A method for improving the surface roughness of rolled copper foil
A technology of surface roughness and rolled copper foil, which is applied in the field of metal material rolling, can solve the problems of low surface roughness, good surface quality of rolled copper foil, and the interface between copper foil and lithium foil is not easy to weld, etc., and achieve interface bonding. The effect of increasing strength and improving roughness
Active Publication Date: 2021-08-03
CENT SOUTH UNIV
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Problems solved by technology
However, in the rolling of copper / lithium composite materials, there is a relatively large disadvantage of rolled copper foil, that is, the surface quality of rolled copper foil is too good, and the surface roughness is very low, which makes the interface between copper foil and lithium foil difficult to weld
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[0016] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.
[0017] The invention discloses a method for improving the surface roughness of rolled copper foil, the main principle of which is to increase the appropriate roughness on the leveling roll, and perform cryogenic treatment on the leveling roll, so that the strength of the protruding part of the surface roughness of the leveling roll is greatly improved, At the same time, the elastic deformation of the raised parts is reduced, so that the roughness of the roll is mapped to the surface of the copper foil. And after the copper foil passes through the leveling roller, liquid carbon dioxide is sprayed on the surface of the copper foil to break the oxide film on the surface of the copper foil and further increase the roughness of the copper foil. Through this step, only the roughness of the copper foil is changed without changing the thickness of the c...
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Abstract
A method for improving the surface roughness of rolled copper foil. The rolled copper foil is used as a raw material, and it is put into a crimping machine; the leveling roll is turned on, and the surface roughness of the leveling roll is adjusted according to needs; Reduce the surface temperature of the roll to below ‑100°C; adjust the thickness of the roll gap to the thickness of the rolled copper foil raw material, and pass the rolled copper foil through the leveling roll; open the liquid carbon dioxide spray gun behind the leveling roll, and use liquid carbon dioxide to control the calendering of the leveling roll The surface layer of the copper foil is treated to increase the surface roughness of the rolled copper foil. The invention can increase the roughness without changing the thickness of the rolled copper foil whose surface roughness is too low, and further realize the increase of the interfacial bonding strength in the rolling process of the copper / lithium composite foil. The technology has industrial application prospects in the fields of copper foil and lithium batteries.
Description
technical field [0001] The invention belongs to the technical field of metal material rolling, in particular to a method for improving the surface roughness of rolled copper foil. Background technique [0002] With the continuous promotion of automobile lightweight and energy saving and emission reduction process, improving the cruising range and safety performance of new energy vehicles has become the key direction of technological innovation in the new energy automobile industry. For high-end lithium batteries, rolled copper foil is generally used as the negative electrode material. As a power battery current collector material, in addition to having an ultra-thin thickness, copper foil must also have good mechanical properties (strength, plasticity, etc.) and electrical properties (resistivity, conductivity, etc.) to ensure that the power battery has high energy density. and charging and discharging safety. [0003] Rolled copper foil has many advantages such as high st...
Claims
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IPC IPC(8): B21B1/40B21D1/02B21D37/16B21B45/00H01M4/66
CPCB21B1/40B21B45/00B21D1/02B21D37/16H01M4/66H01M4/661Y02E60/10
Inventor 喻海良雷刚崔晓辉
Owner CENT SOUTH UNIV