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Charge-discharge protection circuit and lithium battery protection system

A technology for protecting circuits and charging voltages, applied in battery over-discharge protection, safety/protection circuits, emergency protection circuit devices, etc., which can solve problems such as accelerating battery damage and damaging batteries

Active Publication Date: 2021-01-15
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-discharge protection circuit and lithium battery protection system
  • Charge-discharge protection circuit and lithium battery protection system
  • Charge-discharge protection circuit and lithium battery protection system

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Embodiment Construction

[0039] Such as figure 1 with image 3 As shown, the present 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, wherein:

[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 ...

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Abstract

The invention discloses a charging and discharging protection circuit and a lithium battery protection system, and the circuit comprises a battery protection circuit, a battery, a charger or a load, and an RC filter circuit. The RC filter circuit comprises a first resistor and a first capacitor, one end of the first resistor is connected with one end of the first capacitor and then connected witha VDD end of the battery protection circuit, and the other end is connected with a battery positive electrode; the battery protection circuit comprises a charging voltage protection circuit or a discharging voltage protection circuit, and further comprises a basic protection circuit, an AND gate, a driving circuit and a first MOS transistor, and the charging voltage protection circuit or the discharging voltage protection circuit and the basic protection circuit are connected with the input end of the AND gate. Through the cooperation of a second time delay circuit and a counter, the output ofa latch circuit controls the output of a logic circuit, the locking of a charging and discharging loop is realized by closing the first MOS transistor, and the situation that the battery is damaged due to repeated charging and discharging is avoided.

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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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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