CN104377776B - A kind of efficiently passive balance control method of lithium ion battery used for electric vehicle - Google Patents
A kind of efficiently passive balance control method of lithium ion battery used for electric vehicle Download PDFInfo
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- CN104377776B CN104377776B CN201410671123.8A CN201410671123A CN104377776B CN 104377776 B CN104377776 B CN 104377776B CN 201410671123 A CN201410671123 A CN 201410671123A CN 104377776 B CN104377776 B CN 104377776B
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention proposes a kind of efficiently passive balance control method of lithium ion battery used for electric vehicle, and by controlling equalization temperature and the balanced number of monomer, the battery cell high to voltage discharges, so as to reach the purpose of monomer the being consistent property low with cell voltage.Battery pack includes the minimum cell with minimum voltage, include the magnitude of voltage all cells bigger than minimum monomer voltage, it is N number of comprising the cell for being more than predetermined threshold value with minimum monomer voltage difference, allow to open cell M in a balanced way simultaneously comprising current.Work as M<During N, M cell before voltage highest is chosen in N number of monomer and opens balanced, until the voltage of highest monomer in M cell, which is less than, does not open the voltage of highest cell in monomer in a balanced way, balanced judgement is re-started；Conversely, N number of monomer is then all turned on equilibrium, and certain time re-starts balanced judgement again.
Description
Technical field
The present invention relates to lithium ion battery of electric automobile management system, more particularly to battery balanced control method.
Background technology
For the battery pack by multiple monomer compositions, due to temperature difference and battery efficiency it is inconsistent, often
The capacity status of individual monomer is different.Passively target is that the high monomer of capacity is discharged into one low with capacity in a balanced way
Cause, to reach the purpose of the capacity equilibrium in charge and discharge process.
The patent of existing passive balancing technique Patent No. " CN201010572115.X "《Battery balanced device》Only say
Understand that battery high to capacity by way of parallel resistance is discharged, but because battery bag is that sealing system is filled without radiating
Put, the resistance heating during balanced discharge, voltage acquisition chip temperature can be raised constantly, it is more that battery opens number in a balanced way
Temperature rising is faster, when temperature rises to certain value, can influence the acquisition precision of monomer voltage, final to damage voltage acquisition chip
And Acquisition Circuit.
To solve above-mentioned drawback, it is necessary to a kind of method for controlling equalization temperature and the balanced number of monomer is provided, electronic
Balance route is efficiently carried out in the passive equilibrium of automobile lithium ion battery.
The content of the invention
The problem of present invention is directed to the above proposes a kind of efficiently passive balance control method of lithium ion battery used for electric vehicle,
By controlling equalization temperature and the balanced number of monomer, the battery cell high to voltage discharges, so as to reach and cell voltage
The purpose of low being consistent property of monomer.
Passive equalization methods of the present invention, mainly elaborate the mistake for how controlling to open which monomer equalization discharge
Journey, methods described step is as follows：
The voltage of all cells in battery pack is gathered, and obtains the minimum cell of monomer voltage accordingly；
Calculate the difference between the voltage of other monomers battery and the voltage of the minimum monomer of voltage；
Pressure difference is compared with predetermined threshold value, as long as there is a pressure difference to exceed predetermined threshold value, illustrates battery needs
It is balanced；
Calculate the cell number N that all pressure differences are more than predetermined threshold value；
The N number of cell for meeting pressure differential is ranked up according to magnitude of pressure differential；
The relation declined according to selected battery discharge time and voltage, calculates monomer voltage highest cell balanced
To the balanced discharge time T of target voltage；
According to balanced discharge time and balancing chip temperature rise situation, calculating can be while opens cell in a balanced way
Number M；
If N>M, the preceding M cell high to monomer voltage opens balanced discharge, conversely, then it is in need to institute in a balanced way
N number of cell opens balanced discharge.
Cell number N in a balanced way is needed if opening cell number M in a balanced way and being less than, when in the balanced monomer of unlatching
The voltage of voltage highest monomer closes current all monomers less than when not opening the voltage of voltage highest monomer in balanced monomer
Equilibrium, redefining needs monomer in a balanced way and it is resequenced, so circulation.Conversely, when then balanced open time delay is default
Between after, close the equilibrium of current all cells, redefine needs and cell and it is resequenced in a balanced way, so
Circulation.
Compared with prior art, the advantage of the invention is that：
1st, the present invention can open the equilibrium of multiple batteries simultaneously, and avoid heating from causing voltage acquisition chip and Acquisition Circuit
The problem of damage；
2nd, the present invention can be calculated in real time opens battery number in a balanced way simultaneously, improves equalization efficiency；
3rd, the present invention open it is balanced after to continue for some time, it is to avoid it is frequent the problem of open balanced；
4th, the present invention when opening that highest monomer voltage is not than opening that highest monomer voltage is low in a balanced way in a balanced way to needs
Monomer re-starts sequence in a balanced way, and the monomer high to voltage after rearrangement opens balanced.
By using passive balance control method of the present invention, it is possible to reduce or it is inconsistent existing between elimination monomer
As so as to improve the charge-discharge performance of battery pack and extend the service life of battery.
Brief description of the drawings
Fig. 1 show the efficient balance control method of lithium ion battery of electric automobile of the present invention.
Embodiment
In order to better illustrate the present invention, be easy to the understanding of those skilled in the art, below in conjunction with the accompanying drawings and specific implementation
Example, describes the implementation process of the present invention.
Fig. 1 show the passive balance control method flow chart of one embodiment of the present of invention.
In one embodiment, battery pack includes the minimum cell with minimum voltage, comprising magnitude of voltage than minimum
The big all cells of monomer voltage, bag N number of comprising the cell for being more than predetermined threshold value with minimum monomer voltage difference
Allow to open cell M in a balanced way simultaneously containing current.Work as M<During N, M list before voltage highest is chosen in N number of monomer
Body battery opens balanced, and highest monomer in monomer in a balanced way is not opened when the voltage of highest monomer in M cell is less than
During the voltage of battery, balanced judgement is re-started；Conversely, N number of monomer is then all turned on equilibrium, and certain time is weighed again
It is new to carry out balanced judgement.
In a step 102, the voltage of each cell is monitored.And the minimum cell of cell voltage is found out, remember
Record monomer voltage CellV_min and monomer CellNo_min.
At step 104, the voltage difference between each cell and minimum cell is calculated, recording voltage is poor
DeltaV_i, monomer voltage CellV_i and monomer CellNo_i.
In step 106, if one of voltage difference DeltaV_i is more than a default threshold value, step is gone to
108, otherwise go to step 102.Had been described before the step of after step 102, do not do repeated description again for simplicity.
In step 108, the monomer that all voltage differences are more than predetermined threshold value is added up, calculates and meet voltage difference
The monomer number of condition.In one embodiment, it is necessary to which the cell number that balanced discharge operation is carried out to it is N.
In step 110, N number of monomer of balanced discharge is carried out according to voltage difference size the need for being calculated to step 108
Sequence.In one embodiment, according to 1,2,3 ... N order, the pressure difference of No. 1 monomer is minimum in N number of monomer, N monomers
Pressure difference it is maximum, every number monomer has the monomer CellNo_i and corresponding monomer voltage CellV_i of the unique mark monomer.
In step 112, discharged according to selected battery with certain discharge current, obtain discharge time and the pass of voltage decline
System, calculates the balanced discharge time that monomer voltage highest monomer is balanced to target voltage；In one embodiment, discharge electricity
Balanced discharge electric current when being opened for equilibrium is flowed, maximum time for balance is T.
In step 114, according to time for balance T and balancing chip temperature rise situation, calculating can be while opens equilibrium
Monomer number；In one embodiment, the maximum operating temperature T_max that balancing chip allows is set, according to testing
Go out the balancing chip in time for balance T and rise to maximum temperature T_max at most permissions from Current Temperatures while opening single in a balanced way
Body number M.
In step 116, if allowing unlatching simultaneously, monomer number M is less than needs monomer total number N in a balanced way in a balanced way,
Go to step 118；Otherwise, step 122. is gone to
In step 118, to needing to open in N number of monomer in a balanced way, M monomer opens balanced before pressure difference highest.One
In individual embodiment, to N-M+1, N-M+2 ..., N monomers open balanced, and equilibrium is not turned on to 1,2 ... N-M monomers.
In the step 120, if opening ceiling voltage in monomer in a balanced way is less than highest in the monomer do not opened in equilibrium
Voltage, goes to step 126；Otherwise step 120 is maintained at, balanced discharge is continued to opening monomer in a balanced way.In one embodiment
In, when N monomer voltages are less than N-M monomer voltages, illustrating current unlatching, monomer voltage is more equal than not opening in a balanced way
The monomer voltage of weighing apparatus is low, and, it is necessary to recalculate unlatching, monomer is numbered in a balanced way, goes to step 126.
In step 122, it is all turned on equilibrium to needing to open N number of monomer in a balanced way.In one embodiment, to 1,
2 ... N monomers are switched on equilibrium.
In step 124, preset time is persistently opened to opening monomer in a balanced way.In one embodiment, preset certain
Time, timing is started after opening equilibrium, when accumulative time for balance is less than preset time, balanced is opened to N number of monomer always.
In step 126, the equilibrium of all monomers is closed, step 102 is returned to and starts a new cycle.In an implementation
In example, if M<N, to N-M+1, N-M+2 ..., N monomers are closed balanced；Otherwise, 1,2 ... N monomers are closed balanced.Return to
Mathematic interpolation and pressure difference sequence are re-started after step 102, to that can open balanced by monomer in a balanced way, is circulated with this.
The efficiently passive balance control method of lithium ion battery of electric automobile disclosed by the invention, it is adaptable to hybrid vehicle
The equilibrium of lithium ion battery, it is intended to which the battery cell of a relatively high to voltage carries out balanced discharge, reduces the difference between monomer, from
And improve whole battery bag charge-discharge performance.
It should be noted that any obvious replacement is in the present invention on the premise of without departing from present inventive concept
Protection domain within.
Claims (1)
1. the efficiently passive balance control method of lithium ion battery used for electric vehicle, methods described step is as follows：
The voltage of all cells in battery pack is gathered, and obtains the minimum cell of monomer voltage accordingly；
Calculate the difference between the voltage of other monomers battery and the voltage of the minimum cell of voltage；
Pressure difference is compared with predetermined threshold value, as long as there is a pressure difference to exceed predetermined threshold value, illustrates that battery needs equilibrium；
Calculate the cell number N that all pressure differences are more than predetermined threshold value；
The N number of cell for meeting pressure differential is ranked up according to magnitude of pressure differential；
The relation declined according to selected battery discharge time and voltage, calculates monomer voltage highest cell and is balanced to mesh
Mark the balanced discharge time T of voltage；
According to balanced discharge time and balancing chip temperature rise situation, calculating can be while opens cell number in a balanced way
M；The maximum operating temperature T_max that a balancing chip allows is set, the balancing chip in time for balance T is drawn according to experiment
Rising to maximum temperature T_max from Current Temperatures at most allows while opening monomer number M in a balanced way；
If N>M, the preceding M cell high to monomer voltage opens balanced discharge, conversely, then in need N number of in a balanced way to institute
Cell opens balanced discharge；
Cell number N in a balanced way is needed if opening monomer number M in a balanced way and being less than, when voltage highest in the balanced monomer of unlatching
The voltage of monomer closes the equal of current all cells less than when not opening the voltage of voltage highest monomer in balanced monomer
Weighing apparatus, redefining needs cell in a balanced way and it is resequenced, so circulation；Conversely, then balanced open time delay is preset
After time, the equilibrium of current all cells is closed, redefining needs cell in a balanced way and it is resequenced, such as
This circulation, until completing balanced.
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| CN201410671123.8A CN104377776B (en) | 2014-11-20 | 2014-11-20 | A kind of efficiently passive balance control method of lithium ion battery used for electric vehicle |
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| CN104377776B true CN104377776B (en) | 2017-07-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105119022A (en) * | 2015-03-04 | 2015-12-02 | 重庆长安汽车股份有限公司 | Lithium ion battery equalization control enablement method and quitting method for hybrid vehicle |
| CN105044609B (en) * | 2015-07-09 | 2017-11-14 | 重庆长安汽车股份有限公司 | The method of testing and system of battery cell equalization function effect |
| CN105762869A (en) * | 2016-03-30 | 2016-07-13 | 张家港绿锂动力技术有限公司 | Battery pack equalization control method and system |
| CN106100015B (en) * | 2016-06-13 | 2018-07-31 | 郑州精益达汽车零部件有限公司 | A kind of passive balancing control circuit and control method of vehicle mounted battery management system |
| CN108063293B (en) * | 2016-11-09 | 2020-11-20 | 比亚迪股份有限公司 | Battery pack balance control method and control system |
| CN106627212A (en) * | 2016-11-28 | 2017-05-10 | 墨宝股份有限公司 | Efficient passive balance control method for lithium ion batteries of electric vehicles |
| CN110015185B (en) | 2017-08-31 | 2022-09-06 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN109927590A (en) * | 2017-12-18 | 2019-06-25 | 杭州三花研究院有限公司 | A kind of battery control system, control method and electric automobile air-conditioning system |
| CN108767911A (en) * | 2018-04-27 | 2018-11-06 | 天津市捷威动力工业有限公司 | A method of it is balanced based on open-circuit voltage and capacity difference control |
| CN110994054A (en) * | 2018-10-02 | 2020-04-10 | 江西格林德能源有限公司 | Method for rapidly balancing voltage of each battery cell of battery pack |
| CN109450027A (en) * | 2018-11-23 | 2019-03-08 | 安徽江淮汽车集团股份有限公司 | Lithium ion battery equalization methods |
| CN109494850B (en) * | 2019-01-08 | 2022-05-03 | 奇瑞汽车股份有限公司 | Battery pack balancing method, device and system |
| CN112217243B (en) * | 2019-12-30 | 2022-04-08 | 蜂巢能源科技有限公司 | Inter-module balancing method, device and equipment based on bidirectional active balancing |
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| CN102801184B (en) * | 2011-05-24 | 2015-08-26 | 比亚迪股份有限公司 | A kind of batteries management system |
| US9966758B2 (en) * | 2012-06-11 | 2018-05-08 | Panduit Corp. | Capacitor-based UPS |
| CN103326439B (en) * | 2013-06-28 | 2016-11-02 | 安科智慧城市技术（中国）有限公司 | The equalizing circuit of set of cells and method |
| CN103887853B (en) * | 2014-03-18 | 2016-01-13 | 浙江大学城市学院 | A kind of Li-ion batteries piles balance control method |
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Effective date of registration: 20191231 Address after: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Patentee after: Chongqing Chang'an Automobile Co., Ltd. Address before: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Co-patentee before: Chongqing Chang'an New Energy Automobile Co., Ltd. Patentee before: Chongqing Chang'an Automobile Co., Ltd. |
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