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Isabellenhütte provides convenient shunt solution for current measurement in e-mobility

The special thing about the new BAC shunt from Isabellenhütte is the unit consisting of a shunt and circuit board, which makes it possible to directly tap the measuring signals. On the one hand, users are thus ensured a reliable transmission of measurement signals and are spared an additional process step on the other.

The technical concept of the innovative precision resistor is unique and allows for a much more flexible and efficient signal transmission than with conventional shunts. The BAC is delivered complete with min-circuit board and a sense terminal for the current measurement.

Instead of using complex solutions, such as welded-on terminal pins, flex cables or a connection to the evaluation electronics on the main circuit board, the measuring signal can be tapped directly by the BAC resistor. A plug connector is used to tap the voltage values in the customer’s higher-level systems.

The resistance values of the copper-manganese shunts BAC are 0.1 mOhm (320 A). Another low-ohmic version is designed for current measurements up to 550 A (0.05 mOhm). The shunt is suitable for power ratings up to 15 W. However, other resistance values are also possible.

Leaner production process and more flexible design
In the field of small and medium quantities in particular, the BAC current sensor offers significant cost advantages due to the simplified processes. It is no longer necessary, for example, to weld on the pins. The main application is the current measurement for electronic battery management systems in forklifts, electric scooters as well as other hybrid and electric vehicles. Other previous applications include current measurements in welding equipment.

Users have more options when designing their products. Since the measuring signals are not evaluated on the application’s printed circuit board, the BAC shunt does not necessarily have to be placed on the electronics.

High-precision and long-term stable measurement results
Another advantage of the shunt design with circuit board is the high-precision, long-term stable measurement results. With the BAC, the Manganin® special alloy designed by Isabellenhütte forms the resistance element, which is welded between two copper strips using an electron beam. Manganin® is characterized by an extremely low temperature dependence. The temperature coefficient TC for the BAC series thus lies in the range 100 ppm/K. By comparison, copper has a TC of 4,000 ppm/K. So if the sense pins are eliminated and the measuring signal can be tapped directly on the underside of the circuit board by the manganese resistance alloy, then the negative impact of copper on the temperature coefficients is also largely eliminated.

Customer-specific designs of the standard product
The BAC shunt is a standard passive component, but can be customized for the respective application, for example, when it comes to the resistance values, the size or the selection of plug connectors. In order to avoid transfer resistances due to oxidation, a version with tin-plated or nickel-plated copper connections can also be supplied. Isabellenhütte guarantees a precise measurement and permanent transmission of measuring signals throughout the entire life cycle and therefore also the process reliability of the entire component.

Exhibitor: Isabellenhuette Heusler GmbH & Co. KG


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