Airport Apron Bus is equipped with two national standard DC charging ports (dual gun charging ports), which can be charged using national standard universal charging pile, side by side at the front of the vehicle, the standard fast charge is 1C. The power battery has a capacity of 281.9kwh, and its charging time is 2.9h for a single gun and 2h for a dual gun.
Airport Apron Bus uses the well-known brand CATL energy lithium iron phosphate (LFP) battery.
1. The voltage platform of the system is 618.24V, the system capacity is 228AH, the total energy storage is 281.9kwh, and the combination method is 2x4 boxes (2 and 48 strings), a total of 2 and 192 strings, that is, 8 power battery boxes;
2, the system is composed of 10 power battery boxes through the first series and then parallel, of which C1, C2, C3, C4 in series into a group, and the other group by C5, C6, C7, C8 in series.
3, the box is all arranged on the top of the vehicle, the glass steel cover heat insulation, sun protection ventilation technology, and the anti-collision structural beam is set to ensure the anti-collision protection of the box, while C3, C7 box with insurance (Fuse) to ensure the safety of the system.
4. Each box of the system is equipped with an external automatic fire extinguishing device. When the temperature inside the box reaches the ignition point of hexafluoropropane fire extinguishing agent, the fire extinguishing agent of the automatic fire extinguishing device is automatically sprayed into the box through the pipeline to extinguish the fire; At the same time, each power battery compartment is equipped with no less than one automatic fire extinguisher. When the high pressure connection part is too warm or there is a dangerous situation, the automatic fire extinguisher realizes the automatic spray fire extinguishing, so as to ensure the safety of the vehicle.
5. When an early warning occurs, the driver can directly press the emergency switch to start the fire extinguisher.
6, the use of liquid cooling cooling, the use of air conditioning integrated board change refrigeration unit, to ensure that the battery heat dissipation effect is better. When the temperature in the battery pack is higher than 15 ° C, the refrigeration unit starts to reduce the temperature in the battery pack. When the temperature in the battery pack is lower than 7 ° C, the refrigeration unit stops working to ensure that the temperature in the battery pack does not decrease. Make the ambient temperature of the battery pack closer to the normal operating range of the power battery.
7, the power battery management system (BMS) is an important link between the power battery and electric vehicles, its main functions include real-time monitoring of battery physical parameters, battery status estimation, online diagnosis and early warning, charge and discharge and pre-charge control, balance management and thermal management. Under normal operating conditions and correct maintenance conditions, the monomer capacity attenuation does not exceed 30% in 8 years.
