DocumentCode :
3480828
Title :
Research on simplification of simulating the heat conduction in the lithium-ion battery core
Author :
Xuning Feng ; Xiangming He ; Languang Lu ; Minggao Ouyang
Author_Institution :
State Key Lab. of Automotive Safety & Energy, Tsinghua Univ., Beijing, China
fYear :
2013
fDate :
17-20 Nov. 2013
Firstpage :
1
Lastpage :
12
Abstract :
This paper discusses the model simplifing issue in battery thermal simulation. The paper verifies that for the large power battery simplifying the multilayer battery core as a lumped cuboid is reasonable. So when doing simulation, building a multilayer core is unnecessary. And the calculation cost can be reduced by the lumped model. Specific power battetry of 70Ah is dissembled to be modeld. Thermal models of are established, including models with a lumped core and with multilayer cores. For the lumped core, the anisotropic thermal conductivities are got by equations calculating series and parallel equivalent thermal conductivity. While for the multilayer core models, the core contains numbers of unit cells and the volume of which is equal to that of the lumped. In addition, under the boundary conditions of inner heat source and surface heating, steady state simulations are performed. Simulation results indicate that the temperature distributions of the lumped model and the multilayer model are almost the same. For one thing, large number of multilayers and low shell thermal conductivity contribute to a uniform temperature distribution within the core, so it is reasonable to simplify the multilayer core as a lumped cuboid. For another, due to the size of the battery and the shell property, it is difficult to find a simple curve to fit the simulation temperature on the battery surface. Although minor differences still exist, the lumped core can well subsitute the multilayer core in battery thermal simulation.
Keywords :
cores; heat conduction; secondary cells; temperature distribution; thermal conductivity; Li; anisotropic thermal conductivity; battery thermal simulation; heat conduction; heat source; lithium-ion battery core; lumped core; lumped cuboid; lumped model; multilayer battery core; multilayer cores; parallel equivalent thermal conductivity; power battery; steady state simulations; surface heating; uniform temperature distribution; Batteries; Boundary conditions; Conductivity; Heating; Mathematical model; Nonhomogeneous media; Thermal conductivity; Lithium ion battery; anisotropic conductivity; core simplification; multilayer; thermal modeling;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electric Vehicle Symposium and Exhibition (EVS27), 2013 World
Conference_Location :
Barcelona
Type :
conf
DOI :
10.1109/EVS.2013.6914984
Filename :
6914984
Link To Document :
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