Abstract: A negative voltage switching device includes a first switching circuit configured to transmit a first negative voltage, a second switching circuit configured to transmit a second negative voltage, and a switching selection circuit configured to select one of the first switching circuit or the second switching circuit for transmitting one of the first negative voltage and the second negative voltage to an output terminal.

Abstract: The present invention relates to a pouch-shaped battery cell including a battery case made of a laminate sheet, an electrode assembly received in the battery case, the electrode assembly having an electrode tab protruding therefrom, an electrode lead electrically connected to the electrode tab, the electrode lead extending outwards from the battery case, and a gas discharge portion located in the electrode lead, wherein it is possible to prevent the internal pressure of the pouch-shaped battery cell from being increased to a predetermined level or more.

Abstract: A flexible secondary battery includes an exterior member having an accommodation space inside, a cathode collector and an anode collector located in the accommodation space and spaced apart from each other, a cathode active material portion on the cathode collector, and an anode active material portion on the anode collector. The cathode collector includes a first connection portion extending in a first direction and a plurality of first leg portions protruding from the first connection portion in a second direction different from the first direction. The anode collector includes a second connection portion parallel to the first connection portion and a plurality of second leg portions protruding from the second connection portion toward the first connection portion. The first leg portions and the second leg portions are alternately arranged between the first connection portion and the second connection portion. The cathode active material portion is located only on the first leg portions.

Abstract: The present disclosure relates to an extremely deformable structure comprising a basic displacement unit having an embedded form, in which m polygonal basic unit cells are disposed adjacent to each other, m separation parts are formed among the m basic unit cells, a junction part connecting the basic unit cells to each other is formed between the basic unit cells in which the junction part has a junction part pattern in which an external junction part disposed at the outer portion of the basic unit cell and an internal junction part which is not in contact with the outer portion of the basic unit cell are sequentially repeated, and the relative positions of the m basic unit cells are changed according to the junction part pattern, and thus, are activated (here, m is an integer of 4 or 6). Further, the present disclosure relates to a lithium secondary battery made from the extremely deformable structure.

Abstract: A flexible secondary battery includes an exterior member having an accommodation space inside, a cathode collector and an anode collector located in the accommodation space and spaced apart from each other, a cathode active material portion on the cathode collector, and an anode active material portion on the anode collector. The cathode collector includes a first connection portion extending in a first direction and a plurality of first leg portions protruding from the first connection portion in a second direction different from the first direction. The anode collector includes a second connection portion parallel to the first connection portion and a plurality of second leg portions protruding from the second connection portion toward the first connection portion. The first leg portions and the second leg portions are alternately arranged between the first connection portion and the second connection portion. The cathode active material portion is located only on the first leg portions.

Abstract: The present disclosure relates to an extremely deformable structure comprising a basic displacement unit having an embedded form, in which m polygonal basic unit cells are disposed adjacent to each other, m separation parts are formed among the m basic unit cells, a junction part connecting the basic unit cells to each other is formed between the basic unit cells in which the junction part has a junction part pattern in which an external junction part disposed at the outer portion of the basic unit cell and an internal junction part which is not in contact with the outer portion of the basic unit cell are sequentially repeated, and the relative positions of the m basic unit cells are changed according to the junction part pattern, and thus, are activated (here, m is an integer of 4 or 6). Further, the present disclosure relates to a lithium secondary battery made from the extremely deformable structure.

Abstract: The invention relates to a base station antenna, that includes two or more reflector plates, each provided with a radiating element. The base station antenna also includes a reflector plate connecting member connected to each reflector plate for enabling the rotation of the reflector plates. The base station antenna also includes a reflector plate controller providing control signals for controlling the rotation and stoppage of the reflector plates.

Abstract: The invention relates to a base station antenna, that includes two or more reflector plates, each provided with a radiating element. The base station antenna also includes a reflector plate connecting member connected to each reflector plate for enabling the rotation of the reflector plates. The base station antenna also includes a reflector plate controller providing control signals for controlling the rotation and stoppage of the reflector plates.