Apr 10, 2024
Detailed explanation of 5 major energy storage battery parameters
Content source: Energy Storage Technology School Batteries are one of the most important parts of electrochemical energy storage systems. With the reduction of battery costs and the improvement of battery energy density, safety and lifespan, energy storage has also ushered in large-scale applications. This article will help you understand energy storage Several important parameters of the battery. 01. Battery capacity Battery capacity is one of the important performance indicators for measuring battery performance. The capacity of a battery is divided into rated capacity and actual capacity. Under certain conditions (discharge rate, temperature, termination voltage, etc.), the amount of electricity released by the battery is called rated capacity (or Nominal capacity). Common units of capacity are mAh and Ah=1000mAh. Taking a 48V, 50Ah battery as an example, it means that the battery capacity is 48V×50Ah=2400Wh, which is 2.4 kilowatt-hours of electricity. 02. Battery discharge C rate C is used to indicate the battery charge and discharge capacity rate. Charge and discharge rate = charge and discharge current/rated capacity. For example: when a battery with a rated capacity of 100Ah is discharged at 50A, its discharge rate is 0.5C. 1C, 2C, and 0.5C are battery discharge rates, which are a measure of discharge speed. If the used capacity is discharged in 1 hour, it is called 1C discharge; if it is discharged in 2 hours, it is called 1/2=0.5C discharge. Generally, the capacity of the battery can be detected through different discharge currents. For a 24Ah battery, the 1C discharge current is 24A and the 0.5C discharge current is 12A. The larger the discharge current. The discharge time is also shorter. Usually when talking about the scale of an energy storage system, it is expressed by the maximum power of the system/system capacity (KW/KWh). For example, the scale of an energy storage power station is 500KW/1MWh. Here 500KW refers to the maximum charge and discharge of the energy storage system. Power, 1MWh refers to the system capacity of the power station. If the power is discharged with a rated power of 500KW, the capacity of the power station is discharged in 2 hours, and the discharge rate is 0.5C. 03. SOC (State of Charge) state of charge The battery's state of charge in English is State of Charge, or SOC for short. It refers to the ratio of the remaining capacity of the battery after it has been used for a period of time or left unused for a long time and its capacity in the fully charged state. It is usually expressed as a percentage. Simply put, it is the remaining capacity of the battery. 04. DOD (Depth of Discharge) depth of discharge Depth of Discharge (DOD) is used to measure the percentage between battery discharge and battery rated capacity. For the same battery, the set DOD depth is inversely proportional to the battery cycle life. The deeper the discharge depth, the shorter the battery cycle life. Therefore, it is important to bala...
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