CN115832470A - Battery pack leakage detection method and detection system - Google Patents
Battery pack leakage detection method and detection system Download PDFInfo
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Abstract
The application relates to the technical field of battery packs, in particular to a battery pack leakage detection method and a battery pack leakage detection system, wherein the method comprises the following steps: testing VOC values of the battery pack at different temperatures, establishing a coordinate system with the temperature and the VOC values as coordinates, and establishing a standard circle under a first target temperature interval and a target circle under a second target temperature interval in the coordinate system, wherein an intersection area is a non-leakage area, a convergence area is a reference area, and a peripheral area is an outlier escape area; measuring the VOC value of the battery pack to be measured at a second target temperature, thereby obtaining a measuring point taking the value as a coordinate; if the measuring point is in the non-leakage area or the reference area, judging that the battery pack does not leak liquid; and if the measuring point falls in the outlier escape area, calculating to obtain the offset distance of the measuring point relative to the center of the target circle, and comparing the offset distance with a preset value to classify the severity grade. Therefore, compared with the prior art that the threshold value is set blindly, the detection precision is greatly improved.
Description
Technical Field
The application relates to the technical field of battery packs, in particular to a battery pack leakage detection method and a battery pack leakage detection system.
Background
At present, in the process of detecting leakage of a battery pack of a lithium battery/sodium battery, a VOC tester is usually adopted for detection, and a battery pack exceeding a certain VOC value is judged to be an abnormal battery pack by setting a corresponding threshold value, but the threshold value is very difficult to define by experience, and misjudgment are caused by misjudgment and misjudgment due to misjudgment of the threshold value definition, so that repeated work such as secondary confirmation is required.
Disclosure of Invention
The application aims to provide a battery pack leakage detection method and a battery pack leakage detection system, and solves the technical problem that in the prior art, the detection accuracy of battery pack leakage detection is low to a certain extent.
The application provides a battery pack leakage detection method, which comprises the following steps:
testing VOC values of the battery pack at different temperatures, establishing a coordinate system with the temperature and the VOC values as coordinates, and establishing a standard circle in a first target temperature interval and a target circle in a second target temperature interval in the coordinate system;
the target circle is intersected with the standard circle, the intersection area of the target circle and the standard circle is a non-leakage area, the union area of the target circle and the standard circle is a reference area, and the peripheral area of the target circle and the standard circle is an outlier escaping area;
measuring the VOC value of the battery pack to be measured at a second target temperature, thereby obtaining a measuring point taking the value as a coordinate;
if the measuring point is located in the non-leakage area or the reference area, judging that the battery pack does not leak liquid; and if the measuring point falls in the outlier escape area, calculating to obtain the offset distance of the measuring point relative to the center of the target circle, and comparing the offset distance with a preset value according to the offset distance so as to classify the severity grade.
In the above technical solution, further, the center coordinate of the standard circle is (X) 0 ，Y 0 ) The radius of the circle being 3 sigma 0 Wherein X is 0 Is the mean value of the first target temperature interval, Y 0 Is the average value of the VOC corresponding to the first target temperature interval;
the center coordinate of the target circle is (X) 1 ，Y 1 ) Radius of circle of 3 sigma 1 Wherein X is 1 Is the mean value of the second target temperature interval, Y 1 The average value of VOC corresponding to the second target temperature interval;
wherein the content of the first and second substances,
y i the VOC values of the battery pack at different temperatures are shown, mu is the average value of the VOC values of the battery pack at different temperatures, i is a positive integer greater than or equal to 1, and j is an integer greater than or equal to zero.
In any of the above technical solutions, further, the coordinates of the measuring point are (X) n ，Y n ) Wherein X is n Is a second target temperature value, Y n Is the VOC value at this temperature; when the measuring point falls into the outlier escape area, calculating to obtain the offset distance of the measuring point relative to the center of the target circle
If M ≦ M0, determining no risk; if M1 is more than or equal to M0, judging the risk is low; if M2 is more than or equal to M1, judging the risk is high; m > M2 is judged to be out of use; wherein M0 is 2. Sigma j -3σ j (ii) a M1 is 5. Sigma j -6σ j (ii) a M2 is 8 σ j -9σ j (ii) a When X is present n J =0 when located in the first target temperature interval; when X is present n And j =1 in the second target temperature interval.
In any of the above technical solutions, further, when the measurement point falls in the outlier escape area, X is n The smaller the value, Y n The larger the value, the higher the risk of liquid leakage is determined.
In any of the above technical solutions, further, the VOC values of the battery pack at different temperatures are tested, hash tables of the corresponding VOC values at different temperatures are established, and then a coordinate system using the temperature and the VOC values as coordinates is established according to the hash tables.
In any of the above technical solutions, further, in the process of testing the VOC values of the battery pack at different temperatures, after the previous measurement is finished, the battery pack needs to be left standing for a preset time before the next measurement is performed.
In any of the above technical solutions, further, in the process of testing the VOC values of the battery pack at different temperatures, the battery pack is gradually heated to a preset temperature, and is kept at the preset temperature for a preset time, and then the VOC value is detected; and/or
The first target temperature is normal temperature, and the first target temperature interval is a normal temperature interval.
The application also provides a battery pack leakage detection system, which is based on the battery pack leakage detection method of any technical scheme, so that the battery pack leakage detection method has all beneficial technical effects of the battery pack leakage detection method, and is not repeated herein.
In the above technical solution, further, the battery pack leakage detection system includes a test cavity, a VOC measurement instrument, a heating device, and a vacuum extractor; wherein the VOC measurement instrument is disposed within the test cavity; the heating device is used for heating the test cavity, and the vacuumizing device is used for vacuumizing the test cavity.
In any of the above technical solutions, further, the battery pack leakage detection system further includes a temperature detection component for detecting the temperature in the test cavity in real time.
In any of the above technical solutions, further, the battery pack leakage detection system further includes a data acquisition module and a data processing module, the data acquisition module is in communication connection with the VOC measuring instrument and the temperature detection member, and the data processing module is in communication connection with the data acquisition module.
Compared with the prior art, the beneficial effect of this application is:
in the battery pack leakage detection method provided by the application, the standard circle and the target circle are obtained by testing the VOC value of the battery pack at different temperatures, so that different judgment intervals are obtained, and finally, detailed judgment is carried out on test data, and therefore detection precision can be greatly improved after double detection at different temperatures.
In addition, an outlier escape area is obtained, and for a measuring point falling in the outlier escape area, the value of the deviation distance M relative to the center of the target circle is calculated, so that the serious grade can be more effectively classified, and compared with the prior art in which a threshold is set blindly, the detection precision is greatly improved.
Therefore, the state of the battery pack can be analyzed in real time through the established big database, the leakage state of the battery can be detected in real time, and the storage of the battery pack and the safety of the battery pack in use in various scenes are guaranteed.
Based on the method, the battery pack leakage detection system can accurately judge whether the battery pack leaks or not by using the system and combining the method.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a coordinate system with temperature and VOC values as coordinates in an embodiment of the present application;
fig. 2 is another schematic diagram of a coordinate system with temperature and VOC values as coordinates in the embodiment of the present application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.
All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
A method and a system for detecting leakage of a battery pack according to some embodiments of the present application are described below with reference to fig. 1 and 2.
Example one
Referring to fig. 1 and 2, an embodiment of the present application provides a battery pack leakage detection method, including the following steps:
testing VOC values of the battery pack at different temperatures, establishing a coordinate system with the temperature and the VOC values as coordinates, and establishing a standard circle in a first target temperature interval and a target circle in a second target temperature interval in the coordinate system;
the target circle is intersected with the standard circle, the intersection area of the target circle and the standard circle is a non-leakage area, the union area of the target circle and the standard circle is a reference area, and the peripheral area of the target circle and the standard circle is an outlier escape area;
measuring the VOC value of the battery pack to be measured at a second target temperature, thereby obtaining a measuring point taking the value as a coordinate;
if the measuring point is in the liquid leakage-free area or the reference area, judging that the battery pack has no liquid leakage; and if the measuring point falls in the outlier escape area, calculating to obtain the offset distance of the measuring point relative to the center of the target circle, and comparing the offset distance with a preset value to classify the severity grade.
Based on the structure that above describes can know, through the VOC value of test battery package under different temperatures, obtain standard circle and target circle to obtain different judgement intervals, finally carry out detailed judgement to test data, it is thus clear that experience the dual inspection of different temperatures, can promote the detection precision greatly, for example: the battery pack to be detected is subjected to leakage detection at normal temperature, and is detected again along with the temperature rise to a certain preset value, so that the leakage problem which cannot be detected at normal temperature can be effectively avoided, and certainly, in order to further improve the detection temperature, a plurality of different temperature preset values can be additionally set, leakage detection at different temperatures is performed, and a plurality of second target temperature intervals can be set for respective detection.
In addition, for the measuring points falling in the outlier escape area, the deviation distance M value relative to the center of a target circle is calculated, so that the classification of the severity level can be more effectively carried out, and compared with the prior art in which a threshold value is relatively blindly set, the detection precision is greatly improved.
Therefore, the state of the battery pack can be analyzed in real time through the established large database, the leakage state of the battery can be detected in real time, and the storage of the battery pack and the safety of the battery pack under the use of various scenes are guaranteed.
Note that: preferably, the first target temperature is a normal temperature, the first target temperature interval is a normal temperature interval, and the normal temperature falls within the normal temperature interval, and preferably, the normal temperature is a midpoint value of the normal temperature interval or a value close to the midpoint value.
The relationship between the second target temperature interval and the second target temperature is: the second target temperature is a temperature falling within a second target temperature interval, preferably the second target temperature is the midpoint or near the midpoint of the second target temperature interval, for example: if the second target temperature is 50 deg.c, the second target temperature interval may be 45 deg.c-55 deg.c, etc., as just an example.
The detection method is particularly suitable for the leakage detection process of lithium batteries and sodium batteries, and the lithium batteries can be lithium iron phosphate batteries or ternary batteries.
In this embodiment, preferably, as shown in fig. 1, the center coordinates of the standard circle are (X) 0 ，Y 0 ) Radius of circle of 3 sigma 0 Wherein X is 0 Is the mean value of the first target temperature interval, Y 0 Is the average value of VOC corresponding to the first target temperature interval;
the center coordinates of the target circle are (X) 1 ，Y 1 ) The radius of the circle being 3 sigma 1 Wherein X is 1 Is the mean value of the second target temperature interval, Y 1 The average value of VOC corresponding to the second target temperature interval;
wherein the content of the first and second substances,
y i the radius of the standard circle in the first target temperature interval and the radius of the target circle in the second target temperature interval can be calculated according to the formula (the radius j is 0 corresponding to the standard circle, and the radius j is 1 corresponding to the target circle).
In this embodiment, preferably, as shown in fig. 2, the coordinate of the measurement point is (X) n ，Y n ) Wherein X is n Is a second target temperature value, Y n Is the VOC value at this temperature; when the measuring point falls into the outlier escape area, calculating to obtain the relative target of the measuring pointOffset distance of center of circle
If M ≦ M0, determining no risk; if M1 is more than or equal to M0, judging the risk is low; if M2 is more than or equal to M1, judging the high risk; m > M2 is judged to be out of use; wherein M0 is 2 sigma j -3σ j (ii) a M1 is 5. Sigma j -6σ j (ii) a M2 is 8 σ j -9σ j (ii) a When X is present n J =0 when located in the first target temperature interval; when X is present n And j =1 when the temperature is in the second target temperature interval.
According to the description, the danger grade division can be further performed on the measuring points falling into the outlier escape area, the occurrence of misjudgment is avoided, and the detection precision is improved.
Also note that X is the outlier escape zone where the measurement point falls n The smaller the value, Y n The larger the value, the higher the risk of liquid leakage is determined to be.
In this embodiment, preferably, the VOC values of the battery pack at different temperatures are tested, hash tables of the VOC values corresponding to different temperatures are established, and then a coordinate system using the temperature and the VOC values as coordinates is established according to the hash tables.
According to the above description, the corresponding coordinate system can be drawn more intuitively and clearly according to the hash table.
Preferably, the hash table includes a temperature interval, a corresponding temperature mean value of the temperature interval, and a corresponding VOC value in the temperature interval.
In this embodiment, preferably, in the process of testing the VOC values of the battery pack at different temperatures, after the previous measurement is finished, the battery pack needs to be left for a preset time before the next measurement is performed.
According to the above description, the battery pack is kept still before the next measurement, so that the influence of the previous measurement on the next measurement is avoided, and the detection precision is improved.
In this embodiment, preferably, in the process of testing the VOC values of the battery pack at different temperatures, the battery pack is gradually heated to a preset temperature and is kept at the preset temperature for a preset time, and then the VOC value detection is performed. Therefore, the heat preservation is sufficient, the VOC value detection can be carried out within enough time, and the accuracy of the detection result is improved.
In summary, the battery pack leakage detection method provided by the application has the following detailed steps and advantages:
firstly, testing VOC values of a battery pack at different temperatures, and establishing hash tables of the corresponding VOC values at the different temperatures;
secondly, drawing a coordinate system according to the hash table, wherein the abscissa of the coordinate system is temperature, the ordinate of the coordinate system is a VOC value, and a standard circle and a target circle are set up in the coordinate system, as shown in figure 1;
as shown in fig. 1, the dotted line frame is a standard circle C0, and the center coordinates of the standard circle C0 are (X) 0 ，Y 0 )，X 0 Is the mean value of the first target temperature interval, Y 0 The mean value of VOC corresponding to the first target temperature range and the circle radius of 3 sigma 0 B, carrying out the following steps of; the solid line frame is a target circle C1, and the center coordinates of the target circle C1 are (X) 1 ，Y 1 ) X1 is the temperature average value of the second target temperature interval, Y1 is the VOC average value of the corresponding temperature interval, and the circle radius is 3 sigma 1 (ii) a Wherein, according to
Calculate sigma 0 And σ 1 And y is i The VOC values of the battery pack at different temperatures are shown, mu is the average value of the VOC values of the battery pack at different temperatures, N is a positive integer, i is a positive integer greater than or equal to 1, and j is an integer greater than or equal to zero; the intersection of C0 and C1 is a non-leakage region, and the union of C0 and C1 is a reference region, for example, to understand each region: p1, P2 and P3 fall within the outlier escape region and are the corresponding outlier escape points, and P4 is located within the reference region.
The first step and the second step belong to the stage of establishing a database.
Thirdly, starting to detect the battery pack to be detected to obtain a measuring point P n (X n ，Y n ) If measuring point P n Falls in an outlier escape zone, namely a measurement point P n Becomes an outlier escape point, and then calculates the offset distance of the outlier escape point relative to the center coordinates (X1, Y1) of the target circle C1
As shown in fig. 2;
fourthly, classifying the severity grades through the offset distance M value: if M ≦ M0, determining no risk; if M1 is more than or equal to M0, judging the risk is low; if M2 is more than or equal to M1, judging the high risk; m > M2 is judged to be out of use; wherein M0 is 3. Sigma j (ii) a M1 is 6. Sigma j (ii) a M2 is 9 σ j J =0 or 1.
Therefore, the standard circle and the target circle are obtained by testing the VOC values of the battery pack at different temperatures, so that the outlier escape area is obtained, and the serious grade classification can be more effectively performed by calculating the deviation distance M value relative to the center of the target circle for the measuring point falling in the outlier escape area, so that the detection precision is greatly improved.
In the above description, a set of data examples is given, but it is noted that the actual battery pack has many more test data at different temperatures, and because of the large space, the following data are given, specifically, the module of 16V50Ah lithium iron phosphate battery-2P 5S is taken as an example:
table-parameters of the standard circle in the first target temperature interval
Parameters of standard circle in target interval of table two
From the first and second tables, the center coordinates of the standard circle C0 are (23.4, 248.9), and the radius is 3 σ 0＝ 122.4; the center coordinates of the target circle C1 are (35.8, 375.4) and the radius is 3 sigma 1 ＝ A coordinate system is drawn according to the above data, and a standard circle C0 and a target circle C1 are set up in the coordinate system 80. Wherein σ 0 The calculation formula of (a) is as follows:
moreover, σ 1 is also calculated according to the above formula, and will not be described in detail here.
Secondly, carrying out actual detection on the battery pack to be tested to obtain the following data:
table three shows data obtained after detecting the battery pack to be detected, where Test1 is taken as an example:
Example two
An embodiment two of the present application further provides a battery pack leakage detection system, which is based on the battery pack leakage detection method described in the embodiment one, so that all the beneficial technical effects of the battery pack leakage detection method are achieved, and the same technical features and beneficial effects are not repeated.
In this embodiment, preferably, the battery pack leakage detection system includes a test chamber, a VOC measurement instrument, a heating device, and a vacuum extractor; wherein, the VOC measuring instrument is arranged in the test cavity; the heating device is used for heating the testing cavity, and the vacuumizing device is used for vacuumizing the testing cavity.
According to the above description, firstly, the test cavity is vacuumized, then the battery pack is sent into the test cavity, then the temperature of the test cavity is gradually increased and heated to the preset value, namely the second target temperature, then the temperature is kept for the preset time, then the gas in the test cavity is detected by using the VOC measuring instrument, after the detection is completed, the battery pack is taken out, and after the first target temperature is kept still for the preset time, the detection is performed again at a new temperature according to the detection process.
Therefore, whether the battery pack leaks or not can be accurately detected by using the battery pack leakage detection system.
In this embodiment, preferably, the battery pack leakage detection system further includes a temperature detection member for detecting the temperature in the test cavity in real time.
In this embodiment, can monitor the temperature in the test cavity more accurately through the temperature detection component, and then can monitor the temperature of the battery package of position finding in the test cavity more accurately, promote the accuracy nature of testing result.
In this embodiment, preferably, the battery pack leakage detection system further includes a data acquisition module and a data processing module, and the data acquisition module is in communication connection with the VOC measuring instrument, and the data processing module is in communication connection with the data acquisition module.
According to the above description, the temperature value and the VOC value of the battery pack are obtained in real time by the data acquisition module, data are transmitted to the data processing module, the data processing module can prestore the databases established in the first step and the second step, the detection result and the database of the memory are subjected to calculation and analysis, whether the battery pack leaks or not is judged, if the battery pack leaks, the risk level is specifically given, and the precision and the accuracy of the detection result are improved.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A battery pack leakage detection method is characterized by comprising the following steps:
testing VOC values of the battery pack at different temperatures, establishing a coordinate system with the temperature and the VOC values as coordinates, and establishing a standard circle in a first target temperature interval and a target circle in a second target temperature interval in the coordinate system;
the target circle is intersected with the standard circle, the intersection area of the target circle and the standard circle is a non-leakage area, the union area of the target circle and the standard circle is a reference area, and the peripheral area of the target circle and the standard circle is an outlier escaping area;
measuring the VOC value of the battery pack to be measured at a second target temperature, thereby obtaining a measuring point taking the value as a coordinate;
if the measuring point is located in the non-leakage area or the reference area, judging that the battery pack does not leak liquid; and if the measuring point falls in the outlier escape area, calculating to obtain the offset distance of the measuring point relative to the center of the target circle, and comparing the offset distance with a preset value according to the offset distance so as to classify the severity grade.
2. The method of claim 1, wherein the standard circle is roundThe coordinate of the circle center is (X) 0 ，Y 0 ) Radius of circle of 3 sigma 0 Wherein X is 0 Is the mean value of the first target temperature interval, Y 0 Is the average value of VOC corresponding to the first target temperature interval;
the center coordinate of the target circle is (X) 1 ，Y 1 ) Radius of circle of 3 sigma 1 Wherein X is 1 Is the mean value of the second target temperature interval, Y 1 Is the average value of the VOC corresponding to the second target temperature interval;
wherein the content of the first and second substances,
y i the VOC value of the battery pack at different temperatures is shown, mu is the average value of the VOC values of the battery pack at different temperatures, i is a positive integer greater than or equal to 1, and j is an integer greater than or equal to zero.
3. The battery pack leakage detection method according to claim 2, wherein the coordinates of the measurement point are (X) n ，Y n ) Wherein X is n Is a second target temperature value, Y n Is the VOC value at this temperature; when the measuring point falls into the outlier escape area, calculating to obtain the offset distance of the measuring point relative to the center of the target circle
If M ≦ M0, determining no risk; if M1 is more than or equal to M0, judging the risk is low; if M2 is more than or equal to M1, judging the high risk; m > M2 is judged to be out of use; wherein M0 is 2 sigma j -3σ j (ii) a M1 is 5. Sigma j -6σ j (ii) a M2 is 8 σ j -9σ j (ii) a When X is present n J =0 when located in the first target temperature interval; when X is present n And j =1 in the second target temperature interval.
4. The battery pack leakage detection method of claim 3, wherein when the measurement point falls within the outlier escape zone,X n the smaller the value, Y n The larger the value, the higher the risk of liquid leakage is determined.
5. The battery pack leakage detection method according to claim 1, wherein the VOC values of the battery pack at different temperatures are tested, hash tables of the VOC values corresponding to the different temperatures are established, and then a coordinate system with the temperature and the VOC values as coordinates is established according to the hash tables.
6. The method for detecting the leakage of the battery pack according to claim 1, wherein in the process of testing the VOC values of the battery pack at different temperatures, after the previous measurement is finished, the battery pack is required to be placed still for a preset time and then the next measurement is carried out.
7. The battery pack leakage detection method according to any one of claims 1 to 6, wherein in the process of testing the VOC values of the battery pack at different temperatures, the battery pack is gradually heated to a preset temperature, and is kept at the preset temperature for a preset time, and then the VOC value detection is carried out; and/or
The first target temperature is normal temperature, and the first target temperature interval is a normal temperature interval.
8. A battery pack leakage detection system is based on the battery pack leakage detection method of any one of claims 1 to 7, and comprises a test cavity, a VOC measuring instrument, a heating device and a vacuumizing device;
wherein the VOC measurement gauge is disposed within the test cavity; the heating device is used for heating the test cavity, and the vacuumizing device is used for vacuumizing the test cavity.
9. The battery pack leakage detection system of claim 8, further comprising a temperature detection component for detecting the temperature within the test cavity in real time.
10. The battery pack leakage detection system of claim 9, further comprising a data acquisition module and a data processing module, wherein the data acquisition module is in communication with the VOC measurement instrument and the temperature detection member, and the data processing module is in communication with the data acquisition module.
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