A pre-cut glass body is employed as a separator between an anode current collector and a cathode current collector of a micro-battery. The use of a pre-cut glass body in micro-battery applications provides excellent insulation for the micro-battery and can also result in enhanced battery reliability and lifetime.

The present invention relates to a secondary battery in which an insulation sheet is inserted between a cap-up and a case, thereby increasing safety. Disclosed according to an embodiment is a secondary battery comprising: an electrode assembly; a case for receiving the electrode assembly; a cap assembly coupled to an upper part of the case; and a gasket interposed between the cap assembly and the case, wherein the cap assembly comprises: a cap-up; a safety vent installed at a lower part of the cap-up and extending to an upper part of the cap-up so as to surround a periphery of the cap-up; and an insulation sheet positioned at an upper part of the safety vent extending to the upper part of the cap-up.

A secondary battery having weldability between a current collector plate and an electrode uncoated portion by increasing an absorption rate of a laser beam irradiated onto the current collector plate. The secondary battery includes an electrode assembly including a first electrode plate having a first electrode-uncoated portion protruding to one side, a second electrode plate having a second electrode-uncoated portion protruding to an opposite side, and a separator between the first and second electrode plates; a case accommodating the electrode assembly and having a bottom surface and long and short side surfaces extending upward from the bottom surface; and a first current collector plate having a flat portion, parallel to a short side surface, that is laser-welded to the first electrode-uncoated portion, and a protrusion portion protruding from the flat portion toward the short side surface. A surface treatment part is on the flat portion.

A cylindrical secondary battery including: a cylindrical can having an open end in a longitudinal direction thereof; a cap plate coupled to the can and having an opening therein; an electrode assembly accommodated in the can and including a first electrode plate and a second electrode plate; and a first terminal. The first terminal includes: a base block electrically connected to the first electrode plate; a head facing the base block and exposed to the outside through the opening; and a fusible link connecting the base block and the head to each other and having a diameter less than that of the head.

A cylindrical secondary battery includes: a cylindrical can; a cap plate coupled to the can, the cap plate having a convex area, a concave area, and an opening; an electrode assembly accommodated in the can and including a first electrode plate and a second electrode plate; and a first terminal exposed to the outside of the cap plate through the opening and having a convex area and a concave area. The convex areas and the concave areas of the cap plate and the first terminal are alternately arranged.

A rechargeable battery according to an exemplary embodiment of the present invention includes: an electrode assembly that includes a first electrode, a second electrode, and a separator that is disposed between the first electrode and the second electrode; a case that receives the electrode assembly and includes an opening; a cap plate that is coupled to the opening and includes a cutout; and a first current collecting member that is integrally formed with the cap plate and thus is bent toward the inside of the case from the cap plate, and is electrically connected with the first electrode.

Provided herein are battery cells for battery packs in electric vehicles. A battery cell can include a housing. The housing can have a body region, a neck region, and a head region. The body region can include an electrolyte, anode, and cathode. The battery cell can include a sealing element disposed in the head region. The battery cell can include two conductive layers and an insulation layer disposed within the sealing element. The first conductive layer can include a positive terminal to couple with a first wire connected to the cathode. The first conductive layer can define a first opening to pass a second wire. The second conductive layer can include a negative terminal to couple with the second wire connected to the anode. The second conductive layer can define a second opening to pass the first wire. The insulation layer can be disposed between the two conductive layers.

An electrochemical apparatus includes an electrode assembly, a housing assembly, a conductor, and an insulator, where the electrode assembly includes a first tab, the housing assembly includes a first housing with a first through-hole and a second housing, the first housing and the second housing define an accommodating space which accommodate the electrode assembly, the first tab is electrically connected to the conductor, the insulator is located between the first housing and the conductor, the insulator has a second through-hole, in a first direction, a projection of the conductor at least partially falls inside the first through-hole and the second through-hole, the insulator includes a first insulation layer and a second insulation layer, and the first insulation layer is attached to the first housing and located between the first housing and the second insulation layer.

The disclosure provides a battery top cover assembly, comprising top cover plate and a conductive terminal structure. Connectors are formed on a bottom surface of the conductive terminal structure, and the connectors are fitted in a connecting hole of the top cover plate. Outer peripheral walls of the connectors are in contact with and welded with inner peripheral walls of the connectors, so that the conductive terminal structure is fixedly connected to the top cover plate. The independently manufactured and molded terminal structure is welded with the connecting hole of the top cover plate for fixing, which simplifies design and manufacturing process, thereby improving production efficiency and reducing production cost.

A secondary battery includes a rolled electrode body, a case main body that has a shape of an open cylinder with a bottom; a case cover, a first electrode terminal, and a second electrode terminal. The first electrode terminal and the second electrode terminal support the rolled electrode body. The first electrode terminal is fixed to the case cover, with one end being exposed to the outside of the case main body, and the other end being connected to a first collector portion. The second electrode terminal is fixed, together with the negative-electrode electrode terminal, to the case cover, with one end being exposed to the outside of the case main body, and the other end being connected to a second collector portion.