CN209088562U - A kind of charge and discharge current limliting battery pack parallel control device of minimal switches - Google Patents
A kind of charge and discharge current limliting battery pack parallel control device of minimal switches Download PDFInfo
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- CN209088562U CN209088562U CN201821647432.1U CN201821647432U CN209088562U CN 209088562 U CN209088562 U CN 209088562U CN 201821647432 U CN201821647432 U CN 201821647432U CN 209088562 U CN209088562 U CN 209088562U
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Abstract
The utility model proposes a kind of charge and discharge current limliting battery pack parallel control devices of minimal switches, compared with prior art, the charge control and control of discharge of the utility model battery pack independently carry out, and can directly be powered with multichannel, and structure is simple, at low cost, flexible in application.Parallel Operation Control can be carried out to the battery pack of variety classes, different platform voltage, different manufacturers batch, different service life states.In addition, this system can be respectively controlled charging current and discharge current.Moreover the utility model power switch minimum number required while realizing charging and discharging currents control function, one of embodiment only uses two full-control type power electronic switching devices and two diodes, and another embodiment only uses three full-control type power electronic switching devices not have diode.The case of less power device is used while presently relevant data shows not can be realized above-mentioned function.
Description
Technical field
The utility model relates to a kind of battery protection and control fields, belong to the management system of the associated batteries such as lithium battery,
Especially to the application system of a variety of different battery pack parallel charge-discharge controls.
Background technique
With the development of lithium battery and energy storage technology, the requirement to battery management system is also higher and higher.Battery management mistake
Cheng Zhong, it is extremely important to the current limit of charge and discharge, especially the limitation of charging current under lithium battery cryogenic conditions must be controlled
System is accurate, otherwise can cause the growth of Li dendrite, eventually affect the safety of battery pack.In addition, different types of battery and
Different manufacturers, batch, state battery often used in application scenes, therefore more battery pack parallel charge-discharges control
The safety and be particularly important in terms of the service life that system is applied in battery pack parallel connection.
Since different types of battery stages voltage is different, so if two groups of different types of batteries directly and one
Meeting is played so that the high battery of platform voltage is not fully filled, and platform voltage is low can not put.Same kind of battery due to producer, batch
Secondary, state difference, there is also differences for characteristic curve, therefore can also cause same problem.
In terms of carrying out charge and discharge control to battery at present, two differential concatenations are especially mainly used in terms of Parallel Control
MOSFET forms bidirectional electronic switch or the control mode in parallel with electronic switch using mechanical switch, and structure is simple, cost
It is lower, but function is more single, is not suitable for the application in complexity power supply system.Such as Chinese patent CN101830269A,
CN203261014U, CN104242253A, CN104617613A, CN107425561A, CN105119361A individually disclose several
The various forms of two-way switch battery pack control circuits of kind and its control method.These schemes only can control two-way switch to charging
Or electric discharge carries out start-stop control.Due to two power electronic devices composition two-way switch, substantially with a mechanical switch
Such as contactor function is identical, therefore cannot achieve the independent control in multiple groups battery parallel connection.
In addition, common solution is additional increase charging current limiter module in order to solve the problems, such as charging current limiter, work as charging
When, charge switch is turned off, is that charging current is charged by current limliting module.On the one hand this settling mode increases system
Cost and complex degree of structure, still further aspect charging current limiter is smaller, be unable to gamut and electric current controlled, Er Qiewu
Method also controls discharge current comprehensively.
Chinese patent CN107154665A discloses a kind of battery control device using DC/DC converter, which adopts
The DC/DC converter formed with 8 high-speed power electronic switches and inductance, structure is extremely complex, at high cost, and needs non-
Often complicated logic control, therefore the requirement to controller is relatively high, control system is also extremely complex.Battery charging and discharging control
The cost ratio of battery pack shared by device is too high, the application of improper multiple groups battery.
Chinese patent CN205945144U discloses another battery control device for using DC/DC converter, the device
It is relatively simple for structure, but the charging process of battery pack can only be controlled, it is unable to control discharge process, especially works as battery
When overdischarge, which can not protect battery, and the overdischarge for easily causing lithium battery generates Li dendrite and causes battery
Internal short-circuit, safety problem are serious.
In conclusion simple two-way switch control model is fairly simple in the prior art, it is at low cost, but function list
One, the start-stop of charge and discharge can only be controlled, can not be applied in complicated energy-storage system, generally for current limliting simple double
To the current limiter of the upper low current in parallel of switch, the cost of battery control system is increased.And have the electricity of DC/DC converter
Pond charge-discharge control system structure is excessively complicated, and control difficulty is big and at high cost, the shared cost especially in low-power system
Large percentage, therefore be not suitable for the application in parallel of more battery packs.Furthermore multiple primary power sources are not accounted in existing technology
Power applications scene.
Utility model content:
The purpose of this utility model is to provide for a kind of charge and discharge current limliting battery pack parallel control device of minimal switches,
Compared with prior art, the charge control of the utility model battery pack and control of discharge independently carry out, and can be direct with multichannel
Power supply, structure are simple, at low cost, flexible in application.It can be to variety classes, different platform voltage, different manufacturers batch, difference
The battery pack of service life state carries out parallel Operation Control.In addition, this system can carry out respectively charging current and discharge current
Control.Moreover the utility model power switch minimum number required while realizing charging and discharging currents control function,
One of embodiment only uses two full-control type power electronic switching devices and two diodes, and another embodiment is only used
Three full-control type power electronic switching devices do not have diode.Presently relevant data shows not can be realized the same of above-mentioned function
When using less power device case.
The technical solution that the utility model is taken are as follows:
In order to achieve the above object, the charge and discharge current limliting battery pack Parallel Control dress of a kind of minimal switches of the utility model
It sets, including the first primary power source, the first DC power supply, load, the first battery pack, the second primary power source, the second DC power supply,
Mono- sub-cell of M, M DC power supply, the second battery pack, N battery pack, M and N are the integer greater than 1, which is characterized in that are also wrapped
Include the first counnter attack diode, the first parallel units, the second counnter attack diode, M counnter attack diode, the first parallel units, second
Parallel units, N parallel unit；First parallel units, the second parallel units, N parallel unit include bus negative terminal, mother
Line anode, battery negative terminal, battery positive；
First primary power source is connected with the first DC supply input, the cathode and the first direct current of the first counnter attack diode
The output negative pole of power supply is connected, and the second primary power source is connected with the second DC supply input, the cathode of the second counnter attack diode and
The output negative pole of second DC power supply is connected, and M primary power source is connected with M DC supply input, the yin of M counnter attack diode
Pole is connected with the output negative pole of M DC power supply；
First parallel units, the second parallel units, the battery negative terminal of N parallel unit, battery positive are respectively with
One battery pack, the second battery pack, the positive and negative anodes of N battery pack are connected；
The first counnter attack diode, the second counnter attack diode, the anode of M counnter attack diode and the first parallel units,
Second parallel units, N parallel unit bus negative terminal connected together with the negative terminal of load by negative DC bus；First is straight
Galvanic electricity source, the second DC power supply, the positive output end of M DC power supply and the first parallel units, the second parallel units, N parallel
The bus anode of unit is crossed positive direct-current bus with the anode of load and is connected together；
First parallel units, the second parallel units, N parallel unit are made of two-way DC/DC converter, can
Realize charge control, control of discharge, charging current limiter, electric discharge current limliting.
First parallel units, the second parallel units, N parallel unit have biswitch and three switch both of which.
The first parallel units, the second parallel units, the N parallel unit of the two switch-mode further include controller,
One power switch, the second power switch, first diode, the second diode, inductance；
First power switch, the second power switch can be by the power electronics controllable devices groups such as MOSFET or IGBT
At by taking MOSFET as an example, the drain electrode of the first power switch is connected with bus anode, the drain electrode of bus negative terminal and the second power switch
And the anode of first diode and the second diode links together, the source electrode of the second power switch is connect with battery negative terminal,
The cathode of first diode is connected with the source electrode of the first power switch and inductance, the other end of inductance and the second diode
Cathode is connected with battery positive；
First parallel units, the second parallel units, N parallel unit are only by two full-control type power devices and two
Power diode composition can carry out the difference that charge and discharge carry out start-stop control and charging current limiter and electric discharge current limliting to battery
Control, the duty ratio by changing the first power switch, the second power switch can be controlled separately charging current and discharge current
Size, the value range of duty ratio is 0-100% respectively.
The first parallel units, the second parallel units, the N parallel unit of three switching mode further include control unit,
First power switch tube, the second power switch tube, third power switch tube, inductance；
First power switch tube, the second power switch tube, third power switch tube can be by MOSFET or IGBT
Equal power electronics controllable devices composition, by taking MOSFET as an example, the first power switch tube, the second power switch tube, third power are opened
It closes pipe head and the tail to be connected in series, i.e., source electrode is connected with drain electrode, and the drain electrode of the first power switch tube is connect with bus anode, the first power
The source electrode of switching tube, the drain electrode of the second power switch tube, inductance connect together, and the other end of inductance connects battery positive, and second
The source electrode of power switch tube, the drain electrode of third power switch tube, bus negative terminal connect together, and the source electrode of third power switch tube connects
Connect battery negative terminal；
First parallel units, the second parallel units, N parallel unit are only made of three full-control type power devices,
The control respectively that charge and discharge carry out start-stop control and charging current limiter and electric discharge current limliting can be carried out to battery, by changing the
One power switch tube, the duty ratio of the second power switch tube can be controlled separately the size of charging current and discharge current, duty
The value range of ratio is 0-100% respectively, and the value of the duty ratio of third power switch tube only there are two 0 and 100%, controls
Battery switches on and off.
A kind of charge and discharge current limliting battery pack parallel control device of minimal switches passes through described first and receipts or other documents in duplicate
The control method that member, the second parallel units, N parallel unit are realized includes two switch-mode charging current limiter control strategy, double opens
Pass mode electric discharge Current limited Control strategy, three switching mode charging current limiter control strategies, three switching modes electric discharge Current limited Control strategy.
A kind of implementation method of the charge and discharge current limliting battery pack parallel control device of minimal switches, feature exist
In the two switch-mode charging current limiter control strategy realizes that steps are as follows:
Step A-1: controller detects battery parameter, and when needing to carry out charge control, the second power switch of control is always
Shutdown；
Step A-2: controller detects the charging current of battery pack, and controls the first power according to setting charging current value and open
The duty ratio of pass makes charging current detected value track setting charging current value；
Step A-3: when controller controls the conducting of the first power switch, electric current passes through DC power anode, the first power
Switch, inductance, battery pack, anti-paralleled diode, counnter attack diode are formed back to DC power cathode in the second power switch body
Road；
Step A-4: when controller controls the shutdown of the first power switch, electric current is opened by inductance, battery pack, the second power
Close internal anti-paralleled diode, first diode to inductance other end is formed into a loop；
Step A-5: when charging is complete, controller controls the first power switch and the shutdown of the second power switch.
The two switch-mode electric discharge Current limited Control strategy realizes that steps are as follows:
Step B-1: controller detects battery parameter, and when needing to carry out control of discharge, the first power switch of control is always
Shutdown；
Step B-2: controller detects the discharge current of battery pack, and is opened according to the second power of discharge current set value calculation
The duty ratio of pass makes discharge current detected value track discharge current setting value；
Step B-3: when controller controls the conducting of the second power switch, electric current passes through battery anode, inductance, the first function
Anti-paralleled diode, load, the second power switch to battery electrode are formed into a loop in rate switch body；
Step B-4: when controller controls the shutdown of the second power switch, electric current is by inductance, the first power switch body
Anti-paralleled diode, load, the second diode to inductance other end are formed into a loop；
Step B-5: when electric discharge is completed, controller controls the first power switch and the shutdown of the second power switch.
The three switching modes charging current limiter control strategy realizes that steps are as follows:
Step C-1: control unit detects battery parameter, when needing to carry out charge control, controls the second power switch tube
It is turned off always with third power switch tube；
Step C-2: control unit detects the charging current of battery pack, and controls the first power according to setting charging current value
The duty ratio of switching tube makes charging current detected value track setting charging current value；
Step C-3: when control unit controls the conducting of the first power switch tube, electric current passes through DC power anode, first
Power switch tube, inductance, battery pack, anti-paralleled diode, counnter attack diode are negative to DC power supply in third power switch tube body
Pole forming circuit；
Step C-4: when control unit controls the shutdown of the first power switch tube, electric current passes through inductance, battery pack, third function
Anti-paralleled diode in rate switching tube body, anti-paralleled diode is formed back to inductance other end in the second power switch tube body
Road；
Step C-5: when charging is complete, control unit controls the first power switch tube, the second power switch tube, third function
The shutdown of rate switching tube.
The three switching modes electric discharge Current limited Control strategy realizes that steps are as follows:
Step D-1: control unit detects battery parameter, when needing to carry out control of discharge, controls the first power switch tube
Always it turns off, while controlling third power switch tube and being connected always；
Step D-2: control unit detects the discharge current of battery pack, and according to the second power of discharge current set value calculation
The duty ratio of switching tube makes discharge current detected value track discharge current setting value；
Step D-3: when control unit controls the conducting of the second power switch tube, electric current is by battery anode, inductance, the
Two power switch tubes, third power switch tube to battery electrode are formed into a loop；
Step D-4: when control unit controls the shutdown of the second power switch tube, electric current is by battery anode, inductance, the
Anti-paralleled diode, load, third power switch tube to battery electrode are formed into a loop in one power switch tube body；
Step D-5: when electric discharge is completed, control unit controls the first power switch tube, the second power switch tube, third function
The shutdown of rate switching tube.
The beneficial effects of the utility model are:
Least power device has been used to realize the electrically independent Current limited Control function of charge and discharge, wherein biswitch charge and discharge current limliting electricity
Pond group parallel control device is used only two full-control type power electronics and switchs, two diodes, and power switch is minimum；Three switches fill
Three full-control type power electronic switches are used only in the current limliting battery pack parallel control device that discharges, without diode, power electronics device
Part sum is minimum；The charge control and control of discharge of battery pack can be carried out independently, avoid generating the circulation between battery pack；When
When battery pack is used as standby electricity operation, power supply directly powers to the load, and avoids the floating charges such as lithium battery from causing pair charge circuit disconnection
Reaction improves battery；When battery capacity reduction reaches lower limit, battery output can be cut off, is avoided because of overdischarge
Cause safety problem；Charging current can be adjusted according to temperature under cryogenic conditions, and low temperature large current charge is avoided to generate lithium
Dendrite causes safety problem；When electric discharge, Current limited Control can be carried out according to the property of primary power source, preferentially utilize primary power source.
Especially in new energy system, preferentially using wind energy and solar energy as system power supply, insufficient electric energy is supplied by battery
Electricity, therefore the available control of output electric current and voltage of battery.
Fig. 1 conventional batteries group controller schematic diagram；
Fig. 2 is multiple power supplies and battery pack parallel control device schematic diagram in the utility model；
Fig. 3 is biswitch parallel units schematic diagram in the utility model；
Fig. 4 is three switch in parallel cell schematics in the utility model；
Fig. 5 is 1 schematic diagram of biswitch parallel units charging process in the utility model；
Fig. 6 is 2 schematic diagram of biswitch parallel units charging process in the utility model；
Fig. 7 is biswitch parallel units charging process voltage and current waveform in the utility model；
Fig. 8 is 1 schematic diagram of biswitch parallel units discharge process in the utility model；
Fig. 9 is 2 schematic diagram of biswitch parallel units discharge process in the utility model；
Figure 10 is biswitch parallel units discharge process voltage and current waveform in the utility model；
Figure 11 is three switch in parallel unit charging processes, 1 schematic diagram in the utility model；
Figure 12 is three switch in parallel unit charging processes, 2 schematic diagram in the utility model；
Figure 13 is three switch in parallel unit charging process voltage and current waveform in the utility model；
Figure 14 is three switch in parallel cell discharge processes, 1 schematic diagram in the utility model；
Figure 15 is three switch in parallel cell discharge processes, 2 schematic diagram in the utility model；
Figure 16 is three switch in parallel cell discharge process voltage current waveform figure in the utility model.
In attached drawing, component representated by each label:
1, the first primary power source, the 2, first DC power supply, the 3, first counnter attack diode, 4, load, the 5, first parallel units,
6, the first battery pack, the 7, second primary power source, the 8, second DC power supply, the 9, second counnter attack diode, 10, M primary power source,
11, M DC power supply, 12, M counnter attack diode, the 13, second parallel units, the 14, second battery pack, 15, N parallel list
Member, 16, N battery pack, 100, controller, 101, bus negative terminal, 102, bus anode, 103, battery negative terminal, 104, battery just
End, the 105, first power switch, the 106, second power switch, 107, first diode, the 108, second diode, 109, inductance
One, 200, control unit, the 201, first power switch tube, the 202, second power switch tube, 203, third power switch tube, 204,
Inductance two.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
Traditional battery protecting plate, combiner and road device has the characteristics that common, charging control circuit and an electric discharge
Control circuit is shown in Fig. 1 by a bidirectional power semiconductor switch control.Although the circuit structure is simple, using inadequate
It flexibly, can not be using complicated power supply system.Especially in lithium battery applications, charging current is uncontrollable, when multiple groups battery is same
When charged in parallel when, since every group of battery charge is unbalanced, may causing certain group, battery charge is excessive causes fire
Calamity accident.In addition, when the temperature of the surroundings is low, charging current is limited, especially at 0 DEG C hereinafter, if also continuing
Large current charge can generate Li dendrite and cause battery short circuit, cause safety problem.People control in existing two-way switch thus
Current limiter is added additional on device.The general electric current of the current limiter charging and discharging currents specified much smaller than battery, not only increase volume
Outer cost, and it is not able to satisfy high-power applications occasion.
The present embodiment is the application that multiple groups distributed generation resource powers to the load, and have multiple groups variety classes, model,
The battery pack of state is powered as energy storage device to load 4, sees Fig. 2.Wherein primary power source 1,7,10 can be alternating current, diesel oil hair
Various forms of power supply units such as motor, wind energy, solar energy.It needs preferentially to utilize wind energy and solar energy etc. clear in practical applications
The clean energy, inadequate electric energy are provided by battery pack 6,14,16.
The multiple power supplies and battery pack parallel control device include the first primary power source 1, the first DC power supply 2, load
4, the first battery pack 6, the second primary power source 7, the second DC power supply 8, mono- sub-cell 10 of M, the 11, second electricity of M DC power supply
Pond group 14, N battery pack 16.A kind of charge and discharge current limliting battery pack parallel control device of minimal switches further includes first anti-
Anti- diode 3, the first parallel units 5, the second counnter attack diode 9, M counnter attack diode 12.Primary power source 1,7,10 respectively with
DC power supply 2,8,11 is connected, and the cathode of counnter attack diode 3,9,12 is connected with the cathode of DC power supply 2,8,11, prevents straight
Circulation is generated between galvanic electricity source 2,8,11.The anode of counnter attack diode 3,9,12 and the cathode of load 4 are connected to form DC bus
Cathode, anode and the anode with load 4 of DC power supply 2,8,11 are connected to form DC bus anode.M is the integer greater than 1.
Firstth parallel units 5, the second parallel units 13, N parallel unit 15 include bus negative terminal 101, bus
Anode 102, battery negative terminal 103, battery positive 104.Battery negative terminal 103, the battery positive 104 of parallel units 5,13,15 are distinguished
It is connected with the positive and negative anodes of battery pack 6,14,16.The bus negative terminals 101 of parallel units 5,13,15, bus anode 102 respectively with
DC bus anode is connected with DC bus cathode, sees Fig. 2.N is the integer greater than 1.
The parallel units 5,13,15 are directed to the charge and discharge application of battery pack, by the least two-way DC/ of device for power switching
DC converter is constituted, and can be realized charge control, control of discharge, charging current limiter, electric discharge current limliting.Can also by controller 100,
Voltage is adjusted in the voltage that control unit 200 detects straight edge line, so that stable DC busbar voltage, makes power supply system more
Stablize, meets the needs of high-performance supported safety to power supply stability.
Since each battery pack 6,14,16 is connected by parallel units 5,13,15 with DC bus respectively, and simultaneously receipts or other documents in duplicate
Member 5,13,15 can carry out charging and discharging currents control to battery pack 6,14,16 respectively, therefore.Although the kind of battery pack 6,14,16
Class, performance parameter, model, state, platform voltage are different, can also one it is used in parallel, and charging and discharging currents can be carried out
Weighted average, makes each battery pack 6,14,16 work in optimum state.And can according to the state-of-charge of battery, and
Environment temperature and battery temperature carry out charging and discharging currents control, can not only guarantee battery pack 6,14,16 using safe, may be used also
To improve its service life.
Embodiment as one preferred, Fig. 3 are that biswitch parallel units are illustrated in the utility model in the utility model
Figure, the embodiment only increase by two power diodes (first diode 107 and the second diode 108) in prior art basis
With a passive energy-storage travelling wave tube inductance 1, it is achieved that the independent charge and discharge control and charging current limiter of battery pack 6,14,16
Control and electric discharge Current limited Control, and DC bus-bar voltage control model when electric discharge.Using flexible is suitble to a variety of different storages
New energy can be preferentially utilized when application field, especially multiple new energy power supply power supplies, and multiple groups battery can be prevented
The current-unbalance problem of charging simultaneously in parallel, avoid because charging current it is excessive caused by the safety problems such as fire, and low
Electric current can be limited when warm to avoid generating Li dendrite influence safety and service life.
In the present embodiment, the parallel units 5,13,15 include controller 100, bus negative terminal 101, bus anode 102,
Battery negative terminal 103, battery positive 104, the first power switch 105, the second power switch 106, first diode the 107, the 2nd 2
Pole pipe 108, inductance 1.The controller 100 detects monomer battery voltage, the charging and discharging currents, ring of battery pack 6,14,16
The parameters such as border temperature, battery temperature, one 109 electric current of inductance calculate by internal CPU and logic judgment are to the first power
Switch 105, the second power switch 106 gate pole controlled.The controller 100 has communication module, can be with other simultaneously
Receipts or other documents in duplicate member 5,13,15 is communicated, and can also be communicated with host computer, is received corresponding control instruction and is reported this and receipts or other documents in duplicate
The status information of member 5,13,15 and battery pack 6,14,16.
In the present embodiment, first power switch 105, the second power switch 106 can be by MOSFET or IGBT etc.
Power electronics controllable devices composition, by taking MOSFET as an example, the drain electrode of the first power switch 105 is connected with bus anode 102, bus
The anode of the drain electrode of negative terminal 101 and the second power switch 106 and first diode 107 and the second diode 108 is connected to one
It rises, the source electrode of the second power switch 106 is connect with battery negative terminal 103, the cathode of first diode 107 and the first power switch
105 source electrode and inductance 1 is connected, the cathode and battery positive of the other end of inductance 1 and the second diode 108
104 connections.It can be distinguished using controller 100 by changing the duty ratio of the first power switch 105, the second power switch 106
The size of charging current and discharge current is controlled, the value range of duty ratio is 0- 100% respectively, can be filled to battery
Electric discharge carries out the control respectively of start-stop control and charging current limiter and electric discharge current limliting.
The parallel units 5,13,15 are only by two full-control type power devices and two power diodes and an inductance
Composition.Controller 100 control the first power switch 105, the second power switch 106 it is in an off state when, battery pack 6,14,16
It is isolated with load 4 and DC power supply 2,8,11, is in isolation.
If battery pack 6,14,16 is in 100%SOC state, the first power can be controlled by controller 100 and opened
Close 105 shutdowns, the conducting of the second power switch 106 makes battery pack 6,14,16 be in standby electricity condition, be simultaneously stopped to battery pack 6,
14,16 floating charge is carried out, floating charge bring side reaction is prevented, to improve battery.
When primary power source 1,7,10 is even powered off with 2,8,11 electricity shortage of DC power supply respectively, battery pack 6,14,
16 are instantaneously transferred to discharge condition by standby electricity condition automatically.Electric current passes through 6,14,16 anode of battery pack, inductance 1, the first power
Anti-paralleled diode, the 4, second power switch 106 of load to 6,14,16 cathode of battery pack are formed into a loop in 105 body of switch, see figure
8.Meanwhile controller 100 detects monomer battery voltage, discharge current, environment temperature, the battery temperature, electricity of battery pack 6,14,16
Feel the parameters such as one 109 electric currents.When electric discharge needs to carry out balanced to discharge current simultaneously if it is multiple groups battery, communication will be passed through
Route obtains current limliting instruction.Controller 100 calculates the second power according to discharge current setting value and discharge current detected value
Duty ratio needed for switch 106, and chop control is implemented to it.It, can be according to battery temperature characteristic pair when battery temperature is lower
6,14,16 discharge current of battery pack is limited, and prevents Li dendrite, influences 6,14,16 safety of battery pack and service life.It is detailed in
Fig. 8, Fig. 9 and Figure 10.
When 6,14,16 capacity of battery pack reaches minimum setting value, need to stop to discharge.Controller 100 controls the second function
Rate switch 106 turns off, and issues battery status to host computer, avoids safety and the service life caused by 6,14,16 overdischarge of battery pack
Problem.
When battery pack 6,14,16 needs charge control, controller 100 controls the shutdown of the second power switch 106, same to time control
Device 100 processed detects monomer battery voltage, charging current, environment temperature, battery temperature, one 109 electricity of inductance of battery pack 6,14,16
The parameters such as stream, open the first power according to duty ratio is calculated with battery behavior parameter and setting charging current value and detected value
It closes 105 and carries out chop control.When battery pack 6,14,16 is fully charged, the shutdown of the first power switch 105.When multiple groups battery simultaneously
When charging, the excessive damage caused by battery of charging current can be avoided by the control charging current and to battery life
It is influenced with caused by safety.It is detailed in Fig. 5, Fig. 6, Fig. 7.
Embodiment as one preferred, Fig. 4 are that three switch in parallel units are illustrated in the utility model in the utility model
Figure, which only increases 1 power switch tube (third power switch tube 203) in prior art basis and one passive
Energy-storage travelling wave tube inductance 209 is achieved that the independent charge and discharge control of battery pack 6,14,16 and charging current limiter control and electric discharge limits
Flow control, and DC bus-bar voltage control model when electric discharge.Using flexible is suitble to a variety of different stored energy application fields,
Especially multiple new energy power supply power supplies when can preferentially utilize new energy, and multiple groups battery can be prevented in parallel while being charged
Current-unbalance problem, avoid because charging current it is excessive caused by the safety problems such as fire, and can be limited in low temperature
Electric current avoids generating Li dendrite influence safety and service life.
In the present embodiment, the parallel units 5,13,15 include control unit 200, bus negative terminal 101, bus anode
102, battery negative terminal 103, battery positive 104, the first power switch tube 201, the second power switch tube 202, third power switch
Pipe 203, inductance 2 204.Described control unit 200 detects monomer battery voltage, the charging and discharging currents, ring of battery pack 6,14,16
The parameters such as border temperature, battery temperature, 2 204 electric current of inductance calculate by internal CPU and logic judgment are to the first power
Switching tube 201, the second power switch tube 202, third power switch tube 203 gate pole controlled.Described control unit 200 has
There is communication module, can be communicated, can also be communicated with host computer with other parallel units 5,13,15, receives corresponding
Control instruction report the status information of this parallel units 5,13,15 and battery pack 6,14,16.
In the present embodiment, first power switch tube 201, the second power switch tube 202, third power switch tube 203
It can be made of the power electronics controllable devices such as MOSFET or IGBT, by taking MOSFET as an example, the first power switch tube 201,
Two power switch tubes 202, third power switch tube 203 are connected in series from beginning to end, i.e., source electrode is connected with drain electrode, the first power switch tube
201 drain electrode is connect with bus anode 102, the source electrode of the first power switch tube 201, the drain electrode of the second power switch tube 202, electricity
Feel 2 204 to connect together, the other end of inductance connects battery positive 104, source electrode, the third power of the second power switch tube 202
The drain electrode of switching tube 203, bus negative terminal 101 connect together, and the source electrode of third power switch tube 203 connects battery negative terminal 103.Benefit
It can be controlled separately with control unit 200 by the first power switch tube 201 of change, the duty ratio of the second power switch tube 202
The size of charging current and discharge current, the value range of duty ratio are 0-100% respectively, can to battery carry out charge and discharge into
The control respectively of row start-stop control and charging current limiter and electric discharge current limliting.The value of the duty ratio of third power switch tube 203 is only
There are two 0 and 100%, switching on and off for battery is controlled.
The parallel units 5,13,15 are only made of three full-control type power devices and an inductance.Control unit 200 is controlled
Make the first power switch tube 201, the second power switch tube 202, third power switch tube 203 it is in an off state when, battery pack
6,14,16 are isolated with load 4 and DC power supply 2,8,11, are in isolation.
If battery pack 6,14,16 is in 100%SOC state, the first power can be controlled by control unit 200
Switching tube 201, the shutdown of the second power switch tube 202, the conducting of third power switch tube 203 make battery pack 6,14,16 be in standby electricity
State is simultaneously stopped and carries out floating charge to battery pack 6,14,16, prevents floating charge bring side reaction, so that improving battery uses the longevity
Life.
When primary power source 1,7,10 is even powered off with 2,8,11 electricity shortage of DC power supply respectively, battery pack 6,14,
16 are instantaneously transferred to discharge condition by standby electricity condition automatically.Electric current passes through 6,14,16 anode of battery pack, inductance 2 204, the first power
Anti-paralleled diode, load 4, third power switch tube 203 to 6,14,16 cathode of battery pack are formed into a loop in 201 body of switching tube,
See Figure 15.Meanwhile control unit 200 detects monomer battery voltage, the discharge current, environment temperature, battery of battery pack 6,14,16
The parameters such as temperature, 2 204 electric current of inductance.It, will when if it is multiple groups battery, electric discharge needs to carry out balanced to discharge current simultaneously
Current limliting instruction is obtained by communication line.Control unit 200 is calculated according to discharge current setting value and discharge current detected value
Duty ratio needed for second power switch tube 202 out, and chop control is implemented to it.It, can be according to electricity when battery temperature is lower
Pond temperature characterisitic limits 6,14,16 discharge current of battery pack, prevents Li dendrite, influences the peace of battery pack 6,14,16
The complete and service life.
When 6,14,16 capacity of battery pack reaches minimum setting value, need to stop to discharge.The control of control unit 200 second
Power switch tube 202 and third power switch tube 203 turn off, and issue battery status to host computer, avoid battery pack 6,14,16
Safety caused by overdischarge and life problems.It is detailed in Figure 14, Figure 15, Figure 16.
When battery pack 6,14,16 needs charge control, control unit 200 controls the second power switch tube 202 and third
Power switch tube 203 turns off, while control unit 200 detects the monomer battery voltage of battery pack 6,14,16, charging current, ring
The parameters such as border temperature, battery temperature, 2 204 electric current of inductance, according to battery behavior parameter and setting charging current value and inspection
Measured value calculates duty ratio and carries out chop control to the first power switch tube 201.When battery pack 6,14,16 is fully charged, first
Power switch tube 201 turns off.When multiple groups battery charges simultaneously, charging current mistake can be avoided by the control to charging current
It damages caused by battery greatly and is influenced caused by battery life and safety.It is detailed in Figure 11, Figure 12, Figure 13.
Embodiment as one preferred, it is described to use biswitch parallel units to the first parallel units 5, second and receipts or other documents in duplicate
Member 13,15 charging current limiter control strategy of N parallel unit realize that steps are as follows:
Step A-1: controller 100 detects 6,14,16 parameter of battery pack, when needing to carry out charge control, controls the second function
Rate switch 106 turns off always.Preferably, if the first power switch 105, the second power switch 106 use MOSFET power
Switch can control the second power switch 106 by controller 100 and be connected always, and effect is identical as the present embodiment.
Step A-2: controller 100 detects the charging current of battery pack 6,14,16, and is passed through according to setting charging current value
Pi regulator calculates the PWM control duty ratio of the first power switch 105, makes the tracking charging current setting of charging current detected value
Value.
Step A-3: when controller 100 controls the conducting of the first power switch 105, electric current is passing through DC power supply 2,8,11 just
Pole, the first power switch 105, inductance 1, anti-paralleled diode is (excellent in 106 body of the 6,14,16, second power switch of battery pack
Selection of land, when using MOSFET power switch, electric current can pass through the second power switch 106), counnter attack diode 3,9,12 is to straight
2,8,11 cathode of galvanic electricity source forming circuit.See 1 schematic diagram of biswitch parallel units charging process in Fig. 5 the utility model.
Step A-4: when controller 100 controls the shutdown of the first power switch 105, electric current passes through inductance 1, battery pack
6,14,16) (when preferably, using MOSFET power switch, electric current can be with for anti-paralleled diode in 106 body of the second power switch
Pass through the second power switch 106), first diode 107 to one 109 other end of inductance be formed into a loop；See that Fig. 6 sheet is practical new
2 schematic diagram of biswitch parallel units charging process in type.
Step A-5: when charging is complete, controller 100 controls the first power switch 105 and the second power switch 106 closes
It is disconnected.Battery pack 6,14,16 is isolated with DC bus, floating charge is avoided to influence the service life and safety problem of battery.
Fig. 7 is biswitch parallel units charging process voltage and current waveform in the utility model, when the first power switch
When 105 gate electrode drive signals Vg105 is high level, charging current iL rises；When the gate-drive of the first power switch 105
When signal Vg105 is low level, charging current iL decline.Controller 100 detects the electric current, filters out high-frequency signal, with
Setting charging current value is compared, and the PWM control duty ratio for calculating the first power switch 105 is output into the first power
The gate electrode drive signals Vg105 of switch 105.
Embodiment as one preferred, it is described to use biswitch parallel units to the first parallel units 5, second and receipts or other documents in duplicate
Member 13, N parallel unit 15 discharge, and steps are as follows for the realization of Current limited Control strategy:
Step B-1: controller 100 detects 6,14,16 parameter of battery pack, when needing to carry out control of discharge, controls the first function
Rate switch 105 turns off always.Preferably, if the first power switch 105, the second power switch 106 use MOSFET power
Switch can control the first power switch 105 by controller 100 and be connected always, and effect is identical as the present embodiment.
Step B-2: controller 100 detects the discharge current of battery pack 6,14,16, and is passed through according to discharge current setting value
Pi regulator calculates the PWM control duty ratio of the second power switch 106, makes the tracking discharge current setting of discharge current detected value
Value.
Step B-3: when controller 100 controls the conducting of the second power switch 106, electric current is passing through battery pack 6,14,16 just
Pole, inductance 1, anti-paralleled diode in 105 body of the first power switch (when preferably, using MOSFET power switch, electric current
The first power switch 105 can be passed through), load the 4, second power switch 106 to 6,14,16 cathode of battery pack forming circuit.In detail
See 1 schematic diagram of biswitch parallel units discharge process in Fig. 8 the utility model.
Step B-4: when controller 100 controls the shutdown of the second power switch 106, electric current passes through inductance 1, the first function
(when preferably, using MOSFET power switch, electric current can be opened anti-paralleled diode by the first power in 105 body of rate switch
Close 105), load the 4, second diode 108 to one 109 other end of inductance forming circuit.Double open is detailed in Fig. 9 the utility model
Close 2 schematic diagram of parallel units discharge process.
Step B-5: when electric discharge is completed, controller 100 controls the first power switch 105 and the second power switch 106 closes
It is disconnected.The safety and life problems for avoiding battery pack 6,14,16 from generating by overdischarge.
Figure 10 is biswitch parallel units discharge process voltage and current waveform in the utility model, when the second power switch
When 106 gate electrode drive signals Vg106 is high level, discharge current iL negative side is ramped up；When the door of the second power switch 106
When pole driving signal Vg106 is low level, the decline of discharge current iL opposite direction.Controller 100 detects the electric current, filters out
High-frequency signal is compared with discharge current setting value, and calculates the PWM control duty ratio output of the second power switch 106
Gate electrode drive signals Vg106 as the second power switch 106.
Embodiment as one preferred, it is described to use three switch in parallel units to the first parallel units 5, second and receipts or other documents in duplicate
Member 13,15 charging current limiter control strategy of N parallel unit realize that steps are as follows:
Step C-1: control unit 200 detects 6,14,16 parameter of battery pack, when needing to carry out charge control, control second
Power switch tube 202 and third power switch tube 203 turn off always.Preferably, if the first power switch tube 201, the second function
Rate switching tube 202, third power switch tube 203 are switched using MOSFET power, can control second by control unit 200
Power switch tube 202 and third power switch tube 203 are connected always, and effect is identical as the present embodiment.
Step C-2: control unit 200 detects the charging current of battery pack 6,14,16, and logical according to setting charging current value
The PWM control duty ratio that pi regulator calculates the first power switch tube 201 is crossed, charging current detected value tracking charging electricity is made
Flow setting value；
Step C-3: when control unit 200 controls the conducting of the first power switch tube 201, electric current by DC power supply 2,8,
11 anodes, the first power switch tube 201, inductance 2 204, battery pack 6,14,16, inverse parallel in 203 body of third power switch tube
Diode (when preferably, using MOSFET power switch, electric current can pass through third power switch tube 203), counnter attack diode
3, it 9,12 is formed into a loop to 2,8,11 cathode of DC power supply.It is detailed in three switch in parallel unit charging process in Figure 11 the utility model
1 schematic diagram.
Step C-4: when control unit 200 controls the shutdown of the first power switch tube 201, electric current is by inductance 2 204, electricity
Pond group 6,14,16, anti-paralleled diode in 203 body of third power switch tube, two pole of inverse parallel in 202 body of the second power switch tube
(when preferably, using MOSFET power switch, electric current can pass through third power switch tube 203, the second power switch tube to pipe
202) it is formed into a loop to 2 204 other end of inductance.Three switch in parallel unit charging processes 2 in Figure 12 the utility model are detailed in show
It is intended to.
Step C-5: when charging is complete, control unit 200 controls the first power switch tube 201, the second power switch tube
202, third power switch tube 203 turns off.Battery pack 6,14,16 is isolated with DC bus, floating charge is avoided to influence making for battery
With service life and safety problem.
Figure 13 is three switch in parallel unit charging process voltage and current waveforms in the utility model, when the first power switch
When the gate electrode drive signals Vg201 of pipe 201 is high level, charging current iL rises；When the gate pole of the first power switch tube 201
When driving signal Vg201 is low level, charging current iL decline.Control unit 200 detects the electric current, filters out high frequency letter
Number, it is compared with setting charging current value, and the PWM control duty ratio for calculating the first power switch tube 201 is output into
The gate electrode drive signals Vg201 of first power switch tube 201.
Embodiment as one preferred, it is described to use three switch in parallel units to the first parallel units 5, second and receipts or other documents in duplicate
Member 13, N parallel unit 15 discharge, and steps are as follows for the realization of Current limited Control strategy:
Step D-1: control unit 200 detects 6,14,16 parameter of battery pack, when needing to carry out control of discharge, control first
Power switch tube 201 turns off always, while controlling third power switch tube 203 and being connected always.Preferably, if the first power is opened
It closes pipe 201, the second power switch tube 202, third power switch tube 203 to switch using MOSFET power, control can be passed through
Unit 200 controls the synchronous rectification mode of the first power switch tube 201, the second power switch tube 202 using complementary conducting, effect
It is identical as the present embodiment.
Step D-2: control unit 200 detects the discharge current of battery pack 6,14,16, and logical according to discharge current setting value
The PWM control duty ratio that pi regulator calculates the second power switch tube 202 is crossed, discharge current detected value tracking electric discharge electricity is made
Flow setting value.
Step D-3: when control unit 200 controls the conducting of the second power switch tube 202, electric current by battery pack 6,14,
16 anodes, inductance 2 204, the second power switch tube 202, third power switch tube 203 to 6,14,16 cathode of battery pack are formed back
Road.It is detailed in three switch in parallel cell discharge processes, 1 schematic diagram in Figure 14 the utility model.
Step D-4: when control unit 200 controls the shutdown of the second power switch tube 202, electric current by battery pack 6,14,
16 anodes, inductance 2 204, in 201 body of the first power switch tube anti-paralleled diode (preferably, using MOSFET power switch
When, electric current can pass through the first power switch tube 201), load 4, third power switch tube 203 arrive 6,14,16 cathode of battery pack
Forming circuit.It is detailed in three switch in parallel cell discharge processes, 2 schematic diagram in Figure 15 the utility model.
Step D-5: when electric discharge is completed, control unit 200 controls the first power switch tube 201, the second power switch tube
202, third power switch tube 203 turns off.The safety and life problems for avoiding battery pack 6,14,16 from generating by overdischarge.
Figure 16 is three switch in parallel cell discharge process voltage current waveform figures in the utility model, when the second power switch
When the gate electrode drive signals Vg202 of pipe 202 is high level, discharge current iL negative side is ramped up；When the second power switch tube 202
Gate electrode drive signals Vg202 be low level when, discharge current iL opposite direction decline.Control unit 200 examines the electric current
It surveys, filters out high-frequency signal, be compared with discharge current setting value, and the PWM control for calculating the second power switch tube 202 accounts for
Gate electrode drive signals Vg202 of the sky than being output into the second power switch tube 202.
Claims (4)
1. a kind of charge and discharge current limliting battery pack parallel control device of minimal switches, including the first primary power source (1), the first direct current
Power supply (2), load (4), the first battery pack (6), the second primary power source (7), the second DC power supply (8), M primary power source
(10), M DC power supply (11), the second battery pack (14), N battery pack (16), M and N are the integer greater than 1, and feature exists
In further including the first counnter attack diode (3), the first parallel units (5), the second counnter attack diode (9), M counnter attack diode
(12), the first parallel units (5), the second parallel units (13), N parallel unit (15)；First parallel units (5),
Two parallel units (13), N parallel unit (15) include bus negative terminal (101), bus anode (102), battery negative terminal (103),
Battery positive (104)；
First primary power source (1) and the first DC power supply (2) input are connected, the cathode of the first counnter attack diode (3) and the
The output negative pole of one DC power supply (2) is connected, and the second primary power source (7) is connected with the second DC power supply (8) input, the second counnter attack
The cathode of diode (9) is connected with the output negative pole of the second DC power supply (8), M primary power source (10) and M DC power supply
(11) input is connected, and the cathode of M counnter attack diode (12) is connected with the output negative pole of M DC power supply (11)；
First parallel units (5), the second parallel units (13), N parallel unit (15) battery negative terminal (103), battery
Anode (104) is connected with the positive and negative anodes of the first battery pack (6), the second battery pack (14), N battery pack (16) respectively；
The first counnter attack diode (3), the second counnter attack diode (9), the anode of M counnter attack diode (12) are in parallel with first
Unit (5), the second parallel units (13), the bus negative terminal (101) of N parallel unit (15) and the negative terminal of load (4) pass through negative
DC bus connects together；First DC power supply (2), the second DC power supply (8), M DC power supply (11) positive output end
With the first parallel units (5), the second parallel units (13), the bus anode (102) of N parallel unit (15) and load (4)
Anode is crossed positive direct-current bus and is connected together；
First parallel units (5), the second parallel units (13), N parallel unit (15) are by two-way DC/DC converter structure
At, can be realized charge control, control of discharge, charging current limiter, electric discharge current limliting.
2. a kind of charge and discharge current limliting battery pack parallel control device of minimal switches as described in claim 1, which is characterized in that
First parallel units (5), the second parallel units (13), N parallel unit (15) have biswitch and three switch both of which.
3. a kind of charge and discharge current limliting battery pack parallel control device of minimal switches as claimed in claim 2, which is characterized in that
The first parallel units (5), the second parallel units (13), the N parallel unit (15) of the two switch-mode further include controller
(100), the first power switch (105), the second power switch (106), first diode (107), the second diode (108), electricity
Feel one (109)；
First power switch (105), the second power switch (106) can be controllable by power electronics such as MOSFET or IGBT
Device composition, by taking MOSFET as an example, the drain electrode of the first power switch (105) is connected with bus anode (102), bus negative terminal
(101) it is connect with the anode of the drain electrode of the second power switch (106) and first diode (107) and the second diode (108)
Together, the source electrode of the second power switch (106) is connect with battery negative terminal (103), the cathode and first of first diode (107)
The source electrode and inductance one (109) of power switch (105) are connected, the other end of inductance one (109) and the second diode (108)
Cathode and battery positive (104) connection；
First parallel units (5), the second parallel units (13), N parallel unit (15) are only by two full-control type power devices
Part and two power diode compositions can carry out charge and discharge to battery and carry out start-stop control and charging current limiter and discharge to limit
The control respectively of stream, the duty ratio by changing the first power switch (105), the second power switch (106) can be controlled separately
The size of charging current and discharge current, the value range of duty ratio are 0-100% respectively.
4. a kind of charge and discharge current limliting battery pack parallel control device of minimal switches as claimed in claim 2, which is characterized in that
The first parallel units (5), the second parallel units (13), the N parallel unit (15) of three switching mode further include that control is single
First (200), the first power switch tube (201), the second power switch tube (202), third power switch tube (203), inductance two
(204)；
First power switch tube (201), the second power switch tube (202), third power switch tube (203) can be by
The power electronics controllable devices such as MOSFET or IGBT composition, by taking MOSFET as an example, the first power switch tube (201), the second function
Rate switching tube (202), third power switch tube (203) head and the tail are connected in series, i.e., source electrode is connected with drain electrode, the first power switch tube
(201) drain electrode is connect with bus anode (102), the source electrode of the first power switch tube (201), the second power switch tube (202)
Drain electrode, inductance two (204) connect together, the other end of inductance connects battery positive (104), the second power switch tube (202)
Source electrode, the drain electrode of third power switch tube (203), bus negative terminal (101) connect together, third power switch tube (203)
Source electrode connects battery negative terminal (103)；
First parallel units (5), the second parallel units (13), N parallel unit (15) are only by three full-control type power devices
Part composition can carry out the control respectively that charge and discharge carry out start-stop control and charging current limiter and electric discharge current limliting to battery, pass through
Change the first power switch tube (201), the duty ratio of the second power switch tube (202) can be controlled separately charging current and electric discharge
The size of electric current, the value range of duty ratio are 0-100% respectively, and the value of the duty ratio of third power switch tube (203) is only
There are two 0 and 100%, switching on and off for battery is controlled.
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| CN201821647432.1U CN209088562U (en) | 2018-10-10 | 2018-10-10 | A kind of charge and discharge current limliting battery pack parallel control device of minimal switches |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245220A (en) * | 2018-10-10 | 2019-01-18 | 北京动力京工科技有限公司 | A kind of the charge and discharge current limliting battery pack parallel control device and control method of minimal switches |
| CN110912112A (en) * | 2019-12-24 | 2020-03-24 | 珠海格力电器股份有限公司 | Common bus circuit and fault detection method thereof |
| CN113002784A (en) * | 2021-04-06 | 2021-06-22 | 广东汇天航空航天科技有限公司 | Power device of electric manned aircraft and electric manned aircraft |
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2018
- 2018-10-10 CN CN201821647432.1U patent/CN209088562U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245220A (en) * | 2018-10-10 | 2019-01-18 | 北京动力京工科技有限公司 | A kind of the charge and discharge current limliting battery pack parallel control device and control method of minimal switches |
| CN110912112A (en) * | 2019-12-24 | 2020-03-24 | 珠海格力电器股份有限公司 | Common bus circuit and fault detection method thereof |
| CN113002784A (en) * | 2021-04-06 | 2021-06-22 | 广东汇天航空航天科技有限公司 | Power device of electric manned aircraft and electric manned aircraft |
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