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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.

Active Publication Date: 2021-03-09
SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention proposes a charging and discharging protection circuit and a lithium battery protection system to solve the problem of accelerated battery damage or direct battery damage caused by repeated charging or repeated discharging of existing batteries

Method used

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  • Charge and discharge protection circuit and lithium battery protection system
  • Charge and discharge protection circuit and lithium battery protection system
  • Charge and discharge protection circuit and lithium battery protection system

Examples

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Embodiment Construction

[0039] Such as figure 1 with image 3 As shown, the application provides a charging voltage protection circuit, including an overcharge voltage judging circuit 1, a first delay circuit 3, a second delay circuit 4, a counter 5, a logic circuit 6, a latch circuit 7 and a discharge detection circuit Circuit 8, where:

[0040]The overcharge voltage judging circuit 1 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first switch K1, a second switch K2 and a first comparator COMP1, one end of the second resistor R2 is connected to the VDD end, and the second resistor The other end of R2 is connected to one end of the third resistor R3 and the first end of the first switch K1; the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the first end of the second switch K2, and the other end of the fourth resistor R4 is connected to the VGND end; The second end of a switch K1 is connected to the second end of the second swi...

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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 .

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02H7/18
CPCH02H7/18H02J7/0031H02J7/00302H02J7/00306H02J7/00308
Inventor 蒋锦茂黄孟春顾得全
Owner SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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