A top cover for a power battery including a top cover plate, a first post, a first fastener, a second post, a first sealing member, and an insulation plate.

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, a separator between the first and second electrodes, and first and second electrode tabs respectively coupled to the first and second electrodes; a case accommodating the electrode assembly and coupled to the first electrode tab; and a cap assembly sealing an opening in the case. The cap assembly includes: a cap plate covering the opening in the case; and a terminal plate coupled to the cap plate. The terminal plate includes: a flange portion coupled to and electrically insulated from the cap plate; and a tab connecting portion protruding from the flange portion toward the electrode assembly and extending through a terminal opening in the cap plate to be coupled to the second electrode tab. The terminal plate has a flat outer surface, and the tab connecting portion has a flat inner surface.

A battery top cover assembly structure includes a top cover sheet and an electrode column arranged thereon. The top cover sheet is provided with a mounting hole for mounting the electrode column. An insulating part and a plastic part are sleevedly arranged on the electrode column in sequence. The plastic part is embedded in a bottom of the mounting hole. A bottom of the electrode column is fixedly provided on a bottom surface of the plastic part.

A non-aqueous electrolyte secondary battery includes: an electrode assembly; a rectangular outer casing; a sealing plate; an electrode terminal on the sealing plate; a first current collector connected to the electrode terminal; a second current collector connected to the first current collector; and a tab group connected to the second current collector. The second current collector is a flat plate, and includes a fuse portion having a slit extending in a lateral direction of the flat plate. The tab group is connected to the second current collector at a position closer to one side in the lateral direction, and is bent at a connection portion with the second current collector such that the bent tab group extends parallel to the side wall. The fuse portion includes a portion with a large sectional area on the other side of the slit in the lateral direction.

A non-aqueous electrolyte secondary battery includes: an electrode assembly; a rectangular outer casing; a sealing plate; an electrode terminal on the sealing plate; a first current collector connected to the electrode terminal; a second current collector connected to the first current collector; and a tab group connected to the second current collector. The second current collector is a flat plate, and includes a fuse portion having a slit extending in a lateral direction of the flat plate. The tab group is connected to the second current collector at a position closer to one side in the lateral direction, and is bent at a connection portion with the second current collector such that the bent tab group extends parallel to the side wall. The fuse portion includes a portion with a large sectional area on the other side of the slit in the lateral direction.

The aim of the invention is to provide an electrochemical cell that can be produced as simply as possible and has a long service life. This is achieved in that the electrochemical cell comprises a first contact element that connects a first cell terminal to a first connection conductor and that is fixed to a cover element of the electrochemical cell by means of a first potting element in a first connection region, said first potting element being made of a first polymer material that comprises or is made of a first resin material, and/or the electrochemical cell comprises a second contact element that connects a second cell terminal to a second connection conductor and that is fixed to the cover element by means of a second potting element in a second connection region, said second potting element being made of a second polymer material that comprises or is made of a second resin material.

A rechargeable battery according to an embodiment of the present invention includes: an electrode assembly in which a separator is disposed between a first electrode and a second electrode; a case having an opening on one side and accommodating the electrode assembly; and a cap assembly coupled to the opening so as to seal the case. The cap assembly includes: a cap plate coupled to the opening and provided with a terminal hole; a terminal plate disposed inside the terminal hole; and an insulating material, and also includes a sealing portion which covers a circumferential portion on the terminal hole side of the cap plate and a circumferential portion of the terminal plate so as to form a seal between the cap plate and the terminal plate.

A rechargeable battery according to an embodiment of the present invention includes: an electrode assembly in which a separator is disposed between a first electrode and a second electrode; a case having an opening on one side and accommodating the electrode assembly; and a cap assembly coupled to the opening so as to seal the case. The cap assembly includes: a cap plate coupled to the opening and provided with a terminal hole; a terminal plate disposed inside the terminal hole; and an insulating material, and also includes a sealing portion which covers a circumferential portion on the terminal hole side of the cap plate and a circumferential portion of the terminal plate so as to form a seal between the cap plate and the terminal plate.

Provided is a secondary battery in which an electrode body having a positive electrode tab group on one end thereof is accommodated in a battery case, wherein: a first positive electrode current collector comprises a first region disposed between a sealing plate and the electrode body, and a second region disposed between the electrode body and a first side wall of a rectangular exterior body constituting the battery case; the positive electrode tab group is connected in a folded state to a second positive electrode current collector; and the second positive electrode current collector is welded to the second region.

Provided is a secondary battery in which an electrode body having a positive electrode tab group on one end thereof is accommodated in a battery case, wherein: a first positive electrode current collector comprises a first region disposed between a sealing plate and the electrode body, and a second region disposed between the electrode body and a first side wall of a rectangular exterior body constituting the battery case; the positive electrode tab group is connected in a folded state to a second positive electrode current collector; and the second positive electrode current collector is welded to the second region.