All-in-one inverter, charger and advanced battery management system for enhanced e-mobilitys
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What is Sigma-Cells?
Sigma Cells, Leti’s switched cell technology,
is revolutionizing the world of batteries for e-transportation revisiting the traditional architectures and
taking the multi-cells power source as a key advantage to bring a disruptive solution featuring:
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Improved power conversion efficiency
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Fast charging at no additional cost
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Less bulky and lighter batteries
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Reduced pollution: currently, if only one cell fails, the entire battery is down
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Contraintless electrical vehicle architecture
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Simplified diagnostic & maintenance
Sigma Cells allows smart use of battery cells—the battery brains, by:
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Ensuring continuity of service in the event of sudden cell failure by finding an alternative “safe route”
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Leveraging the “best” cells at a time to ensure longer autonomy and a power reserve
Applications:
Sigma Cells is designed for e-mobility applications regardless of the power size: for example e-cars, e-bicycles, e-buses, etc.
Sigma Cells can also be leveraged for storage applications, among others:
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Network regulation
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Server supply
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Nomadik power banks
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Power tools supplies
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Autonomous building…
What's new?
With e-mobility coming down the road, Sigma Cells addresses tomorrow’s massive demand for power conversion and efficiency. Here is what’s new:
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Inverter function: provides a direct motor drive from the battery pack providing a waveform in line with the motor speed, torque and power
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Integrated fast charger: bidirectional system (current and voltage) enabling a direct recharge on the electrical network
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Advanced BMS with individual and continuous access to any cell unit:
- reducing SoC and SoH error estimation by a factor 2
- improving autonomy of 20%
- improving life time of 15%
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Enhanced performances thanks to native low voltage switching (~3.6V) compared to a classical inverter switching the full battery pack voltage (~400V):
- reducing drastically the switching losses by 100
- reducing the need for cooling
- reducing drastically the CEM emission by 100
What's next?
Leti is working hand-in-hand with industrials to prepare the upcoming e-mobility boom. Researchers are currently working towards enhanced systems and dedicated hardware and software for the automotive industry.