Do not try this at home. There is a serious risk of fire and/or explosion.
I’m not responsible if you were injured while doing this.
Unless you know what you are doing, don’t try this, like seriously.
Earlier today, I found my sister’s laptop’s old battery. I was supposed to throw it away, but since I’m a scavenger, I decided to open it up.
Old laptop battery.
Flat head screwdriver.
Box cutter or kitchen knife.
Exert force judiciously.
Sharp tools may cut you.
Battery may explode in your face, worst case scenario.
I followed this video on YouTube from start to end.
Found 6 Li-ion cells in a 3S2P matrix. They were in a good condition. But the cell-to-cell connections were damaged during disassembly.
Was I scared?
Hell yeah! My body parts aren’t replaceable.
Did I see sparks?
Yes. When I drove the screwdriver into the battery, it shorted out something on the BMS (Battery Management System) circuit.
See this thread to learn how these cells could be used to make a battery pack.
For educating us on Battery packs and how to charge them. Very useful experiments
Embedded systems engineer, Founder @Valetron Systems, Blogger @www.raviyp.com
Hi Harsha Alva
Sorry i havent worked on multi cell lithium batteries before. So i am not familiar with the concept of balanced charging (Learnt from google now ). But we can use Lithium battery fuel guages like one mentioned here http://www.ti.com/lit/an/slua300/slua300.pdf. Texas instruments BQ series has complete solutions for these applications. I came across BQ24618 but didnt find balanced charging option mentioned anywhere clearly.
Again, these are chips on which we need to build upon. I havent came across readymade boards though. Will be following you to learn more on this 😃