At present, there are still many hybrid vehicles and pure electric vehicles using a new generation of lead-acid batteries. In the past ten years or so,
Lithium-ion power battery has been applied to the production of electric vehicles, showing its advantages more and more.
Max J. A.MAS, an American scholar, put forward the acceptable current theorem of battery charging through a large number of experiments: 1) For any given discharge current,
The charge acceptance current of the battery is proportional to the square root of the discharge capacity; 2) For any depth of discharge, the charge acceptance rate and discharge power of the battery.
The logarithm of current is directly proportional, and increasing discharge current can improve the charging acceptance ratio; 3) The battery discharges at several discharge rates and receives current.
Is the sum of the accepted currents of each discharge rate. That is to say, the acceptable charging current of the battery can be improved by discharging. In the charging connection of the battery,
When the receiving capacity decreases, the discharge can be increased during charging to improve the receiving capacity.
The performance and life of automotive power batteries are not only related to their own parameters, but also related to many factors, such as the quality of battery plates and electrolyte concentration.
Outside; There are also external factors, such as battery charging and discharging parameters, including charging mode, charging end voltage, charging and discharging current, discharging depth and so on.
This brings many difficulties to the battery management system BMS to estimate the actual capacity and SOC of the battery, and many variables need to be considered.
The battery management system of WG 6 120 HD ~ HEV is based on SOC value management. . SOC (state of charge) refers to the amount of electricity.
The change of charging parameters in the battery core reflects the remaining capacity of the battery, which has formed a unified understanding at home and abroad.