Power battery pack equalization method based on terrain prediction

A power battery pack equalization method based on terrain prediction, comprising the following steps:

• S1, during running of a vehicle, predicting, by an e-horizon system, geographic information of a terrain that is ahead to generate geographic information data, transmitting, by the e-horizon system, the geographic information data to a battery management system (BMS) based on a standard advanced driver assistance systems (ADAS) interface specification (IS) protocol via a controller area network (CAN) bus or Ethernet bus in the vehicle;
• acquiring, by the BMS, the geographic information data corresponding to the geographic information of the terrain that is ahead of the vehicle from the e-horizon system;
• and
• S2, classifying the geographic information data by the BMS, setting a corresponding power prediction type based on a road information type, and then selecting to switch to a corresponding battery pack equalization mode based on the corresponding power prediction type, wherein when the corresponding power prediction type of a road ahead of a current vehicle position is low power and high energy recovery, charging equalization is performed on a corresponding battery pack, and single batteries with low power capacity are charged through a supercapacitor;
• and when the corresponding power prediction type of the road ahead of the current vehicle position is high power and high energy consumption, discharging equalization is performed on the corresponding battery pack, and the supercapacitor is charged through single batteries with high power capacity;
• wherein the step S2 comprises:
• when the road information type of a slope ahead of the current vehicle position is a downhill slope, predicting that energy recovery will occur ahead of the current vehicle position, switching, by the BMS, the corresponding battery pack equalization mode to a charging equalization mode, obtaining a maximum single voltage (Vmax) of all the single batteries by performing voltage detection on the corresponding battery pack, and performing, by the supercapacitor, the charging equalization on single batteries with single voltages lower than the Vmax until an upper voltage limit is the Vmax, so that an entire battery pack is equalized;
• and
• when the road information type of the slope ahead of the current vehicle position is an uphill slope, predicting that energy is needed ahead of the current vehicle position, switching, by the BMS, the corresponding battery pack equalization mode to a discharging equalization mode, obtaining a minimum single voltage (Vmin) of all the single batteries by performing the voltage detection on the corresponding battery pack, and performing the discharging equalization on single batteries with single voltages higher than the Vmin until a lower voltage limit is the Vmin, so that the entire battery pack is equalized;
• and
• wherein before the step S2, detecting a system on chip (SoC) of the supercapacitor.