CN209658958U - Series-connected cell group controls protective module - Google Patents
Series-connected cell group controls protective module Download PDFInfo
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- CN209658958U CN209658958U CN201920621703.4U CN201920621703U CN209658958U CN 209658958 U CN209658958 U CN 209658958U CN 201920621703 U CN201920621703 U CN 201920621703U CN 209658958 U CN209658958 U CN 209658958U
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Abstract
A kind of series-connected cell group control protective module includes: battery pack, power circuit, power circuit includes: the device power supply circuit for connecting and providing device driving power with battery pack, main control unit, voltage detecting circuit, overcharge protection circuit, over-discharge protection circuit, load circuit, overcharge protection circuit includes: the switching tube Q4 for connecting external power supply or charger and accessing main control unit and working condition conducting, connection external power supply or charger connecting pin and the switching tube Q5 for accessing battery pack and working condition conducting and overcharging state shutdown, the switching tube Q7 that working condition is connected and overcharging state turns off is controlled with switching tube Q5 connection and by main control unit；Above-mentioned series-connected cell group controls protective module, and when voltage, which reaches, overcharges protection value, main control unit detects high level signal; on-off switching tube Q7 is controlled, 1 foot of switching tube Q5 is identical as 2 foot voltage potentials, switching tube Q5 shutdown; the positive and negative circuit shutdown of battery charger, reaches and overcharges protection.
Description
Technical field
The utility model relates to a kind of DC power supply, in particular to a kind of series-connected cell group controls protective module.
Background technique
To in direct current supply module battery or battery pack charge when be easy to cause and overcharge, may cause inner pressure of battery
Situations such as raising, cell deformation, leakage, occurs, and the performance of battery also can be significantly reduced and be damaged.
When lithium ion battery overcharges, cell voltage increases with polarization and is risen rapidly, and can cause positive active material structure
Irreversible change and electrolyte decomposition, generate bulk gas, release a large amount of heat, increase battery temperature and internal pressure sharply
Add, there are the hidden danger such as explosion, burning.Lithium-ion-power cell charging and discharging currents are big, not easy heat radiation, and safety is more easily caused when overcharging
Property problem.
To prevent from overcharging, dedicated charging circuit, or installation safety valve are generallyd use, is greatly overcharged with providing
Protection；It can also be used positive temperature coefficient resistor (PTC), PTC resistor increases battery when can make over-charging of battery and heat up
Internal resistance, limitation overcharge electric current.Dedicated diaphragm can also be used, battery, which is abnormal, makes diaphragm when the temperature is excessively high, diaphragm hole
Occlusion is shunk, the migration of lithium ion is prevented, prevents from overcharging.The above method has certain effect, but excessively complicated or cumbersome, increases
The cost and complexity of battery.If the charging of lithium ion battery generally will limit using dedicated charger, charging voltage
Within 4.2V.But the serious overcharge of battery is caused if not using dedicated charger or charger failure, it would be possible to
Cause battery catches fire, explosion.The charge control of battery is extremely important, and otherwise, there are serious safety problems.
Summary of the invention
Based on this, it is necessary to provide a kind of series-connected cell group control protective module that can effectively carry out overcharging protection.
A kind of series-connected cell group controls protective module, comprising: battery pack that battery cells in series is formed and with the battery
The power circuit of group connection, different battery units or different number battery unit connect to form divided battery group, the battery pack
Cathode connection external power supply or charger connecting pin and ground connection, the power circuit includes: to connect simultaneously with the battery pack
Device power supply circuit, the main control unit for accessing device driving power and the battery unit of device driving power are provided or divided
Group battery pack or battery pack connect and detect battery unit or divided battery group or battery voltage and will test signal and be transferred to
The main control unit is compared the voltage detecting circuit of judgement, connect with the main control unit and battery pack overcharge protection electricity
Road, the over-discharge protection circuit being connect with the main control unit, the load circuit being connect with the over-discharge protection circuit, the voltage
Detection circuit includes: to detect the battery detection unit of battery unit or divided battery group or battery pack and battery unit or grouping
The anode of battery pack or battery pack connects and accesses the electricity that the battery detection unit is controlled detection voltage by battery detection unit
Cell voltage sampling resistor and the sampling filter capacitor connected with corresponding battery voltage sampling resistance and the battery detecting list
Member connects and accesses the switching tube Q10 of the main control unit, the output driving of the switching tube Q10 and the battery detection unit
End connection, the common ground end ground connection of the battery detection unit, the overcharge protection circuit include: connection external power supply or fill
The connecting pin of electric appliance is simultaneously accessed the main control unit and is connect simultaneously in the switching tube Q4 of working condition conducting, with the main control unit
The shutdown of controlled overcharging state and the switching tube Q7 of working condition conducting, it connect with the switching tube Q7 and draws because switching tube Q7 is turned off
The switching tube Q5 of shutdown and working condition conducting is played, battery is accessed by switching tube Q5 in the connecting pin of external power supply or charger
Group.
In a preferred embodiment, 1 foot of the switching tube Q5 is connect with the switching tube Q7, its 2 foot connects external electrical
Source or charger connecting pin, 3 feet pass through the single-way switch pipe D5 access battery pack；The connecting pin of external power supply or charger is logical
Cross switching tube Q5, single-way switch pipe D5 one-way conduction accesses the anode of the battery pack, the switching tube Q5 be metal-oxide-semiconductor Q5, institute
2 feet for stating metal-oxide-semiconductor Q5 are the source electrode of metal-oxide-semiconductor Q5, its connecting pin for accessing external power supply or charger, 1 foot of the metal-oxide-semiconductor Q5
For the grid of metal-oxide-semiconductor Q5,3 feet of the metal-oxide-semiconductor Q5 are the drain electrode of metal-oxide-semiconductor Q5, are connected between the source electrode and grid of the metal-oxide-semiconductor Q5
Biasing resistor R28 is met, the switching tube Q7 is triode Q7, and the metal-oxide-semiconductor Q5 grid accesses the collector of the triode Q7,
The emitter ground connection of the triode Q7, its base stage are accessed the main control unit and are controlled by main control unit, the switching tube Q4
For triode Q4, the positive terminal of the base stage access external power supply of the triode Q4 or charger connecting pin, its emitter ground connection,
Its collector accesses the main control unit.
In a preferred embodiment, described triode Q7, Q4 are NPN type triode, and the unidirectional conducting switch pipe D5 is
Diode D5, the metal-oxide-semiconductor Q5 are P-channel enhancement type metal-oxide-semiconductor, and the drain electrode of the metal-oxide-semiconductor Q5 accesses battery by diode D5
The anode of group, the diode D5 anode accesses the drain electrode of the metal-oxide-semiconductor Q5, its cathode accesses the anode of the battery pack, institute
The base stage for stating triode Q7 accesses the main control unit by resistance R25, and device drive power supply accesses triode by resistance R13
The collector of Q4, the triode Q4 base stage are outer by resistance R26 connection by pull down resistor R27 ground connection, base stage branch branch
Portion's power supply or the positive terminal of charger connecting pin, its emitter ground connection, its collector access main control unit.
In a preferred embodiment, the over-discharge protection circuit includes: access load circuit and connects the main control unit
By main control unit be controlled in working condition conducting and over-discharge state turn off switching tube QM1, described load circuit one end with it is described
Anode connection, the other end and the switching tube QM1 other end of battery pack connect, and the switching tube QM1's further terminates into the electricity
The cathode of pond group, the switching tube QM1 access one end the control terminal of the main control unit.
In a preferred embodiment, the switching tube QM1 is metal-oxide-semiconductor QM1, and the switching tube QM1 is that N-channel is enhanced
Metal-oxide-semiconductor accesses between biasing resistor R36, its source electrode and drain electrode between the grid and source electrode of the metal-oxide-semiconductor QM1 and accesses capacitor
The grid of C18, the metal-oxide-semiconductor QM1 access exporting to control to adjust by pulse-width regulated for the main control unit by resistance R35
The source electrode of the PWM control terminal of voltage or power, the metal-oxide-semiconductor QM1 accesses the cathode of the battery pack by current-limiting resistance RS1,
The battery electrode access external power supply or charger cathode connecting pin are simultaneously grounded.
In a preferred embodiment, further includes: the short-circuit protection circuit that is connect with the main control unit and the battery pack,
To the main control unit connection and measure loop electric current current foldback circuit, it is corresponding with battery pack or battery unit be arranged with inspection
It surveys battery pack or battery cell temperature and feeds back to the high-temperature protection circuit that the main control unit control carries out overheat protector, it is described
Short-circuit protection circuit include: with main control unit connection and compared with input voltage and reference voltage to feed back to main control unit control
The switching tube QM1 on or off is made to carry out the anti-phase input of the comparator U4 of short-circuit protection, the access comparator U4
Simultaneously the sampling resistor R39 of connection switch pipe QM1, the filter capacitor C19 connecting with sampling resistor R39 are held, the comparator U4's
Output end accesses the main control unit, and the sampling resistor R39 other end accesses the battery pack by current-limiting resistance；The high temperature dwell
Protection circuit include: it is corresponding to battery pack or battery unit be arranged with detect battery pack or battery cell temperature and with the master control list
Member connection will test signal and feed back to the thermistor NTC of the main control unit, be connected in parallel on the filter at the both ends the thermistor NTC
Wave capacitor C12, the thermistor NTC other end ground connection.
In a preferred embodiment, the power end of the comparator U4 accesses device driving power, the comparator U4's
Power end extends a branch and is grounded by resistance R40, R41；The normal phase input end of the comparator U4 accesses resistance R40, R41
Between, common ground end ground connection；The source electrode of the sampling resistor R39 access switching tube QM1, simultaneously branch passes through current-limiting resistance
RS1 accesses the cathode of the battery pack, the current foldback circuit include: the sampling resistor R45 for accessing the main control unit, with
The filter capacitor C21 of sampling resistor R45 connection, the test side of the sampling resistor R45 access main control unit, sampling resistor R45
The other end is linked into the source electrode of the switching tube QM1；Device drive electricity is accessed by resistance R18 in the one end the thermistor NTC
Source, the end extend a branch and access the main control unit.
In a preferred embodiment, the power circuit further include: connect with the main control unit and supplied with the device
The start-up circuit of electric circuit connection, the device power supply circuit include: the switching tube Q2 connecting with the battery pack, open with described
The single-way switch pipe D1 for closing pipe Q2 connection, the voltage-stablizer U2 being connect with the single-way switch pipe, it is opened with what the battery pack was connect
Pipe Q1, the output end output device driving power of the voltage-stablizer U2, external power supply or charger connecting pin are closed by unidirectionally opening
It closes pipe D2 and accesses switching tube Q1, the main control unit accesses switching tube Q1, the switching tube Q2 and institute by single-way switch pipe D4
It states single-way switch pipe D1 and connects one end outputting reference voltage, the start-up circuit includes: to receive starting operation and by enabling signal
Be transferred to that main control unit control load carries out classification or stepping work starts switch SW1, described to start switch the termination of SW1 mono-
Ground, the other end access the main control unit, the other end draws a branch and accesses the device power supply circuit.
In a preferred embodiment, the switching tube Q2 is P-channel enhancement type metal-oxide-semiconductor Q2, and the switching tube Q1 is NPN tri-
Pole pipe Q1, described single-way switch pipe D1, D4, D2 are diode D2；The anode connection terminal of external power supply or charger passes through resistance
R14, diode D2 one-way conduction, the base stage for being linked into through resistance R11 triode Q1, the collector of triode Q1 through resistance R8,
The source electrode of R7 access metal-oxide-semiconductor Q2 and the anode for accessing the battery pack；The main control unit output provides device driving power
Relative low voltage or negative voltage, the base stage that triode Q1 is linked into through diode D4 one-way conduction, through resistance R11, the metal-oxide-semiconductor
Between grid access the resistance R7 and R8 of Q2 and branch is linked into through resistance R48 and starts switch SW1, the base stage of the triode Q1
It is provided with resistance R6 between emitter, and is grounded by emitter, the drain electrode outputting reference voltage of the metal-oxide-semiconductor Q2 simultaneously passes through
Diode D1 one-way conduction, the input terminal that voltage-stablizer U2 is linked by resistance R10, the output end follower of the voltage-stablizer U2
Part driving power, voltage-stablizer U2 input terminal branch's branch is grounded through capacitor C8, the ground terminal of voltage-stablizer U2 is grounded, its output
End is grounded through capacitor C9, and the main control unit starts switch one end of SW1 through diode D3 access, starts switch the another of SW1
End ground connection, it is described start switch drawn between the diode D3 branch by resistance R48, through the connecting pin resistance R7 and R8
The grid of metal-oxide-semiconductor Q2 is accessed, the main control unit is linked into charge indication means by current-limiting resistance.
In a preferred embodiment, the power end of the battery detection unit accesses the anode of battery pack by resistance R20,
The anode of battery pack accesses the common ground end of the battery detection unit by resistance R20, capacitor C14 and is grounded；Switching tube
Q10 is the enhanced metal-oxide-semiconductor of N-channel, and the grid of metal-oxide-semiconductor Q10 are accessed at the output driving end of the battery detection unit by resistance R12
Pole, the drain electrode of metal-oxide-semiconductor Q10 access between the main control unit, its source electrode ground connection, its grid and source electrode and are provided with resistance R21, electricity
Cell voltage sampling resistor accesses the battery detecting end of battery detection unit, and the battery voltage sampling resistance includes: and first
Battery unit connects the first battery voltage sampling resistance and is arranged according to different grouping battery pack is corresponding to N divided battery group
The N+1 battery voltage sampling resistance, the sampling filter capacitor include: be arranged corresponding to the first battery voltage sampling resistance
The N+1 sampling filter capacitor that first sampling filter capacitor, Ji Yu N+1 battery voltage sampling resistance are accordingly arranged, institute
State first sampling filter capacitor one end connect with the first battery voltage sampling resistance, its other end ground connection；The N+1 sampling filter
Capacitor one end is connect with the N+1 battery voltage sampling resistance, its other end is connect with n-th battery voltage sampling resistance.
Above-mentioned series-connected cell group controls protective module, is controlled by main control unit, when charging normal work, with external electrical
The switching tube Q5 conducting of source or charger connection, switching tube Q7, Q4 conducting carry out charging normal work, after battery is fully charged,
Voltage reaches default when overcharging protection value, and main control unit detects high level signal, judges that battery unit or battery pack are in electricity
Overcharging state is pressed, main control unit output controls signal on-off switching tube Q7, when switching tube Q7 shutdown, 1 foot of switching tube Q5 and 2
Foot voltage potential is identical, switching tube Q5 shutdown, and the positive and negative circuit shutdown of battery charger, charging stops, reaching and overcharge protection, electricity
Road design is simple, and performance is stablized effectively, can be realized by main control unit control switch pipe on-off and overcharges protection.Passed through simultaneously
Discharge protection circuit carries out Cross prevention.
Detailed description of the invention
Fig. 1 is the partial circuit original that the series-connected cell group of an embodiment of the present invention controls the power circuit of protective module
Reason figure.
Specific embodiment
As shown in Figure 1, the series-connected cell group of an embodiment of the present invention controls protective module, comprising: battery unit string
Join the battery pack formed and the power circuit connecting with battery pack.Battery pack from the B+/B- of power circuit terminate into.
In the present embodiment, different battery units or different number battery unit connect to form divided battery group.Such as two electricity
Pool unit or two batteries connect to form first divided battery group；Successively three battery units or three batteries connect to form
Two divided battery groups, and so on.
The cathode B- access external power supply of the battery pack of the present embodiment or the cathode connecting pin CH- of charger, and be grounded.
The power circuit of the present embodiment include: the device power supply circuit for connecting and providing device driving power with battery pack,
It is linked into the main control unit U1 of device drive power supply, is connect with battery unit or divided battery group or battery pack and detects battery list
Member or divided battery group or battery voltage and it will test signal and be transferred to the voltage detecting electricity that main control unit is compared judgement
Road, the overcharge protection circuit being connect with main control unit U1, the over-discharge protection circuit being connect with main control unit U1 and Cross prevention electricity
The load circuit of road connection.
The voltage detecting circuit of the present embodiment includes: the battery detecting for detecting battery unit or divided battery group or battery pack
Unit U3, it is connect with the anode of battery unit or divided battery group or battery pack and accesses battery detection unit U3 by battery detecting
The battery voltage sampling resistance of unit U3 control detection voltage and the sampling filter connected with corresponding battery voltage sampling resistance
Capacitor, the switching tube Q10 for being connect with battery detection unit U3 and accessing main control unit U1.Switching tube Q10 and battery detection unit
The output driving end OV connection of U3.The common ground end VSS of battery detection unit is grounded.
The overcharge protection circuit of the present embodiment includes: to connect the connecting pin of external power supply or charger and access main control unit
U1 and in the switching tube Q4 of working condition conducting, with main control unit U1 connection and controlled overcharging state turns off and working condition is connected
Switching tube Q7, with switching tube Q7 connection and because of switching tube Q7 shutdown cause shutdown and the switching tube Q5 that is connected of working condition.Outside
Battery pack is accessed by switching tube Q5 in the connecting pin of portion's power supply or charger.
Further, in the present embodiment, CH+/CH- is the connecting pin of external power supply or external charger.The cathode of battery pack
B- accesses external power supply or charger cathode connecting pin CH-, and is grounded.
Further, in the present embodiment device drive power supply provided by device power supply circuit be the present embodiment chip or electricity
5V power supply needed for sub- device.Certainly it can also need to provide corresponding driving power or power supply according to specific circuit.
The working condition of the present embodiment refers mainly to normal operating conditions, it is non-overcharge, over-voltage, under-voltage, excess temperature, overcurrent etc. it is non-just
Normality working condition.
The main control unit of the present embodiment is chip U1, it is preferred that the main control unit U1 of the present embodiment uses model
The chip of KF8V204, but it is not limited to the chip, as long as the functional circuit of the present embodiment can be implemented.
The main control unit U1 of the present embodiment is illustrated for KF8V204 model chip, only illustrates clear, is not to limit
It is used.
1 foot of main control unit U1 is power end VDD, accesses device driving power end+5V, and be grounded by capacitor C11；20
Foot is common ground end, ground connection；2 feet are with the two directions' inputing output port P0.5 with pull-up and level change interrupt function；3
Foot can also be able to be ADC input channel for the two directions' inputing output port P0.4 with pull-up and level change interrupt function
AN3；4 feet can be used as program voltage input terminal MODE, also can be used as external reset signal input terminal RST, also can be used as with band
The input port P0.3 of level change interrupt function；5 feet are two directions' inputing output port P1.5；6 feet are two directions' inputing output end
Mouth P1.4；7 feet can be used as external interrupt input pin INT2, also can be used as ADC input channel AN7, also can be used as two directions' inputing
Output port P1.3；8 feet are two directions' inputing output port P1.6；9 feet are two directions' inputing output port P1.7；10 feet can be two-way
Input/output port P2.7 also can be used as ADC input channel AN11；11 feet can be two directions' inputing output port P2.6, can also be
ADC input channel AN10；12 feet can be two directions' inputing output port P2.5, can also be ADC input channel AN9；13 feet can be double
It can also be ADC input channel AN8 to input/output port P2.4；14 feet can be two directions' inputing output port P1.2, can also be
ADC input channel AN6 also can be used as external interrupt input pin INT1；15 feet can be two directions' inputing output port P1.1, can also
For ADC input channel AN5；16 feet can be two directions' inputing output port P1.0, can also be ADC input channel AN4；17 feet can be tool
There is the two directions' inputing output port P0.2 with pull-up and level change interrupt function, can also be ADC input channel AN2, can also make
For the input of T0 clock, external interrupt input pin INT0 also can be used as；18 feet can be for band pull-up and level change interruption function
The two directions' inputing output port P0.1 of energy can also input SPCLK for Mbus, also can be used as ADC input channel AN1, can also
ADVRIN is inputted as AD external reference voltage, also can be used as PWM output PWM2；19 feet can be for band pull-up and level change
The two directions' inputing output port P0.0 of interrupt function can also input SPDAT for programming data, also can be used as ADC input channel
AN0 also can be used as PWM output PWM1.
The battery detection unit U3 of the present embodiment is chip U3, can use BM3051 family chip, be certainly not limited to this
Chip, if can implement the voltage detecting of battery unit in the power circuit of the present embodiment or divided battery group or battery pack,
Or protection.
The battery detection unit U3 of the present embodiment is illustrated for BM3051 family chip, only illustrate it is clear, not for
Restriction is used.
Further, the switching tube Q5 of the present embodiment accesses the positive B+ of battery pack by unidirectional conducting switch pipe D5.Switch
Pipe Q5 is metal-oxide-semiconductor Q5, and 2 feet of metal-oxide-semiconductor Q5 are the source electrode of metal-oxide-semiconductor Q5, its access external power supply or charger connecting pin, metal-oxide-semiconductor
1 foot of Q5 is the grid of metal-oxide-semiconductor Q5, and 3 feet of metal-oxide-semiconductor Q5 are the drain electrode of metal-oxide-semiconductor Q5.Preferably, the switching tube Q5 of the present embodiment
For P-channel metal-oxide-semiconductor Q5.The source electrode connection external power supply or charger connecting pin CH+ of metal-oxide-semiconductor Q5.The source electrode and grid of metal-oxide-semiconductor Q5
Between connect biasing resistor R28.Biasing resistor R28 provides bias voltage for metal-oxide-semiconductor Q5, while playing the role of bleed off resistance,
Protect grid G-source S.Preferably, the metal-oxide-semiconductor Q5 of the present embodiment is P-channel enhancement type metal-oxide-semiconductor.
Further, the switching tube Q7 of the present embodiment is triode Q7.Preferably, triode Q7 is NPN type triode.MOS
The source electrode access external power supply of pipe Q5 or positive terminal CH+, its grid of charger connecting pin pass through resistance R29 access triode Q7
Collector.The emitter ground connection of triode Q7, its base stage access main control unit U1.
Further, the unidirectional conducting switch pipe D5 of the present embodiment is diode D5.Diode D5 anode accesses metal-oxide-semiconductor Q5's
Drain electrode, its cathode access the positive B+ of battery pack by fuse F1.The base stage of triode Q7 accesses master control list by resistance R25
13 feet of first U1, i.e. two directions' inputing output port P2.4.
Further, the switching tube Q4 of the present embodiment is triode Q4, and triode Q4 is preferably NPN triode.Triode Q4
Base stage access external power supply or charger connecting pin positive terminal CH+, its emitter ground connection, its collector access main control unit
U1.Preferably, the input that 18 feet of the collector access main control unit U1 of the triode Q4 of the present embodiment, i.e. level change interrupt
Port.External power supply or charger anode connection terminal CH+ access the base stage of triode Q4 by resistance R26.
Further, the triode Q4 base stage of the present embodiment passes through resistance R26 connection external power supply or charger connecting pin
Positive terminal CH+ is provided with pull down resistor R27 and is grounded by pull down resistor R27 between base stage and emitter.
Device drive power supply+5V accesses 4 feet of main control unit U1 by resistance R13, that is, has level change interrupt function
Input port P0.3, the input port P0.3 with level change interrupt function of main control unit U1 separately passes through capacitor C13 and connects
Ground.The output driving end OV of battery detection unit U3 accesses 4 feet of main control unit U1 by metal-oxide-semiconductor Q10, that is, has level change
The input port P0.3 of interrupt function.
The unidirectional conducting switch pipe D5 of the present embodiment is diode D5.The drain electrode of metal-oxide-semiconductor Q5 passes through diode D5 access electricity
The positive B+ of pond group.Diode D5 anode accesses the positive B+ of the drain electrode of metal-oxide-semiconductor Q5, its cathode access battery pack.
When charging normal work, the metal-oxide-semiconductor Q5 of the present embodiment is connected, triode Q7, Q4 conducting.After battery is fully charged,
Voltage meets or exceeds default when overcharging protection value such as 25.5V or so, and 13 feet of main control unit U1 detect high level signal, sentence
Power-off pool unit or battery pack are in voltage overcharging state, and main control unit U1 output control signal turns off triode Q7, when three poles
When pipe Q7 is turned off, 1 foot of metal-oxide-semiconductor Q5 is identical as 2 foot voltage potentials, i.e. the grid of metal-oxide-semiconductor Q5 is identical as source potential, metal-oxide-semiconductor
Q5 shutdown, the positive and negative circuit shutdown of battery charger, charging stop, reaching and overcharge protection.
Further, the over-discharge protection circuit of the present embodiment includes: access load circuit and connects main control unit U1 by master control
Unit U1 is controlled in the switching tube QM1 of working condition conducting and the shutdown of over-discharge state.The positive B of load circuit one end and battery pack
+ connection, the other end and switching tube QM1 connection.Two terminating load positive and negative anodes of load circuit.Master control list is accessed in the one end switching tube QM1
First U1, the other end access the cathode B- of battery pack.The control terminal of switching tube QM1 access main control unit U1.The control terminal is PWM control
End processed adjusts input voltage by adjusting pulsewidth using PWM (pulse width modulates Pulse Width Modulation) control
Or power.
Further, the switching tube QM1 of the present embodiment is N-channel MOS pipe QM1.The grid and source electrode of metal-oxide-semiconductor QM1 is indirectly
Enter and accesses capacitor C18 between resistance R36, its source electrode and drain electrode.The grid of metal-oxide-semiconductor QM1 accesses main control unit by resistance R35
19 feet, i.e. PWM control terminal PWM1.
The metal-oxide-semiconductor QM1 of the present embodiment comes with parasitic diode, in the case where preventing VDD over-voltage, burns out metal-oxide-semiconductor.Over-voltage
When, high current is directly arrived ground, so that metal-oxide-semiconductor be avoided to be burned by diode elder generation reverse breakdown.The source electrode of metal-oxide-semiconductor is prevented simultaneously
Metal-oxide-semiconductor is burnt out when with drain electrode reversal connection, access can also be provided when circuit has reversed induced potential for reversed induced potential, keep away
Exempt from reversed induced potential breakdown metal-oxide-semiconductor.
Further, the source electrode of the metal-oxide-semiconductor QM1 of the present embodiment accesses the cathode B- of battery pack by current-limiting resistance RS1.Battery
The cathode B- connection external power supply of group or the cathode CH- of charger connecting pin, and be grounded.Preferably, the switching tube of the present embodiment
QM1 is N-channel MOS pipe.
When regular picture state, when such as powering load, metal-oxide-semiconductor QM1 conducting, when detect cell voltage discharge into down to
Or when lower than default over-discharge voltage such as when 16V or so, 1 foot, that is, grid of metal-oxide-semiconductor QM1 exports low potential, main control unit U1 control
Metal-oxide-semiconductor QM1 shutdown, load circuit shutdown, work stop, and reach discharge prevention.
Further, the series-connected cell group of the present embodiment controls protective module further include: connects with main control unit U1 and battery pack
The short-circuit protection circuit connect.The short-circuit protection circuit of the present embodiment include: with main control unit U1 connection and compared with input voltage with
Main control unit U1 control switch pipe QM1 on or off is fed back to carry out the comparator U4 of short-circuit protection, access comparator U4's
The sampling resistor R39 of inverting input terminal and connection switch pipe QM1, the filter capacitor C19 being connect with sampling resistor R39.Sampling electricity
The inverting input terminal of the one end R39 access comparator U4 is hindered, the other end accesses the source electrode of metal-oxide-semiconductor QM1.Filter capacitor C19 mono- is terminated
Enter the inverting input terminal of comparator U4, other end ground connection.
The output end of comparator U4 accesses main control unit U1.The present embodiment, it is preferred that the output end of comparator U4 accesses master
17 feet of unit U1 are controlled, as there is the two directions' inputing output port P0.2 with pull-up and level change interrupt function.Comparator
The electrical parameter that U4 will test such as voltage judges whether over-voltage or overcurrent compared with a reference value, will test and judges that signal is transferred to
Main control unit U1 is controlled.
Device drive power end+the 5V that the power end access device power supply circuit of comparator U4 provides, the electricity of comparator U4
The branch of source is grounded by resistance R40, R41, public between normal phase input end access resistance R40, R41 of comparator U4
Ground terminal ground connection.The comparator U4 of the present embodiment is preferred, can select the amplifier of model LM321, but not limited to this type
Number, compare enlarging function as long as realizing.
When load short circuits, 2 feet, that is, source electrode moment of metal-oxide-semiconductor QM1 generates high current, carries out electricity by sampling resistor R39
Stream sampling, 3 feet, that is, inverting input terminal of comparator U4 detect high potential, and master control list U1 control shutdown metal-oxide-semiconductor QM1, circuit is closed
It is disconnected to reach short-circuit protection.
Further, the series-connected cell group of the present embodiment controls protective module further include: connect and detects with main control unit U1
The current foldback circuit of loop current.The current foldback circuit of the present embodiment includes: the sampling resistor for accessing main control unit U1
R45, the filter capacitor C21 being connect with sampling resistor R45.14 feet of main control unit U1, a termination are accessed in the one end filter capacitor C21
Ground.14 feet that main control unit is accessed in the one end sampling resistor R45 carry out over-current detection, and the sampling resistor R45 other end accesses switching tube
The source electrode of QM1, while passing through the cathode B- of current-limiting resistance RS1 access battery pack.
When loop current is excessive, by sampling resistor R45,14 feet of main control unit U1 detect high potential, master control list
First U1 control shutdown metal-oxide-semiconductor QM1, circuit shutdown reach overcurrent protection.
Further, the series-connected cell group of the present embodiment controls protective module further include: with battery unit or divided battery group
Or battery pack is accordingly arranged and connect with main control unit U1, detects battery pack or battery cell temperature to feed back to main control unit
The high-temperature protection circuit of U1 progress overheat protector.Further, the high-temperature protection circuit of the present embodiment include: with battery unit or point
Group battery pack or battery pack be accordingly arranged with detect battery unit or divided battery group or battery pack temperature and with main control unit U1
Connection will test signal and feed back to the thermistor NTC that main control unit U1 controlled, the filter for being connected in parallel on the both ends thermistor NTC
Wave capacitor C12.Device driving power end+5V is accessed by resistance R18 in the one end thermistor NTC, the end branches out a branch
Access 11 feet of main control unit U1, thermistor NTC other end ground connection.11 feet of main control unit U1 are two directions' inputing output port
P2.6 detects thermistor NTC change in resistance bring potential change.
When battery is in charge or discharge, when battery surface temperature meets or exceeds preset excess temperature temperature range such as
When 55-70 is spent, thermistor NTC rises with the battery unit or divided battery group of detection or the temperature of battery pack and resistance value drops
Low, 11 feet of main control unit U1 detect low potential, main control unit U1 control shutdown metal-oxide-semiconductor QM1, and cell circuit shutdown stops
Charge or discharge, reach a high temperature defencive function.
Further, the device power supply circuit of the present embodiment includes: that the switching tube Q2 connecting with battery pack and switching tube Q2 connects
The single-way switch pipe D1 that connects, it is opened with single-way switch pipe D1 voltage-stablizer U2, one end and the battery pack connecting and switching tube Q2 connection
Close pipe Q1.The output end output device driving power of voltage-stablizer U2.External power supply or charger connecting pin pass through single-way switch pipe
D2 accesses switching tube Q1.Main control unit U1 accesses switching tube Q1 by single-way switch pipe D4.Switching tube Q2 and single-way switch pipe D1
Connect one end outputting reference voltage VCC.
Further, the switching tube Q2 of the present embodiment is metal-oxide-semiconductor Q2；The present embodiment is preferred, and switching tube Q2 is P-channel enhancing
Type metal-oxide-semiconductor Q2.Switching tube Q1 is NPN triode Q1；Single-way switch pipe D1 is diode D1；Single-way switch pipe D4 is diode
D4；Single-way switch pipe D2 is diode D2.The anode connection terminal CH+ of external power supply or charger, by resistance R14, diode
D2 one-way conduction, the base stage that triode Q1 is linked into through resistance R11.Main control unit output is supplied to device power supply circuit to export
The relative low voltage or negative voltage of device drive power supply are linked into triode Q1's through diode D4 one-way conduction, through resistance R11
Base stage.Source electrode of the collector of triode Q1 through resistance R8, R7 access metal-oxide-semiconductor Q2, and access the positive B+ of battery pack；Metal-oxide-semiconductor
The grid of Q2, which connect common end with R8 by resistance R7, to be continued to extend to be linked into through resistance R48 to start switch SW1.The present embodiment
In, another branch is drawn between resistance R7 and R8 through resistance R48 to be linked into charge indication means by 1 foot of connector J2
Power end.
Further, the emitter ground connection of the triode Q1 of the present embodiment, is provided with resistance R6 between base stage and emitter.
The base stage of triode Q1, other end ground connection are accessed in the one end resistance R6.The drain electrode outputting reference voltage VCC of metal-oxide-semiconductor Q2 and through two poles
Pipe D1 one-way conduction, resistance R10 are linked into the input terminal of voltage-stablizer U2, voltage-stablizer U2 output end output device driving power+5V.
Diode D1 anode and the drain electrode connection of metal-oxide-semiconductor Q2, cathode are linked into the input terminal VIN of voltage-stablizer U2 by resistance R10.Pressure stabilizing
The input terminal of device U2 is drawn a branch and is grounded through capacitor C8 ground connection, its ground terminal ground connection, its output end through capacitor C9.
Further, the start-up circuit of the present embodiment includes: to receive starting operation and enabling signal is transferred to main control unit
U1, to pass through detection or judge that different enabling signals control loads be classified or what stepping worked starts switch SW1.Such as master control
Unit U1 detects that start switch SW1 pressing primary, then controls into one grade of working condition, detects pressing two in setting time
It is secondary, it controls into second gear working condition, and so on, detect that pressing is then controlled three times into three gear work in setting time
State etc..Also it is primary to may be set to pressing, main control unit U1 control enters one grade of working condition, continuous pressing then control twice into
Enter second gear working condition, and so on.Certainly other steppings or stepped starting mode also be may be set to.
PWM control mode can be used in main control unit U1, and to adjust different output waves wide to adjust different output voltages, adjusts not
Same output power.In the present embodiment, main control unit U1 starts or closes down mode according to the difference of setting, its 19 foot is driven to pass through
PWM control mode exports different capacity, to carry out stepping or grading control.It can be used in multiple loads, in such as multiple motors, root
Different capacity is exported according to different stalls control motor, such as adjusts dust catcher different capacity and uses.
In the present embodiment, the one end SW1 is started switch through in resistance R45 access device power supply circuit.Further, the present embodiment
The one end dynamic switch SW1 through resistance R45 access resistance R7 and R8 public connecting end and extend access metal-oxide-semiconductor Q2 grid.It opens
Dynamic switch SW1 other end ground connection.3 feet of the main control unit U1 of the present embodiment start switch one end of SW1 through diode D3 access,
The other end ground connection started switch.
The power end of charge indication means accesses the positive B+ of battery pack by fuse F1.6,7, the 8 of main control unit U1
Foot passes through current-limiting resistance respectively and is linked into charge indication means, to indicate respectively that different indicator lights lights instruction, passes through difference
Indicator light or different display or indicating mode instruction charging different situations or state.
Different indicating modes can be set as needed in the charge indication means of the present embodiment, and such as different lamps indicate, charging is held
Amount ratio is shown.In the present embodiment, using being arranged, different indicator lights carry out different charged states or charging capacity ratio carries out
Display or instruction.The different charging capacitys that LED1, LED2, LED3 instruction reach such as are set.LED1 is accessed by current-limiting resistance R15
8 feet of main control unit U1, i.e. two directions' inputing output port P1.6 carry out lighting display by main control unit U1 control.LED2 is logical
Cross current-limiting resistance R16 access main control unit U1 7 feet, i.e. two directions' inputing output port P1.3, by main control unit U1 control into
Row lights display.LED3 accesses 6 feet of main control unit U1 by current-limiting resistance R17, i.e. two directions' inputing output port P1.4 passes through
Main control unit U1 control carries out lighting display.
The load circuit of the present embodiment includes: the capacitor C16 and diode D6 being connected in parallel.The cathode of diode D6 passes through
Fuse F1 accesses battery anode B+, the drain electrode of anode access metal-oxide-semiconductor QM1.Battery anode B+ connects load anode, battery
Group cathode B- connects load cathode.Two terminating load of load circuit can connect multiple loads as needed, be controlled by main control unit U1
It is operated.
Further, the power end of the battery detection unit of the voltage detecting circuit of the present embodiment passes through resistance R20 access electricity
The positive B+ of pond group, the positive B+ of battery pack access the common ground end of battery detection unit U3 by resistance R20, capacitor C14
VSS is simultaneously grounded.
Switching tube Q10 is the enhanced metal-oxide-semiconductor of N-channel.The output driving end OV of battery detection unit U3 is connect by resistance R12
Enter the grid of metal-oxide-semiconductor Q10.Drain electrode access main control unit U1, its source electrode of metal-oxide-semiconductor Q10 is grounded, is arranged between its grid and source electrode
There is resistance R21.Further, 4 feet of the drain electrode access main control unit U1 of metal-oxide-semiconductor Q10, that is, have with level change interrupt function
Input port P0.3.
The battery pack of the present embodiment is illustrated using the battery pack of the battery unit composition of 4 series connections, is only said
It is bright, it is used without limitation.
The battery detecting end of battery voltage sampling resistance access battery detection unit.The battery detection unit U3 of the present embodiment
Battery detecting end include: the first battery detecting end BAT1, the second battery detecting end BAT2, third battery detecting end BAT3,
Four battery detecting end BAT4, the 5th battery detecting end BAT5.
Battery voltage sampling resistance includes: the first battery voltage sampling resistance to be connect with first battery unit and according to not
With divided battery group the N+1 battery voltage sampling resistance being arranged corresponding to N divided battery group.Sampling filter capacitor packet
It includes: the first sampling filter capacitor being arranged corresponding to the first battery voltage sampling resistance, Ji Yu N+1 battery voltage sampling electricity
Hinder the N+1 sampling filter capacitor being accordingly arranged.The N+1 sampling filter capacitor one end and the N+1 battery voltage sampling
Resistance connection, its other end are connect with n-th battery voltage sampling resistance.
The anode of first battery unit is accessed in first battery voltage sampling one end resistance RV1, and the other end accesses battery
The first battery detecting end BAT1 of detection unit U3.First sampling filter one end capacitor CV1 and the first battery voltage sampling resistance
RV1 connection, its other end ground connection.Further, first sampling filter one end capacitor CV1 of the present embodiment is adopted with the first cell voltage
Sample resistance RV1 accesses one end connection of the first battery detecting of battery detection unit U3 end BAT1, other end ground connection.
2 battery units being sequentially connected in series form the first divided battery group.Second battery voltage sampling resistance RV2 mono- termination
Enter the anode of the first divided battery group, the other end accesses the second battery detecting end BAT2 of battery detection unit U3.Second adopts
Sample one end filter capacitor CV2 connect with the second battery voltage sampling resistance RV2, its other end and the first battery voltage sampling resistance
RV1 connection.Further, second sampling filter one end capacitor CV2 of the present embodiment and the second battery voltage sampling resistance RV2 are accessed
One end connection, its other end and the first battery voltage sampling resistance of the second battery detecting end BAT2 of battery detection unit U3
RV1 accesses one end connection of the first battery detecting of battery detection unit U3 end BAT1.
The 3 battery units composition second packet battery pack being sequentially connected in series.Third battery voltage sampling resistance RV3 mono- is terminated
Enter the anode of second packet battery pack, the other end accesses the third battery detecting end BAT3 of battery detection unit U3.Third is adopted
Sample one end filter capacitor CV3 connect with third battery voltage sampling resistance RV3, its other end and the first battery voltage sampling resistance
RV2 connection.Further, third sampling filter one end capacitor CV3 of the present embodiment and third battery voltage sampling resistance RV3 are accessed
One end connection, its other end and the second battery voltage sampling resistance of the third battery detecting end BAT3 of battery detection unit U3
RV2 accesses one end connection of the second battery detecting of battery detection unit U3 end BAT2.
The four battery units composition battery pack being sequentially connected in series.Battery is accessed in 4th battery voltage sampling one end resistance RV4
The anode of group, the other end access the 4th and the 5th battery detecting end BAT4, BAT5 of battery detection unit U3.
4th sampling filter one end capacitor CV4 is connect with the 4th battery voltage sampling resistance RV4, its other end and third are electric
The RV3 connection of cell voltage sampling resistor.Further, the 4th sampling filter one end capacitor CV4 of the present embodiment and the 4th cell voltage
One end that sampling resistor RV4 accesses the 4th or the 5th battery detecting end BAT4 or BAT5 of battery detection unit U3 connects, it is another
One end is connect with one end of third battery voltage sampling resistance RV3 access battery detection unit U3 third battery detecting end BAT3.
The series-connected cell group of the present embodiment controls protective module further include: loads the loading frame of battery pack.It is set in loading frame
It is equipped with the loading chamaer for loading battery unit.Loading chamaer is formed with limit and installs the load station of battery unit.Loading frame can be adopted
With plastic material injection molding, can also be formed as needed using other materials certainly.
To guarantee each battery unit safety, any battery unit is avoided over-voltage or under-voltage occur, then according to battery list
The battery voltage sampling resistance and sampling filter capacitor of first number setting respective numbers, and adopted according to corresponding divided battery group
With the battery detection unit U3 or battery detection unit U3 quantity of respective model, to battery unit or divided battery group or battery
Group is detected one by one.Battery detection unit U3 drives the corresponding battery unit of battery voltage sampling electrical resistance collection or divided battery
The voltage of group or battery pack, and the voltage that will test is compared with default normal voltage or operating voltage range, is judged
Pressure is under-voltage, is overcharged or Cross prevention by main control unit U1 control.
The series-connected cell group of the utility model controls protective module, detects battery unit composition by voltage detection unit
The voltage of different grouping battery pack carries out over-voltage or under-voltage detection judgement, and by main control unit U1 according to the battery detected
The over-discharge protection circuit for overcharge protection circuit or the load circuit connection that voltage pair is connect with external power supply or charger is controlled
System can carry out list by shutdown charge circuit or load circuit to be overcharged to battery unit or battery pack or Cross prevention
Branch additives for overcharge protection or single branch over can also carry out whole additives for overcharge protection or over to battery pack；Pass through
Electric current in current foldback circuit measure loop controls switching off load circuit by main control unit U1 and carries out electric discharge overcurrent protection；
The temperature that battery unit or battery pack are detected by high-temperature protection circuit judges whether the normal working temperature more than setting or fills
Electro-temperature is controlled by main control unit U1 and disconnects charge circuit or load circuit progress overheat protector.When charging, if detecting
Pressure or overcurrent, judgement overcharges or excess temperature or overcurrent, then main control unit U1 turns off charge circuit, and when charging, machine (load)
It can not work.When machine operation, main control unit U1 control detection assembled battery total voltage, battery unit over-discharge voltage, battery temperature,
Load current, if judging over-discharge or excess temperature or overcurrent, main control unit U1 turns off discharge loop.If there is battery unit over-discharge
Protection or single branch battery over-discharge protection, it is necessary to which machine could task again after charging.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of series-connected cell group controls protective module characterized by comprising battery pack that battery cells in series is formed and
The power circuit connecting with the battery pack, different battery units or different number battery unit connect to form divided battery group,
The cathode connection external power supply of the battery pack or connecting pin and the ground connection of charger, the power circuit include: and the electricity
Pond group connects and provides the device power supply circuit of device driving power, the main control unit for accessing device driving power and the electricity
Pool unit or divided battery group or battery pack connect and detect battery unit or divided battery group or battery voltage and will test
Signal is transferred to the main control unit and is compared the voltage detecting circuit of judgement, connect with the main control unit and battery pack
Overcharge protection circuit, the over-discharge protection circuit being connect with the main control unit, the load being connect with over-discharge protection circuit electricity
Road, the voltage detecting circuit include: the battery detection unit and battery for detecting battery unit or divided battery group or battery pack
Unit or the anode of divided battery group or battery pack, which connect and access the battery detection unit, controls inspection by battery detection unit
Survey voltage battery voltage sampling resistance and with corresponding battery voltage sampling resistance connection sampling filter capacitor, with it is described
Battery detection unit connect and access the main control unit switching tube Q10, the switching tube Q10 and the battery detection unit
The connection of output driving end, the common ground end ground connection of the battery detection unit, the overcharge protection circuit includes: that connection is outer
The connecting pin of portion's power supply or charger and access the main control unit and in working condition conducting switching tube Q4, with the master control
Unit connection and the shutdown of controlled overcharging state and the switching tube Q7 of working condition conducting, it connect with the switching tube Q7 and because switching
The connecting pin of the switching tube Q5 that pipe Q7 shutdown causes shutdown and working condition is connected, external power supply or charger passes through switching tube Q5
Access battery pack.
2. series-connected cell group according to claim 1 controls protective module, which is characterized in that 1 foot of the switching tube Q5
It is connect with the switching tube Q7, its 2 foot connection external power supply or charger connecting pin, 3 feet pass through single-way switch pipe D5 access institute
State battery pack；The electricity is accessed by switching tube Q5, single-way switch pipe D5 one-way conduction in the connecting pin of external power supply or charger
The anode of pond group, the switching tube Q5 are metal-oxide-semiconductor Q5, and 2 feet of the metal-oxide-semiconductor Q5 are the source electrode of metal-oxide-semiconductor Q5, its access external electrical
Source or the connecting pin of charger, 1 foot of the metal-oxide-semiconductor Q5 are the grid of metal-oxide-semiconductor Q5, and 3 feet of the metal-oxide-semiconductor Q5 are metal-oxide-semiconductor Q5
Drain electrode, between the source electrode and grid of the metal-oxide-semiconductor Q5 connect biasing resistor R28, the switching tube Q7 be triode Q7, it is described
Metal-oxide-semiconductor Q5 grid accesses the collector of the triode Q7, and the emitter ground connection of the triode Q7, its base stage access the master
Control unit is simultaneously controlled by main control unit, and the switching tube Q4 is triode Q4, and the base stage of the triode Q4 accesses external power supply
Or positive terminal, its emitter ground connection, its collector of charger connecting pin access the main control unit.
3. series-connected cell group according to claim 2 controls protective module, which is characterized in that described triode Q7, Q4 are
NPN type triode, the unidirectional conducting switch pipe D5 are diode D5, and the metal-oxide-semiconductor Q5 is P-channel enhancement type metal-oxide-semiconductor, described
The drain electrode of metal-oxide-semiconductor Q5 accesses the anode of battery pack by diode D5, and the diode D5 anode accesses the leakage of the metal-oxide-semiconductor Q5
The anode of the battery pack is accessed in pole, its cathode, and the base stage of the triode Q7 accesses the main control unit by resistance R25,
Device drive power supply accesses the collector of triode Q4 by resistance R13, and the triode Q4 base stage is connect by pull down resistor R27
Ground, base stage branch branch pass through the positive terminal of resistance R26 connection external power supply or charger connecting pin, its emitter is grounded, it
Collector accesses the main control unit.
4. series-connected cell group according to claim 1 controls protective module, which is characterized in that the over-discharge protection circuit packet
Include: access load circuit and connect the main control unit by main control unit be controlled in working condition conducting and over-discharge state turn off
Switching tube QM1, described load circuit one end is connect with the anode of the battery pack, the other end and the switching tube QM1 other end connect,
The switching tube QM1's further terminates the cathode into the battery pack, and the main control unit is accessed in described one end switching tube QM1
Control terminal.
5. series-connected cell group according to claim 4 controls protective module, which is characterized in that the switching tube QM1 is MOS
Pipe QM1, the switching tube QM1 are the enhanced metal-oxide-semiconductor of N-channel, access biased electrical between the grid and source electrode of the metal-oxide-semiconductor QM1
It hinders and accesses capacitor C18 between R36, its source electrode and drain electrode, the grid of the metal-oxide-semiconductor QM1 accesses the master control list by resistance R35
Member with by the PWM control terminal of pulse-width regulated control and regulation output voltage or power, the source electrode of the metal-oxide-semiconductor QM1 passes through limit
Leakage resistance RS1 accesses the cathode of the battery pack, and the battery electrode access external power supply or charger cathode connecting pin are simultaneously
Ground connection.
6. series-connected cell group according to claim 4 controls protective module, which is characterized in that further include: with the master control
Unit and the short-circuit protection circuit of battery pack connection, the overcurrent protection for connecting with the main control unit simultaneously measure loop electric current
Circuit corresponding to battery pack or battery unit is arranged to detect battery pack or battery cell temperature and feed back to the main control unit
Control carry out overheat protector high-temperature protection circuit, the short-circuit protection circuit include: with the main control unit connection and compared with
Input voltage and reference voltage control the switching tube QM1 on or off to feed back to main control unit to carry out short-circuit protection
The sampling resistor R39 and sampling resistor of comparator U4, the inverting input terminal of the access comparator U4 and connection switch pipe QM1
The output end of the filter capacitor C19, the comparator U4 of R39 connection access the main control unit, and the sampling resistor R39 other end is logical
It crosses current-limiting resistance and accesses the battery pack；The high-temperature protection circuit includes: is arranged to examine corresponding to battery pack or battery unit
It surveys battery pack or battery cell temperature and connect the temperature-sensitive that will test signal and feed back to the main control unit with the main control unit
Resistance NTC, the filter capacitor C12 for being connected in parallel on the both ends the thermistor NTC, the thermistor NTC other end ground connection.
7. series-connected cell group according to claim 6 controls protective module, which is characterized in that the power supply of the comparator U4
It terminates into device drive power supply, the power end of the comparator U4 extends a branch and is grounded by resistance R40, R41；The ratio
Between normal phase input end access resistance R40, R41 compared with device U4, common ground end ground connection；The sampling resistor R39 access is opened
The source electrode of pass pipe QM1, simultaneously branch accesses the cathode of the battery pack by current-limiting resistance RS1, and the current foldback circuit includes:
The filter capacitor C21, the sampling resistor R45 for accessing the sampling resistor R45 of the main control unit, being connect with sampling resistor R45
The test side of main control unit is accessed, the sampling resistor R45 other end is linked into the source electrode of the switching tube QM1；The thermistor
Device driving power is accessed by resistance R18 in the one end NTC, the end extends a branch and accesses the main control unit.
8. controlling protective module to series-connected cell group described in 7 any one according to claim 1, which is characterized in that the electricity
Source circuit further include: the start-up circuit for connecting with the main control unit and connecting with the device power supply circuit, the device supply
Circuit include: the switching tube Q2 being connect with the battery pack, the single-way switch pipe D1 being connect with the switching tube Q2, with it is described
The output end output of the voltage-stablizer U2, the switching tube Q1, the voltage-stablizer U2 that are connect with the battery pack of the connection of single-way switch pipe
Switching tube Q1, the main control unit are accessed by single-way switch pipe D2 in device drive power supply, external power supply or charger connecting pin
Switching tube Q1, the switching tube Q2 and the single-way switch pipe D1, which are accessed, by single-way switch pipe D4 connect one end outputting reference electricity
Pressure, the start-up circuit include: receive starting operation and by enabling signal be transferred to main control unit control load carry out classification or
Stepping work starts switch SW1, it is described start switch the one end SW1 ground connection, the other end accesses the main control unit, the other end draws
A branch accesses the device power supply circuit out.
9. series-connected cell group according to claim 8 controls protective module, which is characterized in that the switching tube Q2 is P ditch
The enhanced metal-oxide-semiconductor Q2 in road, the switching tube Q1 are NPN triode Q1, and described single-way switch pipe D1, D4, D2 are diode D2；Outside
The anode connection terminal of portion's power supply or charger is linked into triode by resistance R14, diode D2 one-way conduction, through resistance R11
The collector of the base stage of Q1, triode Q1 accesses the source electrode of metal-oxide-semiconductor Q2 through resistance R8, R7 and accesses the anode of the battery pack；
Main control unit output provide device driving power relative low voltage or negative voltage, through diode D4 one-way conduction, through electricity
Resistance R11 is linked into the base stage of triode Q1, and between grid access the resistance R7 and R8 of the metal-oxide-semiconductor Q2 and branch is through resistance R48
It is linked into and starts switch SW1, resistance R6 is provided between the base stage and emitter of the triode Q1, and connect by emitter
Ground, the drain electrode outputting reference voltage of the metal-oxide-semiconductor Q2 are simultaneously linked into voltage-stablizer through diode D1 one-way conduction, by resistance R10
The input terminal of U2, the output end output device driving power of the voltage-stablizer U2, voltage-stablizer U2 input terminal branch's branch warp
Capacitor C8 ground connection, the ground terminal ground connection of voltage-stablizer U2, its output end are grounded through capacitor C9, and the main control unit connects through diode D3
Enter to start switch one end of SW1, start switch the other end ground connection of SW1, described start switch is drawn between the diode D3
A branch accesses the grid of metal-oxide-semiconductor Q2 by resistance R48, through resistance R7 and the connecting pin R8 out, and the main control unit passes through current limliting
Resistance is linked into charge indication means.
10. controlling protective module to series-connected cell group described in 7 any one according to claim 1, which is characterized in that the electricity
The power end of pond detection unit accesses the anode of battery pack by resistance R20, and the anode of battery pack passes through resistance R20, capacitor C14
It accesses the common ground end of the battery detection unit and is grounded；Switching tube Q10 is the enhanced metal-oxide-semiconductor of N-channel, the battery inspection
The grid of metal-oxide-semiconductor Q10 is accessed at the output driving end for surveying unit by resistance R12, and the drain electrode of metal-oxide-semiconductor Q10 accesses the master control list
It is provided with resistance R21 between member, its source electrode ground connection, its grid and source electrode, battery voltage sampling resistance accesses battery detection unit
Battery detecting end, the battery voltage sampling resistance include: connect with first battery unit the first battery voltage sampling electricity
Resistance and according to different grouping battery pack the N+1 battery voltage sampling resistance being arranged corresponding to N divided battery group, it is described to adopt
Sample filter capacitor includes: the first sampling filter capacitor being arranged corresponding to the first battery voltage sampling resistance, Ji Yu N+1 electricity
The N+1 sampling filter capacitor that cell voltage sampling resistor is accordingly arranged, described first sampling filter capacitor one end and the first electricity
The connection of cell voltage sampling resistor, its other end ground connection；The N+1 sampling filter capacitor one end and the N+1 battery voltage sampling
Resistance connection, its other end are connect with n-th battery voltage sampling resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920621703.4U CN209658958U (en) | 2019-04-30 | 2019-04-30 | Series-connected cell group controls protective module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920621703.4U CN209658958U (en) | 2019-04-30 | 2019-04-30 | Series-connected cell group controls protective module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366880A (en) * | 2020-04-03 | 2020-07-03 | 深圳市超力源科技有限公司 | Circuit for intelligently identifying whether battery is connected or not |
| CN111668563A (en) * | 2020-06-17 | 2020-09-15 | 东莞新能安科技有限公司 | Electrochemical device and method for controlling same |
| CN112271702A (en) * | 2020-11-24 | 2021-01-26 | 重庆辉腾能源股份有限公司 | Intelligent working method of cascade battery protection circuit |
| CN114243806A (en) * | 2020-09-09 | 2022-03-25 | 高创(苏州)电子有限公司 | Battery charge-discharge control system and electronic equipment |
-
2019
- 2019-04-30 CN CN201920621703.4U patent/CN209658958U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366880A (en) * | 2020-04-03 | 2020-07-03 | 深圳市超力源科技有限公司 | Circuit for intelligently identifying whether battery is connected or not |
| CN111668563A (en) * | 2020-06-17 | 2020-09-15 | 东莞新能安科技有限公司 | Electrochemical device and method for controlling same |
| CN111668563B (en) * | 2020-06-17 | 2023-08-01 | 东莞新能安科技有限公司 | Electrochemical device and control method thereof |
| CN114243806A (en) * | 2020-09-09 | 2022-03-25 | 高创(苏州)电子有限公司 | Battery charge-discharge control system and electronic equipment |
| CN112271702A (en) * | 2020-11-24 | 2021-01-26 | 重庆辉腾能源股份有限公司 | Intelligent working method of cascade battery protection circuit |
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