Cell assembly

Example

Use in Lemonergy

Place operations and quality checks in process order.

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Learn it in Lesson 3 · Cell production →

Connected concepts

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Cell production

The three-phase process that turns powders and foils into finished cells: electrode making, cell assembly and cell finishing. Electrode making is a roll-to-roll chemical process; assembly is precision mechanics; finishing is electrochemistry that takes weeks.

Electrolyte filling

Injecting a measured volume of electrolyte into the sealed-but-for-one-opening cell, usually under vacuum followed by pressure so the liquid is pulled into the pores. The cell then rests for wetting before formation.

Stacking

Building a cell from individual electrode sheets interleaved with separator, either sheet by sheet or by folding a continuous separator in a zigzag. It uses the volume of a rectangular case better than winding but is slower and more exacting.

Tab welding

Joining the bundle of foil tabs to the terminal tab, usually by ultrasonic welding, which bonds thin foils without melting them; laser welding is used for can-to-cap and busbar joints. A weak weld raises resistance and can fail in service.

Winding

Rolling the two electrode strips and two separator strips together around a mandrel into a jelly roll. It is fast and well understood, and it produces the round roll of a cylindrical cell or the flattened roll of many prismatic cells.

References & further reading

Technical references

1. Current and future lithium-ion battery manufacturing

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

   Technical reference · Electrode preparation, cell assembly, formation and manufacturing trade-offs.