Thermal simulation of lithium secondary batteries

Kanari, Katsuhiko; Takano, Kiyonami; Terada, Nobuyuki; Saito, Yoshiyasu; Shiota, Hirotaka; Funahashi, Atsuhiro; Terasaki, Masanao

doi:10.1299/jsmepes.2000.7.178

Cited by 2 publications

(2 citation statements)

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“…Kanari et al report the effective conductivity to be 1.29 W/mK. 55 Since these samples are obtained from commercial electrodes, no information about the volume fraction of the constituents is known.…”

Section: Battery Electrode Microstructures-tablementioning

confidence: 99%

Bruggeman's Exponents for Effective Thermal Conductivity of Lithium-Ion Battery Electrodes

Vadakkepatt

Trembacki

Mathur

et al. 2015

J. Electrochem. Soc.

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Simulations of lithium-ion battery cells are usually performed with volume averaging methods that employ effective transport properties. Bruggeman's model, which is widely used to determine these effective properties, is primarily based on the volume fraction of porous electrodes. It does not consider actual particle shape, size or the topology of constituent phases; these play a crucial role in determining effective transport. In this paper, a general derivation of the effective thermal conductivity of multiphase materials, which can be correlated with these factors, is derived using the volume averaging technique. Three-dimensional finite volume meshes of fully-resolved lithium-ion battery cathode microstructures are reconstructed from scanned images. Effective volume averaged thermal conductivity is then determined from numerical analysis of thermal transport on these meshes. It is shown that the Bruggeman model for effective thermal conductivity must be recalibrated to fit the effective thermal conductivity computed from these detailed simulations. The relevance of these results to effective transport properties typically employed in electrochemical simulations is presented. Commonly used theories for effective thermal transport in composites are evaluated for comparison. Furthermore, it is shown that Bruggeman's exponents yield an important quantitative measure, the connectivity, to characterize the physical path for transport through the underlying phases. The importance of lithium-ion batteries is now well recognized in light of the global energy crisis, global warming and the need for efficient and inexpensive energy storage options.1,2 Battery physics encompass thermodynamics, electrochemistry, material science, transport phenomena and solid mechanics, and span multiple length and time scales.3 Realistic modeling of batteries across these disparate physics and scales is critical for their effective and safe commercialization. 4 Research in lithium-ion batteries has been primarily driven by the need to develop cathode, anode and electrolyte materials that deliver high potential and capacity. 5,6 On the cell level, the battery consists of a porous composite anode and cathode filled with an electrolyte and separated by a separator. Typically, the thickness of such a sandwich is hundreds of microns, while lateral dimensions are of the order of centimeters. Lithium ions shuttle between cathode and anode during charge and discharge. Active cathode particles (for e.g. LiCoO 2 , LiMn 2 O 4 , LiFePO 4 ), which form the key constituent of batteries, are lithium insertion compounds and have high lithium ion conductivity. These active particles are spatially dispersed and held together by binder (such as polyvinylidene fluoride [PVDF]), while the electrolyte resides in the pores, wetting the active particles, and facilitating transport of lithium ions. The electronic conductivity of these active materials is generally low compared to lithium ion conductivity. Therefore additives like carbon particles are dispersed ...

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Section: Battery Electrode Microstructures-tablementioning

confidence: 99%

Bruggeman's Exponents for Effective Thermal Conductivity of Lithium-Ion Battery Electrodes

Vadakkepatt

Trembacki

Mathur

et al. 2015

J. Electrochem. Soc.

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“…Kanari et al 12,13 presented a two-dimensional model to simulate the temperature profile of cylindrical Sony-type US18650 cell. The model was used to simulate the cell temperature profile during charge and discharge at 0.2C to 2C rates and compared with measured values of the center, top, and bottom sides of the cell.…”

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confidence: 99%

A Novel Thermal Management System for Electric Vehicle Batteries Using Phase-Change Material

Hallaj

Selman

2000

J. Electrochem. Soc.

505

133

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A novel thermal-management system that incorporates phase-change material (PCM) is proposed and investigated for electric vehicle (EV) applications. A commercial finite-element (FE) software, PDEase2D™, was used to simulate the thermal behavior of EV battery modules with a PCM thermal management system. Simulation results show that the temperature profile of the cells integrated in the module design was substantially more uniform during discharge at different rates than without PCM. The PCM system is effective in thermally sensitive batteries such as Li-ion and most Li-polymer batteries with a significant reversible heat effect. The heat generated during discharge and stored as latent heat is then largely utilized during charge, and a smaller part of it is transferred to the surroundings. The stored heat will be rejected to the module when the battery is left to relax or when its temperature drops below the melting point of the PCM. This is an important advantage for EV operation under cold conditions or in space applications where the battery temperature drops significantly when an orbiting satellite moves from the light to the dark side of the earth.

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Thermal simulation of lithium secondary batteries

Cited by 2 publications

References 0 publications

Bruggeman's Exponents for Effective Thermal Conductivity of Lithium-Ion Battery Electrodes

Bruggeman's Exponents for Effective Thermal Conductivity of Lithium-Ion Battery Electrodes

A Novel Thermal Management System for Electric Vehicle Batteries Using Phase-Change Material

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