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Aluminum alloy sheet for battery cases with excellent formability and weldability

A technology for battery shells and aluminum alloy plates, which can be applied to secondary batteries, battery pack components, circuits, etc. It can solve problems such as abnormal weld bead and laser welding problems, and achieve excellent formability, high thermal conductivity, and excellent laser welding. The effect of weldability

Inactive Publication Date: 2016-01-06
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it is known that aluminum alloy sheets based on 3000-series alloys and whose composition has been improved sometimes have abnormal weld beads, and there are problems in laser weldability.

Method used

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  • Aluminum alloy sheet for battery cases with excellent formability and weldability
  • Aluminum alloy sheet for battery cases with excellent formability and weldability
  • Aluminum alloy sheet for battery cases with excellent formability and weldability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0089] Fabrication of the final board

[0090] Weigh and combine various prescribed ingots, insert and fill ingots of 6 kg each (a total of 8 kinds of test materials) into the #20 crucible coated with a release agent. These crucibles were inserted into an electric furnace, and the dross was melted at 780°C. After that, the temperature of the melt was kept at 760°C, and 6 g of flux for deslagging was wrapped in aluminum foil and added by pressing with a phosphorizer.

[0091] Next, a lance (lance) was inserted into the melt, and N 2 gas was blown in at a flow rate of 1.0 L / min for 10 minutes to perform degassing treatment. Thereafter, sedation was carried out for 30 minutes, dross floating to the surface of the melt was removed with a stirring rod, and a disc sample was collected into a mold for component analysis with a sampling spoon.

[0092] Next, the crucibles were taken out from the electric furnace sequentially with a jig, and molten aluminum was poured into a preheated...

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Abstract

Provides a 1000-series aluminum alloy plate that has high strength suitable for large lithium-ion battery containers, has excellent formability, and is also excellent in laser weldability. Contains Si: 0.01 to 0.4% by mass, Fe: 0.01 to 0.5% by mass, Co: 0.003 to 0.5% by mass, the rest is composed of Al and unavoidable impurities, and the number of second phase particles having an equivalent circle diameter of 3 μm or more is less than 100 Aluminum alloy plate with a metal structure of / mm2. Its cold-rolled annealed sheet has an elongation value of 30% or more.

Description

technical field [0001] The present invention relates to a high-strength aluminum alloy plate excellent in formability and laser weldability used for containers for secondary batteries such as lithium ion batteries. Background technique [0002] Al—Mn-based 3000-series alloys are used as raw materials for manufacturing containers for secondary batteries such as lithium-ion batteries because they are relatively excellent in strength, formability, and laser weldability. After molding into the desired shape, it is sealed by laser welding and used as a container for secondary batteries. Along with the above-mentioned 3000-series alloys, the development of aluminum alloy plates for secondary battery containers with further improved strength and formability based on the existing 3000-series alloys has also begun. [0003] For example, Patent Document 1 describes an aluminum alloy plate for a battery container with a rectangular cross-section that contains, as the composition of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C21/02H01M2/02H01M50/119H01M50/131
CPCH01M10/0525C22F1/043Y02E60/10H01M50/131H01M50/119C22C21/00C22C21/02
Inventor 铃木健太堀久司金森圭治
Owner NIPPON LIGHT METAL CO LTD