CN202840563U - Rechargeable battery protective circuit - Google Patents
Rechargeable battery protective circuit Download PDFInfo
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- CN202840563U CN202840563U CN 201220384390 CN201220384390U CN202840563U CN 202840563 U CN202840563 U CN 202840563U CN 201220384390 CN201220384390 CN 201220384390 CN 201220384390 U CN201220384390 U CN 201220384390U CN 202840563 U CN202840563 U CN 202840563U
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- rechargeable battery
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Abstract
The utility model discloses a rechargeable battery protective circuit which comprises a temperature detection circuit, a voltage detection circuit, a judgment unit and a self-discharge circuit, wherein the temperature detection circuit is used to detect the temperature of rechargeable batteries; the voltage detection circuit is used to detect the voltage of rechargeable batteries; on and off of the self-discharge circuit are controlled based on the temperature and voltage of rechargeable batteries. Specifically, when the temperature of rechargeable batteries is higher than a temperature set value and output voltage is higher than a voltage set value, the self-discharge circuit is turned on, and rechargeable batteries discharge through the self-discharge circuit. Therefore, safety of rechargeable batteries in a high-temperature environment is guaranteed, and service life of rechargeable batteries is prolonged.
Description
Technical field
The application relates to the rechargeable battery technical field, particularly relates to the secondary battery protective circuit.
Background technology
In recent years, rechargeable battery is used widely as green energy resource, the useful life of rechargeable battery and fail safe are the problems that receives much concern always, such as, the danger of lithium battery full electricity operation under hot environment, and the lithium battery of full electricity is stored under hot environment the useful life that can shorten lithium battery for a long time.
At present, by in the protective circuit of rechargeable battery, having additional high-temperature protection circuit, to guarantee that the safety of rechargeable battery and useful life, traditional high-temperature protection circuit comprises two kinds under the hot conditions: a kind of is to adopt temperature switch to realize, temperature switch turn-offs when charging-cell temperature is higher, and then the switching tube in the cut-off protection circuit, so that rechargeable battery can not output voltage, like this, although the fail safe to battery has protection, affected the serviceability of battery; Another kind is to adopt thermistor to realize that this kind scheme need to increase the control that control circuit is realized rechargeable battery under the high-temperature condition in host side, and this kind rechargeable battery does not have versatility when cooperating with main frame.
The utility model content
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of secondary battery protective circuit, with the fail safe that guarantees that rechargeable battery uses under hot conditions, and prolongs its useful life, and technical scheme is as follows:
A kind of secondary battery protective circuit comprises: temperature sensing circuit, voltage detecting circuit, judging unit and self discharge circuit, wherein:
Described temperature sensing circuit detects the temperature on described rechargeable battery surface, and offers described judging unit;
Described voltage detecting circuit is connected between the two poles of the earth of described rechargeable battery, detects the output voltage of described rechargeable battery;
The first input end of judging unit links to each other with described temperature sensing circuit, the second input links to each other with described voltage detecting circuit, output links to each other with described self discharge circuit, when the temperature of described rechargeable battery is higher than desired temperature and output voltage and is higher than voltage setting value, the control signal that the described self discharge circuit of output control is opened.
Preferably, be provided with the thermistor of negative temperature coefficient in the described temperature sensing circuit, when the temperature that detects described rechargeable battery surface is higher than the temperature preset value, the output low level signal.
Preferably, when the output voltage that described voltage detecting circuit detects described rechargeable battery is higher than voltage setting value, the output low level signal.
Preferably, described judging unit is the NOR-logic gate circuit.
Preferably, described self discharge circuit comprises: discharge resistance and switching tube, wherein:
One end of described discharge resistance connects the positive pole of described rechargeable battery, and the other end connects the first end of described switching tube, and the second end of described switching tube connects the negative pole of described rechargeable battery, and the control end of described switching tube connects the output of described judging unit.
Preferably, described switching tube is the N slot field-effect transistor, and described first end is that source electrode, control end are grid for drain electrode, the second end.
The technical scheme that is provided by above the embodiment of the present application as seen; described secondary battery protective circuit; by detecting temperature and the voltage of rechargeable battery, control turning on and off of self discharge circuit, concrete; when the temperature of rechargeable battery is higher than desired temperature; and when output voltage is higher than voltage setting value, open described self discharge circuit, rechargeable battery discharges by this self discharge circuit; thereby guaranteed the fail safe of rechargeable battery under hot environment, and prolonged the useful life of rechargeable battery.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of a kind of secondary battery protective circuit of the embodiment of the present application.
Embodiment
In order to make those skilled in the art person understand better technical scheme among the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
See also Fig. 1, show the circuit theory schematic diagram of a kind of secondary battery protective circuit of the embodiment of the present application, this main circuit will comprise: temperature sensing circuit U1, voltage detecting circuit U2, judging unit U3 and self discharge circuit 100, wherein:
Described temperature sensing circuit U1 is arranged on the surface of described rechargeable battery, be used for detecting the temperature information on rechargeable battery surface, and export described judging unit U3 to, concrete, this temperature sensing circuit U1 can realize by the temperature detection chip, when the temperature that detects described rechargeable battery surface is higher than desired temperature, the output level upset.
Described voltage detecting circuit U2 is for detection of the information of voltage at described rechargeable battery the two poles of the earth, and when the voltage at the two poles of the earth that detect described rechargeable battery was higher than voltage setting value, output level overturn.
The first input end of described judging unit U3 connects the output of temperature sensing circuit U1, the second input connects the output of voltage detecting circuit U2, the output of judging unit U3 connects self discharge circuit 100, is used for the control signal of opening and turn-offing according to the described self discharge circuit 100 of level signal output control of temperature sensing circuit U1 and voltage detecting circuit U2 output.
During implementation, be provided with the overheat protector function in the application terminal of rechargeable battery, when the temperature of rechargeable battery is higher than the temperature preset value of described application terminal, this rechargeable battery will stop discharge, thereby guarantee that rechargeable battery can not damage;
And, described desired temperature is lower than the temperature preset value of described application terminal, when the temperature of rechargeable battery is higher than described desired temperature, is lower than described temperature preset value, and when the voltage of described rechargeable battery was lower than the voltage preset value, can there be potential safety hazard in rechargeable battery;
Therefore, the temperature that detects the rechargeable battery surface as temperature sensing circuit U1 is higher than described temperature preset value, and when the output voltage that voltage detecting circuit U2 detects rechargeable battery is higher than the voltage preset value, the control signal that output control self discharge circuit 100 is opened, make rechargeable battery by 100 discharges of self discharge circuit, guaranteeing the fail safe of rechargeable battery under high-temperature condition, and prolonged the useful life of rechargeable battery.
Preferably, see also Fig. 1, described secondary battery protective circuit also comprises configuration switch S1, filter capacitor C1 and sluggish capacitor C 2, wherein:
Described configuration switch S1 is single-pole double-throw switch (SPDT), is used for the lag time of the level upset of design temperature testing circuit U1.
Described filter capacitor C1 is connected between the positive and negative electrode of charging battery core, is used for the noise signal of the electric energy of filtering charging battery core output.Described temperature sensing circuit U1 has: sluggish pin HYS1, power cathode pin VSS, positive source pin VDD, reset pin RT, these 5 pins of detection pin DET, wherein:
The HYS1 pin connects the not moved end of configuration switch S1, and the moved end of configuration switch S1 connects respectively anodal B+ or the negative pole B-of the battery core of charging, thereby changes the hysteresis of voltage;
The VSS pin connects the negative pole B-of charging battery core, anodal B+ that the VDD pin connects the charging core, DET pin as the output connection judgment unit U3 of temperature sensing circuit U1.
One end of described capacitor C 2 is connected to the DET pin of described temperature sensing circuit U1, and the other end connects the negative pole B-of charging battery core, when the voltage on the capacitor C 2 reaches set point, offers judging unit, plays time-lag action.
Described voltage detecting circuit U2 has: positive source VCC, set pin REST and a grounding pin GND3 pin, wherein: the VCC pin connects the anodal B+ of charging battery core, the GND pin connects the negative pole B-of charging battery core, and the REST pin is as the output connection judgment unit U3 of this voltage detecting circuit U2;
Described judging unit U3 comprises: input A, input B, positive source VCC, grounding pin GND and output Y, wherein, the VCC pin connects the anodal B+ of charging battery core, the GND pin connects the negative pole B-of charging battery core, the A end connects the DET pin of temperature sensing circuit U1, the B end connects the REST pin of voltage detecting circuit U2, and output Y connects the grid of NMOS pipe N1.
The secondary battery protective circuit that the embodiment of the present application provides; when the temperature of rechargeable battery is higher than desired temperature; and when output voltage is higher than voltage setting value; open described self discharge circuit; rechargeable battery discharges by this self discharge circuit; thereby guaranteed the fail safe of rechargeable battery under hot environment, and prolonged the useful life of rechargeable battery.
Preferably, be provided with the thermistor of negative temperature coefficient in the described temperature sensing circuit U1, when the surface temperature that detects described rechargeable battery was higher than the temperature preset value, output signal was low level by the high level upset;
When the voltage that described voltage detecting circuit U2 detects rechargeable battery was higher than voltage setting value, output signal was low level by the high level upset.
Described judging unit U3 specifically can realize by the NOR-logic gate circuit;
Described self discharge circuit 100 comprises: discharge resistance R1, R2 and switching tube N1, wherein, after R1 and R2 are connected in parallel and switching tube N1 be series at the two poles of the earth of rechargeable battery.
Concrete, described switching tube N1 can be by metal-oxide-semiconductor (the Metal Oxide Semiconductor of N raceway groove, metal-oxide semiconductor (MOS)) realizes, the common port that the drain electrode of metal-oxide-semiconductor N1 connects described resistance R 1 and R2 links to each other, R1 is connected the other end and is connected the positive pole of rechargeable battery with R2, the source electrode of metal-oxide-semiconductor N1 connects the negative pole of rechargeable battery, the output of grid connection judgment unit U3.Described resistance R 1 and the electric current that can increase after R2 is in parallel in the self discharge circuit.
Certainly, described switching tube N1 can also pass through triode or IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) realize that the application does not limit this.
Concrete, when temperature sensing circuit U1 output low level, and during described voltage detecting circuit U2 output low level, judging unit output high level signal, so that NMOS pipe N1 conducting, thereby rechargeable battery is discharged by discharge resistance R1, R2, and then guaranteed under high-temperature condition the fail safe of rechargeable battery;
When the temperature of rechargeable battery was lower than described temperature preset value, temperature sensing circuit U1 exported high level, at this moment, no matter whether the voltage of rechargeable battery two interpolars is higher than the voltage preset value, and judging unit U3 all can the output low level signal, at this moment, NMOS pipe N1 turn-offs, and namely the self discharge circuit turn-offs;
When the temperature of rechargeable battery is higher than described temperature preset value, temperature sensing circuit U1 output low level, and when the voltage of rechargeable battery is lower than described voltage preset value, voltage detecting circuit U2 exports high level, judging unit U3 exports high level signal, NMOS pipe N1 turn-offs, and namely the self discharge circuit turn-offs.
The above only is the application's embodiment; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.
Claims (6)
1. a secondary battery protective circuit is characterized in that, comprising: temperature sensing circuit, voltage detecting circuit, judging unit and self discharge circuit, wherein:
Described temperature sensing circuit detects the temperature on described rechargeable battery surface, and offers described judging unit;
Described voltage detecting circuit is connected between the two poles of the earth of described rechargeable battery, detects the output voltage of described rechargeable battery;
The first input end of judging unit links to each other with described temperature sensing circuit, the second input links to each other with described voltage detecting circuit, output links to each other with described self discharge circuit, when the temperature of described rechargeable battery is higher than desired temperature and output voltage and is higher than voltage setting value, the control signal that the described self discharge circuit of output control is opened.
2. secondary battery protective circuit according to claim 1 is characterized in that:
Be provided with the thermistor of negative temperature coefficient in the described temperature sensing circuit, when the temperature that detects described rechargeable battery surface is higher than the temperature preset value, the output low level signal.
3. secondary battery protective circuit according to claim 1 is characterized in that, when the output voltage that described voltage detecting circuit detects described rechargeable battery is higher than voltage setting value, and the output low level signal.
4. secondary battery protective circuit according to claim 1 is characterized in that, described judging unit is the NOR-logic gate circuit.
5. secondary battery protective circuit according to claim 1 is characterized in that, described self discharge circuit comprises: discharge resistance and switching tube, wherein:
One end of described discharge resistance connects the positive pole of described rechargeable battery, and the other end connects the first end of described switching tube, and the second end of described switching tube connects the negative pole of described rechargeable battery, and the control end of described switching tube connects the output of described judging unit.
6. secondary battery protective circuit according to claim 5 is characterized in that, described switching tube is the N slot field-effect transistor, and described first end is that source electrode, control end are grid for drain electrode, the second end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220384390 CN202840563U (en) | 2012-08-03 | 2012-08-03 | Rechargeable battery protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220384390 CN202840563U (en) | 2012-08-03 | 2012-08-03 | Rechargeable battery protective circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202840563U true CN202840563U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220384390 Expired - Lifetime CN202840563U (en) | 2012-08-03 | 2012-08-03 | Rechargeable battery protective circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242251A (en) * | 2013-06-06 | 2014-12-24 | 深圳富泰宏精密工业有限公司 | Battery with temperature protection function |
| CN105098727A (en) * | 2015-08-18 | 2015-11-25 | 珠海市一微半导体有限公司 | Battery protection circuit and method |
| WO2018036206A1 (en) * | 2016-08-22 | 2018-03-01 | 中兴通讯股份有限公司 | Charging control method, device, apparatus and mobile terminal |
| CN108495788A (en) * | 2017-08-28 | 2018-09-04 | 深圳市大疆创新科技有限公司 | Charging system and charging method |
-
2012
- 2012-08-03 CN CN 201220384390 patent/CN202840563U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242251A (en) * | 2013-06-06 | 2014-12-24 | 深圳富泰宏精密工业有限公司 | Battery with temperature protection function |
| CN105098727A (en) * | 2015-08-18 | 2015-11-25 | 珠海市一微半导体有限公司 | Battery protection circuit and method |
| CN105098727B (en) * | 2015-08-18 | 2018-04-13 | 珠海市一微半导体有限公司 | Battery protecting circuit and method |
| WO2018036206A1 (en) * | 2016-08-22 | 2018-03-01 | 中兴通讯股份有限公司 | Charging control method, device, apparatus and mobile terminal |
| CN108495788A (en) * | 2017-08-28 | 2018-09-04 | 深圳市大疆创新科技有限公司 | Charging system and charging method |
| WO2019041100A1 (en) * | 2017-08-28 | 2019-03-07 | 深圳市大疆创新科技有限公司 | Charging system and charging method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |
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| CX01 | Expiry of patent term |