sarankirthic/18650

18650 li-ion cells and how to make a BMS for them.

18650

This repository contains my research on what Li-ion batteries are, how they work and how i created a battery managment system for these cells must have the following components in-order to charge/discharge the li-ion battery saftely:

• Overcharge
• Over-discharge
• Discharge too quickly

Warning

li-ion batteries are highly dangerous. They can catch fire or explode if mishandled. Proceed with caution at your own risk.

Content

• Introduction
• Terms
• Application
• Resources

What is 18650

Its a secret🤫, do not tell anyone. They are lithium ion batteries.

• Lithium ion battery is an advanced battery technology that uses lithium ions as key component of its electrochemical reaction.
• I will discuss about the process in detail in the respective topic guide.
• Right now just remember that the lithium ions move from the negative electrode through an electrolyte to the positive electrode during discharge, and back when charging.

Advantages of li-ion Battery

• Lithium ion batteries are one of the highest energy dense batteries in the world today.
  • They can store up to 100-265 Wh/kg or 250-670 Wh/L.
• In addition to this they can celiver upto 3.6V.
  • This is 3 times higher then the Ni-Cd or Ni-Mh battery technologies.
  • They can deliver large amounts of current for higher-power applications.
• Lithum Ion batteries require low maintenance
• They do not require scheduled cycling to maintain thier battery life.
• Li-ion batteries have no memory effect.
  • Memory effect is a detrimental process where repeated partial discharge/charge cycles can cause a battery to "remember" a lower capacity.
• Li-ion batteries have a low self-discharge rate of 1.5-2 % per month.
• They are easily disposable because they are not made of toxic materials like cadmium.

Disadvantages of li-ionn Battery

Development

The 18650 cells are Lithium-ion battery. Lithium-ion battery is a type of rechargeable battery.

The first prototype of the Li-ion battery was developed by Akira Yoshino. in 1985, based on the research by John Goodenough, M.Stanley Whittingham, Rachid Yazami and koichi Mizushima during 1970-1980s.

The first commercial batteries were developed by sony and Asahi Kasei team led by Yoshio Nishi in 1991. For more information click here.

Uses

Due to the advantages the li-ion batteries have displace the Ni-Cd batteries in portable electronic devices like laptops and smart phones.

These batteries are also help in millitary and aerospace applications.

Github Profile

Explore my GitHub repo's for more content like this.

Reference

Clean Energy Institute - Lithium-ion Battery.

18650's Issues

Commit README.md

Update the README.md