WO2022240156A1 - 이차 전지 - Google Patents
이차 전지 Download PDFInfo
- Publication number
- WO2022240156A1 WO2022240156A1 PCT/KR2022/006691 KR2022006691W WO2022240156A1 WO 2022240156 A1 WO2022240156 A1 WO 2022240156A1 KR 2022006691 W KR2022006691 W KR 2022006691W WO 2022240156 A1 WO2022240156 A1 WO 2022240156A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- case
- current collector
- secondary battery
- tab
- examples
- Prior art date
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- 238000002788 crimping Methods 0.000 claims description 11
- 238000004826 seaming Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 9
- 230000020169 heat generation Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 13
- 238000007789 sealing Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003811 curling process Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
Images
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
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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.
- lithium ion secondary batteries are used as power sources for portable electronic devices as well as hybrid vehicles or electric vehicles because of their high operating voltage and high energy density per unit weight.
- a cylindrical secondary battery includes a cylindrical electrode assembly, a cylindrical case to which the electrode assembly is coupled, an electrolyte solution (optional) injected into the case to enable movement of lithium ions, and an electrolyte solution coupled to one side of the case. It consists of a cap assembly and the like that prevent leakage of the liquid and prevent separation of the electrode assembly.
- the present disclosure provides a secondary battery capable of reducing heat generation and improving safety and reliability by reducing the number of resistance welding regions inside the case of the battery.
- a secondary battery includes an electrode assembly having a first tab and a second tab provided on the opposite side of the first tab; a first collector plate welded on the first tab of the electrode assembly and having a larger diameter than the electrode assembly; and a case accommodating the electrode assembly and the first collector plate, a second collector plate closely attached to the second tab of the electrode assembly, and a terminal portion electrically connected to the second collector plate and penetrating the case. It may include a case assembly that does.
- a support member disposed on the first current collector may be further included.
- a safety vent disposed on the support member and blocking the case may be further included.
- the present disclosure can provide a secondary battery with reduced heat generation and improved safety and reliability by providing only one welding region inside the battery.
- the first current collector plate may include a disc, a plurality of slits provided on the disc and welded to the first tab, and a plurality of extensions extending outward from the disc and coming into close contact with the case.
- the plurality of extensions provided on the first collector plate can be coupled to the case in an interference fit manner, so that the second tab of the electrode assembly and the second collector plate are strongly adhered to each other in a non-welding manner and/or A contacted secondary battery may be provided.
- the extension part may be bent from the original plate and welded to the case.
- the present disclosure can provide a secondary battery in which the mechanical coupling force between the first collector plate and the case is improved and the electrical resistance is reduced.
- the support member may be disposed on the extension part.
- the present disclosure can provide a secondary battery in which the mechanical coupling between the first current collector and the case is improved and electrical resistance is reduced because the support member pushes the extension toward the case.
- the extension part may further include a first gasket interposed between the support member, the case, and the safety vent.
- a spring interposed between the second tab and the second current collecting plate may be further included.
- the present disclosure can provide a secondary battery in which the second tab of the electrode assembly and the second collector plate are elastically adhered and/or contacted, and the mutual adhesion and/or contact force is improved.
- the case may further include a beading portion bent inwardly in an area corresponding to the first current collector plate and a crimping portion bent inwardly and surrounding the first gasket.
- the case may further include a seaming portion bent outward together with the first current collector plate.
- the case may further include a curling portion bent toward the first current collecting plate.
- various sealing structures such as a beading unit, a crimping unit, a seaming unit, and/or a curling unit are provided in a battery, thereby providing a secondary battery with improved sealing power.
- the present disclosure may provide a secondary battery capable of reducing heat generation and improving safety and reliability by reducing the number of resistance welding regions inside the case of the secondary battery.
- FIG. 1A, 1B, and 1C are perspective and cross-sectional views illustrating exemplary secondary batteries according to the present disclosure.
- FIGS. 2A to 2E are diagrams illustrating a manufacturing method of an exemplary secondary battery according to the present disclosure.
- 3A, 3B, and 3C are views illustrating examples of beading/crimping, seaming, and curling for improving sealing power among exemplary secondary batteries 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 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.
- Space-related terms such as “beneath,” “below,” “lower,” “above,” and “upper” are associated with an element or feature shown in a drawing. It can be used for easy understanding of other elements or features. Terminology related to this space is for easy understanding of the present invention according to various process conditions or use conditions of the present invention, and is not intended to limit the present invention. For example, if an element or feature in a figure is turned over, an element or feature described as “lower” or “below” becomes “above” or “above.” Accordingly, “below” is a concept encompassing “upper” or "below”.
- FIG. 1A, 1B, and 1C are perspective and cross-sectional views illustrating an exemplary secondary battery 100 according to the present disclosure.
- the exemplary secondary battery 100 according to the present disclosure includes a cylindrical electrode assembly 110, a negative electrode current collector 120, and a cylindrical case assembly 130.
- the exemplary secondary battery 100 according to the present disclosure may further include a support member 150 and a safety vent 160 .
- the electrode assembly 110 may be provided in a cylindrical shape.
- the electrode assembly 110 includes a negative electrode plate 111 coated with a negative electrode active material (eg, graphite, carbon, etc.), a positive electrode active material (eg, a transition metal oxide (LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , etc.))
- a negative electrode active material eg, graphite, carbon, etc.
- a positive electrode active material eg, a transition metal oxide (LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , etc.)
- the coated positive plate 112 and the separator 113 positioned between the negative plate 111 and the positive plate 112 to prevent a short circuit and to allow only the movement of lithium ions may be included.
- the negative electrode plate 111, the positive electrode plate 112, and the separator 113 may be wound in a substantially cylindrical shape.
- the negative plate 111 may include a copper (Cu) foil
- the negative electrode tab 1111 may be provided with a negative electrode tab 1111 that protrudes and extends a certain length in an upward direction on the negative electrode plate 111, and the positive electrode tab 1121 that protrudes and extends with a predetermined length in a downward direction may be provided on the positive electrode plate 112. It can be, but the opposite is also possible.
- the negative electrode tab 1111 may include copper (Cu), a copper alloy, nickel (Ni), or a nickel alloy, and the positive electrode tab 1121 may include aluminum (Al) or an aluminum alloy.
- the negative electrode tab 1111 may include or be referred to as a first tab, a negative electrode substrate tab, or a negative electrode uncoated portion.
- the positive electrode tab 1121 may include or be referred to as a second tab, a positive electrode substrate tab, or a positive electrode uncoated portion.
- the negative electrode tab 1111 may be electrically connected to the negative electrode current collector 120 by laser welding, and the positive electrode tab 1121 may be mechanically adhered to the positive electrode current collector 133 and/or They can be electrically connected by a contact method.
- the negative current collector 120 may be provided in a substantially circular disk shape. In some examples, the diameter of the negative current collector plate 120 may be similar to or greater than the diameter of the electrode assembly 110 .
- the negative current collector 120 may be provided on the negative electrode tab 1111 of the electrode assembly 110 and may be electrically connected to the negative electrode tab 1111 . In some examples, the negative current collector 120 may be resistance welded, ultrasonic welded, and/or laser welded to the negative electrode tab 1111 . In some examples, the negative current collector 120 may include or be referred to as a first current collector or a negative current collector.
- the negative current collector 120 may include a circular plate 121 , a plurality of slits 1211 , and a plurality of extension portions 122 .
- the original plate 121 may be provided with a plurality of slits 1211 , and the slits 1211 may be laser welded to the negative electrode tab 1111 .
- the slit 1211 may be provided in a straight line shape perpendicular to the circumference of the electrode assembly 110 .
- four slits 1211 may be provided.
- the slit 1211 may be provided in an approximate “+” shape.
- multiple extensions 122 may be provided along the circumference of disc 121 .
- extension 122 may be provided in an approximate crescent shape.
- the extension portion 122 may be bent obliquely from the disk 121 in an upward and outward direction. Accordingly, the plurality of extension parts 122 may come into close contact with the sidewall 1312 of the case 131 .
- extension 122 may be resistance welded, ultrasonic welded, and/or laser welded to sidewall 1312 of case 131 .
- negative current collector plate 120 may include copper, copper alloy, nickel, nickel alloy, or stainless steel. In some examples, the extension 122 of the negative current collector 120 may be in close contact with the sidewall 1312 of the case 131 in a forced press-fitting manner.
- the case assembly 130 may include a case 131 , a positive current collector plate 133 , and a terminal unit 132 .
- case 131 may be provided in a substantially cylindrical shape.
- the case 131 may include a substantially circular bottom portion 1311 and a sidewall 1312 bent upward from the bottom portion 1311 to extend a predetermined length.
- the sidewall 1312 may be divided into a lower region and an upper region, and the diameter of the upper region may be relatively larger than the diameter of the lower region.
- the cylindrical case 131 may include steel, steel alloy, nickel-plated steel, nickel-plated steel alloy, aluminum, or aluminum alloy.
- the negative current collector plate 120 may be directly welded to the sidewall 1312 of the cylindrical case 131 . Accordingly, the cylindrical case 131 may operate as a negative electrode.
- the terminal unit 132 may include a positive current collector plate 133 , a terminal post 134 , and a gasket 135 .
- the positive current collector plate 133 and the terminal pillar 134 may have a compression riveting structure or a compression caulking structure, or may be integrally provided.
- the positive current collector plate 133 and/or the terminal post 134 may include aluminum or an aluminum alloy.
- the terminal post 134 may pass through the bottom portion 1311 of the case 131, and the insulating and sealing gasket 135 is between the through hole of the terminal post 134 and the bottom portion 1311. may be intervened.
- gasket 135 may include or be referred to as a second gasket, an insulating portion, or a sealing portion.
- the positive current collector 133 may be interposed between the positive electrode tab 1121 of the electrode assembly 110 and the terminal unit 132 (positive terminal).
- a spring 170 may be further interposed between the positive current collector 133 and the terminal unit 132 .
- the positive current collector plate 133 may be strongly adhered to the positive electrode tab 1121 by elasticity of the spring 170 without being welded to the positive electrode tab 1121 .
- spring 170 may include or be referred to as a flat spring, elliptical spring, semi-elliptical spring, circular spring, semi-circular spring, or coil spring.
- the conventional anode lead may be omitted, and accordingly, the welding process of the anode lead may also be omitted.
- the positive current collector 133 may include aluminum or an aluminum alloy.
- spring 170 may also include aluminum or an aluminum alloy.
- the support member 150 may be disposed on the negative electrode current collector 120 .
- the support member 150 may be disposed along a boundary between the disc 121 and the extension 122 .
- the diameter of the support member 150 before being disposed on the negative current collector 120 may be larger than the diameter of the original plate 121 . Accordingly, the support member 150 is provided on the negative electrode current collector 120 in a reduced diameter state, and accordingly, the support member 150 maintains a state of pushing the extension portion 122 toward the sidewall 1312. . Thus, contact force between the extension portion 122 and the sidewall 1312 may be increased.
- support member 150 includes, or may be referred to as, a retaining ring, snap ring, or stop ring.
- the safety vent 160 is disposed on the support member 150 and also blocks the upper region of the case 131 .
- the safety vent 160 is provided in a substantially disk shape, and may further include a vent groove 161 provided on an upper or lower surface.
- safety vent 160 may include aluminum or an aluminum alloy.
- a gasket 162 may be further interposed between the extension 122 of the negative current collector 120 , the support member 150 and the case 131 , and the safety vent 160 .
- the gasket 162 prevents the safety vent 160 from electrically/mechanically directly contacting the support member 150 and the case 131, and at the same time, the case 131 is sealed.
- gasket 162 may include or be referred to as a first gasket, an insulating portion, or a sealing portion.
- the upper region of the case 131 may further include a beading portion 1313 and a crimping portion 1314 bent inward to press the gasket 162, , Accordingly, the sealing force of the case 131 may be further increased.
- the welding region exists only between the negative electrode tab 1111 and the negative electrode current collector 120, and does not exist between the positive electrode tab 1121 and the positive electrode current collector 133. don't Therefore, heat generated in the welding area during operation of the secondary battery 100 is reduced. In addition, the safety of the secondary battery 100 is improved due to the reduction of heat generation. In addition, by eliminating the conventional anode lead component, the internal resistance is further reduced.
- 2A to 2E are diagrams illustrating a manufacturing method of an exemplary secondary battery 100 according to the present disclosure.
- 2A is a diagram illustrating an initial stage of manufacturing an exemplary secondary battery 100 according to the present disclosure.
- an electrode assembly 110 may be provided.
- the electrode assembly 110 may be wound into a cylindrical shape after stacking the negative plate 111 , the separator 113 , and the positive plate 112 .
- the electrode assembly 110 may include a negative electrode tab 1111 extending upwardly and a positive electrode tab 1121 extending downwardly.
- FIG. 2B is a diagram illustrating a later stage of manufacturing an exemplary secondary battery 100 according to the present disclosure.
- a negative electrode current collector 120 may be provided.
- the negative current collector 120 may include a disc 121 having a plurality of slits 1211 and a plurality of extension parts 122, and the negative current collector 120 is placed on the negative electrode tab 1111 and then , may be laser welded to the negative electrode tab 1111.
- the slit 1211 of the negative electrode plate 111 may be laser welded to the negative electrode tab 1111 .
- the extension 122 of the negative current collector 120 may protrude from the electrode assembly 110 by a predetermined length.
- the electrode assembly 110 to which the negative current collector plate 120 is welded may be coupled to the case assembly 130 .
- the case assembly 130 may include a case 131, a positive current collector plate 133 and a terminal portion 132, and a spring 170 may be pre-positioned on the positive current collector plate 133. .
- the positive electrode tab 1121 of the electrode assembly 110 may come into contact with the spring 170 .
- spring 150 may include a circular ring shape.
- the extension 122 of the negative current collector 120 may directly contact the upper region (extended region) of the case 131 .
- the extension 122 of the negative current collector 120 may be coupled to the upper region of the case 131 in an interference fit manner.
- the spring 170 between the positive tab 1121 and the positive current collector 133 may be compressed as the negative current collector 120 is forcefully fitted.
- FIG. 2D is a diagram illustrating a later stage of manufacturing an exemplary secondary battery 100 according to the present disclosure.
- a support member 150 may be provided.
- the support member 150 may be fitted onto the negative electrode current collector 120 .
- the support member 150 may be inserted into the boundary between the disc 121 and the extension 122 .
- the support member 150 is provided in the form of an incised circular ring, and the diameter of the support member 150 before coupling may be greater than the diameter of the disk 121 . Therefore, when the support member 150 is coupled to the negative electrode current collector 120 , the extension 122 is pushed toward the sidewall 1312 of the case 131 and receives a force.
- FIG. 2E is a diagram illustrating a later stage of manufacturing an exemplary secondary battery 100 according to the present disclosure.
- a safety vent 160 may be provided.
- a safety vent 160 may be provided on the negative current collector plate 120 and the support member 150 .
- an insulating gasket 162 may be coupled around the safety vent 160 .
- the safety vent 160 is electrically isolated from the case 131 by the insulating gasket 162, and the safety vent 160 and the gaskets 162 and 135 block the upper area of the case 131.
- a beading process and a crimping process may be provided after the above step.
- the beading process is a process in which an area of the case 131 corresponding to the negative current collector 120 , eg, an area of the case 131 corresponding to the extension 122 is depressed into the inside.
- the crimping process is a process of bending the top area of the case 131 inward while wrapping the top surface of the insulating gasket 162 . Through this process, the inner region of the case assembly 130 may be completely isolated from the outer region.
- 3A, 3B, and 3C illustrate examples of beading/crimping, seaming, and curling for improving sealing power in an exemplary secondary battery 100 according to the present disclosure. It is a drawing
- an area of the case 131 corresponding to the negative electrode current collector 120 may be recessed inward to provide a beading portion 1313, and an insulating gasket ( An area of the case 131 corresponding to the upper surface of 162) may be bent inward to provide a crimping portion 1314.
- the case 131, the negative current collector plate 120, and the safety vent 160 are stacked and bent in a clockwise direction, for example, so that the seaming portion 2313 is formed.
- the insulating gasket 135 may be omitted by providing the seaming portion 2313 .
- ends of the case 131 and the negative current collector 120 may be coupled while facing each other, and the safety vent 160 may cover the negative current collector 120 .
- the extension 122 of the negative current collector 120 and the corresponding region of the case 131 may be provided with a curling portion 3313 that is deep inwardly. .
- a portion of the negative current collector 120 may be depressed toward the insulation gaskets 162 and 135 by the curling portion 3313 .
- the beading part 1313, the crimping part 1314, the seaming part 2313, and/or the curling part 3313 may be provided alone or mixed, and by this structure, the secondary battery 100 ) can be further improved.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (11)
- 제1탭과 상기 제1탭의 반대측에 구비된 제2탭을 갖는 전극 조립체;상기 전극 조립체의 제1탭 상에 용접되되, 상기 전극 조립체의 직경보다 큰 직경을 갖는 제1집전판; 및상기 전극 조립체 및 제1집전판을 수용하는 케이스와, 상기 전극 조립체의 제2탭 상에 밀착되는 제2집전판과, 상기 제2집전판에 전기적으로 접속되고 상기 케이스를 관통하는 단자부를 포함하는 케이스 조립체를 포함하는, 이차 전지.
- 제 1 항에 있어서,상기 제1집전판 상에 배치된 지지부재를 더 포함하는, 이차 전지.
- 제 2 항에 있어서,상기 지지부재 상에 배치되고, 상기 케이스를 막는 안전 벤트를 더 포함하는, 이차 전지.
- 제 3 항에 있어서,상기 제1집전판은 원판과, 상기 원판에 제공되어 상기 제1탭에 용접되는 다수의 슬릿과, 상기 원판으로부터 외측 방향으로 연장되어 상기 케이스에 밀착되는 다수의 연장부를 포함하는, 이차 전지.
- 제 4 항에 있어서,상기 연장부는 상기 원판으로부터 절곡되되, 상기 케이스에 용접된, 이차 전지.
- 제 4 항에 있어서,상기 지지부재는 상기 연장부 상에 배치된, 이차 전지.
- 제 4 항에 있어서,상기 연장부, 상기 지지부재, 상기 케이스와 상기 안전 벤트의 사이에 개재된 제1가스켓을 더 포함하는, 이차 전지.
- 제 1 항에 있어서,상기 제2탭과 상기 제2집전판 사이에 개재된 스프링을 더 포함하는, 이차 전지.
- 제 7 항에 있어서,상기 케이스는 제1집전판과 대응되는 영역에 내측 방향으로 절곡된 비딩부와, 상기 제1가스켓을 감싸며 내측 방향으로 절곡된 크림핑부를 더 포함하는, 이차 전지.
- 제 1 항에 있어서,상기 케이스는 상기 제1집전판과 함께 외측 방향으로 절곡된 시밍부를 더 포함하는, 이차 전지.
- 제 1 항에 있어서,상기 케이스는 상기 제1집전판을 향해 절곡된 컬링부를 더 포함하는, 이차 전지.
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EP22807804.4A EP4340117A1 (en) | 2021-05-14 | 2022-05-10 | Secondary battery |
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KR20160120502A (ko) * | 2015-04-08 | 2016-10-18 | 주식회사 엘지화학 | 전극조립체 수납 공간을 최대화하여 용량 증대를 구현한 이차전지 및 이를 제조하는 방법 |
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US20230253568A1 (en) | 2023-08-10 |
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