# US 10,118,251 B2 · Manufacturing method for welded structure

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- Number: US 10,118,251 B2
- Document ID: US10118251B2
- Status: Granted
- Kind: B2
- Application number: 15/219,537
- Filed: 2016-07-26
- Published: 2017-02-02
- Granted: 2018-11-06
- Earliest claimed: 2015-07-31
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Akira Tsukui
- Web page: https://patentgrep.com/patent/US10118251B2

## CPC

- B23K 26/0676: {into dependently operating sub-beams, e.g. an array of spots with fixed spatial relationship or for performing simultaneously identical operations}
- B23K 26/082: Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
- B23K 26/26: of rectilinear seams
- B23K 26/28: of curved planar seams
- B23K 26/32: taking account of the properties of the material involved
- B23K 26/323: involving parts made of dissimilar metallic material
- H01M 50/169: by welding, brazing or soldering
- B23K 2101/36: Electric or electronic devices
- B23K 2103/10: Aluminium or alloys thereof
- B23K 2103/18: Dissimilar materials
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/55: on the same side of the cell
- H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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 manufacturing method includes i) emitting a primary laser beam along a primary trajectory on a boundary between a first member and a second member by a welding apparatus; ii) emitting an advanced laser beam along an advanced trajectory that does not overlap the primary trajectory by the welding apparatus; and iii) emitting a subsequent laser beam along a subsequent trajectory that does not overlap the primary trajectory and the advanced trajectory by the welding apparatus.

## Claims

### Claim 1

A manufacturing method for a welded structure, the welded structure being manufactured by joining a boundary between a first member and a second member that abut against each other by laser welding using a welding apparatus, and the welding apparatus that emits a primary laser beam scanning the boundary between the first member and the second member, an advanced laser beam that an irradiation position of the advanced laser beam is in front of an irradiation position of the primary laser beam in a direction of movement, and a subsequent laser beam that an irradiation position of the subsequent laser beam is at rear of the irradiation position of the primary laser beam in the direction of movement,
the manufacturing method comprising:
emitting the primary laser beam along a primary trajectory on the boundary between the first member and the second member by the welding apparatus;
emitting the advanced laser beam along an advanced trajectory that does not overlap the primary trajectory by the welding apparatus; and
emitting the subsequent laser beam along a subsequent trajectory that does not overlap the primary trajectory and the advanced trajectory by the welding apparatus.

### Claim 2 (depends on 1)

The manufacturing method according to claim 1, wherein
the advanced laser beam and the subsequent laser beam are emitted by the welding apparatus such that the irradiation position of the advanced laser beam and the irradiation position of the subsequent laser beam become symmetrical about an inclination axis, the inclination axis passes through the irradiation position of the primary laser beam, and the inclination axis is inclined with respect to the primary trajectory,
the advanced laser beam includes a first advanced laser beam and a second laser beam, an irradiation position of the first advanced laser beam is on the first member side of the primary trajectory, and an irradiation position of the second advanced laser beam is on the second member side of the primary trajectory, and
as the subsequent laser beam includes a first subsequent laser beam and a second subsequent laser beam, an irradiation portion of the first subsequent laser is on the first member side of the primary trajectory, and an irradiation position of the second subsequent laser beam is on the second member side of the primary trajectory.

### Claim 3 (depends on 1)

The manufacturing method according to claim 1, wherein
a melted section is formed in front of the irradiation position of the primary laser beam on the primary trajectory by melting the irradiation position of the advanced laser beam with the advanced laser beam,
depth of the melted section at the irradiation position of the primary laser beam is made greater by the primary laser beam than depth of the melted section before irradiation of the primary laser beam, and
depth of the melted section at the irradiation position of the subsequent laser beam is made greater by the subsequent laser beam than depth of the melted section before irradiation of the subsequent laser beam.