smallexis Posted June 4, 2017 Share Posted June 4, 2017 Here is the last battery I have just composed, in order to add 190Wh to a 9B1, without visual impact from the outside : It is no longer a surprise to see that there is ample room for cell storage, but not only that, because an ultra compact BMS can also find its place And finally, looking for a bit, I found a BMS 15S (so no need to tweak from a 16S) which size is perfect to go into the compartment Here again, the challenge is not so much to set up the cells in series, but to find how and where to pass all the balancing wires And so the idea is to have them cross the motherboard compartment, just below it, to join the BMS on the other side. Concretely, here is what it gives from the inside. There is still some wiring to connect but the hardest is done. The wires that pass through the motherboard compartment are glued to the silicone, forming a protective envelope. Of course this does not interfere in any way the installation of the motherboard nor its smooth operation because nothing touches. It takes a small cut on each side (right and left) to allow the bumper to regain its place. In the end there are just the charging wires which will pass in addition by the top of the bumper to connect the battery on the other side. The inside face is completely waterproof (with silicone), the half shell took a small kilogram more with this battery upgrade. Link to comment Share on other sites More sharing options...
SuperSport Posted June 5, 2017 Share Posted June 5, 2017 That's pretty ingenious to fill with Silicone. I would not have thought of that. Good Job! Link to comment Share on other sites More sharing options...
RooEUC Posted June 5, 2017 Share Posted June 5, 2017 Excellent job! But a very permanent irreversible mod. If anything fails with the wiring or a cell goes bad will you just throw away the whole shell with the batteries buried inside? Link to comment Share on other sites More sharing options...
smallexis Posted June 5, 2017 Author Share Posted June 5, 2017 9 hours ago, SuperSport said: That's pretty ingenious to fill with Silicone. I would not have thought of that. Good Job! Thank you. I put not only silicone because I cut small plastic parts to have some coverage to close all the compartments And I finish the sealing with a last layer of silicone. Water is not welcome so you must strongly seal each compartment. Link to comment Share on other sites More sharing options...
smallexis Posted June 5, 2017 Author Share Posted June 5, 2017 8 hours ago, RooMiniPro said: Excellent job! But a very permanent irreversible mod. If anything fails with the wiring or a cell goes bad will you just throw away the whole shell with the batteries buried inside? Yes no other choice than make it permanent in this upgrade. But the BMS compartment is not full glued and it's not very difficult to remove the plastic cover. In the case of a problem, it's possible to make measurement to the wires arriving at BMS to detect which cell(s) is (are) damaged. So you can located the compartiment you have to open even if this step is not easy but not impossible. I have made my first upgrade in both shells (I have had 375Wh, please follow the link look at my solution to add a 375Wh battery inside my 9B1E shell in order to have a total capacity of 750Wh) a year ago and everything is working well until this day after more than 1000 km traveled. Link to comment Share on other sites More sharing options...
Hunka Hunka Burning Love Posted June 9, 2017 Share Posted June 9, 2017 @smallexis you are a sheer genius. Plain and simple. Where did you get the 15S BMS? Got a link? Link to comment Share on other sites More sharing options...
Rehab1 Posted June 9, 2017 Share Posted June 9, 2017 @smallexis Awesome mods!! Please post more photos when you finish! Link to comment Share on other sites More sharing options...
smallexis Posted June 10, 2017 Author Share Posted June 10, 2017 7 hours ago, Rehab1 said: @smallexis Awesome mods!! Please post more photos when you finish! thank you but I have no more picture and I can't take anymore because this shell is use by my friend @cbgti for 2 weeks. Link to comment Share on other sites More sharing options...
Rehab1 Posted June 10, 2017 Share Posted June 10, 2017 @smallexis The more I study your superb modifications the more intrigue I become. Your conceptual, analytical and technical skills should be applauded! Idea: An great topic titled 'Really Interesting Interview' posted by @codersarepeople, the owner of Grin Technologies encapsulates his cells in fiberglass to form custom packs. My thoughts are if you fabricated custom packs for the NB1 you could then sparingly silicone or even use double faced tape to secure the packs inside the shell for ease of removal in the event a cell does go bad. Just a thought. Link to comment Share on other sites More sharing options...
SuperSport Posted June 10, 2017 Share Posted June 10, 2017 I'd love to have this done on my MSuper 820Wh. Turn it into as large as possible Wh in my stock shells. There's quite a bit of space available. Link to comment Share on other sites More sharing options...
smallexis Posted June 10, 2017 Author Share Posted June 10, 2017 22 hours ago, Hunka Hunka Burning Love said: @smallexis you are a sheer genius. Plain and simple. Where did you get the 15S BMS? Got a link? thx, you can find this BMS on aliexpress : https://fr.aliexpress.com/item/15S-25A-48V-lipo-lithium-Polymer-BMS-PCM-PCB-battery-protection-board-for-15-Packs-18650/32780544801.html?spm=2114.13010608.0.0.2QjPUa Link to comment Share on other sites More sharing options...
smallexis Posted June 10, 2017 Author Share Posted June 10, 2017 9 hours ago, Rehab1 said: @smallexis The more I study your superb modifications the more intrigue I become. Your conceptual, analytical and technical skills should be applauded! 9 hours ago, Rehab1 said: My thoughts are if you fabricated custom packs for the NB1 you could then sparingly silicone or even use double faced tape to secure the packs inside the shell for ease of removal in the event a cell does go bad. Nice link and it's very interesting for a future project Many thanks. Maybe it's not perfect but it's works very well and it was my goal. Link to comment Share on other sites More sharing options...
alex87 Posted July 14, 2017 Share Posted July 14, 2017 hi nice work, could you see my thread? Link to comment Share on other sites More sharing options...
alex87 Posted July 14, 2017 Share Posted July 14, 2017 i also have a doubt about the using of the 15s balancer..... do you only use the balancer to charge the full pack, or you continue to use a xt60/xt90 connector with 63v ? i don't understand if you have to connect BOTH cables... the 63v one ( at the 2 sides of the circuit) , PLUS the 16 balancing cables... because i've also seen someone who charge lipo packs only with the balancing connector Link to comment Share on other sites More sharing options...
smallexis Posted July 14, 2017 Author Share Posted July 14, 2017 2 hours ago, alex87 said: hi nice work, could you see my thread? thank you there is a big difference between 9B1 16" and 9B1 14" concerning the battery and especially the BMS. Now, for 9B1 14" and Segway Mini (or NINEBOT MINI PRO or MINI XIAOMI), inside the battery's BMS there is an electronic component that allow the motherboard to recognize the battery. If you make your own DIY battery with a standard BMS, the motherboard will not recognize it and its use could be reduce. With 9B1 S2, if only one battery is connected (or recognized) the max speed would be 2 kph lower than with 2 batteries connected. So it's impossible to do same thing as I have done for my 9B1 E because of new secure BMS (with its own FW) Link to comment Share on other sites More sharing options...
smallexis Posted July 14, 2017 Author Share Posted July 14, 2017 3 hours ago, alex87 said: i also have a doubt about the using of the 15s balancer..... do you only use the balancer to charge the full pack, or you continue to use a xt60/xt90 connector with 63v ? This is how the BMS's seller advise me to connect cells to the BMS. Link to comment Share on other sites More sharing options...
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