Battery protection circuit and mobile terminal

Abstract

The invention provides a battery protection circuit, which is provided with a voltage detection positive electrode port and a voltage detection negative electrode port, and comprises a battery cell, at least one battery protection chip, a positive electrode leading-out link and a negative electrode leading-out link, the positive electrode leading-out link and the negative electrode leading-out link are electrically connected with the positive electrode and the negative electrode of the battery cell respectively and are electrically connected with the voltage detection positive electrode port and the voltage detection negative electrode port respectively, so that when the battery protection circuit is in a charging state and when the voltage of the battery cell is detected, other circuit components are not needed, the voltage of the battery cell is directly detected, so that the problem that the battery cell enters a constant-voltage charging stage too early due to the fact that the measured voltage of the battery cell is too large due to the influence of voltage drop of devices in the battery protection circuit, and the charging time is prolonged is solved, and meanwhile, due to the fact that the switch unit is introduced into the positive electrode leading-out link, the battery cell can be prevented from being over-discharged.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a battery protection circuit and a mobile terminal. Background technique [0002] In recent years, the fast charging technology applied to mobile terminals has developed rapidly. The charging power of mobile terminals has increased from the early 10W to 25W, 40W, 50W, and even 65W. With the increase of charging power, the charging power flowing through the mobile terminal battery The current is also getting larger and larger, which in turn will cause the voltage drop of the battery protection board of the mobile terminal to become larger and larger during the charging process. When charging, the mobile terminal will detect the voltage of the battery cell in real time, and when the voltage of the battery cell increases to a certain value, the mobile terminal will be controlled to enter the constant voltage charging stage. [0003] However, due to the increase in the voltage...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a battery protection circuit and a mobile terminal, which effectively solves the problem of the voltage drop of the battery cell detected by the mobile terminal due to the influence of the device voltage drop in the battery protection board during the charging process of the mobile terminal. It is greater than the actual voltage, which will cause the mobile terminal to enter the constant voltage charging stage prematurely and increase the charging time of the mobile terminal.

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