How do "dead" lithium batteries come back to life?

Lithium battery is now widely used, but the price of lithium battery is not cheap, how to save the cost, not only can the battery recycling, cascade utilization, but also can let the "dead" lithium battery life, that is to say, in many cases, lithium battery scrap is just a kind of "fake death".

The suspended death of lithium batteries is generally divided into three cases.

First, the battery is not charged at all, the charger and the appliance are not recognized, and the electrode has no voltage.

Second, the battery can be charged, chargers, electrical appliances can also be identified, but only for a few minutes, the power is quickly exhausted.

Third, it can be charged, and the capacity is still sufficient, but the large current discharge voltage drops significantly (for example, the camera shooting mode can only last for a few minutes, and the look back mode can last for a long time)

Take the following two batteries

Lithium battery lithium ion battery

The battery seems to be "dead", but there is also a high probability that it can be saved, charging the battery with a DC that is equal to the battery design voltage.

This kind of "dead" battery, with the original charger is not charged, no current at all. However, charging the battery with a DC power equal to the battery design voltage will result in a relatively large current, and this charging current will slowly decrease, approaching zero after a few minutes. This is good news: the battery voltage is returning to the design level.

At this time, stop charging, and then use a multimeter to measure the two poles of the battery, is there a normal voltage? Then you can charge it with your original charger.

Some users have used this method to repair a lot of batteries, and many of them can recover to about half of the design capacity.

But this is not enough. In order to completely activate the battery, it needs to be fully charged and discharged several times.

The discharge circuit is composed of a resistor and a light emitting diode, and the state of the discharge can be estimated by the light emitting diode.

This worked well for the first type of battery. In the latter case, the battery is hard to fix. Lithium batteries that cannot be repaired can be reasonably recycled or reused as waste batteries. Such high-cost batteries are a pity to be discarded.

The page contains the contents of the machine translation.