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WO2025234561A1 - Batterie secondaire - Google Patents

Batterie secondaire

Info

Publication number
WO2025234561A1
WO2025234561A1 PCT/KR2025/000557 KR2025000557W WO2025234561A1 WO 2025234561 A1 WO2025234561 A1 WO 2025234561A1 KR 2025000557 W KR2025000557 W KR 2025000557W WO 2025234561 A1 WO2025234561 A1 WO 2025234561A1
Authority
WO
WIPO (PCT)
Prior art keywords
region
plate
secondary battery
electrode assembly
paragraph
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.)
Pending
Application number
PCT/KR2025/000557
Other languages
English (en)
Korean (ko)
Inventor
김경태
김도경
김종구
이성준
박정현
김정현
이정수
김영호
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung SDI Co Ltd
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
Application filed by Samsung SDI Co Ltd filed Critical Samsung SDI Co Ltd
Publication of WO2025234561A1 publication Critical patent/WO2025234561A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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.
  • Secondary batteries unlike non-rechargeable primary batteries, are rechargeable and dischargeable.
  • Low-capacity secondary batteries are used in small, portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for motor drives and power storage in hybrid and electric vehicles.
  • These secondary batteries include an electrode assembly comprising a positive and negative electrode, a case housing the electrode assembly, and electrode terminals connected to the electrode assembly.
  • the present invention provides a secondary battery that prevents a short circuit risk between a negative electrode material and a positive electrode current collector (terminal) due to expansion of the negative electrode material during its life.
  • a secondary battery includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a cylindrical case that accommodates the electrode assembly and is electrically connected to the first electrode plate; a current collector plate that is electrically connected to the second electrode plate of the electrode assembly; a terminal that is installed in the case and is electrically connected to the current collector plate; and an insulating plate interposed between the electrode assembly and the current collector plate, wherein the insulating plate may include a first region having a fixed area and shape, and a second region having a deformable area and shape.
  • the insulating plate may be circular in plan.
  • the insulating plate may include a hole provided in the center.
  • the second region may comprise a flexible insulating material.
  • the second region may be fan-shaped with a wider width toward the outside.
  • the central angle ( ⁇ ) of the second region may be between 30 degrees (°) and 180 degrees (°).
  • the insulating plate may be transformed from a triangular pyramid shape with a hole formed in the center before being interposed between the electrode assembly and the current collector plate to a circular shape with a hole formed in the center when being interposed between the electrode assembly and the current collector plate.
  • the second region may have a reduced area before interposition between the electrode assembly and the current collector plate, and an increased area when interposed between the electrode assembly and the current collector plate.
  • the insulating plate may have an outer diameter that decreases as the area of the second region decreases.
  • the electrode assembly includes a substrate tab extending from the second electrode plate, and the maximum outer diameter of the insulating plate may be equal to or less than a diameter of a central region where the substrate tab does not protrude outwardly.
  • the thickness of the second region may be thinner than the thickness of the first region.
  • the insulating plate further includes a connection area connecting the first region and the second region, and the connection area may include a first connection area formed at an end of the first region and a second connection area formed at an end of the second region.
  • the first connection region can be transformed into a heat-bondable material.
  • the insulating plate includes an adhesive member that bonds between the first region and the second region, and the adhesive member can be attached to a side where each of the first region and the second region is in contact.
  • the insulating plate includes an adhesive member that bonds between the first region and the second region, and the adhesive member can be attached to the upper and lower sides of each of the first connection region and the second connection region.
  • the second region may be coupled such that the second connection region overlaps the upper and lower sides of the first connection region of the first region.
  • a secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a cylindrical case that accommodates the electrode assembly and is electrically connected to the first electrode plate; a current collector plate that is electrically connected to the second electrode plate of the electrode assembly; a terminal that is installed in the case and is electrically connected to the current collector plate; and an insulating plate interposed between the electrode assembly and the current collector plate, wherein the insulating plate is formed in a circular shape with a portion cut off, and may include an overlapping region that overlaps at least a portion of the cut portion.
  • the insulating plate may include a hole provided in the center.
  • the overlapping region may be fan-shaped with a wider width toward the outside.
  • the central angle ( ⁇ ) of the overlapping region may be between 0 degrees (°) and 180 degrees (°).
  • the insulating plate may have a triangular pyramidal shape with a steeper slope as the overlapping area of the overlapping region increases.
  • the insulating plate may be transformed from a triangular pyramid shape with a hole formed in the center before being interposed between the electrode assembly and the current collector plate to a circular shape with a hole formed in the center when being interposed between the electrode assembly and the current collector plate, and the overlapping area of the overlapping region may be maximum before being interposed between the electrode assembly and the current collector plate, and the overlapping area of the overlapping region may be minimum when being interposed between the electrode assembly and the current collector plate.
  • the insulating plate may have an outer diameter that decreases as the overlapping area of the overlapping region increases.
  • the electrode assembly includes a substrate tab extending from the second electrode plate, and the maximum outer diameter of the insulating plate may be equal to or less than a diameter of a central region where the substrate tab does not protrude outwardly.
  • the present invention by inserting an insulating plate into the positive electrode collector side tip, a risk of short circuit between the negative electrode compound and the positive electrode collector plate (terminal portion) due to expansion of the negative electrode compound width during the life of the base tab electrode assembly structure can be prevented.
  • FIG. 1 and FIG. 2 are a perspective view and a cross-sectional view illustrating an exemplary cylindrical secondary battery according to one embodiment of the present invention.
  • FIG. 3 is a plan view illustrating an exemplary insulating plate according to one embodiment of the present invention.
  • FIGS. 4A to 4C are perspective views illustrating exemplary insulating plates according to various embodiments of the present invention.
  • FIG. 5 is a perspective view and a plan view of an insulating plate in a raw material state of an exemplary secondary battery according to another embodiment of the present invention.
  • FIG. 6 is a perspective view illustrating an exemplary insulating plate according to another embodiment of the present invention.
  • FIG. 7 is a partial cross-sectional view of an insulating plate and electrode assembly according to various embodiments of the present invention.
  • FIG. 8a and FIG. 8b are drawings schematically showing the configuration of a secondary battery pack according to an embodiment of the present invention.
  • Figure 9a is a perspective view illustrating an exemplary body.
  • FIG. 9b is a drawing for explaining a vehicle including the secondary battery pack of FIG. 8a.
  • first and second are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a “first” component may also be a “second” component.
  • Any configuration being placed “on (or under)” or “above (or below)” a component may mean not only that any configuration is placed in contact with the upper surface (or lower surface) of said component, but also that other configurations may intervene between said component and any configuration placed on (or below) said component.
  • a component is “connected,” “coupled,” or “connected” to another component
  • the components may be directly connected or connected to each other, but that other components may also be “interposed” between the components, or that each component may be “connected,” “coupled,” or “connected” through another component.
  • a part is electrically coupled to another part, this includes not only cases where they are directly connected, but also cases where they are connected with another element in between.
  • one of the cylindrical batteries is selected and the selected battery is described as having a general structure, and in the case of a generally applicable technology, the general structure of the cylindrical battery is described.
  • FIG. 1 and FIG. 2 are a perspective view and a cross-sectional view illustrating an exemplary cylindrical secondary battery (100) according to the present invention.
  • the exemplary secondary battery (100) according to the present invention may include a case (110), an electrode assembly (120), an insulating plate (130), a first current collecting plate (140), and a terminal (160).
  • the exemplary secondary battery (100) may further include a second current collecting plate (150) and/or a cap plate (170).
  • the exemplary secondary battery (100) may further include an insulating member (163, 164) installed between the case (110) and the terminal (160).
  • the case (110) accommodates the electrode assembly (120) and the electrolyte, and together with the cap plate (170), can form the outer shape of the secondary battery (100).
  • the case (110) may include or be referred to as a can, a housing, or an outer material.
  • the case (110) may include an upper surface (111) having a generally circular shape, and a side surface (112) extending downward from an edge of the upper surface (111) by a certain length. The lower portion of the side surface (112) may be open.
  • the upper surface (111) and the side surface (112) of the case (110) may be formed as an integral body.
  • the case (110) may be formed in various shapes, such as a pouch shape, in addition to a circular shape.
  • the case (110) may include a metal such as steel, nickel-plated steel, steel alloy, aluminum, aluminum alloy, deep drawing cold forming (SPCE), or a laminate film or plastic constituting the pouch.
  • SPCE deep drawing cold forming
  • a terminal hole (111a) may be formed through the center of the upper surface (111). A portion of the terminal (160) may be exposed to the outside of the secondary battery (100) through the terminal hole (111a).
  • the case (110) may be provided with a beading part (113) that is recessed inwardly on the upper portion of the cap plate (170) with the cap plate (170) as the center so that the electrode assembly (120) does not come off to the outside.
  • the case (110) may be provided with a crimping part (114) that is bent inwardly on the lower portion of the beading part (113). That is, the crimping part (114) may press the edge of the cap plate (170) through the gasket (180) to firmly fix the cap plate (170).
  • An electrode assembly (120) may be accommodated inside a case (110) together with an electrolyte.
  • the electrode assembly (120) may include or be referred to as an electrode group, an electrode body, or a jelly roll.
  • the electrode assembly (120) may include a first electrode plate (121), a second electrode plate (122), and a separator (123) between the first electrode plate (121) and the second electrode plate (122), and may be wound in a cylindrical shape.
  • a hollow core (not shown) may be provided longitudinally at the center of the electrode assembly (120).
  • a center pin (optional) may be coupled to the core.
  • the first electrode plate (121) may be a positive electrode plate
  • the second electrode plate (122) may be a negative electrode plate.
  • the configuration may be the opposite.
  • the first electrode plate (121) may have a positive electrode active material layer (121a) formed on at least one surface of an aluminum (Al) foil by coating or the like.
  • the positive electrode active material layer (121a) may be a transition metal oxide (LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , etc.).
  • the first electrode plate (121) may have a first electrode non-coated portion on which the positive electrode active material layer (121a) is not formed.
  • the first electrode non-coated portion may be cut into a certain shape by notching or the like to form a plurality of first substrate tabs (121b).
  • the first substrate tabs (121b) may be arranged toward the upper surface (111) of the case (110).
  • first substrate tabs (121b) may be electrically connected to the first current collector plate (140) (i.e., the terminal (160)).
  • first substrate tab (121b) can be bent in one direction and then joined to the first collector plate (140) by welding.
  • the second electrode plate (122) may have a negative electrode active material layer (122a) formed on at least one surface of a copper (Cu) or nickel (Ni) foil by coating, etc.
  • the negative electrode active material layer (122a) may be graphite, carbon, etc.
  • the second electrode plate (122) may have a second electrode non-coated portion on which the negative electrode active material layer (122a) is not formed.
  • the second electrode non-coated portion may be cut into a certain shape by notching, etc., to form a plurality of second substrate tabs (122b).
  • the second substrate tabs (122b) may be arranged toward the bottom of the case (110).
  • the second substrate tabs (112b) may protrude downward from the separator (123) and be electrically connected to the second current collector (150).
  • a portion of the second substrate tab (122b) may be electrically connected to the beading portion (113) of the case (110).
  • the second substrate tab (122b) may be bent in one direction and then welded to the second collector plate (150).
  • the separator (123) can prevent short circuiting between the first electrode plate (121) and the second electrode plate (122) while allowing movement of lithium ions.
  • the separator (123) can be positioned on opposite sides of the first electrode plate (121), or on opposite sides of the second electrode plate (122).
  • the electrode assembly (120) of the above-described structure is electrically connected to the first collector plate (140) and the second collector plate (150), and is electrically connected to the terminal (160) and the case (110), respectively.
  • a compound capable of reversible intercalation and deintercalation of lithium may be used as the cathode active material.
  • a lithiated intercalation compound a compound capable of reversible intercalation and deintercalation of lithium
  • one or more of a composite oxide of lithium and a metal selected from the group consisting of cobalt, manganese, nickel, and combinations thereof may be used.
  • the above composite oxide may be a lithium transition metal composite oxide, and specific examples thereof include lithium nickel-based oxide, lithium cobalt-based oxide, lithium manganese-based oxide, lithium iron phosphate-based compound, cobalt-free nickel-manganese-based oxide, or a combination thereof.
  • Li a A 1-b X b O 2-c D c (0.90 ⁇ a ⁇ 1.8, 0 ⁇ b ⁇ 0.5, 0 ⁇ c ⁇ 0.05); Li a Mn 2-b X b O 4-c D c (0.90 ⁇ a ⁇ 1.8, 0 ⁇ b ⁇ 0.5, 0 ⁇ c ⁇ 0.05); Li a Ni 1-bc Co b X c O 2- ⁇ D ⁇ (0.90 ⁇ a ⁇ 1.8, 0 ⁇ b ⁇ 0.5, 0 ⁇ c ⁇ 0.5, 0 ⁇ 2); Li a Ni 1-bc Mn b X c O 2- ⁇ D ⁇ (0.90 ⁇ a ⁇ 1.8, 0 ⁇ b ⁇ 0.5, 0 ⁇ c ⁇ 0.5, 0 ⁇ 2); Li a Ni b Co c L 1 d G e O 2 (0.90 ⁇ a ⁇ 1.8, 0 ⁇ b ⁇ 0.9, 0 ⁇ c ⁇ 0.5, 0 ⁇ d ⁇ 0.5, 0 ⁇ e ⁇ 0.1); Li a NiG b O
  • A is Ni, Co, Mn, or a combination thereof
  • X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof
  • D is O, F, S, P, or a combination thereof
  • G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof
  • L 1 is Mn, Al, or a combination thereof.
  • a positive electrode for a lithium secondary battery may include a current collector (e.g., a first substrate) and a positive electrode active material layer formed on the current collector.
  • the positive electrode active material layer includes a positive electrode active material and may further include a binder and/or a conductive material.
  • the content of the positive electrode active material may be 90 wt% to 99.5 wt% with respect to 100 wt% of the positive electrode active material layer, and the contents of the binder and conductive material may be 0.5 wt% to 5 wt%, respectively, with respect to 100 wt% of the positive electrode active material layer.
  • Aluminum may be used as the current collector, but is not limited thereto.
  • the negative electrode active material includes a material capable of reversibly intercalating/deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.
  • the material capable of reversibly intercalating/deintercalating the lithium ions may include a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, or a combination thereof.
  • crystalline carbon include graphite such as natural graphite or artificial graphite
  • amorphous carbon include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, and the like.
  • a Si-based negative electrode active material or a Sn-based negative electrode active material may be used as the material capable of doping and dedoping the lithium.
  • the Si-based negative electrode active material may be silicon, a silicon-carbon composite, SiO x (0 ⁇ x ⁇ 2), a Si-based alloy, or a combination thereof.
  • the above silicon-carbon composite may be a composite of silicon and amorphous carbon.
  • the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.
  • the silicon-carbon composite may further comprise crystalline carbon.
  • the silicon-carbon composite may comprise a core comprising crystalline carbon and silicon particles and an amorphous carbon coating layer positioned on the surface of the core.
  • a negative electrode for a lithium secondary battery may include a current collector (e.g., a second substrate) and a negative electrode active material layer formed on the current collector.
  • the negative electrode active material layer includes a negative electrode active material and may further include a binder and/or a conductive material.
  • the negative electrode active material layer may include 90 to 99 wt% of the negative electrode active material, 0.5 to 5 wt% of the binder, and 0 to 5 wt% of the conductive material.
  • the binder may be a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof.
  • a cellulose-based compound capable of imparting viscosity may be further included.
  • the current collector may be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and a combination thereof.
  • An electrolyte for a lithium secondary battery may include a non-aqueous organic solvent and a lithium salt.
  • the above non-aqueous organic solvent acts as a medium through which ions involved in the electrochemical reaction of the battery can move.
  • the above non-aqueous organic solvent may be a carbonate-based, ester-based, ether-based, ketone-based, or alcohol-based solvent, an aprotic solvent, or a combination thereof, and may be used alone or in combination of two or more thereof.
  • a mixture of cyclic carbonate and chain carbonate can be used.
  • a lithium secondary battery may have a separator between the positive and negative electrodes.
  • a separator may be a multilayer film of polyethylene, polypropylene, polyvinylidene fluoride, or two or more layers thereof.
  • the above separator may include a porous substrate and a coating layer comprising an organic material, an inorganic material, or a combination thereof, positioned on one or both sides of the porous substrate.
  • the organic material may include a polyvinylidene fluoride polymer or a (meth)acrylic polymer.
  • the above inorganic materials are Al 2 O 3 , SiO 2 , TiO 2 , SnO 2 , CeO 2 , MgO, NiO, CaO, GaO, ZnO, ZrO 2 , Y 2 O 3 , It may include inorganic particles selected from, but not limited to, SrTiO 3 , BaTiO 3 , Mg(OH) 2 , boehmite, and combinations thereof.
  • the organic and inorganic substances may be mixed and present in one coating layer, or a coating layer including an organic substance and a coating layer including an inorganic substance may be present in a laminated form.
  • the first collector plate (140) may be electrically connected to the electrode assembly (120).
  • the first collector plate (140) may include or be referred to as a first current collector, a first conductor, or a first conductive plate.
  • the first collector plate (140) may be provided in a substantially circular disk shape.
  • the first collector plate (140) may have a circular shape and may be made of the same material as the first electrode plate (121).
  • the first collector plate (140) may be made of aluminum, an aluminum alloy, copper, a copper alloy, nickel, or a nickel alloy.
  • the diameter of the first collector plate (140) may be smaller than the diameter of the case (110). This is to prevent the first collector plate (140) from being electrically connected to the case (110).
  • a first substrate tab (121b) extending/protruding from the electrode assembly (120) may be electrically connected to the upper surface of the first current collector plate (140).
  • the first substrate tab (121b) may be pressed or bent in an inward direction toward the core or in an outward direction away from the core and laser welded to the upper surface of the first current collector plate (140).
  • the first substrate tab (121b) since an insulating plate (130) must be interposed on the electrode assembly (120) side, the first substrate tab (121b) may be pressed in an inward direction toward the core.
  • the first current collector plate (140) may be fixed and electrically connected to the terminal (160) by welding while its upper surface is in contact with the lower surface of the terminal (160). That is, the first collector plate (140) can be a passage for current flow between the first electrode plate (121) of the electrode assembly (120) and the terminal (160).
  • the second current collector (150) may be a current flow path between the second electrode plate (122) of the electrode assembly (120) and the case (110).
  • the second current collector (150) may include or be referred to as a second current collector, a second conductor, or a second conductive plate.
  • the second current collector (150) may be provided in a generally circular disk shape.
  • a second substrate tab (122b) extending/protruding from the electrode assembly (120) may be electrically connected to an upper surface of the second current collector (150).
  • the second substrate tab (122b) may be pressed or bent inwardly toward the core or outwardly away from the core and laser welded to the upper surface of the second current collector (150).
  • the second current collector (150) may include copper, a copper alloy, nickel, a nickel alloy, aluminum, or an aluminum alloy.
  • the second collector plate (150) may include a circular flat portion (151) corresponding to the lower surface of the electrode assembly (120), and an extension portion (152) extending downward from an edge of the flat portion (151).
  • the upper surface of the flat portion (151) may be fixed and electrically connected to the second electrode plate (122) exposed to the upper portion of the electrode assembly (120) by welding while in contact with the lower surface of the electrode assembly (120).
  • the extension portion (152) may extend downward from the edge of the flat portion (151).
  • Such an extension portion (152) may be in contact with and coupled to the beading portion (113) of the case (110).
  • the extension portion (152) may be coupled by welding while in contact with the inner surface of the beading portion (113) of the case (110).
  • the extension portion (152) can be electrically connected to the case (110) by being sandwiched between the bead portion (113) and the gasket (180).
  • the second current collector plate (150) can be a current flow path between the second electrode plate (122) of the electrode assembly (120) and the case (110).
  • the case (110) can be a negative terminal.
  • the terminal (160) can be inserted into a terminal hole (111a) provided on the upper surface (111) of the case (110) and electrically connected to the first collector plate (140).
  • the terminal (160) may be a positive terminal.
  • the terminal (160) and the case (110) may have different polarities.
  • the terminal (160) may be made of the same or similar material as the first collector plate (140) and the first electrode plate (121).
  • the diameter of the terminal (160) at the upper portion exposed to the case (110) and the diameter located inside the case (110) may be larger than the diameter located in the terminal hole (111a).
  • the terminal (160) may include a head (161), which is a portion exposed to the upper portion of the case (110), and a fastening portion (162), which is a portion located inside the case (110) and facing the electrode assembly (120).
  • the terminal (160) may be coupled from the outside to the inside of the terminal hole (111a) of the case (110).
  • the head (161) may be located on the outside of the case (110).
  • the fastening portion (162) may be compressed (compressed) by riveting and pressed with an insulating member (163) interposed on the upper portion of the upper surface (111).
  • the fastening portion (162) may have a diameter that becomes wider as it goes from the terminal hole (111a) toward the inside of the case (110).
  • the head (161) can be pressed against the upper portion of the upper surface (111) with an insulating member (163) interposed therebetween.
  • an insulating member (163) is interposed between the terminal (160) and the terminal hole (111a), so that the terminal (160) and the case (110) can be electrically insulated and sealed.
  • the insulating member (163) may include a first insulating member (163a) and a second insulating member (163b).
  • the first insulating member (163a) and the second insulating member (163b) are formed to surround the terminal hole (111a) of the upper surface (111).
  • the first insulating member (163a) may be formed to surround the outer surface around the terminal hole (111a) and the terminal hole (111a) (or, the first insulating member (163a) may be formed to surround a portion of the inner surface around the terminal hole (111a).
  • the second insulating member (163b) may be formed in a straight shape to surround the inner surface around the terminal hole (111a).
  • the second insulating member (163b) may be interposed between the case (110) and the first collector plate (140).
  • one insulating member (163) may have a form that completely surrounds the periphery of the terminal hole (111a).
  • the size of the insulating member (163) may be larger than the size of the head (161) for insulation from the case (110).
  • This insulating member (163) is coupled between the terminal (160) and the case (110), thereby preventing leakage of the electrolyte and simultaneously preventing a contact short between the case (110) and the electrode assembly (120).
  • the insulating member (163) may include polypropylene, polyethylene, or EPDM (ethylene propylene diene terpolymer) that does not react with the electrolyte.
  • This insulating member (163) may include or be referred to as a gasket, an insulator, an insulating plate, or an insulating film.
  • the connecting member (164) can be inserted into the outer surface of the fastening member (162).
  • the connecting member (164) can be deformed together with the terminal (160) when the terminal (160) is compressed and fixed to the upper surface (111) together with the terminal (160).
  • the connecting member (164) can be made of an insulating material or a metal material.
  • the cap plate (170) is a circular metal plate and can be coupled to the lower portion of the case (110). The lower surface of the cap plate (170) can be exposed to the outside.
  • the cap plate (170) can be coupled to the lower portion of the case (110) with a gasket (180) interposed therebetween, thereby preventing electrical connection with the case (110).
  • the cap plate (170) can be coupled by interposing the gasket (180) between the beading portion (113) and the crimping portion (114) of the case (110). Since the cap plate (170) is not electrically connected to the positive or negative electrode of the electrode assembly (120), there may be no separate electrical polarity.
  • the exemplary secondary battery (100) has a terminal (160) provided on one surface of the case (110) instead of the cap plate (170), so that the negative electrode and the positive electrode can be provided simultaneously on that surface.
  • the cap plate (170) may be formed of aluminum, an aluminum alloy, or an equivalent thereof. Further, in some examples, the cap plate (170) may be composed of iron, nickel-plated iron, stainless steel, aluminum, or an aluminum alloy.
  • the case (110) and the cap plate (170) coupled thereto are collectively referred to as the case.
  • the cap plate (170) may include or be referred to as a vent plate, a cap assembly, a safety vent, a conductive plate, or a sealing plate.
  • the cap plate (170) may further include a vent notch (175) that is provided relatively thinly on the lower or upper surface.
  • the cap plate (170) may include an edge region (172) interposed between the crimping portion (114) and the beading portion (113), and a center region (171) protruding outwardly of the case (110) compared to the edge region (172).
  • the cap plate (170) may be provided with a step such that the edge region (172) is positioned lower than the center region (171).
  • the cap plate (170) may further include a connecting region (173) connecting the center region (171) and the edge region (172). The connecting region (173) may be provided to be inclined.
  • the cap plate (170) may be fixed in a state in which an end portion of the edge region (172) is positioned between the beading portion (113) and the crimping portion (114) of the case (110).
  • a vent notch (175) may be provided on the central region (171). This vent notch (175) ruptures to release internal gas when the internal pressure of the secondary battery (100) is higher than the reference pressure.
  • the cap plate (170) may have a CID function that blocks the current path by deformation due to internal pressure, or a fuse function that blocks the current path by having a portion that melts at high temperature.
  • the gasket (180) may be interposed between the case (110) and the cap plate (170) and may cover the outer periphery of the cap plate (170).
  • the outer surface of the gasket (180) may be in close contact with the beading portion (113) and the crimping portion (114) of the case (110), and the inner surface of the gasket (180) may be in close contact with the outer periphery of the cap plate (170). That is, the gasket (180) may seal and insulate the case (110) and the cap plate (170) at the same time.
  • the gasket (180) may be assembled with the cap plate (170) and may be assembled with the case (110) to form and maintain a cell seal.
  • the side wall of the case (110) and the cap plate (170) may be sealed and insulated by the gasket (180). Additionally, the lower part of the gasket (180) can be positioned between the beading portion (113) and the cap plate (170) to block their contact.
  • the negative electrode active material layer may rise due to the slip of the second electrode plate (e.g., the negative electrode plate), which may cause a short circuit to the first electrode plate (e.g., the positive electrode plate).
  • ignition may occur in a short circuit mode between the positive electrode substrates due to the upper limit of the negative electrode width. That is, the positive electrode current collector tip portion is the most vulnerable portion to a short circuit, and an insulating plate may be interposed between the positive electrode current collector plate and the electrode assembly for insulation.
  • Such an insulating plate can prevent a short circuit between the negative electrode mixture and the positive electrode current collector plate (terminal portion) due to the expansion of the negative electrode mixture width during the lifespan in an electrode assembly structure having a substrate tab.
  • “during the lifespan” may mean that the secondary battery deteriorates due to repeated charging and discharging of the secondary battery.
  • an improved insulating plate (130) capable of preventing short circuiting of an electrode assembly (120) will be described in more detail.
  • Fig. 3 is a plan view illustrating an exemplary insulating plate according to one embodiment of the present invention.
  • Figs. 4a to 4c are perspective views illustrating exemplary insulating plates according to various embodiments of the present invention.
  • an insulating plate (130) may be inserted into the lower portion of the first current collector plate (140).
  • the insulating plate (130) may be positioned between the first current collector plate (140) and the upper portion of the electrode assembly (120).
  • the insulating plate (130) may have a plate shape in which a hollow portion is formed.
  • the insulating plate (130) may have a diameter that is approximately similar to or relatively large than that of the connecting member (164) for fixing the terminal (160), but is not limited thereto.
  • the insulator when inserting the positive electrode insulator, the insulator is inserted with a diameter smaller than the required diameter due to the substrate tab protruding upward before compaction. Therefore, when inserting the electrode assembly that has been compacted or preformed, an unrecoverable area exists and the insulator may move without being fixed. If the insulator moves, the covered area changes and terminal welding defects may occur due to interference with the core.
  • the insulating plate (130) may be partially composed of an elastic material, and may have a narrow outer diameter in a cone shape (e.g., the diameter of the space between the first substrate tabs (121b) that are partially bent before compaction) when inserted into the electrode assembly (120), and a wide outer diameter in a disc shape (e.g., the diameter of the central area where the first substrate tabs (121b) that are compacted do not protrude) after insertion.
  • the elastic material may mean not only an elastic material, but also a material whose area can increase or decrease.
  • the insulating plate (130) may include a first region (131) whose area and shape are fixed, and a second region (132) whose area and shape are deformable.
  • the insulating plate (130) may further include a central hole (133) formed in the center.
  • the diameter (2r 1 ) of the central hole (133) may correspond to the diameter of the core at the center of the electrode assembly (120).
  • “correspondence” means similar or identical to each other.
  • the diameter (2r 1 ) of the central hole (133) may be equal to or smaller than the diameter of the core.
  • Fig. 3 (a) is a plan view illustrating the first region (131) before the second region (132) is combined.
  • Fig. 3 (b) is a plan view illustrating a state in which the first region (131) and the second region (132) are combined, in which the second region (132) has the maximum area.
  • Fig. 3 (c) is a plan view illustrating a state in which the first region (131) and the second region (132) are combined, in which the area of the second region (132) is reduced to the minimum area. That is, Fig. 3 (b) illustrates the insulating plate (130) before being inserted into the electrode assembly (120). In addition, Fig. 3 (c) illustrates the insulating plate (130) upon insertion.
  • the outer diameter (2R 1 ') of the insulating plate (130) may be the minimum outer diameter. And after being inserted into the electrode assembly (120) side, the insulating plate (130) can be restored to its original size (2R 1 ) as shown in (b) of FIG. 3. At this time, the outer diameter (2R 1 ) of the insulating plate (130) may be the maximum outer diameter.
  • the insulating plate (130) may be in the shape of a disc (see (b) of FIG. 3) in which a center hole (133) is formed before being interposed between the electrode assembly (120) and the first current collector (140).
  • the insulating plate (130) may be deformed into the shape of a triangular pyramid (see (c) of FIG. 3 and FIG. 4a) in which a center hole (133) is formed during the process of being interposed between the electrode assembly (120) and the first current collector (140). And in some examples, the insulating plate (130) can be transformed (restored) back into a circular shape (see (b) of FIG. 3) in which a center hole (133) is formed after being interposed between the electrode assembly (120) and the first current collector plate (140).
  • the second region (132) may have a circular sector or fan-shape shape that becomes wider as it goes outward.
  • the central angle ( ⁇ 1 ) of the second region (132) may be approximately 30 degrees (°) to approximately 180 degrees (°). That is, as the central angle ( ⁇ 1 ) of the second region (132) increases, the arc (R ⁇ 1 ) of the second region (132) may increase, and the area of the second region (132) may increase. At this time, the outer diameter of the insulating plate (130) may increase (R 1 '-> R 1 ).
  • the arc (R ⁇ 1 ) of the second region (132) may decrease, and the area of the second region (132) may decrease.
  • the outer diameter of the insulating plate (130) may be reduced.
  • the area of the second region (132) may be reduced when interposed between the electrode assembly (120) and the first current collector (140). That is, the outer diameter of the insulating plate (130) may be reduced as the area of the second region (132) is reduced.
  • the insulating plate (130) may be formed in a circular shape on a plane. The outer diameter of the insulating plate (130) may be reduced upon insertion and then increased after insertion.
  • the second region (132) may be formed of an elastic insulating material.
  • the second region (132) may be formed of a fibrous material such as a non-woven fabric, polyethylene terephthalate (PET), polypropylene (PP), polyimide (PI), etc. that do not react with the electrolyte.
  • the first region (131) may be formed of an insulating material such as polyethylene terephthalate (PET), polypropylene (PP), polyimide (PI), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), and mica that do not react with the electrolyte.
  • PET polyethylene terephthalate
  • PP polypropylene
  • PI polyimide
  • PPS polyphenylene sulfide
  • PEEK polyetheretherketone
  • the insulating plate (130) may further include connection areas (131a, 132a) connecting the first region (131) and the second region (132).
  • the connection areas (131a, 132a) may include a first connection area (131a) formed at an end of the first region (131) and a second connection area (132a) formed at an end of the second region (132).
  • the end of the first region (131) may refer to two short-side portions in the circumferential direction of the first region (131).
  • the end of the second region (132) may refer to left and right side portions connected to the arc of the second region (132).
  • the first region (131) and the second region (132) may be formed of the same material.
  • the first region (131) and the second region (132) may be made of a material that is easily deformed (e.g., non-woven fabric, PI, etc.), they may be used by punching and then deforming a circular shape (donut shape) with a hole formed in the center of the raw material.
  • the first region (131) and the second region (132) may be formed as an integral body.
  • the thickness of the second region (132) can be made thin to lower the rigidity and create deformation.
  • the first region (131) and the second region (132) may be formed of different materials.
  • the second region (132) may be formed of a material that is more easily deformed than the first region (131). That is, the first region (131) may be formed of a material that is more rigid than the second region (132).
  • the first connection region when the first region (131) and the second region (132) are formed of different materials or the thickness of the second region (132) is thinner than that of the first region (131), the first connection region can be transformed into a material that can be bonded by heat.
  • heat can be applied to the first region (131) to melt the first connection region (131a), and then the second connection region (132a) of the second region (132) can be bonded. That is, after the first connection region (131a) of the first region (131) is melted, the second connection region (132a) of the second region (132) can be attached to the first connection region (131a).
  • the insulating plate (130) may have an adhesive member (not shown, for example, double-sided tape, a material that is changed into a double-sided adhesive member by a chemical reaction, etc.) that bonds the first region (131) and the second region (132).
  • the adhesive member may be attached to the side where the first region (131) and the second region (132) are in contact, respectively.
  • first connection region (131a) and the second connection region (132a) may be the side where the first region (131) and the second region (132) are in contact, respectively, and the adhesive member may be attached to at least one of the first connection region (131a) and the second connection region (132a).
  • the insulating plate (130) may have an adhesive member (134) that overlaps and is attached to at least a portion of the first region (131) and at least a portion of the second region (132) to couple the first region (131) and the second region (132).
  • At least a portion of the first region (131) may refer to a region adjacent to the second region (132), and at least a portion of the second region (132) may refer to a region adjacent to the first region (131).
  • the first connecting region (131a) may include not only a side surface that is in contact with a side surface of the second region (132), but also a portion of the upper and lower surfaces of the first region (131) adjacent to the second region (132).
  • the second connection area (132a) may include not only the side that is in contact with the side of the first area (131), but also a portion of the upper and lower surfaces of the second area (132) adjacent to the first area (131).
  • the adhesive member (134) may be attached to the upper and lower surfaces of each of the first connection area (131a) and the second connection area (132a).
  • the adhesive member (134) may be composed of a tape, film, or the like that has adhesiveness on one surface.
  • the present invention is not limited thereto, and various adhesive-capable materials may be used.
  • the second region (1321) may be coupled such that the second connection region (1321a) overlaps the upper and lower surfaces of the first connection region (131a) of the first region (131).
  • the second region (1321) may have a larger area than the second region (132) described above, since it includes an overlapping region.
  • the second region (1321) may be formed in a tape-like shape. Accordingly, the second region (1321) may be adhered to the upper and lower surfaces of the first region (131), respectively.
  • an adhesive material (not shown, for example, double-sided tape, a material that changes into a double-sided adhesive material by chemical action, etc.) may be attached to the overlapping position of the first connection area (131a) and the second connection area (1321a), so that the first connection area (131a) and the second connection area (1321a) may be bonded at the overlapping area.
  • Fig. 5 is a perspective view and a plan view of an insulating plate in a raw material state of an exemplary secondary battery according to another embodiment of the present invention.
  • Fig. 6 is a perspective view illustrating an exemplary insulating plate according to another embodiment of the present invention.
  • (a) of Fig. 5 is a perspective view of an insulating plate (231a) in a raw material state.
  • Fig. 5 (b) is a plan view illustrating a state in which an overlapping area (232) is not overlapped, and the overlapping area of the overlapping area (232) is minimal.
  • Fig. 5 (c) is a plan view illustrating a state in which an overlapping area (232) is overlapped, and illustrates a case in which at least a portion of the overlapping area (232) is overlapped.
  • the insulating plate (230) may be formed in a circular shape with a portion cut off, and may include an insulating region (231) in the circular shape with a portion cut off, and an overlapping region (232) that overlaps at least a portion of the cut portion of the insulating region (231).
  • the overlapping region (232) may refer to a portion where at least a portion of the cut portion of the insulating region (231) overlaps.
  • the insulating plate (230) may further include a central hole (233) formed in the center.
  • the overlapping region (232) may have a fan shape that becomes wider as it goes outward.
  • the insulating plate (231a) in the raw material state can be provided in a spring manner.
  • the cutting line (C) can be formed and cut at one turn or more.
  • (b) of Fig. 5 shows the insulating plate (230) before being inserted into the electrode assembly (120).
  • (c) of Fig. 5 shows the insulating plate (230) upon insertion.
  • the outer diameter (2R 2 ') of the insulating plate (230) can be the minimum outer diameter.
  • the insulating plate (230) can be restored to the original size (2R 2 ) as shown in (b) of Fig. 5.
  • the outer diameter (2R 2 ) of the insulating plate (230) can be the maximum outer diameter.
  • the insulating plate (230) may be in the shape of a disc (see (b) of FIG. 5) with a center hole (233) formed therein before being interposed between the electrode assembly (120) and the first collector plate (140).
  • the insulating plate (230) may be deformed into the shape of a triangular pyramid (see (c) and FIG. 6) with a center hole (233) formed therein during the process of being interposed between the electrode assembly (120) and the first collector plate (140).
  • the insulating plate (230) may be deformed (restored) back into the shape of a disc (see (b) of FIG. 5) with a center hole (233) formed therein after being interposed between the electrode assembly (120) and the first collector plate (140). Therefore, as the amount of overlap (overlapping amount) of the overlapping area (232) increases, the outer diameter of the insulating plate (230) may decrease. As the overlapping area of the overlapping region (232) increases, the outer diameter of the insulating plate (230) may decrease. In some examples, after insertion, the outer diameter of the insulating plate (230) may increase again through a compaction process, and the overlapping amount of the overlapping region (232) may decrease. In addition, (c) of FIG. 5 may represent a collector plate whose outer diameter is relatively reduced as the area of the overlapping region (232) increases. In this case, the outer diameter (2R 2 ') of the insulating plate (230) may not be the minimum outer diameter.
  • the central angle ( ⁇ 2 ) of the overlapping area (232) may be from about 0 degrees (°) to about 180 degrees (°). In some examples, as the central angle ( ⁇ 2 ) of the overlapping area (232) increases, the arc (R ⁇ 2 ) of the overlapping area (232) may increase, and the area of the overlapping area (232) may increase.
  • the increase in the area of the overlapping area (232) means that the overlapping area in the overlapping area (232) increases, and the outer diameter of the insulating plate (230) may be relatively reduced (R 2 -> R 2 ').
  • the arc (R ⁇ 2 ) of the overlapping area (232) may decrease. This reduces the overlapping area of the overlapping region (232), so that the outer diameter of the insulating plate (230) can relatively increase (R 2 '-> R 2 ).
  • the center angle is approximately 0 degrees (°)
  • the overlapping areas (232) may be completely overlapped, and when the center angle is approximately 180 degrees (°), the overlapping areas (232) may not be overlapped.
  • the area of the overlapping area (232) may decrease when interposed between the electrode assembly (120) and the first collector plate (140). That is, the outer diameter of the insulating plate (230) may decrease as the overlapping area of the overlapping area (232) increases.
  • the insulating plate (230) may be deformed into a triangular pyramid shape with a steeper slope as the overlapping area of the overlapping region (232) increases. That is, as the overlapping area of the overlapping region (232) increases, the outer diameter of the insulating plate (230) may decrease. In some examples, the area of the overlapping region (232) of the insulating plate (230) may be maximum before being interposed between the electrode assembly (120) and the current collector (140), and the area of the overlapping region (232) may be minimum upon interposition.
  • the insulating plate (230) may be formed in a circular shape on a plane.
  • the insulating plate (230) may have an outer diameter that decreases when the overlapping area (232) overlaps during insertion, and then increases again when the insertion is completed (compaction is completed).
  • the insulating plate (230) may be made of an insulating material that does not react with the electrolyte, such as polyethylene terephthalate (PET), polypropylene (PP), polyimide (PI), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), and mica.
  • Fig. 7 is a partial cross-sectional view of an insulating plate and electrode assembly according to various embodiments of the present invention.
  • Fig. 7 (a) is a cross-sectional view showing a state in which insulating plates (130, 230) are joined before substrate compaction
  • Fig. 7 (b) is a cross-sectional view showing a state in which insulating plates (130, 230) are restored to their original size after substrate compaction.
  • the first substrate tab (121b) extending from the first electrode plate (121) may be bent before compaction.
  • the outer diameter of the insulating plate (130, 230) may be minimized so as not to touch the bent first substrate tab (121b), so that the insulating plate (130, 230) may be inserted into the electrode assembly (120) side. That is, the minimum outer diameter (2R 1 ', 2R 2 ') of the insulating plate (130, 230) may be equal to or smaller than the diameter of the central region between some of the bent substrate tabs (121b).
  • the radius (R') of the triangular pyramid shape can be calculated by R(1- ⁇ /2 ⁇ ).
  • the first substrate tab (121b) extended from the first electrode plate (121) is compacted, and the restored insulating plate (130, 230) can be inserted into the electrode assembly (120) side.
  • the maximum outer diameter (2R 1 , 2R 2 ) of the insulating plate (130, 230) can be approximately similar to or equal to the diameter (d) of the central region from which the first substrate tab (121b) does not extend.
  • the maximum reduced length (R-R') can be calculated based on the length of the bent first substrate tab (121b) and the bending angle ( ⁇ 3 , preforming step) of the first substrate tab (121b).
  • the length (L) of the bent first substrate tab (121b) can be approximately 3.5 mm
  • the bending angle ( ⁇ 3 ) of the first substrate tab (121b) can be approximately 30 degrees (°) to approximately 60 degrees (°).
  • the diameter of the central region between the bent substrate tabs (121b) may also increase.
  • the radius (R) of the insulating plate (130, 230) may be approximately 6 mm to approximately 12 mm
  • the length (L) of the substrate tab (121b) may be approximately 3 mm to approximately 4 mm.
  • the radius (R) of the current collector plate may be approximately 4 mm to approximately 8 mm
  • the length (L) of the first substrate tab (121b) may be approximately 2 mm to approximately 3 mm. That is, the maximum outer diameter (2R) and minimum outer diameter (2R') of the insulating plate (130, 230) may vary depending on design changes such as the size of the secondary battery (100), the length of the first substrate tab (121b), and the bending angle.
  • FIGS. 8a and 8b are drawings schematically showing the configuration of a secondary battery pack (30) according to an embodiment of the present invention.
  • the secondary battery pack (30) may include a plurality of secondary battery modules (20) and a housing (31) for accommodating the plurality of secondary battery modules (20).
  • the housing (31) may include first and second housings (31-1, 31-2) that are coupled in a direction facing each other with the plurality of secondary battery modules (20) interposed therebetween.
  • the plurality of secondary battery modules (20) may be electrically connected to each other using a bus bar (25), and the plurality of secondary battery modules (20) may be electrically connected to each other in a series/parallel or series-parallel mixed manner to obtain a required electrical output.
  • components such as a bus bar, a cooling unit, and an external terminal for electrically connecting the secondary batteries (batteries) are omitted.
  • the secondary battery pack (30) can be mounted on a vehicle (50).
  • vehicle (50) may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle.
  • the vehicle includes a four-wheeled vehicle or a two-wheeled vehicle.
  • Fig. 9a is a perspective view illustrating an exemplary vehicle body (40).
  • Fig. 9b is a drawing for explaining a vehicle (50) including the secondary battery pack (30) of Fig. 8a.
  • the secondary battery pack (30) may include a secondary battery pack cover (31-1) (which may correspond to the first housing) which is a part of a vehicle underbody (41) and a pack frame (31-2) (which may correspond to the second housing) which is disposed at a lower portion of the vehicle underbody (41).
  • the secondary battery pack cover (31-1) and the pack frame (31-2) may be formed integrally with the vehicle floor (42).
  • the vehicle underbody (41) separates the inside and the outside of the vehicle, and the pack frame (12) may be disposed at the outside of the vehicle.
  • the vehicle (50) may be formed by combining additional components such as a hood (51) at the front of the vehicle and fenders (52) positioned at the front and rear of the vehicle, respectively, with the vehicle body (40).
  • the vehicle (50) includes a secondary battery pack (30) including a secondary battery pack cover (31-1) and a pack frame (31-2), and the secondary battery pack (30) may be combined with the vehicle body (40). That is, the vehicle operates by receiving power from the secondary battery pack (30) according to one embodiment of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente divulgation concerne une batterie secondaire. Le problème technique à résoudre est de fournir une batterie secondaire comprenant une plaque isolante insérée dans l'extrémité avant d'un côté de collecte de courant d'électrode positive, de façon à empêcher le risque de court-circuit entre un mélange d'électrode négative et une plaque de collecte de courant d'électrode positive (unité de borne) en raison de l'expansion en largeur du mélange d'électrode négative dans une structure d'ensemble électrode de languette de substrat pendant la durée de vie. À cet effet, la présente divulgation propose une batterie secondaire comprenant : un ensemble électrode comprenant une première plaque d'électrode, une seconde plaque d'électrode et un séparateur ; un boîtier cylindrique pour recevoir l'ensemble électrode et connecté électriquement à la première plaque d'électrode ; une plaque collectrice de courant connectée électriquement à la seconde plaque d'électrode de l'ensemble électrode ; une borne installée dans le boîtier et connectée électriquement à la plaque collectrice de courant ; et une plaque isolante interposée entre l'ensemble électrode et la plaque collectrice de courant, la plaque isolante comprenant une première région ayant une superficie et une forme fixes, et une seconde région ayant une superficie et une forme déformées.
PCT/KR2025/000557 2024-05-09 2025-01-09 Batterie secondaire Pending WO2025234561A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020240060951A KR20250161768A (ko) 2024-05-09 2024-05-09 이차 전지
KR10-2024-0060951 2024-05-09

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WO2025234561A1 true WO2025234561A1 (fr) 2025-11-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2025/000557 Pending WO2025234561A1 (fr) 2024-05-09 2025-01-09 Batterie secondaire

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Country Link
KR (1) KR20250161768A (fr)
WO (1) WO2025234561A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001185118A (ja) * 1999-12-28 2001-07-06 Nec Corp 円筒形電池およびその製造方法
JP2003317805A (ja) * 2002-04-19 2003-11-07 Matsushita Electric Ind Co Ltd 円筒型リチウムイオン二次電池およびその製造方法
KR100719730B1 (ko) * 2005-12-29 2007-05-17 삼성에스디아이 주식회사 원통형 리튬 이차전지
JP5715155B2 (ja) * 2010-11-16 2015-05-07 株式会社日立製作所 円筒形二次電池
KR20230074006A (ko) * 2021-11-19 2023-05-26 주식회사 엘지에너지솔루션 절연테이프, 젤리롤, 이차 전지, 배터리 팩 및 자동차

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001185118A (ja) * 1999-12-28 2001-07-06 Nec Corp 円筒形電池およびその製造方法
JP2003317805A (ja) * 2002-04-19 2003-11-07 Matsushita Electric Ind Co Ltd 円筒型リチウムイオン二次電池およびその製造方法
KR100719730B1 (ko) * 2005-12-29 2007-05-17 삼성에스디아이 주식회사 원통형 리튬 이차전지
JP5715155B2 (ja) * 2010-11-16 2015-05-07 株式会社日立製作所 円筒形二次電池
KR20230074006A (ko) * 2021-11-19 2023-05-26 주식회사 엘지에너지솔루션 절연테이프, 젤리롤, 이차 전지, 배터리 팩 및 자동차

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