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Thermal Management of Large-Format Prismatic Lithium-Ion Battery in PHEV Application
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.ORCID iD: 0000-0003-2112-6115
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
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2016 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 163, no 2, A309-A317 p.Article in journal (Refereed) PublishedText
Abstract [en]

Thermal effects are linked to all main barriers to the widespread commercialization of lithium-ion battery powered vehicles. This paper presents a coupled 2D electrochemical - 3D thermal model of a large-format prismatic lithium-ion battery, including a thermal management system with a heat sink connected to the surface opposite the terminals, undergoing the dynamic current behavior of a plug-in hybrid electric (PHEV) vehicle using a load cycle with a maximum current of 8 C, validated using potential and temperature data. The model fits the data well, with small deviations at the most demanding parts of the cycle. The maximum temperature increase and temperature difference of the jellyroll is found to be 9.7 degrees C and 3.6 degrees C, respectively. The electrolyte is found to limit the performance during the high-current pulses, as the concentration reaches extreme values, leading to a very uneven current distribution. Two other thermal management strategies, short side and long side surfaces cooling, are evaluated but are found to have only minor effects on the temperature of the jellyroll, with maximum jellyroll temperatures increases of 9.4 degrees C and 8.1 degrees C, respectively, and maximum temperature differences of 3.7 degrees C and 5.0 degrees C, respectively.

Place, publisher, year, edition, pages
Electrochemical Society, 2016. Vol. 163, no 2, A309-A317 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-180974DOI: 10.1149/2.09411602jesISI: 000367324400040ScopusID: 2-s2.0-84949599677OAI: oai:DiVA.org:kth-180974DiVA: diva2:898585
Note

Updated from Manuscript to Article. QC 20160202

Available from: 2016-01-28 Created: 2016-01-26 Last updated: 2016-02-02Bibliographically approved
In thesis
1. Thermal Aspects and Electrolyte Mass Transport in Lithium-ion Batteries
Open this publication in new window or tab >>Thermal Aspects and Electrolyte Mass Transport in Lithium-ion Batteries
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Temperature is one of the most important parameters for the performance, safety, and aging of lithium-ion batteries and has been linked to all main barriers for widespread commercial success of electric vehicles.

The aim of this thesis is to highlight the importance of temperature effects, as well as to provide engineering tools to study these.

The mass transport phenomena of the electrolyte with LiPF6  in EC:DEC was fully characterized in between 10 and 40 °C and 0.5 and 1.5 M, and all mass transport properties were found to vary strongly with temperature.

A superconcentrated electrolyte with LiTFSI in ACN was also fully characterized at 25 °C, and was found to have very different properties and interactions compared to LiPF6  in EC:DEC.

The benefit of using the benchmarking method termed electrolyte masstransport resistivity (EMTR) compared to using only ionic conductivity was illustrated for several systems, including organic liquids, ionic liquids, solid polymers, gelled polymers, and electrolytes containing flame-retardant additives.

TPP, a flame-retardant electrolyte additive, was evaluated using a HEV load cycle and was found to be unsuitable for high-power applications such as HEVs.

A large-format commercial battery cell with a thermal management system was characterized using both experiments and a coupled electrochemical and thermal model during a PHEV load cycle. Different thermal management strategies were evaluated using the model, but were found to have only minor effects since the limitations lie in the heat transfer of the jellyroll.

Abstract [sv]

Temperatur är en av de viktigaste parametrarna gällande ett litiumjonbatteris prestanda, säkerhet och åldring och har länkats till de främsta barriärerna för en storskalig kommersiell framgång för elbilar.

Syftet med den här avhandlingen är att belysa vikten av temperatureffekter, samt att bidra med ingenjörsverktyg att studera dessa.

Masstransporten för elektrolyten LiPF6  i EC:DEC karakteriserades fullständigt i temperaturintervallet 10 till 40 °C för LiPF6-koncentrationer på 0.5 till 1.5 M. Alla masstransport-egenskaper fanns variera kraftigt med temperaturen.

Den superkoncentrerade elektrolyten med LiTFSI i ACN karakteriserades även den fullständigt vid 25 °C. Dess egenskaper och interaktioner fanns vara väldigt annorlunda jämfört med LiPF6  i EC:DEC.

Fördelen med att använda utvärderingsmetoden elektrolytmasstransportresistivitet (EMTR) jämfört med att endast mäta konduktivitet illustrerades för flertalet system, däribland organiska vätskor, jonvätskor, fasta polymerer, gellade polymerer, och elektrolyter

med flamskyddsadditiv.

Flamskyddsadditivet TPP utvärderades med en hybridbils-lastcykel och fanns vara olämplig för högeffektsapplikationer, som hybridbilar.

Ett kommersiellt storformatsbatteri med ett temperatur-kontrollsystem karakteriserades med b.de experiment och en kopplad termisk och elektrokemisk modell under en lastcykel utvecklad för plug-inhybridbilar. Olika strategier för kontroll av temperaturen utvärderades, men fanns bara ha liten inverkan på batteriets temperatur då begränsningarna för värmetransport ligger i elektrodrullen, och inte i batteriets metalliska ytterhölje.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 60 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:22
Keyword
Energy storage, Lithium-ion batteries, Electrolytes, Temperature, Modeling, Hybrid electric vehicle, Plug-in hybrid electric vehicle
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-166857 (URN)978-91-7595-584-1 (ISBN)
Public defence
2015-06-11, D2, Lindstedtsvägen 5, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
Swedish Hybrid Vehicle Center
Note

QC 20150522

Available from: 2015-05-22 Created: 2015-05-20 Last updated: 2016-02-02Bibliographically approved

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