How many times does the lithium battery charge-industry-news

Batteries from regular manufacturers can generally be charged and discharged at least 500 times, and the capacity is maintained at more than 80 % of the initial capacity. One charge per day can be used for 2 years.

Poor batteries are estimated to be only about 100 times, that is, about 3 months.

"500 lifetimes" refers to experimental data obtained according to industry standards, specifically the number of times the battery doubling rate is fully charged and discharged, and the battery capacity is reduced by 10 %. Since lithium batteries do not have memory effects and protective circuits, they can not be discharged every time they are actually used. When lithium batteries are charged after using 50 % of their capacity, the battery life can reach more than 1600 times. Of course, this has a lot to do with the quality and value of the battery. Actually all batteries are afraid of deep discharge.

There are many factors that affect the capacity of lithium batteries. The use temperature, charging and discharging current, charging and discharging cut-off voltage and other factors will affect the decline and fall speed of lithium ion batteries. The mechanism that causes the decline of lithium battery capacity can be divided into three categories: internal resistance and polarization increase, positive and negative polar active material loss, and Li loss.

The influence of different external factors on these three is also different. Lithium batteries of LiFePO4 materials, for example, have very good cyclic properties, but different operating conditions have an important impact on the cycle life of lithium batteries. The results show that the two discharge systems have different effects on the 26650 lithium battery. The 26650 lithium battery capacity of 15C pulse discharge decays very fast. After 40 discharges, 15C discharge can no longer be performed, but 1C discharge can still be performed. The 15C continuous discharge battery capacity decays slowly, and 15C discharge can still be performed after 60 times, but the 1C multiple rate decays faster than the 15C pulse discharge.

The mechanism analysis concluded that: The 15C pulsed discharge battery has more LiF in the negative SEI membrane, and the LiF has greater obstacles to the diffusion of lithium ions, resulting in a rapid increase in the Li + diffusion impedance and charge exchange impedance of the battery. As a result, the polarization voltage of the battery is too large during the charging and discharging process, resulting in a rapid decline in the discharge capacity of LiFePO4.

Lithium-ion battery charging strategy for Li-ion battery lifetime decline of the impact of research can better guide our design of Li-ion battery. The effects of different charging control strategies on the life decline of lithium-ion batteries are studied below. The life decline model of lithium-ion batteries is proposed. Studies have shown that when the charging current and cut-off voltage exceed a certain value, the decline of lithium ion batteries will be greatly accelerated. In order to reduce the decay rate of lithium ion batteries, different systems need to be targeted. Appropriate charge and discharge currents and cut-off voltages need to be selected.

From the data, it can be seen that with the increase of the doubling rate of charging, the decay rate of lithium-ion batteries is also increasing rapidly, and from the slope of the curve, there are three different stages of decline and decline speed of batteries. The stage of rapid decline in the early stage(stage 1), the stabilization stage with a slower decline in the middle(stage 2), and the later stage of decline rate acceleration(stage 3). According to the study of the decline and fall mechanism of the three-stage battery, stage 1 may be due to the fact that the growth of the battery SEI membrane requires the consumption of part of Li +, so the decay rate is faster. In phase 2, with the stability of the SEI membrane structure and the stability of the interior, the decay rate is slow. In phase 3, as the battery ages, it begins to lose active substances and the electrode active interface decreases, resulting in the battery being very sensitive to current. Figure C is an experiment aimed at the effect of different cut-off voltage on the speed of battery decline. From the experimental results, it can be seen that when the charging cut-off voltage is increased to 4.3 V, the battery's cycling performance will deteriorate dramatically. Reducing the charging cut-off voltage can effectively improve the cycle performance of the battery.

What are the effects of increasing lithium battery doubling on battery performance?

When the charging current is less than 1C, the dynamic internal resistance of the battery is almost the same as the changing trend of the battery cycle, but when the charging current exceeds 1C, the dynamic internal resistance of the battery increases rapidly as the charging rate increases. From the test results of Figure B, when the charging cut-off voltage is 4.3 V, the dynamic internal resistance increase of the battery is very rapid to indicate that the high cut-off voltage will worsen the dynamic conditions of the battery, and the dynamic internal resistance increase of the battery when the cutoff voltage is 4.1 V and 4.2 V. Slow.

From the above analysis, we can note that there is a value for both the charging current and the charging off voltage. When the charging current or voltage exceeds this value, it will cause the battery decay acceleration. For the above batteries, the value is 1C and 4.2 V. When the charging current and cutoff voltage exceed this value, the decline of the battery will be accelerated. When it is less than this value, increasing the charging current and cutoff voltage will not significantly increase the decline rate of the battery. Studies on the mechanism of the effect of charging current and cut-off voltage on the decline rate of the battery show that when the charging current is lower than 1C, the main effect is the loss of positive and negative active substances, while the effect of cutoff voltage is lower than 4.2 V. Li loss, When the charging current and cut-off voltage are higher than this value, the loss of positive and negative polar active substances and Li losses are significantly accelerated.

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