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Contacting of metal-polymer current collectors for use in cylindrical cells: Concept development and validation
  • Bachelor and Master Thesis
    • Battery research: Selective laser sintering for use in future batteries
    • Evaluation of the influence of particle contamination depending on the separator and compression using the Hi-Pot Test
    • Contacting of metal-polymer current collectors for use in cylindrical cells: Concept development and validation
    • Optimization of a bending test for the mechanical characterization of battery electrodes
    • Influence of cutting process and free cut edge geometry on the Al-5083 fatigue strength
    • Design and testing of a device and method for the in-situ calibration of force sensors in the die casting process
    • Laser beam assembly of lithium metal anodes
    • Laser pretreatment of die-cast aluminium for in-mold assembly with plastic
    • Prediction of component properties in high-pressure die casting using machine learning
    • Remelting effect on temperature field, residual stress, and distortion in WAAM components
    • Residual stress variations during fabrication
    • Conversion and test of a heating system
    • Investigation of the local suitability for adhesive bonding of aluminium die-cast components
    • Investigation of the local suitability for welding of aluminium die-cast components
    • Influence of thermal cutting processes on the quality of the cut edges
    • Toughness of high strength welded steels

Contacting of metal-polymer current collectors for use in cylindrical cells: Concept development and validation

Background

In conventional Li-ion batteries, aluminum or copper foils are used as current collectors. The foil serves both as a carrier foil for the coating with the active material suspension and to conduct the electrons generated in the cell. For this purpose, the current collectors are contacted with a tab, which then conducts the electrons out of the cell.

Recently, intensive research efforts have been made to use metallized polymer foils instead of metal foils. These increase the intrinsic safety of the cell and reduce the mass. At the same time, the contacting process has to be redeveloped, as the polymer is electrically insulating and also has fundamentally different material properties. This primarily affects contacting in or for cylindrical cells. Up to now, laser beam, ultrasonic and resistance spot welding processes have been used here. None of these are applicable to the new composite current collector. The aim of the study is therefore to develop and test new concepts for contacting the composite current collectors in round cells. This means that the joining areas and accessibility are limited, while at the same time low electrical resistances must be achieved. This poses a particular challenge.

Task

  • Literature research on the current status of contacting in battery cells and on metal-polymer current collectors
  • Concept development for the realization of sufficient contacting for cylindrical cells
  • Conducting experiments and comparing the results
  • Interpretation of the results

Scope of the work

The student work can be carried out as part of a student research project, Bachelor's or Master's thesis.

Ultrasonically welded joint with copper-coated PET foils

Requirements

  • Student at faculty 4 or 5
  • Good knowledge of German and English
  • High motivation, independent and structured way of working, as well as reliable documentation

Start

By arrangement, gladly immediately.

Hakon Gruhn
+ 49 531 391 95597
h.gruhn(at)tu-braunschweig.de
Hakon Gruhn
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