Great news! BatterySpace.com supplies Battery Management System (BMS-LF24) for Li-Fe-PO battery pack up to 77V (24 cells or packs in series) with Max. 500A rate.

BMS-LF24 consists of one Master Module, coupled upto 24 individual Slave Modules. Each Slave module can control one 3.2V cell or group of parallel Li-Fe-PO 3.2V cells without two 500A rated solid relays. The BMS-LF24 aggregates cell data and coordinates cell balancing. Outputs are provided to control solid relays to perform protection functions. All battery data is available via RS-232 in text format, making this BMS an excellent choice for logging and battery system development. By combining multi BMS-LF24, you can built and manage a Li-Fe-PO battery pack for as high a voltage as you want.

Features and Specifications of Master Module:

• Relay Operating Voltage: 8-32VDC to run solid relay - not included (EV-200 relays require min 9VDC to energize the relay)
• Internal Fuse: 5A Fast Acting, 1/4" x 1 1/4"
• Typical Supply Current: 15mA (not including Solid Relay consumption)
• Size (LxWxH): 12.00x4.87x1.20", included relay mounted on the Master Board
  • Note: the height is determine by the relay being use!
• Innovative cell balancing scheme is efficient yet tolerant of capacity mismatch
• Simultaneous sampling of all cell voltages for insensitivity to current draw
• Fully isolated from cells
• Each Master Module can handles 2-24 Slave Modules (up to 77V Li-Fe-PO Pack) without 500A Max. charging / discharging
• Separate outputs for charge and discharge contactors
• Audible warning codes for different faulty conditions (BMS will cutoff when battery is above or below normal voltage, high temperature or wrong polarity)
• Automatic recovery from faulty conditions
• Factory configured for Li-Fe-PO cells (BMS for Li-Ion cell is available at related product section below )
• Slave Module - each module can handle one cell or group of parallel cells. ( please order separately at related product section below )
• Two 500A EV-200 solid relay (contactors) are included on the Master Module and can be remove from the board and put on any desired location if you have a height limitation:
  • Relay Type: Tyco EV200AAANA
  • Coil Voltage: 9-36Vdc
• All pack data available via RS-232 (CAN or Optional RS-485). See Example BMS-LF24 Data Output at below

Cell voltage is reported in mV, and cell temperature in 10ths of a degree C. This data maybe logged on a computer running HyperTerminal, etc. or used directly by other system components.
cycle counter: 0x00000C79
Cell Temp Volt Flag
0000 0218 3079 10
0001 0231 3083 10
0002 0231 3091 10
0003 0218 3075 10
Flags: C:-- F:0000->0000 E:15->15->15
cycle counter: 0x00000C7A
Cell Temp Volt Flag
0000 0218 3079 10
0001 0231 3082 10
0002 0231 3090 10
0003 0218 3075 10
Flags: C:-- F:0000->0000 E:15->15->15

• Functions for protection (for one Slave Module)
  • Cut-off charging power if any cell or group voltage beyond 3.6V, and auto-recover if below 3.6V
  • Cut-off charging power if any cell or group temperature beyond 60^oC, and auto recover if temperature below 60^oC
  • Cut-off discharging power if any cell or group 's voltage below 2.65V, and auto-recover if voltage > 2.65V
  • Warning: no protection on Max. charging / discharging current. You must control charging / discharging current based on battery cell or group's specification with appropriate relays and external fuse (not included).
• Charger is not included. You can choose a DC power supply based on your desired battery pack voltage and capacity.
  • Power supply voltage = 3.65V x number of cells or groups . Example: 77V pack, charger voltage shall >88VDC
  • Max. current in DC power supply shall same as Max. charging current specified by Li-Fe-PO cell
• Please click picture below to see some examples on how to build battery pack using BMS

Applications:

• Electric Vehicle
• Hybrid and Plug-in Hybrid Car
• Robotic
• Solar Car
• Power for Remote Monitoring
• Anything that needs to go faster, farther, higher, deeper, lighter, or longer

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