WO2023085665A1 - 전해액 함침성이 우수한 젤리-롤 및 이를 포함하는 원통형 배터리 셀, 배터리 팩 및 자동차 - Google Patents
전해액 함침성이 우수한 젤리-롤 및 이를 포함하는 원통형 배터리 셀, 배터리 팩 및 자동차 Download PDFInfo
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- WO2023085665A1 WO2023085665A1 PCT/KR2022/016735 KR2022016735W WO2023085665A1 WO 2023085665 A1 WO2023085665 A1 WO 2023085665A1 KR 2022016735 W KR2022016735 W KR 2022016735W WO 2023085665 A1 WO2023085665 A1 WO 2023085665A1
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- jelly
- roll
- electrode
- slits
- electrode tab
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/64—Constructional details of batteries specially adapted for electric vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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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 jelly-roll having excellent electrolyte impregnability, and a cylindrical battery cell, battery pack, and automobile including the same.
- Secondary batteries which are highly applicable to each product group and have electrical characteristics such as high energy density, are used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by an electrical driving source. It is universally applied. These secondary batteries have not only the primary advantage of significantly reducing the use of fossil fuels, but also the advantage of not generating any by-products due to the use of energy, so they are attracting attention as a new energy source for eco-friendliness and energy efficiency improvement.
- EVs electric vehicles
- HEVs hybrid electric vehicles
- a battery pack may be configured by connecting a plurality of battery cells in series.
- a battery pack may be configured by connecting a plurality of battery cells in parallel according to a charge/discharge capacity required for the battery pack. Accordingly, the number of battery cells included in the battery pack may be variously set according to a required output voltage and/or charge/discharge capacity.
- electrolyte impregnation is a very important factor affecting the lifespan and capacity of a battery, and the higher the electrolyte impregnation rate, the more advantageous it is.
- the present invention has been devised to solve the above problems, by forming a slit through which the electrolyte can pass through an electrode tab of a cylindrical battery cell, so that the electrolyte is applied to the entire jelly-roll type electrode assembly accommodated inside the cylindrical battery cell.
- One object is to improve the electrolyte impregnability of the cylindrical battery cell by uniformly impregnating it.
- the present invention for another purpose, is to bend one end of the electrode tab to secure a wide contact area between the electrode tab of the jelly-roll type electrode assembly and the current collecting plate, thereby reducing the internal resistance of the cylindrical battery cell. do.
- Another object of the present invention is to improve the bonding strength between the jelly-roll-type electrode assembly and the current-collecting plate by ensuring a wide contact area between the electrode tab of the jelly-roll-type electrode assembly and the current-collecting plate.
- a jelly-roll according to an aspect of the present invention for achieving the above object includes a first electrode having a first electrode tab having a first polarity; a second electrode having a second electrode tab having a second polarity; and a separator interposed between the first electrode and the second electrode.
- a laminate comprising is a jelly-roll having a structure wound in one direction.
- At least one of the first electrode tab and the second electrode tab has a plurality of slits formed along the winding direction of the jelly-roll, and the distance between the plurality of slits is It may gradually increase from the core side to the outer circumferential side.
- the plurality of slits may have a shape extending in a direction parallel to the winding direction.
- the plurality of slits may be formed on the same line.
- the plurality of slits may be formed on a straight line parallel to a winding direction of the first electrode or the second electrode.
- the length of the slit in the winding direction may gradually increase from the core side to the outer circumferential side of the jelly-roll.
- slits adjacent to each other along the radial direction of the jelly-roll may overlap at least a portion of each other to form an impregnation path through which the electrolyte may pass along the radial direction.
- the impregnation path may be formed from the outer circumferential surface of the jelly-roll to a predetermined depth along the radial direction.
- At least one of the first electrode tab and the second electrode tab includes a plurality of sections formed spaced apart from each other along the winding direction of the jelly-roll and formed at a predetermined depth from an end of the electrode tab. It may be provided with a plurality of bent parts partitioned by improvement.
- the plurality of bent parts may be bent in a direction toward the winding axis of the jelly-roll to cover at least a portion of one side surface of the jelly-roll perpendicular to the winding axis.
- the plurality of bent parts may be bent in a direction toward the winding axis of the jelly-roll, so as to entirely cover one side surface of the jelly-roll perpendicular to the winding axis.
- slits adjacent to each other along the radial direction of the jelly-roll overlap each other at least partially to form an impregnation path through which the electrolyte solution can pass along the radial direction, and the impregnation path is , It is formed from the outer circumferential surface of the jelly-roll to a predetermined depth along the radial direction, and the formation depth of the impregnation path is the area covered by the bent part among one side of the jelly-roll perpendicular to the winding axis. may be greater than or equal to the radial length of
- the incision line and the slit may be spaced apart from each other by a predetermined distance.
- cylindrical battery cell according to an embodiment of the present invention includes a jelly-roll according to the above-described embodiments.
- a battery pack according to an embodiment of the present invention includes at least one cylindrical battery cell according to an embodiment of the present invention.
- a vehicle according to an embodiment of the present invention includes at least one battery pack according to an embodiment of the present invention.
- the present invention it is possible to improve the electrolyte impregnability of the jelly-roll electrode assembly. More specifically, according to the present invention, it is possible to shorten the electrolyte impregnation time into the jelly-roll electrode assembly and improve the uniformity of electrolyte impregnation. Accordingly, it is possible to achieve an increase in initial efficiency.
- a uniform solid electrolyte interphase (SEI) layer may be formed at the interface of the electrode.
- the cylindrical battery cell Electrolyte impregnability can be improved.
- the contact area between the electrode tab of the jelly-roll type electrode assembly and the current collecting plate is secured widely, thereby reducing the internal resistance of the cylindrical battery cell.
- the present invention by ensuring a wide contact area between the electrode tab of the jelly-roll-shaped electrode assembly and the current-collecting plate, it is possible to improve the bonding strength between the jelly-roll-shaped electrode assembly and the current-collecting plate.
- the present invention may have various other effects, which will be described in each embodiment, or descriptions of effects that can be easily inferred by those skilled in the art will be omitted.
- FIG. 1 is a view for explaining a jelly-roll according to an embodiment of the present invention.
- FIG. 2 is a view for explaining a state in which the first electrode applied to the jelly-roll of FIG. 1 is spread out.
- Figure 3 is a plan view of the jelly-roll of Figure 1;
- Figure 4 is a view for explaining the impregnation path of the jelly-roll of Figure 3.
- FIG. 5 is a diagram for explaining the impregnation path of a jelly-roll according to another embodiment of the present invention.
- Figure 6 is a front cross-sectional view of the jelly-roll of Figure 1;
- FIG. 7 is a plan view of a jelly-roll having a different shape from the jelly-roll shown in FIG. 3 .
- Figure 8 is a front cross-sectional view of the jelly-roll of Figure 7;
- FIG. 9 is a view for explaining a battery pack including at least one cylindrical battery cell including the jelly-roll of FIG. 1 .
- FIG. 10 is a diagram for explaining a vehicle including the battery pack of FIG. 9 .
- FIG. 1 is a view for explaining a jelly-roll according to an embodiment of the present invention
- FIG. 2 is a view for explaining a first electrode applied to the jelly-roll of FIG. 1 in an unfolded state.
- the electrode assembly is an electrode assembly having a jelly-roll shape in which a laminate including a first electrode, a second electrode, and a separator is wound.
- an electrode assembly having a jelly-roll shape will be referred to as a jelly-roll (1).
- the first electrode includes a first electrode tab having a first polarity
- the second electrode includes a second electrode tab having a second polarity
- the first electrode may be an anode or a cathode
- the second electrode may be an electrode having a polarity opposite to that of the first electrode.
- a separator is interposed between the first electrode and the second electrode.
- a laminate in which the first electrode, the separator, the second electrode, and the separator are sequentially laminated at least once has a width direction of the first electrode and a second electrode, that is, a height direction of the jelly-roll 1 (direction parallel to the Z axis). ) to form a jelly-roll (1). That is, the jelly-roll 1 has a structure in which a laminate including a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode is wound in one direction.
- the 1st electrode and the 2nd electrode are respectively equipped with an electrode tab and a holding part.
- 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. At one end of the first electrode current collector in the width direction (direction parallel to the Z-axis), there is a non-coated portion to which the first electrode active material is not applied.
- the uncoated portion functions as the first electrode tab 10 by itself. That is, the first electrode tab 10 is a first uncoated portion.
- the first electrode tab 10 is provided above the height direction (direction parallel to the Z-axis) of the electrode assembly accommodated in the battery can.
- On the opposite side of the uncoated portion of the first electrode current collector there is a holding portion 20 coated with the first electrode active material.
- 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.
- a non-coated portion to which the second electrode active material is not applied.
- the uncoated portion itself functions as a second electrode tab. That is, the second electrode tab is a second uncoated portion.
- the second electrode tab is provided below the electrode assembly accommodated in the battery can in the height direction.
- On the opposite side of the uncoated portion of the second electrode current collector there is a holding portion coated with the second electrode active material.
- the positive active material coated on the positive electrode plate and the negative active material coated on the negative electrode plate may be used without limitation as long as they are known in the art.
- the cathode active material has the general formula A[A x M y ]O 2+z (A includes at least one element of Li, Na, and K; M is Ni, Co, Mn, Ca, Mg, Al, including at least one element selected from Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; x ⁇ 0, 1 ⁇ x+y ⁇ 2, - 0.1 ⁇ z ⁇ 2; the stoichiometric coefficients of the components included in x, y, z and M are selected such that the compound remains electrically neutral).
- the cathode active material is an alkali metal compound disclosed in US6,677,082, US6,680,143, etc. xLiM 1 O 2 -(1-x)Li 2 M 2 O 3 (M 1 is at least one element having an average oxidation state of 3). contains; M 2 contains at least one element having an average oxidation state of 4; 0 ⁇ x ⁇ 1).
- the cathode active material has the general formula Li a M 1 x Fe 1 - x M 2 y P 1 - y M 3 z O 4 -z
- M 1 is Ti, Si, Mn, Co, Fe, V, Includes at least one element selected from Cr, Mo, Ni, Nd, Al, Mg, and Al
- M 2 is Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al , As, Sb, Si, Ge, including at least one element selected from V and S
- M 3 contains a halogen group element optionally including F; 0 ⁇ a ⁇ 2, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1; the stoichiometric coefficients of the components included in a, x, y, z, M 1 , M 2 , and M 3 are selected such that the compound remains electrically neutral), or Li 3 M 2 It may be a lithium metal
- the cathode active material may include primary particles and/or secondary particles in which the primary particles are aggregated.
- the negative electrode active material may use a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, or the like.
- Metal oxides such as TiO 2 and SnO 2 having a potential of less than 2 V can also be used as an anode active material.
- the carbon material both low crystalline carbon and high crystalline carbon may be used.
- the separator is a porous polymer film, for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer. Alternatively, they may be laminated and used. As another example, the separator may use a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, or the like.
- At least one surface of the separator may include a coating layer of inorganic particles. It is also possible that the separation membrane itself is made of a coating layer of inorganic particles. Particles constituting the coating layer may have a structure combined with a binder so that an interstitial volume exists between adjacent particles.
- the inorganic particles may be made of an inorganic material having a dielectric constant of 5 or more.
- the inorganic particles are Pb(Zr,Ti)O 3 (PZT), Pb 1 - x La x Zr 1 - y Ti y O 3 (PLZT), PB(Mg 3 Nb 2/3 )O 3 - PbTiO 3 (PMN - PT), BaTiO 3 , hafnia(HfO 2 ), SrTiO 3 , TiO 2 , Al 2 O 3 , ZrO 2 , SnO 2 , CeO 2 , MgO, CaO, ZnO and Y 2 O 3 It may include at least one or more materials selected from the group consisting of.
- the electrolyte may be a salt having a structure such as A + B - .
- a + includes alkali metal cations such as Li + , Na + , and K + or ions made of combinations thereof.
- B - is F - , Cl - , Br - , I - , 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
- the electrolyte can also be used by dissolving it in an organic solvent.
- organic solvent propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC) , dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone 2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), ⁇ -butyrolactone, or mixtures thereof may be used.
- the first electrode and the second electrode extend in opposite directions along the height direction of the jelly-roll 1 (direction parallel to the Z-axis).
- the structure of the first electrode is specifically described. However, this is only an exemplary description, and the structure of the first electrode to be described below may be applied to both the first electrode and the second electrode, or may be applied only to the second electrode.
- the first electrode tab 10 includes a plurality of slits 10a.
- the first electrode tab 10 may further include a plurality of incision lines 10b and a bent portion 10c partitioned by the incision lines 10b.
- the plurality of slits 10a may be formed by, for example, die punching or laser notching.
- a plurality of slits 10a are formed in plurality along the circumferential direction of the jelly-roll 1, that is, along the winding direction of the jelly-roll 1.
- the plurality of slits 10a may be formed on the same line.
- the plurality of slits 10a may be formed on a straight line parallel to the winding direction of the first electrode and/or the second electrode. That is, the longitudinal extension lines of the slits 10a adjacent to each other along the winding direction may overlap each other.
- the distance between the plurality of slits 10a may gradually increase from the core side of the jelly-roll 1 to the outer circumferential side. That is, the plurality of slits 10a may be provided in a gradient pattern.
- the sheet-like first electrode and/or second electrode has a structure in which it is wound in one direction.
- a plurality of slits 10a are provided along the winding direction.
- the distance between the slits 10a may be relatively close on the core side of the first electrode and/or the second electrode, and the distance between the slits 10a may gradually increase toward the outer circumference.
- the radius of the jelly-roll 1 increases, and the length of the circumference formed by the layers constituting the jelly-roll 1 increases toward the outer circumference. because it keeps increasing.
- the distance between the slit 10a must be increased toward the outer circumference, so that the slit 10a provided in the previous layer and the next layer
- the slits 10a provided in face each other to form an impregnation path IP.
- the distance between the slits 10a must increase as the number of turns increases.
- the distance between the slits 10a should increase as the number of turns increases.
- the exact position of the slits 10a for forming the impregnation path IP may vary depending on the number of slits 10a per circumference, the thickness of the first electrode, the thickness of the second electrode, and the thickness of the separator.
- the slit 10a can be provided at a point of a specific angle of the jelly-roll 1, the impregnation path IP can be formed effectively. Accordingly, the property of impregnating the electrolyte at the center of the electrode of the jelly-roll 1 can be improved.
- the impregnation path IP can be reliably formed. Accordingly, it is possible to minimize a decrease in strength of the first electrode tab 10 and/or the second electrode tab.
- the strength of the first electrode tab 10 can be secured at a certain level.
- the impregnation path (IP) in the radial direction of the jelly-roll 1 it will be necessary to form long winding direction lengths of the plurality of slits 10a.
- IP impregnation path
- the strength of the first electrode tab 10 at the position where the plurality of slits 10a are formed may be very weak. That is, the first electrode tab 10 is a cross section at the position where the slit 10a is formed, that is, a cross section cut along a direction perpendicular to the winding axis of the jelly-roll 1 (direction parallel to the X-Y plane) area will decrease. Therefore, damage to the first electrode tab 10 may occur due to shock, vibration, etc. applied during the use of the cylindrical battery cell, which causes poor performance of the cylindrical battery cell and/or safety such as ignition due to an internal short circuit. Issues may arise.
- the first electrode tab 10 is cut along the cross section at the position where the slit 10a is formed, that is, in a direction substantially perpendicular to the winding axis of the jelly-roll 1 (direction parallel to the X-Y plane) It is possible to minimize the reduction of the area of one cross section.
- the tensile strength of the first electrode tab 10 in the direction of the winding axis can be improved. Therefore, in this case, even if an external force is applied to the first electrode tab 10, the first electrode tab 10 is not easily broken.
- Figure 3 is a plan view of the jelly-roll of Figure 1; 4 is a view for explaining the impregnation path of the jelly-roll of FIG. 3, and FIG. 5 is a view for explaining the impregnation path of the jelly-roll according to another embodiment of the present invention.
- the slit 10a may have a constant length in the winding direction, regardless of the location where the slit 10a is provided.
- the width of the impregnation path (IP) can be formed constant.
- the length of the slit 10a in the winding direction may gradually increase from the core side of the jelly-roll 1 to the outer circumferential side. there is. Accordingly, as can be seen in FIG. 5 , the width of the impregnation path IP may gradually increase toward the outer circumference of the jelly-roll 1 . In this case, the center of the length of the slit 10a provided in the previous layer in the winding direction may coincide with the center of the length of the slit 10a provided in the next layer in the winding direction.
- the jelly-roll 1 is smoothly impregnated with the electrolyte.
- the area of the slit 10a provided on the core side is formed small, the area of the cross section cut along the direction perpendicular to the winding axis of the jelly-roll 1 (direction parallel to the X-Y plane) is reduced. can be minimized
- the tensile strength of the first electrode tab 10 in the direction of the winding axis can be improved. Therefore, in this case, even if an external force is applied to the first electrode tab 10, the first electrode tab 10 is not easily broken.
- the slit 10a is formed in the direction of extension of the incision 10b and the winding axis (parallel to the Z axis), which will be described later. direction) may be arranged so as to be spaced apart from each other by a predetermined distance. Accordingly, the possibility of breakage of the first electrode tab 10 due to an external force such as shock or vibration that may be applied during manufacturing and using the cylindrical battery cell may be further reduced.
- the slit 10a is provided in the first electrode for convenience of description, but the slit 10a is provided only in the second electrode, or the first electrode and the second electrode are provided. Of course, it can be provided in all.
- FIG. 3 is a plan view of the jelly-roll of FIG. 1
- FIG. 6 is a front cross-sectional view of the jelly-roll of FIG.
- the first electrode tabs 10 are formed spaced apart from each other along the winding direction of the jelly-roll 1 and extend to a predetermined depth from the end of the first electrode tab 10.
- a plurality of bent portions 10c partitioned by a plurality of cut lines 10b formed may be provided. Accordingly, the bent portion 10c is provided at one end of the first electrode tab 10 . That is, the first electrode tab 10 may include a plurality of segments divided along the circumferential direction of the jelly-roll 1 by, for example, notching, and these segment segments are jelly-rolls. It can be bent along the radial direction of the roll (1). Each segment piece bent in this way corresponds to the above-described bent portion 10c.
- the plurality of bent portions 10c are, for example, bent in a direction toward the winding axis of the jelly-roll 1 to cover at least a portion of one side surface of the jelly-roll 1 substantially perpendicular to the winding axis. can do.
- the plurality of bent parts 10c may entirely cover one side surface of the jelly-roll 1 perpendicular to the winding axis.
- the bent portion 10c provided at one end of the first electrode tab 10 is bent to cover one side surface of the jelly-roll 1 perpendicular to the winding axis, so that the jelly-roll 1 A contact area between the first electrode tab 10 and a current collecting plate (not shown) to be coupled on one side of the ) may be secured. Accordingly, internal resistance of the cylindrical battery cell may be reduced. Also, the bonding strength between the jelly-roll 1 and the current collecting plate can be improved.
- an electrolyte solution may be injected through an upper opening of the battery can.
- the electrolyte solution since the plurality of bent parts 10c cover the whole surface of one side of the jelly-roll 1 perpendicular to the winding axis, the electrolyte solution is not smoothly impregnated through the top of the jelly-roll 1. may not be In particular, in the case of a medium-large sized cylindrical battery cell, the electrolyte may not be impregnated up to the center of the jelly-roll 1.
- the slits 10a adjacent to each other along the radial direction of the jelly-roll 1 are at least partially overlapped with each other, thereby impregnating the electrolyte through which the electrolyte solution can pass along the radial direction.
- a route (IP) can be formed.
- the impregnation path IP may be formed from the outer circumferential surface of the jelly-roll 1 to a predetermined depth along the radial direction.
- the plurality of bent portions 10c provided at one end of the first electrode tab 10 are bent in a direction toward the winding axis and perpendicular to the winding axis, the jelly-roll ( One side of 1) can be covered entirely.
- the slits 10a adjacent to each other along the radial direction of the jelly-roll 1 at least partially overlap each other, so that the electrolyte solution can pass along the radial direction (IP). ) can be formed.
- an impregnation path IP is formed along the radial direction from the outer peripheral surface of the jelly-roll 1 to the winding center C.
- the electrolyte solution can move to the center of the jelly-roll 1 through the impregnation path IP penetrating the jelly-roll 1 .
- the electrolyte solution flowing into the impregnation path IP may flow down under a force in the direction of gravity. Therefore, the entire area of the jelly-roll 1 of the present invention in its height direction (direction parallel to the Z-axis) and its entire radial direction can be uniformly impregnated with the electrolyte.
- the slit 10a may be provided in an area other than the area where the bent portion 10c is formed. Accordingly, the slit 10a may be provided on the outer circumferential surface of the jelly-roll 1 .
- FIG. 7 is a plan view of a jelly-roll having a different shape from the jelly-roll shown in FIG. 3, and FIG. 8 is a front cross-sectional view of the jelly-roll of FIG.
- the plurality of bent parts 10c are bent in a direction toward the winding axis of the jelly-roll 1, and one side of the jelly-roll 1 perpendicular to the winding axis. It may cover only part of the surface.
- the length of the first electrode tab 10 in the area adjacent to the winding center C of the jelly-roll 1 and the length of the first electrode tab 10 in the area adjacent to the outer circumferential surface of the jelly-roll 1 may have different lengths.
- the length of the first electrode tab 10 in the area adjacent to the winding center C of the jelly-roll 1 is the length of the first electrode tab 10 in the area adjacent to the outer circumferential surface of the jelly-roll 1 It may be shorter than the length.
- the first electrode tab 10 in the region adjacent to the winding center C of the jelly-roll 1 may not have the cut line 10b and the bent portion 10c. That is, only the first electrode tab 10 in the region adjacent to the outer circumferential surface of the jelly-roll 1 may be provided with a plurality of cut lines 10b and bent portions 10c.
- the first electrode tab 10 may have a structure in which the first electrode tab 10 is not bent and opened upward in a region adjacent to the winding center C of the jelly-roll 1 .
- a first area A1 an area whose upper side is not covered by the bent portion 10c will be referred to as a first area A1.
- D1 the radial length of the first area A1 is referred to as D1.
- the plurality of bent portions 10c provided on the first electrode tab 10 in the region adjacent to the outer circumferential surface of the jelly-roll 1 are bent in a direction toward the winding axis, and the jelly-roll perpendicular to the winding axis. It covers only a part of one side surface of the roll 1.
- the area whose upper side is covered by the bent portion 10c will be referred to as a second area A2.
- the radial length of the second area A2 is referred to as D2.
- the electrolyte flowing through the upper opening of the battery can smoothly flows into the first area A1. can be infiltrated. Therefore, the electrolyte impregnability can be further improved.
- the impregnation rate of the second area A2 the upper portion of which is covered due to the core-side bending of the plurality of bent portions 10c provided in the first electrode tab 10, is the first It may be slightly lower than the impregnation rate of region A1. Therefore, it is necessary to improve the impregnation rate of the second area A2. Therefore, in the present invention, the formation depth (P) of the impregnation path (IP) is, among the one side surface of the jelly-roll (1) perpendicular to the winding axis, the area covered by the bent portion (10c) It can be greater than or equal to the radial length. That is, referring to FIG. 8 , the formation depth P of the impregnation path IP may be greater than or equal to the radial length D2 of the second region A2.
- the electrolyte may move through the impregnation path IP to at least a boundary point between the second area A2 and the first area A1.
- the electrolyte may move beyond the second area A2 to the first area A1.
- the electrolyte solution can flow down under the force in the direction of gravity. Therefore, the inside of the jelly-roll 1 of the present invention can be uniformly impregnated with the electrolyte solution.
- the first electrode is provided with the incision 10b and the bent portion 10c has been described, but these incisions 10b and the bent portion 10c are Of course, it may be provided only on the two electrodes, or may be provided on both the first electrode and the second electrode.
- the electrolyte impregnability of the jelly-roll of the present invention was evaluated.
- a drop test and a vibration test were conducted to evaluate the strength of the electrode tab.
- a jelly-roll with slits for electrolyte impregnation is prepared. Thereafter, the jelly-roll is accommodated through an upper or lower opening of the battery can, and then an electrolyte solution is injected into the battery can. After the electrolyte is injected and aged for 24 hours, the impregnation level of the electrolyte (confirmation of the presence of non-impregnated regions) is analyzed.
- the jelly-roll and the current collector plate After welding the jelly-roll and the current collector plate, it is put into a battery can to fabricate a cylindrical battery cell. Then, the cylindrical battery cell fully discharged to 2.5V is vibrated.
- the vibration method is to repeat 12 times in each direction of the X-axis, Y-axis, and Z-axis by changing the frequency at 7Hz ⁇ 200HZ every 15 minutes. After the vibration test is completed, it is checked whether an internal short and/or ignition of the cylindrical battery cell has occurred.
- a plurality of slits were formed on the same line, and the jelly roll was manufactured so that the distance between the plurality of slits gradually increased from the core side of the jelly roll to the outer circumferential side (gradient pattern type).
- a jelly-roll was prepared in the same manner as in Example 1 except that no slits were provided.
- a jelly-roll was manufactured in the same manner as in Example 1 except that a plurality of slits were provided at regular intervals.
- the jelly-roll was manufactured so that the slits adjacent to each other along the winding direction were not formed on the same line but provided at staggered positions (zigzag type).
- Table 1 summarizes the results of evaluating the electrolyte impregnability and the strength of the electrode tab for each jelly-roll obtained as described above.
- Comparative Example 1 doesn't exist X O O Comparative Example 2 collinear, evenly spaced O X X Comparative Example 3 zig-zag, evenly spaced O X X Example 1 collinear, gradient pattern O O O
- Example 1 the electrolyte solution impregnability was excellent and there was no non-impregnated region in the jelly-roll. In addition, it was confirmed that the jelly-roll of Example 1 passed the drop test and the vibration test and secured excellent strength of the electrode tab.
- Comparative Example 2 Although the electrolyte impregnability was satisfactory, the strength of the electrode tab could not be secured because a plurality of slits formed long in the winding direction were provided at regular intervals on the same line. Specifically, in the jelly-roll of Comparative Example 2, part of the electrode tab was damaged as a result of the drop test and the vibration test. That is, in the jelly-roll of Comparative Example 2, the strength of the electrode tab was low, and the quality and safety of the battery could not be secured.
- Comparative Example 3 Although the electrolyte impregnability was satisfactory, the strength of the electrode tab could not be secured because a plurality of slits formed long in the winding direction were provided in a zigzag pattern at positions staggered from each other. Specifically, in the jelly-roll of Comparative Example 3, part of the electrode tab was damaged as a result of the drop test and the vibration test. That is, in the jelly-roll of Comparative Example 3, the strength of the electrode tab was low, and the quality and safety of the battery could not be secured.
- FIG. 9 is a diagram schematically showing the configuration of a battery pack according to an embodiment of the present invention.
- a battery pack 3 includes an assembly of cylindrical battery cells electrically connected to each other and a pack housing 2 accommodating them.
- the cylindrical battery cell is a battery cell according to the above-described embodiment.
- parts such as a bus bar, a cooling unit, and external terminals for electrically connecting cylindrical battery cells are omitted.
- the battery pack 3 may be mounted in a vehicle.
- the vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. Vehicles include four-wheeled vehicles or two-wheeled vehicles.
- FIG. 10 is a diagram for explaining a vehicle including the battery pack of FIG. 9 .
- a vehicle 5 according to an embodiment of the present invention includes a battery pack 3 according to an embodiment of the present invention.
- the vehicle 5 operates by receiving power from the battery pack 3 according to an embodiment of the present invention.
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Abstract
Description
구분 | 슬릿이 구비된 형상 | 전해액 함침성 테스트 |
낙하
테스트 |
진동
테스트 |
비교예 1 | 없음 | X | O | O |
비교예 2 | 동일 선상, 일정 간격 | O | X | X |
비교예 3 | 지그재그, 일정 간격 | O | X | X |
실시예 1 | 동일 선상, 구배(gradient) 패턴 | O | O | O |
Claims (15)
- 제 1 극성을 갖는 제 1 전극 탭을 구비하는 제 1 전극; 제 2 극성을 갖는 제 2 전극 탭을 구비하는 제 2 전극; 및 상기 제 1 전극 및 제 2 전극 사이에 개재되는 분리막; 을 포함하는 적층체가 일 방향으로 권취된 구조를 갖는 젤리-롤에 있어서,상기 제 1 전극 탭 및 상기 제 2 전극 탭 중 적어도 어느 하나는, 상기 젤리-롤의 권취 방향을 따라 형성되는 복수의 슬릿을 구비하며,상기 복수의 슬릿 사이의 거리는, 상기 젤리-롤의 코어측으로부터 외주측으로 갈수록, 점진적으로 증가하는, 젤리-롤.
- 제 1 항에 있어서,상기 복수의 슬릿은,상기 권취 방향과 나란한 방향으로 연장된 형상을 갖는 것을 특징으로 하는 젤리-롤.
- 제 1 항에 있어서,상기 복수의 슬릿은,동일한 선 상에 형성되는 것을 특징으로 하는 젤리-롤.
- 제 1 항에 있어서,상기 복수의 슬릿은,상기 제 1 전극 또는 제 2 전극의 권취 방향과 나란한 일직선 상에 형성되는 것을 특징으로 하는 젤리-롤.
- 제 1 항에 있어서,상기 슬릿의 권취 방향 길이는,상기 젤리-롤의 코어측으로부터 외주측으로 갈수록, 점진적으로 증가하는 것을 특징으로 하는 젤리-롤.
- 제 1 항에 있어서,상기 복수의 슬릿 중, 상기 젤리-롤의 반경 방향을 따라 서로 인접한 슬릿은, 서로 적어도 일부가 겹쳐짐으로써 상기 반경 방향을 따라 전해액이 통과할 수 있는 함침 경로를 형성하는 것을 특징으로 하는 젤리-롤.
- 제 6 항에 있어서,상기 함침 경로는,상기 젤리-롤의 외주면으로부터 상기 반경 방향을 따라 소정의 깊이까지 형성되는 것을 특징으로 하는 젤리-롤.
- 제 1 항에 있어서,상기 제 1 전극 탭 및 상기 제 2 전극 탭 중 적어도 어느 하나의 전극 탭은,상기 젤리-롤의 권취 방향을 따라 서로 이격되어 형성되며 상기 전극 탭의 단부로부터 소정 깊이로 형성되는 복수의 절개선에 의해 구획된 복수의 절곡부를 구비하는 것을 특징으로 하는 젤리-롤.
- 제 8 항에 있어서,상기 복수의 절곡부는,상기 젤리-롤의 권취 축을 향하는 방향으로 절곡되어,상기 권취 축과 수직한 상기 젤리-롤의 일측 면을 적어도 일부 커버하는 것을 특징으로 하는 젤리-롤.
- 제 8 항에 있어서,상기 복수의 절곡부는,상기 젤리-롤의 권취 축을 향하는 방향으로 절곡되어,상기 권취 축과 수직한 상기 젤리-롤의 일측 면을 전부 커버하는 것을 특징으로 하는 젤리-롤.
- 제 9 항에 있어서,상기 복수의 슬릿 중, 상기 젤리-롤의 반경 방향을 따라 서로 인접한 슬릿은, 서로 적어도 일부가 겹쳐짐으로써 상기 반경 방향을 따라 전해액이 통과할 수 있는 함침 경로를 형성하고,상기 함침 경로는, 상기 젤리-롤의 외주면으로부터 상기 반경 방향을 따라 소정의 깊이까지 형성되며,상기 함침 경로의 형성 깊이는, 상기 권취 축과 수직한 상기 젤리-롤의 일측 면 중에서 상기 절곡부에 의해 커버된 영역의 반경 방향 길이보다 크거나 같은 것을 특징으로 하는 젤리-롤.
- 제 8 항에 있어서,상기 절개선과 상기 슬릿은 서로 소정 간격 이격된 것을 특징으로 하는 젤리-롤.
- 제 1 항 내지 제 12 항에 기재된 젤리-롤을 포함하는 것을 특징으로 하는 원통형 배터리 셀.
- 제 13 항에 기재된 원통형 배터리 셀;을 적어도 하나 포함하는 것을 특징으로 하는 배터리 팩.
- 제 14 항에 기재된 배터리 팩;을 적어도 하나 포함하는 것을 특징으로 하는 자동차.
Priority Applications (4)
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JP2024517144A JP2024533607A (ja) | 2021-11-09 | 2022-10-28 | 電解液含浸性の優秀なゼリーロール及びそれを含む円筒形バッテリーセル、バッテリーパック並びに自動車 |
EP22893087.1A EP4376140A4 (en) | 2021-11-09 | 2022-10-28 | JELLY ROLL WITH IMPROVED ELECTROLYTE IMPREGNATION PROPERTY, AND CYLINDRICAL BATTERY CELL, BATTERY PACK AND VEHICLE COMPRISING SAME |
CA3237014A CA3237014A1 (en) | 2021-11-09 | 2022-10-28 | Jelly-roll with improved electrolyte impregnation property, and cylindrical battery cell, battery pack and vehicle including the same |
US18/706,683 US20250015455A1 (en) | 2021-11-09 | 2022-10-28 | Jelly-roll with improved electrolyte impregnation property, and cylindrical battery cell, battery pack and vehicle including the same |
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KR10-2021-0153452 | 2021-11-09 | ||
KR20210153452 | 2021-11-09 |
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WO2023085665A1 true WO2023085665A1 (ko) | 2023-05-19 |
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KR (1) | KR20230067518A (ko) |
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US6680143B2 (en) | 2000-06-22 | 2004-01-20 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
JP2008243672A (ja) * | 2007-03-28 | 2008-10-09 | Toshiba Corp | 二次電池用捲回電極、リチウムイオン二次電池および二次電池パック |
JP2009117290A (ja) * | 2007-11-09 | 2009-05-28 | Nec Tokin Corp | 密閉型電池 |
JP4401634B2 (ja) * | 2002-09-04 | 2010-01-20 | パナソニック株式会社 | 蓄電池およびその製造方法 |
KR100964490B1 (ko) * | 2007-10-12 | 2010-06-21 | 킴스테크날리지 주식회사 | 쿼지바이폴라 구조를 갖는 전기화학셀 |
US20190348719A1 (en) * | 2014-01-28 | 2019-11-14 | Lithium Werks Technology Bv | Cylindrical Electrochemical Cells and Method of Manufacture |
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JP2001093511A (ja) * | 1999-09-22 | 2001-04-06 | Honda Motor Co Ltd | 巻型円筒電池 |
KR100599749B1 (ko) * | 2004-06-23 | 2006-07-12 | 삼성에스디아이 주식회사 | 이차 전지와 이에 사용되는 전극 조립체 |
JP4655657B2 (ja) * | 2005-02-08 | 2011-03-23 | 新神戸電機株式会社 | 捲回形鉛蓄電池 |
JP5957239B2 (ja) * | 2012-02-21 | 2016-07-27 | 日立オートモティブシステムズ株式会社 | 二次電池 |
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2022
- 2022-10-28 JP JP2024517144A patent/JP2024533607A/ja active Pending
- 2022-10-28 CA CA3237014A patent/CA3237014A1/en active Pending
- 2022-10-28 US US18/706,683 patent/US20250015455A1/en active Pending
- 2022-10-28 EP EP22893087.1A patent/EP4376140A4/en active Pending
- 2022-10-28 KR KR1020220141255A patent/KR20230067518A/ko active Pending
- 2022-10-28 WO PCT/KR2022/016735 patent/WO2023085665A1/ko active Application Filing
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US6677082B2 (en) | 2000-06-22 | 2004-01-13 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
US6680143B2 (en) | 2000-06-22 | 2004-01-20 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
JP4401634B2 (ja) * | 2002-09-04 | 2010-01-20 | パナソニック株式会社 | 蓄電池およびその製造方法 |
JP2008243672A (ja) * | 2007-03-28 | 2008-10-09 | Toshiba Corp | 二次電池用捲回電極、リチウムイオン二次電池および二次電池パック |
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JP2009117290A (ja) * | 2007-11-09 | 2009-05-28 | Nec Tokin Corp | 密閉型電池 |
US20190348719A1 (en) * | 2014-01-28 | 2019-11-14 | Lithium Werks Technology Bv | Cylindrical Electrochemical Cells and Method of Manufacture |
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US20250015455A1 (en) | 2025-01-09 |
CA3237014A1 (en) | 2023-05-19 |
KR20230067518A (ko) | 2023-05-16 |
EP4376140A1 (en) | 2024-05-29 |
EP4376140A4 (en) | 2025-07-16 |
JP2024533607A (ja) | 2024-09-12 |
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