BMS Testing?
- Thread starter rg12
- Start date
john61ct said:
These devices do exist but super expensive and professional and was wandering if there is something affordable.
I can test anything by hand but automation is always best, especially when it comes to testing the balance circuit and watch the current flowing to 20 channels at once.
DogDipstick
100 kW
Just make your own stimulator. How hard can it be?
DogDipstick
100 kW
Lol yes but lets look at what RG wants .
Something to test:
Over current protection ( needs source of overcurrent calibrated to a specific test value of both high and low amps for versatility.. )
LVC cut ( the ability to discharge test batt)
HVC ( ability to have BMS stop the charge at a certain V)
Balance current / string ( current monitor / string, display)
Indv. string voltage; ( ability to switch or monitor the indv. strings.. )
Shut off? BMS shunt value measurement? Field Effect Transistor rating tests? Anyting am leaving out?
The ability to positively test 10-100 BMS / day without error, or question, at glance, without using a brain ( dumb labor ) or smart people time ( expensive management) reliably for sale to people who cannot or are not trained in this way.
I think we want to build a foolproof analog circuit with a couple of pots, a few LEDs, and a voltage reg or two , but what do i know. Pullup here, dial there, whoolah. Breakout the breadboard, lol.
I would have never gotten any good diagnosis done without my Stimulators. ( .. and yes, I said "Stimulator, not "simulator", but same difference, right? Same thing.. but one sounds sexier.. lol...x2 Lol. I know what I said. )
You know, something very similar to the StimJimX. I love my Jimstims, Ive had just about every one.
That little EBIKE test box.... I mean there is that little motor/controller simulator that everyone says is indispensable? It is very usefull to cheaply and quickly without a brain check a motor or controller.
I think RG is onto something here.
Sheeze, you know how to use that ( the simulator), you can prove a very complicated numerical engine and hardware very quick and reliably. Couldn't build EFI without them. You would be feeling round in the dark.
I honestly think this machine that RG eludes to is/could be a very valuable tool for someone who does alot of this stuff for safety and reliability.
Jimstim syling.
https://www.google.com/search?q=Jim...V3knIEHXi4DS8Q_AUoA3oECAwQBQ&biw=1216&bih=950
Something to test:
Over current protection ( needs source of overcurrent calibrated to a specific test value of both high and low amps for versatility.. )
LVC cut ( the ability to discharge test batt)
HVC ( ability to have BMS stop the charge at a certain V)
Balance current / string ( current monitor / string, display)
Indv. string voltage; ( ability to switch or monitor the indv. strings.. )
Shut off? BMS shunt value measurement? Field Effect Transistor rating tests? Anyting am leaving out?
The ability to positively test 10-100 BMS / day without error, or question, at glance, without using a brain ( dumb labor ) or smart people time ( expensive management) reliably for sale to people who cannot or are not trained in this way.
I think we want to build a foolproof analog circuit with a couple of pots, a few LEDs, and a voltage reg or two , but what do i know. Pullup here, dial there, whoolah. Breakout the breadboard, lol.
I would have never gotten any good diagnosis done without my Stimulators. ( .. and yes, I said "Stimulator, not "simulator", but same difference, right? Same thing.. but one sounds sexier.. lol...x2 Lol. I know what I said. )
You know, something very similar to the StimJimX. I love my Jimstims, Ive had just about every one.
That little EBIKE test box.... I mean there is that little motor/controller simulator that everyone says is indispensable? It is very usefull to cheaply and quickly without a brain check a motor or controller.
I think RG is onto something here.
Sheeze, you know how to use that ( the simulator), you can prove a very complicated numerical engine and hardware very quick and reliably. Couldn't build EFI without them. You would be feeling round in the dark.
I honestly think this machine that RG eludes to is/could be a very valuable tool for someone who does alot of this stuff for safety and reliability.
Jimstim syling.
https://www.google.com/search?q=Jim...V3knIEHXi4DS8Q_AUoA3oECAwQBQ&biw=1216&bih=950
DogDipstick said:Lol yes but lets look at what RG wants .
Something to test:
Over current protection ( needs source of overcurrent calibrated to a specific test value of both high and low amps for versatility.. )
LVC cut ( the ability to discharge test batt)
HVC ( ability to have BMS stop the charge at a certain V)
Balance current / string ( current monitor / string, display)
Indv. string voltage; ( ability to switch or monitor the indv. strings.. )
Shut off? BMS shunt value measurement? Field Effect Transistor rating tests? Anyting am leaving out?
The ability to positively test 10-100 BMS / day without error, or question, at glance, without using a brain ( dumb labor ) or smart people time ( expensive management) reliably for sale to people who cannot or are not trained in this way.
I think we want to build a foolproof analog circuit with a couple of pots, a few LEDs, and a voltage reg or two , but what do i know. Pullup here, dial there, whoolah. Breakout the breadboard, lol.
I would have never gotten any good diagnosis done without my Stimulators. ( .. and yes, I said "Stimulator, not "simulator", but same difference, right? Same thing.. but one sounds sexier.. lol...x2 Lol. I know what I said. )
You know, something very similar to the StimJimX. I love my Jimstims, Ive had just about every one.
That little EBIKE test box.... I mean there is that little motor/controller simulator that everyone says is indispensable? It is very usefull to cheaply and quickly without a brain check a motor or controller.
I think RG is onto something here.
Sheeze, you know how to use that ( the simulator), you can prove a very complicated numerical engine and hardware very quick and reliably. Couldn't build EFI without them. You would be feeling round in the dark.
I honestly think this machine that RG eludes to is/could be a very valuable tool for someone who does alot of this stuff for safety and reliability.
Jimstim syling.
https://www.google.com/search?q=Jim...V3knIEHXi4DS8Q_AUoA3oECAwQBQ&biw=1216&bih=950
You get me, I think it exists but it's very expensive (around $5500) for a rack time bms tester, sometimes it's a whole 2 meter tall station.
Most tests people perform are for cut off and that it let's current flow and that's it.
Just a received a pack that was unbalanced and at about 2.5V per cell, charger couldn't charge it, so I connected it to my balancer and charged it up to around 3.7V, connected to the BMS and it now charges and discharges through the BMS.
The thing is, the cells are acting as brand new, keeping perfect balance under load and all is healthy but why did it go out of balance?
Now testing if it balances can take a ton of time which I would like to save by connecting to some kind of simulator and see how it balances and the current flow to each channel.
I'm guessing I would have to go with the super expensive devices that I can't afford right now.
DogDipstick
100 kW
Yeah well you are not the only one to think this is important.
Part 1: Introduction to testing Battery Management systems Software: MATLAB
https://www.youtube.com/watch?v=VcceRI7HObc&t=28s
Published yesterday.
....interesting stuff!Know just bout all ya need to know watching that. lol. Summed up in about 7 min!
