What are the effects of fast charging of mobile phone batteries.solar energy storage lithium ion battery 10kwh 48v 100ah

　　Firstly, we need to understand the charging and discharging principles of lithium-ion batteries. Batteries have two poles: the positive electrode is lithium compound, and the negative electrode is graphite.

　　Charging and discharging are the mutual conversion of electrical and chemical energy, and during the movement of lithium ions at the positive and negative poles, they also become different compounds.

　　We can think of lithium ions as small cars loaded with charges: during charging, due to the electric field, all cars are driven to the negative electrode to store a certain amount of energy (lithium ions are embedded in the graphite carbon layer micropores of the negative electrode); During discharge, these charged lithium-ion cars undergo chemical reactions and then run to the positive electrode (the removal of lithium ions causes the positive electrode to be in a lithium-rich state). During this process, a current supply is formed.

　　In an ideal state, as long as the chemical structure of the positive and negative electrode materials remains basically unchanged, the reversibility of battery charging and discharging is good, and lithium-ion batteries can ensure long-term cycling.

　　Fast charging mainly ensures that lithium ions are quickly inserted from the positive electrode and into the negative electrode, without causing the deposition of lithium ions.

　　However, as the current increases, a semi permeable film (SEI film) on the surface of the negative electrode (graphite) will rupture to a certain extent, causing the electrode material and electrolyte to react with each other. In addition, an increase in temperature will also cause side reactions inside the battery to damage the chemical substances on the battery, leading to a decrease in reversibility (that is, the lithium-ion car cannot be driven back and forth), and the battery capacity will continue to decrease.

　　Lithium battery charging is divided into three parts: constant current pre charge (CCPre charge), high current fast charge (CC Fast Charge), and constant voltage charge (CV).

　　After the phone runs out of battery, the voltage decreases. When it falls below a certain value, the charger uses a relatively low current to pre charge the lithium battery. After a period of time, when the voltage of the lithium battery exceeds the predetermined value, it enters the second stage of high current constant current charging. At this time, increasing the current appropriately can accelerate the charging speed.

　　If you are using a non fast charging phone, the fast charging head will not output high voltage to burn your phone. Just like when you charge an iPhone with an iPad charging head, the iPad will automatically recognize and input 1A current instead of the original 2A.

　　From the perspective of numerous protective measures, the charging voltage and current of fast charging are in a safe state, and as long as the original mobile phone charging adapter is used, there will be no safety hazards.

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