# US 2021/0280840 A1 · Electrode group and battery

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- Number: US 2021/0280840 A1
- Document ID: US20210280840A1
- Status: Published application
- Kind: A1
- Application number: 17/094,884
- Filed: 2020-11-11
- Published: 2021-09-09
- Earliest claimed: 2020-03-09
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Masatoshi TANABE; Kazuo SHIMOKAWA; Takahiro AIZAWA; Takashi ITO
- Web page: https://patentgrep.com/patent/US20210280840A1

## CPC

- H01M 50/533: characterised by the shape of the leads or tabs
- H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks
- H01M 4/70: characterised by shape or form
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection
- H01M 50/55: on the same side of the cell
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- 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

An electrode group includes a positive electrode, a negative electrode, and a current collecting tab. The current collecting tab is provided in one of the positive electrode and the negative electrode, and protrudes relative to the other of the positive electrode and the negative electrode. The current collecting tab is formed with one or more slit parts penetrating the current collecting tab in a thickness direction intersecting a protruding direction of the current collecting tab. Each of the one or more slit parts extends along a width direction intersecting both the protruding direction and the thickness direction. At each of the one or more slit parts, a circular portion is formed at at least one of the two ends in the width direction.

## Claims

### Claim 1

An electrode group comprising:
a positive electrode and a negative electrode; and
a current collecting tab provided in one of the positive electrode and the negative electrode and protruding relative to another of the positive electrode and the negative electrode,
wherein
the current collecting tab is formed with one or more slit parts penetrating the current collecting tab in a thickness direction intersecting a protruding direction of the current collecting tab,
each of the one or more slit parts extends along a width direction intersecting both the protruding direction and the thickness direction, and
in each of the one or more slit parts, a circular portion is formed at at least one of two ends in the width direction.

### Claim 2 (depends on 1)

The electrode group according to claim 1, wherein
the current collecting tab includes a first tab edge that forms one end of the current collecting tab in the width direction, and a second tab edge that forms an end on a side opposite to the first tab edge of the current collecting tab in the width direction, and
in at least one of the one or more slit parts, the circular portion is formed at one end in the width direction, and an end on a side opposite to the circular portion in the width direction is located at one of the first tab edge and the second tab edge.

### Claim 3 (depends on 1)

The electrode group according to claim 1, wherein in at least one of the one or more slit parts, the circular portion is formed at both of the two ends in the width direction.

### Claim 4 (depends on 1)

The electrode group according to claim 1, wherein
the one or more slit parts are a plurality of slit parts, and
at least one of the plurality of slit parts is formed at a position offset from another slit part in the protruding direction of the current collecting tab.

### Claim 5 (depends on 1)

The electrode group according to claim 1, wherein
the one or more slit parts are a plurality of slit parts, and
at least one of the plurality of slit parts is formed at a position offset from another slit part in the width direction of the current collecting tab.

### Claim 6 (depends on 1)

The electrode group according to claim 1, wherein
the current collecting tab includes a positive electrode current collecting tab protruding relative to the negative electrode, and a negative electrode current collecting tab protruding in the negative electrode to a side opposite to a side to which the positive electrode current collecting tab protrudes, and
the one or more slit parts are formed in at least one of the positive electrode current collecting tab and the negative electrode current collecting tab.

### Claim 7 (depends on 1)

A battery comprising:
the electrode group according to claim 1; and
an electrode terminal electrically connected to the current collecting tab of the electrode group.