Lithium battery charge and discharge protection circuit and lithium battery protection system
A protection circuit, charge and discharge technology, applied in battery overcurrent protection, battery overvoltage protection, battery circuit devices, etc., can solve problems such as damage, abnormal chip function, chip overheating, etc., to avoid overheating, eliminate diode voltage drop, Guaranteed normal operation
Pending Publication Date: 2021-10-01
SUZHOU XYSEMI ELECTRONICS TECH CO LTD +1
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Problems solved by technology
In the existing solution, when the voltage of the lithium battery is above the overcharge voltage value, and during the process of discharging the lithium battery, there will be a diode voltage drop at both ends of the power transistor. At this time, if the discharge current is large or a short circuit occurs, It will cause the chip to overheat, and in severe cases, it will cause abnormal function and damage of the chip
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[0039] 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.
[0040]As mentioned in the background, in the existing lithium battery protection circuit, especially for the case where the power transistor and the controller are integrated on the same substrate, or the power transistor and the controller are chips on different substrates but in the same package , when the voltage of the lithium battery is above the overcharge voltage value, when the lithium battery is discharged, since the power transistor is in an off state, it will discharge through the parasitic diode of the ...
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The embodiment of the invention discloses a lithium battery charge and discharge protection circuit and a lithium battery protection system. The lithium battery charge and discharge protection circuit comprises a discharge overcurrent detection circuit, an overcharge voltage detection circuit, a charge and discharge detection circuit, a logic circuit, a time delay circuit, a drive circuit, a first transistor and a state switching circuit. The charge and discharge detection circuit is used for generating a first control signal according to the size of a first power supply voltage or the size of a discharge overcurrent control signal, the logic circuit is used for generating a second control signal according to the first control signal and an overcharge voltage control signal, and the driving circuit is used for, when the lithium battery charges and discharges, enabling the first transistor to be turned on or off according to the second control signal. According to the technical scheme provided by the embodiment of the invention, when the voltage of the lithium battery is higher than the overcharge voltage for discharge, the voltage drop of the diode at the two ends of the first transistor during discharge of the lithium battery is eliminated through the charge and discharge detection circuit, and the phenomenon of overheating caused by current flowing through 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 charge and discharge protection circuit and a lithium battery protection system. 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 on the same substrate or on different substrates but packaged in the same package. In the existing scheme, when the voltage of the lithium battery is above the overcharge voltage value, and during the process of discharging the lithium battery, there will be a diode voltage drop at both ends of the power transistor. At this time, if the discharge current is large or a short circuit occurs, It will cause the chip to overheat, and in severe cases, it will cause abnormal function and da...
Claims
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IPC IPC(8): H02J7/00
CPCH02J7/00308H02J7/00304H02J7/007182H02J7/00714Y02E60/10
Inventor 蒋锦茂谭健
Owner SUZHOU XYSEMI ELECTRONICS TECH CO LTD