🔋 How does a small battery keep "electricity" inside?


Mobile phones, EVs or Power Banks seem to store electricity and release it when we need it, but the battery doesn't actually store electricity like we store water in a tank. 😆

What it stores is chemical energy and turns it back into electrical energy when we use it.

⚡ The heart is the movement of "ions" and "electrons."

In Lithium-ion batteries, there are key elements, e.g.

🔵 Anode

🟠 Cathode.

🧪 Electrolyte

🧱 Separator

When we operate the battery or Discharge, the chemical reaction causes electrons to flow through the external circuit to feed the device.

Li ions, meanwhile, move inside the cell through the Electrolyte to maintain charge balance.

In other words,

Electron running outside → working for us

Lithium ion moves inside → makes the process continue.

🔌 What about charging?

The charger uses external power, forcing the process to be born in the reverse direction, causing the system to re-enter a state where chemical energy is available for us to use.

This is why the rechargeable battery can

Charge → Discharge → Charge → Discharge

Get many rounds

But not forever, sir.

📉 Why do you use it for so long? Battery Health reduces?

Every time the charge / Discharge inside the battery, both the reaction we want and a small side reaction occur.

Through many Cycles, the internal materials gradually change, resulting in reduced capacity and power supply capacity.

And one of the main enemies is...

🔥 Heat

High temperatures can speed up many degeneration processes within the battery.

This is why mobile and EV vehicles have a temperature management system and Battery Management System (BMS) takes care of the voltage, current, temperature and state of the battery.

🤔 Then why Lithium?

Lithium is a very light element and has electrochemical properties that allow it to build cells with high Specific Energy.

In other words,

Store a lot of energy without making a huge battery.

This feature is very important with mobile laptops and especially electric cars because every kilogram of weight affects their use.

🚗 EV batteries are not just "big mobile batteries."

The Battery Pack of an electric car consists of many cells, connected and controlled together.

Must have both

🌡️ Thermal Management

🧠 Battery Management System

⚡ Voltage / Current Monitoring

🛡️ Safety system.

Because the energy stored inside is very high.

What I like about batteries is...

When you look at a thin cell phone in your hand, you can only see 67% of the battery.

But behind the numbers are chemistry, physics, materials science, electrical engineering and control systems working together all the time. 🔋⚡

The ordinary things we use every day. Sometimes there is more science hidden than I think.

# Champion's record # Science # Lithium battery # All around knowledge