Energy storage cell

Abstract

To provide a power storage cell in which a metal body is restrained from contacting a composite layer on one end side of an electrode body.SOLUTION: A power storage cell includes a wound electrode body 10 and an insulating member 61, the electrode body 10 includes a first end portion 5 and a second end portion, and the sheet body includes a first electrode sheet 22, a second electrode sheet 24, and a separator. The first electrode sheet 22 includes a first current collector and a first electrode composite layer, the first current collector includes a first uncoated portion, and the first uncoated portion is located at the first end portion and includes a plurality of first metal pieces 22 arranged in the winding direction of the sheet body. The first metal pieces 22 extend so as to approach the winding axis, the second electrode sheet 24 includes a second current collector and a second electrode composite layer, the second electrode sheet 24 includes a first side portion located at the first end portion, and at least one insulating member 61 includes a first insulating member 61 formed on the first side portion.SELECTED DRAWING: Figure 5

Claims

1. An electrode body is wound around a winding axis, The electrode body comprises at least one insulating member, The electrode body includes a first end located at the end in the direction in which the winding axis extends, and a second end located at the other end of the first end, The sheet body includes a first electrode sheet, a second electrode sheet, and a separator disposed between the first electrode sheet and the second electrode sheet. The first electrode sheet includes a first current collector and a first electrode composite layer formed on the first current collector. The first current collector includes a first uncoated portion to which the first electrode composite layer is not coated. The first uncoated portion includes a plurality of first metal pieces located at the first end and arranged in the winding direction of the sheet body. The first metal piece extends toward the winding axis, The second electrode sheet includes a second current collector and a second electrode composite layer formed on the second current collector. The second electrode sheet includes a first side portion located at the first end, The at least one insulating member includes a first insulating member formed on the first side, The first insulating member includes a plurality of insulating pieces formed at intervals along the first edge, The spacing between the insulating pieces is smaller than the width of the first metal piece. Energy storage cell.

2. The second current collector includes a second uncoated portion to which the second electrode composite layer is not coated. The second uncoated portion includes a plurality of second metal pieces located at the second end and arranged in the winding direction, The second metal piece extends toward the winding axis, The first electrode sheet includes a second side portion located at the second end, The energy storage cell according to claim 1, wherein the at least one insulating member includes a second insulating member formed on the second side.

3. The first insulating member has a welded portion formed on it, which is welded to the separator. The energy storage cell according to claim 1.

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