Making a small pack 5S24P

Batteries, Chargers, and Battery Management Systems.
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leffex   100 W

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Making a small pack 5S24P

Post by leffex » Jul 03 2019 1:59pm

Just some photos of my small pack I want to share

How to assemble: Soldering
exactly how: tesla style. One side is fused with wire capable of 5-15a max(deciding), the other more robust fastened with thicker copper wire. Both sides uses twined copper wire as busbar. Hot glue gun to make pack sturdier and also additional plastic and soft material inbetwen + manually activated fan cooling.
Size: 18,5x30x7,5 cm
Numbers of cells 5s24p
Cell type: Used tested Panasonic 18650PF
Usage: max 150A, 6,25 per cell
Total wh: 1221 (18,5Vx66AH)

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leffex   100 W

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Re: Making a small pack 5S24P

Post by leffex » Aug 24 2019 9:59am

Work table:
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1 of 5 pieces
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5 pieces fits inside one
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Finished pack:
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Module pack stats:
18,5cm*7,5cm*30cm = 4162cm^3 Volume = 4,162 L
5s*24p 2,9PF nominal 1221wh
1221wh / 4,162 L = 293wh/L

Next mission, what to do. Test pack for voltage drop at set load and monitor temperature
emotorcycle 22kw. Salestech in an ebike store

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flippy   100 kW

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Re: Making a small pack 5S24P

Post by flippy » Aug 27 2019 5:42am

what cell holders did you use?
Lithium beats liquid dinosaurs.

leffex   100 W

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Re: Making a small pack 5S24P

Post by leffex » Aug 27 2019 12:54pm

Something like cylindrical or 6squared plastic cell holders. The ones I used was 1x4p so I added them together and broke some to make smaller pieces were needed

These are very alike but not the ones I have
https://vruzend.com/product/hexagonal-1 ... rs-3-cell/

I first thought not of using any but then its pretty much better in all ways to use plastic cell holders than not to
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leffex   100 W

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Re: Making a small pack 5S24P

Post by leffex » Sep 14 2019 1:34pm

Another pack mocked up for photos:

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Module 2 pack stats:
18,5cm*7,5cm*30cm = 4162cm^3 Volume = 4,162 L
5s*26p 26F nominal 1196wh
1196wh / 4,162 L = 287wh/L

Power rating 26p x 5,2a = 135,2A

I'm thinking about what these modules can give in relation to power. I don't want the cells to get warm and they are only 26p for a normal usage of 1,7kw/h or 65w / km. That means the power from the full battery will be average 1700w used per hour and 1/4th of the energy will come from module 2 consisting of 1196wh module which is 1196/4 = 299wh. That makes out to average load of 1700w/90v = 19a shared load for 26 parallel cells. hmmm it will work. easy :D
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flippy   100 kW

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Re: Making a small pack 5S24P

Post by flippy » Sep 14 2019 4:08pm

i found the cell holders on ali: https://www.aliexpress.com/item/32919687859.html

i have orderd a set and see if they can take self-destructing cells without catching fire or melt too bad that it can lead to a catastrofic ending for a battery. that is going to be a fun -but smelly- afternoon.
Lithium beats liquid dinosaurs.

cwah   10 GW

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Re: Making a small pack 5S24P

Post by cwah » Sep 15 2019 1:29pm

How do you find the right size box?
Help me find my stolen electric brompton: http://bit.ly/1a0vbBC and Bosch Sinus B3 http://bit.ly/1eV0WQz

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