LEM Unveils Revolutionary High-Voltage Battery Sensor Combining Shunt and Hall Effect Technologies
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**June 22, 2025**
**3 min read**
LEM, a specialist in electrical measurement technology, has launched an innovative current sensing unit designed for battery management in electric vehicles (EVs). This groundbreaking product, named the **Hybrid Supervising Unit (HSU)**, is the first of its kind to integrate both shunt and open-loop Hall effect technologies into a single component, effectively addressing the demands for compact size, affordability, and enhanced safety in EV battery management systems.
Jérémie Piro, Product Manager for Battery Management Systems and Battery Storage at LEM, stated, “The HSU represents a significant innovation in sensor technology by merging shunt and Hall effect sensing into one component. This integration streamlines system architecture, enhances safety, and facilitates effortless upgrades without the need to change the mechanical layout. Additionally, it lowers the total bill of materials (BOM) and reduces cycle time for customers.”
The high-voltage Battery Management System (BMS) in an EV serves three primary functions: managing the battery’s state of charge and health, ensuring the safety of the system and the end user, and executing cell balancing to optimize battery performance. Traditionally, engineers have relied on two separate devices—a shunt for measuring up to 2000A and an isolated current sensor for the same measurements. Now, LEM has combined the capabilities and performance of both technologies into one unit, integrating it into the Battery Distribution Unit (BDU). The BMS collects signals from both the shunt and the current sensor for optimal functionality.
At the BDU level, the HSU offers:
– A minimal footprint, weight, and cost (BOM).
– Reduced integration effort for quicker time to market.
– Simple system upgrades without affecting the mechanical layout while improving safety.
At the BMS level, the HSU allows system developers to easily achieve the ASIL D safety level required for EVs. The shunt features a very low resistance of 25µΩ, while the Hall effect component is galvanically isolated, offering accuracy of 2% at 500A and 5% at 2000A. Signal communication lines are kept separate (one for the shunt signal and another for the analogue or digital bus for the Hall part), and the unit includes an NTC (Negative Temperature Compensation) signal for shunt temperature compensation. The current measuring range extends up to ±2000A for 10 seconds for both components, and it operates over a wide temperature range of −40°C to +125°C.
The HSU is unique in the market as it combines two technologies within a standard shunt footprint. It is designed as a plug-and-play unit for easy installation. Initially, LEM offers the **HSU00** version, with **HSU01** set to follow in June. These units are compatible with the two most common BDU busbar sizes: 84 x 36 x 3mm (HSU00) and 84 x 20 x 3mm (HSU01). Samples are currently available.
Looking ahead, LEM plans to expand its HSU lineup by introducing new technologies, such as combining a shunt with a coreless Hall-effect part. The objective is to continuously reduce the size and cost of these devices while enhancing their performance.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/lem-launches-innovative-high-voltage-battery-sensor-integrating-shunt-and-hall-effect-technologies/
