CN115343649A - Method for detecting consistency of battery cells of battery pack - Google Patents
Method for detecting consistency of battery cells of battery pack Download PDFInfo
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- CN115343649A CN115343649A CN202211270000.4A CN202211270000A CN115343649A CN 115343649 A CN115343649 A CN 115343649A CN 202211270000 A CN202211270000 A CN 202211270000A CN 115343649 A CN115343649 A CN 115343649A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a method for detecting consistency of battery cells of a battery pack, which comprises the following steps: acquiring a voltage sequence of each battery cell of the battery pack in the charging and/or discharging process; carrying out data cleaning on the voltage sequence to obtain a cleaned voltage sequence; calculating a voltage deviation sequence between any two electricity-saving cores; carrying out white noise detection on the voltage deviation sequence, wherein if the voltage deviation sequence is a white noise sequence, the states of the two power cores are consistent; if the voltage deviation sequence is not a white noise sequence, the states of the two power cores are inconsistent. The invention provides a brand new, feasible and simple idea to solve the problem of inconsistent battery cells of the battery pack by utilizing the characteristic that inconsistent battery cell voltages are different from other normal battery cell voltages, and the distinctiveness is not random information but has a time sequence relation.
Description
Technical Field
The invention relates to the technical field of detection of power batteries of electric vehicles, in particular to a method for detecting consistency of battery cells of a battery pack.
Background
Due to the influences of factors such as process level limitation, different working conditions during use, environment difference, battery management, battery core abnormity and the like, different battery core states on the same vehicle may be inconsistent, if the conditions cannot be identified in time, the battery core problem of the battery pack becomes more serious along with the use of the vehicle, and even the problems of vehicle lying, battery leakage and the like are caused, so that the driving safety is damaged.
Patent document with publication number CN112505557A discloses a method for dynamically evaluating cell consistency, which mainly comprises the following steps: and recording the voltage U (i) charge or voltage U (i) discharge of each battery cell, and if the absolute value of the difference between the U charge and the U (i) charge is between [0 and delta U charge ] or the absolute value of the difference between the U (i) discharge and the U discharge is between [0 and delta U discharge ], preliminarily judging that the battery cell with the serial number of i is poor in consistency. The method adopts a pressure difference threshold mode, namely a threshold value needs to be preset, and a conclusion is directly made by judging whether the pressure difference falls into the threshold value or not. The method may generate false alarm through threshold one-time cutting, and the reliability of the detection result is poor.
Research shows that for inconsistent cells, the terminal voltage of the inconsistent cells in the charge/discharge stage can be distinguished from other cells, and the distinction has a time sequence relation, namely, the historical distinguishing degree has a certain influence on the future distinguishing degree, and the inconsistent cells in the battery pack are found by utilizing the characteristic.
Disclosure of Invention
The invention aims to provide a method for detecting the consistency of battery cells of a battery pack, which overcomes the defect that the existing method for detecting the consistency of the battery cells of the battery pack possibly generates false alarm.
The invention realizes the purpose through the following technical scheme:
a method for detecting consistency of battery pack cells comprises the following steps:
s1, acquiring a voltage sequence of each battery cell of a battery pack in a charging and/or discharging process:
wherein, in the step (A),
is as follows
The voltage value of the electricity-saving core is selected,
the amount of data obtained;
s2, carrying out data cleaning on the voltage sequence to obtain a cleaned voltage sequence
Wherein, in the process,
is the first after cleaning
The voltage value of the electricity-saving core is taken,
the data volume after cleaning;
s3, calculating a voltage deviation sequence between any two power saving cores:
wherein, in the step (A),
and
represents two different battery cores;
s4, for the voltage deviation sequence
Performing a white noise test if the voltage deviation sequence
If the sequence is white noise sequence, the states of the two power cores are consistent; if the voltage deviation sequence
And if the two power core states are not white noise sequences, the two power core states are inconsistent.
In a further improvement, in step S2, the data is cleaned to set upper and lower threshold values of the voltage, and error data except the threshold values are removed.
The further improvement is that in the step S4, the white noise test mode is one of an autocorrelation graph, a Box-Pierce test and an Ljung-Box test.
The invention has the beneficial effects that:
(1) The inconsistent cell voltage is different from other normal cell voltages, and the difference is not random information but has the characteristic of time sequence relation, so that a brand new, feasible and simple idea is provided to solve the problem of inconsistent battery cells.
(2) Compared with the traditional method for detecting the voltage difference threshold value by directly comparing the voltage deviation values of the two groups of battery cells, the method does not need to set the threshold value, and avoids the false alarm generated when the threshold value is cut once in the traditional method.
(3) The algorithm is simple to implement, the result accuracy is high, and the method is easy to popularize.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic diagram illustrating comparison of voltage data at terminals of cells 1 to 8;
fig. 3 is a schematic diagram of a deviation sequence of the battery cells 4 and 3;
FIG. 4 is a schematic diagram showing the upper and lower timings of the offset sequence created using the offset sequence data of FIG. 3.
Detailed Description
The present application will now be described in further detail with reference to the drawings, and it should be noted that the following detailed description is given for purposes of illustration only and should not be construed as limiting the scope of the present application, as these numerous insubstantial modifications and variations can be made by those skilled in the art based on the teachings of the present application.
As shown in fig. 1, a method for detecting consistency of battery cells includes the following steps:
s1, acquiring a voltage sequence of each battery cell of a battery pack in a charging and/or discharging process:
wherein, in the process,
is as follows
The voltage value of the electricity-saving core is selected,
the amount of data obtained;
here, two battery cells are taken as an example:
s2, setting upper and lower voltage limit thresholds, removing error data except the thresholds, and performing data cleaning on the two voltage sequences to obtain cleaned voltage sequences
Respectively as follows:
wherein, the first and the second end of the pipe are connected with each other,
the data volume after washing.
S3, calculating to obtain a voltage deviation sequence between the two power saving cores:
s4, for the voltage deviation sequence
Carrying out white noise detection, wherein the white noise detection can be carried out by specifically selecting an autocorrelation graph, a Box-Pierce detection mode and an Ljung-Box detection mode;
if voltage deviation sequence
For a white noise sequence, according to the nature of white noise in mathematics, it can be known that the voltage arrays of the two battery cores do not contain other information after subtraction, and all the information is random information which can not be captured, that is to say, the information contained in the voltage data of the two battery cores is the same, and the states of the two battery cores are consistent; if the voltage deviation sequence
The two-core-voltage-difference-based power supply is not a white noise sequence, namely the sequence obtained by subtracting the voltage arrays of the two power supply cores is not random and contains other related information, and the states of the two power supply cores are inconsistent.
The principle of the invention is as follows: for an inconsistent cell, the terminal voltage of the cell in the charge/discharge stage can be distinguished from other cells, taking 8 sections of cells as an example, referring to fig. 2, terminal voltage data of cells 1-8 are shown, in the figure, a cell 4 is an inconsistent cell (a single dotted line at the lower part in the figure represents the cell 4), and the terminal voltage is obviously distinguished from other cells; the difference has a time sequence relationship, that is, the historical difference has a certain influence on the future difference, referring to fig. 3 and fig. 4, the terminal voltage data of the battery cell 3 and the battery cell 4 are taken for analysis, fig. 3 is a deviation sequence diagram of the battery cell 4 and the battery cell 3, fig. 4 is a diagram of upper and lower moments of a deviation sequence made from the deviation sequence data of fig. 3, wherein an abscissa is a deviation at a next moment and an ordinate is a deviation at a previous moment, it can be seen that values of the previous moment and the next moment in the deviation sequence are highly positively correlated, and have a time sequence, and the invention finds out the inconsistent battery cells in the battery pack by using the characteristic.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (3)
1. A method for detecting consistency of battery cells of a battery pack is characterized by comprising the following steps:
s1, acquiring a voltage sequence of each battery cell of a battery pack in a charging and/or discharging process:
wherein, in the step (A),
is a first
The voltage value of the electricity-saving core is taken,
the data volume is obtained;
s2, carrying out data cleaning on the voltage sequence to obtain a cleaned voltage sequence
Wherein, in the process,
is the first after cleaning
The voltage value of the electricity-saving core is taken,
the data volume after cleaning;
s3, calculating a voltage deviation sequence between any two power saving cores:
wherein, in the step (A),
and
represents two different battery cores;
s4, for the voltage deviation sequence
Performing a white noise test if the voltage deviation sequence
If the sequence is white noise sequence, the states of the two power cores are consistent; if voltage deviation sequence
And if the current signal is not a white noise sequence, the states of the two power cores are inconsistent.
2. The method according to claim 1, wherein in step S2, the data is washed into upper and lower threshold values of the set voltage, and error data except the threshold values are removed.
3. The method according to claim 1, wherein in step S4, the white noise test is performed by using one of an autocorrelation chart, a Box-Pierce test, and an Ljung-Box test.
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