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ACTIVE BATTERY MANAGEMENT SYSTEM
Features:
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
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REC ACTIVE BMS
1
Rozna ulica 20, 6230 Postojna, Slovenia
e-mail: info@rec-bms.com;
www.rec-bms.com
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Summary of Contents for REC ACTIVE BMS 4S
- Page 1 Rozna ulica 20, 6230 Postojna, Slovenia e-mail: info@rec-bms.com; www.rec-bms.com ACTIVE BATTERY MANAGEMENT SYSTEM REC ACTIVE BMS Features: robust and small design 4 cells single cell voltage measurement (0.1 – 5.0 V, resolution 1 mV) single cell - under/over voltage protection...
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Page 2: Default Parameters
REC ACTIVE BMS 4S General Description of the BMS Unit: Battery management system (BMS) is a device that monitors and controls each cell in the battery pack by measuring its parameters. The capacity of the battery pack differs from one cell to another and this increases with number of charging/discharging cycles. -
Page 3: System Overview
REC ACTIVE BMS 4S System Overview: Figure 1: System overview. BMS Unit Connections: Figure 2: BMS unit front panel function overview. www.rec-bms.com... - Page 4 REC ACTIVE BMS 4S Table 2: BMS unit male socket connections. connection description Charge Relay Normally closed Charge Relay Fused input Discharge Relay Normally closed Discharge Relay Normally open Discharge Relay Fused input Hibernate switch signal Hibernate switch ground Cell 4...
- Page 5 REC ACTIVE BMS 4S Setting the RS-485 Address: Address of the BMS unit is selected via Address pins. Factory address is 2 . Formula for changing address is: ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ + 2 ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ + 2 ActiveBMS �������������� = 2 ∗ �������������� ������ 3 ∗...
- Page 6 REC ACTIVE BMS 4S BMS Unit Power Supply: BMS unit is always supplied from the 4-th cell connection. BMS Unit Connection Instructions: Connect all necessary connections to the BMS connector first, check the polarities and then plug the female connector into the BMS. When the system components are plugged in, the enable switch can be turned ON and the unit starts the test procedure.
- Page 7 REC ACTIVE BMS 4S Dataflow: Bit rate: 56k Data bits: 8 Stop bits: 1 Parity: None Mode: Asynchronous Table 4: RS-485 instruction set. INSTRUCTION DESCRIPTION BMS ANSWER '*','I','D','N','?' Identification Answer “ACTIVE” Returns 7 float values...
- Page 8 REC ACTIVE BMS 4S 'C','H','A','R', '?'/ End of charging voltage per Returns float voltage [V] 'C','H','A','R', ' ','x.xx' cell 'C','H','I','S', '?'/ End of charging voltage Returns float voltage [V] 'C','H','I','S', ' ','x.xx' hysteresis per cell 'I','O','F','F','?'/ Current measurement zero Returns float current [A] 'I','O','F','F',' ','x.xx'...
- Page 9 REC ACTIVE BMS 4S CAN Communication Protocol (installed and programmed on request): Figure 5: CAN female DB9 connector front view. Table 4: CAN DB9 connector pin designator. designator TERMINATION CANL + TERMINATION + 5V CANH BMS Unit Start Procedure: When the BMS unit is turned ON it jumps into a boot-loader and checks if the user tries to upload a new firmware.
- Page 10 REC ACTIVE BMS 4S Balancing START Voltage: If errors 2, 4, 5, 8, 10, 12 are not present, highest cell voltage rises above Balancing START voltage and current is > 0.2 A (charging stage) the BMS initiates balancing algorithm. A weighted cell voltage average is determined including cells DC internal resistance.
- Page 11 REC ACTIVE BMS 4S Voltage-to-current Coefficient: Different size and resistance shunts can be used, since the voltage-to-current coefficient can be changed in the BMS Control software as 'I','O','J','A',' ','xxxxx' Current is calculated by the voltage drop at the shunt resistor. 1 LSB of the 18 bit ADC represents different current values according to the shunt resistance.
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Page 12: Digital Outputs
REC ACTIVE BMS 4S Digital Outputs: Digital outputs are implemented with galvanical isolation. Darlington optocouplers with diode reverse protection are used. When closed, 0.9 V voltage drop over the digital output should be taken into account. Optocoupler outputs can 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. - Page 13 REC ACTIVE BMS 4S Contactor Connection: Charging/discharging contactors are driven by charge/discharge relays in the BMS. If there is high input capacity (> 2,000 uF) at the charging sources/discharging loads, pre-charge should be used to avoid high current spikes when the contactor is turned on.
- Page 14 REC ACTIVE BMS 4S System Error Indication: System errors are indicated with error LED by the number of ON blinks, followed by a longer OFF state. Table 7: BMS error states. Number of ERROR OWNER ON blinks BMS will try to balance down the...
- Page 15 REC ACTIVE BMS 4S If cells are charged at temperatures lower than operating temperature range, cells are aging much faster than they Wait until the battery’s The temperature is normally would, so charging is disabled too low for charging temperature rises to usable (2 °C temperature hysteresis).
- Page 16 REC ACTIVE BMS 4S BMS Unit Dimensions: Figure 10: BMS dimensions. M4 bolts are preferred to use for mounting. BMS unit 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 contact surface for cooling the balancing resistors should be provided (aluminum recommended).
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