Swiss electrical measurement specialist LEM has launched a present sensing element that mixes shunt and Corridor impact applied sciences in a single unit for EV battery administration programs (BMS). The Hybrid Supervising Unit (HSU) represents the primary business product to combine each measurement applied sciences, based on the Geneva-based firm.
The machine addresses necessities for compact design, value discount, and security compliance in high-voltage BMS. Conventional EV battery monitoring usually requires separate shunt and present sensor parts to attain mandatory security ranges whereas measuring currents as much as 2000 amperes.
“The HSU represents a big innovation in sensor expertise, being the primary to mix shunt and Corridor impact sensing right into a single element,” mentioned Jérémie Piro, Product Supervisor Battery Administration Techniques and Battery Storage at LEM. “This integration simplifies system structure, enhances security, and permits for seamless upgrades with out altering the mechanical structure. Moreover, it reduces the whole invoice of supplies and minimizes cycle time on the buyer’s finish.”
The element integrates into battery disconnect items, the place it screens present stream for 3 important capabilities: managing battery state of cost and well being, guaranteeing system security, and supporting cell balancing optimization. The twin-technology method permits system builders to fulfill ASIL D security necessities mandated for EVs.
Technical specs embody a shunt resistance of 25 microohms and galvanic isolation for the Corridor impact part. The Corridor sensor offers accuracy of two p.c at 500 amperes and 5 p.c at 2000 amperes. Each sections function throughout temperatures from minus 40 to plus 125 levels Celsius and deal with present measurements as much as 2000 amperes for 10-second durations.
The HSU matches commonplace shunt footprints, enabling direct alternative installations with out mechanical modifications. LEM initially affords the HSU00 mannequin for 84 x 36 x 3 millimeter busbar configurations, with the HSU01 variant for 84 x 20 x 3 millimeter purposes scheduled for launch this month.
Sign communication operates by way of separate pathways, with the shunt offering direct voltage indicators whereas the Corridor part communicates by way of analog or digital interfaces. The unit consists of adverse temperature compensation for shunt accuracy throughout working temperatures.
BMS in EVs monitor particular person cell voltages and temperatures whereas controlling charging and discharge charges. Present sensing parts present knowledge important for calculating remaining vary, stopping overcharging, and detecting potential issues of safety.
LEM plans to develop the HSU product line by incorporating extra applied sciences, together with coreless Corridor impact sensors mixed with shunt parts. The corporate goals to additional cut back element measurement and value whereas enhancing measurement efficiency.
Samples of the present HSU fashions can be found for analysis by automotive producers and battery system suppliers.
