Battery pack liquid leakage detection method and detection system

Abstract

The application relates to the technical field of battery packs, in particular to a battery pack liquid leakage detection method and a detection system. The method comprises the following steps: testing VOC values of a battery pack under different temperatures, establishing a coordinate system with temperature and VOC value as coordinates, 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 the intersection area is an un-leaked liquid area, the union area is a reference area, and the peripheral area is an outlier escape area; under the second target temperature, the VOC value of the battery pack to be detected is measured, so that a measurement point with the above values as coordinates is obtained; if the measurement point falls in the un-leaked liquid area or the reference area, it is judged that the battery pack has not leaked liquid; if the measurement point falls in the outlier escape area, the offset distance of the measurement point relative to the center of the target circle is calculated, and the offset distance is compared with a preset value to perform a serious grade classification. It can be seen that, compared with the relatively blind setting of a threshold value in the prior art, the detection precision is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, in particular to a battery pack liquid leakage detection method and system. BACKGROUND

[0002] At present, in the process of battery pack liquid leakage detection of lithium battery / sodium battery, a VOC tester is usually used for detection, and a certain VOC value is set as a threshold to determine the abnormal battery pack. However, it is very difficult to define the threshold by experience, and unreasonable threshold definition will cause misjudgment and omission, resulting in repeated work such as secondary confirmation. SUMMARY

[0003] The present application aims to provide a battery pack liquid leakage detection method and system, which solves the problem of low detection accuracy of battery pack liquid leakage detection in the prior art to some extent.

[0004] The present application provides a battery pack liquid leakage detection method, which comprises the following steps:

[0005] The VOC value of the test battery pack at different temperatures is measured, a coordinate system with temperature and VOC value as coordinates is established, and a standard circle at a first target temperature interval and a target circle at a second target temperature interval are established in the coordinate system;

[0006] The target circle intersects with the standard circle, the intersection area of the target circle and the standard circle is an un-leaked liquid 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.

[0007] At the second target temperature, the VOC value of the battery pack to be measured is measured, so as to obtain a measurement point with the above values as coordinates;

[0008] If the measurement point falls within the un-leaked liquid area or the reference area, it is determined that the battery pack has not leaked liquid. If the measurement point falls within the outlier escape area, the offset distance of the measurement point relative to the center of the target circle is calculated, and the offset distance is compared with a preset value to classify the severity.

[0009] In the above technical solution, further, the center coordinates of the standard circle are (X0, Y0), and the radius is 3σ0, wherein X0 is the average value of the first target temperature interval, and Y0 is the average VOC value corresponding to the first target temperature interval.

[0010] The center coordinates of the target circle are (X1, Y1), and the radius is 3σ1, wherein X1 is the average value of the second target temperature interval, and Y1 is the average VOC value corresponding to the second target temperature interval.

[0011] wherein, y i is the VOC value of the battery pack at different temperatures, μ is the average value of the VOC value 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.

[0012] In any of the above technical solutions, further, the coordinates of the measurement point are (X n , Y n ), wherein X n is a second target temperature value, and Y n is a VOC value at this temperature; when the measurement point falls within the outlier escape area, the offset distance of the measurement point relative to the center of the target circle is calculated as

[0013] If M≦M0, it is determined to be risk-free; if M1≥M>M0, it is determined to be low risk; if M2≥M>M1, it is determined to be high risk; and M>M2 is determined to stop using; wherein M0 is 2σ j -3σ j ; M1 is 5σ j -6σ j ; M2 is 8σ j -9σ j ; when X n is located in the first target temperature interval, j=0; and when X n is located in the second target temperature interval, j=1.

[0014] In any of the above technical solutions, further, when the measurement point falls within the outlier escape area, the smaller the value of X n , the larger the value of Y n , and the higher the risk of liquid leakage is determined.

[0015] In any of the above technical solutions, further, the VOC values of the battery pack at different temperatures are tested, a hash table of the corresponding VOC values at different temperatures is established, and a coordinate system with temperature and VOC value as coordinates is established according to the hash table.

[0016] In any of the above technical solutions, further, during the process of testing the VOC values of the battery pack at different temperatures, after the end of the previous measurement, the battery pack needs to be rested for a preset time before the next measurement.

[0017] In any of the above technical solutions, further, during 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

[0018] The first target temperature is room temperature, and the first target temperature range is a room temperature range.

[0019] The application also provides a battery pack liquid leakage detection system based on the battery pack liquid leakage detection method in any of the above technical solutions, and thus has all the beneficial technical effects of the battery pack liquid leakage detection method, which will not be described here.

[0020] In the above technical solution, further, the battery pack liquid leakage detection system comprises a test cavity, a VOC measuring instrument, a heating device, and a vacuum pumping device; the VOC measuring instrument is arranged in the test cavity; the heating device is used to heat the test cavity, and the vacuum pumping device is used to pump the test cavity.

[0021] In any of the above technical solutions, further, the battery pack liquid leakage detection system further comprises a temperature detection member for detecting the temperature in the test cavity in real time.

[0022] In any of the above technical solutions, further, the battery pack liquid leakage detection system further comprises 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 temperature detection member, and the data processing module is in communication connection with the data acquisition module.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] In the battery pack liquid leakage detection method provided by the application, the VOC values of the battery pack at different temperatures are tested, a standard circle and a target circle are obtained, different judgment ranges are obtained, and finally the test data is judged in detail. It can be seen that the detection accuracy can be greatly improved through double inspection at different temperatures.

[0025] In addition, the outlier escape area is obtained, for the measurement points falling in the outlier escape area, the deviation distance M value of the center of the target circle is calculated, and the classification of the severity level can be more effectively performed, which greatly improves the detection accuracy compared with the relatively blind setting of the threshold value in the prior art.

[0026] It can be seen that the large database established can analyze the state of the battery pack in real time, detect the battery leakage state in real time, and ensure the safety of the battery pack storage and use in various scenes.

[0027] The battery pack liquid leakage detection system provided by the application is based on the above method, and can accurately determine whether the battery pack leaks liquid by using the system and combining the above method. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without making creative efforts on the basis of these drawings.

[0029] Figure 1 A schematic view of a coordinate system with temperature and VOC value as coordinates in an embodiment of the present application;

[0030] Figure 2 Another schematic view of a coordinate system with temperature and VOC value as coordinates in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, not all embodiments of the present application.

[0032] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0033] Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for description purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0036] The application will be described below with reference to Figure 1 and Figure 2 The application provides a battery pack leakage detection method and a detection system.

[0037] Embodiment one

[0038] Referring to Figure 1 and Figure 2 The application provides a battery pack leakage detection method, comprising the following steps:

[0039] Test the VOC value of the battery pack at different temperatures, establish a coordinate system with temperature and VOC value as coordinates, and establish a standard circle at a first target temperature interval and a target circle at a second target temperature interval in the coordinate system;

[0040] The target circle intersects with the standard circle, the intersection area of the target circle and the standard circle is an un-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;

[0041] At the second target temperature, measure the VOC value of the battery pack to be tested, so as to obtain a measurement point with the above values as coordinates;

[0042] If the measurement point falls within the un-leakage area or the reference area, it is judged that the battery pack has not leaked; if the measurement point falls within the outlier escape area, the offset distance of the measurement point relative to the center of the target circle is calculated, and the offset distance is compared with a preset value, so as to classify the severity.

[0043] Based on the above-described structure, by testing the VOC value of the battery pack at different temperatures, the standard circle and the target circle are obtained, so as to obtain different judgment intervals, and finally the test data is judged in detail. It can be seen that, after experiencing double inspection at different temperatures, the detection accuracy can be greatly improved. For example, the battery pack to be tested is detected for leakage at room temperature, and then detected again after the temperature rises to a certain preset value. This can effectively avoid the problem of undetectable leakage at room temperature. Of course, in order to further improve the detection temperature, several different temperature preset values can be set for leakage detection at different temperatures, that is, a plurality of second target temperature intervals can be set for separate detection.

[0044] In addition, for the measurement point falling in the outlier escape area, the deviation distance M value relative to the center of the target circle is calculated, so that the severity classification can be more effectively performed. Compared with the relative blind setting of threshold value in the prior art, the detection accuracy is greatly improved.

[0045] It can be seen that the established large database can analyze the state of the battery pack in real time, detect the battery leakage state in real time, and ensure the safety of the battery pack in storage and various scenes.

[0046] Note: Preferably, the first target temperature is room temperature, and the first target temperature interval is a room temperature interval, and the room temperature falls within the room temperature interval, and preferably, the room temperature is the midpoint value or a value close to the midpoint of the room temperature interval. Of course, the first target temperature and the first target temperature interval are not limited to the above, and other temperatures and intervals can also be selected.

[0047] The relationship between the aforementioned second target temperature interval and the second target temperature is that the second target temperature falls within the second target temperature interval, and preferably, the second target temperature is the midpoint value or a value close to the midpoint of the second target temperature interval. For example, if the second target temperature is 50℃, the second target temperature interval can be 45℃-55℃, etc. This is only an example.

[0048] The above detection method is particularly applicable to the leakage detection process of lithium batteries and sodium batteries, and the lithium battery can be a lithium iron phosphate battery or a ternary battery.

[0049] In this embodiment, preferably, as shown in Figure 1 , the center coordinates of the standard circle are (X0, Y0), and the radius of the circle is 3σ0, where X0 is the mean value of the first target temperature interval, and Y0 is the average VOC value corresponding to the first target temperature interval.

[0050] The center coordinates of the target circle are (X1, Y1), and the radius of the circle is 3σ1, where X1 is the mean value of the second target temperature interval, and Y1 is the average VOC value corresponding to the second target temperature interval.

[0051] wherein, y i is the VOC value of the battery pack at different temperatures, μ is the average value of the VOC value 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 radius of the standard circle under the first target temperature interval and the target circle under the second target temperature interval can be calculated according to the above formula (j=0 corresponds to the standard circle described above, and j=1 corresponds to the target circle described above).

[0052] In this embodiment, preferably, as shown in Figure 2 , the coordinates of the measurement point are (X n , Y n ), where X n is the second target temperature value, and Y n is the VOC value at this temperature; when the measurement point falls within the outlier escape area, the offset distance of the measurement point relative to the center of the target circle is calculated

[0053] If M≦M0, it is determined as no risk; if M1≥M>M0, it is determined as low risk; if M2≥M>M1, it is determined as high risk; M>M2 is determined as stop using; wherein M0 is 2σ j -3σ j ; M1 is 5σ j -6σ j ; M2 is 8σ j -9σ j ; when X n is located in the first target temperature interval, j=0; when X n is located in the second target temperature interval, j=1.

[0054] According to the above description, for the measurement point falling into the outlier escape area, further risk level division can be performed to avoid misjudgment and improve detection accuracy.

[0055] Moreover, it is noted that when the measurement point falls in the outlier escape area, the smaller the value of X n , the larger the value of Y n , and the higher the risk of liquid leakage.

[0056] In this embodiment, preferably, the VOC values of the test battery pack at different temperatures are established, a hash table of the VOC values corresponding to different temperatures is established, and a coordinate system with temperature and VOC value as coordinates is established according to the hash table.

[0057] According to the above description, the corresponding coordinate system can be more intuitively and clearly drawn according to the hash table.

[0058] 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.

[0059] In this embodiment, preferably, during the process of testing the VOC values of the battery pack at different temperatures, after the previous measurement is completed, the battery pack needs to be rested for a preset time before the next measurement.

[0060] According to the above description, the battery pack is rested before the next measurement to avoid the influence of the previous measurement on the next measurement, thereby helping to improve the detection accuracy.

[0061] In this embodiment, preferably, during 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 before the VOC value detection. It can be seen that sufficient heat preservation can give sufficient time for VOC value detection, thereby improving the accuracy of the detection result.

[0062] In summary, the battery pack liquid leakage detection method provided by the application has the following detailed steps and advantages:

[0063] The first step is to test the VOC values of the battery pack at different temperatures, and to establish a hash table of the VOC values corresponding to different temperatures;

[0064]

[0065] The second step is to draw a coordinate system according to the hash table, with the horizontal coordinate of the coordinate system being the temperature and the vertical coordinate being the VOC value, and to establish a standard circle and a target circle in the coordinate system, as shown in Figure 1 .

[0066] As shown in Figure 1 , the dashed box is the standard circle C0, the center coordinates of the standard circle C0 are (X0, Y0), X0 is the average of the first target temperature interval, Y0 is the average VOC value corresponding to the first target temperature interval, and the circle radius is 3σ0; the solid box is the target circle C1, the center coordinates of the target circle C1 are (X1, Y1), X1 is the average temperature of the second target temperature interval, Y1 is the average VOC value corresponding to the temperature interval, and the circle radius is 3σ1; wherein σ0 and σ1 are calculated according to , and y i is the VOC value of the battery pack at different temperatures, μ is the average value of the VOC value 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 the non-leakage area, the union of C0 and C1 is the reference area, and examples are used to understand the regions: P1, P2 and P3 fall in the outlier escape area, and are the corresponding outlier escape points, and P4 is located in the reference area.

[0067] The first and second steps above belong to the database establishment stage.

[0068] The third step is to start detecting the battery pack to be tested, and obtain the measurement point P n (X n , Y n ); if the measurement point P n falls in the outlier escape area, that is, the measurement point P n becomes an outlier escape point, and then the offset distance M of the outlier escape point relative to the center coordinates (X1, Y1) of the target circle C1 is calculated , as shown in Figure 2 .

[0069] The fourth step is to classify the severity level by the offset distance M value: if M≦M0, it is determined to be risk-free; if M1≥M>M0, it is determined to be low-risk; if M2≥M>M1, it is determined to be high-risk; and M>M2 is determined to be stopped using; wherein M0 is 3σ j ; M1 is 6σj ; M2 is 9σ j , j = 0 or 1.

[0070] It can be seen that by testing the VOC value of the battery pack at different temperatures, the standard circle and the target circle are obtained, and the outlier escape area is obtained. For the measurement points falling in the outlier escape area, the deviation distance M value of the center of the target circle is calculated, and then the classification of the severity level can be more effectively performed, and the detection accuracy is greatly improved.

[0071] In combination with the above, a group of data examples are given for illustration, but it should be noted that the actual test data of the battery pack at different temperatures is much more than this. Due to the large size, only the following data is given for illustration. Specifically, the 16V50Ah lithium iron phosphate battery-2P5S module is taken as an example:

[0072] Table 1: Parameters of the standard circle under the first target temperature interval

[0073]

[0074]

[0075] Table 2: Parameters of the standard circle under the target interval

[0076]

[0077] From Table 1 and Table 2, it can be obtained that the center coordinates of the standard circle C0 are (23.4, 248.9), and the radius is 3σ 0＝ 122.4; the center coordinates of the target circle C1 are (35.8, 375.4), and the radius is 3σ1 ＝ 80, the coordinate system is drawn according to the above data, and the standard circle C0 and the target circle C1 are established in the coordinate system. The calculation formula of σ0 is as follows:

[0078]

[0079]

[0080] In addition, σ1 is also calculated according to the above formula, which will not be described in detail here.

[0081] Secondly, the actual detection of the battery pack to be tested is carried out, and the following data is obtained:

[0082]

[0083] Table 3: Data obtained after detection of the battery pack to be detected, wherein Test1 is taken as an example:

[0084] The M values of the remaining groups are calculated according to the formula, which is not described in detail here. Note: the units of the temperatures involved in the foregoing are °C, and the units of the VOC values are ppb; j = 0 for σ j in Test 1 to Test 4; j = 1 for σ j in Test 5 and Test 6.

[0085] Embodiment Two

[0086] Embodiment Two of the present application also provides a battery pack liquid leakage detection system based on the battery pack liquid leakage detection method described in Embodiment One above, and thus has all the beneficial technical effects of the battery pack liquid leakage detection method. The same technical features and beneficial effects will not be described again.

[0087] In this embodiment, preferably, the battery pack liquid leakage detection system comprises a test cavity, a VOC measuring instrument, a heating device, and a vacuum pumping device; the VOC measuring instrument is arranged in the test cavity; the heating device is used to heat the test cavity, and the vacuum pumping device is used to pump the test cavity.

[0088] According to the above description, first, the test cavity is pumped to vacuum, then the battery pack is sent into the test cavity, then the test cavity is gradually heated to a preset value, i.e., the second target temperature described above, then the temperature is kept for a preset time, then the VOC measuring instrument is used to detect the gas in the test cavity, after the detection is completed, the battery pack is taken out, and after being stored at the first target temperature for a preset time, the detection process is performed again at a new temperature.

[0089] As can be seen, the battery pack liquid leakage detection system can accurately detect whether the battery pack leaks liquid.

[0090] In this embodiment, preferably, the battery pack liquid leakage detection system further comprises a temperature detection member for detecting the temperature in the test cavity in real time.

[0091] In this embodiment, the temperature detection member can more accurately monitor the temperature in the test cavity, and thus can more accurately monitor the temperature of the battery pack in the test cavity, improving the accuracy of the detection results.

[0092] In this embodiment, preferably, the battery pack liquid leakage detection system further comprises 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.

[0093] According to the above description, the temperature value and the VOC value of the battery pack are acquired in real time by using the data acquisition module, and the data are transmitted to the data processing module. The data processing module can pre-store the database established in the aforementioned steps one and two, calculate and analyze the aforementioned detection result and the database in the memory, and further determine whether the battery pack leaks liquid. If the battery pack leaks liquid, a risk level is specifically given, and the accuracy and precision of the detection result are improved.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting battery pack leakage, characterized in that, Includes the following steps: Test the VOC value of the battery pack at different temperatures, establish a coordinate system with temperature and VOC values ​​as coordinates, and establish a standard circle under the first target temperature range and a target circle under the second target temperature range within the coordinate system; Wherein, the target circle intersects with the standard circle, the intersection area of ​​the target circle and the standard circle is the non-leakage area, the union area of ​​the target circle and the standard circle is the reference area, and the outer area of ​​the target circle and the standard circle is the outlier escape area. At the second target temperature, the VOC value of the battery pack under test is measured to obtain the measurement points with the above values ​​as coordinates; If the measurement point falls within the non-leakage zone or the reference zone, the battery pack is determined to be non-leakage; if the measurement point falls within the outlier escape zone, the offset distance of the measurement point relative to the center of the target circle is calculated, and the severity level is classified based on the offset distance compared with a preset value. The center coordinates of the standard circle are (X0, Y0), and the radius of the circle is 3σ0, where X0 is the mean of the first target temperature range, and Y0 is the average VOC value corresponding to the first target temperature range. The center coordinates of the target circle are (X1, Y1), and the radius of the circle is 3σ1, where X1 is the mean value of the second target temperature range, and Y1 is the average value of VOC in the corresponding second target temperature range. Where, σ j = y i Let be the VOC value of the battery pack at different temperatures, µ be the average VOC value of the battery pack at different temperatures, i be a positive integer greater than or equal to 1, and j be an integer greater than or equal to zero. The coordinates of the measurement point are (X) n Y n ), where X n Y is the second target temperature value. n The VOC value at this temperature; when the measurement point falls within the outlier escape zone, the offset distance M of the measurement point relative to the center of the target circle is calculated. ; If M≦M0, it is considered risk-free; if M1≥M>M0, it is considered low-risk; if M2≥M>M1, it is considered high-risk; if M>M2, it is considered discontinued; where M0 is 2σ j -3σ j M1 is 5σ j -6σ j M2 is 8σ j -9σ j When X n When the temperature is within the first target temperature range, j=0; when X n When the temperature is within the second target temperature range, j=1.

2. The battery pack leakage detection method according to claim 1, characterized in that, When the measurement point falls within the outlier escape zone, X n The smaller the value, the better. n The higher the value, the higher the risk of leakage.

3. The battery pack leakage detection method according to claim 1, characterized in that, Test the VOC value of the battery pack at different temperatures, establish a hash table of VOC values ​​corresponding to different temperatures, and then establish a coordinate system with temperature and VOC values ​​as coordinates based on the hash table.

4. The battery pack leakage detection method according to claim 1, characterized in that, During the testing of the VOC value of the battery pack at different temperatures, after the previous measurement is completed, the battery pack needs to be left to stand for a preset time before the next measurement is performed.

5. The battery pack leakage detection method according to any one of claims 1 to 4, characterized in that, During the testing of the VOC value of the battery pack at different temperatures, the battery pack is gradually heated to a preset temperature and held at that temperature for a preset time before VOC value detection is performed; and / or The first target temperature is room temperature, and the first target temperature range is the room temperature range.

6. A battery pack leakage detection system, characterized in that, The battery pack leakage detection method based on any one of claims 1 to 5, wherein the battery pack leakage detection system includes a test chamber, a VOC meter, a heating device, and a vacuum device; The VOC measuring instrument is installed inside the test chamber; the heating device is used to heat the test chamber, and the vacuum device is used to evacuate the test chamber.

7. The battery pack leakage detection system according to claim 6, characterized in that, The battery pack leakage detection system also includes a temperature detection component for real-time detection of the temperature inside the test chamber.

8. The battery pack leakage detection system according to claim 7, characterized in that, The battery pack leakage detection system further includes a data acquisition module and a data processing module. The data acquisition module is communicatively connected to the VOC measuring instrument and the temperature detection component, and the data processing module is communicatively connected to the data acquisition module.

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