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What is the charging current of the lithium-ion battery? Principle of Li-ion battery charging. The basic requirement for lithium-ion battery charging is a specific charging current and charging voltage to ensure the safe charging of the battery. The charging method of lithium ion battery is to limit the voltage and constant current, which is controlled by the IC chip.
What is the charging current of the lithium-ion battery?
The maximum acceptable charging current for lithium-ion batteries is usually 1℃ or lower, while the maximum charging rate for laptop batteries is 0.9℃. The so-called 1C charging rate refers to charging with a current of 1 times the capacity, and the charging time is 1 hour. In fact, in order to make the battery have a longer service life, it is basically charged at 0.1~0.3℃ for 10~4 hours.
National standards stipulate that the charging current of lithium-ion batteries is 02.C-1C, and the charging current of 100AH batteries can be 20A-100A. In other words, if a 1500mAh battery is charged to 0.2C, the charging current is 0.2×1500=300mA, and it will charge for 5 hours.
Lithium iron phosphate batteries generally can use 1C or higher charge and discharge current (15C), so they are more suitable for power lithium batteries.
The charging current of lithium-ion batteries is generally set between 0.2C and 1C. The greater the current, the faster the charging, and the greater the heat generated by the battery. In addition, charging with too much current will result in insufficient capacity, because the electrochemical reaction inside the battery takes time.
Li-ion battery charging principle
The working principle of a lithium-ion battery refers to the principle of charging and discharging. When the battery is charged, lithium ions are generated at the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte.
The carbon as the negative electrode has a layered structure. It has many micropores. Lithium ions reaching the negative electrode are inserted into the micropores of the carbon layer. The more lithium ions are inserted, the higher the charging capacity.
In the same way, when the battery is discharged (that is, when we use the battery), the lithium ions embedded in the carbon layer of the negative electrode are released and moved back to the positive electrode. The more lithium ions return to the positive electrode, the greater the discharge capacity. The battery capacity we usually call refers to the discharge capacity.
Lithium-ion batteries usually need to control the charging process in four stages: maintenance charging (low-voltage pre-charging), constant current charging, constant voltage charging, and charging termination.
When there is no charge management chip to directly charge the lithium-ion battery, the lithium-ion battery will suddenly enter a large current when it is discharged quickly, causing damage to the lithium-ion battery. Because of the large current and rapid heating, the battery life will be shortened. Take shortcuts.