Method and apparatus for charging batteries

Abstract

The embodiment of the invention discloses a battery charging method, which comprises following steps: charging a battery in a constant-current manner; stopping constant-current charging when the voltage of the battery end reaches a charging critical voltage; charging the battery in a constant-voltage manner by using a voltage as the critical charging voltage; stopping constant-voltage charging when the charging current reaches a charge cutoff current; and arranging the battery in an open standby state. The embodiment also discloses a battery charging device, which comprises a central processing unit, a detection unit, a battery and a charging / discharging control unit, wherein the units are matched with each other to charge the battery in constant-current manner, the constant-current charging is stopped when the voltage of the battery end reaches to the charging critical voltage, the battery is charged in a constant-voltage manner by using a voltage as the critical charging voltage, then constant-voltage charging is stopped when the charging current reaches to a charge cutoff current, and the battery is set in an open standby state. The battery charging method and the device provided by the embodiment can prolong the service life of the battery and improve the battery security.

Description

technical field [0001] The invention relates to the battery field, in particular to a battery charging method and device. Background technique [0002] The existing lithium battery adopts the constant current and constant voltage charging method. When the charging is completed, the battery is float charged. The specific charging principle is as follows: figure 1 shown. see figure 1 , figure 1 It is a schematic diagram of charging principle in the prior art. Depend on figure 1 It can be seen that in the process of charging the battery, the battery must first be charged with a constant current, and when the charging voltage reaches the charging limit voltage, the constant current charging is ended and the constant voltage charging is performed; when the constant voltage charging is completed, the floating charge is applied. voltage to float charge the battery. After that, the battery may enter the discharge process, and then a new round of constant current and constant v...

AI Technical Summary

Problems solved by technology

[0003] It can be seen from the above that the current lithium battery charging method makes the charging voltage stay at the charging limit voltage for a long time, and the charging voltage will stay at the floating charging voltage for a long time during floating charging.

However, based on the characteristics of lithium batteries, the charging limit voltage is usually the highest voltage that the lithium battery can withstand. Long-term charging limit voltage will inevitably reduce the service life of the battery and affect the safety of the battery; Overcharging the battery will also significantly reduce the service life of the battery and seriously affect the safety of the battery

Images