#HM16 Battery management systems.

Scienlab presents its engineering services and products for the entire development chain of battery management systems (BMS) at Hannover Messe, Linear Technology Stand H23, Hall

bmsIn addition to its energy storage test system for characterization of cells, Scienlab will also present a BMS test environment for BMS development and validation, as well as newly developed Module Monitoring Electronics using Linear Technology’s LTC6804 multicell battery monitor.

The LTC6804 is a 3rd generation multicell battery stack monitor that measures up to 12 series-connected battery cells with a total measurement error of less than 1.2 mV. The cell measurement range of 0 V to 5 V makes the LTC6804 suitable for most battery chemistries. With six programmable 3rd order low pass filter settings, the LTC6804 data acquisition rate and noise reduction can be optimized for the application. In the fastest ADC mode, the LTC6804 can measure all 12 cells within 290 µs.

The BMS development at Scienlab is based on the proven V-model, which comprises the phases of design, implementation and testing.

BMS design
Alongside its own BMS, Scienlab also offers specific tailor-made solutions for customer applications. For this purpose, the company determines the necessary BMS functions taking into account the individual customer application, compliance with applicable standards and safety requirements. Specifications are then defined for development as well as the software and hardware.

Implementation of BMS software and hardware
Scienlab offers complete model-based software development including code generation in MATLAB/Simulink. This simplifies ideal parameterization of the BMS for the cells used, and thus ensures optimum capacity utilization and maximum durability of the connected cells.

Since the purely statistical values from the battery datasheet are not sufficient for optimum BMS design, cells are characterized with Scienlab’s energy storage test system in order to determine the required parameters. Non-linear effects are also included here, such as the interdependencies of temperature, current or state of charge.

For model-based development, Scienlab also has a model-based test environment. In this environment, the BMS software can be tested at very early stages of development with the aid of cell models and simulation of the other BMS peripheral devices (e.g., charger). Scienlab also realizes the corresponding BMS hardware for the specific customer application.

BMS validation with Scienlab test systems
The BMS is validated with the Scienlab BMS test environment. Using various emulators that simulate the cells, current and temperature sensors and insulation resistances, reproducible, safe and reliable BMS tests are carried out without the need for real components such as battery cells.

Interfaces with real-time capability permit fast data transfer (1 kHz) between the test systems and the hardware-in-the-loop system. The voltage measuring accuracy of up to ± 0.2 mV and current measuring accuracy of up to ± 2 µA ensure exact voltage and current adjustment and therefore optimum emulation of the cell characteristics. Highly dynamic bidirectional voltage sources permit voltage jumps in less than 80 µs.

 

#scienlab #PAuto @LinearTech

About Eoin Ó Riain

Sé Read-out iris uaithoibríoch, ionstraim agus stiúradh na hÉireann agus an "Signpost" a áit ar an idirlín! Read-out is Ireland's journal of automation, instrumentation and control and the Instrumentation Signpost is it's web presence.
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