What is the cause of lithium-ion battery life?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

The life of lithium-ion battery is subject to two aspects, one is external use conditions, one is the factor of internal cells. From external use conditions, the factors affecting the life of lithium-ion batteries are tightly including charge and discharge, charge and discharge, charge and discharge, charge and discharge ratio, temperature and shelving conditions. From the internal core factors, the use of lithium-ion batteries on a ride is often in the form of a battery pack.

The battery pack is generally parallel to hundreds of cells, and monomer consistency is another life. Important factor. It is necessary to behave as inconsistencies of parameters such as voltage, capacity, internal resistance.

Battery external use conditions affect the life of lithium ion battery life charge and discharge: currently in terms of the research of charging methods, mostly based on Massen, that is, let charging currents as the best charging curve of the Mars theory Do not cause damage to the battery. Some researchers have a comprehensive comparison of common charging methods, discovering that constant current constant pressure charging and ladder constant current charging method overcomes the disadvantages of constant current charging and constant voltage charging, which is the lowest in battery damage. widely used.

Charge and discharge ratio, charge and discharge cutout voltage: Different charge and discharge rate, the lithium ion battery loop is different, the lithium-ion battery capacity attenuation loss rate is different. After changing the discharge cutting voltage, the structure of the electrode material also changed through the detection. The change in the structure of the positive material and the negative surface film thickening can cause a reduction in lithium ions and the diffusion channel blocking, thereby causing battery capacity attenuation.

Using temperature: Different lithium-ion batteries have different optimal use temperatures, high or too low temperatures affect the life of the battery. Research statement, the capacity atmospheric at room temperature is slow, and under high temperature conditions at 55 ¡ã C and 65 ¡ã C, the battery exhibits a rapid failure behavior. When the temperature is below -10 ¡ã C, the capacity of the battery has a sharp decay, and at the same time, the performance of the lithium ion battery will also be deteriorated, which is related to the ion conductivity of the electrolyte and the electrode material.

Shelving conditions: Lithium-ion batteries will occur in the case of the battery itself, the nature of the battery is passivated, and the electrolytic solution analysis and the like will occur due to the nature of the battery itself. The negative electrode SEi performance is unstable to cause rapid decline of negative electrode active materials, and it is prone to lithium metal precipitation, and different electrolyte components have different degrees of decline in electrode materials. Inactive cell monomer inconsistency on the inconsistency of the lithium-ion battery life, it is inconsistent with the parameters such as voltage, capacity, internal resistance.

Inconsistent monomer battery strings are used together, the life of the battery pack will never be less than the life of the shortest life. Similar to the principle of wooden bucket, the life of the battery pack, is determined by the shortest life. Very probably, the shortest life, the battery, that is, the battery is small.

Small capacity battery, every time it is full of overflow, excessive, very large to the end of life. A monomer battery life ends, a set of battery packs that are welded together, just follow the life of lif.

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