A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case configured to be connected to the first electrode and accommodate the electrode assembly, and including an opening to expose the electrode assembly; a cap plate configured to be coupled to the case to cover an outer area of the opening, and including a through-hole to expose a central area of the opening; a terminal plate configured to cover the through-hole and to be connected to the second electrode; and a thermal-fusion layer configured to be arranged between the cap plate and the terminal plate and to insulation-bond the cap plate and the terminal plate, and the thermal-fusion layer includes a plurality of layers including a thermoplastic resin layer.

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case configured to be connected to the first electrode and accommodate the electrode assembly, and including an opening to expose the electrode assembly; a cap plate configured to be coupled to the case to cover an outer area of the opening, and including a through-hole to expose a central area of the opening; a terminal plate configured to cover the through-hole and to be connected to the second electrode; and a thermal-fusion layer configured to be arranged between the cap plate and the terminal plate and to insulation-bond the cap plate and the terminal plate, and the thermal-fusion layer includes a plurality of layers including a thermoplastic resin layer.

An adhesive film for a metal terminal is interposed between a metal terminal electrically connected to an electrode of a power storage device element, and a power storage device exterior material that seals the power storage device element, the adhesive film comprising a laminated body including, in the following order: a first polyolefin layer disposed on the metal terminal side; a base material; and a second polyolefin layer disposed on the power storage device exterior material side, wherein the adhesive film has a Martens hardness of at most 30 N/mm.sup.2 as measured in a direction perpendicular to a cross-section in the thickness direction of the first polyolefin layer.

A secondary battery includes an electrode assembly, a battery case surrounding the electrode assembly, and a sealing member located between the electrode assembly and the battery case. The sealing member includes polymer particles that are configured to expand in all directions.

A secondary battery includes an electrode assembly, a battery case surrounding the electrode assembly, and a sealing member located between the electrode assembly and the battery case. The sealing member includes polymer particles that are configured to expand in all directions.

A lithium ion battery and an electric vehicle with the same are provided. The lithium ion battery includes a cover plate assembly and a battery cell assembly, the cover plate assembly includes a pole and a polarity connecting piece, the pole is connected with the polarity connecting piece, the battery cell assembly is provided with a battery cell tab assembly, and the pole is connected and conducted with the battery cell tab assembly through the polarity connecting piece. As a hard connection, the polarity connecting piece is directly or indirectly connected with the battery cell tab assembly. The polarity connecting piece is in interference fit with the pole for laser welding, so that the connection reliability is high, the overcurrent capability is strong, and electronic conduction is easy.

The present disclosure relates to a rechargeable battery including an electrode assembly that includes a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode, a first electrode tab that is electrically connected with the first electrode, and includes at least one first bent portion, a second electrode tab that is electrically connected with the second electrode, and includes at least one second bent portion, and exterior member that receives the electrode assembly, and a reinforcement member that is disposed in the first exterior member, while being disposed adjacent to at least one of the first electrode tab and the second electrode tab.

The present invention relates to a cylindrical secondary battery configured such that a hole is provided in a bottom portion of the cylindrical secondary battery manufactured using a metal can and the hole is hermetically sealed using a flexible material, such as rubber.

The present invention relates to a cylindrical secondary battery configured such that a hole is provided in a bottom portion of the cylindrical secondary battery manufactured using a metal can and the hole is hermetically sealed using a flexible material, such as rubber.

A resin film for a terminal according to one aspect of the present disclosure is for covering the outer peripheral surface of part of a metal terminal that constitutes a power storage device, and includes a resin layer containing: a polyethylene; and a compatibilizer having a region which is compatible with the polyethylene and a region which is compatible with polypropylene.