Hello friends. I am a student majoring in electrical engineering, I have a question about battery pack problem. How do we understand the terms DOD and SOC in battery pack? What is the relationship between DOD and SOC? How can we design a battery pack with a battery load capacity of 1MW and a storage time of 0.5 hours? In the battery pack, there are usually two charging and discharging modes, how can the charging and discharging modes be controlled?. Thank you very much for all the comments you have shared.
Hello Sơn Thái Sơn Phùng. DOD (depth of discharge) and SOC( state of charge) are studied to understand the performance of any kind of battery. The SOC is usually expressed using percentage points (0% = empty; 100% = full), Depth of Discharge (DoD) is either expressed using units of Ah (e.g. for a 50 Ah battery, 0 Ah is full and 50 Ah is empty) or percentage points (100% is empty and 0% is full). The capacity of a battery may be higher than its nominal rating. Thus it is possible for the depth of discharge value to exceed the nominal value (e.g., 55 Ah for a 50 Ah battery, or 110%).
At almost all known rechargeable battery technologies, such as lead-acid batteries of all kinds like AGM, there is a correlation between the depth of discharge and the cycle life of the battery. Depth of Discharge is defined as the total amount of energy that is discharged from a battery, divided by the battery nominal capacity. Depth of discharge is normally expressed as a percentage. For example, if a 90 Ah battery is discharged for 20 minutes at a constant current of 50 A, the depth of discharge is : (100% * (50 amps * ((20 mins / 60 mins) hours))) / 90Ah = (100% * (50A * 0.33333h)) / 90Ah = (100% * 16,67Ah) / 90Ah = 1667%Ah / 90Ah = 18.522% .
In the following paper you can see the relationship between DOD, SOC and EIS circuits.
Sincere thanks to Aqsa Nazir. I am very grateful for what you have shared with me. Good luck to you in your research field.
Sincere thanks to An Giang Nguyen for the knowledge you share with me.
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