Battery thermal management (BTM) is essential to ensure the safety of the battery pack of electric vehicles. For a variety of BTM technologies, the battery's internal resistance always plays a critical role in the he. Lithium-ion battery (LIB), with the features of high specific energy, high power, long life-cycle, low s. 2.1. Experiment platformThe experimental platform (Fig. 1) consists of an environment chamber for environment control, batteries, an electronic load (ITECH IT8511), a charge. 3.1. The construction of MF-DIRMThe internal resistance R of battery discharge is affected by temperature T, SOC and discharge rate C. The function relation of interna. 4.1. Effect of the temperature and SOC on internal resistanceWhen the discharge rate is 0.25C and the temperature varies from 5 °C to 45 °C, the change curves o. In this study, the synergistic effect of three factors (temperature, SOC and discharge rate C) on the battery's internal resistance was explored and an innovative method MF-DIRM was co.
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Why is internal resistance important for lithium ion batteries?
Internal resistance is also a critical index to define state of health (SoH) for lithium ion batteries 3. Cell resistance also has implications for the performance of the entire battery system. Battery systems in applications such as electric vehicles (EVs) employ a large number of cells connected in series and parallel.
What are R and thermal characteristics of lithium ion batteries?
The R characteristics refer to the variation of the R varying with different parameters such as the value of SOC (Ssoc), Tamb and charge/discharge rate of the battery. The current researches about the R and thermal characteristics of LIBs mainly focus on the analysis of the influence factors and the establishment of the internal resistance model.
What is the dynamic model for lithium-ion batteries DCR?
A dynamic model was proposed for lithium-ion batteries DCR based on multiple influencing factors. This model employs a bivariate polynomial of degree four to characterize the relationship between DCR, temperature, and SOC.
What factors affect the DCR of lithium-ion batteries?
Building upon the above analysis, it can be concluded that the primary factors impacting the DCR of lithium-ion batteries include environmental temperature, C-rate, and battery SOC. However, there is currently limited research that comprehensively analyzes the characteristics of battery DCR by considering these three factors.
Does battery discharge rate affect internal resistance?
For a variety of BTM technologies, the battery's internal resistance always plays a critical role in the heat generation rate of the battery. Many factors (temperature, SOC and discharge rate) impact on the internal resistance, however, scant research has explored the effect of battery discharge rate on the internal resistance.
Can HPPC test a lithium-ion battery's internal resistance?
An improved HPPC experiment on internal resistance is designed to effectively examine the lithium-ion battery's internal resistance under different conditions (different discharge rate, temperature and SOC) by saving testing time.