Dongfeng Xiaokang K01 New Energy Commercial Vehicle

If the battery needs to provide both long-term energy storage and short-term pulse power for engine starting or vehicle starting, then the battery design needs to adopt a compromise solution. More electrodes need to be used in each battery cell to increase the total surface area. The increased current is distributed over a larger electrode area, which can maintain the battery voltage drop to meet system requirements. If the power demand can be provided by other devices, the battery can use thicker electrodes to achieve energy storage requirements at low rates while achieving better durability. A more ideal method is to use supercapacitors to provide pulse power, while batteries only provide energy storage. Supercapacitors can be recharged at a lower rate to prepare for the next power output, or charged using braking energy recovery. After charging through a supercapacitor, the battery can operate within a wide range of State of Charge (SOC), as the power required for starting is already stored in the supercapacitor. The combination of batteries and supercapacitors inevitably requires a more complex charging system, as the charging and discharging characteristics of batteries and supercapacitors differ significantly, resulting in a significant difference in their charging cutoff voltage. Therefore, it may be necessary to use a DC/DC converter or switching device to control two devices on the same DC bus.