18650 lithium battery repair principle and method

Generally 18650 lithium batteries are increased in parallel by parallel. For example, the 20000mah mobile power supply is generally composed of 8 2600mah batteries or 6 3400mah 18650 batteries. Parallel adds 3.7V capacity. Then increase the voltage by series, 2 series is 3.7 * 2 = 7.4V, three 12.6V analogy.

How to repair 18650 lithium battery.

2. Usually, electric vehicles and laptop batteries need to increase the battery voltage to 12V or 36V48v72V through multiple batteries in series. At this time, if the capacity or quality of the battery is not equal, there is always a loss in the use process. Like the short board principle of a wooden barrel, a battery or a group of batteries connected in parallel affects the total battery voltage and capacity of the entire battery pack.

How to repair 18650 lithium battery

3. The impact is that, for example, notebooks are generally 2 and 3 strings, which constitute a battery from 10.8V to 12.6V. A group of two parallel batteries will be depleted first, which will cause the whole battery to have a reduced capacity. Specifically, the battery has a short standby time, a fast charging speed, and fast power consumption. The same is true for electric vehicles and other equipment.

How to repair 18650 lithium battery

4. At this time, it is necessary to replace the battery pack and avoid the barrel effect (short board principle - the barrel can hold water depending on the shortest board of the barrel). This will allow the battery to be used evenly and extended.

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18650 battery wear detection

1. Battery wear performance, battery voltage does not go up, and capacity is low.

How to repair 18650 lithium battery

2. Directly measure with a voltmeter if the voltage across the 18650 battery is below 2.7V or no voltage, indicates that the battery or battery pack is damaged. The normal voltage is 3.0V~4.2V (the general 3.0V battery will be cut off, the 4.2V battery voltage will be fully charged, and the individual types will also be 4.35V)

3. The battery voltage is lower than 2.7V. You can charge the battery with the charger (4.2V). After 10 minutes, if the battery voltage rises, you can continue charging until the charger is full then look at the full voltage.

If the full voltage is 4.2V, the battery is normal. It should be that the last time the power consumption was too much and the battery was cut off.

If the full voltage is much lower than 4.2V, it means the battery is damaged. If it is a battery that has been used for a long time, it can be judged that the battery life is up and the capacity is basically exhausted. It should be replaced. Basically there is no way to fix it. After all, lithium batteries have a long life, not unlimited.

4. If the battery is measured, there is no voltage in the battery. There are two situations at this time. One is that the battery is good, and the battery is stored for a long time. This battery has a certain chance to recover. Generally, the battery is activated by a lithium battery pulse activation device time to charge multiple times. It is possible to fix it. Generally, the cost of repair is not low or buy a new one.

Another possibility is that the battery is completely worn out, the battery diaphragm breaks down, and the positive and negative poles are short-circuited. There is no way to fix this kind of thing, can only buy new ones.

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Lithium battery pack repair

1. As mentioned earlier, lithium battery packs should often be used because one or a group of batteries is damaged. At this time, the voltage across each battery should be measured one by one, and the voltage or voltage should be severely low (the previous one is described). Come out and replace the new one with the same kind of internal resistance.

How to repair 18650 lithium battery

2. After the general replacement, the lithium battery pack can still be used up to the other battery life loss. This partial replacement is generally less expensive. It is also a commonly used method on the market.

3. Lithium battery must be equipped with a protective plate to limit overcharge, over discharge, short circuit, etc., which is beneficial to extend the life of the lithium battery pack.

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Precautions

Lithium battery cannot be short-circuited the inspection must pay attention to

18650 lithium batteries must be used with protective board

Lithium battery charging must not exceed the rated voltage and current, as well as charging time

Lithium battery chargers must have quality assurance to extend service life

1. Take all your batteries and use them after temperature treatment. The battery will greatly shorten the use time when the temperature is unstable, because the battery is not charged and a considerable part of the lithium ions have been used for memory. This method can make a part of the memory power release, winter is over, put it outside for a while, then go to the house.

2, there is a way to remove the battery, put it for about a week, the electricity will be slowly consumed you need to use the machine to completely consume the electricity. Then fully rush, it is estimated that your current charging time must be very short, after the full, disconnected and rushed, repeated several times, absolutely effective.

The page contains the contents of the machine translation.