CN109638904A - Lithium battery protection board - Google Patents
Lithium battery protection board Download PDFInfo
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- CN109638904A CN109638904A CN201811452062.0A CN201811452062A CN109638904A CN 109638904 A CN109638904 A CN 109638904A CN 201811452062 A CN201811452062 A CN 201811452062A CN 109638904 A CN109638904 A CN 109638904A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 66
- 239000004065 semiconductor Substances 0.000 claims description 49
- 230000005611 electricity Effects 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000004088 simulation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- H02J7/0026—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention 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 invention solves the problems, such as that existing safety is inadequate.
Description
Technical field
The invention belongs to technical field of lithium batteries more particularly to a kind of lithium battery protection boards.
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.
Summary of the invention
The embodiment of the present invention provides a kind of lithium battery protection board, it is intended to it is inadequate to solve existing lithium battery protection board safety
Problem.
The embodiment of the present invention proposes a kind of lithium battery protection board, charger end including battery pack, for connecting charger,
And the load end for connecting load, it 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 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.
Lithium battery protection board provided by the present invention, due to setting charge-discharge modules to carry out battery pack charging or
The control of electric discharge, 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 battery protection board then closes battery power circuit, stops voltage output, so that increasing when not connecting with charger or load
The security performance for having added lithium battery protection board solves 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 one embodiment of the invention provides；
Fig. 2 is the module map for the lithium battery protection board that a preferred embodiment of the present invention provides；
Fig. 3 is the structure chart of analog front-end module in the lithium battery protection board of a preferred embodiment of the present invention offer；
Fig. 4 is the circuit diagram that connect with wake-up module in lithium battery protection board that a preferred embodiment of the present invention provides；
Fig. 5 is the circuit that connect with charge-discharge modules in lithium battery protection board that a preferred embodiment of the present invention provides
Figure；
Fig. 6 is the circuit that connect with power consumption control module in lithium battery protection board that a preferred embodiment of the present invention provides
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Lithium battery protection board provided by the invention includes battery pack, the charger end for connecting charger, for connecting
Load end, analog front-end module, single-chip microcontroller, charge-discharge modules and the wake-up module of load.Analog front-end module and battery pack
Connection；Single-chip microcontroller is connect by I2C bus with analog front-end module；Charge-discharge modules respectively with battery pack, analog front-end module,
Charger end and load end connection；Wake-up module connects with battery pack, analog front-end module, charger end and load end respectively
It connects, for when charger end is connect with charger and/or load end is connected with load, sending wake-up signal to AFE(analog front end) mould
Block carries out charging and/or battery pack to battery pack by charger end with control so that analog front-end module controls charge-discharge modules
It discharges load end, lithium battery protection board can completely close power circuit when not connecting with charger or load, not have
Voltage output, and when connecting any charger or load, it can be connected and restore battery pack work, improve lithium battery protection board
Safety.
Embodiment one
It is as shown in Figure 1 the module map of lithium battery protection board provided in an embodiment of the present invention.
Lithium battery protection board provided by the invention, charger end 30 including battery pack 20, for connecting charger are used for
Connect 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 embodiment of the present invention passes through can fill battery pack by the charge-discharge modules of setting
The control that electricity perhaps discharges 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 control battery pack is restored to working condition, to realize to load discharge or be charged by charger；
And lithium battery protection board not with charger or load connect when, close battery power circuit, stop voltage output so that increase
The security performance of lithium battery protection board.
Embodiment two
The module map of the lithium battery protection board of preferred embodiment of the present invention offer is provided.Its realization principle and production
Raw technical effect and embodiment one is identical, and to briefly describe, the embodiment of the present invention does not refer to place, can refer in embodiment one
Corresponding contents.
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 invention, the positive B+ of the battery pack 20 is just defeated with charger end 30 respectively
Enter to hold C+ to connect with the positive output end P+ of load end 40, positive B+, the cathode B- of battery pack 20 respectively with analog front-end module
50 positive input terminal, negative input end connection.
In one embodiment of the invention, as shown in figure 3, the intersil company that the analog front-end module 50 uses
ISL9208 chip comprising 32 pins, analog front-end module 50 can provide overcurrent protection, short-circuit protection, 3.3V pressure stabilizing,
Battery balanced control, cell voltage conversion, temperature detection and charge and discharge FET driving function, analog front-end module 50 include
Balancing control circuit, voltage acquisition detection circuit, voltage regulator circuit and charge and discharge electric drive circuit etc.；Wherein balancing control circuit
It 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
Piece machine 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, is used
In 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
Module 70 works.
In one embodiment of the invention, which includes wake-up circuit 81, load control circuit 82 and fills
Electrical apparatus control circuit 83, wherein load control circuit 82 is connect with load end 40, and load control circuit 82 is used to work as load end 40
When connecting with load, control wake-up circuit 81 works, so that wake-up circuit 81 sends wake-up signal to analog front-end module 50, with
Control battery pack 20 discharges 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 present of invention, wake-up circuit 81 include respectively with AFE(analog front end)
Module 50 connect first resistor R1, the first triode Q1, the second triode Q2, second resistance R2, respectively with the first triode
The first diode D1 of 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 present of invention, charge-discharge modules 70 include charging circuit 71, put
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 present of invention, PIC16F688 of the single-chip microcontroller 60 using PIC company, monolithic
Machine 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, it is right
20 charged state of battery pack is judged, and control analog front-end module 50 carries out current balance control to battery pack 20.It should
Single-chip microcontroller 60 carries out serial communication by UART, while being downloaded by ICSP interface protocol, is posted by the way that single-chip microcontroller 60 is arranged
The value of storage can control overcurrent protection and the current value of short-circuit protection etc..
Further, as shown in fig. 6, in one embodiment of the invention, which includes the 13rd
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 in an embodiment of the present invention can fill battery pack by the charge-discharge modules of setting
The control of electricity or electric discharge, allows to reduce the power consumption of single-chip microcontroller by the power consumption control module of setting, with energy saving, leads to
The single-chip microcontroller and analog front-end module for crossing setting to realize overcurrent protection, short-circuit protection and Balance route etc. to battery,
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
It wakes up control battery pack to restore to working condition, to realize to load discharge or be charged by charger；And li-ion cell protection
When plate is not connected with charger or load, then battery power circuit is closed, stop voltage output, so that increasing lithium battery guarantor
The security performance of backplate solves the problems, such as that existing lithium battery protection board safety is inadequate.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
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 are connect with the negative input end of the source electrode of the first charging metal-oxide-semiconductor and the charging end,
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.
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| CN201811452062.0A CN109638904A (en) | 2018-11-30 | 2018-11-30 | Lithium battery protection board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811452062.0A CN109638904A (en) | 2018-11-30 | 2018-11-30 | Lithium battery protection board |
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| CN201811452062.0A Pending CN109638904A (en) | 2018-11-30 | 2018-11-30 | Lithium battery protection board |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111146493A (en) * | 2019-12-26 | 2020-05-12 | 中国船舶重工集团有限公司第七一0研究所 | Lithium battery autonomous activation circuit based on long-term service underwater small platform |
| CN113300432A (en) * | 2021-06-07 | 2021-08-24 | 苏州众鑫凯能源科技有限公司 | Method for detecting charging signal of cathode of battery protection board |
| US11936236B2 (en) | 2021-03-18 | 2024-03-19 | International Business Machines Corporation | Selective discharging of rechargeable battery pack across system load |
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Effective date of registration: 20220209 Address after: No. 588, Chengbei Avenue, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province 213300 Applicant after: LIYANG ZICHEN NEW MATERIAL TECHNOLOGY Co.,Ltd. Address before: Room 491, building 2, Chuangye building, 66 Yuanshi Road, hi tech Zone, Ningbo, Zhejiang Province, 315000 Applicant before: NINGBO GEXIN NEW ENERGY TECHNOLOGY Co.,Ltd. |