HANNOVER MESSE 2020, 20 - 24 April
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Zigzagging to the cell stack

A novel, automated procedure for stacking.

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Karlsruher Institut für Technologie

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Exhibitor details
Logo Zigzagging to the cell stack

Product description

Proponents of electromobility pin their hopes on efficient energy storage devices. However, a breakthrough would above all require reduced manufacturing costs. They are a major cost-pusher since automation of producing cells has not yet reached maturity. The central processing step in cell manufacturing is stacking: putting together electrodes and separators to form a stack of cells. Frequently, sheet stacking, i.e. the discontinuous stacking of individual layers, is applied. The form-cut materials are laid sheet by sheet one over the other, which creates a high energy density (energy storage capacity per unit weight). At the same time, however, this entails a high manufacturing effort. Form-cutting the material bears the danger of burr formation along the edges of the electrode and particulate contamination, which raises the risk of short-circuiting. Scientists at KIT have developed a new stacking approach in which four material webs are folded one on top of the other in zigzag fashion. Using electrode webs coated intermittently and incorporating coating gaps prevents active material from bursting off the folded edges. In addition, these areas are later on used as cell arrestors. The anode is coated on both sides and is enclosed by two separator webs. The cathode, coated on one side only, is positioned at a ninety-degree angle to the anode. For the stacking process, the three-layer material web is laid first, and the cathode web is then coated and directly folded back, so that it forms a double layer with the coating on the outside. The three layers are then folded onto this. The process is continuously repeated until the desired stack height is reached, with the number of layers depending on the desired electrical characteristic values of the finished cell.

You can get an overview of this technology at KIT stand. Detailed information can be exchanged individually in contact with the responsible scientific employees of KIT after the industry fair.

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