MAXKGO STM32(MCU) 30V-150V Smart VESC Master BMS+LTC6812 Slave BMS

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.

 Maybe you need more MKBMS options: https://bit.ly/3EQO9Nt 

MKBMS Master Board ( MKBMS-LV Master Mini ) Features: With charger voltage measurement, humidity sensor, isolated on-board 5V power supply for isolating CAN bus interface and USB Type-C 30V to 150V operation Voltages measurements for load & battery pack Bi-directional current monitoring (up to 2500A pulsed, 500A continuous) Isolated charger detection circuit Isolated CAN bus interface Daisychain Master/Slave ISOSPI communication Single PCB pattern for bolt-on contactor It can internal power supply or external power supply voltage is 12V Integrated predischarge circuit USB & serial interface for configuring and firmware upgrades with the ENNOID-BMS-Tool OLED display output ON/OFF toggle switch input SWD burn debugging or update firmware interface

MKBMS Slave Board (LTC6811-12W-AL) Features: MKBMS slave board is made of aluminum base plate, which has better heat dissipation effect. Scalable & isolated 1000VDC+ Compatible with MKBMS Master boards From 5 to 18 cell levels monitoring per board Daisychain Master/Slave ISOSPI communication Parameters fully programmable through an easy to use graphical user interface 33 ohm balance resistors (0.125A capacity) on all channels Self powered by monitored cells 1.2mV accuracy, -40 to 120C operation Extra low power consumption (Sleep mode = 6uA) Molex SL horizontal connectors for balance & temperature. (Comes with male, female + crimps)       Variant:       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     *The first temperature channel is used by slave board itself. The following 4 or 8 temperature sensors are not in the package lists but means an interface to connect 4 temp sensors at most or to connect 8 temp sensors at most.

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.

4. Support batteries: Li-Ion, Li-Polymer, Li-Phosphate

5. Intelligent battery balance: passive balance 

6. Field programmable

7. Current limit calculation

8. Fully programmable CANBUS interface, programmable structure of all CAN messages

9. Drift state of charge

10. Reliability, speed and accuracy

11. Integration with other devices

12. Multiple BMS units connected in series

13. Current sensor support

14. Isolation from fault detection

15. Automotive grade design, automotive grade locking connector

16. 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.

Shipping list:

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   12MM 3-6V button switch

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

1X  GH1.25 double head 2P red-black line (for master board)  

1X  GH1.25 double head 2P black-white line (for slave board)

1X   HY2.0 single head 5P line

1X   HY2.0 single head 13P line

4X   Nylon column

4X   Nylon nut

 

MKBMS hardware design file:

LTC6811-12W_V1.2

MKBMS-LV_Master_Mini_V1.4