A novel capacity and initial discharge electric quantity estimation method for LiFePO4 battery pack based on OCV curve partial reconstruction

Energy ◽  
2021 ◽  
pp. 122882
Author(s):  
Jinlei Sun ◽  
Yong Tang ◽  
Jilei Ye ◽  
Tao Jiang ◽  
Saihan Chen ◽  
...  
Keyword(s):  
Estimation Method ◽  
Battery Pack ◽  
Partial Reconstruction ◽  
Initial Discharge ◽  
Lifepo4 Battery ◽  
Electric Quantity

A nonlinear fractional-order H∞ observer for SOC estimation of battery pack of electric vehicles

2021 ◽  
pp. 095440702199434
Author(s):  
Wei Yue ◽  
Cong-zhi Liu ◽  
Liang Li ◽  
Xiang Chen ◽  
Fahad Muhammad
Keyword(s):  
Fractional Order ◽  
Estimation Method ◽  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
Open Circuit ◽  
Design Criterion ◽  
Observer Design ◽  
Nonlinear Observer ◽  
Battery Pack ◽  
Soc Estimation

This work is focused on designing a fractional-order [Formula: see text] observer and applying it into the state of charge (SOC) estimation for lithium-ion battery pack system. Firstly, a fractional order equivalent circuit model based on the fractional capacitor is established and identified. Secondly, the SOC estimation method based on the fractional-order [Formula: see text] observer is proposed. The nonlinear intrinsic relationship between the open-circuit voltage and SOC is described as a polynomial function, and its Lipschitz proposition has been discussed. Then, the nonlinear observer design criterion is established based on the Lyapunov method. Finally, the effectiveness of the proposed method is verified with high accuracy and robustness by the experiment results.

scholarly journals A New State of Charge Estimation Method for LiFePO4 Battery Packs Used in Robots

Energies ◽  
2013 ◽  
Vol 6 (4) ◽  
pp. 2007-2030 ◽  
Author(s):  
Ming-Hui Chang ◽  
Han-Pang Huang ◽  
Shu-Wei Chang
Keyword(s):  
Estimation Method ◽  
State Of Charge ◽  
Battery Packs ◽  
Lifepo4 Battery ◽  
State Of Charge Estimation

scholarly journals Wireless Battery Charging Circuit Using Load Estimation Without Wireless Communication

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4489
Author(s):  
Lee ◽  
Choi ◽  
Kim ◽  
Kang
Keyword(s):  
Wireless Communication ◽  
Estimation Method ◽  
Load Resistance ◽  
Battery Pack ◽  
Constant Current ◽  
Estimation Methods ◽  
Load Estimation ◽  
Output Current ◽  
Battery Charging ◽  
Transmitter Coil

A wireless battery charging circuit is proposed, along with a new load estimation method. The proposed estimation method can predict the load resistance, mutual inductance, output voltage, and output current without any wireless communication between the transmitter and receiver sides. Unlike other estimation methods that sense the high-frequency AC voltage and current of the transmitter coil, the proposed method only requires the DC output value of the peak current detection circuit at the transmitter coil. The proposed wireless power transfer (WPT) circuit uses the estimated parameters, and accurately controls the output current and voltage by adjusting the switching phase difference of the transmitter side. The WPT prototype circuit using a new load estimation method was tested under various coil alignment and load conditions. Finally, the circuit was operated in a constant current and constant voltage modes to charge a 48-V battery pack. These results show that the proposed WPT circuit that uses the new load estimation method is well suited for charging a battery pack.

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