Effect of Current and SOC on Round-Trip Energy Efficiency of a Lithium-Iron Phosphate (LiFePO4) Battery Pack

2015 ◽  
Author(s):  
Michael Safoutin ◽  
Jeff Cherry ◽  
Joseph McDonald ◽  
SoDuk Lee
Keyword(s):  
Energy Efficiency ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Battery Pack ◽  
Round Trip ◽  
Lifepo4 Battery

Electrochemical lithium recovery with lithium iron phosphate: What causes performance degradation and how can we improve the stability?

2021 ◽  
Author(s):  
Lei Wang ◽  
Kathleen C Frisella ◽  
Pattarachai Srimuk ◽  
Oliver Janka ◽  
Guido Kickelbick ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Manganese Oxide ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
High Energy ◽  
Performance Degradation ◽  
Electrochemical Processes ◽  
High Energy Efficiency ◽  
The Stability

Electrochemical processes enable fast lithium extraction, for example, from brines, with high energy efficiency and stability. Lithium iron phosphate (LiFePO4) and manganese oxide (λ-MnO2) have usually been employed as the...

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 Lithium Iron Phosphate (LiFePO4) Battery Power System for Deepwater Emergency Operation

2017 ◽  
Vol 143 ◽  
pp. 348-353 ◽  
Author(s):  
W.D. Toh ◽  
B. Xu ◽  
J. Jia ◽  
C.S. Chin ◽  
J. Chiew ◽  
...  
Keyword(s):  
Power System ◽  
Lithium Iron Phosphate ◽  
Emergency Operation ◽  
Iron Phosphate ◽  
Battery Power ◽  
Lifepo4 Battery

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.

A One-class Classifier Based on a Hybrid Topology to Detect Faults in Power Cells

2021 ◽  
Author(s):  
Esteban Jove ◽  
José-Luis Casteleiro-Roca ◽  
Héctor Quintián ◽  
Francisco Zayas-Gato ◽  
Gianni Vercelli ◽  
...  
Keyword(s):  
Lithium Iron Phosphate ◽  
Real Data ◽  
Iron Phosphate ◽  
Hybrid Classifier ◽  
Hybrid Topology ◽  
General Terms ◽  
Real Value ◽  
One Class Classifier ◽  
Lifepo4 Battery ◽  
Operating Points

Abstract The use of batteries became essential in our daily life in electronic devices, electric vehicles and energy storage systems in general terms. As they play a key role in many devices, their design and implementation must follow a thorough test process to check their features at different operating points. In this circumstance, the appearance of any kind of deviation from the expected operation must be detected. This research deals with real data registered during the testing phase of a lithium iron phosphate—LiFePO4—battery. The process is divided into four different working points, alternating charging, discharging and resting periods. This work proposes a hybrid classifier, based on one-class techniques, whose aim is to detect anomalous situations during the battery test. The faults are created by modifying the measured cell temperature a slight ratio from their real value. A detailed analysis of each technique performance is presented. The average performance of the chosen classifier presents successful results.

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.

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