Case Studies in Thermal Engineering,
Journal Year:
2024,
Volume and Issue:
61, P. 104898 - 104898
Published: Aug. 8, 2024
To
safely
utilize
retired
power
lithium-ion
batteries
(PLIBs)
for
secondary,
LiFePO₄/graphite
were
taken
as
research
object.
The
electrochemical-thermal
behaviors
investigated
under
different
operating
conditions.
experimental
results
show
that
heat
generated
will
greatly
increase,
and
the
uneven
distribution
of
temperature
within
battery
become
more
severe
during
high-temperature
cycles.
Compared
with
room
cycling,
decay
rate
SOH
increased
by
419.88
%
after
400
cycles
at
environment.
After
25
°C
55
°C,
maximum
difference
3C
from
2.05
to
2.91
2.14
°C–3.03
respectively,
corresponding
increases
41.95
41.59
%.
800
overcharging,
state
health
(SOH)
was
only
67.52
%;
compared
normal
cycles,
156.25
Finally,
a
method
assessing
battery's
status
based
on
frequency
peak
area
in
probability
density
function
(PDF)
proposed.
These
proved
effectiveness
proposed
evaluating
PLIBs.
IEEE Transactions on Power Electronics,
Journal Year:
2024,
Volume and Issue:
39(12), P. 16609 - 16621
Published: Aug. 12, 2024
Lithium-ion
battery
failure
is
the
main
cause
of
electric
vehicle
fire
accidents.
In
this
article,
we
propose
a
fault
analysis
framework
for
Big
Data-driven
trace
extraction
based
on
whole-life-cycle
charging
data
onboard
lithium-ion
batteries.
First,
voltage
features
strongly
correlated
with
faults
are
mined
and
automatically
selected
by
random
forest
algorithm
from
last-one-cycle
operation
before
sample
Second,
usage
vector
points
composed
features,
density
clustering
applied
to
identify
faulty
cells,
their
traces
in
whole
life
cycle
tracked
through
utilizing
Gaussian
mixture
model.
This
work
uses
more
than
ten
real
verification.
The
results
show
that
proposed
method
can
detect
abnormality
one
cell
at
least
dozens
cycles
advance,
or
even
earliest
stage.
By
classifying
traces,
paper
also
preliminarily
proposes
distinguish
caused
intrinsic
operative
abnormalities,
conducive
discriminate
accident
liability.
