R 2,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-fitting depth PD of the beading portion 21 may vary depending on the material and thickness of the battery housing 20 .
- the maximum value of the press-fitting depth PD of the beading part 21 may be about 10 mm. have. Accordingly, in one example, the press-fitting depth PD of the beading portion 21 may have a value of approximately 0.2 to 10 mm.
- At least one of the upper surface of the beading part 21 and the lower surface of the beading part 21 forms an inclined shape with the lower surface of the battery housing 20 at a predetermined angle.
- at least one of the upper surface of the beading part 21 and the lower surface of the beading part 21 may include a section parallel to the lower surface of the battery housing 20 in at least some areas.
- the upper surface of the beading part 21 and the lower surface of the beading part 21 may include at least a part of a flat section (F of FIG. 3 ).
- the crimping part 22 is formed on the beading part 21 .
- the crimping part 22 has a shape extending and bending to surround the edge of the cap 40 disposed on the beading part 21 .
- the cap 40 is fixed on the beading portion 21 .
- the innermost point of the beading part 21 may be located more inward in the radial direction than the distal point of the crimping part 22 .
- 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 the flat beading portion 21 even after the sizing process. If, for example, the innermost point of the beading part 21 is located further 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 beaded.
- the area of the upper surface of the crimping part 22, which is an area subjected to pressure in the sizing process, is widened, and accordingly, the beading part 21 may not be flat after the sizing process. Therefore, in the present invention, it is preferable that the innermost point of the beading portion 21 is located further in the radial direction than the end of the crimping portion 22 .
- 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 also the battery housing 20 . is electrically connected to That is, the current collector 30 electrically connects the electrode assembly 10 and the battery housing 20 .
- the current collector 30 may be electrically coupled to the first uncoated portion 11 and the beading portion 21 of the battery housing 20 .
- At least one tab coupling portion 32 of the current collector 30 may be located further below the lower surface of the beading portion 21 .
- the current collector 30 includes a tab coupling part 32 coupled to the first uncoated part 11 and a beading part 21 on the inner surface of the battery housing 20 extending from the tab coupling part 32 . and a housing coupling part 33 electrically coupled thereto.
- a boundary region between the tab coupling part 32 and the housing coupling part 33 may be bent such that an end of the housing coupling part 33 faces the beading part 21 . That is, referring to FIG. 2 and the like, the boundary area between the tab coupling part 32 and the housing coupling part 33 may have a shape bent upward. Meanwhile, the housing coupling part 33 may be press-fixed by the crimping part 22 .
- the current collector 30 may further include a central portion 31 in a core region of the current collector 30 .
- the central portion 31 may have a substantially circular shape.
- the central portion 31 may be a loop-shaped portion forming a loop shape surrounding the winding axis of the electrode assembly 10 .
- the loop-shaped portion may have one or two or more cut-out portions along the circumferential direction.
- the central portion 31 may be selectively coupled to the first uncoated region 11 .
- the current collector 30 may further include a cover portion extending from the loop-shaped portion and disposed to surround a partial region of the first uncoated portion 11 .
- a contact area between the first uncoated region 11 and the current collector 30 may increase by the cover portion. Accordingly, the internal resistance of the battery may be further reduced.
- the current collector 30 may have at least one leg structure extending in a radial direction in a state in which the tab coupling part 32 and the housing coupling part 33 are interconnected.
- the leg structure may be provided in plurality.
- the current collector 30 may have a four-leg structure.
- a plurality of housing coupling parts 33 may also be provided.
- the plurality of housing coupling portions 33 may be interconnected and integrally formed.
- the leg structure may be disposed in a radial shape, a cross shape, or a combination thereof based on the central portion 31 of the current collector 30 .
- the central part 31 and the at least one tab coupling part 32 are disposed on the electrode assembly 10 , and when the beading part 21 is formed in the battery housing 20 , It may be located at the bottom.
- One or more holes for injecting an electrolyte may be formed on the tab coupling part 32 .
- the total length of the tab coupling part 32 in the radial direction is T
- the outer diameter of the electrode assembly 10 is JR
- the height of the segment 11a disposed at the outermost side of the electrode assembly is F.
- the total length T in the radial direction of the tab coupling portion 32 is greater than the length obtained by subtracting the height of the outermost segment 11a from the outer diameter JR of the electrode assembly 10 twice. or may be the same
- the tab coupling portion 32 covers the end of the segment 11a disposed at the outermost portion. That is, the current collector 30 may have an outer diameter that covers the end of the segment 11a bent at the last winding turn of the first electrode. In this case, welding is possible in a state in which the fragments 11a forming the bent surface 102 coupled to the tab coupling part 32 are uniformly pressed by the current collector 30, and even after welding, the fragments 11a A tight lamination state can be well maintained.
- the tight lamination state means a state in which there is substantially no gap between the fragments as shown in FIG. 1C .
- the tight stacking state contributes to lowering the resistance of the battery 1 to a level suitable for rapid charging (eg, 0.5miliohm or more and 4miliohm or less, preferably 1.0miliohm or more and 4miliohm or less) or less.
- the total length T in the radial direction of the tab coupling part 32 may be smaller than the outer diameter JR of the electrode assembly 10 . If the total length T in the radial direction of the tab coupling part 32 is greater than the outer diameter JR of the electrode assembly 10 , the dead space inside the battery housing 20 increases and the battery 1 energy density may be adversely affected. Accordingly, the total length T in the radial direction is preferably smaller than the outer diameter JR of the electrode assembly 10 .
- the central portion 31 includes a circular current collector hole H2 formed at a position corresponding to the winding center hole H1 formed in the central portion of the electrode assembly 10 .
- the winding center 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) P, which will be described later, or the terminal 50 and the lead tab (not shown). It can function as a passage for insertion of a welding rod for welding of the liver or irradiation of a laser welding beam.
- FIG. 7 is a view for explaining the relationship between the current collector hole and the winding hole.
- the diameter of the current collector hole H2 may be greater than or equal to the diameter of the winding center hole H1 provided in the core of the electrode assembly 10 .
- the reason for setting the diameter of the current collector hole H2 to be larger than the diameter of the winding center hole H1 provided in the core of the electrode assembly 10 is that the terminal 50 and the current collector (second This is because, when inserting a welding rod for welding between the current collector) P or for welding between the terminal 50 and the lead tab (not shown), or when irradiating a laser welding beam, it is necessary to secure a space according to the insertion of the welding guide. If the diameter of the current collector hole H2 is excessively smaller than the diameter of the winding center hole H1, the winding center hole H1 may be covered and act as an interference factor during continuous resistance welding (CRW) welding.
- CCW continuous resistance welding
- the diameter of the current collector hole H2 may be smaller than the diameter of the winding center hole H1 provided in the core of the electrode assembly 10 .
- the diameter of the current collector hole H2 may be 0.5*R3 or more and less than R3, and preferably, 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 when the vent is formed.
- the separator or the uncoated portion at the winding center side is the upper surface of the electrode assembly 10 . It has the effect of preventing it from escaping.
- the diameter of the current collector hole H2 is preferably 0.5*R3 or more, and more preferably 0.7*R3 or more.
- the central portion 31 may have a substantially circular plate shape.
- the central portion 31 may have a ring-shaped plate shape in which a current collector hole H2 is provided.
- the at least one tab coupling part 32 may have a shape extending from the central part 31 of the current collector 30 toward the sidewall of the battery housing 20 approximately radially.
- the tab coupling part 32 may be provided, for example, in plurality.
- each of the plurality of tab coupling portions 32 may be positioned to be spaced apart from each other along the circumference of the central portion 31 .
- the coupling area with the first uncoated part 11 may be increased. Accordingly, the coupling force between the first uncoated portion 11 and the tab coupling portion 32 may be secured and electrical resistance may be reduced.
- the tab coupling part 32 may be welded to the first uncoated part 11 .
- the welding method for example, laser welding, resistance welding, ultrasonic welding, etc. are possible, but the welding method is not limited thereto.
- the tab coupling part 32 may be welded to the first uncoated part 11 in a state parallel to the lower surface of the battery housing 20 .
- the first uncoated portion 11 and the tab coupling portion 32 may be welded to each other in a radial direction of the electrode assembly 10 .
- FIG. 1B is a view showing a part of a longitudinal cross-sectional view of a battery according to another embodiment of the present invention.
- FIG. 1C is an enlarged view of an upper portion of the electrode assembly 10 of FIG. 1B
- FIG. 1D is an enlarged view of an upper portion of the first uncoated region 11 of FIG. 1C .
- the first uncoated region 11 may include a plurality of segment pieces 11a along the winding direction of the electrode assembly 10 .
- the plurality of segment pieces 11a may be bent along a radial direction of the electrode assembly 10 to form a curved surface 102 .
- the radial direction of the electrode assembly means a direction toward the core side or the outer circumference side. For example, as shown in FIG.
- the first uncoated region 11 may include a plurality of segment pieces 11a divided along a winding direction of the electrode assembly 10 .
- the plurality of segment pieces 11a may be bent toward the core side of the electrode assembly 10 .
- the plurality of segment pieces 11a may overlap in multiple layers along the radial direction of the electrode assembly 10 .
- the curved surface 102 has a section where the number of overlapping layers of the segment 11a sequentially increases to a maximum value from the outer periphery side of the singi electrode assembly 10 to the core side, and a radius point at which the number of overlapping layers becomes the maximum. It may include a section with a uniform number of layers up to a radius point where the innermost segment exists.
- the tab coupling part 32 may be coupled to an area in which the plurality of segment pieces 11a overlap in multiple layers.
- the tab coupling part 32 may be coupled to the curved surface so as to overlap the uniform number of layers.
- the tab coupling part 32 and the first uncoated part 11 may be coupled to each other.
- ) may be performed in an area where the number of overlapping layers of the first uncoated area 11 is 10 or more on the curved surface 102 of the first uncoated area 11 .
- the radial ratio of the section in which the number of overlapping layers is 10 or more may be designed to be 25% or more based on the radius of the electrode assembly excluding the core by adjusting the length of the first uncoated region 11 .
- the current collector 30 When the current collector 30 is welded to the curved 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 11a In order to increase the number of overlapping layers of the first uncoated area 11 , the height of the fragment 11a needs to be increased. However, when the height of the segment 11a is increased, a swell may occur in the first uncoated region 11 during the manufacturing process of the first electrode current collector. Therefore, the height of the segment 11a is preferably adjusted 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.
- 1D shows the outer periphery of 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 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 more than 10 sheets appears while being bent from the 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 area 11 divided into a plurality of segments increases to 18 from the outer peripheral surface of the electrode assembly to a 7 mm section, , 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 a radius of 7 mm to 12 mm.
- the uniform number of layers is defined as a radius section from the point where the number of overlapping layers reaches the maximum to the point where the innermost segment is located, as shown in FIG. 1D . Accordingly, the ratio of the uniform number of stacked sections in which 10 or more segments 11a 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 in stages from 3 mm to 7 mm in the radius of 7 mm to 11 mm. Therefore, the ratio of the uniform number of layers in which 10 or more fragments 11a of the first uncoated region 11 are overlapped is the core (4 mm). It is 50% (9/18) of the radius of the electrode assembly excluding it.
- 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 11a 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 space occupied by the first uncoated area 11 may be reduced, thereby improving energy density.
- the bonding force may be improved and the resistance reduced.
- 8A to 10 are views for explaining a welding area between the current collector 30 and the first uncoated region 11 .
- a weld bead BD may be formed in a welding region between the first uncoated portion 11 and the tab coupling portion 32 .
- the weld bead BD refers to an approximately circular welded portion formed when spot welding is performed at a specific point. For example, in FIG. 11, the substantially circular weld bead BD formed as a result of spot welding is shown.
- a specific welding pattern may be formed. For example, referring to FIG. 8A , a plurality of welding beads BD may be gathered to form a substantially linear welding pattern.
- the plurality of welding beads BD formed between the first uncoated portion 11 and the tab coupling portion 32 includes a welding pattern extending in a radial direction of the electrode assembly 10 .
- the welding bead BD formed between the first uncoated portion 11 and the tab coupling portion 32 forms a linear welding pattern extending along the radial direction of the electrode assembly 10 . can do.
- a welding pattern formed between the first uncoated portion 11 and the tab coupling portion 32 may have a line shape in which point welding is connected.
- a width of the weld bead BD formed between the first uncoated part 11 and the tab coupling part 32 may be about 0.1 mm or more. This is because the minimum width of the weld bead BD is about 0.1 mm or more in consideration of the laser technology.
- the longitudinal end of the tab coupling part 32 may be located more inside than the innermost point of the beading part 21 formed in the battery housing 20 . More specifically, the boundary area between the tab coupling part 32 and the housing coupling part 33 is directed toward the winding center hole H1 rather than the innermost point of the beading part 21 formed in the battery housing 20 . may be located further inside. According to such a structure, it is possible to prevent damage to the coupling portion between parts that may occur as the current collector 30 is excessively bent to position the end of the housing coupling part 33 on the beading part 21 . have. In other words, when viewed along the longitudinal axis of the battery housing 20 , the at least one tab coupling part 32 may have a shape that is not overlapped by the beading part 21 .
- first uncoated portion 11 in order to secure a bonding force and reduce electrical resistance through an increase in the bonding area between the current collector 30 and the electrode assembly 10 , not only the tab coupling portion 32 but also the central portion 31 is a first uncoated portion 11 .
- An end of the first uncoated portion 11 may be folded in a bent form to be parallel to the tab coupling portion 32 .
- the coupling area is increased to obtain an effect of improving coupling force and reducing electrical resistance
- the energy density improvement effect can be obtained by minimizing the total height of the electrode assembly 10 .
- the at least one housing coupling part 33 may extend from an end of the tab coupling part 32 to be coupled to the beading part 21 on the inner surface of the battery housing 20 .
- the at least one housing coupling part 33 may extend from an end of the tab coupling part 32 toward the sidewall of the battery housing 20 .
- the housing coupling part 33 may be provided in plurality, for example.
- each of the plurality of housing coupling portions 33 may be positioned to be spaced apart from each other along the circumference of the central portion 31 .
- the plurality of housing coupling parts 33 may be coupled to the beading part 21 of the inner surface of the battery housing 20 . As shown in FIGS.
- the upper surface of the beading part 21 extends in a direction approximately parallel to the lower surface of the battery housing 20 , that is, in a direction approximately perpendicular to the sidewall of the battery housing 20 , and the housing Since the coupling part 33 also has a shape extending in the same direction, the housing coupling part 33 can be stably contacted on the beading part 21 . In addition, as the housing coupling part 33 is stably in contact with the beading part 21, welding between the two parts can be made smoothly, thereby improving the coupling force between the two parts and minimizing the increase in resistance at the coupling part.
- the current collector 30 is coupled on the beading part 21 of the battery housing 20 rather than the inner surface of the cylindrical part of the battery housing 20 as described above, the current collector 30 and the beading part ( 21) can be reduced. Accordingly, the dead space inside the battery housing 20 is minimized, so that the energy density of the battery 1 can be improved.
- the housing coupling part 33 includes a contact part 33a coupled to the beading part 21 on the inner surface of the battery housing 20 and a tab coupling part 32 and a contact part 33a. It includes a connecting portion (33b) for connecting between them.
- the contact portion 33a is coupled to the inner surface of the battery housing 20 .
- the contact part 33a may be coupled to the beading part 21 as described above.
- both the beading portion 21 and the contacting portion 33a are in a direction approximately parallel to the lower surface of the battery housing 20 , that is, approximately perpendicular to the sidewall of the battery housing 20 for stable contact and coupling. It may have a shape extending along the direction.
- the contact portion 33a may have a flat surface coupled to an upper surface of the beading portion 21 facing the open portion. That is, the contact portion 33a includes at least a portion of the flat portion substantially parallel to the lower surface of the battery housing 20 .
- the connecting portion 33b may extend in a radial direction and a winding axial direction.
- the connection part 33b may have an upwardly convex structure.
- the connection part 33b may have a curved shape convex upward.
- the connection part 33b may include at least one bent part C.
- the at least one bent portion C may be bent at an obtuse angle so as not to overlap each other when viewed along the longitudinal axis of the battery housing. More preferably, a boundary point between the contact portion 33a and the connection portion 33b may be bent at an obtuse angle. That is, as shown in FIG. 13F , the inclination of the connecting portion 33b may be gradually or gradually decreased as the connecting portion 33b moves toward the beading portion.
- the connection part 33b includes at least one bending part B whose extension direction is switched between the central part 31 and the contact part 33a at least once. can do. That is, the 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 connecting portion (33b) may be elastically biased upward by the bending portion (B).
- the structure of the connection part 33b is a contact part in the 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. (33a) to be in close contact on the beading portion (21).
- the shape may be more stably implemented during the sizing process.
- connection portion between the contact portion 33a and the connection portion 33b may be bent.
- the connection portion between the contact portion 33a and the connection portion 33b may have a complementary shape corresponding to the inner surface of the beading portion 21 .
- the connecting portion between the contact portion 33a and the connecting portion 33b may be seamlessly coupled to the beading portion 21 while having a shape matching the inner surface of the beading portion 21 .
- the beading part 21 can effectively support the current collector 30 .
- unnecessary interference between the beading part 21 and the connecting part 33b can be prevented. Therefore, a stable coupling between the contact portion 33a and the beading portion 21 can be effectively maintained.
- the protruding outermost point of the bending part B may be spaced apart from the innermost point of the beading part 21 by a predetermined distance.
- the bending part B may not contact the beading part 21 . According to such a structure, unnecessary interference between the beading part 21 and the connecting part 33b can be prevented. Therefore, a stable coupling between the contact portion 33a and the beading portion 21 can be effectively maintained.
- the angle between the contact portion 33a and the connection portion 33b may be an acute angle by the bending portion B.
- the connecting part 33b does not include a bending part. Accordingly, the angle between the contact portion 33a and the connection portion 33b may be an obtuse angle.
- the connection part 33b includes a bending part. Accordingly, the angle between the contact portion 33a and the connection portion 33b may be an acute angle. According to this structure, since the angle between the contact portion 33a and the connection portion 33b is formed at an acute angle, interference between the beading portion 21 and the connection portion 33b can be prevented.
- the vertical distance between the contact portion 33a and the central portion 31 in a state in which there is no deformation because no external force is applied to the current collector 30 is an electrode assembly in a state in which the current collector 30 is coupled. (10) is preferably equal to the vertical distance between the upper surface of the beading portion 21 and the central portion 31 when seated in the battery housing 20 or smaller within the extendable range of the connecting portion 33b do.
- the connection part 33b is configured to satisfy such a condition, when the electrode assembly 10 to which the current collector 30 is coupled is seated in the battery housing 20 , the contact part 33a is on the beading part 21 . can be naturally attached to
- connection part 33b can be contracted and stretched is within a certain range even if the electrode assembly 10 moves up and down due to vibration and/or impact occurring during the use of the battery 1 , the electrode assembly 10 . Make sure that the shock caused by the movement is alleviated.
- the connecting portion 33b may have an upwardly convex curved shape.
- the connection part 33b may protrude in a direction toward a winding center of the electrode assembly 10 .
- the shape of the connection part 33b is a combination of the current collector (first current collector) 30 and the electrode assembly 10 and/or the current collector (first current collector) 30 during the sizing process. ) and the battery housing 20 to prevent damage from occurring.
- 13A to 13D are views for explaining a process of manufacturing the battery 1 of the present invention.
- FIG. 13A is a view for explaining a welding process of the current collector 30 .
- the first uncoated region 11 protruding upward of the electrode assembly 10 and the current collector 30 are welded. indicates the process.
- the tab coupling portion 32 of the current collector 30 is welded on the bent surface on which the plurality of segment pieces 11a provided in the first uncoated area 11 are bent.
- FIG. 13B is a view for explaining a beading process of the battery housing 20 .
- the beading knife may advance toward the inside of the battery housing 20 .
- a beading portion 21 in which a part of the battery housing 20 is press-fitted toward the inside of the battery housing 20 is provided on the side surface of the battery housing 20 . Since the beading portion 21 is located below the contact portion 33a of the current collector 30 , the contact portion 33a and the inner side of the beading portion 21 may be welded to each other later.
- FIG. 13C is a view for explaining a crimping process of the battery housing 20 .
- the contact portion 33a of the current collector 30 may be placed on the upper surface of the beading portion 21 .
- a cap 40 whose end is wrapped by a sealing gasket G1 may be placed on the upper surface of the contact portion 33a.
- the battery housing 20 is bent to surround the edge of the cap 40 to fix the cap 40 and the current collector 30 .
- the cap 40 and the current collector 30 are fixed on the beading part 21 by the shape of the folded crimping part 22 .
- FIG. 13D is a view for explaining a sizing process of 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 battery 1 in manufacturing the battery 1 .
- the electrode assembly 10 may be partially compressed by being pressed by the beading portion 21 .
- the current collector 30 may be bent under pressure in the vertical direction.
- the connecting portion 33b has an upwardly convex shape as shown in FIG. 13f
- the upward lifting phenomenon of the tab coupling portion 32 may be maximally suppressed as shown in FIG. 13d . That is, when the battery housing 20 of FIG. 13C is compressed in the vertical direction, the current collector 30 of the present invention is subjected to stress in the vertical direction.
- the connecting portion 33b of the current collector 30 of the present invention has an upwardly convex shape, the stress applied to the tab coupling portion 32 may be minimized. Accordingly, the tab coupling portion 32 may not be bent upward, and a welded connection with the first uncoated portion 11 may be satisfactorily maintained.
- connection part 33b before the sizing process is upward based on an imaginary straight line connecting one end of the contact part 33a and one end of the tab coupling part 32 .
- at least one bent portion C forming an obtuse angle may be provided on the connection portion 33b.
- the bent portion C passes through the center of an imaginary straight line connecting one end of the contact portion 33a and one end of the tab coupling portion 32 and is parallel to the bottom surface of the battery housing 20 . It may be located above the plane.
- the length of the connecting portion 33b close to the tab coupling portion 32 with respect to the bent portion C is greater than the length of the connecting portion 33b close to the contact portion 33a with respect to the bent portion C. , can be formed longer.
- 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 FIG. 13F. The level of elevation varies depending on a change in the height of the battery housing 20 during the sizing process. Contrary to what is shown. The position of the bent portion C may be raised only up to the height level of the contact portion 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 lifting phenomenon in which the tab coupling portion 32 is lifted upward does not occur.
- the length of the connecting portion 33b close to the tab coupling portion 32 with respect to the bent portion C is the length of the connecting portion 33b close to the contact portion 33a with respect to the bent portion C. 33b), since it is longer than the length, insertion of the current collector 30 into the battery housing 20 is facilitated, and stress distribution can be made effectively.
- the profile of the current collector 30 after the sizing process may be deformed differently from FIG. 13F .
- the connection part 33b after the sizing process, the connection part 33b may be deformed into a raised structure in an upwardly convex curve shape, whereas in FIG. 13g , the connection part 33b after the sizing process is bent from the bent part C It can be transformed into a straight line. More specifically, in FIG. 13g, after the sizing process, the connection part 33b close to the tab coupling part 32 based on the bent part C and the connection part close to the contact part 33a based on the bent part C. (33b) may be deformed so that the connecting portion (33b) convexly protrudes upward while maintaining a straight shape, respectively.
- 13E is a view for comparing the degree of damage to the welding area of the current collector 30 after the sizing process according to the difference in the shape of the current collector 30 before the sizing process.
- 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 a connection part before sizing ( 33b) is an upwardly convex experimental example.
- the welding area with the tab coupling part 32 was lifted by about 0.72 mm.
- Experimental Example 2 in which the connection part 33b was convex downward, a phenomenon in which the welding area with the tab coupling part was lifted by about 0.99 mm occurred.
- connection part 33b is a linear shape
- Experimental Example 2 in which the connection part 33b has a downward convex shape
- the stress applied to the welded portion of the current collector 30 and the electrode assembly 10 in the sizing process Since these values were very large as approximately 4.5 MPa and 3.7 MPa, respectively, it was confirmed that the floating phenomenon of the current collector 30 was deepened.
- Experimental Example 3 in which the connection part 33b has an upwardly convex shape, the stress applied to the welded portion of the current collector 30 and the electrode assembly 10 in the sizing process was approximately 2.0 MPa in Experimental Examples 1 and 2 Since it is relatively low compared to that, it can be seen that the current collector 30 has a relatively small lifting phenomenon.
- the slope of the connecting portion 33b is not constant and the slope of the upper portion may be smaller than the slope of the lower portion based on a predetermined point (eg, the bent portion C).
- 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.
- the connection part 33b may include at least one bent part C based on the predetermined point.
- the at least one bent portion C 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 .
- the inclination of the connecting portion 33b may be gradually or gradually reduced as the connecting portion 33b goes toward the beading portion 21 .
- the angle ⁇ between the tab coupling part 32 and the connection part 33b may be, for example, between 0 and 90 degrees.
- the tab coupling portion 32 and the contact portion 33a may be positioned at the same height. . That is, in this case, the angle ⁇ between the tab coupling part 32 and the connection part 33b is 0 degrees. Even when the sizing process is performed, it is not preferable that the contact portion 33a is positioned lower than the tab coupling portion 32 .
- 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 90 degrees according to a shape in which the length, thickness, or inclination of the connection portion 33b is changed stepwise or gradually.
- connection part 33b may support the cap 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 cap 40 .
- the connection part 33b may serve to support the cap 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 battery 1 , since the current collector 30 fixes the electrode assembly 10 in the vertical direction, the electrode assembly 10 is formed in the battery housing 20 . Unnecessary movement up and down inside can be prevented.
- 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 since 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. Accordingly, the upper surface of the beading part 21 and the lower surface of the beading part 21 may have an asymmetrical shape based on a virtual reference plane passing through the innermost point of the beading part 21 .
- the press-fitting depth of the beading portion 21 may be defined as PD.
- a 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 press-in 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. 11 , the overlap length OV refers to a radial length of an area where the orthographic projection and the current collector 30 overlap when the beading part 21 is vertically projected.
- the battery 1 of the present invention may satisfy the following relational expression.
- the ratio is preferably (R 1,min +W bead,min )/ PDmax or more.
- a region overlapping more than the radius of curvature R1 of the beading portion 21 is required. .
- the contact portion 33a overlaps only by the radius of curvature R1 of the beading portion 21, the contact portion 33a is in contact with the beading portion 21 only at one contact point because the flat section F does not exist.
- 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. At this time, the length of the additional overlapping area is at least the weld bead width (W bead ). . 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 minimum welding bead width (W bead ) to enable stable welding 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 R 1,min +W bead,min .
- the ratio is preferably (PD max -R 2,min )/PD max or less.
- a radius of curvature R2 exists in a boundary region between the beading portion 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 with the beading portion 21 is PD max -R 2,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 R 1,min and R 2,min may each be approximately 0.05 mm, W bead,min may be about 0.1mm.
- 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 (R 1,min ) of the radius of curvature (R1), and the beading portion 21 for welding of the contact portion 33a. It can be determined from the length of the minimum width (W bead,min ) of the minimum width of the contact portion (33a) to be in contact with the upper surface of the weld bead (BD) (W bead,min ).
- 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 (R 1,min ) of the radius of curvature R1 may be 0.05 mm.
- a 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 on 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.
- 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 (R 1,min +0.5*0.1mm) from the innermost point of the beading portion 21 by (R 1,min +0.5*0.1mm). It corresponds to an isolated point.
- R 1,min is the minimum value 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 spaced apart from the inner surface of the battery housing by the radius of curvature (R 2,min ).
- R 2,min is the minimum value 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 spaced apart by (PD-R 2,min -0.05mm) based on the innermost point of the beading portion 21 .
- PD-R 2,min -0.05mm is the point that has been In one example, when R 2,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 portion 21 .
- the welding position region based on the indentation depth PD may be a region of 1% or more and 99% or less based on the indentation depth PD.
- the 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. 11 , the flat section F corresponds to a length obtained by subtracting the 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 part 21 and the contact part 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 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 of 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 where the current collector 30 contacts the electrode assembly 10 is the central portion 31 .
- the tab coupling portion 32 a region where the current collector 30 contacts the electrode assembly 10 is the central portion 31 .
- 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 current collector 30 according to another embodiment of the present invention has only a difference in the shape of the contact portion 33a compared to the current collector 30 of FIG. 4A described above, and otherwise the current collector ( 30) may be applied substantially the same.
- the contact portion 33a may have a greater width than the connection portion 33b.
- at least a portion of the contact portion 33a may extend along the inner circumferential surface of the battery housing 20 .
- the contact portion 33a may have an arc shape extending along the beading portion of the battery housing 20 .
- the current collector 30 includes the battery housing 20 as the sum of the extended lengths of the contact portions 33a of the at least one housing coupling portion 33 . ) may be configured to be approximately equal to the inner periphery of the . In such an embodiment, it is possible to have the effect of improving the bonding force and reducing the electrical resistance due to the maximization of the bonding area.
- a current collector 30 according to another embodiment of the present invention is shown.
- the current collector 30 according to another embodiment of the present invention is different from the current collector 30 of FIG. 5 only in the form of the contact part 33a and the connection part 33b, and the others are described above.
- the structure of the current collector 30 may be applied substantially the same. That is, the connecting portion 33b may have a greater width than the tab coupling portion 32 . Alternatively, as another embodiment, the connecting portion 33b may have a smaller width than the tab coupling portion 32 .
- connection part 33b may extend along the inner circumferential surface of the battery housing 20 .
- the contact portion 33a may have an arc shape extending along the beading portion of the battery housing 20
- the connection portion 33b may have an arc shape extending along the contact portion 33a. have.
- the current collector 30 may not include the bending part B, unlike the current collector 30 illustrated in FIG. 4A or FIG. 5 .
- the bending part B is not provided, raw materials required for manufacturing the current collector 30 can be reduced. Accordingly, the manufacturing cost of the current collector 30 can be reduced.
- the cap 40 covers the opening formed on one side of the battery housing 20 .
- the cap 40 may be fixed by a crimping part 22 formed on the top of the battery housing 20 .
- the sealing gasket G1 may be interposed between the battery housing 20 and the cap 40 in order to improve the fixing force and the sealing property of the battery housing 20 .
- the cap 40 is not a component that should function as a passage of current. Therefore, if the battery housing 20 and the cap 40 can be firmly fixed through the application of another structure well known in the related art and the airtightness of the opening of the battery housing 20 can be secured, the sealing gasket G1 Application is not essential.
- the sealing gasket G1 is a sealing gasket interposed between the opening part of the battery housing 20 and the current collector 30 ( As G1), a portion in contact with the beading portion 21 of the current collector 30 may be configured to be positioned between the beading portion 21 and the sealing gasket G1.
- the sealing gasket G1 may have a substantially ring shape surrounding the cap 40 .
- the sealing gasket G1 may simultaneously cover the upper surface, the lower surface, and the side surface of the cap 40 .
- the radial length of a portion of the sealing gasket G1 that covers the lower surface of the cap 40 is smaller than the radial length of a portion of the sealing gasket G1 that covers the upper surface of the cap 40, or can be the same If the radial length of the portion covering the lower surface of the cap 40 among the portions of the sealing gasket G1 is too long, in the process of compressing the battery housing 20 up and down during the sizing process, the sealing gasket G1 is the current collector ( 30), there is a possibility that the current collector 30 may be damaged or the battery housing 20 may be damaged.
- the sealing gasket G1 is connected to the connection part.
- the shape of the connecting portion 33b may be deformed or a part of the connecting portion 33b may be damaged by excessively pressing the 33b. Therefore, it is necessary to keep the radial length of the portion covering the lower surface of the cap 40 among the portions of the sealing gasket G1 to be small at a certain level.
- a portion of the sealing gasket G1 that covers the upper surface of the cap 40 is not likely to interfere with the current collector 30 due to its structural and positional characteristics.
- the battery housing 20 and the cap 40 do not necessarily need to be insulated from each other. That is, the portion covering the upper surface of the cap 40 among the portions of the sealing gasket G1 suffices if only the sealing function is satisfied, and does not need to satisfy the insulation and other separate functions, so that the limitation on the length thereof is relatively small.
- the radial length of the portion covering the lower surface of the cap 40 among the portions of the sealing gasket G1 is determined to cover the upper surface of the cap 40 among the portions of the sealing gasket G1. may be equal to the radial length of the region.
- the radial length of the portion covering the lower surface of the cap 40 among the portions of the sealing gasket G1 covers the upper surface of the cap 40 among the portions of the sealing gasket G1. It may be formed to be smaller than the radial length of the part.
- the contact part 33a may be interposed between the beading part 21 of the battery housing 20 and the sealing gasket G1 to be fixed. That is, in a state in which the contact portion 33a is interposed between the beading portion 21 of the battery housing 20 and the sealing gasket G1, due to the crimping force of the crimping portion 22, the contact portion 33a can be fixed.
- the thickness of the sealing gasket G1 may be varied along the circumferential direction.
- the thickness of the sealing gasket G1 may alternately repeat an increase and a decrease in the circumferential direction.
- the sealing gasket G1 may have the same compressibility in a region in contact with the contact portion 33a and in a region not in contact with the contact portion 33a. That is, in an uncompressed state, the thickness of the sealing gasket G1 may be configured to vary along the circumferential direction.
- the sealing gasket G1 may have a smaller compressibility in a region not in contact with the contact portion 33a than in a region in contact with the contact portion 33a. That is, in an uncompressed state, the sealing gasket G1 may be configured to have a constant thickness along the circumferential direction, and may be configured to have a different thickness only in a certain area as it is compressed by a later crimping force.
- the sealing gasket G1 may have a greater thickness in a region not in contact with the contact portion 33a than in a region in contact with the contact portion 33a. That is, although not shown in the drawings, the sealing gasket G1 may have a relatively high compressibility in a region in contact with the contact portion 33a.
- a welding portion may be formed between the beading portion 21 of the battery housing 20 and the contact portion 33a of the current collector.
- the fixing of the contact portion 33a may not be reliably achieved using only the crimping force.
- the sealing gasket G1 is contracted by heat or the crimping part 22 is deformed due to an external shock, there is a possibility that the bonding force between the current collector and the battery housing 20 may be reduced. Accordingly, the current collector 30 may be fixed to the battery housing 20 by welding while the contact portion 33a is placed on the beading portion 21 of the battery housing 20 .
- the manufacturing process of the battery 1 may be completed by placing the cap 40 wrapped by the sealing gasket G1 on the top of the contact part 33a and forming the crimping part 22 .
- the welding method for example, laser welding, resistance welding, ultrasonic welding, etc. are possible, but the welding method is not limited thereto.
- the bonding force of the welding portion is increased, and even in the battery behavior for a long time. Surface adhesion can be ensured. Accordingly, it is possible to minimize safety problems such as cycle fading.
- 8A to 10 are views for explaining a welding area between the contact portion 33a and the beading portion 21 .
- a weld bead BD may be formed in a welding region between the contact portion 33a and the bead portion 21 .
- the contact part 33a may be seated on the inclined upper surface of the beading part 21 .
- a flat section F in which the upper surface of the beading part 21 and the lower surface of the beading part 21 are parallel to the lower surface of the battery housing 20 in at least some regions, respectively.
- the contact portion 33a may be seated on a flat upper surface of the beading portion 21 . And after that, the contact portion 33a may be welded onto the beading portion 21 .
- 11 is a view for explaining the position, length, and width of the weld bead BD formed in the weld region between the contact portion 33a and the beading portion 21 .
- the contact portion 33a may be welded to the flat upper surface of the beading portion 21 .
- a predetermined welding pattern may be formed.
- a plurality of welding beads BD may be gathered to form a substantially linear welding pattern.
- the welding pattern formed between the beading part 21 and the contact part 33a may have a line shape in which point welding is connected.
- a width of the weld bead BD formed between the beading part 21 and the contacting part 33a may be about 0.1 mm or more. This is because the minimum width of the weld bead BD is about 0.1 mm or more in consideration of the laser technology.
- At least one weld bead BD formed between the beading part 21 and the contacting part 33a may be formed.
- a plurality of welding beads BD formed between the beading portion 21 and the contacting portion 33a may be formed in a circumferential direction.
- a plurality of weld beads BD formed between the beading part 21 and the contacting part 33a may be formed in the same contacting part 33a.
- the plurality of weld beads BD formed in the same contact portion 33a may be symmetrically formed in the same contact portion 33a.
- the plurality of welding beads BD formed in the same contact portion 33a may be formed at a predetermined angle, for example, 30 degrees apart from each other.
- the plurality of welding beads BD formed in the same contact portion 33a are located within the circumferential angle range of 30 degrees or less based on the center of the circle formed by the beading portion 21 in the same contact portion 33a.
- the welding bead BD formed between the beading portion 21 and the contacting portion 33a may form a linear welding pattern extending in a circumferential direction.
- the welding bead BD formed between the beading portion 21 and the contacting portion 33a may form an arc-shaped welding pattern extending in a circumferential direction.
- the circumferential length of the contact portion 33a may be the same as the circumferential length of the tab coupling portion 32 .
- the circumferential length of the contact portion 33a may be the same as the circumferential length of the connecting portion 33b. For example, as shown in FIG.
- the tab coupling part 32 , the connection part 33b and the contact part 33a may extend to have the same width.
- the tab coupling part 32 , the connection part 33b and the contact part 33a may have the same width along the extension direction.
- the extending direction of the welding pattern formed between the first uncoated portion 11 and the tab coupling portion 32 and the welding pattern formed between the beading portion 21 and the contact portion 33a may be different from each other.
- an extension direction of a welding pattern formed between the first uncoated portion 11 and the tab coupling portion 32 and an extension of a welding pattern formed between the beading portion 21 and the contact portion 33a The directions may be approximately perpendicular to each other.
- a welding pattern formed between the first uncoated portion 11 and the tab coupling portion 32 may be formed along a radial direction.
- a welding pattern formed between the beading portion 21 and the contact portion 33a may be formed along a circumferential direction of the battery housing 20 . That is, an extension direction of a welding pattern formed between the first uncoated portion 11 and the tab coupling portion 32 and an extension direction of a welding pattern formed between the beading portion 21 and the contact portion 33a may be approximately perpendicular to each other. According to such a structure, the bonding strength between the current collector 30 and the electrode assembly 10 may be increased. That is, according to this structure, since the current collector 30 is fixed by welding performed in various directions, even if the current collector 30 receives vibration or shock in a specific direction, it can maintain a firmly fixed state.
- the circumferential length of the contact portion 33a may be relatively longer than the circumferential length of the tab coupling portion 32 .
- the circumferential length of the contact portion 33a may be relatively longer than the circumferential length of the connecting portion 33b.
- FIGS. 5 and 6 it can be seen that the circumferential length of the contact portion 33a is relatively longer than the circumferential length of the tab coupling portion 32 .
- FIG. 5 it can be seen that the circumferential length of the contact portion 33a is relatively longer than the circumferential length of the connecting portion 33b .
- the bonding force of the current collector 30 with the beading portion 21 may be improved. Furthermore, the internal resistance of the battery can be reduced by making the contact portion 33a and/or the connecting portion 33b longer in the circumferential direction.
- the contact part 33a may have an arc shape extending in the circumferential direction along the beading part 21 of the battery housing. More specifically, the contact portion 33a may have an arc shape extending in opposite directions along the circumferential direction from the intersection of the connection portion 33b and the contact portion 33a.
- connection part 33b may also have an arc shape extending in the circumferential direction along the contact part 33a.
- the contact portion 33a has an arc shape extending in the circumferential direction along the beading portion 21 of the battery housing, the coupling force between the beading portion 21 and the current collector may be improved.
- the sum of the lengths of the contact portions 33a extending in the circumferential direction may be configured to correspond to the length of the inner circumference of the battery housing. That is, although not shown in the drawings, the current collector 30 may have a ring shape in which the contact portions 33a are connected to each other. According to such a shape, the coupling force between the beading part 21 and the current collector 30 can be further improved.
- FIG. 12 is a view for explaining the relationship between the diameter of the inner surface of the battery housing and the total diameter of the current collector.
- the cap 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 in a part of the cap 40 and corresponds to an area structurally weaker than the surrounding area so as to be easily broken when internal pressure is applied.
- the venting part 41 may be, for example, a region having a smaller thickness than the peripheral region.
- the terminal 50 is electrically connected to the second uncoated region 12 of the electrode assembly 10 through the battery housing 20 from the opposite side of the open portion of the battery housing 20 .
- 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) P 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 has a riveted structure.
- the battery to which the riveting structure of the terminal 50 is applied may perform electrical wiring in one direction.
- the terminal 50 having a riveting structure has a large cross-sectional area and low resistance, it is very suitable for rapid charging.
- 18A and 18B are views for explaining a second current collector P according to an embodiment of the present invention.
- the second current collector P may be interposed between the second uncoated region 12 and the terminal 50 .
- the second current collector P may include a tab coupling part P1 coupled to the second uncoated part 12 ; and a terminal coupling part (P2) coupled to the terminal (50).
- the second current collector P may further include a connecting portion P3 and/or an edge portion P4.
- the tab coupling portion P1 may be provided in plurality.
- the plurality of tab coupling portions P1 may be disposed at the same distance from each other.
- Each of the plurality of tab coupling portions P1 may have the same length as each other.
- the terminal coupling portion P2 may be disposed to be surrounded by a plurality of the tab coupling portions P1 .
- the terminal coupling part P2 may be disposed at a position corresponding to the winding center hole H1 formed in the winding center of the electrode assembly 10 . More preferably, the terminal coupling part P2 may cover the winding center hole H1 of the electrode assembly 10 . According to such a structure, the terminal 50 and the terminal coupling portion P2 positioned above the winding center hole H1 of the electrode assembly 10 may be welded to each other.
- the tab coupling part P1 and the terminal coupling part P2 may not be directly connected and may be disposed to be spaced apart from each other.
- the tab coupling part P1 and the terminal coupling part P2 may be indirectly connected by the edge part P4 .
- the second current collector P according to an embodiment of the present invention has a structure in which the tab coupling portion P1 and the terminal coupling portion P2 are not directly connected to each other, but connected through the edge portion P4.
- the second current collector (P) of the present invention has a structure in which stress can be concentrated on the connection portion of the edge portion (P4) and the terminal coupling portion (P2) when an external impact is applied, such a connection portion between the parts Since the welding part for bonding is not formed, it is possible to prevent the occurrence of product defects due to damage to the welding part due to external impact.
- the second current collector P may further include a connection portion P3 connected to the terminal coupling portion P2. At least a portion of the connection portion P3 may be formed to have a smaller width than that of the tab coupling portion P1 . In this case, when the electric resistance increases in the connection part P3 and a current flows through the connection part P3, a greater resistance is generated compared to other parts, and as a result, when an overcurrent occurs, a part of the connection part P3 is It is broken so that the overcurrent can be cut off.
- the width of the connection part P3 may be adjusted to an appropriate level in consideration of the overcurrent blocking function.
- the second current collector P may further include a rim portion P4 having a substantially rim shape with an empty space formed therein.
- the tab coupling portion P1 may extend inwardly from the edge portion P4 and be coupled to the second uncoated portion 12 .
- the rim portion P4 may have a substantially rectangular rim shape or other shape unlike the one illustrated.
- the connection part P3 may include a notched part N formed to partially reduce the width of the connection part P3 .
- the position of the notched part N may be included in the uniform number of stacking sections (FIG. 1D). More preferably, the position of the notched portion N may be included in a section in which the number of stacks is maintained at a maximum among the uniform number of stacked sections. Accordingly, it is possible to reliably prevent byproducts generated when the notch N is broken from penetrating into the electrode assembly.
- the tab coupling part P1 is The longest radius reaching the end may be greater than the longest radius extending from the center of the current collector 30 to the end of the tab coupling part 32 .
- the radius of the rim portion P4 having a substantially rim shape may be greater than the longest radius from the center of the current collector 30 to the end of the tab coupling portion 32 . This is a result of limiting a welding area between the tab coupling portion 32 of the current collector 30 and the first uncoated portion 11 as the beading portion 21 is press-fitted into the battery housing 20 .
- the tab coupling portion P1 of the second current collector P may be coupled to the bent end of the second uncoated portion 12 . That is, the tab coupling portion P1 of the second current collector P may be welded to a curved surface in which a plurality of segment pieces provided in the second uncoated portion 12 are bent.
- the welding area may overlap the uniform number of lamination sections (FIG. 1D) along the radial direction by at least 50% or more, and the larger the overlap ratio is, the more preferable. More preferably, the welding area may overlap a section having the maximum number of overlapping layers in a section with a uniform number of stacks along the radial direction by at least 50% or more, and it is more preferable that the overlap ratio is larger.
- a welding region for coupling the tab coupling portion P1 of the second current collector P and the bent end of the second uncoated portion 12 is further formed, and the first 2
- the distance from the center of the terminal coupling portion P2 of the current collector P to the welding area is the same as the distance from the center of the current collector 30 to the welding area on the tab coupling portion 32, or approximately 5 It can have a distance deviation of % or less.
- the welding region of the second current collector P may have a longer length than the welding region on the tab coupling portion 32 of the current collector 30 .
- the diameter of the arc welding pattern is 2 mm or more, preferably 4 mm or more.
- the tensile strength of the weld is increased to 2kgf or more to secure sufficient welding strength.
- the diameter of the circular welding pattern is preferably 2 mm or more. If the diameter of the circular welding pattern satisfies the relevant conditions, it is possible to secure sufficient welding strength by increasing the weld tensile strength to 2kgf or more.
- the diameter of the flat portion of the terminal 50 corresponding to the weldable region may be adjusted in the range of 3 mm to 14 mm. If the radius of the flat portion of the terminal 50 is smaller than 3 mm, it is difficult to form a welding pattern having a diameter of 2 mm or more using a laser welding tool, an ultrasonic welding tool, or the like. In addition, when the radius of the flat portion of the terminal 50 exceeds 14 mm, the size of the terminal 50 becomes excessively large, so that the area occupied by the outer surface of the bottom of the battery housing 20 is reduced, so that the electrical connection part (bus bar) through the outer surface It is difficult to connect
- the area ratio of the weld pattern to the area of the weldable area is 2.04 (100* ⁇ 1 2 / ⁇ 7 2 )% to 44.4 (100* ⁇ 1 2 / ⁇ 1.5 2 )%.
- the terminal 50 In consideration of the polarity and function of the terminal 50 , the terminal 50 must be insulated from the battery housing 20 having the opposite polarity. To this end, an insulating gasket G2 may be applied between the terminal 50 and the battery housing 20 . Alternatively, 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) P must maintain an insulating state from the battery housing 20 .
- the insulator S may be interposed between the second uncoated region 12 and the battery housing 20 and/or between the current collector (second current collector) P and the battery housing 20 .
- the terminal 50 may pass through the insulator S for electrical connection with the second uncoated region 12 .
- the inner surface of the bottom of the insulator S and the battery housing 20 may be in close contact with each other.
- 'close' means that there is no space (gap) that can be visually confirmed.
- the distance from the inner surface of the bottom of the battery housing 20 to the flat portion of the terminal 50 may have a value equal to or slightly smaller than the thickness of the insulator S.
- the entire surface of the battery housing 20 may function as the first electrode terminal T1.
- the first electrode terminal T1 may be a negative terminal.
- the 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, a sufficient area for welding parts for electrical connection has the advantage that it is possible to secure
- the electrode constituting the electrode assembly 10 may have a segmented structure for ease of bending the uncoated region 11 .
- the electrode plate has a sheet-shaped first electrode collector made of a foil of a conductive material, an active material layer formed on at least one surface of the first electrode collector, and an active material is not coated on the long side end of the first electrode
- the first uncoated region 11 is included.
- 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 the same height (length in the Y direction) and/or width (length in the X direction) and/or the spacing pitch.
- 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 freely deformed into a quadrangle, a flat quadrilateral, a semi-circle, or a semi-ellipse.
- the height of the segment 11a may be increased stepwise along one direction parallel to the winding direction of the electrode assembly, for example, from the core side to the outer circumferential side.
- the core-side uncoated region 11 ′ adjacent to the core may not include the segment 11a , and the height of the core-side uncoated region 11 ′ may be smaller than that of other uncoated regions.
- the outer periphery uncoated region 11 ′′ adjacent to the outer periphery may not include the segment 11a, and the height of the outer periphery uncoated region 11 ′′ may be smaller than that of other uncoated regions.
- the electrode plate may include an insulating coating layer 11b covering a boundary between the active material layer and the first uncoated region 11 .
- the insulating coating layer 11b includes an insulating polymer resin, and may optionally further include an inorganic filler.
- the insulating coating layer 11b prevents the end of the active material layer from coming into contact with the opposite polarity active material layer through the separator, and serves to structurally support the bending of the segment 11a.
- 15 is a cross-sectional view taken along the longitudinal direction (Y) of the electrode assembly 10 in which the uncoated segmental structure of the electrode plate according to the embodiment of the present invention is applied to the first electrode current collector and the second electrode current collector.
- the electrode assembly 10 may be manufactured by a winding method.
- the second uncoated region 12 protruding downwardly extends from the second electrode current collector, and the first uncoated region 11 protruding upwardly extends from the first electrode current collector.
- a pattern in which the heights of the uncoated regions 11 and 12 change 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 from the outer peripheral side to the core side along the radial direction of the electrode assembly 10 .
- the bent portion 101 is indicated by a dotted line box.
- the curved surfaces 102 are formed on the upper and lower portions of the electrode assembly 10 as the segment pieces 11a adjacent in a radial direction overlap each other in multiple layers.
- the core-side uncoated region (11' in FIG. 14) has a low height and is not bent, and the height (h) of the innermost curved segment 11a is the core-side uncoated region without the segment 11a structure.
- the winding center hole H1 in the core of the electrode assembly 10 is not closed by the bent segment pieces 11a. If the winding center hole H1 is not closed, there is no difficulty in the electrolyte injection process, and the electrolyte injection efficiency is improved. In addition, by inserting a welding tool through the winding center hole (H1), it is possible to easily perform welding of the terminal 50 and the second current collector (P).
- 17 is a diagram illustrating a state in which the batteries 1 are electrically connected using a bus bar 150 according to an embodiment of the present invention.
- the plurality of batteries 1 may be connected in series and in parallel at the top using a bus bar 150 .
- the number of batteries 1 may be increased or decreased in consideration of the capacity of the battery pack 3 .
- the terminal 50 may have a positive polarity, and the outer surface of the bottom of the battery housing 20 may have a negative polarity, and vice versa.
- the plurality of batteries 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 batteries 1 may be arranged in a closest packing structure. The densest packing structure is formed when an equilateral triangle is formed when the centers of the terminals 50 are connected to each other.
- the bus bar 150 may be disposed above the adjacent batteries 1 , preferably between the terminals 50 .
- the bus bars 150 may be disposed between adjacent rows.
- the bus bars 150 may be disposed between adjacent rows.
- the bus bar 150 connects the batteries disposed in the same row in parallel to each other, and connects the batteries disposed in two adjacent rows 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 part 151 may extend along the rows of the batteries 1 .
- the body portion 151 may extend along the row of the batteries 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 battery 1 and may be electrically coupled to the terminal 50 . Electrical coupling with the terminal 50 may be achieved through laser welding, ultrasonic welding, or the like.
- the plurality of second bus bar terminals 153 protrude from the other side of the body part 151 toward the outer surface of the bottom of the battery housing 20 of each battery 1, and may be electrically coupled to the outer surface. have. Electrical coupling with the outer surface may be achieved by laser welding or ultrasonic welding.
- 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 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 plurality of second bus bar terminals 153 may be manufactured as separate pieces and then coupled to each other through welding or the like.
- the battery 1 using the bus bar 150 is used. ) can be easily implemented for electrical connection.
- the coupling area of the bus bar 150 can be sufficiently secured to sufficiently lower the resistance of the battery pack including the battery 1 .
- the 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 battery 1 measured through a resistance meter between the positive and negative poles, that is, between the top surface of the terminal 50 and the outer surface of the closure of the battery housing 20, is 0.5 millimeters suitable for rapid charging.
- Ohm (miliohm) to 4 milliohm (miliohm) preferably 1 milliohm (miliohm) to 4 milliohm (miliohm) may be.
- the battery may be, for example, a battery having a form factor ratio (defined as the diameter of the battery divided by the height, that is, the ratio of the height (H) to the diameter ( ⁇ )) greater than about 0.4.
- the form factor means a value indicating the diameter and height of the battery.
- the diameter of the cylindrical battery may be 40mm to 50mm, and the height may be 60mm to 130mm.
- the cylindrical battery according to an embodiment 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 battery, and the next two numbers represent the height of the battery.
- the form factor of the battery is increasing compared to the conventional 1865, 2170, and the like.
- An increase in the form factor leads to an increase in energy density, increased safety against thermal runaway, and improved cooling efficiency.
- the energy density of a battery can be further increased when the unnecessary space inside the battery housing is minimized with an increase in the form factor.
- the battery according to the present invention has an optimal structure capable of lowering resistance while increasing the capacity of the battery while improving the coupling force between the current collector and the coupling portion of the battery housing.
- the battery according to an embodiment of the present invention may be a battery having a substantially cylindrical shape, having a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of about 0.418.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of about 0.640.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, having a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of about 0.436.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, having a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of about 0.600.
- a battery according to another embodiment may be a battery having a substantially cylindrical shape, having a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of about 0.575.
- batteries having a form factor ratio of about 0.4 or less have been used. That is, conventionally, for example, an 1865 battery, a 2170 battery, or the like has been used. For an 1865 battery, its diameter is approximately 18 mm, its height is approximately 65 mm, and the form factor ratio is approximately 0.277. For a 2170 battery, its diameter is approximately 21 mm, its height is approximately 70 mm, and the form factor ratio is approximately 0.300.
- a battery according to an embodiment of the present invention may be included in a battery pack, and the battery pack may be mounted in a vehicle.
- a battery pack 3 according to an embodiment of the present invention includes a secondary battery assembly to which a plurality of batteries 1 according to an embodiment of the present invention are electrically connected as described above, and accommodating the same. pack housing (2).
- components such as a bus bar, a cooling unit, and a power terminal for electrical connection are omitted for convenience of illustration.
- 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 operates by receiving power from the battery pack 3 according to an embodiment of the present invention.
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- Sealing Battery Cases Or Jackets (AREA)
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Abstract
Description
Claims (111)
- 제1 전극 및 제2 전극과 이들 사이에 개재된 분리막이 권취 축을 중심으로 권취됨으로써 코어와 외주면을 정의한 전극 조립체로서, 상기 제1 전극은, 권취 방향을 따라 활물질층이 코팅되어 있는 활물질부와, 활물질층이 코팅되지 않은 제1 무지부를 포함하고, 상기 제1 무지부의 적어도 일부는 그 자체로서 전극 탭으로서 사용되는 전극 조립체;일 측에 형성된 개방부를 통해 상기 전극 조립체를 수용하는 배터리 하우징;상기 제1 무지부와 결합되는 탭 결합부 및 상기 탭 결합부로부터 연장되어 상기 배터리 하우징의 내면 상에 전기적으로 결합되는 하우징 결합부를 포함하는 집전체; 및상기 개방부를 커버하는 캡;를 포함하는 배터리.
- 제1항에 있어서,상기 배터리 하우징은,상기 개방부에 인접한 단부에 형성되며 내측을 향해 압입된 비딩부를 구비하는 것을 특징으로 하는 배터리.
- 제2항에 있어서,상기 배터리 하우징은,상기 비딩부보다 상기 개방부를 향하는 측에 형성되며 상기 개방부를 향해 연장 및 절곡된 크림핑부를 구비하는 것을 특징으로 하는 배터리.
- 제3항에 있어서,상기 하우징 결합부는,상기 크림핑부에 의해 압착 고정되는 것을 특징으로 하는 배터리.
- 제2항에 있어서,상기 하우징 결합부는,상기 배터리 하우징의 비딩부 상에 결합되는 접촉부; 및상기 탭 결합부와 상기 접촉부 사이를 연결하는 연결부;를 포함하는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 연결부는,상기 접촉부의 일 단부와 상기 탭 결합부의 일 단부를 연결한 가상의 직선을 기준으로 상방으로 볼록한 구조를 갖는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 연결부는,상기 비딩부보다 상방으로 융기된 구조를 갖는 것을 특징으로 하는 배터리.
- 제6항에 있어서,상기 연결부는,적어도 하나의 절곡부를 구비하는 것을 특징으로 하는 배터리.
- 제8항에 있어서,상기 절곡부는,상기 접촉부의 일 단부와 상기 탭 결합부의 일 단부를 연결한 가상의 직선의 중심을 지나며 배터리 하우징의 바닥면과 평행한 가상의 평면보다 상방에 위치하는 것을 특징으로 하는 배터리.
- 제8항에 있어서,상기 적어도 하나의 절곡부는,상기 배터리 하우징의 길이 방향 축을 따라 보았을 때, 서로 겹치지 않도록,둔각으로 절곡되어 있는 것을 특징으로 하는 배터리.
- 제8항에 있어서,상기 접촉부와 상기 연결부의 경계 지점은,둔각으로 절곡되어 있는 것을 특징으로 하는 배터리.
- 제10항에 있어서,상기 연결부는,상기 연결부가 상기 비딩부를 향해 갈수록, 그 경사가 단계적 또는 점진적으로 감소하는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 탭 결합부와 상기 연결부 사이의 각도는,0 ~ 90 도 사이인 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 연결부는, 상기 캡를 지지하는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 탭 결합부와 상기 접촉부는,동일 높이에 위치하는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부는,상기 개방부 측을 향하는 상기 비딩부의 상면과 결합되는 평탄면을 구비하는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 비딩부는,압입되어 내입된 최 내측 지점을 중심으로 상방에 위치한 비딩부 상면; 및압입되어 내입된 최 내측 지점을 중심으로 하방에 위치한 비딩부 하면;을 포함하는 것을 특징으로 하는 배터리.
- 제17항에 있어서,상기 집전체의 적어도 하나의 탭 결합부는,상기 비딩부 하면보다 더 하측에 위치하는 것을 특징으로 하는 배터리.
- 제17항에 있어서,상기 비딩부 상면 및 상기 비딩부 하면 중 적어도 어느 하나는,상기 배터리 하우징의 하면과 소정 각도를 이루며 경사진 것을 특징으로 하는 배터리.
- 제19항에 있어서,상기 접촉부는,상기 비딩부의 경사진 상면 상에 안착되는 것을 특징으로 하는 배터리.
- 제17항에 있어서,상기 비딩부 상면 및 상기 비딩부 하면 중 적어도 어느 하나는,적어도 일부 영역에서 상기 배터리 하우징의 하면과 평행한 것을 특징으로 하는 배터리.
- 제17항에 있어서,상기 비딩부 상면 및 상기 비딩부 하면은,상기 비딩부의 최 내측 지점을 배터리 하우징의 바닥면과 평행하게 통과하는 가상의 기준 평면을 기준으로 비대칭인 것을 특징으로 하는 배터리.
- 제21항에 있어서,상기 접촉부는,상기 비딩부의 평탄한 상면 상에 안착되는 것을 특징으로 하는 배터리.
- 제2항에 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 배터리 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 배터리.
- 제2항에 있어서,상기 비딩부의 압입 깊이는,0.2 ~ 10 mm 인 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 비딩부의 압입 깊이를 PD라고 하고, 상기 압입 깊이의 최대 값을 PDmax라고 하고,상기 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 배터리 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 배터리.
- 제5항에 있어서,상기 접촉부는,상기 비딩부 상에 용접 결합되는 것을 특징으로 하는 배터리.
- 제21항에 있어서,상기 접촉부는,상기 비딩부의 평탄한 상면 상에 용접 결합되는 것을 특징으로 하는 배터리.
- 제28항에 있어서,상기 접촉부와 상기 비딩부 사이의 용접 영역은,상기 비딩부의 평탄한 상면보다 좁게 형성되어 있는 것을 특징으로 하는 배터리.
- 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 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 배터리.
- 제28항에 있어서,상기 비딩부와 상기 접촉부 사이에 형성되는 용접 비드는 적어도 하나 이상이고,상기 적어도 하나의 용접 비드는, 원주 방향을 따라 연장되는 직선 형상의 용접 패턴을 형성하는 것을 특징으로 하는 배터리.
- 제28항에 있어서,상기 비딩부와 상기 접촉부 사이에 형성되는 용접 비드는 적어도 하나 이상이고,상기 적어도 하나의 용접 비드는, 원주 방향을 따라 연장되는 호 형상의 용접 패턴을 형성하는 것을 특징으로 하는 배터리.
- 제28항에 있어서,상기 비딩부와 상기 접촉부 사이에 형성되는 용접 비드는, 용접 패턴을 형성하고,상기 용접 패턴은 점 용접이 연결된 선 형태를 갖는 것을 특징으로 하는 배터리.
- 제28항에 있어서,상기 비딩부와 상기 접촉부 사이에 형성되는 용접 비드는,동일 접촉부 내에 복수 개 형성되는 것을 특징으로 하는 배터리.
- 제28항에 있어서,상기 비딩부와 상기 접촉부 사이에 형성되는 용접 비드의 폭은,0.1 mm 이상인 것을 특징으로 하는 배터리.
- 제31항에 있어서,상기 제1 무지부와 상기 탭 결합부는 상기 전극 조립체의 반경 방향을 따라용접 결합되는 것을 특징으로 하는 배터리.
- 제1항에 있어서,상기 탭 결합부는,상기 배터리 하우징의 하면과 평행한 상태로 상기 제1 무지부에 용접 결합되는 것을 특징으로 하는 배터리.
- 제36항에 있어서,상기 제1 무지부와 상기 탭 결합부 사이에 형성되는 복수의 용접 비드는,상기 전극 조립체의 반경 방향을 따라 연장된 직선 형상의 용접 패턴을 형성하는 것을 특징으로 하는 배터리.
- 제 36항에 있어서,상기 제1 무지부와 상기 탭 결합부 사이에 형성되는 용접 비드는, 용접 패턴을 형성하고,상기 용접 패턴은, 점 용접이 연결된 선 형태를 갖는 것을 특징으로 하는 배터리.
- 제36항에 있어서,상기 제1 무지부와 상기 탭 결합부 사이에 형성되는 용접 비드의 폭은,0.1 mm 이상인 것을 특징으로 하는 배터리.
- 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 절곡되어 절곡면을 형성하는 것을 특징으로 하는 배터리.
- 제41항에 있어서,상기 복수의 분절편은,상기 전극 조립체의 반경 방향을 따라 여러 겹으로 중첩되면서 절곡면을 형성하고,상기 절곡면은, 싱기 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 배터리.
- 제42항에 있어서,상기 탭 결합부는,상기 적층수 균일구간과 중첩되도록 상기 절곡면에 결합되는 것을 특징으로 하는 배터리.
- 제43항에 있어서,상기 적층수 균일구간의 중첩 레이어 수는 10 이상인 것을 특징으로 하는 배터리.
- 제44항에 있어서,상기 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 배터리.
- 제1항에 있어서,상기 집전체는,상기 집전체의 중심부에 원형의 집전체 홀을 구비하는 것을 특징으로 하는 배터리.
- 제46항에 있어서,상기 집전체 홀의 직경은,상기 전극 조립체의 코어에 구비된 권취 중심 홀의 직경보다 크거나 같은 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 배터리는,상기 배터리 하우징과 상기 캡 사이에 구비된 실링 가스켓을 포함하는 것을 특징으로 하는 배터리.
- 제48항에 있어서,상기 접촉부는,상기 실링 가스켓과 상기 비딩부 사이에 개재되는 것을 특징으로 하는 배터리.
- 제48항에 있어서,상기 실링 가스켓의 두께는,원주 방향을 따라 가변하는 것을 특징으로 하는 배터리.
- 제48항에 있어서,상기 실링 가스켓의 두께는,원주 방향을 따라 증가와 감소를 교차로 반복하는 것을 특징으로 하는 배터리.
- 제50항에 있어서,상기 실링 가스켓은,상기 접촉부와 접촉하는 영역과, 상기 접촉부와 접촉하지 않는 영역에서 압축률이 동일한 것을 특징으로 하는 배터리.
- 제50항에 있어서,상기 실링 가스켓은,상기 접촉부와 접촉하는 영역보다, 상기 접촉부와 접촉하지 않는 영역에서 더 작은 압축률을 갖는 것을 특징으로 하는 배터리.
- 제48항에 있어서,상기 실링 가스켓은,상기 접촉부와 접촉하는 영역보다, 상기 접촉부와 접촉하지 않는 영역에서 더 큰 두께를 갖는 것을 특징으로 하는 배터리.
- 제1항에 있어서,집전체는,상기 탭 결합부와 상기 하우징 결합부가 상호 연결된 상태로 반경 방향을 따라 연장된 레그 구조를 갖는 것을 특징으로 하는 배터리.
- 제55항에 있어서,상기 레그 구조는 복수 개 구비되는 것을 특징으로 하는 배터리.
- 제55항에 있어서,상기 레그 구조는,상기 집전체의 중심부를 기준으로 방사형, 십자형 또는 이들이 조합된 형태로 배치되는 것을 특징으로 하는 배터리.
- 제56항에 있어서,상기 하우징 결합부가 복수 개 구비되고,복수의 상기 하우징 결합부는, 상호 연결되어 일체로 형성된 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 연결부는,연장 방향이 적어도 1회 전환되는 밴딩부를 적어도 하나 구비하는 것을 특징으로 하는 배터리.
- 제59항에 있어서,상기 밴딩부의 돌출된 최 외측 지점은,상기 비딩부의 최 내측 지점과 소정 간격 이격되어 있는 것을 특징으로 하는 배터리.
- 제59항에 있어서,상기 밴딩부에 의해,상기 접촉부와 상기 연결부 사이의 각도가 예각이 되는 것을 특징으로 하는 배터리.
- 제59항에 있어서,상기 연결부는,상기 밴딩부에 의해 상방으로 탄성 바이어스 되어 있는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부의 원주 방향 길이는,상기 탭 결합부의 원주 방향 길이와 동일한 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부의 원주 방향 길이는,상기 연결부의 원주 방향 길이와 동일한 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부의 원주 방향 길이는,상기 탭 결합부의 원주 방향 길이에 비해 상대적으로 긴 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부의 원주 방향 길이는,상기 연결부의 원주 방향 길이에 비해 상대적으로 긴 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부는,상기 배터리 하우징의 비딩부를 따라 원주 방향으로 연장되는 호 형태를 갖는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부는,상기 연결부와 상기 접촉부의 교차 지점으로부터, 원주 방향을 따라 서로 반대 방향으로 연장되는 호 형태를 갖는 것을 특징으로 하는 배터리.
- 제67항에 있어서,원주 방향으로 연장된 상기 접촉부의 길이의 합은,상기 배터리 하우징의 내주의 길이와 대응되는 것을 특징으로 하는 배터리.
- 제67항에 있어서,상기 연결부는,상기 접촉부를 따라 원주 방향으로 연장된 호 형태를 갖는 것을 특징으로 하는 배터리.
- 제2항에 있어서,상기 탭 결합부와 상기 하우징 결합부의 경계 영역은,상기 하우징 결합부의 단부가 상기 비딩부를 향하도록 절곡되어 있는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부와 상기 연결부 사이의 연결 부위는,절곡되어 있는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부와 상기 연결부 사이의 연결 부위는,상기 비딩부의 내측 표면과 대응되는 상보적 형상을 갖는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부와 상기 연결부 사이의 연결 부위는,상기 비딩부의 내측 표면과 정합되는 형상을 가진 채로 상기 비딩부와 결합되는 것을 특징으로 하는 배터리.
- 제1항에 있어서,상기 탭 결합부와 상기 하우징 결합부의 경계 영역은,상기 배터리 하우징에 형성된 비딩부의 최 내측 지점보다 더 내측에 위치하는 것을 특징으로 하는 배터리.
- 제2항에 있어서,상기 배터리 하우징의 길이 방향 축을 따라 보았을 때,상기 탭 결합부는 상기 비딩부에 의해 중첩되지 않는 것을 특징으로 하는 배터리.
- 제1항에 있어서,상기 배터리는,상기 제2 전극은 장변 단부에 활물질층이 코팅되지 않으며 상기 분리막의 외부로 노출된 제2 무지부를 포함하며, 상기 제2 무지부의 적어도 일부는 그 자체로서 전극 탭으로서 사용되고,상기 개방부의 반대 편에 구비되며 상기 제2 무지부와 전기적으로 연결되는 단자;를 포함하는 것을 특징으로 하는 배터리.
- 제77항에 있어서,상기 제2 무지부와, 상기 단자 사이에 형성되어 있고,상기 제2 무지부와 결합되는 탭 결합부;및 상기 단자와 결합되는 단자 결합부;를 구비한 제2 집전체를 더 포함하는 것을 특징으로 하는 배터리.
- 제78항에 있어서,상기 단자 결합부는,상기 전극 조립체의 권취 중심 홀을 커버하는 것을 특징으로 하는 배터리.
- 제79항에 있어서,상기 제2 집전체의 상기 단자 결합부의 중심으로부터 상기 탭 결합부의 끝단에 이르는 최장 반경은,상기 집전체의 중심부로부터 상기 탭 결합부의 끝단에 이르는 최장 반경보다 큰 것을 특징으로 하는 배터리.
- 제78항에 있어서,상기 제2 집전체의 탭 결합부는,상기 제2 무지부의 절곡된 단부에 결합되어 있는 것을 특징으로 하는 배터리.
- 제81항에 있어서,상기 제2 집전체의 탭 결합부와, 상기 제2 무지부의 절곡된 단부를 결합하는 용접 영역이 더 형성되어 있고,상기 제2 집전체의 단자 결합부의 중심으로부터 상기 용접 영역에 이르는 거리는, 상기 집전체의 중심부로부터 탭 결합부 상의 용접 영역에 이르는 거리와 동일하거나, 5% 이하의 거리 편차를 갖는 것을 특징으로 하는 배터리.
- 제82항에 있어서,상기 제2 집전체의 용접 영역은,상기 집전체의 탭 결합부 상의 용접 영역보다 긴 길이를 갖는 것을 특징으로 하는 배터리.
- 제1항에 있어서,상기 탭 결합부 상에는 전해액 주입을 위한 하나 이상의 홀이 형성되어 있는 것을 특징으로 하는 배터리.
- 제1항에 있어서,상기 배터리의 직경을 높이로 나눈 폼 팩터의 비가 0.4 보다 큰 것을 특징으로 하는 배터리.
- 제1항에 있어서,양극과 음극 사이에서 측정된 저항이 4miliohm 이하인 것을 특징으로 하는 배터리.
- 제1항 내지 제86항 중 어느 한 항에 따른 배터리를 포함하는 배터리 팩.
- 제87항에 있어서,복수의 배터리는 소정 수의 열로 배열되고,각 배터리의 단자와 배터리 하우징 바닥의 외부면은 상부를 향하도록 배치되는 것을 특징으로 하는 배터리 팩.
- 제88항에 있어서,복수의 배터리를 직렬 및 병렬로 연결하는 복수의 버스바를 포함하고,각 버스바는 인접하는 배터리의 상부에 배치되고,각 버스바는,인접하는 단자 사이에서 연장되는 바디부;상기 바디부의 일측으로 연장되어 상기 일측에 위치한 배터리의 전극 단자에 전기적으로 결합하는 복수의 제1버스바 단자; 및상기 바디부의 타측으로 연장되어 상기 타측에 위치한 배터리의 배터리 하우징 바닥의 외부면에 전기적으로 결합하는 복수의 제2버스바 단자를 포함하는 것을 특징으로 하는 배터리 팩.
- 제87항에 따른 배터리 팩을 포함하는 자동차.
- 전극 조립체의 제1 무지부와 결합되는 적어도 하나의 탭 결합부; 및상기 탭 결합부로부터 연장되어 배터리 하우징의 비딩부 상에 전기적으로 결합되는 적어도 하나의 하우징 결합부를 포함하는 것을 특징으로 하는 집전체.
- 쉬트 형상을 가진 제1 전극 및 제2 전극과 이들 사이에 개재된 분리막이 일 방향으로 권취된 구조를 가진 전극 조립체로서, 상기 제1 전극은 장변 단부에 활물질층이 코팅되지 않으며 상기 분리막의 외부로 노출된 제1 무지부를 포함하고, 상기 제1 무지부의 적어도 일부는 그 자체로서 전극 탭으로서 사용되는 전극 조립체;일 측에 형성된 개방부를 통해 상기 전극 조립체를 수용하는 배터리 하우징;상기 제1 무지부 및 상기 배터리 하우징의 내면과 전기적으로 결합되는 집전체; 및상기 배터리 하우징의 개방부와 상기 집전체 사이에 개재된 실링 가스켓;을 포함하고,상기 집전체가 상기 배터리 하우징의 내면에 접하는 부분이, 상기 배터리 하우징의 내면과 상기 실링 가스켓 사이에 개재된 것을 특징으로 하는 배터리.
- 제92항에 있어서,상기 배터리 하우징은,상기 개방부에 인접한 단부에 형성되며 내측을 향해 압입된 비딩부를 구비하는 것을 특징으로 하는 배터리.
- 제38항에 있어서,상기 제1 무지부와 상기 탭 결합부 사이에 형성되는 용접 패턴의 연장 방향과,상기 비딩부와 상기 접촉부 사이에 형성되는 용접 패턴의 연장 방향은,서로 수직인 것을 특징으로 하는 배터리.
- 제3항에 있어서,상기 비딩부의 최 내측 지점은,상기 크림핑부의 말단 지점보다,반경 방향으로 더 내측에 위치하는 것을 특징으로 하는 배터리.
- 제48항에 있어서,상기 실링 가스켓은 상기 캡를 감싸며,상기 실링 가스켓의 부위 중에서 상기 캡의 하면을 커버하는 부위의 반경 방향 길이는, 상기 실링 가스켓의 부위 중에서 상기 캡의 상면을 커버하는 부위의 반경 방향 길이보다 작은 것을 특징으로 하는 배터리.
- 제41항에 있어서,상기 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 배터리.
- 제30항에 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 배터리.
- 제30항에 있어서,상기 비딩부는 적어도 일부 영역에서 상기 배터리 하우징의 하면과 평행한 평탄 구간을 갖고,상기 집전체와 접촉하는 상기 비딩부의 상기 평탄 구간의 길이는,오버랩 길이가 OV이고,상기 비딩부의 곡률 반경이 R1일 때,OV - R1 인 것을 특징으로 하는 배터리.
- 제99항에 있어서,상기 비딩부와 상기 접촉부 사이에 형성되는 용접 패턴의 반경 방향 폭 길이는,Wbead,min 이상 OV - R1 이하인 것을 특징으로 하는 배터리.
- 제100항에 있어서,상기 평탄 구간 길이 대비 상기 용접 패턴의 반경 방향 폭 길이의 비율은,10 ~ 40 % 의 범위를 만족하는 것을 특징으로 하는 배터리.
- 제1항에 있어서,상기 전극 조립체의 외경을 지름으로 하는 원의 면적 대비 상기 집전체가 상기 전극 조립체의 상면과 접촉하지 않는 면적의 비율은,30% 이상 100 % 미만인 것을 특징으로 하는 배터리.
- 제1항에 있어서,상기 전극 조립체의 외경을 지름으로 하는 원의 면적 대비 상기 집전체가 상기 전극 조립체와 접촉하지 않는 면적의 비율은,60% 이상 100 % 미만인 것을 특징으로 하는 배터리.
- 제46항에 있어서,상기 집전체 홀의 직경은,상기 전극 조립체의 코어에 구비된 권취 중심 홀의 직경보다 작은 것을 특징으로 하는 배터리.
- 제104항에 있어서,상기 권취 중심 홀의 직경을 R3 이라고 할 때,상기 집전체 홀의 직경은 0.5*R3 이상 R3 미만인 것을 특징으로 하는 배터리.
- 제104항에 있어서,상기 권취 중심 홀의 직경을 R3이라고 할 때,상기 집전체 홀의 직경은 0.7*R3 이상 R3 미만인 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 연결부는 반경 방향 및 권취 축방향으로 연장되는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 탭 결합부, 연결부 및 접촉부는 연장 방향을 따라 동일한 폭을 갖는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 접촉부는 상기 연결부보다 큰 폭을 갖는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 연결부는 상기 탭 결합부보다 작은 폭을 갖는 것을 특징으로 하는 배터리.
- 제5항에 있어서,상기 연결부는 상기 탭 결합부보다 큰 폭을 갖는 것을 특징으로 하는 배터리.
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KR1020210137856A KR20220105112A (ko) | 2021-01-19 | 2021-10-15 | 원통형 이차전지, 그리고 이를 포함하는 배터리 팩 및 자동차 |
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KR1020210194593A KR20220105118A (ko) | 2021-01-19 | 2021-12-31 | 원통형 배터리 셀, 그리고 이를 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 |
PCT/KR2022/001009 WO2022158861A2 (ko) | 2021-01-19 | 2022-01-19 | 전지 및 이에 적용되는 집전체, 그리고 이러한 전지를 포함하는 배터리 팩 및 자동차 |
PCT/KR2022/001005 WO2022158857A2 (ko) | 2021-01-19 | 2022-01-19 | 전극 조립체, 배터리 및 이를 포함하는 배터리 팩 및 자동차 |
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PCT/KR2022/001012 WO2022158864A2 (ko) | 2021-01-19 | 2022-01-19 | 전극 단자의 고정 구조 및 이를 포함하는 배터리, 배터리 팩 및 자동차 |
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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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