JP2013191282A5

JP2013191282A5 -

Info

Publication number: JP2013191282A5
Application number: JP2012054510A
Authority: JP
Filing date: 2012-03-12
Publication date: 2015-04-16
Anticipated expiration: 2032-03-12

Claims

A storage element comprising an electrode body formed by winding a positive electrode, a negative electrode, and a separator around a winding axis,
The electrode body includes a core material disposed on the innermost inner periphery of the wound positive electrode, the negative electrode, and the separator,
The power storage element in which the core member has lower rigidity at the end in the longitudinal direction in the cross section perpendicular to the winding axis than at the center.

In the short direction in the cross section perpendicular to the winding axis, the ratio of the length of the core material to the width of the core material is the space occupancy rate,
The power storage element according to claim 1, wherein the core material has a smaller space occupancy rate at an end portion in the longitudinal direction than at a central portion in a state where the positive electrode, the negative electrode, and the separator are not wound.

A storage element comprising an electrode body formed by winding a positive electrode, a negative electrode, and a separator around a winding axis,
The electrode body includes a core material disposed on the innermost inner periphery of the wound positive electrode, the negative electrode, and the separator,
In the short direction in the cross section perpendicular to the winding axis, when the ratio of the length of the core material to the width of the core material is defined as the space occupancy, the core material includes the positive electrode and the negative electrode. In a state where the separator is not wound, the end portion in the longitudinal direction has a smaller space occupancy rate than the central portion.
Power storage element.

The core material is composed of a plate-shaped member,
As for the said plate-shaped member, the thickness of the said transversal direction is thinner at the edge part of the said longitudinal direction than the center part
The electrical storage element of Claim 2 or 3 .

In the core material, a space is formed in which the end in the longitudinal direction has a greater width in the lateral direction than the center.
The electrical storage element of any one of Claims 2-4 .

An electrode body that is provided in a storage element and is formed by winding a positive electrode, a negative electrode, and a separator around a winding axis,
A core material disposed on the innermost inner periphery of the wound positive electrode, the negative electrode, and the separator;
The core member has a lower rigidity at an end portion in a longitudinal direction in a cross section perpendicular to the winding axis than a central portion.

A core material disposed inside the innermost circumference of the wound positive electrode, negative electrode, and separator of an electrode body formed by winding a positive electrode, a negative electrode, and a separator around a winding axis. And
The core material has a lower rigidity at the end in the longitudinal direction in the cross section perpendicular to the winding axis than at the center.

A winding shaft that is inserted into the core material according to any one of claims 1 to 7 and wound around a winding axis of a positive electrode, a negative electrode, and a separator to form an electrode body,
A winding shaft in which the end in the longitudinal direction in the cross section perpendicular to the winding axis has a greater width in the short direction in the cross section perpendicular to the winding axis than the center.