Abstract: A secondary battery configured to have a structure in which an electrode assembly is received in a battery case together with an electrolytic material, wherein the battery case is provided therein with a space for receiving the electrode assembly and wherein the battery case is made of a thermoplastic resin, which can be injection-molded. An injection mold may be formed such that the size of the mold corresponds to the thickness of the electrode, thereby solving a problem in which the formability of a conventional laminate sheet including a metal layer is low. In addition, a process of forming the laminate sheet and a process of sealing the battery case using a pressing member, which are essentially required in order to use the laminate sheet, may be omitted, whereby a manufacturing process is simplified and thus productivity is improved.

Abstract: A method for manufacturing a pouch case for a secondary battery includes the steps of: (S1) preparing a pouch exterior for a secondary battery including a structure in which a substrate layer, a barrier layer, and a sealant layer are sequentially stacked; (S2) reducing a modulus of the sealant layer by 20-50%; and (S3) molding the pouch exterior for a secondary battery to form a cup part.

Abstract: A battery cell evaluation method is provided. The method includes molding a pouch film to form a receiving part to which an electrode assembly is mounted, providing an impact to at least one of corners of the receiving part, storing the pouch film inside a second container together with a first container configured to contain an electrolytic solution, and detecting presence or absence of peeling of an outer layer of the pouch film.

Abstract: A method for manufacturing a pouch case for a secondary battery includes the steps of: (S1) preparing a pouch exterior for a secondary battery including a structure in which a substrate layer, a barrier layer, and a sealant layer are sequentially stacked; (S2) molding the pouch exterior for a secondary battery to form a cup part; and (S3) reducing cracks of the sealant layer of the pouch exterior for a secondary battery.

Abstract: A battery case for a secondary battery according to an embodiment of the present invention can include a cup part having an accommodation space configured to accommodate an electrode assembly in which electrodes and separators are stacked, a sealing part extending to the outside of the cup part, and a gas discharge part which is attached to a hole formed to be punched in at least one of the cup part or the sealing part and through which a gas passes. The gas discharge part can include a melted layer comprising a thermoplastic resin that is melted when heat is applied, and a thermosetting layer laminated on one surface of the melted layer and comprising a thermosetting resin that is not melted by heat.

Abstract: A pouch film according to an embodiment of the present invention includes a first polymer layer, an adhesive layer disposed on one surface of the first polymer layer, a gas barrier layer disposed on the adhesive layer and comprising a sintered body of metal particles, and a second polymer layer laminated on one surface of the gas barrier layer.

Abstract: A method of manufacturing a pouch-type secondary battery comprising the steps of: (a) preparing an electrode assembly having a separator interposed between a positive electrode and a negative electrode; (b) forming a receiving part for the electrode assembly in a case made of a laminate sheet; and (c) manufacturing a battery cell by receiving the electrode assembly in the receiving part and thermally fusing the case, wherein the laminate sheet comprises an outer resin layer, a metal barrier layer and an inner resin layer, the inner resin layer comprising polypropylene or polyethylene, and a crosslinking agent.

Abstract: A battery case for a secondary battery according to an embodiment of the present invention can include a cup part having an accommodation space configured to accommodate an electrode assembly in which electrodes and separators are stacked; a sealing part extending to the outside of the cup part; a gas discharge part attached to a hole which is formed to be punched in at least one of the cup part or the sealing part from the outside and through which a gas passes; and a coating part applied to an inner circumferential surface of the hole and having electrolyte resistance, wherein the gas discharge part includes: a gas discharge layer through which the gas passes; and an outer functional layer formed on an outer surface of the gas discharge layer and having a hydrophobic property.

Abstract: A method for a pouch film according to an embodiment of the present invention includes: a step of applying an adhesive on one surface of a first polymer layer; a step of depositing metal particles on the adhesive; a step of applying heat and a pressure to the deposited metal particles to sinter the metal particles and thereby forming a gas barrier layer; and a step of laminating a second polymer layer on one surface of the gas barrier layer.

Abstract: A battery case for a secondary battery according to an embodiment of the present invention for achieving the object can include a cup part provided with an accommodation space configured to accommodate an electrode assembly formed by stacking an electrode and a separator; a sealing part extending outward from the cup part; and a gas discharge part which is attached from the inside to a hole formed by perforating at least one of the cup part or the sealing part and through which a gas passes. The gas discharge part can include a gas discharge layer through which the gas passes; and an outer functional layer which is formed on an outer surface of the gas discharge layer and has hydrophobicity.

Abstract: The present invention relates to a method for forming a pouch, and the method for forming the pouch according to the present invention comprises: a curling process of bending a pouch sheet in a round shape; a seating process of seating the bent pouch sheet on a lower mold, in which a molding groove is formed; and a forming process of pressing the pouch sheet by using a punch mold to form an accommodation part, in which an electrode assembly is accommodated, in the pouch sheet.

Abstract: A battery case for a secondary battery according to an embodiment of the present invention can include a cup part having an accommodation space configured to accommodate an electrode assembly in which electrodes and separators are stacked; a sealing part extending to the outside of the cup part; a gas discharge part attached to a hole which is formed to be punched in at least one of the cup part or the sealing part from the outside and through which a gas passes; and a coating part applied to an inner circumferential surface of the hole and having electrolyte resistance, wherein the gas discharge part includes: a gas discharge layer through which the gas passes; and an outer functional layer formed on an outer surface of the gas discharge layer and having a hydrophobic property.

Abstract: A secondary battery may include: an electrode assembly in which an electrode and a separator are alternately stacked; a plurality of pouches that surrounds the electrode assembly and seals the electrode assembly; and a spring part that is coupled to the outermost pouch of the plurality of pouches and provides a degree of structural rigidity of the outermost pouch. Additionally, a secondary battery may include: an electrode assembly in which an electrode and a separator are alternately stacked; a plurality of pouches that surrounds the electrode assembly and seals the electrode assembly; an open portion formed at one side of the outermost pouch of the plurality of pouches and passing through a portion of the one side; and a spring part that is coupled to both ends of the open portion and provides a degree of structural rigidity of the outermost pouch.

Abstract: A pouch type secondary battery according to the present invention includes: an electrode assembly; a battery case accommodating the electrode assembly in an inside thereof; an electrode tab protruding from the electrode assembly; a first electrode lead having an inner end connected to the electrode tab; a second electrode lead having an inner end coupled to an outer end of the first electrode lead and an outer end extending outside of the battery case; a connection part coupling the first and second electrode leads to each other; an insulation part fused around a portion of each of the first and second electrode leads, the insulation part bonding the first and second electrode leads to the battery case; and a fusion prevention part located at a position at one surface of the first electrode lead, the fusion prevention part preventing the first electrode lead from being fused to the insulation part.

Abstract: The present disclosure relates to an electrode lead for an electrochemical device, including a nickel plating layer disposed on the surface of a metallic terminal, having a surface irregularity structure on the nickel plating layer, and including a polar group-containing coating layer. The present disclosure also relates to an electrochemical device including the electrode lead. The electrode lead for an electrochemical device provides increased binding force between the electrode lead and the lead film by increasing the contact area between the electrode lead and the lead film, while not causing damages upon the surface of the electrode lead.

Abstract: The present disclosure relates to a secondary battery. The secondary battery may include an electrode assembly including a plurality of positive electrode plates with each plate having a positive electrode tab, a plurality of negative electrode plates with each plate having a negative electrode tab, and a plurality of separators with each separator interposed between a positive electrode plate and a negative electrode plate, a case accommodating the electrode assembly, and a tab welding portion comprising welded overlapping positive electrode tabs and welded overlapping negative electrode tabs. A length of the tab welding portion in an extension direction of the positive electrode tab or the negative electrode tab may be constant or different across a thickness direction of the positive electrode tab or the negative electrode tab.

Abstract: A venting device inserted into a sealing part of a pouch of a secondary battery according to an embodiment of the present invention includes: a housing inserted between confronting surfaces of the sealing part so as to be sealed together with the sealing part, the housing being made from a metal plate; a gasket made of a polymer and disposed in the housing and through which a passage is defined providing gas communication between an inside and an outside of the pouch; and a plate spring made of a metal, the plate spring being disposed in the housing and assembled with the gasket, the plate spring being configured to open and close the passage in response to a change in an internal pressure of the pouch, wherein the housing includes a crimping part crimped together with the gasket on an upper end of the housing.

Abstract: Disclosed are a pouch-shaped battery cell including a pouch-shaped battery case made of a laminate sheet, an electrode assembly received in the pouch-shaped battery case, and a venting portion configured to discharge gas in the pouch-shaped battery case, wherein the pouch-shaped battery case is provided with an opening, and the opening is opened or closed by the venting portion attached to the inside of the opening, and wherein the venting portion is opened to rapidly discharge gas when pressure in the pouch-shaped battery cell increases and reversibly blocks the inside and the outside of the battery cell, and a method of manufacturing the same.

Abstract: The present invention relates to a pouch-shaped battery sealing apparatus including a stopper capable of adjusting a thickness after sealing in a process of sealing the outer edge of a battery case made of a laminate sheet by applying heat and pressure thereto when a pouch-shaped battery is manufactured and a pouch-shaped battery sealing method using the same.

Abstract: The present invention relates to a pouch-shaped battery sealing apparatus including a position adjustment unit capable of adjusting relative positions of an electrode lead and an insulative film before sealing during a process of applying heat and pressure to an outer periphery of a battery case made of a laminate sheet to seal the outer periphery of the battery case when a pouch-shaped battery is manufactured and a pouch-shaped battery sealing method using the same.