Calculating the depth of discharge (DoD) of a battery is straightforward. To calculate DoD, you need to know the initial capacitgy of the battery (the total energy it can hold) and the amount of energy that has been discharged from the battery. Here’s a simplified formula to calculate the depth of discharge (DoD) of a battery:
Depth of discharge, denoting the proportion of a battery’s capacity that has been utilized, is a key factor influencing battery performance. A high DOD allows for more of the battery’s energy to be used before needing to be recharged, but it can also reduce the number of recharge cycles of the battery.
For example, if you have a lithium battery with 100 Ah of usable capacity and you use 40 Ah then you would say that the battery has a depth of discharge of 40 / 100 = 40%. The corollary to battery depth of discharge is the battery state of charge (SOC).
The corollary to battery depth of discharge is the battery state of charge (SOC). In the above example, if the depth of discharge is 40%, then the state of charge is 100% - 40% = 60%. When it comes to battery performance, DOD plays a crucial role.
The DOD conditions of the batteries are set according to their cut-off voltages; the optimal DOD is determined according to the battery state by analyzing the total discharge energy and Coulombic efficiency up to the end of life (EOL) of the battery by the DOD condition.
To calculate DOD, you need to divide the capacity discharged from a fully charged battery by the battery’s nominal capacity and express the result as a percentage. For example, if you have a lithium battery with 100 Ah of usable capacity and you use 40 Ah then you would say that the battery has a depth of discharge of 40 / 100 = 40%.
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6. Controlling depth of discharge
Dynamic cut-off is useful for batteries with a high internal resistance. For example OPzV and OPzS; but is less relevant for LiFePO4 batteries because of their low internal-resistance. See …
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