scholarly journals Analysis of Heat Dissipation and Preheating Module for Vehicle Lithium Iron Phosphate Battery

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6196
Author(s):  
Shuwen Zhou ◽  
Yuemin Zhao ◽  
Shangyuan Gao
Keyword(s):  
Ambient Temperature ◽  
Lithium Iron Phosphate ◽  
Great Influence ◽  
Iron Phosphate ◽  
Structure Design ◽  
Simulation Software ◽  
Battery Pack ◽  
Bottom Plate ◽  
Liquid Cooling ◽  
Cooling Performance

The ambient temperature has a great influence on the discharge and charging performance of a lithium battery, which may cause thermal runaway of the battery pack in extreme cases. In terms of the poor cooling effect caused by only using the cooling bottom plate for liquid cooling and the fact that the battery pack needs to be preheated before it can be used normally, a new cooling structure design was carried out, and a variety of cooling schemes and preheating schemes were proposed for analysis and comparison. The Star ccm+ simulation software was used to analyze and study their liquid cooling performance and preheating performance under different conditions. The best cooling scheme and preheating scheme were obtained by comparing the results of the simulation analysis. The simulation results show that the cooling performance of the cooling scheme using two vertical cooling plates and one cooling bottom plate is the best, and the preheating performance is best when the preheating liquid is used with a certain temperature flow through the preheating pipe of the battery pack for a period of time, and then the battery pack is discharged until the battery pack temperature reaches the working temperature range. The research results have reference value for the control of the ambient temperature of a vehicle lithium iron phosphate battery.

scholarly journals Material Characterization and Analysis on the Effect of Vibration and Nail Penetration on Lithium Ion Battery

2019 ◽  
Vol 10 (4) ◽  
pp. 69
Author(s):  
Ajeet Babu K. Parasumanna ◽  
Ujjwala S. Karle ◽  
Mangesh R. Saraf
Keyword(s):  
Surface Morphology ◽  
Lithium Iron Phosphate ◽  
Electrochemical Impedance ◽  
Dynamic Stiffness ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Internal Resistance ◽  
Chemical Degradation ◽  
Battery Pack ◽  
A Cell

Battery packaging in a vehicle depends on the cell chemistry being used and its behavior plays an important role in the safety of the entire battery pack. Chemical degradation of various parts of a cell such as the cathode or anode is a concern as it adversely affects performance and safety. A cell in its battery pack once assembled can have two different mechanical abuse condition. One is the vibration generated from the vehicle and the second is the intrusion of external elements in case of accident. In this paper, a commercially available 32,700 lithium ion cell with lithium iron phosphate (LFP) chemistry is studied for its response to both the abuse conditions at two different states of charge (SoC). The primary aim of this study is to understand their effect on the surface morphology of the cathode and the anode. The cells are also characterized to study impedance behavior before and after being abused mechanically. The cells tested for vibration were also analyzed for dynamic stiffness. A microscopy technique such as scanning electron microscopy (SEM) was used to study the surface morphology and electrochemical impedance spectroscopy (EIS) characterization was carried out to study the internal resistance of the cell. It was observed that there was a drop in internal resistance and increase in the stiffness after the cells subjected to mechanical abuse. The study also revealed different morphology at the center and at the corner of the cell subjected to nail penetration at 50% SoC.

scholarly journals Temperature Control to Reduce Capacity Mismatch in Parallel-Connected Lithium Ion Cells

2019 ◽  
Author(s):  
Mayank Garg ◽  
Tanvir R. Tanim ◽  
Christopher D. Rahn ◽  
Hanna Bryngelsson ◽  
Niklas Legnedahl
Keyword(s):  
Temperature Control ◽  
Current Distribution ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Premature Aging ◽  
Battery Pack ◽  
Different Temperatures ◽  
Uniform Current

Abstract The temperature and capacity of individual cells affect the current distribution in a battery pack. Non uniform current distribution among parallel-connected cells can lead to capacity imbalance and premature aging. This paper develops models that calculate the current in parallel-connected cells and predict their capacity fade. The model is validated experimentally for a nonuniform battery pack at different temperatures. The paper also proposes and validates the hypothesis that temperature control can reduce capacity mismatch in parallel-connected cells. Three Lithium Iron Phosphate cells, two cells at higher initial capacity than the third cell, are connected in parallel. The pack is cycled for 1500 Hybrid Electric Vehicles cycles with the higher capacity cells regulated at 40°C and the lower capacity cell at 20°C. As predicted by the model, the higher capacity and temperature cells age faster, reducing the capacity mismatch by 48% over the 1500 cycles. A case study shows that cooling of low capacity cells can reduce capacity mismatch and extend pack life.

scholarly journals Optimization of Thermal Management System with Water and Phase Change Material Cooling for Li-Ion Battery Pack

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5312
Author(s):  
Quanyi Li ◽  
Jong-Rae Cho ◽  
Jianguang Zhai
Keyword(s):  
Service Life ◽  
Thermal Management ◽  
Flow Rate ◽  
Battery Pack ◽  
Liquid Cooling ◽  
Cooling Performance ◽  
Cooling Pipe ◽  
Thermal Management System ◽  
Battery Packs ◽  
Change Material

The cooling structure of a battery pack and coupled liquid cooling and phase change material (PCM) were designed in a thermal management system to enhance the cooling performance and extend the service life of lithium-ion battery packs. Numerical simulations were conducted based on the finite volume method. This study focuses on factors such as the layout of the terminal, flow rate of the coolant, different sections of the cooling pipe, position of the cooling pipe, and coupled liquid cooling, and investigates their influences on the operating temperature. The results show that a reasonable terminal layout can reduce heat generation inside the batteries. The appropriate flow rate and position of the cooling pipe effectively reduced the maximum temperature and minimized energy consumption. Then, the PCM was placed between the adjacent batteries near the outlet to enhance the uniformity of the battery pack. The temperature difference was reduced to near 5 K. This study provides a clear direction for improving the cooling performance and extending the service life of battery packs.

scholarly journals Characteristic research on lithium iron phosphate battery of power type

2018 ◽  
Vol 185 ◽  
pp. 00004
Author(s):  
Yen-Ming Tseng ◽  
Hsi-Shan Huang ◽  
Li-Shan Chen ◽  
Jsung-Ta Tsai
Keyword(s):  
Lithium Iron Phosphate ◽  
High Capacity ◽  
Iron Phosphate ◽  
Internal Resistance ◽  
Battery Pack ◽  
Electrical Characteristics ◽  
Power Type ◽  
Temperature Environment ◽  
Characteristics Analysis ◽  
Current Value

In this paper, it is the research topic focus on the electrical characteristics analysis of lithium phosphate iron (LiFePO4) batteries pack of power type. LiFePO4 battery of power type has performance advantages such as high capacity, lower toxicity and pollution, operation at high temperature environment and many cycling times in charging and discharge and so on. The charging and discharging characteristics for LiFePO4 batteries of power type pack have been verified and discussed by the actual experiment. Base on the 12V10AH LiFePO4 battery was proceeding on charging and discharging test with over high current value and which investigate the parameters such as the internal resistance, the related charge and discharge characteristics of LiFePO4 battery pack, the actual value of internal voltage and internal resistance of the battery pack and by polynomial mathmatic model to approach the accury of inner resistance on discharging mode.

scholarly journals Influence of Operation Conditions on Temperature Hazard of Lithium-Iron-Phosphate (LiFePO4) Cells

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6728
Author(s):  
Wojciech Kurpiel ◽  
Bartosz Polnik ◽  
Łukasz Orzech ◽  
Krzysztof Lesiak ◽  
Bogdan Miedziński ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Ambient Temperature ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Test Results ◽  
Operation Conditions ◽  
Mining Conditions ◽  
Charging Current ◽  
Practical Recommendations

The article presents and discusses the results of research on hazard, especially temperature, for selected lithium-ion-phosphate cells operated in accordance with the manufacturer’s recommendations but used under onerous mining conditions. This applies to the performance of cells in battery sets without the application of any management system (BMS). On the basis of the obtained test results, first of all, the influence of the value of the charging current of cells and the ambient temperature for both free and deteriorated heat exchange, appropriate conclusions and practical recommendations were formulated. This applies especially to threats in the case of random, cyclic, minor overloading, and discharging of the cells.

scholarly journals Research on the Capacity of Li-ion Battery Packer Based on Capacity Incremental Curve

2021 ◽  
Vol 237 ◽  
pp. 02018
Author(s):  
Yu Tian ◽  
Zhengyuan Zhu ◽  
Shuangyu Liu ◽  
Dongpei Qian ◽  
Xiao Yan ◽  
...  
Keyword(s):  
Single Cell ◽  
Electric Vehicles ◽  
Lithium Iron Phosphate ◽  
Characteristic Point ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Battery Pack ◽  
Analysis Tool ◽  
In Series ◽  
Battery Technology

Lithium ion battery is the most widely used and reliable power source for electric vehicles. With the development of electric vehicles, the safety, energy density, life and reliability of lithium ion batteries have been continuously improved. However, in the field of vehicle power battery technology, battery monomers are combined in series and parallel to provide enough energy, but one of the major problems faced by group batteries is the consistency between battery monomers. Taking the capacity increment curve (IC curve) of lithium iron phosphate battery as the analysis tool, it is found that the characteristic peak of IC curve of different monomers in battery pack can reflect the relationship of monomer capacity. On this basis, the mathematical model is established, and the IC curve II peak characteristic point of a single cell are used as the reference to characterize the capacity of the single cell one by one. The results show that the method can be used in the normal charging process of the battery pack, and the capacity of the single cell in the battery pack can be characterized in real time during the whole life of the battery pack. It has certain research value for the ladder utilization and accurate management of battery pack.

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