Hi! Welcome to product tutorial from Robojax. My name is Ahmad Shamshiri. I
am presenting this tutorial from Canada. in this tutorial I am going to show you
how these lithium batteries cell balancer work and to show you the schematic of this how this
functions. I'm going to connect it to the battery and also I'm going to measure I'm
going to practically show you how this does the balancing on this battery and also this
can be used for these type of batteries as well let's get started with this. rental to
start draining and help this is as if we have a switch on to the a and after that we have
this year battery and also the batteries itself this connector will be negative of cell 2 will
be connected to the power voltage as here and the current is here let's get started
for all these lithium-ion or lithium polymer batteries you need to keep them balanced and to
keep them healthy and to give them longer life you need to balance them majority of the chargers that
you buy for these lithium batteries they have cell balancer this portion is for balancing the cells
this is for three cell and we have three balancer here one two and then three a separate video
explaining this three cell charger and balancer the link for that video is below this video in
the description but these are also sold separately - for the purpose of GF balancing for example this
is for is for cell balancer as you can see here be played before and this is for three because we
have three balancer here and then we have as you can see more there is five this portion is empty
so we have five balancers sex balancer and also eight balance it is cell balancer you might see
them something like this in red color but these are exactly the same chip but they put different
value of resistors to balance at a different rate to explain this balancer we have a balancing chip
we have a MOSFET or a transistor switch and we have a reverse search this balancer will check
the voltage of the battery continuously and if it is above certain value depending on the type
of the battery it will connect this resistor but at the two terminal of the battery and will drain
the battery here and dissipate the power as heat so the battery will slowly the voltage of the
battery will slowly be decreased this is one of the famous cell balance of chip the one that I'm
using is BB 3a and this version is written on the chip it actually this is a variation of this hy 2
2 & 3 and as you can see here there's different version if you get the a B 3 B that would be for
this type of battery which four-point-two but that the release voltage is different and here you can
get also 4.18 depending on the different chemistry of the battery you will put the friend model but
for all these batteries that you buy we will be using BB 3a which is which works with 4.2 volts
so what it does is that the cell balancing will start at 4.2 volts and there is some 25 millivolts
variation class - up and down but as 4.2 volts it will start activating the balancer and when
the voltage drops again it will stop it at 4.19 and here is a schematic for each Y - 2 1-3 this
discipline is connected to the battery so this is the battery the battery is connected to this
terminal the positive is on this side for each battery we have the same circuitry and this pen
weapon to wear this resistor it is connected to the battery it measures the voltage in this very
little energy like micro ampere to measure the voltage and when the voltage goes above
4.2 volts then it will way up and success will turn on this MOSFET which is connected via this
resistor between the positive and the negative of this when this is switched on these two terminals
will be connected and this resistor is connected on one positive of the battery and the other side
of resistor will be connected to the negative and the current will start draining and help
this is as if we have a switch and the resistor across this battery and when you turn the switch
on it will connect this with a certain the two terminal and the current will start flowing so
the amount of current depends on this resistor that which will turn on when the battery region
has 4.2 volts so you can see this is a 62 ohm this x2 and then 0 means no value if there
is one it will be 1 0 so now this is 6e 2 ohm resistor and here on this one we have 100 ohms
this is 1 zero-one death 1 min 1 0 so there is a value 100 ohm and here on this module we have 43
ohm as I said for this 4 cell so we can calculate amount of current for point two divided by 62 ohm
resistor and as you can see it says 67.7 milli ampere or 0.067 ampere the main component is
BB 3a and after that we have this a 2 s HB this is a MOSFET and then we have the resistor which
you see it large hair on the side and hence the data sheet for the a 2 SB h the actual model is
this one but on device marketing is as a 2 s HB and this is a mofette that can handle up to 3
point 7 ampere the resistance of the resources 50 milli ohm when it is turned on that is this MOSFET
unheard of a battery charger on that where you can connect your battery and also you
can connect all the connectors with just GST XH connectors for example here you can connect the
two cell which has three wires and three cell which has forward four and more cells and on
this one when you select the type of battery let's say lithium-ion you can see that it has
balanced feature once you press a balance then it will tell you the balance current at what current
you want to balance it because it will create that current and here it will tell you how many
cells you have for example three cell you can go for four cell and once you start it will balance
your battery and this imax b6 is also another charger which you can connect it to AC anywhere
in the world and it can balance the different type of batteries including lithium phosphate
lithium polymer lithium ion nickel cadmium any type of battery that you want it can do the
charge discharge and balancing and here has some lithium polymer batteries this is bad now but I'm
going to show you using this battery tester this can be this can be also purchased from
eBay and AliExpress or Amazon I have a video explaining this you can check the battery the
lithium batteries with this and if I insert it shows the total voltage and then in each cell it
shows that all is 11 and cell number one three point six cell number two three point six and
three point seven and all so it continuously shows you each cell and it if the battery is
itself this connector will be long it can measure up to eight cells and here if I check the other
battery you will see that it shows all 11 volts so first cell is low two point eight four point one
it is a 3-cell 2200 million per hour all 11.9 the
first one is 3.9 3.9 5 4 and this is a brand-new never used battery
and 1.2 3.6 mine as you can see 7 6 9 service oh this is fully balanced
you can use these pieces separately only once the battery is fully charged so you can use it
to balance it as the battery voltage is below the threshold of these balancer it will it will
do nothing if you connect this right now to this module nothing will happen because the
voltage is below 4.2 volts and hair how to prepare this it for full cell as you
can see this is all filled up and this is for 3 cells the last portion is empty and here we
will connect the first cell the negative half the positive hair and then the second cell the
negative will be here and depositors at this point and the tercel the negative will be here
and a positive will be in that cell so I've soldered all these wires which will be saw
that to the batteries and these terminals here and here and here is how you prepare
your battery before connecting your balancer the negative force first cell is battery zero
or zero volts and the positive a 3.7 volts or b1 and then you connect another battery
the negative of cell 2 will be connected to the positive of cell 1 and the positive is to
the point of b2 and it is 7 point 4 volts and then the third cell will be connected
from the negative to the positive if you pay attention that all negative to positive so
there in series to add up the voltage source of 3 the negative is at this point and the positive
is battery 3 or battery plus + 3 11 point 1 volt now to connect it with a cell balancer
you will connect from the positive to be one and it will balance only one cell but if you
have second cell continue from the second point from b2 also connected here to be 2 and if you
have the third cell connect a positive of the last cell to b3 and this way it will balance them all
and here for the methylation I'm using my power supply as a battery and currently let's assume the
battery voltage is 4 volts and the positive terminal is connected here the negative is
connected here now I'm just balancing one cell and here I've put also my emitter in series to
the one cell so we can see the current here the voltage is here and the current is here and now
I'm increasing the voltage slowly you will see the voltage as it reaches around 4.2 plus minus
25 millivolts this will the current will pass and on this module the this MOSFET will turn on and
connect this 62 ohm resistor across the battery which has now this voltage and when you turn
the switch on it will connect this resistor and the two terminal and a calendar start flowing so
I'm increasing the voltage pay attention here as you can see 4.1 volt there is no current 4.11 as
you can see 4.17 also 4.2 and slowly is showing up 4.2 - as soon as it goes like 10 millivolts
more now it's 4.23 and you can see that we have 66 milliampere across the battery so this way now it
does 66 milli ampere will take a while to reduce that level of them the voltage from the battery
so increasing the voltage pay attention here as you can see 4.1 volt there is no current 4.11
as you can see 4.17 also
four-point-two absolutely it's showing-up 4.22 as soon as it goes like ten millivolts more now
it's four point two three and you can see that we have 66 milliampere across the battery so this way
now it does 66 milli ampere will take a while to reduce that level of them the voltage from
the battery but keep in mind that when this is connected you cannot have also a charger
connected you cannot have power across this connected when the balancer is connected so
when you connect the balance the power should be turned off that is why that's why these charges
they shut off because we have a balance controller and also we have battery protection this battery
protection was turn off the external power and this will kick in to balance it if I increase
the voltage which in real life you will see that in real life you will not be able to go
to this high because the battery protection is preventing it but the current will increase and
that was 66 milli volt milli ampere and then if I reduce the voltage slowly it will turn
off as you can see even at this voltage when the voltage goes back to normal this will turn
off here now I'm connecting this battery which is already balanced the voltage is very low to
just demonstrate that there is no current passing through this and I've connected it
the voltage is three point nine volts nine four and the current is at the moment zero
I would like to thank my patrons from Patreon.com
Subtitle typed/corrected on November 03, 2020 by Ahmad Shamshiri in , Canada
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if you want to get updates of my upcoming videos you may subscribe now. Hi! welcome to product
review by Robojax. my name is Ahmad Shamshiri. I am presenting this tutorial from Canada. in this
tutorial we are going to do the review and see how we can use this 0 3 9 6 to a LiPo battery or
battery charger module of rated of 1 ampere we're going to explain the module all the components and
showing you the schematic diagram for 0 5 SEC's chip the pen VCC is connected then I'm going to
show you how to wire it and also charge the battery here or USB and these are I'm going
to show you the amount of current that it can provide and charge the battery with an empty
battery current at the moment to the battery in this video we are going to see how we can use
this 3 cell labeled as faulty impaired lithium battery charger these are all exactly the same
with different shapes and different manufacturer we're going to connect it to 318 650 lithium
batteries so I'm going to explain the module all the inputs and outputs then I'm going to
look at each component and try to bring up the datasheet after that I'm going to explain how to
prepare the batteries and connect them together then I'm going to solder the BMS to the battery
after that I'm going to measure the voltages across each cell going to charge it what type
of source you need so I've set the current to 2 ampere here then we're going to apply charge to
the batteries at different currents and check it after that I'm going to try to connect a load and
discharge the battery and see how it behaves I will also test the over current protection
over voltage protection and under voltage protection as well and then we are going to
do the short-circuit protection by connecting the output of the battery short-circuited this
is a very short video which will just show you how to connect the battery and start charging it and
using it if you need full detail and explanation how it works and all the components and different
tests I have a longer video the link for that video is below this video in the description