US 8,045,320 B2Granted

Capacitor having collectors with separate regions between innermost and outermost circumferences of a wound element

AssigneePanasonic Corporation

InventorsToshitaka Hibi, Toshiyuki Kitagawa

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Abstract

A capacitor includes a wound element, and externally take-out electrode members corresponding respectively to a first pole and a second pole and connected to each one of end faces of the wound element. This capacitor features that the wound element is positively fixed to the externally take-out electrode members, and has advantageously a small internal resistance. Collectors in inner circumference region of the wound element are bent in an opposite direction to a core of a winding shaft, and collectors in an outer circumference region are bent toward the core of the winding shaft. End faces of these collectors are connected to a lid, thereby forming a first pole of the capacitor, and end faces of those collectors are connected to a housing, thereby forming a second pole of the capacitor.

Claims15

Dependent claims

A capacitor comprising:

a wound element including:
a first electrode unit having a first collector and a first polarization electrode on both sides of the first collector;
a second electrode unit having a second collector and a second polarization electrode on both sides of the second collector;
and
a first separator and a second separator between the first electrode unit and the second electrode unit,
a cylindrical housing with a bottom plate;
a lid of the housing, which lid has a hole therein;
a winding shaft;
a first annular insulating member;
a second annular insulating member;
a stopper to cover the hole;
and
an electrolyte within the housing,
wherein the first electrode unit in the wound element is in contact with the lid at a first end face of the first collector, thereby comprising a first pole, and the second electrode unit in the wound element is in contact with the cylindrical housing at a second end face of the second collector, thereby comprising a second pole,
wherein the first collector has a border section between an inner most circumference and an outer most circumference of the wound element, and includes a first region between the inner most circumference and the border section, and a second region between the border section and the outer most circumference,
wherein the second collector also has a border section between the inner most circumference and the outer most circumference of the wound element, and includes a first region between the inner most circumference and the border section, and a second region between the border section and the outer most circumference,
wherein parts of each of the first and the second collectors, in which there is no first or second polarization electrode, in the first regions at the first and the second end faces, are bent toward the outer circumference of the wound element, and
wherein parts of each of the first and the second collectors, in which there is no first or second polarization electrode, in the second regions at the first and the second end faces, are bent toward a core of the wound element.

15 more elements

A capacitor comprising:

a wound element including:
a first electrode unit having a first collector and a first polarization electrode on both sides of the first collector;
a second electrode unit having a second collector and a second polarization electrode on both sides of the second collector;
and
a first separator and a second separator between the first electrode unit and the second electrode unit,
a cylindrical housing with a bottom plate;
a lid of the housing, which lid has a hole therein;
a winding shaft;
a first annular insulating member;
a second annular insulating member;
a stopper to cover the hole;
and
an electrolyte in the housing,
wherein the first electrode unit in the wound element is in contact with the lid at a first end face of the first collector, thereby comprising a first pole, and the second electrode unit in the wound element is in contact with the cylindrical housing at a second end face of the second collector, thereby comprising a second pole,
wherein the first collector has a first border section and a second border section between an inner most circumference and an outer most circumference of the wound element, and includes a first region between the inner most circumference and the first border section, a second region between the first border section and the second border section, and a third region between the second border section and the outer most circumference,
wherein the second collector also has a first border section and a second border section between the inner most circumference and the outer most circumference of the wound element, and includes a first region between the inner most circumference and the first border section, a second region between the first border section and the second border section, and a third region between the second border section and the outer most circumference,
wherein parts of each of the first and the second collector collectors, in which no first or second polarization electrode exists, in the first regions at the first and the second end faces, are slanted toward the outer circumference of the wound element and welded, and
wherein parts of each of the first and the second collectors, in which no first or second polarization electrode exists, in the second regions at the first and the second end faces, are slanted toward a core of the wound element and welded.

15 more elements

Dependencies are inferred from the claim text.