the main performance parameters of energy storage batteries
The main performance parameters of energy storage batteries：
The main performance parameters of energy storage batteries：
①Ah (ampere hours):
An indicator that reflects the battery capacity. For example, 48V 100Ah means the battery capacity is 4.8 degrees.
electricity. Nominal voltage and nominal ampere-hours are the most basic and core concepts of batteries.
Electricity Wh= Power W* hours h= Voltage V* Ampere-hours Ah
② C (battery discharge C rate): reflects the battery charge and discharge capacity rate;
Charge-discharge rate = charge-discharge current/rated capacity, which is a measure of discharge speed.
Generally, the capacity of the battery can be detected through different discharge currents.
For example, when a battery with a capacity of 100Ah is discharged at 15A,
The discharge rate is 0.15C.
③ DOD (Depth of Discharge) discharge depth:
Refers to the percentage of the capacity released by the battery to the rated capacity of the battery during battery use.
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.
④SOC (State of charge) state of charge:
Indicates the percentage of the remaining battery power to the battery’s rated capacity.
⑤ SOH (State of Health) battery health status (including capacity, power, internal resistance, etc.)
It is the ratio of the capacity released by the battery from a fully charged state to the cut-off voltage at a certain rate and its corresponding nominal capacity.
Simply put, it is the ratio of performance parameters to nominal parameters after the battery has been used for a period of time. A new factory battery is 100%, and a completely scrapped battery is 0%. According to IEEE standards, after a battery has been used for a period of time, the capacity of the battery when fully charged is low. Below 80% of rated capacity, the battery should be replaced.
⑥ Three-stage charging generally refers to a device that charges 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. The charging and discharging strategy of lead-acid batteries is three-stage:
⑦BMS (Battery Management System) battery management system
For battery status monitoring, battery balance management, battery safety, and data
⑧communication.
BMU (Battery Management Unit) battery module energy management system ：battery module energy management system multiple battery management systems.
⑨EMS (Energy Management System) Energy management system ：
EMS is mainly used for internal energy control of microgrids to maintain the power balance of microgrids for normal operation; to meet the on-site energy dispatch needs of small and medium-sized commercial-grade energy storage systems; to meet the needs of large-scale energy storage systems. Dispatch on the grid side. From a level perspective, BMS is responsible for the underlying battery side management, while EMS is responsible for the overall scheduling of the microgrid system.
