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Improve the 200ah lifepo4 battery balance of the battery backup system

(Summary description)The 200ah lifepo4 battery balance technology is a proprietary algorithm that can obtain the power and impedance information that changes over time to accurately calculate the state of charge (SOC) and remaining power.

Improve the 200ah lifepo4 battery balance of the battery backup system

(Summary description)The 200ah lifepo4 battery balance technology is a proprietary algorithm that can obtain the power and impedance information that changes over time to accurately calculate the state of charge (SOC) and remaining power.

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The 200ah lifepo4 battery balance technology is a proprietary algorithm that can obtain the power and impedance information that changes over time to accurately calculate the state of charge (SOC) and remaining power.

200ah lifepo4 battery balance

In the application of battery backup power, the battery will be charged briefly every few days to replenish the self-discharge, and it will rarely be completely discharged. When dealing with this kind of application, we need to know some special conditions. When using 200ah lifepo4 battery balance, the balance function of the fuel gauge must be turned off, or an enhanced firmware must be used. This article will introduce a firmware developed by TI specifically for the bq20z45-R1 fuel gauge, which programs the data flash parameters to achieve normal battery cycling and optimal balance results. We will also introduce some principles for achieving 200ah lifepo4 battery balance when the balance function is turned off under normal working conditions.

After about 10 years of analysis, the comparison of all 200ah lifepo4 battery balance single cells, open circuit voltage (OCV) voltage density graphs and depth of discharge (DOD). (DOD is exactly 1/SOC.) You can see that a large part of the SOC curve, the voltage of the 200ah lifepo4 battery balance is very flat. This flat voltage makes it difficult to accurately estimate the SOC required for battery balancing through the impedance tracking algorithm. At the end of charging (about 0% DOD), the voltage rises significantly, which leads to significant battery-to-battery voltage divergence, which further complicates SOC estimation and battery balancing.

200ah lifepo4 battery balance can accurately measure battery SOC throughout the battery life cycle. However, in battery backup power applications, in order to obtain the best operating results, we need to consider some issues and make some modifications. This article describes how to use TI’s LiFePO4 battery-enhanced bq20z45-R1 firmware to achieve correct battery balance and obtain reliable Qmax updates to achieve the best accuracy.
 

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