A single-cell lithium battery protection chip with precise delay and sleep function

A technology for protecting chips and lithium batteries, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of reducing the working efficiency of lithium batteries, shortening the service life of lithium batteries, complex chemical reactions of charging and discharging, etc., and achieves high detection voltage step The effect of precision, simple structure and low cost
CN103532106BActive Publication Date: 2016-05-25苏州皓晗微电子科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
苏州皓晗微电子科技有限公司
Publication Date
2016-05-25

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Abstract

The invention relates to a single lithium battery protection chip with accurate delay and dormancy functions. The chip internally comprises a control module and a detection module, wherein the detection module is used for comparing a voltage at the end VDD of a lithium battery with an overcharge detection voltage and an overdischarge detection voltage and comparing a voltage at the end VM with an overcurrent detection voltage, a short-circuit detection voltage and a charge detection voltage to obtain comparison signals; the control module is used for processing the comparison signals, judging the working state of the lithium battery and cutting off a charge or discharge switch to protect the lithium battery according to the actual situation. When the lithium battery just enters an overdischarge state, a difference between the voltage at the end VDD and the voltage at the end VM is detected; when the value of VDD-VM is lower than that of a dormancy detection voltage and an external circuit does not form a short circuit, the control module is used for controlling the chip to enter the dormancy state to reduce the power consumption and prolong the work time; protection measures adopted when the lithium battery enters an abnormal state are kept, and when the state of the lithium battery is restored, the charge or discharge switch is switched on to remove the abnormal state.
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Description

technical field

[0001] The invention belongs to the field of lithium battery protection, and relates to a lithium battery protection chip, in particular to a single lithium battery protection chip with precise time delay and dormancy functions. Background technique

[0002] With the development of society and the continuous consumption of petrochemical energy, people are actively looking for new energy to replace the petrochemical energy that will be exhausted one day. Electric energy is one of the ideal substitutes for fossil energy, so people's demand for electric energy has been increasing in recent years. With the development and popularization of unmanned electronic equipment, portable digital equipment, electric tools, electric vehicles, etc., the power core - the battery is receiving more and more attention. Lithium batteries are favored by manufacturers for their high specific energy, long cycle life, small self-discharge, no memory effect, and environmental protect...

Claims

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