Local Heat Generation in a Single Stack Lithium Ion Battery Cell

Heubner, Christian; Schneider, Michael; Lämmel, C.; Michaelis, Alexander

doi:10.1016/j.electacta.2015.10.182

Cited by 55 publications

(34 citation statements)

References 43 publications

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“…[9][10][11] In this sense, different methods to measure the intercalation entropy have been developed. [12][13][14][15][16][17] In the case of Li-ion insertion into graphite, the experimental curve for entropy as a function of composition, Reference 12, shows a step in the transition of stage II to stage I that could not be explained in the terms presented there.…”

mentioning

confidence: 99%

Shedding Light on the Entropy Change Found for the Transition Stage II→Stage I of Li-Ion Storage in Graphite

Leiva

Perassi

Barraco

2016

J. Electrochem. Soc.

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In order to examine the controversial hypothesis put forward to explain the entropy step experimentally observed for the stage II to stage I transition for lithium intercalation in graphite, a transparent statistical mechanical model is developed. The results obtained show that the entropy increase can be explained by the change of configurational entropy occurring at occupation of half of the lattice. Comparison with experimental data shows that attractive interactions between intercalated particles in the same layer must be assumed, in agreement with the ansatz made in the original experimental work. 5,6 and graphite, 7,8 are commonly found in electrodes of commercially lithium-ion cells. In addition to the mentioned intercalation materials, there are many others that are currently being studied or used as electrodes in lithium-ion cells. In particular, graphite is the most common material found in anodes of commercial lithium-ion cells.One of the most important features of the intercalation materials is that they can have ions stored in them with little changes in their crystalline structures. This feature allows a fast ion insertion and extraction and therefore high power density cells can be obtained when used as electrodes. However, a fast ion insertion and extraction generates heat in the cell, which can produce high temperature excursions of the cell and a premature aging.It has been demonstrated that a great portion of the heat that is generated in the intercalation materials comes from the intercalation entropy during a discharge. [9][10][11] In this sense, different methods to measure the intercalation entropy have been developed. [12][13][14][15][16][17] In the case of Li-ion insertion into graphite, the experimental curve for entropy as a function of composition, Reference 12, shows a step in the transition of stage II to stage I that could not be explained in the terms presented there. In a subsequent work, 18 two of the previous authors, state that a possible mechanism of the stage I phase formation may involve a 'dilute lithium layer' (noted dil-Li) that would have an alternating 'normal' Li layer (Li) with a hexagonal structure and a dilute lithium layer following the sequence (Li)-G-(dil-Li)-G. However, in a more recent review, Fultz 19 stated that the vibrational entropy resulting from the insertion dominates the entropy, and also he added that there should be a small change in the configurational entropy when compounds are formed in stage I or II, as they are ordered.In a previous work 20 we have proposed a theoretical approach to determine the intercalation entropy, and we applied this approach to the graphite/lithium compound. In order to clarify the origin of this entropy, in the present work we have used a simplified two-level lattice gas model to analyze the configurational contribution to the intercalation entropy of the graphite/lithium compound. The main features of the intercalation entropy are elucidated. z E-mail: eze_leiva@yahoo.com.ar Model and Statistical Mechanical Backgroun...

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confidence: 99%

Shedding Light on the Entropy Change Found for the Transition Stage II→Stage I of Li-Ion Storage in Graphite

Leiva

Perassi

Barraco

2016

J. Electrochem. Soc.

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“…55 The reversible heat dominates for a low current rate and the irreversible heat for a high current rate. 57 The irreversible heat increases both the charged and discharged process and also increases with increase in the current rate or the nominal battery capacity. 58 The reversible heat can be either positive or negative, which depends on the entropic coefficient sign.…”

Section: Resultsmentioning

confidence: 99%

“…The changing sign of this term depends on the charged and discharged processes, and it equal to zero as there is no current in the system 55 . The reversible heat dominates for a low current rate and the irreversible heat for a high current rate 57 . The irreversible heat increases both the charged and discharged process and also increases with increase in the current rate or the nominal battery capacity 58 .…”

Section: Resultsmentioning

confidence: 99%

Thermal cooling characteristics of Li‐ion battery pack with thermoelectric ferrofluid cooling module

et al. 2021

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The batteries have been continuously for obtaining the high voltage platform and high density of energy with long lifecycle. The operating temperature of the battery cell has a significant effect on the thermal performance. This paper aims to consider the 18 650-type lithium-ion battery pack's thermal characteristics with the thermoelectric module using ferrofluid as a coolant. The experiment apparatus is test to determine the lithium-ion battery pack's temperature distributions. Effects of the relevant parameters; hot and cold side flow rates (0.03-0.05 m 3 /hr), supplied voltage through thermoelectric (8-12 V), coolant types (De-ionized water and ferrofluid), and ferrofluid concentrations (0.005%-0.015% by volume) on the battery pack's cooling performance are considered. It is found that the thermoelectric cooling system significantly affects the battery pack cooling and gives the temperature of battery below 30 C.

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“…The total overpotential is induced by various processes occurring in a battery, such as the charge-transfer reactions at the electrode/electrolyte interfaces ( ) [64], the diffusion and migration of Li-ions across the electrolyte ( ) [65], diffusion and migration of Li-ions in the electrodes ( ) [66] and Ohmic losses ( ) [67]. Therefore, the total battery overpotential can also be expressed as…”

Section: Heat Generationmentioning

confidence: 99%

A review on various temperature-indication methods for Li-ion batteries

et al. 2019

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Temperature measurements of Li-ion batteries are important for assisting Battery Management Systems in controlling highly relevant states, such as State-of-Charge and State-of-Health. In addition, temperature measurements are essential to prevent dangerous situations and to maximize the performance and cycle life of batteries. However, due to thermal gradients, which might quickly develop during operation, fast and accurate temperature measurements can be rather challenging. For a proper selection of the temperature measurement method, aspects such as measurement range, accuracy, resolution, and costs of the method are important. After providing a brief overview of the working principle of Li-ion batteries, including the heat generation principles and possible consequences, this review gives a comprehensive overview of various temperature measurement methods that can be used for temperature indication of Li-ion batteries. At present, traditional temperature measurement methods, such as thermistors and thermocouples, are extensively used. Several recently introduced methods, such as impedance-based temperature indication and fiber Bragg-grating techniques, are under investigation in order to determine if those are suitable for largescale introduction in sophisticated battery-powered applications.

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Local Heat Generation in a Single Stack Lithium Ion Battery Cell

Cited by 55 publications

References 43 publications

Shedding Light on the Entropy Change Found for the Transition Stage II→Stage I of Li-Ion Storage in Graphite

Shedding Light on the Entropy Change Found for the Transition Stage II→Stage I of Li-Ion Storage in Graphite

Thermal cooling characteristics of Li‐ion battery pack with thermoelectric ferrofluid cooling module

A review on various temperature-indication methods for Li-ion batteries

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