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                                                                         Rozna ulica 20, 6230 Postojna, Slovenia 
                                                                 e-mail: [email protected]

www.rec-bms.com

 

 

 

 

 
 

ACTIVE BATTERY MANAGEMENT SYSTEM  

REC ACTIVE BMS 

 

 

 

 

 

Features: 

 

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robust and small design 

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4 cells 

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single cell voltage measurement (0.1 – 5.0 V, resolution 1 mV) 

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single cell - under/over voltage protection 

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single cell internal resistance measurement 

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SOC and SOH calculation 

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over temperature protection  

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under temperature charging protection 

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active cell balancing up to 2.5 A DC per cell  

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shunt current measurement (resolution 20 mA @ ± 500 A) 

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2 galvanically isolated user defined multi-purpose digital output 

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2 programmable relay (normally open or normally closed) 

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galvanically isolated RS-485  communication protocol 

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CAN communication (on request) 

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error LED + buzzer indicator  

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PC user interface for changing the settings and data-logging (optional accessory) 

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hibernate switch 

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one IP65 protected connector for all connections 

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one-year warranty 

Summary of Contents for ACTIVE BMS 4S

Page 1: ...perature protection under temperature charging protection active cell balancing up to 2 5 A DC per cell shunt current measurement resolution 20 mA 500 A 2 galvanically isolated user defined multi purp...

Page 2: ...k current temperature and cell s voltage determine state of charge SOC State of health SOH is determined by comparing cell s current parameters with the parameters of the new battery pack The BMS defa...

Page 3: ...REC ACTIVE BMS 4S 3 www rec bms com System Overview Figure 1 System overview BMS Unit Connections Figure 2 BMS unit front panel function overview...

Page 4: ...oupler charge collector 15 Optocoupler charge emitter darlington reverse protection diode polyfuse 16 Optocoupler discharge collector 17 Optocoupler discharge emitter darlington reverse protection dio...

Page 5: ...ly please go to website http www te com catalog pn en 776164 1 RQPN 776164 1 and read connector assembly datasheet AMPSEAL Automotive Plug Connector and Header Assembly in Application Specification an...

Page 6: ...or pin designator pin designator 1 2 AGND 3 B 4 A 5 6 5V to AGND 7 8 9 Galvanically isolated RS 485 EN 61558 1 EN 61558 2 serves for logging and changing BMS parameters Dedicated PC BMS Control Softwa...

Page 7: ...s with how many BMS units are connected then it sends the values in float format B T E M BMS temperature BMS first responds with value 1 then it sends the values of the BMS temperature sensor in float...

Page 8: ...ent coefficient Returns float value R A Z L R A Z L x xx Package cell difference Returns float voltage V C H E M C H E M xxx Li ion chemistry Returns unsigned char value S O C H S O C H x xx Charger S...

Page 9: ...een is turned on in 1 s intervals if the BMS is powered Error LED red is turned on in case of system error and blinks number of error with 50 duty cycle Between every number blinking a small timeout i...

Page 10: ...nge is above 20 A cells internal resistance is calculated Moving average is used to filter out voltage spikes errors Battery Pack Temperature Measurement Battery pack temperatures are measured by Dall...

Page 11: ...ient are taken into consideration at the SOC calculation Li Po chemistry algorithms have an additional voltage to SOC regulation loop inside the algorithm Actual cell capacity is recalculated by the n...

Page 12: ...n drive small signal relays or LED diodes Fig 7 shows two different connection schematics Both outputs can be used to drive LED diodes for charge discharge relay indication Both digital outputs can be...

Page 13: ...ontactor is turned on High current spikes degrade the contactor cells and input capacitors in the electronic device Fig 8 shows contactor connection with or without the pre charge circuit Figure 8 Con...

Page 14: ...n the charger 3 Cell voltages differs more than set BMS will try to balance the cells 5 s error hysteresis 20 mV voltage difference hysteresis Charging is enabled discharging is enabled Charge optocou...

Page 15: ...is Charging is disabled discharging is disabled Charge optocoupler is disabled discharge optocoupler is disabled Turn off the BMS and check the cells connection to the BMS and fuses Restart the BMS If...

Page 16: ...nit can be also supplied without the enclosure if an application is weight or space limited The dimensions of the BMS including connector without the enclosure are 109 mm x 100 mm x 38 mm Sufficient c...

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