The present invention relates to a secondary battery enabling the enhancement of safety by rapidly releasing gas generated therein. One embodiment discloses a secondary battery comprising: an electrode assembly; a case for receiving the electrode assembly; and a cap assembly coupled to the upper portion of the case and provided with a cap-up, a safety vent installed on the lower portion of the cap-up and having a notch formed therein, and a cap-down coupled to the lower portion of the safety vent, wherein the cap-down comprises a welded part welded to the safety vent from the lower portion of the cap-down.

The present disclosure relates to the technical field of battery system, and discloses a battery, a battery enclosure and a vehicle, wherein the battery comprises a battery enclosure defining a receiving space; a thermal isolation panel disposed in the receiving space and dividing the receiving space into a plurality of subspaces; and a plurality of cells respectively arranged in the subspaces and divided into a plurality of groups by the thermal isolation panel; wherein a weakened zone for guiding energy release when thermal runaway occurs in the cells is formed on an enclosure wall of the battery enclosure adjacent to the cell. The cells of the battery are separated by the thermal isolation panel so as to prevent the thermal runaway events from rapid spreading in the battery. At the same time, by providing a weakened zone on the battery enclosure wall adjoining the cell, an optimal venting direction can be provided for the cell in case of a thermal runaway, thus the battery has high safety.

The present disclosure relates to the technical field of battery system, and discloses a battery, a battery enclosure and a vehicle, wherein the battery comprises a battery enclosure defining a receiving space; a thermal isolation panel disposed in the receiving space and dividing the receiving space into a plurality of subspaces; and a plurality of cells respectively arranged in the subspaces and divided into a plurality of groups by the thermal isolation panel; wherein a weakened zone for guiding energy release when thermal runaway occurs in the cells is formed on an enclosure wall of the battery enclosure adjacent to the cell. The cells of the battery are separated by the thermal isolation panel so as to prevent the thermal runaway events from rapid spreading in the battery. At the same time, by providing a weakened zone on the battery enclosure wall adjoining the cell, an optimal venting direction can be provided for the cell in case of a thermal runaway, thus the battery has high safety.

According to one or more embodiments, a method of producing a lithium-ion cell includes constructing a cell defining a cavity housing an electrode assembly including a cathode, an anode, a separator, and an electrolyte, forming the cell to generate formation gas in the cavity, and releasing the formation gas from the cavity. The method further includes placing a solid adsorbent in the cavity adjacent the electrode assembly after the releasing, and sealing the cavity with the solid adsorbent therein such that post-formation gas is adsorbed by the solid adsorbent in the cavity.

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.

A battery outgassing filter system is provided. The system includes a battery cell, an external casing encapsulating the battery cell and including a casing vent, and an outgassing filter disposed upon the casing vent and including a filter element including a first filter element portion operable to contain a first size of particulate matter and a second filter element portion operable to contain a second size of particulate matter relatively smaller than the first size of particulate matter.

A battery outgassing filter system is provided. The system includes a battery cell, an external casing encapsulating the battery cell and including a casing vent, and an outgassing filter disposed upon the casing vent and including a filter element including a first filter element portion operable to contain a first size of particulate matter and a second filter element portion operable to contain a second size of particulate matter relatively smaller than the first size of particulate matter.

Systems and methods for controlling the emission of gases and/or flames emitted from one or more electrochemical cells are disclosed. In one exemplary embodiment, gas emitted from an electrochemical cell located within an interior of an enclosure may be flowed through a flow restriction to reduce a pressure and/or temperature of the gas and/or the gas may be flowed through a catalyst prior to exiting through an outlet of the enclosure.

Systems and methods for controlling the emission of gases and/or flames emitted from one or more electrochemical cells are disclosed. In one exemplary embodiment, gas emitted from an electrochemical cell located within an interior of an enclosure may be flowed through a flow restriction to reduce a pressure and/or temperature of the gas and/or the gas may be flowed through a catalyst prior to exiting through an outlet of the enclosure.

A battery with a fire protection device, wherein the battery includes a plurality of battery cells and a battery housing, wherein a respective battery cell is arranged in an interior space of the battery housing. The fire protection device includes a composite layer with a thermal insulation layer and with a protective layer arranged on the insulation layer, wherein the composite layer is arranged on a battery housing interior side facing the interior space of the battery housing, and the insulation layer is arranged as an intermediate layer between a surface of the battery housing interior side and the protective layer and is protected by the protective layer against a gas and/or flame stream exiting the respective battery cell in the event of damage, whereby its thermally insulating properties are maintained.