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6 Advanced features
6.1 Control and measurement modes
The BCS-8xx technology is designed to be able to work in DC mode and in AC mode.
- The DC mode controls the current or the voltage in a linear mode. Pulses, staircases
and sweeps can be applied in voltage, current, power and load mode to the cell. The
current mode is the standard and common mode to use a battery cycler.
- The AC mode can control the voltage or the current applied to the cell in a sinusoidal
mode. This is used for EIS measurements.
The principle of a battery cycler is to control either E or I and measure either I or E (respec-
tively). Other control modes like power and load can be performed under the hardware cur-
rent control plus a software control.
6.1.1 Sine generator
In DC control mode, the BCS-8xx hardware includes eight separate control loops (one for
each channel). The channels are independent in the DC control mode.
The AC control mode requires a sine wave generator. Each BCS-8xx module is equipped
with one sine wave generator for 8 channels, so the channels can be controlled in AC mode
only one by one. The sine wave generator will apply the whole frequency sweep on one
channel before to switch to the next one. During this time, the other channels have to wait for
the sine wave generator to be available. While waiting the other channels are placed in float-
ing mode where the DC float voltage is set at:
The last measured voltage for Galvano EIS (GEIS).
The DC voltage of the coming up Potentio EIS (PEIS).
On the curves below, linked techniques OCV-PEIS-OCV have been applied simultaneously
on eight channels of a BCS-8xx. The EIS sweeps are displayed for each channel in a black
circle. They are executed successively on each channel one after the other.
6.2 Temperature measurement
Temperature measurement is possible using a K-type thermocouple. Each channel of BCS-
815 and BCS-810 is equipped with a connector for this kind of temperature probe.
To record the temperature the user has to select and check the box “Record Temp/°C” in
the “record” block of the “Cell Characteristics” tab (see below):
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