What are the assembly steps for a lithium-ion battery?

Assembly steps show: with cylindrical battery as an example the battery the same basic process (squares)., before aluminum strip winding core into the cylinder (0.08-0.15 ㎜ thick, 3 ㎜) and nickel (0.04-0.10 ㎜ thick, wide 3 ㎜) with ultrasonic welding in the designated place of positive and negative electrode conductive substrate as current collector extremely.

PE/PP2 commonly used battery diaphragm or PP/PE/PP3 layer of the diaphragm is after 120 ℃ heat treatment, in order to increase its prevent and improve its security.

The positive, diaphragm, negative 3 after composite winding into the cylinder, because use paste electrode, therefore, must make the paste and matrix with good material, to form a high-density electrode, especially to prevent off powder, lest its membrane caused by battery internal short circuit.

Before winding batteries inserted steel cylinder, put an insulating base into the bottom of the cylinder is to prevent internal short circuit the battery for general battery is the same.

Electrolytes generally USES LiPF6 and non-aqueous organic solvent, before the vacuum filler, the battery to vacuum drying / 24 h, to remove the battery components in water and moisture, in order to avoid LiPF6 react with water to form a HF and shortens life.

Battery sealing by the sealing glue, insert the gasket, edge and area reduction process, the basic principle is the same as the alkaline rechargeable batteries.After sealing, the battery with isopropyl alcohol and water mixture to remove dirt and oil spills of electrolyte, and then drying.Use a kind of smell sensor or "sniffer" element to check battery leakage.

The battery assembly is complete, with X-ray appraisal battery internal structure is normal, for batteries is not straight, steel shell crack, solder joints, check for short circuit, etc, to eliminate the defective battery, ensure the quality of the battery.

The procedure is into, first rechargeable batteries, protective film is formed on the anode, known as the solid electrolyte interphase (SEI) layer, it can prevent the anode reaction with electrolyte, and is the battery safe operation, high capacity, long life of the key elements.Batteries after a few charge and discharge cycle 2-3 weeks after Chen, remove the micro short circuit batteries, and then to capacity after sorting packaging becomes a commodity.

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