CN103354350A - Voltage protection method for single lithium battery - Google Patents
Voltage protection method for single lithium battery Download PDFInfo
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- CN103354350A CN103354350A CN2013102773917A CN201310277391A CN103354350A CN 103354350 A CN103354350 A CN 103354350A CN 2013102773917 A CN2013102773917 A CN 2013102773917A CN 201310277391 A CN201310277391 A CN 201310277391A CN 103354350 A CN103354350 A CN 103354350A
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Abstract
The invention discloses a voltage protection method for a single lithium battery and relates to the technical field of battery protection. A circuit is composed of four photoelectric coupling elements, an overvoltage detection circuit and an undervoltage detection circuit. When the battery is being charged, power voltage enables a first photoelectric coupling element to switch on and the overvoltage detection circuit is closed. When battery charging voltage reaches to a predetermined value, current in the circuit drives a second photoelectric coupling element to switch on and therefore the circuit in linkage is made to disconnect a charging power source. When the battery is being used, voltage across a load enables the third photoelectric coupling element to switch on and the undervoltage detection circuit is closed. When the battery voltage is decreased to a determined value, the current in the circuit becomes too small to maintain the conduction of the fourth photoelectric coupling element and therefore the circuit in linkage gives out alarms or cuts off load current. The voltage protection for the single lead-acid battery has an advantage that the protection circuit only works when charging or using the battery and does not work when the battery is in a standby state, so that no current needs to be supplied to a monitoring circuit and electric energy consumption is eliminated.
Description
Technical field
The present invention relates to the battery protection technical field, specifically a kind of single lithium battery voltage protection method
, the single lithium battery voltage protection circuit that especially only when charging and use, just drops into.
Background technology
Common battery pack does not arrange the monomer battery voltage protective circuit.Even being arranged, the protection of this respect also mostly adopts the method for fixing access.No matter namely battery is all being worked in what state (charging, stand-by, use) protection.Although it is little that protective circuit consumes electric energy, if the battery long period is in dormant state, then power consumption then should not ignored the damage of battery.Some power tool batteries particularly, the circuit negative interaction of this long-term participation follow-up work clearly.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the invention provides a kind of single lithium battery voltage protection method, just only drop into when battery charge and during use, during battery is stand-by, do not participate in work, do not supply with the observation circuit electric current, do not produce power consumption.
The present invention realizes with following technical scheme: a kind of single lithium battery voltage protection circuit, and the two ends of lithium battery are parallel with respectively charge protector and load protection circuit; Described charge protector comprises the first optocoupler components, the second optocoupler components and for detection of the overvoltage detection circuit of lithium battery voltage; The output of the first optocoupler components connects the two ends that are connected in parallel on battery behind the input of the second optocoupler components by overvoltage detection circuit, charging voltage makes the first optocoupler components open-minded, and the output of the second optocoupler components is used for driving the shutoff charging current;
Described load protection circuit comprises the 3rd optocoupler components, the 4th optocoupler components and for detection of the Undervoltage detection circuit of lithium battery voltage; The output of the 3rd optocoupler components connects the two ends that are connected in parallel on battery behind the input of the 4th optocoupler components by Undervoltage detection circuit, voltage in the load makes the 3rd optocoupler components open-minded, and the output of the 4th optocoupler components is used for driving the switching off load electric current;
During the battery charging, supply voltage makes the first optocoupler components conducting, opens overvoltage detection circuit, and when battery charging voltage arrived set point greatly, current drives the second optocoupler components conducting linkage circuit in the circuit disconnected charge power supply;
When battery uses, voltage in the load makes the 3rd optocoupler components conducting, open Undervoltage detection circuit, when cell voltage reduced to set point, the electric current in the circuit is reduced to can not be kept the 4th optocoupler components conducting linkage circuit and provide and report to the police or the switching off load electric current.
The invention has the beneficial effects as follows: circuit only when battery charge, automatically follow voltage when using and drop into, do not consume the beneficial effect of electric energy during having battery stand-by, avoid battery to be in long-time low discharging current dormant state, the useful life of prolongation battery.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples
Fig. 1 is principle of the invention structured flowchart;
Fig. 2 is circuit diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of single lithium battery voltage protection method is to be parallel with respectively charge protector and load protection circuit at the two ends of lithium battery.Described charge protector comprises the first optocoupler components, the second optocoupler components and for detection of the overvoltage detection circuit of lithium battery voltage; The output of the first optocoupler components connects the two ends that are connected in parallel on battery behind the input of the second optocoupler components by overvoltage detection circuit, charging voltage makes the first optocoupler components open-minded, and the output of the second optocoupler components is used for driving the shutoff charging current.
Described load protection circuit comprises the 3rd optocoupler components, the 4th optocoupler components and for detection of the Undervoltage detection circuit of lithium battery voltage; The output of the 3rd optocoupler components connects the two ends that are connected in parallel on battery behind the input of the 4th optocoupler components by Undervoltage detection circuit, voltage in the load makes the 3rd optocoupler components open-minded, and the output of the 4th optocoupler components is used for driving the switching off load electric current.
Follow charging voltage during the battery charging, drop into overvoltage detection circuit; Follow load voltage when battery uses and drop into Undervoltage detection circuit.
During the battery charging, supply voltage makes the first optocoupler components conducting, opens overvoltage detection circuit, and when battery charging voltage arrived set point greatly, current drives the second optocoupler components conducting linkage circuit in the circuit disconnected charge power supply.
When battery uses, voltage in the load makes the 3rd optocoupler components conducting, open Undervoltage detection circuit, when cell voltage reduced to set point, the electric current in the circuit is reduced to can not be kept the 4th optocoupler components conducting linkage circuit and provide and report to the police or the switching off load electric current.
As shown in Figure 2, overvoltage detection circuit comprises the reference voltage adjustable voltage stabilizer, the negative electrode of reference voltage adjustable voltage stabilizer and with reference to being parallel with resistance R 3 between the utmost point, anode and with reference to being parallel with adjustable resistance RP1 between the utmost point; The negative electrode of reference voltage adjustable voltage stabilizer be connected the output of optocoupler components and connect, anode be connected the input of optocoupler components and connect; Described Undervoltage detection circuit adopts light-emitting diode, and the output of the positive pole of light-emitting diode and the 3rd optocoupler components connects, and the input of negative pole and the 4th optocoupler components connects.Wherein, four optocoupler components all adopt the PC817 photoelectrical coupler, and the reference voltage adjustable voltage stabilizer adopts TL431 reference voltage adjustable voltage stabilizer, and light-emitting diode adopts 1.8 volts of leucismus Red LED1s; Adjustable resistance RP1 adopts 0.5 watt of 47 kilohms of multiturn potentiometer, and also available 0.5 watt of 22 kilohms of metal film resistor substitutes; Resistance R 1 adopts 0.5 watt of 47 ohmic resistor; Resistance R 2 adopts 0.5 watt of 470 ohmic resistor; Resistance R 3 adopts 0.5 watt of 82 kilohms of metal film resistor.
Claims (2)
1. single lithium battery voltage protection method, it is characterized in that: the two ends of lithium battery are parallel with respectively charge protector and load protection circuit; Described charge protector comprises the first optocoupler components, the second optocoupler components and for detection of the overvoltage detection circuit of lithium battery voltage; The output of the first optocoupler components connects the two ends that are connected in parallel on battery behind the input of the second optocoupler components by overvoltage detection circuit, charging voltage makes the first optocoupler components open-minded, and the output of the second optocoupler components is used for driving the shutoff charging current;
Described load protection circuit comprises the 3rd optocoupler components, the 4th optocoupler components and for detection of the Undervoltage detection circuit of lithium battery voltage; The output of the 3rd optocoupler components connects the two ends that are connected in parallel on battery behind the input of the 4th optocoupler components by Undervoltage detection circuit, voltage in the load makes the 3rd optocoupler components open-minded, and the output of the 4th optocoupler components is used for driving the switching off load electric current;
During the battery charging, supply voltage makes the first optocoupler components conducting, opens overvoltage detection circuit, and when battery charging voltage arrived set point greatly, current drives the second optocoupler components conducting linkage circuit in the circuit disconnected charge power supply;
When battery uses, voltage in the load makes the 3rd optocoupler components conducting, open Undervoltage detection circuit, when cell voltage reduced to set point, the electric current in the circuit is reduced to can not be kept the 4th optocoupler components conducting linkage circuit and provide and report to the police or the switching off load electric current.
2. a kind of single lithium battery voltage protection method according to claim 1, it is characterized in that: described overvoltage detection circuit comprises the reference voltage adjustable voltage stabilizer, the negative electrode of reference voltage adjustable voltage stabilizer and with reference to being parallel with resistance R 3 between the utmost point, anode and with reference to being parallel with adjustable resistance RP1 between the utmost point; The negative electrode of reference voltage adjustable voltage stabilizer be connected the output of optocoupler components and connect, anode be connected the input of optocoupler components and connect; Described Undervoltage detection circuit adopts light-emitting diode, and the output of the positive pole of light-emitting diode and the 3rd optocoupler components connects, and the input of negative pole and the 4th optocoupler components connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310277391.7A CN103354350B (en) | 2013-07-04 | 2013-07-04 | A kind of voltage protection method for single lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310277391.7A CN103354350B (en) | 2013-07-04 | 2013-07-04 | A kind of voltage protection method for single lithium battery |
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| Publication Number | Publication Date |
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| CN103354350A true CN103354350A (en) | 2013-10-16 |
| CN103354350B CN103354350B (en) | 2016-08-10 |
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| CN201310277391.7A Active CN103354350B (en) | 2013-07-04 | 2013-07-04 | A kind of voltage protection method for single lithium battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977962A (en) * | 2015-07-08 | 2015-10-14 | 中北大学 | Temperature-control combined power supply |
| CN110837037A (en) * | 2019-11-13 | 2020-02-25 | 福建星云电子股份有限公司 | Secondary overvoltage detection circuit for lithium battery pack protection plate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075667A (en) * | 2006-05-16 | 2007-11-21 | 有量科技股份有限公司 | Lithium-cell protector and its protection |
| CN101414749A (en) * | 2008-12-09 | 2009-04-22 | 李鹏 | Protection device for rechargeable battery set |
| CN101795010A (en) * | 2009-12-31 | 2010-08-04 | 惠州市亿能电子有限公司 | Lithium battery protection circuit and protection method thereof |
| JP2011067004A (en) * | 2009-09-17 | 2011-03-31 | Hitachi Koki Co Ltd | Battery pack and power tool |
| CN202930922U (en) * | 2012-11-30 | 2013-05-08 | 深圳Tcl新技术有限公司 | Lithium battery protective circuit |
-
2013
- 2013-07-04 CN CN201310277391.7A patent/CN103354350B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075667A (en) * | 2006-05-16 | 2007-11-21 | 有量科技股份有限公司 | Lithium-cell protector and its protection |
| CN101414749A (en) * | 2008-12-09 | 2009-04-22 | 李鹏 | Protection device for rechargeable battery set |
| JP2011067004A (en) * | 2009-09-17 | 2011-03-31 | Hitachi Koki Co Ltd | Battery pack and power tool |
| CN101795010A (en) * | 2009-12-31 | 2010-08-04 | 惠州市亿能电子有限公司 | Lithium battery protection circuit and protection method thereof |
| CN202930922U (en) * | 2012-11-30 | 2013-05-08 | 深圳Tcl新技术有限公司 | Lithium battery protective circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977962A (en) * | 2015-07-08 | 2015-10-14 | 中北大学 | Temperature-control combined power supply |
| CN104977962B (en) * | 2015-07-08 | 2017-01-11 | 中北大学 | Temperature-control combined power supply |
| CN110837037A (en) * | 2019-11-13 | 2020-02-25 | 福建星云电子股份有限公司 | Secondary overvoltage detection circuit for lithium battery pack protection plate |
| CN110837037B (en) * | 2019-11-13 | 2021-12-14 | 福建星云电子股份有限公司 | Secondary overvoltage detection circuit for lithium battery pack protection plate |
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| CN103354350B (en) | 2016-08-10 |
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