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Fast and accurate estimation of battery state of charge (SOC) is a key technology in the battery management system. Based on the non-linear response characteristics of lithium batteries, an adaptive Kalman filter algorithm is put forward in this paper. It is known that the battery model parameters vary with SOC, battery temperature and battery aging. Moreover, the relationship between open circuit...
Despite best efforts, integrated systems are “born” (manufactured) with a unique ‘personality’ that stems from our inability to precisely fabricate their underlying circuits, and create software a priori for controlling the resulting uncertainty. It is possible to use sophisticated test methods to identify the best-performing systems but this would result in unacceptable yields and correspondingly...
This work presents an electrical equivalent circuit model for plug-in (hybrid) electric vehicles. The model features ageing dependent parameter adaption to facilitate the simulation of ageing influences on batteries. An ageing approach based on Arrhenius' law for the standstill time and a cubic equation for transfered charge was used for making the model capable of vehicle simulations with high percentages...
The battery pack lifetime is severely affected by the State-of-Charge (SOC) and thermal imbalance among its cells, which is inevitable in large automotive batteries. In this review paper, the need of simultaneous thermal and SOC balancing is emphasized. Thermal and SOC balancing are two tightly coupled objectives. However, we argue here that it is possible to achieve these simultaneously by using...
Due to the inconsistency and varied characteristics of lithium-ion battery cells, the battery pack modeling remains a challenging problem. To model the operation behaviors of each cell in the battery pack, considerable work effort and computation time is needed. This paper proposes a data-driven bias correction based lithium-ion battery modeling method, which can significantly reduce the computation...
A second-life battery is an electric vehicle battery pack that has reached an end-of-life condition for its vehicular use, yet retains enough performance to be re-purposed for another application. One promising application of a second-life battery is stationary energy storage within a CERTS microgrid. This paper investigates the modeling of multiple paralleled traction battery packs within a CERTS...
Rechargeable batteries as an energy source in electric vehicles (EVs), hybrid electric vehicles (HEVs) and smart grids are receiving more attention with the worldwide demand for reduction of greenhouse gas emission. In all of these applications for secondary batteries, the battery management system (BMS) needs to have an accurate inline estimation of state of charge (SOC) of each individual cell in...
In this paper we present a design for reliability methodology, with the goal of reducing the impact of transistor VTH degradation due for example to phenomena such as NBTI. It uses infrastructure IPs (I-IPs) featuring a self compensation scheme that automatically detects transistor aging effects and illustrates the design for test infrastructure used to make the SoC/System aware of the NBTI effects...
Advancements in technology enable integration of a large number of cores on a single silicon die. At the same time, aggressive technology scaling has an ever-increasing adverse impact on the lifetime reliability of such large integrated circuits. In this work, we model the lifetime reliability of homogeneous manycore systems using a load-sharing nonrepairable k-out-of-n:G system with general failure...
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