Manufacturing method of positive aluminum foil material for pure aluminum-based battery tab

Abstract

The invention discloses a manufacturing method of a positive aluminum foil material for a pure aluminum-based battery tab, and belongs to the technical field of industrial high-purity aluminum. The method comprises the following steps: (1) hot rolling: performing hot rolling on a pure aluminum cast ingot after soaking treatment to obtain a hot-rolled coiled material with the thickness of 5-7mm; (2) carrying out 2-3 passes of cold rolling to obtain a hard cold-rolled coil of 2.0-3.5 mm; (3) intermediate annealing is conducted, specifically, the intermediate annealing temperature is controlled to be 400-450 DEG C, and the heat preservation time is 6-12 h; (4) performing cold rolling for 4-8 passes until the thickness is 0.1-0.4 mm to obtain a hard foil coil finished product; and (5) annealing the finished product to obtain a soft foil coil finished product with the thickness of 0.1-0.4 mm and the tensile strength of more than or equal to 80MPa. According to the method disclosed by the invention, the high-conductivity, high-bending and high-surface tab positive electrode aluminum strip material with excellent performance and high conductivity of 0.1 mm-0. 4mm is prepared.

Description

Technical field [0001] The invention involves the field of aluminum battery technology, which specifically involves a manufacturing method for a positive aluminum foil material for a pure aluminum battery pole ear. Background technique [0002] Elast -ears are a raw material for lithium ion polymer battery products for materials for power batteries and 3C battery conductive connections. For example, mobile phone batteries, Bluetooth batteries, laptop batteries, etc. used in life require pole ear. The battery is divided into positive and negative poles. The pole ear is the metal conductive body attracted from the positive and negative poles from the battery cell. In popular terms, the ears of the battery positive and negative are the contact points when charging and discharging. This contact point is not the copper piece of the battery we see, but a connection inside the battery. The pole ear is divided into three materials. The positive electrode of the battery uses aluminum (AL)...

AI Technical Summary

Problems solved by technology

Since the temperature of the electrolytic aluminum liquid is generally around 930°C, even if it is transferred to the foundry, the temperature will remain between 860 and 900°C. The raw and auxiliary materials used in the electrolysis of aluminum have a large water content, and the temperature of the aluminum liquid after electrolysis is high. , the gas content in the molten aluminum, especially the hydrogen content, is high, so the degassing process before casting and rolling is particularly important. Once the degassing is unfavorable, the gas content of the casting billet will exceed the standard requirement or cause pinholes in the subsequent processing sheet As the degree increases, the product failure rate increases, and even the size of the material design cannot be processed.

[0006] Although the casting-rolling process for producing aluminum foil is relatively perfect at present, which can reduce the production cost, due to the process characteristics of the casting-rolling process itself, the congenital process conditions lead to many defects such as inclusions in the cast-rolling sheet, and the surface of the product is very prone to pinholes, scratches, etc. Defects such as skin and component segregation cause unqualified products, which are not suitable for mid-to-high-end aluminum tab materials with high product quality requirements.

[0007] The tensile strength of aluminum foil products produced by hot rolling in the prior art is only 70-80MPa, which may affect the quality control of subsequent slitting processing

In addition, it has not made clear control and specific indicators for the electrolyte resistance and electrical conductivity that are crucial to the tab material.

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