CN106532652A - Protection device and battery protection circuit - Google Patents
Protection device and battery protection circuit Download PDFInfo
- Publication number
- CN106532652A CN106532652A CN201611144220.7A CN201611144220A CN106532652A CN 106532652 A CN106532652 A CN 106532652A CN 201611144220 A CN201611144220 A CN 201611144220A CN 106532652 A CN106532652 A CN 106532652A
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- Prior art keywords
- protection
- electrically connected
- battery
- pin
- fuse
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/044—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a semiconductor device to sense the temperature
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- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a protection device and a battery protection circuit. The protection device is applied to the battery protection circuit; the protection device comprises staked fuse and temperature sensor; the fuse is used for carrying out electric protection on the electrically connected battery protection circuit; and the temperature sensor is used for carrying out temperature protection on the electrically connected battery protection circuit. The protection device is used for the battery protection circuit, electric protection and temperature protection on the electrically connected battery protection circuit can be simultaneously achieved, the space of a battery protection board can be saved and the integration level is improved.
Description
Technical field
The present embodiments relate to cell art, more particularly to a kind of protection device and battery protecting circuit.
Background technology
With the continuous development of science and technology, among various mobile terminal devices have gradually incorporated the life of people, be people with
More easily to live.
Wherein, used as the part that in mobile terminal device can not be or lack, its security performance is more and more concerned for battery.
Battery protecting plate is typically provided in the side of battery, battery protecting plate there are the safeguard measures such as voltage, electric current and temperature protection.Mesh
Before, a thermistor is usually separately provided on battery protecting plate, the thermistor is gathered by voltage acquisition unit
Magnitude of voltage, further according to the default voltage temperature table of comparisons, obtains battery temperature, and whether the mainboard of mobile terminal judges battery temperature
Reach preset temperature, if so, then mainboard control mobile terminal shutdown, otherwise, battery can normally discharge and recharge, hereby it is achieved that battery
Temperature protection.
However, due to being limited by space, the space of battery protecting plate is less and less, thermistor can take battery protecting plate
Area so that in the space of limited battery protecting plate, it is impossible to do more safeguard measures, integrated level is relatively low.
The content of the invention
The present invention provides a kind of protection device and battery protecting circuit, to realize saving the space of battery protecting plate, improves
Integrated level.
In a first aspect, embodiments providing a kind of protection device, it is applied in battery protecting circuit, the protector
Part includes：The fuse being stacked and temperature sensor；
The fuse carries out electric protection for the battery protecting circuit to electrically connecting；
The temperature sensor, carries out temperature protection for the battery protecting circuit to electrically connecting.
Second aspect, the embodiment of the present invention additionally provide a kind of battery protecting circuit, and the circuit includes battery and first party
The protection device that face provides.
The protection device that the present invention is provided includes：The fuse being stacked and temperature sensor, wherein, fuse is used for
Battery protecting circuit to electrically connecting carries out electric protection；Temperature sensor, carries out temperature for the battery protecting circuit to electrically connecting
Degree protection.The protection device that the present invention is provided is applied in battery protecting circuit, can realize the battery protection to electrically connecting simultaneously
Circuit carries out electric protection and temperature protection, and saves the space of battery protecting plate, improves integrated level.
Description of the drawings
Structural representations of the Fig. 1 for the first protection device in the embodiment of the present invention one；
Fig. 2 is a kind of structural representation of the fuse in the embodiment of the present invention one；
Fig. 3 is the structural representation of second protection device in the embodiment of the present invention one；
Fig. 4 is the structural representation of the third protection device in the embodiment of the present invention one；
Fig. 5 is the structural representation of the first battery protecting circuit in the embodiment of the present invention two；
Fig. 6 is the structural representation of second battery protecting circuit in the embodiment of the present invention two；
Fig. 7 is the structural representation of the third battery protecting circuit in the embodiment of the present invention three；
Fig. 8 is the structural representation of the 4th kind of battery protecting circuit in the embodiment of the present invention three.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Embodiment one
A kind of structural representation of protection device that Fig. 1 is provided for the embodiment of the present invention one, the embodiment of the present invention are applicable
In situation about need to be protected to battery by battery protecting circuit.Protection device provided in an embodiment of the present invention is applied to battery
In protection circuit, referring to Fig. 1, the protection device includes：The fuse 101 being stacked and temperature sensor 102.
Wherein, fuse 101 carries out electric protection for the battery protecting circuit to electrically connecting, and temperature sensor 102 is used for
Battery protecting circuit to electrically connecting carries out temperature protection.
In the protection device that the present invention is provided, fuse and temperature sensor are stacked, then the fuse of protection device
Electric protection is carried out to battery protecting circuit, the temperature sensor of protection device carries out temperature protection to battery protecting circuit.Therefore
Protection device is realized simultaneously carries out electric protection and temperature protection to the battery protecting circuit for electrically connecting, and saves battery protecting plate
Space, improve integrated level.
Fig. 2 is a kind of structural representation of fuse provided in an embodiment of the present invention.Referring to Fig. 2, fuse 101 includes：
First fuse F1, the second fuse F2, first resistor R1 and second resistance R2.
Wherein, the first end of the first fuse F1 first end respectively with the second fuse F2, the first end of first resistor R1, with
And the first end electrical connection of second resistance R2, the second end of first resistor R1 and the second end electrical connection of second resistance R2；
The first pin Pin1 of protection device is drawn at second end of the first fuse F1, second end of the second fuse F2 is drawn and protected
Draw the 3rd pin Pin3 of protection device in second end of second pin Pin2 and first resistor R1 of shield device.
Fig. 3 is a kind of structural representation of protection device provided in an embodiment of the present invention.Temperature sensor 102 is stacked
On fuse 101.Optional temperature sensor 102 can be electrically connected with fuse 101, i.e., temperature sensor 102 with
Fuse 101 is independent mutually and is only stacked in structure.Temperature sensor 102 has first end and the second end, and temperature is passed
The first end of sensor 102 draws the 4th pin Pin4 of protection device, and protection device is drawn at the second end of temperature sensor 102
5th pin Pin5, constitutes the protection device with five pins.
Fig. 4 is a kind of structural representation of protection device provided in an embodiment of the present invention.Temperature sensor 102 is stacked
On fuse 101.Optional temperature sensor 102 can also share a pin with fuse 101.Temperature sensor 102 has
The first end for having first end and the second end, temperature sensor 102 can be electrically connected with second end of the first fuse F1 in fuse 101
The first pin Pin1 of protection device is met and draws, the 4th pin of protection device, structure are drawn in the second end of temperature sensor 102
Into the protection device with four pins.
Preferably, temperature sensor 102 is the thermistor with positive temperature coefficient.
It should be noted that the fuse in the present embodiment is the three end fuses for including two fuses and two resistance,
Also optional fuse is the fuse of other structures in other embodiments, such as includes two ends fuse of a fuse etc., this
Invention is not limited to this.
The protection device that the present invention is provided includes：The fuse being stacked and temperature sensor, fuse is for electricity
The battery protecting circuit of connection carries out electric protection；Temperature sensor, enters trip temperature guarantor for the battery protecting circuit to electrically connecting
Shield.Wherein fuse and temperature sensor can be independent mutually or share a pin, constitute protection device.The embodiment of the present invention is carried
For protection device be applied in battery protecting circuit, can realize simultaneously to electrically connect battery protecting circuit carry out electric protection and
Temperature protection, and the space of battery protecting plate is saved, improve integrated level.
Embodiment two
A kind of battery protecting circuit is embodiments provided, the circuit protection circuit includes battery and above-described embodiment
Any protection device of middle offer, wherein, the fuse in protection device is electrically connected with battery, for carrying out electric guarantor to battery
Shield, the temperature sensor of protection device is electrically connected with battery, for carrying out temperature protection to battery.
Fig. 5 is a kind of structural representation of preferred battery protecting circuit provided in an embodiment of the present invention.Referring to Fig. 5, should
Battery protecting circuit includes：Battery 210, protection device 220, the first protection circuit 230, the second protection circuit 240, first switch
Device 250 and second switch device 260.In Fig. 5 protection device 220 by with four pins protection device as a example by, at other
It is also optional using the protection device with five pins in embodiment.
The first end of temperature sensor is electrically connected with 210 positive pole of battery；
The first end of fuse is electrically connected with 210 positive pole of battery, and the second end of fuse is external positive terminal；
The temperature detection end of the first protection circuit 230 is electrically connected with the second end of temperature sensor, the first protection circuit 230
Charge control end electrically connect with the control end of first switch device 250, the first voltage test side of the first protection circuit 230 with
210 positive pole of battery is electrically connected, and the second voltage test side of the first protection circuit 230 is electrically connected with 210 negative pole of battery
The first end of first switch device 250 is electrically connected with the 3rd end of fuse, the second end of first switch device 250
Electrically connect with the negative pole of battery 210；
The first end of second switch device 260 is electrically connected with the negative pole of battery 210, the first control of second switch device 260
End processed is electrically connected with the discharge control terminal of the second protection circuit 240, and the second control end of second switch device 260 is protected with second
The charge control end electrical connection of circuit 240, the 4th end of second switch device 260 is external negative terminals.
The first voltage test side of the second protection circuit 240 is electrically connected with the second end of fuse, second voltage test side
Electrically connect with 210 negative pole of battery, current detecting end is electrically connected with the 4th end of second switch device 260.
Two grades of protection device 220, the first protection circuit 230 and first switch device 250 composition battery protecting circuit are electric
Pond is protected, including voltage protection and temperature protection.Second protection circuit 240 and second switch device 260 constitute the battery protection
The one-level battery protection of circuit, including voltage protection and current protection.
First protection circuit 230 passes through first voltage test side and second voltage test side and detects the voltage of battery 210, also
The temperature of battery 210 can be detected by temperature detection end.When the voltage that the first protection circuit 230 detects battery 210 exceedes
The first voltage threshold value for prestoring, and/or, the temperature for detecting battery 210 by temperature detection end exceedes the preset temperature for prestoring
During threshold value, the Continuity signal of 250 conducting of charge control end output control first switch device of the first protection circuit 230 to first
The control end of switching device 250 is turning on first switch device 250 so that the cathode voltage of battery 210 is added in cathode voltage
The first end of fuse and the 3rd end, then first resistor and second resistance heating, blowing first fuse and the second fuse, battery
210 quit work, so as to realize voltage protection and temperature protection to battery 210.
Temperature protection in the battery protecting circuit that the present embodiment is provided, if exceed with battery temperature in prior art prestoring
Preset temperature threshold value, by mainboard control mobile terminal shutdown temperature protection measure compare, prior art mobile terminal close
In the case of machine, it is impossible to which battery is protected；And battery protecting circuit provided in an embodiment of the present invention is detecting battery 210
Temperature exceed the preset temperature threshold value that prestores after, battery 210 can directly be controlled by blowing first fuse and the second fuse and stopped
Only work, therefore in the case of power-off, still battery 210 can be protected, by protection device 220, the present embodiment is provided
Battery protecting circuit there is more preferable reliability and safety.
When the second protection circuit 240 detects the electricity of battery 210 by first voltage test side and second voltage test side
When pressure is more than the second voltage threshold value for prestoring, the charge control end output control second switch device 260 of the second protection circuit 240
Second control end of the cut-off signal of disconnection to second switch device 260 is stopped to battery with disconnecting second switch device 260
210 charge；When the second protection circuit 240 detects the electricity of battery 210 by first voltage test side and second voltage test side
Force down when the tertiary voltage threshold value for prestoring, the discharge control terminal output control second switch device 260 of the second protection circuit 240
First control end of the cut-off signal of disconnection to second switch device 260 is stopped to battery with disconnecting second switch device 260
210 electric discharges；Exceed prestore pre- when the second protection circuit 240 detects electric current in battery protecting circuit by current detecting end
If during current threshold, if battery 210 is charged state, the charge control end output control second of the second protection circuit 240 is opened
The second control end of the cut-off signal to second switch device 260 that device 260 disconnects is closed to turn off second switch device 260, is stopped
Only battery 210 is charged, if battery 210 is discharge condition, the discharge control terminal output control second of the second protection circuit 240
Switching device 260 disconnect cut-off signal to second switch device 260 the first control end to turn off second switch device 260,
Stopping is discharged to battery 210.Hereby it is achieved that over-pressed, the under-voltage and overcurrent protection to battery 210.
Wherein, second voltage threshold value is less than first voltage threshold value.
Preferably, first switch device 250 is NMOS tube, and second switch device 260 is two NMOS tubes of drain electrode concatenation.
Fig. 6 is a kind of structural representation of battery protecting circuit provided in an embodiment of the present invention.Referring to Fig. 6, in above-mentioned side
In case, optionally, the first protection circuit 230 includes：3rd resistor R3, the protection chips 231 of the first electric capacity C1 and first, first
Protection chip 231 has first voltage detection pin VDD1, second voltage detection pin VSS1, current detecting pin VM1, charging
Controlling switch CO1 and temperature detection pin T；
The first end of 3rd resistor R3 is electrically connected with 210 positive pole of battery, and the second end of 3rd resistor R3 is protected with first respectively
The first end electrical connection of the first voltage detection pin VDD1 and the first electric capacity C1 of shield chip 231；
Second end of the first electric capacity C1, the second voltage protections of detection pin VSS1 and first of the first protection chip 231
The current detecting pin VM1 of chip 231 is electrically connected with 210 negative pole of battery respectively；
The charge control pin CO1 of the first protection chip 231 is electrically connected with the control end of first switch device 250；
The temperature detection pin T of the first protection chip 231 is electrically connected with the second end of temperature sensor.
Specifically, the first protection circuit 230 detects pin VDD1 and the by the first voltage of the first protection chip 231
Two voltage sense pin VSS1 detect the voltage of battery 210, when the voltage of battery 210 is excessive, the of the first protection chip 231
The voltage of one voltage sense pin VDD1 is larger, due to the second voltage detection pin VSS1 and battery of the first protection chip 231
201 negative poles are electrically connected, therefore, the first voltage detection pin VDD1 and second voltage detection pin of the first protection chip 231
The voltage difference of VSS1 is larger, when according to the first 231 first voltage of protection chip detection pin VDD1 and second voltage detection pin
When the voltage difference of VSS1 detects the voltage of battery 210 more than the first voltage threshold value for prestoring, the charging of the first protection chip 231
Controlling switch CO1 exports the control end of high level to first switch device 250, so as to first switch device 250 is turned on, battery
210 cathode voltage is added in first end and the 3rd end of protection device 220 respectively with cathode voltage, then first resistor and second electric
Resistance heating, blowing first fuse and the second fuse, battery 210 quit work, and realize the voltage protection to battery 210.
When the first protection circuit 230 detects the temperature of battery 210 by the temperature detection pin T of the first protection chip 231
When degree is less than the preset temperature threshold value for prestoring, such as passes through voltage and the temperature table of comparisons for prestoring, be obtained temperature detection pin T's
The temperature map relation of voltage and battery 210, so as to battery can be determined by the temperature detection pin T of the first protection chip 231
210 temperature, if determining that the temperature of battery 210 is default higher than what is prestored by the temperature detection pin T of the first protection chip 231
Temperature threshold, the then control of the charge control pin CO1 output high level to first switch device 250 of the first protection chip 231
End, first switch device 250 turn on, then the first fuse and the second fuse are blown, and battery 210 quits work.Hereby it is achieved that right
The temperature protection of battery 210.
In such scheme, optionally, the second protection circuit 240 includes：It is 5th resistance R5, the second electric capacity C2, the 6th electric
The protection chips 241 of resistance R6 and the 7th resistance R7 and the 3rd, the 3rd protection chip 241 have first voltage detection pin VDD3, the
Two voltage sense pin VSS1, current detecting pin VM3, charge control pin CO3 and control of discharge pin DO3；
The first end of the 5th resistance R5 is electrically connected with the second end of fuse, and second end of the 5th resistance R5 is respectively with the 3rd
The first end electrical connection of the first voltage detection pin VDD3 and the second electric capacity C2 of protection chip 241；
Second end of the second electric capacity C2, the second voltage detection VSS3 pins of the 3rd protection chip 241 and the 6th resistance
The first end of R6 is electrically connected with 210 negative pole of battery respectively；
Second end of the 6th resistance R6 is electrically connected with the first end of second switch device 260；
The control of discharge pin DO3 of the 3rd protection chip 241 is electrically connected with the first control end of second switch device 260；
The charge control pin CO3 of the 3rd protection chip 241 is electrically connected with the second control end of second switch device 260, the 3rd protection
The current control pin VM3 of chip 241 is electrically connected with the first end of the 7th resistance R7；
Second end of the 7th resistance R7 is electrically connected with the 4th end of second switch device 260.
Specifically, the second protection circuit 240 detects pin VDD3 and the by the first voltage of the 3rd protection chip 241
Two voltage sense pin VSS3 detect the voltage of battery 210, when the first voltage detection pin according to the first protection chip 241
The voltage difference of VDD3 and second voltage detection pin VSS3 detects the voltage of battery 210 more than the second voltage threshold value for prestoring
When, the charge control pin CO3 of the 3rd protection chip 241 exports the control end of low level to second switch device 260, and second opens
Close device 260 to disconnect stopping charging battery 210.Hereby it is achieved that the overvoltage protection to battery 210.
When the second protection circuit 240 detects pin VDD3 and second voltage by the first voltage of the 3rd protection chip 241
When detection pin VSS3 detects the voltage of battery 210 less than the tertiary voltage threshold value for prestoring, the electric discharge of the 3rd protection chip 241
Controlling switch DO3 exports the control end of low level to second switch device 260, and second switch device 260 disconnects stopping battery
210 electric discharges.Hereby it is achieved that the under-voltage protection to battery 210.
When electric current in battery protecting circuit is excessive, the 3rd protection chip 241 current detecting pin VM3 voltage compared with
Greatly, when the second protection circuit 240 is detected in battery protecting circuit by the current detecting pin VM3 of the 3rd protection chip 241
Electric current when exceeding the predetermined current threshold for prestoring, if present battery 210 is charged state, the 3rd protection chip 241 fills
Electric control pin CO3 exports the second control end of low level to second switch device 260, and second switch device 260 disconnects stopping
Only battery 210 is charged；If present battery 210 is discharge condition, the control of discharge pin DO3 of the 3rd protection chip 241 is defeated
Go out the first control end of low level to second switch device 260, second switch device 260 disconnects and discharging to stop battery 210.By
This, realizes the overcurrent protection to battery 210.
The technical scheme of the embodiment of the present invention, by protection device is provided with battery protecting circuit, realizes to battery
Electric protection and temperature protection, and battery protecting circuit provided in an embodiment of the present invention battery temperature exceed preset temperature threshold value
When, battery can directly be controlled by fuse and quit work, in the case where battery shuts down, still can enter trip temperature guarantor to battery
Shield, more safety and reliability.
Embodiment three
Fig. 7 is a kind of structural representation of battery protecting circuit provided in an embodiment of the present invention.Referring to Fig. 7, the battery is protected
Any protection device 320 that protection circuit is provided in including battery 310 and above-described embodiment, wherein, the fusing in protection device 320
Device is electrically connected with battery 310, and for electric protection is carried out to battery 310, the temperature sensor of protection device 320 is electric with battery 310
Connection, for carrying out temperature protection to battery 310.The battery protecting circuit also includes：First protection circuit 330, second is protected
Circuit 340, second switch device 350, the 3rd switching device 360, the 4th switching device 370 and the 4th resistance R4；
The first end of temperature sensor is electrically connected with 310 positive pole of battery；
The first end of fuse is electrically connected with 310 positive pole of battery, and the second end of fuse is external positive terminal；
The charge control end of the first protection circuit 330 is electrically connected with the control end of the 3rd switching device 360, the first protection electricity
The first voltage test side on road 330 is electrically connected with 310 positive pole of battery, second voltage test side and the electricity of the first protection circuit 330
Pond 310 negative pole electrical connection；
The first end of the 3rd switching device 360 is electrically connected with the 3rd end of fuse, the second end of the 3rd switching device 360
Electrically connect with the negative pole of battery 310；
The first end of the 4th resistance R4 is electrically connected with the second end of temperature sensor, second end of the 4th resistance R4 and battery
310 negative pole electrical connection；
The control end of the 4th switching device 370 is electrically connected with the first end of the 4th resistance R4, and the of the 4th switching device 370
One end is electrically connected with the second end of fuse, and the second end of the 4th switching device 370 is electrically connected with the negative pole of battery 310；
The first end of second switch device 350 is electrically connected with the negative pole of battery 310, the first control of second switch device 350
End processed is electrically connected with the discharge control terminal of the second protection circuit 340, and the second control end of second switch device 350 is protected with second
The charge control end electrical connection of circuit 340, the 4th end of second switch device 350 is external negative terminals；
The first voltage test side of the second protection circuit 340 is electrically connected with the second end of fuse, second voltage test side
Electrically connect with 310 negative pole of battery, current detecting end is electrically connected with the 4th end of second switch device 350.
Protection device 320, the first protection circuit 330, the 3rd switching device 360, the 4th switching device 370 and the 4th resistance
The secondary battery protection of battery protecting circuit is constituted, including voltage protection and temperature protection.Second protection circuit 340 and second is opened
Close the one-level battery protection that device 350 constitutes the battery protecting circuit, including voltage protection and current protection.
When the first protection circuit 330 detects the electricity of battery 310 by first voltage test side and second voltage test side
During four voltage threshold that pressure prestores, the 3rd switching device 360 of charge control end output control of the first protection circuit 330 is turned on
Continuity signal to turn on the 3rd switching device, so as to cathode voltage and the cathode voltage of battery 310 are added in the first of fuse
End and the 3rd end, first resistor and second resistance heating, blowing first fuse and the second fuse, battery 310 quit work.By
This, realizes voltage protection and the temperature protection to battery 310.
When the temperature of battery 310 is less than preset temperature threshold value, the resistance of temperature sensor is less, then the 4th resistance R4
First terminal voltage is higher, and the 4th switching device 370 disconnects, 310 normal work of battery；When the temperature of battery 310 is higher, temperature
The resistance of sensor is larger, then first terminal voltage of the 4th resistance R4 is relatively low, and the 4th switching device 370 is turned on, and battery 310 is just
Pole tension and cathode voltage are added in the first end of fuse and the second end respectively, so as to the first fuse and the second fuse are due to electric current
Excessive and fuse, battery 310 quits work.Hereby it is achieved that the temperature protection to battery 310.
Preferably, two NMOS tubes of the second switch device 350 for drain electrode concatenation, the 3rd switching device 360 is NMOS tube,
4th switching device 370 is PMOS.
Fig. 8 is a kind of structural representation of battery protecting circuit provided in an embodiment of the present invention.Referring to Fig. 8, in above-mentioned side
In case, optionally, the first protection circuit 330 includes：3rd resistor R3, the protection chips 331 of the first electric capacity C1 and second, second
Protection chip 331 has first voltage detection pin VDD2, second voltage detection pin VSS2, current detecting pin VM2 and fills
Electric control pin CO2；
The first end of 3rd resistor R3 is electrically connected with 310 positive pole of battery, and the second end of 3rd resistor R3 is protected with second respectively
The first end electrical connection of the first voltage detection pin VDD2 and the first electric capacity C1 of shield chip 331；
Second end of the first electric capacity C1, the second voltage protections of detection pin VSS2 and second of the second protection chip 331
The current detecting pin VM2 of chip 331 is electrically connected with 310 negative pole of battery respectively；
The charge control pin CO2 of the second protection chip 331 is electrically connected with the control end of the 3rd switching device 360.
Specifically, first voltage test side VDD2 and second of first protection circuit 330 by the second protection chip 331
Voltage detecting end VSS2 detects the voltage of battery 310, if the voltage for detecting battery 310 exceedes the 4th voltage threshold for prestoring,
Then the charge control pin CO2 of the second protection chip 331 exports the control end of high level to the 3rd switching device 360, and the 3rd opens
Close device 360 to turn on, then the cathode voltage of battery 310 and cathode voltage are added in first end and the 3rd end of fuse respectively, the
One resistance and second resistance heating, blowing first fuse and the second fuse, battery 310 quit work.Hereby it is achieved that to battery
310 overvoltage protection.
In such scheme, optionally, the second protection circuit 340 includes：It is 5th resistance R5, the second electric capacity C2, the 6th electric
The protection chips 341 of resistance R6 and the 7th resistance R7 and the 3rd, the 3rd protection chip 341 have first voltage detection pin VDD3, the
Two voltage sense pin VSS1, current detecting pin VM3, charge control pin CO3 and control of discharge pin DO3；
The first end of the 5th resistance R5 is electrically connected with the second end of fuse, and second end of the 5th resistance R5 is respectively with the 3rd
The first end electrical connection of the first voltage detection pin VDD3 and the second electric capacity C2 of protection chip 341；
Second end of the second electric capacity C2, the second voltage detection VSS3 pins of the 3rd protection chip 341 and the 6th resistance
The first end of R6 is electrically connected with 310 negative pole of battery respectively；
Second end of the 6th resistance R6 is electrically connected with the first end of second switch device 350；
The control of discharge pin DO3 of the 3rd protection chip 341 is electrically connected with the first control end of second switch device 350；
The charge control pin CO3 of the 3rd protection chip 341 is electrically connected with the second control end of second switch device 350, the 3rd protection
The current control pin VM3 of chip 341 is electrically connected with the first end of the 7th resistance R7；
Second end of the 7th resistance R7 is electrically connected with the 4th end of second switch device 350.
It is made up of the second protection circuit 340 and second switch device 350 in the battery protecting circuit that the present embodiment is provided
In one-level battery protection, voltage protection is identical with the one-level battery protection principle in above-described embodiment with the principle of current protection, can
Referring to the battery protecting circuit provided in above-described embodiment, repeat no more in the present embodiment.
The technical scheme of the embodiment of the present invention, by protection device is provided with battery protecting circuit, while realizing electricity
The electric protection in pond and temperature protection, and battery protecting circuit provided in an embodiment of the present invention exceedes preset temperature threshold in battery temperature
During value, battery can directly be controlled by fuse and quit work, in the case where battery shuts down, still can enter trip temperature guarantor to battery
Shield, more safety and reliability.
Any protection device that protection device in above-mentioned battery protecting circuit is provided for above-described embodiment, possesses above-mentioned guarantor
The corresponding functional module of shield device and beneficial effect.Ins and outs of detailed description in embodiments of the present invention, not can be found in this
The protection device provided by inventive embodiments one.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (12)
1. a kind of protection device, it is characterised in that be applied in battery protecting circuit, the protection device includes：It is stacked
Fuse and temperature sensor, the fuse carry out electric protection for the battery protecting circuit to electrically connecting；
The temperature sensor, carries out temperature protection for the battery protecting circuit to electrically connecting.
2. protection device according to claim 1, it is characterised in that the fuse includes：First fuse, second are melted
Silk, first resistor and second resistance；
Wherein, the first end of first fuse first end respectively with second fuse, the first end of the first resistor,
And the first end of the second resistance is electrically connected, the second end of the first resistor and the second end of the second resistance are electrically connected
Connect；
The first pin of the protection device is drawn at second end of first fuse, institute is drawn at the second end of second fuse
Draw the 3rd pin of the protection device in the second end for stating the second pin and the first resistor of protection device.
3. protection device according to claim 1, it is characterised in that the temperature sensor has first end and second
The 4th pin of the protection device is drawn at end, the first end of the temperature sensor, and the second end of the temperature sensor is drawn
Go out the 5th pin of the protection device.
4. protection device according to claim 2, it is characterised in that the temperature sensor has first end and second
End, the first end of the temperature sensor are electrically connected with the second end of first fuse and draw the first of the protection device
Pin, the second end of the temperature sensor draw the 4th pin of the protection device.
5. a kind of battery protecting circuit, including：Battery and the protection device as described in claim 1-4 is arbitrary；
The fuse of the protection device is electrically connected with the battery, for carrying out electric protection to the battery；
The temperature sensor of the protection device is electrically connected with the battery, for carrying out temperature protection to the battery.
6. battery protecting circuit according to claim 5, it is characterised in that also include：First protection circuit, the second protection
Circuit, first switch device and second switch device；
The first end of the temperature sensor is electrically connected with the anode；
The first end of the fuse is electrically connected with the anode, and the second end of the fuse is external positive terminal
End；
The temperature detection end of first protection circuit is electrically connected with the second end of the temperature sensor, the first protection electricity
The charge control end on road is electrically connected with the control end of the first switch device, the first voltage detection of first protection circuit
End is electrically connected with anode, and the second voltage test side of first protection circuit is electrically connected with the GND；
The first end of the first switch device is electrically connected with the 3rd end of the fuse, and the second of the first switch device
End is electrically connected with the negative pole of the battery；
The first end of the second switch device is electrically connected with the negative pole of the battery, the first control of the second switch device
End is electrically connected with the discharge control terminal of second protection circuit, the second control end of the second switch device and described second
The charge control end electrical connection of protection circuit, the 4th end of the second switch device is external negative terminals.
The first voltage test side of second protection circuit is electrically connected with the second end of the fuse, second voltage test side
Electrically connect with the GND, current detecting end is electrically connected with the 4th end of the second switch device.
7. battery protecting circuit according to claim 6, it is characterised in that first protection circuit includes：3rd is electric
There is first voltage detection pin, second voltage detection to draw for resistance, the first electric capacity and the first protection chip, the first protection chip
Pin, current detecting pin, charge control pin and temperature detection pin；
The first end of 3rd resistor is electrically connected with the anode, and core is protected with described first respectively in the second end of 3rd resistor
The first end electrical connection of the first voltage detection pin and first electric capacity of piece；
Second end of first electric capacity, the second voltage detection pin of the first protection chip and first protection
The current detecting pin of chip is electrically connected with the GND respectively；
The charge control pin of the first protection chip is electrically connected with the control end of the first switch device；
The temperature detection pin of the first protection chip is electrically connected with the second end of the temperature sensor.
8. battery protecting circuit according to claim 5, it is characterised in that also include：First protection circuit, the second protection
Circuit, second switch device, the 3rd switching device, the 4th switching device and the 4th resistance；
The first end of the temperature sensor is electrically connected with the anode；
The first end of the fuse is electrically connected with the anode, and the second end of the fuse is external positive terminal
End；
The charge control end of first protection circuit is electrically connected with the control end of the 3rd switching device, first protection
The first voltage test side of circuit is electrically connected with the anode, the second voltage test side of first protection circuit and institute
State GND electrical connection；
The first end of the 3rd switching device is electrically connected with the 3rd end of the fuse, and the second of the 3rd switching device
End is electrically connected with the negative pole of the battery；
The first end of the 4th resistance is electrically connected with the second end of the temperature sensor, the second end of the 4th resistance with
The negative pole electrical connection of the battery；
The control end of the 4th switching device is electrically connected with the first end of the 4th resistance, and the of the 4th switching device
One end is electrically connected with the second end of the fuse, and the second end of the 4th switching device is electrically connected with the negative pole of the battery
Connect；
The first end of the second switch device is electrically connected with the negative pole of the battery, the first control of the second switch device
End is electrically connected with the discharge control terminal of second protection circuit, the second control end of the second switch device and described second
The charge control end electrical connection of protection circuit, the 4th end of the second switch device is external negative terminals；
The first voltage test side of second protection circuit is electrically connected with the second end of the fuse, second voltage test side
Electrically connect with the GND, current detecting end is electrically connected with the 4th end of the second switch device.
9. battery protecting circuit according to claim 8, it is characterised in that first protection circuit includes：3rd is electric
There is first voltage detection pin, second voltage detection to draw for resistance, the first electric capacity and the second protection chip, the second protection chip
Pin, current detecting pin and charge control pin；
The first end of the 3rd resistor is electrically connected with the anode, and the second end of 3rd resistor is protected with described second respectively
The first end electrical connection of the first voltage detection pin and first electric capacity of shield chip；
Second end of first electric capacity, the second voltage detection pin of the second protection chip and second protection
The current detecting pin of chip is electrically connected with the GND respectively；
The charge control pin of the second protection chip is electrically connected with the control end of the 3rd switching device.
10. the battery protecting circuit according to claim 6 or 8, it is characterised in that second protection circuit includes：The
Five resistance, the second electric capacity, the 6th resistance and the 7th resistance and the 3rd protection chip, the 3rd protection chip have first voltage
Detection pin, second voltage detection pin, current detecting pin, charge control pin and control of discharge pin；
The first end of the 5th resistance is electrically connected with the second end of the fuse, the second end of the 5th resistance respectively with
The first end electrical connection of the first voltage detection pin and second electric capacity of the 3rd protection chip；
Second end of second electric capacity, the second voltage detection pin of the 3rd protection chip and the 6th resistance
First end electrically connect with the GND respectively；
Second end of the 6th resistance is electrically connected with the first end of the second switch device；
The control of discharge pin of the 3rd protection chip is electrically connected with the first control end of the second switch device；Described
The charge control pin of three protection chips is electrically connected with the second control end of the second switch device, the 3rd protection chip
Current control pin electrically connect with the first end of the 7th resistance；
Second end of the 7th resistance is electrically connected with the 4th end of the second switch device.
11. battery protecting circuits according to claim 6, it is characterised in that the first switch device be NMOS tube, institute
State two NMOS tubes that second switch device is drain electrode concatenation.
12. battery protecting circuits according to claim 8, it is characterised in that the second switch device is drain electrode concatenation
Two NMOS tubes, the 3rd switching device be NMOS tube, the 4th switching device be PMOS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611144220.7A CN106532652A (en) | 2016-12-13 | 2016-12-13 | Protection device and battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611144220.7A CN106532652A (en) | 2016-12-13 | 2016-12-13 | Protection device and battery protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN106532652A true CN106532652A (en) | 2017-03-22 |
Family
ID=58343278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611144220.7A Pending CN106532652A (en) | 2016-12-13 | 2016-12-13 | Protection device and battery protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN106532652A (en) |
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| CN110994561A (en) * | 2019-04-30 | 2020-04-10 | 宁德时代新能源科技股份有限公司 | Battery safety protection system and processing method |
| CN113049970A (en) * | 2021-03-19 | 2021-06-29 | 东莞新能德科技有限公司 | Battery protection plate, battery and detection method |
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Application publication date: 20170322 |
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