CN106026289A - Lithium iron battery large-current equalization method based on DSP control - Google Patents
Lithium iron battery large-current equalization method based on DSP control Download PDFInfo
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- CN106026289A CN106026289A CN201610565976.2A CN201610565976A CN106026289A CN 106026289 A CN106026289 A CN 106026289A CN 201610565976 A CN201610565976 A CN 201610565976A CN 106026289 A CN106026289 A CN 106026289A
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- lithium iron
- iron battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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Abstract
The invention discloses a lithium iron battery large-current equalization method based on DSP control. A lithium iron battery control system is set, which comprises at least two series-connected lithium iron batteries, the same number of first contactors and second contactors as the lithium iron batteries, a large-current discharge resistor, a lithium iron battery voltage detection module, a DSP controller, and a protection device. The DSP controller acquires the voltage of each lithium iron battery through the lithium iron battery voltage detection module. When the degree of equalization between the lithium iron batteries is greater than a set threshold, the lithium iron battery with the highest voltage is discharged by the large-current discharge resistor according to a set time. A DSP is used as a main equalization controller, which improves the control speed and stability. A contactor matrix is adopted to discharge the lithium iron batteries at large current, so the reliability of equalization is improved, and large-current discharge is realized. The method is simple to operate, safe and reliable, has a good equalization effect.
Description
Technical field
The invention belongs to the balancing technique field of lithium battery group, particularly to a kind of lithium iron battery big current balance method controlled based on DSP.
Background technology
The development of fuel-engined vehicle causes the huge consumption of petroleum resources, the continuous intensification of global energy crisis, exacerbates the harm of greenhouse effect and atmospheric pollution simultaneously.Most countries, government and Automobile Enterprises are all it is well recognized that energy-saving and emission-reduction are the developing direction of future automobile industry in the world, and Development of EV will be the optimum method solving this difficult point.It is low that electric automobile has noise, emission-free discharge, environmental friendliness, and the thermal efficiency is high, discharges low, and recoverable improves the advantages such as energy resource structure.Each automobile production enterprise the most actively researches and develops electric automobile, and Chinese Government is also actively promoting electric automobile.Electric automobile can be roughly divided into pure electric automobile, hybrid-electric car and FC-EV according to power source.These electric automobiles typically can configure battery as energy-storage travelling wave tube, particularly in pure electric automobile extensively application multi-string battery as power source.
Lithium iron battery, is connected with other positive poles by aluminium foil using LiFePO4 as the positive level of battery, and centre is the barrier film of polymer, it separates positive pole and negative pole, lithium ion can by and electronics can not pass through, the battery cathode that the right is made up of carbon, Copper Foil be connected with the negative pole of battery.Battery is the electrolyte of battery between the upper and lower ends, and battery is closed encapsulation by metal shell.Lithium iron battery is superior due to its discharge performance, can extensively apply in dynamical system.
Owing to each monomer of lithium iron battery group is all different individuality, in production technology, the factor such as production time causes battery performance index to there is difference.Although along with the continuous progress of technology, before dispatching from the factory, the difference between lithium iron battery inside constantly reduces, but during using, faint discordance constantly can be amplified along with use condition.Such discordance is by increasing with design load deviation for the capacity causing whole group of lithium iron battery.In charging process, first the monomer that capacity is little will be filled, and cause the battery of other capacity can not obtain enough capacity；In discharge process, first the monomer that capacity is little is discharged into blanking voltage, and stopping is discharged by whole Battery pack.The existence of such problem of inconsistency, active volume and service life of causing lithium iron battery group etc., aspect was far away from cell, and increased the difficulty being managed battery and controlling.Practice have shown that, significantly reduce when the consistency problem of set of cells develops into Individual cells generation capacity, when internal resistance such as significantly improves at the situation, the performance of whole Battery pack can be at short time high progression, so that whole set of cells is scrapped.
In order to solve lithium iron battery group problem of inconsistency, there has been proposed the balancing technique of lithium iron battery.The voltage to the effect that detecting lithium iron battery group of balanced management, the parameter such as electric current, these parameters are identified, analyze battery with two side terminals, by controlling device, the monomer of energy height is discharged, make the state of each monomer reach unanimity.Can be improved the consistency problem of set of cells by effective Balance route strategy and equalizing circuit, it is possible to extend the life-span of set of cells, reduce the maintenance cost of set of cells, the electric automobile making safe and efficient intelligence use puts it over.
The most general equalization methods is that each lithium iron battery is configured a discharge resistance, by checking the voltage of each monomer, is discharged the monomer that monomer is higher by the discharge resistance of oneself correspondence.When lithium iron battery Capacity Ratio is bigger, this discharge resistance discharge current would become hard to meet the requirement of fast uniform.If discharge resistance power corresponding for each lithium iron battery is become big, its volume and heat radiation are by the face of new challenge, the method that the method for existing employing resistance equilibrium seldom has big current balance.
Summary of the invention
It is an object of the invention to provide a kind of lithium iron battery big current balance method controlled based on DSP.
Concretely comprise the following steps:
(1) a set of lithium iron battery control system is set; including lithium iron battery group, heavy-current discharge resistance, lithium iron battery voltage detection module, dsp controller and protection device; wherein lithium iron battery group includes at least two lithium iron batteries connected, all corresponding first catalyst of each lithium iron battery and second catalyst；The positive pole of lithium iron battery is connected to the first end of heavy-current discharge resistance by the first catalyst of its correspondence, and the negative pole of lithium iron battery is connected to the second end of heavy-current discharge resistance by the second catalyst of its correspondence；Lithium iron battery positive pole can be connected with lithium iron battery voltage detection module with negative pole with being energized；Dsp controller includes that CAN terminal and control terminal, CAN terminal are connected with lithium iron battery voltage detection module, and the control terminal of control terminal and the first catalyst and the second catalyst connects；When dsp controller controls the first catalyst corresponding to lithium iron battery and the conducting of the second catalyst, lithium iron battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which lithium iron battery and heavy-current discharge resistor coupled in parallel；Protection device includes that D.C. contactor and resettable fuse, D.C. contactor and resettable fuse are cascaded and is followed by the negative pole of lithium iron battery group.
Described lithium iron battery is basic lithium iron battery unit i.e. monomer lithium iron battery or the lithium iron battery brick composed in parallel by multiple basic lithium iron battery unit.
(2) the lithium iron battery control system that step (1) is arranged is run according to following steps:
a.
Dsp controller communicates with lithium iron battery voltage detection module, it is thus achieved that the voltage of each lithium iron battery.
b.
Dsp controller, according to the N number of lithium iron battery voltage obtained, finds out the lithium iron battery that magnitude of voltage is maximum, and wherein N is more than or equal to 2.
c.
Dsp controller obtains the meansigma methods of all lithium iron battery voltage.
d.
Jump into step e when the lithium iron battery voltage that magnitude of voltage is maximum is more than a setting threshold values with all lithium iron battery average voltage deviations, otherwise return to step a.
e.
DSP, by controlling the first catalyst corresponding to the maximum lithium iron battery of voltage and the second catalyst, makes lithium iron battery and the heavy-current discharge resistor coupled in parallel of magnitude of voltage maximum, and the lithium iron battery maximum to magnitude of voltage discharges.
f.
Waiting the time T set, dsp controller disconnects all contactless contactors by control terminal, and program returns step a.
(3) the big current balance of lithium iron battery that step (2) i.e. realizes controlling is completed based on DSP.
The inventive method uses a set of lithium iron battery control system, this system includes the charging and discharging balance device of lithium iron battery, so that lithium iron battery system is effectively managed in charge and discharge process and is equalized, to improve efficiency and the service life of lithium iron battery system, and reduce the maintenance cost of ferrum lithium electricity system；The present invention uses DSP as primary equalization controller, improves and controls speed and stability；The present invention uses catalyst matrix-style, it is achieved the heavy-current discharge to lithium iron battery, to improve the reliability of equilibrium, and realizes heavy-current discharge；The inventive method is simple to operate, safe and reliable, and portfolio effect is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lithium iron battery control system used in the embodiment of the present invention.
Fig. 2 is the balance control method flow chart in embodiment of the present invention charge and discharge process.
Detailed description of the invention
Embodiment:
The present invention is further described below in conjunction with the accompanying drawings.
Hereinafter describe and be used for disclosing the present invention so that those skilled in the art are capable of the present invention.Preferred embodiment in below describing is only used as citing, it may occur to persons skilled in the art that other obvious modification.The ultimate principle of the present invention defined in the following description can apply to other embodiments, deformation program, improvement project, equivalent and the other technologies scheme without departing from the spirit and scope of the present invention.
As it is shown in figure 1, a kind of lithium iron battery big current balance method controlled based on DSP, concretely comprise the following steps:
(1) a set of lithium iron battery control system is set; including lithium iron battery group, heavy-current discharge resistance R (carrying the high-power resistance of radiator), lithium iron battery voltage detection module, dsp controller and protection device; wherein lithium iron battery group includes at least two lithium iron batteries connected, all corresponding first catalyst of each lithium iron battery and second catalyst；The positive pole of lithium iron battery is connected to first end of heavy-current discharge resistance R by the first catalyst of its correspondence, and the negative pole of lithium iron battery is connected to second end of heavy-current discharge resistance R by the second catalyst of its correspondence；Lithium iron battery positive pole can be connected with lithium iron battery voltage detection module with negative pole with being energized；Dsp controller includes that CAN terminal and control terminal, CAN terminal are connected with lithium iron battery voltage detection module, and the control terminal of control terminal and the first catalyst and the second catalyst connects；When dsp controller controls the first catalyst corresponding to lithium iron battery and the conducting of the second catalyst, lithium iron battery is in parallel with heavy-current discharge resistance R, and synchronization only one of which lithium iron battery is in parallel with heavy-current discharge resistance R；Protection device includes that D.C. contactor and resettable fuse, D.C. contactor and resettable fuse are cascaded and is followed by the negative pole of lithium iron battery group.
Described lithium iron battery is basic lithium iron battery unit i.e. monomer lithium iron battery.
The negative pole of equilibrium object lithium iron battery 1 connects with the positive pole of Jun Heng object lithium iron battery 2, the negative pole of described equilibrium object lithium iron battery 2 connects with the positive pole of Jun Heng object lithium iron battery 3, it is sequentially connected in series each equilibrium object lithium iron battery, until the negative pole of equilibrium object lithium iron battery N-1 connects with the positive pole of Jun Heng object lithium iron battery N, all lithium iron batteries are sequentially connected in series lithium iron battery group, in described lithium iron battery group, the positive pole of the most described lithium iron battery group of described equilibrium object lithium iron battery 1, the negative pole that negative pole is described lithium iron battery group of described equilibrium object lithium iron battery N.
The positive pole of each described equilibrium object lithium iron battery is connected with first end of described heavy-current discharge resistance R by corresponding described first catalyst, the negative pole of each described equilibrium object lithium iron battery is connected with second end of described heavy-current discharge resistance R by corresponding described second catalyst, is connected with the control terminal of described dsp controller after the control terminal K parallel connection of described first catalyst and described second catalyst.
The D1 terminal of each described first catalyst connects with the positive pole of described equilibrium object lithium iron battery, and D2 terminal is connected with first end of described heavy-current discharge resistance R, and control terminal K and DSP control terminal is connected.
The D1 terminal of each described second catalyst connects with the negative pole of described equilibrium object lithium iron battery, and D2 terminal is connected with second end of described heavy-current discharge resistance R, and control terminal K and DSP control terminal is connected.
The connection that described lithium iron battery voltage detection module can be led to the positive pole of described lithium iron battery and negative pole, for detecting the voltage of each lithium iron battery；Linked with described dsp controller by CAN, send the voltage signal detected to dsp controller.
(2) as in figure 2 it is shown, the lithium iron battery control system that step (1) is arranged is run according to following steps:
a.
Dsp controller communicates with lithium iron battery voltage detection module, it is thus achieved that the voltage of each lithium iron battery.
b.
Dsp controller, according to the N number of lithium iron battery voltage obtained, finds out the lithium iron battery that magnitude of voltage is maximum, and wherein N is more than or equal to 2.
c.
Dsp controller obtains the meansigma methods of all lithium iron battery voltage.
d.
Jump into step e when the lithium iron battery voltage that magnitude of voltage is maximum is more than a setting threshold values with all lithium iron battery average voltage deviations, otherwise return to step a.
e.
DSP is by controlling the first catalyst corresponding to the maximum lithium iron battery of voltage and the second catalyst, and the lithium iron battery making magnitude of voltage maximum is in parallel with heavy-current discharge resistance R, and the lithium iron battery maximum to magnitude of voltage discharges.
f.
Waiting the time T set, dsp controller disconnects all contactless contactors by control terminal, and program returns step a.
(3) the big current balance of lithium iron battery that step (2) i.e. realizes controlling is completed based on DSP.
Claims (1)
1. the lithium iron battery big current balance method controlled based on DSP, it is characterised in that concretely comprise the following steps:
(1) a set of lithium iron battery control system is set; including lithium iron battery group, heavy-current discharge resistance, lithium iron battery voltage detection module, dsp controller and protection device; wherein lithium iron battery group includes at least two lithium iron batteries connected, all corresponding first catalyst of each lithium iron battery and second catalyst；The positive pole of lithium iron battery is connected to the first end of heavy-current discharge resistance by the first catalyst of its correspondence, and the negative pole of lithium iron battery is connected to the second end of heavy-current discharge resistance by the second catalyst of its correspondence；Lithium iron battery positive pole can be connected with lithium iron battery voltage detection module with negative pole with being energized；Dsp controller includes that CAN terminal and control terminal, CAN terminal are connected with lithium iron battery voltage detection module, and the control terminal of control terminal and the first catalyst and the second catalyst connects；When dsp controller controls the first catalyst corresponding to lithium iron battery and the conducting of the second catalyst, lithium iron battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which lithium iron battery and heavy-current discharge resistor coupled in parallel；Protection device includes that D.C. contactor and resettable fuse, D.C. contactor and resettable fuse are cascaded and is followed by the negative pole of lithium iron battery group；
Described lithium iron battery is basic lithium iron battery unit i.e. monomer lithium iron battery or the lithium iron battery brick composed in parallel by multiple basic lithium iron battery unit；
(2) the lithium iron battery control system that step (1) is arranged is run according to following steps:
A. dsp controller communicates with lithium iron battery voltage detection module, it is thus achieved that the voltage of each lithium iron battery；
B. dsp controller is according to the N number of lithium iron battery voltage obtained, and finds out the lithium iron battery that magnitude of voltage is maximum, and wherein N is more than or equal to 2；
C. dsp controller obtains the meansigma methods of all lithium iron battery voltage；
D. jump into step e when the lithium iron battery voltage that magnitude of voltage is maximum is more than a setting threshold values with all lithium iron battery average voltage deviations, otherwise return to step a；
E. DSP is by controlling the first catalyst corresponding to the maximum lithium iron battery of voltage and the second catalyst, makes lithium iron battery and the heavy-current discharge resistor coupled in parallel of magnitude of voltage maximum, and the lithium iron battery maximum to magnitude of voltage discharges；
F. waiting the time T of setting, dsp controller disconnects all contactless contactors by control terminal, and program returns step a；
(3) the big current balance of lithium iron battery that step (2) i.e. realizes controlling is completed based on DSP.
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| CN201610565976.2A CN106026289A (en) | 2016-07-19 | 2016-07-19 | Lithium iron battery large-current equalization method based on DSP control |
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Citations (7)
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| CN1607708A (en) * | 2003-10-13 | 2005-04-20 | 上海燃料电池汽车动力***有限公司 | Equalizing circuit for lithium ion power accumulator |
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| CN1607708A (en) * | 2003-10-13 | 2005-04-20 | 上海燃料电池汽车动力***有限公司 | Equalizing circuit for lithium ion power accumulator |
| US20070046260A1 (en) * | 2005-08-24 | 2007-03-01 | Yazaki Corporation | Apparatus for regulating state of charge in battery assembly |
| US20080036424A1 (en) * | 2006-08-11 | 2008-02-14 | Yazaki Corporation | State-of-charge adjusting apparatus |
| CN101765958A (en) * | 2007-07-26 | 2010-06-30 | 株式会社Lg化学 | Apparatus and method for balancing of battery cell's charge capacity |
| US20090115372A1 (en) * | 2007-11-01 | 2009-05-07 | Honda Motor Co., Ltd. | Discharge control system |
| CN104348234A (en) * | 2014-11-21 | 2015-02-11 | 南京国臣信息自动化技术有限公司 | Battery management system with active equalization system |
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