How Batteries Work: Energy Storage in Cells and Electric Vehicles
Learn how batteries work, from basic cell chemistry to electric vehicle technology. Discover how chemical energy is stored and converted into electricity.
Best quote from How Batteries Work: Energy Storage in Cells and Electric Vehicles
We don’t actually store electricity at all. Instead, we perform a sort of alchemical trick where we force that kinetic energy to transform into a quiet, resting state called chemical potential energy.
This audio lesson was created by a BeFreed community member
How does a battery work and if you can explain how a battery works then how does a large cell or a large battery like an electric vehicle? How is electricity able to be stored and then used later it doesn’t make any sense to me. 
Frequently Asked Questions
Batteries do not actually store electricity in its raw form; instead, they store chemical energy. Through a process called battery cell chemistry, a chemical reaction occurs between the internal components—the anode, cathode, and electrolyte. When you connect a device, this reaction triggers a flow of electrons, converting that stored chemical energy into the electricity needed to power your electronics or vehicles.
While the fundamental science of how batteries work remains the same, electric vehicle battery technology involves scaling. An EV battery is not just one giant cell; it is a massive pack composed of thousands of individual battery cells working together. These cells are managed by sophisticated software to ensure energy storage is efficient, safe, and capable of providing the high voltage required to move a heavy vehicle.
Energy storage is explained as a chemical process because electricity itself is difficult to hold onto for long periods. By using specific materials that react with one another, we can 'park' energy in a stable chemical state. When the circuit is closed, the chemical energy to electricity conversion begins, allowing the stored power to be used later when it is actually needed for your car or phone.
Inside a battery cell, ions move through an electrolyte while electrons are forced through an external circuit. This movement is what creates the electrical current. In rechargeable batteries, like those found in EV battery storage, this process can be reversed by applying power, which pushes the ions back to their starting position, effectively resetting the chemical potential for future use.
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From Columbia University alumni built in San Francisco
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
