High charge measurement accuracy for Li-ion EV batteries

CAB 1500 current sensor provides high accuracy for EV charge measurement

The CAB 1500 current sensor from LEM provides high performance for accurate battery charge level measurement

One of the biggest issues in the EV sector is the need to develop vehicles that can travel the furthest possible distances between charges and so design engineers are continually searching for sensors that can offer high levels of efficiency and accuracy.

The CAB 1500 from LEM is an automotive grade design sensor that uses fluxgate transducer technology to deliver the high accuracy and low offset required for reliable coulomb counting – measuring the discharging current of Li-ion batteries to estimate their state of charge (SoC). The CAB series is compliant with the ISO 26262 functional safety standard (to automotive safety integrity level C) as well as easy application through a controller area network (CAN) interface offering 500 kbps.

The CAB 1500 open loop fluxgate sensor can be busbar or panel mounted and combines high resolution up to 0.1% with the lowest offset and highest accuracy.

As well as offering an extended current range up to ±1500A and compatibility with 800V applications to the IEC 60664-1 standard, the new sensor boasts non-intrusive measurement for full galvanic isolation up to 2.5kV. Other features include low power consumption VS shunt technology and 0.5% total error over temperatures from -40°C to +85°C.

Jonathan Newell
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