Views: 8 Author: Site Editor Publish Time: 2024-03-28 Origin: Site
Batteries are one of the most important parts of electrochemical energy storage systems. With the reduction of battery costs, the improvement of battery energy density, safety, and lifespan, energy storage has also ushered in large-scale applications. This article takes you to understand several important parameters of energy storage batteries.
Battery capacity is one of the important performance indicators for measuring battery performance. The capacity of a battery can be divided into rated capacity and actual capacity. The amount of electricity released by a battery under certain conditions (discharge rate, temperature, termination voltage, etc.) is called rated capacity (or nominal capacity). The common units of capacity are mAh and Ah=1000mAh. Taking a 48V, 50Ah battery as an example, the capacity of the battery is 48V x 50Ah=2400Wh, which is 2.4 kWh.
C is used to represent the rate of battery charging and discharging capacity. Charge discharge rate=charge 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 measures of the battery discharge rate, indicating the speed of discharge. The capacity used is discharged within 1 hour, which is called 1C discharge; If the discharge is completed within 2 hours, it is called 1/2=0.5C discharge. The capacity of a battery can generally be measured by different discharge currents. For a 24Ah battery, the discharge current at 1C is 24A, and the discharge current at 0.5C is 12A. The greater the discharge current. The shorter the discharge time.
When it comes to the scale of an energy storage system, it is usually expressed as the maximum power/system capacity (KW/KWh). For example, if the scale of an energy storage power station is 500KW/1MWh, 500KW refers to the maximum charging and discharging power of the energy storage system, and 1MWh refers to the system capacity of the power station. If the rated power of 500KW is used for discharge, the capacity of the power station will be discharged in 2 hours, and the discharge rate will be 0.5C.
State of Charge (SOC) of a battery refers to the ratio of its remaining capacity after being used for a period of time or left unused for a long time to its capacity in its fully charged state, usually expressed as a percentage. Simply put, it is the remaining charge of the battery.
The Depth of Discharge is a percentage of the energy used to measure the battery's energy and the battery's quantification. It's also a battery, a DOD depth and a battery's life, which is more intense and less efficient, so it's important to take time to balance the battery.
If the change in SOC during the process of fully emptying to fully charging the battery is recorded as 0-100%, it is best to operate each battery in the range of 10% to 90% in practical applications. If it is less than 10%, it may lead to over discharging and irreversible chemical reactions that affect the battery life.
The SOH state of Health indicates the ability of the battery to dump energy in front of the battery, which means that the battery filled the electric energy and the new battery filled the electric energy. The current definition of SOH is based on quantities, energy, internal barriers, cycling and peak efficiency in a few ways, with the highest possible energy and quantity.
Generally, when the capacity (SOH) of a battery drops to around 70% to 80%, it can be considered that it has reached the end of its life (EOL). SOH is an indicator that describes the current health status of the battery, while EOL indicates that the battery has reached the end of its life and needs to be replaced. By monitoring the SOH value, the time when the battery reaches EOL can be predicted, and corresponding maintenance and management can be carried out.
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