| 1. | EXECUTIVE SUMMARY |
| 1.1. | The scope of this report |
| 1.2. | Who should read this report? |
| 1.3. | Research methodology |
| 1.4. | Conventional battery sensors |
| 1.5. | Advanced sensors and alternatives |
| 1.6. | Regulatory background: Electric vehicles |
| 1.7. | The need for further regulation |
| 1.8. | Sensor technology benchmarking |
| 1.9. | Problems solved by advanced sensor deployments |
| 1.10. | Comparing gas sensing technologies |
| 1.11. | Comparing pressure sensor technologies |
| 1.12. | Comparing strain sensor technologies |
| 1.13. | Player analysis: Individual sensors vs complete package |
| 1.14. | Sensor type benchmarking |
| 1.15. | Remote monitoring and control |
| 1.16. | Comparing remote monitoring methods |
| 1.17. | Interest by region |
| 1.18. | Scope of forecasts |
| 1.19. | Methodologies |
| 1.20. | Advanced battery sensors units sold forecast |
| 1.21. | Advanced battery sensors market value forecast |
| 1.22. | Advanced sensor market 2036 by broad market sector |
| 1.23. | Advanced battery sensor market sector analysis |
| 1.24. | Advanced battery sensor market sector analysis cont. |
| 1.25. | Remote monitoring conclusions |
| 1.26. | Access More With an IDTechEx Subscription |
| 2. | INTRODUCTION |
| 2.1. | The battery management system |
| 2.2. | Generic BMS block diagram |
| 2.3. | BMS topologies |
| 2.4. | BMS core functionality |
| 2.5. | Functions of a BMS |
| 2.6. | Cell control |
| 2.7. | BMS components |
| 2.8. | Battery pack structure |
| 2.9. | Thermal runaway |
| 2.10. | Cell venting events |
| 2.11. | Battery degradation |
| 2.12. | Applications: EVs and BESS |
| 2.13. | Need to improve |
| 2.14. | Avenues for improvement |
| 2.15. | Advanced analytics via alternative sensors |
| 3. | TEMPERATURE, CURRENT AND VOLTAGE: IMPROVEMENTS TO CONVENTIONAL SENSOR DEPLOYMENTS |
| 3.1. | BMS targets: SoC, SoH and temperature |
| 3.1.1. | Conventional temperature sensors |
| 3.1.2. | Temperature sensors |
| 3.1.3. | Accuracy, range and response time requirements for temperature sensors in battery packs |
| 3.1.4. | Thermocouples |
| 3.1.5. | Thermistors |
| 3.1.6. | Resistance temperature detectors |
| 3.2. | Alternative temperature sensors |
| 3.2.1. | Optical fibre sensors: Point sensors and spectral shift |
| 3.2.2. | Optical fibre sensors: Design |
| 3.2.3. | Optical fibre sensors: Fibre Bragg gratings (FBGs) |
| 3.2.4. | Optical fibre sensors: Fabry-Pérot interferometers (FPIs) |
| 3.2.5. | Johnson noise thermometry |
| 3.2.6. | Infrared temperature sensors |
| 3.2.7. | Comparing temperature sensor technologies |
| 3.2.8. | Temperature sensor conclusions |
| 3.3. | Voltage and current sensors: Conventional technologies |
| 3.3.1. | Current and voltage measurements: The current shunt |
| 3.3.2. | Hall sensors and magneto-resistance sensors |
| 3.3.3. | SoC calculation: Coulomb counting |
| 3.3.4. | SoC calculation: Voltage look-up |
| 3.3.5. | SoH estimation |
| 3.4. | Alternative electrochemical state estimation methods |
| 3.4.1. | Advancements in SoH measurement: Electrochemical impedance spectroscopy (EIS) |
| 3.4.2. | How EIS is used |
| 3.4.3. | Advantages of EIS |
| 3.4.4. | Necessary modifications to the battery pack |
| 3.4.5. | Module- vs cell-level EIS |
| 3.4.6. | Marelli |
| 3.4.7. | CSEM |
| 3.4.8. | Conclusions on integration of EIS into battery packs |
| 4. | ALTERNATIVE SENSORS FOR DETECTING THERMAL RUNAWAY |
| 4.1.1. | The need for new approaches |
| 4.1.2. | Advantages of low-power sensor deployments |
| 4.1.3. | State changes during thermal runaway |
| 4.1.4. | The process of battery component degradation during thermal runaway |
| 4.1.5. | Cell venting |
| 4.1.6. | Gas emission |
| 4.1.7. | Gas emission by cathode type |
| 4.1.8. | Gas emission vs. state of charge (SoC) |
| 4.1.9. | Gas sensor requirements |
| 4.1.10. | Cross-sensitivities in gas sensing |
| 4.1.11. | Pressure sensing - the basics |
| 4.1.12. | Pressure trends during thermal runaway |
| 4.2. | Hydrogen emission detectors |
| 4.2.1. | Hydrogen emission |
| 4.2.2. | Post-runaway combustion events |
| 4.2.3. | Principles of thermal conductivity sensing |
| 4.2.4. | Thermal conductivity sensor designs |
| 4.2.5. | Challenges of thermal conductivity sensing |
| 4.2.6. | Amphenol Advanced Sensors: Hydrogen |
| 4.2.7. | Posifa Technologies: Hydrogen |
| 4.2.8. | Chemi-resistive sensing |
| 4.2.9. | Selectivity vs sensitivity |
| 4.2.10. | Hydrogen sensing through chemi-resistive sensors |
| 4.2.11. | Nexceris |
| 4.3. | Volatile organic compound detectors |
| 4.3.1. | Volatile organic compounds: An introduction |
| 4.3.2. | Emission during runaway |
| 4.3.3. | Photoionization detector principle |
| 4.3.4. | Photoionization detectors |
| 4.3.5. | Metal oxide chemi-resistors |
| 4.3.6. | Li-ion Tamer ® |
| 4.4. | Carbon dioxide emission detectors |
| 4.4.1. | Carbon dioxide as a thermal runaway product |
| 4.4.2. | Non-dispersive infrared spectrometry (NDIR spectrometry) |
| 4.4.3. | NDIR CO2 sensor designs |
| 4.4.4. | Chemi-resistive carbon dioxide sensors |
| 4.5. | Carbon monoxide emission detectors |
| 4.5.1. | Carbon monoxide emission from thermal runaway |
| 4.5.2. | Tunable diode laser spectroscopy (TDLS) |
| 4.5.3. | Electrochemical sensors |
| 4.5.4. | Chemi-resistive sensors for carbon monoxide |
| 4.5.5. | Comparing gas sensing technologies |
| 4.5.6. | Gas sensor conclusions |
| 4.5.7. | Aerosol detectors |
| 4.5.8. | Aerosols present in the battery pack |
| 4.5.9. | Detection via light scattering |
| 4.5.10. | Honeywell |
| 4.5.11. | Sensing via ionization detectors |
| 4.5.12. | Pressure sensors |
| 4.5.13. | Pressure build-up during runaway |
| 4.5.14. | Typical pressure in a battery pack |
| 4.5.15. | Capacitive sensors |
| 4.5.16. | Piezoelectric sensors |
| 4.5.17. | Piezoresistive sensors |
| 4.5.18. | Infineon |
| 4.5.19. | Comparing pressure sensor technologies |
| 5. | SENSORS FOR MONITORING BATTERY COMPONENT EXPANSION |
| 5.1.1. | Battery volume changes |
| 5.1.2. | Electrode expansion by material for lithium-ion batteries |
| 5.1.3. | Silicon anode batteries |
| 5.1.4. | Correlating degradation with trends in volume changes |
| 5.1.5. | Dendrite detection: differential pressure |
| 5.2. | Stress/strain detectors |
| 5.2.1. | Stress and strain |
| 5.2.2. | Benefits of stress/strain detection |
| 5.2.3. | Typical pressure in a battery pack |
| 5.2.4. | Strain gauges |
| 5.2.5. | Foil vs silicon |
| 5.2.6. | Thin-film strain gauges |
| 5.2.7. | Optical fibre sensors: Bragg gratings |
| 5.2.8. | Optical fibre sensors: Distributed sensors |
| 5.2.9. | Comparing strain sensor technologies |
| 5.2.10. | Stress/strain sensor conclusions |
| 6. | SENSORS FOR DETECTING MOISTURE PRESENCE IN BATTERY PACKS |
| 6.1. | Moisture presence in the battery pack enclosure |
| 6.2. | Coolant leakage causes |
| 6.3. | Moisture detection via resistance |
| 6.4. | Moisture sensor design |
| 6.5. | Amphenol Advanced Sensors: Moisture detection |
| 6.6. | Humidity and dew points |
| 6.7. | Humidity control during battery manufacturing |
| 6.8. | The importance of dewpoints in a battery pack |
| 6.9. | Relative humidity detection |
| 6.10. | Absolute humidity detection |
| 6.11. | Metis Engineering |
| 7. | REMOTE COMMUNICATION AND LIVE CELL BALANCING |
| 7.1. | Communication protocols in battery packs |
| 7.2. | Important factors in battery pack sensor communication |
| 7.3. | Wired vs wireless |
| 7.4. | Benefits of remote monitoring |
| 7.5. | Proprietary vs standardized |
| 7.6. | Controller area network (CAN) protocol |
| 7.7. | Advantages of CAN |
| 7.8. | RS-485 |
| 7.9. | Universal asynchronous receiver/transmitter (UART) |
| 7.10. | Remote monitoring through wired conversion |
| 7.11. | Ethernet |
| 7.12. | Wireless options |
| 7.13. | Bluetooth Low Energy (BLE) |
| 7.14. | Zigbee |
| 7.15. | Near-field communications (NFC) |
| 7.16. | Wi-fi and cellular networks |
| 7.17. | Menred ESS |
| 7.18. | MOKOENERGY |
| 7.19. | Nuvation Engineering |
| 7.20. | GM Motors |
| 7.21. | Comparing remote monitoring methods |
| 7.22. | Conclusions on remote monitoring BMSs |
| 8. | FORECASTS |
| 8.1. | Advanced battery sensors units sold forecast |
| 8.2. | Advanced battery sensors market value forecast |
| 8.3. | Remote monitoring conclusions |
| 9. | COMPANY PROFILES |
| 9.1. | List of company profile links |