Lithium battery charging protection circuit and lithium battery

A charging protection, lithium battery technology, applied in battery circuit devices, emergency protection circuit devices, circuit devices, etc., can solve problems such as abnormal chip function and chip overheating, and achieve the effect of eliminating voltage drop, avoiding overheating, and protecting normal operation.

Pending Publication Date: 2021-04-20
SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the power transistor and the controller are integrated in the same chip or in the same package. When the voltage of the lithium battery is below the over-discharge voltage value, during the charging process of the lithium battery, there will be Diode voltage drop, at this time, if the charging current is large or the charging time is long, it will cause the chip to overheat, and in severe cases, it will cause the chip to function abnormally

Method used

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  • Lithium battery charging protection circuit and lithium battery
  • Lithium battery charging protection circuit and lithium battery
  • Lithium battery charging protection circuit and lithium battery

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0039] As described in the background technology, in the existing lithium battery protection circuit, especially for the case where the power transistor and the controller are integrated on the same chip, or the power transistor and the controller are different chips but in the same package, when the lithium battery When the voltage of the battery is below the over-discharge voltage value, in the process of charging the lithium battery, since the power transistor is in the disconnected state, it will be charged thr...

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PUM

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Abstract

The embodiment of the invention discloses a lithium battery charging protection circuit and a lithium battery. The lithium battery charging protection circuit comprises an over-discharge voltage detection circuit, a charging detection circuit, a logic circuit, a driving circuit, a first transistor and a state switching circuit. The over-discharge voltage detection circuit is used for generating an over-discharge voltage control signal according to the magnitude relationship between an over-discharge detection voltage and a reference voltage; the charging detection circuit is used for generating a first control signal according to the second power supply voltage; the logic circuit is used for generating a second control signal according to the over-discharge voltage control signal and the first control signal; and the driving circuit generates a gate control signal according to the second control signal so as to drive the first transistor to be turned on or turned off. According to the technical scheme provided by the embodiment of the invention, when the over-discharge detection voltage of the lithium battery is reduced to be lower than the over-discharge voltage value for charging, the voltage drop at the two ends of the first transistor during charging can be eliminated through the charging detection circuit, and a phenomenon that a chip is overheated due to the voltage drop of the diode is avoided.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium battery protection, in particular to a lithium battery charging protection circuit and a lithium battery. Background technique [0002] As the application range of lithium batteries becomes wider and wider, the safety protection of lithium batteries becomes more and more important. [0003] In the prior art, the power transistor and the controller are integrated in the same chip or in the same package. When the voltage of the lithium battery is below the over-discharge voltage value, during the charging process of the lithium battery, there will be Diode voltage drop, at this time, if the charging current is large or the charging time is long, it will cause the chip to overheat, and in severe cases, it will cause the chip to function abnormally. Contents of the invention [0004] The embodiments of the present invention provide a lithium battery charging protection cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02H7/18
Inventor 蒋锦茂张以见
Owner SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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