A battery pack including battery cells arranged in a vertically inverted pattern; a cell holder in which the battery cells are accommodated; and an exhaust pipe protruding from an outer side surface of the cell holder at a position vertically between an upper surface and a lower surface of the cell holder and through which exhaust gas from the battery cells is exhaustible.

A method for constructing a battery that includes a can, a jelly roll contained in the can, a top insulator contained in the can adjacent to and above the jelly roll, and a battery cap. The method includes forming the can, forming the jelly roll, inserting the jelly roll into the can, inserting a top insulator into the can adjacent to and above the jelly roll, assembling the battery cap, including an outer conductive ring, an insulator ring, a conductive top plate, a conductive rupture plate, connecting a cathode to the conductive rupture plate, inserting the battery cap into the can, and welding the battery cap to an inner surface of the can.

A pouch-type secondary battery according to an embodiment of the present invention for solving the above problems includes a cup part configured to accommodate an electrode assembly formed by stacking electrodes and separators, wherein the cup part includes: a bottom portion configured to form a bottom; an outer wall configured to form a side surface and meet the bottom portion; a punch edge configured to connect the bottom portion to the outer wall; a thickness edge configured to connect two adjacent outer walls to each other; and a corner formed by connecting the two adjacent punch edges to the thickness edge, wherein at least one of the punch edges is rounded, at least one of the thickness edge is rounded, at least one of the corner is rounded and has a curvature radius different from that of each of the punch edge and the thickness edge.

A pouch-type secondary battery according to an embodiment of the present invention for solving the above problems includes a cup part configured to accommodate an electrode assembly formed by stacking electrodes and separators, wherein the cup part includes: a bottom portion configured to form a bottom; an outer wall configured to form a side surface and meet the bottom portion; a punch edge configured to connect the bottom portion to the outer wall; a thickness edge configured to connect two adjacent outer walls to each other; and a corner formed by connecting the two adjacent punch edges to the thickness edge, wherein at least one of the punch edges is rounded, at least one of the thickness edge is rounded, at least one of the corner is rounded and has a curvature radius different from that of each of the punch edge and the thickness edge.

Energy storage devices, battery cells, and batteries of the present technology may include a housing characterized by a first end and a second end opposite the first end. The housing may include a circumferential indentation proximate the first end. The housing may define a first interior region between the first end and the circumferential indentation, and the housing may define a second interior region between the circumferential indentation and the second end. The batteries may include a set of electrodes located within the housing. The set of electrodes may be positioned within the second interior region of the housing. The batteries may include a cap at least partially contained within the first interior region of the housing. The batteries may also include a first insulator positioned within the housing. The first insulator may extend across the circumferential indentation from the cap to the set of electrodes.

Energy storage devices, battery cells, and batteries of the present technology may include a housing characterized by a first end and a second end opposite the first end. The housing may include a circumferential indentation proximate the first end. The housing may define a first interior region between the first end and the circumferential indentation, and the housing may define a second interior region between the circumferential indentation and the second end. The batteries may include a set of electrodes located within the housing. The set of electrodes may be positioned within the second interior region of the housing. The batteries may include a cap at least partially contained within the first interior region of the housing. The batteries may also include a first insulator positioned within the housing. The first insulator may extend across the circumferential indentation from the cap to the set of electrodes.

A battery includes: a cell having a first surface and a second surface opposite to each other along a first axis; and a first electrode tab on the first surface of the cell. The first electrode tab includes: a first coupling piece including a first coupling portion coupled to the first surface of the cell; and a first lead-out piece extending from the first coupling piece outside a periphery of the cell along a second axis. The first coupling portion has a convex arc shape toward the first lead-out piece.

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode; a case that is connected to the first electrode to accommodate the electrode assembly, and includes an opening exposing the electrode assembly and a first side wall forming the opening; a cap plate that is coupled to the case to cover an outer area of the opening, and includes a through-hole exposing a central area of the opening and a second side wall overlapping the first side wall in a horizontal direction; a terminal plate that is connected to the second electrode to be insulation-bonded to the cap plate and covers the through-hole; and a first bonding layer that is positioned between the first side wall of the case and the second side wall of the cap plate, and bonds the first side wall and the second side wall.

Rechargeable battery cells according to embodiments of the present technology may include a housing having a first conductive segment operable at anode potential. The housing may include a second conductive segment operable at cathode potential. The housing may include a gasket positioned between the first conductive segment and the second conductive segment and configured to hermetically seal the housing. The cells may include an electrode stack including an anode. The anode may include an anode tab electrically coupled with the first conductive segment of the housing. The electrode stack may include a cathode. The cathode may include a cathode tab electrically coupled with the second conductive segment of the housing. The cells may include a barrier material disposed between the cathode tab and the second conductive segment of the housing. The cathode tab may be electrically coupled with the second conductive segment of the housing through the barrier material.

A battery can has a cylindrical body section, an opening section at one end of the body section, and a bottom section closing the other end of the body section. An annularly grooved portion is formed by constriction near the open end of the opening section. The annularly grooved portion has an upper-groove section as the section closer to the open end than the narrowest section, which is positioned farthest inside, of the grooved portion, and also has a lower-groove section as the section closer to the bottom section than the narrowest section. The wall thickness T1 of the lower-groove section is larger than the wall thickness T2 of the body section.