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3) Discharge characteristics

The discharge characteristics of lithium-ion batteries show a downward trend after long-term storage. The low-temperature performance of batteries stored for a long time significantly decreases.

In summary, the comprehensive characteristics of lithium-ion batteries show a significant downward trend after long-term storage. To reduce the negative impact of long-term storage on various aspects of battery performance, the following aspects should be controlled:

New products that have never been used before: Under normal circumstances, the national standard charged capacity of lithium-ion battery packs is 30% when they leave the factory. For example, a 18650 battery pack with a capacity of 14.8V/2200MAH has a factory power of approximately 600-700MAH. But the cells of lithium-ion battery packs will discharge themselves, which is commonly known as leakage.

There are many electronic components on the protection board of the battery pack, such as ICs, MOS, capacitors, resistors, etc. They also continuously consume electricity themselves, and in addition, the battery cells themselves self discharge (all rechargeable batteries have the same amount, including lithium-ion batteries, polymer batteries, lithium iron phosphate batteries, and nickel hydrogen batteries). Although these self discharge capacities are very small, such as tens of microamperes per hour, the number of calls during normal use can be ignored, But if not used for a long time, even if calculated carefully, it is not small. A few tens of microamperes per hour may reach 1-2 milliamperes.

In this case, taking the 14.8V/2200MAH battery as an example, about 30% of the 600-700MAH battery left the factory has completely leaked out in just over a year. If the battery is assembled on the product, combined with some electronic components on the product, it may leak out faster and in a shorter time. When the battery of the lithium-ion battery pack is completely exposed, the separator paper of the battery cell is completely dry, and the electrolyte is completely zero, it cannot be activated and cannot be recharged. Some customers may say that it is much better to fully charge the battery when you leave the factory. Regarding this issue, it is indeed much better. However, if the factory is fully charged, it is very unsafe. Therefore, the industry standard is that everyone is charged 30%.

Used: When the battery pack is discharged and placed under protection, it is in a state where the battery is basically discharged (in fact, there is only a little residual power). Under normal use, when the lithium-ion battery pack is discharged to the protection voltage, the protection board automatically closes. At this time, the lithium-ion battery pack is close to running out of battery, with only about 5% of the remaining electricity. Under normal circumstances, it will be charged when it is used up. Sometimes, it is too busy to remember to recharge after a few days, and it is not a problem to recharge after half a month. But if it is left unused for three to four months without charging, it will be almost scrapped.

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