Development and Validation of a Lithium-Ion Polymer Battery Cell Model for 12V SLI Battery Applications

2018 ◽  
Author(s):  
Yiqun Liu ◽  
Y. Gene Liao ◽  
Ming-Chia Lai
Keyword(s):  
Hybrid Electric Vehicle ◽  
Model Simulation ◽  
Cell Model ◽  
Lithium Ion ◽  
Constant Current ◽  
Model Parameters ◽  
Battery Cell ◽  
Runtime Prediction ◽  
Lithium Ion Polymer Battery ◽  
Polymer Battery

An intuitive and comprehensive lithium-ion polymer battery cell model is developed in the Simulink environment. The developed model has capability of transient function in the Thevenin-based model, AC-equivalent function in the impedance-based model, and runtime prediction in the runtime-based model. Several model parameters are determined through five experimental discharging currents (6.67A, 10A, 20A, 30A, and 40A). The model is correlated and validated with other three continuous discharging currents (4A, 15A, and 50A) and two pulse discharges (20A and 30A). The validation indicates a less than 7% discrepancy between model simulation and experiment. The model is currently effective for lithium-metal-oxides polymer battery cell with capacity between 18Ah and 22Ah (20Ah +/− 10%). For other capacity battery cell, the parameters of series resistors need to be adjusted in the model. These parameters can be determined using three to five continuous constant current discharging tests. It is intended to make the developed cell model scalable and accurate in a wider ranges of battery specifications. Expending the developed cell model to a 12 voltage Starting-Lighting-Ignition (SLI) battery used in the start-stop or 48 voltage battery pack for mild hybrid electric vehicle is an example.

Ambient Temperature Effect on Performance of a Lithium-Ion Polymer Battery Cell for 12-Voltage Applications

2019 ◽  
Author(s):  
Yiqun Liu ◽  
Y. Gene Liao ◽  
Ming-Chia Lai
Keyword(s):  
Ambient Temperature ◽  
Operating Temperature ◽  
Lithium Ion ◽  
Experimental Tests ◽  
Constant Current ◽  
Battery Cell ◽  
Ambient Temperatures ◽  
Nominal Voltage ◽  
Lithium Ion Polymer Battery ◽  
Polymer Battery

Abstract Operating temperature has a significant impact on the performance, safety, and cycle lifetime of the lithium-ion batteries. The operating temperature of a battery is the result of the ambient temperature augmented by the heat generated by the battery. This paper presents the empirical investigation of the effect of ambient temperature on the performance of a Lithium-Nickel-Manganese-Cobalt-Oxide based cell with 3.6V nominal voltage and 20Ah capacity. The experiments are carried out in an environment chamber using five controlled temperatures at −20°C, −10°C, 0°C, 20°C, and 50°C, as the ambient temperatures. In each controlled temperature test, a constant current (10A, 20A, and 40A) continuously discharge the cell to a cut-off 2.5V. The cell discharging voltages and usable capacities are the battery performance indicators. The experimental tests show that discharging voltage at 50% DOD and the total discharging time to reach 2.5V (usable capacity) increase as the ambient temperature increases. The modeling and simulation of a battery cell temperature model is built in the Simulink platform. The correlations show that simulated and experimental discharging curves match well in the 0–80% DOD range and the discrepancy is under 7%. The developed simulation model could provide thermal management guidelines for lithium-ion polymer battery applications in 12 voltage SLI, start-stop, and 48 voltage mild hybrid electric vehicles.

Investigation of lithium-ion polymer battery cell failure using X-ray computed tomography

2011 ◽  
Vol 13 (6) ◽  
pp. 608-610 ◽  
Author(s):  
V. Yufit ◽  
P. Shearing ◽  
R.W. Hamilton ◽  
P.D. Lee ◽  
M. Wu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Lithium Ion ◽  
Battery Cell ◽  
X Ray ◽  
X Ray Computed ◽  
Lithium Ion Polymer Battery ◽  
Polymer Battery

Coupled-Physics Modeling of a Lithium-Ion Battery Cylindrical Cell Microstructure

2012 ◽  
Author(s):  
Peter N. Doval ◽  
Ilya V. Avdeev
Keyword(s):  
Cross Section ◽  
Automotive Industry ◽  
Hybrid Electric Vehicle ◽  
Emerging Market ◽  
Lithium Ion ◽  
Functional Materials ◽  
Battery Pack ◽  
Cylindrical Shape ◽  
Fe Model ◽  
Battery Cell

Safety of consumer vehicles is an extremely important consideration for the automotive industry. An emerging market in the automotive industry today is the electric and hybrid-electric vehicle market. As environmental concerns grow, such vehicles will become a necessity for manufacturers to remain within increasingly stringent emissions regulations. A recent problem with the high-voltage lithium-ion batteries used in many of these vehicles is that of thermal runaway following a severe collision. This paper represents our early attempt to look at one aspect of this extensive project — a coupled-physics model of battery cell microstructure. In this case, couple-physics refers only to thermal-structural coupling and the microstructure being studied here is the laminate-level structure. A 2-D finite element model of a lithium-ion cell was therefore developed. This 2-D model of the cell, also called a jellyroll, is a cross-section cut of one cell within a battery pack. Each battery cell is an assembly of alternating thin sheets of functional materials (anode, separator and cathode), which are rolled into a cylindrical shape. The cross-section then takes the form of a layered spiral. The typical cell is made of an aluminum cathode with coating, copper anode with coating, and a non-linear, viscoelastic polymer separator. Once the 2-D jellyroll FE model was created, some initial structural element simulations were run to validate the geometry setup and model integrity. Next, thermal-structural coupled-field simulations were run to investigate stress propagation resulting from thermal loads as well as the same loading cases performed with the structural-only model. Different loading conditions, including uniaxial stress-strain state, hydrostatic pressure test, and thermo-mechanical loading were simulated. The results from the simulations performed in the project set the groundwork of future models involving electrical properties and models of 3-D cells and the full battery pack.

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