Thermal–Electrochemical simulation of electrochemical characteristics and temperature difference for a battery module under two-stage fast charging

2020 ◽  
Vol 29 ◽  
pp. 101307 ◽  
Author(s):  
Jialin Liang ◽  
Yunhua Gan ◽  
Weifeng Song ◽  
Meixian Tan ◽  
Yong Li
Keyword(s):  
Temperature Difference ◽  
Electrochemical Characteristics ◽  
Two Stage ◽  
Fast Charging ◽  
Electrochemical Simulation ◽  
Battery Module

Simulation and Optimization of Temperature Field of Tank Cover with Super Large Diameter during the Creep Aging Forming Process

2021 ◽  
Vol 315 ◽  
pp. 3-9
Author(s):  
Yuan Gao ◽  
Li Hua Zhan ◽  
Hai Long Liao ◽  
Xue Ying Chen ◽  
Ming Hui Huang
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
Temperature Difference ◽  
Single Stage ◽  
Maximum Temperature ◽  
Heating Process ◽  
Temperature Field Distribution ◽  
Two Stage ◽  
Maximum Temperature Difference ◽  
Forming Accuracy

The uniformity of temperature field distribution in creep aging process is very important to the forming accuracy of components. In this paper, the temperature field distribution of 2219 aluminum alloy tank cover during aging forming is simulated by using the finite element software FLUENT, and a two-stage heating process is proposed to reduce the temperature field distribution heterogeneity. The results show that the temperature difference of the tank cover is large in the single-stage heating process, and the maximum temperature difference is above 27°C,which seriously affects the forming accuracy of the tank cover. With two-stage heating process, the temperature difference in the first stage has almost no direct impact on the forming accuracy of the top cover. In the second stage, the temperature difference of the tank cover is controlled within 10°C, compared with the single-stage heating, the maximum temperature difference is reduced by more than 17°C. The two-stage heating effectively reduces the heterogeneity of the temperature field of the top cover. The research provides technical support for the precise thermal mechanical coupling of large-scale creep aging forming components.

scholarly journals Transient Thermal Analysis of a Li-Ion Battery Module for Electric Cars Based on Various Cooling Fan Arrangements

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2387
Author(s):  
Van-Thanh Ho ◽  
Kyoungsik Chang ◽  
Sang Wook Lee ◽  
Sung Han Kim
Keyword(s):  
Temperature Difference ◽  
Cooling System ◽  
Maximum Temperature ◽  
Clear Understanding ◽  
Li Ion Battery ◽  
Discharge Condition ◽  
Battery Cell ◽  
Electric Cars ◽  
Li Ion ◽  
Battery Module

This paper presents a three-dimensional modeling approach to simulate the thermal performance of a Li-ion battery module for a new urban car. A single-battery cell and a 52.3 Ah Li-ion battery module were considered, and a Newman, Tiedemann, Gu, and Kim (NTGK) model was adopted for the electrochemical modeling based on input parameters from the discharge experiment. A thermal–electrochemical coupled method was established to provide insight into the temperature variations over time under various discharge conditions. The distribution temperature of a single-battery cell was predicted accurately. Additionally, in a 5C discharge condition without a cooling system, the temperature of the battery module reached 114 °C, and the temperature difference increased to 25 °C under a 5C discharging condition. This condition led to the activation of thermal runaway and the possibility of an explosion. However, the application of a reasonable fan circulation and position reduced the maximum temperature to 49.7 °C under the 5C discharge condition. Moreover, accurate prediction of the temperature difference between cell areas during operation allowed for a clear understanding and design of an appropriate fan system.

scholarly journals Two-stage fast charging method using dual-switch flyback converter

2019 ◽  
Vol 156 ◽  
pp. 366-370 ◽  
Author(s):  
Chih-Chiang Hua ◽  
Zong-Xian Lin
Keyword(s):  
Two Stage ◽  
Flyback Converter ◽  
Fast Charging

Development of integrated two-stage thermoelectric generators for large temperature difference

2019 ◽  
Vol 62 (9) ◽  
pp. 1596-1604 ◽  
Author(s):  
Jun Pei ◽  
LiangLiang Li ◽  
DaWei Liu ◽  
BoPing Zhang ◽  
Yu Xiao ◽  
...  
Keyword(s):  
Temperature Difference ◽  
Large Temperature ◽  
Thermoelectric Generators ◽  
Two Stage ◽  
Large Temperature Difference

scholarly journals Two Stage Evaporative Cooling of Residential Building Using Geothermal Energy

2019 ◽  
Vol 25 (4) ◽  
pp. 29-44
Author(s):  
Ali Hammoodi Mahdi Alhosainy ◽  
Issam Mohammed Ali Aljubury
Keyword(s):  
Groundwater Flow ◽  
Temperature Difference ◽  
Geothermal Energy ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Residential Building ◽  
Two Stage ◽  
Second Stage ◽  
Direct Evaporative Cooling ◽  
Evaporative Cooling System

The weather of Iraq has longer summer season compared with other countries. The ambient temperature during this season reaches over 50 OC which makes the evaporative cooling system suitable for this climate. In present work, the two-stage evaporative cooling system is studied. The first stage is indirect evaporative cooling (IEC) represented by two heat exchangers with the groundwater flow rate (5 L/min). The second stage is direct evaporative cooling (DEC) which represents three pads with groundwater flow rates of (4.5 L/min). The experimental work was conducted in July, August, September, and October in Baghdad. Results showed that overall evaporative efficiency of the system (two coils with three pads each pad of 3cm) reach to 167 % with the temperature difference between ambient and supply is 26.2oC. While it reached 122.7% (one coil with three pads ) with the temperature difference between ambient and supply is 16OC and reduced to 84.88% and 84.36% for IEC and DEC respectively.  

scholarly journals An Adaptive Rapid Charging Method for Lithium-Ion Batteries with Compensating Cell Degradation Behavior

2018 ◽  
Vol 8 (8) ◽  
pp. 1251 ◽  
Author(s):  
Dong-Rak Kim ◽  
Jin-Wook Kang ◽  
Tae-Ho Eom ◽  
Jun-Mo Kim ◽  
Jeong Lee ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Lithium Ion ◽  
Cycle Life ◽  
Degradation Behavior ◽  
Cycle Number ◽  
Cell Life ◽  
Fast Charging ◽  
Recent Developments ◽  
Preliminary Study ◽  
Battery Module

Recent developments in high-density lithium-ion battery technologies have greatly expanded the electric vehicle (EV) market. Due to the fact that the rapid charging of an EV battery pack while maintaining a suitable cell cycle life is necessary for further growth of the EV market, we herein propose an innovative adaptive rapid charging pattern that minimizes cell degradation and reflects the degradation characteristics. This technology is advantageous in that cells can be developed by analyzing the charging characteristics in the latter stages of cell development of the rapid charging pattern, while also considering the complexity and heterogeneity of the manufacturing process. Furthermore, the battery charging pattern is optimized and controlled in real-time by reflecting the characteristics of the battery module and pack degradation as the cycle number is increased. More specifically, we present a preliminary study that simplifies the implementation of the new optimization pattern to improve the cell cycle life by over 45% in comparison to conventional fast charging patterns, and to address the drop in capacity in the latter half of cell life during rapid charging.

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