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Printed Thin Film Battery

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					                                     Printed Thin Film Battery


1.     General Description
Today electronic applications have become
ubiquitous and will be found in all areas of
our daily life. This requires matching energy
sources with high flexibility in regard to thick-
ness, geometrical shape, voltage, capacity and
weight. Applying the appropriate functional ma-      Fig. 1: Design scheme of printed battery
terials to flexible substrates using mass print-
ing technologies will open new opportunities to
integrate e.g. batteries into ductile products.
The printed battery is a joint innovative de-
velopment of the department Printed Func-
tionalities of Fraunhofer ENAS and the Digital
Printing Group of the Chemnitz University of
Technology (TUC). Serial connections of bat-
teries can be printed in one step, thus integer
multiples of the nominal voltage of 1.5 V are
demonstrated (3 V, 4.5 V, 6 V). The battery is
based on a zinc manganese system which is            Fig. 2: Printed thin film battery with 3.0 V nominal voltage
free of mercury, widely used and might be re-
garded as environmentally friendly. Parts of the
battery components may even be composted.
By using high efficient printing technologies
and well adapted materials / inks, the produc-
tion yield is expected to be > 90 %.
The printed batteries are especially suited for
thin and flexible products in which they can be
easily integrated. Appropriate products might
be intelligent chip and sensor cards, medical
patches and plasters for transdermal medica-
tion and vital signs monitoring or lab-on-chip       Fig. 3: Discharge curve of a printed battery
analysis systems. Furthermore the combination
with other flexible electronic modules, e.g. flex-
ible low-end displays will open further and new
fields of application. Currently first demonstra-    4.     Characteristics
tors for different applications are on the way.
The lab-scale battery developed by ENAS /            Primary Zn-MnO2 battery
TUC has reached a promising level for first
demonstrators and first integration approaches        Parameter               Value                  Unit
with industrial partners.                             Nominal voltage         1.5, 3.0, 4.5, 6.0     V

2.       Features                                     Nominal capacity        2                      mAh/cm²
     •   Low thickness, high flexibility              Thickness               approx. 0.6            mm
     •   Low price
                                                      Weight                  approx. 0.75           g
     •   High layout variability
     •   Environmentally friendly
                                                     5.     Contact
3.       Suggested Applications
     •   Smart Systems                               Prof. Dr. Reinhard R. Baumann
     •   Smart Cards                                 Phone: +49 371 45001-234
     •   Semi-active RFID-Label                      Fax:     +49 371 45001-334
     •   Medicine (“smart patches”)                  Email: reinhard.baumann@enas.fraunhofer.de

				
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posted:11/13/2011
language:English
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