CN101917044A - Balance control method for lithium battery management system - Google Patents
Balance control method for lithium battery management system Download PDFInfo
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- CN101917044A CN101917044A CN 201010267200 CN201010267200A CN101917044A CN 101917044 A CN101917044 A CN 101917044A CN 201010267200 CN201010267200 CN 201010267200 CN 201010267200 A CN201010267200 A CN 201010267200A CN 101917044 A CN101917044 A CN 101917044A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 36
- 239000000178 monomer Substances 0.000 claims abstract description 33
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 230000032683 aging Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910018095 Ni-MH Inorganic materials 0.000 description 2
- 229910018477 Ni—MH Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a balance control method for a lithium battery management system. In the method, the consistency of batteries is achieved by a method of identifying and discharging overcharge (high-voltage) batteries by collecting the voltage of lithium battery monomers. In the method, the following modules are involved: a signal acquisition module, a system working condition judging module, a balance judging module and a balancing module. By precisely monitoring and controlling the state of lithium batteries, the method effectively controls the lithium batteries to keep consistent so that a lithium battery system operates safely and reliably.
Description
Technical field
The invention belongs to the lithium battery system field of new-energy automobile, relate in particular to a kind of lithium battery equalization methods.
Background technology
Along with global climate progressively worsens, urban atmospheric pollution aggravates and petroleum resources consume excessively, development energy-saving and environmental protection automobile has become the important directions of world car industrial technology innovation and the inevitable choice of automobile industry sustainable development.The development of new-energy automobile progressively enlarges, and the electrokinetic cell type that is applied at present on the new-energy automobile has: lead acid accumulator, Ni-MH battery, nickel-cadmium cell and lithium battery.Lithium battery because have that volume is little, energy density is high, storage life is long, premium properties such as memory-less effect, high voltage and self-discharge rate are low, will replace lead-acid battery, Ni-MH battery, become the winner of electrokinetic cell.
The principal element that influences electrokinetic cell performance and life-span comprises battery temperature, the internal resistance of cell, cell consistency etc., battery cell is because the otherness of manufacturing and environment for use, in the use of battery, the otherness of battery cell will progressively worsen, the inconsistency of lithium battery monomer not only influences the performance and the life-span of battery, and influence the safety of battery, lithium battery system always has the high battery of monomer voltage, other battery enters overcharge condition earlier in the group relatively, overcharge battery cell along with the charging constantly carrying out, polarization is strengthened, aggravation heats up, battery capacity reduces, and might in the short time after charging finishes, make the inside battery substance combustion, cause battery to be scrapped.
For the reliability that improves lithium battery and the fail safe of system, prolong the useful life of battery, management system should have the function to the battery cell equilibrium, and this patent has just proposed a kind of balance control method for lithium battery management system.
In existing patent, also once had battery balanced associated description, as practical New Name is the patent of the balancer of vehicle mounted dynamic battery group, this patent balancer medium power battery pack is made up of the cell of n series connection, comprise polarity unit, the DC/DC power inverter, linkage unit and the control unit that is used to control the switching of polarity unit polarity, described polarity unit comprises charging end polarity unit and discharge end polarity unit, the input of described charging end polarity unit is connected with the output of described DC/DC power inverter, the input of described DC/DC power inverter is connected with the output of charging end polarity unit, described linkage unit comprises n+1 group gate-controlled switch, described each group gate-controlled switch comprises gate-controlled switch (SW) that is connected with charging end polarity unit output and the gate-controlled switch (S) that is connected with discharge end polarity unit input, described gate-controlled switch (SW) and described gate-controlled switch (S) are connected in parallel on the negative pole of each cell, and n+1 group gate-controlled switch is connected the positive pole of n monomer.
And for example the patent of invention name is called the patent of lithium ion power storage battery equalizing circuit, invented a kind of lithium ion power storage battery equalizing circuit in this patent, each battery module has a cover equalizing circuit, at least two unit battery module series connection, battery module V positive and negative terminal is respectively succeeded electrical equipment J, serial connection self-healing fuse S, by change over switch K1, K2 meets discharge resistance R respectively, constant current control dcdc converter, in the integral battery door group, fill the low height of putting according to the target equalizing voltage of battery module setting and the maximum capacity difference or the maximum voltage difference of balance, switch constant current control dcdc converter charging or constant-resistance discharge by relay network.
Compare with existing patent, above-mentioned patent generally is to adopt the energy transfer method, it realizes that principle is the voltage that management system is monitored each battery cell, if voltage difference surpasses the scope that allows between battery cell, the management system control relay, control discharge resistance or electric capacity are connected with needing balanced battery cell, thereby realize energy consumption or transfer to battery cell, reach the purpose of battery cell equalization, but this battery cell equalization method cost height, need to consume certain energy, increased the difficulty of Machine Design and battery system heat management.
And the present invention does not need to change battery system structure or increase other extra circuit, can realize the equalization management of battery easily.
Summary of the invention
The present invention is directed to existing technological deficiency, providing a kind of does not need to change battery system structure or increases other extra circuit, can realize battery balanced control strategy method easily.
The technical problem that the present invention further will solve is: provide a kind of method that battery cell is discharged to reach the conforming balance control method of battery cell.
The balance control method for lithium battery management system that the present invention proposes is by forming with lower module: signal acquisition module, system condition judge module, harmonious judge module, balance module.
Described signal acquisition module: the real time data of battery cell voltage and total voltage in the collection battery system.
Described system condition judge module: system occurs the monomer voltage overpressure situation at any time and enters the emergency treatment operating mode, other fault occurs, then stops equalization operation, and pending fault is restarted equilibrium after eliminating.
Described harmonious judge module: by the monomer average electrical pressure reduction of high minimum compares with removing to high monomer voltage, and then it is unbalanced to judge whether battery pack occurs.
Described balance module: judge whether to occur unbalanced, if will carry out discharge process, to reach battery balanced purpose to the high battery cell of voltage.
The step of described method is as follows:
Gather earlier the real time data of battery cell voltage in the battery system and total voltage, and the data that collect are outputed in the system condition judge module by signal acquisition module;
Judge by the system condition judge module whether system's this moment operating mode of living in can be balanced, the monomer voltage overpressure situation appears at any time, then system enters the emergency treatment operating mode, disconnect all just at balancing battery monomer discharge switch, connect the battery cell discharge switch of all overvoltages, be the discharge of overvoltage battery cell; And other fault such as insulation fault, communication failure, the under-voltage fault of battery etc. appear, and system then stops equalization operation as passing in and out equilibrium, and pending fault is restarted equilibrium after eliminating;
When system enters equalization operation, carry out the judgement of battery balanced property by harmonious judge module, by the cell average electrical pressure reduction of high minimum compares with removing to high monomer cell voltage, and then it is unbalanced to judge whether battery pack occurs; When pressure reduction between the battery cell reaches when needing equilibrium condition greater than the numerical value of a certain setting, the sequence number of the battery cell that recording voltage is high, and calculate the time for balance of this monomer, and it is write in the balanced timer, enter equalization operation;
In balance module, introduce circulation aging coefficient ζ (%), described ζ is according to different circulation timei of corresponding different circulation aging coefficient, SOC difference according to battery cell is estimated ζ (%), and according to charging and discharging lithium battery characteristic orientation, is started pressure reduction according to monomer capacity, time for balance, equilibrium, calculate the discharge resistance resistance, as reach the entry condition of equalization operation, and will carry out discharge operation by discharge resistance to the highest monomer of voltage, reach battery balanced.
Compared with prior art, the purpose of this invention is to provide a kind of balance control method for lithium battery management system, comprise signal acquisition module, system condition judge module, harmonious judge module, balance module, this control method is by gathering the lithium battery monomer voltage, by comparison to voltage, the battery cell that overcharges or voltage is higher is carried out discharge process, to guarantee the consistency of battery, the method will effectively prolong the useful life of lithium battery, and provide guarantee to the fail safe of lithium battery.This control method is at the inner balance control method that adds of battery management system control strategy, balancer that need not to add and auxiliary equipment, on space and hardware, provide cost savings, and this control method system occurs the monomer voltage overpressure situation at any time and enters the emergency treatment operating mode, other fault occurs, then stop equalization operation, pending fault is restarted equilibrium after eliminating, can farthest carry out equilibrium control, make battery reach best user mode battery.
Description of drawings
The balance control method for lithium battery management system master-plan block diagram that Fig. 1 proposes for the present invention
The balance control method for lithium battery management system information acquisition module flow chart that Fig. 2 proposes for the present invention
The balance control method for lithium battery management system system condition judge module flow chart that Fig. 3 proposes for the present invention
The harmonious judge module flow chart of balance control method for lithium battery management system that Fig. 4 proposes for the present invention
The balance control method for lithium battery management system balance module flow chart that Fig. 5 proposes for the present invention
Embodiment
This control method comprises: signal acquisition module, system condition judge module, harmonious judge module, balance module.
Below in conjunction with accompanying drawing this balance control method for lithium battery management system part of module is described further.
Fig. 1 balance control method for lithium battery management system master-plan block diagram, the real time data of battery cell voltage and total voltage in the signal acquisition module collection battery system, and according to the data message of gathering, it is excessive to judge whether to occur between monomer overvoltage, the battery cell voltage pressure reduction, and, enter different processing modules according to the different operating modes that occur.
The information acquisition module flow chart of Fig. 2 balance control method for lithium battery management system, the real time data of battery cell voltage and total voltage in the collection battery system.This module is gathered battery cell monomer voltage and total voltage, and the data that collect are outputed in the system condition judge module.
The operating mode judge module flow chart of Fig. 3 balance control method for lithium battery management system system, system occurs the monomer voltage overpressure situation at any time and enters the emergency treatment operating mode, other fault such as insulation fault, communication failure, the under-voltage fault of battery etc. appear, system then stops equalization operation as passing in and out equilibrium so, and pending fault is restarted equilibrium after eliminating; This module is used for judging whether to occur the battery cell overvoltage, the battery cell overvoltage is the main cause that influences battery life, therefore this control method is considered as the emergency treatment operating mode with it, in case the battery cell overvoltage occurs, then disconnect balanced monomer discharge switch and connect overvoltage battery cell discharge switch, be the discharge of overvoltage monomer according to emergency treatment flag bit, balanced flag bit.
The harmonious judge module flow chart of Fig. 4 balance control method for lithium battery management system, pressure reduction is greater than the numerical value of a certain setting between battery cell, reach when needing equilibrium condition, check whether balanced timing finishes, as finishing, the sequence number K of the battery cell that recording voltage is high then, and the time for balance that calculates this monomer writes it in balanced timer, balanced timer timing enters equalization operation.
Fig. 5 is the equalization operation module flow chart of balance control method for lithium battery management system, introduce parameters such as circulation aging coefficient, charging and discharging lithium battery characteristic, monomer capacity, time for balance, balanced startup pressure reduction, calculate place value, as reach the entry condition of equalization operation, with beginning the highest monomer of voltage is carried out discharge operation by discharge resistance.As shown in Figure 5.Flow process begins need to judge whether equilibrium, as the needs equalization operation, then judge to need the balanced monomer K mark position 1 of whether will discharging, as do not put 1, then connect the discharge resistance of K monomer, and will discharge simultaneously flag bit and balanced mark position 1, as putting 1, then quit a program; Do not need equalization operation as judging, then carry out the judgement of balanced flag bit,, then write down the discharge operation flag bit and be 1 monomer sequence number T as balanced mark position 1, and disconnect T monomer discharge resistance, simultaneously with T battery discharge operation flag position and equalization operation mark position 0.Do not put 1 as balanced flag bit, then quit a program.
Claims (1)
1. balance control method for lithium battery management system, it is characterized in that: this control method is by gathering the lithium battery monomer voltage, by the comparison to voltage, the battery cell that overcharges or voltage is higher being carried out discharge process, guarantee the consistency of battery, the step of described method is as follows:
Gather earlier the real time data of battery cell voltage in the battery system and total voltage, and the data that collect are outputed in the system condition judge module by signal acquisition module;
Judge by the system condition judge module whether system's this moment operating mode of living in can be balanced, the monomer voltage overpressure situation appears at any time, then system enters the emergency treatment operating mode, disconnect the battery cell discharge switch in all equilibriums, connect the battery cell discharge switch of all overvoltages, be the discharge of overvoltage battery cell; And other fault such as insulation fault, communication failure, the under-voltage fault of battery etc. appear, and system then stops equalization operation as passing in and out equilibrium, and pending fault is restarted equilibrium after eliminating;
When system enters equalization operation, carry out the judgement of battery balanced property by harmonious judge module, by the cell average electrical pressure reduction of high minimum compares with removing to high monomer cell voltage, and then it is unbalanced to judge whether battery pack occurs; When pressure reduction between the battery cell reaches when needing equilibrium condition greater than the numerical value of a certain setting, the sequence number of the battery cell that recording voltage is high, and calculate the time for balance of this monomer, and it is write in the balanced timer, enter equalization operation;
In balance module, introduce circulation aging coefficient ζ (%), described ζ is according to different circulation timei of corresponding different circulation aging coefficient, SOC difference according to battery cell is estimated ζ (%), and according to charging and discharging lithium battery characteristic orientation, is started pressure reduction according to monomer capacity, time for balance, equilibrium, calculate the discharge resistance resistance, as reach the entry condition of equalization operation, and will carry out discharge operation by discharge resistance to the highest monomer of voltage, reach battery balanced.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437603A (en) * | 2011-10-25 | 2012-05-02 | 重庆长安汽车股份有限公司 | Lithium battery management system balance control method |
| CN102570526A (en) * | 2010-12-28 | 2012-07-11 | 北京八恺电气科技有限公司 | Battery balancing control method and device as well as electric automobile |
| CN103475063A (en) * | 2013-09-25 | 2013-12-25 | 重庆长安汽车股份有限公司 | Method for dynamic balance control over lithium ion battery |
| CN104079016A (en) * | 2013-03-28 | 2014-10-01 | 比亚迪股份有限公司 | Battery pack equalizing system and battery pack equalizing control method |
| CN104135041A (en) * | 2014-04-21 | 2014-11-05 | 东莞钜威新能源有限公司 | Diagnosis method and diagnosis equipment of battery cell |
| US9013147B2 (en) | 2012-02-08 | 2015-04-21 | O2Micro, Inc. | Circuit and method for cell balancing |
| CN105044609A (en) * | 2015-07-09 | 2015-11-11 | 重庆长安汽车股份有限公司 | Battery balance function effect testing method and system |
| CN105093125A (en) * | 2015-07-30 | 2015-11-25 | 国家电网公司 | Single nickel-hydrogen battery consistency evaluation system and method |
| 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 |
| 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 |
| CN107452998A (en) * | 2017-07-21 | 2017-12-08 | 山东大学 | Vehicle mounted dynamic battery balance policy based on battery charge state |
| WO2019042355A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| WO2019042357A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| CN111231767A (en) * | 2019-12-31 | 2020-06-05 | 浙江合众新能源汽车有限公司 | Battery charging protection system and method applied to new energy electric automobile |
| CN111654072A (en) * | 2020-04-30 | 2020-09-11 | 南方电网科学研究院有限责任公司 | Battery SOC balance control method and device of energy storage system |
| CN114024349A (en) * | 2021-11-04 | 2022-02-08 | 许继集团有限公司 | Balanced protection control method for series-parallel combined battery cluster |
| CN114122538A (en) * | 2021-11-09 | 2022-03-01 | 浙江浙能技术研究院有限公司 | Balanced starting and balanced ending method for lithium battery management system |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570526A (en) * | 2010-12-28 | 2012-07-11 | 北京八恺电气科技有限公司 | Battery balancing control method and device as well as electric automobile |
| CN102437603A (en) * | 2011-10-25 | 2012-05-02 | 重庆长安汽车股份有限公司 | Lithium battery management system balance control method |
| US9013147B2 (en) | 2012-02-08 | 2015-04-21 | O2Micro, Inc. | Circuit and method for cell balancing |
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| CN104079016A (en) * | 2013-03-28 | 2014-10-01 | 比亚迪股份有限公司 | Battery pack equalizing system and battery pack equalizing control method |
| CN103475063A (en) * | 2013-09-25 | 2013-12-25 | 重庆长安汽车股份有限公司 | Method for dynamic balance control over lithium ion battery |
| CN104135041A (en) * | 2014-04-21 | 2014-11-05 | 东莞钜威新能源有限公司 | Diagnosis method and diagnosis equipment of battery cell |
| 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 |
| CN105044609A (en) * | 2015-07-09 | 2015-11-11 | 重庆长安汽车股份有限公司 | Battery balance function effect testing method and system |
| CN105093125A (en) * | 2015-07-30 | 2015-11-25 | 国家电网公司 | Single nickel-hydrogen battery consistency evaluation system and method |
| 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 |
| CN107452998A (en) * | 2017-07-21 | 2017-12-08 | 山东大学 | Vehicle mounted dynamic battery balance policy based on battery charge state |
| WO2019042355A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| WO2019042357A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| CN111231767A (en) * | 2019-12-31 | 2020-06-05 | 浙江合众新能源汽车有限公司 | Battery charging protection system and method applied to new energy electric automobile |
| CN111654072A (en) * | 2020-04-30 | 2020-09-11 | 南方电网科学研究院有限责任公司 | Battery SOC balance control method and device of energy storage system |
| CN114024349A (en) * | 2021-11-04 | 2022-02-08 | 许继集团有限公司 | Balanced protection control method for series-parallel combined battery cluster |
| CN114024349B (en) * | 2021-11-04 | 2024-06-18 | 许继集团有限公司 | Balanced protection control method for serial-parallel combined battery cluster |
| CN114122538A (en) * | 2021-11-09 | 2022-03-01 | 浙江浙能技术研究院有限公司 | Balanced starting and balanced ending method for lithium battery management system |
| CN114122538B (en) * | 2021-11-09 | 2023-10-03 | 浙江浙能技术研究院有限公司 | Balanced starting and balancing ending method for lithium battery management system |
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