Improved Coupled Electrothermal Model of Lithium-ion Battery
| dc.contributor.author | Sinha, Shiv Shankar | |
| dc.date.accessioned | 2026-10-08T07:19:16Z | |
| dc.date.available | 2026-10-08T07:19:16Z | |
| dc.date.issued | 2022 | |
| dc.description.abstract | Lithium-ion Batteries (LIBs) are popular and promising storage technology for auto mobile applications mainly due to their high energy density, low self-discharge property, and high cycle life compared to other rechargeable batteries. However, their performance is very susceptible to both low and high temperatures. In general, the range of temperature for its optimal performance is between 15-35°C. The temperature has ad verse effects on LIB whenever being operated beyond this range. High temperatures, in particular, have a more detrimental impact on LIBs. At times, when the internal temperature exceeds a certain threshold, the battery may experience unstoppable chain reactions called thermal runaway which leads to fire and explosion. Moreover, this process is accelerated at high charge/discharge currents. Therefore, in high current applications, monitoring the internal temperature of the battery becomes crucial for building an effective thermal management system to ensure safety while enhancing the performance of the battery. Hence, an Improved Coupled Electrothermal Model (ICETM) has been proposed with the primary aim of reducing the computational time and improving the accuracy of the internal temperature estimation of the battery at high currents. The proposed thermal model has two sub-models: a) heat generation model with an efficient methodology for the calculation of entropy change, and b) three-state heat dissipation model considering heat dissipation in radial and axial direction for better core temperature estimation at high charge/discharge current rate. The improved thermal model is coupled with the second order (2 R-C branches) electrical equivalent circuit model through temperature dependence of electrical parameters and heat generation. Furthermore, using the A123 ANR26650M1-B battery the parameterization process of the proposed ICETM is carried out through experimental and simulation studies. Finally, the model is validated using two different profiles: Urban Dynamometer Driving Schedule (UDDS) drive cycle profile; 6C Constant Current Constant Voltage (CCCV) charging followed by 6C Constant Current (CC) discharging profile. The proposed ICETM is well capable of identifying the entropy coefficient time efficiently and has the ability to accurately estimate the core temperature at a higher current rate as compared to the two-state thermal model. | |
| dc.identifier.uri | http://nits.ndl.gov.in/handle/123456789/180 | |
| dc.language.iso | en | |
| dc.publisher | Department of Electronics and Instrumentation Engineering, NITS | |
| dc.relation.ispartofseries | D1526 | |
| dc.title | Improved Coupled Electrothermal Model of Lithium-ion Battery | |
| dc.type | Thesis |