Cylindrical battery capable of preventing occurrence of defects due to vibration-absorbing ring
A cylindrical battery, comprising: a cylindrical casing having a bottom, and has a short-diameter part near an opening thereof; an electrode assembly that is housed in the casing; and a sealing plate that seals the opening, wherein an insulating ring is inserted in a gap between the electrode assembly and the short-diameter part, the insulating ring including a main body, and at least three projections that are dispersively located and project outward from an outer edge of the main body in a diameter direction, and a distance between a design center point of the insulating ring and an outer edge of the main body is not longer than D/2 and a distance between the design center point and an outer edge of each of the projections is longer than D/2 and not longer than 102D/200, where D is an inside diameter of the casing measured within the space.
1. A cylindrical battery, comprising:
a casing that is in a shape of a cylinder having a bottom, and has a short-diameter part near an opening thereof;
an electrode assembly that is housed in the casing; and
a sealing plate that seals the opening,
wherein an insulating ring is inserted in a gap between the electrode assembly and the short-diameter part,
the insulating ring including a main body, and at least three projections that are dispersively located and project outward from an outer edge of the main body in a diameter direction, and
a distance between a design center point of the insulating ring and an outer edge of the main body is not longer than D/2 and a distance between the design center point and an outer edge of each of the projections is longer than D/2 and not longer than 102D/200, where D is an inside diameter of the casing measured within the gap.
2. The battery of claim 1 ,
wherein a count of the projections is up to eight.
3. A manufacturing method for a cylindrical battery,
comprising the steps of:
housing an electrode assembly in a casing that is in a shape of a cylinder having a bottom;
swaging the casing near an opening thereof to form a short-diameter part; and
placing a sealing plate on the short-diameter part and sealing the short-diameter part with the sealing plate,
wherein the method further comprises the step of:
placing an insulating ring onto the electrode assembly after the electrode assembly has been housed in the casing and before the short-diameter part has been formed,
the insulating ring including a main body, and at least three projections that are dispersively located and project outward from an outer edge of the main body in a diameter direction,
a distance between a design center point of the insulating ring and an outer edge of the main body is not longer than D/2 and a distance between the design center point and an outer edge of each of the projections is longer than D/2 and not longer than 102D/200, where D is an inside diameter of the casing, and
in the step of swaging, the short-diameter part is formed nearer the opening than where the insulating ring is placed.
4. The manufacturing method of claim 3 ,
wherein the insulating ring is pressed from the opening to a bottom in the step of placing.