WO2023140454A1 - 이차 전지 - Google Patents
이차 전지 Download PDFInfo
- Publication number
- WO2023140454A1 WO2023140454A1 PCT/KR2022/013723 KR2022013723W WO2023140454A1 WO 2023140454 A1 WO2023140454 A1 WO 2023140454A1 KR 2022013723 W KR2022013723 W KR 2022013723W WO 2023140454 A1 WO2023140454 A1 WO 2023140454A1
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- WO
- WIPO (PCT)
- Prior art keywords
- case
- secondary battery
- electrode assembly
- plate
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
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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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- 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
- H01M50/147—Lids or covers
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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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
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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
- H01M50/147—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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- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/545—Terminals formed by the casing of the cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
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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
Definitions
- the present disclosure relates to a secondary battery.
- a cylindrical secondary battery includes a cylindrical electrode assembly, a cylindrical case accommodating the electrode assembly and the electrolyte, and a cap assembly coupled to an upper opening of the case to seal the case and electrically connected to the electrode assembly to electrically connect external components and the electrode assembly.
- Cylindrical secondary batteries generally have a structure in which a case with a negative electrode and a cap assembly with a positive electrode are insulated from each other by a gasket.
- a gasket In the case of a battery module using a plurality of connected cylindrical secondary batteries, since bus bars must be connected to upper and lower portions of the secondary batteries, respectively, the structure is complicated and manufacturing time may be increased.
- the present disclosure provides a cylindrical secondary battery in which both a positive terminal and a negative terminal are provided on one side to facilitate connection of a bus bar, and also to have excellent electrical connection reliability between an electrode assembly and a case.
- the present disclosure provides a cylindrical secondary battery having a current collector capable of injecting an electrolyte solution and discharging internal gas during thermal runaway.
- a secondary battery according to the present disclosure includes an electrode assembly; a case accommodating the electrode assembly; current collector plates respectively welded to the electrode assembly and the case; and a cap plate disposed on the current collector plate to seal the case.
- the current collecting plate may include an electrode welding part welded to the electrode assembly; a rigidity reinforcing portion provided outside the electrode welding portion; and a case welding portion provided outside the rigid reinforcement portion and welded to the case.
- the electrode welding part may further include a through hole provided in a region corresponding to a center of the cap plate.
- the rigidity reinforcement part or the case welding part may be thicker than the thickness of the electrode welding part.
- a bent notch provided along a boundary between the electrode welded portion and the rigidity reinforcing portion may be further included.
- case welding part may be bent toward the cap plate from the rigidity reinforcement part.
- the case welding part may be welded to the beading part of the case.
- an insulating gasket interposed between the case welding portion and the cap plate may be further included.
- an outer diameter of the current collector plate may be greater than an outer diameter of the electrode assembly.
- the present disclosure can provide a cylindrical secondary battery in which a positive electrode terminal and a negative electrode terminal are provided on one side to easily connect a bus bar and have excellent electrical connection reliability between an electrode assembly and a case.
- the present disclosure may provide a cylindrical secondary battery having a current collector capable of injecting an electrolyte solution and discharging internal gas during thermal runaway.
- FIG. 1 is a perspective view illustrating an exemplary secondary battery according to the present disclosure.
- FIG. 2 is a cross-sectional view of the secondary battery shown in FIG. 1 .
- FIG. 3 is an enlarged cross-sectional view of three portions of the secondary battery of FIG. 2 .
- 4A and 4B are plan and cross-sectional views illustrating an anode current collector in an exemplary secondary battery according to the present disclosure.
- first and second are used to describe various members, components, regions, layers, and/or portions, but these members, components, regions, layers, and/or portions are not limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described in detail below may refer to a second member, component, region, layer or section without departing from the teachings of the present disclosure.
- FIG. 1 is a perspective view showing an exemplary secondary battery 100 according to the present disclosure
- FIG. 2 is a cross-sectional view of the secondary battery 100 shown in FIG. 1 cut in the longitudinal direction
- FIG. 3 is an enlarged cross-sectional view of three portions of the secondary battery 100 of FIG. 2.
- the secondary battery 100 may include a cylindrical case 110, a cylindrical electrode assembly 120 accommodated inside the cylindrical case 110, a rivet terminal 150 coupled to a terminal hole provided at one end of the cylindrical case 110, and a cap plate 160 sealing an opening at the other end of the cylindrical case 110.
- the cylindrical case 110 may include a circular upper surface portion 111 and a side surface portion 112 extending downward from an edge of the upper surface portion 111 .
- the upper surface portion 111 and the side surface portion 112 of the cylindrical case 110 may be integral.
- case 110 may be referred to as a can or housing.
- the circular upper surface portion 111 may have a flat circular plate shape and may include a terminal hole 111a penetrating the center. The upper surface portion 111 may be coupled by inserting the rivet terminal 150 into the terminal hole 111a.
- a first gasket 111b for sealing and electrical insulation may be further interposed between the terminal hole 111a and the rivet terminal 150 .
- the first gasket 111b blocks contact between the rivet terminal 150 and the cylindrical case 110 to electrically separate the rivet terminal 150 and the cylindrical case 110 from each other.
- the terminal hole 111a of the upper surface portion 111 of the cylindrical case 110 may be sealed by the first gasket 111b.
- the first gasket 111b may include a resin material such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET).
- the lower part of the cylindrical case 110 of the secondary battery 100 may be opened during the manufacturing process. Therefore, during the manufacturing process of the secondary battery 100 , the electrode assembly 120 may be inserted through the open bottom of the cylindrical case 110 together with the electrolyte solution. In this case, the electrolyte solution and the electrode assembly 120 may be inserted into the cylindrical case 110 with the open lower part facing the upper part. After the electrolyte solution and the electrode assembly 120 are inserted into the cylindrical case 110 , the cap plate 160 is coupled to the opened lower end to seal the inside of the cylindrical case 110 . In some examples, the electrolyte serves to allow lithium ions to move between the positive plate 121 and the negative plate 122 constituting the electrode assembly 120 .
- the electrolyte solution may be a non-aqueous organic electrolyte solution that is a mixture of a lithium salt and high-purity organic solvents.
- the electrolyte solution may be a polymer using a polymer electrolyte or a solid electrolyte, but the type of electrolyte solution is not limited here.
- Cylindrical case 110 may include steel, steel alloy, aluminum or aluminum alloy.
- the cylindrical case 110 may be provided with a beading part 113 recessed inside around the cap plate 160 to prevent the electrode assembly 120 from escaping to the outside, and a crimping part 114 bent to the inside may be provided at a lower portion of the beading part 113.
- the beading portion 113 includes an upper flat portion 113a and a lower flat portion 113b substantially parallel to the upper surface portion 111, and a connection portion 113c connecting the upper flat portion 113a and the lower flat portion 113b.
- the outer surfaces of the upper flat portion 113a and the lower flat portion 113b may face each other. In some examples, the outer surface may be an outer surface of cylindrical case 110 .
- An edge of the lower surface of the electrode assembly 120 may be seated on the upper flat portion 113a of the beading portion 113 . That is, the edge of the lower surface of the electrode assembly 120 may contact the upper surface of the upper flat part 113a of the beading part 113 .
- the electrode assembly 120 may include a positive electrode plate 121 coated with a positive electrode active material, a negative electrode plate 122 coated with a negative electrode active material, and a separator 123 interposed between the positive electrode plate 121 and the negative electrode plate 122 to prevent a short circuit between the positive electrode plate 121 and the negative electrode plate 122 and to allow only the movement of lithium ions.
- the electrode assembly 120 is wound in a substantially cylindrical shape after the positive electrode plate 121, the negative electrode plate 122, and the separator 123 are stacked, and then wound from the winding end.
- the positive electrode uncoated portion not coated with the positive electrode active material may protrude from the positive electrode plate 121 in an upward direction, and the negative electrode uncoated portion not coated with the negative electrode active material may protrude downward from the negative electrode plate 122.
- the positive electrode plate 121 may include a positive electrode current collector plate, which is a plate-shaped metal foil made of aluminum (Al), and a positive electrode active material made of a transition metal oxide coated on at least one surface of the positive electrode current collector plate.
- the positive electrode plate 121 may include a positive electrode uncoated portion on an upper portion of which the positive electrode active material is not coated. Such an anode uncoated portion may protrude toward the top of the electrode assembly 120 . That is, the positive electrode uncoated portion of the positive electrode plate 121 may protrude more upward than the negative electrode plate 122 and the separator 123 .
- the negative electrode plate 122 may include a negative electrode collector plate, which is a plate-shaped metal foil made of copper (Cu) or nickel (Ni), and a negative electrode active material such as graphite or carbon coated on at least one surface of the negative electrode collector plate.
- the negative electrode plate 122 may include a negative electrode uncoated portion on a lower portion of which the negative electrode active material is not coated. Such a cathode uncoated portion may protrude toward the lower side of the electrode assembly 120 . That is, the negative electrode uncoated portion of the negative electrode plate 122 may protrude more downward than the positive electrode plate 121 and the separator 123 .
- the separator 123 may be polyethylene (PE) or polypropylene (PP), but is not limited thereto in the present disclosure.
- the separator may prevent an electrical short between the positive electrode plate 121 and the negative electrode plate 122 and allow only the movement of lithium ions.
- the positive current collector plate 130 may be a circular metal plate having a shape corresponding to the upper surface of the electrode assembly 120 .
- a planar size of the positive current collector plate 130 may be equal to or smaller than the size of the upper surface of the electrode assembly 120 .
- the positive current collector 130 may be made of aluminum (Al).
- the positive current collector plate 130 may be fixed and electrically connected to the positive electrode plate 121 exposed on the upper side of the electrode assembly 120 by welding in a state where the lower surface is in contact with the upper surface of the electrode assembly 120 .
- the positive current collector plate 130 may be fixed and electrically connected to the rivet terminal 150 by welding in a state in which the upper surface is in contact with the lower surface of the rivet terminal 150 .
- the positive current collector plate 130 serves as a passage for current flow between the positive plate 121 of the electrode assembly 120 and the rivet terminal 150 .
- the negative current collector plate 140 may include a circular electrode welded portion 141 corresponding to the lower surface of the electrode assembly 120, a rigidity reinforcement portion 142 provided at an edge of the electrode welded portion 141 and similarly corresponding to the circumference of the lower surface of the electrode assembly 120, and a case welded portion 143 extending downward from the edge of the rigidity reinforcement portion 142.
- the negative current collector 140 may include copper, copper alloy, nickel-plated copper, nickel, nickel alloy, steel, steel alloy, aluminum, or aluminum alloy.
- Upper surfaces of the electrode welding part 141 and the rigidity reinforcing part 142 may come into contact with the lower surface of the electrode assembly 120 .
- the upper surfaces of the electrode welding part 141 and the rigid reinforcement part 142 are welded while in contact with the lower surface of the electrode assembly 120 to the negative electrode plate 122 exposed to the lower part of the electrode assembly 120. Can be fixed and electrically connected.
- the case welding part 143 may be bent downward along the edge of the rigidity reinforcement part 142 .
- the negative current collector plate 140 may be seated on the lower flat portion 113b of the beading portion 113 and electrically/mechanically coupled to each other.
- the case welding part 143 may contact both the connection part 113c of the beading part 113 and the inner surface of the lower flat part 113b.
- the inner surface may be an inner surface of the cylindrical case 110 .
- the case welding portion 143 may have an end portion located below the lower flat portion 113b of the beading portion 113 .
- the case welding part 143 may be welded in a state of being in contact with the inner surface of the lower flat part 113b of the beading part 113 to be fixed and electrically connected to the cylindrical case 110 . Accordingly, the negative electrode current collector 140 serves as a current flow path between the negative electrode plate 122 of the electrode assembly 120 and the cylindrical case 110 .
- Welding of the case welding part 143 and the beading part 113 may be performed in the direction of the case welding part 143 in a state where the negative current collector plate 140 is seated under the beading part 113 before the crimping part 114 of the cylindrical case 110 is provided.
- welding of the case welding part 143 and the beading part 113 may be performed after the cylindrical case 110 is sealed, and then the case welding part 143 may be welded through the beading part 113 from the outside of the cylindrical case 110.
- the second gasket 170 may further include a groove in an area corresponding to the welded portion.
- the rivet terminal 150 may be inserted into the terminal hole 111a provided in the upper surface portion 111 of the cylindrical case 110 and electrically connected to the positive current collector plate 130 .
- the rivet terminal 150 may be made of the same or similar material as the positive electrode collector plate 130 and the positive electrode plate 121 .
- a diameter of a portion exposed to an upper portion of the cylindrical case 110 and a diameter positioned inside the cylindrical case 110 may be larger than a diameter positioned in the terminal hole 111a.
- the upper part of the rivet terminal 150 exposed to the upper part of the cylindrical case 110 is located inside the cylindrical case 110 and the part facing the electrode assembly 120 is referred to as the lower end of the rivet terminal 150.
- the upper end is compressed and deformed (compression molding) by a processing method such as pressing or spinning. It can be in close contact with the upper surface portion 111.
- a first gasket 111b is interposed between the rivet terminal 150 and the terminal hole 111a to electrically insulate and seal the rivet terminal 150 and the cylindrical case 110 .
- the rivet terminal 150 may be electrically connected to the positive plate 121 of the electrode assembly 120 through the positive current collector plate 130 .
- the cap plate 160 is a circular metal plate and may be coupled to the lower end of the cylindrical case 110 .
- the cap plate 160 is coupled to the lower end of the cylindrical case 110 with the second gasket 170 interposed therebetween, and can prevent electrical connection with the cylindrical case 110 . Since the cap plate 160 is not electrically connected to the anode or cathode of the electrode assembly 120, there may be no separate electrical polarity.
- the cap plate 160 may be fixed by providing the crimping portion 114 at the lower end of the cylindrical case 110 while the edge is seated under the lower flat portion 113b of the beading portion 113 of the cylindrical case 110. In this case, the cap plate 160 of the cylindrical case 110 may be seated on the beading portion 113 in a state in which the open lower part faces the upper part.
- the cap plate 160 may be seated under the lower flat portion 113b of the cylindrical case 110 with the second gasket 170 interposed therebetween. Thereafter, the crimping portion 114 of the cylindrical case 110 is bent inward of the cap plate 160 to press the second gasket 170, thereby coupling the cap plate 160 and the cylindrical case 110 together.
- the end of the negative current collector plate 140 is positioned on the lower flat portion 113b of the beading portion 113, the cap plate 160 and the cylindrical case 110 can be more easily sealed with the second gasket 170 interposed therebetween.
- the end of the negative current collector 140 extends beyond the lower flat part 113b of the beading part 113, when the crimping part 114 presses the second gasket 170 to seal between the cap plate 160 and the cylindrical case 110, the end of the negative current collector 140 may be broken or broken. Therefore, sealing between the cap plate 160 and the cylindrical case 110 may not be easy.
- the cap plate 160 may include at least one protrusion 161 protruding downward.
- the protruding portion 161 of the cap plate 160 may be spaced apart from the center and protrude downward to have a ring shape on a plane.
- the protruding portion 161 of the cap plate 160 may protrude downward to have a plurality of patterns.
- the cap plate 160 may include a protrusion 161 to support internal pressure of the cylindrical case 110 .
- the lower surface of the protruding portion 161 of the cap plate 160 may be positioned higher than the lower surface of the crimping portion 114 of the cylindrical case 110 .
- the crimping portion 114 of the cylindrical case 110 may protrude more downward than the protruding portion 161 of the cap plate 160 . Accordingly, when the secondary battery 100 is placed on a flat surface, the crimping portion 114 of the cylindrical case 110 may contact the surface, and the protruding portion 161 of the cap plate 160 may be spaced apart from the surface. In addition, since the crimping portion 114 of the cylindrical case 110 protrudes more downward than the protruding portion 161 of the cap plate 160, even if the cap plate 160 expands due to the internal pressure of the cylindrical case 110, the cap plate 160 can be prevented from touching one surface. Accordingly, the secondary battery 100 can maintain the entire floor height even when the internal pressure of the cylindrical case 110 increases.
- a notch 162 is provided so that the cap plate 160 can be opened at a set pressure.
- the notch 162 is broken to prevent the secondary battery 100 from exploding. That is, when excessive internal pressure is generated inside the cylindrical case 110, the notch 162 is broken, so that the excessive internal pressure can be discharged.
- the notch 162 of the cap plate 160 may be provided to have a ring shape on a plane and spaced apart from the center.
- the notch 162 may be provided to have a plurality of patterns, and the shape of the notch 162 is not limited in the present disclosure.
- the notch 162 may be provided to be spaced apart from the protrusion 161 .
- the notch 162 may be provided in a concave portion 163 that is concave in the direction of the cylindrical case 110 relative to the protrusion 161 since the protrusion 161 is not provided in the cap plate 160 . Since the cap plate 160 is provided with irregularities by the concave portion 163 and the protruding portion 161 , it can withstand the internal pressure even when the internal pressure of the cylindrical case 110 increases.
- the second gasket 170 may be made of a resin material such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET).
- PE polyethylene
- PP polypropylene
- PET polyethylene terephthalate
- the second gasket 170 may pressurize and seal between the cap plate 160 in the cylindrical case 110 and prevent the cap plate 160 from being separated from the cylindrical case 110 .
- both the negative electrode and the positive electrode are provided on the upper surface of the secondary battery 100, when electrically connecting the plurality of secondary batteries 100 through the bus bar, only the upper surface needs to be connected, thereby simplifying the bus bar connection structure.
- the current collector plate 140 welded to the case 110 and the electrode assembly 120 respectively, includes an electrode welded portion 141 welded to the electrode assembly 120, a rigidity reinforcing portion 142 provided outside the electrode welded portion 141, and a case welded portion 143 provided outside the rigidity reinforcing portion 142 and welded to the case 110.
- the electrode welding portion 141 may further include a through hole 1411 provided in a region corresponding to the center of the electrode assembly 120 and/or the cap plate 160 .
- the through hole 1411 allows electrolyte to be well injected into the electrode assembly 120 during the manufacturing process of the secondary battery 100 .
- an upper surface of the current collector plate 140 is substantially flat, but a lower surface of the current collector plate 140 may not be flat.
- the thickness of the rigid reinforcement part 142 and/or the case welding part 143 may be thicker than the thickness of the electrode welding part 141 . Accordingly, the rigidity of the current collector plate 140 may be reinforced by the rigidity reinforcement part 142 and/or the case welding part 143 .
- the thickness of the electrode welded portion 141 may be smaller than the thickness of the rigidity reinforcement portion 142 and/or the case welded portion 143 . Therefore, welding between the electrode welding part 141 and the electrode assembly 120 can be performed relatively easily.
- the current collector plate 140 may further include a bent notch 1421 provided along a boundary between the electrode welded portion 141 and the rigidity reinforcement portion 142 .
- the vent notch 1421 may be provided on a lower surface of the current collector plate 140 . Accordingly, when the secondary battery 100 thermally runs away, the vent notch 1421 is broken and opened, so that the internal gas can be released to the outside more quickly.
- case welded portion 143 may extend and bend from the rigid reinforcement portion 142 toward the cap plate 160, and the case welded portion 143 may be welded to the beading portion 113 of the case 110.
- the outer diameter of the current collector 140 may be larger than that of the electrode assembly 120 . Accordingly, when the current collector plate 140 is coupled to the case 110, it may be coupled in an interference fit manner. In some examples, after the current collector plate 140 is coupled to the case 110 in an interference fit manner, during a process of providing the beading portion 113, the case welded portion 143 of the current collecting plate 140 may be deformed along the contour of the beading portion 113.
- the present disclosure can provide a secondary battery 100 in which the current collector plate 140 can make strong electrical/mechanical contact with the case 110 by the current collector plate 140 having a larger outer diameter than the outer diameter of the electrode assembly 120.
- unwanted deformation of the case 110 can be prevented by the current collector 140 during the beading and curling processes of the case 110 . That is, since the thickness of the current collector 140 (particularly, the thickness of the rigidity reinforcement part 142 and the case weld part 143) is provided thick, the current collector plate 140 supports the contact area with the case 110, and thus, the phenomenon that the case 110 is crushed or asymmetrically deformed during the beading and curling processes can be suppressed.
- the thickness of the current collector plate 140 (particularly, the thickness of the electrode welding portion 141) is relatively thin, so that weldability with the electrode assembly 120 can be improved.
- the operation of the vent notch 1421 during thermal runaway of the secondary battery 100 can quickly discharge the internal gas to the outside, and the injection time of the electrolyte can be shortened due to the through hole 1411 in the center.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
Claims (9)
- 전극 조립체;상기 전극 조립체를 수용하는 케이스;상기 전극 조립체 및 상기 케이스에 각각 용접되는 집전판; 및상기 집전판 상에 위치되어 상기 케이스를 밀폐하는 캡 플레이트를 포함하는, 이차 전지.
- 제1항에 있어서,상기 집전판은상기 전극 조립체에 용접되는 전극 용접부;상기 전극 용접부의 외측에 제공되는 강성 보강부; 및상기 강성 보강부의 외측에 제공되어 상기 케이스에 용접되는 케이스 용접부를 포함하는, 이차 전지.
- 제2항에 있어서,상기 전극 용접부는 상기 캡 플레이트의 중앙과 대응되는 영역에 제공되는 관통홀을 더 포함하는, 이차 전지.
- 제2항에 있어서,상기 전극 용접부의 두께에 비해 상기 강성 보강부 또는 상기 케이스 용접부의 두께가 더 두꺼운, 이차 전지.
- 제2항에 있어서,상기 전극 용접부와 상기 강성 보강부의 경계를 따라 제공되는 벤트 노치를 더 포함하는, 이차 전지.
- 제2항에 있어서,상기 케이스 용접부는 상기 강성 보강부로부터 상기 캡 플레이트를 향하여 절곡된, 이차 전지.
- 제2항에 있어서,상기 케이스 용접부는 상기 케이스의 비딩부에 용접되는, 이차 전지.
- 제2항에 있어서,상기 케이스 용접부와 상기 캡 플레이트의 사이에 개재된 절연 가스켓을 더 포함하는, 이차 전지.
- 제1항에 있어서,상기 집전판의 외경은 상기 전극 조립체의 외경보다 큰, 이차 전지.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202280089368.2A CN118575357A (zh) | 2022-01-19 | 2022-09-14 | 二次电池 |
| US18/702,742 US20250233160A1 (en) | 2022-01-19 | 2022-09-14 | Secondary battery |
| EP22922313.6A EP4468506A4 (en) | 2022-01-19 | 2022-09-14 | SECONDARY BATTERY |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2022-0007827 | 2022-01-19 | ||
| KR1020220007827A KR102571628B1 (ko) | 2022-01-19 | 2022-01-19 | 이차 전지 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023140454A1 true WO2023140454A1 (ko) | 2023-07-27 |
Family
ID=87348853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2022/013723 Ceased WO2023140454A1 (ko) | 2022-01-19 | 2022-09-14 | 이차 전지 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250233160A1 (ko) |
| EP (1) | EP4468506A4 (ko) |
| KR (2) | KR102571628B1 (ko) |
| CN (1) | CN118575357A (ko) |
| WO (1) | WO2023140454A1 (ko) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10727457B2 (en) | 2014-01-15 | 2020-07-28 | Lat Enterprises, Inc. | System for supplying power to a portable battery using at least one solar panel |
| US11025076B2 (en) | 2014-10-16 | 2021-06-01 | Lat Enterprises, Inc. | Portable power case with lithium iron phosphate battery |
| KR20250151721A (ko) * | 2024-04-15 | 2025-10-22 | 삼성에스디아이 주식회사 | 이차전지 |
| WO2025220847A1 (ko) * | 2024-04-16 | 2025-10-23 | 삼성에스디아이(주) | 이차전지 및 이를 갖는 배터리 팩 |
| KR20250155926A (ko) * | 2024-04-24 | 2025-10-31 | 삼성에스디아이 주식회사 | 이차 전지 |
| KR20250178092A (ko) * | 2024-06-18 | 2025-12-26 | 삼성에스디아이 주식회사 | 이차 전지 및 이를 포함하는 전지 팩 |
| WO2026010333A1 (ko) * | 2024-07-05 | 2026-01-08 | 주식회사 엘지에너지솔루션 | 배터리, 배터리 팩 및 이를 포함하는 자동차 |
| USD1102368S1 (en) * | 2024-07-05 | 2025-11-18 | Shenzhen Oriental Willing New Energy Co., Ltd | Rechargeable battery |
| USD1119759S1 (en) * | 2024-09-06 | 2026-03-24 | Ningbo Takenow Technology Co., Ltd. | Battery |
| KR20260037905A (ko) * | 2024-09-11 | 2026-03-18 | 삼성에스디아이 주식회사 | 이차전지 |
| WO2026079939A1 (ko) * | 2024-10-11 | 2026-04-16 | 삼성에스디아이 주식회사 | 이차 전지 및 이를 포함하는 전지 팩 |
| WO2026081223A1 (zh) * | 2024-10-18 | 2026-04-23 | 宁德时代新能源科技股份有限公司 | 圆柱电池单体、电池装置及用电装置 |
| CN119368917B (zh) * | 2024-10-31 | 2025-12-30 | 深圳市联赢激光股份有限公司 | 一种高速高效的密封钉焊接设备及其应用方法 |
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| US20120077062A1 (en) * | 2009-04-15 | 2012-03-29 | Johnson Controls - Saft Advanced Power Solutions Llc | Vent for electrochemical cell |
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| JP4346637B2 (ja) * | 2006-11-24 | 2009-10-21 | 日立ビークルエナジー株式会社 | 円筒型二次電池 |
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2022
- 2022-01-19 KR KR1020220007827A patent/KR102571628B1/ko active Active
- 2022-09-14 EP EP22922313.6A patent/EP4468506A4/en active Pending
- 2022-09-14 WO PCT/KR2022/013723 patent/WO2023140454A1/ko not_active Ceased
- 2022-09-14 US US18/702,742 patent/US20250233160A1/en active Pending
- 2022-09-14 CN CN202280089368.2A patent/CN118575357A/zh active Pending
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2023
- 2023-08-23 KR KR1020230110498A patent/KR20230129318A/ko active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4468506A1 (en) | 2024-11-27 |
| KR20230111854A (ko) | 2023-07-26 |
| KR20230129318A (ko) | 2023-09-08 |
| CN118575357A (zh) | 2024-08-30 |
| EP4468506A4 (en) | 2026-04-08 |
| KR102571628B1 (ko) | 2023-08-28 |
| US20250233160A1 (en) | 2025-07-17 |
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