Method of welding laminated metal foils

Patent metadata

Field	Value
Publication number	US-10953498-B2
Application number	US-201815984955-A
Country	US
Kind code	B2
Filing date	May 21, 2018
Priority date	Jun 20, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

Provided is a method of welding laminated metal foils that can prevent blowholes and spatter from being formed. It is a method of welding laminated metal foils sandwiched between a pair of metal plates to the pair of metal plates. The method of welding laminated metal foils sandwiched between a pair of metal plates to the pair of metal plates includes locally pressing and crimping the laminated metal foils sandwiched between the pair of metal plates at a welding point in a laminating direction, and welding the crimped pair of metal plates and laminated metal foils at the welding point.

First claim

What is claimed is:

1. A method of welding laminated metal foils sandwiched between a pair of metal plates to the pair of metal plates, the method comprising:
locally pressing and crimping the laminated metal foils sandwiched between the pair of metal plates at a welding point in a laminating direction; and
welding the crimped pair of metal plates and laminated metal foils at the welding point,
wherein during crimping, a thickness of the crimped laminated metal foils is made 50% or less of a thickness of the laminated metal foils before crimping; and
wherein in the welding:
the welding point is irradiated with a laser beam to be welded and an irradiation condition of the laser beam is feedback-controlled based on intensity of thermal radiation light emitted from a molten pool formed by the irradiation of the laser beam;
contact of the molten pool with a base on which the pair of metal plates and the laminated metal foils are placed is detected based on the intensity of the thermal radiation light; and
when the contact of the molten pool with the base is detected, the irradiation of the molten pool with the laser beam is ended.

2. The method according to claim 1 , wherein mechanical clinching is employed as the crimping method.

3. The method according to claim 1 , wherein the laminated metal foils and the metal plates are deformed into U-shaped cross sections.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kobayashi Hiroomi
• Tateyama Nozomi
• Uchida Keisuke
• Ohashi Fuminori
• Shibata Yoshinori
• Koike Masaki

Classifications

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/54

  Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges · CPC title

• B23K2101/36

  Electric or electronic devices · CPC title

• B23K35/0238

  layered · CPC title

• B23K26/21 Primary

  by welding · CPC title