CN209344816U - Lithium battery protection board - Google Patents
Lithium battery protection board Download PDFInfo
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- CN209344816U CN209344816U CN201822005430.9U CN201822005430U CN209344816U CN 209344816 U CN209344816 U CN 209344816U CN 201822005430 U CN201822005430 U CN 201822005430U CN 209344816 U CN209344816 U CN 209344816U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model is suitable for technical field of lithium batteries; a kind of lithium battery protection board is provided, which includes battery pack, the charger end for connecting charger, load end, analog front-end module, single-chip microcontroller, charge-discharge modules and wake-up module for connecting load；Analog front-end module is connect with battery pack；Single-chip microcontroller is connect by bus with analog front-end module；Charge-discharge modules are connect with battery pack, analog front-end module, charger end and load end respectively；Wake-up module is connect with battery pack, analog front-end module, charger end and load end respectively, for when charger end is connect with charger and/or load end is connected with load, wake-up signal is sent to analog front-end module, so that analog front-end module controls charge-discharge modules, charging is carried out to battery pack by charger end with control and/or battery pack discharges to load end.Lithium battery protection board provided by the utility model solves the problems, such as that existing safety is inadequate.
Description
Technical field
The utility model belongs to technical field of lithium batteries more particularly to a kind of lithium battery protection board.
Background technique
With the progress of science and technology and the development of electronic technology, more and more electronic equipments need to be carried out using battery
Power supply uses, and existing battery includes lithium battery, lead-acid battery etc., and wherein lithium battery has energy density compared to traditional lead acid batteries
Greatly, service life length, more environmentally friendly advantage, therefore be widely used.
Existing lithium battery group generallys use hardware lithium battery protection board and protects to it, lithium battery protection board for pair
Serial lithium battery group carries out charge and discharge protecting, so that protecting lithium battery group not over-discharge, not overcharging, not overcurrent and output short-circuit
Protection guarantees that the voltage differences between each single battery are less than setting value when lithium battery is fully charged, realizes that battery pack is each
Single battery fills.
However in existing lithium battery protection board, lithium battery group is in instantaneous operating conditions, when lithium battery protection board not
When connecting charger and load, lithium battery group is not turned off power circuit, there is also voltage output, leads to its safety not
It is enough, or even cause safety accident.
Utility model content
The utility model embodiment provides a kind of lithium battery protection board, it is intended to solve existing lithium battery protection board safety not
Enough problems.
The utility model embodiment proposes a kind of lithium battery protection board, including battery pack, the charging for connecting charger
Device end and for connect load load end, further include analog front-end module, single-chip microcontroller, charge-discharge modules and wake up mould
Block；
The analog front-end module is connect with the battery pack；
The single-chip microcontroller is connect by bus with the analog front-end module, and the single-chip microcontroller is used for according to acquisition
It is equal to battery pack progress electric current to control the analog front-end module for the analog front-end module battery voltage collected
Weighing apparatus control；
The charge-discharge modules respectively with the battery pack, the analog front-end module, the charger end and described negative
End connection is carried, the charge-discharge modules are used for the control signal issued according to the analog front-end module, control by the charging
Device end carries out charging to the battery pack and/or the battery pack discharges to the load end；
The wake-up module respectively with the battery pack, the analog front-end module, the charger end and the load
Connection is held, the wake-up module is used to connect when the charger end with the charger and/or the load end is born with described
When carrying connection, wake-up signal is sent to the analog front-end module, so that the analog front-end module sends the control signal
To the charge-discharge modules, charging and/or the battery pack are carried out to institute to the battery pack by the charger end with control
Load end is stated to discharge.
Further, the wake-up module includes calling out respectively with what the analog front-end module and the battery pack were connect
Awake circuit and the load control circuit and charger control circuit being connect respectively with the wake-up circuit；
The load control circuit is connect with the load end, and the load control circuit is used to work as the load end and institute
When stating load connection, the wake-up circuit work is controlled, so that the wake-up circuit sends the wake-up signal to the simulation
Front-end module is discharged with controlling the battery pack to the load end；
The charger control circuit is connect with the charger end, and the charger control circuit is used to work as the charging
When device end is connect with the charger, the wake-up circuit work is controlled, so that the wake-up circuit sends the wake-up signal
To the analog front-end module, charged by the charger end to the battery pack with control.
Further, the wake-up circuit includes the first resistor connecting respectively with the analog front-end module, first
Triode, the second triode, second resistance, the first diode being connect with first triode and respectively with described second
The 3rd resistor and the second diode of triode connection；
The analog front-end module respectively with described first resistor one end, the collector of first triode, described
The collector of two triodes and the connection of described second resistance one end, the first resistor other end ground connection, first triode
Emitter ground connection, the base stage of first triode respectively with the load control circuit, the charger control circuit and
The cathode of the first diode connects, the emitter of second triode respectively with the charger control circuit and described
The anode connection of second diode, the base stage of second triode are connect with described 3rd resistor one end, the second resistance
The other end is connect with the anode of the battery pack, and the cathode of the plus earth of the first diode, second diode connects
Ground, the 3rd resistor other end ground connection.
Further, the load control circuit include the 4th resistance being connect with the wake-up circuit and respectively with
The 5th resistance and first capacitor of the 4th resistance connection；
The charger control circuit include the 6th resistance being connect with the wake-up circuit, respectively with the 6th resistance
The 7th resistance and the 8th resistance of connection and the 9th resistance being connect with the 8th resistance；
Described 4th resistance one end is connect with the base stage of the first triode described in the wake-up circuit, the 4th resistance
The other end is connect with the 5th resistance and described first capacitor one end respectively, the 5th resistance other end ground connection, and described the
The one capacitor other end is connect with the negative output terminal of the load end；
Described 6th resistance one end is connect with the base stage of the first triode described in the wake-up circuit, the 6th resistance
The other end is connect with the 7th resistance and described 8th resistance one end respectively, the 7th resistance other end ground connection, and described the
The eight resistance other ends are connect with the negative input end of described 9th resistance one end and the charger end respectively, and the 9th resistance is another
One end is connect with the emitter of the second triode described in the wake-up circuit.
Further, the charge-discharge modules include charging circuit, discharge circuit and charger protection circuit；
The charging circuit connects with the battery pack, the analog front-end module and the charger protection circuit respectively
It connects, the charging circuit is used for the control signal issued according to the analog front-end module, controls by the charger end
It charges to the battery pack；
The discharge circuit is connect with the battery pack, the analog front-end module and the load end respectively, described to put
Circuit is used for the control signal that issues according to the analog front-end module, control the battery pack to the load end into
Row electric discharge；
The charger protection circuit is connect with the charging circuit and the charger end respectively, the charger protection
Circuit is used to carry out short-circuit protection to the charger.
Further, the discharge circuit includes the tenth electricity sequentially connecting with described analog front-end module one end respectively
Resistance, electric discharge metal-oxide-semiconductor and the first sampling resistor；
The charging circuit includes the third diode sequentially connecting with the analog front-end module other end respectively, the tenth
One resistance, the first charging metal-oxide-semiconductor, the second charging metal-oxide-semiconductor and the second sampling resistor；
The charger protection circuit includes twelfth resistor and the 4th diode；
The grid of the electric discharge metal-oxide-semiconductor is connect with the tenth resistance, the drain electrode of the electric discharge metal-oxide-semiconductor and the load end
Negative output terminal connection, it is described electric discharge metal-oxide-semiconductor source electrode connect with first sampling resistor one end, first sampling resistor
The other end is connect with the cathode of the battery pack；
The analog front-end module other end is connect with the anode of the third diode, the cathode of the third diode
It is connect with described eleventh resistor one end, the eleventh resistor other end is connect with the grid of the first charging metal-oxide-semiconductor, institute
State the first charging metal-oxide-semiconductor drain electrode with it is described second charging metal-oxide-semiconductor drain electrode connect, it is described second charge metal-oxide-semiconductor grid and
The source electrode of the grid connection of the electric discharge metal-oxide-semiconductor, the second charging metal-oxide-semiconductor is connect with second sampling resistor one end, institute
The second sampling resistor other end is stated to connect with the cathode of the battery pack；
The both ends of the twelfth resistor and the 4th diode are connected in parallel to grid and the source of the first charging metal-oxide-semiconductor
The both ends of pole, the anode of the 4th diode and the source electrode of the first charging metal-oxide-semiconductor and the negative input end of the charging end
Connection, the cathode of the 4th diode are connect with the grid of the first charging metal-oxide-semiconductor.
Further, the lithium battery protection board further includes power consumption control module, the power consumption control module with it is described
Analog front-end module is connected with the single-chip microcontroller, for reducing the power consumption of the single-chip microcontroller.
Further, the power consumption control module include thirteenth resistor, it is the first metal-oxide-semiconductor, the 14th resistance, controllable steady
Potential source, the 15th resistance and the second capacitor；
Described analog front-end module one end connects with the source electrode of described thirteenth resistor one end and first metal-oxide-semiconductor respectively
It connects, the thirteenth resistor other end is connect with the grid of first metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and described the
14 resistance one end connection, the 14th resistance other end respectively with described 15th resistance one end and the controllable pressure stabilizing
The cathode in source is connected with reference to pole, the plus earth of the controllable source of stable pressure, the 15th resistance other end respectively with it is described
Second capacitor one end is connected with the single-chip microcontroller, the second capacitor other end ground connection.
Lithium battery protection board provided by the utility model, since setting charge-discharge modules to charge to battery pack
Perhaps the control discharged may make its lithium battery protection board and any charger or load to connect by the way that wake-up module is arranged
When, lithium battery protection board wakes up control battery pack and restores to working condition, to realize to load discharge or be carried out by charger
Charging；And lithium battery protection board then closes battery power circuit, stops voltage output when not connecting with charger or load,
So that increasing the security performance of lithium battery protection board, solve the problems, such as that existing lithium battery protection board safety is inadequate.
Detailed description of the invention
Fig. 1 is the module map for the lithium battery protection board that an embodiment of the utility model provides；
Fig. 2 is the module map for the lithium battery protection board that a preferred embodiment of the utility model provides；
Fig. 3 is the structure of analog front-end module in the lithium battery protection board of the preferred embodiment offer of the utility model
Figure；
Fig. 4 is the circuit that connect with wake-up module in lithium battery protection board that a preferred embodiment of the utility model provides
Figure；
Fig. 5 is the electricity that connect with charge-discharge modules in lithium battery protection board that a preferred embodiment of the utility model provides
Lu Tu；
Fig. 6 be the utility model a preferred embodiment provide lithium battery protection board in connect with power consumption control module
Circuit diagram.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Lithium battery protection board provided by the utility model includes battery pack, the charger end for connecting charger, is used for
Connect load end, analog front-end module, single-chip microcontroller, charge-discharge modules and the wake-up module of load.Analog front-end module and electricity
The connection of pond group；Single-chip microcontroller is connect by I2C bus with analog front-end module；Charge-discharge modules respectively with battery pack, AFE(analog front end)
Module, charger end and load end connection；Wake-up module respectively with battery pack, analog front-end module, charger end and load
End connection, for when charger end connect with charger and/or load end and load connect when, send wake-up signal extremely simulation before
End module carries out charging and/or electricity to battery pack by charger end with control so that analog front-end module controls charge-discharge modules
Pond group discharges to load end, and lithium battery protection board can completely close power circuit when not connecting with charger or load,
There is no voltage output, and when connecting any charger or load, it can be connected and restore battery pack work, improve lithium battery guarantor
The safety of backplate.
Embodiment one
It is as shown in Figure 1 the module map of lithium battery protection board provided by the embodiment of the utility model.
Lithium battery protection board provided by the utility model, charger end 30 including battery pack 20, for connecting charger,
For connecting load end 40, analog front-end module 50, single-chip microcontroller 60, charge-discharge modules 70 and the wake-up module 80 of load.
Wherein, analog front-end module 50 is connect with battery pack 20；Single-chip microcontroller 60 passes through I2C bus and analog front-end module 50
Connection, wherein single-chip microcontroller 60 is used for 20 voltage of battery pack collected of analog front-end module 50 according to acquisition, before control simulation
End module 50 carries out current balance control to battery pack 20；Charge-discharge modules 70 respectively with battery pack 20, analog front-end module 50,
Charger end 30 and load end 40 connect, and charge-discharge modules 70 are used for the control signal issued according to analog front-end module 50, control
System carries out charging to battery pack 20 by charger end 30 and/or battery pack 20 discharges to load end 40；Wake-up module 80 is divided
It is not connect with battery pack 20, analog front-end module 50, charger end 30 and load end 40, wake-up module 80 is for working as charger
When end 30 is connect with charger and/or load end 40 is connected with load, wake-up signal is sent to analog front-end module 50, so that mould
Quasi- front-end module 50 sends a control signal to charge-discharge modules 70, is charged by charger end 30 to battery pack 20 with control
And/or battery pack 20 discharges to the load end 40.
The lithium battery protection board that the utility model embodiment passes through, by the charge-discharge modules of setting can to battery pack into
The control of row charge or discharge may make its lithium battery protection board and any charger or load by the way that wake-up module is arranged
When connection, lithium battery protection board control battery pack is restored to working condition, to realize to load discharge or be carried out by charger
Charging；And lithium battery protection board not with charger or load connect when, close battery power circuit, stop voltage output, make
The security performance of lithium battery protection board must be increased.
Embodiment two
The module map of the lithium battery protection board of the preferred embodiment in the utility model offer is provided.Its realization principle
And the technical effect and embodiment one generated is identical, to briefly describe, the utility model embodiment does not refer to place, can refer to reality
Apply corresponding contents in example one.
Difference from the first embodiment is that specifically, wake-up module 80 include respectively with analog front-end module 50 and electricity
The wake-up circuit 81 that pond group 20 connects and the load control circuit 82 and charger control circuit being connect respectively with wake-up circuit 81
83。
Specifically, charge-discharge modules 70 include charging circuit 71, discharge circuit 72 and charger protection circuit 73.
Specifically, lithium battery protection board further includes power consumption control module 90, the power consumption control module 90 and AFE(analog front end) mould
Block 50 and single-chip microcontroller 60 connect, for reducing the power consumption of single-chip microcontroller 60.
Wherein, in one embodiment of the utility model, the positive B+ of the battery pack 20 respectively with charger end 30
Positive input terminal C+ is connected with the positive output end P+ of load end 40, positive B+, the cathode B- of battery pack 20 respectively with AFE(analog front end)
The positive input terminal of module 50, negative input end connection.
In one embodiment of the utility model, as shown in figure 3, the intersil that the analog front-end module 50 uses is public
The ISL9208 chip of department comprising 32 pins, it is steady that analog front-end module 50 can provide overcurrent protection, short-circuit protection, 3.3V
Pressure, battery balanced control, cell voltage conversion, temperature detection and charge and discharge FET driving function, analog front-end module 50 are wrapped
Include balancing control circuit, voltage acquisition detection circuit, voltage regulator circuit and charge and discharge electric drive circuit etc.；Wherein Balance route electricity
Road is connect with battery pack 20, the electric current for Balance route battery pack 20；Voltage acquisition detection circuit respectively with battery pack 20 and
Single-chip microcontroller 60 connects, for acquiring the voltage of battery pack 20 and being sent to 60 plate of single-chip microcontroller；Voltage regulator circuit is connect with single-chip microcontroller 60,
For providing stabilized supply voltage for single-chip microcontroller 60；Charge and discharge electric drive circuit is connect with charge-discharge modules 70, for driving charge and discharge
Electric module 70 works.
In one embodiment of the utility model, which includes wake-up circuit 81, load control circuit 82
With charger control circuit 83, wherein load control circuit 82 is connect with load end 40, and load control circuit 82 is used for when load
When end 40 is connected with load, control wake-up circuit 81 works, so that wake-up circuit 81 sends wake-up signal to analog front-end module
50, it is discharged with controlling battery pack 20 to load end 40；
Charger control circuit 83 is connect with charger end 30, and charger control circuit 83 is used to work as charger end 30 and fill
When electric appliance connects, control wake-up circuit 81 works, so that wake-up circuit 81 sends wake-up signal to analog front-end module 50, with control
System charges to battery pack 20 by charger end 30.
Further, as shown in figure 4, in one embodiment of the utility model, wake-up circuit 81 include respectively with simulation
First resistor R1 that front-end module 50 connects, the first triode Q1, the second triode Q2, second resistance R2, respectively with the one or three
The first diode D1 of pole pipe Q1 connection and respectively with the second triode Q2 the 3rd resistor R3 connecting and the second diode D2；
Load control circuit 82 includes the 4th resistance R4 connecting with wake-up circuit 81 and connect respectively with the 4th resistance R4
The 5th resistance R5 and first capacitor C1；
Charger control circuit 83 includes the 6th resistance R6 connecting with wake-up circuit 81, connect respectively with the 6th resistance R6
The 7th resistance R7 and the 8th resistance R8, Ji Yu eight resistance R8 connection the 9th resistance R9.
Specifically, WKUP pin in analog front-end module 50 respectively with the one end first resistor R1, the first triode Q1
Collector c, the collector c of the second triode Q2 and the connection of the one end second resistance R2, first resistor R1 other end ground connection, first
The emitter e of triode Q1 is grounded, the base stage b of the first triode Q1 respectively with load control circuit 82, charger control circuit
The cathode of 83 and first diode D1 connects, the emitter e of the second triode Q2 respectively with charger control circuit 83 and second
The anode connection of diode D2, one end base stage b and 3rd resistor R3 of the second triode Q2 connect, the second resistance R2 other end and
The positive B+ connection of battery pack 20, the plus earth of first diode D1, the cathode ground connection of the second diode D2,3rd resistor R3
Other end ground connection；
4th one end resistance R4 is connect with the base stage b of the first triode Q1 in wake-up circuit 81, the 4th resistance R4 other end
Connect respectively with the 5th resistance R5 and the one end first capacitor C1, the 5th resistance R5 other end ground connection, the first capacitor C1 other end with
The negative output terminal P- connection of load end 40；
6th one end resistance R6 is connect with the base stage b of the first triode Q1 in wake-up circuit 81, the 6th resistance R6 other end
It is connect respectively with the 7th resistance R7 and the 8th one end resistance R8, the 7th resistance R7 other end ground connection, the 8th resistance R8 other end point
It is not connect with the negative input end C- of the 9th one end resistance R9 and charger end 30, in the 9th resistance R9 other end and wake-up circuit 81
The emitter e of second triode Q2 connects.
Wherein, the WKUP pin in the analog front-end module 50 is used to receive the wake-up signal of wake-up module 80, wherein should
Wake-up signal is that failing edge is effective, and the low level time is greater than 20ms, for eliminating Hz noise.Wherein protected in the lithium battery
When the not connected load of backplate and charger, lithium battery protection board is in sleep state, i.e. battery pack 20 closes power supply, charge and discharge
Electric module 70 is in close state, 20 Non voltage output of battery pack, therefore the negative output terminal P- of load end 40 and charger
Negative input end C- is not driven by voltage.
When load end 40 is connected with load, i.e., resistance is connected between the positive output end P+ and negative output terminal P- of load end 40
When, the negative output terminal P- voltage of its load end 40 is changed into high level at this time, therefore its load control circuit 82 exports high level
To wake-up circuit 81, the level of the base stage b of the first triode Q1 is high level, so that its first triode Q1 is connected, therefore
So that the WKUP pin level in its analog front-end module 50 switchs to low level, the low pulse of failing edge is generated, so that control simulation
Front-end module 50 works, and is discharged with controlling battery pack 20 to load end 40.
When charger end 30 is connected with voltage, i.e., when charger end 30 is connect with charger, charger end 30 at this time
Negative input end C- is negative voltage, and charger control circuit 83 exports negative electricity and is depressed into wake-up circuit 81, so that its second triode
The voltage of the emitter e of Q2 is negative, so that its second triode Q2 is connected, so that the WKUP in its analog front-end module 50
Pin level switchs to low level, generates the low pulse of failing edge, so that control analog front-end module 50 works, to control by charger
30 pairs of battery packs 20 are held to charge.
Further, as shown in figure 5, in one embodiment of the utility model, charge-discharge modules 70 include charging circuit
71, discharge circuit 72 and charger protection circuit 73；
Charging circuit 71 is connect with battery pack 20, analog front-end module 50 and charger protection circuit 73 respectively, charging electricity
Road 71 is used for the control signal issued according to analog front-end module 50, and control charges to battery pack 20 by charger end 30；
Discharge circuit 72 is connect with battery pack 20, analog front-end module 50 and load end 40 respectively, and discharge circuit 72 is used for
According to the control signal that analog front-end module 50 issues, control battery pack 20 discharges to load end 40；
Charger protection circuit 73 is connect with charging circuit 71 and charger end 30 respectively, and charger protection circuit 73 is used for
Short-circuit protection is carried out to charger.
Specifically, discharge circuit 72 includes the tenth resistance sequentially connecting with the DFET pin of analog front-end module 50 respectively
R10, electric discharge metal-oxide-semiconductor Q3 and the first sampling resistor R21；
Charging circuit 71 includes the third diode D3 sequentially connecting with the CFET pin of analog front-end module 50 respectively, the
11 resistance R11, the first charging metal-oxide-semiconductor Q4, the second charging metal-oxide-semiconductor Q5 and the second sampling resistor R22；
Charger protection circuit 73 includes twelfth resistor R12 and the 4th diode D4.
Wherein, the grid g of electric discharge metal-oxide-semiconductor Q3 is connect with the tenth resistance R10, the drain electrode d and load end 40 of the metal-oxide-semiconductor Q3 that discharges
Negative output terminal P- connection, electric discharge metal-oxide-semiconductor Q3 source electrode s connect with first one end sampling resistor R21, the first sampling resistor R21
The other end is connect with the cathode B- of battery pack 20；
The anode of the CFET pin of analog front-end module 50 and third diode D3 connects, the cathode of third diode D3 and
The connection of the one end eleventh resistor R11, the eleventh resistor R11 other end are connect with the grid g of the first charging metal-oxide-semiconductor Q4, and first fills
The drain electrode d of electric metal-oxide-semiconductor Q4 is connect with the drain electrode d of the second charging metal-oxide-semiconductor Q5, the grid g and electric discharge MOS of the second charging metal-oxide-semiconductor Q5
The source electrode s of the grid g connection of pipe Q3, the second charging metal-oxide-semiconductor Q5 is connect with second one end sampling resistor R22, the second sampling resistor
The R22 other end is connect with the cathode B- of battery pack 20；
The both ends of twelfth resistor R12 and the 4th diode D4 are connected in parallel to the grid g and source electrode s of the first charging metal-oxide-semiconductor Q4
Both ends, the 4th diode D4 anode respectively with first charging metal-oxide-semiconductor Q4 source electrode s and charger end 30 negative input end C-
Connection, the cathode of the 4th diode D4 are connect with the grid g of the first charging metal-oxide-semiconductor Q4.
Specifically, electric discharge metal-oxide-semiconductor Q3 is NMOS chip, using RF1404 in the present embodiment.Charging metal-oxide-semiconductor is NMOS core
Piece is adopted as IRF7469.The resistance value of first sampling resistor R21 is 4 milliohms, and the resistance value of the second sampling resistor R22 is 20 milliohms.
Wherein the DFET pin and CFET pin of analog front-end module 50 are respectively used to realize charge and discharge FET driving function, are filled with driving
Discharge module 70 works.Wherein, when load is connected to the load end 40 of lithium battery protection board, wake-up module 80 sends control
To analog front-end module 50, analog front-end module 50 sends driving signal and exports control electric discharge metal-oxide-semiconductor by DFET pin signal
Q3 conducting, so that battery pack 20 drives loaded work piece.When charger is connected to charger end 30, wake-up module 80 sends control
For signal processed to analog front-end module 50, analog front-end module 50 sends driving signal by CFET pin output the first charging of control
Metal-oxide-semiconductor Q4, the second charging metal-oxide-semiconductor Q5 conducting, while metal-oxide-semiconductor Q3 closing of discharging, so that being filled by charger to battery pack 20
Electricity, and battery pack 20 no longer drives loaded work piece.
Further, in one embodiment of the utility model, which uses the PIC16F688 of PIC company,
Single-chip microcontroller 60 can timing acquiring obtain acquired 20 voltage of battery pack of analog front-end module 50 that connects by I2C bus, according to
Voltage value sends a control signal to analog front-end module 50, so that analog front-end module 50 makes corresponding control to under-voltage and over-voltage
System, judges 20 charged state of battery pack, and control analog front-end module 50 carries out current balance control to battery pack 20
System.The single-chip microcontroller 60 carries out serial communication by UART, while being downloaded by ICSP interface protocol, by the way that single-chip microcontroller is arranged
The value of 60 registers can control overcurrent protection and the current value of short-circuit protection etc..
Further, as shown in fig. 6, in one embodiment of the utility model, which includes the
13 resistance R13, the first metal-oxide-semiconductor Q6, the 14th resistance R14, controllable source of stable pressure U1, the 15th resistance R15 and the second capacitor
C2；
Specifically, the VCC pin of analog front-end module 50 respectively with the one end thirteenth resistor R13 and the first metal-oxide-semiconductor Q6
Source electrode s connection, the thirteenth resistor R13 other end are connect with the grid g of the first metal-oxide-semiconductor Q6, the drain electrode d of the first metal-oxide-semiconductor Q6 and
The connection of 14 one end resistance R14, the 14th resistance R14 other end respectively with the 15th one end resistance R15 and controllable source of stable pressure U1
Cathode K connect with reference to pole R, the anode A ground connection of controllable source of stable pressure U1, the 15th resistance R15 other end is electric with second respectively
Hold the one end C2 to connect with the VREF pin of single-chip microcontroller 60 with ICSP CLK pin, second capacitor C2 other end ground connection.
Wherein, the VCC pin of analog front-end module 50 is used to pass through 3.3V supply voltage, the first MOS for single-chip microcontroller 60
Pipe Q6 is PMOS tube, and controllable source of stable pressure U1 can provide 2.5V reference voltage, and wherein the VREF pin of single-chip microcontroller 60 and ICSP are compiled
The ICSP CLK pin of journey shares.Its second capacitor C2 is used to eliminate the noise on reference voltage channel, wherein the first metal-oxide-semiconductor Q6
Grid g connection be used for 60 working condition of control single chip computer external VREF_CTRL pin, VREF_CTRL pin be used for mention
For switching signal, when low level, is effective.When VREF_CTRL pin is low level, the first metal-oxide-semiconductor Q6 conducting, so that its
Controllable source of stable pressure U1 provides 2.5V voltage input into the VREF pin of single-chip microcontroller 60, so that single-chip microcontroller 60 is in work shape
State, wherein making single-chip microcontroller 60 alternately carry out working condition and sleep by the switching signal that VREF_CTRL pin provides
The variation of state, so that the power consumption of single-chip microcontroller 60 can be reduced.
In use, battery pack 20 closes power supply without electricity when lithium battery protection board is not connect with load and charger
Pressure output.When lithium battery protection board, which connects, to be loaded, wake-up circuit 81 is connect with the WKUP pin in analog front-end module 50
Level low level is switched to by high level, the low pulse of failing edge is generated, so that control analog front-end module 50 works, to control mould
Quasi- front-end module 50 sends driving signal and exports control electric discharge metal-oxide-semiconductor Q3 conducting by DFET pin, so that the driving of battery pack 20 is negative
Carry work.When lithium battery protection board connects charger, the WKUP pin in wake-up circuit 81 and analog front-end module 50 connects
The level connect switchs to low level by high level, generates the low pulse of failing edge, so that control analog front-end module 50 works, with control
Analog front-end module 50 sends driving signal and is led by CFET pin output the first charging of control metal-oxide-semiconductor Q4, the second charging metal-oxide-semiconductor Q5
It is logical, while metal-oxide-semiconductor Q3 closing of discharging, so that charged by charger to battery pack 20, and battery pack 20 no longer drives load
Work.
Lithium battery protection board provided by the embodiment of the utility model, by the charge-discharge modules of setting can to battery pack into
The control of row charge or discharge allows to reduce the power consumption of single-chip microcontroller by the power consumption control module of setting, to save energy
Consumption makes to realize battery overcurrent protection, short-circuit protection and balanced control by the single-chip microcontroller and analog front-end module of setting
System etc., when may make its lithium battery protection board and any charger or load to connect by the way that wake-up module is arranged, lithium battery
Protection board wakes up control battery pack and restores to working condition, to realize to load discharge or be charged by charger；And lithium is electric
When pond protection board is not connected with charger or load, then battery power circuit is closed, stops voltage output, so that increasing lithium
The security performance of battery protecting plate solves the problems, such as that existing lithium battery protection board safety is inadequate.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (8)
1. a kind of lithium battery protection board, charger end including battery pack, for connecting charger and for connecting load
Load end, which is characterized in that further include analog front-end module, single-chip microcontroller, charge-discharge modules and wake-up module；
The analog front-end module is connect with the battery pack；
The single-chip microcontroller is connect by bus with the analog front-end module, and the single-chip microcontroller is used for the simulation according to acquisition
The front-end module battery voltage collected controls the analog front-end module and carries out current balance control to the battery pack
System；
The charge-discharge modules respectively with the battery pack, the analog front-end module, the charger end and the load end
Connection, the charge-discharge modules are used for the control signal issued according to the analog front-end module, control by the charger end
Charging is carried out to the battery pack and/or the battery pack discharges to the load end；
The wake-up module connects with the battery pack, the analog front-end module, the charger end and the load end respectively
It connects, the wake-up module is used to connect when the charger end with the charger and/or the load end connects with the load
When connecing, wake-up signal is sent to the analog front-end module, so that the analog front-end module sends the control signal to institute
Charge-discharge modules are stated, charging and/or the battery pack are carried out to described negative to the battery pack by the charger end with control
End is carried to discharge.
2. lithium battery protection board as described in claim 1, which is characterized in that the wake-up module include respectively with the simulation
It the wake-up circuit and the load control circuit that is connect respectively with the wake-up circuit of front-end module and battery pack connection and fills
Electrical apparatus control circuit；
The load control circuit is connect with the load end, and the load control circuit is used to bear when the load end with described
When carrying connection, the wake-up circuit work is controlled, so that the wake-up circuit sends the wake-up signal to the AFE(analog front end)
Module is discharged with controlling the battery pack to the load end；
The charger control circuit is connect with the charger end, and the charger control circuit is used to work as the charger end
When connecting with the charger, the wake-up circuit work is controlled, so that the wake-up circuit sends the wake-up signal to institute
Analog front-end module is stated, is charged by the charger end to the battery pack with control.
3. lithium battery protection board as claimed in claim 2, which is characterized in that the wake-up circuit include respectively with the simulation
The first resistor of front-end module connection, the second triode, second resistance, is connect with first triode the first triode
First diode and the 3rd resistor being connect respectively with second triode and the second diode；
The analog front-end module respectively with described first resistor one end, the collector of first triode, the described 2nd 3
The collector of pole pipe and the connection of described second resistance one end, the first resistor other end ground connection, the hair of first triode
Emitter grounding, the base stage of first triode respectively with the load control circuit, the charger control circuit and described
The cathode of first diode connects, the emitter of second triode respectively with the charger control circuit and described second
The anode connection of diode, the base stage of second triode are connect with described 3rd resistor one end, and the second resistance is another
It holds and is connect with the anode of the battery pack, the plus earth of the first diode, the cathode ground connection of second diode, institute
State 3rd resistor other end ground connection.
4. lithium battery protection board as claimed in claim 3, which is characterized in that the load control circuit includes and the wake-up
4th resistance of circuit connection and the 5th resistance and first capacitor being connect respectively with the 4th resistance；
The charger control circuit includes the 6th resistance connecting with the wake-up circuit, connect respectively with the 6th resistance
The 7th resistance and the 8th resistance and the 9th resistance being connect with the 8th resistance；
Described 4th resistance one end is connect with the base stage of the first triode described in the wake-up circuit, and the 4th resistance is another
End is connect with the 5th resistance and described first capacitor one end respectively, the 5th resistance other end ground connection, first electricity
Hold the other end to connect with the negative output terminal of the load end；
Described 6th resistance one end is connect with the base stage of the first triode described in the wake-up circuit, and the 6th resistance is another
End is connect with the 7th resistance and described 8th resistance one end respectively, the 7th resistance other end ground connection, the 8th electricity
The resistance other end is connect with the negative input end of described 9th resistance one end and the charger end respectively, the 9th resistance other end
It is connect with the emitter of the second triode described in the wake-up circuit.
5. the lithium battery protection board as described in claim 1-4 is any, which is characterized in that the charge-discharge modules include charging electricity
Road, discharge circuit and charger protection circuit；
The charging circuit is connect with the battery pack, the analog front-end module and the charger protection circuit respectively, institute
The control signal of the charging circuit for issuing according to the analog front-end module is stated, control is by the charger end to described
Battery pack charges；
The discharge circuit is connect with the battery pack, the analog front-end module and the load end respectively, the electric discharge electricity
Road is used for the control signal issued according to the analog front-end module, controls the battery pack and puts to the load end
Electricity；
The charger protection circuit is connect with the charging circuit and the charger end respectively, the charger protection circuit
For carrying out short-circuit protection to the charger.
6. lithium battery protection board as claimed in claim 5, which is characterized in that the discharge circuit include respectively with the simulation
The tenth resistance, electric discharge metal-oxide-semiconductor and the first sampling resistor that front-end module one end sequentially connects；
The charging circuit includes the third diode sequentially connecting with the analog front-end module other end respectively, the 11st electricity
Resistance, the first charging metal-oxide-semiconductor, the second charging metal-oxide-semiconductor and the second sampling resistor；
The charger protection circuit includes twelfth resistor and the 4th diode；
The grid of the electric discharge metal-oxide-semiconductor is connect with the tenth resistance, the drain electrode of the electric discharge metal-oxide-semiconductor and bearing for the load end
The source electrode of output end connection, the electric discharge metal-oxide-semiconductor is connect with first sampling resistor one end, and first sampling resistor is another
End is connect with the cathode of the battery pack；
The analog front-end module other end is connect with the anode of the third diode, the cathode of the third diode and institute
The connection of eleventh resistor one end is stated, the grid that the eleventh resistor other end charges metal-oxide-semiconductor with described first is connect, and described the
One charging metal-oxide-semiconductor drain electrode with it is described second charging metal-oxide-semiconductor drain electrode connect, it is described second charge metal-oxide-semiconductor grid with it is described
It discharging the grid connection of metal-oxide-semiconductor, the source electrode of the second charging metal-oxide-semiconductor is connect with second sampling resistor one end, and described the
The two sampling resistor other ends are connect with the cathode of the battery pack；
The both ends of the twelfth resistor and the 4th diode are connected in parallel to the grid and source electrode of the first charging metal-oxide-semiconductor
Both ends, the anode of the 4th diode is connect with the negative input end of the source electrode of the first charging metal-oxide-semiconductor and charging end, described
The cathode of 4th diode is connect with the grid of the first charging metal-oxide-semiconductor.
7. lithium battery protection board as described in claim 1, which is characterized in that the lithium battery protection board further includes power consumption control
Module, the power consumption control module are connect with the analog front-end module and the single-chip microcontroller, for reducing the single-chip microcontroller
Power consumption.
8. lithium battery protection board as claimed in claim 7, which is characterized in that the power consumption control module includes the 13rd electricity
Resistance, the first metal-oxide-semiconductor, the 14th resistance, controllable source of stable pressure, the 15th resistance and the second capacitor；
Described analog front-end module one end is connect with the source electrode of described thirteenth resistor one end and first metal-oxide-semiconductor respectively, institute
It states the thirteenth resistor other end to connect with the grid of first metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and the 14th electricity
Hinder one end connection, the 14th resistance other end yin with described 15th resistance one end and the controllable source of stable pressure respectively
Pole is connected with reference to pole, the plus earth of the controllable source of stable pressure, and the 15th resistance other end is electric with described second respectively
Hold one end to connect with the single-chip microcontroller, the second capacitor other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822005430.9U CN209344816U (en) | 2018-11-30 | 2018-11-30 | Lithium battery protection board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822005430.9U CN209344816U (en) | 2018-11-30 | 2018-11-30 | Lithium battery protection board |
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| Publication Number | Publication Date |
|---|---|
| CN209344816U true CN209344816U (en) | 2019-09-03 |
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ID=67750191
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822005430.9U Active CN209344816U (en) | 2018-11-30 | 2018-11-30 | Lithium battery protection board |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638904A (en) * | 2018-11-30 | 2019-04-16 | 宁波革鑫新能源科技有限公司 | Lithium battery protection board |
| CN110764446A (en) * | 2019-10-23 | 2020-02-07 | 重庆梅安森科技股份有限公司 | Chip peripheral circuit of integrated on-off control circuit |
-
2018
- 2018-11-30 CN CN201822005430.9U patent/CN209344816U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638904A (en) * | 2018-11-30 | 2019-04-16 | 宁波革鑫新能源科技有限公司 | Lithium battery protection board |
| CN110764446A (en) * | 2019-10-23 | 2020-02-07 | 重庆梅安森科技股份有限公司 | Chip peripheral circuit of integrated on-off control circuit |
| CN110764446B (en) * | 2019-10-23 | 2022-10-04 | 重庆梅安森科技股份有限公司 | Chip peripheral circuit of integrated on-off control circuit |
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