WO2023140620A1 - 이차전지 - Google Patents
이차전지 Download PDFInfo
- Publication number
- WO2023140620A1 WO2023140620A1 PCT/KR2023/000886 KR2023000886W WO2023140620A1 WO 2023140620 A1 WO2023140620 A1 WO 2023140620A1 KR 2023000886 W KR2023000886 W KR 2023000886W WO 2023140620 A1 WO2023140620 A1 WO 2023140620A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gasket
- cap assembly
- secondary battery
- battery
- circumferential surface
- 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
- 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
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
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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
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
- H01M50/367—Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems
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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
- H01M50/394—Gas-pervious parts or elements
-
- 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
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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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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- 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 invention relates to a secondary battery, and more particularly, to a secondary battery having a porous member capable of venting gas.
- the secondary battery is classified into a cylindrical battery and a prismatic battery in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and a pouch-type battery in which the electrode assembly is embedded in a pouch-type case of an aluminum laminate sheet.
- the cylindrical battery has the advantage of having a relatively large capacity and structural stability.
- the electrode assembly embedded in the battery case is a power generating device capable of charging and discharging with a laminated structure of anode/separator/cathode, and is a jelly-roll type in which a separator is interposed between a long sheet-shaped cathode and anode coated with an active material, and a stack type in which a plurality of cathodes and anodes of a predetermined size are sequentially stacked with a separator interposed therebetween.
- the jelly-roll type electrode assembly has advantages of being easy to manufacture and having a high energy density per weight.
- a cylindrical secondary battery is manufactured by accommodating a jelly-roll type electrode assembly in a cylindrical case, injecting an electrolyte solution into the cylindrical case, and then combining a cap having an electrode terminal at an open top of the case.
- pouch-type secondary batteries, prismatic secondary batteries, etc. remove gas in advance by adding an activation gas discharge process during the gas production step.
- an activation gas discharge process cannot be used in a cylindrical secondary battery due to structural characteristics of maintaining an airtight seal after injection of an electrolyte.
- Cylindrical secondary batteries in which activation gas is not separately discharged in the manufacturing stage through an activation gas discharge process may easily increase internal pressure during actual use, which may cause a serious accident such as battery explosion.
- an object of the present invention is to provide a secondary battery capable of easily removing an activation gas generated inside a battery can in which an electrode assembly is accommodated in the process of activating or using the secondary battery.
- the electrode assembly a cap assembly including an upper cap plate forming a positive terminal and disposed above the battery can; and a gasket surrounding an edge of the cap assembly and interposed between the battery can and the cap assembly. and a porous member disposed between the cap assembly and the gasket to discharge gas generated in the battery can to the outside.
- the cap assembly may further include a safety vent coupled to a lower portion of the upper cap plate and protruding downward, and the safety vent may protrude upward and burst when pressure inside the battery can rises above a set pressure.
- the cap assembly may further include a current blocking element having at least a portion of an upper portion electrically connected to the upper cap plate and a lower portion electrically connected to the electrode assembly, and the current blocking device may block electrical connection with at least one of the upper cap plate and the electrode assembly when the pressure inside the battery can rises above a set pressure.
- the porous member may be coupled to at least one of an inner circumferential surface of the gasket facing the cap assembly and an outer circumferential surface of the cap assembly facing the gasket.
- porous member may be additionally interposed on the outer circumferential surface of the gasket facing the battery can.
- the porous member may be a porous film surrounding the rim of the gasket or cap assembly.
- the porous member may be a porous coating layer coated on the rim of the gasket or cap assembly.
- the porous member may be a porous ring extending along the circumference of the gasket and cap assembly.
- each of the porous film, the porous coating layer, and the porous ring may have a thickness of 0.1 mm to 1.0 mm.
- the porous member may have a pore size of 0.05 ⁇ m to 5.0 ⁇ m, and an air permeability at 1 kPa of 0.05 cm 3 /cm 2 *s to 10 cm 3 /cm 2 *s.
- the gasket includes a side support portion facing the side of the cap assembly and a horizontal bent portion extending from upper and lower ends of the side support portion and bent toward the cap assembly to contact upper and lower surfaces of the cap assembly, and at least one porous ring may be disposed between the horizontal bend portion of the gasket and the upper surface of the cap assembly, and between the horizontal bend portion and the lower surface of the cap assembly, respectively.
- a gas discharge passage communicating with the porous ring may be formed between an inner circumferential surface of the gasket and an outer circumferential surface of the upper cap assembly facing the outer circumferential surface of the upper cap assembly.
- a venting groove may be formed extending entirely or partially along an inner circumferential surface of the gasket, and the gas discharge passage may be formed between the venting groove and the outer circumferential surface of the upper cap assembly.
- venting groove extending over the portion may be formed at a predetermined interval along the inner circumferential surface of the gasket.
- concave portions may be formed along an outer circumferential surface of the cap assembly at a predetermined interval, and the gas discharge passage may be formed between the concave portion and the inner circumferential surface of the gasket.
- the present invention it is possible to prevent a phenomenon in which the pressure inside the secondary battery increases due to the gas generated in the secondary battery and the outer shape of the battery can is deformed.
- an accident such as explosion of a secondary battery due to an increase in internal pressure of the secondary battery can be effectively prevented.
- FIG. 1 is an exploded perspective view and partial cross-sectional view of a secondary battery of the present invention.
- FIG. 2 shows a battery can included in the secondary battery of the present invention and a modified example thereof.
- FIG 3 is a perspective view and a partial cross-sectional view of a cap assembly included in a secondary battery according to the first embodiment of the present invention and a gasket coupled thereto.
- FIG. 4 is a perspective view and a partial cross-sectional view of a cap assembly included in a secondary battery according to a second embodiment of the present invention and a gasket coupled thereto.
- FIG. 5 is a perspective view and a partial cross-sectional view of a cap assembly included in a secondary battery according to a third embodiment of the present invention and a gasket coupled thereto.
- FIG. 6 is a perspective view and a partial cross-sectional view of a porous ring included in a secondary battery according to a fourth embodiment of the present invention.
- FIG. 7 is a perspective view and a partial cross-sectional view of a cap assembly included in a secondary battery according to a fourth embodiment of the present invention and a gasket coupled thereto.
- FIG. 8 is a perspective view and a cross-sectional view of a gasket included in a secondary battery according to a fifth embodiment of the present invention.
- FIG. 9 is a cross-sectional view and a partially enlarged view of a secondary battery according to a fifth embodiment of the present invention.
- FIG. 10 is a perspective view and a cross-sectional view of a gasket included in a secondary battery according to a sixth embodiment of the present invention.
- FIG. 11 is a cross-sectional view and a partially enlarged view of a secondary battery according to a sixth embodiment of the present invention.
- FIG. 12 is an exploded perspective view of a cap assembly of a secondary battery according to a seventh embodiment of the present invention.
- FIG. 13 is a cross-sectional view and a partially enlarged view of a secondary battery according to a seventh embodiment of the present invention.
- FIG. 1 is an exploded perspective view and partial cross-sectional view of a secondary battery of the present invention.
- a secondary battery includes an electrode assembly 200, a battery can 300, a cap assembly 100, and a gasket 120.
- the electrode assembly 200 is accommodated in the battery can 300 with a positive electrode plate and a negative electrode plate disposed with a separator interposed therebetween.
- the electrode assembly 200 is also called a jelly-roll because it is wound and arranged in a jelly roll shape.
- the electrode plates of the electrode assembly 200 are formed as a structure in which an active material slurry is applied to a current collector, and the slurry may be typically formed by stirring an active material, a conductive material, a binder, a plasticizer, etc. in a solvent. In the direction in which the electrode plates are wound, it is preferable that a non-coated portion on which slurry is not applied is present at the beginning and end of the current collector.
- the positive lead is attached to the upper end of the electrode assembly 200 and electrically connected to the upper cap plate 110
- the negative lead is attached to the lower end of the electrode assembly 200 and electrically connected to the bottom of the battery can 300.
- an insulating plate 400 may be disposed on top of the electrode assembly 200 , and the insulating plate 400 serves to insulate between the electrode assembly 200 and the upper cap plate 110 .
- the battery can 300 is made of a lightweight conductive metal material such as aluminum, stainless steel, or an alloy thereof, and may have a cylindrical structure having an open top portion and a sealed bottom portion opposite thereto.
- the electrolyte solution is accommodated together with the electrode assembly 200 in the inner space of the battery can 300 .
- a beading portion 310 for mounting the cap assembly 100 may be formed on an upper portion of the battery can 300 .
- the beading part 310 is recessed inward between the cap assembly 100 and the electrode assembly 200, and more specifically, the lower end of the cap assembly 100 is seated and fixed on the upper part of the recessed inner surface of the beading part 310, and the upper end of the electrode assembly 200 may be located under the recessed inner surface of the beading part 310.
- FIG. 2 shows a battery can 300 included in the secondary battery of the present invention and a modified example thereof.
- a beading portion 310 recessed inwardly on the top of the battery can 300 extends along the circumference of the battery can 300.
- the battery can 300 of the present invention is not limited thereto, and the beading portion 310 may not be formed in the battery can 300 of the present invention, as shown in FIG. 2(b).
- a protrusion (not shown) may be formed on the inner surface of the battery can 300 protruding with a certain length so that the cap assembly 100 can be seated thereon.
- the battery can 300 on which the beading portion 310 is formed will be described as a base.
- the upper end of the battery can 300 is bent toward the cap assembly 100 to form a crimping portion 320.
- the crimping part 320 serves to press and fix the upper surface of the cap assembly 100 to prevent the upper cap assembly 100 from escaping to the outside and at the same time serves to completely seal the secondary battery from the outside.
- the crimping part 320 is formed by pressing the uppermost end of the battery can 300 to cover the upper surface of the gasket 120 surrounding the rim of the upper cap plate 110 .
- the cap assembly 100 of the present invention is inserted into the battery can 300 and placed on top of the battery can 300 .
- the cap assembly 100 includes an upper cap plate 110 disposed thereon to form a positive terminal. More specifically, the upper cap plate 110 is disposed in a form protruding upward from the top of the cap assembly 100 and forms a positive terminal. Accordingly, the upper cap plate 110 electrically connects the secondary battery to the outside.
- the upper cap plate 110 may be formed of a metal material such as stainless steel or aluminum in consideration of strength and conductivity.
- the upper cap plate 110 has a protruding central portion, and a side surface of the protruding portion has an inclined surface along an edge of the protruding portion.
- An edge portion of the upper cap plate 110 may be designed to be level with the bottom of the battery can 300, but is not limited thereto.
- the diameter of the upper cap plate 110 is preferably equal to or slightly smaller than the inner diameter of the battery can 300 so that it can be inserted into the battery can 300 .
- a gas hole 111 through which gas can be discharged may be formed in the upper cap plate 110 .
- the gas hole 111 may be formed, for example, on a side surface of a protruding portion of the upper cap plate 110, that is, on an inclined surface.
- a safety vent 140 blocking an inner space communicating with the gas hole 111 from the electrode assembly 200 may be further provided inside the cap assembly 100 .
- the safety vent 140 is coupled to the lower portion of the upper cap plate 110 and has a shape protruding downward.
- the safety vent 140 protrudes upward and ruptures, thereby discharging gas to the outside.
- Gas generated inside the secondary battery cannot be discharged through the gas hole 111 due to the safety vent 140 in a normal state.
- the safety vent 140 ruptures to discharge the gas filled therein to the outside, and the explosion of the secondary battery can be prevented.
- the safety vent 140 is configured to burst when the gas pressure inside the secondary battery increases to a certain level.
- the cap assembly 100 of the present invention may further include a current blocking element 150 .
- the current blocking element 150 is a component of the cap assembly 100 in which at least a portion of an upper portion is connected to a lower portion of the safety vent 140 . More specifically, the current blocking element 150 is disposed between the safety vent 140 and the electrode assembly 200 .
- the current blocking element 150 may block electrical connection with at least one of the upper cap plate 110 and the electrode assembly 200 when the pressure inside the battery can 300 rises above a set pressure. Specifically, in a normal state, the lower protruding part of the safety vent 140 comes into contact with the current blocking element 150, but when internal pressure (gas pressure) increases due to gas generation and the shape of the safety vent 140 is reversed, electrical connection between the current blocking element 150 and the safety vent 140 may be cut off. Also, a lower portion of the current blocking element 150 may be connected to the electrode assembly 200 through an electrode lead 210 . Therefore, in a normal state, the current blocking element 150 allows conduction between the electrode assembly 200 and the safety vent 140 . The current blocking element 150 may be deformed or damaged along with the safety vent 140 due to an increase in internal pressure of the secondary battery, and as a result, electrical connection with the electrode assembly 200 may be cut off.
- the cap assembly 100 of the present invention may further include a safety element (not shown) provided under the upper cap plate 110 .
- the safety element is interposed between the upper cap plate 110 and the safety vent 140, and electrically connects the upper cap plate 110 and the safety vent 140.
- the safety element is to block the flow of current inside the battery due to overheating of the battery, and may be formed of, for example, a PTC element (Positive Temperature Coefficient Element).
- the gasket 120 surrounds the edge of the cap assembly 100 and is interposed between the battery can 300 and the cap assembly 100.
- the gasket 120 may be made of a material having electrical insulation, impact resistance, elasticity, and durability, such as polyolefin or polypropylene.
- the gasket 120 insulates the cap assembly 100 from being electrically connected to the battery can 300 .
- the gasket 120 prevents the electrolyte stored in the battery can 300 from leaking through a minute gap between the cap assembly 100 and the battery can 300 .
- the gasket 120 may be largely divided into a side support portion 120a and a horizontal bent portion 120b.
- the gasket 120 includes a side support portion 120a facing the side of the cap assembly 100 and a horizontal bent portion 120b extending from upper and lower ends of the side support portion 120a and bent toward the cap assembly 100 to contact the upper and lower surfaces of the cap assembly 100.
- the side support portion 120a of the gasket 120 supports and surrounds the side surface of the cap assembly 100, and the horizontal bent portions 120b extending from the upper and lower ends of the side support portion 120a press the upper and lower surfaces of the rim of the cap assembly 100, respectively, to completely adhere to the cap assembly 100.
- the porous member 130 is disposed between the gasket 120 and the upper cap plate 110 to discharge gas generated in the battery can 300 to the outside.
- the porous member 130 includes a porous material to selectively discharge the gas generated inside the secondary battery to the outside.
- the material of the porous member 130 includes pores, and is made of a material capable of selectively passing only gas while obstructing the flow of liquid through the pores.
- the porous member 130 may be made of a porous polytetrafluoroethylene (PTFE) material.
- PTFE polytetrafluoroethylene
- the size of the pores of the porous member 130 is designed to be sufficiently small so as to pass only gas such as gas and not pass the electrolyte inside the secondary battery to the outside.
- the size of the pores is 0.05 to 5.0 ⁇ m
- the air permeability at 1 kPa is 0.05 to 10 cm 3 / cm 2 *s.
- the porous member 130 may be independently manufactured in a film shape or a circular ring shape. Alternatively, it may be manufactured by being coated on the surface of another member. More specifically, the porous member 130 of the present invention may be in the form of at least one of a porous film, a porous coating layer, and a porous ring 130a. At this time, the thickness of the porous film, the porous coating layer and the porous ring 130a is preferably 0.1 mm to 1.0 mm, more preferably 0.3 mm to 0.8 mm, respectively.
- the thickness of the porous member 130 having various shapes is less than 0.1 mm, a large amount of gas cannot be smoothly moved, and when it exceeds 1.0 mm, the sealing force of the liquid electrolyte inside the secondary battery may decrease, and structural stability of the secondary battery may also decrease.
- the secondary battery of the present invention may have various embodiments depending on the shape, structure, and attachment position of the porous member 130, the gasket 120, and the cap assembly 100.
- FIG. 3 relates to secondary battery-related configurations according to the first embodiment
- FIG. 4 relates to secondary battery-related configurations according to the second embodiment
- FIG. 5 relates to secondary battery-related configurations according to the third embodiment
- FIGS. 6 and 7 relate to secondary battery-related configurations according to the fourth embodiment
- FIGS. 8 and 9 relate to secondary battery-related configurations according to the fifth embodiment
- FIGS. 12 and 13 relate to secondary battery-related configurations according to the seventh embodiment.
- the porous member 130 included in the secondary battery according to the first embodiment is attached to the surface of the cap assembly 100 and the gasket 120 so as to be interposed between the cap assembly 100 and the gasket 120. It may be a porous film in the form of a film.
- the porous member 130 is interposed between the gasket 120 and the cap assembly 100 . More specifically, the porous member 130 may be coupled to at least one of an inner circumferential surface of the gasket 120 facing the cap assembly 100 and an outer circumferential surface of the cap assembly 100 facing the gasket 120.
- the porous member 130 may be attached to and coupled to the inner circumferential surface of the gasket 120 to extend along the circumferential direction of the gasket 120 .
- the gasket 120 is combined with the rim of the cap assembly 100 in a state where the porous member 130 is attached to the inner circumferential surface.
- FIG 3 is a perspective view and a partial cross-sectional view of a cap assembly 100 included in a secondary battery according to the first embodiment of the present invention and a gasket 120 coupled thereto.
- the porous member 130 is interposed between the cap assembly 100 and the gasket 120 . At this time, the cap assembly 100 and the gasket 120 are spaced apart from each other by a predetermined distance by the porous member 130 .
- the porous member 130 is disposed in contact with the entire inner circumferential surface of the side support portion 120a and the horizontal bent portion 120b of the gasket 120 .
- the porous member 130 may protrude a predetermined length from the end of the horizontally bent portion 120b of the gasket 120 as shown.
- the porous member 130 serves as a path for gas to move between the cap assembly 100 and the gasket 120 . That is, the gas generated from time to time in the battery can 300 moves through the porous member 130 interposed between the cap assembly 100 and the gasket 120 and passes through the upper cap plate 110 of the cap assembly 100 and the gasket 120 and is discharged to the outside.
- the porous member 130 included in the secondary battery according to the second embodiment is additionally formed on the outer circumferential surface of the gasket 120 .
- the porous member 130 is interposed between the cap assembly 100 and the gasket 120 and between the battery can 300 and the gasket 120, as in the first embodiment.
- the surface of the cap assembly 100 and the gasket 120 may be attached to the surface of the porous film.
- the porous member 130 is formed on the outer circumferential surface of the gasket 120 facing the battery can 300 and extends along the circumferential direction of the gasket 120 .
- FIG. 4 is a perspective view and a partial cross-sectional view of a cap assembly 100 included in a secondary battery according to a second embodiment of the present invention and a gasket 120 coupled thereto.
- the porous member 130 is attached to the inner and outer circumferential surfaces of the gasket 120, respectively.
- gas emission efficiency can be further increased. That is, the gas generated from time to time in the battery can 300 moves through the porous member 130 interposed between the cap assembly 100 and the gasket 120 and the porous member 130 interposed between the battery can 300 and the gasket 120, and escapes between the cap assembly 100 and the gasket 120 and between the battery can 300 and the gasket 120, respectively, and is discharged to the outside. It becomes.
- the porous member 130 included in the secondary battery according to the third embodiment is coated on the gasket 120 or the edge of the cap assembly 100 .
- the porous member 130 may be coated on the entire surface of the gasket 120 instead of being made of a film and attached to the cap assembly 100 and the gasket 120 in a separate process.
- FIG 5 is a perspective view and a partial cross-sectional view of a cap assembly 100 included in a secondary battery according to a third embodiment of the present invention and a gasket 120 coupled thereto.
- the porous member 130 covers the entire surface of the gasket 120 .
- manufacturing efficiency can be increased.
- gas generated inside the secondary battery can move through two paths as in the second embodiment, and since the porous member 130 is formed in a wider area than in the second embodiment, gas discharge efficiency can be improved.
- the porous member 130 of the present invention may be a ring-shaped porous ring 130a extending along the circumference of the gasket 120 and the cap assembly 100 .
- FIG. 6 is a perspective and partial cross-sectional view of a porous ring 130a of the present invention.
- the porous ring 130a may have a circular cross section, but may also have a polygonal shape such as a triangle and a quadrangle.
- the ring-shaped porous member 130 as described above does not need to be manufactured with the shape and structure of the cap assembly 100 or the gasket 120 in mind as in the first and second embodiments, and the process of coating the porous member 130 on the surface of the gasket 120 can also be omitted as in the third embodiment. Therefore, the manufacturing efficiency of the secondary battery can be improved.
- a plurality of porous rings 130a having various diameters can be installed on the cap assembly 100, it is advantageous in that it is easy to control the gas discharge performance.
- At least one porous ring 130a may be disposed between the horizontally bent portion 120b of the gasket 120 and the upper surface of the cap assembly 100 and between the horizontally bent portion 120b and the lower surface of the cap assembly 100, respectively.
- two or more porous rings 130a may be disposed on the upper and lower surfaces of the cap assembly 100, respectively.
- FIG. 7 is a perspective view and a partial cross-sectional view of a cap assembly 100 included in a secondary battery according to a fourth embodiment of the present invention and a gasket 120 coupled thereto.
- the porous ring 130a may be interposed between the cap assembly 100 and the gasket 120 at upper and lower portions of the cap assembly 100 .
- the porous ring 130a may be interposed between the side surface of the cap assembly 100 and the side support portion 120a of the gasket 120.
- a gas discharge passage communicating with the porous ring 130a is formed between the inner circumferential surface of the gasket 120 and the outer circumferential surface of the cap assembly 100 facing the outer circumferential surface of the cap assembly 100 .
- the gasket 120 and the cap assembly 100 are maintained at a predetermined interval as the porous ring 130a is interposed therebetween, and the above interval forms a gas discharge passage through which gas can move. Since the gas discharge passage selectively moves gas by the porous ring 130a, the electrolyte inside the secondary battery is not discharged to the outside through the gas discharge passage.
- the cap assembly 100 may be designed to be spaced apart from the gasket 120 by a predetermined distance.
- the diameter of the cap assembly 100 may be smaller than the inner circumferential diameter of the gasket 120 .
- the gasket 120 may have a venting groove (a) extending along the inner circumferential surface, or may have a venting groove (a) extending along a portion of the inner circumferential surface.
- FIG 8 is a perspective view and a cross-sectional view of a gasket 120 included in a secondary battery according to a fifth embodiment of the present invention.
- venting groove (a) is formed to extend along the circumferential direction of the gasket 120 from the inner circumferential surface of the gasket 120 .
- the venting groove (a) is formed to widen the gap between the side surface of the cap assembly 100 and the side support portion 120a of the gasket 120 so that the gas can move more smoothly.
- venting groove (a) is preferably formed on the side support portion (120a) of the gasket (120).
- FIG. 9 is a cross-sectional view and a partially enlarged view of a secondary battery according to a fifth embodiment of the present invention.
- the size of the venting groove (a) be larger than the thickness of the cap assembly 100 so that gas can flow.
- the gasket 120 may be spaced at a predetermined interval along the inner circumferential surface to form a venting groove (a).
- FIG 10 is a perspective view and a cross-sectional view of a gasket 120 included in a secondary battery according to a sixth embodiment of the present invention.
- the venting grooves (a) are formed along the inner circumferential surface of the gasket 120 at regular intervals.
- the space between the venting grooves (a) and the venting grooves (a) of the inner circumferential surface of the gasket 120 closely adheres to and supports the side surface of the cap assembly 100 inserted inwardly, and the space where the venting groove (a) is formed is spaced apart from the side surface of the cap assembly 100 by a predetermined distance to form a gas discharge passage.
- FIG. 11 is a cross-sectional view and a partially enlarged view of a secondary battery according to a sixth embodiment of the present invention.
- the secondary battery according to the sixth embodiment moves gas through the venting groove (a) similarly to the fifth embodiment. Since the space of the venting groove (a) of the gasket 120 included in the secondary battery according to the sixth embodiment is relatively smaller than the venting groove (a) included in the gasket 120 of the secondary battery according to the fifth embodiment, the gas discharge efficiency may be somewhat lowered, but the side fixing effect of the cap assembly 100 by the gasket 120 is more excellent.
- the size of the venting groove (a) be larger than the thickness of the cap assembly 100 so that the gas can move like the fifth embodiment.
- the cap assembly 100 may include concave portions b spaced apart from each other at regular intervals along the outer circumferential surface. This feature is the same even when a plurality of components are included in the cap assembly 100 .
- the concave portion b is formed in both the upper cap plate 110 and the safety vent 140.
- the concave portion b formed in the upper cap plate 110 and the concave portion b formed in the safety vent 140 coincide with each other.
- FIG. 12 is an exploded perspective view of a cap assembly 100 of a secondary battery according to a seventh embodiment of the present invention.
- concave portions (b) spaced apart at regular intervals are formed on the edges of the upper cap plate 110 and the safety vent 140 bonded to the lower portion of the upper cap plate 110, respectively.
- the safety vent 140 is coupled to the lower portion of the upper cap plate 110 by adjusting the position of the concave portion b of the upper cap plate 110 to match the position of the concave portion b of the upper cap plate 110 .
- FIG. 13 is a cross-sectional view and a partially enlarged view of a secondary battery according to a seventh embodiment of the present invention.
- the concave portion b of the side surface of the cap assembly 100 and the space between the concave portion b are in close contact with the side support portion 120a of the gasket 120, and the space in which the concave portion b is formed becomes a gas discharge passage through which gas moves.
- the concave portion (b) includes a gas discharge passage between the inner circumferential surfaces of the gasket 120, and similar to the sixth embodiment, gas is discharged to the outside through the gas discharge passage formed at a predetermined interval along the circumferential direction of the cap assembly 100 or the gasket 120.
- the venting groove 121 is formed on the inner circumferential surface of the gasket 120 to form a gas discharge passage, there is no need to limit the size or shape of the concave portion (b). It has the advantage of high manufacturing convenience of the secondary battery.
Landscapes
- 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)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
Claims (15)
- 전극 조립체;상기 전극 조립체가 수용되는 전지 캔;양극 단자를 형성하는 상부 캡 플레이트를 포함하고 상기 전지 캔의 상부에 배치되는 캡 조립체; 및상기 캡 조립체의 테두리를 감싸며 상기 전지 캔과 상기 캡 조립체 사이에 개재되는 가스켓; 을 포함하고,상기 캡 조립체와 가스켓 사이에 배치되어 상기 전지 캔 내에서 발생하는 가스를 외부로 배출하는 다공성 부재를 더 포함하는 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 캡 조립체는 상기 상부 캡 플레이트의 하부에 결합되고, 하방으로 돌출된 형상을 갖는 안전 벤트를 더 포함하고,상기 안전 벤트는 전지 캔 내부의 압력이 설정된 압력 이상으로 상승 시, 상방으로 변위되어 파열하는 이차전지.
- 제1항에 있어서,상기 캡 조립체는, 상부의 적어도 일부분이 상부 캡 플레이트와 전기적으로 연결되고, 하부가 전극 조립체와 전기적으로 연결되는 전류 차단 소자를 더 포함하고,상기 전류 차단 소자는 전지 캔 내부의 압력이 설정된 압력 이상으로 상승 시, 상기 상부 캡 플레이트 및 전극 조립체 중 적어도 어느 하나와의 전기적 연결을 차단하는 이차전지.
- 제1항에 있어서,상기 다공성 부재는, 상기 캡 조립체와 대면하는 가스켓의 내주면 및 상기 가스켓과 대면하는 상기 캡 조립체의 외주면 중 적어도 어느 하나에 결합되는 이차전지.
- 제4항에 있어서,상기 전지 캔과 대면하는 가스켓의 외주면 상에 상기 다공성 부재가 추가적으로 개재되는 이차전지.
- 제1항에 있어서,상기 다공성 부재는 상기 가스켓 또는 캡 조립체의 테두리를 감싸는 다공성 필름인 이차전지.
- 제1항에 있어서,상기 다공성 부재는 상기 가스켓 또는 캡 조립체의 테두리에 코팅되는 다공성 코팅층인 이차전지.
- 제1항에 있어서,상기 다공성 부재는 상기 가스켓 및 캡 조립체의 둘레를 따라 연장 형성되는 다공성 링인 이차전지.
- 제6항 내지 제8항에 있어서,상기 다공성 필름, 다공성 코팅층 및 다공성 링의 두께는 각각 0.1 ㎜ 내지 1.0 ㎜ 인 이차전지.
- 제1항에 있어서,상기 다공성 부재는 기공의 크기가 0.05 ㎛ 내지 5.0 ㎛ 이고, 1kPa에서의 통기도가 0.05 ㎤/㎠*s 내지 10 ㎤/㎠*s 인 이차전지.
- 제8항에 있어서,상기 가스켓은 상기 캡 조립체의 측부에 대향하는 측면 지지부 및 상기 측면 지지부의 상하측 단부로부터 연장되어 상기 캡 조립체를 향해 절곡되어 캡 조립체의 상부면 및 하부면과 접촉하는 수평 절곡부를 포함하고,상기 다공성 링은 상기 가스켓의 수평 절곡부 및 캡 조립체의 상부면 사이와 수평 절곡부 및 캡 조립체의 하부면 사이에 각각 적어도 하나 이상 배치되는 이차전지.
- 제8항에 있어서,상기 가스켓의 내주면과 이에 대향하는 상기 상부 캡 조립체의 외주면 사이에 상기 다공성 링과 연통되는 가스배출통로가 형성되는 이차전지.
- 제12항에 있어서,상기 가스켓의 내주면을 따라 전체적으로 또는 일부에 걸쳐 상기 가스켓 내주면 상에 벤팅 홈이 연장 형성되고,상기 벤팅 홈과 상기 상부 캡 조립체의 외주면 사이에 상기 가스배출통로가 형성되는 이차전지.
- 제13항에 있어서,상기 일부에 걸쳐 연장 형성되는 벤팅 홈은 상기 가스켓의 내주면을 따라 일정 간격 이격되어 형성되는 이차전지.
- 제12항에 있어서,상기 캡 조립체의 외주면을 따라 일정 간격 이격되어 오목부가 형성되고,상기 오목부와 상기 가스켓 내주면 사이에 상기 가스배출통로가 형성되는 이차전지.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023548812A JP7632800B2 (ja) | 2022-01-19 | 2023-01-18 | 二次電池 |
| US18/278,348 US20240154245A1 (en) | 2022-01-19 | 2023-01-18 | Secondary battery |
| CN202380010243.0A CN116964845A (zh) | 2022-01-19 | 2023-01-18 | 二次电池 |
| ES23743466T ES3052644T3 (en) | 2022-01-19 | 2023-01-18 | Secondary battery |
| EP23743466.7A EP4276998B1 (en) | 2022-01-19 | 2023-01-18 | Secondary battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020220007919A KR102798777B1 (ko) | 2022-01-19 | 2022-01-19 | 이차전지 |
| KR10-2022-0007919 | 2022-01-19 |
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| Publication Number | Publication Date |
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| WO2023140620A1 true WO2023140620A1 (ko) | 2023-07-27 |
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| PCT/KR2023/000886 Ceased WO2023140620A1 (ko) | 2022-01-19 | 2023-01-18 | 이차전지 |
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| Country | Link |
|---|---|
| US (1) | US20240154245A1 (ko) |
| EP (1) | EP4276998B1 (ko) |
| JP (1) | JP7632800B2 (ko) |
| KR (1) | KR102798777B1 (ko) |
| CN (1) | CN116964845A (ko) |
| ES (1) | ES3052644T3 (ko) |
| HU (1) | HUE073402T2 (ko) |
| WO (1) | WO2023140620A1 (ko) |
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| KR20260037827A (ko) * | 2024-09-11 | 2026-03-18 | 주식회사 엘지에너지솔루션 | 실링 가스켓, 배터리 셀, 배터리 팩, 및 이를 포함하는 자동차 |
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Also Published As
| Publication number | Publication date |
|---|---|
| HUE073402T2 (hu) | 2026-01-28 |
| EP4276998A4 (en) | 2025-03-12 |
| ES3052644T3 (en) | 2026-01-12 |
| KR102798777B1 (ko) | 2025-04-22 |
| JP2024508112A (ja) | 2024-02-22 |
| CN116964845A (zh) | 2023-10-27 |
| EP4276998A1 (en) | 2023-11-15 |
| EP4276998B1 (en) | 2025-08-06 |
| US20240154245A1 (en) | 2024-05-09 |
| KR20230111898A (ko) | 2023-07-26 |
| JP7632800B2 (ja) | 2025-02-19 |
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