Ah (Ampere Hours): An indicator that reflects the size of the battery capacity, such as 48V 100Ah means that the battery capacity is 4.8 kilowatt-hours.
Nominal voltage and nominal ampere hours are the most basic and core concepts of batteries.
Electricity Wh=Power W*hour h=Voltage V*Ah
C (battery discharge C rate): reflects the battery charge and discharge capacity rate; charge and discharge rate = charge and discharge current / rated capacity.
A measure of the speed of discharge. Generally, the capacity of the battery can be detected by different discharge currents.
For example, when a battery with a capacity of 100A·h is discharged at 15A, its discharge rate is 0.15C.
DOD (Depth of Discharge) depth of discharge: refers to the percentage of the capacity released by the battery to the rated capacity of the battery during the use of the battery.
For the same battery, the set DOD depth is inversely proportional to the battery cycle life. When improving performance in one aspect, performance in other aspects will be sacrificed. For example: in the case of DOD 80%, the cycle life of lithium battery can reach 6,000 ~ 12,000 times.
SOC (State of charge) is the state of charge, indicating the percentage of the battery's remaining power to the battery's rated capacity.
SOH (State of Health) battery health status (including capacity, power, internal resistance, etc.), is the ratio of the capacity discharged from the fully charged state to the cut-off voltage and the corresponding nominal capacity.
To put it simply, it is the ratio of the performance parameter to the nominal parameter after the battery has been used for a period of time. The new battery is 100%, and it is 0% if it is completely scrapped. According to the IEEE standard, after the battery has been used for a period of time, the capacity of the battery is low when it is fully charged. 80% of the rated capacity, the battery should be replaced.
three-stage
Three-stage charging generally refers to a device that is charged in three stages. Three-stage charging is an automatic charging process. Constant current, constant voltage and float charging are the three necessary stages of three-stage charging.
BMS (Battery Management System) battery management system
For battery status monitoring, battery balance management, battery safety, and data communication.
BMU (Battery Management Unit) battery module energy management system
Battery module energy management system Multiple battery management systems.
EMS (Energy Management System) energy management system
EMS is mainly used for internal energy control of the micro-grid to maintain the power balance of the micro-grid for normal operation; to meet the on-site energy dispatching needs of small and medium-sized commercial energy storage systems; to meet the dispatching of large-scale energy storage systems that will involve the grid side.
In terms of levels, BMS acts on the bottom battery side management, while EMS acts on the overall scheduling of the microgrid system.
