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Battery Cell Voltage Emulation

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Battery Cell Voltage Emulation
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Battery Cell Voltage Emulation

Additional hardware for HIL simulation

For the HIL test for battery management systems (BMS), dSPACE provides the high-precision EV1077 Battery Cell Voltage Emulation Board. The board makes it possible to simulate high-voltage batteries at cell level.

At A Glance

For the HIL test for battery management systems (BMS), high-voltage batteries have to be simulated at cell level. To make this possible dSPACE provides the high-precision EV1077 Battery Cell Voltage Emulation Board. Due to its compact size, up to 32 cells can be combined in one 19'', 3-U module or up to 128 cells in a 19'', 12-U rack.

Technical Details

EV1077 Battery Cell Voltage Emulation Board 1)

Hardware structure

  • 32 cells per 19" 3-U module

Output voltage

  • 0 ... 6 V

Resolution

  • 120 V

Precision (across working temperature range)

  • 1.5 mV

Working temperature (environment)

  • 10 ... 50 C

Maximum current (sink/source)

  • 1 A, switchable in parallel

Isolation

  • 60 V between the cells of a module
  • 1000 V between the cells and the environment

Connection

  • Ethernet, e.g., as interface to SCALEXIO

Maximum update rate for all cells

  • 1 kHz

Fault simulation

  • Broken wire between ECU and battery
  • Short circuits between cells

 1) Technical modifications possible.

Emulation Electronic Setup

Cell voltage emulation is performed with several EV1077s. The number of these controllable buffer amplifier boards is configured to match the battery type. The boards supply a continuously adjustable voltage, in the range 0 to 6 V. This relatively wide range means that damaged cells can be emulated. For example, a voltage higher than the nominal voltage simulates a cell's increased internal resistance during charging.
The voltage is output with a precision of 1.5 mV across the entire working temperature range, and with a precision of better than 1 mV within a reduced temperature range. The voltage is galvanically isolated, allowing the modules to be connected in series up to a voltage of 800 V. A reference value step is corrected completely in less than 500 s. Fast data transmission means that a change to all the cell's voltages takes less than 1 ms.
The maximum current that can be supplied or sunk is 1 A, which enables testing of passive and active cell balancing strategies. For special requirements, up to four modules can be connected in parallel to quadruple the maximum current. dSPACE's Automotive Simulation Models are ideal battery simulation models.

 

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