What is a High Voltage Box in Energy Storage Systems? A high voltage box, often referred to as a high-voltage distribution cabinet, is an essential component in containerized energy storage systems. It is responsible for collecting the direct current (DC) output from multiple battery clusters. A high voltage junction box (HVJB) in an electric powertrain is a critical electrical component that manages and distributes high voltage electrical power from the main battery pack to various high-voltage subsystems within an electric vehicle (EV) or hybrid vehicle. Discover how advanced components and intelligent monitoring solutions are reshaping this crucial BESS element. High voltage. High-voltage direct current (HVDC) transmission systems are playing an increasingly vital role in today's energy landscape, which is defined by rapid digitalization, accelerated decarbonization, and the unprecedented growth of distributed energy resources (DER), inverter-based resources (IBR), and. High voltage distribution box is the control part of EV power supply, which has the functions of power distribution, current measurement, short circuit protection, charge and discharge control, pre-charging, manual emergency stop and insulation testing port.