About Battery aluminum foil

Current collectors for lithium-ion batteries

Battery aluminum foil is used as a current collector for lithium-ion batteries.Typically,the lithium-ion battery industry uses rolled aluminum foil as the positive electrode current collector.

Basic introduction: 

Rolled foils vary in thickness from 10 to 50 microns.The commonly used pure aluminum foil for lithium batteries has various alloy grades such as 1060,1050, 1145,and 1235, and has states such as -O, H14, -H24, -H22, and -H18.

Location indication:

Lithium batteries generally come in two shapes:cylindrical and square.The interior of the battery adopts a spiral wound structure, and the positive and negative electrodes are separated by an extremely thin and highly breathable polyethylene film.The positive electrode includes a current collector composed of lithium cobalt oxide (or lithium nickel cobalt manganate, lithium manganate, lithium iron phosphate, etc.) and aluminum foil.The negative electrode consists of a graphitized carbon material and a current collector composed of copper foil.The battery is filled with organic electrolyte, and is also equipped with a safety valve and PTC elements (some are cylindrical) to protect the battery from being damaged when it is in an abnormal state or the output is short-circuited..

Quality requirements:

1.The surface of the aluminum foil is uniform in color, smooth and flat in shape, without obvious roll marks, pitting, pinholes, and corrosion marks;

2.There are no rolling defects such as creases, spots, and bright lines on the surface of the aluminum foil;

3.There is no color difference on the surface of aluminum foil;

4.There is no oil stain on the surface, no serious oily smell, and no visible oil spots;

The fifth surface tension, the dyne pen test is not less than 32 dyne;

Appearance requirements:

1.The winding tightness of aluminum foil is moderate, the end surface is flat and clean, and the edge is smooth;

2.The misalignment of the aluminum foil roll shall not exceed ±1.0mm;

3.The width of the aluminum foil core is greater than or equal to the foil width, and the length of both ends of the tube core generally does not exceed 5mm of the foil width,Fourth, the aluminum foil should be wrapped around the center of the mold;

5.There are obvious seam marks at both ends of the aluminum coil at the seam.

Battery Grade Aluminum Foil:

On the basis of fully considering the thermal conductivity, electrical conductivity and mechanical strength of aluminum foil, special blanks are used, and it is manufactured in a clean and dust-free workshop environment through online profile rolls of high-precision imported rolling mills. Siemens control system.

Feature:

1.The aluminum foil rolling mill equipment is equipped with advanced thickness automatic control system and plate shape automatic control system to realize precise control of plate shape and thickness;

2.Select aluminum foil blanks, strictly control the hydrogen content of the blanks, the amount of non-metallic slag inclusions and grain size, and ensure product quality from raw materials;

3.Adopt advanced online degreasing technology to ensure the cleanliness of the aluminum foil on the basis of ensuring the mechanical strength of the aluminum foil.