A comparative evaluation on state of charge estimation methods for Lithium ion batteries of electric vehicles
Due to strengthening enforcement of environmental laws and regulations, electrification of the automotive powertrain has been advancing so rapidly that rechargeable batteries used as a source of power are becoming increasingly important. Among them, lithium-ion batteries (LiBs) are expected to evolve at a high rate regarding light weight, high energy density and long lifetime. In order to make the most capacity of lithium-ion batteries in the strict automotive environment, the battery management system (BMS) constantly monitors the state of the batteries, and estimates the state-of- charge (SOC) for avoiding overcharge / overdischarge of the batteries. This paper focuses on the existing methods for estimating SOC from voltage, current and temperature of automotive LiBs, performs comparative evaluation, and proposes a process for SOC estimation.
Schlüsselwörter:BMS LiB SOC estimation OCV EKF
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