The effect of external compressive loads on the cycle lifetime of lithium-ion pouch cells

Barai, Anup; Tangirala, Ravichandra; Uddin, Kotub; Chevalier, J.; Guo, Yue; McGordon, Andrew; Jennings, Paul

doi:10.1016/j.est.2017.07.021

Cited by 92 publications

(35 citation statements)

References 32 publications

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“…Cells with initial external pressures have longer life than those without initial external pressures. Barai et al 24 of Warwick University compared the cycle life and power performance of 15 Ah NCM lithium‐ion pouch cells under three different confinement pressures. After 1200 cycles, the capacity fading of cells at 0, 5 and 15 psi pressure is 11.0%, 8.8% and 8.4% respectively, and the corresponding power fading is 7.5%, 39%, and 18% respectively.…”

Section: Introductionmentioning

confidence: 99%

A study of external surface pressure effects on the properties for lithium‐ion pouch cells

et al. 2020

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Summary Lithium‐ion pouch cells are widely used in electric vehicles because of their high energy density than other structures. There is an unavoidable external surface pressure between the cells in the process of packing and driving of electric vehicles. The influence of external surface pressure on the main properties of the lithium‐ion pouch cell has been studied, which is of great significance to packing batteries and reusing retired cells. In this study, a testing device applied for the measurement of constant external surface pressures of lithium‐ion pouch cells was first proposed and the different pressure stress‐strain distribution on the external surface of cells under semirigid material pads were analyzed by simulation. The effects of pressure on the capacity, internal resistance, and open circuit voltage of fresh and aged LiNixCoyMnzO2 (NCM) lithium‐ion pouch cells are analyzed through experiments under 1 Mpa external surface pressure. The results show that the internal resistance of fresh cells tends to decrease. The average percentage of the maximum reduction of internal resistance is 13.28%. The experiments also demonstrate that the capacity of aging cells increased by 2.3%. Irreversibility of capacity improvement indicates applying appropriate external surface pressure can improve the secondary utilization efficiency of aging cells.

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Section: Introductionmentioning

confidence: 99%

A study of external surface pressure effects on the properties for lithium‐ion pouch cells

et al. 2020

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“…Different pretension forces were applied to the electrode stack during each ageing procedure. The value during LP cycling was chosen to represent a typical compression that acts upon pouch cells when assembled in a module/pack configuration [25,26]. Even though the applied pretension during the HP-ageing program is too high to be realised in a practical battery pack for automotive applications [26], it can provide a better understanding on how battery properties are affected by an increased external load.…”

Section: Ageing Procedures and Used Equipmentmentioning

confidence: 99%

Thermal Conductivity in Aged Li-Ion Cells under Various Compression Conditions and State-of-Charge

et al. 2021

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Thermal conductivity (TC) is a parameter, which significantly influences the spatial temperature gradients of lithium ion batteries in operative or abuse conditions. It affects the dissipation of the generated heat by the cell during normal operation or during thermal runaway propagation from one cell to the next after an external short circuit. Hence, the thermal conductivity is a parameter of great importance, which concurs to assess the safety of a Li-ion battery. In this work, an already validated, non-destructive measurement procedure was adopted for the determination of the evolution of the through-plane thermal conductivity of 41 Ah commercially available Li-ion pouch cells (LiNiMnCoO2-LiMn2O4/Graphite) as function of battery lifetime and state of charge (SOC). Results show a negative parabolic behaviour of the thermal conductivity over the battery SOC-range. In addition, an average decrease of TC in thickness direction of around 4% and 23% was measured for cells cycled at 60 °C with and without compression, respectively. It was shown that pretension force during cycling reduces battery degradation and thus minimises the effect of ageing on the thermal parameter deterioration. Nevertheless, this study highlights the need of adjustment of the battery pack cooling system due to the deterioration of thermal conductivity after certain battery lifetime with the aim of reducing the risk of battery overheating after certain product life.

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“…The effect of compressive pressure on battery degradation was investigated. Battery cells were cycled 1200 times under 0.5 psi and 15 psi compressive pressure loads [11]. It was seen that capacity fade for 0.5 and 15 psi pressure loads were 11.0%, 8.8%, and 8.4%.…”

Section: Effect On Capacitymentioning

confidence: 99%

“…This contradictory behavior was found to be pertaining to the separator creep and wettability rise in the cell after pressure load was applied. The investigation determined the progress of compressive loads over numerous cycles, and it was concluded that pressure raises with cycling [11].…”

Section: Effect On Capacitymentioning

confidence: 99%

Characterization of the Compressive Load on a Lithium-Ion Battery for Electric Vehicle Application

2021

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Lithium-ion batteries are being implemented in different large-scale applications, including aerospace and electric vehicles. For these utilizations, it is essential to improve battery cells with a great life cycle because a battery substitute is costly. For their implementation in real applications, lithium-ion battery cells undergo extension during the course of discharging and charging. To avoid disconnection among battery pack ingredients and deformity during cycling, compacting force is exerted to battery packs in electric vehicles. This research used a mechanical design feature that can address these issues. This investigation exhibits a comprehensive description of the experimental setup that can be used for battery testing under pressure to consider lithium-ion batteries’ safety, which could be employed in electrified transportation. Besides, this investigation strives to demonstrate how exterior force affects a lithium-ion battery cell’s performance and behavior corresponding to static exterior force by monitoring the applied pressure at the dissimilar state of charge. Electrochemical impedance spectroscopy was used as the primary technique for this research. It was concluded that the profiles of the achieved spectrums from the experiments seem entirely dissimilar in comparison with the cases without external pressure. By employing electrochemical impedance spectroscopy, it was noticed that the pure ohmic resistance, which is related to ion transport resistance of the separator, could substantially result in the corresponding resistance increase.

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The effect of external compressive loads on the cycle lifetime of lithium-ion pouch cells

Cited by 92 publications

References 32 publications

A study of external surface pressure effects on the properties for lithium‐ion pouch cells

A study of external surface pressure effects on the properties for lithium‐ion pouch cells

Thermal Conductivity in Aged Li-Ion Cells under Various Compression Conditions and State-of-Charge

Characterization of the Compressive Load on a Lithium-Ion Battery for Electric Vehicle Application

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