How to calculate the power consumed when charging a lithium battery?

Introduction How to calculate the power consumed when charging a lithium battery? Your battery is not 1000 mAh but 1000 mAh. For a battery of this capacity, if you use 1000ma=1A

How to calculate the power consumed when charging a lithium battery?

Your battery is not 1000 mAh but 1000 mAh. If a battery of this capacity is charged with a current of 1000 mA = 1 A, the charging voltage is 4.2 V and it takes 1 hour to fully charge. In this way, the power consumed is 1 (amp) × 4.2 (volt) ×. 1 (hour) = 4.2 watt hours = 0.0042 kilowatt hours = 0.0042 degrees

#battery#charge#current#voltage#capacity#electric energy

How to calculate the charge cycle of lithium battery

First of all: battery capacity is something that cannot be changed by the battery (certain), which is C (you define The unknown).

Second: The formula for charging time is T=C (battery capacity mAh)/A (charger current mA)

In the information you got, you got nothing in the formula There is no solution for a quantity that involves two unknowns.

None of the conditions you know aboutez has no fundamental relationship to the quantity you want to obtain, and they cannot be estimated. . .

Equivalent to When charging the device, the current is 900 mA. How long will it take to fully charge? Is there a calculation method?

As we all know, one of the advantages of lithium batteries is that they can be charged at any time and at a convenient time, instead of having to recharge after a power outage. So, what is a charge cycle? A charge cycle means that all of the battery's energy is used from full to empty, then charged from empty to full. This is not the same as a single charge. To put it simply, for a 600 mAh lithium battery, you charge it from 0 mAh to 400 mAh for the first time, and use N milliamps; then you charge it to 150 mAh, then use N milliamps to charge 100 A; mA When the last charge reaches 50 mA, one cycleThe charging of this battery is complete. (400+150+50=600) Steps/Methods A lithium battery only used half its power on the first day, then fully charged it. If it is still the same the next day, i.e. if you charge it half and charge it twice in total, this can only be counted as one charging cycle and not two. Therefore, multiple charges may often be required to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. This is why many people who use lithium battery cell phones often say: "This broken cell phone can be used for 4 days when I first bought it, but now it can only be used for 3 and a half days on a single charge. However, this power reduction is very small. High quality batteries still retain 80% oftheir original power after being charged for many cycles. Many lithium-powered products are still used as usual after two or three years. Of course, lithium batteries will eventually need to be replaced once their lifespan has expired. The lifespan of lithium batteries is generally 300 to 500 charge cycles. Assuming that the power provided by a full discharge is 1Q, if each charge cycle is not considered, With the power reduction, the lithium battery can provide or supplement a total of 300Q to 500Q of power to the during its lifespan. From this we know that if you charge 1/2 each time, you can charge it 600-1000 times; if you charge it 1/3 each time, you can charge it 900-1500 times. By analogy, if it is charged randomly, the number of times is uncertain. In short, no matter how you charge it, the total amount ofadded electricity is 300Q to 500Q, which is constant. Therefore, we can also understand this: the lifespan of a lithium battery is related to the total charging capacity of the battery, and has nothing to do with the number of charging times. There is little difference in the impact of deep discharge, deep charge and shallow discharge on the life of lithium batteries. Well, some MP3 manufacturers claim in their propaganda: “A certain model of MP3 uses a powerful lithium battery that can be recharged more than 1,500 times. » This is only to deceive consumers and lead them to ignorance. In fact, shallow discharge and shallow charge are more beneficial for lithium batteries. Deep discharge and deep charge are only necessary when the product's power module is calibrated for lithium batteries. Therefore, food productsented by lithium batteries do not necessarily have to stick to the process. Everything is done with convenience in mind. You can charge them at any time without worrying about affecting their lifespan.

How to calculate the charge and discharge of a lithium iron phosphate battery and how to calculate a full cycle charge

Battery capacity is usually expressed in mAH or AH< /p>

Battery storage energy is equal to voltage times capacity

General lithium batteries are 3.7V, calculated based on your 3000mA

The total battery capacity is approximately 3.7 x 3 = 11.1 WH.

Charging For a charger with a current of 900 mA, the voltage is usually 4.2 V

The charging time is therefore equal to the battery energy divided by the charging power'

That is to say t=11.1/(4.2*0.9)=3 hours.

Let's take the example of a 48V100AH ​​battery:

The currentnt charging is 20A, i.e. full charging time is 5 hours, divide the battery capacity by; the current to obtain the charging time.

Discharge hypothesis: the power at the load end is 500 W

That is: 500 W (power at the load end) / 48 V (voltage rated) = 10.42A (current)

100AH ​​​​(Battery capacity) / 10.42A (current) = 9.6 hours (working time)

According to battery standards, charging when the power is less than 20% is A-cycle charging. Full-cycle charging refers to a battery. After using 0%, recharge to 100%.

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