We have an request of BMS scheme applied to mobile robots is required as follows:
1. 48V system, lithium iron phosphate cell, battery number <=20;
2. Voltage acquisition and bidirectional low side current acquisition (shunt) function;
3. It has functions of passive balance and open circuit detection.
4. Is there a scheme (similar to gauge) or open algorithm support for SOC and SOH calculations?
5. Which device ltc6811-1, ltc6811-2 and LTC683 are more suitable for our application?
6. Can you provide demo board and related demo program for reference?
Thank you very much!
I think you can use LTC6812 , 15 channel cell monitor IC. It is best suited for 48 volt application.
Please go through this link you will find all its related documents.
Do ping me if you need any additional support.
Thanks a lot for the feedback.
Our current battery pack has a maximum of 16 strings, which may make LTC6813 more suitable for our application. There are the following questions:
3. Does LTC6813 currently have design documents other than datasheet? If yes, could you please provide?
Everything which you have mentioned is quite possible. Please go through the following link where you will find the datasheet and design documents. The datasheet explains how you can connect lesser cells to 6813 and rest all information related to design is also available in the given link..
In the datasheet of LTC6813-1 there is a ref for how to connect to 14 cells and 16 cells on page 83
How can I adapt for 15 cells, should I cut off from the top cells, remove connection to s14 ? I am confuse because in 16 cells ref it removes the s12. Is there any rules apply to this case ?
You can either short 3 unused pins directly to the highest cell or equally distribute between MUX(es) . Since you are using an odd cell configuration you can connect unused pins to the highest cell to make the schematic simpler. But if you want to obtain better measurement synchronization you can short C16,C17,C18 and C11,C12. Open unused S pins.
But, as mentioned above, I will recommend using LTC6812 for a 15 cell application to get best measurement results.
Thank you Abhishek,
It is clear now. We use LTC6813 because we have 2 configurations on a same board 16 cells and 15 cells.