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Topic: Batteries are tough (Read 380 times) previous topic - next topic

TimmyCNinja

I am trying to make a wearable based on arduino, however it is designed to be submersible. We are going to be encapsulating the entire device in waterproof material and recharging using wireless induction. However I know that batteries give off gas sometimes. Obviously some batteries do not give off gas, like the batteries in medical devices. We talked to medical device battery manufactures but those are WAY expensive($300/unit+). Does anyone have any suggestions on how to overcome the gassing issue or know where I could find a battery to suit my purpose?

CrossRoads

I think batteries only outgas when they are overcharged. Make your charging circuit smart enough not to let that happen.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

DavidOConnor

You could use an IP67 or IP68 enclosure that you could open up for charging. Or you could design a sealed enclosure to accept outgassing.

spycatcher2k

Or LiPO - No Gas under normal charging.
Drew.
http://www.uk-pcb.co.uk - My UK Based PCB Fab & Assembly Company
Design work undertaken
SMD & Thru-Hole assembly

TimmyCNinja

Are there additional concerns in terms of using magnetic resonance for charging. Thanks for the responses so far. especially to Crossroads who is always answering my post and helping me immensely!!!!!!!

raschemmel

Quote
Are there additional concerns in terms of using magnetic resonance for charging. 

What does that mean ? You stated that you were going to be using magnetic induction charging as if it were a fact. Are you now asking how to do that ? (I hope not)
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,
DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

Grumpy_Mike

Quote
recharging using wireless induction.

and
Quote
magnetic resonance for charging

Are not the same thing. In fact I am not sure what the latter means.

raschemmel

Magnetic resonance as in Nuclear Magnetic Resonance as in MRI (magnetic resonance imaging, used in hospitals).
I don't know where the OP got the "resonance" term from. I think he just pulled it out of the air.
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,
DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

Grumpy_Mike

Yes I was a University Physics lecturer ( professor to those in the U.S. ) so I know what MNR is, but what I don't know is what, "magnetic resonance for charging" is.

AWOL

Quote
Are there additional concerns in terms of using magnetic resonance for charging.

Perhaps you mean induction.
The circuit should be resonant for efficiency.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

raschemmel

Oh, Ok , then an LC oscillator on the transmitter that oscillates when XL=XC, or RESONANCE, COUPLED
to the RECIEVER inducing oscillation across the magnetic field gap.
http://en.wikipedia.org/wiki/Resonant_inductive_coupling
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,
DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

Xpendable


Or LiPO - No Gas under normal charging.


On the other hand, they can explode if they come into contact with water!  Just saying...
Creator of the MonsterShield
http://www.hauntsoft.com

raschemmel

FYI , Lipo's burst into flames (in your hands) if you puncture the battery with a metalic object, like a pocket knife.
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,
DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

TimmyCNinja

I am using induction, as in this part
http://www.adafruit.com/products/1407
Sorry for the confusion.

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