How to estimate SOC in lead-acid battery?

For lead-acid battery SOC estimation, an improved SOC estimation algorithm based on open circuit voltage and ampere hour integration is proposed. By studying the SOC initialization method based on multiple parameters, the problem of long standing time required by open-circuit voltage method to determine the initial value of SOC is solved.

How does Texas Instruments determine SOC of lead acid batteries?

Texas Instruments uses the Impedance Track method to determine SoC of lead acid batteries . While current off, the OCV is measured, which is used to determine the SoC and to update Q MAX. When discharging, both discharge current and voltage are measured.

What is the charge factor of a lead-acid battery?

With lead-acid batteries, a charge factor of 1.05–1.2 is used, depending on the battery type. Additionally, this method implies that the charging operation is controlled. A current-loss calculation approach for photovoltaic (PV) applications was developed by Jossen .

What are lead acid batteries used for?

Lead acid batteries are typically used in the automotive industry, where they provide a high current pulse to start the vehicle, in traction applications, where they undergo periodic deep discharge and charge, and in stationary applications, where they remain in charged state most of their life.

What are the methods of estimating a battery?

Estimation methods based on measurement values of specific characterization parameters of the battery, including residual capacity method, impedance spectrum method, open circuit voltage method, etc. The residual capacity method is obtained by constant discharge of electricity for a long time.

How do you estimate a battery loss?

The most simple loss estimation method is to apply a constant charge factor to the battery at each recharge, i.e. a constant loss is assumed and this loss is additionally returned to the battery. Such a method is only suitable for systems that are not too sensitive to overcharge.