CN105652212B - Method for dynamically detecting consistency of battery pack - Google Patents
Method for dynamically detecting consistency of battery pack Download PDFInfo
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- CN105652212B CN105652212B CN201610083086.8A CN201610083086A CN105652212B CN 105652212 B CN105652212 B CN 105652212B CN 201610083086 A CN201610083086 A CN 201610083086A CN 105652212 B CN105652212 B CN 105652212B
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- battery core
- internal resistance
- single battery
- current
- voltage
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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
-
- 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
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- 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 dynamic detection set of cells is consistent
The method of property.
Background technology
In electric automobile field, there are problems that so one as the set of cells of the power resources of electric automobile：Even
Packaged using the same a collection of battery core manufactured through strict technology, these battery cores all can be variant, in use for some time,
This species diversity is increasing, has the speed that the capacity of some battery cores can decay more normal than other inside final whole set of cells
Battery core is many soon, and during being embodied in set of cells charge or discharge, these battery cores can early arrive at the cut-off of charge/discharge
Point, so not only affects the performance of whole battery bag, also there is potential safety hazard.Some BMS (battery management system) manufacturer is right
Consistency detection can be done to set of cells during charging electric vehicle, rower is entered to those battery cores for prematurely reaching charge cutoff voltage
These battery cores are done corresponding equilibrium by note when in use.But there are following 2 defects in this detection mode：
1. do not possess real-time, the concordance of battery core in battery bag discharge process, can only be detected when charging, no
BMS can be made to carry out real-time adjustment.
2. being only able to detect has the battery core of capacity problem in charging process, has in can not being fully contemplated by discharge process
The battery core of capacity problem.
Therefore design one kind can be people's technical issues that need to address in dynamic detection consistency of battery pack method.
The content of the invention
For the deficiency that above-mentioned prior art is present, it is an object of the invention to provide a kind of dynamic detection consistency of battery pack
Method.
To achieve these goals, the technical solution adopted in the present invention is：
A kind of method of dynamic detection consistency of battery pack, follows the steps below during battery set charge/discharge：
Step one, the electric current, voltage to each single battery core are monitored；
Step 2, catches mutation current and/or mutation voltage；
Step 3, if capturing mutation current and/or mutation voltage, calculates in the direct current of each single battery core of set of cells
Resistance Rx；
Step 4, judges consistency of battery pack according to DC internal resistance.
It is preferred that, the method for the dynamic detection consistency of battery pack is also included to being judged as capacity attenuation exception
Single battery core the step of carry out abnormal marking.
It is preferred that, the step one is specially：In car running process or in automobile charging process, BMS pair
The voltage and current of the core that often economizes on electricity in set of cells carries out real-time monitoring and records.
It is preferred that, in the step 2, the condition of mutation current is：Current change quantity is not less than 50%, electric current and dashes forward
Variable slope is not less than 0.01A/ms and/or mutation is held time and is not less than 1s.
It is preferred that, in the step 2, the condition of mutation voltage is：Voltage variety is not less than 50%, voltage and dashes forward
Variable slope is not less than 01V/ms and/or mutation is held time and is not less than 1s.
It is preferred that, certain is fallen into a trap the step of the step 3 calculates DC internal resistance Rx of set of cells each single battery core
The process of DC internal resistance R (x-n) of individual single battery core is：
Tested single battery core is single on the monomer voltage variable quantity △ Un ratios during current break and/or voltage jump
Body current change quantity △ In obtain DC internal resistance R (x-n) of the single battery core.
It is preferred that, certain is fallen into a trap the step of the step 3 calculates DC internal resistance Rx of set of cells each single battery core
The process of DC internal resistance R (x-n) of individual single battery core is：
After current break and/or voltage jump and in the first preset time period of maintenance, by the list of tested single battery core
Bulk voltage meansigma methodss Un obtain DC internal resistance Rx-n of single battery core than monomer current average In.
It is preferred that, first preset time period is 1s.
It is preferred that, it is specially the step of judge consistency of battery pack according to DC internal resistance in the step 4：
The average of all single battery cores of set of cells is calculated according to the DC internal resistance of each single battery core calculated in step 3
DC internal resistance Rj；
DC internal resistance Rx of each single battery core is compared with single battery core mean direct internal resistance Rj respectively；
If DC internal resistance Rx of single battery core exceedes default balanced bar with the difference of single battery core mean direct internal resistance Rj
Part, then judge current monolithic battery core capacity attenuation exception.
It is preferred that, the default equilibrium condition is averagely straight with single battery core for DC internal resistance Rx of single battery core
The ratio of the difference and single battery core mean direct internal resistance Rj of stream internal resistance Rj is more than 5%.
Compared with prior art, the beneficial effects of the present invention is：
The method of dynamic detection consistency of battery pack proposed by the present invention, can be in set of cells charging, discharge process
The consistency detection of set of cells can be carried out, ageing good and simple to operate, accuracy is high, and practicality is good, it is easy to promote.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples：
Broad flow diagrams of the Fig. 1 for the embodiment of the present invention 1；
Broad flow diagrams of the Fig. 2 for the embodiment of the present invention 2.
Specific embodiment
Described below is only presently preferred embodiments of the present invention, is not intended to limit the scope of the present invention.
Embodiment 1
As shown in figure 1, a kind of method of dynamic detection consistency of battery pack, is carried out during battery set charge/discharge following
Step：
Step one, the electric current, voltage to each single battery core are monitored；
Step 2, catches mutation current and/or mutation voltage；
Step 3, if capturing mutation current and/or mutation voltage, calculates in the direct current of each single battery core of set of cells
Resistance Rx；
Step 4, judges consistency of battery pack according to DC internal resistance.
The method of dynamic detection consistency of battery pack proposed by the present invention, charges in set of cells, can be with discharge process
The consistency detection of set of cells is carried out, ageing good and simple to operate, accuracy is high, and practicality is good, it is easy to promote.
Embodiment 2
A kind of improved procedure of the embodiment 2 for embodiment 1, with reference to Fig. 2, the method for the dynamic detection consistency of battery pack
Comprise the following steps：
S1 is in car running process or in automobile charging process, BMS to set of cells in the core that often economizes on electricity voltage and electricity
Stream carries out real-time monitoring and records.
S2 catches mutation current or mutation voltage.Wherein, the condition of mutation current is：(11) current change quantity is not less than
50%th, (12) current break slope is not less than 0.01A/ms and (13) mutation is held time and is not less than 1s.The condition of mutation current
Above-mentioned (11), (12), any one or combination in any in (13) condition can also be set as meeting.Additionally, above-mentioned (11),
(12), in (13) condition, current change quantity, current break slope, mutation are held time and can be adjusted according to actual needs.
The condition of mutation voltage is：(21) voltage variety is not less than 50%, (22) voltage jump slope and is not less than 01V/
Ms and (23) mutation are held time and are not less than 1s.The condition of mutation voltage can also be set as meeting above-mentioned (21), (22), (23)
Any one in condition or combination in any.Additionally, above-mentioned (21), (22), voltage variety, voltage jump are oblique in (23) condition
Rate, mutation are held time and can be adjusted according to actual needs.
In practical application, it is also possible to while mutation current and mutation voltage are caught, while capturing mutation and being mutated electricity
DC internal resistance Rx that below step calculate each single battery core of set of cells is performed during pressure.
If S3 captures mutation current or mutation voltage, DC internal resistance Rx of each single battery core of set of cells is calculated.
In the present embodiment, the DC internal resistance of certain single battery core of falling into a trap the step of DC internal resistance Rx for calculating each single battery core of set of cells
The process of R (x-n) is：
Monomer voltage variable quantity △ Un ratios of the S31 by tested single battery core during current break and/or voltage jump
Upper monomer current change quantity △ In obtain DC internal resistance R (x-n) of the single battery core.
To each cell in set of cells successively using the operation in step S31, until all of monomer in set of cells
DC internal resistance Rx of battery core【R (x-1), R (x-2), R (x-3) ... ..., R (x-k)】Calculate.
S4 judges consistency of battery pack according to DC internal resistance.Detailed process is as follows：
S41 calculates the flat of all single battery cores of set of cells according to the DC internal resistance of each single battery core calculated in step S3
Equal DC internal resistance Rj.For example, for the set of cells with K single battery core, mean direct internal resistance Rj=【R(x-1)+R(x-2)
+……+R(x-k)】/K。
DC internal resistance Rx of each single battery core is compared by S42 respectively with single battery core mean direct internal resistance Rj.
If DC internal resistance Rx of S43 single battery cores exceedes default balanced with the difference of single battery core mean direct internal resistance Rj
Condition, then judge current monolithic battery core capacity attenuation exception.DC internal resistance Rx of the default equilibrium condition for single battery core
With the ratio of the difference and single battery core mean direct internal resistance Rj of single battery core mean direct internal resistance Rj more than 5%.If that is, n-th
The DC internal resistance of single battery core meets：|R(x-n)-Rj|/Rj>=5%, then the capacity attenuation exception of n-th single battery core.
S5 carries out abnormal marking to being judged as the abnormal single battery core of capacity attenuation.The single battery core of abnormal marking is carried out
Using the balanced object as battery management system when balanced to set of cells unlatching.
Embodiment 3
The present embodiment is another kind of improved procedure of embodiment 1, and the present embodiment with the difference technology of embodiment 2 is：
The step of step 3 calculates DC internal resistance Rx of set of cells each single battery core is fallen into a trap certain single battery core
The process of DC internal resistance R (x-n) is：
After current break and/or voltage jump and in the first preset time period of maintenance, by the list of tested single battery core
Bulk voltage meansigma methodss Un obtain DC internal resistance R (x-n) of single battery core than monomer current average In.First Preset Time
Section is 1s.
As the further technical scheme of the present invention：In described step three, for be unsatisfactory for the condition of arresting electric current,
Voltage, proceeds the data acquisition of voltage, electric current in step one.
In the present invention,
State-of-charge：Residual capacity of the battery using a period of time or after lying idle for a long time and its fully charged state
The ratio of capacity；
Discharge-rate：The ratio of the rated capacity of discharge current and battery during battery discharge.
Further it is proposed that dynamic detection consistency of battery pack method, for all electric automobiles can all be used,
Only change the species of battery, also fall within this method scope.
To electric current, the setting for catching grab bar part of voltage, only change multiple, the slope of mutation value, hold time, also fall within we
Method scope.
DC internal resistance is calculated by mutation current, magnitude of voltage in electric automobile discharge process, only change to mutation current,
The data acquisition of the time range before and after voltage, also falls 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, Er Qie
In the case of spirit or essential attributes without departing substantially from the present invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
The above, only presently preferred embodiments of the present invention, not to limit the present invention, every skill according to the present invention
Any trickle amendment, equivalent and improvement that art is substantially made to above example, should be included in technical solution of the present invention
Protection domain within.
Claims (2)
1. a kind of method of dynamic detection consistency of battery pack, it is characterised in that carry out during battery set charge/discharge following
Step：
Step one, the electric current, voltage to each single battery core are monitored；
Step 2, catches mutation current and/or mutation voltage；
Step 3, if capturing mutation current and/or mutation voltage, calculates the DC internal resistance of each single battery core of set of cells
Rx；
Step 4, judges consistency of battery pack according to DC internal resistance；
The step one is specially：In car running process or in automobile charging process, BMS to set of cells in often economize on electricity core
Voltage and current carry out real-time monitoring and record；
In the step 2, the condition of mutation current is：Current change quantity is not less than 50%, current break slope and is not less than
0.01A/ms and/or mutation are held time and are not less than 1s；
In the step 2, the condition of mutation voltage is：Voltage variety is not less than 50%, voltage jump slope and is not less than 0.1V/
Ms and/or mutation are held time and are not less than 1s；
The step of step 3 calculates DC internal resistance Rx of set of cells each single battery core is fallen into a trap the direct current of certain single battery core
The process of internal resistance R (x-n) is：
After current break and/or voltage jump and in the first preset time period of maintenance, by the monomer electricity of tested single battery core
Flatten DC internal resistance Rx-n that average Un obtains single battery core than monomer current average In；
First preset time period is 1s；
The step of judging consistency of battery pack according to DC internal resistance in the step 4 is specially：
The mean direct of all single battery cores of set of cells is calculated according to the DC internal resistance of each single battery core calculated in step 3
Internal resistance Rj；
DC internal resistance Rx of each single battery core is compared with single battery core mean direct internal resistance Rj respectively；
If DC internal resistance Rx of single battery core exceedes default equilibrium condition with the difference of single battery core mean direct internal resistance Rj,
Judge current monolithic battery core capacity attenuation exception；
The default equilibrium condition for DC internal resistance Rx and the single battery core mean direct internal resistance Rj of single battery core difference with
The ratio of single battery core mean direct internal resistance Rj is more than 5%；Also include to being judged as that it is different that the abnormal single battery core of capacity attenuation is carried out
Often the step of labelling；
In described step three, for the electric current, the voltage that are unsatisfactory for the condition of arresting, proceed in step one voltage,
The data acquisition of electric current.
2. the method for dynamic detection consistency of battery pack according to claim 1, it is characterised in that the step 3 is calculated
The step of DC internal resistance Rx of set of cells each single battery core, the fall into a trap process of DC internal resistance R (x-n) of certain single battery core was：
By tested single battery core, on the monomer voltage variable quantity △ Un ratios during current break and/or voltage jump, monomer is electric
Stream variable quantity △ In obtain DC internal resistance R (x-n) of the single battery core.
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