In general, the lithium polymer battery life is determined at the moment the battery is made into a finished product. The life of the battery is determined by the specific characteristics of its materials and structures. As we know, the battery life is calculated based on the material and structure. For theoretical life, but the working lithium polymer battery often shows the actual life, usually less than the theoretical life. The extent to which the actual lifetime does not reach the theoretical lifetime is due to the non-working loss of capacity.
This non-working loss is affected by the following factors:
1. The side reaction of lithium polymer battery,
2. Irreversible consumption of active substances in lithium ion polymer batteries,
3. For large-scale lithium-ion batteries, the battery has a large operating current and slow heat dissipation, which easily causes damage to the battery structure.
4. If the lithium polymer battery is added with safety protection measures, it needs to be maintained by the power provided by the battery.
The loss of battery capacity is manifested during the charging, discharging and self-discharging of lithium polymer batteries:
1. As the number of cycles increases, the charging time decreases. The charging platform of the lithium battery is 3.7V~4.2V. At this stage, the charging capacity accounts for more than 90% of the total charging capacity. As the number of cycles increases, the voltage rising speed increases and the charging capacity decreases.
2. The discharge platform of the lithium polymer battery is in the range of 4.1V~3.7V. At this stage, the discharge capacity accounts for more than 90% of the total capacity. As the number of cycles increases, the discharge platform of the lithium battery decreases, and the discharge capacity also decreases.
3. The ratio of the self-discharge of the lithium ion polymer battery to the total power of the lithium battery increases as the number of cycles increases, but the lithium battery discharge platform is accelerated.
The reduction in the lifespan of lithium polymer batteries is characterized by capacity decline. All lithium polymer battery manufacturers knows that the life of lithium ion batteries is limited. This is the same as the development of anything. Capacity decline is a manifestation of quantitative change to qualitative change. It can be seen from this performance that the method of extending the life of the lithium battery is undoubtedly considered from the viewpoint of scientific charge and discharge and reduction of self-discharge, and the loss during use directly affects the life of the lithium polymer battery.
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