Lithium-ion battery life is related to the number of charge cycles completed, and has no direct relationship with the number of charges. Lithium-ion battery life is 500-1000 times, refers to not the number of charges, but a charge and discharge cycle.

A charging cycle means that all the power of the battery is used from full to empty, and then from empty to full, which is not the same as a charge. For example, a lithium battery uses only half its power on the first day, and then it is fully charged. If the next day is still so, use half of the charge, a total of two charges down, this can only be counted as a charging cycle, not two. Therefore, it may usually take several recharges to complete a cycle. After each charging cycle, the battery capacity is reduced a little. However, this reduction in power is very small, high-quality batteries will retain 80% of their original capacity after multiple cycles, and many battery-powered products are still used as usual after two or three years.

Of course, lithium-ion battery life is still to be replaced at the end of the day. The so-called 500 times means that the manufacturer has reached 500 charging cycles. Due to the various effects of real life, especially the depth of discharge when charging is not constant, 500 charge cycles can only be used as a reference battery life.

Therefore, we can also understand that lithium-ion battery life is related to the total charge of the battery, and has nothing to do with the number of charges. There is little difference between deep discharge and shallow discharge and shallow charge on the life of lithium battery. In fact, shallow discharge and shallow charge are more beneficial to lithium, and only when the power module of the product is calibrated for lithium, it is necessary to deep discharge and deep charge. Therefore, the use of lithium-ion battery powered products do not have to adhere to the process, all to convenience first, charge at any time, do not worry about affecting the life.

How long is the lithium-ion battery warranty period:

According to the official data of BMW i3, the comprehensive maintenance cost of an i3 is equivalent to a reduction of 20-45% of the transmission model. If each unit in the battery pack fails, it can be broken down and replaced separately. The vehicle quality assurance cycle of BMW i3 in China is the same as that of other BMW models, that is, 3 years or 100,000 kilometers (subject to the first arrival), battery, motor and other core parts, BMW supply warranty period is 8 years or 100,000 kilometers (subject to the first arrival).

Denza 4S store said that Denza used lithium ion iron phosphate battery performance is excellent, after the test test of Denza, can ensure that after 4000 times of charge and discharge to save 80% of the battery capacity, this result and BYD 4S store given E6 battery performance coincides, which also shows the intrinsic relationship between the two. Denza officially promises to provide the owner with a 3-year or 80,000 km warranty for the vehicle, while the battery is a 6-year or 150,000 km warranty, and the key parts are a 5-year or 100,000 km warranty service; Denza charging cabinet 2-year warranty service.

According to the sales staff of BAIC new energy 4S store, the SK ternary lithium-ion battery used in EV200 has a long life, the battery is fully charged and discharged more than 3,000 times, and the battery capacity attenuation rate is less than 15%, which can be used by users for 10 years. At the same time, BAIC New Energy will supply the core components of all vehicles (batteries, motors, vehicle controllers, etc.) for 6 years / 150,000 km warranty, non-operating vehicle vehicle warranty for 3 years or 80,000 km, and all new energy vehicles are provided free of charge for the first 4 maintenance.

According to BYD 4S shop sales staff, BYD official supply of 5 years or 100,000 kilometers of battery warranty policy, BYD e6 pioneer used in the lithium-ion battery after repeated charging 4000 times, still has 80% capacitance, battery life of about 1.2 million kilometers. In addition, the new energy vehicle e6 pioneer, Qin, non-operating vehicle complete vehicle repair period is 6 years or 150,000 kilometers, and the power lithium battery cell lifetime warranty.