The full name of BMS is Battery Management System. It is a device to monitor the status of energy storage batteries, mainly for the intelligent management and maintenance of each battery unit, in order to improve the utilization of the battery, to prevent overcharging and over-discharging of the battery, to extend the service life of the battery, and to monitor the status of the battery.
The BMS system is mainly used for real-time monitoring of battery parameters, fault diagnosis, SOC value estimation, mileage estimation, short-circuit protection, leakage monitoring, display alarms, charging and discharging mode selection, etc., and interacts with the vehicle controller or charger through the CAN bus to ensure the high efficiency, reliability and safe operation of the vehicle, as well as to ensure the safety and security in the process of the vehicle's use.
BMS battery management system mainly has the following functions:
(1) Real-time acquisition of battery system operating state parameters
Real-time collection of terminal voltage and temperature of each battery in the battery pack, charging and discharging current and total battery pack voltage. As the performance and status of each battery in the battery pack are not consistent in use, it is important to check the performance of the battery system and the status of the battery.
performance and state are not consistent, thus the voltage, current and temperature data of each battery should be monitored.
(2) Determine the SOC value of the battery
Accurately estimate the SOC value of the power battery pack, so as to forecast at any time how much energy is left in the storage battery of the electric vehicle or the SOC value of the storage battery, so that the SOC value of the battery can be controlled at 30%~70%.
value is controlled in the operating range of 30%~70%.
(3) Fault diagnosis and alarm
When the battery pack power or energy is too low and needs to be charged, timely alarm is given to prevent the battery from over-discharging and damaging the service life of the battery; when the temperature of the battery pack is too high and
non-normal work, timely alarm to ensure the normal operation of the battery.
(4) Thermal balance management of the battery pack
Battery thermal management system is an organic part of the battery management system, its function is to make the battery temperature in the normal operating temperature range through the cooling system such as fan and thermal resistance heating device.
Its function is to keep the battery temperature within the normal operating temperature range through cooling systems such as fans and thermal resistance heating devices.
(5) Consistency Compensation
When there is a difference between the batteries, there are certain measures to compensate, to ensure that the battery pack has a stronger performance ability, and there are certain means to show the location of the battery with poor performance, so that it can be repaired and replaced.
facilitate repair and replacement. Charging compensation function is generally used. Designed with a bypass shunt circuit to ensure that each single unit can be fully charged, which can slow down the progress of battery aging and
prolong the service life of the battery.
(6) Communication between each detection module and the central processing unit is realized through a bus
Electric Towable Passenger Steps Technical Parameters
Dimensions (L×W×H): 7770×2400×3650mm
Lift height range of passenger elevator: 2400~5800mm
Upper platform size: 3300mm*2200mm
Step size: 285mm*1500mm*192mm
Stroke of movable platform : 0-400mm
Maximum angle between the ladder body and the level : 38.5°.
Minimum ground clearance: 200mm
Outer diameter of channel circle : 18200mm
Front/rear wheelbase : 2000/2000mm
Total mass : 7380KG
Carrying capacity: 100 persons
Front axle load capacity : 3560kg
Rear axle load capacity: 3820kg
Maximum speed: 30
Minimum stabilized speed: 0.8
Drive motor power: 30kw
Total voltage: 309.12V
Total energy storage capacity: 70.48kwh lithium iron phosphate battery pack
Temperature range : -35~65
Battery energy density : 162.26Wh/kg
Wheelbase : 3400mm