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Aluminum alloy plate for battery case and battery case

A technology of battery casing and aluminum alloy plate, which is applied in the direction of battery cover/end cover, battery pack components, battery box/jacket, etc., can solve the problems of reduced formability, prone to cracks, high yield strength, etc. Excellent weldability, secure penetration depth, and the effect of sufficient penetration depth

Inactive Publication Date: 2013-04-17
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason why the strength is increased at the stage of the material plate is to manufacture a high-strength battery case from a non-heat-treated Al-Mn-based aluminum alloy plate. The problem that cracks are prone to occur during the forming process into the battery case

Method used

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  • Aluminum alloy plate for battery case and battery case
  • Aluminum alloy plate for battery case and battery case
  • Aluminum alloy plate for battery case and battery case

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Hereinafter, examples in which the effects of the present invention were confirmed are compared with comparative examples in which the requirements of the present invention are not satisfied, and will be specifically described.

[0057] 〔Production of test materials〕

[0058] Aluminum alloys having the compositions shown in Table 1 were melted and cast to form ingots, and after end milling the ingots, homogenization heat treatment was performed at 550° C. for 4 hours. The homogenized ingot was hot-rolled and then cold-rolled to obtain an aluminum alloy plate with a plate thickness of 1.0 mm. The cold-rolled rolled sheet was heated to 370° C., and batch-type annealed at this temperature for 4 hours was used as a sheet material (O material) for characteristic evaluation.

[0059] [Table 1]

[0060]

[0061] Using the evaluation sheets of Examples 1 to 14 and Comparative Examples 1 to 14, yield strength measurement, formability test, and weldability test (welding appe...

Embodiment 2

[0080] The aluminum alloy of Example 2 in Table 1 was melted and cast to form an ingot, and after face milling the ingot, a homogenization heat treatment was performed at 550° C. for 4 hours. The homogenized ingot was subjected to hot rolling and cold rolling, and after intermediate annealing held at 500° C. for 60 seconds, cold rolling was performed at 30% (Comparative Example 15) or 50% (Comparative Example 16). An aluminum alloy plate with a plate thickness of 1.0 mm was used as a plate material (H material) for property evaluation. Using the evaluation plates of Comparative Examples 15 and 16, the same evaluation test as [Example 1] was performed. The results are shown in Table 3.

[0081] 【table 3】

[0082]

[0083] As shown in Table 3, in Examples 15 and 16, the yield strength of the evaluation plate (H material) was high and the formability was poor.

Embodiment 3

[0085] From the evaluation plate (O material) of Example 2 of Table 1, cut out the test piece of 30mm * 100mm size, use the YAG laser of pulse sending, maximum peak output power 4.5kW, frequency 10Hz, the energy of every 1 pulse ( Radial energy) was 25 J / p, and a weldability test by pulsed laser welding (surfacing welding same as the weldability test of [Example 1]) was performed.

[0086]As a result, the weld penetration depth was 0.28 mm on average, which was significantly insufficient compared with 0.4 to 0.5 mm in [Example 1].

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Abstract

The subject of the invention aims to provided an aluminum alloy plate for a battery case which has excellent forming property and excellent welding performance and can ensure case intensity after forming. The aluminum alloy plate for a battery case comprises 0.5-1.5 mass % of Mn, 0.2-1.5 mass% of Mg, 0.1-1.0 mass% of Cu and residual composed of A1 and inevitable impurities and is an O material (annealing material) with a yield strength value of 40-100 MPa. The aluminum alloy plate performs welding with a cover material through continuous oscillation laser. The aluminum alloy, as an addition element or inevitable impurity, may comprise less than 0.6 mass% of Si, less than 0.8% of Fe, less than 0.02% of Ti, less than 20 mass pp m of B, less than 0.15 mass % of Zr, less than 0.40 mass % of Cr and less than 0.3 mass % of Zn.

Description

technical field [0001] The present invention relates to an aluminum alloy plate for a battery case and a battery case used for lithium ion secondary battery cases and the like. Background technique [0002] Lithium-ion secondary batteries are widely used as power sources for mobile phones, notebook personal computers, and the like. Among the materials for the case of the secondary battery (hereinafter referred to as the battery case as appropriate), conventionally, for the sake of miniaturization and weight reduction of the battery, and in order to meet the requirements for forming the battery case (mainly the main body of the battery case) ) processability (formability), etc. and use aluminum alloy materials. As aluminum alloys for such battery cases, JIS 1000 and 3000-series aluminum alloys have conventionally been widely used. [0003] In Patent Document 1, a 3000-series (Al-Mn-based) aluminum alloy is subjected to homogenization treatment, followed by hot rolling, cold...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/08H01M2/02B23K26/21C22C21/06C22F1/00C22F1/04
CPCY02E60/10C22C21/06H01M50/591H01M50/119C22F1/047
Inventor 小林一德松本刚
Owner KOBE STEEL LTD
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