Polarization Voltage Characterization of Lithium-Ion Batteries Based on a Lumped Diffusion Model and Joint Parameter Estimation Algorithm

Abstract

Polarization is a universal phenomenon that occurs inside lithium-ion batteries especially during operation, and whether it can be accurately characterized affects the accuracy of the battery management system. Model-based approaches are commonly adopted in studies of the characterization of polarization. Towards the application of the battery management system, a lumped diffusion model with three parameters was adopted. In addition, a joint algorithm composed of the Particle Swarm Optimization algorithm and the Levenberg-Marquardt method is proposed to identify model parameters. Verification experiments showed that this proposed algorithm can significantly improve the accuracy of model output voltages compared to the Particle Swarm Optimization algorithm alone and the Levenberg-Marquardt method alone. Furthermore, to verify the real-time performance of the proposed method, a hardware implementation platform was built, and this system’s performance was tested under actual operating conditions. Results show that the hardware platform is capable of realizing the basic function of quantitative polarization voltage characterization, and the updating frequency of relevant parameters can reach 1 Hz, showing good real-time performance.

Modification in the microstructure of sodium carboxymethylcellulose/polyvinyl alcohol polyblend films through the incorporation ofNaNO3for energy storage applications

“…Initial OCV was recorded as 1.33 V, which slightly drops to 1.20 V and is stable up to 30 hours. This initial drop is due to activation polarization 86 . The battery discharge characteristics under the load of 100 kΩ are shown in Figure 18B.…”

“…This initial drop is due to activation polarization. 86 The battery discharge characteristics under the load of 100 kΩ are shown in Figure 18B. The initial drop in the output voltage is due to the polarization and internal IR drop.…”

Investigating the effect of the degree of cross‐linking in styrene butadiene rubber on the performance of graphite anodes for the use in lithium‐ion batteries

“…Figure 4 provides the voltage profiles at cycle 1 and 80 for the binder systems investigated in this study, with the corresponding voltages at 50% SOC being provided in Table 3. Polarization is a phenomenon that occurs in all LIBs, which can hinder the intercalation and deintercalation processes, resulting in capacity fade 24 . For SBRs C and D, only a low degree of polarization was observed, with the voltages for 50% SOC only increasing by 0.02 volts between the 1st and 80th cycles.…”

“…Polarization is a phenomenon that occurs in all LIBs, which can hinder the intercalation and deintercalation processes, resulting in capacity fade. 24 For SBRs C and D, only a low degree of polarization was observed, with the voltages for 50% SOC only increasing by 0.02 volts between the 1st and 80th cycles. These low amounts of polarization values for the SBR systems with a higher DoCL can be linked to these binder systems forming a more stable and robust SEI layer.…”

Analysis of Performance Degradation in Lithium-Ion Batteries Based on a Lumped Particle Diffusion Model

“…Ohmic overpotential is caused by the electrolyte resistance when the current passes through the lithium battery, and it is used to characterize the ohmic loss . Referring to the first-order equivalent circuit model, it can be expressed by the following formula η normalo normalh normalm = R normalo normalh normalm I normalb normala normalt normalt where R ohm is the ohmic resistance.…”