Lithium Battery Monitor 48 cell
Moderators: GregsGarage, retepsnikrep
-
- Posts: 870
- Joined: Tue Apr 01, 2008 5:27 pm
- Location: Galashiels, Scottish Borders
- Contact:
Re: Lithium Battery Monitor 48 cell
See if Maxim did a demo board for the chip. That may have the answer you need in the documentation/schematic for it.
Greg Fordyce
Daewoo Matiz
http://www.evalbum.com/4191
Daewoo Matiz
http://www.evalbum.com/4191
- dillond666
- Posts: 139
- Joined: Mon May 26, 2008 7:52 pm
- Location: Central Scotland
Re: Lithium Battery Monitor 48 cell
I found a newer revision of the datasheet which had clearer information.
I have linked to my schematic. Most component values have yet to be filled in.
The functionality is barebones. The MCU listens to the heartbeat of the BMS and if it is absent the alarm output will be enabled.
Hi and Low voltage thresholds are set on the pin headers next to the Maxim chips.
The MCU will also switch the charger on and off. MCU knows charger is plugged in because it gets its power on pin 2 of the power connector
and powers an opto on the MCU pin.
http://dillond1.pwp.blueyonder.co.uk/MaximBMS.pdf
Comments?
Derek
Edit : spelling
I have linked to my schematic. Most component values have yet to be filled in.
The functionality is barebones. The MCU listens to the heartbeat of the BMS and if it is absent the alarm output will be enabled.
Hi and Low voltage thresholds are set on the pin headers next to the Maxim chips.
The MCU will also switch the charger on and off. MCU knows charger is plugged in because it gets its power on pin 2 of the power connector
and powers an opto on the MCU pin.
http://dillond1.pwp.blueyonder.co.uk/MaximBMS.pdf
Comments?
Derek
Edit : spelling
Last edited by dillond666 on Sat Jun 16, 2012 11:29 pm, edited 1 time in total.
-
- Posts: 870
- Joined: Tue Apr 01, 2008 5:27 pm
- Location: Galashiels, Scottish Borders
- Contact:
Re: Lithium Battery Monitor 48 cell
The fuses connected to pin 13 will need to be rated at full pack voltage in the case of a open in the pack wiring. Or you can fuse at all the cell connections, right at the cells, which you should do anyway. On my Matiz, I can easily isolate all 4 of my battery packs using a combination of contactors, big red button and removable fuse on a anderson connector. With your system I would have to disconnect the bms from all the cells first before isolating any of my battery boxes. But if you have a single battery box then this is not much of a problem.
Looks good though.
Looks good though.
Greg Fordyce
Daewoo Matiz
http://www.evalbum.com/4191
Daewoo Matiz
http://www.evalbum.com/4191
- dillond666
- Posts: 139
- Joined: Mon May 26, 2008 7:52 pm
- Location: Central Scotland
Re: Lithium Battery Monitor 48 cell
Spotted a few errors,
Error on startup/shutdown circuit on left hand MAX11080 chip.
Changed the alarm output to a switched relay, I think this will be less troublesome.
Put in a link trace between the MAX11080 chip connectors and reduced three of them from 13 to
12 pin, this should help eliminate wiring errors.
Thinking of a cell connector solution but can't find much other than D connectors
revised schematic: http://dillond1.pwp.blueyonder.co.uk/MaximBMS-V0.1.pdf
Derek
Error on startup/shutdown circuit on left hand MAX11080 chip.
Changed the alarm output to a switched relay, I think this will be less troublesome.
Put in a link trace between the MAX11080 chip connectors and reduced three of them from 13 to
12 pin, this should help eliminate wiring errors.
Thinking of a cell connector solution but can't find much other than D connectors
revised schematic: http://dillond1.pwp.blueyonder.co.uk/MaximBMS-V0.1.pdf
Derek
-
- Posts: 870
- Joined: Tue Apr 01, 2008 5:27 pm
- Location: Galashiels, Scottish Borders
- Contact:
Re: Lithium Battery Monitor 48 cell
How about the Mini-fit connectors by Molex and others. Maybe reduce the number of cell connectors to just 2, a male and female so you can't mix them up.
Greg Fordyce
Daewoo Matiz
http://www.evalbum.com/4191
Daewoo Matiz
http://www.evalbum.com/4191
- dillond666
- Posts: 139
- Joined: Mon May 26, 2008 7:52 pm
- Location: Central Scotland
Re: Lithium Battery Monitor 48 cell
Nearly there! Just a little more worrying, checking and double checking.
I feel the scope for cock ups on this board are immense.
My cells are on the boat from China though so I'd better get a move on
I feel the scope for cock ups on this board are immense.
My cells are on the boat from China though so I'd better get a move on
- Attachments
-
- maximpic.png (49.93 KiB) Viewed 33615 times
- retepsnikrep
- Posts: 1387
- Joined: Sat May 26, 2007 4:50 pm
- Location: North Yorkshire England
- Contact:
Re: Lithium Battery Monitor 48 cell
That's impressive.
You don't seem to have a GND for cell1 or am i missing something?
You don't seem to have a GND for cell1 or am i missing something?
Regards Peter
Two MK1 Honda Insight's. One running 20ah A123 Lithium pack. One 8ah BetterBattery Nimh pack.
One HCH1 Civic Hybrid running 60ah A123 Lithium pack.
Two MK1 Honda Insight's. One running 20ah A123 Lithium pack. One 8ah BetterBattery Nimh pack.
One HCH1 Civic Hybrid running 60ah A123 Lithium pack.
- dillond666
- Posts: 139
- Joined: Mon May 26, 2008 7:52 pm
- Location: Central Scotland
Re: Lithium Battery Monitor 48 cell
Hopefully you're missing something The cell numbers represent the connection to the negative terminal of the cell hence 48 and 48+ at the other end.
I've added some ground planes on the bottom layer, one for each group of 12 cells and one for the MCU bit. Board is 160 x 160. I did get the text on the silkscreen back to front on the prog/run jumper though .Final checks then it'll be beyond my control
I've added some ground planes on the bottom layer, one for each group of 12 cells and one for the MCU bit. Board is 160 x 160. I did get the text on the silkscreen back to front on the prog/run jumper though .Final checks then it'll be beyond my control
-
- Posts: 870
- Joined: Tue Apr 01, 2008 5:27 pm
- Location: Galashiels, Scottish Borders
- Contact:
Re: Lithium Battery Monitor 48 cell
dillond666 wrote:The cell numbers represent the connection to the negative terminal of the cell hence 48 and 48+ at the other end.
Interesting numbering scheme, Peter and I have always done it the other way round, label cell 1 neg, cell 1 +, cell 2 +, etc. but there's nothing to say we are doing it right. Glad to see it coming along.
Greg Fordyce
Daewoo Matiz
http://www.evalbum.com/4191
Daewoo Matiz
http://www.evalbum.com/4191
- dillond666
- Posts: 139
- Joined: Mon May 26, 2008 7:52 pm
- Location: Central Scotland
Re: Lithium Battery Monitor 48 cell
I've modified the silkscreen to start at GND and let the numbers represent the +ve cell terminals. I suppose it does make a little more sense
Sent the files off to Iteadstudio, cheaper than PCB Cart but still ended up 3 and a half times the headline price
Really hope I haven't messed this up or It'll be the most expensive beermats I've ever owned
Sent the files off to Iteadstudio, cheaper than PCB Cart but still ended up 3 and a half times the headline price
Really hope I haven't messed this up or It'll be the most expensive beermats I've ever owned
Who is online
Users browsing this forum: No registered users and 5 guests