Abstract: A secondary battery includes an electrode assembly, in which electrodes and separators are alternately stacked, and a battery case, in which an accommodation part accommodating the electrode assembly is formed. A sealing part is formed along an outer circumferential surface of the battery case. The secondary battery also includes a connection pipe having one side connected to the accommodation part of the battery case and the other side connected to the outside of the battery case and passing through the battery case, and an aroma valve connected to the other side of the connection pipe 140. The aroma valve is disposed outside the battery case so as to be opened to discharge an internal gas when an internal pressure of the battery case is greater than or equal to a predetermined pressure.

Abstract: A secondary battery includes an electrode assembly and an electrolyte that are inserted and injected into a pouch. An edge of the pouch is sealed to form a sealing portion. The secondary battery also includes a valve fixed to the sealing portion. The valve includes a body forming a passage having opened one end facing the inside of the pouch and provided with a chamber connected to the passage, wherein a discharge hole communicating with the outside is formed in the chamber. The valve also includes a gate seated on a hook protrusion forming a boundary between the passage and the chamber to open or close the passage. The valve also includes a spring mounted to apply elastic force in a direction in which the gate is closed.

Abstract: A secondary battery is provided with a pouch, in which a sealing portion formed on an edge of the pouch is sealed when an electrode assembly and an electrolyte are enclosed. The secondary battery includes a valve which is mounted on a sealing portion so that one end the valve is disposed inside the pouch, and the other end of the valve is disposed outside the pouch and discharges a gas generated inside the pouch to the outside. The valve comprises an inner tube filled with an adhesive and made of a material that is deformed when swelling occurs. When the swelling occurs to increase in pressure inside the pouch, a gap is generated in a portion that is filled with the adhesive, and the gas within the pouch is discharged to the outside though the gap.

Abstract: A secondary battery comprises: an electrode assembly to which an electrode lead is coupled; a pouch comprising an accommodation part configured to accommodate the electrode assembly with a front end of the electrode lead withdrawn to the outside, and a sealing part formed along a circumference of the accommodation part to seal the accommodation part; and a gas discharge part provided in the pouch to discharge a gas from the inside to the outside of the pouch and block an inflow of moisture from the outside to the inside of the pouch, wherein the gas discharge part comprises: a gas transmitting film having air permeability, by which the gas inside the accommodation part is discharged to the outside; and a moisture absorbing material that absorbs the passing through the gas transmitting film to block the inflow of the moisture from the outside to the inside of the pouch.

Abstract: A pouch film laminate for preparing a pouch type battery case accommodating an electrode assembly is provided. The pouch film laminate includes a sealant layer formed of a first polymer as an innermost layer, a surface protection layer formed of a second polymer as an outermost layer, an aluminum alloy thin film having a grain size of 10 ?m to 13 ?m, and a gas barrier layer laminated between the surface protection layer and the sealant layer, wherein the gas barrier layer has a thickness of 50 ?m to 70 ?m, and the sealant layer has a thickness of 70 ?m to 100 ?m.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion accommodating an electrode assembly, and a sealing portion formed by sealing an outer periphery of the battery case; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion; and a lead film adjacent to the sealing portion in at least one of an first portion and a second portion of the electrode lead, wherein a surface-deformed portion is formed on an outer surface of the electrode lead, and the surface-deformed portion is located between the lead film and the electrode lead.

Abstract: A battery cell includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof; an electrode lead electrically connected to an electrode tab of the electrode assembly and protruding out of the battery case; and a lead film located at a portion corresponding to the sealing portion in one of an upper portion and a lower portion of the electrode lead. The lead film has a dented portion recessed in an inner direction of the battery case. The dented portion is opened toward outside of the battery case. The sealing portion located on a gas inlet portion of the dented portion has a recessed sealing portion recessed outward from an inner side of the battery case, and the recessed sealing portion does not overlap with a part of the gas inlet portion on a plane.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion; and a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead, wherein the lead film has a dented portion formed at an inside thereof, and the dented portion extends via the sealing portion and is closed inside the lead film.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is positioned, and a sealing portion formed by sealing an outer periphery of the battery case, an electrode lead electrically connected to an electrode tab included in the electrode assembly, the electrode lead protruding out of the battery case through the sealing portion, a lead film located on at least one of a first portion and a second portion of the electrode lead, the lead film adjacent to the sealing portion, and a getter unit positioned between the electrode lead and the sealing portion. The getter unit includes a first end positioned outside of the battery case and a second end positioned inside of the battery case. The first end is covered by the lead film and not covered by the sealing portion.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion; and a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead, wherein a non-adhesion portion is formed on an outer surface of the lead film, and the non-adhesion portion is configured to face an outer surface of the electrode lead.

Abstract: Discussed is a battery valve configured to discharge a gas inside a battery to the outside, the battery valve including a communicator configured to receive a battery valve opening/closing command from an external device; and an opening/closing controller configured to open or close a passage through which the inside of the battery and the outside of the battery communicate with each other according to the battery valve opening/closing command.

Abstract: The present invention relates to a pouch type battery case which includes a pouch film laminate including a sealant layer, a gas barrier layer, and a surface protection layer, wherein the sealant layer is formed of a first polymer as an innermost layer, the surface protection layer is formed of a second polymer as an outermost layer, and the gas barrier layer is laminated between the surface protection layer and the sealant layer and is formed of an aluminum alloy thin film having a thickness of 60 ?m to 100 ?m and a grain size of 10 ?m to 13 ?m.

Abstract: An electrode lead for achieving the above object is provided. The electrode lead includes a first electrode lead having one end connected to an electrode tab protruding from one side of an electrode assembly, a second electrode lead having one end connected to the other end of the first electrode lead and the other end protruding to the outside of a battery case accommodating the electrode assembly, and a connection part configured to connect the first electrode lead to the second electrode lead, wherein the connection part is formed by a cured adhesive applied between the first electrode lead and the second electrode lead. The adhesive is formed by a mixture of a conductor and a solvent. The solvent is formed by a mixture of a polymer and a diluent. The solvent contains 5 wt % to 15 wt % of the diluent.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which a battery assembly is positioned, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the battery assembly, the electrode lead protruding out of the battery case through the sealing portion; and a lead film positioned adjacent to the sealing portion on at least one of a first side and a second side of the electrode lead, wherein the lead film includes a gas discharge portion formed to extend from an inside of the battery case to an outside of the battery case, and the gas discharge portion is opened on a side disposed inside of the battery case.

Abstract: Disclosed herein is a pouch-shaped battery case configured to receive an electrode assembly having a separator interposed between positive and negative electrodes, together with an electrolytic solution, the pouch-shaped battery case including an outer coating layer defining an outer surface of the battery case and configured to protect the electrode assembly from an outside of the battery case, the outer coating layer made of a polymer resin, a metal barrier layer located between the outer coating layer and an inner surface of the battery case, the metal barrier layer having high moisture-blocking efficiency and high thermal conductivity, and an inner sealant layer located between the metal barrier layer and an inner surface of the battery case, the inner sealant layer made of a polymer resin that has high thermal fusibility, the metal barrier layer includes a first metal that has high formability and a second metal that has high rigidity.

Abstract: To solve the above problem, a method for manufacturing an electrode lead according to an embodiment of the present invention includes: a step of manufacturing each of a first electrode lead and a second electrode lead by cutting a metal plate; a step of applying an adhesive to at least one of one end of the first electrode lead or the other end of the second electrode lead; a step of forming a lead stack by bonding the one end of the first electrode lead and the other end of the second electrode lead to each other; a step of placing the lead stack on a die; and a step of applying heat and pressure to a connection portion of the lead stack, in which the first electrode lead and the second electrode lead are connected to each other, by using a pressing device.

Abstract: Disclosed herein is a method for manufacturing an electrode lead. The method may include manufacturing each of a first electrode lead and a second electrode lead, bonding the first electrode lead to the second electrode lead form a connection part. Manufacturing the first electrode lead may include unwinding a first metal plate from a first metal reel, attaching a first tape to perform masking on a first connection area to form the connection part, plating and surface treating on the first metal plate, and removing the first tape. Manufacturing the second electrode lead may include unwinding a second metal plate from a second metal reel, attaching a second tape to perform masking on a second connection area to form the connection part, plating and surface treating the second metal plate, and removing the second tape.

Abstract: The secondary battery includes an electrode assembly to which an electrode lead is attached; a case configured to receive the electrode assembly therein; a lead film configured to surround a part of an outer surface of the electrode lead and interposed between the electrode lead and the case; a vent region formed in at least a part of the case; and a vent member inserted into the vent region and configured to contain linear low-density polyethylene having a comonomer with a carbon number of 6 or more.

Abstract: Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly, a case including an accommodation portion to receive the electrode assembly, an electrode lead attached to the electrode assembly and a vent member. The case may include a sealing portion to seal the electrode assembly therein. The sealing portion may include a sealant resin to form a seal around the electrode assembly. The electrode lead may extend away from the case along a first direction. The sealing portion may include an inclined sealing portion adjacent the electrode lead. The inclined sealing portion may extend along a second direction. The second direction may be non-orthogonal to the first direction. The vent member may be disposed in the inclined sealing portion. The vent member may include a vent resin having a lower melting point than the sealant resin.

Abstract: The secondary battery includes an electrode assembly to which an electrode lead is attached; a case configured to receive the electrode assembly therein; a lead film configured to surround a part of an outer surface of the electrode lead and interposed between the electrode lead and the case; a vent region formed in at least a part of the case; and a vent member inserted into the vent region and configured to contain linear low-density polyethylene having a poly dispersity index (PDI) of 4 or less, wherein the vent member has a maximum sealing strength of less than 6 kgf/15 mm at 100° C. or above and a maximum sealing strength of 6 kgf/15 mm or more at room temperature to 60° C.