Weld cap A key step in the lithium battery production...
Cut
The slitting process in the production of lithium batteries is the process of cutting the coated, dried and rolled electrode sheet according to the design structure and specifications of the battery, which is crucial to the performance and quality of the battery. The following is a detailed introduction to the slitting process:
Purpose of the slitting process
The main purpose of slitter is to cut the wider pole sheet into the required width of a single cell according to the requirements of the battery design, so as to carry out the later winding or lamination of the cell.
Type of slitting process
Disc cutting: This is the most common way of cutting, the use of the upper and lower disc knife mounted on the cutter shaft, through the principle of rolling to cut the thickness of 0.01~0.1mm into rolls of aluminum foil, copper foil, positive and negative pole pieces, etc.
Die punching: divided into wood die punching and metal die punching, through the punch and the bottom die of the very small gap to cut the pole piece.
Laser cutting: The use of high power density laser beam to irradiate the cut battery electrode, so that the electrode quickly melted, vaporized, ablated or reached the ignition point to form a hole, to complete the cutting of the electrode.
Key parameters of slitting process
Lateral pressure and amount of overlap: These are the main adjustment parameters of the cutting part of the disc, which need to be adjusted in detail according to the nature and thickness of the pole plate.
Cutting edge wear state: cutting edge wear will affect the cutting quality, including the size of burr, the profile characteristics and the dimensional accuracy of the pole piece.
Influencing factors of slitting quality
Physical and mechanical properties of the material: the plasticity of the material is good, the crack will appear later in shear, and the proportion of the bright zone of the obtained section is large; Materials with poor plasticity are prone to fracture.
Upper and lower tool lateral pressure: in pole plate slitting, tool lateral pressure is one of the key factors affecting the slitting quality.
Major defects in the slitting process
Burrs: Metal burrs have great harm to lithium batteries, and larger metal burrs directly Pierce the diaphragm, resulting in short circuit between the positive and negative electrodes.
Wavy edge: Due to inappropriate overlap and pressure of the cutter, the wavy edge and notch coating will fall off, affecting the final thickness and morphology of the battery.
Powder drop: the powder drop will affect the battery performance, the battery capacity is reduced when the positive electrode drops powder, and the negative electrode can not wrap the positive electrode when the negative electrode drops powder, which is easy to cause lithium analysis.
Requirements for sliced pole slices
The pole sheet after the stripe can not be folded and dedusting, which requires high dimensional accuracy of the stripe, and small burr on the edge of the pole sheet to avoid dendrites punctured the diaphragm and caused short circuit inside the battery.
CONCLUSION
By precisely controlling the slitting process, the quality of the electrode sheet can be ensured, thereby improving the overall performance and safety of the battery.
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