Temperature calibration method and temperature calibration tool

Abstract

The invention relates to the technical field of temperature calibration, in particular to a temperature calibration method and a temperature calibration tool. The method comprises the steps of collecting an initial environment temperature; taking the initial environment temperature as a starting point, and generating a plurality of temperature rise target temperatures according to a preset temperature rise step length and a preset number of temperature rise segments; controlling the temperature of the heating plate to rise to each temperature rise target temperature, and collecting the detection temperature output by the temperature detection system and the real temperature of the heating plate under the condition that the temperature rises to the temperature rise target temperature each time; and fitting the detected temperature and the real temperature to obtain a fitting model, and carrying out data calibration on the temperature detection system by adopting the fitting model. According to the method, the calibration model is generated by fitting the detection data and the real data, thermal resistance change of the probe caused by different packaging processes and nonlinear deviation caused by accuracy reduction at high temperature can be accurately calibrated, and the measurement precision of a temperature detection system is improved.

Description

Technical Field

[0001] This application relates to the field of temperature calibration technology, specifically to a temperature calibration method and a temperature calibration fixture. Background Technology

[0002] Batteries are subject to very high temperature requirements during the formation and capacity testing process, as temperature directly affects battery quality and safety during production. Due to long-term use, temperature detection systems may develop deviations, or limitations imposed by the structure and packaging of temperature probes may result in limited contact between the probe's actual detection surface and the battery surface, leading to significant heat loss. This can cause discrepancies between the actual and detected temperatures at high temperatures, resulting in inaccurate temperature measurements. Summary of the Invention

[0003] A temperature calibration method and a temperature calibration fixture are provided to improve the problem of inaccurate temperature measurement in temperature detection systems.

[0004] In a first aspect, embodiments of this application provide a temperature calibration method, comprising:

[0005] Collect the initial ambient temperature;

[0006] Starting from the initial ambient temperature, multiple target temperatures are generated according to a preset temperature rise step size and a preset number of temperature rise segments;

[0007] The heating plate is brought into contact with the temperature probe of the temperature detection system to be calibrated, and the heating plate is controlled to rise to each of the target temperature rises. In each case where the temperature rises to the target temperature rises, the detected temperature output by the temperature detection system and the actual temperature of the heating plate are collected.

[0008] The detected temperature and the actual temperature are fitted to obtain a fitting model, and the fitting model is used to calibrate the temperature detection system.

[0009] In one embodiment of this application, the initial ambient temperature is the ambient temperature of the decomposition and capacity preparation equipment storage location; the collection of the initial ambient temperature includes:

[0010] Collect data from each ambient temperature sensor (106) located in the ambient temperature acquisition area of ​​the decomposition and capacity preparation equipment storage location;

[0011] The average value of all the collected data is determined as the initial ambient temperature.

[0012] In one embodiment of this application, the temperature rise step size ΔT satisfies: 1℃≤ΔT≤~10℃; the number of temperature rise segments N satisfies: 5≤N≤10, where N is a positive integer.

[0013] In one embodiment of this application, collecting the detected temperature of the temperature probe and the actual temperature of the heating plate includes: after a preset time delay, collecting the detected temperature and the actual temperature each time the temperature is raised to the target temperature.

[0014] In one embodiment of this application, the preset duration t satisfies: 30 seconds ≤ t ≤ 60 seconds.

[0015] In one embodiment of this application, fitting the detected temperature and the actual temperature to obtain a fitting model includes:

[0016] The corresponding detected temperature and the actual temperature are formed into a set of data pairs, and multiple sets of data pairs corresponding to the number of temperature rise segments are obtained. The least squares method is used to fit a quadratic polynomial to fit the multiple sets of data pairs to obtain the fitting model.

[0017] Secondly, embodiments of this application provide a temperature calibration fixture, comprising:

[0018] An ambient temperature acquisition module is used to acquire the initial ambient temperature.

[0019] The heating plate is used to contact the temperature probe of the temperature detection system to be calibrated;

[0020] A temperature control module, connected to the heating plate, is used to control the heating plate to heat up to the target temperature according to a preset temperature rise step and a preset number of temperature rise segments.

[0021] A real temperature acquisition device is used to acquire the real temperature of the heating plate each time the heating plate is heated to the target temperature.

[0022] The data processing unit is used to receive the detected temperature and the actual temperature output by the temperature detection system, fit multiple sets of the detected temperature and the actual temperature to obtain a fitting model, and use the fitting model to calibrate the temperature detection system.

[0023] In one embodiment of this application, the ambient temperature acquisition module includes multiple ambient temperature sensors, which are respectively installed in the ambient temperature acquisition area of ​​the formulation and capacity storage device. The initial ambient temperature is the average value of the data collected by each of the ambient temperature sensors.

[0024] In one embodiment of this application, the temperature control module includes a temperature controller and a temperature sensor. The temperature sensor is used to contact the heating plate and collect the real-time temperature of the heating plate. The temperature controller is connected to the heating plate and is used to adjust the output power of the heating plate according to the real-time temperature to control the heating plate to heat up to the target temperature.

[0025] In one embodiment of this application, the real temperature acquisition device includes a real temperature acquisition probe, which abuts against the lower surface of the heating plate, and the temperature probe abuts against the upper surface of the heating plate. The temperature probe and the real temperature acquisition probe are coaxially arranged, and the acquisition accuracy of the real temperature acquisition probe is greater than that of the temperature probe.

[0026] In one embodiment of this application, the temperature acquisition chip inside the temperature probe is vertically arranged, and the real temperature acquisition chip inside the real temperature acquisition probe is horizontally arranged.

[0027] The beneficial effects of this application are: Starting from the initial ambient temperature, this application generates multiple target temperature sequences according to a preset step size, covering the temperature range of lithium battery formation, capacity and operation conditions, so that the calibration data points are evenly distributed within the error range. By fitting the detection data and the real data, a calibration model is generated, which can accurately calibrate the changes in thermal resistance caused by different packaging processes of the probe and the nonlinear deviation caused by the decrease in accuracy at high temperatures, thereby improving the measurement accuracy of the temperature detection system. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic flowchart of a temperature calibration method provided in some embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the temperature calibration fixture provided in some embodiments of this application;

[0031] Figure 3 This is an installation structure diagram of the temperature calibration fixture provided in some embodiments of this application;

[0032] Figure 4 This is a structural diagram of a temperature calibration fixture provided in some embodiments of this application.

[0033] Figure 5 These are structural diagrams of the temperature control mechanism provided in some embodiments of this application;

[0034] Figure 6 This is a cross-sectional view of a temperature control mechanism provided in some embodiments of this application.

[0035] In the attached image:

[0036] 1. Temperature calibration fixture; 101. Ambient temperature acquisition module; 102. Heating plate; 103. Temperature control module; 104. Real temperature acquisition device; 105. Data processing unit; 106. Ambient temperature sensor; 107. Temperature control sensor; 108. Temperature control mechanism; 109. Upper mounting plate; 110. Lower mounting plate; 111. Fixing block; 112. Real temperature acquisition probe; 2. Temperature detection system; 201. Temperature probe; 3. Mechanical unit; 301. Tray; 302. Cylinder. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] On the one hand, this embodiment provides a temperature calibration method, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes the following steps:

[0040] Step S1: Collect the initial ambient temperature of the decomposition and capacity storage device location;

[0041] Step S2: Starting from the initial ambient temperature, generate multiple target temperatures according to the preset temperature rise step size and the preset number of temperature rise segments;

[0042] Step S3: The heating plate 102 is brought into contact with the temperature probe 201 of the temperature detection system 2 to be calibrated, and the heating plate 102 is controlled to rise to each temperature rise target temperature. In addition, the detection temperature output by the temperature detection system 2 and the actual temperature of the heating plate 102 output by the actual temperature acquisition device 104 are collected each time the temperature rises to the target temperature.

[0043] Step S4: Fit the detected temperature and the actual temperature to obtain a fitting model, and use the fitting model to calibrate the temperature detection system 2.

[0044] Specifically, the temperature detection system 2 to be calibrated is connected to the temperature probe 201 as an integrated device for acquiring lithium battery temperature. The temperature probe 201 is used to acquire lithium battery temperature signals, and the temperature detection system 2 is used to collect signals and output data. The temperature detection system 2 can be an independent device or integrated into a host computer. This application uses the initial ambient temperature as a starting point and generates multiple target temperature sequences according to a preset step size, covering the full operating temperature range of lithium battery formation and capacity testing. This ensures that the calibration data points are evenly distributed within the error range. By fitting the detection data and the real data, a calibration model is generated, which can accurately calibrate the nonlinear deviation of the probe caused by changes in packaging thermal resistance and decreased high-temperature sensitivity, thereby improving the measurement accuracy of the temperature detection system 2.

[0045] In one optional embodiment, the initial ambient temperature is the ambient temperature of the formulation and capacity storage area. This application collects the ambient temperature of each area of ​​the formulation and capacity storage area through the ambient temperature acquisition module 101, and then takes the average value of all the collected ambient temperatures. This average value is defined as the initial ambient temperature. For example, there are ambient temperature acquisition areas at the four corners of the formulation and capacity storage area. The ambient temperatures collected by the ambient temperature acquisition module 101 are 25.12℃, 25.18℃, 24.89℃, and 24.81℃, respectively. The calculated initial ambient temperature is 25℃, which can eliminate the influence of local temperature differences in the formulation and capacity storage area and avoid calibration starting point deviation caused by temperature in a single area.

[0046] In one optional embodiment, the lithium battery temperature of this application is between 20°C and 70°C. Depending on the application scenario of the lithium battery temperature to be detected, the temperature rise step size ΔT set in this application satisfies: 1°C ≤ ΔT ≤ ~10°C; the number of temperature rise segments N satisfies: 5 ≤ N ≤ 10, where N is a positive integer.

[0047] In one specific embodiment, this application sets 7 temperature rise segments with a temperature rise step size of 3°C. Based on the initial ambient temperature of 25°C in the above embodiment, the target temperature rise of this application is: 28°C, 31°C, 34°C, 37°C, 40°C, 43°C, and 46°C.

[0048] The host computer sends the target temperature rise to the temperature control module 103, and the temperature control module 103 controls the output power of the heating plate 102 to control the heating plate 102 to rise to the target temperature rise. The temperature control module 103 of this application includes a temperature controller and a temperature control sensor 107. The temperature control sensor 107 collects the temperature of the heating plate 102 in real time. After receiving the temperature collected by the temperature control sensor 107, the temperature controller uses proportional-integral-derivative (PID) control to stabilize the temperature of the heating plate 102 at the target temperature rise.

[0049] In one optional embodiment, acquiring the detected temperature of the temperature probe 201 and the actual temperature of the heating plate 102 includes: after each temperature rise to the target temperature, delaying for a preset time before acquiring the detected temperature and the actual temperature. The preset time t in this application satisfies: 30 seconds ≤ t ≤ 60 seconds. Delaying the acquisition of the detected temperature and the actual temperature after the preset time can eliminate the thermal inertia of the heating plate 102, ensure uniform surface temperature of the heating plate 102, and avoid a temperature difference between the area contacted by the temperature control sensor 107 and the area contacted by the temperature probe 201.

[0050] In one optional embodiment, the corresponding detected temperature and the actual temperature are formed into a set of data pairs to obtain multiple sets of data pairs corresponding to the number of temperature rise segments. The least squares method is used to fit a quadratic polynomial to fit the multiple sets of data pairs to obtain a fitting model.

[0051] Specifically, the heating plate 102 is controlled by the temperature control module 103 to stabilize the temperature rise to the target temperature of the 7-segment temperature rise. The temperature of the heating plate 102 is collected by a high-precision real temperature acquisition device 104 as the real temperature, and the 7 real temperatures are recorded. Taking the above embodiment as an example, the real temperatures are 28.15℃, 31.11℃, 33.82℃, 37.18℃, 39.78℃, 43.11℃, and 46.16℃ respectively.

[0052] The temperature probe 201 of the temperature detection system 2 to be calibrated is used to collect the temperature of the heating plate 102 and obtain 7 detection temperatures. Due to the thermal resistance of the probe package and long-term use deviation, the deviation of the temperature probe 201 is larger in the high temperature range. Therefore, the deviation increases with the increase of temperature. In this embodiment, the deviation of the low temperature range is 1℃~2℃ and the deviation of the high temperature range is 6℃~7℃. The 7 detection temperatures recorded in this embodiment are 27.79℃, 30.25℃, 32.49℃, 35.10℃, 36.73℃, 39.04℃, and 41.02℃.

[0053] More specifically, this application constructs a quadratic polynomial as the fitting model, and the expression of the quadratic polynomial is:

[0054] T c =a(T i ) 2 +bT i +c;

[0055] Among them, T c T represents the actual temperature. i The measured temperature is represented by , and a, b, and c represent coefficients to be solved for, used to compensate for deviations.

[0056] This application uses the least squares method to fit the data, minimizing the sum of squared residuals between the calibration temperature and the standard temperature. The matrix form of the least squares fitted data is as follows:

[0057]

[0058] X in the matrix i The corresponding factor is temperature detection, Y i This corresponds to the actual temperature. This matrix requires calculation of seven key summation terms, namely ∑X i , ∑Y i ,∑X i Y i , N is 7.

[0059] Where ∑X i This represents the sum of all detected temperatures; in this embodiment, the calculated value is 242.42.

[0060] This means that the squares of each detected temperature are summed, and the calculated value in this embodiment is 8530.8116;

[0061] This represents the sum of the cubes of each detected temperature; in this embodiment, the calculated value is 304758.2127.

[0062] This means that each detected temperature is summed up to the fourth power. In this example, the calculated value is 11040183.516.

[0063] ∑Y i This represents the sum of the squares of each actual temperature; in this example, the calculated value is 259.31.

[0064] ∑X i Y i This means that each detected temperature is multiplied by its corresponding actual temperature and then summed. In this example, the calculated value is 9164.2128.

[0065] This means that the square of each detected temperature is multiplied by the corresponding actual temperature and then summed. In this example, the calculated value is 328782.4676.

[0066] Substituting the calculated values ​​into the matrix, we can expand it into three linear equations to solve for a, b, and c.

[0067] First equation: 11040183.516a + 304758.2127b + 8530.8116c = 328782.4676;

[0068] Second equation: 304758.2127a + 8530.8116b + 242.42c = 9164.2128;

[0069] The third equation is: 8530.8116a + 242.42b + 7c = 259.31.

[0070] The above linear equation system can be solved using Gaussian elimination. The specific solution process will not be detailed here. The final coefficients obtained are: quadratic term *a* = 0.03297, linear term *b* = -0.9028, and constant term *c* = 28.13. The final fitted model is as follows:

[0071] T c =0.03297(T) i ) 2 -0.9028T i +28.13;

[0072] This application substitutes the seven sets of detected temperatures with deviations into the fitting model, calculates the fitted values, compares them with the true temperatures, and verifies the deviation after calibration, as shown in Table 1.

[0073] Table 1: Deviation after calibration

[0074] Serial number i Temperature detection Real temperature Fitted values Calibration deviation 1 27.79 28.50 28.15 +0.35 2 30.25 31.00 31.11 -0.11 3 32.49 33.61 33.82 -0.21 4 35.10 37.06 37.18 -0.12 5 36.73 39.46 39.78 -0.31 6 39.04 43.15 43.11 +0.04 7 41.02 46.61 46.16 +0.45

[0075] According to Table 1 above, it can be seen that the deviations after calibration in this application are all within the range of ±0.5℃. Even if the initial detection temperature deviates from the actual temperature by 0.36℃ to 5.14℃, high accuracy can still be achieved through the fitting model of this application, which greatly improves the technical problem of large deviations in high temperature detection.

[0076] like Figure 2 , Figure 3 As shown, this application embodiment also provides a temperature calibration fixture 1 for implementing the temperature calibration method in the above embodiments. The temperature calibration fixture 1 includes:

[0077] Ambient temperature acquisition module 101 is used to acquire the initial ambient temperature;

[0078] The heating plate 102 is used to contact the temperature probe 201 of the temperature detection system 2 to be calibrated;

[0079] Temperature control module 103 is connected to heating plate 102 and is used to control heating plate 102 to heat up to each target temperature according to preset temperature rise step and preset temperature rise segment number.

[0080] The real temperature acquisition device 104 is used to acquire the real temperature of the heating plate 102 each time it is heated to the target temperature.

[0081] The data processing unit 105 is used to receive the detected temperature and the actual temperature output by the temperature detection system 2, fit multiple sets of detected temperatures and actual temperatures to obtain a fitting model, and use the fitting model to calibrate the data of the temperature detection system 2.

[0082] Specifically, the temperature calibration fixture 1 of this application is set on the mechanical unit 3 in the compartment of the formation and capacity testing equipment to calibrate the temperature detection system 2 to be calibrated. The mechanical unit 3 has a tray 301 for placing batteries. During the calibration process, the temperature calibration fixture 1 is placed on the tray 301. Cylinders 302 are provided on both sides of the mechanical unit 3 to drive the tray 301 to move in the vertical direction. In the initial stage, the tray 301 is located at the bottom of the mechanical unit 3. After the temperature calibration fixture 1 is placed on the tray 301, the tray 301 is driven to rise by the cylinders 302, so that the heating plate 102 in the fixture comes into contact with the temperature probe 201 of the temperature detection system 2.

[0083] The data processing unit 105 of this application can be used as a separate module or integrated into the temperature detection system 2 to directly calibrate the temperature detection system 2.

[0084] In one optional embodiment, the ambient temperature acquisition module 101 includes a plurality of ambient temperature sensors 106, which are respectively set on the ambient temperature acquisition area of ​​the formulation and capacity storage device, and the initial ambient temperature is the average value of the data collected by each ambient temperature sensor 106.

[0085] Specifically, the ambient temperature sensor 106 includes a first ambient temperature sensor, a second ambient temperature sensor, a third ambient temperature sensor, and a fourth ambient temperature sensor located in four uniformly dispersed collection areas within the bulking and filling equipment. The initial ambient temperature is obtained by calculating the average value of the ambient temperatures collected by the four ambient temperature sensors 106.

[0086] In one optional embodiment, the temperature control module 103 includes a temperature controller and a temperature sensor 107. The temperature sensor 107 is used to contact the heating plate 102 and collect the real-time temperature of the heating plate 102. The temperature controller is connected to the heating plate 102 and is used to adjust the output power of the heating plate 102 according to the real-time temperature to control the heating plate 102 to heat up to the target temperature.

[0087] Each time the temperature rises to the target temperature, the detected temperature output by the temperature acquisition and detection system 2 and the actual temperature of the heating plate 102 output by the actual temperature acquisition device 104 are collected. The corresponding detected and actual temperatures are paired to obtain multiple sets of data pairs corresponding to the number of temperature rise segments. A least squares method is used to fit a quadratic polynomial to these multiple sets of data pairs, resulting in a fitted model. The specific fitting calculation process of this application is as described in the above embodiment and will not be repeated here.

[0088] Specifically, such as Figure 4 As shown, the temperature calibration fixture 1 of this application has multiple temperature control mechanisms 108, which correspond to multiple temperature probes 201 of the temperature detection system 2 respectively. The temperature control mechanisms 108 are evenly arranged in an array, and each temperature control mechanism 108 has a heating plate 102.

[0089] More specifically, such as Figure 5 As shown, the temperature control mechanism 108 includes an upper mounting plate 109 and a lower mounting plate 110 stacked together. The heating plate 102 is sandwiched between the upper mounting plate 109 and the lower mounting plate 110. A through cavity is formed on the surface of the upper mounting plate 109, and the surface of the heating plate 102 is exposed in the through cavity. During the process of raising the temperature calibration fixture 1, the temperature probe 201 extends into the through cavity to contact the heating plate 102.

[0090] The temperature control mechanism 108 also includes a fixing block 111, which is fixed in the temperature calibration fixture 1.

[0091] The lower mounting plate 110 of this application has a cavity on its surface, and the temperature control sensor 107 is disposed in the cavity. The signal line for the output data of the temperature control sensor 107 and the signal line for controlling the heating plate 102 are both led out from between the upper mounting plate 109 and the lower mounting plate 110.

[0092] Specifically, this application uses a host computer to send the target temperature rise to the temperature control module 103, and the temperature control module 103 controls the output power of the heating plate 102 to control the heating plate 102 to rise to the target temperature rise; the temperature control sensor 107 collects the temperature of the heating plate 102 in real time, and after receiving the temperature collected by the temperature control sensor 107, the temperature controller uses PID control to stabilize the temperature of the heating plate 102 at the target temperature rise.

[0093] In one alternative embodiment, such as Figure 6 As shown, the real temperature acquisition device 104 has a real temperature acquisition probe 112, which abuts against the lower surface of the heating plate 102, and the temperature probe 201 abuts against the upper surface of the heating plate 102. When the temperature probe 201 is in contact with the heating plate 102, the temperature probe 201 and the real temperature acquisition probe 112 are coaxially arranged.

[0094] Specifically, the temperature probe 201 and the actual temperature acquisition probe 112 are set coaxially, which can ensure that the two probes acquire the temperature of the upper and lower surfaces of the heating plate 102 at the same position, thus minimizing the deviation caused by positional differences.

[0095] Specifically, the heating plate 102 of this application has a flat, layered structure with a heat-equalizing layer, such as copper foil or graphite sheet, on its surface to ensure uniform surface temperature. The actual temperature acquisition probe 112 of this application uses a high-precision probe to acquire sufficiently accurate temperature data. The temperature probe 201 uses a PT100 model, while the actual temperature acquisition probe 112 uses a higher-precision model, such as PT1000 or ultra-precision platinum resistance thermometers. Alternatively, the actual temperature acquisition probe 112 can also use a PT100 model, but with a higher precision specification. Furthermore, to ensure service life, insulation, and other reasons, the temperature acquisition chip 2011 of the temperature probe 201 is vertically positioned, while the actual temperature acquisition chip 1121 of the actual temperature acquisition probe 112 of this application is horizontally positioned to increase the contact area with the heating plate 102, and is internally filled with silicone grease to ensure sufficient contact and reduce heat dissipation.

[0096] The above provides a detailed description of a temperature calibration method and temperature calibration fixture provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A temperature calibration method, characterized in that, include: Collect the initial ambient temperature; Starting from the initial ambient temperature, multiple target temperatures are generated according to a preset temperature rise step size and a preset number of temperature rise segments; The heating plate is brought into contact with the temperature probe of the temperature detection system to be calibrated, and the heating plate is controlled to rise to each of the target temperature rises. In each case where the temperature rises to the target temperature rises, the detected temperature output by the temperature detection system and the actual temperature of the heating plate are collected. The detected temperature and the actual temperature are fitted to obtain a fitting model, and the fitting model is used to calibrate the temperature detection system.

2. The temperature calibration method according to claim 1, characterized in that, The initial ambient temperature is the ambient temperature of the decomposition and capacity preparation equipment storage location; the collection of the initial ambient temperature includes: Collect data from each ambient temperature sensor located in the ambient temperature acquisition area of ​​the decomposition and capacity preparation equipment storage area; The average value of all the collected data is determined as the initial ambient temperature.

3. The temperature calibration method according to claim 1, characterized in that, The temperature rise step size ΔT satisfies: 1℃≤ΔT≤10℃; the number of temperature rise segments N satisfies: 5≤N≤10, where N is a positive integer.

4. The temperature calibration method according to claim 1, characterized in that, The temperature detected by the temperature probe and the actual temperature of the heating plate are collected, including: Each time the temperature is raised to the target temperature, the detected temperature and the actual temperature are collected after a preset delay.

5. The temperature calibration method according to claim 4, characterized in that, The preset duration t satisfies: 30 seconds ≤ t ≤ 60 seconds.

6. The temperature calibration method according to claim 1, characterized in that, The detected temperature and the actual temperature are fitted to obtain a fitting model, including: The corresponding detected temperature and the actual temperature are formed into a set of data pairs, and multiple sets of data pairs corresponding to the number of temperature rise segments are obtained. The least squares method is used to fit a quadratic polynomial to fit the multiple sets of data pairs to obtain the fitting model.

7. A temperature calibration fixture, characterized in that, include: An ambient temperature acquisition module is used to acquire the initial ambient temperature. The heating plate is used to contact the temperature probe of the temperature detection system to be calibrated; A temperature control module, connected to the heating plate, is used to control the heating plate to heat up to the target temperature according to a preset temperature rise step and a preset number of temperature rise segments. A real temperature acquisition device is used to acquire the real temperature of the heating plate each time the heating plate is heated to the target temperature. The data processing unit is used to receive the detected temperature and the actual temperature output by the temperature detection system, fit multiple sets of the detected temperature and the actual temperature to obtain a fitting model, and use the fitting model to calibrate the temperature detection system.

8. The temperature calibration fixture according to claim 7, characterized in that, The ambient temperature acquisition module includes multiple ambient temperature sensors, which are respectively installed in the ambient temperature acquisition area of ​​the formulation and capacity storage device. The initial ambient temperature is the average value of the data collected by each of the ambient temperature sensors.

9. The temperature calibration fixture according to claim 7, characterized in that, The temperature control module includes a temperature controller and a temperature sensor. The temperature sensor is used to contact the heating plate and collect the real-time temperature of the heating plate. The temperature controller is connected to the heating plate and is used to adjust the output power of the heating plate according to the real-time temperature to control the heating plate to heat up to the target temperature.

10. The temperature calibration fixture according to claim 7, characterized in that, The real temperature acquisition device has a real temperature acquisition probe, which abuts against the lower surface of the heating plate, while the temperature probe abuts against the upper surface of the heating plate. The temperature probe and the real temperature acquisition probe are coaxially arranged, and the acquisition accuracy of the real temperature acquisition probe is greater than that of the temperature probe.

11. The temperature calibration fixture according to claim 10, characterized in that, The temperature acquisition chip (2011) inside the temperature probe is set vertically, and the real temperature acquisition chip (1121) inside the real temperature acquisition probe is set horizontally.

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