WO2023132504A1 - 이차전지 - Google Patents
이차전지 Download PDFInfo
- Publication number
- WO2023132504A1 WO2023132504A1 PCT/KR2022/020282 KR2022020282W WO2023132504A1 WO 2023132504 A1 WO2023132504 A1 WO 2023132504A1 KR 2022020282 W KR2022020282 W KR 2022020282W WO 2023132504 A1 WO2023132504 A1 WO 2023132504A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- secondary battery
- vent member
- comonomer
- carbon atoms
- case
- Prior art date
Links
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M50/105—Pouches or flexible bags
-
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
-
- 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
- H01M50/358—External gas exhaust passages located on the battery cover or case
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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 vent member.
- Secondary batteries which are highly applicable to each product group and have electrical characteristics such as high energy density, are used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by an electrical drive source. It is universally applied. These secondary batteries are attracting attention as a new energy source for improving energy efficiency and eco-friendliness in that they do not generate any by-products due to the use of energy as well as the primary advantage of dramatically reducing the use of fossil fuels.
- EVs electric vehicles
- HEVs hybrid electric vehicles
- Types of secondary batteries that are currently widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and the like.
- Such a secondary battery has a structure in which an electrode assembly including at least one unit cell having an anode/separator/cathode structure is accommodated in a case, and a sealant resin inside the case is fused to seal the electrode assembly.
- ignition of the battery may occur due to various causes such as a short circuit inside the secondary battery, overcharging or overdischarging, and temperature control. At this time, the temperature inside the secondary battery rises rapidly, and at the same time, a thermal propagation phenomenon in which heat is transferred to an adjacent cell occurs, and a fire may further increase.
- the problem to be solved by the present invention is to provide a secondary battery with improved safety by inducing gas discharge in a specific direction.
- a case including a housing portion accommodating the electrode assembly, and a sealing portion including a sealant resin and formed to seal the electrode assembly;
- a vent member including a first layer including a resin having a lower melting point than the sealant resin, and a second layer positioned on at least one surface of the first layer and including an adhesive material, and inserted into the vent area,
- It relates to a secondary battery characterized in that the thickness of the second layer is 5 ⁇ m or less.
- the vent area may be located in the sealing part.
- the vent member may be formed to be longer than the sealing portion, so that the vent member is exposed from inside and outside of the case, respectively.
- the second layer may be located on at least one surface of the first layer exposed to the outside of the case.
- the resin having a lower melting point than the sealant resin may include linear low-density polyethylene having a comonomer having 6 or more carbon atoms.
- the resin having a lower melting point than the sealant resin may include linear low density polyethylene having a comonomer having 6 to 8 carbon atoms.
- the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be polymerized in the presence of a metallocene catalyst.
- the content of the comonomer having 6 or more carbon atoms may be 15% by weight or less relative to 100% by weight of the linear low-density polyethylene having a comonomer of 6 or more carbon atoms.
- the polydispersity index (PDI) of the linear low-density polyethylene having the comonomer having 6 or more carbon atoms may be 4 or less.
- a difference between the crystallization temperature of the sealant resin and the crystallization temperature of the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be 10°C or less.
- a crystallization temperature of the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be 90°C to 115°C.
- the weight average molecular weight of the linear low density polyethylene having a comonomer having 6 or more carbon atoms may be 100,000 g/mol to 400,000 g/mol.
- the vent member may be vented at 100°C to 120°C.
- the vent member may be vented at a pressure of 1.5 atm or more.
- the maximum sealing strength of the vent member at 100° C. or higher may be less than 6 kgf/15 mm.
- An average sealing strength of the vent member at 100° C. or higher may be less than 4.5 kgf/15 mm.
- the maximum sealing strength of the vent member at room temperature to 60° C. may be 6 kgf/15 mm or more.
- An average sealing strength of the vent member at room temperature to 60° C. may be 4.5 kgf/15 mm or more.
- a resin having a lower melting point than the sealant resin may have a melting point of 100°C to 130°C.
- the adhesive material may include acrylic polymer, polyurethane, epoxy resin, silicone, butyl rubber, polyisobutylene, or two or more of these.
- the vent area may be located in a corner-side sealing portion of the case.
- the secondary battery may be a pouch type secondary battery.
- a secondary battery according to an exemplary embodiment of the present invention includes a vent member containing a resin having a lower melting point than a sealant resin of a case, so that gas can be discharged in a direction in which the vent member is positioned. Accordingly, the safety of the battery may be improved.
- the secondary battery according to an embodiment of the present invention includes a second layer including an adhesive material on at least one surface of the first layer, the position of the vent member can be fixed, thereby improving the dimensional stability of the battery. .
- FIG. 1 is a diagram illustrating a secondary battery when a vent member does not include a layer containing an adhesive material.
- FIG. 2 shows a secondary battery according to an embodiment of the present invention, including a layer containing an adhesive material on a vent member.
- FIG 3 is an enlarged view of a vent member according to an embodiment of the present invention.
- FIG. 4 shows a secondary battery according to another embodiment of the present invention.
- FIG. 5 is an enlarged view of a cross-section of a vent member portion after the sealing portion of the secondary battery of FIG. 4 is sealed.
- FIG. 6 is an enlarged view of a vent member portion of a secondary battery according to another embodiment of the present invention.
- FIG. 7 is an enlarged view of a vent member portion of a secondary battery according to another embodiment of the present invention.
- FIG. 8 is an enlarged view of a vent member portion of a secondary battery according to another embodiment of the present invention.
- FIG. 9 is a cross-sectional view taken along the BB′ axis of FIG. 2 .
- a secondary battery includes an electrode assembly to which an electrode lead is attached; a case including a housing portion accommodating the electrode assembly, and a sealing portion including a sealant resin and formed to seal the electrode assembly; a lead film covering a portion of an outer surface of the electrode lead and interposed between the electrode lead and the case; a vent area formed on at least a portion of the case; and a vent member including a first layer including a resin having a lower melting point than the sealant resin, and a second layer positioned on at least one surface of the first layer and including an adhesive material, and inserted into the vent area.
- the thickness of the second layer is 5 ⁇ m or less.
- the secondary battery 10 includes an electrode assembly 12 to which an electrode lead 11 is attached and a case 13 .
- the case 13 includes an accommodating part 13a accommodating the electrode assembly 12 and a sealing part 13b formed to seal the electrode assembly 12 .
- the secondary battery 10 includes a lead film 14 .
- the lead film 14 covers a part of the outer surface of the electrode lead 11 and is interposed between the electrode lead 11 and the sealing portion 13b.
- the lead film 14 is interposed between the electrode lead 11 and the sealing portion 13b to help binding of the electrode lead 11 and the sealing portion 13b.
- vent member 15 for inducing gas discharge in a specific direction does not include a layer containing an adhesive material
- the vent member 15 is simply inserted into the case 13 and then the battery is discharged. Sealing.
- the vent member 15 is not properly fixed until the case 13 is sealed, resulting in poor dimensional stability.
- the inventors of the present invention have completed the present invention by finding that the vent member can be properly fixed even before sealing the case to ensure dimensional stability, since a layer containing an adhesive material is positioned on at least one surface of the vent member.
- FIG. 2 shows a secondary battery according to an embodiment of the present invention including a layer containing an adhesive material on a vent member.
- a secondary battery 10 includes an electrode assembly 12 to which an electrode lead 11 is attached and a case 13 .
- the electrode assembly 12 includes a positive electrode plate, a negative electrode plate, and a separator.
- a positive electrode plate and a negative electrode plate may be sequentially stacked with a separator interposed therebetween.
- the positive electrode plate may include a positive electrode current collector made of a thin metal plate having excellent conductivity, for example, aluminum (Al) foil, and a positive electrode active material layer coated on at least one surface thereof.
- the positive electrode plate may include a positive electrode tab made of a metal material, for example, an aluminum (Al) material, at one end. The positive electrode tab may extend and protrude from one end of the positive electrode plate, or may be welded to one end of the positive electrode plate or bonded using a conductive adhesive.
- the negative electrode plate may include a negative electrode current collector made of a conductive metal thin plate, for example, copper (Cu) foil, and a negative electrode active material layer coated on at least one surface thereof.
- the negative electrode plate may include a negative electrode tab formed of a metal material, such as copper (Cu) or nickel (Ni), at one end. The negative electrode tab may extend and protrude from one end of the negative electrode plate, or may be welded to one end of the positive electrode plate or bonded using a conductive adhesive.
- the separator may be interposed between the positive electrode plate and the negative electrode plate to electrically insulate the positive electrode plate and the negative electrode plate from each other, and may be formed in a porous film form so that lithium ions or the like may pass between the positive electrode plate and the negative electrode plate.
- a separator may include, for example, a porous membrane using polyethylene (PE), polypropylene (PP), or a composite film thereof.
- An inorganic coating layer may be provided on the surface of the separator.
- the inorganic coating layer may have a structure in which inorganic particles are bonded to each other by a binder to form an interstitial volume between the particles.
- the electrode assembly 12 includes a jelly-roll (wound type) electrode assembly having a structure in which long sheet-shaped positive electrodes and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive electrodes and negative electrodes cut in units of a predetermined size through a separator.
- a stacked (stacked) electrode assembly sequentially stacked in one state, a bi-cell in which positive and negative electrodes in a predetermined unit are stacked with a separator interposed therebetween, or a stack structure in which full cells are wound /folding type electrode assemblies; and the like.
- the case 13 includes an accommodating portion 13a accommodating the electrode assembly 12 and a sealing portion 13b formed to seal the electrode assembly 12 .
- the sealing portion 13b includes a sealant resin, and the sealant resin may be fused along the outer circumferential surface of the housing portion 13a to seal the electrode assembly 12 .
- the case 13 may be provided in the form of a film having a multi-layer structure of an outer layer for external impact protection, a metal barrier layer for blocking moisture, and a sealant layer for sealing the case.
- the outer layer is other polyester-based films such as poly(ethylene terephthalate) (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, co-polyester, polycarbonate, nylon, etc. It may include, and may be composed of a single layer or multiple layers.
- PET poly(ethylene terephthalate)
- PET polybutylene terephthalate
- polyethylene naphthalate polybutylene naphthalate
- co-polyester polycarbonate
- nylon nylon
- the metal barrier layer may include aluminum, copper, or the like.
- the sealant layer may include a sealant resin and may be composed of a single layer or multiple layers.
- the sealant resin may include polypropylene (PP), acid modified polypropylene (PPa), random polypropylene, ethylene propylene copolymer, or two or more of these.
- the ethylene propylene copolymer may include ethylene-propylene rubber, ethylene-propylene block copolymer, etc., but is not limited thereto.
- the case 13 may be in the form of a pouch.
- the case 13 when the case 13 is in the form of a pouch, it may include an upper pouch and a lower pouch.
- the case 13 when the case 13 includes an upper pouch and a lower pouch, the upper pouch and the lower pouch are disposed so that the sealant resins face each other, and then the opposing sealant resins are fused to each other by heat and pressure to seal the battery.
- the sealing portion 13b may be fused by thermal fusion or ultrasonic waves, but is not particularly limited as long as the sealing portion 13b can be fused.
- the sealing part 13b may be sealed on four sides or three sides at the edge of the case 13 .
- the boundary surface of the upper pouch and the lower pouch is bent so that the electrode assembly accommodating parts 13a formed in the upper pouch and the lower pouch are overlapped. It means a structure in which the edges of the remaining three sides are sealed except for the bent part in
- the electrode lead 11 may be accommodated in the battery case 13 such that a portion thereof is exposed to the outside of the battery case 13 .
- a secondary battery 10 according to an embodiment of the present invention includes a lead film 14 .
- the lead film 14 covers a part of the outer surface of the electrode lead 11 and is interposed between the electrode lead 11 and the sealing portion 13b.
- the lead film 14 is interposed between the electrode lead 11 and the sealing portion 13b to help binding of the electrode lead 11 and the sealing portion 13b.
- the secondary battery 10 includes a vent area (not shown) formed on at least a part of the case 13, and a vent member 15 is provided in the vent area. can be inserted.
- the vent member 15 may improve the safety of the battery by inducing gas discharge in a specific direction when a thermal runaway phenomenon occurs.
- the vent area may be located in the sealing portion 13b.
- the vent area may be located in a sealing portion of a side surface except for a sealing portion of a side where the electrode lead 11 is exposed to the outside.
- the vent area may be located in the sealing part on the side where the electrode lead 11 is exposed to the outside.
- the vent area may be located in the corner-side sealing portion of the case 13 .
- the vent area When the vent area is located in the corner-side sealing portion of the case 13, the amount of gas vented in a direction directly contacting the electrode lead 11, that is, toward the side portion of the electrode lead 11, is minimized. This can further improve battery safety.
- FIG 3 is an enlarged view of a vent member according to an embodiment of the present invention.
- the vent member 15 includes a first layer 15a containing a resin having a lower melting point than the sealant resin, and a first layer 15a located on at least one surface of the first layer 15a and containing an adhesive material. It includes the second layer (15b).
- the vent member 15 includes a resin having a lower melting point than the sealant resin of the sealing portion 13b, the sealing strength of the portion where the vent member 15 is inserted at a high temperature is higher than that of the portion of the case 13 containing the sealant resin. As the sealing strength is lowered, the venting property may be more easily implemented. Accordingly, when a thermal runaway phenomenon occurs, the safety of the battery may be improved by inducing gas discharge in a specific direction.
- the vent member 15 since the vent member 15 includes a second layer 15b including an adhesive material on at least one surface of the first layer 15a including a resin having a lower melting point than the sealant resin, the vent member 15 It is easy to fix the position of the constant. That is, the positional deviation of the vent member 15 can be reduced. For example, the positional deviation of the vent member 15 may be within 0.5 mm.
- vent member 15 may be located in the sealing portion 13b.
- vent member 15 may be exposed to the outside of the case 13 .
- FIG. 4 shows a secondary battery according to another embodiment of the present invention.
- the vent member 15 may be formed to be longer than the sealing portion 13b so that the vent member 15 may be exposed inside and outside the case 13 . That is, one end of the vent member 15 is located inside the battery from the battery inner end of the sealing part 13b, and the other end of the vent member 15 is located outside the battery from the battery outer end of the sealing part 13b. can be located When the vent member 15 has the above structure, the venting effect can be further improved.
- FIG. 5 is an enlarged view of a cross-section of a vent member portion after the sealing portion of the secondary battery of FIG. 4 is sealed.
- the second layer 15b when a part of the vent member 15 is exposed to the outside of the case 13, the second layer 15b is the portion of the first layer 15a exposed to the outside of the case 13. It may be located on at least one side. In the process of sealing the vent member including the second layer 15b after being inserted into the case 13 , the second layer 15b may be pushed out of the case 13 . Accordingly, the second layer 15b may exist only outside the case 13 without existing inside the case 13 . That is, it may be located only on at least one surface of the first layer 15a exposed to the outside of the case 13 .
- the adhesive material of the second layer 15b can accurately fix the vent member 15 to a desired position, but when the sealing portion 13b and the first layer 15a overlap, the adhesive material rather than seals the sealing portion 13b. ) and the first layer 15a may be hindered, thereby reducing the sealing strength between the sealing portion 13b and the first layer 15a.
- the second layer 15b is located on at least one surface of the first layer 15a exposed to the outside of the case 13, a problem in which the sealing strength between the sealing portion 13b and the first layer 15a is lowered is prevented. It may be easier to do.
- vent member 15 and the case 13 may be overlapped through thermal fusion. In another example, the vent member 15 and the case 13 may be overlapped through an adhesive such as glue. In another example, the vent member 15 and the case 13 may be physically coupled to each other through a clip or the like. In another example, at least a portion of the vent member 15 may be embedded in a film constituting the case 13, for example, a sealant resin.
- the thickness of the second layer 15b is 5 ⁇ m or less.
- the thickness of the second layer 15b may be 100 nm to 5 ⁇ m, or 1 to 5 ⁇ m.
- the battery can be sealed during normal operation and gas can be discharged only when the battery operates abnormally.
- the thickness of the second layer 15b exceeds 5 ⁇ m, the thickness of the second layer 15b including the adhesive material is too thick when the sealing portion 13b and the first layer 15a overlap, resulting in sealing The sealing strength between the portion 13b and the first layer 15a is lowered. Accordingly, it is difficult to secure a desired sealing strength during normal operation of the battery.
- the maximum sealing strength during normal operation of the battery is 6 kgf/15 mm may be below.
- the resin having a lower melting point than the sealant resin may include linear low density polyethylene having a comonomer having 6 or more carbon atoms.
- the resin having a lower melting point than the sealant resin includes linear low-density polyethylene having a comonomer having 6 or more carbon atoms, the sealability of the case 13 is excellent, and the case 13 into which the vent member 15 is inserted is sealed at a high temperature. Since the strength is lowered, it may be easy to implement venting characteristics.
- the resin having a lower melting point than the sealant resin may include linear low density polyethylene having a comonomer having 6 to 8 carbon atoms.
- the resin having a lower melting point than the sealant resin may have a melting point of 100 °C to 130 °C, 105 °C to 125 °C, or 110 °C to 120 °C.
- the resin having a lower melting point than the sealant resin includes linear low-density polyethylene having a comonomer of 6 or more carbon atoms
- the linear low-density polyethylene having a comonomer of 6 or more carbon atoms has a temperature of 100 ° C to 130 ° C, or 105 ° C to 125 ° C, or It may have a melting point of 110 °C to 120 °C.
- the sealing strength of the case 13 portion into which the vent member 15 is inserted is lowered at a high temperature, for example, 100° C. or higher, so that the venting characteristics are more realized. It can be easy.
- the melting point of a resin having a lower melting point than that of the sealant resin may be measured using a differential scanning calorimeter (DSC). For example, the temperature of the sample is increased from 30°C to 280°C at 10°C/min, maintained at 280°C for 10 minutes, cooled to 30°C at 10°C/min, and maintained at 30°C for 10 minutes. Thereafter, the melting point may be measured by increasing the temperature from 30° C. to 280° C. at 10° C./min and then maintaining the temperature at 280° C. for 10 minutes.
- DSC differential scanning calorimeter
- the vent member 15 may be vented at 100 °C to 120 °C.
- the vent member 15 may be vented at a pressure of 1.5 atm or more.
- the vent member 15 may be vented at a pressure of 100°C to 120°C and 1.5 atm or more.
- vent member 15 As the vent member 15 is vented in the above-described temperature range and/or the above-mentioned pressure condition, it is easier to induce gas discharge only when the battery is abnormally operating while sealing the battery when the battery is operating normally. can
- the maximum sealing strength of the vent member 15 at 100° C. or higher may be less than 6 kgf/15 mm.
- the vent member 15 satisfies the above-described sealing strength in the above-mentioned temperature range, the sealing strength of the case 13 portion into which the vent member 15 is inserted is reduced at a high temperature, for example, 100 ° C. or higher, and the vent property is deteriorated. It may be easier to implement.
- the maximum sealing strength of the vent member 15 at room temperature to 60° C. may be 6 kgf/15 mm or more.
- the vent member 15 satisfies the above-mentioned sealing strength in the above-described temperature range, even when the vent member 15 is inserted, it has excellent sealing strength during normal operation of the battery, so that it is easy to secure the sealing property of the battery. can do.
- the maximum sealing strength of the vent member 15 at 100 ° C. or higher is less than 6 kgf / 15 mm, and the maximum sealing strength of the vent member 15 at room temperature to 60 ° C. is 6 It may be kgf/15 mm or more.
- the sealing strength of the portion of the case 13 into which the vent member 15 is inserted is reduced at high temperatures, so that the venting characteristics are easily realized, and during normal operation of the battery. It may be easy to secure the sealing property of the battery by having excellent sealing strength.
- the average sealing strength of the vent member 15 at 100° C. or higher may be less than 4.5 kgf/15 mm.
- the vent member 15 satisfies the above-described sealing strength in the above-described temperature range, the sealing strength of the portion of the case 13 into which the vent member 15 is inserted is lowered at high temperatures, so that it is easier to realize the venting characteristics.
- the average sealing strength of the vent member 15 at room temperature to 60° C. may be 4.5 kgf/15 mm or more.
- the vent member 15 satisfies the above-mentioned sealing strength in the above-mentioned temperature range, it is easy to secure the sealing property of the battery by having excellent sealing strength during normal operation of the battery.
- the average sealing strength of the vent member 15 at 100 ° C. or higher is less than 4.5 kgf / 15 mm, and the average sealing strength of the vent member 15 at room temperature to 60 ° C. is 4.5 It may be kgf/15 mm or more.
- the sealing strength of the portion of the case 13 into which the vent member 15 is inserted is lowered at high temperatures, so that the venting characteristics are easily implemented, and during normal operation of the battery It may be easy to secure the sealing property of the battery by having excellent sealing strength.
- the sealing strength of the vent member 15 according to the temperature is measured by cutting the case 13 to a width of 15 mm and a length of 5 cm at the portion where the vent member 15 is inserted, then opening both ends at 180 ° and biting into a UTM jig, It can be measured by performing a tensile test at a speed of 5 mm/min.
- the maximum sealing strength means the maximum value when the case 13 is broken, and the average sealing strength is the case 13 under the condition of 4.5 kgf/15 mm or more when the maximum sealing strength is 4.5 kgf/15 mm or more.
- the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be polymerized in the presence of a metallocene catalyst.
- a metallocene catalyst it may be more advantageous in terms of sealing strength and physical properties than when polymerized in the presence of a Ziegler-Natta catalyst.
- the content of the comonomer having 6 or more carbon atoms in the linear low-density polyethylene having a comonomer of 6 or more carbon atoms is 15% by weight or less relative to 100% by weight of the linear low-density polyethylene having a comonomer of 6 or more carbon atoms, or 12 wt% or less, or 11.8 wt% or less, or 10 wt% or less, or 9 wt% or less, or 8 wt% or less, or 7.6 wt% or less.
- the content of the comonomer having 6 or more carbon atoms is 5% by weight or more, or 7.6% by weight or more, or 8% by weight or more, or 9.0% by weight or more, or 10 wt% or more, or 11.8 wt% or more, or 12 wt% or more.
- the content of the comonomer having 6 or more carbon atoms satisfies the above-described range, it may be easy to prevent a problem in which sealing strength is lowered during normal operation of the battery due to a decrease in intermolecular packing density.
- the content of the comonomer having 6 or more carbon atoms can be measured by H-NMR. For example, after completely dissolving about 10 mg of the sample in about 0.6 mL of trichlorethylene solvent using a heater gun, the sample is sampled in an NMR tube and measured using 1 H-NMR.
- the weight average molecular weight of the linear low density polyethylene having a comonomer having 6 or more carbon atoms is 100,000 g/mol to 400,000 g/mol, or 200,000 g/mol to 350,000 g/mol, or 230,000 g/mol to 300,000 g/mol.
- sealing strength may be more excellent during normal operation of the battery.
- the polydispersity index (PDI) of the linear low density polyethylene having a comonomer having 6 or more carbon atoms is 4 or less, or 3.8 or less, or 3.796 or less, or 3.5 or less, or 3.023 or less, or 3 or less, or 2.7 or less, or 2.674 or less.
- the polydispersity index (PDI) may be 1.0 or more.
- the weight average molecular weight and polydispersity index of the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be measured by gel permeation chromatography (GPC) under the following conditions.
- the crystallization temperature of the sealant resin and the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be similar to each other.
- a difference between the crystallization temperature of the sealant resin and the crystallization temperature of the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be 10°C or less, or 5°C or less.
- a difference between the crystallization temperature of the sealant resin and the crystallization temperature of the linear low-density polyethylene having a comonomer having 6 or more carbon atoms may be 0.1°C or more.
- the battery of the sealant resin and the linear low-density polyethylene having a comonomer of 6 or more carbon atoms is normal.
- the fusing properties during operation may be better.
- the crystallization temperature of the linear low density polyethylene having a comonomer of 6 or more carbon atoms is 90 ° C to 115 ° C, or 95 ° C to 110 ° C, or 100 ° C to 110 ° C, or 105 ° C to 110 ° C can
- the sealant resin and the linear low-density polyethylene having the comonomer having 6 or more carbon atoms may have more excellent fusion properties.
- the crystallization temperature may be measured using a differential scanning calorimeter (DSC). For example, the temperature of the sample is increased from 30°C to 280°C at 10°C/min, maintained at 280°C for 10 minutes, cooled to 30°C at 10°C/min, and maintained at 30°C for 10 minutes. Thereafter, the crystallization temperature may be measured by increasing the temperature from 30° C. to 280° C. at 10° C./min and then maintaining the temperature at 280° C. for 10 minutes.
- DSC differential scanning calorimeter
- the vent member 15 may have a film shape.
- the vent member 15 may be formed to have a predetermined size and a predetermined thickness. In addition, the vent member 15 may be inserted into the case 13 to have a different insertion length or to control the venting pressure and position according to the design.
- the insertion length of the vent member 15 may be 5 to 20 mm.
- the bent surface of the case and one end of the vent member 15 may be in close contact with each other.
- the shape of the vent member 15 may have a structure in which the width becomes narrower toward the outside of the case 13 .
- the safety of the battery can be further improved while the injection angle of the vented gas is reduced.
- the vent member 15 is located in the sealing portion on the side where the electrode lead 11 is exposed to the outside or the sealing portion on the corner side of the case, the vent member 15 is vented in a direction toward the side portion of the electrode lead 11. Since the amount of gas can be minimized, the safety of the battery can be further improved.
- FIG. 6 to 8 are enlarged views of a vent member in a secondary battery according to another embodiment of the present invention.
- the shape of the vent member 15 may be elliptical or stepped, for example. However, the shape of the vent member 15 may be modified into a circular shape, a triangular shape, or a trapezoidal shape.
- the vent member 15 may have an asymmetric step structure.
- the vent member 15 When the vent member 15 is located in the sealing part on the side where the electrode lead 11 is exposed to the outside or the sealing part on the corner side of the case, the step difference between the steps is formed to correspond to the side part of the electrode lead 11. It can be. In this case, the ejection direction of the vented gas may be separated from the side portion of the electrode lead 11 as much as possible.
- the thickness of the vent member 15 may decrease continuously or discontinuously along the direction in which the electrode lead 11 protrudes.
- FIG. 9 is a cross-sectional view taken along the BB′ axis of FIG. 2 .
- the thickness reduction of the vent member 15 may be performed discontinuously in a step shape as shown in FIG. 9 (a) or continuously as shown in FIG. 9 (b).
- the secondary battery may be a cylindrical, prismatic, or pouch-type secondary battery.
- the secondary battery may be a pouch type secondary battery.
- An upper pouch and a lower pouch in which poly(ethylene terephthalate)/aluminum foil/polypropylene resin are sequentially stacked are arranged so that the polypropylene resin faces each other, and then the anode/separator/cathode are stacked in order.
- the electrode assembly was stored.
- linear low-density polyethylene (ExxonMobile, Exceed TM , 1018, melting point: 119 ° C., comonomer content relative to total resin content: 7.6% by weight, weight Average molecular weight: 289,053 g/mol, polydispersity index: 3.023, crystallization temperature: 106° C.)
- PSA pressure sensitive adhesive
- LG Chem, BPSA Barrier Pressure-Sensitive Adhesives
- Linear low-density polyethylene having a comonomer having 6 carbon atoms polymerized in the presence of a metallocene catalyst instead of the linear low-density polyethylene having a comonomer having 6 carbon atoms used in Example 1 (LG Chemical, Lucene TM , SP311, melting point: 119 ° C, resin Content of comonomer relative to total content: 9.0% by weight, weight average molecular weight: 270, 756 g/mol, polydispersity index: 2.674, crystallization temperature: 107° C.), except for using the secondary battery in the same manner as in Example 1. was manufactured.
- linear low-density polyethylene having a comonomer of 6 carbon atoms used in Example 1
- linear low-density polyethylene having a comonomer of 8 carbon atoms polymerized in the presence of a metallocene catalyst (Dow, Elite TM , 5401GT, melting point: 120 ° C., total resin
- a metallocene catalyst Dow, Elite TM , 5401GT, melting point: 120 ° C.
- total resin A secondary battery was prepared in the same manner as in Example 1, except that comonomer content: 11.8% by weight, weight average molecular weight: 251,521 g/mol, polydispersity index: 3.796, crystallization temperature: 105 ° C).
- An upper pouch and a lower pouch in which poly(ethylene terephthalate)/aluminum foil/polypropylene resin are sequentially stacked are arranged so that the polypropylene resin faces each other, and then the anode/separator/cathode are stacked in order.
- the electrode assembly was stored.
- An upper pouch and a lower pouch in which poly(ethylene terephthalate)/aluminum foil/polypropylene resin are sequentially stacked are arranged so that the polypropylene resin faces each other, and then the anode/separator/cathode are stacked in order.
- the electrode assembly was stored.
- linear low-density polyethylene (ExxonMobile, Exceed TM , 1018, melting point: 119 ° C., comonomer content relative to total resin content: 7.6% by weight, weight Average molecular weight: 289,053 g/mol, polydispersity index: 3.023, crystallization temperature: 106° C.)
- PSA pressure sensitive adhesive
- LG Chem, Barrier Pressure-Sensitive Adhesives was applied on both sides of the film to a thickness of 20 ⁇ m, respectively.
- a vent member was prepared by coating to a thickness.
- the maximum sealing strength is obtained by cutting the case where the vent member is inserted into a width of 15 mm and a length of 5 cm, opening both ends at 180 °, biting into a UTM jig, and performing a tensile test at a speed of 5 mm/min at 25 ° C. When carried out, the maximum value when the case was broken was measured.
- the maximum sealing strength at room temperature between the vent member of Comparative Example 2 in which the thickness of the second layer exceeds 5 ⁇ m and the sealing portion of the secondary battery is Example in which the thickness of the second layer is 5 ⁇ m or less It was confirmed that the maximum sealing strength at room temperature between the sealing portion and the vent member of the secondary battery prepared in 1 was much lower than the maximum sealing strength.
- the positional deviation of the vent member was indicated by drawing a line on the secondary battery sealant layer and the outer layer, respectively, to insert the vent member, and then attaching the vent member prepared in Example 1 and Comparative Example 1 to the sealant layer, respectively, and sealing. After sealing, how far the vent member deviated from the line drawn on the outer layer was measured and calculated.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
실시예 1 | 비교예1 | 비교예2 | |
25℃에서의 실링 강도 (kgf/15mm) |
10.6 | 11.1 | 1.5 |
Claims (22)
- 전극 리드가 부착된 전극 조립체;상기 전극 조립체를 수납하는 수납부, 및 실란트 수지를 포함하고 상기 전극 조립체를 밀봉하기 위해 형성된 실링부를 포함하는 케이스;상기 전극 리드의 외면의 일부를 감싸고, 상기 전극 리드와 상기 케이스 사이에 개재된 리드 필름;상기 케이스의 적어도 일부에 형성된 벤트 영역; 및상기 실란트 수지보다 융점이 낮은 수지를 포함하는 제1층, 및 상기 제1층의 적어도 일면에 위치하고 점착성 물질을 포함하는 제2층을 포함하고, 상기 벤트 영역에 삽입되는 벤트 부재;를 포함하고,상기 제2층의 두께가 5 ㎛ 이하인 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 영역이 상기 실링부에 위치하는 것을 특징으로 하는 이차전지.
- 제2항에 있어서,상기 벤트 부재가 상기 실링부보다 길게 형성되어 상기 케이스의 내부와 외부 각각에서 상기 벤트 부재가 노출되는 것을 특징으로 하는 이차전지.
- 제3항에 있어서,상기 제2층이 상기 케이스 외부에 노출된 제1층의 적어도 일면에 위치하는 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 실란트 수지보다 융점이 낮은 수지가 탄소수 6 이상의 코모노머(comonomer)를 가지는 선형 저밀도 폴리에틸렌을 포함하는 것을 특징으로 하는 이차전지.
- 제5항에 있어서,상기 실란트 수지보다 융점이 낮은 수지가 탄소수 6 내지 8의 코모노머를 가지는 선형 저밀도 폴리에틸렌을 포함하는 것을 특징으로 하는 이차전지.
- 제5항에 있어서,상기 탄소수 6 이상의 코모노머를 가지는 선형 저밀도 폴리에틸렌이 메탈로센 촉매의 존재 하에 중합된 것을 특징으로 하는 이차전지.
- 제5항에 있어서,상기 탄소수 6 이상의 코모노머를 가지는 선형 저밀도 폴리에틸렌에서 상기 탄소수 6 이상의 코모노머의 함량이 상기 탄소수 6 이상의 코모노머를 가지는 선형 저밀도 폴리에틸렌 100 중량% 대비 15 중량% 이하인 것을 특징으로 하는 이차전지.
- 제5항에 있어서,상기 탄소수 6 이상의 코모노머를 가지는 선형 저밀도 폴리에틸렌의 다분산성 지수(Poly Dispersity Index; PDI)가 4 이하인 것을 특징으로 하는 이차전지.
- 제5항에 있어서,상기 실란트 수지의 결정화 온도와 상기 탄소수 6 이상의 코모노머를 가지는 선형 저밀도 폴리에틸렌의 결정화 온도의 차이가 10℃ 이하인 것을 특징으로 하는 이차전지.
- 제10항에 있어서,상기 탄소수 6 이상의 코모노머를 가지는 선형 저밀도 폴리에틸렌의 결정화 온도가 90℃ 내지 115℃인 것을 특징으로 하는 이차전지.
- 제5항에 있어서,상기 탄소수 6 이상의 코모노머를 가지는 선형 저밀도 폴리에틸렌의 중량평균분자량이 10만 g/mol 내지 40만 g/mol인 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 부재가 100℃ 내지 120℃에서 벤팅되는 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 부재가 1.5 atm 이상의 압력에서 벤팅되는 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 부재의 100℃ 이상에서의 최대 실링 강도가 6 kgf/15 mm 미만인 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 부재의 100℃ 이상에서의 평균 실링 강도가 4.5 kgf/15 mm 미만인 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 부재의 상온 내지 60℃에서의 최대 실링 강도가 6 kgf/15 mm 이상인 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 부재의 상온 내지 60℃에서의 평균 실링 강도가 4.5 kgf/15 mm 이상인 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 실란트 수지보다 융점이 낮은 수지가 100℃ 내지 130℃의 융점을 가지는 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 점착성 물질이 아크릴계 고분자, 폴리우레탄, 에폭시 수지, 실리콘, 부틸 고무, 폴리이소부틸렌, 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 벤트 영역이 상기 케이스의 코너 측 실링부에 위치하는 것을 특징으로 하는 이차전지.
- 제1항에 있어서,상기 이차전지는 파우치형 이차전지인 것을 특징으로 하는 이차전지.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2023547863A JP2024505729A (ja) | 2022-01-04 | 2022-12-13 | 二次電池 |
EP22919041.8A EP4283773A1 (en) | 2022-01-04 | 2022-12-13 | Secondary battery |
CA3214863A CA3214863A1 (en) | 2022-01-04 | 2022-12-13 | Secondary battery |
CN202280011639.2A CN116868431A (zh) | 2022-01-04 | 2022-12-13 | 二次电池 |
US18/280,622 US20240088493A1 (en) | 2022-01-04 | 2022-12-13 | Secondary Battery |
Applications Claiming Priority (2)
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KR1020220001217A KR102608407B1 (ko) | 2022-01-04 | 2022-01-04 | 이차전지 |
KR10-2022-0001217 | 2022-01-04 |
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WO2023132504A1 true WO2023132504A1 (ko) | 2023-07-13 |
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US (1) | US20240088493A1 (ko) |
EP (1) | EP4283773A1 (ko) |
JP (1) | JP2024505729A (ko) |
KR (1) | KR102608407B1 (ko) |
CN (1) | CN116868431A (ko) |
CA (1) | CA3214863A1 (ko) |
WO (1) | WO2023132504A1 (ko) |
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KR101452945B1 (ko) * | 2014-01-29 | 2014-10-28 | 에스케이이노베이션 주식회사 | 다층 폴리올레핀계 미세다공막 및 그 제조방법 |
KR20170007876A (ko) * | 2015-07-13 | 2017-01-23 | 주식회사 엘지화학 | 저융점 합금을 포함하는 전지케이스 및 그것을 포함하고 있는 전지셀 |
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KR20170007876A (ko) * | 2015-07-13 | 2017-01-23 | 주식회사 엘지화학 | 저융점 합금을 포함하는 전지케이스 및 그것을 포함하고 있는 전지셀 |
JP2018053180A (ja) * | 2016-09-30 | 2018-04-05 | フタムラ化学株式会社 | ポリプロピレン系レトルト用シーラントフィルム及びこれを用いた多層フィルム |
KR20210075476A (ko) * | 2019-12-13 | 2021-06-23 | 주식회사 엘지에너지솔루션 | 벤팅부가 부착된 파우치형 전지셀 및 이의 제조방법 |
KR20220001217A (ko) | 2020-06-29 | 2022-01-05 | (주)에이치비티 | 고점도 도포형 콘크리트 응결지연제 조성물 |
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