CN206099317U - Battery protection circuit and terminal - Google Patents
Battery protection circuit and terminal Download PDFInfo
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- CN206099317U CN206099317U CN201620992573.1U CN201620992573U CN206099317U CN 206099317 U CN206099317 U CN 206099317U CN 201620992573 U CN201620992573 U CN 201620992573U CN 206099317 U CN206099317 U CN 206099317U
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- battery
- protection circuit
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- electrically connected
- voltage
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Abstract
The embodiment of the utility model provides a battery protection circuit and terminal, protection circuit include first protection circuit, second protection circuit. The second protection circuit includes: detecting element is with battery electric connection for detect the magnitude of voltage or the current value of battery, and export enable signal according to magnitude of voltage or current value, the switch element is with detecting element and protected location electric connection for receive enable signal, and according to the off state that opens that enable signal changes the switch element, open off state and include on -state and off -state, the protected location is with switch element electric connection, if the switch is in on -state, the protected location starts, if the switch is in off -state, the protected location does not start. This battery protection circuit has increased the second protection circuit on the basis of first protection circuit, the second protection circuit can prevent effectively that the battery from behind first protection circuit malfunction, appearing overflowing or phenomenon such as excessive pressure, has realized the duplicate protection to the battery.
Description
Technical field
The utility model is related to electronic technology field, more particularly to a kind of battery protecting circuit and terminal.
Background technology
Battery is also known as secondary cell, and its species is various, including lithium ion battery, nickel-cadmium battery and Ni-MH battery etc.
Deng.Battery is widely used to various product, such as notebook computer, mobile phone, electric tool, electric automobile etc..Electricity
Pond has the advantages that economic, environmental protection, electricity are sufficient, it is high-power to be adapted to, uses for a long time.If improper use may make to battery
Into the infringement of unrepairable, or even injury can be brought to user.For example, if battery is reversed, its negative pressure for being formed may wear
Power supply chip, not self-healing damage is caused to battery.If battery over-discharge, the damage of unrepairable can be in itself caused to battery
Evil, has had a strong impact on the service life of battery.
At present, battery protection chip is predominantly embedded in the protection circuit for the protection circuit of battery, protected by battery
Shield chip is realized carrying out battery additives for overcharge protection, over, electric discharge overcurrent protection and short-circuit protection etc..Actually used
During, the electronic devices and components in this protection circuit occur unavoidably failure phenomenon, and then cause whole protection circuit to fail,
Great hidden danger is brought to the use of battery.Therefore, it is badly in need of a kind of battery protecting circuit with double protection functions, first
Remain to effectively prevent battery from the phenomenons such as excessively stream or overvoltage occur after protection circuit failure, to strengthen the protection to battery.
Utility model content
The utility model embodiment provides a kind of battery protecting circuit and terminal, including dual-protection circuit, protects first
Remain to effectively prevent battery from the phenomenons such as excessively stream or overvoltage occur after protection circuit failure.
A kind of battery protecting circuit, the protection circuit includes the first protection circuit, the second protection circuit, and described first protects
Protection circuit, the second protection circuit are electrically connected with the battery；First protection circuit is used to detect the voltage of the battery
Value and current value, and control the magnitude of voltage of the battery with current value within preset range；Second protection circuit includes：
Detector unit, is electrically connected with, for detecting the magnitude of voltage or current value of the battery, and according to institute with the battery
State magnitude of voltage or current value output enables signal；
Switch element, is electrically connected with, for receiving the enable signal, and root with the detector unit and protection location
Change the on off state of the switch element according to the enable signal, the on off state includes conducting state and cut-off state；
Protection location, is electrically connected with the switch element；If the switch is in the conduction state, the protection location is opened
It is dynamic；If the switch is in cut-off state, the protection location does not start.
A kind of terminal, the terminal includes battery, and the protection circuit that the utility model embodiment is provided, the protection
Circuit is electrically connected at the battery.
A kind of battery protecting circuit and terminal that the utility model embodiment is provided, the protection circuit is in the first protection electricity
The second protection circuit is increased on the basis of road.The magnitude of voltage that second protection circuit draws according to detector unit detection
Or current value, output enable signal.According to the enable signal, the on off state of the switch element carries out corresponding change
Change, and then change the working condition of the protection location.Second protection circuit can effectively prevent battery in the first protection
After circuit malfunction, occur the phenomenons such as excessively stream or overvoltage during charge and discharge.
Description of the drawings
In order to be illustrated more clearly that the utility model embodiment technical scheme, below will be to make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the present utility model, for
For those of ordinary skill in the art, on the premise of not paying creative work, can be obtaining other according to these accompanying drawings
Accompanying drawing.
A kind of schematic diagram of battery protecting circuit that Figure 1A and Figure 1B is provided for the utility model preferred embodiment；
A kind of schematic diagram of battery protecting circuit that Fig. 2A and Fig. 2 B are provided for another preferred embodiment of the utility model；
A kind of schematic diagram of battery protecting circuit that Fig. 3 A and Fig. 3 B are provided for another preferred embodiment of the utility model；
Fig. 4 is a kind of structural representation of the terminal provided in the utility model preferred embodiment.
Accompanying drawing is identified
The protection circuit of 110 battery 120 first
The detector unit of 130 second protection circuit 131
The protection location of 132 switch element 133
The current detecting unit of 1311 voltage detection unit 1312
P+Input port P-Output port
R1 resettable fuse U1 field-effect transistors
The terminal of U2 bipolar transistors 210
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe.Obviously, described embodiment is a part of embodiment of the utility model, rather than the enforcement of whole
Example.Based on the embodiment in the utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment for obtaining, belongs to the scope of the utility model protection.
Figure 1A and Figure 1B is refer to, a kind of its protection circuit of battery 110 provided for the utility model preferred embodiment
Schematic diagram.The protection circuit includes the first protection circuit, the second protection circuit, first protection circuit, the second protection electricity
Road is electrically connected with the battery；First protection circuit is used to detect the magnitude of voltage and current value of the battery, and controls
The magnitude of voltage of the battery is with current value within preset range.
In being embodied as, first protection circuit 120 can be lived using existing protection circuit and protect chip, for example
First protection circuit 120 can adopt model S-8241AAAMC chip, the chip include overcharge voltage detector unit,
Excessive current detection unit, overdischarge pressure detector unit, short detection unit 131 etc., the chip with peripheral circuit by coordinating
Can be formed and complete to obtain protection circuit.If being embedded in the chip in first protection circuit 120, you can electricity described in automatic detection
There are the actions such as overcharge, overdischarge, peripheral circuit short circuit during charging and discharging in pond 110, and drives corresponding electronic device
Work so that the magnitude of voltage that the battery 110 keeps is maintained within preset range with current value, prevents the battery 110 from going out
The phenomenons such as existing overcharge, overdischarge, short circuit.
Wherein, second protection circuit includes：
Detector unit, is electrically connected with, for detecting the magnitude of voltage or current value of the battery, and according to institute with the battery
State magnitude of voltage or current value output enables signal.
Switch element, is electrically connected with, for receiving the enable signal, and root with the detector unit and protection location
Change the on off state of the switch element according to the enable signal, the on off state includes conducting state and cut-off state.
Protection location, is electrically connected with the switch element；If the switch is in the conduction state, the protection location is opened
It is dynamic；If the switch is in cut-off state, the protection location does not start.
Further, if the detector unit 131 detects the magnitude of voltage for obtaining or current value in default threshold range
Within, the on off state is cut-off state, if the detector unit 131 detects the magnitude of voltage for obtaining or current value not pre-
If threshold range within, the on off state be conducting state.
In being embodied as, the input port P in charging process+With output port P-Between access and provided for the battery 110
The charge power supply of electric energy；In discharge process, input port P+With output port P-Between access it is electric to consume the battery 110
The load of energy.
If the battery 110 is during charging and discharging, the electricity of the battery 110 can be caused if protection circuit fails
Pressure value or current value occur abnormal.For example, in discharge process, the battery 110 can constantly decline, if do not protected
Shield, then can cause electric discharge excessively to cause expendable infringement to the battery 110.
In the present embodiment, if working condition of the battery 110 in electric discharge, first protection circuit 120 occurs
During failure, the detector unit 131 in second protection circuit 130 detects the magnitude of voltage or current value of the battery 110, when
When the magnitude of voltage drops to beyond default threshold range, the detector unit 131 exports the enable signal of a high level
To switch element 132, original cut-off state is changed to lead by the switch element 132 according to the enable signal of the high level
Logical state, the protection location 133 starts, and then completes the second protection to the battery 110, to prevent the battery 110
There is overdischarge phenomenon.
Further, the protection location 133 is resettable fuse R1, one end of the resettable fuse R1 and institute
State battery 110 to be electrically connected with, the input port P of the other end and the protection circuit+It is electrically connected with, the resettable fuse R1
The one end being electrically connected with the battery 110 is also electrically connected with the switch element 132.
Wherein, the resettable fuse R1 is a kind of excessively stream electrical protection component, is existed using macromolecule organic polymer
High pressure, high temperature, under conditions of vulcanization reaction, after addition particulate materials, process through special technique.Traditional insurance
Silk overcurrent protection, is only capable of protection once, and having blown needs to change, and resettable fuse R1 has overcurrent and overheating protection, automatically extensive
Multiple dual-use function.
In being embodied as, as one preferably, the resettable fuse R1 can select thermistor, the temperature-sensitive
Resistance includes positive temperature coefficient thermistor (PTC) and negative temperature coefficient thermistor (NTC).Positive temperature coefficient temperature-sensitive electricity
Resistance device (PTC) resistance value when temperature is higher is bigger, and resistance value is more when temperature is higher for negative temperature coefficient thermistor (NTC)
Low, they belong to semiconductor device.For example, when short trouble occurs in circuit, the positive temperature coefficient thermistor is flowed through
(PTC) electric current increase, and then its temperature is constantly increased, when the temperature rises to certain numerical value, the positive temperature
The resistance of coefficient thermal resistor (PTC) close to infinity, equivalent to by circuit breaker, so realize in protection circuit its
His electronic component.After circuit breaker, the reduction of positive temperature coefficient thermistor (PTC) electric current is flowed through, its temperature is with heat
Constantly distribute and be gradually reduced, when the temperature drop is to certain numerical value, the positive temperature coefficient thermistor (PTC)
Resistance close to zero, equivalent to by circuit communication, it is achieved thereby that the self-healing function of fuse.
Fig. 2A and Fig. 2 B are refer to, it protects electricity for a kind of battery 110 that another preferred embodiment of the utility model is provided
The schematic diagram on road.The switch element 132 is field-effect transistor U1, and the detector unit 131 is voltage detection unit 131,
The voltage detection unit 131 is connected in parallel with the battery 110, and grid and the voltage of the field-effect transistor U1 are examined
Survey unit 131 to be electrically connected with, the drain electrode of the field-effect transistor U1 is electrically connected with the resettable fuse R1, the field
The source electrode of effect transistor U1 and protection circuit person's output port P-It is electrically connected with.
The voltage detection unit 131 is used to detect the magnitude of voltage of the battery 110, if the magnitude of voltage is not default
It is described to drain and the source conduction within threshold range, the resettable fuse R1 fusing.
In being embodied as, there is electric voltage exception because first protection circuit 120 breaks down in the battery 110.
The voltage detection unit 131 can detect the magnitude of voltage for obtaining the battery 110, and compare with default voltage threshold, if
The magnitude of voltage for obtaining is detected not within the scope of the voltage threshold, then exports a high electricity to the field-effect transistor U1
Flat enable signal.The FET is received after the enable signal of the high level, the drain electrode and source conduction.It is described
The overwhelming majority of electric current is split, and the electric current being split flows through priority：Input port P+, resettable fuse R1, field-effect
Transistor U1, output port P-.Electric current constantly flows through resettable fuse R1, and the temperature of the resettable fuse R1 constantly rises
Height, after the fusing-off temperature of the resettable fuse R1 is reached up to its temperature, the resettable fuse R1 fusing, so as to keep away
Exempt from electric current and continue flow through battery 110, prevent battery 110 occur electric current it is excessive and cause danger.
Fig. 3 A and Fig. 3 B are refer to, it protects electricity for a kind of battery 110 that another preferred embodiment of the utility model is provided
The schematic diagram on road.The switch element 132 is bipolar transistor U1, and the detector unit 131 is current detecting unit 132,
The current detecting unit 132 is connected in series with the battery 110, and base stage and the electric current of the bipolar transistor U1 are examined
Survey unit 132 to be electrically connected with, the colelctor electrode of the bipolar transistor U1 is electrically connected with the resettable fuse R1, described
The output port P of the emitter stage of bipolar transistor U1 and the protection circuit-It is electrically connected with；
The current detecting unit 132 is used to detect the current value of the battery 110, if the current value is not default
Within threshold range, the colelctor electrode is turned on the emitter stage, the resettable fuse R1 fusing.
In being embodied as, there is current anomaly because first protection circuit 120 breaks down in the battery 110.
The current detecting unit 132 can detect the current value for obtaining the battery 110, and compare with default current threshold, if
The current value for obtaining is detected not within the scope of the current threshold, then exports an electric current to the bipolar transistor U2
Enable signal.The FET is received after the enable signal of the electric current, and the colelctor electrode is turned on emitter stage.It is described
The overwhelming majority of electric current is split, and the electric current being split flows through priority：Input port P+, resettable fuse R1, bipolarity
Transistor U2, output port P-.Electric current constantly flows through resettable fuse R1, and the temperature of the resettable fuse R1 constantly rises
Height, after the fusing-off temperature of the resettable fuse R1 is reached up to its temperature, the resettable fuse R1 fusing, so as to keep away
Exempt from electric current and continue flow through battery 110, prevent battery 110 occur electric current it is excessive and cause danger.
Further, the quantity of the battery 110 is for one or more than one.
In being embodied as, the quantity of the battery 110 is not limited to one, by the difference to multiple batteries 110 simultaneously
Joint inspection is surveyed, and second protection circuit 130 is equally applicable to the protection circuit to multiple batteries 110.
Further, the battery 110 includes nickel-cadmium cell, Ni-MH battery, lithium ion battery and lithium polymer battery.
Fig. 4 is refer to, it is a kind of structural representation of the terminal 210 provided in the utility model preferred embodiment.Institute
Terminal 210 is stated, the terminal 210 includes battery 110, and the protection circuit that the utility model is provided, the protection circuit electricity
Property is connected to the battery 110.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and is not described in certain embodiment
Part, may refer to the associated description of other embodiment.
Unit in the utility model embodiment terminal can according to actual needs be merged, divides and deleted.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any those familiar with the art can readily occur in various in the technical scope that the utility model is disclosed
Equivalent modification or replacement, these modifications or replace all should be covered within protection domain of the present utility model.Therefore, this practicality
New protection domain should be defined by scope of the claims.
Claims (10)
1. a kind of battery protecting circuit, it is characterised in that the protection circuit includes the first protection circuit, the second protection circuit,
First protection circuit, the second protection circuit are electrically connected with the battery；First protection circuit is used to detect described
The magnitude of voltage and current value of battery, and control the magnitude of voltage of the battery with current value within preset range；Described second protects
Protection circuit includes：
Detector unit, is electrically connected with, for detecting the magnitude of voltage or current value of the battery, and according to the electricity with the battery
Pressure value or current value output enable signal；
Switch element, is electrically connected with the detector unit, for receiving the enable signal, and is changed according to the enable signal
Become the on off state of the switch element, the on off state includes conducting state and cut-off state；
Protection location, is electrically connected with the switch element；If the switch is in the conduction state, the protection location starts；
If the switch is in cut-off state, the protection location does not start.
2. protection circuit as claimed in claim 1, it is characterised in that if the detector unit detect the magnitude of voltage that obtains or
Within default threshold range, the on off state is cut-off state to current value, if the detector unit detects what is obtained
Not within default threshold range, the on off state is conducting state for magnitude of voltage or current value.
3. protection circuit as claimed in claim 1, it is characterised in that the protection location is resettable fuse, it is described from
The one end for recovering fuse is electrically connected with the battery, and the other end is electrically connected with the input port of the protection circuit, institute
State one end that resettable fuse is electrically connected with the battery to be also electrically connected with the switch element.
4. protection circuit as claimed in claim 3, it is characterised in that the resettable fuse is thermistor.
5. protection circuit as claimed in claim 4, it is characterised in that the thermistor is semistor.
6. protection circuit as claimed in claim 3, it is characterised in that the switch element is field-effect transistor, the inspection
Survey unit is voltage detection unit, and the voltage detection unit is connected with the cell parallel, the grid of the field-effect transistor
Pole is electrically connected with the voltage detection unit, and the drain electrode of the field-effect transistor electrically connects with the resettable fuse
Connect, the source electrode of the field-effect transistor is electrically connected with protection circuit person's output port；
The voltage detection unit is used to detect the magnitude of voltage of the battery, if the magnitude of voltage not default threshold range it
It is interior, described to drain and the source conduction, the resettable fuse fusing.
7. protection circuit as claimed in claim 3, it is characterised in that the switch element is bipolar transistor, the inspection
Survey unit is current detecting unit, and the current detecting unit is connected in series with the battery, the base of the bipolar transistor
Pole is electrically connected with the current detecting unit, and the colelctor electrode of the bipolar transistor electrically connects with the resettable fuse
Connect, the emitter stage of the bipolar transistor is electrically connected with the output port of the protection circuit；
The current detecting unit is used to detect the current value of the battery, if the current value not default threshold range it
Interior, the colelctor electrode is turned on the emitter stage, the resettable fuse fusing.
8. protection circuit as claimed in claim 1, it is characterised in that the quantity of the battery is or more than.
9. protection circuit as claimed in claim 1, it is characterised in that the battery include nickel-cadmium cell, Ni-MH battery, lithium from
Sub- battery and lithium polymer battery.
10. a kind of terminal, it is characterised in that the terminal includes battery, and as described in claim 1 to 9 any one
Protection circuit, the protection circuit is electrically connected at the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620992573.1U CN206099317U (en) | 2016-08-30 | 2016-08-30 | Battery protection circuit and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620992573.1U CN206099317U (en) | 2016-08-30 | 2016-08-30 | Battery protection circuit and terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206099317U true CN206099317U (en) | 2017-04-12 |
Family
ID=58476914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620992573.1U Active CN206099317U (en) | 2016-08-30 | 2016-08-30 | Battery protection circuit and terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206099317U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918046A (en) * | 2017-10-23 | 2018-04-17 | 宁德时代新能源科技股份有限公司 | Current detection device and battery management system |
| CN111668901A (en) * | 2020-06-17 | 2020-09-15 | 东莞新能安科技有限公司 | Battery protection circuit, battery management system, battery device and control method thereof |
| KR20210044293A (en) * | 2020-06-17 | 2021-04-22 | 동관 파워앰프 테크놀로지 리미티드 | Battery protection circuit, battery management system, battery device, and control method thereof |
-
2016
- 2016-08-30 CN CN201620992573.1U patent/CN206099317U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918046A (en) * | 2017-10-23 | 2018-04-17 | 宁德时代新能源科技股份有限公司 | Current detection device and battery management system |
| US10718797B2 (en) | 2017-10-23 | 2020-07-21 | Contemporary Amperex Technology Co., Limited | Current detecting apparatus and battery management system |
| CN111668901A (en) * | 2020-06-17 | 2020-09-15 | 东莞新能安科技有限公司 | Battery protection circuit, battery management system, battery device and control method thereof |
| KR20210044293A (en) * | 2020-06-17 | 2021-04-22 | 동관 파워앰프 테크놀로지 리미티드 | Battery protection circuit, battery management system, battery device, and control method thereof |
| WO2021253848A1 (en) * | 2020-06-17 | 2021-12-23 | 东莞新能安科技有限公司 | Battery protection circuit, battery management system, and battery device and control method therefor |
| JP2022542721A (en) * | 2020-06-17 | 2022-10-07 | 東莞新能安科技有限公司 | Battery protection circuit, battery management system, battery device and control method thereof |
| CN111668901B (en) * | 2020-06-17 | 2023-04-18 | 东莞新能安科技有限公司 | Battery protection circuit, battery management system, battery device and control method thereof |
| JP7377860B2 (en) | 2020-06-17 | 2023-11-10 | 東莞新能安科技有限公司 | Battery protection circuit, battery management system, battery device and its control method |
| KR102607999B1 (en) * | 2020-06-17 | 2023-12-01 | 동관 파워앰프 테크놀로지 리미티드 | Battery protection circuit, battery management system, battery device and control method thereof |
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| GR01 | Patent grant | ||
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Effective date of registration: 20210318 Address after: 518057 Desai Science and Technology Building, 9789 Shennan Avenue, Yuehai Street, Nanshan District, Shenzhen City, Guangdong Province, 17th Floor (15th Floor of Natural Floor) 1702-1703 Patentee after: Shenzhen Microphone Holdings Co.,Ltd. Address before: 518000 21st floor, Shidai science and technology building, 7028 Shennan Avenue, Futian District, Shenzhen City, Guangdong Province (office only) Patentee before: DONGGUAN GOLDEX COMMUNICATION TECHNOLOGY Co.,Ltd. |