CN103475063A - Method for dynamic balance control over lithium ion battery - Google Patents
Method for dynamic balance control over lithium ion battery Download PDFInfo
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- CN103475063A CN103475063A CN2013104418892A CN201310441889A CN103475063A CN 103475063 A CN103475063 A CN 103475063A CN 2013104418892 A CN2013104418892 A CN 2013104418892A CN 201310441889 A CN201310441889 A CN 201310441889A CN 103475063 A CN103475063 A CN 103475063A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a method for dynamic balance control over a lithium ion battery. The method comprises the steps that standing time of the power battery is judged according to finished vehicle parking time; after the standing time is sufficient, the current voltage of the battery is determined to be in the real battery state, and whether balance needs to be conducted or not is judged according to current dropout voltage; meanwhile, an appropriate resistor is chosen to discharge according to the range of the dropout voltage and balance time is controlled. The method for dynamic balance control over the lithium ion battery has the advantages that the balance process occurs in the finished vehicle operation process, namely after the decision that the balance process needs to be conducted is made, a balance order is executed through the method, and a finished vehicle order is responded, so that charging and discharging control over the battery is achieved; according to the dropout voltage of single bodies, the balance resistor can be appropriately chosen and the balance time can be controlled.
Description
Technical field
The present invention relates to a kind of lithium ion battery dynamic equalization control method, belong to the lithium battery system field of new-energy automobile.
Background technology
Practice shows that the battery cell life-span is longer than the battery assembly life-span, this is because the battery assembly is to be in series by battery cell, and the use of battery assembly is often in imbalance, and the imbalance of storage battery can constantly aggravate along with charge and discharge cycles, the most serious impaired battery cell life-span impairment causes the battery pack life-span impairment at place, thereby the life-span of the whole battery system that detracts, although battery pack is comprised of the cell of same specification, but the reasons such as inhomogeneities of battery pack internal environment in the technique of manufacturing due to cell and use procedure, along with the increase of using practice, performance difference between cell will widen gradually, some cell super-charge super-discharge will do not caused if do not take measures, not only affect battery life and overcharge and cross to put, for battery capacity, it is also a threat.
At present existing many battery management systems are studied balanced management, a kind of balance control method for lithium battery management system that for example Patent document number is CN101917044A, this patent judges whether to need equilibrium according to monomer pressure reduction in the battery dynamic process, and in Considering Dynamic Processes, whether this pressure reduction can truly not reflect battery status; A kind of novel battery equalizer control system and control method thereof that Patent document number is CN 102064586A, this patent judges whether battery discharge or charging according to battery pressure reduction, but do not consider to choose charging and discharging currents according to pressure differential range, in order to control time for balance.
Therefore, also there is further improved necessity in existing battery balanced control method.
Summary of the invention
In view of this, the invention provides a kind of lithium ion battery dynamic equalization control method, effectively to reduce monomer voltage difference between battery pack.The present invention's car load Parking time judgement electrokinetic cell time of repose of giving chapter and verse, after reaching enough time of repose, judgement battery current voltage is the battery time of day, and judges whether to need equilibrium according to pressure reduction now; Also the give chapter and verse scope of pressure reduction of the present invention is chosen proper resistor and is discharged, and controls time for balance.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of lithium ion battery dynamic equalization control method, it adopts by the system formed with lower module and completes: balanced judge module, system judge module, balance parameters configuration module, equilibrium and process diagnostic module.
Described control method comprises the following steps:
Step 1: judged whether to carry out equilibrium according to all monomer voltages of car load Parking time and collection by balanced judge module.
Step 2: by the system judge module, judge whether Full Vehicle System exists safety failure or can't respond equilibrium in special operation condition.
Step 3: according to being checked through current monomer pressure differential range, select suitable equalizing resistance by the balance parameters configuration module, the too high battery of monomer voltage is discharged.
Step 4: carry out equalization operation by equilibrium and process diagnostic module, and detect in real time in balancing procedure safety failure whether occurs.
In described step 1, balanced judge module is the open circuit voltage characteristic according to terminal voltage after the lithium ion battery sufficient standing, judges battery balanced situation, and particular content comprises:
Step 1.1: judge whether the car load Parking time be greater than X (determine according to the battery actual conditions, usually be set to 0.5 hour) hour, as be greater than, do not forbid equilibrium.
Step 1.2: judge between all battery cells that whether pressure reduction is at U1≤△ U≤U2, if △ were U >=during U2, between monomer, differential pressure would be excessive, can't to it, compensate by balanced way, now abandons equilibrium.
Step 1.3: need balanced battery cell by its balanced mark position 1 step 2 judgement, send to the system judge module.
System judge module in step 2 of the present invention is for judging the Full Vehicle System state.Particular content comprises:
Step 2.1: judge whether car load exists critical failure, whether car load is current can respond battery balanced action.
Step 2.2: judge that car load, whether at the operation special operation condition, during as the climbing power-assisted, needs the high-power output of electrokinetic cell, now forbid battery is carried out to equalization operation.
Step 2.3: according to step 2.1,2.2 judged results, enter the balance parameters configuration module.
In step 3 of the present invention, the balance parameters configuration module, according to pressure reduction configuration equalizing resistance between cell, is chosen euqalizing current, specifically comprises:
Step 3.1: judgement monomer magnitude of pressure differential, choose different equalizing resistances, the configuration euqalizing current.
Step 3.2: according to the equalizing resistance of choosing, set time for balance Y minute, and enter into equilibrium and process diagnostic module.
Step 4 of the present invention, equilibrium and process diagnostic module are for judging whether balancing procedure breaks down and whether equilibrium finishes, and specifically comprises:
Step 4.1: carry out equilibrium and calculate time for balance.
Step 4.2: judge whether time for balance is greater than the time of setting in step 3.2, as overtime balanced the end.
Step 4.3: judge in balancing procedure and safety failure whether occurs, as the problem such as battery assembly insulation occurs, balanced the end.
From above control step, this control method is by the collection to car load electrokinetic cell time of repose and lithium battery monomer voltage, the method that higher battery is discharged by voltage reaches the consistency of battery, the method advantage is that balancing procedure occurs in the car load running, after i.e. judgement needs to open equilibrium, control method also responds the car load order when carrying out balanced order battery is discharged and recharged to control, and the advantage of this method also is according to magnitude of pressure differential between monomer, can suitably choose equalizing resistance, control time for balance.
The accompanying drawing explanation
In order to be illustrated more clearly in example of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in example or description of the Prior Art be briefly described.
The general flow chart that Fig. 1 is lithium ion battery dynamic equalization control method;
The workflow diagram of the balanced judge module that Fig. 2 is lithium ion battery dynamic equalization control method;
The workflow diagram of the system judge module that Fig. 3 is lithium ion battery dynamic equalization control method;
The workflow diagram of the balance parameters configuration module that Fig. 4 is lithium ion battery dynamic equalization control method;
The equilibrium that Fig. 5 is lithium ion battery dynamic equalization control method and the workflow diagram of process diagnostic module.
Embodiment
Below in conjunction with Figure of description, technical scheme of the present invention is described in further detail.
A kind of lithium ion battery balance control method disclosed by the invention, this control method is by the collection to car load electrokinetic cell time of repose and lithium battery monomer voltage, the method that higher battery is discharged by voltage reaches the consistency of battery, the method has increased the useful life of lithium battery greatly, and provides guarantee to the fail safe of lithium battery.
The general flow chart of Fig. 1 lithium ion battery dynamic equalization control method, this control method adopts with lower module and realizes, comprising: balanced judge module S101, system judge module S102, balance parameters configuration module S103, equilibrium and process diagnostic module S104.
After car load powers on, balanced judge module S101 is according to the car load Parking time and gather monomer voltage and judge whether to carry out equilibrium, and enters into different processing modules according to judged result, and responds car load in balancing procedure simultaneously battery charging and discharging is managed.
The workflow diagram of the balanced judge module S101 of Fig. 2 lithium ion battery dynamic equalization control method:
Step S1011: after powering on according to car load, judge whether the car load Parking time be greater than X (determine according to the battery actual conditions, lithium battery is set to 0.5 hour usually), and whether the batteries monomer voltage collected for judgement can truly reflect battery status;
Step S1012: according to the monomer voltage collected, judge monomer pressure reduction whether meet U1≤△ U≤U2(wherein U1, U2 according to test data, obtain, 5Ah lithium battery U1 is 0.2V, U2 is 0.5V), if meet, cell needs equilibrium; If △ were U >=during U2, between monomer, differential pressure would be excessive, can't to it, compensate by balanced way, now abandons equilibrium.
Step S1013: need the balanced normal place 1 of balanced monomer to send to system judge module S102 step S1012 judgement.
The workflow diagram of the system judge module S102 of Fig. 3 lithium ion battery dynamic equalization control method:
Step S1021: judge whether Full Vehicle System exists safety failure, whether can respond equalization operation, in order to guarantee balanced open stage, do not have potential safety hazard.
Step S1022: judge whether car load is carrying out special operation condition and can't respond equalization operation, during as the climbing power-assisted, need the high-power output of electrokinetic cell, now forbid battery is carried out to equalization operation.
The workflow diagram of Fig. 4 lithium ion battery dynamic equalization control method balance parameters configuration module S103:
Step S1031: the monomer pressure reduction calculated according to step S1012, choose euqalizing current, the method that this patent provides is based in the equalizing circuit design and comprises optional equalizing resistance, according to pressure differential range, chooses different equalizing resistance (being different discharging currents) and carries out equilibrium;
Step S1032: set time for balance (balanced 2 hours of 30mA, balanced 0.6 hour of 100mA, avoid causing energy too much to lose in the equalization discharge process) according to euqalizing current, guarantee that battery cell can reach consistent at the appointed time after equilibrium several times.
The equilibrium of Fig. 5 lithium ion battery dynamic equalization control method and the workflow diagram of process diagnostic module S104:
Step S1041: calculate time for balance;
Step S1042: judge whether time for balance reaches setting-up time (being set by step S1032), as overtime balanced the end.
Step S1043: judge in balancing procedure and potential safety hazard whether occurs, as balanced end of breaking down, the balanced flag bit of removing after equilibrium completes, and continue to carry out the car load order.
Claims (5)
1. a lithium ion battery dynamic equalization control method, it comprises the following steps:
Step 1: judged whether to carry out equilibrium according to all monomer voltages of car load Parking time and collection by balanced judge module;
Step 2: by the system judge module, judge whether Full Vehicle System exists safety failure or can't respond equilibrium in special operation condition;
Step 3: according to being checked through current cell pressure differential range, select suitable equalizing resistance by the balance parameters configuration module, the too high battery of monomer voltage is discharged;
Step 4: carry out equalization operation by equilibrium and process diagnostic module, and detect in real time in balancing procedure safety failure whether occurs.
2. lithium ion battery dynamic equalization control method according to claim 1, it is characterized in that: in described step 1, balanced judge module is to be the open circuit voltage characteristic according to terminal voltage after the lithium ion battery sufficient standing, judges battery balanced situation, is specially:
Step 1.1: judge whether the car load Parking time be greater than X hour, as be greater than, do not forbid equilibrium; Enter step 1.2 as be greater than;
Step 1.2: judge between all battery cells that whether pressure reduction is at U1≤△ U≤U2, if △ were U >=during U2, between monomer, differential pressure would be excessive, can't to it, compensate by balanced way, now abandons equilibrium; In above-mentioned scope, judgement needs equilibrium, enters step 1.3 in this way;
Step 1.3: need balanced battery cell by its balanced mark position 1 step 1.2 judgement, send to the system judge module.
3. lithium ion battery dynamic equalization control method according to claim 2, it is characterized in that: X is set to 0.5 hour usually.
3. lithium ion battery dynamic equalization control method according to claim 1 is characterized in that the detailed process of described step 2 is as follows:
Step 2.1: judge whether car load exists critical failure, whether car load is current can respond battery balanced action, in this way, carries out next step;
Step 2.2: judge that car load, whether at the operation special operation condition, during as the climbing power-assisted, needs the high-power output of electrokinetic cell, now forbid battery is carried out to equalization operation; If not, carry out next step;
Step 2.3: according to step 2.1,2.2 judged results, enter the balance parameters configuration module.
4. lithium ion battery dynamic equalization control method according to claim 1, the balance parameters configuration module that it is characterized in that described step 3 is according to pressure reduction configuration equalizing resistance between cell, chooses euqalizing current, detailed process is as follows:
Step 3.1: judgement monomer magnitude of pressure differential, choose different equalizing resistances, the configuration euqalizing current;
Step 3.2: according to the equalizing resistance of choosing, set time for balance Y minute, and enter into equilibrium and process diagnostic module.
5. lithium ion battery dynamic equalization control method according to claim 1, is characterized in that equilibrium in described step 4 and process diagnostic module are for judging balancing procedure and whether break down and whether equilibrium finishing, and detailed process is as follows:
Step 4.1: carry out equilibrium and calculate time for balance;
Step 4.2: judge whether time for balance is greater than the time of setting in step 3.2, as overtime balanced the end.
Step 4.3: judge in balancing procedure and safety failure whether occurs, as the problem such as battery assembly insulation occurs, balanced the end.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956800A (en) * | 2014-05-22 | 2014-07-30 | 山东大学 | Self-adaptive fuzzy balancing control method based on historical balancing speed |
| CN104882914A (en) * | 2014-02-28 | 2015-09-02 | 重庆邮电大学 | Multi-battery cell balancing 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 |
| CN106932722A (en) * | 2015-12-30 | 2017-07-07 | 华为技术有限公司 | The internal short-circuit detection method and device of a kind of electrokinetic cell |
| CN108710085A (en) * | 2018-06-06 | 2018-10-26 | 安徽江淮汽车集团股份有限公司 | A kind of monomer Selection method and system to be equalized of power battery |
| CN109428130A (en) * | 2017-08-31 | 2019-03-05 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109428362A (en) * | 2017-09-03 | 2019-03-05 | 湖州南浔遨优电池有限公司 | A kind of active equalization policy optimization method of battery management system |
| CN109428356A (en) * | 2017-08-31 | 2019-03-05 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109428363A (en) * | 2017-09-03 | 2019-03-05 | 湖州南浔遨优电池有限公司 | A kind of passive balance policy optimization method of battery management system |
| CN110492555A (en) * | 2019-07-25 | 2019-11-22 | 宿州市艾尔新能源有限公司 | A kind of equal balance system and its control method of high capacity cell |
| CN110682831A (en) * | 2018-06-19 | 2020-01-14 | 广州汽车集团股份有限公司 | Vehicle-mounted power battery equalization method and device and automobile |
| CN110729797A (en) * | 2019-11-13 | 2020-01-24 | 昆山宝创新能源科技有限公司 | Vehicle and battery pack balance control method, device and system thereof |
| CN112290109A (en) * | 2020-10-30 | 2021-01-29 | 重庆长安新能源汽车科技有限公司 | Lithium ion battery balance maintenance method based on cloud platform |
| CN113794258A (en) * | 2021-09-18 | 2021-12-14 | 江苏金派克新能源有限公司 | Whole-process equalization method for lithium battery pack |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882914A (en) * | 2014-02-28 | 2015-09-02 | 重庆邮电大学 | Multi-battery cell balancing method |
| CN104882914B (en) * | 2014-02-28 | 2017-03-15 | 重庆邮电大学 | Multi-battery cell balancing method |
| CN103956800A (en) * | 2014-05-22 | 2014-07-30 | 山东大学 | Self-adaptive fuzzy balancing control method based on historical balancing speed |
| CN103956800B (en) * | 2014-05-22 | 2016-06-08 | 山东大学 | A kind of adaptive fuzzy balance control method using for reference history balancing speed |
| 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 |
| CN106932722A (en) * | 2015-12-30 | 2017-07-07 | 华为技术有限公司 | The internal short-circuit detection method and device of a kind of electrokinetic cell |
| CN109428356B (en) * | 2017-08-31 | 2022-02-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN109428130A (en) * | 2017-08-31 | 2019-03-05 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109428130B (en) * | 2017-08-31 | 2020-09-15 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN109428356A (en) * | 2017-08-31 | 2019-03-05 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109428363A (en) * | 2017-09-03 | 2019-03-05 | 湖州南浔遨优电池有限公司 | A kind of passive balance policy optimization method of battery management system |
| CN109428362A (en) * | 2017-09-03 | 2019-03-05 | 湖州南浔遨优电池有限公司 | A kind of active equalization policy optimization method of battery management system |
| CN109428363B (en) * | 2017-09-03 | 2022-09-06 | 浙江遨优动力系统有限公司 | Passive equalization strategy optimization method of battery management system |
| CN109428362B (en) * | 2017-09-03 | 2022-09-09 | 浙江遨优动力系统有限公司 | Active equalization strategy optimization method of battery management system |
| CN108710085A (en) * | 2018-06-06 | 2018-10-26 | 安徽江淮汽车集团股份有限公司 | A kind of monomer Selection method and system to be equalized of power battery |
| CN110682831A (en) * | 2018-06-19 | 2020-01-14 | 广州汽车集团股份有限公司 | Vehicle-mounted power battery equalization method and device and automobile |
| CN110682831B (en) * | 2018-06-19 | 2021-05-14 | 广州汽车集团股份有限公司 | Vehicle-mounted power battery equalization method and device and automobile |
| CN110492555A (en) * | 2019-07-25 | 2019-11-22 | 宿州市艾尔新能源有限公司 | A kind of equal balance system and its control method of high capacity cell |
| CN110729797A (en) * | 2019-11-13 | 2020-01-24 | 昆山宝创新能源科技有限公司 | Vehicle and battery pack balance control method, device and system thereof |
| CN112290109A (en) * | 2020-10-30 | 2021-01-29 | 重庆长安新能源汽车科技有限公司 | Lithium ion battery balance maintenance method based on cloud platform |
| CN113794258A (en) * | 2021-09-18 | 2021-12-14 | 江苏金派克新能源有限公司 | Whole-process equalization method for lithium battery pack |
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Application publication date: 20131225 |