A secondary battery includes: an electrode assembly; a case including a bottom part, a pair of side parts integrally formed with the bottom part and bent so as to extend from the bottom part, and a cover part coupled to the pair of side parts to face the bottom part and including a vent, the case accommodating the electrode assembly; and a pair of cap assemblies coupled to open ends of the case to seal the case.

A secondary battery includes: an electrode assembly; a case including a bottom part, a pair of side parts integrally formed with the bottom part and bent so as to extend from the bottom part, and a cover part coupled to the pair of side parts to face the bottom part and including a vent, the case accommodating the electrode assembly; and a pair of cap assemblies coupled to open ends of the case to seal the case.

A secondary battery includes: an electrode assembly having a long side and a short side; a retainer coupled to the short side of the electrode assembly; an insulating sheet surrounding a periphery of the electrode assembly and the retainer; and a case accommodating the electrode assembly, the retainer, and the insulating sheet.

A secondary battery includes: an electrode assembly having a long side and a short side; a retainer coupled to the short side of the electrode assembly; an insulating sheet surrounding a periphery of the electrode assembly and the retainer; and a case accommodating the electrode assembly, the retainer, and the insulating sheet.

Aspects related to a system of energy absorption of an electric aircraft in a crash is disclosed. The system may include a battery pack, wherein the battery pack may include a case, wherein the case is configured to circumscribe an inner volume of the battery pack. The battery pack may include a battery storage zone. The battery pack may include at least a battery module installed within the inner volume of the case. The system may include an energy absorbing material configured to absorb energy forced to the electric aircraft.

Aspects related to a system of energy absorption of an electric aircraft in a crash is disclosed. The system may include a battery pack, wherein the battery pack may include a case, wherein the case is configured to circumscribe an inner volume of the battery pack. The battery pack may include a battery storage zone. The battery pack may include at least a battery module installed within the inner volume of the case. The system may include an energy absorbing material configured to absorb energy forced to the electric aircraft.

A housing part for an electrical device, which is an electrical storage device, a sensor housing, a battery, a microbattery, or a capacitor, the housing part including: a feedthrough, the housing part or a base body which is a part of the housing part including the feedthrough, the feedthrough having at least one opening, the at least one opening having a wall with a reduced enclosure length EL.sub.red, the at least one opening configured for receiving a conductive material or a conductor in a glass material or a glass-ceramic material, the reduced enclosure length EL.sub.red being in a range of 0.05 mm to 0.6 mm, 0.1 mm to 0.5 mm, 0.1 mm to 0.4 mm, or 0.15 mm to 0.2 mm.

A secondary battery includes an outer package member, a battery device, and a heat-resistant member. The battery device is contained inside the outer package member. The heat-resistant member has an insulating property and is disposed between the outer package member and the battery device. The outer package member includes a container member and a closing member. The container member has an opening, and contains the battery device inside. The closing member closes the opening, and is welded to the container member. The battery device has an opposed surface and a side surface. The opposed surface is opposed to the closing member. The side surface is coupled to the opposed surface. The heat-resistant member covers from the opposed surface to the side surface.

A secondary battery includes an outer package member, a battery device, and a heat-resistant member. The battery device is contained inside the outer package member. The heat-resistant member has an insulating property and is disposed between the outer package member and the battery device. The outer package member includes a container member and a closing member. The container member has an opening, and contains the battery device inside. The closing member closes the opening, and is welded to the container member. The battery device has an opposed surface and a side surface. The opposed surface is opposed to the closing member. The side surface is coupled to the opposed surface. The heat-resistant member covers from the opposed surface to the side surface.

A button-type secondary battery includes an electrode assembly in which electrodes and a separator are layered and wound, electrode tabs having different polarities protrude from top and bottom surfaces of the electrode assembly, respectively; a can including a bottom part with the electrode assembly disposed thereon and connected to one electrode tab, and a sidewall vertically extending along a circumference of the bottom part around the electrode assembly; and a top cap assembly with a terminal part connected to the other electrode tab and a plate coupled to be insulated from the terminal part and having an edge coupled to an upper end of the sidewall such that the top cap assembly is coupled to the can to close the can. An end of an edge of the plate is welded to be coupled after being seated on a point that meets the upper end of the sidewall.