Structure of a prismatic battery cell
A prismatic Li-ion cell consists of multiple flat-wound, Li-Ion cells enclosed in a plastic case and connected to 2 large terminals.
We cut open a Shandong HiPower, 160 Ah, Li-ion, prismatic battery cell. (This cell is similar to a Thundersky / Winston / Sinopoly cell, and to a CALB / Sky Energy cell.)
(Cell courtesy of Peter Oliver of Make Mine Electric.)
The cut-out reveals its internal structure and construction.
Prismatic cell cut-out
The cell consists of:
Across the 51 mm thickness of the cell:
See also: GreenEV's dissection of a HiPower cell
Otmar Ebenhoech cut open a Thundersky cell (which apparently had bloated from being fully charged while not constrained).
Again, note that the positive terminal uses copper foils, and the negative uses aluminum.
Thundersky prismatic cell cut-out
(Picture courtesy of Otmar Ebenhoech of Cafe Electric.)