Estimating state-of-charge imbalance of batteries using force measurements

2016 ◽  
Author(s):  
Youngki Kim ◽  
Nassim A. Samad ◽  
Ki-Yong Oh ◽  
Jason B. Siegel ◽  
Bogdan I. Epureanu ◽  
...  
Keyword(s):  
State Of Charge ◽  
Force Measurements ◽  
Charge Imbalance

On Improving Battery State of Charge Estimation Using Bulk Force Measurements

2015 ◽  
Author(s):  
Shankar Mohan ◽  
Youngki Kim ◽  
Anna G. Stefanopoulou
Keyword(s):  
Estimation Error ◽  
Lithium Ion ◽  
State Of Charge ◽  
Force Measurements ◽  
Voltage Measurement ◽  
Linear Quadratic ◽  
Bulk Force ◽  
Battery Packs ◽  
Battery State Of Charge ◽  
Li Ion

Lithium-ion (Li-ion) batteries undergo physical deformation as their state-of-charge (SOC) changes. The physical deformation causes changes in the pressure (equivalently, force) applied at the end-plates of a constrained battery pack or module. This paper proposes the fusion of bulk force and battery voltage measurements to estimate the SOC in Li-ion battery packs. In this paper, using discrete Linear Quadratic Estimators (dLQEs), the advantage of using force measurements in addition to voltage measurement to improve SOC estimates is quantitatively studied through simulations. It is observed that including force measurements can decrease the mean and standard deviation of SOC estimation error by 50% in some SOC intervals.

State of Charge Imbalance Estimation for Battery Strings Under Reduced Voltage Sensing

2015 ◽  
Vol 23 (3) ◽  
pp. 1052-1062 ◽  
Author(s):  
Xinfan Lin ◽  
Anna G. Stefanopoulou ◽  
Yonghua Li ◽  
R. Dyche Anderson
Keyword(s):  
State Of Charge ◽  
Voltage Sensing ◽  
Charge Imbalance

Casimir forces and vacuum energy

2017 ◽  
Author(s):  
Serge Reynaud ◽  
Astrid Lambrecht
Keyword(s):  
Casimir Force ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Thermal Fluctuations ◽  
Model Systems ◽  
Vacuum Field ◽  
Force Measurements ◽  
Casimir Forces ◽  
Current State ◽  
Field Fluctuations

The Casimir force is an effect of quantum vacuum field fluctuations, with applications in many domains of physics. The ideal expression obtained by Casimir, valid for perfect plane mirrors at zero temperature, has to be modified to take into account the effects of the optical properties of mirrors, thermal fluctuations, and geometry. After a general introduction to the Casimir force and a description of the current state of the art for Casimir force measurements and their comparison with theory, this chapter presents pedagogical treatments of the main features of the theory of Casimir forces for one-dimensional model systems and for mirrors in three-dimensional space.

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