LEM Unveils First Hybrid Current Sensing Unit to Elevate Battery Safety

Published: 27 Jun 2025

Author: Precedence Research

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In a first-of-its-kind development, which may result in a transformation of the electric vehicle (EV) battery management system architecture, LEM has released an innovative Hybrid Supervising Unit (HSU) that combines open-loop and shunt Hall effect sensing modalities into one compact package. This innovation is specifically designed for EV solutions, meeting the key requirements of a compact footprint, cost reduction, and enhanced safety for high-voltage battery management systems (BMS). Gathering together two historically distinct current-sensing technologies, the HSU symbolizes a breakthrough in easing the design of EV systems with unquestionably high performances and reliability.

Formally, EV BMS designs have been based on the combination of separated devices with highly accurate current and shunt resistance measurement and the safety-critical galvanically isolated Hall effect sensor. These two systems are effective but may lead to complicated designs due to their expense. This results in higher material costs and integration time. The new HSU invention by LEM reduces the hardware configuration challenges of a multi-technology system. Not only does this minimize the man-hours spent and the cost of a Bill of materials (BOM) and system weight, but it also reduces the development cycle and time to market of the vehicle manufacturer.

The innovation is being launched at a time when the world is experiencing an upsurge in electric mobility, and vehicle manufacturers are facing increased demands to produce safer, lighter, and more cost-effective vehicles without compromising performance. The state of charge (SoC), state of health (SoH), and thermal performance of battery packs are monitored by the BMS. It also guarantees user safety by monitoring faults and performing cell balancing to maximize energy efficiency. Furthermore, with an extremely integrated sensing solution, LEM HSU enables the BMS to perform these functions in a more precise, quicker, and reliable manner.

Executive's Statement

Jérémie Piro, Product Manager, Battery Management Systems & Storage, LEM

“The HSU represents a significant innovation in sensor technology, being the first to combine shunt and Hall effect sensing into a single component. This integration simplifies system architecture, enhances safety, and allows for seamless upgrades without altering the mechanical layout. Additionally, it reduces the total bill of materials (BOM) and minimizes cycle time at the customer’s end. We believe this is exactly what the EV industry has been waiting for.”