WO2011115392A2 - 이차 전지 - Google Patents

이차 전지 Download PDF

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Publication number
WO2011115392A2
WO2011115392A2 PCT/KR2011/001739 KR2011001739W WO2011115392A2 WO 2011115392 A2 WO2011115392 A2 WO 2011115392A2 KR 2011001739 W KR2011001739 W KR 2011001739W WO 2011115392 A2 WO2011115392 A2 WO 2011115392A2
Authority
WO
WIPO (PCT)
Prior art keywords
gasket
leakage preventing
cap assembly
case
secondary battery
Prior art date
Application number
PCT/KR2011/001739
Other languages
English (en)
French (fr)
Korean (ko)
Other versions
WO2011115392A3 (ko
Inventor
오경수
구자훈
최용수
김성종
이정아
장재동
김동명
정준용
황성민
김도균
남상봉
Original Assignee
주식회사 엘지화학
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from KR1020100023887A external-priority patent/KR20110029061A/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US13/132,767 priority Critical patent/US8663837B2/en
Publication of WO2011115392A2 publication Critical patent/WO2011115392A2/ko
Publication of WO2011115392A3 publication Critical patent/WO2011115392A3/ko

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Classifications

    • 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
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • 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
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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 lithium ion / polymer secondary battery.
  • the secondary battery unlike the primary battery, means a battery that can be charged and discharged, and is widely used for power sources such as mobile phones, notebook computers, camcorders, electronic devices, electric vehicles, and the like.
  • the lithium secondary battery has an operating voltage of 3.6 V, and has a capacity of about three times or more than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment. Is rapidly increasing.
  • Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively.
  • the lithium secondary battery may be classified into a square battery, a cylindrical battery, and a pouch type battery.
  • the lithium ion secondary battery includes an electrode assembly in which a positive electrode / separator / negative electrode is sequentially arranged, and a packaging material for sealingly storing the electrode assembly together with the electrolyte solution.
  • the packaging material of the rectangular or cylindrical secondary battery includes a case in which an open end is formed, and a cap assembly sealingly coupled to the open end of the case.
  • the electrode assembly is classified into a jelly-roll type wound by a separator between a sheet-shaped anode and a cathode coated with an active material, and a stack type sequentially laminated with a separator between a cathode and a cathode of a predetermined size.
  • the jelly-roll type electrode assembly is easy to manufacture and has a high energy density per weight, and in particular, the jelly-roll type electrode assembly is widely used because it is easy to store in a case of a cylindrical or rectangular battery.
  • a null is used for a pouch type battery as a stack type electrode assembly.
  • the electrode assembly tends to deform while undergoing repeated expansion and contraction.
  • stress is concentrated on the metallic center pin so that the electrodes are concentrated.
  • internal short circuits There is a tendency for internal short circuits to occur by drilling through the separator and contacting the metal center pin.
  • the internal short circuit of the secondary battery is connected to the heat generated by the battery, so that the organic solvent is decomposed to generate gas, and the external material may be ruptured by increasing the pressure inside the battery.
  • the increase in the gas pressure inside the battery may also be caused by an internal short circuit caused by an external impact.
  • a secondary battery basically includes a PTC element.
  • the cylindrical secondary battery forms safety devices such as a safety vent for discharging high pressure gas and a current interrupt device (CID) that blocks current when the internal pressure of the battery increases, and protruding terminals for protecting the devices.
  • a cap assembly including a top-cap, the cap assembly being hermetically coupled to the case by a gasket.
  • Korean Patent Laid-Open No. 10-2006-0037595 discloses a secondary battery in which at least one row of wrinkles of irregularities is formed on a surface of a gasket contacting a case and a cap assembly.
  • the secondary battery according to the related art also only forms the uneven structure only in the gasket made of plastic, and thus still does not solve the problem of deterioration of the sealability of the secondary battery. Because of the sealing structure of the gasket of the secondary battery of the prior art, the sealing property of the primary leakage of the electrolyte and / or gas, that is, the interface portion between the safety vent located in the bottom layer of the cap assembly and the gasket surrounding its outer peripheral surface. It was not focused.
  • the sealing method disclosed in the prior art seals at the final end of such an interface in the state where the electrolyte or the like leaks through the interface of the safety vent and the gasket surrounding its outer circumferential surface.
  • the sealing structure between the cap assembly and the gasket according to the prior art clearly had its limitations.
  • the present invention has been conceived to overcome the above problems, the structure so that the electrolyte and / or gas is leaked or leaked for the first time, that is to seal more completely between the interface of the cap assembly including the gasket and the safety vent
  • the purpose is to provide an improved secondary battery.
  • the electrode assembly is a positive electrode plate and a negative electrode plate disposed between the separator;
  • a case accommodating the electrode assembly;
  • a cap assembly capable of sealing the open end of the case;
  • a gasket interposed between the case and the cap assembly;
  • a leakage preventing part formed on at least one of one surface of the cap assembly or one surface of the gasket which is in contact with the gasket while facing the electrode assembly.
  • the cap assembly comprises: a top cap sealing an open end of the case;
  • the PTC device and one surface disposed to contact the top cap are in contact with the PTC device, and the other surface has a safety vent formed to contact the gasket and having the leakage preventing part formed thereon, and electrically connected to the electrode assembly.
  • the leakage preventing part includes at least one or more irregularities or at least one or more protrusions formed on the contact surface of the cap assembly.
  • the irregularities are triangular or square or round or round structure.
  • the protrusion is a triangular pyramid or a conical structure.
  • the uneven or the projection further comprises a barb.
  • the safety vent is a metal material.
  • the apparatus further includes a second leakage preventing part formed on a contact surface of the cap assembly facing the leakage preventing part and in contact with the gasket.
  • the apparatus further includes a third leakage preventing part formed on a contact surface of the can contacting the gasket.
  • At least one of the second leakage preventing part and the third leakage preventing part includes at least one or more irregularities or at least one or more protrusions.
  • At least one of the leakage preventing part and the third leakage preventing part includes at least one or more irregularities or at least one or more protrusions.
  • the cap assembly in which the electrolyte or the gas is leaked to the minimum that is, the cap assembly in which the top cap, the PTC element, and the safety vent are sequentially arranged, and one side of the gasket contacting the secondary battery
  • FIG. 1 is a cross-sectional view schematically showing the configuration of a secondary battery according to an exemplary embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • FIG 3 is a cross-sectional view illustrating a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • FIG. 4 is a cross-sectional view illustrating a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • FIG. 5 is a cross-sectional view illustrating a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional view of a modification of the cap assembly of the embodiment of FIG. 5.
  • FIG. 7 is a schematic cross-sectional view of a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • a secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate are disposed between separators, a case in which the electrode assembly is housed, a cap assembly capable of sealing an open end of the case; And a gasket interposed between the case and the cap assembly, and a leakage preventing portion formed on at least one of one side of the cap assembly or one side of the gasket that is in contact with the gasket while facing the electrode assembly.
  • the cap assembly includes a top cap that seals the open end of the case, a PTC element disposed to contact the top cap, and one side of the cap element contacting the PTC element, and the other side of the cap assembly to be formed to contact the gasket, and the electrode assembly And a safety vent electrically connected to the.
  • the interface portion between the cap assembly and the gasket in particular the interface portion between the gasket and the safety vent, has a high possibility of leakage of electrolyte or gas or the like, as described above, the leakage preventing portion is formed, so that the safety vent is shorted until the safety vent is shorted. It is possible to greatly prevent the leakage of the electrolyte or gas at the interface, thereby greatly improving the safety of the battery.
  • the leakproof portion includes at least one or more irregularities or at least one or more protrusions formed on the contact surface of the cap assembly and the gasket.
  • the leakage preventing portion of the projection or the uneven structure improves the bonding force between the cap assembly and the gasket when the cap assembly is assembled with the case of the battery via the gasket by a mechanical pressing process (clamping process). This is because the protrusion or uneven leakage preventing part of the protrusion or uneven structure penetrates through a part of the surface of the plastic gasket, and the bonding force between the cap assembly and the gasket thus joined is very high.
  • the leakage preventing portion of the protrusion or the uneven structure may be formed on at least one of the surface of the cap assembly in contact with the gasket and the surface of the gasket in contact with the gasket.
  • corrugation is formed in the surface of all these in terms of bonding force.
  • the leakage preventing portion in the form of protrusions or irregularities may be a structure capable of solidifying the coupling force between the gasket and the cap assembly, and should not be particularly limited in its position, size, shape, and the like.
  • the leakage preventing portion of the uneven structure has a triangular or square or circular or round shape in cross section
  • the leakage preventing portion of the protrusion structure is a triangular pyramid or cone structure having a sharp point.
  • Pointed triangular pyramids or cone-shaped protrusions are mainly formed in safety vents, which can easily penetrate into the surface of the gasket, thus improving the cohesion, cohesion (fixability), and form occlusion between the interfaces in contact. You can.
  • the leakage preventing portion of the protrusion structure is preferably formed with a barbed portion in the form of a conventional fishing hook at the end of the protrusion to further improve the bonding force and / or adhesion between the interface.
  • the secondary battery according to another preferred embodiment of the present invention further includes a second leakage preventing portion formed on a surface of the cap assembly facing the leakage preventing portion of the aforementioned embodiment and in contact with the gasket.
  • the second leakage preventing part prevents leakage of the electrolyte solution or gas primarily from the leakage prevention part, and serves to prevent leakage of the gas or electrolyte solution if it is still insufficient.
  • the structure, shape, etc. of a 2nd leakage prevention part are the same as that of the above-mentioned leakage prevention part.
  • the secondary battery according to still another preferred embodiment of the present invention further includes a third leakage preventing part formed on any one surface of a case contacting the gasket and a surface of the gasket contacting the gasket.
  • the third leakage preventing part is for preventing the leakage of the electrolyte or gas through the interface between the case and the gasket separately from the leakage preventing part and the second leakage preventing part.
  • the safety vent is preferably a metal material.
  • the size of the safety vent may vary depending on the material and structure, and the like, and the size of the safety vent is not particularly limited as long as the safety vent may burst while generating a high pressure inside the battery.
  • the thickness of the safety vent may be approximately 0.2 to 0.6 mm.
  • the thickness of the PTC device may also vary depending on the material and structure, and may be preferably 0.2 to 0.4 mm. However, if the thickness of the PTC element is too thick, the internal resistance increases, and the size of the battery may be increased to reduce the capacity of the battery compared to the same standard. On the contrary, if the thickness of the PTC element is too thin, it is not preferable because it is difficult to exert a desired current interruption effect at a high temperature and can be destroyed by a weak external impact. Therefore, the thickness of the PTC element can be appropriately determined within the above-described thickness range in consideration of these points in combination.
  • the thickness of the top-cap portion in contact with the PTC device is not particularly limited as long as it can protect various components of the cap assembly from an externally applied pressure, and may be preferably 0.3 to 0.5 mm. If the thickness of the top-cap portion is too thin, it is difficult to exert a predetermined mechanical rigidity. On the contrary, if the thickness of the top-cap portion is too thick, the capacity of the battery may be reduced by increasing the size and weight, which is not preferable.
  • the gasket is made of an electrically insulating elastic material, and the material is not particularly limited as long as the material has electrical insulating property, impact resistance, elasticity, and durability.
  • the material is not particularly limited as long as the material has electrical insulating property, impact resistance, elasticity, and durability.
  • polyolefine and polypropylene (PP) may be used.
  • Can be used.
  • the positive electrode lead welded to the positive electrode foil of the jelly-roll type electrode assembly is electrically connected to the cap assembly and connected to the protruding terminal at the top of the top cap, and the negative electrode lead welded to the negative electrode foil.
  • the material of the case is not particularly limited and may be formed of any one of stainless steel, steel, aluminum, or equivalents thereof.
  • the secondary battery according to the preferred embodiments of the present invention may be a lithium (ion) secondary battery having high energy density, high discharge voltage, and high output stability.
  • the lithium secondary battery may be composed of a positive electrode, a negative electrode, a separator, a nonaqueous electrolyte containing lithium salt, and the like.
  • the positive electrode is prepared by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector, followed by drying, and, if necessary, may further include a filler.
  • the negative electrode is manufactured by coating and drying a negative electrode active material on a negative electrode current collector, and the above-described components may be further included as necessary.
  • the separator is interposed between the cathode and the anode, and an insulating thin film having high ion permeability and mechanical strength is used.
  • the lithium salt-containing non-aqueous electrolyte is composed of a nonaqueous electrolyte and a lithium salt, and the nonaqueous electrolyte is a liquid nonaqueous electrolyte, a solid electrolyte, an inorganic solid electrolyte, or the like.
  • a current collector, an electrode active material, a conductive material, a binder, a filler, a separator, an electrolyte, a lithium salt, and the like are known in the art, and thus detailed description thereof is omitted.
  • FIG. 1 is a cross-sectional view schematically showing the configuration of a secondary battery according to a preferred embodiment of the present invention.
  • the secondary battery 100 includes a cylindrical case 20 accommodating the electrode assembly 10 together with an electrolyte, and a cap assembly sealingly coupled to an open end of the case 20. 30, a gasket 40 interposed between the case 20 and the cap assembly 30, and a face (bottom of the drawing) of the cap assembly 30 facing the electrode assembly 10 and a gasket in contact with the face ( The liquid leakage prevention part 50 formed in all the surfaces of 40 is provided.
  • the electrode assembly 10 is interposed between two electrode plates 11 having different polarities from each other and having a wide plate shape in a roll shape and the electrode plates 11 to insulate the electrode plates 11 from each other. It is preferable to have a separator 12 disposed on the left side or the right side of the electrode plate 11 and wound in a so-called 'Jelly Roll' shape.
  • the positive electrode plate and the negative electrode plate of a predetermined standard may be stacked in such a manner that the separator is interposed therebetween.
  • the two electrode plates 11 have a structure in which an active material slurry is applied to a current collector in the form of a metal foil or a metal mesh each containing aluminum and copper.
  • the slurry is typically formed by stirring a granular active material, auxiliary conductor, binder, plasticizer, and the like in a state where a solvent is added. The solvent is removed in the subsequent process. In the direction in which the electrode plate 11 is wound, it is preferable that a non-coating portion where a slurry is not applied is present at the beginning and the end of the current collector. A pair of leads corresponding to each electrode plate 11 is attached to the uncoated portion.
  • the first lead 13 attached to the top of the electrode assembly 10 is electrically connected to the cap assembly 30, and the second lead (not shown) attached to the bottom of the electrode assembly 10 is the case 20. Is connected to the bottom of the. Of course, both the first lead 13 and the second lead may be drawn out toward the cap assembly 30.
  • the electrode assembly 10 may be disposed on a first insulating plate (not shown) installed at the bottom of the case 20, and the second insulating plate 14 may be disposed on the upper end of the electrode assembly 10.
  • the first insulating plate insulates between the electrode assembly 10 and the bottom of the case 20, and the second insulating plate 14 insulates between the electrode assembly 10 and the cap assembly 30.
  • the case 20 is made of a lightweight conductive metal material such as aluminum or an aluminum alloy, and has a cylindrical structure having an open upper end and a closed bottom opposite thereto.
  • the electrode assembly 10 and the electrolyte (not shown) are accommodated in the inner space of the case 20.
  • the electrolyte is to move lithium ions generated by the electrochemical reaction of the electrode plate 11 during charging and discharging of the secondary battery 100.
  • the electrolyte may be a polymer using a non-aqueous organic electrolyte or a polymer electrolyte which is a mixture of lithium salts and high purity organic solvents, but the type of electrolyte is not a problem.
  • a metallic center pin (not shown) which prevents the electrode assembly 10 wound in a jelly roll form from being released and serves as a gas passageway inside the secondary battery 100 is provided. It may be inserted.
  • An upper portion of the case 20, that is, an upper portion of the electrode assembly 10 is provided with a beading portion 24 formed to be bent from the outside to the inside to prevent the up and down flow of the electrode assembly 10.
  • the cap assembly 30 is assembled to the opening of the case 20 in a sealed state via the gasket 40, and includes a top cap 32, a PTC 34, a safety vent 36, and a current breaker. (38).
  • the top cap 32 has electrode terminals (not shown) formed to be electrically connected to the outside.
  • the PTC 34 is for blocking the flow of current inside the battery by overheating the battery 100.
  • the safety vent 36 protrudes convexly in the center and is welded with a current interrupt device (CID) 38.
  • the current breaker 38 may be deformed together with the safety vent 36 by the internal pressure of the secondary battery 100, and may be divided into a CID gasket and a CID filter.
  • the gasket 40 has a cylindrical shape with both ends open as a whole, and one end facing the inner surface of the case 20 is bent at a right angle toward the center so as to be placed at an open portion, that is, a clamping portion, of the case 20. Do.
  • the other end of the gasket 40 is straight in the initial stage of assembly and is oriented in the axial direction of the cylindrical gasket 40.
  • the gasket 40 is bent at a right angle toward the center during the pressing process with the case 20 so that the inner circumferential surface and the outer circumferential surface thereof are cap assemblies 30, respectively.
  • the top-cap is folded in close contact with the inner surface of the case 20.
  • the gasket 40 is made of a material such as polyolefine or polypropylene (PP) having electrical insulation, impact resistance, elasticity and durability.
  • the leakage preventing part 50 is formed on the lower surface of the safety vent 36 and the surface of the gasket 40 in contact with the safety vent 36 and has a concave-convex structure having a triangular side surface thereof. That is, the unevenness provided in the safety vent 36 and the unevenness provided in the gasket 40 are closely coupled while being engaged with each other during the clamping operation of the open end of the case 20 to provide a sealing coupling force between the cap assembly 30 and the gasket 40. It can be further strengthened. Therefore, the leakage preventing unit 50 prevents the electrolyte or gas from leaking to the upper portion of the cap assembly 30 until the safety vent 36 ruptures when internal pressure occurs in the secondary battery 100.
  • FIG. 2 is a cross-sectional view illustrating a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • the same components as those described in FIG. 1 are the same members with the same functions.
  • the secondary battery 100 includes a leakage preventing part 60 having a quadrangular shape.
  • the leakage preventing part 60 includes a quadrangular concave-convex structure formed at a contact portion between the safety vent 36 and the gasket 40, respectively.
  • the leakage preventing unit 60 increases the moving distance when the electrolyte or gas leaks from the leakage preventing unit 50 as described above, thereby greatly improving the airtightness between the interfaces even when the external shock or the internal pressure increases.
  • FIGS. 3 and 4 are cross-sectional views respectively illustrating cap assembly portions of a rechargeable battery according to another exemplary embodiment of the present invention.
  • the same components as those described in FIGS. 1 and 2 are the same members with the same functions.
  • the secondary battery 100 includes a circular leakage preventing part 70 and a round leakage preventing part 80, respectively.
  • the leakage preventing part 70 according to the embodiment of FIG. 3 is provided on the surface where the safety vent 36 and the gasket 40 are in contact with each other, and the semicircular recesses and the convex portions are continuously formed, respectively, and the recesses at the interface.
  • the convex portions are structures that respectively correspond to the corresponding convex portions and the recessed portions.
  • the leakage preventing part 80 according to the embodiment of FIG. 4 is provided on the surface where the safety vent 36 and the gasket 40 are in contact with each other, and has a structure in which a substantially round recessed part and an iron part are continuous.
  • the recessed portion and the convex portion are structures which are respectively joined to the corresponding convex portion and the recessed portion.
  • FIG. 5 is a cross-sectional view illustrating a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • the same components as those described in FIGS. 1 to 4 are the same members with the same functions.
  • the secondary battery 200 according to the present exemplary embodiment further includes a second leakage preventing unit 150 in addition to the leakage preventing unit 50 described above.
  • the second leakage preventing part 150 has a protrusion structure provided on the top surface of the top cap 32.
  • This protrusion structure may be in the form of a cone or a triangular pyramid.
  • the pointed portion of the protrusion penetrates the surface of the gasket 40 to be coupled to the gasket 40 and the top-cap.
  • the protrusion structure of the second leakage preventing part 150 may be deformed in the form of unevenness, in which case the unevenness may be formed on the surface of the corresponding gasket 40.
  • FIG. 6 is a schematic cross-sectional view of a modification of the cap assembly of the embodiment of FIG. 5.
  • the same components as those described in FIGS. 1 to 5 are the same members having the same functions.
  • the cap assembly 30 ′ of the secondary battery 200 may include a protrusion leakage preventing part 50 ′ and a top cap 32 formed on the bottom surface of the safety vent 36.
  • the projections 52 and 152 of each leakage preventing portion 50' and 150 ' are formed with a barb formed near the pointed portion ( 54) 154.
  • the barbs 54 and 154 may be formed by the protrusions 52 and 152 on the surface of the gasket 40 while the gasket 40 and the cap assembly 30 are coupled to each other by the case 20 during the clamping operation. To penetrate the barbs 54 and 154 more reliably into the gasket 40 when penetrating, it is to improve the bonding force and the sealing force.
  • FIG. 7 is a schematic cross-sectional view of a cap assembly portion of a rechargeable battery according to another exemplary embodiment of the present invention.
  • the same components as those described in FIGS. 1 to 6 are the same members with the same functions.
  • the secondary battery 300 according to the present exemplary embodiment further includes a third leakage preventing part 250 in addition to the leakage preventing part 50 and the second leakage preventing part 150 described above.
  • the third leakage preventing part 250 includes a protrusion or an uneven structure formed on an inner surface of the case 20 in contact with the gasket 40.
  • the concave-convex or convex may be provided on the surface of the gasket 40 so as to correspond to the convex or concave-convex structure of the case 20.
  • the third leakage preventing part 250 is a part other than the interface between the gasket 40 and the cap assembly 30 when the electrolyte or gas inside the battery is discharged to the outside due to an external shock or an increase in the internal pressure, that is, the case ( It is for the case of being discharged through the inner surface of 20).

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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)
  • Gas Exhaust Devices For Batteries (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/KR2011/001739 2009-09-14 2011-03-11 이차 전지 WO2011115392A2 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/132,767 US8663837B2 (en) 2009-09-14 2011-03-11 Secondary battery

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2010-0023887 2010-03-17
KR1020100023887A KR20110029061A (ko) 2009-09-14 2010-03-17 이차 전지

Publications (2)

Publication Number Publication Date
WO2011115392A2 true WO2011115392A2 (ko) 2011-09-22
WO2011115392A3 WO2011115392A3 (ko) 2011-12-29

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TW (1) TWI453976B (zh)
WO (1) WO2011115392A2 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160012955A (ko) 2014-07-25 2016-02-03 주식회사 엘지화학 원형 이차 전지
CN107230763A (zh) * 2017-07-12 2017-10-03 湖南艾威尔新能源科技有限公司 锂电池绝缘防爆系统
CN113661603A (zh) * 2019-05-08 2021-11-16 株式会社Lg新能源 防止电池壳体被腐蚀的用于圆柱形电池的衬垫及包括该衬垫的圆柱形电池

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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