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What Is a Coin Cell Battery? What Kinds Are There?

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Button batteries have won the praise of the public with their excellent volume advantages and excellent performance in terms of cost performance and service life, and are widely used in daily life. So how much do you know about button batteries? Today I will make a simple analysis from a professional perspective. After reading, you should have a comprehensive understanding.

#1-Button Battery

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Button cell (button cell), also known as button battery, refers to a battery with a size like a small button. The button battery is divided into the same battery from the appearance.

Button batteries are generally common in two types: rechargeable and non-rechargeable, including 3.6V rechargeable lithium-ion button batteries (LIR series) 3V rechargeable lithium-ion button batteries (ML or VL series); non-rechargeable Including 3V lithium manganese button battery (CR series) and 1.5V alkaline zinc manganese button battery (LR and SR series);

The English letters in front of the model name of the button battery indicate the type of the battery. The number indicates the size. The first two numbers indicate the diameter and the last two indicate the thickness. The button battery has a smaller diameter from 4.8mm to 30mm and thickness from 1.0mm to 7.7mm; It is generally used as a backup power supply for various electronic products, such as computer motherboards, electronic watches, electronic dictionaries, electronic scales, memory cards, remote controls, electric toys, etc.;

#2-Application of Button Battery

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Button batteries are widely used in various micro electronic products due to their small size, with diameters ranging from 4.8mm to 30mm and thicknesses ranging from 1.0mm to 7.7mm; they are generally used as backup power supplies for various electronic products, such as Computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, pacemakers, electronic hearing aids, counters, cameras, etc.

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#3-Classification of Button Batteries

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Lithium battery: A common one-time lithium battery is a lithium manganese battery (code C) with a nominal voltage of 3 V. Another less common primary lithium battery is the lithium-carbon fluoride battery (code B) with a nominal voltage of 3 V. In addition, there is a commonly used secondary lithium battery is the ML lithium battery (code ML), with a nominal voltage of 3V. Such as CR2032, CR2016, CR2025

#4-Silver Oxide

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The button battery has the characteristics of long service life and large capacity, and is widely used, and its application amount is the largest. This kind of battery uses silver oxide as the positive electrode, metal zinc powder as the negative electrode, and the electrolyte is potassium hydroxide or sodium hydroxide, and generates electrical energy through the chemical action of zinc and silver oxide. Model AG is the Japanese standard, and SR is the international standard model. Such as SR44, SR41

#5-Silver Peroxide

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The structure of the battery is basically the same as that of the silver oxide button battery, the main difference is that the anode (pylon) of the battery is made of silver peroxide.

#6-Alkaline Manganese

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The battery has large capacity, excellent low-temperature performance, cheap materials and low price, and can meet the requirements of continuous discharge with large current. The disadvantage is that the energy density is not enough, and the discharge voltage is not stable enough. The positive electrode of the alkaline manganese button battery is manganese dioxide, the negative electrode is zinc, and the electrolyte is potassium hydroxide, and its nominal voltage is 1.5V. Such as AG13, AG10, AG0

#7-Mercury

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Also known as mercury battery, it has the characteristics of being able to be used at high temperature, long-term storage, stable discharge voltage and good mechanical properties, but its low-temperature characteristics are not good. The positive electrode of the battery is mercury, the negative electrode is zinc, the electrolyte can be potassium hydroxide or sodium hydroxide, and its nominal voltage is 1.35V.

#8-Lithium Lon

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The nominal voltage of the lithium manganese disposable button battery is 3V, the termination voltage is 2V, and the typical working current is 0.1-0.2mA. It uses manganese dioxide with very stable chemical properties as the positive electrode material, and lithium metal with very high specific energy as the negative electrode material.

#9-Secondary Lithium

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It is a secondary button battery, and it is also a button battery that can be charged and discharged multiple times; the nominal voltage is 3.7V; the charging voltage is 4.2V.

Battery name Battery type Battery voltage

LR Alkaline 1.5V

SR Silver Oxide 1.55V

CR lithium battery 3V

ZA Zinc Air 1.4V

LIR secondary lithium battery 3.7V

#10-Hammer Button

The battery has the characteristics of high energy density, good storage performance, small self-discharge, and long life. The disadvantage is that the internal resistance of the battery is relatively large. The positive electrode of the battery is made of manganese dioxide or iron disulfide as raw material, the negative electrode is a hammer, and its electrolyte is organic matter. The nominal voltage of Li/MnO type hammer battery is 2.8V, and the nominal voltage of Li(CF)n type hammer battery is 3V.

#11-Solder battery

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Soldered battery, also known as battery with feet, pin battery, English name battery with soldered battery; battery with pins is called PIN battery in Taiwan and Hong Kong.

#12-Button Battery Recycling

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In alkaline batteries, silver oxide batteries, and zinc-air batteries using zinc electrodes, the zinc of the negative electrode can chemically react with the components in the electrolyte, so it will be consumed by corrosion, which will not only reduce the available capacity of the battery, but may also cause damage to the battery. Hydrogen gas is generated, causing the internal pressure of the sealed battery to increase and expand. In order to suppress such effects, a small amount of mercury is usually coated on the surface of zinc, which also causes mercury pollution to the environment caused by discarded batteries. Although mercury-free button batteries are already on the market, due to technical or patent reasons, mercury-free button batteries are not yet popular enough.

Button batteries are not yet within the scope of the mercury-free ban on general dry batteries, and a small amount of mercury is still allowed, and must be recycled according to the instructions of environmental protection agencies.

For more knowledge of button batteries, please continue to pay attention to my blog, and welcome all colleagues to communicate

Carl Zhang

Carl Zhang

I am a senior sales with 15 years in the battery industry and a bachelor's degree in economics.
I will be sharing some of my expertise on batteries and my insights into the battery industry in my blog, which should help you with your purchases in China.

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