Two batteries with a nominal charge of 10 A.h starting with an initial SOC = 95 % are compared:
battery1 is a battery OCV linearly dependent on
SOC, without self-discharge and not comprising RC-elements.battery2 is a battery OCV dependency on SOC is
specified by a table, with self-discharge and including
RC-elements.Two
parameter records cellData1 and
cellData2 are used to parameterize the battery
models.
First the batteries are discharged with 7 current pulses of 50 A
for 1 minute, and breaks between the pulses of 1 minute, ending at
SOC = 5 %.
Subsequently, the batteries are charged again with 7 current pulses
of 50 A for 1 minute, and breaks between the pulses of 1 minute,
ending at SOC = 95 % again.
In the end, the batteries are in no-load condition to reveal
self-discharge effects. Note that self-discharge of
battery2 is set to an unrealistic high value, to show
self-discharge within a rather short time span.
The parameters of the RC-elements of battery2 are set
to estimated values, just to demonstrate the effects.
Simulate and plot terminal voltage battery1.v and
battery2.v as well as state of charge
battery1.SOC and battery2.SOC.
Plotting energy1.y and energy2.y, it
is remarkable that first energy is delivered by the battery, but
then due to the losses more energy is consumed to recharge the
battery.