Correlation Between Changes in Environmental Temperature and Performance of High-Discharge Lithium-Polymer Batteries

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.

Ionic Conductivity and Dielectric Relaxations in Li+ Ions Doped Zinc Borate Glass System

“…The loss factor tan δ decreases at the upper-frequency range, hence the electrical loss is reduced. The semiconducting properties of the investigated glasses make them suitable for possible electronic device applications such as sensors, solid-state batteries, [52][53][54] super capacitors, etc.…”

Electrothermal Coupling Modeling and Electrothermal Dynamic Characteristics of Nickel-Cadmium Battery

“…The thermal conductivity of Ni-Cd batteries can be calculated by superimposing the relevant parameters of each component, as shown in equation (8).…”

“…At the same time, the temperature has a critical impact on the Ni-Cd battery state of charge [5], service life [6]. Therefore, it is crucial to study the electrothermal characteristics of Ni-Cd batteries, providing a basis for the design and effective control [7], [8].…”