CN105811534A - Singlechip microcomputer control based large current balancing method of ternary lithium battery - Google Patents
Singlechip microcomputer control based large current balancing method of ternary lithium battery Download PDFInfo
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- CN105811534A CN105811534A CN201610337666.5A CN201610337666A CN105811534A CN 105811534 A CN105811534 A CN 105811534A CN 201610337666 A CN201610337666 A CN 201610337666A CN 105811534 A CN105811534 A CN 105811534A
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- lithium battery
- ternary lithium
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- voltage
- ternary
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000003054 catalyst Substances 0.000 claims description 37
- 239000000178 monomer Substances 0.000 claims description 11
- 239000011449 brick Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011159 matrix material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005183 dynamical system Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- 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
-
- H02J7/0026—
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a singlechip microcomputer control based large current balancing method of a ternary lithium battery. A ternary lithium battery system is arranged and comprises at least two ternary lithium batteries, first contactors, second contactors, a large current discharging resistor, a ternary lithium battery voltage detection module, a singlechip microcomputer controller and a protection device, wherein the at least two ternary lithium batteries are connected in series, the quantity of the first contactors and the second contactors are the same as the quantity of the ternary lithium batteries, the singlechip microcomputer controller acquires the voltage of each ternary lithium battery through the ternary lithium battery voltage detection module, and when the balance degree among the ternary lithium batteries is greater than a set threshold, the ternary lithium battery with the maximum voltage is discharged by the large current discharging resistor according to a set time. According to the method, a singlechip microcomputer is taken as a main balancing controller, and the system cost is reduced; with the adoption of a contactor matrix, large current discharging of the ternary lithium battery is achieved, the balancing reliability can be improved, and the large current discharging is achieved; and the method is simple to operate, is safe and reliability and is high in balancing effect.
Description
Technical field
The invention belongs to the balancing technique field of lithium battery group, particularly to one based on the big current balance method of monolithic processor controlled ternary lithium battery.
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 just 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 generally can configure battery as energy-storage travelling wave tube, particularly in pure electric automobile extensive use multi-string battery as power source.
Ternary lithium battery, is connected with other positive poles by aluminium foil using trielement composite material as the positive level of battery, and centre is the barrier film of polymer, it separates positive pole and negative pole, but 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.Ternary lithium battery is superior due to its discharge performance, it is possible to extensively apply in dynamical system.
Due to the individuality that each monomer of ternary lithium battery group is all different, in production technology, the factor such as production time causes that battery performance index exists difference.Although along with the continuous progress of technology, before dispatching from the factory, the difference between ternary lithium battery interior constantly reduces, but discordance faint in use procedure constantly can be amplified along with use condition.Such discordance is by increasing with design load deviation for the capacity causing whole group of ternary lithium battery.In charging process, first the monomer that capacity is little will be filled, and cause that 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 ternary lithium battery group etc., aspect was far away from cell, and increased difficulty battery being managed 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 at short time high progression so that whole set of cells is scrapped.
In order to solve ternary lithium battery group problem of inconsistency, there has been proposed the balancing technique of ternary lithium battery.The voltage to the effect that detecting ternary lithium 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.The consistency problem of set of cells can be improved 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, make the electric automobile that safe and efficient intelligence uses put it over.
Equalization methods general at present is that each ternary lithium battery is configured a discharge resistance, by checking the voltage of each monomer, the monomer that monomer is higher is discharged by the discharge resistance of oneself correspondence.When ternary lithium battery capacity is relatively larger, this discharge resistance discharge current would become hard to meet the requirement of fast uniform.If discharge resistance power corresponding for each ternary lithium 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 based on the big current balance method of monolithic processor controlled ternary lithium battery.
Concretely comprise the following steps:
(1) a set of ternary lithium battery system is set; including ternary lithium battery group, heavy-current discharge resistance, ternary lithium battery voltage detection module, singlechip controller and protection device; wherein ternary lithium battery group includes the ternary lithium battery of at least two series connection, wherein all corresponding first catalyst of each ternary lithium battery and second catalyst；The positive pole of ternary lithium battery is connected to heavy-current discharge resistance the first end by the first catalyst of its correspondence, and the negative pole of ternary lithium battery is connected to heavy-current discharge resistance the second end by the second catalyst of its correspondence；Ternary lithium battery anode can be connected with ternary lithium battery voltage detection module with negative pole with being energized；Singlechip controller includes CAN terminal and control terminal, CAN terminal is connected with ternary lithium battery voltage detection module, the control terminal of control terminal and the first catalyst and the second catalyst connects, when controlling the first catalyst corresponding to ternary lithium battery and the conducting of the second catalyst when singlechip controller, ternary lithium battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which ternary lithium battery and heavy-current discharge resistor coupled in parallel；Protection device includes D.C. contactor and resettable fuse, D.C. contactor and resettable fuse and is cascaded and is followed by the negative pole of ternary lithium battery group.
Described ternary lithium battery is basic ternary lithium cells and monomer terpoiymer lithium battery or the ternary lithium battery brick composed in parallel by multiple basic ternary lithium cells.
(2) the ternary lithium battery system that step (1) is arranged runs according to following steps:
A. singlechip controller communicates with ternary lithium battery voltage detection module, it is thus achieved that the voltage of each ternary lithium battery.
B. singlechip controller is according to the N number of ternary lithium battery voltage obtained, and finds out the ternary lithium battery that magnitude of voltage is maximum, and wherein N is be more than or equal to 2.
C. singlechip controller obtains the meansigma methods of all ternary lithium battery voltage.
D. jump into step e when the maximum ternary lithium battery voltage of magnitude of voltage and all ternary lithium battery average voltage deviations set threshold values more than one, otherwise return to step a.
E. singlechip controller is by controlling the first catalyst corresponding to the maximum ternary lithium battery of voltage and ternary lithium battery that the second catalyst makes magnitude of voltage maximum and heavy-current discharge resistor coupled in parallel, and ternary lithium battery is discharged.
F. waiting the time T of setting, singlechip controller disconnects all contactless contactors by control terminal, and program returns step a.
(3) complete step (2) namely to realize based on the monolithic processor controlled big current balance of ternary lithium battery.
The inventive method uses a set of ternary lithium battery system, this ternary lithium battery system includes the charging and discharging balance device of ternary lithium battery, ternary lithium battery system is made effectively to be managed in charge and discharge process and balanced, to improve efficiency and the service life of ternary lithium battery system, reduce the maintenance cost of ternary lithium electricity system；The present invention adopts single-chip microcomputer as primary equalization controller, reduces the cost of system, and adopts catalyst matrix-style, it is achieved the heavy-current discharge to ternary lithium 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 ternary lithium battery system that the embodiment of the present invention uses.
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:
Below in conjunction with accompanying drawing, the present invention is further described.
It is described below for disclosing the present invention so that those skilled in the art are capable of the present invention.Preferred embodiment in being described below is only used as citing, it may occur to persons skilled in the art that other apparent 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, one is based on the big current balance method of monolithic processor controlled ternary lithium battery, concretely comprise the following steps:
(1) a set of ternary lithium battery system is set; carry the high-power resistance of radiator including ternary lithium battery group, heavy-current discharge resistance R(), ternary lithium battery voltage detection module, singlechip controller and protection device; wherein ternary lithium battery group includes the ternary lithium battery of at least two series connection, wherein all corresponding first catalyst of each ternary lithium battery and second catalyst；The positive pole of ternary lithium battery is connected to heavy-current discharge resistance the first end by the first catalyst of its correspondence, and the negative pole of ternary lithium battery is connected to heavy-current discharge resistance the second end by the second catalyst of its correspondence；Ternary lithium battery anode can be connected with ternary lithium battery voltage detection module with negative pole with being energized；Singlechip controller includes CAN terminal and control terminal, CAN terminal is connected with ternary lithium battery voltage detection module, the control terminal of control terminal and the first catalyst and the second catalyst connects, when controlling the first catalyst corresponding to ternary lithium battery and the conducting of the second catalyst when singlechip controller, ternary lithium battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which ternary lithium battery and heavy-current discharge resistor coupled in parallel；Protection device includes D.C. contactor and resettable fuse, and wherein D.C. contactor and resettable fuse are cascaded and are followed by the negative pole of ternary lithium battery group.
Described ternary lithium battery is basic ternary lithium cells and monomer terpoiymer lithium battery.
The balanced negative pole of object ternary lithium battery 1 connects with the positive pole of balanced object ternary lithium battery 2, the balanced negative pole of object ternary lithium battery 2 connects with the positive pole of balanced object ternary lithium battery 3, it is sequentially connected in series each balanced object ternary lithium battery, until the balanced negative pole of object ternary lithium battery N-1 connects with the positive pole of balanced object ternary lithium battery N, all ternary lithium batteries are sequentially connected in series ternary lithium battery group, in ternary lithium battery group, the positive pole of the just extremely ternary lithium battery group of balanced object ternary lithium battery 1, the negative pole that negative pole is ternary lithium battery group of balanced object ternary lithium battery N.
The positive pole of each balanced object ternary lithium battery is connected with first end of heavy-current discharge resistance R by the first corresponding catalyst, the negative pole of each balanced object ternary lithium battery is connected with second end of heavy-current discharge resistance R by the second corresponding catalyst, is connected with the control terminal of singlechip controller after the control terminal K parallel connection of the first catalyst and the second catalyst.
The D1 terminal of each first catalyst connects with the positive pole of balanced object ternary lithium 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 catalyst connects with the negative pole of balanced object ternary lithium 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 ternary lithium battery voltage detection module can be connected with positive pole and the negative pole of ternary lithium battery with being energized, for detecting the voltage of each ternary lithium battery；It is connected with singlechip controller by CAN, sends the voltage signal detected to singlechip controller.
(2) as in figure 2 it is shown, the ternary lithium battery system that step (1) is arranged runs according to following steps:
A. singlechip controller communicates with ternary lithium battery voltage detection module, it is thus achieved that the voltage of each ternary lithium battery.
B. singlechip controller is according to the N number of ternary lithium battery voltage obtained, and finds out the ternary lithium battery that magnitude of voltage is maximum, and wherein N is be more than or equal to 2.
C. singlechip controller obtains the meansigma methods of all ternary lithium battery voltage.
D. jump into step e when the maximum ternary lithium battery voltage of magnitude of voltage and all ternary lithium battery average voltage deviations set threshold values more than one, otherwise return to step a.
E. singlechip controller is in parallel with heavy-current discharge resistance R by the ternary lithium battery controlling the first catalyst corresponding to the maximum ternary lithium battery of voltage and the second catalyst makes magnitude of voltage maximum, and ternary lithium battery is discharged.
F. waiting the time T of setting, singlechip controller disconnects all contactless contactors by control terminal, and program returns step a.
(3) complete step (2) namely to realize based on the monolithic processor controlled big current balance of ternary lithium battery.
Claims (1)
1. one kind based on the big current balance method of monolithic processor controlled ternary lithium battery, it is characterised in that concretely comprise the following steps:
(1) a set of ternary lithium battery system is set; including ternary lithium battery group, heavy-current discharge resistance, ternary lithium battery voltage detection module, singlechip controller and protection device; wherein ternary lithium battery group includes the ternary lithium battery of at least two series connection, wherein all corresponding first catalyst of each ternary lithium battery and second catalyst；The positive pole of ternary lithium battery is connected to heavy-current discharge resistance the first end by the first catalyst of its correspondence, and the negative pole of ternary lithium battery is connected to heavy-current discharge resistance the second end by the second catalyst of its correspondence；Ternary lithium battery anode can be connected with ternary lithium battery voltage detection module with negative pole with being energized；Singlechip controller includes CAN terminal and control terminal, CAN terminal is connected with ternary lithium battery voltage detection module, the control terminal of control terminal and the first catalyst and the second catalyst connects, when controlling the first catalyst corresponding to ternary lithium battery and the conducting of the second catalyst when singlechip controller, ternary lithium battery and heavy-current discharge resistor coupled in parallel, synchronization only one of which ternary lithium battery and heavy-current discharge resistor coupled in parallel；Protection device includes D.C. contactor and resettable fuse, D.C. contactor and resettable fuse and is cascaded and is followed by the negative pole of ternary lithium battery group；
Described ternary lithium battery is basic ternary lithium cells and monomer terpoiymer lithium battery or the ternary lithium battery brick composed in parallel by multiple basic ternary lithium cells；
(2) the ternary lithium battery system that step (1) is arranged runs according to following steps:
A. singlechip controller communicates with ternary lithium battery voltage detection module, it is thus achieved that the voltage of each ternary lithium battery；
B. singlechip controller is according to the N number of ternary lithium battery voltage obtained, and finds out the ternary lithium battery that magnitude of voltage is maximum, and wherein N is be more than or equal to 2；
C. singlechip controller obtains the meansigma methods of all ternary lithium battery voltage；
D. jump into step e when the maximum ternary lithium battery voltage of magnitude of voltage and all ternary lithium battery average voltage deviations set threshold values more than one, otherwise return to step a；
E. singlechip controller is by controlling the first catalyst corresponding to the maximum ternary lithium battery of voltage and ternary lithium battery that the second catalyst makes magnitude of voltage maximum and heavy-current discharge resistor coupled in parallel, and ternary lithium battery is discharged；
F. waiting the time T of setting, singlechip controller disconnects all contactless contactors by control terminal, and program returns step a；
(3) complete step (2) namely to realize based on the monolithic processor controlled big current balance of ternary lithium battery.
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| CN201610337666.5A CN105811534A (en) | 2016-05-22 | 2016-05-22 | Singlechip microcomputer control based large current balancing method of ternary lithium battery |
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| CN201610337666.5A CN105811534A (en) | 2016-05-22 | 2016-05-22 | Singlechip microcomputer control based large current balancing method of ternary lithium battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026291A (en) * | 2016-07-19 | 2016-10-12 | 桂林理工大学 | Ternary lithium battery large-current equalization method based on DSP control |
| CN106385081A (en) * | 2016-11-11 | 2017-02-08 | 桂林理工大学 | Ternary lithium battery large-current equalizing method based on ARM control |
| CN106451656A (en) * | 2016-11-11 | 2017-02-22 | 桂林理工大学 | Ternary lithium battery large-current balance method based on FPGA (Field Programmable Gate Array) control |
| WO2024108819A1 (en) * | 2022-11-22 | 2024-05-30 | 维谛技术有限公司 | Battery cell voltage balancing method and apparatus and power supply system |
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Cited By (4)
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| CN106026291A (en) * | 2016-07-19 | 2016-10-12 | 桂林理工大学 | Ternary lithium battery large-current equalization method based on DSP control |
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| CN106451656A (en) * | 2016-11-11 | 2017-02-22 | 桂林理工大学 | Ternary lithium battery large-current balance method based on FPGA (Field Programmable Gate Array) control |
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Application publication date: 20160727 |