Ultra-Accurate ams Sensor Interface Integrated into Battery Management Systems in Leading Electric Vehicles
September 17 2014 - 3:00AM
Business Wire
Current and voltage measurements captured by AS8510 help the
battery management system in the BMW i3 for accurate range
assessment
ams AG (SIX: AMS), a leading provider of high performance analog
ICs and sensors, today announced that the BMW Group is using the
AS8510, an integrated automotive sensor interface, to provide
extremely accurate battery voltage and current measurements in its
‘i3’ series electric vehicles (EVs).
The BMW i3 model that is in volume production today includes an
AS8510 in the battery sensor. The battery management system (BMS)
monitors battery voltage and battery current of the 400V li-ion
battery powering the cars’ electric motors, and ensures the
functional safety of the vehicle’s battery systems.
Optimisation of energy storage and battery life are essential
for EVs in order to provide customers with sufficient range and
reliablity. Accurate current and voltage measurements enable the
BMS to make a highly accurate calculation of a li-ion battery’s
State Of Charge (SOC). This means that the driver benefits from an
accurate estimation of the range the vehicle can cover before the
battery is completely discharged.
When backed by a special calibration scheme, the sensor system
in the BMS is able to measure current to an accuracy of just ±0.5%
and voltage to an accuracy of better than ±0.1% over the full
operating temperature range of the AS8510 (-40°C to +125°C) and
over life time. Features of the AS8510, including its zero-offset
architecture, low noise, high linearity, its multi channel
architecture and low drift made the task of designing the i series’
current and voltage measurement system easier than using other
sensor interface architectures.
The AS8510 provides integrated data acquisition front ends,
which include two independent 16-bit sigma-delta ADCs. Measuring
current across a shunt resistor in one channel over a range from a
few milliamps up to 1kA, it provides a digital output via a serial
peripheral interface. Through the second channel it can capture
three different voltage sources simultaneously with current
samples.
The AS8510 is fully compliant with the AEC-Q100 standard. The
device supports the functional safety compliance efforts of car
manufacturers in line with the requirements of the ISO26262
standard.
‘The techniques for monitoring the State Of Charge (SOC) and the
State Of Health (SOH) in electric vehicle batteries are constantly
being refined and improved, and BMW has set a new benchmark in
battery management system design in the new i3 model. ams is proud
to have supported BMW’s advanced implementation of ultra-accurate
battery parameter measurement in the demanding environment of a
vehicle drivetrain,’ said Bernd Gessner, Vice-President and General
Manager of the automotive business unit at ams.
To get more information on the AS8510 Data acquisition IC for
battery management or to order a demoboard visit:
www.ams.com/Sensor-Interfaces/AS8510
Download Press Pictures and Block Diagram at
http://www.ams.com/eng/Press/Press-Releases/
ams AGPatricia Moosburger, Media Relationsphone: +43 (0)
3136 500 31235press@ams.comwww.ams.com
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