Battery

Battery

A battery is a device consisting of one or more electrochemical cells with external connections for powering electrical devices. When a battery is supplying electric power, its positive terminal is the cathode and its negative terminal is the anode. The terminal marked negative is the source of electrons that will flow through an external electric circuit to the positive terminal. When a battery is connected to an external circuit, electrochemical reactions convert stored chemical energy into electrical energy.

History

The history of batteries dates back to the Baghdad Battery, which is believed to have been created in the early centuries AD. The modern battery was invented by Alessandro Volta in 1800, known as the Voltaic pile. This invention led to the development of many types of batteries, including the lead-acid battery invented by Gaston Planté in 1859 and the nickel-cadmium battery developed by Waldemar Jungner in 1899.

Types of Batteries

Batteries are classified into two broad categories:

• Primary batteries: These are designed to be used once and discarded. They cannot be recharged. Examples include alkaline batteries and zinc-carbon batteries.
• Secondary batteries: These are rechargeable and can be used multiple times. Examples include lithium-ion batteries, nickel-metal hydride batteries, and lead-acid batteries.

Applications

Batteries are used in a wide range of applications, from small electronic devices like remote controls and smartphones to large-scale applications such as electric vehicles and grid energy storage.

Battery Performance

The performance of a battery is typically measured by its capacity, which is the amount of electric charge it can deliver at a specified voltage. Other important parameters include energy density, power density, and cycle life.

Environmental Impact

The production, use, and disposal of batteries have significant environmental impacts. Recycling programs and the development of more environmentally friendly battery technologies are important for reducing these impacts.

See Also

• Electrochemical cell
• Alkaline battery
• Lithium-ion battery
• Lead-acid battery
• Nickel-cadmium battery
• Electric vehicle
• Grid energy storage
• Recycling