Exploring battery resistance values in Lithium-Ion Batteries
The battery resistance values for lithium-ion batteries are crucial for assessing the efficiency of charge transfer and ion migration within the battery. These battery resistance values significantly impact the battery's performance metrics such as charging/discharging efficiency, power output, thermal management, and aging rate.
Methods to Measure Battery Resistance Values
Various techniques are employed to gauge the battery resistance values, such as direct current internal resistance (DCIR), alternating current internal resistance (ACIR), and electrochemical impedance spectroscopy (EIS). Each method offers unique insights into the battery's characteristics.
ACIR and Its Impact on Battery Resistance Values
ACIR is noteworthy for its high repeatability when measuring battery resistance values and can complete measurements in milliseconds. With automated equipment, ACIR can efficiently assess battery resistance values in batches, making it ideal for battery inspection and grouping single cells.
DCIR and its Role in Assessing Battery Resistance Values
Compared to ACIR, battery resistance values obtained through DCIR have less reproducibility. DCIR takes more time to measure battery resistance values, requiring calculations from the charge/discharge data. Battery resistance values measured by DCIR tend to be closer to the actual operational resistance of the battery. However, the DCIR testing equipment is larger, heavier, and consumes more energy compared to ACIR.
The Normalized Range of Battery Resistance Values
Many manufacturers specify battery resistance values for lithium iron phosphate (LFP) commercial batteries, typically ranging from 35-70 m Ω * Ah. Understanding these battery resistance values is essential for both optimizing the current technology and planning for advancements.