Abstract
Lithium-ion batteries have a higher energy density than other secondary batteries. Among the lithium-ion battery manufacturing process, electrode cutting is one of the most important processes since poor cut quality leads to performance degradation, separator protrusion, and local electric stress concentration. This may, eventually, lead to malfunction of lithium-ion batteries or explosion. The current mechanical cutting technology uses a contact process and this may lead to process instability. Furthermore, there are additional costs if the tools and cell design are changed. To solve these issues, laser cutting has been used. Conventional dependent parameters have limitations in investigating and explaining many physical phenomena during the laser cutting of electrodes. Therefore, this study proposes specific widths such as melting, top, and kerf width. Moreover, the relationship between laser parameters and multiphysical phenomena with the proposed widths are investigated. Five types of classification with regard to physical phenomena are presented and explained with SEM images. Cutting efficiency is estimated with the proposed widths. The proposed specific cutting widths, five types of geometrical classification, and cutting efficiency can be used as standardized parameters to evaluate the cutting quality.
Highlights
Lithium-ion batteries, which are secondary rechargeable batteries, have a higher energy density than other secondary batteries such as Ni–Cd batteries and Pd batteries if compared under the same conditions
When the body of the graphite reaches the sublimation temperature, the graphite is sublimated and the mass is removed. These heat transfer and material removal mechanisms are observable by investigating the top width
This study proposed specific widths such as melting width and top width the electrode and full ablation of the active electrode material are observed
Summary
Lithium-ion batteries, which are secondary rechargeable batteries, have a higher energy density than other secondary batteries such as Ni–Cd batteries and Pd batteries if compared under the same conditions. The lithium-ion manufacturing process can be categorized into two parts: (1) electrode coating and (2) cell assembly [2] During this manufacturing process, electrode cutting is one of the most important processes since poor cut quality leads to performance degradation. Electrode cutting is one of the most important processes since poor cut quality leads to performance degradation Defects such as burr and dross result in separator protrusion and local electric stress concentration. This may, eventually, lead to malfunction of lithium-ion batteries or explosion [3]. Die cutting or rotary knife cutting is used to cut electrodes Since this process is a contact process, tools can be worn out and process instability can be observed with high possibility. The lack of a standardized battery cell design leads to frequent changes in manufacturing specification, whenever the cell design is changed
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