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Methodology to determine the heat capacity of lithium-ion cells

Methodology to determine the heat capacity of lithium-ion cells
Methodology to determine the heat capacity of lithium-ion cells
In this paper a novel method to determine the specific heat capacity of lithium-ion cells is proposed. The specific heat capacity is an important parameter for the thermal modelling of lithium-ion batteries and is not generally stated on cell datasheets or available from cell manufacturers. To determine the specific heat capacity can require the use of an expensive (>£100k) calorimeter or the deconstruction of the cell whereas the method proposed by the authors in this paper uses common equipment found in most battery laboratories. The method is shown to work for cylindrical, prismatic and pouch cells, with capacities between 2.5 Ah and 10 Ah. The results are validated by determining the specific heat capacity of the cells with use of a calorimeter and a maximum error of 3.9% found. Thermal modelling of batteries is important to ensure cell temperatures are kept within specified limits. This is especially true at rates over 1C, such as the fast charging of electric vehicles, where more heat is generated than lower rate applications. The paper ends by demonstrating how the thermal model that underpins the authors’ methodology can be used to model the surface temperature of the cells at C-rates greater than 1C.
0378-7753
369-378
Bryden, Thomas S.
451e1fd4-25ab-4771-9e69-0598acf6d626
Dimitrov, Borislav
7a128e82-8621-4ffb-8390-77f7153d5d3a
Hilton, George
fd332562-ee82-4b62-b99c-0d0ee2e06ca1
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Bugryniec, Peter
b57ec1d6-e3a0-413f-9a70-bce015907df5
Brown, Solomon
cb5315e2-ba9d-4e79-9dcf-846978e3114b
Cumming, Denis
d79271fa-333d-4ad0-8d44-9fa27d0d7841
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Bryden, Thomas S.
451e1fd4-25ab-4771-9e69-0598acf6d626
Dimitrov, Borislav
7a128e82-8621-4ffb-8390-77f7153d5d3a
Hilton, George
fd332562-ee82-4b62-b99c-0d0ee2e06ca1
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Bugryniec, Peter
b57ec1d6-e3a0-413f-9a70-bce015907df5
Brown, Solomon
cb5315e2-ba9d-4e79-9dcf-846978e3114b
Cumming, Denis
d79271fa-333d-4ad0-8d44-9fa27d0d7841
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab

Bryden, Thomas S., Dimitrov, Borislav, Hilton, George, Ponce De Leon Albarran, Carlos, Bugryniec, Peter, Brown, Solomon, Cumming, Denis and Cruden, Andrew (2018) Methodology to determine the heat capacity of lithium-ion cells. Journal of Power Sources, 395, 369-378. (doi:10.1016/j.jpowsour.2018.05.084).

Record type: Article

Abstract

In this paper a novel method to determine the specific heat capacity of lithium-ion cells is proposed. The specific heat capacity is an important parameter for the thermal modelling of lithium-ion batteries and is not generally stated on cell datasheets or available from cell manufacturers. To determine the specific heat capacity can require the use of an expensive (>£100k) calorimeter or the deconstruction of the cell whereas the method proposed by the authors in this paper uses common equipment found in most battery laboratories. The method is shown to work for cylindrical, prismatic and pouch cells, with capacities between 2.5 Ah and 10 Ah. The results are validated by determining the specific heat capacity of the cells with use of a calorimeter and a maximum error of 3.9% found. Thermal modelling of batteries is important to ensure cell temperatures are kept within specified limits. This is especially true at rates over 1C, such as the fast charging of electric vehicles, where more heat is generated than lower rate applications. The paper ends by demonstrating how the thermal model that underpins the authors’ methodology can be used to model the surface temperature of the cells at C-rates greater than 1C.

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Methodology to Determine the Heat Capacity of Lithium-ion Cells - Accepted Manuscript
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More information

Accepted/In Press date: 27 May 2018
e-pub ahead of print date: 15 June 2018
Published date: 15 August 2018

Identifiers

Local EPrints ID: 421575
URI: http://eprints.soton.ac.uk/id/eprint/421575
ISSN: 0378-7753
PURE UUID: 8bcdf9f9-5256-4ece-819e-fb8542d28744
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913
ORCID for Andrew Cruden: ORCID iD orcid.org/0000-0003-3236-2535

Catalogue record

Date deposited: 15 Jun 2018 16:30
Last modified: 17 Dec 2019 01:46

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