Abstract: A secondary battery according to an embodiment of the present disclosure includes an electrode assembly to which an electrode lead is attached; a case accommodating the electrode assembly so that a portion of the electrode lead is exposed to the outside; a sealing portion formed in the case to seal the electrode assembly; and a lead film covering a portion of an outer surface of the electrode lead and interposed between the electrode lead and the sealing portion, wherein the electrode lead includes a first region not corresponding to the lead film and exposed to the outside of the case, a second region corresponding to the lead film, and a third region not corresponding to the lead film and not exposed to the outside of the case, wherein a separation groove may be located in the third region.

Abstract: The present disclosure relates to a secondary battery including an electrode assembly to which an electrode lead is attached; a case accommodating the electrode assembly and defining a sealing portion to seal the electrode assembly in the case; and a lead film surrounding a portion of an outer surface of the electrode lead and interposed between the electrode lead and the sealing portion. The lead film includes a first region configured to be primarily broken during swelling of the battery and a second region configured to be secondarily broken during swelling of the battery.

Abstract: A pouch film laminate according to the present disclosure may include a base material layer, a gas barrier layer, and a sealant layer. The gas barrier layer may be disposed between the base material layer and the sealant layer. The gas barrier layer may include stainless steel. The pouch film laminate may have a tensile rupture strength of about 130% to about 250% of a tensile rupture strength of the gas barrier layer.

Abstract: The present invention relates to a method and an apparatus for diagnosing low voltage of a secondary battery cell. The method for diagnosing low voltage of a secondary battery cell according to an embodiment of the present invention includes pre-aging a battery cell, charging the battery cell according to a preset charging condition, measuring a parameter for determining low voltage failure of the battery cell, comparing the measured parameter with a reference parameter, and performing formation when the battery cell is determined to be normal.

Abstract: The present invention relates to a battery cell including a pouch-shaped battery case configured to receive an electrode assembly therein. The pouch-shaped battery case is provided at an outer periphery thereof surrounding an electrode assembly receiving portion with a sealed portion, and an embossed pattern is formed on the sealed portion in all directions. Thus, it is possible to increase sealing force of a pouch-shaped battery cell without the addition of a separate battery cell manufacturing process.

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 secondary battery comprises an electrode assembly, a can, and an insulator. The electrode assembly includes a first electrode, a separator, and a second electrode alternately stacked and wound. The can has an accommodation part accommodating the electrode assembly therein, and the can comprises a first can and a second can having cylindrical shapes open in a direction facing each other. The insulator insulates an overlapping portion between the first can and the second can. The first can is electrically connected to the first electrode, and the second can is electrically connected to the second electrode. The insulator has a short-circuit induction through-part defined by a through-hole or a cutoff line, such that a short circuit occurs between the first can and the second can through the short-circuit induction through-part when it is deformed in shape as heat or a pressure is applied to contract or expand the insulator.

Abstract: The present invention relates to a pouch-shaped battery cell with improved safety, and more particularly to a pouch-shaped battery cell including an electrode assembly, a cell case constituted by an upper case and a lower case configured to define a space portion configured to receive the electrode assembly, and a rupture induction portion. The electrode assembly including a negative electrode, a separator, and a positive electrode. Whereby the rapture induction portion is configured to induce rupture of the cell case when the pressure in the cell case increases is provided in the space portion of the cell case.

Abstract: The present disclosure relates to a lead film for a secondary battery including a fire extinguishing agent in which the sealing property of a battery may be maintained and safety may be improved, and a secondary battery including the lead film. A lead film for a secondary battery according to the present disclosure includes a fire extinguishing agent. According to the present disclosure, because the first extinguishing agent is included in a lead film adjacent to an electrode lead with a large amount of heat, the fire extinguishing agent may quickly operate when a temperature of a battery rises.

Abstract: The present invention relates to a pouch-shaped battery cell including an electrode assembly having an electrode lead joined thereto, a pouch case configured to receive the electrode assembly, the pouch case having a sealed portion for sealing formed at an outside thereof, and a lead film interposed between the electrode lead and an inner surface of the pouch case at the sealed portion, wherein the pouch-shaped battery cell includes a safety element interposed between the electrode lead and the lead film, the safety element being configured to absorb energy in the battery cell, thereby discharging the battery cell, when the battery cell is overheated to a predetermined temperature or higher.

Abstract: A secondary battery according to the present invention comprises: an electrode assembly in which a first electrode, a separator, and a second electrode are alternately stacked and wound together; a can provided with an accommodation part that accommodates the electrode assembly therein, the can comprising a first can and a second can, which have cylindrical shapes opened in a direction facing each other; and an insulator configured to insulate an overlapping portion between the first can and the second can. The first can forms a first electrode terminal that directly contacts an end of the first electrode, and the second can forms a second electrode terminal that directly contacts an end of the second electrode.

Abstract: An energy storage device includes: a battery rack fixedly installed in a building or a container and having a partitioned space; and a plurality of battery modules installed in the partitioned space of the battery rack, wherein each of the plurality of battery modules is inserted into the battery rack in a sliding manner, wherein a front surface of each of the plurality of battery modules is fixed to the battery rack with a bolt, and wherein a rear surface of each of the plurality of battery modules is fixed to the battery rack with a hook.

Abstract: The present invention relates to a method and an apparatus for diagnosing low voltage of a secondary battery cell. The method for diagnosing low voltage of a secondary battery cell according to an embodiment of the present invention includes pre-aging a battery cell, charging the battery cell according to a preset charging condition, measuring a parameter for determining low voltage failure of the battery cell, comparing the measured parameter with a reference parameter, and performing formation when the battery cell is determined to be normal.

Abstract: A battery pack including at least one battery cell; a pack case configured to accommodate the battery cell and having a cooling hole formed therethrough; a flow meter provided at an outer side of the pack case and disposed adjacent to the cooling hole; and an opening and closing unit configured to open or close the cooling hole according to a temperature change inside the pack case.

Abstract: A secondary battery according to the present invention comprises: an electrode assembly in which a first electrode, a separator, and a second electrode are alternately stacked and wound together; a can provided with an accommodation part that accommodates the electrode assembly therein, the can comprising a first can and a second can, which have cylindrical shapes opened in a direction facing each other; and an insulator configured to insulate an overlapping portion between the first can and the second can. The first can forms a first electrode terminal that directly contacts an end of the first electrode, and the second can forms a second electrode terminal that directly contacts an end of the second electrode.

Abstract: A secondary battery comprises an electrode assembly including a first electrode, a separator, and a second electrode alternately stacked and wound about a central axis. A first non-coating portion that is not coated with an electrode active material protrudes farther than the separator in a first direction along the central axis and a second non-coating portion that is not coated with the electrode active material protrudes farther than the separator in a second, opposite direction along the central axis. The first non-coating portion contacts a first connection part disposed on an end of a first can of the battery, and the second non-coating portion contacts a second connection part disposed on an end of a second can. At least one of the first connection part or the second connection part comprises a protrusion having a shape protruding towards the electrode assembly.

Abstract: A secondary battery comprises an electrode assembly, a can, and an insulator. The electrode assembly includes a first electrode, a separator, and a second electrode alternately stacked and wound. The can has an accommodation part accommodating the electrode assembly therein, and the can comprises a first can and a second can having cylindrical shapes open in a direction facing each other. The insulator insulates an overlapping portion between the first can and the second can. The first can is electrically connected to the first electrode, and the second can is electrically connected to the second electrode. The insulator has a short-circuit induction through-part defined by a through-hole or a cutoff line, such that a short circuit occurs between the first can and the second can through the short-circuit induction through-part when it is deformed in shape as heat or a pressure is applied to contract or expand the insulator.

Abstract: A battery module according to an embodiment of the present disclosure includes a battery cell stack in which a plurality of battery cells are stacked; a casing configured to surround the battery cell stack; and a heat transfer member to cool or heat the battery cells. The heat transfer member is disposed between any two adjacent battery cells of the battery cell stack. The heat transfer member is spaced apart from the battery cells and is configured to move into contact with the battery cells to cool or heat the battery cells.

Abstract: Provided are an electrode unit and a method for manufacturing the electrode unit. According to the present invention, after the electrode unit is manufactured by using heat, bending of the electrode unit occurring by cooling the electrode unit may be eliminated or minimized. To achieve the aforementioned object, in the method for manufacturing the electrode unit according to an embodiment of the present invention, stress applied to the inside of each of the positive electrode collector and the negative electrode collector is calculated to reflect the calculated results, thereby selecting the positive electrode collector and the negative electrode collector.