ANALYSIS OF VOLTAGE DROP-IN HIGH-POWER LITHIUM-ION BATTERY DURING CHARGE & DISCHARGE CYCLES AT DIFFERENT C-RATES & TEMPERATURES

Abstract

Globally, electric automobiles (EVs) are the newest and most innovative technology in the transportation industry. Their decreasing consumption of fuel and emissions of greenhouse gases are making them increasingly significant. Super capacitors, fuel cells, and batteries are examples of storage mechanisms for energy that are used to store power, which is used as energy for electric vehicles (EVs) and powers their electric motor. Lead-acid and nickel metal hydride batteries were originally utilized in automobiles. Li-ion batteries (LIBs) have risen to the top of the market for usage in electric vehicles (EVs) thanks to recent improvements. State of charge (SOC) estimate has grown in importance inside the battery management unit (BMS) and has contributed to the advancement of electric car technology. The added benefit is that it gives users access to precise SOC measurements through real-time battery monitoring. This lowers the danger of overvoltage cells by extracting correct SOC measurements from certain battery charging and discharge procedures. Many techniques for estimating state of charge (SOC) rely on the open circuit voltage (OCV) gradient. This paper examines the impact of a voltage reduction in high-power lithium-ion batteries for 0% to 100% SOC at various degrees and c-rates. The outcome demonstrates that the voltage reduction is greater at higher C rates than it is at lower C rates, and this is also true at higher temperatures.