A secondary battery with an exterior body having a novel scaling structure, and a structure of a sealing portion that relaxes a stress of deformation are provided. The secondary battery includes a positive electrode, a negative electrode, an electrolyte solution, and an exterior body enclosing at least part of the positive electrode, at least part of the negative electrode, and the electrolyte solution. The exterior body includes a first region having a shape with a curve, a shape with a wavy line, a shape with an arc, or a shape with a plurality of inflection points, and a second region having the same shape as the first region. The first region is in contact with the second region. Alternatively, the first region has a shape without a straight line. The secondary battery may be flexible, and the exterior body in a region having flexibility may include the first region.

Provided are a top cover assembly of a cell, a cell, and a power battery. The top cover assembly includes an insulation cover plate, a metallic support plate, a terminal assembly, and an elastic seal. The metallic support plate and the insulation cover plate are stacked in a thickness direction. The terminal assembly passes through the insulation cover plate and the metallic support plate in the thickness direction to connect the insulation cover plate and the metallic support plate. The elastic seal surrounds a peripheral outside of the metallic support plate and the insulation cover plate. The elastic seal has a positioning flange provided on an inner peripheral surface thereof and is configured to be in a sealing fit with a housing of the cell. The positioning flange is sandwiched between the metallic support plate and the insulation cover plate.

Provided are a top cover assembly of a cell, a cell, and a power battery. The top cover assembly includes an insulation cover plate, a metallic support plate, a terminal assembly, and an elastic seal. The metallic support plate and the insulation cover plate are stacked in a thickness direction. The terminal assembly passes through the insulation cover plate and the metallic support plate in the thickness direction to connect the insulation cover plate and the metallic support plate. The elastic seal surrounds a peripheral outside of the metallic support plate and the insulation cover plate. The elastic seal has a positioning flange provided on an inner peripheral surface thereof and is configured to be in a sealing fit with a housing of the cell. The positioning flange is sandwiched between the metallic support plate and the insulation cover plate.

The present disclosure discloses a cylindrical or button battery. The battery includes a cap, a shell and a ring seal, wherein the cap and the shell are both of a tubular structure having a cover portion and are fitted together to form a hermetic space for accommodating a battery cell; the ring seal is located between a side wall of the cap and a side wall of the shell and is capable of shrinking or being torn when reaching a set temperature so as to form a slit between the side wall of the cap and the side wall of the shell to release pressure. The ring seal of the battery can shrink or be torn at the set temperature to release pressure, and therefore the battery is characterized by excellent safety.

A secondary battery includes: a cylindrical case; an electrode assembly accommodated in the cylindrical case and wound in a cylindrical shape; and a current interrupt device electrically connected to the electrode assembly and sealing the cylindrical case. The current interrupt device includes a cap-down electrically connected to the electrode assembly, a safety vent electrically connected to the cap-down, and an insulating gasket between the cap-down and the safety vent and covering outer circumferences of the cap-down and the safety vent.

A secondary battery with an exterior body having a novel sealing structure, and a structure of a sealing portion that relaxes a stress of deformation are provided. The secondary battery includes a positive electrode, a negative electrode, an electrolyte solution, and an exterior body enclosing at least part of the positive electrode, at least part of the negative electrode, and the electrolyte solution. The exterior body includes a first region having a shape with a curve, a shape with a wavy line, a shape with an arc, or a shape with a plurality of inflection points, and a second region having the same shape as the first region. The first region is in contact with the second region. Alternatively, the first region has a shape without a straight line. The secondary battery may be flexible, and the exterior body in a region having flexibility may include the first region.

A sealed secondary battery cell that is chargeable between a charged state and a discharged state is provided. The sealed secondary battery cell comprises a hermetically sealed enclosure comprising a polymer enclosure material, an electrode assembly enclosed by the hermetically sealed enclosure, a set of electrode constraints, and a rated capacity of at least 100 mAmp.Math.hr. A thermal conductivity of the secondary battery cell along a thermally conductive path between the vertically opposing regions of the external vertical surfaces of hermetically sealed enclosure in the vertical direction is at least 2 Wm.Math.K.

A sealed secondary battery cell that is chargeable between a charged state and a discharged state is provided. The sealed secondary battery cell comprises a hermetically sealed enclosure comprising a polymer enclosure material, an electrode assembly enclosed by the hermetically sealed enclosure, a set of electrode constraints, and a rated capacity of at least 100 mAmp.Math.hr. A thermal conductivity of the secondary battery cell along a thermally conductive path between the vertically opposing regions of the external vertical surfaces of hermetically sealed enclosure in the vertical direction is at least 2 Wm.Math.K.

An adhesive film for a metal terminal being interposed between a metal terminal electrically connected to an electrode of a power storage device element, and a power storage device external member that seals the power storage device element. The adhesive film is configured from a laminate provided with: a first polyolefin layer disposed on the metal terminal side; a base material; and a second polyolefin layer disposed on the power storage device external member side. Under the following measurement conditions, the restoration rate measured when an indenter is pressed in a vertical direction with respect to a cross section in a thickness direction of the first polyolefin layer is 46.0% or greater. Restoration rate measurement conditions are a load of 10 mN, a load application speed of 1 mN/10 seconds, retention time of 10 seconds, a load releasing speed of 1 mN/10 seconds, and measurement temperature of 25° C.

A secondary battery includes: an electrode assembly including a negative electrode plate, a positive electrode plate, and a separator between the negative electrode plate and the positive electrode plate; and a case accommodating the electrode assembly. The electrode assembly includes an adhesive part on an outermost region of the electrode assembly. The adhesive part is arranged to cover a boundary line between the negative electrode plate and the separator or between the positive electrode plate and the separator, and is bonded to the case.