There is a lot of content about 18650 lithium battery repair, but there are probably not many that actually work. Most of the articles are not detailed description of 18650 lithium battery repair, in fact, 18650 lithium battery repair is not difficult, but to restore the original state which is impossible, but can make its capacity to restore part of the 18650 lithium battery, or will not be able to use the 18650 lithium battery back to a usable state is not difficult.
18650 lithium battery repair before we need to prepare a multimeter, a single 18650 lithium battery charger can be charged, a NiMH battery charger (non-intelligent charge, if the intelligent charge, with 0V activation function is the best), a normal body of 18650 lithium battery.
18650 lithium battery monoblock is used more. Strong flashlight, handheld mobile fan, rechargeable batteries, some radios, etc., many small appliances in life are used to 18650 lithium battery, the content of this article is only suitable for the repair of 18650 lithium battery used in this type of single unit. For the group of 18650 lithium battery group is not suitable.
18650 lithium battery repair methods.
(1) for the voltage has been between 0.1-2V 18650 lithium battery repair, this lithium battery belongs to the lithium battery over discharge, in general, lithium batteries as long as there is 0.1V voltage has a high probability of repair, this situation is also a relatively common, when the lithium battery can not be used, we first measure the battery voltage, so it is better to determine whether the battery is good or bad basis, if has not been able to measure any voltage, then there is no need to repair. It is impossible to repair the battery because it has been short-circuited inside.
Repair low battery 18650 need to pay attention to, if the battery voltage is about 2V, you can directly use the normal body of 18650 lithium batteries (voltage of about 3.6V can be), they are connected in parallel (positive to positive, negative to negative), forced to the low voltage battery charge part of the charge and then immediately put on the 18650 lithium battery charger normal charging can be. However, there are some chargers with their own activation function, it is possible to charge the low voltage battery up, this method is applicable to the existing charger can not be charged properly.
For lower than 1V, especially only 0.xV of this 18650 lithium battery, most chargers will refuse to charge the error, or directly unable to charge. Then this kind of battery needs to use the NiMH battery charger, use the low current charge to more than 1V and then try the above-mentioned parallel connection, here you need to note that the 0.xV state of 18650 lithium battery do not directly parallel with the normal lithium battery forced charging, which may directly fuse the internal battery, resulting in permanent damage to the lithium battery. And this is a probable situation.
(2) restore the capacity of 18650 lithium battery; capacity recovery of lithium batteries can only be small, lithium batteries do not have a dull capacity because of memory problems, so if the repair effect of capacity failure caused by normal use is minimal most of the time, but you can also try to operate, sometimes the effect will be a surprise, -10 ℃ refrigeration method; will run out of power 18650 lithium battery (voltage 3.3V or so) into the refrigerator for a few days and then take it out, after the battery to return to room temperature will be fully charged to 4.2V, repeat several times to help restore the capacity.
3) When the lithium battery needs to be stored, you can use the voltage of the battery to about 3.6V and then use the fresh bag into the refrigerator for storage, in the low temperature environment, the natural decay of lithium batteries will become very slow, then by the same token, in the high temperature environment, lithium batteries will accelerate aging.
To sum up; 18650 lithium battery repair is actually very easy, as long as the standard operation can be successfully repaired, 18650 lithium battery safety and technical maturity has been very good. When the battery has some small failures repair is still very necessary. Shenzhen Ruiding Electronics Co., Ltd. is a professional 18650 lithium battery PACK manufacturer with strong technical strength.
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