Abstract
Electric vehicles (EVs) have been developed to solve environmental problems and the depletion of energy resources, and batteries have been used as their main energy source. The battery used in this study was a lithium polymer battery with the same chemical structure as lithium-ion. The use of a solid electrolyte has advantages, such as lack of leakage of electrolyte, high density per size, and convenient shape design. In this study, we analyzed the heat generation and performance characteristics of EV batteries through experiments on changes in environmental temperature. There is a difference in the heat generation depending on the discharge rate, and the performance characteristics of the battery improves as the environmental temperature rises. In the experiment, the battery discharge performance and heat generation were meaningful at 40°C environmental temperature, the worst battery discharge performance and heat generation at −30°C environmental temperature were 25.1 W (1 C), 81.0 W (2 C), and 151.5 W (3 C). In this study, the heat generation and performance characteristics of the battery were analyzed according to the change in the environmental temperature and discharge rate of the battery. We proposed a relationship between heat generation and environmental temperature in terms of discharge rate. The relationship is significant in designing thermal management system for battery powered devices.
Highlights
Electric vehicles (EVs), hybrid EVs, and plug-in hybrid EVs are gradually being developed because of the depletion of energy resources and increasing environmental pollution worldwide
They numerically studied and proposed a delayed cooling system coupling composite phase change material (CPCM) and nano phase change material emulsion (NPCME) to improve the working performance of LIBs under long-term charge–discharge cycles. They suggested that the NPCME/CPCM system can control the maximum temperature change with improved cooling performance and a lower flow rate than the conventional hybrid water/ CPCM system under optimal operating conditions (Cao et al, 2021). They proposed a thermal management method for a novel battery module involving an integrated design of PCM and cooling plate to prevent heat propagation and thermal runaway in a battery module made of 18,650 cells that have been damaged by nail penetration of up to three cells (Kshetrimayum et al, 2019)
The following conclusions were drawn through experiments based on the changes in the environmental temperature and discharge rate of high-discharge lithiumpolymer batteries
Summary
Electric vehicles (EVs), hybrid EVs, and plug-in hybrid EVs are gradually being developed because of the depletion of energy resources and increasing environmental pollution worldwide It is necessary to maximize the efficiency of various cooling methods through the application of data on the electrical performance and heat generation of the battery in various environmental temperatures They investigated the modeling and analysis of a battery module to improve the thermal performance of the LIBs in EVs with phase change materials (PCMs). They suggested that the NPCME/CPCM system can control the maximum temperature change with improved cooling performance and a lower flow rate than the conventional hybrid water/ CPCM system under optimal operating conditions (Cao et al, 2021) They proposed a thermal management method for a novel battery module involving an integrated design of PCM and cooling plate to prevent heat propagation and thermal runaway in a battery module made of 18,650 cells that have been damaged by nail penetration of up to three cells (Kshetrimayum et al, 2019). As for the test method, the battery was fully charged with a Constant Current (CC), and when the temperature of the battery was adjusted by setting the environmental temperature, the discharge experiment was performed from
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
