Lithium battery charging method and device

Abstract

The invention relates to a lithium battery charging method and device. The charging process comprises a first charging control state and a second charging control state. The lithium battery charging method comprises the steps of: after entering a first charging control state, reducing a power supply voltage output by a power supply end and keeping the charging of a lithium battery BT1 by the charging end until a voltage difference between the power supply voltage output by the power supply end and the lithium battery BT1 is smaller than a preset voltage threshold VTH, stopping charging the lithium battery BT1 by the charging end and entering a second charging control state; and after entering the second charging control state, when an acquired load current is smaller than a load current threshold ITH, boosting the power supply voltage output by the power supply end, and recovering a charging state of the lithium battery BT1 by the charging end until the acquired load current during charging is greater than the load current threshold ITH or the power supply voltage output by the power supply end is in a rated voltage state. The lithium battery charging method and the device can effectively improve the charging efficiency of the lithium battery, and are safe and reliable.

Description

technical field [0001] The invention relates to a charging method and device, in particular to a lithium battery charging method and device. Background technique [0002] At present, charging the lithium battery includes a charging terminal connected to the lithium battery and a power supply terminal connected to an external power source, and the effective charging of the lithium battery is realized through the cooperation of the power supply terminal and the charging terminal. When charging, the required voltage can be generated through the power supply terminal, the charging current and the maximum output voltage can be controlled through the charging terminal, that is, the constant current / constant voltage control can be realized through the charging terminal, and the battery voltage gradually increases from a certain voltage during charging. [0003] When charging a lithium battery, the charging end will generate losses. Specifically, the loss is proportional to the volt...

AI Technical Summary

Problems solved by technology

[0003] When charging a lithium battery, the charging end will generate losses. Specifically, the loss is proportional to the voltage difference between the output voltage of the charging end and the battery voltage. For example, the current for the lithium battery is 1A, and the output voltage of the charging end is 5V. , the voltage of the lithium battery at the receiving end is 3.0V, the efficiency loss is (5V-3V)*1A=2w, and the effective power, that is, the energy obtained by the lithium battery is: 3V*1A=3w, and the charging efficiency is only: 3w / (2w +3w) = 60%

The low charging efficiency makes it difficult to meet the current demand for charging

Images