Sheet metal of multi-layer structure

Abstract

The invention discloses a sheet metal of a multi-layer structure. The sheet metal is characterized by comprising four layers of metal layers which are parallelly distributed, the two outermost layers are made of nickel, the sum of the thicknesses of the two outermost layers does not exceed 30% of the total thickness of the sheet metal, and the two middle layers are made of stainless steel, copper or copper alloy and low-carbon steel according to a certain proportion.

Description

technical field [0001] The invention relates to a metal sheet with a multi-layer structure, which can save and replace existing batteries used in nickel-cadmium, nickel-hydrogen, lithium-ion, lithium polymer, combined batteries and other industries, as well as electric tools, information communication, special lamps and other industries. A large number of pure nickel strip, foil and sheet materials are used. The invention belongs to the technical field of metal matrix composite materials. Background technique [0002] At present, in the fields of nickel cadmium, nickel metal hydride, lithium ion, lithium polymer, combined battery and other batteries, the internal tabs, the connecting pieces of the battery pack and the pins of the PTC overcurrent protection components, as well as the electric tools, information communication, special lamps, etc. In industries such as vacuum components, a large number of pure nickel strips, foils, and sheets are required. The above specific ...

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Problems solved by technology

[0006] 1) In the necessary electroplating or electroless plating manufacturing process, it is necessary to use and discharge a large amount of chemical substances such as acid and alkali, which seriously pollutes the environment. Even if the discharge treatment is adopted, the production cost will be indirectly increased

[0007] 2) The thickness of the nickel layer of nickel-plated materials is generally between 0.3 and 6 μm, and the thicker the nickel-plated layer and the substrate, the weaker the bonding strength will be, and the surface layer has a certain porosity (at least 2%). The nickel-coated layer is easy to peel off (for example, when it needs to be bent and formed during processing or where sliding friction is required in the working state), it is more likely to corrode the substrate

Because the base layer of nickel-plated steel strip is low-carbon steel (lower conductivity than pure nickel), the resistivity of the overall material is more than 40% higher than that of pure nickel, and the resistivity of nickel-plated stainless steel is 6 times higher than pure nickel for the same reason. All of the above have greatly increased the internal resistance of the battery, which is not conducive to improving the battery capacity and service life; although the resistivity of nickel-plated copper strips is lower than that of pure nickel strips, the overall strength of the material is far inferior to that of pure nickel strips because the substrate is copper. , which limits the material's use in many applications that require strength

[0009] The economical pure nickel composite metal material prepared by the rolling composite method that has been practically applied at present has only three layers of composite metal Ni / Cu / Ni, and still has the strength performance problem of the nickel-plated copper strip mentioned in the above 3)

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