Battery Cell Management Unit (CMU)

Designed for battery engineers and researchers, the CMU allows performing multiple measurements of battery cells, 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 Anode and Cathode electrodes included in the CMU kit enable a 4 contacts measurement of the cell internal impedance and tab 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. Multi-sensor measurements are cross-correlated by the SENSIPLUS Learning Machine (SLM) running on an MCU in the battery module, to stream minimal data to the Battery Management System (BMS).
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.

Specifications

ELECTRICAL
Supply Voltage1.5-4.5V directly powered by the battery cell
Max Current20mA 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
ELECTRICAL IMPEDANCE SPECTROSCOPY
EIS4 contacts EIS measurement of internal Cell Impedance
Frequency40Hz to 100KHz
Ipp Output Sinewave0 to 20mApp
Coherent demodulation1st, 2nd or 3rd harmonic
OutputReciprocal of real or imagery component
Measurement Resolution1mΩ with 200μΩ accuracy at 1KHz
INTEGRATED CMU SENSORS
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%
OPTIONAL CMU SENSORS
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
HIGH VOLTAGE ISOLATION
Protection LevelBasic
Surge Test Voltage5000 VPK
Isolation Rating3000 VRMS
Working Voltage450 VRMS / 637 VPK

Measurements

Applications

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

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