# US 2014/0193710 A1 · Non-aqueous electrolyte secondary battery

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- Number: US 2014/0193710 A1
- Document ID: US20140193710A1
- Status: Published application
- Kind: A1
- Application number: 14/241,775
- Filed: 2012-08-30
- Published: 2014-07-10
- Earliest claimed: 2011-08-31
- Assignees: NEC Energy Devices, Ltd.
- Inventors: Takuya Hasegawa
- Web page: https://patentgrep.com/patent/US20140193710A1

## CPC

- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/05: Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence)
- H01M 50/178: for pouch or flexible bag cells
- H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

To provide a non-aqueous electrolyte secondary battery less subject to impact by vibration, impact, etc., and has stable characteristics. The non-aqueous electrolyte secondary battery includes: a positive electrode part in which a positive electrode active material layer is formed on a positive collector; a positive electrode which is provided with a positive electrode lead tab and which is integrally formed with the positive collector so as to be connected to a periphery of the positive electrode part through a curved portion continuing therefrom; a negative electrode part in which a negative electrode active material layer is formed on a negative collector; a negative electrode which is provided with a negative electrode lead tab and which is integrally formed with the negative collector so as to be connected to a periphery of the negative electrode part through a curved portion continuing therefrom; and a separator which is interposed between the positive and negative electrodes. A positive electrode active material layer is formed at least on both sides of the positive electrode lead tab, and a projection portion obtained by vertically projecting the positive electrode part on the negative electrode part exists inward an outline of the negative electrode active material layer.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

A non-aqueous electrolyte secondary battery comprising:
a positive electrode part in which, a positive electrode active material layer is formed on a positive collector;
a positive electrode which is provided with a positive electrode lead tab and which is integrally formed with the positive collector so as to be connected to a periphery of the positive electrode part through a curved portion continuing therefrom;
a negative electrode part in which a negative electrode active material layer is formed on a negative collector;
a negative electrode which is provided with a negative electrode lead tab and which is integrally formed with the negative collector so as to be connected to a periphery of the negative electrode part through a curved portion continuing therefrom; and
a separator which is interposed between the positive and negative electrodes, characterized in that
a positive electrode active material layer is formed at least on both sides of the positive electrode lead tab,
a joint portion between the positive electrode lead tab and collector has a curved portion, and
the positive electrode active material layer is formed in a region surrounded by the curved portions on both sides of the positive electrode lead tab.

### Claim 10 (depends on 9)

The non-aqueous electrolyte secondary battery according to claim 9, characterized in that
a projection portion obtained by vertically projecting the positive electrode part on the negative electrode part exists inward an outline of the negative electrode active material layer.

### Claim 11 (depends on 9)

The non-aqueous electrolyte secondary battery according to claim 9, characterized in that
the positive electrode active material layer is formed on a surface of the positive electrode lead tab that faces the negative electrode.

### Claim 12 (depends on 9)

The non-aqueous electrolyte secondary battery according to claim 9, characterized in that
the curved portion has a curvature radius r of 1 mm to 10 mm with respect to the lengths of a drawing direction of the positive electrode lead tab and a vertical direction thereof.

### Claim 13 (depends on 9)

The non-aqueous electrolyte secondary battery according to claim 9, characterized by being a stacked battery obtained by laminating a plurality of the positive electrodes and a plurality of the negative electrodes through separators.

### Claim 14 (depends on 9)

The non-aqueous electrolyte secondary battery according to claim 9, characterized in that
an outer upper end portion of the negative electrode lead tab positioned in an upper end portion of a side of the negative electrode from which the negative electrode lead tab is positioned above an inner upper end portion of the negative electrode lead tab.

### Claim 15 (depends on 9)

The non-aqueous electrolyte secondary battery according to claim 9, characterized in that
the curved portion is a circular arc.

### Claim 16 (depends on 9)

The non-aqueous electrolyte secondary battery according to claim 9, characterized by being a lithium-ion secondary battery.