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 Voltage2.7-4.5V directly powered by the battery cell
Max Current50mA when reading EIS at best accuracy
Size20×8.5mm, 2.3mm thickness
InterfaceIsolated (UL1577 rating) I3C or SENSIBUS, single data wire bus
Unique IdentifierOTP 48bits Unique Device/Cell Identifier, 16bits User Defined
EIS4 contacts EIS measurement of internal Cell Impedance
Frequency100mHz to 100KHz spectroscopy
Ipp Output Sinewave0 to 50mApp
Coherent demodulation1st, 2nd or 3rd harmonic
OutputReal and Imagery components
Measurement Resolution1mΩ with 50μΩ accuracy at 1KHz
Battery Voltage±1mV accuracy in range 2.5-4.5V @ 50Hz conversion rate
Environmental Temperature±0.1°C accuracy in range -40°C to 125°C
Environmental HumidityRelative Humidity 0% to 100% with ±0.2% accuracy
Gas sensingVOCs, Vapors
Anode, Cathode TemperatureNTC thermistor 100kΩ ±1%, B value 4700K ±1%
Strain GaugeCell swelling measurement
Moisture SensorElectrolyte leakage or moisture sensing
Body TemperatureNTC thermistor 100kΩ ±1%, B value 4700K ±1%
Extra sensor porti.e. pressure sensor or additional thermistor
Protection LevelBasic
Surge Test Voltage5000 VPK
Isolation Rating3000 VRMS
Working Voltage450 VRMS / 637 VPK



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

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