5 $ Solar Power Bank From Recycled Laptop Battery

As some of you know that my college was having a science exhibition , their was also a project display competition going for the Juniors. My friend was interested to participate in that , they asked me what to make i suggested them this project and mentored them while making so their can be less photos as they were in a rush for the competition.

BTW this solar power bank won the contest as the grand winner of Inception 2016.

Do Congrats Them with a lovely comment. <3

Here are the list of components

• 5V solar cell
• 3V to 5V Boost converter
• TP4056 Module with protection circuit
• 18650 battery (Salvage also linked how to )
• Swtich

Tools you will need

• Soldering Iron
• File
• Dremel or rotary tool
• solder
• glue gun
• black tape
• Double sided tape

First step will be to attach the solar panel to the box for that we need to use double sided tapes.

I used 3M 's once as they are thin an also the bond is berry strong ,

You can find it in you local stores.

We drill two holes for the solar panel using our dremel.

We use a 0.8 drill bit for the work.

Then peeling off the wrap from the double sided tape we attach it to the box

If the slots are not cut the USB in and out can't be fitted inside the case.

to make the slot we first drill a hole and then using our Dremel silicon carbide grinding bit.

take the rpm to 8k and slow grind the hole making it the shape of a micro USB.

for the USB Female slot we need a bigger slot we drill a couples of holes .

and then grind to make them joined and also bigger then by using the file we smooth it .

About the charger module

last time i used a tp4056 without protection at output so that could have damaged the batteries if the where discharged below the under voltage specified by the manufacturer. the tp4056 comes with a DW01 IC which acts as a under voltage protection for the cell.

The Boost Connveter

A boost converter is a DC-to-DC power converter with an output voltage greater than its input voltage. It is a class of switched-mode power supply (SMPS) containing at least two semiconductors (a diode and a transistor) and at least one energy storage element, a capacitor, inductor, or the two in combination. Filters made of capacitors (sometimes in combination with inductors) are normally added to the output of the converter to reduce output voltage ripple.
Boost converters are easily available and they are cheap i bought a 1A 5V Boast converter.

NOTE :
Power input is equal to power output Input Voltage x Input Current = Output Voltage x Output Current

The Boost converter has two input just input + and input - Be careful with polarity

Soldering the lithium Ion battery

Soldering Li-Ion may be a huge downside even for the knowledgeable techs out there.Many try and solder Li-Ion cells or phone batteries. it's not suggested by the battery makers to heat them up regardless the explanation.By victimization heat on Li-Ion cells, you'll be able to harm the plastic extractor, pressure protections or maybe the most internal metal layers.

if your hand tool takes quite an heap to heat up (30 sec +), take away it’s basketball shot favor of a diluent one. A 1mm wire tip can heat up considerably quicker than a 2mm wire tip. don't exaggerate tho'. If it’s too skinny, it'lls often.

I had to use and take away quickly to avoid harm. victimization pointed Tip is additionally higher

Connections

The Connections is giving in the diagram.