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.
Specifications
| ELECTRICAL | |
| 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 |
| ELECTRICAL IMPEDANCE SPECTROSCOPY | |
| 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 |
| INTEGRATED CMU SENSORS | |
| 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% |
| OPTIONAL CMU SENSORS | |
| 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 |
| HIGH VOLTAGE ISOLATION | |
| Protection Level | Basic |
| Surge Test Voltage | 5000VPK |
| Isolation Rating | 3000VRMS |
| Working Voltage | 450VRMS / 637VPK |
Measurements
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 with us results of your investigation.
Applications
- Battery cells from 1.5 to 4.5 Volts
- Super, ultra capacitors
- Fuel cells
- Other electrochemical storage devices
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