This section explains the calculation of cell quantity to meet the required voltage during battery pack design. The system operating voltage is mainly determined by the drive motor. With a defined target pack voltage, the required number of series cells can be calculated with the formula below (based on standard single-cell specs):N=Vc​Vp​​N = number of series cells; Vp​ = total pack voltage; Vc​ = nominal single-cell voltage.

Take a 350V battery pack as an example:

Cell counts are rounded to enable even grouping into multiple modules during assembly. For the 96-cell NMC design: options include 8 modules of 12 cells each, or 4 modules of 24 cells each. If rounded up to 98 cells, the pack is split into 7 modules with 14 cells per module.

Module configuration must also comply with the Cell Supervision Circuit (CSC), also named Voltage & Temperature Monitor (VTM). A single CSC board typically monitors 12~16 cells. If the selected CSC supports a maximum of 12 cells per channel, each module shall contain no more than 12 cells. Accordingly, the 96-cell pack has to be divided into a minimum of 8 modules for the 350V system.