CN105857109B - A kind of SCM Based electric car power supply management system - Google Patents

A kind of SCM Based electric car power supply management system Download PDF

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Publication number
CN105857109B
CN105857109B CN201610395013.2A CN201610395013A CN105857109B CN 105857109 B CN105857109 B CN 105857109B CN 201610395013 A CN201610395013 A CN 201610395013A CN 105857109 B CN105857109 B CN 105857109B
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China
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cell
circuit
battery
soc
acquisition
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CN201610395013.2A
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Chinese (zh)
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CN105857109A (en
Inventor
王媛媛
陈朝朋
袁成浩
张宗华
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河北工业大学
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

Abstract

The present invention relates to a kind of SCM Based electric car power supply management system; it is characterized in that the power-supply management system includes single-chip microcomputer, data acquisition module, charge-discharge circuit, battery module, touch-screen and protection circuit; the data acquisition module includes current acquisition part, voltage acquisition part and temperature acquisition part, and the battery module includes battery circuit and isolating amplifier circuit in groups;The single-chip microcomputer is bi-directionally connected with touch-screen, current acquisition part, voltage acquisition part and temperature acquisition part simultaneously; the output end of single-chip microcomputer is connected with the input of protection circuit and charge-discharge circuit; the one end of the protection circuit and the output end of charge-discharge circuit respectively with battery circuit in groups is connected, and the other end of battery circuit in groups is connected with the input of current acquisition part, voltage acquisition part and temperature acquisition part simultaneously by isolating amplifier circuit.

Description

A kind of SCM Based electric car power supply management system
Technical field
It is special the present invention relates to the power-supply management system technical field of the lithium ion power storage battery group applied to electric automobile It is not related to one kind and is based on monolithic processor controlled electric car power supply management system.
Background technology
Electric car power supply management system is the key component of electric automobile safety traffic, and major function is to electrokinetic cell Monitoring, appraisal and the management of group running status, avoid the occurrence of individual monomers battery overshoot, cross the phenomenon put with premature deterioration, carry The utilization rate of high electrokinetic cell, extend the cycle life of battery pack, so as to improve the course continuation mileage of electric automobile.It is well known that The cycle life of battery pack is often below the cycle life of cell, and main cause is the effective power supply of battery pack neither one Management system, so, the service efficiency and cycle life of battery pack depend on power-supply management system.
Power source of the batteries (vehicle mounted dynamic battery group or battery pack) as electric automobile, all it is by many monomers electricity Pond (battery unit) is in series, and the performance and quality of every piece of cell directly influence the dynamic property of electric automobile, reliable Property and economy.Existing power-supply management system also significant limitation be present, it is necessary to which improve and perfect, electric except needing raising The versatility of management system design, i.e., the accuracy estimated suitable for multiple batteries and polytype battery, dump energy, It is outer in terms of security, it is also necessary in terms of charging, to turn to active equalization charging from power consumption equilibrium, it is often more important that research and development are a kind of suitable High-precision management system for different duty requirements.
Such as document《Prospect of EVS Powered with Batteries charge state estimation method Review Study》Described in summarize it is conventional Power battery charged state evaluation method, wherein artificial neural network, fuzzy logic scheduling algorithm due to computationally intensive, it is necessary to The cost of constructing system, virtually considerably increase the cost of whole system;For the side such as single current integration, open-circuit voltage Method measurement is simple, but measurement accuracy is difficult to ensure that;Although system filter algorithm is used for battery dump energy, estimation is accurate, It is to need also exist for suitable circuit model, and arithmetic speed is slow.Therefore develop that a set of estimation is accurate and lower-cost single-chip microcomputer Control system is very important.
Berlin, Germany university have developed in the world the power-supply management system that Technical comparing is advanced, function is more perfect, realization pair The unified management of multiple battery modules, but such electric car power supply management system can only be carried out to the battery pack of one group of series connection Power management, it is impossible to be flexibly applied to the electric automobile power supply system of multiple battery series-parallel system, so, application by Limitation.Such as described in the B of patent of invention CN 103496328, using controllers of the PLC as power-supply management system, system Occupancy volume it is big, therefore limit the use environment of power-supply management system, and by PLC technology to SOC (remaining battery electricity Amount) carry out greatly increasing the cost of system in estimation process, and because the attachment structure of battery pack is all fixed, estimate Calculating result can not accurately be reacted in the practical working situation of system, therefore can not be according to the needs of system during use It is adjusted, hinders the further use of battery and electric automobile.
The content of the invention
It is an object of the invention to provide a kind of SCM Based electric car power supply management system.The power management system A kind of simple and reliable SOC estimating algorithms are applied on the premise of using single-chip microcomputer as control core for system and the system can fit The demand under electric automobile difference operating mode is answered, the burst mode of battery pack can flexibly switch.
To reach above-mentioned purpose, present invention employs following technical scheme:
A kind of SCM Based electric car power supply management system, it is characterised in that the power-supply management system includes monolithic Machine, data acquisition module, charge-discharge circuit, battery module, touch-screen and protection circuit, the data acquisition module include electricity Collecting part, voltage acquisition part and temperature acquisition part are flowed, the battery module includes battery, and circuit and isolation are put in groups Big circuit;The single-chip microcomputer simultaneously with touch-screen, current acquisition part, the two-way company in voltage acquisition part and temperature acquisition part Connect, the output end of single-chip microcomputer is connected with the input of protection circuit and charge-discharge circuit, the protection circuit and charge-discharge circuit One end respectively with battery circuit in groups of output end be connected, the other end of battery circuit in groups by isolating amplifier circuit simultaneously It is connected with the input of current acquisition part, voltage acquisition part and temperature acquisition part;There are SOC estimating algorithms in single-chip microcomputer And fault diagnostic program;
The battery in groups circuit circuit form be:Each cell is sequentially connected in series, and in each two cell Between connect a relay, the positive pole and negative pole of each cell draw wiring, the extraction wiring point of two positive poles It is not sequentially connected two-by-two by a relay, the extraction wiring of two negative poles is connected successively two-by-two by a relay respectively Connect.
Compared with prior art, beneficial effects of the present invention are embodied in the following aspects:
(1) present invention will come on single chip application to power-supply management system, abandon the past with computer or other controls Complicated algorithm of the device as control core, the cost of system is greatly reduced on the basis of sophisticated systems function and is taken empty Between, using single-chip microcomputer as control core, the arithmetic speed of power-supply management system can be significantly improved with reference to SOC algorithms, and It more can easily be transplanted in other occasions and use for the system of core technology relative to other controllers.
(2) it is determined that after battery allowance estimation, even if having an accurate estimated value but using mould to battery series-parallel connection Formula can not change, and use that can also be to battery has damage, and the present invention uses relay between cell, passes through corresponding relay Device controls the connection in series-parallel relation of cell, and a kind of new battery is proposed into prescription for the different working condition of electric automobile Formula, different according to environmental demand, the cell in battery pack can flexibly switch between a variety of connected modes, can make electricity Electrical automobile possesses stronger ability on more road conditions are adapted to, and can prevent battery from excessively making using increase battery With the life-span, the value with good practice and popularization.
(3) in the power-supply management system for single-chip microcomputer, prior art is estimated in SOC estimation process only with single Calculation method greatly reduces the reliability of data, and the application has abandoned the past with single method to carry out signal acquisition, passed through In the calculating process of accurate voltage and current factor, filtering process is carried out before signal is inputted into single-chip microcomputer, in this base Considerably increased on plinth using open-circuit voltage during two methods of ampere integration are combined and calculate SOC more than system battery Measure the accuracy and reliability of estimation.
Brief description of the drawings
Fig. 1 is a kind of SCM Based structured flowchart of embodiment of electric car power supply management system of the present invention;
Fig. 2 is a kind of SCM Based battery of embodiment of electric car power supply management system of present invention circuit in groups 401 circuit connection diagram;
In figure, 1 single-chip microcomputer, 2 data acquisition modules, 3 charge-discharge circuits, 4 battery modules, 5 touch-screens, 6 are protected Protection circuit, 201 current acquisition parts, 202 voltage acquisition parts, 203 temperature acquisition parts, 401 batteries in groups circuit, 402 isolating amplifier circuits.
Embodiment
The present invention is elaborated with reference to embodiment and accompanying drawing, but not in this, as to the application claim The restriction of protection domain.
The SCM Based electric car power supply management system (abbreviation power-supply management system, referring to Fig. 1-Fig. 2) of the present invention Including single-chip microcomputer 1, data acquisition module 2, charge-discharge circuit 3, battery module 4, touch-screen 5 and protection circuit 6, the data Acquisition module 2 includes current acquisition part 201, voltage acquisition part 202 and temperature acquisition part 203, the battery module 4 Including battery circuit 401 and isolating amplifier circuit 402 in groups;The single-chip microcomputer 1 simultaneously with touch-screen 5, current acquisition part 201st, voltage acquisition part 202 and temperature acquisition part 203 are bi-directionally connected, output end and protection circuit 6 and the charge and discharge of single-chip microcomputer 1 The input connection of circuit 3, the output end of the protection circuit 6 and charge-discharge circuit 3 respectively with battery circuit 401 in groups One end connect, battery in groups circuit 401 the other end by isolating amplifier circuit 402 simultaneously with current acquisition part 201, voltage Collecting part 202 connects with the input of temperature acquisition part 203;There are SOC estimating algorithms and fault diagnosis journey in single-chip microcomputer 1 Sequence;
The circuit of circuit 401 forms and (referring to Fig. 2) is the battery in groups:Each cell is sequentially connected in series, and every Connected between two cells a relay, the positive pole and negative pole of each cell draw wiring, two positive poles Extraction wiring be sequentially connected two-by-two by a relay respectively, the extraction wiring of two negative poles passes through a relay respectively It is sequentially connected two-by-two.I.e. as shown in Fig. 2 cell B1、B2、B3、…、Bn-1、Bn(following n≤2, and n is integer) go here and there successively Connection, in cell B1Negative pole and cell B2Positive pole between SRE K2, in cell B2Negative pole and list Body battery B3Positive pole between SRE K5 ..., in cell Bn-1Negative pole and cell BnPositive pole between go here and there Join relay K3n-4;Cell B1、B2、B3、…、Bn-1、BnPositive pole and negative pole draw wiring, cell B1Positive pole Draw wiring and cell B2Positive pole draw wiring between connect a relay K1, cell B2Positive pole draw connect Line and cell B3Positive pole draw wiring between connect a relay K4 ..., cell Bn-1Positive pole draw wiring With cell BnPositive pole draw wiring between connect a relay K3n-5;Cell B1Negative pole draw wiring and list Body battery B2Negative pole draw wiring between connect a relay K3, cell B2Negative pole draw wiring and cell B3Negative pole draw wiring between connect a relay K6 ..., cell Bn-1Negative pole draw wiring and cell Bn Negative pole draw wiring between connect a relay K3n-3;This circuit can exists for each cell of free switching Connection in series-parallel relation in circuit, it is possible to achieve the rapid translating of multiple battery burst mode, circuit design is simple, without complicated member The use of device, reduce the cost of hardware circuit, and handoff procedure can be achieved by single-chip microcomputer control, it is easily operated.
Further characteristic of the invention is that the current acquisition part 201 uses Hall sensor, in each monomer electricity The negative pole in pond all connects a Hall sensor, and the temperature acquisition part 203 uses DS18B20 digital temperature detection chips, Temperature acquisition is partially installed on the outside of each cell.
The charge-discharge circuit 3, which is used to connect or disconnect, is charged and discharged loop, power-supply management system is normally transported OK.Power-supply management system judges to electric automobile running status, after determining status, control loop corresponding to connection; When in running, detecting that cell is in the hole, then charge and discharge control loop can be cut off, ensure power management system The security of system.
The touch-screen 5, user can get information about the real-time status of battery pack impulse electricity by touch screen interface, That is people and the channel of equipment " communication ".The touch-screen chooses the screen of MCGS types, and passes through RS232 and microcontroller communication. Single-chip microcomputer is connected with touch-screen, realizes the function of man-machine interaction, and touch-screen can also be set in addition to possessing information display function The load button of single-chip microcomputer, hardware circuit is reduced, reduce system energy consumption, meet the design principle of low-power consumption.
The data acquisition module 2 is used to monitor battery state, gathers related data information, the dependency number of collection in real time According to including voltage, electric current and temperature, this is the basic function of power-supply management system.Wherein voltage acquisition part 202 is power supply pipe The important step of reason system, voltage determine the current state of battery, i.e., the terminal voltage of battery, which is used as, judges whether battery overcharges Cross the foundation put.Meanwhile voltage data is the foundation of SOC preresearch estimates in SOC estimating algorithms.Current data is as battery charge and discharge The foundation of excessively stream in electric process, it is the input data of protection circuit, while is also the Main Basiss of SOC estimating algorithms.Voltage and Whether temperature is in a safe condition mainly for detection of battery, the key data source that electric current is estimated as battery dump energy, And the main Processing Algorithm using amplitude limit recurrence average filtering algorithm as current signal.
The fault diagnostic program and protection circuit 6 are primarily to ensure the safe operation of power-supply management system.Phosphoric acid Lithium iron battery is in the condition of high temperature and easily exploded, and can not be run during low temperature, while over-charging of battery or the longevity for crossing battery of being rivals in a contest Life has a great influence, so to avoid the occurrence of the above situation, system must be provided with Fault diagnosing and protecting function.Power supply pipe of the present invention Reason system failure that may be present is excessively stream, overcharges, put excessively, high temperature, low temperature, and power-supply management system is classified failure, side Just fault type is distinguished, while is also provided with prompt messages, for reminding the presence of user malfunction.Work as power-supply management system During failure, judge it is any failure first, after determining fault type, starting protection circuit, if when high temperature failure Then need the radiating circuit in starting protection circuit.
SOC (battery dump energy) estimating algorithm is one critical function of power-supply management system, with data acquisition module Block 2 obtains the dump energy of battery pack, touch-screen is shown in by the form of percentage as input.Use and open in the application Road voltage method and ampere integration method, which combine, carries out SOC estimations, and the initial quantity of electricity and monomer of cell are calculated by open circuit voltage method Battery standing for a period of time after electricity, it is then, finally right by the disengaging electric quantity of single batteries in ampere integration method calculating process SOC estimation results are corrected.
Power-supply management system of the present invention is further characterized by comprising the concrete steps that for the SOC estimating algorithms:
1) open-circuit voltage of cell in the initial capacity measurement battery module of cell is calculated, utilizes open circuit electricity Pressure calculates the initial capacity of the initial SOC value, i.e. cell of cell;
2) the basic SOC value for calculating each cell utilizes ampere integration method, calculates disengaging monomer in the unit interval The process electricity of battery, the initial capacity of the cell obtained with reference to step 1) constantly update monomer by SOC estimation equations The remaining battery power of battery, obtain the basic SOC value of each cell;
3) the basic SOC value for each cell that the accurate SOC value of each cell of calculating obtains to step 2) is entered Row SOC is corrected, and the SOC corrects the correction for including discharge and recharge rate, temperature and compensation of ageing, each cell obtained after correction Accurate SOC value;
4) the accurate SOC value for each cell that the SOC estimations of battery pack obtain step 3) carries out contrast screening, looks for Go out residual electric quantity of the accurate SOC value of minimum as whole battery pack, i.e., the SOC value of whole battery pack, realize to battery pack SOC estimation.
The operation principle and process of power-supply management system of the present invention be:Voltage acquisition part 202, current acquisition part 201 Gathered respectively by isolating amplifier circuit with temperature acquisition part 203 battery in groups the electric current of each cell in circuit 401, Voltage and temperature information, single-chip microcomputer 1 calculates the dump energy of battery pack by SOC estimating algorithms, and is shown by touch-screen 5 Go out the running status of battery and electric automobile, the different operating shape of electric automobile is may determine that by the working condition of battery Condition, if electric current, voltage or temperature occur it is abnormal when if need to judge starting protection circuit by fault diagnostic program, To battery, circuit is protected in groups.It can be drawn after being judged by SOC estimating algorithms to the operation conditions of electric automobile Electric automobile needs to be operated in three different working conditions, and controlling charge-discharge circuit by single-chip microcomputer, circuit is more in groups to battery Change the purpose that burst mode switching reaches matching electric automobile working condition.
Battery module 4 can adapt to need supply voltage and the different of electric current under electric automobile difference operating mode in the present invention Ask, battery pack flexibly switches between several different burst modes, avoids battery pack from crossing and puts, and is advantageous to the battery cyclic life-span. Switching between different working modes can realize that relay is controlled by single-chip microcomputer by corresponding relay, first single-chip microcomputer Instruction is received, judges which kind of motion state electric automobile is in, judges afterwards, relay corresponding to control, by battery pack It is switched under correct pattern.Electric automobile is divided into three working stages by the application, that is, process of giving it the gun, is at the uniform velocity travelled Process, braking or charging process, charged due to braking procedure and to battery pack, so braking procedure and battery pack are charged Process is classified as a kind of working stage.Electric automobile during traveling is different to the demand of power supply in the different stages, it is possible to achieve Duo Zhong electricity The combining form in pond, the present invention will be divided into three kinds of mode of operations corresponding to battery pack.Pattern one:Braking and charging process;Pattern Two:Average rate travels process;Pattern three:Give it the gun process.It is corresponding to switch battery according to being actually needed for each mode of operation Circuit in groups.
Switching of the battery pack between three kinds of mode of operations is to realize own by monolithic processor controlled corresponding relay Relay be normally opened, reduce the extra kwh loss of power-supply management system,
The cell B in battery in groups circuit 4011、B2、B3、…、Bn-1、BnAnnexation between relay is such as Shown in Fig. 2, a relay i.e. K2, K5.. ..., K3n-4 is connected between both positive and negative polarity when each two adjacent single cells are connected, two Connect upper relay K1, K4, K7.. ... K3n-5 between the positive pole of neighboring unit cell, the negative poles of two neighboring unit cells it Between connect upper relay K3, K6.. ..., K3n-3.Change Bn-1And BnBetween connection in series-parallel relation measure:When the adjacent list of each two Body battery Bn-1、BnNeed then to connect K3n-4 when series connection, disconnect K3n-5 and K3n-3;When each two neighboring unit cell needs K3n-4 is then disconnected when being connected in parallel, connects K3n-5 and K3n-3;The string of neighboring unit cell can be realized by above-mentioned measure Parallel connectivity, such as change B1And B2Between connection in series-parallel relation only n=2 need to be made to implement by above-mentioned measure, class successively Push away.
Pattern one, braking and charging process, battery pack be in charging process, selection charged in parallel pattern, institute under the pattern So that in pattern, once, battery burst mode is parallel connection, what the equivalent circuit was obtained by switching circuit, concrete methods of realizing:Monolithic The relay drawn in wiring of machine control positive pole, i.e. K1, K4, K7.. ..., K3n-5 close, between each two cell The relay of series connection, i.e. K2, K5.. ..., K3n-4 disconnect, the relay drawn in wiring of negative pole, i.e. K3, K6.. ..., K3n-3 Closure, that realizes all cells is connected in parallel charge mode.
Pattern two, process is at the uniform velocity travelled, battery pack is in discharge process during at the uniform velocity travelling, and motor will to electric current Ask relatively less, so under pattern two, battery burst mode is series connection.Concrete methods of realizing:Single-chip microcomputer control K1, K4, K7.. ... K3n-5 disconnects, and K2, K5.. ... K3n-4 closures, K3, K6.. ... K3n-3 disconnect, and realize all cell B1、B2、 B3、…、Bn-1、BnBe connected in series charge mode.
Pattern three, accelerator, process of giving it the gun is relative at the uniform velocity process, and motor is big to current needs, so in electricity Chi Zuzhong increases output current, it is necessary to there is the presence of parallel form, is gone here and there after power-supply management system selection is first in parallel in the present embodiment The burst mode of connection.Concrete methods of realizing:Single-chip microcomputer control relay K1, K4 closes, relay K3, K6 closure, relay K2, K5 disconnects, and relay K7 disconnects, and relay K8 closures, relay K9 disconnects, relay K10, K13 closure, relay K12, K15 Closure, relay K11, K14 disconnect, and by that analogy, realize every three cell parallel connections, parallel connections ... pattern in parallel, then They are together in series again and realizes accelerator.Power-supply management system of the present invention can select using several monomers electricity as needed Pond form in parallel, is only illustrated by taking three cell parallel connections as an example herein.
Embodiment 1
The SCM Based electric car power supply management system of the present embodiment includes single-chip microcomputer 1, data acquisition module 2, filled Discharge circuit 3, battery module 4, touch-screen 5 and protection circuit 6, the data acquisition module 2 include current acquisition part 201st, voltage acquisition part 202 and temperature acquisition part 203, the battery module 4 include battery circuit 401 and isolation in groups Amplifying circuit 402;The single-chip microcomputer 1 is adopted with touch-screen 5, current acquisition part 201, voltage acquisition part 202 and temperature simultaneously Collection part 203 is bi-directionally connected, and the output end of single-chip microcomputer 1 is connected with the input of protection circuit 6 and charge-discharge circuit 3, the guarantor The one end of the output end of protection circuit 6 and charge-discharge circuit 3 respectively with battery circuit 401 in groups is connected, battery circuit 401 in groups The other end by isolating amplifier circuit 402 simultaneously with current acquisition part 201, voltage acquisition part 202 and temperature acquisition part 203 input connection;There are SOC estimating algorithms and fault diagnostic program in single-chip microcomputer 1;
The battery in groups circuit 401 circuit form be:Each cell is sequentially connected in series, and in each two monomer electricity Connected between pond a relay, the positive pole and negative pole of each cell draw wiring, the extraction wiring of two positive poles It is sequentially connected two-by-two by a relay respectively, the extraction wiring of two negative poles is connected successively two-by-two by a relay respectively Connect.
The quantity of cell is 8 in the present embodiment, i.e. n=8.
Voltage acquisition is based partially on relay and shared A/D acquisition mode in turn, is realized by switching relay to difference Cell both end voltage detects.The detection pattern that port is detected using two A/D is arranged to difference modes, all cells Shared A/D ports, monomer battery voltage scope is within A/D detection ranges, it is not necessary to sets divider resistance, avoids partial pressure electricity The energy loss that stopband comes.All relays in circuit are using normally opened in groups for battery, during without voltage acquisition, at relay Electricity is unbalanced between off-state, the cell that will not be caused extra electric quantity loss and bring, and ensure that detection essence Degree.
Current acquisition is based partially on the current detecting of Closed Loop Hall, and Hall sensor can turn the electric current of input Voltage is changed to, as output.The each cell of battery pack is required for connecing negative terminal of the Hall sensor in cell, suddenly That sensor internal integrated amplifier, so power consumption component need not be added in circuit when detecting electric current using this scheme, most Avoid energy loss to limits.It is charged and discharged by the sense of current of Hall sensor on the contrary, what two processes obtained Magnitude of voltage has on the occasion of also there is negative value, because single ended input, detection voltage range is 0-2.4V, in order to detect charging and can inspection Measuring electric process electric current by A/D, it is necessary to be arranged to difference modes.
The temperature acquisition part 203 uses DS18B20 digital temperature detection chips, and temperature acquisition is partially installed on each The outside of cell.
The specific implementation process of SOC estimating algorithms is as follows in the present embodiment:
1) the open-circuit voltage Uoc of cell in the initial capacity measurement battery module of cell is calculated, using opening Road voltage Uoc calculates the initial capacity of the initial SOC value, i.e. cell of cell by following formula;Cell open circuit electricity Linear functional relation be present between pressure and SOC value, i.e.,
Uoc=353.707863121 × (SOC)7-1275.156930924×(SOC)6+1849.583342784
×(SOC)5-1380.893816246×(SOC)4+563.780422778×(SOC)3
-123.680112549×(SOC)2+ 13.53363993 × (SOC)+2.669179058,
Cell initial SOC value is calculated using above-mentioned formula, then draws the initial capacity Q of cell3
2) the basic SOC value for calculating each cell utilizes ampere integration method, calculates disengaging monomer in the unit interval The process electricity Q of battery4, i.e., calculated by following formula,
, the initial capacity Q of the cell obtained with reference to step 1)3Cell is constantly updated by SOC estimation equations Remaining battery power, obtain the basic SOC value of each cell, the SOC estimation equations are
SOC=(Q3-Q4)/Q2× 100%,
Wherein Q2It is the reference capacity of cell;
3) the basic SOC value for each cell that the accurate SOC value of each cell of calculating obtains to step 2) is entered Row SOC is corrected, and the SOC corrects the correction for including discharge and recharge rate, temperature and compensation of ageing, each cell obtained after correction Accurate SOC value;
4) the accurate SOC value for each cell that the SOC estimations of battery pack obtain step 3) carries out contrast screening, looks for Go out residual electric quantity of the accurate SOC value of minimum as whole battery pack, i.e., the SOC value of whole battery pack, realize to battery pack SOC estimation.
The present invention does not address part and is applied to prior art.

Claims (3)

1. a kind of SCM Based electric car power supply management system, it is characterised in that the power-supply management system includes monolithic Machine, data acquisition module, charge-discharge circuit, battery module, touch-screen and protection circuit, the data acquisition module include electricity Collecting part, voltage acquisition part and temperature acquisition part are flowed, the battery module includes battery, and circuit and isolation are put in groups Big circuit;The single-chip microcomputer simultaneously with touch-screen, current acquisition part, the two-way company in voltage acquisition part and temperature acquisition part Connect, the output end of single-chip microcomputer is connected with the input of protection circuit and charge-discharge circuit, the protection circuit and charge-discharge circuit One end respectively with battery circuit in groups of output end be connected, the other end of battery circuit in groups by isolating amplifier circuit simultaneously It is connected with the input of current acquisition part, voltage acquisition part and temperature acquisition part;There are SOC estimating algorithms in single-chip microcomputer And fault diagnostic program;
The battery in groups circuit circuit form be:Each cell is sequentially connected in series, and between each two cell One relay of series connection, the positive pole and negative pole of each cell draw wiring, and the extraction wiring of two positive poles is led to respectively Cross a relay to be sequentially connected two-by-two, the extraction wiring of two negative poles is sequentially connected two-by-two by a relay respectively.
2. SCM Based electric car power supply management system according to claim 1, it is characterised in that the SOC estimates Calculate comprising the concrete steps that for algorithm:
1) open-circuit voltage of cell in the initial capacity measurement battery module of cell is calculated, utilizes open circuit voltage meter Calculate the initial capacity of the initial SOC value, i.e. cell of cell;
2) the basic SOC value for calculating each cell utilizes ampere integration method, calculates disengaging cell in the unit interval Process electricity, the initial capacity of the cell obtained with reference to step 1) passes through SOC estimation equations and constantly updates cell Remaining battery power, obtain the basic SOC value of each cell;
3) the basic SOC value for each cell that the accurate SOC value of each cell of calculating obtains to step 2) carries out SOC Correction, SOC corrections include correction, the correction of temperature-compensating and the correction of compensation of ageing of discharge and recharge rate compensation, after correction The accurate SOC value of each cell arrived;
4) the accurate SOC value for each cell that the SOC estimations of battery pack obtain step 3) carries out contrast screening, finds out most Residual electric quantity of the small accurate SOC value as whole battery pack, i.e., the SOC value of whole battery pack, realize the SOC to battery pack Estimation.
3. SCM Based electric car power supply management system according to claim 1 or 2, it is characterised in that the electricity Stream collecting part uses Hall sensor, and the temperature acquisition part uses DS18B20 digital temperature detection chips.
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