Bicycle Battery Build: 500W 48V - High-Current 20A Cells or Panasonic NCR18650B 3400mAh?

Hello

I'm starting to build a 500W 48V bicycle battery. Do the cells have to be high-current about 20A? can such batteries be inserted?

PANASONIC NCR18650B 3400 mAh BATTERY

Calculate what capacity you are designing the battery and what will be the discharge current for a single cell and you will answer the question that now cannot be answered.

If they are to be high-current, I recommend the Samsung INR18650-25R (20A continuous discharge current).
However, you have to count, as a colleague wrote above.

It will not be a bicycle according to the regulations

Jarek2140 wrote:

PANASONIC NCR18650B 3400 mAh

This one is not the best for this purpose.
Maximum continuous discharge current: 4.87A, and instantaneous 10A. He will take more temporarily. The continuous current for the battery must be 10-15A minimum. If you want it to be good and durable, but since you are buying new cells, it is probably not worth saving a few zlotys here. Because the battery will not be cheap anyway. An overloaded battery will lose its life significantly.

Added after 4 [minutes]:

Zbigniew 400 wrote:

It will not be a bicycle according to the regulations

Truth. I think myself about adding an auxiliary drive to my bicycle in the fall, because this is how I commute to work and the wind weather discourages me greatly.
Apparently these 250W should be enough, because a cyclist in continuous mode will not do more, but I am afraid that he may muddy a little. I have no experience with electricians, unfortunately, and I wonder myself whether I should give 500W and it will be "saved" at most.

It's not just high-current cells.
To determine what you need to convert the discharge current to a single cell in the package.
The greater the capacity of the package, the lower the unit consumption will be because the total will be divided into a greater number of cells.

Recalculate the answer yourself, unless you want to rely on divination and overinvest.

Barton-wlkp wrote:

It's not just high-current cells.
To determine what you need to convert the discharge current to a single cell in the package.
The greater the capacity of the package, the lower the unit consumption will be because the total will be divided into a greater number of cells.

Recalculate the answer yourself, unless you want to rely on divination and overinvest.

That's right, I ran in and forgot that there would be a number of parallel links in the package.
Now the question is, is it better to take a larger capacity or a larger continuous current of the cell?
And how much can this current motor driver give? Because when it can give with 30A, it can either give more cells in parallel, or high-current ones, which do not have to be much more expensive than standard ones, although they will usually have less capacity for the same price.
If the package is selected, so will its durability.

Well, that's a question, if we assume the engine will take about 10A, then if I give high-current 20A and give 1 link x 13pcs = 48V, about 2500mah - yes, it would be enough for me to drive up steep hills, even for 5km, that I would have enough energy ) so that I would not be tempted to use it every now and then, unless it does not start this way, please let me know if I could do that, possibly 2 rows of 13 cells = about 5000mah 48V.

Added after 2 [minutes]:

Jawi_P wrote:

Jarek2140 wrote:

PANASONIC NCR18650B 3400 mAh

This one is not the best for this purpose.
Maximum continuous discharge current: 4.87A, and instantaneous 10A. He will take more temporarily. The continuous current for the battery must be 10-15A minimum. If you want it to be good and durable, but since you are buying new cells, it is probably not worth saving a few zlotys here. Because the battery will not be cheap anyway. An overloaded battery will lose its life significantly.

Added after 4 [minutes]:

Zbigniew 400 wrote:

It will not be a bicycle according to the regulations

Truth. I think myself about adding an auxiliary drive to my bicycle in the fall, because this is how I commute to work and the wind weather discourages me greatly.
Apparently these 250W should be enough, because a cyclist in continuous mode will not do more, but I am afraid that he may muddy a little. I have no experience with electricians, unfortunately, and I wonder myself whether I should give 500W and it will be "saved" at most.

these panassonics have 6500mah discharge current

Specification:
cell model: Panasonic NCR18650B
nominal voltage: 3.6V
typical capacity: 3400mAh
minimum capacity: 3250mAh
maximum charging current: 1625mA
maximum discharge current: 6500mAh
maximum charging voltage: 4.2V
minimum cut-off voltage: 2.5V
dimensions: diameter 18.5mm, height 65.3mm
weight 47.5g

So if I gave, for example, 3 x 13 cells, I would have a real 9000mah / 48V and in my opinion they could also give away at least 15A

It's a bit of a pinch. 5A from a cell is a lot for NCR18650B for a continuous discharge current.
13S3P package minimum.

You write that you want to put links "in a row".
Read about assembling cell packages.

no if 1 cell x 13 = 48V approx
or 2 links in parallel x 13 pieces in a row. = 48V 5000mAh

A package with 3 "rows" of 13 cells is the minimum.

ok i will another question, how to convert the driver? do you unlock there? I would like to give up everything from it, are there different versions of the drivers or buy the first one up to 500W 48v?