Abstract
Lithium-ion battery (LIB) power systems have been commonly used for energy storage in electric vehicles. However, it is quite challenging to implement a robust real-time fault diagnosis and protection scheme to ensure battery safety and performance. This paper presents a resilient framework for real-time fault diagnosis and protection in a battery-power system. Based on the proposed system structure, the self-initialization scheme for state-of-charge (SOC) estimation and the fault-diagnosis scheme were tested and implemented in an actual 12-cell series battery-pack prototype. The experimental results validated that the proposed system can estimate the SOC, diagnose the fault and provide necessary protection and self-recovery actions under the load profile for an electric vehicle.
Highlights
As one of many energy storage solutions, lithium-ion batteries (LIBs) are attracting more and more attention from researchers and users due to their high energy density, high power density, long lifespan and environmental friendliness [1,2]
The proposed smart LIB system is implemented as a 12-cell series LIB-pack prototype to test
The proposed smart LIB system is implemented as a 12-cell series LIB-pack prototype to test the Results the fault-detection and diagnosis algorithms, as shown earlier
Summary
As one of many energy storage solutions, lithium-ion batteries (LIBs) are attracting more and more attention from researchers and users due to their high energy density, high power density, long lifespan and environmental friendliness [1,2]. The LIBs have been used in energy-storage applications in solar panel systems from those that use a few kilowatt-hours in residential systems to multi-megawatt batteries in grid power systems. There are broad applications in some high-power applications such as electric vehicles using large numbers of serial or parallel battery cells [3,4,5,6,7,8]. The safety of the LIB power system is crucial, especially when the battery-power system is grouped by a considerable number of battery cells in serial or parallel topology, or in a battery stack, to give a higher power density. The LIBs can deteriorate if they are to operate beyond the battery specifications [9,10]
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