Abstract
Towards the end to solve the problem of temperature rise in the power battery of electric vehicles, a method based on the coupling of electrochemical, thermal and hydrodynamic aspects is implemented. The method relies on the COMSOL Multiphysics software, which is used here to simulate the thermal behaviour, the related fluid-dynamics and the life attenuation of the power battery. A 3D battery model is built assuming a cylindrical geometry. The diameter of the battery is 18 mm, and its length is 65 mm. The battery charges and discharges at 3C, and the initial temperature is 25°C. Intake flow is set to 0.5 m/s after the air of the battery is cooled. The results show that: (1) The highest temperature of the battery unit increases significantly from 1.14°C of the original nylon heat pipe to 0.17°C of the hot pipe core shaft; (2) When the short circuit of the battery is simulated, the temperature rise of the single battery is close to 20°C, the minimum rise is about 12°C, and their difference reaches 8°C.
Highlights
Electric vehicles have the advantages of low energy consumption and non-exhaust emission, and they have obvious advantages in energy-saving and protecting the urban environment from pollution
When the temperature is below 25°C, the decay rate increases with the decrease of temperature, and the decay rate above 25°C increases with the decrease of temperature [1]
2.1 Principle and Structure of Power Battery A Li-ion Battery is a kind of high-efficiency recyclable battery, which mainly depends on the insertion and removal of lithium ions between the positive and negative electrodes in the battery to complete the charge and discharge [5]
Summary
Electric vehicles have the advantages of low energy consumption and non-exhaust emission, and they have obvious advantages in energy-saving and protecting the urban environment from pollution. Waldman studied the decay law of 18650 batteries at −20°C to 70°C. The results show that the decay range at −20°C to 25°C is completely different from that at 25°C to 70°C. It is necessary to study the heat production and heat transfer characteristics of electric vehicle power cells and the Influence of temperature on the performance of the batteries. Research on the cooling mechanism of the power battery can improve the durability of electric vehicles on driving. Computational fluid dynamics has achieved great success. It has great significance to develop and improve the power battery and its thermal management system [4]. The heat transfer characteristics of a single battery are studied to better improve the heat dissipation and the service life of power batteries
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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
