LEM Launches Industry-First Hybrid Battery Sensor for Electric Vehicles

Published: 18 Jun 2025

Author: Precedence Research

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LEM, the worldwide leader in electrical measurement solutions, has just introduced an industry-altering technology into the electric vehicle (EV) market. A hybrid current sensor that combines the technologies of a shunt and a Hall effect into one small package. Called the Hybrid Supervising Unit (HSU), the new device is the first to combine these two popular methods of current sensing in a single component. Designed to provide the utmost safety, compact design, and cost-effectiveness, the HSU was created with high-voltage EV battery management systems (BMS) in mind and was not compromised in terms of precision and functionality.

Current sensing in electric vehicles must be safe and accurate in order to have real-time monitoring of the battery's health, state of charge, and/or overall efficiency. Conventionally, BMS architectures have needed discrete devices to support low-resistance shunt measurements, and galvanically-isolated Hall effect sensors. HSU by LEM solves these problems by integrating both technologies in a plug-and-play solution with a very small footprint that can easily fit in standard battery disconnect units (BDUs).

The HSU is aimed to sustain the most rigid automotive safety measures. It allows system developers to achieve the top level of automotive safety integrity level D (ASIL D), the highest level of the ISO 26262. Furthermore, the isolation of the signal paths of the shunt and Hall elements, and NTC temperature compensation of the thermal accuracy terminate a robust, stable signal under all conditions. 

As a manufacturer, the hybrid sensor cut down the installation and testing cycle times by a drastic margin, cutting operational costs and making logistics easy on EV makers. Its modularity enables next-gen vehicle upgrades with no need to re-work the mechanical arrangement or the power circuits. The smaller size of the HSU also allows the OEMs to better utilize their space-starved battery enclosures and increase the overall vehicle efficiency. Additionally, LEM raises a new industry standard by providing a sensor that is capable of adjusting to such conditions whilst remaining regulatory compliant and cost-effective.

Executive's Statement

Laurent Jaffart, CEO, LEM

“At LEM, we are committed to shaping the future of electric mobility through innovation. The HSU directly reflects our mission to design cutting-edge solutions that help customers achieve higher efficiency, greater safety, and faster time-to-market. With this launch, we’re delivering a new product and redefining what’s possible in EV battery sensing.”