Smart BMS Compatible with ENNOID-BMS for 30-150V Battery Pack

Option :

MKBMS is based on the modular BMS of LTC68XX and STM32 MCU, and is connected to one or more slave boards and integrated integrated boards of different sizes through the ISOSPI interface. The modular BMS can be configured for various applications with battery voltages within 150V.

MKBMS is developed based on the open source materials of DieBieMS and ENNOID BMS. Currently MKBMS is compatible with ENNOID firmware. Here, a special thanks to the developers of open source BMS materials.

MKBMS Slave Board Features:

MKBMS LV Master Mini Board Features:

l Scalable & isolated 1000VDC+

l Compatible with MKBMS Master boards

l From 5 to 18 cell levels monitoring per board

l Daisychain Master/Slave ISOSPI communication

l Up to 9 temperature sensors per slave

l Parameters fully programmable through an easy to use graphical user interface

l 33 ohm balance resistors (0.125A capacity) on all channels

l Self powered by monitored cells

l 1.2mV accuracy, -40 to 120C  operation

l Extra low power consumption (Sleep mode = 6uA)

l Molex SL horizontal connectors for balance & temperature. (Comes with male, female + crimps)


LTC6811 :  Up to 12 cells voltage monitoring  &  1+4 temperature sensors* per slave

LTC6812 : Up to 15 cells voltage monitoring  &  1+8  temperature sensors* per slave

LTC6813 : Up to 18 cells voltage monitoring  &  1+8  temperature sensors* per slave

*First temperature channel is used by slave board

l With charger voltage measurement, humidity sensor, isolated on-board 5V power supply for isolating CAN bus interface and USB Type-C

l 30V to 150V operation

l Voltages measurements for load & battery pack

l Bi-directional current monitoring (up to 2500A pulsed, 500A continuous)

l Isolated charger detection circuit

l Isolated CAN bus interface

l Daisychain Master/Slave ISOSPI communication

l Single PCB pattern for bolt-on contactor

l It can internal power supply or external power supply voltage is 12V

l Integrated predischarge circuit

l USB & serial interface for configuring and firmware upgrades with the ENNOID-BMS-Tool

l OLED display output

l ON/OFF toggle switch input

l SWD burn debugging or update firmware interface


Pack configuration examples:

MKBMS monitoring 23S pack :

 2 x LTC6811-12S : 12S + 11S ( Optimal)

 2 x LTC6812-15S : 12S + 11S (Two slaves partially loaded)

 2 x LTC6813-18S : 12S + 11S (Two slaves partially loaded)

MKBMS monitoring 27S pack :

3 x LTC6811-12S: 9S + 9S + 9S (Three slaves partially loaded)

2 x LTC6812-15S: 14S + 13S  (Optimal)

2 x LTC6813-18S: 14S + 13S (Two slaves partially loaded)

MKBMS monitoring 29S pack :

3 x LTC6811-12S: 10S + 10S + 9S (Three slaves partially loaded)

2 x LTC6812-15S: 15S + 14S  ( Optimal)

2 x LTC6813-18S: 15S + 14S (Two slaves partially loaded)

MKBMS monitoring 30S pack :

3 x LTC6811-12S: 10S + 10S + 10S (Three slaves partially loaded)

2 x LTC6812-15S: 15S + 15S  ( Optimal)

2 x LTC6813-18S: 15S + 15S (Two slaves partially loaded)

MKBMS monitoring 35S pack :

3 x LTC6811-12S: 12S+12S+11S (Good)

3 x LTC6812-15S: 12S+12S+11S (Three slaves partially loaded)

2 x LTC6813-18S: 18S + 17S (Optimal choice)

*For uneven cell count in series, only the last slave board in the daisy-chained loop should have one cell less connected than the other slaves. Ex: 39S = 10S + 10S + 10S + 9S


MKBMS battery management system implements the following functions:

  1. Current and voltage protection: protect the battery pack from overcharge and overdischarge, thereby extending the cycle life.
  2. Battery health monitoring: monitor the internal resistance of a single battery and the monitoring capacity of the battery pack.
  3. Thermal management: Overheating and under-temperature protection with fan control for cooling or heating.
  4. Support batteries: Li-Ion, Li-Polymer, Li-Phosphate
  5. Intelligent battery balance: passive balance and active balance
  6. Rugged and anti-EMI
  7. Field programmable
  8. Current limit calculation
  9. Fully programmable CANBUS interface, programmable structure of all CAN messages
  10. Drift state of charge
  11. Reliability, speed and accuracy
  12. Integration with other devices
  13. Multiple BMS units connected in series
  14. Current sensor support
  15. Isolation from fault detection
  16. Automotive grade design, automotive grade locking connector
  17. Software for data logging and programming


MKBMS can be roughly divided into three aspects: automobile, industry, and consumption:

  1. Electric vehicles;
  2. Electric patrol car;
  3. Scenic sightseeing car;
  4. Handling robots;
  5. Automatic forklift;
  6. Electric bicycles;
  7. Electric skateboard;
  8. Electric tools;
  9. Consumer robots, etc.
BMS OLED diagram
BMS OLED- Step-down module cable connection
BMS Relay wiring
BMS Step-down module wiring diagram
wiring diafram of smart BMS
wiring diagram for samrt BMS
BMS Switch-jumper cap wiring

Shipping List:

MKBMS-LV Master Mini Package

1X   PCBA board MKBMS-LV Master Mini V1.4

2X   GH1.25 single head 2P line

1X   GH1.25 double head 2P same direction line

3X   HY2.0 single head 2P line

2X   GH1.25 single head 5P line

1X   GH1.25-5P to Dupont line

1X   USB cable type-C data cable

1X   2.0MM jumper cap

1X   1.3 inch OLED display LCD screen module

1X   Switch


LTC6811-12W-AL V1.2 Slave Board Package

1X   PCBA board LTC6811-12W-AL V1.2 slave board

2X   GH1.25 double head 2P same direction line

1X   HY2.0 single head 5P line

1X   HY2.0 single head 13P line

4X   Nylon column

4X   Nylon nut


MKBMS Master Board + Slave Board Package

1X   PCBA board MKBMS-LV Master Mini V1.4

2X   GH1.25 single head 2P line

1X   GH1.25 double head 2P same direction line

3X   HY2.0 single head 2P line

2X   GH1.25 single head 5P line

1X   GH1.25-5P to Dupont line

1X   USB cable type-C data cable

1X   2.0MM jumper cap

1X   1.3 inch OLED display LCD screen module

1X   Switch

1X   PCBA board LTC6811-12W-AL V1.2 slave board

2X   GH1.25 double head 2P same direction line

1X   HY2.0 single head 5P line

1X   HY2.0 single head 13P line

4X   Nylon column

4X   Nylon nut


Overall Dimension

Option 1:LTC6811-12W-AL V1.2

Product Size: 100*60mm

Net Weight Of Product: 31.8g

Package Size: 140*110*50mm

Packing Weight: 120g


Option 2:MK-BMS-LV Master Mini

Product Size: 83*85mm

Net Weight Of Product: 62.2g

Package Size: 140*110*50mm

Packing Weight: 180g


Option3:MK-BMS-LV Master Mini + LTC6811-12W-AL V1.2

Product Size: 100*85*85mm

Net Weight Of Product: 190g

Package Size: 140*110*100mm

Packing Weight:300g

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