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>> Produkte >> Battery Safety device (BSD)

Battery Safety Device (BSD)


Battery Safety


High energy density and high specific power are two of the key targets in battery research and development. However, both parameters result in fast energy release in case of internal or external battery failures. Additionally the thermal energy content of lithium based batteries is a multiple of the stored electrical energy. Exothermal reactions in case of overcharging or in case of short circuits can result in explosion and fire and can destroy a battery test laboratory. The risk increases with larger batteries and should not be underestimated.

BaSyTec test procedures allow to supervise a test by all monitored signals, as current, temperatures and voltages. However this method does not protect from careless mistakes and it is not independent from the control system.

The BaSyTec Battery Safety Device (BSD) is an optional extension of the BaSyTec Battery Test Systems. It will independently monitor all critical parameters of the battery and it's ambient and will switch off the batterycurrent by locking the main output relay if any parameter exceeds it's safe range





BSD Unit

Technische Daten:

Flyer (pdf)

... further Informationen

Technical Applications



       


The BSD is mechanically included into the BaSyTec Battery Test system but operates completely independently, so offering a second backup safety circuit to the main control system of the BaSyTec Battery Test System. It is recommended for:

All batteries and cells where safety risks are expected, i.e. Prototypes

  • All NiMH Batteries with an energy content of more than 500 Wh
  • All Lithium Batteries with an energy content of more than 100 Wh.
  • All batteries and cells where safety risks are expected, i.e. Prototypes

Technical Data

User Interface

Green light   everything ok

Red light      emergency switch off

LCD Display  showing actual values, also used for
                   configuration and to show critical
                   parameters which lock the system
                   20*4 characters, 85*30.5mm, backlight

6 Buttons   RESET --> leave locked state. This button
                   and disconnecting from mains supply are
                   the only possibilities to unlock the BSD
                   ENTER, left, right, up, down --> switch
                   between screens and configure the device

Temperature inputs

Count          2 per unit

Connector   D-SUB 9-pin female

Mode          4-wire connection

Sensors        Pt100 (optional NTC 6k8)

Resolution    Pt100: 0.05°C

Precision:     2°C

Sample rate 5Hz

Lock delay   400ms to 10s (default 2s)

Analog inputs

(Used for Gas sensors like H2, CO or any other sensor outputs)

Count          4 per unit

Connector   D-SUB 9-pin male

Range         +/-10V (optional +/-20mA), differential

Resolution    16 Bit

Precision      1% FS

Sample rate 5Hz

Lock delay   400ms to 10s (default 2s)

Main voltage

Count          1 per unit

Connector   internally wired to the sense input of
                   the battery test system

Range         0-5V (optional 50V), unipolar, differential

Resolution    16 Bit

Precision      1% FS

Sample rate 5Hz

Lock delay   400ms to 10s (default 2s)

Main current

Count          1 per unit

Connector   internally wired to the current monitor
                   of the battery test system

Range         equal to the current range of the test system

Resolution    16 Bit

Precision      2% FS

Sample rate 5Hz

Lock delay   400ms to 10s (default 2s)

 

Single cell voltages

(optional)

Count          10 per unit

Connector   D-SUB 25-pin male

Range         0-5V, unipolar, differential, common mode
                   up to 50V

Resolution    16 Bit

Precision      1% FS

Sample rate 5Hz

Lock delay   400ms to 10s (default 2s)

External clearance

Count          2 per Unit

Connector   D-SUB 9-pin female

Type            TTL-like input with internal 2k2 pullup
                   Must be connected to potential free relais

                   or optocoupler output

Range         cleared if potential < 0.5V
                   locked if potential > 2.5V
                   0.5V to 2.5V is not allowed

Lock delay   400ms to 10s (default 2s)

External signal out

Count          2 per Unit

Connector   D-SUB 9-pin female (same one as before)

Type            Relais output with changeover contacts
                   max. 24V/1A each

NO output will be closed if output is enabled

calibration

The units will reach the specified precision without calibration.

Parameter readout

(optional)

All measured parameters can be read out and used by the BaSyTec Battery Test System.
For reasons of safety it is not possible to set any parameter this way.

Global enable

There is a global enable signal connecting all BSD’s in a system. So, if one BSD goes into locked state all others can  also lock their outputs.

·        So global parameters (gas sensors, emergency shutdown) need to be wired only to one BSD

·        It can be configured for each input whether a failure will lock all or only one test channel

·        Default is that cell voltage, temperature and current inputs do only lock the affected channel

·        Default is that external clearance and analogue inputs (for gas sensors) will lock all channels