DIY Battery Help

Batteries, Chargers, and Battery Management Systems.
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xmuf   1 mW

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DIY Battery Help

Post by xmuf » Apr 26 2021 2:06am

Im building an electric skateboard and want to try my hand at building a battery using these holders.
I would prefer the battery to be in a single layer and can't find any tutorials online for that configuration in 10s2p
Any suggestions or help is appreciated
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TrotterBob   1 W

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Re: DIY Battery Help

Post by TrotterBob » Apr 26 2021 3:43am

I'm no expert but I wouldnt trust those spring connectors to handle the current or to stay in contact while you're riding. If youre not into spot welding you might want to check out the Vruzend battery kit.

Soldering 18650s is also a bad idea as it transfers too much heat into the cells. You probably knew that already.

Heres another no spot weld battery kit:

https://hackaday.com/2018/07/03/an-e-bi ... t-welding/

Not sure if they offer a 10s2p pack.

xmuf   1 mW

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Re: DIY Battery Help

Post by xmuf » Apr 26 2021 7:35am

Thanks man, yeah I've seen those kits though none of them have a slim design like the image below. id be down to try spot welding as there's a $40 spot welder that's had good reviews on youtube so I'd be up for that. Although there's no tutorials for the flat configuration Im after so would need some advice on that
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flippy   100 MW

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Re: DIY Battery Help

Post by flippy » Apr 26 2021 8:30am

the configuration does not matter. you need to understand the principles of sport welding and series/parralel connections.

also: you need to allow serious movement between the battery and the board. boards can flex and be fine, batteries do not like to bend, like...at all....
The bitterness of low quality remains long after the sweetness of low price is forgotten

xmuf   1 mW

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Re: DIY Battery Help

Post by xmuf » Apr 26 2021 5:21pm

where can I learn

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flippy   100 MW

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Re: DIY Battery Help

Post by flippy » Apr 26 2021 5:22pm

xmuf wrote:
Apr 26 2021 5:21pm
where can I learn
start by looking around this forum in the battery technology section and start reading and searching for keywords for a couple days. trust me, you are not the first person wanting to make your own battery. :wink:
The bitterness of low quality remains long after the sweetness of low price is forgotten

TrotterBob   1 W

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Re: DIY Battery Help

Post by TrotterBob » Apr 26 2021 8:19pm

There are a few good youtube videos on how to make eskateboard packs flexible. Basically they solder some copper wire to nickel strip tabs then spot weld the assemblies to the cells. 2p just means you'll have 2 cells next to each other.

I would also look around the E-skateboard specific forums. They should have some good build guides.

xmuf   1 mW

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Re: DIY Battery Help

Post by xmuf » Apr 27 2021 3:11am

18650 samsung q30 cells
The end is welded when they are stood up right then folded flat
would .15 nickel be thick enough?
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TrotterBob   1 W

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Re: DIY Battery Help

Post by TrotterBob » Apr 27 2021 8:24am

If your nickel strips dont handle enough current in certain places you can always double them up. No need to shop for thicker or wider.

https://www.youtube.com/watch?v=wdZ_Ca_sAZE


xmuf   1 mW

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Electric longboard BMS/Balance charger

Post by xmuf » Apr 30 2021 6:35pm

Im building an electric longboard and in the process of purchasing the parts. Ive heard somewhere that the bms eliminates the need for a balance charger? I'm unsure and don't won't to buy any unnecessary parts, what would be the simplest way to charge/run

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flippy   100 MW

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Re: DIY Battery Help

Post by flippy » May 01 2021 4:22am

yes, a bms with balance feature means you dont need a special charger.
The bitterness of low quality remains long after the sweetness of low price is forgotten

eMark   1 kW

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Re: DIY Battery Help

Post by eMark » May 01 2021 11:55am

Start considering the advantages of going this route instead of DIY. Here's one possibility ...

Image

https://www.alibaba.com/product-detail/ ... 19cavfNk56

Your main challenge is to provide attachment/enclosure as shock proof and weather resistant as possible to protect battery. Being you have no previous spot-welding experience buy a pack already assembled like the above. Going this route will save you the time and any frustration of a 1st time DIY battery build. ENJOY the ride :thumb:

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agniusm   100 MW

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Re: DIY Battery Help

Post by agniusm » Jun 05 2021 1:41pm


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