Method and device for rapid charging of lithium ion battery

Abstract

The invention provides a method and a device for rapid charging of a lithium ion battery. The device for rapid charging of the lithium ion battery comprises a DC constant current power supply which is connected to the lithium ion battery to be charged, and a controllable switch which is connected to the lithium ion battery and the DC constant current power supply in series so that a series circuit is formed and is used for connecting to or cutting off the series circuit. The device is characterized in that the device comprises a control module which is connected to the lithium ion battery and the controllable switch and is used for detecting terminal voltage and a terminal voltage change rate of the lithium ion battery, when the detected terminal voltage is lower than a charging threshold, the control module controls the controllable switch to connect the series circuit so that the lithium ion battery is charged, and when the detected terminal voltage is higher than the charging threshold and a detected terminal voltage change rate curve is obviously declined, the control module controls the controllable switch to cut off the series circuit so that lithium ion battery charging is stopped.

Description

technical field [0001] The invention relates to a rechargeable secondary lithium-ion battery charging device and a charging method thereof, in particular to a lithium-ion battery charging device and a charging method capable of fast charging and suppressing battery aging. Background technique [0002] As a charging method for non-aqueous secondary batteries such as lithium ion batteries and Ni-MH batteries, continuous charging and pulse charging are generally used. In continuous charging, it can be further subdivided into three modes: constant current charging, constant voltage charging and constant current-constant voltage charging. When charging a non-aqueous secondary battery, if the charging voltage is too high, the performance of the battery will be significantly deteriorated, and accidents such as combustion and explosion may even occur. Therefore, great care must be taken so that the charging voltage does not exceed a given voltage. [0003] In order to achieve a co...

AI Technical Summary

Problems solved by technology

In fact, for aging batteries that have been used for a period of time, due to the increase in the internal resistance of the battery, the time of the constant current charging phase is shortened, and the impact of constant voltage charging on the charging speed of the battery is more significant.

[0006] The above-mentioned charging method uses the terminal voltage of the battery as the control parameter for battery charging mode switching and charging termination, which is not conducive to improving the charging speed of the battery. For example, patents 98122261.7 and 01121097.4

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