CN105871028A - High-current equalizing control system for LiMn2O4 batteries - Google Patents
High-current equalizing control system for LiMn2O4 batteries Download PDFInfo
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- CN105871028A CN105871028A CN201610337673.5A CN201610337673A CN105871028A CN 105871028 A CN105871028 A CN 105871028A CN 201610337673 A CN201610337673 A CN 201610337673A CN 105871028 A CN105871028 A CN 105871028A
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- lithium manganate
- manganate battery
- contactor
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- limn2o4
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a high-current equalizing control system for LiMn2O4 batteries. The high-current equalizing control system for the LiMn2O4 batteries comprises at least two LiMn2O4 batteries connected in series, first contactors, second contactors, a high-current discharge resistor, a LiMn2O4 battery voltage detection module, a single-chip microcomputer controller and a protection device, wherein the quantity of the first contactors and the quantity of the second contactors are equal to that of the LiMn2O4 batteries; the single-chip microcomputer controller acquires voltage of each LiMn2O4 battery through the LiMn2O4 battery voltage detection module, and when the equalization degree of the LiMn2O4 batteries is higher than a set threshold value, the LiMn2O4 battery with the highest voltage discharges through the high-current discharge resistor according to set time. A single-chip microcomputer is taken as a main equalization controller, and the system cost is reduced; high-current discharge of the LiMn2O4 batteries is realized in a contactor matrix manner, so that the equalization reliability is improved, high-current discharge is realized, and the system is simple to operate, safe, reliable and good in equalization effect.
Description
Technical field
The invention belongs to the balancing technique field of lithium battery group, particularly to a kind of lithium manganate battery big current balance control system.
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 effects and atmosphere 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, and these electric automobiles typically can configure battery as energy-storage travelling wave tube, particularly in pure electric automobile extensively application multi-series and parallel battery as power source.
Lithium manganate battery is with LiMn2O4As the positive level of battery, aluminium foil being connected with other positive poles, centre is the barrier film of polymer, and it separates positive pole and negative pole, but lithium ion can by and electronics can not pass through, the GND 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 manganate battery is superior due to its discharge performance, can extensively apply in dynamical system.
Owing to each monomer of lithium manganate 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 manganate battery inside constantly reduces, but during using, faint inconsistency constantly can be amplified along with use condition.Such inconsistency is by increasing with design load deviation for the capacity causing whole group of lithium manganate 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 manganate 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 battery pack 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 battery pack is scrapped.
In order to solve lithium manganate battery group problem of inconsistency, there has been proposed the balancing technique of lithium manganate battery.The voltage to the effect that detecting lithium manganate 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 battery pack by effective Balance route strategy and equalizing circuit, it is possible to extend the life-span of battery pack, reduce the maintenance cost of battery pack, the electric automobile making safe and efficient intelligence use puts it over.
The most general equalization methods is that each lithium manganate 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 manganate cell volume 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 manganate 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 manganate battery big current balance control system.
The present invention is achieved in that a kind of lithium manganate battery big current balance control system; including lithium manganate battery group, heavy-current discharge resistance, lithium manganate battery voltage detection module, singlechip controller and protection device; wherein lithium manganate battery group includes at least two lithium manganate batteries connected, all corresponding first contactor of the most each lithium manganate battery and second contactor；The positive pole of lithium manganate battery is connected to heavy-current discharge resistance the first end by the first contactor of its correspondence, and the negative pole of lithium manganate battery is connected to heavy-current discharge resistance the second end by the second contactor of its correspondence；Lithium manganate cell positive electrode can be connected with lithium manganate battery voltage detection module with negative pole with being energized；Singlechip controller includes CAN terminal and control terminal, CAN terminal is connected with lithium manganate battery voltage detection module, the control terminal of control terminal and the first contactor and the second contactor connects, when singlechip controller controls the first contactor corresponding to lithium manganate battery and the conducting of the second contactor, lithium manganate battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which lithium manganate 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 manganate battery group.
Described lithium manganate battery is basic lithium manganate battery unit i.e. monomer lithium manganate battery or the lithium manganate battery brick composed in parallel by multiple basic lithium manganate battery unit.
The lithium manganate battery big current balance control system of the present invention includes the charging and discharging balance device of lithium manganate battery, lithium manganate battery system is made effectively to be managed in charge and discharge process and equalize, to improve efficiency and the service life of lithium manganate battery system, reduce the maintenance cost of LiMn2O4 electricity system；The present invention uses single-chip microcomputer as primary equalization controller, reduces the cost of system, and uses contactor matrix-style, realize the heavy-current discharge to lithium manganate battery, to improve the reliability of equilibrium, it is achieved heavy-current discharge, native system is simple to operate, safe and reliable, and portfolio effect is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of lithium manganate battery big current balance control system in the embodiment of the present invention.
Fig. 2 is the balance control method flow chart in the embodiment of the present invention in lithium manganate battery big current balance control system charge and discharge process.
Detailed description of the invention
Embodiment:
The present invention will be 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 general 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 shown in Figure 1; a kind of lithium manganate battery big current balance control system; carry the high-power resistance of radiator including lithium manganate battery group, heavy-current discharge resistance R(), lithium manganate battery voltage detection module, singlechip controller and protection device; wherein lithium manganate battery group includes at least two lithium manganate batteries connected, all corresponding first contactor of the most each lithium manganate battery and second contactor；The positive pole of lithium manganate battery is connected to heavy-current discharge resistance the first end by the first contactor of its correspondence, and the negative pole of lithium manganate battery is connected to heavy-current discharge resistance the second end by the second contactor of its correspondence；Lithium manganate cell positive electrode can be connected with lithium manganate battery voltage detection module with negative pole with being energized；Singlechip controller includes CAN terminal and control terminal, CAN terminal is connected with lithium manganate battery voltage detection module, the control terminal of control terminal and the first contactor and the second contactor connects, when singlechip controller controls the first contactor corresponding to lithium manganate battery and the conducting of the second contactor, lithium manganate battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which lithium manganate 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 manganate battery group.
Described lithium manganate battery is basic lithium manganate battery unit i.e. monomer lithium manganate battery.
The negative pole of equilibrium object lithium manganate battery 1 connects with the positive pole of Jun Heng object lithium manganate battery 2, the negative pole of equilibrium object lithium manganate battery 2 connects with the positive pole of Jun Heng object lithium manganate battery 3, it is sequentially connected in series each equilibrium object lithium manganate battery, until the negative pole of equilibrium object lithium manganate battery N-1 connects with the positive pole of Jun Heng object lithium manganate battery N, all lithium manganate batteries are sequentially connected in series lithium manganate battery group, in lithium manganate battery group, the positive pole of the most extremely lithium manganate battery group of equilibrium object lithium manganate battery 1, the negative pole that negative pole is lithium manganate battery group of equilibrium object lithium manganate battery N.
The positive pole of each equilibrium object lithium manganate battery is connected with first end of heavy-current discharge resistance R by the first corresponding contactor, the negative pole of each equilibrium object lithium manganate battery is connected with second end of heavy-current discharge resistance R by the second corresponding contactor, is connected with the control terminal of singlechip controller after the control terminal K parallel connection of the first contactor and the second contactor.
The D1 terminal of each first contactor connects with the positive pole of Jun Heng object lithium manganate battery, and D2 terminal is connected with first end of heavy-current discharge resistance R, and control terminal K is connected with the control terminal of singlechip controller.
The D1 terminal of each second contactor connects with the negative pole of Jun Heng object lithium manganate battery, and D2 terminal is connected with second end of heavy-current discharge resistance R, and control terminal K is connected with the control terminal of singlechip controller.
Described lithium manganate battery voltage detection module can be connected with positive pole and the negative pole of lithium manganate battery with being energized, for detecting the voltage of each lithium manganate battery；It is connected with singlechip controller by CAN, sends the voltage signal detected to singlechip controller.
As in figure 2 it is shown, the lithium manganate battery big current balance control system in the present embodiment is run according to following steps:
A. singlechip controller communicates with lithium manganate battery voltage detection module, it is thus achieved that the voltage of each lithium manganate battery.
B. singlechip controller is according to the N number of lithium manganate battery voltage obtained, and finds out the lithium manganate battery that magnitude of voltage is maximum, and wherein N is more than or equal to 2.
C. singlechip controller obtains the mean value of all lithium manganate battery voltage.
D. jump into step e when the lithium manganate battery voltage that magnitude of voltage is maximum is more than a setting threshold values with all lithium manganate battery average voltage deviations, otherwise return to step a.
E. singlechip controller is in parallel with heavy-current discharge resistance R by the lithium manganate battery controlling the first contactor corresponding to the maximum lithium manganate battery of voltage and the second contactor makes magnitude of voltage maximum, discharges lithium manganate battery.
F. waiting the time T of setting, singlechip controller disconnects all contactless contactors by control terminal, and program returns step a.
Claims (1)
1. a lithium manganate battery big current balance control system; it is characterized in that this lithium manganate battery big current balance control system includes lithium manganate battery group, heavy-current discharge resistance, lithium manganate battery voltage detection module, singlechip controller and protection device; wherein lithium manganate battery group includes at least two lithium manganate batteries connected, all corresponding first contactor of the most each lithium manganate battery and second contactor；The positive pole of lithium manganate battery is connected to heavy-current discharge resistance the first end by the first contactor of its correspondence, and the negative pole of lithium manganate battery is connected to heavy-current discharge resistance the second end by the second contactor of its correspondence；Lithium manganate cell positive electrode can be connected with lithium manganate battery voltage detection module with negative pole with being energized；Singlechip controller includes CAN terminal and control terminal, CAN terminal is connected with lithium manganate battery voltage detection module, the control terminal of control terminal and the first contactor and the second contactor connects, when singlechip controller controls the first contactor corresponding to lithium manganate battery and the conducting of the second contactor, lithium manganate battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which lithium manganate 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 manganate battery group；
Described lithium manganate battery is basic lithium manganate battery unit i.e. monomer lithium manganate battery or the lithium manganate battery brick composed in parallel by multiple basic lithium manganate battery unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610337673.5A CN105871028A (en) | 2016-05-22 | 2016-05-22 | High-current equalizing control system for LiMn2O4 batteries |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610337673.5A CN105871028A (en) | 2016-05-22 | 2016-05-22 | High-current equalizing control system for LiMn2O4 batteries |
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| CN105871028A true CN105871028A (en) | 2016-08-17 |
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| CN201610337673.5A Pending CN105871028A (en) | 2016-05-22 | 2016-05-22 | High-current equalizing control system for LiMn2O4 batteries |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106025261A (en) * | 2016-07-19 | 2016-10-12 | 桂林理工大学 | High-current balanced DSP control system for lithium manganate batteries |
| CN106450524A (en) * | 2016-11-11 | 2017-02-22 | 桂林理工大学 | High current balancing ARM control system with lithium manganate batteries |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN106450524A (en) * | 2016-11-11 | 2017-02-22 | 桂林理工大学 | High current balancing ARM control system with lithium manganate batteries |
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