Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-12002928-B2
Application number	US-201917058365-A
Country	US
Kind code	B2
Filing date	May 24, 2019
Priority date	Jun 7, 2018
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

A nonaqueous electrolyte secondary battery includes a roll-type electrode group including positive and negative electrode plates and a tape attached to the outermost circumferential surface of the electrode group. The tape has two adhesion regions including an adhesive layer and a non-adhesion region that is interposed between the two adhesion regions and is composed of a base material layer only. The non-adhesion region straddles the rolling-end edge of at least one of the positive or negative electrode active material layer on the roll inner side of the positive or negative electrode collector and the positive or negative electrode active material layer on the roll outer side of the positive or negative electrode collector in the positive or negative electrode plate when the electrode group is viewed from a roll center axis toward the outside of the roll.

First claim

The invention claimed is:

1. A nonaqueous electrolyte secondary battery comprising:
a roll electrode group including a positive electrode plate, in which a positive electrode active material layer is disposed on each of a roll inner surface and a roll outer surface of a band positive electrode collector, and a negative electrode plate, in which a negative electrode active material layer is disposed on each of a roll inner surface and a roll outer surface of a band negative electrode collector, that are rolled with a separator interposed therebetween; and
a tape attached to an outermost circumferential surface of the electrode group so as to fix a rolling-end edge of the electrode group to the outermost circumferential surface of the electrode group,
wherein the tape has two adhesion regions including a base material layer and an adhesive layer and a non-adhesion region that is interposed between the two adhesion regions and that is composed of the base material layer only, and
wherein the non-adhesion region straddles a rolling-end edge of each of the positive electrode active material layer on a roll inner side of the positive electrode collector and the positive electrode active material layer on a roll outer side of the positive electrode collector when the electrode group is viewed from a roll center axis of the roll electrode group toward an outside of the roll electrode group, and
the negative electrode plate includes a plain region in which the negative electrode active material layer is not disposed on either surface of the negative electrode collector in an end portion of a rolling-end side thereof.

2. The nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the non-adhesion region straddles the rolling-end edge of each of the positive electrode active material layer on the roll inner side of the positive electrode collector, the positive electrode active material layer on the roll outer side of the positive electrode collector, the negative electrode active material layer on the roll inner side of the negative electrode collector, and the negative electrode active material layer on the roll outer side of the negative electrode collector when the electrode group is viewed from the roll center axis toward the outside of the roll.

3. A nonaqueous electrolyte secondary battery comprising:
a roll electrode group including a positive electrode plate, in which a positive electrode active material layer is disposed on each of a roll inner surface and a roll outer surface of a band positive electrode collector, and a negative electrode plate, in which a negative electrode active material layer is disposed on each of a roll inner surface and a roll outer surface of a band negative electrode collector, that are rolled with a separator interposed therebetween, and
a tape attached to an outermost circumferential surface of the electrode group so as to fix a rolling-end edge of the electrode group to the outermost circumferential surface of the electrode group,
wherein the tape has two adhesion regions including a base material layer and an adhesive layer and a non-adhesion region that is interposed between the two adhesion regions and that is composed of the base material layer only, and
wherein the non-adhesion region straddles a rolling-end edge of each of the negative electrode active material layer on a roll inner side of the negative electrode collector and the negative electrode active material layer on a roll outer side of the negative electrode collector when the electrode group is viewed from a roll center axis of the roll electrode group toward an outside of the roll electrode group; and
the negative electrode plate includes a plain region in which the negative electrode active material layer is not disposed on either surface of the negative electrode collector in an end portion of a rolling-end side thereof.

Assignees

• Sanyo Electric Co
• Panasonic Energy Co Ltd

Inventors

• Nakao Takaki
• Kobayashi Kei
• Mizawa Atsushi

Classifications

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/0422

  Cells or battery with cylindrical casing · CPC title

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M10/0468

  Compression means for stacks of electrodes and separators · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title