Lithium battery protection circuit applied to mobile phone

Abstract

The invention discloses a lithium battery protection circuit applied to a mobile phone. The lithium battery protection circuit comprises a B+ end, a B- end, a P+ end, a P- end, a battery protection circuit, an anti-static circuit, an identity recognition circuit, an ID end, a temperature monitoring circuit and an NTC end; the battery protection circuit comprises a first resistor, a lithium batteryprotection chip, a charging and discharging control chip, a filtering circuit, a second resistor and a first capacitor; and the filtering circuit comprises a second capacitor and a third capacitor connected in parallel, wherein the capacitance value difference of the second capacitor and the third capacitor is equal to two orders of magnitudes or more. By virtue of the lithium battery protectioncircuit applied to the mobile phone, overcharging, over-discharging and overcurrent control and protection for the lithium battery can be performed effectively by virtue of matching of the lithium battery protection chip and the charging and discharging control chip; and by setting the filtering circuit at the VDD end and the VSS end of the lithium battery protection chip, interference to the lithium battery monitoring and control by the lithium battery protection chip from power supply interference signals of different frequencies can be prevented, so that the lithium battery can be protectedmore accurately and sensitively.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery protection circuit applied to mobile phones. Background technique [0002] At present, mobile phones have become one of the portable tools in people's lives. In order to improve the battery life of mobile phones, existing mobile phones are generally equipped with lithium batteries as a power supply. In the daily charging and discharging process of lithium batteries, overcharge and overdischarge are prone to occur. Repeated overcharging and overdischarging will cause permanent damage to the lithium battery, and when the lithium battery is damaged and continues to be used, it is easy to cause the lithium battery to explode, thus causing accidents. [0003] However, the existing battery protection circuit generally uses a lithium battery protection chip to control and protect the lithium battery. Because there are power interference signals of different ...

AI Technical Summary

Problems solved by technology

In the daily charging and discharging process of lithium batteries, overcharge and overdischarge are prone to occur.

Repeated overcharging and overdischarging will cause permanent damage to the lithium battery, and if the lithium battery is still used after it is damaged, it will easily cause the lithium battery to explode, thus causing accidents

[0003] However, the existing battery protection circuit generally uses a lithium battery protection chip to control and protect the lithium battery. Because there are power interference signals of different frequencies in the circuit, it is easy to cause the lithium battery protection chip to lag behind in the control and protection of the lithium battery, resulting in The overcharge and overdischarge of lithium batteries cannot be controlled in time, which affects the service life of lithium batteries

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