# US 11,444,271 B2 · Lithium-ion battery including electrode with tab section having substrate-exposed portion

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- Number: US 11,444,271 B2
- Document ID: US11444271B2
- Status: Granted
- Kind: B2
- Application number: 16/640,208
- Filed: 2018-11-02
- Published: 2020-06-11
- Granted: 2022-09-13
- Earliest claimed: 2018-11-02
- Assignees: Panasonic Holdings Corporation; Sanyo Electric Co., Ltd.
- Applicants: Panasonic Corporation; SANYO Electric Co., Ltd.
- Inventors: Yuma Kamiyama; Ryosuke Iwata; Katsuya Shiozaki
- Web page: https://patentgrep.com/patent/US11444271B2

## CPC

- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence)
- H01M 50/55: on the same side of the cell
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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

A battery includes an electrode assembly having a positive electrode and a negative electrode. The positive electrode includes a positive electrode substrate, a positive electrode active material layer formed on the surface of the positive electrode substrate, and a positive tab section having a substrate-exposed portion in which the positive electrode active material layer is not formed on the surface. The positive electrode active material layer has a notch in the end of the positive electrode active material layer. The outer edge of the notch encloses an end of a boundary where the positive tab section and the positive electrode active material layer come into contact.

## Claims

### Claim 1

A lithium-ion battery comprising an electrode assembly including a first electrode and a second electrode, wherein:
the first electrode includes a substrate, a first active material layer formed on a surface of the substrate, and a first tab section having a substrate-exposed portion in which the first active material layer is not formed on the surface;
the first active material layer has one or more notches in an end of the first active material layer; and
an outer edge of the notches encloses an end of a boundary where the first tab section and the first active material layer come into contact,
wherein
in the electrode assembly, a terminal edge of the notches on a side of the first tab section is placed at a position that does not overlap a second active material layer of the second electrode when viewed from a stacking direction of the first electrode and the second electrode.

### Claim 2 (depends on 1)

The lithium-ion battery according to claim 1, wherein the notches are in an end of the first tab section.

### Claim 3 (depends on 1)

The lithium-ion battery according to claim 1, wherein a contact portion of the outer edge of the notches with the first active material layer has a circular arc or an elliptical arc when viewed from the stacking direction of the first electrode and the second electrode.

### Claim 4 (depends on 1)

The lithium-ion battery according to claim 1, wherein the substrate is an aluminum foil or an aluminum alloy foil.

### Claim 5 (depends on 1)

The lithium-ion battery according to claim 1, wherein the notches are at both ends of the boundary.

### Claim 6 (depends on 1)

The lithium-ion battery according to claim 1, wherein:
the first electrode is a positive electrode and the second electrode is a negative electrode; and
the first active material layer has a filling density of an active material of 3.5 g/cm3 or more.