Abstract: An embodiment fuel cell including a high temperature polymer electrolyte membrane includes an electrolyte membrane including a phosphoric acid-doped polymer of intrinsic microporosity, a cathode disposed on a first surface of the electrolyte membrane, and an anode disposed on a second surface of the electrolyte membrane, the second surface opposite the first surface.

Abstract: A battery cell includes an electrode assembly formed by stacking a first separator, a negative electrode plate, a second separator, and a positive electrode plate; a negative electrode tab protruding from the negative electrode plate; and a positive electrode tab protruding from the positive electrode plate, the first and second separators have larger size in all four surfaces than the negative and positive electrode plates, and the whole of the tab edge portions of the first and second separators located on the surface on which the positive electrode tab and the negative electrode tab are formed and a part of the both side edge portions connected to the tab edge portion are adhered to each other, the inward adhesion width at the tab edge portion is smaller than the inward adhesion width at both ends where the tab edge portion and the both side edges portions are connected.

Abstract: Disclosed are a secondary battery and a secondary battery case. According to one aspect of the present invention, provided is a case for a secondary battery including: a first recess part having a recessed shape; a second recess part opposite the first recess part and having a recessed shape; a circumferential part configured to surround a circumference of each of the first recess part and the second recess part when the case is unfolded; and a connection part provided between the first recess part and the second recess part to connect the first recess part to the second recess part, wherein, when the case is unfolded, the connection part includes: a first connection surface inclined in a first direction from one end of the first recess part; and a second connection surface inclined in the first direction from one end of the second recess part.

Abstract: A case for a secondary battery, in which an electrode assembly having a structure, in which electrodes and separators are alternately disposed, is accommodated, includes: a first recess part and a second recess part, each of which has a recessed shape; a circumferential part configured to surround a circumference of each of the first recess part and the second recess part when the case is unfolded; and a connection part provided between the first recess part and the second recess part to connect the first recess part to the second recess part, wherein, when the case is unfolded, the connection part has a shape that is recessed from each of the first recess part and the second recess part in one direction.