For most applications, individual battery cells do not achieve the required voltage, capacity or, most often, both.

Therefore, after selecting a suitable battery cell for the customer, the next step is to modularise them into larger units. By connecting the individual cells in series-parallel and equipping them with control electronics (BMS), the basic building block, the so-called module, is created.

When designing traction batteries at EVC, we prefer to build cells into fixed module sizes, mainly to ensure mass production and reduce costs for the customer. For larger applications, modules are further serialised into battery cabinets to achieve the required voltage and capacity ratings, while some small applications work with a single module and a simplified version of the BMS.

EVC battery modules are not simply a mechanical assembly of individual cells into larger systems, but a reworking of the experience of operating dozens of vehicles to ensure the highest possible energy density ratio by volume and weight. They respect the dilatation of individual cells (especially for bag cells), the cooling requirement and the mechanical robustness. In the case of pencil cells, each cell is protected by a current 'fuse' in the form of an intentionally weakened jumper.