CN108512269A - A kind of cell parallel balancing device and charge/discharge control method - Google Patents
A kind of cell parallel balancing device and charge/discharge control method Download PDFInfo
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- CN108512269A CN108512269A CN201810209356.4A CN201810209356A CN108512269A CN 108512269 A CN108512269 A CN 108512269A CN 201810209356 A CN201810209356 A CN 201810209356A CN 108512269 A CN108512269 A CN 108512269A
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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Abstract
A kind of cell parallel balancing device and charge/discharge control method, the cell parallel balancing device includes the battery tributary unit and control unit of multiple parallel connections, since the voltage detection unit in battery tributary unit can detect the voltage of the battery port of each battery tributary unit in real time, control unit is enable to know the charge/discharge situation of each battery, then the adjustment unit in each battery tributary unit is controlled to change the on off operating mode of each branch line, so that each battery being consistent property during charge or discharge, realize electric quantity balancing, also effectively avoid occurring between the battery of larger voltage difference uncontrollable high current mutually electric discharge and caused by the security risks such as damage battery situation.In addition, the battery balancing device can regulate and control the charge/discharge rate of each battery according to charge/discharge control method, to realize the consistency effect of rate, and then meet the versatility requirement when carrying out parallel charge-discharge of the battery of different performance parameter.
Description
Technical field
The present invention relates to battery technologies, and in particular to a kind of cell parallel balancing device and charge control method.
Background technology
With the development of microelectric technique, the equipment of miniaturization is increasing, and to power supply, more stringent requirements are proposed, lithium electricity
Chi Yin has the characteristics of high-energy density, high voltage, high circulation service life, quick charge, is answered in daily life therewith
With, lithium battery in mobile phone, laptop, electric tool, electric vehicle, street lamp stand-by power supply, boat lamp, household small electric appliance,
It can be described as maximum application group.
In practical applications, lithium battery exists mostly in the form of battery cell, and each battery cell can be designed to difference
Storing up electricity capacity and discharge voltage to adapt to the application demand of more occasions, it is logical when needing to increase battery capacity or increasing charge and discharge
When road, usually multiple battery cells are connected in the form of in parallel, to realize that the charge and discharge of multiple battery cells need, also
Need that (power conversion unit refers to for connecting external charging power supply by multiple battery cells cooperation power conversion unit in parallel
Either the voltage/current of load equipment is converted and adjustment circuit is common lithium battery charging circuit or power management chip)
To form complete power-supply system.See that Fig. 1, power-supply system include multiple channels, each channel includes a power conversion unit
With the battery cell of series connection with it, corresponding battery cell is individually controlled by power conversion unit and carries out charge and discharge operation, this
Kind of power-supply system can avoid performance between battery cell and mismatch that caused charge and discharge are unstable and electricity unbalance, but
It can lead to circuit structure complexity and high-cost situation because multiple power conversion units are added.See that Fig. 2, power-supply system include more
The battery unit of the battery cell of a parallel connection and one and the concatenated power conversion unit in battery bus road, i.e., multiple parallel connections shares
One power conversion unit, this power-supply system can reduce circuit complexity, but be had to the performance of each battery unit
It asks, each battery cell should have the matched internal resistance of cell and consistent charge/discharge rates, otherwise will appear battery cell and excessively fill
The electricity imbalance condition of electricity or over-discharge, and then the problem of cause the battery altering of power-supply system inconvenient, poor universality.
Invention content
Present invention mainly solves the technical issues of how to avoid multiple lithium battery parallel charge-discharges when caused electricity it is unbalance
Situation.To solve the above problems, the present invention provides a kind of cell parallel balancing device and charge/discharge control methods.
According in a first aspect, the present invention provides a kind of cell parallel balancing devices, including：
The battery tributary unit of multiple parallel connections, each battery tributary unit include for connect the battery port of battery,
The voltage detecting list of battery for the adjustment unit of the break-make battery tributary unit and for detecting the battery port
Member；
Control unit passes through electricity respectively for the voltage of the battery port detected by each battery tributary unit
The adjustment unit of pond tributary unit controls the break-make of each battery tributary unit, is connect with to balance each battery tributary unit
Electricity of the battery in charging and/or discharge process.
According to second aspect, the present invention provides the charge/discharge control methods for cell parallel balancing device, including with
Lower step：
Obtain the voltage of the battery port of each battery tributary unit；
Control each battery tributary unit by the adjustment unit of battery tributary unit respectively according to obtained voltage
Break-make, to balance the electricity of battery that each battery tributary unit is connect in charging and/or discharge process.
According to a kind of cell parallel balancing device and charge/discharge control method of above-described embodiment, cell parallel balance dress
Battery tributary unit and control unit including multiple parallel connections are set, since the voltage detection unit in battery tributary unit can be real
When detection battery unit in voltage where each batteries in parallel connection on branch line so that control unit can know each battery
Then charge/discharge situation controls the adjustment unit in battery tributary unit to change the on off operating mode of each branch line, so that
Each battery being consistent property during charge or discharge realizes electric quantity balancing, also effectively avoids the electricity of larger voltage difference
Occur between pond uncontrollable high current mutually electric discharge and caused by the damage security risks such as battery situation, also can effectively avoid
Other battery fills the situation of insatiable hunger or overdischarge.In addition, the battery balancing device also can adapt to the battery of different performance parameter
The application demand for carrying out parallel charge-discharge, the charge/discharge rate of each battery is regulated and controled according to charge/discharge control method, to realize
The consistency effect of rate, and then meet the versatility requirement of the battery of different performance parameter.
Description of the drawings
Fig. 1 is existing cell parallel charge-discharge circuit；
Fig. 2 is another existing parallel charge-discharge circuit；
Fig. 3 is the structural schematic diagram of cell parallel balancing device；
Fig. 4 is the circuit diagram of cell parallel balancing device；
Fig. 5 is the circuit diagram of another cell parallel balancing device；
Fig. 6 is the overall procedure schematic diagram of charge/discharge control method；
Fig. 7 is the detailed process schematic diagram of charge control method；
Fig. 8 is the detailed process schematic diagram of discharge control method；
Fig. 9 is the timing control schematic diagram of battary removal detection.
Specific implementation mode
Below by specific implementation mode combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can be without lifting an eyebrow recognize, which part feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
It can completely understand relevant operation according to the general technology knowledge of description and this field in specification.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or action can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
In general, phenomena such as charge/discharge process of battery is usually associated with voltage change, curent change and temperature change, special
It is not lithium battery, voltage can be gradually increasing in charging process, can be gradually reduced in discharge process, the rate of change of voltage
Related with the performance of its own, therefore, lithium battery in parallel can occur during charge/discharge because voltage changing rate is inconsistent
Caused by electricity unbalance, the present invention provides the device and method for solving the problems, such as this according to this phenomenon.
Fig. 3 is please referred to, this application discloses a kind of cell parallel balancing devices, including：Battery unit 10 and control unit
13, illustrate separately below.
Battery unit 10 includes the battery tributary unit of multiple parallel connections, and each battery tributary unit includes for connecting electricity
The battery port in pond, the battery for the adjustment unit of the break-make battery tributary unit and for detecting the battery port
Voltage detection unit.In one embodiment, see that Fig. 4, battery unit 10 include the first battery tributary unit 101 and second
Battery tributary unit 102, wherein the first battery tributary unit 101 includes for connecting the battery port 1012 of battery B1, being used for
The adjustment unit 1011 of the first battery of break-make tributary unit 101 and the voltage detection unit 1013 for detecting battery B1；The
Two battery tributary units 102 include for connecting the battery port 1021 of battery B2, for the tune of the second battery unit of break-make 102
Whole unit 1021 and voltage detection unit 1023 for detecting battery B2.It will illustrate the first battery tributary unit respectively below
101 and the second battery tributary unit 102.
The battery port of each battery tributary unit is arranged on the branch line of the battery tributary unit, for accessing electricity
Pond.The battery port 1012 of first battery tributary unit 101 is arranged on the branch line of the first battery tributary unit 101, is used for
Battery B1 is accessed on the branch line, equally, the battery port 1022 of the second battery tributary unit 102 is arranged in the second battery branch
On the branch line of road unit 102, for accessing battery B2 on the branch line.Here Battery Card is preferably used in battery port
Slot carries out replacement operation to facilitate to battery.
The voltage detection unit of each battery tributary unit includes bleeder circuit, the battery for detecting corresponding battery port
Voltage, bleeder circuit includes two resistance and a capacitance, is formed by circuit and corresponding battery after the two resistors are connected in series simultaneously
Connection connection, the place of being connected in series with of two resistance form partial pressure output end for connecting described control unit, the capacitance and wherein
One resistor coupled in parallel connection is to stablize the voltage of partial pressure output end.In one embodiment, see Fig. 4, resistance R3, resistance R6 and
Capacitance C2 forms the bleeder circuit 1013 of battery B1, and the partial pressure output end VB1 of the bleeder circuit 1013 is for exporting partial pressure electricity
It is depressed into control unit 13, the voltage of battery B1 is obtained by formula V1=VB1* (R3+R6)/R6；Resistance R2, resistance R5 and capacitance
C1 forms the bleeder circuit 1023 of battery B2, and the partial pressure output end VB2 of the bleeder circuit 1023 is for exporting branch pressure voltage extremely
Control unit 13 obtains the voltage of battery B2 by formula V2=VB2* (R2+R5)/R5.
The adjustment unit of each battery tributary unit includes switching circuit, and switching circuit is arranged in the battery tributary unit
On branch line, the on off operating mode for controlling the branch line, switching circuit include two MOS, preferably use PMOS tube, two
The source electrode of metal-oxide-semiconductor is connected, and the branch line of drain electrode one battery of access, grid is connected after being connected by the cathode of a resistance and power supply
It connects, grid is formed with control signal, the on off state for controlling the two metal-oxide-semiconductors.In one embodiment, see Fig. 4,
PMOS tube Q3, PMOS tube Q4 and resistance R4 form switching circuit 1011, and the control signal G1 of the switching circuit 1011 is low
PMOS tube Q3 and PMOS tube Q4 will be conducting state when level triggers, conversely, being cut-off state；PMOS tube Q1, PMOS tube Q2 and
Resistance R1 forms switching circuit 1021, the control signal G2 of the switching circuit 1021 when low level triggers PMOS tube Q3 and
PMOS tube Q4 will be conducting state, conversely, being cut-off state.
Voltage of the control unit 13 for the battery port detected by each battery tributary unit, passes through electricity respectively
The adjustment unit of pond tributary unit controls the break-make of each battery tributary unit, is connect with to balance each battery tributary unit
Electricity of the battery in charging and/or discharge process.In one embodiment, see that Fig. 4, control unit 13 can be microcontroller etc.
There are processing chip multiple signal input/output end ports, two of which signal input port to be used to be separately connected VB1 and VB2,
The analog voltage exported for reading bleeder circuit 1013 and bleeder circuit 1023 respectively, to obtain basis after digital voltage value
Correlation computations formula respectively obtains the voltage of battery B1 and battery B2；Two of which signal output port be respectively used to connection G1 and
G2, for sending control signal to switching circuit 1011 and switching circuit 1021 to control the switch of the two switching circuits respectively
State, and then control the energized state of switching circuit place branch line.Control unit 13 can control each battery tributary unit institute
The charging process of the battery of connection, the discharge process for the battery that also controllable each battery tributary unit is connected, separately below
Explanation.
When the battery that battery port is connected in each battery tributary unit charges, control unit 13 will be each
The voltage of battery port detected by battery tributary unit is compared with a standard voltage value, obtains difference, the difference that will be obtained
Value is compared with a preset range, and if more than the maximum value of the preset range, then it is open circuit to control corresponding battery tributary unit
State, it is channel status that the battery tributary unit is controlled when until obtained difference is in the preset range.
When making the battery that battery port is connected in each battery tributary unit be discharged, control unit 13 will be each
The voltage of battery port detected by battery tributary unit is compared with a standard voltage value, obtains difference, the difference that will be obtained
Value is compared with a preset range, if less than the minimum value of the preset range, it is open circuit to control corresponding battery tributary unit
State, it is channel status that the battery tributary unit is controlled when until obtained difference is in the preset range.
Further, this cell parallel balancing device further includes current detecting unit 15, the current detecting unit 15 setting
In parallel bus road, the electric current for detecting parallel bus road, so that control unit 13 is according to detected electric current
Judge the battery charging saturation that each battery tributary unit is connected.Referring to FIG. 4, in one embodiment, current detecting list
Member 15 includes resistance R7, resistance R8 and capacitance C3, and resistance R7 access parallel bus road is formed after resistance R8 and capacitance C3 series connection
Circuit be connected in parallel with resistance R7, the place of being connected in series with of resistance R8 and capacitance C3 are used to form current detecting output port Ichg
To be connect with control unit 13.One signal input port of control unit 13 connects current detecting output port Ichg, is used for
Analog voltage signal is converted after digital voltage signal according to formula I toIchg=VIchg/ R7 obtains the electric current of parallel bus road
Value.Control unit 13 judges that the concrete principle of battery charging saturation is according to detected electric current：Battery is with standard charging mistake
Cheng Jinhang charges, and carries out constant-current charge with setting electric current first, when cell voltage is raised to a rated value (such as 4.20V), then is changed to
Constant-voltage charge, holding charging voltage is the rated value, at this point, charging current is gradually reduced, when electric current drops to setting charging electricity
When a part (such as 1/10) of stream, charging terminates, and shows battery charging saturation；Thus, it is believed that charging current is reduced to one
It is full to be determined as that battery fills when definite value, and the minimum by the sum of minimum full charging stream of each battery in parallel as batteries in parallel connection is filled
Full electric current thinks that the Individual cells in batteries in parallel connection have reached when the electric current on parallel bus road is less than the minimum full charging stream
To charging saturation state；In addition, the minimum full charging, which can be manually set, flow to control unit 13 and as battery charging saturation
Rule of judgment.It will be understood by those of skill in the art that current detecting unit 15 can be not only arranged as shown in Figure 4 in parallel total
It in the anode circuit of circuit, can also be arranged on the electrode line road on parallel bus road, and reach technology effect identical with Fig. 4
Fruit.
Further, this cell parallel balancing device further includes power conversion unit 17, the power conversion unit 17 access
Parallel bus road, for connecting externally fed power supply or external load equipment, electric current for regulating and controlling parallel bus road or
Person's voltage, so that battery can receive the voltage or electric current of compound charging requirement in charging process, or so that battery exists
The exportable voltage or electric current for meeting electric discharge and requiring in discharge process.Since power conversion unit 17 is the prior art, here
No longer it is described in detail.
In another embodiment, NMOS tube can be used in the metal-oxide-semiconductor among switching circuit 1011 and switching circuit 1021,
The connection type of NMOS tube is identical as PMOS tube, is not discussed here.At this point, the control signal of switching circuit is in high electricity
NMOS tube will be conducting state when flat triggering, conversely, being cut-off state.
In another embodiment, as shown in figure 5, by the switching circuit of the switching circuit 1011 and battery B2 of battery B1
1021 are separately positioned in the anode circuit of battery B1 and battery B2, to control corresponding battery by the break-make of battery cathode circuit
Charge/discharge state.
Correspondingly, referring to FIG. 6, this application discloses a kind of charge and discharge control sides for cell parallel balancing device
Method, the specific implementation process of this method, will carry out specifically according to cell parallel balancing circuitry shown in Fig. 4 for ease of understanding
It is bright, the method comprising the steps of S200 to S300.
S200, control unit 13 obtain partial pressure value by the bleeder circuit in each battery tributary unit and calculate battery respectively
The voltage of port.In one embodiment, the partial pressure output of the partial pressure output end VB1 of bleeder circuit 1013 and bleeder circuit 1
End VB2 respectively obtains the partial pressure value of battery port 1013 and battery port 1023, and obtains the electricity of battery B1 according to correlation formula
The voltage of pressure and battery B2.
S300, control unit 13 are controlled by the adjustment unit of battery tributary unit each respectively according to obtained voltage
The break-make of a battery tributary unit, to balance battery that each battery tributary unit is connect in charging and/or discharge process
Electricity.In one embodiment, control unit 13 controls switching circuit 1011 according to the voltage of battery B1 and B2 and opens respectively
Powered-down road 1021 is to adjust the on off operating mode of corresponding branch line, to adjust separately the transmission of electricity state of battery B1 and B2, finally with
Balancing battery B1 and the B2 electricity during charge or discharge at the same time.
Wherein, step S300 includes the process that the battery connected to each battery tributary unit charges, and/or,
Make the process that the battery that each battery tributary unit is connected discharges, two processes respectively include step S311-S315 and
Step S21-S325, please respectively with reference to figure 7 and Fig. 8.
Referring to FIG. 7, the process that the battery connected to each battery tributary unit charges is：
S311, the battery connected to each battery tributary unit charge.Battery converting unit 15 is connected to outer
Portion's power supply, meanwhile, control unit 13 exports low level, the PMOS in switching circuit to switching circuit 1011 and switching circuit 1021
Manage in the conduction state, i.e., the conducting of branch line where battery tributary unit, battery converting unit 15 is respectively to battery B1 and electricity
Pond B2 transfer criterias DC voltage and standard DC current, to carry out standard charging to two batteries.In one embodiment,
By taking lithium battery as an example, standard charging process is：Trickle charge (low pressure preliminary filling) first is carried out to battery, charging current is setting electric current
1/10, after voltage is raised to 3V, with setting electric current carry out constant-current charge, when cell voltage is raised to 4.20V, be changed to constant-voltage charge,
Holding charging voltage is 4.20V, until when charging current drops to the 1/10 of setting charging current, charging terminates, due to standard
Charging process is the prior art, therefore, will not be illustrated to the specific work process of battery converting unit 15.
S312, control unit 13 obtain the voltage of battery B1 and B2, are compared with standard voltage value, obtain two respectively in real time
The difference of a cell voltage and standard voltage value.It in one embodiment, can be by the electricity of any battery in battery unit 10
Pressure is used as standard voltage value, can also be using the average voltage of all batteries in battery unit 10 as standard voltage value.
S313, when battery unit 10 is in charged condition, control unit 13 is pre- by the difference of gained in step S312 and one
If range is made comparisons (such as -50mV to+50mV), if difference within a preset range, shows electricity relative equilibrium between each battery,
It then continues as switching circuit 1011 and switching circuit 1021 exports low level, continue as battery B1 and B2 charging；If difference is less than
Minimum value-the 50mV of preset range then shows that the corresponding battery of the difference is low battery imbalance state, then continues as corresponding electricity
It charges in pond；If difference is more than the maximum value+50mV of preset range, show that the corresponding battery of the difference is the unbalance shape of high electricity
State, then the control switch output high level on branch line where the battery, is that the battery charges to stop, until the battery pair
The difference answered is within a preset range.
S314, the anti-overcharge protection of battery judge that charging saturation, control branch line are logical according to the electric current of cell parallel total line
Break to prevent battery overcharge.In one embodiment, control unit 13 obtains cell parallel from current detecting unit 15
Electric current in total line compares the electric current and a current standard value, to judge battery that each battery tributary unit is connected
Whether charging is saturated, and current standard value here refers to the minimum full charging of current detecting unit 15 above introduced in content
Stream, it will not be described here.Judge the comparison result of detected electric current and current standard value, if detected electric current be less than or
Equal to current standard value, then show that at least one battery is to fill full state in battery unit 10, then control unit 13 controls each
Battery tributary unit is off state, then detects the voltage of each battery again, is not up in step S304 and charges to voltage
The battery of process preset value carries out boost charge, and (branch line for readjusting the battery is channel status, continues as the battery
Power supply)；If detected electric current is more than current standard value, show that all batteries not up to fill full state in battery unit 10, then
Each battery charging is continued as, until detected current value is less than or equal to current standard value.
S315 sentences during control unit 13 exports control signal to each adjustment unit according to the voltage of battery
Whether power-off pond is removed.In one embodiment, see Fig. 9, control unit 13 is according to institute in step S311 to step S314
The method shown exports the control signal of varying level to switching circuit 1011 and switching circuit 1021, wherein low level is for touching
Switching circuit conducting is sent out, high level is disconnected for trigger switch circuit, to switching circuit 1011 or is switched in control unit 13
During circuit 1021 exports high level, control unit 13 compares the voltage of battery B1 and B2 with a zero respectively, when
When equal to or less than the zero, judge that corresponding battery is not present, then control switch of the control unit 13 on corresponding branch line
Exporting high level so that control switch is in off state, and it is off state to be equal to the branch line where making the battery, with
Convenient for continuing to adjust the electricity of battery on other branch lines.Step S315 is conducive in charge and discharge process, knows in time each
The existence of a battery continues as the situation hair of the branch line conveying electric energy where the battery when battery being prevented surprisingly to be removed
It is raw.
Referring to FIG. 8, making the process that the battery that each battery tributary unit is connected discharges be：
S321 makes the battery that each battery tributary unit is connected discharge.Battery conversion converting unit 15 is connected
In external load equipment, meanwhile, control unit 13 exports low level, switching circuit to switching circuit 1011 and switching circuit 1021
In PMOS tube it is in the conduction state, i.e., branch line where battery conducting so that battery B1 and battery B2 start to discharge, simultaneously
Direct current energy is conveyed to power conversion unit 17, power conversion unit 17, which is converted to direct current energy, to be met external load equipment and want
The electrical energy form asked is to be conveyed to external load equipment.
S322, control unit 13 obtain the voltage of battery B1 and B2, are compared with standard voltage value, obtain two respectively in real time
The difference of a cell voltage and standard voltage value.Specific implementation process please refers to step S312.
S323, when battery unit 10 is in electric discharge situation, control unit 13 is pre- by the difference of gained in step S303 and one
If range is made comparisons (such as -50mV to+50mV), if difference within a preset range, shows electricity relative equilibrium between each battery,
It then continues as switching circuit 1011 and switching circuit 1021 exports low level, continue that battery B1 and B2 is made to discharge；If difference is less than
Minimum value-the 50mV of preset range then shows that the corresponding battery of the difference is low battery imbalance state, then to branch where the battery
Control switch output high level on circuit, to stop making the battery discharge, until the corresponding difference of the battery is in preset range
It is interior；If difference is more than the maximum value+50mV of preset range, show that the corresponding battery of the difference is high electricity imbalance state, then
Continue to make corresponding battery discharge.
S324, the anti-Cross prevention of battery judge overdischarge according to the voltage of each battery, and control branch line break-make is to prevent
Battery over-discharge.In one embodiment, control unit 13 obtains the voltage of battery B1 and battery B2 in real time, when what is obtained
When voltage is less than a discharge threshold (limits value that voltage declines when discharge threshold refers to battery discharge), then show corresponding battery
Not enough power supply is over-discharge state, then the switching circuit on branch line where the battery exports high level to disconnect the branch
Circuit.
S325 sentences during control unit 13 exports control signal to each adjustment unit according to the voltage of battery
Whether power-off pond is removed.Step S315 specifically is please referred to, is not discussed here.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not limiting
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (11)
1. a kind of cell parallel balancing device, which is characterized in that including：
The battery tributary unit of multiple parallel connections, each battery tributary unit include for connecting the battery port of battery, being used for
The voltage detection unit of the adjustment unit of the break-make battery tributary unit and the battery for detecting the battery port；
Control unit passes through battery branch respectively for the voltage of the battery port detected by each battery tributary unit
The adjustment unit of road unit controls the break-make of each battery tributary unit, to balance the battery that each battery tributary unit is connect
Electricity in charging and/or discharge process.
2. cell parallel balancing device as described in claim 1, which is characterized in that the voltage detection unit includes partial pressure electricity
Road, the bleeder circuit include two resistance and a capacitance, are formed by circuit and a battery port after the two resistors are connected in series simultaneously
The place of being connected in series with of connection connection, two resistance forms partial pressure output end, for exporting partial pressure to described control unit to calculate this
The voltage for the battery that battery port is connected, the capacitance are connect with one of resistor coupled in parallel to stablize the partial pressure output end
Voltage.
3. cell parallel balancing device as described in claim 1, which is characterized in that the adjustment unit includes switching circuit,
The switching circuit includes two MOS, and the source electrode of two metal-oxide-semiconductors is connected, the branch of drain electrode one battery tributary unit of access
Circuit, grid are connected after being connected by the cathode of a resistance and power supply, and the grid is connect with described control unit to control
The on off state of two metal-oxide-semiconductors, to control the break-make of corresponding battery tributary unit.
4. cell parallel balancing device as described in claim 1, which is characterized in that further include current detecting unit, the electricity
Stream detection unit is used to detect the electric current of parallel bus road, and described control unit judges each battery branch list according to the electric current
The battery charging saturation that member is connected.
5. cell parallel balancing device as claimed in claim 4, which is characterized in that the current detecting unit includes resistance
R7, resistance R8 and capacitance C3, resistance R7 access parallel bus road are formed by circuit and resistance after resistance R8 and capacitance C3 series connection
R7 is connected in parallel, and the place of being connected in series with of resistance R8 and capacitance C3 form current detecting output end, for defeated to described control unit
Go out current detection signal to calculate the electric current on the parallel bus road.
6. cell parallel balancing device as described in claim 1, which is characterized in that further include power conversion unit, the electricity
Source converting unit accesses the parallel bus road, for connecting externally fed power supply or external load equipment, for regulating and controlling
State the electric current or voltage of parallel bus road.
7. cell parallel balancing device as claimed in any one of claims 1 to 6, which is characterized in that
When the battery that battery port is connected in each battery tributary unit charges, described control unit is by each electricity
The voltage of battery port detected by the tributary unit of pond is compared with a standard voltage value, obtains difference, the difference that will be obtained
It is compared with a preset range, if more than the maximum value of the preset range, then it is open circuit to control corresponding battery tributary unit
State, it is channel status that the battery tributary unit is controlled when until obtained difference is in the preset range；
When making the battery that battery port is connected in each battery tributary unit be discharged, described control unit is by each electricity
The voltage of battery port detected by the tributary unit of pond is compared with a standard voltage value, obtains difference, the difference that will be obtained
It is compared with a preset range, if less than the minimum value of the preset range, it is open circuit to control corresponding battery tributary unit
State, it is channel status that the battery tributary unit is controlled when until obtained difference is in the preset range.
8. a kind of charge/discharge control method for cell parallel balancing device, the cell parallel balancing device is as right is wanted
Seek 1-7 any one of them devices, which is characterized in that the method includes：
Obtain the voltage of the battery port of each battery tributary unit；
Control the logical of each battery tributary unit by the adjustment unit of battery tributary unit respectively according to obtained voltage
It is disconnected, to balance the electricity of battery that each battery tributary unit is connect in charging and/or discharge process.
9. charge/discharge control method as claimed in claim 8, which is characterized in that described to be led to respectively according to obtained voltage
The adjustment unit of battery tributary unit is crossed to control the break-make of each battery tributary unit, to balance each battery tributary unit institute
Electricity of the battery connect in charging and/or discharge process, including：
When the battery connected to each battery tributary unit charges, it is access shape to control corresponding battery tributary unit
State compares the voltage of the battery port detected by each battery tributary unit with a standard voltage value, obtains difference, will
Obtained difference is compared with a preset range, if more than the maximum value of the preset range, then controls corresponding battery branch
Unit is off state, and it is channel status that the battery tributary unit is controlled when until obtained difference is in the preset range；
When the battery for making each battery tributary unit be connected is discharged, it is access shape to control corresponding battery tributary unit
The voltage of battery port detected by each battery tributary unit and a standard voltage value are done ratio by state, described control unit
Compared with obtained difference and a preset range are compared, if less than the minimum value of the preset range, controlled by acquisition difference
Corresponding battery tributary unit is off state, and the battery branch list is controlled when until obtained difference is in the preset range
Member is channel status.
10. charge/discharge control method as claimed in claim 8, which is characterized in that further include：
When the battery connected to each battery tributary unit charges, the electric current on parallel bus road is obtained, by the electricity
Stream is compared with a current standard value, to judge whether battery that each battery tributary unit is connected charges saturation, if so,
It is off state to control each battery tributary unit, the voltage of the battery port of each battery tributary unit is detected again, to electricity
Battery of the pressure beyond the preset range carries out boost charge, conversely, then continuing as the electricity that each battery tributary unit is connected
It charges in pond；
When the battery for making each battery tributary unit be connected is discharged, by the electricity detected by each battery tributary unit
The voltage of pond port is compared with a discharge threshold, if being less than the discharge threshold, controlling corresponding battery tributary unit is
Off state, to prevent battery over-discharge.
11. the charge/discharge control method as described in claim 8-10, which is characterized in that further include battary removal detection step
Suddenly：
The voltage of the battery port of each battery tributary unit is compared with a zero, when equal to or less than the zero,
It is off state then to control corresponding battery tributary unit.
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