Abstract: A cylindrical battery is provided and includes a columnar electrode body, a cylindrical battery can in which one end portion is opened and the electrode body is accommodated, and a current interrupt device provided at the one end portion. The current interrupt device includes a cover, a holder provided inside the cover, and a disk provided inside the holder.

Abstract: A secondary battery includes a container member, a battery device, a cover member, and a sealing member. The container member includes a bent part defining an open end part. The battery device is contained inside the container member. The cover member closes the open end part. The sealing member is interposed between the bent part and the cover member. The cover member includes a first bottom surface, a first top surface, and a first side surface. The first bottom surface is opposed to the battery device. The first top surface is positioned on an opposite side to the first bottom surface. The first side surface is coupled to each of the first bottom surface and the first top surface. The bent part is provided along the first bottom surface, the first side surface, and the first top surface in this order and includes a tip part. The tip part is provided along the first side surface and the first top surface in this order.

Abstract: A secondary battery includes a battery can and a cover member. The battery can has a container-shaped structure and contains a battery device inside. The cover member is attached to an open surface of the battery can via a gasket. The cover member includes stainless steel coated with nickel plating. The nickel plating has a crystal structure in which a proportion of columnar crystals is greater than or equal to 80%.

Abstract: Provided is a battery capable of maintaining electrical insulation between a battery lid and a battery can when exposed to an aqueous solution such as sea water. Disclosed is a secondary battery including an electrode winding body in which a strip-shaped positive electrode and a strip-shaped negative electrode are stacked with a separator interposed between the electrodes and wound, an electrolytic solution, and a battery can that houses the electrode winding body and the electrolytic solution, the battery can having an opening hermetically sealed by a safety valve mechanism and a battery lid with a gasket interposed therebetween, in which the battery lid includes a terminal portion and a flange portion, and a metal layer is included between an outer main surface of among main surfaces of the flange portion and the gasket.

Abstract: A secondary battery includes a battery element including a positive electrode, a negative electrode, and an electrolytic solution, a housing member configured to accommodate the battery element, and a safety valve mechanism attached to the housing member. The safety valve mechanism includes a valve member including an opening valve portion configured to be opened; and an opening member including a plurality of opening portions radially arranged in a region opposed to the opening valve portion from a center of the region as a base point, and a plurality of protrusion portions radially arranged in a region outside the plurality of opening portions from the center and the plurality of protrusion portions protrude toward the plurality of opening portions. A number of the opening portions and a number of the protrusion portions are equal to each other, and each of the plurality of opening portions and each of the plurality of protrusion portions are opposed to each other in a direction toward the center.

Abstract: A secondary battery includes: an electrode wound body having a structure in which a strip-shaped negative electrode and a strip-shaped positive electrode opposing each other are laminated and wound with a separator interposed therebetween; a battery can accommodating the electrode wound body; and a battery lid provided over a cavity of the battery can, wherein the positive electrode has a positive electrode end that is located toward the battery lid, the battery can includes: a thick portion that is located toward the battery lid; a thin portion that is located toward a can bottom and has a thickness smaller than a thickness of the thick portion; and a thickness varying portion between the thick portion and the thin portion, and in a sectional view, the thick portion is disposed so as to overlap the positive electrode end.

Abstract: A secondary battery includes a battery element including a positive electrode, a negative electrode, and an electrolytic solution, a housing member having an open end and configured to accommodate the battery element, and a safety valve mechanism attached to the housing member and configured to close the open end. The safety valve mechanism includes a closing member and a coupling member disposed between the battery element and the closing member. The coupling member is electrically coupled to both of a wound electrode body and the closing member, and has a coupling portion physically coupled to the closing member, and a groove is provided in at least part of a peripheral region of the coupling portion.

Abstract: A secondary battery including an electrode wound body having a structure in which a band-shaped positive electrode and a band-shaped negative electrode are stacked and wound with a separator interposed therebetween, an electrolyte solution, a battery can that accommodates the electrode wound body and the electrolyte solution, a battery lid that closes an open end portion of the battery can, and a safety valve mechanism provided between the battery lid and the electrode wound body, wherein the safety valve mechanism includes at least a safety cover, an outer peripheral portion of the battery lid and an outer peripheral portion of the safety cover are joined, and an area of a region where the outer peripheral portion of the battery lid and the outer peripheral portion of the safety cover are joined is 18.1% or more and 25.0% or less of a sectional area of the battery in a radial direction.

Abstract: There is provided a secondary battery in which a positive electrode and a negative electrode are laminated with a separator interposed therebetween, and an electrode winding body having a wound structure, an electrolytic solution, and a positive electrode tab connected to the positive electrode are accommodated in an outer can. An insulator is disposed in proximity to an end on a side of the positive electrode tab of the electrode winding body. The electrode winding body and the insulator each have a center hole. A diameter or size of the center hole of the insulator is larger than a diameter of the center hole of the electrode winding body and is smaller than 1.1 times a width of the positive electrode tab.

Abstract: A secondary battery includes a housing member having a bent portion defining an open end, a battery element, a lid member which extends in a cross direction crossing a housing direction of the battery element to the housing member to close the open end of the housing member and has a bottom surface facing the battery element, a top surface opposite to the bottom surface, and a side surface coupled to the bottom surface and the top surface, and a sealing member interposed between the bent portion and the lid member. The bent portion includes a specific bent portion bent along each of the side surface and the top surface of the lid member. A bending ratio R1 (=(L1/D1)×100%) is 10% or more and 13% or less.

Abstract: A battery includes a safety valve configured to cause a deformation due to an increase in internal pressure of the battery; a restraining part including a plurality of first protrusions provided along a first circumference to serve as a restrainer against a lead part when the safety valve and the lead part are shut off due to deformation of the safety valve; and an insulating holder including a plurality of second protrusions provided along a second circumference to insulate the safety valve and the restraining part, where a number of the first protrusions and the second protrusions arranged on a diagonal line including the first circumference and the second circumference is 3 or less.

Abstract: A battery includes: an electrode body; and a battery can housing the electrode body and having a bottom portion. The bottom portion has an arc-shaped groove. An opening angle of the groove with respect to a center of the bottom portion is 0.5 degrees or more and 56 degrees or less. A ratio of an inner diameter of the groove with respect to an outer diameter of the bottom portion is 44% or more and 77% or less.

Abstract: A battery includes: an electrode body; and a battery can housing the electrode body and having a bottom portion. The bottom portion has an arc-shaped groove. An opening angle of the groove with respect to a center of the bottom portion is 0.5 degrees or more and 56 degrees or less. A ratio of an inner diameter of the groove with respect to an outer diameter of the bottom portion is 44% or more and 77% or less.

Abstract: A secondary battery includes a battery element including a positive electrode, a negative electrode, and an electrolytic solution, a housing member having an open end and configured to accommodate the battery element, and a safety valve mechanism attached to the housing member and configured to close the open end. The safety valve mechanism includes a closing member and a coupling member disposed between the battery element and the closing member. The coupling member is electrically coupled to both of a wound electrode body and the closing member, and has a coupling portion physically coupled to the closing member, and a groove is provided in at least part of a peripheral region of the coupling portion.

Abstract: A secondary battery includes a housing member having a bent portion defining an open end, a battery element, a lid member which extends in a cross direction crossing a housing direction of the battery element to the housing member to close the open end of the housing member and has a bottom surface facing the battery element, a top surface opposite to the bottom surface, and a side surface coupled to the bottom surface and the top surface, and a sealing member interposed between the bent portion and the lid member. The bent portion includes a specific bent portion bent along each of the side surface and the top surface of the lid member. A bending ratio R1 (=(L1/D1)×100%) is 10% or more and 13% or less.

Abstract: A secondary battery having excellent battery characteristics and excellent reliability is provided. The secondary battery includes an electrode, an electrolytic solution, a can configured to accommodate the electrode and the electrolytic solution, and an insulator disposed between the electrode and the can, wherein a can bottom of the can has at least one recess, the insulator has at least one hole, and at least a part of the at least one recess and at least a part of the at least one hole have no overlap with each other.

Abstract: A secondary battery includes a battery element including a positive electrode, a negative electrode, and an electrolytic solution, a housing member configured to accommodate the battery element, and a safety valve mechanism attached to the housing member. The safety valve mechanism includes a valve member including an opening valve portion configured to be opened; and an opening member including a plurality of opening portions radially arranged in a region opposed to the opening valve portion from a center of the region as a base point, and a plurality of protrusion portions radially arranged in a region outside the plurality of opening portions from the center and the plurality of protrusion portions protrude toward the plurality of opening portions. A number of the opening portions and a number of the protrusion portions are equal to each other, and each of the plurality of opening portions and each of the plurality of protrusion portions are opposed to each other in a direction toward the center.

Abstract: A battery includes a safety valve configured to cause a deformation due to an increase in internal pressure of the battery; a restraining part including a plurality of first protrusions provided along a first circumference to serve as a restrainer against a lead part when the safety valve and the lead part are shut off due to deformation of the safety valve; and an insulating holder including a plurality of second protrusions provided along a second circumference to insulate the safety valve and the restraining part, where a number of the first protrusions and the second protrusions arranged on a diagonal line including the first circumference and the second circumference is 3 or less.

Abstract: A battery includes: an electrode body; and a battery can configured to accommodate the electrode body and include a bottom part. At least one surface of the bottom part has two or more grooves on a same circumference, a proportion of an inner diameter of the groove to an outer diameter of the bottom part is 44% or more, and a proportion of a total value of intervals of the grooves to a perimeter of the circumference is 2% or more and 24% or less.