Building and Abusing a Massive Battery - Making a Coilgun: Part 6
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- čas přidán 22. 08. 2020
- This massive battery can discharge over 1200 amps at 33.6 volts. It is comprised of 16 SPIM08HP lithium-ion batteries. Today I design, build, and run some informal yet entertaining tests. This battery will be the power source for my upcoming coilgun.
Gain access to CAD files and support my work - / levijanssen - Věda a technologie
Built something similar for college engineering week, we had a very powerful rail gun that used 2 forklift batteries (this was 30 years ago) and used several car stater solenoids that can switch up to 300 amps as it latches power to a car starter. We also used cryogenics to cool the system for the very short fire times. We could only get 4 or 5 firings before we needed to disassemble the starter solenoids and file off the scorch and melt marks. We destroyed everyone won our division and then the design was banned for all future competitions. Guess they never thought three different engineering disciplines would collude to build this design. It was also very dangerous, especially when your playing around with that much current. Ours were lead acid which I would prefer over your battery when you melt your core and a fire starts.
It was cool watching the flame unzip the pencil!😁
As you said, this is not in a "safe" state right now, which I'm sure you'll address eventually. I would just like to suggest that you put a plastic/rubber barrier between the separated battery tab segments. Right now, if one of your m6 screws goes loose, a battery tab can be nudged out into the neighboring unit. Additionally, using star washers or some other positive grip/tension fastener may be useful. I used to design industrial beverage machines and we had to worry about connections for 5kw heating units vibrating loose. Last thing, watch the video of Louis Rossman's e-bike battery exploding. Home made kits like this can be dangerous AF. You seem like a smart person, so try to be smarter with your testing in the future and don't squat over your experimental battery while you purposefully short the leads with no cutoff or breaker in the circuit. Please don't hurt yourself. This is the best coilgun project I've seen in a while and I'm looking forward to more episodes.
I had to skip him shorting the battery to the threaded rod, the man basically made a beefed up spot welder with a flammable trafo. One unlucky contact and the leads are welded to the rod with 0 current protection. I'm not the most cautious man but that gave me the heebies
Awesome project. On the cost of the fuse, sure it's more expensive than the battery, but the value of it isn't to protect the battery, it's to protect anything the battery could damage, including you!
His palms were sweaty. knees weak, arm spaghetti.
the next video: how to remove balls from a tree
And teeth
A breaker switch would ease your fear
That needs to go on one of those electric bicycles and put wheelie bars on the back and take it to the drag strip.. Normally, one would say, for a muscle car, "gear it to the hilt"... but, for the electric drag bicycle, "slam as much voltage at it as possible"... it would only need to harness that massive current dump for about 8 seconds.. lol..
I like your experimentation, but...as a sparky (electrician) copper exploding from electrical overload can be around 50 thousand feet a second....molten hot copper. Please wear some sort of gloves...unless you like pain!
Electricity dc or ac is an unseen danger.
I'd love to see you continue, uninjured.
Anyway, fatherly concern performed!
Love to see the possibly finished Mk1 coil!
As a side note with your multi coil set up have you considered any lateral flex from projectile mass and energized coil on the barrel geometry?
Subscribed.
really want to see this project continue!
u forgot to add this to the playlist
also nice welder
Cool project, Im excited to see more!
haha so scared of sparks he says "ok im done im done" :p come on boy man up a little!! lol :p
Great job with your battery bus bars I am impressed.
Awesome project. Just a tip for the router, using as short of a end mill as possible will result in fewer vibrations while cutting. I’m my experience this is the most common cause for bad cuts on low power Cnc router.
Cool video, odd nit pick but please put a guard on that angle grinder, zip wheels are unpleasant when they explode. One of them will explode on you one day and you'll be happier with a guard. Also, wear a welding helmet or at least oxy/plasma cutting goggles when making those sparks, those arcs are comparable to welding arcs and those spots in your vision you mentioned are not a good sign.
Maybe try hard wiring the terminals to some load with a beefy switch in series, makes it much easier to sustain electrical contact to get a reading.
Safety Tip: Use a wooden/better non-conductive rod to "place the thing", and have the electrodes in a spot.
Find a multimeter that measures inrush current. Inrush current duration is about 5 ms, a meter that reads inrush should be able to measure the sparks amp draw.
I really did like the shape of those batteries, so compact.
Good idea with thin coils👍🏻
To save cost you could have run multiple lower amperage fuses. I found 500 amp 32v fuses online for a pretty good price.
Brilliant.
Hi clean build on the battery.
Where did you get that balancer?
i think i might use the buss bar idea over what i did for a bike pack 54V 8Ah ~16mi range in the mountains.
You “shouldn’t be doing this”
/s
Great work you. Be careful and maybe the force be with you
Couldn't you find some 30-40 v heating element lying around or an electric motor to test it with proper load
Just use a thin wire as fuse that is basically what they are. Have you done any welding with it? Where you get that active balancer?
@Levi Janssen - hey bro! I have either 20 or 24 of these same exact battery packs WAITING FOR ME TO GROW SOME BALLS... I have to say that the CNC bus bars are THE BEST METHOD I HAVE SEEN ANYWHERE when it comes to connecting these specific cells. Having that CNC jammie (and knowing how to use it) really is such a crucial component in this game between the flexibility it provides and the TIME IT SAVES by not having to wait for a “CHINA PAK” or having to return 3 items just to finally get the right one...
This video just made me realize it may be time to start shopping around for a USED one.... ANY ADVICE???
Lastly, if u don’t mind, a few questions:
1. what made you decide on this specific amount of cells instead of a higher amount? Were you aiming for a specific amperage?
2. Do you wish you had gotten more to add to this now that it’s built?
3. what would be your next “level” (amount of cells) if you did decide to increase the cell count and power?? Why? And how much power would that next jump up produce??
Some may say this type of video is a slap in the face to “SERIOUS DIY’ers” or battery makers due to the reckless aspects and the misuse shown.... HOWEVER - In this day & age, everyone is very entitled and if say the majority take most things for granted - having ZERO CLUE how much raw power is in many of their daily possessions.. this can be a deadly oversight, but your video REVEALS how great a safety concern “batteries” can be.
I think that fact alone makes your video as appropriate as any other. The DANGERS involved are never really explained. Seeing is believing, and EVEN I now have a much healthier fear than I did before despite already “knowing” how much juice is in these things.
Great stuff - Now how much longer until the RAIL GUN?!???
If you use a low voltage high current source, you n ed to deal with two transients. And if you use high voltage capacitor bank, you only need to deal with one. I strongly advise toward making at least a few prototypes before going on with you design. Math usually doesn't count up and the triac/ight/mos will probably stuck on.
i saw some magnetic current arcs on the rod, acting like an inductor; this(the opening of DC power lines with significant inductance) caused the death of many of the early DC power technicians . interrupting the DC current through a coil without a snubber can kill as easily as can a charged capacitor. note that you can make high power diodes using conductive water with Al as one electrode and Fe or steel for other; and high power resistors as well with water.
He is so clever how does this man do this
5:12 The way the part moves on your retraction makes me a bit uncomfortable. Is that ideal?
Just sit on top of it 😂
Great
where did you get the batteries?
i need that batterys
That yellow tape on my cells didnt insulate my battery terminals. It blew right thru it. It only sparks when current is disconnected, if you held the cables on the threaded rod it would not spark. I hope you have a great plan for switching on/off. I use forklift solanoids. Anything less has melted the contacts closed. Btw do not over discharge theae cells!!!!!! Or charge them as lipo.
plz no battery abuse sir.
Would you be willing to share where you got those cells? I have been looking for very thin high current cells for a robot I am working on, and those seem like they would work quite well.
Probably from batteryhookup
An american guy using metric screws :D
What are the chances of you selling me some of the connectors you made to connect them together? I've been investigating and yours are the best I've seen. I just bought 48 of these and want to build a 4s12P pack to power a small boat.
Did you get it built? BatteryHookup has the ones for 6P units and two of them in parallel would get you to the 12 P configuration. Theirs are factory and are copper with a steel plate on the connectors and bare copper on the end terminals.
@@gravelydon7072 Finally got some from BHU.
Dang
Would you use a battery like this one for an electric motorcycle?
Yes. They are high discharge rate batteries which is what is needed to get a DC motor turning. This type of cell was used in a hybrid bus.
hi can you shear the file for the bus bard you did , grate video keep it up
Pretty sure he said in another video that he makes all his work available on patreon, which given the quality of his efforts is entirely fair.
Playing with lots of amps, I hope u survive 🙏
You should really consider more space for the pouches to swell up, as they tend to do. Read your manufacturers datasheet for more info. Simple spacing between modules should do the trick.
Datasheets for these cells say that they require compression or they degrade and swell faster.
@@earnwithbots2783 Great to know that, datasheet is always a place to go. :)
@@earnwithbots2783 i can confirm this. Sadly
@@earnwithbots2783 Funny, have you seen how they were assembled at a factory. There is no compression on them until they swell. Here is what you find on the factory units. A steel end plate with 4 lock nuts on it. A bit of foam which fills the space between the steel and the plastic of the first cell. The steel is kept from over compressing by the fact that there is a flanged nut between the steel and the first plastic cell holder on all four rods. Then you have all the cells till the last one. Another four flanged nuts on the last plastic cell holder. Another chunk of foam, another steel end, and four more lock nuts. If you get one of the units rated at 24 Volts and 24 Ah, every fourth cell holder is empty. So both cells on either side of it can swell. On the 36V 48Ah units they are in the 10S6P configuration. They are built the same way except there are no empty cell holders and both terminals come off the top instead of 1 on top and 1 on the bottom like the 24V 7S3P units. I rebuilt my units to 7S4P so mine are rated at 24V and 32 Ah. No empty cell holders.
High voltage gloves are cheaper than a fuse, and certainly cheaper than health insurance; just saying. Have you seen a sustained lithium battery runaway? Flames as long as 30 feet for ~3 minutes. I would guess for your pack size.
including toxic fumes and heavy metal particles. If you have a thermal runaway that is; which looks like what you are trying to achieve with your shorting tests
That’s not abusing. Abusing these is doing a 1P 23s on a golf cart! 😅
you should have discharged all the battery cells before assembly.
Did you really think this through lol you were basically welding without a welders mask, not good for your vision, what do you think happens if you short that powerful of a battery with your body above it lol think buddy