A Process Model for the Electrolyte Filling of Lithium-ion Batteries

Knoche, Thomas; Surek, Florian; Reinhart, G.

doi:10.1016/j.procir.2015.12.044

Cited by 49 publications

(39 citation statements)

References 8 publications

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“…To reduce the porosity from 50% to 30%, the electrode coils were calendered at 120 • C roller temperature. The resulting structure and the pores of anode and cathode, which influence the wettability of the components and thereby affect the filling process, 24 are shown in Figure 1. To achieve different wetting behavior of the cells, the electrodes for cell B were structured with a laser beam method, which led to different mass and surface of the active material.…”

Section: Methodsmentioning

confidence: 99%

Introduction to Electrochemical Impedance Spectroscopy as a Measurement Method for the Wetting Degree of Lithium-Ion Cells

Günter

Habedank

Schreiner

et al. 2018

J. Electrochem. Soc.

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In the production process chain of lithium-ion battery cells, the filling, consisting of dosing and wetting steps, of the cell and its components with electrolyte liquid is eminent for the final product quality and costs. To reduce the unnecessary wetting duration between filling and formation, and thereby the production costs, a measurement method for the wetting progress is necessary. In this paper, electrochemical impedance spectroscopy (EIS) as a well-established technique is used for the first time to quantify the wetting degree of batteries during cell production. The experimental data of the EIS acquired during the dosing and subsequent wetting process is correlated to images recorded by in situ neutron radiography. Results show that the impedance of the battery cells strongly depends on the wetting degree of the cell assembly and can thus be used to determine the fully wetted state enabling faster processing.

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Section: Methodsmentioning

confidence: 99%

Introduction to Electrochemical Impedance Spectroscopy as a Measurement Method for the Wetting Degree of Lithium-Ion Cells

Günter

Habedank

Schreiner

et al. 2018

J. Electrochem. Soc.

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“…As all openings of the cell must be closed in an additional production step immediately after formation, the common formats have only one filling port. The cell assembly in combination with the housing determines the empty volume . Furthermore, it sets the penetration direction(s) of the electrolyte during wetting, as discussed in Section .…”

Section: Analysis Of the Influence Of The Cell Format On The Filling mentioning

confidence: 99%

Influence of the Cell Format on the Electrolyte Filling Process of Lithium‐Ion Cells

et al. 2019

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During the production process of lithium‐ion battery cells, the filling, which consists of dosing and wetting steps, of the cell and its components with an electrolyte liquid is important for the quality and costs of the final product. The cell format as a combination of housing and cell arrangement not only determines the type of filling process but also influences the distribution of the electrolyte within the cell. The cell format also has an influence on the wetting state as a function of time. Herein, in situ neutron radiography is used to analyze the filling process of two different cell types – pouch cells with a z‐folded stack and hardcase cells with a flat wound roll. The results are then analyzed and transferred to other common cell formats to identify a fillable cell design and format‐dependent process improvement possibilities to enable faster processing.

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“…Therefore, for effective filling and wetting, different optimization possibilities of this process step have been proposed, including the application of rotational forces, increased temperatures, or pressure gradients . State‐of‐the‐art manufacturing processes typically apply filling procedures using reduced‐ and over‐pressure profiles . However, the influence of these profiles on the electrolyte composition has not been given much attention by academia, and the electrolyte composition was considered to be constant until the electrochemical activation of the cell.…”

Section: Amounts Of the Regained Electrolyte For The Different Cellsmentioning

confidence: 99%

Concept for the Analysis of the Electrolyte Composition within the Cell Manufacturing Process: From Sealing to Sample Preparation

et al. 2019

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An 18650 cell filled with electrolyte by applying cycles of over‐ and reduced‐pressure is demonstrated. The pristine and the extracted electrolyte do not differ with respect to their carbonate content, however, sodium is found to be introduced by the sodium‐carboxymethyl cellulose (Na‐CMC) binder. More details can be found in article number http://doi.wiley.com/10.1002/ente.201801081 by Sascha Nowak and co‐workers.

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A Process Model for the Electrolyte Filling of Lithium-ion Batteries

Cited by 49 publications

References 8 publications

Introduction to Electrochemical Impedance Spectroscopy as a Measurement Method for the Wetting Degree of Lithium-Ion Cells

Introduction to Electrochemical Impedance Spectroscopy as a Measurement Method for the Wetting Degree of Lithium-Ion Cells

Influence of the Cell Format on the Electrolyte Filling Process of Lithium‐Ion Cells

Concept for the Analysis of the Electrolyte Composition within the Cell Manufacturing Process: From Sealing to Sample Preparation

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