# US 10,319,979 B2 · Battery and method of manufacturing battery

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- Number: US 10,319,979 B2
- Document ID: US10319979B2
- Status: Granted
- Kind: B2
- Application number: 15/120,442
- Filed: 2015-01-26
- Published: 2017-03-09
- Granted: 2019-06-11
- Earliest claimed: 2014-02-27
- Assignees: Sanyo Electric Co., Ltd.
- Applicants: Sanyo Electric Co., Ltd.
- Inventors: Shin Haraguchi; Kyosuke Miyata; Koji Funami
- Web page: https://patentgrep.com/patent/US10319979B2

## CPC

- H01M 10/0422: {Cells or battery with cylindrical casing}
- H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence)
- H01M 50/533: characterised by the shape of the leads or tabs
- H01M 50/534: characterised by the material of the leads or tabs
- H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks
- 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 a power generation component including a positive electrode, a negative electrode, and an electrolyte, and a battery case accommodating the power generation component. The negative electrode includes a first lead (17) having a single layer structure whose main component is nickel, and a second lead (18) having a layered structure including a Ni layer (18a) whose main component is nickel and a Cu layer (18b) whose main component is copper. The battery includes a layered portion (35) formed of the leads that are superposed such that the Ni layer (18a) of the second lead (18) faces the first lead (17). Part of the layered portion (35) is welded to an inner surface of the battery case with the first lead (17) at the layered portion (35) being disposed on a battery case side.

## Claims

### Claim 1

A battery comprising: a power generation component including a positive electrode, a negative electrode, and an electrolyte, and a battery case accommodating the power generation component,
wherein the negative electrode includes a first lead having a single layer structure whose main component is nickel, and a second lead having a layered structure including a Ni layer whose main component is nickel and a Cu layer whose main component is copper,
wherein a layered portion is formed of the leads that are superposed such that the Ni layer of the second lead faces the first lead, and
wherein part of the layered portion is welded to an inner surface of the battery case with the first lead at the layered portion being disposed on a battery case side.

### Claim 2 (depends on 1)

The battery according to claim 1, wherein a recessed portion is formed on an outer surface of the battery case so as to correspond to a weld area of the layered portion.

### Claim 3 (depends on 1)

The battery according to claim 1, wherein a ratio of a thickness of the Ni layer to a thickness of the second lead is at least 50% or more.

### Claim 4 (depends on 1)

The battery according to claim 1, wherein a Ni plating layer is disposed on the inner surface of the battery case.

### Claim 5

A method of manufacturing a battery including a power generation component including a positive electrode, a negative electrode, and an electrolyte, and a battery case accommodating the power generation component, comprising:
a step of attaching, to the negative electrode, a first lead having a single layer structure whose main component is nickel, and a second lead having a layered structure including a Ni layer whose main component is nickel and a Cu layer whose main component is copper, and
a welding step of forming a layered portion in a manner in which the leads are superposed such that the Ni layer of the second lead faces the first lead and welding part of the layered portion to an inner surface of the battery case with the first lead at the layered portion facing a battery case side.

### Claim 6 (depends on 5)

The method according to claim 5, wherein, in the welding step, a laser beam is emitted from an outer surface side of the battery case to weld the part of the layered portion to the inner surface of the battery case.

### Claim 7 (depends on 5)

The method according to claim 5, wherein a Ni plating layer is disposed on the inner surface of the battery case.