How each format is built
Cylindrical cells, such as the 2170 and 4680 formats, wind long electrode sheets into a steel can. A single vehicle pack can contain hundreds or thousands of them, often bonded into structural assemblies with adhesives or potting compounds. Prismatic cells use a rigid rectangular case, typically aluminium, and are usually much larger, so a pack needs far fewer of them. Pouch cells seal stacked or folded electrodes inside a flexible laminated aluminium and polymer film.
These construction choices affect everything that happens downstream. Rigid cans and cases resist mechanical damage during transport, while soft pouches do not. Large prismatic cells are easy to identify, connect and test individually, whereas small cylindrical cells are only practical to test at module or brick level. In practice, the way cells are joined into modules, whether by welds, bolts or adhesives, often matters more to recyclers than the cell format itself.
| Format | Disassembly | Second-life potential | Handling notes |
|---|---|---|---|
| Cylindrical | Hard where bonded or potted | Usually module level only | Robust cans, many small cells |
| Prismatic | Easiest when bolted | Strong, cells easy to regroup | Heavy, rigid cases |
| Pouch | Moderate, fragile films | Possible with care | Watch for swelling and punctures |
What format means for second life
Second-life value depends on reusing modules or cells without costly rework. Bolted prismatic modules come apart cleanly, can be tested cell by cell and can be regrouped into new strings with closely matched characteristics. That is a major reason LFP prismatic packs are popular feedstock for stationary storage projects. Pouch modules can also be reused successfully, but only where casings are intact, there is no swelling and the compression structure holding the cells is undamaged.
Cylindrical packs are harder to reuse. Individual cells are too small to regrade economically at scale, and structural designs, including some that use 4680 cells, bond cells into assemblies that were never meant to be opened. Reuse is then limited to intact modules or bricks tested as a unit. Where that is not possible, the material moves directly to recycling, and the value realised depends mainly on chemistry and black mass quality.
- Bolted prismatic modules: strongest reuse case
- Pouch modules: reusable if casings and compression frames are intact
- Bonded cylindrical packs: reuse usually limited to intact bricks
- Structural packs: often routed straight to recycling
What format means for recycling
During shredding, steel-cased cylindrical cells add a ferrous stream that is easy to separate magnetically, and aluminium prismatic cases add a valuable non-ferrous fraction. Pouch films add laminated plastic and aluminium that need additional separation steps. None of these alters the core chemistry of the black mass, but they shift yields, influence which separation equipment is needed and change the value of the by-product streams a site can sell alongside it.
Safety behaviour differs too. Damaged cylindrical cells can eject material forcefully, prismatic cells tend to vent through designed safety valves, and pouch cells can swell and rupture. Pre-discharge, controlled feed rates and inert or oxygen-depleted shredding atmospheres are standard across formats, but operators tune procedures to the dominant format on each line. Mixed-format feed is manageable, although it usually requires more conservative settings and closer monitoring.