The Types facet of Sodium Ion Battery Cell market taxonomy classifies cells by structural format and active‑material chemistry, each imposing distinct cost and performance envelopes. Prismatic cells, with rigid aluminum casings, dominate the stationary‑storage segment because their high volumetric efficiency aligns with module‑level integration; they represent roughly 40 % of total cell output. Cylindrical designs, exemplified by 18650‑type formats, retain a 30 % share, favored in portable‑electronics and EV power‑packs where mechanical robustness and mature manufacturing lines reduce unit cost. Pouch cells, flexible polymer‑film enclosures, account for about 20 % of production, delivering the highest gravimetric energy density and enabling thin‑profile devices, albeit with greater sensitivity to swelling. Flat or “coin” cells, used primarily for prototyping and niche sensor applications, contribute the remaining 10 %. Within each format, chemistries such as Na‑NMC (sodium nickel‑manganese‑cobalt oxide), Na‑LFP (sodium iron phosphate) and Na‑TFSI (sodium bis‑trifluoromethanesulfonyl imide) further differentiate cost structures and cycle‑life expectations, thereby refining the overall Sodium Ion Battery Cell segmentation and guiding investment priorities.