The present invention relates to a secondary battery, which has a simplified cap assembly structure to ensure an inner space, and thus can have increased capacity. Disclosed in one embodiment is a secondary battery comprising: an electrode assembly; a case for accommodating the electrode assembly; and a cap assembly coupled to the top of the case and electrically connected to the electrode assembly, wherein the cap assembly comprises: a cap plate having a ring-shaped first groove formed on the upper surface thereof, and a ring-shaped second groove formed on the lower surface thereof and connected to the first groove; and an insulation member insert-injected into the first groove.

The present invention relates to a secondary battery, which has a simplified cap assembly structure to ensure an inner space, and thus can have increased capacity. Disclosed in one embodiment is a secondary battery comprising: an electrode assembly; a case for accommodating the electrode assembly; and a cap assembly coupled to the top of the case and electrically connected to the electrode assembly, wherein the cap assembly comprises: a cap plate having a ring-shaped first groove formed on the upper surface thereof, and a ring-shaped second groove formed on the lower surface thereof and connected to the first groove; and an insulation member insert-injected into the first groove.

The disclosure relates to a battery pack with a function of discharging venting gas and a control system for the same, in which air for cooling is allowed to flow during a normal state, and venting gas generated in a battery cell during thermal runaway is discharged outward from a vehicle but prevented from flowing back to a vehicle interior.

The battery pack with a function of discharging venting gas includes an outlet duct including a channel selectively set to discharge air that returns from cooling a battery cell to an interior of a vehicle, or discharge venting gas that is generated due to thermal runaway of the battery cell to an outside of the vehicle; a switching wall provided inside the outlet duct, and setting a channel inside the outlet duct; and an actuator actuating the switching wall to discharge the venting gas to the outside of the vehicle when the thermal runaway occurs in the battery cell.

Discussed is a battery cell assembly that may include a plurality of battery cells, a bus bar assembly on the battery cell assembly and electrically connected to the plurality of battery cells, a cooling unit spaced apart by a certain distance from the bus bar assembly and configured to cool the battery cell assembly, and a potting resin on at least one of an upper side and a lower side of the battery cell assembly.

Discussed is a battery cell assembly that may include a plurality of battery cells, a bus bar assembly on the battery cell assembly and electrically connected to the plurality of battery cells, a cooling unit spaced apart by a certain distance from the bus bar assembly and configured to cool the battery cell assembly, and a potting resin on at least one of an upper side and a lower side of the battery cell assembly.

A battery venting system having a battery module containing a plurality of pouch cells. The battery module also includes a vent port. The battery venting system also including a vent outlet disposed on the surface of an aircraft fuselage. The battery venting system further including a vent conduit fluidly connecting the vent port of the battery module to the vent outlet. The vent conduit is configured to carry battery ejecta from the battery module, from the vent port to the vent outlet. The vent conduit includes at least a cooling fin disposed on an interior wall of the vent conduit and extending into the vent conduit, the at least a cooling fin configured to dissipate heat from the battery ejecta, when the battery ejecta is in the vent conduit.

A battery venting system having a battery module containing a plurality of pouch cells. The battery module also includes a vent port. The battery venting system also including a vent outlet disposed on the surface of an aircraft fuselage. The battery venting system further including a vent conduit fluidly connecting the vent port of the battery module to the vent outlet. The vent conduit is configured to carry battery ejecta from the battery module, from the vent port to the vent outlet. The vent conduit includes at least a cooling fin disposed on an interior wall of the vent conduit and extending into the vent conduit, the at least a cooling fin configured to dissipate heat from the battery ejecta, when the battery ejecta is in the vent conduit.

Proposed is a secondary battery assembly. A secondary battery assembly according to an embodiment includes a secondary battery having, at an end or each end thereof, an electrode tab including a tab sealing part, and a side sealing part bent on a side surface thereof to a predetermined length, and a venting delay device including a protrusion formed to be spaced apart and face the bent side sealing part. According to the embodiment, it is possible to effectively prevent and delay breakage of a fusion portion of a sealing part of a secondary battery from occurring due to pressure caused by discharge of gas generated inside the secondary battery.

Disclosed is a battery cell, a battery module, a battery pack, and a vehicle. The battery cell may include a venting guide unit to discharge a venting gas in a desired direction and from a desired location of a cell case of the battery when a thermal event occurs. The battery cell may include an electrode assembly and an electrode lead connected to the electrode assembly. The cell case may be configured to accommodate the electrode assembly therein and support the electrode lead. The venting guide unit provided to the cell case may be configured to guide a venting gas to be discharged to a predetermined region of the cell case as an internal pressure of the cell case increases.

A battery pack (e.g., a battery pack for marine environments) can include a lower enclosure having an upper wall and defining a cavity, a plurality of battery cells positioned within the cavity, a radiator assembly positioned above the upper wall of the lower enclosure, a vent in the upper wall of the cavity, and/or a valve configured to selectively facilitate fluid communication between the cavity and the radiator assembly via the vent. In some embodiments, the valve is configured to open in response to increased pressure in the cavity resulting from a thermal runaway event. In some embodiments, the radiator is configured to create a tortuous path and collect flammable particulates from the thermal runaway event.