Abstract
Scientific and reasonable battery thermal management systems contribute to improve the performance of a power battery, prolong its life of service, and improve its safety. Based on TAFEL-LAE895 type 100Ah ternary lithium ion power battery, this paper is conducted on charging and discharging experiments at different rates to study the rise of temperature and the uniformity of the battery. Paraffin can be used to reduce the surface temperature of the battery, while expanded graphite (EG) is added to improve the thermal conductivity and viscosity of the composite phase change material (CPCM), and to reduce the fluidity after melting. With the increase of graphite content, the heat storage capacity of phase change material (PCM) decreases, which affects the thermal management effect directly. Therefore, this paper combines heat pipe and semiconductor refrigeration technology to transform heat from the inner CPCM to the thermoelectric cooling sheet for heat dissipation. The results show that the surface temperature of the battery can be kept within a reasonable range when discharging at high rate. The temperature uniformity of the battery is improved and the energy of the battery is saved.
Highlights
The lithium ion battery is widely used in electric vehicles due to the advantages of long lifespan, no memory effect, low self-discharge rate, and high energy density
The main purpose of research on electric vehicle battery thermal management system (BTMS) is to prevent the power battery from overheating or undercooling, so the temperature of the power battery is always maintained in the optimal working range to ensure the best performance of the electric vehicle
According to the different ratio of expanded graphite (EG) and paraffin wax (PW), they were made into composite phase change material (CPCM) block by 5%, 10%, 15%, and 20% to study its effect on battery thermal management performance
Summary
The lithium ion battery is widely used in electric vehicles due to the advantages of long lifespan, no memory effect, low self-discharge rate, and high energy density. Weixiong Wu et al [5,16,17], using an aged lithium ion phosphate battery as the research object for 5C discharge, proposed future work will include expanding discussion about thermal management characteristics, combining different heat-generating behavior and thermal resistance of the battery and PCM to study its influence. Based on the research above, this paper analyzed the influence of the content of thermally conductive particles (expanded graphite) in the phase change material on the thermal management of the battery It compared the effect which composite phase change material (CPCM) made by 0%, 5%, 10%, 15%, and 20% graphite content work in the battery thermal management system at different discharge rates and ambient temperatures, And combined with the thermoelectric cooling sheet to control temperature of the power battery. The best parameters of using composite phase change material and time of turning on the thermoelectric cooling sheet (TEC) in the thermal management system at different environmental temperatures was selected
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
