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Battery-case aluminium alloy plate exhibiting excellent moulding properties, heat-dissipation properties, and welding properties

A battery case and aluminum alloy plate technology, applied in the field of aluminum alloy plates, can solve problems such as low strength, and achieve the effects of excellent formability, excellent laser weldability, and excellent shape freezing.

Inactive Publication Date: 2015-08-12
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Indeed, although the 1000 series has stable weldability and excellent formability, it has the problem of low strength

Method used

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  • Battery-case aluminium alloy plate exhibiting excellent moulding properties, heat-dissipation properties, and welding properties
  • Battery-case aluminium alloy plate exhibiting excellent moulding properties, heat-dissipation properties, and welding properties
  • Battery-case aluminium alloy plate exhibiting excellent moulding properties, heat-dissipation properties, and welding properties

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Experimental program
Comparison scheme
Effect test

Embodiment

[0096] Fabrication of the final board

[0097] Various predetermined ingots were measured and blended, and 6 kg of ingots (a total of 8 test materials) were inserted into each No. 20 crucible coated with a release material. Insert these crucibles into the electric furnace, melt at 780°C to remove dross, then keep the temperature of the melt at 740°C, then insert a small spray gun into the melt, and inject N at a flow rate of 1.0L / min. 2 The gas was degassed for 10 minutes. Then, it was left to rest for 30 minutes, and the dross floating on the surface of the melt was removed with a stirring rod, and the disc sample was taken into a mold for component analysis with a sample spoon.

[0098] Next, the crucibles were sequentially taken out of the electric furnace using jigs, and the molten aluminum was cast into a water-cooled mold with an inner size of 200 mm×200 mm×16 mm to produce a thin plate. The composition of the disk samples of each test material was analyzed by lumine...

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Abstract

Provided is a 3000 series aluminium alloy plate which exhibits heat-dissipation characteristics applicable to large lithium ion battery containers, and which also exhibits excellent moulding properties, shape fixability, and laser welding properties. This aluminium alloy plate is a cold-rolled annealed material which has: a component composition including over 0.2 mass% but less than 1.4 mass% of Fe, 0.5-2.0 mass% of Mn, over 0.2 mass% but not more than 1.1 mass% of Si, 0.05-1.0 mass% of Cu, and less than 0.05 mass% of Mg, the remainder comprising Al and impurities; a conductivity of over 45% IACS; a metallographic structure in which the number of second phase particles having an equivalent circular diameter of at least 2 µm is less than 1800 / mm2; a 0.2% proof stress of at least 30 MPa but less than 85 MPa; and an elongation value of at least 10%. Otherwise, this aluminium alloy plate is a cold-rolled material which has: a conductivity of over 45% IACS; a metallographic structure in which the number of second phase particles having an equivalent circular diameter of at least 2 µm is less than 1800 / mm2; a 0.2% proof stress of at least 90 MPa but less than 180 MPa; and an elongation value of at least 3%.

Description

technical field [0001] The present invention relates to an aluminum alloy plate excellent in formability, heat dissipation and weldability for use in containers for secondary batteries such as lithium ion batteries. Background technique [0002] Al—Mn-based 3000-series alloys are increasingly 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 a desired shape, it is sealed by laser welding and used as a container for a secondary battery. Based on the above-mentioned 3000-series alloys and existing 3000-series alloys, an aluminum alloy plate for secondary battery containers with improved strength and formability has been further developed. [0003] For example, Patent Document 1 describes an aluminum alloy plate for a prismatic battery case that has a composition specified in JIS A3003 as the composition of the aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00B21B3/00C22F1/04H01M2/02B22D11/06C22F1/00H01M50/119H01M50/131
CPCB21B3/00H01M10/6554H01M10/613H01M2/0285C22C21/00B22D11/06H01M10/0525C22F1/04Y02E60/10H01M50/119H01M50/131
Inventor 铃木健太大和田安志穴见敏也水嶋一光
Owner NIPPON LIGHT METAL CO LTD
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