WO2022177378A1 - 전극 조립체, 배터리 및 이를 포함하는 배터리 팩 및 자동차 - Google Patents
전극 조립체, 배터리 및 이를 포함하는 배터리 팩 및 자동차 Download PDFInfo
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- WO2022177378A1 WO2022177378A1 PCT/KR2022/002469 KR2022002469W WO2022177378A1 WO 2022177378 A1 WO2022177378 A1 WO 2022177378A1 KR 2022002469 W KR2022002469 W KR 2022002469W WO 2022177378 A1 WO2022177378 A1 WO 2022177378A1
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- electrode assembly
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- welding
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Images
Classifications
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
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- H01M50/50—Current conducting connections for cells or batteries
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- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- H01M50/50—Current conducting connections for cells or batteries
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- H01M50/564—Terminals characterised by their manufacturing process
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- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
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- 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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Definitions
- cylindrical, prismatic, and pouch-type batteries are known as types of unit secondary batteries.
- a separator which is an insulator, is interposed between the positive electrode and the negative electrode and wound to form an electrode assembly in the form of a jelly roll, which is inserted into the battery housing to configure the battery.
- a strip-shaped electrode tab may be connected to each of the uncoated regions of the positive electrode and the negative electrode, and the electrode tab electrically connects the electrode assembly and the externally exposed electrode terminal.
- the positive electrode terminal is a cap of a sealing body sealing the opening of the battery housing
- the negative electrode terminal is the battery housing.
- FIG. 1 to 4 are views showing a manufacturing process of a tab-less cylindrical battery.
- 1 shows the structure of the electrode
- FIG. 2 shows the winding process of the electrode
- FIG. 3 shows the process of bending the uncoated areas 32 and 33 using the forming jig 30, and
- FIG. 4 shows the uncoated area ( It is a view showing the state in which the current collectors 34 and 35 are welded to the bent surface area of the 32 and 33 .
- the uncoated area 32 of the positive electrode 10 and the uncoated area 33 of the negative electrode 11 are bent toward the core. After that, the plate-shaped current collectors 34 and 35 are welded to the uncoated regions 32 and 33, respectively, to be coupled thereto.
- a separate electrode tab is not coupled to the positive electrode uncoated region 32 and the negative electrode uncoated region 33 , and current collectors 34 and 35 are connected to external electrode terminals. Since the current path is formed with a large cross-sectional area along the winding axial direction (refer to the arrow) of the electrode assembly A, there is an advantage in that the resistance of the battery can be lowered. This is because resistance is inversely proportional to the cross-sectional area of the path through which the current flows.
- the uncoated regions 32 and 33 In order for the uncoated regions 32 and 33 to overlap uniformly along the radial direction of the electrode assembly A, the uncoated regions at the corresponding positions are bent toward the core with respect to the positions of each winding turn, and the uncoated regions bent in the inner winding turn should cover the top.
- the bending length of the uncoated region located in each winding turn is e
- the bending length e is d*n ( n is a natural number greater than or equal to 2) must have a length of at least 2 Only then is an area where the uncoated areas 32 and 33 overlap in multiple layers.
- the small cylindrical battery has a small diameter of 18 mm, 21 mm, etc.
- a bent surface area is formed by repeatedly tapping (32, 33).
- the present invention was devised under the background of the prior art as described above, and when the uncoated area exposed at both ends of the electrode assembly is bent, a region where the uncoated area is uniformly overlapped in multiple layers in the radial direction of the electrode assembly is secured to a sufficient length for welding output. It is an object of the present invention to provide an electrode assembly having an uncoated region bending structure that can prevent damage to a separator or an active material layer even when increasing the .
- Another technical object of the present invention is to provide a battery including an electrode assembly having an improved structure, a battery pack including the same, and a vehicle including the battery pack.
- An electrode assembly for achieving the above technical problem is an electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound around one axis to define a core and an outer circumferential surface. , wherein at least one of the first electrode and the second electrode includes an uncoated region exposed in the axial direction beyond the separator at a long side end along the winding direction, and at least a portion of the uncoated region in a radial direction of the electrode assembly defines a bent surface area having overlapping layers of the uncoated area by bending along can be extended to
- the uncoated region may have a thickness of 5 ⁇ m to 25 ⁇ m, and an uncoated region interval between adjacent winding turns may be 350 to 380 ⁇ m.
- the overlapping layers of the uncoated region may be stacked substantially perpendicular to the axial direction.
- the ratio of the radial length of the weld target region to the radius of the electrode assembly is 30% or more, optionally 40% or more, optionally 50% or more, optionally 60% or more, optionally 70% or more, or optionally 80% or more.
- the average number of overlapping layers of the uncoated region along the radial direction of the electrode assembly is 5 or more, optionally 6 or more, optionally 7 or more, optionally 8 or more, optionally 9 or more, or optionally It can be 10 or more.
- the average number of overlapping layers may be 5 or more and 15 or less.
- the welding target area may be disposed in a cross shape from the center of the electrode assembly to the outer side.
- a current collector may be welded to the welding target area.
- a welding pattern between the current collector and the welding target region may include a plurality of dot patterns arranged linearly in a radial direction of the genital electrode assembly.
- the maximum height of the uncoated area extending along the axial direction may be 12 mm.
- the electrode having the uncoated region may have a pair of short sides along the axial direction, and the pair of short sides may have the same length or different lengths.
- a battery according to another aspect of the present invention for achieving the above technical problem is an electrode assembly in which a first electrode and a second electrode and a separator interposed therebetween are wound around one axis to define a core and an outer circumferential surface, wherein the first Each of the electrode and the second electrode includes an uncoated region exposed in the axial direction beyond the separator at a long side end along the winding direction, and at least a portion of the uncoated region is bent along a radial direction of the electrode assembly.
- phosphorus, electrode assembly a battery housing in which the electrode assembly is accommodated, the battery housing having a first end and a second end having an opening; a sealing body sealing the opening at the first end of the battery housing; a terminal having a second end of the battery housing or a surface exposed to the outside through the sealing body; a first current collector electrically connected to a welding target region of the uncoated region of the first electrode and the terminal; and a second current collector electrically connected to the welding target region of the uncoated region of the second electrode and the battery housing.
- the terminal may be a rivet terminal disposed in a through hole at the second end of the battery housing, and a sealing gasket may be interposed between the through hole of the second end of the battery housing and the rivet terminal.
- the sealing body includes a cap crimped together with a sealing gasket at the opening of the first end of the battery housing, the sealing gasket being interposed between the cap and the opening of the first end of the battery housing.
- the cap may be insulated from the battery housing.
- At least a portion of an edge of the second current collector may be welded to an inner surface of the beading part.
- the cap may have no electrical polarity.
- An average stacking thickness of the overlapping layers of the uncoated region in the welding target region may be 25 ⁇ m or more.
- the first welding pattern and the second welding pattern may have the same length or different lengths in a radial direction of the electrode assembly.
- the first welding pattern may be longer than the second welding pattern.
- a bending depth of the uncoated region may be 1 mm to 5 mm.
- the first electrode and the second electrode may each include a pair of short sides along the axial direction, and the pair of short sides may have the same length or different lengths.
- Each of the first electrode and the second electrode may include a pair of long sides along the winding direction, and the pair of long sides may have the same length or different lengths.
- a ratio of a diameter to a height of the battery may be greater than 0.4.
- the technical problem may be achieved by a battery pack including the above-described battery, and a vehicle including the battery pack.
- a region where the uncoated area overlaps uniformly in the radial direction of the electrode assembly is sufficiently secured to increase the welding output, but damage to the separator or the active material layer is prevented.
- the electrolyte injection process and welding of the battery housing and the current collector can be carried out easily.
- a battery having a structure having a low internal resistance and improved welding strength between a current collector and an uncoated region, a battery pack including the same, and a vehicle.
- FIG. 2 is a view showing the electrode winding process of the conventional tab-less cylindrical battery.
- FIG. 3 is a diagram illustrating a process of bending an uncoated region in a conventional method for manufacturing a tab-less cylindrical battery.
- FIG. 4 is a diagram illustrating a state in which a current collector is welded to a bent surface area of an uncoated region in a conventional method for manufacturing a tab-less cylindrical battery.
- FIG. 5 is a plan view illustrating an electrode structure according to an embodiment of the present invention.
- FIG. 6 is a cross-sectional view of an electrode assembly according to an embodiment of the present invention taken in a winding axial direction (Y-axis).
- FIG. 7 is a view showing a state in which the uncoated portion exposed at the end of the electrode assembly is bent from the core to the outer side in the embodiment of the present invention.
- FIG. 9 is a view showing how the number of overlapping layers of the uncoated area varies according to the bending depth when the uncoated area exposed at the end of the electrode assembly according to the embodiment of the present invention is bent.
- FIG. 13A is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention taken along a winding axis (Y-axis) direction.
- FIG. 14A is a cross-sectional view of a cylindrical battery according to another embodiment of the present invention, taken along the winding axis (Y-axis) direction.
- FIG. 16 is a partially enlarged view of FIG. 15 .
- substantially identical may include deviations considered low in the art, for example, deviations within 5%.
- uniformity of a certain parameter in a region may mean that it is uniform in terms of an average in the region.
- 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.
- the electrode assembly is a jelly roll type 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.
- FIG. 5 is a plan view showing the structure of the electrode 40 according to the embodiment of the present invention.
- the electrode 40 includes a conductive substrate 40a made of a metal foil and an active material layer 40b.
- the electrode 40 has a pair of short sides and a pair of long sides extending between the pair of short sides.
- the pair of short sides extend along the winding axis direction (Y), and the pair of long sides extend along the winding direction (X).
- the pair of short sides may have the same length or different lengths, and the pair of long sides may also have the same length or different lengths.
- the insulating coating layer 40d may include a polymer resin and may include an inorganic filter such as Al 2 O 3 .
- the polymer resin may have a porous structure.
- the insulating coating layer 40d may have a width of 0.3 mm to 5 mm in the winding axis (Y) direction. Since the portion of the uncoated area 40c on which the insulating coating layer 40d is formed is an area where the active material is not coated, the portion may also be regarded as the uncoated area.
- a portion of the uncoated region 40c adjacent to the core may be cut through a notching process.
- the core of the electrode assembly is not blocked by the bent portion of the uncoated region 40c.
- the core is provided with a cavity formed when the bobbin used for winding the electrode assembly is removed.
- the cavity may be utilized as an electrolyte injection passage or a passage for inserting a welding jig.
- a dotted line indicates a position where the uncoated region 40c is bent. The bent position of the uncoated region 40c may be changed.
- the cutting portion B of the uncoated region 40c forms a plurality of winding turns in a radial direction when the electrode 40 is wound.
- the plurality of winding turns have a predetermined width in the radial direction.
- the width d of the cutting portion B and the bending length h of the uncoated region 40c may be adjusted so that the predetermined width is equal to or greater than the bending length h of the uncoated region 40c. . Then, even if the uncoated region 40c is bent, the core of the electrode assembly is not blocked by the bent portion of the uncoated region 40c.
- the width d of the cutting part B and the bending length h of the uncoated part 40c may be adjusted so that the core (cavity) of the electrode assembly is open to the outside by 90% or more based on its diameter.
- the gap may be preferably 0.2 mm to 4 mm, more preferably 0.5 mm to 2 mm.
- the cutting line of the cutting portion (B) is preferably 0.5mm to 4mm apart from the end of the active material layer (40b).
- the width d of the uncoated area cutting portion B is the electrode assembly It can be set to 180mm to 350mm depending on the diameter of the core.
- the cutting part B of the uncoated part 40c may not be formed.
- the cutting portion B of the uncoated region 40c may be formed on the outer periphery of the electrode 40 .
- the portion of the uncoated region 40c on the outer periphery of the electrode 40 may be prevented from making electrical contact with the battery housing. can This effect is useful when the polarity of the electrode 40 and the polarity of the battery housing are different from each other.
- the electrode 40 of the above-described embodiment may be applied to the first electrode and/or the second electrode having different polarities included in the jelly roll type electrode assembly.
- the conventional electrode structure FIG. 1
- electrode structures applied to the first electrode and the second electrode are not identical to each other and may be different.
- the positive active material coated on the positive electrode and the negative active material coated on the negative electrode 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, containing at least one element selected from Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; 0 ⁇ x, 1 ⁇ x+y ⁇ 2, - 0.1 ⁇ z ⁇ 2; stoichiometric coefficients x, y and z are selected such that the compound remains electrically neutral).
- A includes at least one element of Li, Na, and K
- M is Ni, Co, Mn, Ca, Mg, Al, containing at least one element selected from Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr
- the positive active material is an alkali metal compound xLiM 1 O 2 -(1-x)Li 2 M 2 O 3 (M 1 is at least one element having an average oxidation state 3) disclosed in US6,677,082, US6,680,143, etc. contains; M 2 contains at least one element having an average oxidation state 4; 0 ⁇ x ⁇ 1).
- the positive active material has the general formula Li a M 1 x Fe 1-x M 2 y P 1-y M 3 z O 4-z
- M 1 is Ti, Si, Mn, Co, Fe, V, At least one element selected from Cr, Mo, Ni, Nd, Al, Mg and Al
- M 2 is Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al , As, Sb, Si, Ge, 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 selected 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
- 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 separator 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 1-x La x Zr 1-y Ti y O 3 (PLZT), PB(Mg 3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT), BaTiO 3 , hafnia(HfO 2 ), SrTiO 3 , TiO 2 , Al 2 O 3 , ZrO 2 , SnO 2 , CeO 2 , MgO, CaO, ZnO and Y 2 O 3 as It may include at least one material selected from the group consisting of.
- FIG. 6 is a cross-sectional view taken along the Y axis of a jelly roll type electrode assembly 50 in which the electrode 40 according to an embodiment of the present invention is applied to the first electrode (anode) and the second electrode (cathode).
- the electrode assembly 50 may be manufactured by the winding method described with reference to FIG. 2 .
- the uncoated region 41 protruding upward of the electrode assembly 50 extends from the first electrode 43 .
- the uncoated region 42 protruding downward of the electrode assembly 50 extends from the second electrode 44 .
- the separator 45 is interposed between the first electrode 43 and the second electrode 44 .
- the length of the active material coating region of the first electrode 43 in the Y-axis direction may be smaller than the length of the active material coating region of the second electrode 44 in the Y-axis direction. Accordingly, the active material coating region of the second electrode 44 may extend longer in the Y-axis direction than the active material coating region of the first electrode 43 .
- the insulating coating layer 47 formed at the boundary between the uncoated region and the active material region of the first electrode 43 and the second electrode 44 may extend to the end of the separator 45 or may be exposed from the end to the outside. .
- the insulating coating layer 47 may serve to support the bending point when the uncoated regions 41 and 42 are bent. When the bending point is supported, the stress not applied to the active material layer and the separator 45 is relieved when the uncoated regions 41 and 42 are bent.
- the insulating coating layer 47 may prevent the first electrode 43 and the second electrode 44 from contacting each other and causing a short circuit.
- the end of the insulating coating layer 47 may be exposed with a length of greater than 0 and less than or equal to 2 mm along the winding axis Y direction beyond the end of the separator 45 .
- the first electrode 43 includes a conductive substrate and an active material coating layer formed on at least one surface thereof.
- the conductive substrate (the uncoated portion 41) may be made of aluminum and may have a thickness of 10 ⁇ m to 25 ⁇ m.
- the thickness of the first electrode 43 including the active material coating layer may be 180um to 220um.
- the second electrode 44 includes a conductive substrate and an active material coating layer formed on at least one surface thereof.
- the conductive substrate (the uncoated portion 42) may be made of copper and may have a thickness of 5 ⁇ m to 20 ⁇ m.
- the thickness of the second electrode 44 including the active material coating layer may be 140 ⁇ m to 180 ⁇ m.
- the separator 45 is interposed between the first electrode 43 and the second electrode 44 , and may have a thickness of 8 ⁇ m to 18 ⁇ m.
- the interval between the uncoated regions 41 positioned at the winding turns adjacent in the radial direction may be 350 ⁇ m to 380 ⁇ m.
- the interval between the uncoated regions 42 positioned at the winding turns adjacent in the radial direction may be 350 ⁇ m to 380 ⁇ m.
- the number of turns of the first electrode 43 may be 48 to 56 depending on the form factor of the cylindrical battery.
- the number of turns of the second electrode 44 also varies depending on the form factor of the cylindrical battery, and may be 48 to 56.
- the uncoated regions 41 and 42 are longer than the uncoated regions applied to the design of a small cylindrical battery.
- the uncoated areas 41 and 42 may be 6 mm or more, optionally 7 mm or more, optionally 8 mm or more, optionally 9 mm or more, optionally 10 mm or more, optionally 11 mm or more, optionally 12 mm or more.
- the uncoated regions 41 and 42 may be bent in the radial direction of the electrode assembly 50 , more preferably, from the outer shell toward the core.
- FIG. 7 is a cross-sectional view illustrating a state in which the uncoated portion 41 of the electrode assembly 50 is bent from the core to the outer side using the forming jig 60 .
- 8 is a cross-sectional view illustrating a state in which the uncoated portion 41 of the electrode assembly 50 is bent from the outer shell toward the core using the forming jig 60 .
- the material of the uncoated region 41 is aluminum
- the thickness is 10 ⁇ m
- the length in the winding axial direction is 8 mm
- the bending depth is set to 2 mm.
- the bending depth corresponds to a height difference between before and after bending of the uncoated region 41 .
- the height after the uncoated region 41 is bent is the height of the bent surface area.
- the reference point of the height may be a boundary point between the active material coating layer and the uncoated region 41 .
- the distortion of the uncoated area 41 is caused by the inversion of the radius of curvature as the uncoated area 41 is bent. 7 and 8 , the uncoated region 41 is preferably bent from the outer shell of the electrode assembly 50 toward the core. Similarly, the uncoated region 42 is also preferably bent from the outer shell of the electrode assembly 50 toward the core.
- the distortion of the uncoated regions 41 and 42 occurs near the core of the electrode assembly 50 . If the uncoated areas 41 and 42 near the core are not bent by forming a cutting portion (B of FIG. 5 ) to form the uncoated areas near the core, distortion of the uncoated areas 41 and 42 can be prevented.
- the uncoated portions 41 and 42 are bent from the outer shell of the electrode assembly 50 toward the core. It is also possible
- the bending depth of the uncoated regions 41 and 42 is at least 1 mm or more, optionally 1.5 mm or more, optionally 2 mm or more, optionally 2.5 mm or more, optionally 3.0 mm or more, optionally 3.5 mm or more, optionally 4 mm or more. or more, optionally 4.5 or more, optionally 5.0 mm or more.
- the number of overlapping layers of the uncoated area 41 in the center of the radius of the electrode assembly 50 (area indicated by vertical dotted lines) is three. .
- the number of overlapping layers of the uncoated area 41 at the center of the radius of the electrode assembly 50 is six.
- the number of overlapping layers of the uncoated area 41 in the center of the electrode assembly 50 is nine.
- the number of overlapping layers of the uncoated region according to the bending depth of the three conditions is approximately three times the bending depth. Accordingly, it is apparent to those skilled in the art that when the bending depth of the uncoated region 41 is greater than 3 mm, the number of overlapping layers of the uncoated region 41 in the radial center of the electrode assembly 50 will be greater than nine.
- FIG. 10 is a photograph of an upper portion of an electrode collector and a cross-section of a welding point taken with an optical microscope when the collector is laser-welded after bending the uncoated area while varying the number of overlapping layers in the uncoated area.
- the left photo is after the bending process
- the right photo is after welding the current collector.
- the photo on the left is at 80 magnification
- the photo on the right is at 120 magnification.
- the uncoated area was bent from the outer shell toward the core.
- Comparative Examples 1 and 2 the uncoated area was bent from the core to the outer side.
- Example 1 When bending the uncoated region from the outer shell of the electrode assembly toward the core, the bending depths for the uncoated region on the positive side and the uncoated region on the negative side were set to 3 mm and 3 mm, respectively.
- the material, length, and thickness of the anode uncoated region are aluminum, 8 mm and 10 ⁇ m, respectively, and the material, length, and thickness of the anode uncoated region are copper, 8 mm and 15 ⁇ m, respectively.
- the average number of overlapping layers was determined by setting measurement points at intervals of 1 mm in the welding section, and obtaining the average of the number of overlapping layers checked at each measurement point.
- the overlapping surfaces of the uncoated regions may be substantially perpendicular to the winding axis direction.
- the number of overlapping layers means the number of overlapping layers of the uncoated area through which the virtual line passes when a virtual line parallel to the winding direction is drawn at the measurement point.
- Comparative Examples 1 and 2 since the number of overlapping layers of the uncoated area is small, when the output of the laser is increased to increase welding strength, the laser may pass through the overlapping area of the uncoated area and penetrate into the electrode assembly. Therefore, there is a limit in increasing the strength of the weld zone to a desired level.
- Cylindrical batteries with a form factor of 4680 are mounted in automobiles and the like. When the vehicle is operated, vibration is continuously applied to the cylindrical battery, and as the period of use of the cylindrical battery increases, a swelling phenomenon occurs. Problems such as this may occur. Comparative Examples 1 and 2 are vulnerable to this problem.
- Examples 1 and 2 the average of the average number of overlapping layers of the positive electrode uncoated area and the negative electrode uncoated area calculated within the welding section of the current collector was 5 and 7 sheets, respectively, and the empty space (gap) between the uncoated areas ) was significantly reduced. Therefore, Examples 1 and 2 have excellent welding strength, excellent vibration resistance, and excellent laser masking effect, compared to Comparative Examples 1 and 2.
- the bent surface area formed by bending the uncoated area from the outer shell of the electrode assembly to the core side is substantially flat, and the average number of overlapping layers of the uncoated area is 5 or more, optionally 6 or more, optionally 7 or more sheets, optionally 8 sheets or more, optionally 9 sheets or more, optionally 10 sheets or more may include a welding target area.
- the bent surface region may include a welding target region in which the number of overlapping layers of the uncoated region is 5 or more and 15 or less.
- the average number of overlapping layers may be determined to a desired value by adjusting the length and bending depth of the uncoated area based on the spacing of the uncoated area protruding from the adjacent winding turns in the radial direction of the electrode assembly.
- the bent portions of the uncoated areas extending from the bending point toward the core have a length of about 3 mm.
- the optimal average number of overlapping layers is adaptively determined by trial and error in consideration of the laser power used for welding, the material and thickness of the uncoated area, and the uncoated area spacing between adjacent winding turns. can decide
- an area where the average number of overlapping layers of the uncoated area is 5 or more may be defined as a welding target area to which the current collector is welded.
- the weld target area extends along a radial direction of the electrode assembly 50 .
- the welding target region includes overlapping layers of the uncoated region.
- the overlapping means that the uncoated portion is stacked in multiple layers along the winding axis direction.
- the average stacking thickness of the overlapping layers of the uncoated area 42 in the welding target area may be 25 ⁇ m or more. This is because the thickness of the uncoated region 42 is preferably 5 ⁇ m to 20 ⁇ m.
- the upper limit of the average stacking thickness of the uncoated regions 41 and 42 in the weld target region may be determined by the upper limit of the average number of overlapping layers. That is, the upper limit of the average stacking thickness may be determined by a value obtained by multiplying the upper limit of the average number of overlapping layers and the maximum thickness of the uncoated regions 41 and 42 .
- the ratio of the length of the weld target region in which the number of overlapping layers is 5 or more is 30% or more, optionally 40% or more, optionally 50% based on the radius of the electrode assembly 50 . % or more, optionally 60% or more, optionally 70% or more, or optionally 80% or more.
- the ratio of the length of the welding target region in which the number of overlapping layers is 5 or more may be 30% or more and 90% or less based on the radius of the electrode assembly 50 .
- the welding target area is defined as a bent surface area formed while at least a portion of the uncoated area is bent in the radial direction of the electrode assembly.
- the weld target area may extend radially with respect to the core of the electrode assembly. Other portions of the uncoated region other than the welding target region may not be bent.
- the surface height of the weld target area is lower than its surroundings.
- the weld target region may have a groove structure extending radially from the center of the core of the electrode assembly toward the outer shell. In one example, the groove structure shown in FIG. 10 has a cross shape.
- the welding pattern formed in the welding target area may include a plurality of welding dots arranged along a radial direction of the electrode assembly.
- the welding dots may be radially arranged in at least one row or more, preferably in two rows or more.
- Weld dots correspond to weld beads produced by laser welding.
- a weld bead is a solidified metal melted by a laser.
- the shape of the current collector to be welded to the welding target area may correspond to the shape of the welding target area.
- a hole may be provided in the center of the current collector to communicate with a cavity in the core of the electrode assembly 50 .
- the region where the uncoated regions 41 and 42 of the electrode assembly 50 are to be bent may be cut to a predetermined depth in advance.
- the cutting depth may be between 1 mm and 5 mm.
- the position where the cutting is made is the boundary between the welding target area and the remaining area.
- 11 is a view showing a state in which the uncoated regions 41 and 42 are cut in advance.
- the concentric circles conceptually represent the uncoated areas 41 and 42, and in the case of the uncoated areas 41 and 42, they are actually wound in a spiral shape.
- a cutting line 70 is formed.
- the uncoated regions 41 and 42 may be cut up to the bending point.
- an ultrasonic cutting method or a laser cutting method may be applied.
- a method used for notching of the metal foil may be used without limitation.
- the photo on the left is the upper photo of the positive uncoated region and the photo on the right is the upper photo of the negative uncoated region.
- the CT image shown in the fourth column of the table is an image obtained by cutting the welding area of the uncoated area of the anode and taking a cross-section using a CT equipment.
- the cross-sectional photos in the fifth column of the table are photos taken with an optical microscope after cutting the weld area of the negative electrode uncoated region.
- Example 1 the uncoated region was bent from the core to the outer side without cutting the bent region, and the average number of overlapping layers in the weld region was three.
- Example 1 is substantially the same as Comparative Example 1 described above. In the area where the uncoated area overlaps, the uncoated area is irregularly deformed, and a large volume of empty space is identified in the overlapping area of the uncoated area.
- Example 2 the uncoated area was bent from the outer shell toward the core without cutting the bent area, and the average number of overlapping layers in the weld area was 6 sheets.
- the bending depth, material, length and thickness of the uncoated region are substantially the same as in Example 1.
- the degree of deformation of the uncoated region is not greater than that of Example 1, and the empty space (gap) is also relatively less than that of Example 1.
- Example 3 is a case in which the uncoated area is bent from the core to the outer side after cutting the bent area, and the average number of overlapping layers in the weld area is 5 sheets.
- the material and thickness of the uncoated area were the same as in Example 1, and the cutting depth of the uncoated area was 2 mm.
- the bent area was cut, it was confirmed that the uncoated area was irregularly deformed in the area where the uncoated area overlapped as the uncoated area was bent from the core to the outer side.
- the volume of the empty space (gap) in the overlapping region of the uncoated region was somewhat decreased.
- Example 4 the uncoated area was bent from the outer shell toward the core after cutting the bent area, and the average number of overlapping layers in the weld area was 6 sheets.
- the material and thickness of the uncoated area were the same as in Example 2, and the cutting depth of the uncoated area was 2 mm.
- the bent area is cut in advance, it can be seen that the uncoated area overlaps more uniformly than in Example 2 in the weld area, and the volume of the empty space (gap) is the smallest in the overlapping area of the uncoated area.
- Various electrode assembly structures according to an embodiment (modified example) of the present invention may be applied to a jelly roll type cylindrical battery.
- the cylindrical battery may be, for example, a cylindrical battery in which the ratio of the form factor (defined as the diameter of the cylindrical battery divided by the height, i.e. the ratio of the height H to the diameter ⁇ ) is greater than approximately 0.4. .
- the form factor means a value indicating the diameter and height of the cylindrical battery.
- the cylindrical battery according to an embodiment of the present invention may be, for example, a 46110 battery, a 4875 battery, a 48110 battery, a 4880 battery, or a 4680 battery.
- the first two numbers represent the diameter of the battery, and the remaining numbers represent the height of the battery.
- the uncoated area is easily torn due to a large stress applied in the radial direction when the uncoated area is bent.
- the number of overlapping layers in the uncoated region should be sufficiently increased. This requirement can be achieved by the electrode and the electrode assembly according to the embodiments (variations) of the present invention.
- the battery according to an embodiment of the present invention may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of 0.418.
- the battery according to another embodiment may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of 0.640.
- a battery according to another embodiment may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of 0.436.
- a battery according to another embodiment may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of 0.600.
- a battery according to another embodiment may be a cylindrical battery having a substantially cylindrical shape, a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of 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 0.277. For a 2170 battery, its diameter is approximately 21 mm, its height is approximately 70 mm, and the form factor ratio is 0.300.
- 13A is a cross-sectional view taken along the Y-axis direction of the cylindrical battery 190 according to an embodiment of the present invention.
- an electrode assembly 110 including a first electrode, a separator, and a second electrode, and the electrode assembly 110 are accommodated, and the upper and lower portions are provided. and a battery housing 142 having a first end and a second end, respectively, and a seal 143 sealing the opening of the battery housing 142 .
- the battery housing 142 is a cylindrical container having an opening at a first end and a closing portion (bottom) at a second end opposite to the first end.
- the battery housing 142 is made of a metal material having conductivity, such as aluminum or steel.
- the battery housing 142 accommodates the electrode assembly 110 in the inner space through the opening of the first end and also accommodates the electrolyte.
- 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
- 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 electrode assembly 110 may have a jelly roll shape, but the present invention is not limited thereto. As shown in FIG. 2, the electrode assembly 110 may be manufactured by winding a stack formed by sequentially stacking a lower separator, a first electrode, an upper separator, and a second electrode at least once based on a winding axis. have.
- the first electrode and the second electrode have different polarities. That is, if one has positive polarity, the other has negative polarity.
- At least one of the first electrode and the second electrode may have an electrode structure according to the above-described embodiments (modified examples).
- the other one of the first electrode and the second electrode may have a conventional electrode structure or an electrode structure according to embodiments (modified examples).
- An uncoated area 146a of the first electrode and an uncoated area 146b of the second electrode respectively protrude from an end of the separator to the upper and lower portions of the electrode assembly 110 .
- the sealing body 143 provides an airtightness between the plate-shaped cap 143a with a protruding center portion, the cap 143a and the battery housing 142, and is electrically connected to the insulating sealing gasket 143b and the cap 143a. and a mechanically coupled connection plate 143c.
- the cap 143a is a component made of a conductive metal material and covers the opening of the battery housing 142 .
- the cap 143a is electrically connected to the uncoated region 146a of the first electrode, and is electrically insulated from the battery housing 142 through a sealing gasket 143b. Accordingly, the cap 143a may function as a first electrode terminal of the cylindrical battery 190 .
- the cap 143a is seated on the beading portion 147 formed in the battery housing 142 , and is fixed by the crimping portion 148 .
- a sealing gasket 143b may be interposed between the cap 143a and the crimping portion 148 to secure airtightness of the battery housing 142 and to electrically insulate the battery housing 142 and the cap 143a.
- the cap 143a may include a protrusion 143d protruding upward from the center thereof.
- the battery housing 142 is electrically connected to the uncoated region 146b of the second electrode. Accordingly, the battery housing 142 has the same polarity as the second electrode. If the second electrode has a negative polarity, the battery housing 142 also has a negative polarity.
- the battery housing 142 has a beading part 147 and a crimping part 148 at the top.
- the beading portion 147 is formed by press-fitting the outer periphery of the battery housing 142 .
- the beading part 147 prevents the electrode assembly 110 accommodated in the battery housing 142 from escaping through the upper opening of the battery housing 142, and may function as a support part on which the sealing body 143 is seated. .
- the crimping portion 148 is formed on the beading portion 147 .
- the crimping part 148 has a shape bent inward of the battery housing 142 so as to surround the outer periphery of the cap 143a disposed on the beading part 147 and a portion of the upper surface of the cap 143a.
- the cylindrical battery 190 may further include a first current collector 144 and/or a second current collector 145 and/or an insulator 146 .
- 13B and 13C are top plan views illustrating the structures of the first current collector 144 and the second current collector 145, respectively.
- the first current collector 144 is coupled to the upper portion of the electrode assembly 110 .
- the first current collector 144 is made of a conductive metal material such as aluminum, copper, nickel, or the like, and is welded to a welding target region of a bent surface region formed by bending the uncoated region 146a of the first electrode.
- the weld target area may have a radial groove structure as shown in FIGS. 10 and 12 .
- the radial groove structure may extend outwardly from the center of the core of the electrode assembly 110 .
- the average number of overlapping layers of the uncoated area 146a may be 5 or more.
- the average stacking thickness of the overlapping layers of the uncoated region 146a may be 50 ⁇ m or more.
- the first current collector 144 may have a structure capable of being seated in the groove structure of the welding target area.
- the first current collector 144 may also be a cross-shaped plate.
- the first current collector 144 includes a support portion 144a, a plurality of leg portions 144b extending outwardly from the support portion 144a, and a support portion 144a extending outwardly between adjacent leg portions 144b.
- a lead part 149 may be included.
- the support part 144a is seated near the core of the electrode assembly 110 , and the plurality of leg parts 144b may be welded to the welding target region of the bent surface region while seated on the bent surface region.
- a hole H 1 is provided at the center of the support 144a.
- the electrolyte may be injected through the hole H 1 .
- the diameter of the hole H 1 is at least 0.5 times the diameter of the cavity in the core of the electrode assembly 110 . If the diameter of the hole (H 1 ) is smaller than the diameter of the cavity in the core, it is possible to prevent the electrode or the separator from escaping through the cavity of the core when a vent occurs in the cylindrical battery 190 . In addition, if the diameter of the hole (H 1 ) is equal to or greater than the diameter of the cavity in the core, the welding jig can be easily inserted in the process of welding the second current collector 145 to the bottom of the battery housing 142 and the electrolyte solution Injection can be performed smoothly.
- the lead part 149 may extend upwardly of the electrode assembly 110 and may be coupled to the connection plate 143c or may be directly coupled to the lower surface of the cap 143a.
- the connection plate 143c may be coupled to the lower surface of the cap 143a.
- the lead portion 149 and other components may be coupled through welding.
- the coupling between the bent surface area of the uncoated region 146a and the first current collector 144 may be performed, for example, by laser welding.
- Laser welding may be performed by partially melting the current collector base material.
- Laser welding can be replaced by resistance welding, ultrasonic welding, or the like.
- a plate-shaped second current collector 145 may be coupled to a lower surface of the electrode assembly 110 .
- the second current collector 145 is made of a metal material having conductivity, such as aluminum, copper, nickel, or the like.
- the support part 145a is seated near the core on the lower surface of the electrode assembly 110 .
- the plurality of leg portions 145b are welded to the welding target area of the bent surface area formed while the uncoated area 146b is bent.
- the connection part 145c may be welded on the inner bottom surface of the battery housing 142 .
- the diameter of the connection part 145c is larger than the diameter of the cavity in the core of the electrode assembly 110 .
- the bridge part 145d connects the inner surface of the hole H 2 and the outer surface of the connection part 145c.
- the bridge portion 145d functions to buffer vibration or stress when vibration or stress is applied to the second current collector 145 .
- the width or thickness of the bridge portion 145d may be partially reduced. Then, when the overcurrent flows through the bridge portion 145d, the bridge portion 145d melts and breaks, thereby blocking the overcurrent.
- the welding target area defined in the bent surface area of the lower surface of the electrode assembly 110 may have a radial groove structure as shown in FIGS. 10 and 12 .
- the radial groove structure may extend outwardly from the center of the core of the electrode assembly 110 .
- the average number of overlapping layers of the uncoated region 146b may be 5 or more.
- the average stacking thickness of the overlapping layers of the uncoated area 146a may be 25 ⁇ m or more.
- the welding pattern W 1 formed on the leg portion 144b of the first current collector plate 144 and the welding pattern formed on the leg portion 145b of the second collector plate 145 are formed.
- (W 2 ) may start from a point spaced apart substantially the same distance from the center of the core of the electrode assembly 110 and extend in the radial direction.
- the radial length of the welding pattern W 1 may be the same as or different from the radial length of the welding pattern W 2 .
- the welding patterns W 1 , W 2 may be continuous welding beads or an arrangement of discontinuous welding beads.
- the insulator 146 may cover the first current collector 144 .
- the insulator 146 may cover the first current collector 144 from the upper surface of the first current collector 144 , thereby preventing direct contact between the first current collector 144 and the inner circumferential surface of the battery housing 142 . .
- the insulator 146 includes a lead hole 151 so that the lead part 149 extending upwardly from the first current collector 144 can be withdrawn.
- the lead part 149 is drawn upward through the lead hole 151 and is coupled to the lower surface of the connection plate 143c or the lower surface of the cap 143a.
- the peripheral region of the insulator 146 may be interposed between the first current collector 144 and the beading portion 147 to fix the electrode assembly 110 and the combination of the first current collector 144 . Accordingly, in the assembly of the electrode assembly 110 and the first current collector 144 , the movement in the height direction of the battery 190 is restricted, so that the assembly stability of the cylindrical battery 190 may be improved.
- the insulator 146 may be made of an insulating polymer resin.
- the insulator 146 may be made of polyethylene, polypropylene, polyimide, or polybutylene terephthalate.
- the battery housing 142 may further include a venting part 152 formed on a lower surface thereof.
- the venting part 152 corresponds to a region having a thinner thickness compared to a peripheral region of the lower surface of the battery housing 142 .
- the venting part 152 is structurally weak compared to the surrounding area. Accordingly, when an abnormality occurs in the cylindrical battery 190 and the internal pressure increases to a certain level or more, the venting part 152 may rupture and the gas generated inside the battery housing 142 may be discharged to the outside.
- the venting part 152 may be formed continuously or discontinuously while drawing a circle on the lower surface of the battery housing 142 .
- the venting part 152 may be formed in a straight pattern or other pattern.
- 14A is a cross-sectional view taken along the Y-axis of the cylindrical battery 200 according to another embodiment of the present invention.
- the cylindrical battery 200 has substantially the same structure as the cylindrical battery 190 illustrated in FIG. 13A , and differs in that the structure except for the electrode assembly is changed.
- the cylindrical battery 200 includes a battery housing 171 through which a rivet-type terminal 172 is installed.
- the terminal 172 is installed in the through hole of the closing part (bottom part) at the second end of the battery housing 171 .
- the lower edge portion of the terminal 172 is riveted to the through hole of the battery housing 171 with the insulating first sealing gasket 173 interposed therebetween.
- the riveting may be accomplished by pressing the lower edge of the terminal 172 with a caulking jig to plastically deform the corresponding portion toward the bottom of the battery housing 171 .
- the terminal 172 is exposed to the outside in a direction opposite to the direction of gravity.
- the terminal 172 includes a terminal exposed portion 172a and a terminal insertion portion 172b.
- the terminal exposed portion 172a is exposed to the outside of the closed portion of the battery housing 171 .
- the terminal exposed portion 172a may be located approximately at the center of the closing portion of the battery housing 171 .
- the maximum diameter of the terminal exposed portion 172a may be larger than the maximum diameter of the through hole formed in the closing portion of the battery housing 171 .
- the terminal insertion part 172b may pass through an approximately central portion of the closing part of the battery housing 171 to be electrically connected to the uncoated part 146a of the first electrode.
- the terminal insertion part 172b may be riveted to the inner surface of the battery housing 171 .
- the lower edge portion of the terminal insertion portion 172b may have a curved shape toward the inner surface of the battery housing 171 .
- the maximum diameter of the lower end of the terminal insertion part 172b may be greater than the maximum diameter of the through hole formed in the closing part of the battery housing 171 .
- the bottom surface of the terminal insertion part 172b is substantially flat and may be welded to the first current collector 144' connected to the uncoated part 146a of the first electrode.
- the first current collector 144 ′ has substantially the same structure as the current collector 145 illustrated in FIG. 13C . That is, the first current collector 144 ′ includes a support portion 144a ′ including a hole H 3 , a plurality of leg portions 144b ′ extending in a radial direction from the support portion 144 ′, and a hole H 3 ) It may include a connecting portion 144c' provided on the inside and a bridge portion 144d' connecting the supporting portion 144a' and the connecting portion 144c'.
- the connecting portion 144c ′ of the first current collector 144 ′ may be welded to a flat lower end of the terminal insertion portion 172b of the terminal 172 .
- the plurality of leg portions 144b ′ may be welded to a welding target area defined in the bent surface area of the upper portion of the electrode assembly 110 .
- an insulator 174 made of an insulating material may be interposed between the first current collector 144 ′ and the inner surface of the battery housing 171 .
- the insulator 174 is in contact with the upper surface of the first current collector 144 ′ and the inner surface of the closing part of the battery housing 171 .
- the insulator 174 covers an upper portion of the first current collector 144 ′ and an upper edge portion of the electrode assembly 110 . Accordingly, it is possible to prevent the uncoated portion of the outer side of the electrode assembly 110 from being in contact with the inner surface of the battery housing 171 having a different polarity to cause a short circuit.
- the insulator 174 is made of an insulating polymer resin.
- the terminal insertion portion 172b of the terminal 172 may penetrate the insulator 174 and be welded to the first current collector 144 ′. To this end, a hole exposing the lower portion of the terminal insertion portion 172b is provided in the central portion of the insulator 174 . A diameter of the hole may be larger than a lower diameter of the terminal insertion part 172b.
- the first sealing gasket 173 is interposed between the battery housing 171 and the terminal 172 to prevent the battery housing 171 and the terminal 172 having opposite polarities from electrically contacting each other. Accordingly, the upper surface 175 of the battery housing 171 having a substantially flat shape may function as an electrode terminal of the cylindrical battery 200 .
- the first sealing gasket 173 includes a gasket exposed portion 173a and a gasket insertion portion 173b.
- the gasket exposed portion 173a is interposed between the terminal exposed portion 172a of the terminal 172 and the battery housing 171 .
- the gasket insertion part 173b is interposed between the terminal insertion part 172b of the terminal 172 and the battery housing 171 .
- the gasket insertion part 173b may be deformed together during riveting of the terminal insertion part 172b to be in close contact with the inner surface of the battery housing 171 .
- the first sealing gasket 173 may be made of, for example, an insulating polymer resin.
- the gasket exposed portion 173a of the first sealing gasket 173 may extend to cover an outer surface of the terminal exposed portion 172a of the terminal 172 .
- a short circuit occurs in the process of coupling an electrical connection component such as a bus bar to the upper surface and/or the terminal 172 of the battery housing 171 . it can be prevented
- the gasket exposed portion 173a may have an extended shape to cover a portion of the upper surface as well as the outer surface of the terminal exposed portion 172a.
- the first sealing gasket 173 When the first sealing gasket 173 is made of a polymer resin, the first sealing gasket 173 may be coupled to the battery housing 171 and the terminal 172 by thermal fusion. In this case, airtightness at the bonding interface between the first sealing gasket 173 and the terminal 172 and at the bonding interface between the first sealing gasket 173 and the battery housing 171 may be enhanced. On the other hand, in the case where the gasket exposed portion 173a of the first sealing gasket 173 extends to the upper surface of the terminal exposed portion 172a, the terminal 172 is inserted into the first sealing gasket 173 by insert injection. ) can be combined with
- the remaining area 175 of the upper surface of the battery housing 171 excluding the area occupied by the terminal 172 and the first sealing gasket 173 corresponds to an electrode terminal having a polarity opposite to that of the terminal 172 .
- 14C is a perspective view illustrating the structure of the second current collector 176 .
- the second current collector 176 is coupled to the lower portion of the electrode assembly 110 .
- the second current collector 176 is made of a conductive metal material such as aluminum, steel, copper, or nickel. At least a portion of the second current collector 176 may be coupled to a welding target region included in the bent surface region of the uncoated region 146b of the second electrode through welding.
- the second current collector 176 includes a support portion 176a and a plurality of leg portions 176b extending in a radial direction from the support portion 176a and welded to the welding target area.
- the support portion 176a includes a hole (H 4 ) in the center.
- the electrolyte may be injected through the hole H 4 .
- the diameter of the hole H 4 is at least 0.5 times the diameter of the cavity in the core of the electrode assembly 110 .
- the function of the hole H 4 is substantially the same as the function of the hole H 1 described above.
- the second current collector 176 may be electrically connected to the battery housing 171 .
- at least a portion of an edge portion of the second current collector 176 may be fixedly interposed between the inner surface of the battery housing 171 and the second sealing gasket 178b.
- the second current collector 176 includes a housing connection portion 176c.
- the housing connection part 176c includes a connection part 176c2 extending obliquely from the end of the leg part 176b toward the lower surface of the beading part 180 and a contact part 176c1 disposed on the lower surface of the beading part 180. do.
- the contact portion 176c1 may extend in an arc shape along the circumferential direction of the beading portion 180 in order to increase a contact area with the beading portion 180 .
- At least a portion of the edge portion of the second current collector 176 for example, the contact portion 176c1 is supported on the lower end surface of the beading portion 180 formed at the lower end of the battery housing 171 , and the beading portion 180 is welded. ) can be fixed. In a modified example, at least a portion of an edge portion of the second current collector 176 may be directly welded to the inner wall surface of the battery housing 171 .
- the welding target region included in the bent surface region of the second current collector 176 and the uncoated region 146b may be joined by welding, for example, laser welding. At this time, welding is performed in a region in which the average number of overlapping layers of the uncoated region 146b is 5 or more in the bent surface region of the uncoated region 146b or in a region in which the average stacking thickness of the uncoated region 146b is 25 ⁇ m or more.
- the welding pattern W 1 formed on the leg portion 144b' of the first current collector 144' and the welding pattern W 2 formed on the leg portion 176b of the second current collector 176 are It may start from a point spaced apart substantially the same distance from the center of the core of the electrode assembly 110 and extend in the radial direction.
- the radial length of the welding pattern W 1 may be the same as or different from the radial length of the welding pattern W 2 . In one example, the radial length of the welding pattern W 1 is longer than the radial length of the welding pattern W 2 .
- the second current collector 176 includes the connecting portion 176c2, so that the leg portion 176b of the second current collector 176 is shorter than the leg portion 144b' of the first current collector 144'.
- At least one welding pattern W 3 is also formed on the contact portion 176c1 of the second current collector 176 .
- the welding pattern W 3 may have a shape of a straight line or a circular arc.
- the welding patterns W 1 , W 2 , and W 3 may be continuous welding beads or an arrangement of discontinuous welding beads.
- the sealing body 178 sealing the opening at the first end of the battery housing 171 includes a cap 178a and a second sealing gasket 178b.
- the second sealing gasket 178b electrically separates the cap 178a and the battery housing 171 from each other.
- the crimping portion 181 fixes the edge of the cap 178a and the second sealing gasket 178b together.
- the cap 178a is provided with a vent portion 179 .
- the configuration of the vent part 179 is substantially the same as that of the above-described embodiment (modified example).
- the cap 178a is made of a conductive metal material.
- the second sealing gasket 178b is interposed between the cap 178a and the battery housing 171, the cap 178a does not have an electrical polarity.
- the sealing body 178 seals the open end of the lower portion of the battery housing 171 and functions to discharge gas when the internal pressure of the battery 200 increases by more than a threshold value.
- the terminal 172 electrically connected to the uncoated portion 146a of the first electrode is used as the first electrode terminal.
- a portion 175 excluding the terminal 172 has the same polarity as the first electrode terminal.
- This other second electrode terminal is used.
- the cylindrical battery 200 can lower the resistance at the bonding portion of the electrical connection component to a desirable level.
- the cavity 112 of the core of the electrode assembly 110 may be opened upward without being blocked.
- the first electrode and the second electrode may include an uncoated area cutting part (refer to B of FIG. 5 ) near the core. Design conditions for the width d of the uncoated area cut portion B and the bending length h of the uncoated area 146a and 146b have already been described above.
- the cavity 112 is not blocked, there is no difficulty in the electrolyte injection process, and the electrolyte injection efficiency is improved.
- the welding process between the second current collector 145 and the bottom of the battery housing 142 or the welding process between the first current collector 144' and the terminal 172 is performed. can proceed easily.
- Cylindrical battery 200 according to the embodiment of the present invention has an advantage that can perform electrical connection at the top.
- FIG. 15 is a top plan view showing a state in which a plurality of cylindrical batteries 200 are electrically connected
- FIG. 16 is a partially enlarged view of FIG. 15 .
- a plurality of cylindrical batteries 200 may be connected in series and in parallel at the top of the cylindrical battery 200 using a bus bar 210 .
- the number of cylindrical batteries 200 may be increased or decreased in consideration of the capacity of the battery pack.
- the terminal 172 may have a positive polarity and the flat surface 171a around the terminal 172 of the battery housing 171 may have a negative polarity.
- the reverse is also possible.
- the plurality of cylindrical batteries 200 may be arranged in a plurality of columns and rows. Columns are provided in a vertical direction in the drawing, and rows are provided in a left and right direction in the drawing.
- the cylindrical batteries 200 may be arranged in a closest packing structure. The tightest packing structure is formed when an equilateral triangle is formed when the centers of the terminals 172 exposed to the outside of the battery housing 171 are connected to each other.
- the bus bar 210 connects the cylindrical batteries 200 arranged in the same row in parallel to each other, and the cylindrical batteries 200 arranged in two adjacent rows are connected in series with each other.
- the bus bar 210 may include a body portion 211 , a plurality of first bus bar terminals 212 , and a plurality of second bus bar terminals 213 for serial and parallel connection.
- the body portion 211 may extend along rows of cylindrical batteries 200 between adjacent terminals 172 .
- the body part 211 may extend along a row of cylindrical batteries 200 , and the body part 211 may be regularly bent like a zigzag shape.
- the plurality of first bus bar terminals 212 may extend in one direction of the body portion 211 and may be electrically coupled to the terminals 172 of the cylindrical battery 200 located in one direction. Electrical coupling between the first bus bar terminal 212 and the terminal 172 may be performed by laser welding, ultrasonic welding, or the like.
- the plurality of second bus bar terminals 213 may extend from the other side direction of the body portion 211 and may be electrically coupled to the flat surface 171a around the terminal 172 located in the other side direction. Electrical coupling between the second bus bar terminal 213 and the flat surface 171a may be performed by laser welding, ultrasonic welding, or the like.
- the body portion 211, the plurality of first bus bar terminals 212 and the plurality of second bus bar terminals 213 may be formed of one conductive metal plate.
- the metal plate may be, for example, an aluminum plate or a copper plate, but the present invention is not limited thereto.
- the body portion 211 , the plurality of first bus bar terminals 212 , and the second bus bar terminals 213 may be manufactured as separate pieces and then coupled to each other through welding or the like.
- the above-described cylindrical battery 200 of the present invention has minimized resistance through expansion of the welding area through the bent surface area, multiplexing of current paths using the second current collector 176, and minimization of the length of the current path.
- the AC resistance of the cylindrical battery 200 measured through a resistance meter between the positive and negative poles, that is, between the terminal 172 and the flat surface 171a around it, is 0.5 milliohm to 4 milliohms suitable for fast charging.
- Ohm (m ⁇ ) preferably 1 milliohm (m ⁇ ) to 4 milliohm (m ⁇ ).
- Cylindrical battery 200 since the terminal 172 having a positive polarity and the flat surface 171a having a negative polarity are located in the same direction, the cylindrical battery 200 using the bus bar 210 It is possible to easily implement their electrical connection.
- the coupling area of the bus bar 210 is sufficiently secured to resist resistance of the battery pack including the cylindrical battery 200 . can be sufficiently lowered.
- the cylindrical battery according to the above-described embodiments (variations) may be used to manufacture a battery pack.
- 17 is a diagram schematically illustrating a configuration of a battery pack according to an embodiment of the present invention.
- a battery pack 300 includes an assembly to which a cylindrical battery 301 is electrically connected and a pack housing 302 accommodating the same.
- the cylindrical battery 301 may be any one of the batteries according to the above-described embodiments (modified examples).
- parts such as a bus bar, a cooling unit, and an external terminal for electrical connection of the cylindrical batteries 301 are omitted for convenience of illustration.
- the battery pack 300 may be mounted in a vehicle.
- the vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle.
- the automobile includes a four-wheeled vehicle or a two-wheeled vehicle.
- FIG. 18 is a view for explaining a vehicle including the battery pack 300 of FIG. 17 .
- a vehicle V according to an embodiment of the present invention includes a battery pack 300 according to an embodiment of the present invention.
- the vehicle V operates by receiving power from the battery pack 300 according to an embodiment of the present invention.
- the welding target area where the uncoated area is uniformly overlapped in the radial direction of the electrode assembly is sufficiently secured to increase the welding output, but damage can be prevented.
- the structure of the uncoated area adjacent to the core of the electrode assembly is improved to prevent clogging of the cavity in the core of the electrode assembly when the uncoated area is bent, so that the electrolyte injection process and the battery housing (or terminal) and The welding process of the current collector can be easily performed.
- a cylindrical battery having a low internal resistance and improved welding strength between a current collector and an uncoated region, a battery pack including the same, and a vehicle.
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Abstract
Description
Claims (53)
- 제1전극, 제2전극 및 이들 사이에 개재된 세퍼레이터가 일 축을 중심으로 권취되어 코어와 외주면을 정의하는 전극 조립체에 있어서,상기 제1전극 및 상기 제2전극 중 적어도 하나는 상기 권취 방향을 따르는 장변 단부에 상기 세퍼레이터를 넘어서 상기 축 방향으로 노출된 무지부를 포함하고,상기 무지부의 적어도 일 부분은 상기 전극 조립체의 반경 방향을 따라 절곡됨으로써 상기 무지부의 중첩 레이어들을 가지는 절곡 표면영역을 정의하고,상기 절곡 표면영역은, 상기 무지부의 중첩 레이어들을 복수개 가지는 용접 타겟 영역을 구비하고, 상기 용접 타겟 라인은 상기 전극 조립체의 반경 방향으로 연장된 것인, 전극 조립체.
- 제1항에 있어서,상기 무지부의 두께는 5um 내지 25um이고, 인접하는 권회턴 사이의 무지부 간격은 350 내지 380um인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역에서 상기 무지부의 중첩 레이어들의 평균 적층 두께는 25um 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역에서 상기 무지부의 중첩 레이어들은 상기 축 방향과 실질적으로 수직으로 적층된 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 전극 조립체의 반경 대비 상기 용접 타겟 영역의 반경 방향 길이의 비율은 30% 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 전극 조립체의 반경 대비 상기 용접 타겟 영역의 반경 방향 길이의 비율은 40% 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 전극 조립체의 반경 대비 상기 용접 타겟 영역의 반경 방향 길이의 비율은 50% 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 전극 조립체의 반경 대비 상기 용접 타겟 영역의 반경 방향 길이의 비율은 60% 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 전극 조립체의 반경 대비 상기 용접 타겟 영역의 반경 방향 길이의 비율은 70% 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 반경 방향을 따라 상기 무지부의 평균 중첩 레이어 수가 5장 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 반경 방향을 따라 상기 무지부의 평균 중첩 레이어 수가 6장 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 반경 방향을 따라 상기 무지부의 평균 중첩 레이어 수가 7장 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 반경 방향을 따라 상기 무지부의 평균 중첩 레이어 수가 8장 이상인 용접 타겟 영역을 포함하는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 반경 방향을 따라 상기 무지부의 평균 중첩 레이어 수가 9장 이상인 용접 타겟 영역을 포함하는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 반경 방향을 따라 상기 무지부의 평균 중첩 레이어 수가 10장 이상인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 무지부의 다른 부분은 절곡되지 않으며, 상기 용접 타겟 영역과 상기 무지부의 다른 부분 사이의 경계(boundary)는 상기 축 방향을 따라 커팅 되어 있는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 코어 중심으로부터 외각측으로 방사상으로 배치되는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 코어 중심으로부터 외각측으로 십자 형태로 배치되는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 용접 타겟 영역에 용접된 집전체를 포함하는 것을 특징으로 하는 전극 조립체.
- 제19항에 있어서,상기 집전체는 상기 용접 타겟 영역에 레이저 용접 또는 초음파 용접된 것임을 특징으로 하는 전극 조립체.
- 제19항에 있어서,상기 집전체와 상기 용접 타겟 영역 사이의 용접 패턴은 성기 전극 조립체의 반경 방향을 따라 선형으로 배열된 복수의 도트 패턴을 포함하는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 무지부는 상기 전극 조립체의 코어 측 또는 외각 측에 인접한 영역에서 상기 전극 조립체의 권취 축 방향의 높이가 나머지 영역보다 낮은 무지부 커팅부를 포함하는 것을 특징으로 하는 전극 조립체.
- 제22항에 있어서,상기 무지부 커팅부에 잔존하는 무지부 부분은 절곡되지 않는 것을 특징으로 하는 전극 조립체.
- 제22항에 있어서,상기 무지부 커팅부가 권취되면서 형성되는 권취 턴들의 반경 방향 폭은 상기 무지부의 절곡 길이보다 큰 것을 특징으로 하는 전극 조립체.
- 제22항에 있어서,상기 무지부 커팅부에 잔존하는 무지부의 높이는 0.2 내지 4mm임인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 무지부가 절곡되기 전, 상기 축 방향을 따라 연장된 무지부의 최대 높이는 12mm인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 무지부의 절곡 깊이는 1mm 내지 5mm인 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 제1전극 및 상기 제2전극 중에서 상기 무지부를 가지는 전극은 상기 축 방향을 따라 한 쌍의 단변들(short sides)을 가지며, 상기 한 쌍의 단변들은 동일한 길이 또는 다른 길이를 가지는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 제1전극 및 상기 제2전극 중에서 상기 무지부를 가지는 전극은 상기 권취 방향을 따라 한 쌍의 장변들(long sides)을 가지며, 상기 한 쌍의 장변들은 동일한 길이 또는 다른 길이를 가지는 것을 특징으로 하는 전극 조립체.
- 제1전극 및 제2전극과 이들 사이에 개재된 세퍼레이터가 일 축을 중심으로 권취되어 코어와 외주면을 정의한 전극 조립체로서, 상기 제1전극 및 상기 제2전극은, 각각, 상기 권취 방향을 따르는 장변 단부에 상기 세퍼레이터를 넘어서 상기 축 방향으로 노출된 무지부를 포함하고, 상기 무지부의 적어도 일 부분은 상기 전극 조립체의 반경 방향을 따라 절곡됨으로써 상기 무지부의 중첩 레이어들을 가지는 절곡 표면영역을 정의하고, 상기 절곡 표면영역은, 상기 무지부의 중첩 레이어들을 복수개 가지는 용접 타겟 영역을 구비하고, 상기 용접 타겟 라인은 상기 전극 조립체의 반경 방향으로 연장된 것인, 전극 조립체;상기 전극 조립체가 수납되며, 개방부를 가진 제1단부(first end)와 제2단부(second end)를 가지는 전지 하우징;상기 전지 하우징의 상기 제1단부에서 상기 개방부를 밀봉하는 밀봉체;상기 전지 하우징의 제2단부 또는 상기 밀봉체를 통해 외부로 노출된 표면을 가지는 단자;상기 제1전극의 무지부의 용접 타겟 영역과 상기 단자에 전기적으로 연결된 제1집전체; 및상기 제2전극의 무지부의 용접 타겟 영역과 상기 전지 하우징에 전기적으로 연결된 제2집전체를 포함하는 것을 특징으로 배터리.
- 제30항에 있어서,상기 단자는 상기 전지 하우징의 제2단부에 있는 관통홀에 배치된 리벳 단자이고,상기 전지 하우징의 제2단부의 관통홀과 상기 리벳 단자 사이에 밀봉 가스켓이 개재된 것을 특징으로 하는 배터리.
- 제31항에 있어서,상기 리벳 단자는 상기 제1집전체에 용접된 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 밀봉체는 상기 전지 하우징의 상기 제1단부의 개방부에서 밀봉 가스켓과 함께 크림핑된 캡을 포함하고,상기 밀봉 가스켓은 상기 캡과 상기 전지 하우징의 제1단부의 개방부 사이에 개재되어 상기 전지 하우징으로부터 상기 캡을 절연시키는 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 전지 하우징의 제1단부의 개방부 근처에 비딩부를 포함하고,상기 밀봉체는, 상기 전지 하우징의 제1단부의 개방부에서 밀봉 가스켓과 함께 클림핑된 캡을 포함하고,상기 제2집전체는 가장 자리의 적어도 일부가 상기 비딩부와 상기 밀봉 가스켓 사이에 개재되어 상기 비딩부의 내측면과 접촉하는 것을 특징으로 하는 배터리.
- 제34항에 있어서,상기 제2집전체는 가장 자리의 적어도 일부가 상기 비딩부의 내측면에 용접된 것을 특징으로 하는 배터리.
- 제34항에 있어서,상기 캡은 전기적 극성을 갖지 않는 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 용접 타겟 영역은 상기 전극 조립체의 반경 방향을 따라 상기 무지부의 평균 중첩 레이어 수가 5장 이상임을 특징으로 하는 배터리.
- 제30항에 있어서,상기 용접 타겟 영역에서 상기 무지부의 중첩 레이어들의 평균 적층 두께는 25um 이상인 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 제1집전체에는, 상기 제1전극의 무지부의 용접 타겟 영역과 상기 제1집전체 사이의 용접에 의해 형성된 제1용접 패턴이 구비되고,상기 제2집전체에는, 상기 제2전극의 무지부의 용접 타겟 영역과 상기 제2집전체 사이의 용접에 의해 형성된 제2용접 패턴이 구비되는 것을 특징으로 하는 배터리.
- 제39항에 있어서,상기 제1용접 패턴과 상기 제2용접 패턴은 상기 전극 조립체의 코어 중심으로부터 5mm 내지 10mm 이격된 지점에서 시작되어 상기 전극 조립체의 반경 방향을 따라 연장된 것을 특징으로 하는 배터리.
- 제39항에 있어서,상기 제1용접 패턴과 상기 제2용접 패턴은 상기 전극 조립체의 코어 중심으로부터 동일한 거리로 이격된 지점으로부터 시작되어 상기 전극 조립체의 반경 방향을 따라 연장된 것을 특징으로 하는 배터리.
- 제39항에 있어서,상기 제1용접 패턴과 상기 제2용접 패턴은 상기 전극 조립체의 반경 방향으로 동일한 길이를 가지는 것을 특징으로 하는 배터리.
- 제39항에 있어서,상기 제1용접 패턴과 상기 제2용접 패턴은 상기 전극 조립체의 반경 방향으로 서로 다른 길이를 가지는 것을 특징으로 하는 배터리.
- 제43항에 있어서,상기 제1용접 패턴은 상기 제2용접 패턴보다 더 긴 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 무지부가 절곡되기 전, 상기 축 방향을 따라 연장되는 무지부의 최대 높이는 12mm임을 특징으로 하는 배터리.
- 제30항에 있어서,상기 무지부의 다른 부분은 절곡되지 않으며, 상기 무지부의 다른 부분과 상기 용접 타겟 영역 사이의 경계(boundary)는 커팅되어 있는 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 무지부의 절곡 깊이는 1mm 내지 5mm임을 특징으로 하는 배터리.
- 제30항에 있어서,상기 제1전극 및 상기 제2전극은 각각 상기 축 방향을 따르는 한 쌍의 단변들을 포함하고, 상기 한 쌍의 단변들은 동일한 길이 또는 다른 길이를 가지는 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 제1전극 및 상기 제2전극은 각각 상기 권취 방향을 따르는 한 쌍의 장변들을 포함하고, 상기 한 쌍의 장변들은 동일한 길이 또는 다른 길이를 가지는 것을 특징으로 하는 배터리.
- 제30항에 있어서,상기 단자와 상기 전지 하우징의 제2단부 사이에서 측정한 저항이 4밀리오옴(mΩ) 이하임을 특징으로 하는 배터리.
- 제30항에 있어서,상기 배터리의 높이 대비 직경의 비율이 0.4보다 큰 것을 특징으로 하는 배터리.
- 제30항 내지 제51항 중 어느 한 항에 따른 배터리를 포함하는 배터리 팩.
- 제52항에 따른 배터리 팩;을 포함하는 것을 특징으로 하는 자동차.
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US18/277,947 US20240128605A1 (en) | 2021-02-19 | 2022-02-18 | Electrode assembly, battery, and battery pack and vehicle including the same |
EP22756576.9A EP4270628A1 (en) | 2021-02-19 | 2022-02-18 | Electrode assembly and battery, and battery pack and vehicle comprising same |
CA3207443A CA3207443A1 (en) | 2021-02-19 | 2022-02-18 | Electrode assembly, battery, and battery pack and vehicle including the same |
JP2023535291A JP2023553926A (ja) | 2021-02-19 | 2022-02-18 | 電極組立体、バッテリー、それを含むバッテリーパック及び自動車 |
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KR1020210142197A KR20220118889A (ko) | 2021-02-19 | 2021-10-22 | 전극 조립체, 원통형 배터리 셀 및 이를 포함하는 배터리 팩 및 자동차 |
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EP4345963A1 (en) * | 2022-08-30 | 2024-04-03 | Samsung SDI Co., Ltd. | Cylindrical secondary battery and manufacturing method of secondary battery |
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US20240113401A1 (en) * | 2022-10-04 | 2024-04-04 | Samsung Sdi Co., Ltd. | Secondary battery |
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Also Published As
Publication number | Publication date |
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EP4270628A1 (en) | 2023-11-01 |
CN217306537U (zh) | 2022-08-26 |
KR20220118952A (ko) | 2022-08-26 |
CA3207443A1 (en) | 2022-08-25 |
JP2023553926A (ja) | 2023-12-26 |
US20240128605A1 (en) | 2024-04-18 |
CN114975846A (zh) | 2022-08-30 |
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