Pulse laser welding aluminum alloy material, and battery case

Patent metadata

Field	Value
Publication number	US-9741978-B2
Application number	US-81023608-A
Country	US
Kind code	B2
Filing date	Dec 18, 2008
Priority date	Dec 28, 2007
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

This aims to provide a pulse laser welding aluminum alloy material, which can prevent the occurrence of an abnormal portion, when an A1000-series aluminum material is welded with a pulse laser, so that a satisfactory welded portion can be homogeneously formed, and a battery case. The pulse laser welding aluminum alloy material is made of an A1000-series aluminum material, and has a viscosity of 0.0016 Pa·s or less in a liquid phase. Alternatively, the pulse laser welding aluminum alloy material has such a porosity generation rate of 1.5 (μm 2 /mm) or less in the pulse-laser welded portion as is numerically defined by dividing the porosity total area (μm 2 ), as indicated by the product of the sectional area and the number of porosities, by the length (mm) of an observation section.

First claim

The invention claimed is:

1. A pulse laser welding aluminum alloy material comprising an A1000-series aluminum material and having a viscosity of 0.0016 Pa·s or less in a liquid phase,
wherein the aluminum alloy material comprises:
Si: 0.35 mass % or less,
Fe: 0.6 mass % or less,
Cu: 0.1 mass % or less,
Mn: 0.05 mass % or less,
Mg: 0.05 mass % or less,
Zn: 0.1 mass % or less,
Ti: 0.1 mass % or less and 0.001 mass % or more, and
B: 6 ppm or less,
with the remainder consisting of Al and unavoidable impurities, and
wherein boron is present in the aluminum alloy material and is present in an amount of 6 ppm or less.

2. A pulse laser welding aluminum alloy material according to claim 1 , wherein the viscosity is 0.0012 Pa·s or less.

3. A pulse laser welding aluminum alloy material wherein: the aluminum alloy material comprises an A1000-series aluminum material; and a porosity generation rate at a pulse laser welded portion numerically defined by dividing the total porosity sectional area (μm 2 ) indicated by the product of the sectional area and the number of porosities by the length (mm) of the observation section is 1.5 (μm 2 /mm) or less,
wherein the aluminum alloy material comprises:
Si: 0.35 mass % or less,
Fe: 0.6 mass % or less,
Cu: 0.1 mass % or less,
Mn: 0.05 mass % or less,
Mg: 0.05 mass % or less,
Zn: 0.1 mass % or less,
Ti: 0.1 mass % or less and 0.001 mass % or more, and
B: 6 ppm or less,
with the remainder consisting of Al and unavoidable impurities, and
wherein boron is present in the aluminum alloy material and is present in an amount of 6 ppm or less.

4. A pulse laser welding aluminum alloy material according to claim 3 , wherein the porosity generation rate is 1.1 (μm 2 /mm) or less.

5. A method for producing a battery case comprising:
using a pulse laser welding aluminum alloy material for a case main body and a lid; and
welding and sealing the case main body and the lid with a pulse laser,
wherein the aluminum alloy includes an A1000-series aluminum material and has a viscosity of 0.0016 Pa·s or less in a liquid phase,
wherein the aluminum alloy material comprises:
Si: 0.35 mass % or less,
Fe: 0.6 mass % or less,
Cu: 0.1 mass % or less,
Mn: 0.05 mass % or less,
Mg: 0.05 mass % or less,
Zn: 0.1 mass % or less,
Ti: 0.1 mass % or less and 0.001 mass % or more, and
B: 6 ppm or less,
with the remainder consisting of Al and unavoidable impurities, and
wherein boron is present in the aluminum alloy material and is present in an amount of 6 ppm or less.

6. A pulse laser welding aluminum alloy material according to claim 1 , wherein the aluminum alloy has Ti of 0.004 mass % and B of 4 ppm.

7. A pulse laser welding aluminum alloy material according to claim 1 , wherein the aluminum alloy has Ti of 0.007 mass % and B of 5 ppm.

8. A pulse laser welding aluminum alloy material according to claim 1 , wherein the aluminum alloy has B of 4-6 ppm.

Assignees

• Matsumoto Tsuyoshi
• Kobayashi Kazunori
• Sasabe Seiji
• Kobe Steel Ltd

Inventors

• Matsumoto Tsuyoshi
• Kobayashi Kazunori
• Sasabe Seiji

Classifications

• C22C21/00 Primary

  Alloys based on aluminium · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M50/159

  Metals · CPC title

• H01M50/119

  Metals · CPC title

• H01M2/0426

  Electricity · mapped topic