WO2023146069A1 - 이차전지 - Google Patents
이차전지 Download PDFInfo
- Publication number
- WO2023146069A1 WO2023146069A1 PCT/KR2022/017044 KR2022017044W WO2023146069A1 WO 2023146069 A1 WO2023146069 A1 WO 2023146069A1 KR 2022017044 W KR2022017044 W KR 2022017044W WO 2023146069 A1 WO2023146069 A1 WO 2023146069A1
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- WO
- WIPO (PCT)
- Prior art keywords
- plate
- current collector
- electrode assembly
- sub
- connection
- 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.)
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
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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
- 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
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/647—Prismatic or flat cells, e.g. pouch 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular 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
- H01M50/528—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
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- 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
- H01M50/536—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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- 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
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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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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- 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
- a secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be charged.
- a low-capacity secondary battery in which one battery cell is packaged in a pack form, it is used in small portable electronic devices such as mobile phones and camcorders.
- a large-capacity secondary battery module in units of battery packs in which dozens of battery packs are connected, it is widely used as a power source for driving motors such as hybrid vehicles and electric vehicles.
- a secondary battery may be configured by embedding a laminated or wound electrode assembly and an electrolyte in a case with a separator interposed between the positive electrode plate and the negative electrode plate, and installing a cap plate in the case.
- the uncoated tab protrudes in a side or upper direction, and a current collecting structure may be connected to the uncoated tab. Since some sections of the welded portion of the current collecting structure are sections where heat is generated, the material of the corresponding portion is designed to be thick in order to solve this problem. This leads to a decrease in the capacity of the electrode assembly, and thus it is necessary to develop a structure for securing cell competitiveness.
- a first current collector and a second current collector having a current collector, a first terminal and a second terminal electrically connected to the first and second current collectors, respectively, the cap plate, and the first current collector and a cap assembly including a second current collector and a plurality of insulating members coupled to at least one of the first terminal portion and the second terminal portion, wherein the first current collector includes the first current collector and the first substrate tab.
- the second current collector further includes a sub-plate electrically connecting the second current collector and the second substrate tab, wherein the first current collector and the second base plate are electrically connected to each other.
- a part or all of at least one of the sub-plates of the current collector is a material having lower resistance than the first current collector or the second current collector.
- the first current collector further includes a connection plate electrically connected to the first current collector and having one end bent in a direction of the first substrate tab, wherein the sub-plate is electrically connected to the connection plate and the first substrate tab.
- the second current collector further includes a connection plate electrically connected to the second current collector and having one end bent in a direction of the second substrate tab, wherein the sub-plate comprises the connection plate and the second current collector. It is characterized by being electrically connected to the substrate tab.
- the sub-plate of the first current collector includes a first connection part electrically connected to the connection plate and a second connection part electrically connected to the first substrate tab
- the sub-plate of the second current collector includes A first connection part electrically connected to the connection plate and a second connection part electrically connected to the second substrate tab may be included.
- connection part of the one end of the connection plate and the sub-plate, the second connection part and the first base material tab of the first current collector, and the second connection part and the second base material tab of the second current collector are mutually connected to each other. It is characterized by being welded.
- a heating prevention part is provided between the welding spot of the first connection part and the first welding spot adjacent to the first connection part of the second connection part.
- the heat preventing part is characterized in that a material having lower resistance than the first current collector or the second current collector is plated or clad metal.
- connection plate and the sub-plate is disposed closer to the bottom surface of the case than to the top of the electrode assembly.
- the second connection part is characterized in that the plate surface facing the electrode assembly is disposed on the same plane as the plate surface of the connection plate facing the electrode assembly.
- the second connection part is characterized in that the plate surface facing the electrode assembly is disposed closer to the electrode assembly than the plate surface of the connection plate facing the electrode assembly.
- the second connecting portion is characterized in that a welding groove is formed concavely on the plate surface facing the case.
- the thickness of the first current collector or the second current collector is thicker than that of the connection plate and the sub-plate.
- an embodiment of the present invention is an electrode assembly; a case accommodating the electrode assembly; a cap assembly coupled to the case, electrically connected to the electrode assembly, and including a first current collector disposed parallel to an upper end of the electrode assembly and a second current collector, wherein the cap assembly includes the first current collector; It further includes a pair of sub-plates electrically connecting the current collector and the second current collector to the electrode assembly, respectively, wherein at least one of the sub-plates has a resistance lower than that of the first current collector or the second current collector. It is characterized by the material it has.
- the cap assembly includes a cap plate coupled to the case; a first current collector having the sub-plate electrically connected to a first substrate tab provided on the first electrode plate of the electrode assembly, and a connection plate electrically connected to the first current collector and the sub-plate; a second current collector having the sub-plate electrically connected to a second substrate tab provided on the second electrode plate of the electrode assembly, and a connection plate electrically connected to the second current collector and the sub-plate; a first terminal unit having a first terminal pin coupled to and electrically connected to the first current collector and a first terminal plate coupled to and electrically connected to the first terminal pin; a second terminal unit having a second terminal pin coupled to and electrically connected to the second current collector, a second terminal plate coupled to and electrically connected to the second terminal pin, and a conductive plate; And between the cap plate and the first current collector, between the first current collector and the electrode assembly, between the second current collector and the electrode assembly, between the first terminal pin and the second terminal pin and the electrode assembly.
- An insulating member made of an
- connection plate is characterized in that one end is disposed parallel to the first current collector or the second current collector and the other end is bent toward the electrode assembly, and the sub-plate is welded to the bent end.
- the sub plate may include a first connection portion welded to the connection plate and a second connection portion bent toward the electrode assembly from the first connection portion and electrically connected to the electrode assembly.
- the heat preventing part is characterized in that the low-resistance material is plated or clad metal.
- FIG. 3 is a cross-sectional view of the secondary battery according to FIG. 1 .
- FIG. 4 is an enlarged cross-sectional view of a main part of FIG. 3 .
- 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 limited by these terms. It is self-evident that 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 invention.
- FIG. 1 is a perspective view showing a secondary battery according to an embodiment of the present invention.
- FIG. 2 is an exploded perspective view illustrating a cap assembly of the secondary battery according to FIG. 1 .
- 3 is a cross-sectional view of the secondary battery according to FIG. 1 .
- FIG. 4 is an enlarged cross-sectional view of a main part of FIG. 3 .
- the secondary battery 10 includes an electrode assembly 100, a case 200 accommodating the electrode assembly 100, and a case 200.
- a coupled cap assembly 300 may be included.
- the electrode assembly 100 is a unit stack composed of a thin or film-shaped first electrode plate 110 and a second electrode plate 120, and a separator 130 interposed therebetween. Or it may be provided with a plurality of stacked (stacked).
- the winding shaft may be disposed in a horizontal direction substantially parallel to the length direction of the cap assembly 300 or in a vertical direction substantially perpendicular to the length direction of the cap assembly 300 .
- long side surfaces of a plurality of unit stacks may be arranged to be adjacent to each other.
- the first electrode plate 110 may serve as a cathode and the second electrode plate may serve as an anode. Or vice versa.
- the second electrode plate 120 When the second electrode plate 120 is a positive electrode plate, the second electrode plate 120 may be formed by coating a second electrode active material such as a transition metal oxide on a second electrode current collector made of a metal foil such as aluminum or aluminum alloy.
- a second substrate tab (or second uncoated area), which is an area where the second electrode active material is not applied, may be formed on the second electrode plate 120 .
- the tack-welded second substrate tabs 122 and the cap assembly 300 may be electrically connected. That is, the second substrate tab 122 may serve as a passage for current flow between the second electrode plate 120 and the second terminal portion 360 of the cap assembly 300 .
- the first substrate tab 112 and the second substrate tab 122 are used to form the first electrode plate 110 and the second electrode when the first electrode plate 110 and the second electrode plate 120 are manufactured. It may be formed by cutting one side of the plate 120, respectively. That is, the first substrate tab 112 may be integrally formed with the first electrode plate 110 , and the second substrate tab 122 may be integrally formed with the second electrode plate 120 .
- the first substrate tab 112 may be disposed in one direction of the electrode assembly 100 and the second substrate tab 122 may be disposed in the other direction of the electrode assembly 100 . For example, as shown in FIG. 2 , the first substrate tab 112 is disposed toward the left short side surface of the case 200, and the second substrate tab 122 is disposed toward the right short side surface of the case 200.
- the separator 130 is disposed between the first electrode plate 110 and the second electrode plate 120 to prevent a short circuit and enable the movement of lithium ions.
- the separator 130 may include polyethylene, polypropylene, or a composite film of polyethylene and polypropylene.
- the separator 130 may be replaced with an inorganic solid electrolyte such as a sulfide, oxide, or phosphate compound that does not require a liquid or gel electrolyte.
- the case 200 may have a substantially rectangular parallelepiped box shape, and may have an open upper portion in a longitudinal direction and an accommodation space formed therein.
- the electrode assembly 100 and the electrolyte may be accommodated inside the case 200 through the open top.
- Some components of the cap assembly 300 may be exposed to the outside of the case 200, and some components may be accommodated inside the case 200.
- the case 200 may be composed of a rectangular bottom surface 210 and four side surfaces connected to the bottom surface 210 . Among the side surfaces, a side having a relatively large area is defined as a long side portion 220, and a side having a relatively small area is defined as a short side portion 230.
- the electrode assembly 100 may be disposed so that the plate surface faces the long side portion 220 .
- the cap assembly 300 is coupled to the case 200 and electrically connected to the electrode assembly 100 .
- an insulating film 240 may be coupled or attached to the short side portion 230 of the case 200 to insulate the current collector.
- the cap assembly 300 includes a cap plate 310 coupled to the case 200, a plurality of insulating members, a first current collector 330 and a second current collector ( 340), a first terminal unit 350 and a second terminal unit 360 may be included.
- the insulating plate 322 has a substantially rectangular plate shape.
- the insulating plate 322 comes into close contact with the lower surface of the cap plate 310 to insulate between the cap plate 310 and the electrode assembly 100 .
- the insulating plate 322 serves to insulate between the cap plate 310 and a current collecting structure to be described later.
- the insulating plate 322 may have a side surface extending downward along the edge.
- the side surface may have a shape connecting the entire edge of the insulating plate 322 or may be formed only partially.
- the shape of the plate surface or side of the insulation plate 322 may vary according to the shape of components requiring insulation.
- a through hole 322a may be formed in the insulation plate 322 to correspond to positions of the terminal hole 312 and the vent hole 314 of the cap plate 310 .
- a portion of the current collector and a lower insulation portion 324 may be disposed under the insulation plate 322 .
- the lower insulating part 324 is for insulating some components of the current collecting part and has a substantially rectangular plate shape.
- the lower insulating parts 324 may be provided as a pair and may be respectively disposed on the side of the first terminal part 350 and the second terminal part 360 .
- the lower insulation part 324 is disposed below the current collectors 332 and 342 to be described later, and may be formed in a size capable of substantially covering the current collectors 332 and 342 .
- the lower insulating part 324 may be coupled to the insulating plate 322 in a state in which the current collectors 332 and 342 are assembled.
- the pin insulating portion 326 serves to insulate between the terminal pins 352 and 362 of the first terminal portion 350 and the second terminal portion 360 and the cap plate 310, which will be described later, and has a substantially cylindrical shape.
- the upper insulator 328 includes a flange 326a extending outward from an upper end of the outer circumferential surface. The flange 326a contacts a lower portion of one side of the terminal pins 352 and 362 , and a lower end of the upper insulating portion 328 is inserted into the through hole 322a of the insulating plate 322 .
- the upper insulating part 328 is applied only to the first terminal part 350 and is disposed between the first terminal plate 354 and the cap plate 310 to be described later.
- the upper insulating portion 328 may have a rectangular plate shape substantially corresponding to the shape of the first terminal plate 354 .
- the upper insulating portion 328 is formed to be larger than the first terminal plate 354 and has a groove in which the first terminal plate 354 is seated.
- a hole is formed through the upper insulating part 328 at a position corresponding to the terminal hole 312 of the cap plate 310 .
- the flange 352a of the first terminal pin 352 is disposed in the through hole.
- the first current collector 332 is made of a conductive material having a predetermined thickness and may have a substantially plate shape. In addition, the first current collector 332 has a plate shape without a bent or bent portion.
- a through hole 332a is formed through the first current collector 332 at a position corresponding to the terminal hole 312 of the cap plate 310 and the through hole 322a of the insulating plate 322 .
- a first terminal pin 352 to be described later is inserted into the through hole 332a.
- a portion of the upper surface of the first current collector 332 contacts the lower surface of the insulating plate 322 , and the lower surface is insulated from the electrode assembly 100 by the lower insulating part 324 .
- connection plate 334 is a conductive material having a relatively smaller thickness than the first current collector 332 and may have a shape obtained by bending a plate shape substantially vertically. Based on the bent portion of the connecting plate 334, the upper side is defined as the upper side, and the downwardly extending portion is defined as the lower side.
- the lower surface of the upper part of the connection plate 334 is seated in the seating groove 332b formed on the upper surface of the first current collector 332, and the upper surface of the upper part adheres to the lower surface of the insulating plate 322.
- An outer surface of the lower portion of the connection plate 334 is in contact with one side of the sub plate 336 .
- connection plate 334 When the first current collector 332 is fixed while the connection plate 334 is seated on the first current collector 332, the connection plate 334 is also positioned between the insulating plate 322 and the first current collector 332. can be fixed Accordingly, the connection plate 334 may be physically and electrically connected to the first current collector 332 without separate welding. Alternatively, the connection plate 334 may be connected to the first current collector 332 by laser welding. The connection plate 334 and the sub plate 336 may be connected by laser welding or the like. In order to prevent damage to the insulation plate 322 during welding, the lower end of the connection plate 334 is disposed at a position lower than the upper end of the electrode assembly 100, and the welding portion is also formed adjacent to the lower end of the connection plate 334. (placed closer to the bottom of the case).
- the sub-plate 336 is made of a conductive material having a predetermined width and length, and may have a substantially plate shape. One end (upper end) of the sub plate 336 may be welded in contact with the lower portion of the connection plate 334 .
- the first substrate tab 112 is formed on the inner side. This can be connected.
- a portion where the sub plate 336 is connected to the connection plate 334 may be defined as a first connection portion 336a, and a portion connected to the first substrate tab 112 may be defined as a second connection portion 336b.
- the first connection portion 336a and the second connection portion 336b may be bent at a predetermined angle.
- the second connection portion 336b may be disposed such that an inner surface is bent toward the electrode assembly 100 from the first connection portion 336a and positioned on the same plane as the inner surface of the connection plate 334 .
- the inner surface of the second connection portion 336b may be disposed to enter the electrode assembly 100 more than the inner surface of the connection plate 334 .
- the inner surface of the second connection portion 336b may be connected to the first substrate tab 112 by welding. Therefore, the vertical length of the second connection portion 336b may correspond to or be slightly larger than the vertical length of the first substrate tab 112 .
- connection plate 334 and the sub-plate 336 are welded, and the sub-plate 336 and the first substrate tab 112 (or the second substrate tab) are welded.
- Heat generation occurs between the first welding spots to be formed. Since this part has high resistance due to welding and shape features (bending), it is a part inevitably generating heat.
- a low resistance material may be plated on the connection plate 334 and the sub plate 336 described above. Alternatively, a low-resistance material may be plated only on the sub plate 336 .
- 'low-resistance material' refers to a material having a relatively lower resistance than the material of the first current collector 332 or the second current collector 342 . Therefore, in this embodiment, all materials having lower resistance than copper or aluminum may be applied to the 'low-resistance material'. By plating the low-resistance material, an effect of lowering resistance occurs, and thus heat generation can be improved.
- the low-resistance material may be silver or gold.
- heat preventing units 336d and 346d may be provided at the above-described heating portion (hereinafter, referring to FIG. 4 , for convenience, based on the heat preventing unit 336d on the first terminal side
- the second terminal side heat protection unit 346d also has the same characteristics).
- the heat preventing part 336d may have a size and shape corresponding to a region where heat is generated. Accordingly, the heat preventing portion 336d may have a bent thin plate shape corresponding to the shape of the bent portion of the sub plate 336 and its surroundings. Illustratively, the heat preventing portion 336d may cover a heat generating portion but have a width smaller than that of the sub plate 336 and may be in the form of a thin plate plated with a low-resistance material. To form the heat preventing part 336d, a groove to which the heat preventing part 336d is fixed may be formed in the sub plate 336. Alternatively, the heat preventing unit 336d may be made of clad metal.
- Clad metal is obtained by fusing two or more different types of metals or alloys by a method such as hot pressing.
- the anti-heating part 336d is a clad metal, after forming the clad metal with the low-resistance material described above, the anti-heating part 336d may be formed by a method such as adhesion, fusion, or hot compression.
- the first terminal unit 350 may include a first terminal pin 352 and a first terminal plate 354 .
- the first terminal unit 350 may further include a fixing plate 356 for fixing the first terminal pin 352 as needed.
- the first terminal pin 352 has a substantially cylindrical shape and is electrically connected to the first electrode plate 110 of the electrode assembly 100 by being electrically connected to the first current collector 332 .
- a flange 352a Adjacent to the upper end of the first terminal pin 352, a flange 352a is provided on which the first terminal plate 354 is seated.
- the flange 352a extends outward from the outer circumferential surface of the first terminal plate 354 in a vertical direction. Upper and lower surfaces of the flange 352a may be substantially parallel to the cap plate 310 .
- a part of the lower surface of the first terminal plate 354 may contact the upper surface of the flange 352a, and the upper surface of the flange 326a of the pin insulating part 326 may contact the lower surface of the flange 352a.
- the pin insulation part 326 is inserted into the cap plate 310 during manufacturing, the lower portion of the first terminal pin 352 is formed by the upper insulation part 328, the cap plate 310, the insulation plate 322 and the first terminal pin 352. 1 may be inserted through the current collector 332 sequentially.
- the first terminal plate 354 is seated on the top of the flange 352a, and the upper and lower ends of the first terminal pin 352 are pressed and deformed to form the first terminal pin 352 and the first terminal plate 354.
- the first terminal pin 352 and the first current collector 332 may be fixed.
- the first terminal pin 352 and the first current collector 332 may be fixed by welding a lower end of the first terminal pin 352 and a part of the lower surface of the first current collector 332 .
- the fixing plate 356 may come into close contact with the lower end of the first terminal pin 352, and the fixing plate 356, the lower end of the first terminal pin 352, and the first current collector 332 may be welded together. When the fixing plate 356 is applied, a groove into which the fixing plate 356 is inserted may be formed below the first current collector 332 .
- the second current collector 340 has the same configuration as the first current collector 330, but is disposed symmetrically with the first current collector 330 to form a second electrode plate ( 120) and electrically connected. A detailed description of the second current collector 340 will be omitted.
- the conductive plate 366 electrically connects the second terminal plate 364 electrically connected to the second terminal pin 362 and the cap plate 310 . Accordingly, the cap plate 310 is electrically connected to the second electrode plate 120 because it is connected to the second current collector 340 through the second terminal unit 360 . Accordingly, the cap plate 310 has the same positive polarity as the second current collector 340, and the case 200 welded to the cap plate 310 also has the positive polarity.
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (19)
- 일측이 개구되어 개구부를 형성하는 케이스;상기 케이스에 수용되며, 상기 케이스의 길이 방향 일측으로 배치된 제1 기재탭을 갖는 제1 전극판과, 상기 케이스의 길이 방향 타측으로 배치된 제2 기재탭을 갖는 제2 전극판과, 상기 제1 전극판 및 상기 제2 전극판의 사이에 개재되는 세퍼레이터를 구비하고, 권취 또는 적층되는 전극 조립체; 및상기 케이스의 개구부에 결합되는 캡 플레이트와, 상기 전극 조립체의 길이 방향 상단과 평행하게 배치되고 상기 제1 기재탭 및 상기 제2 기재탭과 각각 전기적으로 연결되는 제1 집전체 및 제2 집전체를 구비한 제1 집전부 및 제2 집전부와, 상기 제1 집전부 및 상기 제2 집전부와 각각 전기적으로 연결되는 제1 단자부 및 제2 단자부와, 상기 캡 플레이트, 제1 집전체 및 제2 집전체, 상기 제1 단자부 및 제2 단자부 중 적어도 하나에 결합되는 복수의 절연부재를 구비한 캡 어셈블리를 포함하고,상기 제1 집전부는 상기 제1 집전체와 상기 제1 기재탭을 전기적으로 연결하는 서브 플레이트를 더 포함하고, 상기 제2 집전부는 상기 제2 집전체와 상기 제2 기재탭을 전기적으로 연결하는 서브 플레이트를 더 포함하며, 상기 제1 집전부 및 상기 제2 집전부의 상기 서브 플레이트 중 적어도 하나는 일부 또는 전부가 상기 제1 집전체 또는 상기 제2 집전체보다 낮은 저항을 갖는 소재인, 이차전지.
- 제 1 항에 있어서,상기 제1 집전부는, 상기 제1 집전체와 전기적으로 연결되고 일단이 상기 제1 기재탭 방향으로 벤딩되는 연결 플레이트를 더 포함하고, 상기 서브 플레이트는 상기 연결 플레이트 및 상기 제1 기재탭과 전기적으로 연결되고,상기 제2 집전부는, 상기 제2 집전체와 전기적으로 연결되고 일단이 상기 제2 기재탭 방향으로 벤딩되는 연결 플레이트를 더 포함하고, 상기 서브 플레이트는 상기 연결 플레이트 및 상기 제2 기재탭과 전기적으로 연결되는, 이차전지.
- 제 2 항에 있어서,상기 제1 집전부의 상기 서브 플레이트는 상기 연결 플레이트에 전기적으로 연결되는 제1 연결부와, 상기 제1 기재탭에 전기적으로 연결되는 제2 연결부를 포함하고, 상기 제2 집전부의 상기 서브 플레이트는 상기 연결 플레이트에 전기적으로 연결되는 제1 연결부와, 상기 제2 기재탭에 전기적으로 연결되는 제2 연결부를 포함하는, 이차전지.
- 제 3 항에 있어서,상기 연결 플레이트의 일단과 상기 서브 플레이트의 상기 제1 연결부, 상기 제1 집전부의 상기 제2 연결부와 상기 제1 기재탭, 상기 제2 집전부의 상기 제2 연결부와 상기 제2 기재탭은 서로 용접되는, 이차전지.
- 제 4 항에 있어서,상기 제1 연결부의 용접 스팟과 상기 제2 연결부의 상기 제1 연결부에 인접한 첫번째 용접 스팟 사이에 발열 방지부가 구비되는, 이차전지.
- 제 5 항에 있어서,상기 발열 방지부는 상기 제1 집전체 또는 상기 제2 집전체보다 낮은 저항을 갖는 소재가 도금되거나 또는 클래드 메탈(clad metal)인 것을 특징으로 하는, 이차전지.
- 제 3 항에 있어서,상기 연결 플레이트와 상기 서브 플레이트의 용접된 부분은 상기 전극 조립체의 상단보다 상기 케이스의 바닥면에 가깝게 배치되는, 이차전지.
- 제 3 항에 있어서,상기 서브 플레이트는 상기 제2 연결부가 상기 제1 연결부로부터 상기 전극 조립체를 향해 벤딩되고, 상기 벤딩된 부분은 상기 전극 조립체의 상단보다 상기 케이스의 바닥면에 가깝게 배치되는, 이차전지.
- 제 8 항에 있어서,상기 제2 연결부는 상기 전극 조립체를 향하는 판면이 상기 연결 플레이트의 상기 전극 조립체를 향하는 판면과 동일 평면상에 배치되는, 이차전지.
- 제 8 항에 있어서,상기 제2 연결부는 상기 전극 조립체를 향하는 판면이 상기 연결 플레이트의 상기 전극 조립체를 향하는 판면보다 상기 전극 조립체 쪽에 가깝게 배치되는, 이차전지.
- 제 9 항 또는 제 10 항에 있어서,상기 제2 연결부는 상기 케이스를 향하는 판면에 오목하게 용접홈이 형성되는, 이차전지.
- 제 2 항에 있어서,상기 제1 집전체 또는 상기 제2 집전체의 두께는 상기 연결 플레이트 및 서브 플레이트의 두께보다 두꺼운, 이차전지.
- 제 12 항에 있어서,상기 제1 집전체 또는 상기 제2 집전체의 두께는 상기 연결 플레이트 및 서브 플레이트의 두께의 4배 내지 5배의 두께인, 이차전지.
- 전극 조립체;상기 전극 조립체를 수용하는 케이스;상기 케이스에 결합되고, 상기 전극 조립체에 전기적으로 연결되고 상기 전극 조립체의 상단과 평행하게 배치되는 제1 집전체를 및 제2 집전체를 구비하는 캡 어셈블리를 포함하고,상기 캡 어셈블리는상기 제1 집전체와 상기 제2 집전체를 각각 상기 전극 조립체와 전기적으로 연결하는 한 쌍의 서브 플레이트를 더 포함하고, 상기 서브 플레이트 중 적어도 하나는 상기 제1 집전체 또는 상기 제2 집전체보다 낮은 저항을 갖는 소재인, 이차전지.
- 제 14 항에 있어서,상기 캡 어셈블리는상기 케이스에 결합되는 캡 플레이트;상기 전극 조립체의 제1 전극판에 구비된 제1 기재탭과 전기적으로 연결되는 상기 서브 플레이트, 상기 제1 집전체와 상기 서브 플레이트에 전기적으로 연결되는 연결 플레이트를 갖는 제1 집전부;상기 전극 조립체의 제2 전극판에 구비된 제2 기재탭과 전기적으로 연결되는 상기 서브 플레이트, 상기 제2 집전체와 상기 서브 플레이트에 전기적으로 연결되는 연결 플레이트를 갖는 제2 집전부;상기 제1 집전체에 결합되어 전기적으로 연결되는 제1 단자핀, 상기 제1 단자핀과 결합되어 전기적으로 연결되는 제1 단자 플레이트를 갖는 제1 단자부;상기 제2 집전체에 결합되어 전기적으로 연결되는 제2 단자핀, 상기 제2 단자핀과 결합되어 전기적으로 연결되는 제2 단자 플레이트 및 전도성 플레이트를 갖는 제2 단자부; 및상기 캡 플레이트와 상기 제1 집전체의 사이, 상기 제1 집전체와 상기 전극 조립체의 사이, 상기 제2 집전체와 상기 전극 조립체의 사이, 상기 제1 단자핀 및 상기 제2 단자핀과 상기 캡 플레이트의 사이에 각각 구비되는 절연 소재의 절연부재를 포함하는, 이차전지.
- 제 15 항에 있어서,상기 연결 플레이트는 일단이 상기 제1 집전체 또는 상기 제2 집전체와 평행하게 배치되고 타단이 상기 전극 조립체를 향해 벤딩되며, 상기 벤딩된 단부에 상기 서브 플레이트가 용접되는, 이차전지.
- 제 16 항에 있어서,상기 서브 플레이트는 상기 연결 플레이트에 용접되는 제1 연결부, 상기 제1 연결부로부터 상기 전극 조립체를 향해 벤딩되고 상기 전극 조립체와 전기적으로 연결되는 제2 연결부를 포함하는, 이차전지.
- 제 17 항에 있어서,상기 제1 연결부의 용접 스팟과 상기 제2 연결부의 상기 제1 연결부에 인접한 첫번째 용접 스팟 사이에 발열 방지부가 구비되는, 이차전지.
- 제 18 항에 있어서,상기 발열 방지부는 상기 저-저항 소재가 도금되거나 또는 클래드 메탈(clad metal)인 것을 특징으로 하는, 이차전지.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP22924323.3A EP4471970A4 (en) | 2022-01-27 | 2022-11-02 | SECONDARY BATTERY |
| US18/284,053 US20240162524A1 (en) | 2022-01-27 | 2022-11-02 | Secondary battery |
| CN202280042998.4A CN117546356A (zh) | 2022-01-27 | 2022-11-02 | 二次电池 |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020220012598A KR20230115756A (ko) | 2022-01-27 | 2022-01-27 | 이차전지 |
| KR10-2022-0012598 | 2022-01-27 |
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| US (1) | US20240162524A1 (ko) |
| EP (1) | EP4471970A4 (ko) |
| KR (1) | KR20230115756A (ko) |
| CN (1) | CN117546356A (ko) |
| WO (1) | WO2023146069A1 (ko) |
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| WO2026038762A1 (ko) * | 2024-08-13 | 2026-02-19 | 주식회사 엘지에너지솔루션 | 이차 전지의 제조 방법, 이차 전지, 이를 포함하는 배터리 모듈, 배터리 팩 및 운송 수단 |
| US20260121250A1 (en) * | 2024-10-24 | 2026-04-30 | Samsung Sdi Co., Ltd. | Secondary battery, method of manufacturing secondary battery, and battery pack |
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- 2022-01-27 KR KR1020220012598A patent/KR20230115756A/ko active Pending
- 2022-11-02 CN CN202280042998.4A patent/CN117546356A/zh active Pending
- 2022-11-02 EP EP22924323.3A patent/EP4471970A4/en active Pending
- 2022-11-02 WO PCT/KR2022/017044 patent/WO2023146069A1/ko not_active Ceased
- 2022-11-02 US US18/284,053 patent/US20240162524A1/en active Pending
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| Publication number | Publication date |
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| KR20230115756A (ko) | 2023-08-03 |
| CN117546356A (zh) | 2024-02-09 |
| US20240162524A1 (en) | 2024-05-16 |
| EP4471970A4 (en) | 2025-10-15 |
| EP4471970A1 (en) | 2024-12-04 |
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