Electric Vehicle Battery Pack Internal Structure

This internal block diagram separates the electrical, sensing and thermal parts of an electric vehicle battery pack. Cell modules are the energy store. Voltage and temperature sensors report to the battery management controller, which commands cell balancing, the main contactors and the cooling loop. The charge port reaches the cells through the contactors, while the traction inverter is the pack's main vehicle load. This view is useful during an architecture review because it makes the safety boundary and the control paths clear without becoming a cell-level schematic. Add a CAN interface, fuse, service disconnect or insulation monitor when those interfaces matter to the discussion.