Structural dynamics of lithium-ion cells—part II: Investigation of large-format prismatic cells and method evaluation

Berg, Philipp; Soellner, Jonas; Herrmann, Matthias; Jossen, Andreas

doi:10.1016/j.est.2020.101246

Cited by 11 publications

(9 citation statements)

References 65 publications

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“…Although there was no significant electrical performance degradation, they discovered that the negative current collector tabs of certain cell designs were mechanically damaged, underscoring the significance of inner cell design for vibration durability. Berg et al 42 also conducted an experimental investigation on the structural dynamics of individual Li-ion prismatic cells. Their results show that the cell structural dynamics, including natural frequencies, damping ratios, and mode shapes, is highly sensitive to the cell state of charge and temperature.…”

Section: Effect Of Vibrations On Battery Cellsmentioning

confidence: 99%

Effect of dynamic loads and vibrations on lithium-ion batteries

Xia

Thomas

2021

Journal of Low Frequency Noise, Vibration and Active Control

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Lithium-ion batteries are being increasingly used as the main energy storage devices in modern mobile applications, including modern spacecrafts, satellites, and electric vehicles, in which consistent and severe vibrations exist. As the lithium-ion battery market share grows, so must our understanding of the effect of mechanical vibrations and shocks on the electrical performance and mechanical properties of such batteries. Only a few recent studies investigated the effect of vibrations on the degradation and fatigue of battery cell materials as well as the effect of vibrations on the battery pack structure. This review focused on the recent progress in determining the effect of dynamic loads and vibrations on lithium-ion batteries to advance the understanding of lithium-ion battery systems. Theoretical, computational, and experimental studies conducted in both academia and industry in the past few years are reviewed herein. Although the effect of dynamic loads and random vibrations on the mechanical behavior of battery pack structures has been investigated and the correlation between vibration and the battery cell electrical performance has been determined to support the development of more robust electrical systems, it is still necessary to clarify the mechanical degradation mechanisms that affect the electrical performance and safety of battery cells.

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Section: Effect Of Vibrations On Battery Cellsmentioning

confidence: 99%

Effect of dynamic loads and vibrations on lithium-ion batteries

Xia

Thomas

2021

Journal of Low Frequency Noise, Vibration and Active Control

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“…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%

“…The different SOC of the cell could cause different measured modal parameters [26]. However, the influence of the SOC of the battery module was not considered in this study.…”

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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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Impact of Bracing on Large Format Prismatic Lithium‐Ion Battery Cells during Aging

Daubinger

Schelter²,

Petersohn³

et al. 2021

Advanced Energy Materials

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To reduce the ecological footprint and to increase the lifetime of lithium‐ion batteries (LIBs), it is necessary to understand aging phenomena inside the cells during cycling. In this study, the positive effect of external pressure through bracing the cells on aging is investigated for automotive battery cells with more than 7000 cycles. After cycling, the aged cells are studied by using post‐mortem analysis. It is shown that bracing does not affect the anode and cathode in the same manner. A lack of external pressure results in lithium plating due to contact losses on the anode. Such a loss of lithium inventory plays only a small role in the braced cells. However, the structural and morphological degradation, such as particle cracking at the cathode, is significant. Half‐cell tests of aged and unaged anode samples extracted from the automotive cells confirm the post‐mortem findings, where only minimal differences can be seen for the braced cell. In contrast, the aged cathodes from braced cells demonstrate substantial capacity fade in half‐cell measurements as compared to the cathodes extracted from the unbraced cell. Finally, a new concept of the mechanical state of health (mechanical SOH) is introduced to correlate mechanical effects with electrode degradation.

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Structural dynamics of lithium-ion cells—part II: Investigation of large-format prismatic cells and method evaluation

Cited by 11 publications

References 65 publications

Effect of dynamic loads and vibrations on lithium-ion batteries

Effect of dynamic loads and vibrations on lithium-ion batteries

Experimental and Simulation Modal Analysis of a Prismatic Battery Module

Impact of Bracing on Large Format Prismatic Lithium‐Ion Battery Cells during Aging

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