Comprendre le voltage du 18650 : Tout ce qu'il faut savoir

Faits marquants

• Nominal Voltage: Most 18650 lithium batteries have a nominal voltage of about 3.7 volts.
• Voltage Range: The voltage on these batteries can get as low as 2.5 volts when you use them often, and go up to 4.2 volts when you charge them all the way.
• Charging Practices: Charging them above 4.2 volts is not good for the battery. If you overcharge, it can hurt the battery. This kind of damage can not be fixed.
• Chemistry Variation: There are various types of lithium batteries. Some, such as LiFePO4 and LiCoO2, contain different materials inside. This can lead to differences in nominal voltage and battery performance.

Understanding 18650 Battery Voltage

The 18650 battery is a round lithium battery. It has a diameter of 18 mm and a height of 65 mm. The voltage of the battery is important. Voltage helps you know how well the battery can work. The voltage also tells you if the battery will fit in your devices.

Nominal Voltage Explained

The term nominal voltage is used to talk about the usual amount of voltage you get from a lithium battery. A regular 18650 lithium battery gives about 3.7 volts when you use it. This is the level of voltage you will get when the battery is not full and not empty.

Nominal voltage is set by what is in the battery. The anode and cathode, and the things they are made from, help to pick the voltage. For example, when a battery uses lithium cobalt oxide, the nominal voltage is often 3.7 volts. If the battery is made with lithium-iron phosphate, it will give about 3.2 volts.

Charging and Discharging Voltage Limits

The voltage you use when charging or discharging Batteries 18650 is very important if you want to keep them safe and working well. When you charge this battery, the highest voltage should be 4.2 volts for each cell. At this point, the battery is full. If you go above 4.2 volts, you risk overcharging. This can cause irreversible damage, make problems in the battery’s liquid, or even cause the cell to swell.

On the lower side, you should not let the voltage of your lithium battery drop below 2.5 to 3.0 volts. If it goes lower than that, there is a chance of discharging it too much. This will lower the cycle life of your battery, and it will not keep as much power over time. By charging and discharging between these safe voltage levels, you help your battery have a longer cycle life. It will also work better, even after a lot of use.

18650 Volts Chart and Range

Typical Voltage Ranges for Different Chemistries

Different materials used in 18650 batteries can change the voltage and how the batteries work. Take a look at the table below to see the differences:

The kind of lithium chemistry inside a battery changes a few important things. It changes the nominal voltage, how much you can charge it, and the lowest safe point you can let the voltage go when you discharge it. Because of the differences between lithium batteries, every battery is good for some uses. A few work well in power tools. Some are good for electric vehicles. A few are best for the devices that you use every day.

Voltage vs. Capacity Relationship

Voltage and battery capacity go hand in hand. This helps you see how good and strong 18650 cells can be. When you use the battery, it will start to discharge. As the battery discharges, the voltage goes down. When you notice this drop in voltage, it is a good sign to know how much power is left in the battery.

For example, when the battery is all charged, the open-circuit voltage is at 4.2 volts. But as the battery gets close to 10%, the voltage drops to 3.68 volts. This shows it is time to charge it again. These changes in voltage are also connected to the cycle life and how much the battery is used. If you keep the battery in the best voltage range, it will last longer.

If you do not let the battery go empty or charge it too much, the voltage stays steady. This helps with the cycle life of the battery. You can use a voltage checker to see the voltage at any time. This way, you can watch it and plan to use the battery for a longer time.

Factors Affecting 18650 Voltage

Impact of Temperature and Load

Temperature can change how voltage works. When the temperature is high, a battery runs chemical reactions better, so the voltage may go up a bit. But if it is cold, these reactions slow down. This makes the voltage go down. To help your battery work well and last longer, try to keep it between 20° and 25°C.

The load can change how voltage works. If you have a heavy load, it takes up energy fast. This makes the voltage drop quicker. When you keep the load light, the voltage stays steady for longer. The discharge will also last longer.

Role of Charging Practices and Storage Conditions

Proper charging and the right storage help keep the voltage of the battery steady. They also stop irreversible damage from happening as time goes by. If you want your battery to last longer, you can follow these steps.

• Recharge Promptly: Always charge the battery before its voltage goes below 3.0 volts. This will keep it safe and stop over-discharging.
• Éviter la surcharge : Do not let the battery go over 4.2 volts when charging. Overcharging can cause problems with chemicals in the battery or make it swell.
• Optimize Storage Voltage: Store the batteries at around 3.6 or 3.7 volts. This can keep self-discharge low and help the cycle life last longer.
• Cool, Dry Storage: Keep batteries in a cool and dry area. This helps keep the voltage from going too high or too low because of heat or moisture.

If you follow these steps, you will get better at your job anywhere you use 18650 batteries.

What is the 18650 Battery Low Voltage and How to Prevent It?

Low voltage is when an Batterie 18650 drops below 3.0 volts. When the voltage gets this low, you should not keep taking more discharge from the battery. If you keep using the battery at this point, it can do damage that you can not fix.

To stop the voltage from dropping too low, you can use voltage alarms and lithium checkers. These tools let you know about a problem early. A lot of BMS systems can stop discharging the battery when it is under a safe level. The BMS does this by itself. This will help your battery last longer and keep it working well.

When you start charging your batteries right after you use them, and you keep the right load on, you help the voltage stay steady. If you do this, your battery will not get damaged as easily.

Why Choose PKCELL for Your 18650 Lithium Battery Needs?

For businesses that need trusted 18650 batteries, PKCELL is the right place to be. We have over 20 years of experience in the industry, and we know how to make good lithium 18650 batteries. These are used in many areas like energy storage systems, power tools, and electric vehicles. Our 18650 batteries are known for their good energy density and long cycle life. They also give steady and reliable performance. At PKCELL, we use strict checks to make sure the quality stays high. We follow global standards such as ISO9001, CE, and RoHS for good safety and performance. We focus on business-to-business needs. Get in touch with us today and ask for a quote!

Conclusion

Knowing the voltage of 18650 batteries helps you get good performance and longer life from the battery. It is important to know about things like nominal voltage, charging, and what you should watch for. The temperature and the load can change the voltage, so you have to be careful about that. Keep an eye on the voltage levels to stop problems like over-discharge. Over-discharging can hurt the battery and make it less safe to use. If you have questions about which battery to get or about charging and discharging, feel free to get in touch with us.

Questions fréquemment posées

What happens if an 18650 battery is over-discharged?

When you let a battery’s volts drop too low, like to 2.5 volts, it can have irreversible damage. The inside of the battery can break down, or it might get more resistance. A BMS, or Battery Management System, helps stop this kind of damage. It looks at the discharge cycles and keeps the battery from going too low before it gets hurt.

Why does the voltage drop under heavy loads?

Voltage drops when there is a heavy load. This happens because the need for energy goes up. The battery’s resistance also changes at this time. These things can make the battery less stable. This is something you may see with battery packs that get used often or when the temperature goes up and down. Voltage is affected every time there is a discharge.

How do you safely measure the voltage of an 18650 battery?

To safely measure the 18650 voltage, use a digital multimeter. Set it to measure DC voltage, then connect the positive probe to the battery’s positive terminal and the negative probe to the negative terminal. Ensure proper contact for an accurate reading while avoiding short circuits or contact with conductive materials.