Electric battery

A battery gives power to many things.

It can power a tiny watch. It can even power a big car.

Inside, a battery uses a chemical reaction. This reaction makes tiny bits of energy move. These bits flow out to power your tools.

Some batteries are made for one use. You use them and then throw them away. Other batteries can be used again. You can charge them with power.

Batteries come in many shapes and sizes. Some are small like a button. Some are as big as a room!

They help us use many fun tools. Do you use batteries every day?

A battery is a source of electric power. It is made of one or more electrochemical cells.

These cells use chemical reactions to make electricity.

Inside a battery, there are two main parts. One part is the anode, which is the negative side. The other part is the cathode, which is the positive side.

The negative side is the source of electrons. When you connect a battery to a device, those electrons flow through a circuit. They move toward the positive side. This movement of electrons creates the electricity we use.

There are two main types of batteries. Primary batteries are for single use. You use them once and then throw them away. An example is the alkaline battery in a flashlight. Secondary batteries are rechargeable. You can use an electric current to reverse the chemical changes. This makes them ready to use again.

Lithium-ion batteries are a common type of secondary battery. They power electric cars and many small gadgets. Batteries come in many sizes. Some are tiny like a button. Others are as big as a room!

An electric battery is a source of electric power. It is made of one or more electrochemical cells.

These cells turn stored chemical energy into electrical energy. This allows us to power many different devices. Batteries come in many shapes and sizes. Some are tiny cells used for hearing aids or wristwatches. Other battery banks are as huge as entire rooms. These large banks provide emergency power for data centers.

Inside the battery, a specific thing happens to create power. A battery has a positive terminal called the cathode. It also has a negative terminal called the anode.

The negative terminal is the source of electrons. When you connect a battery to a device, those electrons flow through a circuit. They move toward the positive terminal. This movement happens because the electrons are attracted to positively charged ions. This process is called a redox reaction. It converts high-energy materials into lower-energy products.

People have been studying electricity for a long time. Benjamin Franklin first used the word "battery" in 1749. He used it to describe a set of linked Leyden jar capacitors. He chose this name because it sounded like a military group of weapons working together. Later, in 1800, Alessandro Volta built the first electrochemical battery. He called it a voltaic pile. It was a stack of copper and zinc plates. These plates were separated by paper disks soaked in brine.

Different kinds of batteries serve different needs. Primary batteries are single-use or disposable. The chemical changes inside them cannot be reversed. An alkaline battery used in a flashlight is a common example. Secondary batteries are rechargeable. You can use an electric current to reverse the chemical reactions. This restores the original materials so you can use them again. Lithium-ion batteries are a type of secondary battery. They are used in electric cars and portable electronics. Lead-acid batteries are another type used in cars with engines.

Batteries are becoming more important every year. Between 2010 and 2018, demand grew by 30% each year. Experts think demand will reach 2600 GWh by the year 2030. This growth is happening because of electric transport and new energy grids. Even old batteries can find a second life. A car battery with less than 80% capacity can be repurposed. It can then be used for backup power or renewable energy storage. This helps reduce costs and helps the environment.

An electric battery is a source of electric power. It consists of one or more electrochemical cells that provide external connections to power devices.

These cells function by converting stored chemical energy directly into electrical energy. This conversion occurs through a process involving the energy difference between chemical reactants. When a battery supplies power, it utilizes a specific internal structure. The positive terminal is known as the cathode. The negative terminal is known as the anode.

The anode acts as the source of negatively charged electrons.

To understand how a battery works, we must look at the movement of particles. When a battery is connected to an external electric load, electrons flow through the circuit. These electrons move from the negative anode toward the positive cathode. This movement is driven by the attraction of positively charged ions, or cations. This process triggers a redox reaction, which is a chemical process involving the transfer of electrons. During this reaction, higher energy reactants are converted into lower energy products. The free-energy difference from this chemical change is delivered to the external circuit as electrical energy.

Batteries are categorized into two main types: primary and secondary. Primary batteries are single-use or disposable devices. In these batteries, the electrode materials undergo irreversible changes during discharge. Once the reactants are exhausted, the battery can no longer produce current. A common example is the alkaline battery used in flashlights. In contrast, secondary batteries are rechargeable. These can be discharged and recharged many times. An applied electric current can reverse the chemical reactions to restore the original electrode composition. Lithium-ion batteries for electronics and lead–acid batteries for cars are common secondary examples.

The history of the battery involves several key scientific figures. Benjamin Franklin first used the term "battery" in 1749. He was experimenting with a set of linked Leyden jar capacitors. He chose the name because it resembled a military group of weapons working together. In 1800, Alessandro Volta described the first electrochemical battery, called the voltaic pile. This device was a stack of copper and zinc plates separated by brine-soaked paper disks. Volta originally believed the energy source was inexhaustible. However, Michael Faraday later showed in 1834 that electrode corrosion was an unavoidable consequence.

Early batteries faced many practical limitations. The voltaic pile could not provide a large, sustained current. In 1836, British chemist John Frederic Daniell invented the Daniell cell. This was the first practical source of electricity and became an industry standard for telegraph networks. The Daniell cell used wet cells containing liquid electrolytes, such as copper sulfate and sulfuric acid. While effective, these liquid cells were prone to leakage and were quite fragile. The invention of dry cell batteries near the end of the nineteenth century changed everything. By replacing liquid electrolytes with a paste, batteries finally became practical for portable appliances.

Batteries vary greatly in scale and specific energy. Specific energy refers to the amount of energy stored per unit of mass. Batteries have much lower specific energy than common fuels like gasoline. However, electric motors are more efficient at converting electricity into mechanical work than combustion engines. Batteries range from miniature cells for hearing aids to massive battery banks. These large banks can be the size of entire rooms. They provide emergency power for telephone exchanges and computer data centers.

Today, the battery industry is seeing massive global growth. Between 2010 and 2018, demand grew by 30% annually. This reached a total of 180 GWh in 2018. Experts estimate demand could reach 2600 GWh by 2030, or even 3562 GWh with cost reductions. This growth is driven by the electrification of transport and large-scale electricity grids. Batteries are also being integrated into "smart grids" for demand response. Even used batteries have value. A vehicle battery with less than 80% capacity can be repurposed for renewable energy storage. This secondary use helps reduce costs and environmental impacts.