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Energies 2017,10, 1503
2.3.3.Open-WireFaultDiagnosis
In themulti-cellLIBpack, thevoltageofeachcellneeds tobemonitored inreal-time. Inaddition,
battery-cell balancing is required for thecells that areunbalanced, that is,when theSOCofoneor
more cells areunequal. Therefore, there aren+1 (n is the cell number in thebatterypack)wires
from the cells to the balancing board. It is often difficult to ensure that all thewires are always
connectedproperlyduringtheactualoperation. Someof thewiresmaybe looseordisconnecteddue
to frequency impactorvibration fromthemechanical structure thatencloses thecells. Thefloating
voltageof theLTC6804 inputpinswillbearound0,orhigher than5Vwhentheopen-wirecondition
occurs. Basedonthefloating-voltagesensor, the fault-diagnosis strategy isproposedtodiagnose the
open-wire fault. The failurewillbedisplayedvia thegraphical-user-interface (GUI) toalert theuserof
the fault that requiresattention. In thiscase, it isnotpossible toautomaticallyconnect thewire,as it
will requirehumaninvolvement. Theflowchartof thediagnosis strategycanbeseen inFigure7.
Figure7.Flowchartofopen-wire faultdiagnosis strategy.
Adual-entrance interface isdesigned fordifferentusers toconfigure thesystemfor the initial
use. Severaldefaultparameters forvariousbatterieshavebeenstored in thesystemmemoryforease
ofoperation. Theordinaryusersdonothavetoworryabout theexactvalues. Instead, theyneedto
select the typesofbatteries, thebattery-packgrouping information, thebattery-cell rated capacity
andthemaximumdischargingcurrent. Thesystemwill automatically initialize thecorresponding
parameters according to the informationprovided. Currently, four lithiumbattery types, such as
LiFePO4,Li-ion,LiCoO2andlithiumpolymers,aresupported in theproposedsystem. Inaddition,
the systemhas anoption to customize theparameter values such asprotection-voltage level and
charging- or discharging-current limitation for further analysis. The entrance design for system
parameterconfiguration isdescribed inFigure8.
Figure8.Entrancedesignforsystemparameterconfiguration.
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Emerging Technologies for Electric and Hybrid Vehicles
- Title
- Emerging Technologies for Electric and Hybrid Vehicles
- Editor
- MDPI
- Location
- Basel
- Date
- 2017
- Language
- English
- License
- CC BY-NC-ND 4.0
- ISBN
- 978-3-03897-191-7
- Size
- 17.0 x 24.4 cm
- Pages
- 376
- Keywords
- electric vehicle, plug-in hybrid electric vehicle (PHEV), energy sources, energy management strategy, energy-storage system, charging technologies, control algorithms, battery, operating scenario, wireless power transfer (WPT)
- Category
- Technik