CN101917044B - Balance control method for lithium battery management system - Google Patents

Balance control method for lithium battery management system Download PDF

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Publication number
CN101917044B
CN101917044B CN 201010267200 CN201010267200A CN101917044B CN 101917044 B CN101917044 B CN 101917044B CN 201010267200 CN201010267200 CN 201010267200 CN 201010267200 A CN201010267200 A CN 201010267200A CN 101917044 B CN101917044 B CN 101917044B
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China
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battery
voltage
monomer
discharge
battery cell
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CN 201010267200
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Chinese (zh)
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CN101917044A (en
Inventor
朴昌浩
杨辉前
赵立波
王进
付文利
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重庆长安汽车股份有限公司
重庆长安新能源汽车有限公司
重庆邮电大学
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Priority to CN 201010267200 priority Critical patent/CN101917044B/en
Publication of CN101917044A publication Critical patent/CN101917044A/en
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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

A kind of balance control method for lithium battery management system

A kind of balance control method for lithium battery management system

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 Auto Industry technological 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, the 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 affects 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 procedure of battery, the otherness of battery cell will progressively worsen, the inconsistency of lithium battery monomer not only affects performance and the life-span of battery, and affect 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 make the inside battery substance combustion in the short time after charging finishes, cause battery to be scrapped.

For reliability and the Security of the system that improves lithium battery, 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, be the patent of the balancer of vehicle mounted dynamic battery group such as practical New Name, this patent balancer medium power battery pack is comprised of the cell of n series connection, comprise polarity unit, the DC/DC power inverter, linkage unit and the control unit that switches for control 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 the 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 to the positive pole of n monomer.

And for example the patent of invention name is called the patent of equalizing circuit for lithium ion power accumulator, invented a kind of equalizing circuit for lithium ion power accumulator 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 respectively discharge resistance R, 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 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, controlled 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 is high, 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 easily the equalization management of battery.

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 easily battery balanced control strategy method.

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 the monomer voltage overpressure situation occurs 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 there is carrying out discharge process to the high battery cell of voltage, to reach battery balanced purpose.

The step of described method is as follows:

Gathered first the real time data of battery cell voltage in the battery system and total voltage by signal acquisition module, and the data that collect are outputed in the system condition judge 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, battery undervoltage fault 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, judge the most whether the cell average electrical pressure reduction of high minimum reaches pressure reduction to monomer battery voltage with removing, 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, check whether balanced timing finishes, as finishing, 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 circulation aging coefficient corresponding to different circulation timei, 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 the 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, the balancer that need not to add and auxiliary equipment, in the space and hardware provide cost savings, and this control method system the monomer voltage overpressure situation occurs 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 to battery, make battery reach best use state.

Description of drawings

Fig. 1 is the balance control method for lithium battery management system master-plan block diagram that the present invention proposes

Fig. 2 is the balance control method for lithium battery management system information acquisition module flow chart that the present invention proposes

Fig. 3 is the balance control method for lithium battery management system system condition judge module flow chart that the present invention proposes

Fig. 4 is the harmonious judge module flow chart of balance control method for lithium battery management system that the present invention proposes

Fig. 5 is the balance control method for lithium battery management system balance module flow chart that the present invention proposes

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 that gathers, it is excessive to judge whether to occur between monomer overvoltage, the battery cell voltage pressure reduction, and according to the different operating modes that occur, enter different processing modules.

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 gathers 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 the monomer voltage overpressure situation occurs at any time and enters the emergency treatment operating mode, other fault such as insulation fault, communication failure, battery undervoltage fault 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 affects 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 according to emergency treatment flag bit, balanced flag bit and connect overvoltage battery cell discharge switch, be the discharge of overvoltage monomer.

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 then recording voltage is high, 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 the 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, such 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, such as balanced mark position 1, then record the discharge operation flag bit and be 1 monomer sequence number T, and disconnect T monomer discharge resistance, simultaneously with T battery discharge operation flag position and equalization operation mark position 0.Do not put 1 such 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, judge the most whether the cell average electrical pressure reduction of high minimum reaches pressure reduction to monomer battery voltage with removing, the battery cell that overcharges or voltage is higher is carried out discharge process, guarantee the consistency of battery, the step of described method is as follows:
Gathered first the real time data of battery cell voltage in the battery system and total voltage by signal acquisition module, and the data that collect are outputed in the system condition judge 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 insulation fault, communication failure, battery undervoltage fault 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, judge the most whether the cell average electrical pressure reduction of high minimum reaches pressure reduction to monomer battery voltage with removing, 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, check whether balanced timing finishes, as finishing, 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 circulation aging coefficient corresponding to different circulation timei, 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.
CN 201010267200 2010-08-31 2010-08-31 Balance control method for lithium battery management system CN101917044B (en)

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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
CN104079016B (en) * 2013-03-28 2017-06-06 比亚迪股份有限公司 Battery pack balancing system and its balance 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
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
CN107452998B (en) * 2017-07-21 2019-12-17 山东大学 Vehicle-mounted power battery equalization method based on battery charge state
CN110015169A (en) * 2017-08-31 2019-07-16 比亚迪股份有限公司 Battery equalization method, system, vehicle, storage medium and electronic equipment
CN110015178A (en) * 2017-08-31 2019-07-16 比亚迪股份有限公司 Battery equalization method, system, vehicle, storage medium and electronic equipment

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