Author Topic: 18650 Cell voltage monitoring  (Read 405 times)

0 Members and 1 Guest are viewing this topic.

Offline Nitin25

  • Newbie
  • Posts: 2
18650 Cell voltage monitoring
« on: May 01, 2019, 05:27:08 am »
Does anyone worked on battery monitoring system ?

While monitoring 18650 cells How to sense individual cell voltage with the help of microcontroller. As microcontroller accept up to 5 volt.
So if I connect few number of cells in series voltage crosses the 5 volt limit. Voltage divider circuit is fine at certain series cells. But it has very very bad efficiency.
So anyone have idea how to measure individual cell voltage ??
 

Online beanflying

  • Super Contributor
  • ***
  • Posts: 3707
  • Country: au
  • Toys so very many Toys.
Re: 18650 Cell voltage monitoring
« Reply #1 on: May 01, 2019, 05:46:23 am »
Firstly Welcome.

Secondly DO NOT CROSS POST and start multiple topics about one project.

Quote
Hello ,
Could you help me to design battery monitoring system.
How I can monitor individual cell if more number of cells connected in series.As microcontroller works on 5 volt.
So how to monitor those cells.
Please help me out !!

Thirdly NO I will not design you a system in private because you sent me a PM.  ;)

Fourthly I and others may help you with your project if you give some details of it. So how many 18650 cells what BDLC motor and controller ...... We can not read minds.  :)
Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline digsys

  • Supporter
  • ****
  • Posts: 2037
  • Country: au
    • DIGSYS
Re: 18650 Cell voltage monitoring
« Reply #2 on: May 01, 2019, 06:03:19 am »
Quote from: Nitin25
Does anyone worked on battery monitoring system ?
While monitoring 18650 cells How to sense individual cell voltage with the help of microcontroller. As microcontroller accept up to 5 volt.
So if I connect few number of cells in series voltage crosses the 5 volt limit. Voltage divider circuit is fine at certain series cells. But it has very very bad efficiency.
So anyone have idea how to measure individual cell voltage ??
This is a BMS I designed and use on EVs, mostly solar cars. A few teams have used it as well. All circuits and layouts are provided free to use.
The main IC is a differential op-amp, capable of monitoring voltages of up to +/- 250VDC difference. That's app 50+ series Li cells.
https://pbase.com/digsys/image/161061565
More pix at https://pbase.com/digsys/projects
Hook it up to any LV MPU etc
Hello <tap> <tap> .. is this thing on?
 

Offline Yainakorn

  • Newbie
  • Posts: 1
  • Country: th
Re: 18650 Cell voltage monitoring
« Reply #3 on: May 02, 2019, 07:14:06 am »
I think there is a confused answer to this post.


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf