Page 31 - European Energy Innovation - autumn 2017 publication
P. 31

Autumn 2017 European Energy Innovation  31


(without cells) costs should be about       Figure 2: Proposal 1
80:20 or even more for the cell.
In reality, we find 40:60 and even           Figure 3: Proposal 2
less than 40, which is consequently          Contact details:
one of the cost drivers of actual            Prof. Dr.-Ing. Kai Peter Birke and Christoph Bolsinger, Electrical Energy Storage
batteries. Again, the reason is not          Systems, University of Stuttgart, Pfaffenwaldring 47, D-70569 Stuttgart, Germany
the cell but the battery. If such issues     Email:
are consequently addressed, cost
friendly mass-production on battery
level and system costs of less than
100 €/kWh seem to be feasible. This
becomes competitive if efforts for
combustion engines to pass emission
rules increase continuously. Also
quite simple assembly concepts can
apply and the cell becomes a central
construction element – as presented
in the LIBELLE-project. This may help
to achieve the cost targets. Therefore,
the assembly concepts for the cell
are hugely important. In addition
a modular block building concept
to address many applications, from
light-mobility over HEV, PHEV and EV
to heavy duty applications (Figures 2
and 3), is equally essential. This is just
tuned by employing higher power or
high energy tuned cells (which have
the same size). The heat conduction is
carried over the common metal board
where the cell poles are mounted
(see Figure 1). These common boards
are then connected to a slim cooling
board (not depicted). Its dimension
and the cooling media throughput
finally determine the temperature of
the battery and can thus be adjusted
to the different above mentioned
applications. ●
   26   27   28   29   30   31   32   33   34   35   36