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Author Topic: 6S Li Ion 22V (25.2V) Battery Pack with BMS - for 10VDC Voltage reference  (Read 43 times)

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Online Kiriakos GR

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I am about to improvise and make one 22V power pack,  this will serve as Travel pack for my  10V DC reference IC which it is installed at my resistors decade box.

The ingredients are 6x 18650 (I have those).
BMS with passive balancing (Price 3 EUR)
Two of 4x 18650 storage clip box (Price 2 EUR for both).
One Blue LED volt meter, among with one button switch (momentarily contact) so this to connect the voltmeter as check point.
And final addition this will be a DC/DC converter with adjustable voltage and adjustable current among with adjustable Charge Full indicator (Price less than 1.5 EUR if you are careful).

Due this opportunity and because I am waiting for some parts to arrive, for now I will add my thoughts and some pictures of the parts which I selected to use.

Especially about this BMS there is so much misinformation at the Chinese neighborhoods.
And this is no accident, most future buyers of 6S BMS these are kids planning to convert skateboards in to electric transportation gadgets, and as we say in Greece: At the kingdom of blind people the King is the one with a single eye.

In the upcoming days I will post more details about this project.
New visitors of ITTSB Blog they are not aware that when Kiriakos (Me) starts a project, end product this will be a unique product design.

My advice = Place a bookmark and visit us frequently.  ;)
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Online Kiriakos GR

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This is a gift to international visitors of ITTSB Blog.   8)
Original Exclusive BMS HX-6S-A06   electrical specifications’ .
BUT THERE IS MORE ....  :)

Second gift this is Original Exclusive BMS HX-6S-A06 NOTE: From the PCB maker for proper operation.


A)
Description
Protection board for the assembly of six li-ion, li-po batteries in series.
With balancing.
Maximum continuous load current - up to 6.0A.
Maximum impulse load current - up to 8.0A.
The recharge voltage of the overcharge protection is 4.28V ± 0.05V, but in fact the balancing chips stand at 4.20V - so after balancing the voltage on the batteries will be 4.20V.
The return voltage to normal mode is 4.08V ± 0.05V.
The voltage of the protection from the deep discharge - 2.40V ± 0.075V.
Restoration of the operating mode - 3.00V ± 0.075V.
Current balancing - 45mA.
Dimensions - 61 * 41 * 8 mm.
Connection diagram included.
To activate the circuit you need to connect the charger.
The protection circuit is not a charging controller.
The required charger voltage is 25.5V (25.5V).
The charge current depending on the battery is usually 50 --- 100% of the battery capacity.

B)
Note: For the balance of balanced better consistency, try to use 25.6 V switch source to charge (since the power flow is lower than 30 mA).
Because of the equilibrium of the 1C equilibrium current at about 45 ma, and on the market most 25, 2 V li-ion battery charger, charging current is lower than 100 mA will stop, is not balanced, no electric charge came in, the battery voltage imbalance in each group.

As for the problem of voltage drop between the battery voltage and the output voltage, the working principle of this kind of protection plate is negative protection.

When it is just combined, some will have a voltage drop of 0.1 ~ 0.3V. 
Try not to use 25V power supply for the charger.
The full charge of 6 series of lithium batteries is 25.2v, and the 25V power supply will not be fully charged, and the protection plate will not be protected, so it will be charged all the time.
Long-term use will have an impact on battery life, thank you for understanding.

C)  ITTSB BLOG Comments

By truly diving in to HX-6S-A06   circuit details I am now aware that this BMS maker he is more honest that retail sellers them trying to trade this product.

PCB printed code this is very explanatory:
HX = Maker logo,
6S =Battery configuration,
A06 = 6A continues at resistive load (car 24V light bulb).


HX-6S-A06 PCB this using quad AO4406A 30V N-Channel MOSFET SOP8, these are 3.5W Max thermal dissipation its one.
AO4406A FET electrical specifications’ sheet this is very informative.
This deliver 10A when warm (70C) and 13A Max at 25C 

HX-6S-A06 Current handling this is lower when load this is resistive at 6A, another serious limiting factor this is PCB dimensions and cooling surface.
Now constant current handling at pulsing loads this increases to 8A due all four AO4406A FET in use, its one will handle 2A and this a decision for minimizing of stress factor (load sharing).

This translates that a load of 5A this will drive this PCB to 35C that is a thermally accepted value.     
Calculation time:  5A x 22V = 110Watt  
This translates to a single row of 18650, because a double row will not be able to get balanced with 45mA.   

The maker of HX-6S-A06 PCB makes also the assumption of 75A short-circuit Max current.

Personally I am going to test and verify HX-6S-A06 PCB at several operating conditions.
In the positive side of things there is an option for thermal switch at fixed temperature and this is highly important and not an option to me, because this it should be there all ready so to monitor PCB temperature.

Many people attach a BMS over the battery cells and this is most stupid idea EVER …
 
My very own application this is a consumption of 8~20mA and this is not stressful for this BMS PCB.
In a few weeks I will discover the entire truth, but one voice in me this says that I am dealing with BMS this made to handle a 100W LED torch or similar Low Drain devices.
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Online Kiriakos GR

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Transit (11Days) from China and delivery by the postman at my door ... this is a wild dream but it did happen.  ;D

Now I am forced to wait for the special lithium battery holder boxes. 
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Online Kiriakos GR

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Here is few thoughts for the ones thinking to activate temperature protection.
You are going to need a switch thermostat, normally closed contacts.
They are many selections available speaking of temperatures range.
You better consult manufacturer documentation so your choice to really get triggered at your choice of Max temperature.

Another thought that it should puzzle your head, this is what you are thinking to protect?
The switch thermostat is rather slow, this is not for measuring the temperature of a single battery cell.
Such a switch thermostat, this is more an fuse with self recovery action, it might help protecting and air-tight battery pack in which the BMS this is stuffed in it.

My own first thought this is that for my application I do not need such a thermostat.
If I was using this battery with a high drain device then I would worry so the power MosFet to never get very hot, because the heat eventually will be shared at the lithium cells, and entire battery pack it would turn to an oven.
     
Soon I will perform a test, so to discover quantity of heat and temperature dissipation according to Load.
This thing has MosFet in the casing of IC, such things brings to me memories from the era that I was placing miniature heatsink over my VGA card so to overclock the speed of RAM chips.  ;D

Here is a picture of such switch thermostat, less than 1 USD on eBay.       
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