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Preparation method of aluminum alloy for battery shell

A technology of aluminum alloy and battery shell, applied in the field of aluminum alloy, can solve the problems of large grain size, excessive hydrogen content, and difficulty in guaranteeing, and achieve the effect of guaranteeing grain size

Pending Publication Date: 2022-07-22
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extremely high requirements on the comprehensive performance of the material, the battery case requires excellent comprehensive machining performance, good corrosion resistance and welding performance, and has very high requirements on the purity of the melt, the control of chemical composition content, and the quality consistency of the ingot. The ingots prepared by the current production method are prone to defects such as chemical composition, excessive hydrogen content and large grain size, which seriously affect the quality of ingot products and supply guarantee.
However, the existing aluminum alloy melting and casting technology for aluminum alloys for battery shells is difficult to meet this requirement.

Method used

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Effect test

preparation example Construction

[0025] In view of the performance requirements of aluminum alloys for batteries, the present invention provides a method for preparing aluminum alloy ingots for battery shells. The method can stably control the chemical composition, make the hydrogen content ≤0.15ml / 100gAl and the grain size 1.5, satisfying The battery shell has excellent formability, corrosion resistance and welding performance requirements. Specifically, the embodiment of the present invention discloses a method for preparing an aluminum alloy for a battery case, which includes the following steps:

[0026] A) Carry out batching according to the composition of the aluminum alloy, and take samples for analysis after melting;

[0027] B) adding granular refining agent to the melt obtained in step A) and refining to obtain melt;

[0028] C) carrying out on-line degassing, on-line filtration and on-line refinement of the melt successively;

[0029] D) casting the melt obtained in step C);

[0030] The composi...

Embodiment 1

[0042] The aluminum alloy is prepared according to the following method: batching, smelting, composition adjustment, furnace purification, on-line purification, casting, sawing, and testing are carried out in sequence;

[0043] Batching process: batching is carried out according to the alloy composition and technical requirements; no waste is used during batching, and the aluminum ingots are made of low-Zn content grade aluminum ingots;

[0044] Smelting process: sample and analyze the alloy raw materials after melting; the melting temperature in the furnace is 720-760 ℃;

[0045] Composition adjustment: Compare the actual analysis results of the chemical composition before the furnace with the pre-obtained target value. If the element content is lower than the target value, add a certain element of pure metal or an intermediate alloy containing the element until the element reaches the target value. If the element content If it exceeds the target value, add aluminum ingots to t...

Embodiment 2

[0057] The aluminum alloy is prepared according to the following method: batching, smelting, composition adjustment, furnace purification, on-line purification, casting, sawing, and testing are carried out in sequence;

[0058] Batching process: batching is carried out according to the alloy composition and technical requirements; no waste is used during batching, and the aluminum ingots are made of low-Zn content grade aluminum ingots;

[0059] Smelting process: sample and analyze the alloy raw materials after melting; the melting temperature in the furnace is 720-760 ℃;

[0060] Composition adjustment: Compare the actual analysis results of the chemical composition before the furnace with the pre-obtained target value. If the element content is lower than the target value, add a certain element of pure metal or an intermediate alloy containing the element until the element reaches the target value. If the element content If the target value is exceeded, aluminum ingots are a...

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PUM

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Abstract

The invention provides a preparation method of an aluminum alloy for a battery case, which comprises the following steps: A) burdening according to the components of the aluminum alloy, and sampling and analyzing after melting; b) adding a granular refining agent into the melt obtained in the step A) for refining to obtain a melt; c) sequentially carrying out on-line degassing, on-line filtering and on-line refining on the melt; and D) casting the melt obtained in the step C). According to the preparation method of the aluminum alloy for the battery shell, the chemical components can be controlled, the hydrogen content is smaller than or equal to 0.15 ml / 100 gAl, the grain size is 1.5 level, and the performance requirements for excellent formability, corrosion resistance, welding and the like of the battery shell are met.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a preparation method of an aluminum alloy for battery shells. Background technique [0002] New energy vehicles have effectively alleviated the pollution problems of traditional fuel vehicles and eased the dilemma of the increasing scarcity of oil resources. In order to increase the cruising range, new energy electric vehicles need a large number of lithium battery combination modules. Quality has a big impact. Therefore, the use of aluminum alloy as the material to make the battery casing has become an inevitable choice for power battery packaging. [0003] The aluminum alloy power battery shell has a low density, and it is also better to increase the volume, safety performance and stability of the lithium battery. The battery case is formed by stamping and must have good deep drawing performance, and the mechanical properties must be stable within a strict range. In ...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06C22C21/00B22D1/00C22B9/05C22B21/06
CPCC22C1/026C22C21/00C22C1/03C22C1/06B22D1/002B22D1/00C22B9/055C22B21/066
Inventor 史贵山王明博吴好文封洪兵
Owner SOUTHWEST ALUMINUM GRP
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