Burr

Example

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Place operations and quality checks in process order.

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Internal short circuit

An unintended electronic path between the electrodes inside a cell — through a metal particle, a burr, a damaged separator or lithium deposits. It discharges the cell internally and turns its energy into local heat.

Laser cutting

Cutting electrodes with a pulsed laser instead of a die, used for notching and for separating sheets. It changes shape without a new tool, at the cost of a heat-affected zone that must be kept small.

Notching

Cutting the tab shape and the electrode sheet outline from the slit strip, mechanically or by laser, before stacking. Laser notching has no tool wear but must avoid heat damage at the edge.

Separator

A porous, electronically insulating film between the electrodes. Electrons cannot cross it; ions move through the electrolyte in its pores.

Slitting

Cutting the wide coated roll into the narrow strips a cell needs, with rotary knives. A clean edge matters: burrs can pierce the separator and cause an internal short.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. Current and future lithium-ion battery manufacturing

   Yangtao Liu, Ruihan Zhang, Jun Wang, Yan Wang · iScience · 2021

   Topic background · Electrode preparation, cell assembly, formation and manufacturing trade-offs.