CN109591627A - Energy storage system of electric automobile - Google Patents
Energy storage system of electric automobile Download PDFInfo
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- CN109591627A CN109591627A CN201811480871.2A CN201811480871A CN109591627A CN 109591627 A CN109591627 A CN 109591627A CN 201811480871 A CN201811480871 A CN 201811480871A CN 109591627 A CN109591627 A CN 109591627A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims abstract description 71
- 230000001172 regenerating effect Effects 0.000 claims abstract description 12
- 238000009825 accumulation Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 12
- 230000001133 acceleration Effects 0.000 claims description 9
- 230000006837 decompression Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000003749 cleanliness Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000002459 sustained effect Effects 0.000 description 13
- 230000008901 benefit Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000009194 climbing Effects 0.000 description 3
- 239000005955 Ferric phosphate Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229940032958 ferric phosphate Drugs 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The application relates to an electric automobile energy storage system, include: the system comprises a storage battery pack, a super capacitor pack, a first DC-DC converter, a second DC-DC converter and a motor driving system; the storage battery pack and the first DC-DC converter are connected in parallel to form a first power supply circuit; the super capacitor bank and the second DC-DC converter are connected in parallel to form a second power supply circuit; the first power supply circuit and the second power supply circuit are connected in parallel and then supply power to a motor driving system of the electric automobile; when the electric automobile works normally, the storage battery pack provides energy for the motor driving system through the boosting mode of the first DC-DC converter; when the motor driving system works in a regenerative braking state, the voltage reduction mode of the first DC-DC converter performs voltage reduction charging on the storage battery pack. The method and the device can improve the performance of the driving motor and can keep the voltage of the storage battery stable in a certain range.
Description
Technical field
This application involves electric car field more particularly to a kind of electric car energy-storage systems.
Background technique
With the development of the times, pure electric vehicle can become the green novel energy source automobile of most development prospect.Novel electric at present
The energy-storage system of electrical automobile mostly be lithium titanate battery or ferric phosphate lithium cell, both batteries comparatively, metatitanic acid
Although lithium battery has the advantages that high energy ratio but the service life is not long and ferric phosphate lithium cell does not have the advantages of high energy ratio still
It is durable.
And above two battery it is maximum the disadvantage is that short time etc can not quick charge and discharge, just influence automobile in this way and climb
The performances such as slope acceleration.
Summary of the invention
In order to solve the above-mentioned technical problem or it at least is partially solved above-mentioned technical problem, this application provides a kind of electricity
Electrical automobile energy-storage system.
In a first aspect, this application provides a kind of electric car energy-storage systems, comprising: battery group, super capacitor group,
One DC-DC converter, the second DC-DC converter and motor driven systems；
The battery group the first power supply circuit of formation in parallel with first DC-DC converter；The super capacitor group
The second power supply circuit of formation in parallel with second DC-DC converter；First power supply circuit and second power supply circuit
It powers after parallel connection for the motor driven systems of electric car；
When electric car works normally, the battery group is by the boost mode of first DC-DC converter
The motor driven systems provide energy；When motor driven systems work is under regenerative braking state, the first DC-
The decompression mode of DC converter carries out decompression charging to the battery group.
With reference to first aspect, in the first possible embodiment of the application first aspect, the first DC-DC conversion
Device includes the first battery terminal connections, the second battery terminal connections, the first feeder ear and the second feeder ear；
First battery terminal connections are connect with the anode of the battery group, second battery terminal connections and the storage
The cathode of battery pack connects；
First feeder ear and second feeder ear are connect with the DC bus side of the motor driven systems.
With reference to first aspect, in second of possible embodiment of the application first aspect, the first DC-DC conversion
Device includes: first capacitor, the first inductance, first switch tube, the first freewheeling diode and the second freewheeling diode；
The first capacitor is in parallel with the battery group, be formed by the first parallel circuit successively with first inductance
It connects with the first switch tube, the base stage of the first switch tube connect with the PWM controller of the electric car, and described the
One freewheeling diode is in parallel with the emitter and collector of the first switch tube, the first parallel circuit and the first inductance string
It is in parallel with second freewheeling diode after connection；
Motor driven systems work under regenerative braking state, the PWM controller to the first switch tube into
Row PWM control, when the first switch tube is turned on, the motor driven systems are by the braking energy of the DC bus feedback
First induction charging, the first inductance accumulation of energy, while charging to battery group, inductive current linear rise；When
When first switch tube disconnects, first inductance gives the battery charging, the first electricity by second freewheeling diode
Electrification cleanliness reduces.
With reference to first aspect, in the third possible embodiment of the application first aspect, second switch and second
Capacitor；The emitter and collector of the second switch is in parallel with second freewheeling diode, the second switch
Base stage is connect with the PWM controller, is formed by first parallel circuit, first inductance and the first switch tube
First series circuit is in parallel with second capacitor；
Motor driven systems work drive at a constant speed or acceleration mode under, first switch tube is held off, the PWM
Controller carries out PWM control to the second switch, and when second switch conducting, battery group gives the first induction charging,
First inductance accumulation of energy, the second capacitor are motor driven systems power supply by the DC bus；When second switch disconnects
When, battery group and the first inductance pass through the first freewheeling diode as load supplying, while being the second capacitor charging, the first inductance
Release electric energy electric current linearly reduces.
With reference to first aspect, in the 4th kind of possible embodiment of the application first aspect, the 2nd DC-DC conversion
Device includes third battery terminal connections, the 4th battery terminal connections, third feeder ear and the 4th feeder ear；
The third battery terminal connections are connect with one end of the super capacitor group, the 4th battery terminal connections with it is described
The other end of super capacitor group connects；
The third feeder ear and the 4th feeder ear are connect with the DC bus side of the motor driven systems.
With reference to first aspect, in the 5th kind of possible embodiment of the application first aspect, the 2nd DC-DC conversion
Device includes: third capacitor, the second inductance, third switching tube, third freewheeling diode and the 4th freewheeling diode；
The third capacitor is in parallel with the super capacitor group, and it is successively electric with described second to be formed by the second parallel circuit
Sense and third switching tube series connection, the base stage of the third switching tube is connect with the PWM controller of the electric car, described
Third freewheeling diode is in parallel with the emitter and collector of the third switching tube, the second parallel circuit and second inductance
It is in parallel with the 4th freewheeling diode after series connection；
Motor driven systems work under regenerative braking state, the PWM controller to the third switching tube into
Row PWM control, when the conducting of third switching tube, the motor driven systems are by the braking energy of the DC bus feedback
Second induction charging, the second inductance accumulation of energy, while charging to super capacitor group, inductive current linear rise；
When third switching tube disconnects, second inductance is charged by the 4th freewheeling diode to the super capacitor group, the
Two inductive currents linearly reduce.
With reference to first aspect, in the 6th kind of possible embodiment of the application first aspect, the 2nd DC-DC conversion
Device includes: the 4th switching tube and the 4th capacitor；The emitter and collector of 4th switching tube and two pole of the 4th afterflow
Pipe is in parallel, and the base stage of the 4th switching tube is connect with the PWM controller, by second parallel circuit, second electricity
The second series circuit that sense and the 4th switching tube are formed is in parallel with the 4th capacitor；
Motor driven systems work drive at a constant speed or acceleration mode under, third switching tube is held off, the PWM
Controller carries out PWM control to the 4th switching tube, and when the conducting of the 4th switching tube, super capacitor group is filled to the second inductance
Electricity, the second inductance accumulation of energy, the 4th capacitor are motor driven systems power supply by the DC bus；When the 4th switching tube is disconnected
When opening, super capacitor group and the second inductance are load supplying by third freewheeling diode, while being the 4th capacitor charging, second
Inductance release electric energy electric current linearly reduces.
With reference to first aspect, in the 7th kind of possible embodiment of the application first aspect, the first DC-DC conversion
Device is bi-directional half bridge DC converter.
With reference to first aspect, in the 8th kind of possible embodiment of the application first aspect, the 2nd DC-DC conversion
Device is bi-directional half bridge DC converter.
With reference to first aspect, in the 9th kind of possible embodiment of the application first aspect, the motor driven systems
It include: three inverters and controller, three inverters are connect with the controller.
Above-mentioned technical proposal provided by the embodiments of the present application has the advantages that compared with prior art
Electric car energy-storage system provided by the embodiments of the present application, using super capacitor group as supplementary energy, uses DC-
DC converter connection source side and DC bus side, the performance that driving motor can be improved can also keep storing in a certain range
The stabilization of battery terminal voltage.When motor operates in the case of regenerative braking, the energy of feedback can be turned by the first DC-DC
Parallel operation and the second DC-DC converter feed back to battery group to charge to it.However battery charging process generally compared with
Slowly, so super capacitor group will be used quickly to absorb feedback energy.Similarly super capacitor group is also by matching
First DC-DC converter and the second DC-DC converter are parallel on DC bus, fast using super capacitor group charge rate in this way
The advantages of recycle the braking energy of electric car in time, provide electric car starting using the big feature of discharge current, accelerate and
Peak power needed for climbing, it is clear that can not only be completed well using the first DC-DC converter and the second DC-DC converter
The two-way flow of energy, and can well by busbar voltage maintain one it is metastable within the scope of, protection electric power storage
Also the driveability of motor is significantly improved while pond.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without any creative labor, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of electric car energy-storage system provided by the embodiments of the present application；
Current trend schematic diagram when Fig. 2 is the decompression charge mode of the first DC-DC converter provided by the embodiments of the present application；
Current trend schematic diagram when Fig. 3 is the step-up discharge mode of the first DC-DC converter provided by the embodiments of the present application；
Fig. 4 is the decompression charge mode schematic diagram of the second DC-DC converter provided by the embodiments of the present application；
Fig. 5 is the step-up discharge pattern diagram of the second DC-DC converter provided by the embodiments of the present application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the application, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
Fig. 1 is a kind of structural schematic diagram of electric car energy-storage system provided by the embodiments of the present application；The embodiment of the present application
A kind of electric car energy-storage system is provided, as described in Figure 1, the electric car energy-storage system includes: battery group 11, super electricity
Appearance group 12, the first DC-DC converter 13, the second DC-DC converter 14 and motor driven systems 15；
The battery group 11 first power supply circuit of formation in parallel with first DC-DC converter 13；The super electricity
Second power supply circuit of formation in parallel with second DC-DC converter 14 of appearance group 12；First power supply circuit and described second
It powers after power supply circuit is in parallel for the motor driven systems 15 of electric car；
When electric car works normally, boosting mould that the battery group 11 passes through first DC-DC converter 13
Formula is that the motor driven systems 15 provide energy battery group by converter boost is supplied to DC bus one surely at this time
Fixed DC voltage；When the motor driven systems 15 work is under regenerative braking state, converter would operate in decompression mould
Formula, DC bus be depressured to the battery group 11 and be filled by the decompression mode of first DC-DC converter 13 at this time
Electricity；When bi-directional half bridge converter works in boost mode, switching tube S1 is turned off always, switching tube S2 work under PWM control mode
Make；And when working in decompression mode, S2 is in an off state always, and S1 works under PWM control mode.So the one of converter
Another is then off when a power switch tube works.
In the embodiment of the present application, first DC-DC converter 13 includes the first battery terminal connections, the second battery connects
Connect end, the first feeder ear and the second feeder ear；
The anode of first battery terminal connections and the battery group 11 is connect, second battery terminal connections with it is described
The cathode of battery group 11 connects；
First feeder ear and second feeder ear are connect with the DC bus side of the motor driven systems 15.
In the embodiment of the present application, as shown in Fig. 2, first DC-DC converter 13 includes: first capacitor C1, first
Inductance L1, first switch tube S1, the first sustained diode 1 and the second sustained diode 2；
The first capacitor C1 is in parallel with the battery group 11, is formed by the first parallel circuit successively with described first
Inductance L1 and first switch tube S1 series connection, the base stage of the first switch tube S1 and the PWM controller of the electric car
Connection, first sustained diode 1 is in parallel with the emitter and collector of the first switch tube S1, the first parallel circuit
It is in parallel with second sustained diode 2 after connecting with the first inductance L1；
The work of motor driven systems 15 is under regenerative braking state, and the PWM controller is to the first switch tube
S1 carries out PWM control, when first switch tube S1 conducting, system that the motor driven systems 15 pass through the DC bus feedback
Energy is the first inductance L1 charging, the first inductance L1 accumulation of energy, while charging to battery group 11, at this time by
KVL has UL=Uo-Ui, inductive current linear rise；When first switch tube S1 is disconnected, the first inductance L1 passes through described the
Two sustained diodes 2 charge to the battery group 11, have UL=-Ui at this time, the first inductance L1 electric current linearly reduces.Consider
The switching frequency allowed to the switching loss of switching tube IGBT, heat dissipation, noise reduction and general IGBT, takes f=20KHZ here.
In the embodiment of the present application, the first DC-DC converter 13 further include: second switch S2 and the second capacitor C2；Institute
The emitter and collector for stating second switch S2 is in parallel with second sustained diode 2, the base of the second switch S2
Pole is connect with the PWM controller, is formed by first parallel circuit, the first inductance L1 and the first switch tube S1
The first series circuit it is in parallel with the second capacitor C2；
As shown in figure 3, the motor driven systems 15 work drive at a constant speed or acceleration mode under, first switch tube S1 is protected
Shutdown is held, the PWM controller carries out PWM control to the second switch S2, when second switch S2 conducting, battery
Group 11 charges to the first inductance L1, the first inductance L1 accumulation of energy, and the second capacitor C2 is the motor driven by the DC bus
System 15 is powered, at this time inductive drop Ui=UL；When second switch S2 is disconnected, battery group 11 and the first inductance L1 pass through
First sustained diode 1 is that motor driven systems 15 are powered, while being charged for the second capacitor C2, is easy to get Uo=Ui by KVL at this time
+ UL, the first inductance L1 release electric energy electric current linearly reduce.The size of deferent segment voltage Uo by control switch pipe S2 PWM duty
Than determining.
In the embodiment of the present application, second DC-DC converter 14 includes third battery terminal connections, the 4th battery connects
Connect end, third feeder ear and the 4th feeder ear；
The third battery terminal connections are connect with one end of the super capacitor group 12, the 4th battery terminal connections and institute
State the other end connection of super capacitor group 12；
The third feeder ear and the 4th feeder ear are connect with the DC bus side of the motor driven systems 15.
In the embodiment of the present application, as shown in figure 4, second DC-DC converter 14 includes: third capacitor C3, second
Inductance L2, third switching tube S3, third sustained diode 3 and the 4th sustained diode 4；
The third capacitor C3 is in parallel with the super capacitor group 12, is formed by the second parallel circuit successively with described
Two inductance L2 and third switching tube S3 series connection, the base stage of the third switching tube S3 and the PWM of the electric car are controlled
Device connection, the third sustained diode 3 is in parallel with the emitter and collector of the third switching tube S3, the second electricity in parallel
Road is in parallel with the 4th sustained diode 4 after connecting with the second inductance L2；
The work of motor driven systems 15 is under regenerative braking state, and the PWM controller is to the third switching tube
S3 carries out PWM control, when third switching tube S3 conducting, system that the motor driven systems 15 pass through the DC bus feedback
Energy is that the second inductance L2 charges, the second inductance L2 accumulation of energy, while being charged to super capacitor group 12, inductance
Electric current linear rise；When third switching tube S3 is disconnected, the second inductance L2 gives institute by the 4th sustained diode 4
The charging of super capacitor group 12 is stated, the second inductance L2 electric current linearly reduces.
In the embodiment of the present application, the second DC-DC converter 14 further include: the 4th switching tube S4 and the 4th capacitor C4；Institute
The emitter and collector for stating the 4th switching tube S4 is in parallel with the 4th sustained diode 4, the base of the 4th switching tube S4
Pole is connect with the PWM controller, is formed by second parallel circuit, the second inductance L2 and the 4th switching tube S4
The second series circuit it is in parallel with the 4th capacitor C4；
As shown in figure 5, the motor driven systems 15 work drive at a constant speed or acceleration mode under, third switching tube S3 is protected
Shutdown is held, the PWM controller carries out PWM control to the 4th switching tube S4, when the 4th switching tube S4 conducting, super electricity
Appearance group 12 charges to the second inductance L2, the second inductance L2 accumulation of energy, and the 4th capacitor C4 is motor drive by the DC bus
Dynamic system 15 is powered；When the 4th switching tube S4 is disconnected, super capacitor group 12 and the second inductance L2 pass through third freewheeling diode
D3 is the power supply of motor driven systems 15, while being charged for the 4th capacitor C4, and the second inductance L2 release electric energy electric current linearly reduces.
First DC-DC converter 13 is bi-directional half bridge DC converter.
Second DC-DC converter 14 is bi-directional half bridge DC converter.
Among these, there are some clear superiorities for bi-directional half bridge DC converter: the voltage of switching tube IGBT and diode
Current stress is relatively small；A relatively small inductance is used only in circuit and carries out energy transmission；The conduction loss of component
It is smaller, effciency of energy transfer is relatively high.
Furthermore bi-directional half bridge formula DC-DC converter topology is simple, small volume, it is easy to control the features such as；Above-mentioned electronic vapour
Vehicle novel energy-storing system is not only simple in structure, and control is relatively easy, and also very accurate to the control of energy, is greatly extended
The service life of battery group improves the performances such as electric car acceleration, climbing, and helps to reduce noise, promotes passenger and relaxes
Suitable sense.
The motor driven systems 15 include: three inverters and controller, three inverters and the controller
Connection, three inverters are connected to motor.
Super capacitor in the embodiment of the present application super capacitor group is the first device for possessing high power than, lower energy ratio
Part, the temperature range that it works are -40 DEG C to 70 DEG C.It can satisfy the various environment of automobilism completely.And it compares and stores
The maximum advantage of battery is can to complete powerful charge and discharge, long service life in the short time.Therefore super capacitor group is utilized to make
Source side and DC bus side are connected using bidirectional DC-DC converter for supplementary energy, the property of driving motor not only can be improved
The stabilization of accumulator voltage can also can be kept in a certain range.It can be incited somebody to action when motor operates in the case of regenerative braking
The energy of feedback feeds back to battery group by bidirectional DC-DC converter to charge to it.However battery charged
Journey is generally slower, so super capacitor group will be used quickly to absorb feedback energy.Similarly super capacitor group should also lead to
It crosses matching bidirectional DC-DC converter to be parallel on DC bus, advantage fast using super capacitor charge rate in this way
The braking energy of recycling electric car in time provides electric car starting, acceleration and climbing institute using the big feature of discharge current
The peak power needed, it is clear that can not only complete the two-way flow of energy well using bi-directional DC-DC, and can well by
Busbar voltage maintain one it is metastable within the scope of, the drive of motor is also significantly improved while protecting battery
Dynamic performance.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
The above is only a specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and applied principle and features of novelty phase one herein
The widest scope of cause.
Claims (10)
1. a kind of electric car energy-storage system characterized by comprising battery group, super capacitor group, the first DC-DC conversion
Device, the second DC-DC converter and motor driven systems；
The battery group the first power supply circuit of formation in parallel with first DC-DC converter；The super capacitor group and institute
It states the second DC-DC converter parallel connection and forms the second power supply circuit；First power supply circuit and second power supply circuit are in parallel
It powers afterwards for the motor driven systems of electric car；
When electric car works normally, the battery group is described by the boost mode of first DC-DC converter
Motor driven systems provide energy；When motor driven systems work is under regenerative braking state, the first DC-DC turns
The decompression mode of parallel operation carries out decompression charging to the battery group.
2. electric car energy-storage system according to claim 1, which is characterized in that first DC-DC converter includes
First battery terminal connections, the second battery terminal connections, the first feeder ear and the second feeder ear；
First battery terminal connections are connect with the anode of the battery group, second battery terminal connections and the battery
The cathode connection of group；
First feeder ear and second feeder ear are connect with the DC bus side of the motor driven systems.
3. electric car energy-storage system according to claim 2, which is characterized in that first DC-DC converter includes:
First capacitor, the first inductance, first switch tube, the first freewheeling diode and the second freewheeling diode；
The first capacitor is in parallel with the battery group, be formed by the first parallel circuit successively with first inductance and institute
First switch tube series connection is stated, the base stage of the first switch tube is connect with the PWM controller of the electric car, and described first is continuous
It is in parallel with the emitter and collector of the first switch tube to flow diode, after the first parallel circuit is connected with first inductance
It is in parallel with second freewheeling diode；
Under regenerative braking state, the PWM controller carries out PWM to the first switch tube for the motor driven systems work
Control, when the first switch tube is turned on, the motor driven systems are described by the braking energy of the DC bus feedback
First induction charging, the first inductance accumulation of energy, while charging to battery group, inductive current linear rise；When first
When switching tube disconnects, first inductance gives the battery charging, the first inductance electricity by second freewheeling diode
Cleanliness reduces.
4. electric car energy-storage system according to claim 3, which is characterized in that second switch and the second capacitor；Institute
The emitter and collector for stating second switch is in parallel with second freewheeling diode, the base stage of the second switch and institute
PWM controller connection is stated, the first series connection formed by first parallel circuit, first inductance and the first switch tube
Circuit is in parallel with second capacitor；
Motor driven systems work drive at a constant speed or acceleration mode under, first switch tube is held off, the PWM control
Device to the second switch carry out PWM control, when second switch conducting when, battery group give the first induction charging, first
Inductance accumulation of energy, the second capacitor are motor driven systems power supply by the DC bus；When second switch disconnects, store
It is motor driven systems power supply that battery pack and the first inductance, which pass through the first freewheeling diode, while being the second capacitor charging,
First inductance release electric energy electric current linearly reduces.
5. electric car energy-storage system according to claim 1, which is characterized in that second DC-DC converter includes
Third battery terminal connections, the 4th battery terminal connections, third feeder ear and the 4th feeder ear；
The third battery terminal connections are connect with one end of the super capacitor group, the 4th battery terminal connections with it is described super
The other end of capacitance group connects；
The third feeder ear and the 4th feeder ear are connect with the DC bus side of the motor driven systems.
6. electric car energy-storage system according to claim 5, which is characterized in that second DC-DC converter includes:
Third capacitor, the second inductance, third switching tube, third freewheeling diode and the 4th freewheeling diode；
The third capacitor is in parallel with the super capacitor group, be formed by the second parallel circuit successively with second inductance and
The third switching tube series connection, the base stage of the third switching tube are connect with the PWM controller of the electric car, the third
Freewheeling diode is in parallel with the emitter and collector of the third switching tube, and the second parallel circuit is connected with second inductance
It is in parallel with the 4th freewheeling diode afterwards；
Under regenerative braking state, the PWM controller carries out PWM to the third switching tube for the motor driven systems work
Control, when the conducting of third switching tube, the motor driven systems are described by the braking energy of the DC bus feedback
Second induction charging, the second inductance accumulation of energy, while charging to super capacitor group, inductive current linear rise；When
When three switching tubes disconnect, second inductance is charged by the 4th freewheeling diode to the super capacitor group, the second electricity
Electrification cleanliness reduces.
7. electric car energy-storage system according to claim 6, which is characterized in that second DC-DC converter is also wrapped
It includes: the 4th switching tube and the 4th capacitor；The emitter and collector and the 4th freewheeling diode of 4th switching tube are simultaneously
Connection, the base stage of the 4th switching tube connect with the PWM controller, by second parallel circuit, second inductance and
The second series circuit that 4th switching tube is formed is in parallel with the 4th capacitor；
Motor driven systems work drive at a constant speed or acceleration mode under, third switching tube is held off, the PWM control
Device carries out PWM control to the 4th switching tube, and when the conducting of the 4th switching tube, super capacitor group gives the second induction charging, the
Two inductance accumulation of energys, the 4th capacitor are motor driven systems power supply by the DC bus；When the 4th switching tube disconnects,
It is motor driven systems power supply that super capacitor group and the second inductance, which pass through third freewheeling diode, while being filled for the 4th capacitor
Electricity, the second inductance release electric energy electric current linearly reduce.
8. electric car energy-storage system according to claim 1, which is characterized in that first DC-DC converter is double
To Half-bridge DC converter.
9. electric car energy-storage system according to claim 1, which is characterized in that second DC-DC converter is double
To Half-bridge DC converter.
10. electric car energy-storage system according to claim 1, which is characterized in that the motor driven systems include: three
Item inverter and controller, three inverters are connect with the controller.
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| CN201811480871.2A CN109591627A (en) | 2018-12-05 | 2018-12-05 | Energy storage system of electric automobile |
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| CN201811480871.2A CN109591627A (en) | 2018-12-05 | 2018-12-05 | Energy storage system of electric automobile |
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| CN115241953A (en) * | 2022-08-12 | 2022-10-25 | 肇庆小鹏汽车有限公司 | Battery conversion circuit, method and vehicle |
| CN115476703A (en) * | 2022-09-23 | 2022-12-16 | 首凯汽车零部件（江苏）有限公司 | Composite power supply system suitable for electric vehicle power system |
| CN116853072A (en) * | 2023-06-15 | 2023-10-10 | 浙江华宇钠电新能源科技有限公司 | Voltage follow-up control method and control system for sodium ion battery |
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