18650 lithium battery parameters and repair methods

18650 lithium battery is a common type of lithium battery. 18650 lithium battery is very suitable for rapid batch automated production. And the safety performance is reliable, widely used in various industries and fields. 18650 lithium battery parameter one; numerical description 18 is the diameter of 18mm, 65 is the height of 65mm, and 0 is the cylindrical battery. Nominal voltage of single cell: 3.6V or 3.7V. Charging voltage: 4.2V (4.2V-4.3V for lithium cobalt oxide) Minimum discharge termination voltage: 2.75V, lower than this voltage will easily lead to a serious drop in battery capacity or even scrap. The most charge termination voltage: 4.20V diameter: 180.2mm. Height: 652.0mm. Capacity: above 1000mAh, the conventional capacity is 2200mAh-3200mAh. Advantages of 18650 lithium battery 1. Large capacity. The capacity of 18650 lithium battery is generally between 1200mah~3600mah, and the general battery capacity is only about 800mah. If combined into a 18650 lithium battery pack, the 18650 lithium battery pack can easily exceed 5000mah. 2. Long life. 3. High safety performance. 18650 lithium battery has high safety performance, non-explosive, non-combustible; non-toxic, non-polluting, and has passed RoHS trademark certification; various safety performances are completed in one go, and the number of cycles is more than 500; high temperature resistance performance, discharge efficiency of 100% under 65 degrees . In order to prevent the battery from short-circuiting, the positive and negative electrodes of the 18650 lithium battery are separated. Therefore, the short-circuit phenomenon may have been reduced to the extreme. A protection board can be installed to avoid overcharge and overdischarge of the battery, which can also extend the service life of the battery. 4. High voltage. The voltages of 18650 lithium batteries are generally 3.6V, 3.8V and 4.2V, which are much higher than the 1.2V voltages of nickel-cadmium and nickel-hydrogen batteries. 5. There is no memory effect. It is not necessary to empty the remaining power before charging, which is convenient to use. 6. Small internal resistance. How to repair 18650 lithium battery, 18650 lithium battery repair method 1) For the repair of 18650 lithium battery whose voltage is between 0.1-2V, this kind of lithium battery belongs to the over-discharged lithium battery. Generally speaking, the lithium battery only has 0.1 There is a high probability of repairing the voltage of V. This situation is also a relatively common one. When the lithium battery cannot be used, we first measure the voltage of the battery. This is a better basis for judging whether the battery is good or bad. If any voltage is measured, there is no need to repair it. Because a short circuit has occurred inside the battery, it is impossible to repair. Note that if the battery voltage is around 2V, you can directly use a normal 18650 lithium battery (the voltage is around 3.6V), connect them in parallel (positive electrode to positive electrode, negative electrode to negative electrode). The low-voltage battery is partially charged and then placed on the 18650 lithium battery charger for normal charging. However, some chargers have their own activation function, which can charge low-voltage batteries. This method is suitable for situations where existing chargers cannot be charged normally. For 18650 lithium batteries with a voltage lower than 1V, especially 0.xV, most chargers will refuse to charge and report an error, or directly fail to charge. Then this kind of battery needs to use a nickel-metal hydride battery charger, use a low current method to charge to more than 1V and then try the above-mentioned parallel connection, here you need to pay attention, the 18650 lithium battery in the 0.xV state should not be directly connected to the normal lithium battery Batteries are forced to be charged in parallel, which may directly fuse the inside of the battery and cause permanent damage to the lithium battery. And this is a high probability situation. 2) Restore the capacity of the 18650 lithium battery; the capacity of the lithium battery can only be restored in a small range. The lithium battery will not have capacity sluggish due to memory problems, so if the repair effect of the capacity failure caused by normal use is most of the time Minimal, but you can also try the operation. Sometimes the effect is surprising. -10℃ refrigeration method; put the used up 18650 lithium battery (voltage about 3.3V) in the refrigerator for a few days before taking it out. Wait for the battery After returning to normal temperature, fully charge it to 4.2V. Repeating several times will help to restore the capacity. 3) When the lithium battery needs to be stored, the voltage of the battery can be used to about 3.6V and then packed in a fresh-keeping bag and stored in the refrigerator. In a low temperature environment, the natural attenuation of the lithium battery will become very slow, so the same is true. In high temperature environments, lithium batteries will accelerate aging. The price of 18650 lithium battery is directly proportional to the capacity. The larger the capacity, the greater the energy ratio and the more raw materials used, so the price will be more expensive. The general price is 10~30 yuan per stick. It should be noted that when purchasing 18650 lithium batteries, in addition to capacity, discharge performance is also critical. It is necessary to use 18650 lithium batteries for different devices according to the discharge performance. On some high-power devices, the 18650 has better discharge performance. The state of use of lithium batteries will be better. In some low-power devices, the capacity type 18650 lithium battery can provide longer standby time. The above is a summary of the parameters of the 18650 lithium battery. The 18650 is only a commonly used size model of the battery. In fact, other types of battery products still have the 18650 battery model. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What caused the explosion of the 12V lithium ion battery and the fire