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Al-Fe alloy plate for shell of power battery and preparation method thereof

A power battery and alloy plate technology, which is applied in the field of aluminum alloy processing, can solve problems such as porosity, increased penetration depth, shell mouth and plane deformation, etc., and achieve the effects of improved absorption rate, good mechanical properties, and good stamping performance

Active Publication Date: 2013-03-20
CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned alloys have certain problems: (1) The material is relatively soft, and it is easy to cause shell mouth and plane deformation after being impacted or squeezed by external forces during packaging and transportation; (2) Laser welding is prone to pores and poor air leakage quality higher rate
While the high energy density laser increases the penetration depth, it will also bring adverse effects, that is, the uniformity of the weld pool will decrease
In addition, in order to improve the strength of aluminum alloy, the addition of strengthening alloy elements will also be detrimental to the laser welding performance of the alloy

Method used

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  • Al-Fe alloy plate for shell of power battery and preparation method thereof
  • Al-Fe alloy plate for shell of power battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Alloy 1 given in Table 1 is melted and cast # , the alloy ingot was heated from room temperature to 580°C at a heating rate of 50°C / h and kept for 2 hours, then cooled to 490°C at a rate of 50°C / h and held for 2 hours, and then hot-rolled; then the hot-rolled plate was cold-rolled To a thickness of 1.3 mm, heat the cold-rolled sheet at a rate of 30°C / h to 380°C for 1 hour and then air-cool to finally obtain the required sheet.

Embodiment 2

[0031] Alloy 2 given in Table 1 is melted and cast # , the alloy ingot was heated from room temperature to 560°C at a heating rate of 60°C / h and kept at a temperature of 4h, then cooled at a rate of 60°C / h to 450°C and kept at a temperature of 2h, and then hot rolled; then the hot rolled plate was cold rolled To a thickness of 1.3 mm, the temperature of the cold-rolled sheet is raised to 350°C at a rate of 30°C / h for 2 hours, and then air-cooled to finally obtain the required sheet.

Embodiment 3

[0033] Alloy 3 given in Table 1 was melted and cast # , the alloy ingot was heated from room temperature to 590°C at a heating rate of 40°C / h and kept for 1h, then cooled to 480°C at a rate of 40°C / h and held for 2h, and then hot-rolled; then the hot-rolled plate was cold-rolled To a thickness of 1.3 mm, heat the cold-rolled sheet at a rate of 30°C / h to 380°C for 1 hour and then air-cool to finally obtain the required sheet. The temperature of the cold-rolled sheet is raised to 420°C at a rate of 30°C / h for 1 hour, and then air-cooled to finally obtain the required sheet.

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Abstract

The invention provides an Al-Fe alloy plate for a shell of a power battery and a preparation method thereof. The Al-Fe alloy plate comprises the following components in percentage by mass: 0.9-1.6 percent of Fe, 0.08-0.2 percent of Si and the balance of Al and inevitable impurities, wherein the area ratio of a Fe-containing inter-metallic compound with the internal alloy length of more than 1 mu m is over 5 percent in the plate thickness direction. The preparation method comprises the following steps of: casting a cast ingot, raising the temperature of the cast alloy cast ingot to 560-600 DEG C, keeping the temperature for more than one hour, reducing the temperature to 450-520 DEG C, keeping the temperature for more than two hours, and performing hot rolling; and performing cold rolling on the hot-rolled plate to the required thickness, annealing the obtained cold-rolled plate at the temperature of 350-420 DEG C for more than one hour, and performing air cooling after the plate is annealed, wherein the speed is not more than 100 DEG C per hour during temperature rise or reduction. The alloy plate has excellent mechanical property, pulse laser welding performance and forming property, and the requirements of manufacturing the shell of the power battery are met.

Description

technical field [0001] The invention relates to an aluminum alloy and a preparation method thereof, in particular to an Al-Fe alloy plate for an electric vehicle lithium-ion power battery casing and a preparation method thereof, and belongs to the technical field of aluminum alloy processing. Background technique [0002] The State Council pointed out in the energy-saving and new energy vehicle industry development plan (2012-2020) that pure electric drive is the main strategic orientation for the development of new energy vehicles and the transformation of the automobile industry, and the current focus is on promoting the industry of pure electric vehicles and plug-in hybrid vehicles change. By 2015, the cumulative production and sales of pure electric vehicles and plug-in hybrid vehicles will reach 500,000; by 2020, the production capacity of pure electric vehicles and plug-in hybrid vehicles will reach 2 million, and the cumulative production and sales will exceed 5 milli...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22F1/04C21D8/02
Inventor 潘琰峰赵丕植江涛石相军
Owner CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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