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October 2018

Basic Electronic Electronic

Electronic Battery | Types of battery

October 30, 2018

What is Battery :

A battery could be a self-contained, chemical electrical converter which will manufacture a restricted quantity of power where it’s required. in contrast to traditional electricity, that flows to your home through wires that start in a very station, electric battery slowly converts chemicals packed within it into power, usually discharged over a number of days, weeks, months, or perhaps years.


an electric battery consists of 1 or additional chemical science cells, that rework keep energy directly into power. once AN external load connects to the electric battery, electrons cross from the negative to the positive terminal, making AN electrical current. This current might power a motor, a light-weight bulb, a clock, a computer, a mobile phone, and different electronic devices or instrumentality. Battery flow speed is set by the battery’s internal resistance and out of doors load.

Battery Symbol

           Fig: Battery Symbol

When the anode and cathode of a battery are connected to a circuit, a chemical process takes place between the anode and also the solution. This reaction causes electrons to flow through the circuit and back to the cathode wherever another chemical process takes place. once the fabric within the cathode or anode is consumed or now not ready to be employed in the reaction, the battery is unable to provide electricity. Secondary batteries conjointly referred to as reversible batteries are engineered to be recharged and reused over and over. Secondary batteries typically embody active materials that are assembled in an exceedingly discharged state. These batteries may be recharged upon the applying of electrical current, that helps to reverse the chemical reactions that occur once the battery is employed.

Main parts of battery :

The basic electromagnetic unit within the electric battery is termed a cell, and it consists of 3 main bits. There square measure 2 electrodes ANd a chemical known as a solution between them. For our convenience and safety, these items square measure sometimes packed within a metal or plastic outer case. There square measure 2 a lot of handy electrical terminals, marked with a and (positive) and minus (negative), on the skin connected to the electrodes that square measure within. At the identical time, electrons march from one terminal to the opposite through the outer circuit, powering regardless of the battery is connected to. This method continues till the solution is totally remodeled. At that time, the ions stop moving through the solution, the electrons stop flowing through the circuit, and therefore the battery is flat.

How does battery work?

The chemical reactions within the battery cause a build-up of electrons at the anode. This ends up in an associated electrical distinction between the anode and therefore the cathode. you’ll be able to consider this distinction as an associate unstable build-up of the electrons. The electrons wish to set up themselves to induce obviate this distinction. however, they are doing this in a very sure method. Electrons repel one another and take a look at to travel to an area with fewer electrons.

In a battery, the sole place to travel is to the cathode. But, the solution keeps the electrons from going straight from the anode to the cathode inside the battery. once the circuit is closed the electrons are going to be able to get to the cathode. within the image on top of, the electrons near the wire, lighting the sunshine bulb on the means. I’ve unwrapped a clip to create a chunk of connecting wire and I am holding that between rock bottom of the battery and therefore the facet of the bulb. If you look closely, you’ll be able to see the bulb is shining. that is as a result of electrons square measure march through it. this is often a method of describing however electrical potential causes electrons to flow through the circuit. after you recharge a battery, you modify the direction of the flow of electrons victimization another power supply, like star panels. The chemical science processes happen in reverse, and also the anode and cathode area unit improved to their original state and might once more offer full power.

Anode and Cathode :

The battery’s positive terminal (shown simply higher than my left thumb within the exposure and colored red within the design below) is connected to a positive conductor that is principally hidden within the battery. we have a tendency to decision this the cathode. The outer case and therefore the bottom of the battery structure the negative terminal, or negative conductor, that is additionally referred to as the anode and colored inexperienced within the design. The clip wire is drawn within the art by the blue line.

Types of battery :

Batteries usually will be classified into completely different classes and kinds, starting from chemical composition, size, type issue, and use cases, however underneath all of those square measure 2 major battery types:

  1. Primary Batteries
  2. Secondary Batteries

01. Primary Batteries :

Primary batteries area unit batteries that can’t be recharged once depleted. Primary batteries area unit fabricated from chemistry cells whose chemistry reaction can’t be reversed. Primary batteries exist in several forms starting from coin cells to AA batteries. they’re normally employed in standalone applications wherever charging is impractical or not possible. a decent example of that is in military-grade devices and battery power-driven instrumentality. it’ll be impractical to use reversible batteries as recharging electric battery are going to be the final thing within the mind of the troopers. Primary batteries perpetually have high specific energy and also the systems within which {they area unit|they’re} used are perpetually designed to consume an occasional quantity of power to alter the battery last as long as potential.

Primary Batteries Battery

               Fig: Primary Battery

The most well-liked kind of primary batteries is alkalescent batteries. they need a high specific energy and square measure environmentally friendly, cost-efficient and don’t leak even once absolutely discharged. they’ll be held on for many years, have a decent safety record and may be carried on the associate craft while not being subject to world organization Transport and different rules. the sole drawback to alkalescent batteries is that the low load current, that limits its use to devices with low current needs like remote controls, flashlights, and movable amusement devices.

02. Secondary Batteries :

Secondary batteries square measure batteries with chemical science cells whose chemical reactions is reversed by applying an exact voltage to the battery within the reversed direction. conjointly said as reversible batteries, secondary cells, not like primary cells, is recharged once the energy on the battery has been spent. Secondary batteries are any classified into many alternative varieties supported their chemistry. this can be important as a result of the chemistry determines the number of the attributes of the battery together with its specific energy, cycle life, shelf life, and value to say some.

Secondary Batteries Battery

           Fig: Secondary Battery

They are usually employed in high drain applications and alternative eventualities wherever it’ll be either too pricey or unfeasible to use single charge batteries. little capability secondary batteries square measure accustomed power moveable electronic devices like mobile phones, and alternative gadgets and appliances whereas heavy batteries square measure employed in powering numerous electrical vehicles and alternative high drain applications like load leveling in electricity generation. they’re conjointly used as standalone power sources aboard Inverters to produce electricity.

There are basically four major chemistries for rechargeable batteries:

  • Lithium-ion(Li-ion).
  • Nickel Cadmium(Ni-Cd).
  • Nickel-Metal Hydride(Ni-MH).
  • Lead-Acid.

01. Lithium-ion(Li-ion) :

Lithium-ion batteries are the fastest-growing form of rechargeables; there are most likely lithium-ion batteries in your cellular phone, MP3 player, and laptop personal computer. what is thus sensible regarding lithium? it is a light-weight metal that simply forms ions, thus it’s glorious for creating batteries. the most recent lithium-ion batteries will store regarding double the maximum amount of energy as ancient NiCd rechargeables, work on higher voltages, and are a lot of environmentally friendly, however, do not last as long. Even so, they will be charged and discharged many times and usually last many years, thus they are nice for everyday use in electronic gadgets that are not meant to last that long.

Lithium particle batteries usually possess high energy density, very little or no memory result and low self-discharge compared to alternative battery sorts. Their chemistry aboard performance and value vary across completely different use cases for instance, Li-ion batteries utilized in hand-held electronic devices area unit typically supported Li metallic element compound (LiCoO2) that provides high energy density and low safety risks once broken whereas Li-ion batteries supported Li iron phosphate which provides a lower energy density area unit safer thanks to a reduced probability of unfortunate events happening area unit wide utilized in powering electrical tools and medical instrumentality.

Lithium ion Battery

                  Fig: Lithium-ion Battery

The properties of Lithium-ion(Li-ion) batteries :

  • Specific Energy: 100: 265W-h/kg.
  • Energy Density: 250: 693 W-h/L.
  • Specific Power: 250: 340 W/kg.
  • Charge/discharge percentage: 80-90%.
  • Cycle Durability: 400: 1200 cycles.
  • Nominal cell voltage: NMC 3.6/3.85V.

02. Nickel Cadmium(Ni-Cd) :

The nickel-cadmium battery (NiCd battery or storage battery) may be a variety of reversible battery that is developed victimization nickel compound hydroxide and aluminous Cd as electrodes. Ni-Cd batteries stand out maintaining voltage and holding a charge once not in use. However, NI-Cd batteries simply fall a victim of the dreadful “memory” result once a part charged a battery is recharged, lowering the long-term capability of the battery.

In comparison with different styles of reversible cells, Ni-Cd batteries provide smart lifecycle and performance at low temperatures with a good capability however their most vital advantage is their ability to deliver their full rated capability at high discharge rates. they’re offered in numerous sizes together with the sizes used for alkalic batteries, AAA to D. Ni-Cd cells are used severally or assembled in packs of 2 or a lot of cells. the little packs’ are utilized in moveable devices, physical science, and toys whereas the larger ones realize application in craft beginning batteries, electric vehicles, and standby power provide.


       Fig: Nickel-cadmium Battery

The properties of Nickel-Cadmium batteries :

  • Specific Energy: 40-60W-h/kg.
  • Energy Density: 50-150 W-h/L.
  • Specific Power: 150W/kg.
  • Charge/discharge efficiency: 70-90%.
  • Self-discharge rate: 10%/month.
  • Cycle durability/life: 2000cycles.

03. Nickel-Metal Hydride(Ni-MH) :

Nickel metal binary compound batteries add the same means, however, suffer less from the questionable “memory result.” They became a well-liked different to NiCd batteries within the Nineteen Nineties, part thanks to environmental considerations concerning atomic number 48. NiMH batteries work additional effectively in gadgets like cell phones, that square measure typically “topped-up” with a fast recharge rather than a whole discharge and recharge. The chemical action at the positive conductor of batteries is analogous thereto of the nickel-cadmium cell (NiCd), with each battery kind exploitation identical nickel compound hydroxide (NiOOH). However, the negative electrodes in Nickel-Metal binary compound use a hydrogen-absorbing alloy rather than atomic number 48 that is employed in NiCd batteries.

NiMH batteries notice application in high drain devices thanks to their high capability and energy density. A NiMH battery will possess 2 to 3 times the capability of a NiCd battery of identical size, and its energy density will approach that of a lithium-ion battery. in contrast to the NiCd chemistry, batteries supported the NiMH chemistry aren’t vulnerable to the “memory” result that NiCads expertise.


    Fig: Nickel Metal Hydride Battery

The properties of batteries based on the Nickel-metal hydride batteries :

  • Specific Energy: 60-120h/kg.
  • Energy Density: 140-300 Wh/L.
  • Specific Power: 250-1000 W/kg.
  • Charge/discharge efficiency: 66% – 92%.
  • Self-discharge rate: 1.3-2.9%/month at 20oC.
  • Cycle Durability/life: 180 -2000.

04. Lead-Acid :

With AN overall rating of twelve volts, they need six separate cells, every manufacturing two volts. artlessly reduced to its basic parts, every cell includes a “spongy” lead metal conductor (negative), a lead oxide conductor (positive), and an acid solution. because the battery discharges, each electrode become coated with lead sulfate and therefore the acid is basically born-again into the water, whereas electrons emanate around the external circuit to produce power. Lead acid batteries have the terribly low energy to volume and energy to weight quantitative relations however it’s a comparatively massive power to weight ratio and as a result, will provide immense surge currents once required. These attributes aboard its low value create these batteries enticing to be used in many high current applications like powering automobile starter motors and for storage in backup power provides.


            Fig: Lead-Acid Battery