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Aluminum alloy for power battery case and processing method thereof

A technology of power battery and processing method, applied in battery box/jacket, battery pack components, battery box/cover material, etc., can solve problems such as easy splashing, limited use range, and reduced strength performance

Inactive Publication Date: 2017-11-28
杨仲彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This alloy usually has better deep drawing, welding and strength, but there are still some problems: poor quality is prone to occur during laser welding, such as pores and air leakage; when the depth of the welding pool is too large (such as exceeding 0.3mm), the welding pool Poor uniformity, easy to splash, seriously affecting the sealing of the casing and the safety performance of the battery
However, as the battery capacity increases and the shell wall thickness increases, the depth of the molten pool will inevitably increase; there is an interaction between deep drawing, welding and strength, and if the strength is increased, the deep drawing performance may be reduced
CN103409668A discloses an Al-Mn alloy for a power battery casing, which restricts the composition and microstructure of the Al-Mn alloy and has good welding performance, but the mechanical properties of the material are low; CN101910434A discloses a power battery The battery shell is made of 1-series aluminum alloy, but the mechanical properties of this material are too low, and the scope of application will be greatly limited; Patent CN102206775A invented an aluminum alloy used for power battery shells. In order to improve the welding performance of the material, the invention reduce the strength properties of the material

Method used

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  • Aluminum alloy for power battery case and processing method thereof
  • Aluminum alloy for power battery case and processing method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] The aluminum alloy for the casing of the power battery in this embodiment is prepared from the following components by weight percentage:

[0036] Mn 1.2 wt.%, Cu 0.2 wt.%, Fe 0.25 wt.%, Si 0.15 wt.%, Mg 0.16 wt.%, Zr 0.01 wt.%, Ti 0.03 wt.%, the balance is Al and unavoidable impurities, and the Mg / Si mass ratio is 0.9~1.1.

[0037] The aluminum alloy for the casing of the power battery in this embodiment is prepared by the following processing method, including steps:

[0038] S1. Carry out homogenization annealing to the cast ingot with the same composition as the aluminum alloy for the above-mentioned power battery casing. The annealing treatment includes the steps of: rising to 420 °C at a speed of 63 °C / h for 5 hours, and then heating at the same rate Rate rises to 620 ° C and is incubated for 9 hours;

[0039] S2. then drop to 500 °C at a speed lower than 100 °C / hour for hot rolling to obtain a hot rolled plate;

[0040] S3. cold-rolling the hot-rolled plate to...

Embodiment 2

[0043] The aluminum alloy used for the casing of the power battery in this embodiment has the following constituent elements in terms of weight percentage:

[0044] Mn 1.4 wt.%, Cu 0.12 wt.%, Fe 0.23 wt.%, Si 0.11 wt.%, Mg 0.12 wt.%, Zr 0.10 wt.%, Ti 0.02 wt.%, the balance is Al.

[0045] The aluminum alloy for the casing of the power battery in this embodiment is prepared by the following processing method, including steps:

[0046] S1. Carry out homogenization annealing to the cast ingot with the same composition as the aluminum alloy for the above-mentioned power battery casing. The annealing step includes: rising to 440 °C at a speed of 80 °C / h for 4 hours, and then at the same heating rate Rise to 590 ° C and keep warm for 10 hours;

[0047] S2. then drop to 540 °C at a speed lower than 100 °C / hour for hot rolling to obtain a hot-rolled plate;

[0048] S3. cold-rolling the hot-rolled plate to obtain a cold-rolled plate;

[0049] S4. the cold-rolled plate is incubated a...

Embodiment 3

[0051] The aluminum alloy used for the casing of the power battery in this embodiment has the following constituent elements in terms of weight percentage:

[0052] Mn 1.8 wt.%, Cu 0.25 wt.%, Fe 0.3 wt.%, Si 0.05 wt.%, Mg 0.05 wt.%, Zr 0.05 wt.%, Ti 0.10 wt.%, the balance is Al.

[0053] The aluminum alloy for the casing of the power battery in this embodiment is prepared by the following processing method, including steps:

[0054] S1. Carry out homogenization annealing to the cast ingot with the same composition as the aluminum alloy for the above-mentioned power battery casing. The annealing step includes: rising to 400 °C at a speed of 40 °C / h for 8 hours, and then at the same heating rate Rise to 640 ° C and keep warm for 8 hours;

[0055] S2. then drop to 500 °C at a speed lower than 100 °C / hour for hot rolling to obtain a hot rolled plate;

[0056] S3. cold-rolling the hot-rolled plate to obtain a cold-rolled plate;

[0057] S4. the cold-rolled plate was incubated at...

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Abstract

The invention discloses aluminum alloy for a power battery case and a processing method thereof. The aluminum alloy for the power battery case is prepared from the following ingredients in percentage by weight: 1.1 to 1.8 weight percent of Mn, 0.05 to 0.25 weight percent of Cu, 0.1 to 0.3 weight percent of Fe, 0.05 to 0.2 weight percent of Si, 0.05 to 0.2 weight percent of Mg, 0.01 to 0.10 weight percent of Zr, at most 0.10 weight percent of Ti and the balance of Al and unavoidable impurities. The aluminum alloy for the power battery case according to the embodiment has the advantages that through the optimization of composition ingredients and process, the welding intensity and the forming performance of the material are improved; the aluminum alloy is applicable to the power battery case.

Description

technical field [0001] The invention relates to the field of metal and metal processing, in particular to an aluminum alloy for a power battery casing and a processing method thereof. Background technique [0002] With the reduction of oil resources and the increase of car ownership, the environmental pollution is intensified, and the advantages of new energy vehicles are becoming more and more obvious. Not only that, the national industrial policy also strongly supports the development of the new energy vehicle industry. Therefore, the new energy vehicle industry has entered a period of rapid development. Generally, the aluminum alloy used to manufacture the key components of new energy vehicles - the power battery shell is 3003 aluminum alloy. This alloy usually has better deep drawing, welding and strength, but there are still some problems: poor quality is prone to occur during laser welding, such as pores and air leakage; when the depth of the welding pool is too larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04H01M2/02H01M50/116
CPCC22C21/00C22F1/04H01M50/116Y02E60/10
Inventor 杨仲彬
Owner 杨仲彬
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