# US 12,191,519 B2 · Secondary battery, method for manufacturing secondary battery, electronic device, and electric tool

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- Number: US 12,191,519 B2
- Document ID: US12191519B2
- Status: Granted
- Kind: B2
- Application number: 17/720,628
- Filed: 2022-04-14
- Published: 2022-07-28
- Granted: 2025-01-07
- Earliest claimed: 2019-12-16
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Kunio Sodeyama; Yu Nomura; Kosuke Yanagida; Noriaki Kokubu; Hidehiko Wakui
- Web page: https://patentgrep.com/patent/US12191519B2

## CPC

- H01M 50/342: Non-re-sealable arrangements
- H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member}
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence)
- H01M 50/169: by welding, brazing or soldering
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- 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 secondary battery including an electrode wound body having a structure in which a band-shaped positive electrode and a band-shaped negative electrode are stacked and wound with a separator interposed therebetween, an electrolyte solution, a battery can that accommodates the electrode wound body and the electrolyte solution, a battery lid that closes an open end portion of the battery can, and a safety valve mechanism provided between the battery lid and the electrode wound body, wherein the safety valve mechanism includes at least a safety cover, an outer peripheral portion of the battery lid and an outer peripheral portion of the safety cover are joined, and an area of a region where the outer peripheral portion of the battery lid and the outer peripheral portion of the safety cover are joined is 18.1% or more and 25.0% or less of a sectional area of the battery in a radial direction.

## Claims

### Claim 1

A secondary battery comprising:
an electrode wound body having a structure in which a band-shaped positive electrode and a band-shaped negative electrode are stacked and wound with a separator interposed therebetween;
an electrolyte solution;
a battery can that accommodates the electrode wound body and the electrolyte solution;
a battery lid that closes an open end portion of the battery can; and
a safety valve mechanism provided between the battery lid and the electrode wound body,
wherein the safety valve mechanism includes at least a safety cover,
an outer peripheral portion of the battery lid and an outer peripheral portion of the safety cover are joined, and
an area of a region where the outer peripheral portion of the battery lid and the outer peripheral portion of the safety cover are joined is 18.1% or more and 25.0% or less of a sectional area of the battery in a radial direction.

### Claim 2 (depends on 1)

The secondary battery according to claim 1, wherein the outer peripheral portion of the safety cover has a protrusion on a face opposite to a face welded to the battery lid.

### Claim 3

A method for manufacturing a secondary battery, the secondary battery comprising:
providing an electrode wound body having a structure in which a band-shaped positive electrode and a band-shaped negative electrode are stacked and wound with a separator interposed therebetween;
providing an electrolyte solution;
providing a battery can that accommodates the electrode wound body and the electrolyte solution;
providing a battery lid that closes an open end portion of the battery can; and
providing a safety valve mechanism provided between the battery lid and the electrode wound body,
wherein the safety valve mechanism includes at least a safety cover,
an outer peripheral portion of the battery lid and an outer peripheral portion of the safety cover are joined by a welding method, and
an area of a region where the outer peripheral portion of the battery lid and the outer peripheral portion of the safety cover are joined is 18.1% or more and 25.0% or less of a sectional area of the battery in a radial direction.

### Claim 4 (depends on 3)

The method for manufacturing a secondary battery according to claim 3, wherein the welding method is an ultrasonic welding method.

### Claim 5 (depends on 1)

An electronic device comprising the secondary battery according to claim 1.

### Claim 6 (depends on 1)

An electric tool comprising the secondary battery according to claim 1.

### Claim 7 (depends on 2)

An electronic device comprising the secondary battery according to claim 2.

### Claim 8 (depends on 2)

An electric tool comprising the secondary battery according to claim 2.