Battery Cell Management Unit (CMU)

Designed for battery engineers and researchers, the CMU allows performing multiple measurements of batteries, supercapacitors or fuel cells while in operation.
The CMU is based on the SENSIPLUS microchip which includes an Electrochemical Impedance Spectrometer with Lock-In Amplifier, measuring 1st, 2nd and 3rd harmonics, a Potentiostat/Galvanostat along with on-chip sensors for Temperature, Relative Humidity and Gassing. The Positive and Negative tab electrodes included in the CMU kit enable a 4 contacts measurement of the cell internal impedance and temperature. Coulomb counting can be performed without shunt resistor and be adjusted for ageing.
An off-chip interface supports external sensors such: strain, pressure, electrolyte leakage and moisture. 
The CMU is chemistry independent; it can be used with Li-ION and Li-Fe-PO4 battery packs, similarly it can be applied to 3b generation of LNMO cells, Supercapacitors and Fuel Cell combinations.


Supply Voltage 2.7-4.2V directly powered by the battery cell
Max Current 35mARMS when reading EIS at best accuracy
Size 20×8.5mm, 2.3mm thickness
Interface Isolated (UL1577 rating) I3C, I2C or SENSIBUS, single data wire bus
Unique Identifier OTP 48bits Unique Device/Cell Identifier, 16bits User Defined
EIS 4 contacts EIS measurement of internal Cell Impedance
Frequency 100mHz to 10kHz spectroscopy
Ipp Output Sinewave 0 to 50mApp
Coherent demodulation 1st, 2nd or 3rd harmonic
Output Real and Imagery components
Measurement Resolution 150μΩ with 10μΩ accuracy at 1KHz
Battery Voltage ±1mV accuracy in range 2.5-4.2V @ 50Hz conversion rate
Environmental Temperature ±0.1°C accuracy in range -40°C to 125°C
Environmental Humidity Relative Humidity 0% to 100% with ±0.2% accuracy
Gas sensing VOCs, Vapors
Anode, Cathode Temperature NTC thermistor 100kΩ ±1%, B value 4700K ±1%
Strain Gauge Cell swelling measurement
Moisture Sensor Electrolyte leakage or moisture sensing
Body Temperature NTC thermistor 100kΩ ±1%, B value 4700K ±1%
Extra sensor port i.e. pressure sensor or additional thermistor
Protection Level Basic
Surge Test Voltage 5000VPK
Isolation Rating 3000VRMS
Working Voltage 450VRMS / 637VPK


Open Data

The following data is made available to data scientists, AI developers and it is free to use. The datasets have been acquired with the CMU battery cell management unit and the SLM-Studio software, these are the same data we use to train our own machine learning models.

Please, feel free to share results of your investigation with us.


  • Battery cells from 1.5 to 4.5 Volts
  • Super, ultra capacitors
  • Fuel cells
  • Other electrochemical storage devices

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