Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-11626614-B2
Application number	US-201916543779-A
Country	US
Kind code	B2
Filing date	Aug 19, 2019
Priority date	Feb 27, 2017
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

A positive electrode for this non-aqueous electrolyte secondary battery is provided with: a positive electrode current collector; a positive electrode active material layer formed on the positive electrode current collector; a positive electrode tab connected to an exposed portion at which the positive electrode current collector is exposed and on which the positive electrode active material layer is not formed; and a protective layer covering the exposed portion and the positive electrode tab on the exposed portion. The protective layer is composed of a base material including a curable resin.

First claim

The invention claimed is:

1. A non-aqueous electrolyte secondary battery comprising
a positive electrode and a negative electrode,
wherein at least any one of the positive electrode and the negative electrode comprises a collector, an active material layer formed on the collector, an electrode tab joined to an exposed portion where the active material layer is not formed and the collector is exposed, and a protective layer covering the electrode tab on the exposed portion and the exposed portion, and
the protective layer includes a substrate comprising a curable resin,
wherein the substrate included in the protective layer comprises an inorganic material,
wherein the inorganic material comprises at least any one of Al 2 O 3 , TiO 2 , ZrO 2 , SiO 2 , MnO 2 , MgO, Si 3 N 4 , BN, and boehmite; and
wherein the inorganic material in the substrate is concentrated on a side of the collector, such that more than 50% by weight of the inorganic material in the substrate is present within half a thickness of the substrate from a surface of the substrate facing the collector.

2. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the electrode tab extends outside of a peripheral portion of the collector, and the protective layer is also provided on at least a part of the electrode tab extending.

3. The non-aqueous electrolyte secondary battery according to claim 1 , comprising a battery case accommodating the positive electrode and the negative electrode, an opening of the battery case and a sealing plate sealing the opening,
wherein the electrode tab extends outside of a peripheral portion of the collector and is contact with the sealing plate, and the protective layer is provided on at least a part of the electrode tab between a peripheral portion of the collector and the sealing plate.

4. A non-aqueous electrolyte secondary battery comprising
a positive electrode and a negative electrode,
wherein at least any one of the positive electrode and the negative electrode comprises a collector, an active material layer formed on the collector, and a protective layer covering a boundary portion between an exposed portion where the active material layer is not formed and the collector is exposed and the active material layer,
the exposed portion is disposed at a longitudinal end of the current collector, and
the protective layer includes a substrate comprising a curable resin,
wherein the substrate included in the protective layer comprises an inorganic material,
wherein the inorganic material comprises at least any one of Al 2 O 3 , TiO 2 , ZrO 2 , SiO 2 , MnO 2 , MgO, Si 3 N 4 , BN, and boehmite; and
wherein the inorganic material in the substrate is concentrated on a side of the collector, such that more than 50% by weight of the inorganic material in the substrate is present within half a thickness of the substrate from a surface of the substrate facing the collector.

5. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the curable resin comprises at least any one of a thermosetting resin and a photocurable resin.

6. The non-aqueous electrolyte secondary battery according to claim 4 , wherein the curable resin comprises at least any one of a thermosetting resin and a photocurable resin.

7. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the protective layer is electrically insulative.

8. The non-aqueous electrolyte secondary battery according to claim 4 , wherein the protective layer is electrically insulative.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Takahashi Takahiro
• Shiozaki Tomoki

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/4235 Primary

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M10/0587

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

• H01M50/538

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title