Laser Processing on Power Batteries Application Note

The demand for power batteries is growing fast with the rapid development of new energy vehicles. The shape of the electric battery cells is divided into cylindrical, soft pack, and square cells. The shell material is mainly made of aluminium and stainless steel, of which rectangular and aluminium are the primary materials.

Operation Principle & Application

1. Laser Cutting on the Pole Ear

There are four types of battery materials:

1) NiMH Batteries

2) Fuel Battery

3) Lead-Acid Batteries

4) Lithium Electronic Batteries.

The production of lithium batteries is a “roll-to-roll” process, whether it is lithium iron phosphate, sodium ion, or ternary batteries, all of them need to go through the process from thin film to individual battery, and then be mounted into a battery system. The lithium battery production process includes electrode production, battery cell assembly, and packaging.

Lithium batteries are mainly composed of positive electrodes, negative electrodes, diaphragms, electrolytes, and battery casings. A laser is used to cut and form positive and negative electrodes.

2. Laser Cleaning on Foil

The positive and negative electrodes of lithium batteries are made by coating with aluminum and copper foil, The foil needs to be cleaned before coating to obtain a completely clean and oxide-free surface.

3. Laser Welding on Power Battery

The laser welding process on power batteries includes welding, leak detection, short circuit detection, and coding and marking. Different Pulsed lasers will be used for welding according to battery material, thickness, and shape.

Scan welding system consists of a collimator, scanner, scan lens, objective lens, CCD, dichroic mirror, connecting plate and air knife, etc.

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