Charge and discharge protection circuit and lithium battery protection system

A protection circuit, charging voltage technology, applied in safety/protection circuits, battery over-discharge protection, emergency protection circuit devices, etc., can solve problems such as damage to batteries, accelerated battery damage, etc.
CN112234689BActive Publication Date: 2021-03-09SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SUZHOU XYSEMI ELECTRONICS TECH CO LTD
Publication Date
2021-03-09

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Abstract

The invention discloses a charging and discharging protection circuit and a lithium battery protection system, including a battery protection circuit, a battery, a charger or a load, and an RC filter circuit, wherein the RC filter circuit includes a first resistor and a first capacitor, and one end of the first resistor is After connecting one end of the first capacitor, connect to the VDD end of the battery protection circuit, and connect the other end of the first resistor to the positive pole of the battery; the battery protection circuit includes a charging voltage protection circuit or a discharge voltage protection circuit, and also includes a basic protection circuit, an AND gate, a drive circuit and a second A MOS tube, the charge voltage protection circuit or the discharge voltage protection circuit and the basic protection circuit are all connected to the input terminal of the AND gate. In the present invention, through the cooperation of the second delay circuit and the counter, the output of the latch circuit controls the output of the logic circuit, and the locking of the charging and discharging loop is realized by closing the first MOS tube, thereby avoiding repeated charging and discharging and thus damaging the battery .
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Description

technical field

[0001] The invention relates to the technical field of lithium battery protection, in particular to a charging and discharging protection circuit and a lithium battery protection system. Background technique

[0002] In the prior art, lithium battery protection systems are widely used, especially for the miniaturization of battery capacity, for example, the existing battery capacity is only tens of mAh, or even 20 mAH.

[0003] The current charging current is rarely 0.5C (20mAH battery is 10mA) or 1C charging, most of the application charging current is greater than 1C, especially the progress of fast charging technology, in the fast charging stage, it will be charged with a current of 2C or even 5C or more , which will cause damage to the battery. After using for a period of time, the capacity of the battery becomes smaller and the parasitic internal resistance of the battery increases. At this time, when charging with a large current, if the charging overc...

Claims

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