Parameterized battery pack with contacts
Derived from
Description
NOW you can print your own fully-functional battery pack :-)
For every battery there are two embedded nuts in contact with the positive and negative poles. Two metal M3 bolts are inserted from the outside. They will contact with the poles. Now, you have a wonderful electrical access to the battery!!
I have tested with 2-AAA and 4-AAA battery packs. It worked like a charm :-)
In addition, I have added more parameters for generating the battery pack: the thickness of the bottom, front and rear, and side walls as well as the distance between two batteries.
Update: Jan/30/2011. Added the contribution of eaglepex ( thingiverse.com/eagleapex ). Now the batteries can also be in serial connection changing the ser parameter
Instructions
* Print!
* Embed the nuts (1)
* Insert the batteries (2)
* Insert the bolts
* Set the electrical connections (3)
(1) There is a simple and powerful trick to embed the nuts into their slots (as shown in the pictures). Insert a M3 12mm bolt with a washer form the outside. Add the nut in the inside part. Screw the bolt until the nut reach the socket. Now, put the nut in the correct orientation so that it can enter the socket. Screw the bolts until the nut fits perfectly. Then remove the bolt. The nut will remain in its socket.
(2) WARNING: The batteries can be inserted with different orientations. Make sure they are inserted with alternating poles: +, -, +, - so that they can be connected in serial.
(3) Once the bolts are put, it is time to set the electrical connections. Connect the batteries in serial (Be careful of the short cuts!). It can be used standard wires. Or alternatively you can use Clips, as shown in the pictures.
Instruction for building a 2-battery-pack
See the following images: fotos.iearobotics.com/index.php?album=objetos-3dℑ=dsc01654.jpg
("Sig" means Next, "Ant" means Prev)
Instruction for building a 4-battery-pack
See the following images: fotos.iearobotics.com/index.php?album=objetos-3dℑ=dsc01674.jpg
("Sig" means Next, "Ant" means Prev)
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Can you add the tag customizer to this thing http://www.thingiverse.com/tag... so I can use thingiverse customizer to change design?
I didn't have the right screws, but scaling up by 1.05 allowed me to make it work. I also had sharp tipped screws so I put some scrap on the ends. Worked out really well for my kids science project.
Would someone be willing to make a 6 cell version and upload? I'm not an opencad user... :-D
It could be added the option to screw on the battery pack directly into our designs...
I think I'll explain myself better with an image
This part is freakin great! Now if you'd just sign up with Flattr... :)
I added a variable to make a longer case for 2 AA's or anything.
Under "Implementation" it now reads:
//-- Battery dimensions: series, width, height and length. Change ser for batteries in series along the case.
ser=2;
w=typ[0];
h=w;
l=typ[1]*ser;
I wanted to make a pointer kind of thing.
I was able to use this for min21 batteries as well where MIN21 = [ 10.2, 29.5 ];
What's got me excited is how easily people will be able to merge these with robot designs. The vitamin list for an arduino servo bot is now:
*Arduino
*2 Servos
*Nuts and bolts
*batteries
It may be nice if the entire unit was longer so the head of the screw could be on the inside with the nut , then you would have a stud sticking out for attaching the wires.
Yes. That's the reason why I have also parameterized the wall thickness. Now the fr_thick parameter is 3.5 (the front and rear walls, where the screws are located). It can be change to another value (for example 6) so that the screw's head is in touch with the wall.
the bolts wouldn't hold the batteries in with that setup. you could use long set screws with allen heads (like the bolts that hold the pulleys on the stepper motors but much larger
This is intense! I love how quickly these printable battery packs are evolving!
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Thanks for sharing this! It was really great being able to have a battery pack in my hand 45 minutes after I realized that I needed one.