CN105652212A - Method for dynamically detecting consistency of battery pack - Google Patents
Method for dynamically detecting consistency of battery pack Download PDFInfo
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- CN105652212A CN105652212A CN201610083086.8A CN201610083086A CN105652212A CN 105652212 A CN105652212 A CN 105652212A CN 201610083086 A CN201610083086 A CN 201610083086A CN 105652212 A CN105652212 A CN 105652212A
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- internal resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a method for dynamically detecting the consistency of a battery pack. The method is characterized by comprising the following steps in a battery pack charging/discharging process: step 1, monitoring current and voltage of each single cell; step 2, capturing inrush current and/or inrush voltage; step 3, if capturing the inrush current and/or the inrush voltage, calculating direct-current inner resistance Rx of each single cell of the battery pack; and step 4, judging the consistency of the battery pack according to the direct-current inner resistance. The method disclosed by the invention can be used for carrying out consistency detection of the battery pack, and has the advantages of good timeliness, simplicity in operation, high accuracy, good practicability and easiness for popularization.
Description
Technical field
The present invention relates to set of cells dynamic monitoring applied technical field, specifically a kind of method of dynamic detection consistency of battery pack.
Background technology
In electric automobile field, there is so problem in the set of cells as the power resources of electric automobile: packages even with the same a collection of battery core through strict technology manufacture, these battery cores all can be variant, in use for some time, this species diversity is increasing, the speed that the capacity of some battery core can decay is had more a lot of soon than other normal battery cores inside final whole set of cells, it is embodied in the process of set of cells charge or discharge, these battery cores can early arrive at the cut-off point of charge/discharge, so not only affect the performance of whole battery bag, there is also potential safety hazard. set of cells can be done consistency detection by some BMS (battery management system) manufacturer when to charging electric vehicle, those battery cores prematurely reaching charge cutoff voltage is carried out labelling, in use these battery cores is done corresponding equilibrium. but there are following 2 defects in this detection mode:
1. do not possess real-time, in battery bag discharge process, the concordance of battery core can only be detected when charging, it is impossible to make BMS adjust in real time.
2. it is only able to detect the battery core having capacity problem in charging process, the battery core having capacity problem in discharge process can not be fully contemplated by.
Therefore design one can dynamically detect consistency of battery pack method is people's technical issues that need to address.
Summary of the invention
For the deficiency that above-mentioned prior art exists, a kind of method that it is an object of the invention to provide dynamic detection consistency of battery pack.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of method of dynamic detection consistency of battery pack, carries out following steps in battery set charge/discharge process:
Step one, is monitored the electric current of each monomer battery core, voltage;
Step 2, catches mutation current and/or mutation voltage;
Step 3, if capturing mutation current and/or mutation voltage, then calculates the DC internal resistance Rx of each monomer battery core of set of cells;
Step 4, judges consistency of battery pack according to DC internal resistance.
It is preferred that, the method for described dynamic detection consistency of battery pack also includes the step that the monomer battery core being judged as capacity attenuation exception carries out abnormal marking.
It is preferred that, described step one is particularly as follows: in car running process or in vehicle charging process, the voltage and current of the core that often economizes on electricity in set of cells is carried out monitoring record in real time by BMS.
It is preferred that, in described step 2, the condition of mutation current is: current change quantity is not less than 50%, current break slope is not less than 0.01A/ms and/or sudden change is held time and is not less than 1s.
It is preferred that, in described step 2, the condition of mutation voltage is: voltage variety is not less than 50%, voltage jump slope is not less than 01V/ms and/or sudden change is held time and is not less than 1s.
It is preferred that, described step 3 calculates the fall into a trap process of DC internal resistance R (x-n) of certain monomer battery core of the step of DC internal resistance Rx of each monomer battery core of set of cells and is:
Monomer current change quantity �� In on tested monomer battery core monomer voltage variable quantity �� Un ratio in current break and/or voltage jump process is obtained the DC internal resistance R (x-n) of this monomer battery core.
It is preferred that, described step 3 calculates the fall into a trap process of DC internal resistance R (x-n) of certain monomer battery core of the step of DC internal resistance Rx of each monomer battery core of set of cells and is:
After current break and/or voltage jump and in the first preset time period maintained, the monomer voltage meansigma methods Un of tested monomer battery core is obtained than monomer current average In the DC internal resistance Rx-n of monomer battery core.
It is preferred that, described first preset time period is 1s.
It is preferred that, in described step 4 according to DC internal resistance judge consistency of battery pack step particularly as follows:
DC internal resistance according to each monomer battery core calculated in step 3 calculates the mean direct internal resistance Rj of all monomer battery cores of set of cells;
The DC internal resistance Rx of each monomer battery core is compared with monomer battery core mean direct internal resistance Rj respectively;
If the difference of the DC internal resistance Rx of monomer battery core and monomer battery core mean direct internal resistance Rj exceedes default equilibrium condition, then judge that current monolithic battery core capacity attenuation is abnormal.
It is preferred that, described default equilibrium condition is that the ratio of the difference of the DC internal resistance Rx and monomer battery core mean direct internal resistance Rj of monomer battery core and monomer battery core mean direct internal resistance Rj is more than 5%.
Compared with prior art, the beneficial effects of the present invention is:
The method dynamically detecting consistency of battery pack that the present invention proposes, it is possible to all can carrying out the consistency detection of set of cells in set of cells charging, discharge process, ageing good and simple to operate, accuracy is high, and practicality is good, it is easy to promote.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is the broad flow diagram of the embodiment of the present invention 1;
Fig. 2 is the broad flow diagram of the embodiment of the present invention 2.
Detailed description of the invention
The following stated is only presently preferred embodiments of the present invention, does not therefore limit protection scope of the present invention.
Embodiment 1
As it is shown in figure 1, a kind of method of dynamic detection consistency of battery pack, battery set charge/discharge process carries out following steps:
Step one, is monitored the electric current of each monomer battery core, voltage;
Step 2, catches mutation current and/or mutation voltage;
Step 3, if capturing mutation current and/or mutation voltage, then calculates the DC internal resistance Rx of each monomer battery core of set of cells;
Step 4, judges consistency of battery pack according to DC internal resistance.
The method dynamically detecting consistency of battery pack that the present invention proposes, all can carry out the consistency detection of set of cells in set of cells charging, discharge process, and ageing good and simple to operate, accuracy is high, and practicality is good, it is easy to promote.
Embodiment 2
Embodiment 2 is a kind of improved procedure of embodiment 1, and with reference to Fig. 2, the method for described dynamic detection consistency of battery pack comprises the following steps:
S1 is in car running process or in vehicle charging process, and the voltage and current of the core that often economizes on electricity in set of cells is carried out monitoring record in real time by BMS.
S2 catches mutation current or mutation voltage. Wherein, the condition of mutation current is: (11) current change quantity is not less than 50%, (12) current break slope is not less than 0.01A/ms and (13) sudden change is held time and is not less than 1s. The condition of mutation current can also be set as meeting any one in above-mentioned (11), (12), (13) condition or combination in any. Additionally, current change quantity, current break slope, sudden change are held time and can be adjusted according to actual needs in above-mentioned (11), (12), (13) condition.
The condition of mutation voltage is: (21) voltage variety is not less than 50%, (22) voltage jump slope is not less than 01V/ms and (23) sudden change is held time and is not less than 1s. The condition of mutation voltage can also be set as meeting any one in above-mentioned (21), (22), (23) condition or combination in any. Additionally, voltage variety, voltage jump slope, sudden change are held time and can be adjusted according to actual needs in above-mentioned (21), (22), (23) condition.
When practical application, it is also possible to catch mutation current and mutation voltage, when simultaneously capturing sudden change and mutation voltage, just perform the DC internal resistance Rx that below step calculates each monomer battery core of set of cells simultaneously.
If S3 captures mutation current or mutation voltage, then calculate the DC internal resistance Rx of each monomer battery core of set of cells. In the present embodiment, calculating the fall into a trap process of DC internal resistance R (x-n) of certain monomer battery core of the step of DC internal resistance Rx of each monomer battery core of set of cells is:
Monomer current change quantity �� In on tested monomer battery core monomer voltage variable quantity �� Un ratio in current break and/or voltage jump process is obtained the DC internal resistance R (x-n) of this monomer battery core by S31.
Cell each in set of cells is adopted the operation in step S31 successively, until the DC internal resistance Rx[R (x-1) of all of monomer battery core, R (x-2), R (x-3) in set of cells, ..., R (x-k)] all calculate.
S4 judges consistency of battery pack according to DC internal resistance. Detailed process is as follows:
S41 calculates the mean direct internal resistance Rj of all monomer battery cores of set of cells according to the DC internal resistance of each monomer battery core calculated in step S3. Such as, for having the set of cells of K monomer battery core, mean direct internal resistance Rj=[R (x-1)+R (x-2)+...+R (x-k)]/K.
The DC internal resistance Rx of each monomer battery core is compared by S42 respectively with monomer battery core mean direct internal resistance Rj.
If the difference of the DC internal resistance Rx of S43 monomer battery core and monomer battery core mean direct internal resistance Rj exceedes default equilibrium condition, then judge that current monolithic battery core capacity attenuation is abnormal. Described default equilibrium condition is that the ratio of the difference of the DC internal resistance Rx and monomer battery core mean direct internal resistance Rj of monomer battery core and monomer battery core mean direct internal resistance Rj is more than 5%. That is, if the DC internal resistance of the n-th monomer battery core meets: | R (x-n)-Rj |/Rj >=5%, then the capacity attenuation of this n-th monomer battery core is abnormal.
The monomer battery core being judged as capacity attenuation exception is carried out abnormal marking by S5. Carried out the monomer battery core of abnormal marking using as battery management system set of cells is opened balanced time balanced object.
Embodiment 3
The present embodiment is the another kind of improved procedure of embodiment 1, and the difference technology of the present embodiment and embodiment 2 is:
Described step 3 calculates the fall into a trap process of DC internal resistance R (x-n) of certain monomer battery core of the step of DC internal resistance Rx of each monomer battery core of set of cells:
After current break and/or voltage jump and in the first preset time period maintained, the monomer voltage meansigma methods Un of tested monomer battery core is obtained than monomer current average In the DC internal resistance R (x-n) of monomer battery core.Described first preset time period is 1s.
Further technical scheme as the present invention: in described step 3, for being unsatisfactory for the electric current of the condition of arresting, voltage, enters the data acquisition proceeding voltage, electric current in step one.
In the present invention,
State-of-charge: battery use a period of time or lie idle for a long time after the ratio of capacity of residual capacity and its fully charged state;
Discharge-rate: the ratio of the rated capacity of discharge current and battery during battery discharge.
Further it is proposed that the method dynamically detecting consistency of battery pack, all can use for all electric automobiles, only change the kind of battery, also fall within this method scope.
The setting catching grab bar part to electric current, voltage, only changes the multiple of sudden change value, slope, holds time, also fall within this method scope.
Calculate DC internal resistance by mutation current, magnitude of voltage in electric automobile discharge process, only change the data acquisition to the time range before and after mutation current, voltage, also fall within this method scope.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms. Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention.
The above; it is only presently preferred embodiments of the present invention; not in order to limit the present invention, every any trickle amendment, equivalent replacement and improvement above example made according to the technical spirit of the present invention, should be included within the protection domain of technical solution of the present invention.
Claims (10)
1. the method for a dynamic detection consistency of battery pack, it is characterised in that carry out following steps in battery set charge/discharge process:
Step one, is monitored the electric current of each monomer battery core, voltage;
Step 2, catches mutation current and/or mutation voltage;
Step 3, if capturing mutation current and/or mutation voltage, then calculates the DC internal resistance Rx of each monomer battery core of set of cells;
Step 4, judges consistency of battery pack according to DC internal resistance.
2. the method for dynamic detection consistency of battery pack according to claim 1, it is characterised in that also include the step that the monomer battery core being judged as capacity attenuation exception is carried out abnormal marking.
3. the method for dynamic detection consistency of battery pack according to claim 1, it is characterized in that, described step one is particularly as follows: in car running process or in vehicle charging process, the voltage and current of the core that often economizes on electricity in set of cells is carried out monitoring record in real time by BMS.
4. the method for dynamic detection consistency of battery pack according to claim 1, it is characterized in that, in described step 2, the condition of mutation current is: current change quantity is not less than 50%, current break slope is not less than 0.01A/ms and/or sudden change is held time and is not less than 1s.
5. the method for dynamic detection consistency of battery pack according to claim 1, it is characterized in that, in described step 2, the condition of mutation voltage is: voltage variety is not less than 50%, voltage jump slope is not less than 01V/ms and/or sudden change is held time and is not less than 1s.
6. the method for dynamic detection consistency of battery pack according to claim 1, it is characterized in that, described step 3 calculates the fall into a trap process of DC internal resistance R (x-n) of certain monomer battery core of the step of DC internal resistance Rx of each monomer battery core of set of cells and is:
Monomer current change quantity �� In on tested monomer battery core monomer voltage variable quantity �� Un ratio in current break and/or voltage jump process is obtained the DC internal resistance R (x-n) of this monomer battery core.
7. the method for dynamic detection consistency of battery pack according to claim 1, it is characterized in that, described step 3 calculates the fall into a trap process of DC internal resistance R (x-n) of certain monomer battery core of the step of DC internal resistance Rx of each monomer battery core of set of cells and is:
After current break and/or voltage jump and in the first preset time period maintained, the monomer voltage meansigma methods Un of tested monomer battery core is obtained than monomer current average In the DC internal resistance Rx-n of monomer battery core.
8. the method for dynamic detection consistency of battery pack according to claim 7, it is characterised in that described first preset time period is 1s.
9. the method for dynamic detection consistency of battery pack according to claim 1, it is characterised in that in described step 4 according to DC internal resistance judge consistency of battery pack step particularly as follows:
DC internal resistance according to each monomer battery core calculated in step 3 calculates the mean direct internal resistance Rj of all monomer battery cores of set of cells;
The DC internal resistance Rx of each monomer battery core is compared with monomer battery core mean direct internal resistance Rj respectively;
If the difference of the DC internal resistance Rx of monomer battery core and monomer battery core mean direct internal resistance Rj exceedes default equilibrium condition, then judge that current monolithic battery core capacity attenuation is abnormal.
10. the method for dynamic detection consistency of battery pack according to claim 9, it is characterized in that, described default equilibrium condition is that the ratio of the difference of the DC internal resistance Rx and monomer battery core mean direct internal resistance Rj of monomer battery core and monomer battery core mean direct internal resistance Rj is more than 5%.
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Cited By (21)
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| CN106199457A (en) * | 2016-09-29 | 2016-12-07 | 福州福光电子有限公司 | The on-line quick detection apparatus and method of open-circuit cell in accumulator battery |
| CN106546924A (en) * | 2016-10-08 | 2017-03-29 | 浙江大学 | A kind of dynamic prediction method of automobile lithium battery performance |
| CN107037365A (en) * | 2016-11-16 | 2017-08-11 | 上海中兴派能能源科技股份有限公司 | A kind of measuring method of power lithium cell electric core |
| CN107139747A (en) * | 2017-05-15 | 2017-09-08 | 南昌大学 | Electric automobile |
| CN107187328A (en) * | 2017-05-17 | 2017-09-22 | 宁波普瑞均胜汽车电子有限公司 | Lithium ion battery management system and battery core monomer essential resistance on-line measurement diagnostic method |
| CN107632267A (en) * | 2017-09-12 | 2018-01-26 | 北京理工大学 | A kind of battery exception monomer localization method and system |
| CN107769303A (en) * | 2017-10-20 | 2018-03-06 | 常州普莱德新能源电池科技有限公司 | A kind of battery management method of electric automobile |
| CN108061856A (en) * | 2016-11-09 | 2018-05-22 | 广东大仓机器人科技有限公司 | The method for calculating battery capacity by measuring the internal resistance of cell in real time |
| CN108333515A (en) * | 2017-01-20 | 2018-07-27 | 硕天科技股份有限公司 | It can show the uninterrupted power system of internal resistance of cell information |
| CN108777328A (en) * | 2018-04-09 | 2018-11-09 | 江西优特汽车技术有限公司 | A kind of power battery decaying consistency management method |
| CN109188313A (en) * | 2018-11-17 | 2019-01-11 | 邓亚军 | A kind of power detector of rank time variant voltage acquisition principle |
| WO2019037112A1 (en) * | 2017-08-25 | 2019-02-28 | 深圳市云中飞网络科技有限公司 | Terminal device and battery abnormality monitoring method and monitoring system therefor |
| CN110261786A (en) * | 2019-07-02 | 2019-09-20 | 江西安驰新能源科技有限公司 | A kind of capacity test method of rectangular aluminum hull battery core |
| CN111157910A (en) * | 2019-12-30 | 2020-05-15 | 北京四维智联科技有限公司 | Method, device and equipment for diagnosing structural rationality of battery pack |
| CN112255550A (en) * | 2020-09-27 | 2021-01-22 | 万克能源科技有限公司 | Detection method for attenuation lithium battery in energy storage system |
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| CN107187328A (en) * | 2017-05-17 | 2017-09-22 | 宁波普瑞均胜汽车电子有限公司 | Lithium ion battery management system and battery core monomer essential resistance on-line measurement diagnostic method |
| WO2019037112A1 (en) * | 2017-08-25 | 2019-02-28 | 深圳市云中飞网络科技有限公司 | Terminal device and battery abnormality monitoring method and monitoring system therefor |
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