Company Profiles
Safety Should Never Be
An Afterthought
Coulombic Efficiency
Testing
All Maccor channels are designed with safety hardware
to disconnect the device under test (DUT) in the event
of a battery failure. With Maccor there is no need for a
redundant safety monitoring system which adds cost to
the system and takes up additional lab space. You simply
program the safety limits in the test procedure and then
if any of these limits or the separate channel safeties
are exceeded there is an isolation relay integrated into
each channel that opens to place the DUT into a safe
open circuit voltage condition. The programmable
Maccor safeties are not just limited to current, voltage,
power, and temperature but also include user defined
mathematical functions. In addition there are watchdog
timers integrated into the Maccor systems to place the
DUT in a safe open circuit condition in the event of a
communication failure (i.e. the control PC locking up).
With MacNotify you can configure the system to send an
email if a channel is suspended for any reason. You can
also program an email to be sent at a specific point in the
test procedure.
Coulombic efficiency measurements are increasingly being
used to measure the effects of material changes on battery
performance. It is believed that these measurements can
indicate changes in performance more quickly as opposed
to a complete cycle life test which in many cases is not
feasible due to time constraints.
Coulombic Efficiency is defined as ,
where
Q is Capacity. The only variables needed to calculate
capacity are current and time. The more accurate these
measurements are, the more accurate capacity will be and
thus the more accurate coulombic efficiency values will be.
This also requires accurate control of cell temperature.
Maccor offers industry leading measurement and control
capability.
Typical Maccor System
(as shown)
These safety features were
designed into the very first
Maccor test systems because
from the beginning lithium
batteries had high energy
densities and the potential for
violent failures which could
cause severe damage to a
facility and the people that
work there. With Maccor these
dangers were very important
from the beginning and remain
very important today.
Maccor Model 4200
Test System
* 16 Independent
Test Channels
* 4 Current Ranges
(5A, 150mA, 5mA, & 150uA)
* 0 - 5V
Maccor Model MTC-020
Temperature Chambers
* 3 Independent Chambers
* - 20° C to 100° C
* Accuracy: +/- 0.5° C
No other device or
equipment is needed
22
Battery Power * Fall 2016
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Table of Contents for the Digital Edition of Battery Power - Fall 2016