Great Videos and you speak English. How would you use these to go to like a 47s (150V) LiFePO4 system? Does JBD have anything that will work with that high of a voltage?
Omg that’s so true. I fried out my first icharger using a weak power supply. Now I built a portable case for it with a 7s RC LiPo battery with a JK BMS as the buffer built into the case and it works like a dream! Kind of like a smaller portable version of this. However I’ve been looking for a larger solution like this for when we go to drone races. Those batteries are exactly what I need and they look cool. Does the JBD BMS have a good android app?
Yes, the 7-21s JBD boards have a different wiring diagram. The B21 and B20 are connected to the cell while B19 and below can be combined to match your battery. This 7-14s JBD combines the positive most wires together, which is a bit less confusing so always refer to the wiring diagram.
The 7s eMatrix batteries are from Greentec Auto: www.greentecauto.com/hybrid-battery/repurposed-batteries/energy/252-18650s The JBD BMS is from AliExpress found here: s.click.aliexpress.com/e/_mM4eamG Those battery modules come as a complete unit with the cells. We don't make them and neither does the manufacturer so no one else sells them and no one sells just the case without the cells but the price is incredibly cheap, less than a dollar per cell. If you buy cell holders and nickel strip and make your own 7-14s battery pack you can still use these instructions to wire up the BMS.
The 7s eMatrix batteries are from Greentec Auto: www.greentecauto.com/hybrid-battery/repurposed-batteries/energy/252-18650s The JBD BMS is from AliExpress found here: s.click.aliexpress.com/e/_mM4eamG The eMatrix modules are no longer made by the manufacturer and no one else sells them nor does anyone sell only the case without the cells. However GreentecAuto.com sells them incredibly cheap, less than a dollar per cell. Once you factor in the cost of cell spacers, nickel strip and labor it is probably cheaper than making your own pack with your own cells.
Thats awesome. Its a great battery. By the time you factor in cell spacers, nickel strip, labor and time these are an incredible deal. We don't sell the housing separately but you can buy the whole module with the case and the cells here. www.greentecauto.com/hybrid-battery/repurposed-batteries/energy/252-18650s
Uh. Looks like a fire hazard. That's a lot of little bombs that you are mistreating. * Please don't use lead-acid settings to charge a LiFePO4 battery. The BMS is there as a fail-safe, don't depend on it for normal operation. Use proper settings. A 4S LiFePO4 battery is typically charged to 3.55V/cell (14.2V) held there for a while to give the BMS time to balance the cells, then dropped to a float of 3.35V-3.375V/cell (13.4V to 13.5V). The float setting is mandatory to keep the battery healthy. * Do not depend on the BMS to prevent over-charging the lithium pack. BMSs aren't not meant to be used for that function. * You cannot safely use a power supply to recharge a lithium pack, BMS or not. You need to use a proper charge controller and float setting, otherwise you are permanently stressing the lithium-ion pack. You also can't safely hold the pack at its fully charged voltage indefinitely. * Lithium-ion batteries are NOT suitable for UPS applications. LiFePO4 yes, NMC/NCA no. * Do not wire the output of a DC power supply directly to a battery for load-support (don't wire it for charging at all. DC power supplies can only be used for low-battery load-support). That isn't safe. The output of the DC power supply has to go through a bank of schottky diodes. An example of a suitable schottky diode is a 20SQ060, which can dissipate 4A in free air. So have a bank of however many you need for the amperage you want to supply from the power supply. Stripe side points towards the battery. * Your system appears to be missing required fusing in several places. Do not depend on the BMS alone as your sole overcurrent protection device. BMSs aren't meant to be used that way. -Matt
You're absolutely correct for long term use. If you were going to do a permanent installation in your house or operation that is unsupervised additional safety measures should be added, like you said. This video was to demonstrate the basics of wiring of a BMS according to the manufactures wiring diagram and to demonstrate it functioning. To address the charging of the LFP battery for a few seconds in the demonstration, we don't stock or sell any lead acid batteries at Greentec. Also if you try to charge in LiFePo4 mode it will stop you because it wants balance wires connected for exactly the reason you pointed out but again the focus of this video wasn't to show how to use iChargers. You can use NMC batteries as a UPS buffer though. Thats what every mobile laptop power-bank is, Tesla power wall, etc. They aren't using LFP. The DC power supply needs to be set at a lower voltage than the BMS maximum that way it will never fully charge it to 100% and the BMS should never need to open circuit. Again I only charged it to 100% to demonstrate that it will open circuit and how you then go in and clear the warning to turn on charge and discharge again. Also the iCharger has paralleled fuses built into it as well. Thank you so much for your input, that would be great content for another hour long video.
Great Videos and you speak English. How would you use these to go to like a 47s (150V) LiFePO4 system? Does JBD have anything that will work with that high of a voltage?
Omg that’s so true. I fried out my first icharger using a weak power supply. Now I built a portable case for it with a 7s RC LiPo battery with a JK BMS as the buffer built into the case and it works like a dream! Kind of like a smaller portable version of this. However I’ve been looking for a larger solution like this for when we go to drone races. Those batteries are exactly what I need and they look cool. Does the JBD BMS have a good android app?
Yes we will be posting a video soon about how to program the JBD BMS app. The best version of the android app can be found here. bit.ly/3e1g6GT
Isn’t that different than how you wire the 7-21s 100a Jaibaida? I think I had to combine the middle balance wires.
Yes, the 7-21s JBD boards have a different wiring diagram. The B21 and B20 are connected to the cell while B19 and below can be combined to match your battery. This 7-14s JBD combines the positive most wires together, which is a bit less confusing so always refer to the wiring diagram.
I'm interested in building the 14s 48v battery you have there. I already have lots of lion batteries. where can I get the kit for the physical build?
The 7s eMatrix batteries are from Greentec Auto:
www.greentecauto.com/hybrid-battery/repurposed-batteries/energy/252-18650s
The JBD BMS is from AliExpress found here:
s.click.aliexpress.com/e/_mM4eamG
Those battery modules come as a complete unit with the cells. We don't make them and neither does the manufacturer so no one else sells them and no one sells just the case without the cells but the price is incredibly cheap, less than a dollar per cell. If you buy cell holders and nickel strip and make your own 7-14s battery pack you can still use these instructions to wire up the BMS.
The 7s eMatrix batteries are from Greentec Auto:
www.greentecauto.com/hybrid-battery/repurposed-batteries/energy/252-18650s
The JBD BMS is from AliExpress found here:
s.click.aliexpress.com/e/_mM4eamG
The eMatrix modules are no longer made by the manufacturer and no one else sells them nor does anyone sell only the case without the cells. However GreentecAuto.com sells them incredibly cheap, less than a dollar per cell. Once you factor in the cost of cell spacers, nickel strip and labor it is probably cheaper than making your own pack with your own cells.
Thats awesome. Its a great battery. By the time you factor in cell spacers, nickel strip, labor and time these are an incredible deal. We don't sell the housing separately but you can buy the whole module with the case and the cells here.
www.greentecauto.com/hybrid-battery/repurposed-batteries/energy/252-18650s
Uh. Looks like a fire hazard. That's a lot of little bombs that you are mistreating.
* Please don't use lead-acid settings to charge a LiFePO4 battery. The BMS is there as a fail-safe, don't depend on it for normal operation. Use proper settings. A 4S LiFePO4 battery is typically charged to 3.55V/cell (14.2V) held there for a while to give the BMS time to balance the cells, then dropped to a float of 3.35V-3.375V/cell (13.4V to 13.5V). The float setting is mandatory to keep the battery healthy.
* Do not depend on the BMS to prevent over-charging the lithium pack. BMSs aren't not meant to be used for that function.
* You cannot safely use a power supply to recharge a lithium pack, BMS or not. You need to use a proper charge controller and float setting, otherwise you are permanently stressing the lithium-ion pack. You also can't safely hold the pack at its fully charged voltage indefinitely.
* Lithium-ion batteries are NOT suitable for UPS applications. LiFePO4 yes, NMC/NCA no.
* Do not wire the output of a DC power supply directly to a battery for load-support (don't wire it for charging at all. DC power supplies can only be used for low-battery load-support). That isn't safe. The output of the DC power supply has to go through a bank of schottky diodes.
An example of a suitable schottky diode is a 20SQ060, which can dissipate 4A in free air. So have a bank of however many you need for the amperage you want to supply from the power supply. Stripe side points towards the battery.
* Your system appears to be missing required fusing in several places. Do not depend on the BMS alone as your sole overcurrent protection device. BMSs aren't meant to be used that way.
-Matt
You're absolutely correct for long term use. If you were going to do a permanent installation in your house or operation that is unsupervised additional safety measures should be added, like you said. This video was to demonstrate the basics of wiring of a BMS according to the manufactures wiring diagram and to demonstrate it functioning. To address the charging of the LFP battery for a few seconds in the demonstration, we don't stock or sell any lead acid batteries at Greentec. Also if you try to charge in LiFePo4 mode it will stop you because it wants balance wires connected for exactly the reason you pointed out but again the focus of this video wasn't to show how to use iChargers.
You can use NMC batteries as a UPS buffer though. Thats what every mobile laptop power-bank is, Tesla power wall, etc. They aren't using LFP. The DC power supply needs to be set at a lower voltage than the BMS maximum that way it will never fully charge it to 100% and the BMS should never need to open circuit. Again I only charged it to 100% to demonstrate that it will open circuit and how you then go in and clear the warning to turn on charge and discharge again. Also the iCharger has paralleled fuses built into it as well. Thank you so much for your input, that would be great content for another hour long video.