18650 battery,18650 battery

The Comprehensive Introduction for 18650 battery cell

18650 battery,18650 battery

Summary

The 18650 numbers in the 18650 lithium battery represent the external dimensions: 18 means a diameter of 18mm, 65 means a length of 65mm, and 0 means a cylindrical battery. It is a standard lithium-ion battery model set by the Japanese SONY company in order to save costs, called 18650 lithium battery.

1. The best 18650 lithium battery pack

The 18650 numbers in the 18650 lithium battery represent the external dimensions: 18 means a diameter of 18mm, 65 means a length of 65mm, and 0 means a cylindrical battery. It is a standard lithium-ion battery model set by the Japanese SONY company in order to save costs, called 18650 lithium battery.

The 18650 lithium battery pack usually includes three parts: 18650 batteries, a protective board (usually called PCBA) and a shell structure. The best 18650 lithium battery pack should choose the best following three components:

1.1 Using high-quality 18650 battery

The best 18650 lithium battery pack should be composed of first-line brand batteries, and the mainstream capacity ranges from 1800mAh to 3500mAh. The single battery has undergone a series of safety tests and performance tests. After years of quality evaluation, the following high-quality batteries are recommended:

18650 batteries of the world’s top brands: SAMSUNG, PANASONIC, LG, SANYO, SONY

Chinese’s first-line brand 18650 batteries: Lishen, BAK, etc.

1.2 Multi-function protection circuit board (PCBA)

The core component of the lithium battery protection board is the protection IC. The main materials of the protection board are PCB, magnetic field effect tube (MOS tube), NTC, PTC, capacitor, resistor, diode, triode, etc.

Overcharge protection: When the voltage of a certain string of the battery pack is greater than (overvoltage) the maximum value and the protection delay is reached, the IC controls the CMOS to turn off the charging circuit.

Over-discharge protection: When the voltage of a certain string of the battery pack is less than (undervoltage) the maximum value and the protection delay is reached, the IC controls the DMOS to turn off the discharge point loop.

Over-current and short-circuit protection: When the output current of the battery pack P+ and P- exceeds the over-current/short-circuit current value and reaches the over-current/short-circuit delay, the control circuit controls the discharge DMOS to turn off the discharge circuit and stop the discharge.

High and low temperature protection: When the temperature sensor reaches the temperature threshold and the protection delay is reached, the control circuit controls to turn off the charge and discharge MOS tube, and stop the charge and discharge.

The lithium battery protection board also has functions such as power detection, remaining capacity display, battery working status display, and communication remote control.

1.3 Housing Component

According to the needs of electrical appliances, design a matching shell structure, usually plastic shell, hardware shell, simple PVC heat shrink, etc.

1.4 Superb lithium battery PACK technology

For the 18650 lithium battery pack, the superb PACK capability is very important. It is necessary to have advanced equipment, skilled technical workers, mature management mode, and rigorous production requirements to ensure that the 18650 lithium battery pack can be welded, tested, and There will be no omissions in important links such as aging and pre-shipment testing, and the best 18650 lithium battery pack will be produced.

Feature

Shockproof and waterproof: through the design of the shockproof structure filled inside the fireproof PC shell, it meets the requirements of high safety and high reliability;

Low temperature work: military-grade low temperature batteries are used to ensure work at a low temperature of -40 degrees.

Reliable connection: using gold-plated to plug gold finger connectors, fast, safe and reliable;

The battery pack is safe, with a temperature probe, which can upload temperature information to the host computer;

Battery pack I2C communication, can upload battery voltage, current, capacity and other parameters to the host computer;

The battery pack has a high cycle life and conforms to the values of low carbon, energy saving and environmental protection;

The best 18650 battery cell model

18650 battery,18650 battery

Choose the most suitable 18650 lithium battery according to our electrical equipment, such as the appropriate brand, voltage, capacity, continuous discharge rate, battery life, etc. The most important thing is to choose a battery with high safety. Below we will launch a detailed introduction one by one:

1. Brand

Regarding brands, there are internationally well-known brands such as Sanyo, Samsung, SONY and LG that are more reliable.

Sanyo and LG focus on conventional applications, and their applications are mainly glare flashlights, power banks, and laptop batteries.

SONY specializes in high-current power. Take VTC4 as an example, the discharge current can reach 30A, electronic cigarettes, toy airplanes, etc., can easily do it.

2. Rated Capacity

The nominal capacity of the 18650 battery is related to the endurance. The unit is “mAh”. The higher the capacity, the stronger the endurance. For example, a 2800mAh battery can be continuously discharged for 2 hours at 1.4A.

3. Continuous discharge current (CDR)

Continuous discharge capacity is expressed by C number, continuous discharge current = continuous discharge capacity C number × capacity.

For example, the capacity of an 18650 battery is 2800mAh, and the continuous discharge capacity is 0.5C, then the continuous discharge current = 1.4A. Discharging over 1.4A for a long time will seriously affect the battery life, and there may be dangers such as overheating, burning, and explosion. 

4. Internal resistance

The internal resistance is the resistance of the battery itself. The smaller the internal resistance, the lower the consumption and the stronger the discharge capacity. The parameter of internal resistance will generally be written on the battery introduction page. Please pay attention to it when buying and try not Buy batteries over 100mΩ.

To use multiple 18650 batteries in series, you must buy batteries of the same brand and model, otherwise batteries with large internal resistance and low capacity will become shortcomings.

5. Temperature

Temperature is a major factor affecting the life of 18650 lithium battery. The higher the temperature, the more the battery will age. The higher the temperature, the greater the internal damage of the battery.

How to avoid buying fake 18650 lithium batteries?

When we buy 18650 lithium batteries, we will inevitably encounter many fake products on the market. How should we avoid buying fake and shoddy products?

1. Choose high-quality suppliers

2. Check the workmanship of the battery. The genuine lithium battery shell is made of special materials, which is very sturdy and tidy in appearance. There are no excess burrs. The outer surface has a certain roughness and feels comfortable, and the inner surface feels smooth.

3. Pay attention to check brand trademarks, product qualification certificates, inspection certificates, etc.

The lithium battery label adopts secondary printing technology. Under certain light, from the side, it is obvious that the color of the barcode part is darker than the rest.

4. The battery performance test must ensure that the battery performance passes the test.

Welcome to make comments or contact me for details. I will try to serve you a whole lithium battery solution.

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