A battery cell may include a housing, an electrode assembly, and a pole. The housing may be integrally formed and include two first side walls arranged opposite each other in a first direction and two second side walls arranged opposite each other in a second direction, the two first side walls and the two second side walls may enclose an accommodating cavity, the housing may have at least one opening in a third direction, and the first direction, the second direction, and the third direction are perpendicular to one another. The electrode assembly may be accommodated in the accommodating cavity, and the electrode assembly may include a body structure and a tab protruding out of the body structure.

A secondary battery includes: an electrode assembly including a first electrode tab and a second electrode tab; a first current collector plate electrically connected to the first electrode tab; a case in which the first current collector plate and the electrode assembly are accommodated; a cap plate sealing an upper end of the case and including a coupling protrusion protruding downward; and an insulating member coupled to and fixed to the coupling protrusion at a lower portion of the cap plate, and the first current collector plate is coupled to a coupling hook located under the insulating member to be fixed.

A secondary battery includes an electrode assembly including a first non-coating portion and a second non-coating portion, a first current collector and a second current collector joined to the first non-coating portion and the second non-coating portion, respectively, a case that accommodates the electrode assembly, and a cap assembly that seals the case. The first current collector includes a first overlapping portion that overlaps and joins the first non-coating portion, the first overlapping portion having a length and a width, and the first non-coating portion having a length and a width. The length of the first overlapping portion is 30% to 70% of the length of the first non-coating portion, and the width of the first overlapping portion is 50% to 70% of the width of the first non-coating portion.

The present application discloses an electric connection assembly having a support and a connector, wherein the support comprises a support body; the support body is provided with a mounting groove; the connector is configured to be in contact electrical connection with a mating connector; the connector comprises a mounting part; part or all of the mounting part is detachably received within the mounting groove; the support and the connector are formed separately and connected to each other. Compared with the prior art, the electric connection assembly of the present disclosure implements the function of supporting, holding and assembling integrally the corresponding connectors by means of the support provided with a mounting groove. Correspondingly, the entire structure of the electric connection assembly is simplified and convenient to be assembled.

The present application discloses an electric connection assembly having a support and a connector, wherein the support comprises a support body; the support body is provided with a mounting groove; the connector is configured to be in contact electrical connection with a mating connector; the connector comprises a mounting part; part or all of the mounting part is detachably received within the mounting groove; the support and the connector are formed separately and connected to each other. Compared with the prior art, the electric connection assembly of the present disclosure implements the function of supporting, holding and assembling integrally the corresponding connectors by means of the support provided with a mounting groove. Correspondingly, the entire structure of the electric connection assembly is simplified and convenient to be assembled.

An energy storage device (battery) includes an electrode assembly having current collecting tabs, each of which is formed of a plurality of projecting portions, projecting from a first straight line portion on one side in a stacking direction of electrode sheets. The electrode assembly is housed in a case (exterior body). The energy storage device further includes current collectors, which are electrically connected to the external terminals, disposed on the case. The current collectors, are connected to the current collecting tabs, arranged in a stacking direction of the electrode sheets, on a second straight line portion side where the projecting portions, are not formed.

A terminal rivet for a terminal is described, wherein the terminal rivet comprises: a first shaft portion configured to extend through a through-hole of a terminal plate of the terminal, and a first flange comprising a protruding portion extending a distance above a remaining surface portion of the first flange, the protruding portion being configured to extend into the terminal plate in a riveted state. A method for fastening the terminal rivet to the terminal is also described, including at least the steps of inserting the first shaft portion through a through-hole of the terminal plate; and deforming the flange and the terminal plate such that the flange extends into a surface of the terminal plate.

A terminal rivet for a terminal is described, wherein the terminal rivet comprises: a first shaft portion configured to extend through a through-hole of a terminal plate of the terminal, and a first flange comprising a protruding portion extending a distance above a remaining surface portion of the first flange, the protruding portion being configured to extend into the terminal plate in a riveted state. A method for fastening the terminal rivet to the terminal is also described, including at least the steps of inserting the first shaft portion through a through-hole of the terminal plate; and deforming the flange and the terminal plate such that the flange extends into a surface of the terminal plate.

The herein-disclosed sealed battery includes a battery case, a terminal member (negative electrode external terminal) including an opposed surface opposed to the battery case, and an insulating member (negative side gasket) disposed between the sealing plate and the negative electrode external terminal. Then, the surface of the battery case and/or an opposed surface of the negative electrode external terminal includes a 1st rough surface area on at least a part of a portion contacting with the negative side gasket, and an arithmetic average roughness Sa of the 1st rough surface area is equal to or more than 1 μm. By doing this, it is possible to suppress a liquid leakage of an electrolyte caused by degradation of the negative side gasket.

An energy storage device includes an electrode assembly, a case that houses the electrode assembly, and a metal external terminal disposed in the case, wherein the external terminal includes a flange portion spreading along the case outside the case and a shaft portion extending from the flange portion and penetrating the case, the flange portion is formed of a clad material including a plurality of metal layers stacked in a penetrating direction of the shaft portion, and includes a through hole through which the shaft portion is inserted.