How It Impacts Efficiency, Performance, and Lifetime Battery performance is determined by many factors, but Internal Resistance (IR) is one of the most critical and least understood. For Energy Storage Systems (ESS), IR directly affects efficiency, available power, heat generation, cycle life, and the system's long-term economic value.
For Energy Storage Systems (ESS), IR directly affects efficiency, available power, heat generation, cycle life, and the system's long-term economic value. Understanding how IR works—and how it changes over time—is essential for designing, operating, and maintaining a high-performance and safe ESS. What Is Internal Resistance?
Internal Resistance is the inherent opposition inside a battery that resists the flow of current. It has two major components: Total IR = Ohmic Resistance + Polarization Resistance When current flows through the battery, internal resistance converts some electrical energy into heat: Heat = I² × R
Internal resistance is revealed as the dominant parameter of the battery model. Internal resistance is extended as a new state be estimated together with SOC. A 83% performance improvement of the proposed method is verified by experiments. The estimation of the internal resistance will be beneficial for the SOH research.
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