Swiss electrical measurement specialist LEM has launched a present sensing part 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 industrial product to combine each measurement applied sciences, in accordance with the Geneva-based firm.
The system 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 elements to attain crucial security ranges whereas measuring currents as much as 2000 amperes.
“The HSU represents a major innovation in sensor know-how, being the primary to mix shunt and Corridor impact sensing right into a single part,” mentioned Jérémie Piro, Product Supervisor Battery Administration Programs 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 overall invoice of supplies and minimizes cycle time on the buyer’s finish.”
The part integrates into battery disconnect models, the place it screens present movement for 3 essential capabilities: managing battery state of cost and well being, guaranteeing system security, and supporting cell balancing optimization. The twin-technology strategy 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 supplies 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 gives the HSU00 mannequin for 84 x 36 x 3 millimeter busbar configurations, with the HSU01 variant for 84 x 20 x 3 millimeter functions 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 contains unfavorable 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 elements present knowledge important for calculating remaining vary, stopping overcharging, and detecting potential questions 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 part measurement and price whereas bettering measurement efficiency.
Samples of the present HSU fashions can be found for analysis by automotive producers and battery system suppliers.
