Structural dynamics of lithium-ion cells – Part I: Method, test bench validation and investigation of lithium-ion pouch cells

Berg, Philipp; Soellner, Jonas; Jossen, Andreas

doi:10.1016/j.est.2019.100916

Cited by 15 publications

(8 citation statements)

References 68 publications

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“…The frequency response curve of the same point changed with the size of the knocking force. The experimental results are shown in Figure 6, which were consistent with the conclusion of Berg [27]. Therefore, the equivalent physical parameters of the prismatic cell could not be obtained through the impulse excitation test [39].…”

Section: The Finite Element Model Of Cellsupporting

confidence: 73%

“…Contrary to Hooper's conclusion, Popp et al established frequency response tests on pouch cells with different values of SOC at different temperatures, and concluded that the SOC value could be obtained by measuring the frequency response curve of the cell if the temperature is known [25]. Based on the research of Hooper and Popp, Berg et al [26,27] did a series of research on the structural dynamics of lithium-ion pouch cells and prismatic cells. They established a test bench for the experimental modal analysis (EMA) and found the sensitivity of structural response at the excitation level due to the non-linearity of the cell.…”

Section: Related Researchmentioning

confidence: 99%

“…In general, the equivalent physical parameters of the linear materials could be obtained through an impulse excitation test [39]. However, due to the gaps between the aluminum shell and the jellyroll, the microscopic gaps between the layers of jellyroll and porosity of jellyroll, the prismatic cell has a strong non-linearity [26,27]. The frequency response curve of the same point changed with the size of the knocking force.…”

Section: The Finite Element Model Of Cellmentioning

confidence: 99%

“…At present, regarding the crashworthiness analyses [14], relevant scholars have done a lot of tests at the cell [15][16][17][18] and the module [19][20][21] level, and these test results can validate finite element models [22][23][24]. However, for vibration analysis, there are only a few studies at the cell level [7,16,[25][26][27] but no research on battery modules. The structural dynamics of a battery module needs urgent elaboration.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Simulation Modal Analysis of a Prismatic Battery Module

Xia

Liu

et al. 2020

Energies

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The battery pack is the core component of a new energy vehicle (NEV), and reducing the impact of vibration induced resonance from the ground is a prerequisite for the safety of an NEV. For a high-performance battery pack design, a clear understanding of the structural dynamics of the key part of battery pack, such as the battery module, is of great significance. Additionally, a proper computational model for simulations of battery module also plays a key role in correctly predicting the dynamic response of battery packs. In this paper, an experimental modal analysis (EMA) was performed on a typical commercial battery module, composed of twelve 37Ah lithium nickel manganese cobalt oxide (NMC) prismatic cells, to obtain modal parameters such as mode shapes and natural frequencies. Additionally, three modeling methods for a prismatic battery module were established for the simulation modal analysis. The method of simplifying the prismatic cell to homogenous isotropic material had a better performance than the detailed modeling method, in predicting the modal parameters. Simultaneously, a novel method that can quickly obtain the equivalent parameters of the cell was proposed. The experimental results indicated that the fundamental frequency of battery module was higher than the excitation frequency range (0–150 Hz) from the ground. The mode shapes of the simulation results were in good agreement with the experimental results, and the average error of the natural frequency was below 10%, which verified the validity of the numerical model.

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Section: The Finite Element Model Of Cellsupporting

confidence: 73%

Section: Related Researchmentioning

confidence: 99%

Section: The Finite Element Model Of Cellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Simulation Modal Analysis of a Prismatic Battery Module

Xia

Liu

et al. 2020

Energies

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“…Experiments showed expansion only of the electrode perpendicular to the electrode thickness, hence dilation of the material is simulated orthotropic [36]. The binder material (usually polyvinylidene fluoride PVdF) of the electrodes and the separator materials (usually polyethylene PE or polypropylene PP) show visco-elastic behavior when stressed [37,38]. Owing to the only few available datasets and for the sake of simplicity of the model, material strain is simulated linear elastic in this work.…”

Section: Materials Modelsmentioning

confidence: 99%

Simulation of Spatial Strain Inhomogeneities in Lithium-Ion-Cells Due to Electrode Dilation Dependent on Internal and External Cell Structures

Ebert¹,

Spielbauer²,

Bruckmoser³

et al. 2021

Preprint

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Electrochemical-mechanical interactions, in particular pressure-induced ones, have been identified to be a cause for lithium-plating in lithium-ion cells. Mechanically-induced porosity inhomogeneities in the separator layers due to electrode expansion during charging especially lead to cell internal balancing currents and can cause localized plating. To identify cell-format and cell-material dependent mechanical weak spots, a layer-resolved mechanical simulation of different cell types and cell-material combinations is presented in this work. The simulation results show distinctive layer strain patterns for different cell-types that coincide with localized lithium-plating found in post-mortem cells. Additionally, the effects of cell bracing in battery modules is investigated and a method to mitigate the increased layer strain due to bracing counterforces is proposed that also increases cell energy density for hardcase-type automotive cells.

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