will this bms be reliable and compatible?

Hi how are you doing,
Ihavea need for clarity and advices
Ihave 13s8p sony vtc4cells spec at bottom

i'm looking at a good bang for buck bms. i dont know really know what options can a bms have that are intersting to have.
i want a 60amp continus (in reality i will not always use 60amp but it is good to have de possibility and if possible as water proff as possible.
i plan to charge with a 5A 48v(54.6V) charger

is the following item compatible with may cells and battery? i ask it because a saw a very similar bms on which was stated nicd... :?

https://www.aliexpress.com/item/13S-60A-48V-Lithium-Battery-Protection-Board-BMS-Waterproof-18650-Lipo-Li-ion-cell-for-electric/32876215563.html?spm=2114.search0604.3.45.3c7e720flXF8Yl&ws_ab_test=searchweb0_0,searchweb201602_1_10152_10151_10065_10344_10068_10130_10342_10547_10343_5722611_10340_10548_10341_10696_5722911_5722811_10084_5722711_10083_10618_10139_10307_10059_306_100031_10103_10624_10623_10622_10621_10620_5722511,searchweb201603_12,ppcSwitch_5&algo_expid=9bac780b-e060-4a17-bfd3-2d122e1f250a-6&algo_pvid=9bac780b-e060-4a17-bfd3-2d122e1f250a&transAbTest=ae803_2&priceBeautifyAB=0

As you see, they give the choice of 60A common port Version : common port for charge/discharge60A VS separate port Version : separate port for charge/discharge. what sould i choose that is the difference , effects and consideration?

thx


vtc4 Specifications:
Rated capacity: 2100mAh (high drain)
Minimum capacity: 2000mAh
Initial discharging current: 15A
Maximum continuous charging current: 6.5A
Maximum continuous discharging current: 30A
Voltage: 3.8V
Nominal operating voltage: 3.2V
Maximum charge voltage: 4.2V
Discharge cut-off voltage: 2.5V
Dimensions: 65.0mm (L) x 18.2mm (D)
Note: Sony VTC4 IMR cells have a much lower internal resistance than regular 3.7V lithium ions. Voltage could go higher when charged on certain chargers such as the older versions of the WF-139 charger. Always check the voltage of your 18650 IMR battery after a full charge to make sure it is above 4.2V. You can use a multimeter to do this. Overcharging your Sony VTC4 above 4.25V may shorten the life cycle or even cause permanent damage to the product.

That BMS seems like it should work fine for those cells. Charging to a slightly lower voltage like 4.1v/cell will extend the lifetime of the pack but sacrifice some range. This is done by adjusting the charger voltage. The BMS should work either way.

hi would you know how to choose /explain the consequences of

the choice of 60A common port Version : common port for charge/discharge60A VS separate port Version : separate port for charge/discharge. what sould i choose that is the difference , effects and consideration?

I always prefer the separate port style. It will generate less heat at high loads.

sorry for my ignorance,

what are those port?
why is there a divisin of the amperage? isn't the amp supposed to all go in the controller?

With a single port, there is just one pair of wires coming out of the BMS for both charging and discharging.
A two port has a separate pair of wires for charging and discharging.

The charge and discharge current ratings for the BMS are determined by the parts used (mainly the MOSFETs). To get a higher rating takes more of them or more expensive ones.

With a single port, when discharging (running the motor) all the current has to pass through two sets of MOSFETs before it can get to the motor controller. Each set generates heat, so by using a two port, you can eliminate the need to pass the current through one set. Same happens during charge, but the charge current will be much less and heating is not an issue. Also since the charge control MOSFETs have to pass the full discharge current, you need more of them, so the board will need to be physically larger.

Most of the time, the BMS isn't doing anything and just passes the current from the battery to the controller. Only when cell voltages exceed the set point does the BMS trip and turn something off to protect the cells. The charger and motor controller should have their own limits so the BMS doesn't normally ever trip.

fechter said:

Also since the charge control MOSFETs have to pass the full discharge current, you need more of them, so the board will need to be physically larger.

Most of the time, the BMS isn't doing anything and just passes the current from the battery to the controller. Only when cell voltages exceed the set point does the BMS trip and turn something off to protect the cells. The charger and motor controller should have their own limits so the BMS doesn't normally ever trip.

Click to expand...

hi
for first sentence, are you saying the bms is too small and i need a larger one?
for the second sentence, what is the info your are trying to convey to me?

on descrption it says common port version charge current is 60A and separate port version charge current is 8A
Does this mean that common port can charge and discharge at 60 amp and that the separate port version can dicharge at 60A but only can charge at 8 amp?
https://www.aliexpress.com/item/Deligreen-14S-60A-48V-PCM-PCB-BMS-for-lithium-battery-pack-18650-Li-Po-LiNCM-Battery/32851240283.html?spm=2114.search0604.3.8.7a014258M6eTP6&ws_ab_test=searchweb0_0,searchweb201602_1_10152_10151_10065_10344_10068_10130_10342_10547_10343_10340_5722611_10548_10341_10696_5722911_5722811_10084_5722711_10083_10618_10139_10307_10059_306_100031_10103_524_10624_10623_10622_10621_10620_5722511,searchweb201603_43,ppcSwitch_5&algo_expid=a10e61c6-cda5-4070-a03c-12a8968dc7d2-1&algo_pvid=a10e61c6-cda5-4070-a03c-12a8968dc7d2&transAbTest=ae803_2&priceBeautifyAB=0

im confused.hahaha

Yes 60amp discharge it may be 60amp max and 40amp continuous you must read the fine print and 8amp charge. Yes your high quality cells can be charged at higher rate but not through the BMS. Yes you need a bms. You should balance your pack before hooking up the BMS BMS will help keep your pack in balance is not really made to balance some wacked-out pack. You have a spot welder and the paper circles for the positive end before assembly.
http://a.co/71lUJKl
Here is a cheap book with pictures.

I understand that by choosing a separate port there will be less heat issue .

the negatif part to choosing a separate port is that the charging limit is only 8 amps.... opposed to 60amps

Is it really bad to have a charging maximal limit of 8 amp? doyou guy ever charge higher than that?

in what circumbstance could a higher charging amperage be worth use?

I would never charge at over 8A with any of my packs. If you had a huge car-sized pack, then you would want a higher rating. Charging at a lower current is safer and better for the cells but just takes longer.

If you have regenerative braking, you might see higher charge currents but that would be going through the discharge port so could handle the current.

How many amps do you think you can charge at ? Are you going to use 220v charger ?

hi thanks for yu answers

999zip999 said:

How many amps do you think you can charge at ? Are you going to use 220v charger ?

Click to expand...

hi
i have yet to choose a charger for 14s... i would plug it in regular usa electric wall pluc so i think it is name 110v if im not mistaken

Can every bms be programmed to stop charging when reaching 4.1v?
if not do you kno a companie _seller that sell some ?
because i would maybe buy the good bang for buck from 4a 58.8v form ypower on aliexpress, is has got different choices.

https://www.aliexpress.com/store/product/Intelligent-58-8V-4A-Lithium-Battery-Charger-for-Electric-Tool-Robot-Electric-Car-Li-on-Battery/2217102_32814642478.html?spm=2114.12010612.8148356.7.1fe72aae2SJlyM