Aging state determination method, apparatus, device, medium, and product

Abstract

The application discloses an aging state determination method, device, equipment, medium and product, and belongs to the technical field of high polymer materials. In the embodiment, a mapping relationship between the insulation volume resistivity and the relaxation enthalpy of the high polymer material under different aging states is established, and the correlation between the insulation volume resistivity and the relaxation enthalpy of the high polymer material in the aging process is revealed. According to the mapping relationship, the insulation performance of the high polymer material to be measured can be indirectly obtained in combination with the relaxation enthalpy of the high polymer material to be measured, and the insulation performance of the high polymer material to be measured does not need to be directly measured, so that the problem that the insulation performance of the high polymer material to be measured cannot be accurately measured due to the application of the high polymer material to be measured to specific products can be effectively solved, and then the aging state of the high polymer material to be measured can be accurately determined, and a theoretical basis and technical support are provided for safe operation and maintenance of related equipment.

Description

Technical Field

[0001] This application relates to the field of polymer materials technology, and in particular to a method, apparatus, equipment, medium and product for determining aging state. Background Technology

[0002] Polymer materials are widely used in electrical and electronic fields due to their excellent mechanical, insulating, and heat-resistant properties. However, in practical use, polymer materials are inevitably affected by various environmental factors, leading to aging. These aging phenomena not only affect the performance of polymer materials but also limit their application in electrical and electronic fields.

[0003] Insulation performance is an important indicator for assessing the aging state of polymer materials. However, since these polymer materials are usually used in specific products, it is impossible to accurately measure their insulation performance, and thus impossible to accurately assess their aging state. Summary of the Invention

[0004] This application provides a method, apparatus, equipment, medium, and product for determining aging state, which can accurately determine the insulation performance of the polymer material to be tested, and thus accurately assess its aging state, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0005] In a first aspect, embodiments of this application provide a method for determining the aging state of a polymer material, including:

[0006] Obtain the first relaxation enthalpy of the polymer material to be tested;

[0007] The first insulating volume resistivity of the polymer material to be tested is determined based on the first relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states.

[0008] The aging state of the polymer material to be tested is determined based on the first insulating volume resistivity.

[0009] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the polymer material under test, the insulation performance of the polymer material under test can be indirectly obtained without directly measuring its insulation performance. This effectively solves the problem of inaccurate measurement of the insulation performance of the polymer material under test due to its application in specific products. Furthermore, it allows for accurate determination of the aging state of the polymer material under test, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0010] In some embodiments, the method further includes:

[0011] The performance parameters of the polymer material sample after aging under N different aging conditions are obtained, where N is an integer greater than 1. The performance parameters include the second relaxation enthalpy and the second insulating volume resistivity. The material of the polymer material sample is the same as that of the polymer material to be tested.

[0012] The first mapping relationship is obtained by fitting the relationship based on the corresponding second relaxation enthalpy and second insulating volume resistivity.

[0013] In this embodiment, based on the aged polymer material sample, the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material can be established. This relationship clarifies the correlation between the thermodynamic and electrical parameters of the polymer material, reveals the microscopic mechanism of the change in the insulating performance of the polymer material after aging, and can not only quickly and accurately determine the insulating volume resistivity of the polymer material to be tested, but also provide guidance for the replacement of electrical and electronic equipment, and provide theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0014] In some embodiments, the N different aging conditions include standing at a target temperature for N different durations, the target temperature being determined based on the glass transition temperature of the polymer material sample.

[0015] In this embodiment, the aging temperatures corresponding to the N aging conditions are all the same, only the aging time is different. This can reduce the influence of different aging temperatures, weights and other conditions on the aging state, and make the performance parameters of the material under different aging conditions more meaningful and valuable.

[0016] In some embodiments, obtaining the performance parameters of a polymer material sample after aging under N different aging conditions includes:

[0017] M polymer material samples are selected from N polymer material samples. <N;

[0018] Based on the performance parameters and aging time of M polymer material samples, a relationship fitting was performed to obtain the second mapping relationship between the performance parameters of polymer materials and the aging time.

[0019] Based on the second mapping relationship, determine the performance parameters of the other material samples among the N polymer material samples, excluding the M polymer material samples.

[0020] In this embodiment, the performance parameters and aging time of some polymer material samples are first fitted to obtain a second mapping relationship between the performance parameters of the polymer material and the aging time. Based on the second mapping relationship, the performance parameters of other polymer material samples under different aging times can be determined simply and quickly. Thus, the first mapping relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material can be obtained quickly, and the aging state of the polymer material to be tested can be evaluated quickly.

[0021] In some embodiments, obtaining the first relaxation enthalpy of the polymer material to be tested includes:

[0022] The temperature control parameters of the thermal analyzer are determined based on the material characteristics of the polymer material to be tested. The temperature control parameters include the heating rate and temperature range of the thermal analyzer.

[0023] Thermal analysis was performed on the polymer material under test based on the temperature control parameters to obtain the heat flow curve of the polymer material under test.

[0024] The first relaxation enthalpy of the polymer material under test is determined based on the glass transition temperature corresponding to the heat flow curve.

[0025] In this embodiment, the temperature control parameters of the thermal analyzer are determined based on the material characteristics of the polymer material to be tested, such as its material type and weight. This improves the accuracy of the temperature control parameters, resulting in a more accurate heat flow curve when performing thermal analysis on the polymer material to be tested using these parameters. Consequently, the relaxation enthalpy of the polymer material to be tested can be determined more accurately.

[0026] In some embodiments, aging status includes aging level;

[0027] Based on the first insulating volume resistivity, the aging state of the polymer material to be tested is determined, including:

[0028] The aging level of the polymer material to be tested is determined based on the first insulation volume resistivity and the third mapping relationship.

[0029] The third mapping relationship is used to characterize the relationship between different insulating volume resistivity and aging level of polymer materials.

[0030] In this embodiment, based on the mapping relationship between insulation volume resistivity and aging level, and combined with the insulation volume resistivity of the polymer material to be tested, the aging level of the polymer material to be tested can be obtained. By using the aging level to assess its aging state, users can more intuitively understand the aging state of the polymer material to be tested, providing a guiding theoretical basis for the selection strategy of polymer materials in electrical equipment and electronic components, and providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0031] In some embodiments, after determining the aging state of the polymer material to be tested based on a first insulating volume resistivity, the method further includes:

[0032] If the first insulation volume resistivity is greater than the insulation volume resistivity threshold, an early warning message is output. The early warning message includes at least one of the following: the first insulation volume resistivity of the polymer material to be tested, the first relaxation enthalpy, the aging state, and the carrier supporting the polymer material to be tested.

[0033] In this embodiment, based on the early warning information, relevant personnel can fully understand the specific situation of the polymer material to be tested and quickly locate the specific carrier, providing theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0034] Secondly, embodiments of this application provide a method for determining the aging state of a battery cell casing, wherein the battery cell casing is made of a polymer material, and the method includes:

[0035] Obtain the third relaxation enthalpy of the shell;

[0036] The third insulating volume resistivity of the shell is determined based on the third relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states.

[0037] The aging state of the casing is determined based on the third insulation volume resistivity.

[0038] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the battery cell casing, the insulation performance of the battery cell casing can be indirectly obtained without directly measuring the casing's insulation performance. This effectively solves the problem of inaccurate measurement of insulation performance caused by the application of polymer materials in the battery cell casing, and thus allows for accurate determination of the aging state of the battery cell casing, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0039] Thirdly, embodiments of this application provide an apparatus for determining the aging state of polymer materials, comprising:

[0040] The acquisition module is used to acquire the first relaxation enthalpy of the polymer material to be tested;

[0041] The determination module is used to determine the first insulating volume resistivity of the polymer material to be tested based on the first relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states; and the aging state of the polymer material to be tested is determined based on the first insulating volume resistivity.

[0042] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the polymer material under test, the insulation performance of the polymer material under test can be indirectly obtained without directly measuring its insulation performance. This effectively solves the problem of inaccurate measurement of the insulation performance of the polymer material under test due to its application in specific products. Furthermore, it allows for accurate determination of the aging state of the polymer material under test, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0043] Fourthly, embodiments of this application provide an apparatus for determining the aging state of a battery cell casing, wherein the casing of the battery cell is made of a polymer material, and the apparatus includes:

[0044] The acquisition module is used to acquire the third relaxation enthalpy of the shell;

[0045] The determination module is used to determine the third insulating volume resistivity of the shell based on the third relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states; and the aging state of the shell is determined based on the third insulating volume resistivity.

[0046] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the battery cell casing, the insulation performance of the battery cell casing can be indirectly obtained without directly measuring the casing's insulation performance. This effectively solves the problem of inaccurate measurement of insulation performance caused by the application of polymer materials in the battery cell casing, and thus allows for accurate determination of the aging state of the battery cell casing, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0047] Fifthly, embodiments of this application provide an electronic device, including a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the method for determining the aging state of polymer materials as described in the first aspect, or the steps of the method for determining the aging state of a battery cell casing as described in the second aspect.

[0048] In a sixth aspect, embodiments of this application provide a readable storage medium storing a program or instructions, which, when executed by a processor, implement the steps of the method for determining the aging state of polymer materials as described in the first aspect, or the method for determining the aging state of a battery cell casing as described in the second aspect.

[0049] In a seventh aspect, embodiments of this application provide a computer program product in which instructions, when executed by a processor of an electronic device, cause the electronic device to perform the steps of the method for determining the aging state of polymer materials as described in the first aspect, or the steps of the method for determining the aging state of a battery cell casing as described in the second aspect.

[0050] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0052] Figure 1 One of the flowcharts for a method to determine the aging state of a polymer material provided in some embodiments of this application;

[0053] Figure 2 A second schematic flowchart illustrating a method for determining the aging state of a polymer material, provided for some embodiments of this application;

[0054] Figure 3 A schematic diagram showing the relationship between the second relaxation enthalpy and the second insulating volume resistivity of a PC material under different aging states, provided for some embodiments of this application;

[0055] Figure 4 This is the third flowchart illustrating a method for determining the aging state of a polymer material, provided for some embodiments of this application.

[0056] Figure 5 A schematic diagram illustrating the fitting relationship between the relaxation enthalpy and aging time of a PC material under partial aging time, provided for some embodiments of this application;

[0057] Figure 6A schematic diagram illustrating the fitting relationship between the insulation volume resistivity of a PC material and the aging time at a certain aging time, provided for some embodiments of this application;

[0058] Figure 7 A fourth schematic flowchart illustrating a method for determining the aging state of a polymer material, provided for some embodiments of this application;

[0059] Figure 8 A flowchart illustrating a method for determining the aging state of a battery cell casing, provided for some embodiments of this application;

[0060] Figure 9 A schematic diagram of the structure of an aging state determination device for polymer materials provided in some embodiments of this application;

[0061] Figure 10 A schematic diagram of a device for determining the aging state of a battery cell casing provided in some embodiments of this application;

[0062] Figure 11 This is a schematic diagram of the structure of an electronic device provided in some embodiments of this application. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0068] As mentioned in the background section, polymer materials are widely used in electrical and electronic fields due to their excellent mechanical, insulating, and heat-resistant properties. However, in practical use, polymer materials are inevitably affected by various environmental factors, leading to aging. These aging phenomena not only affect the performance of polymer materials but also limit their application in electrical and electronic fields.

[0069] Insulation performance is an important indicator for assessing the aging state of polymer materials. However, since these polymer materials are usually used in specific products, it is impossible to accurately measure their insulation performance, and thus impossible to accurately assess their aging state.

[0070] In order to accurately determine the insulation performance of polymer materials and thus accurately assess the aging state of polymer materials, embodiments of this application provide a method, apparatus, equipment, medium, and product for determining aging state.

[0071] The method for determining the aging state of polymer materials provided in this application will be described below with reference to the accompanying drawings and specific embodiments.

[0072] Figure 1 This is one of the flowcharts illustrating a method for determining the aging state of a polymer material, provided in some embodiments of this application. This method can be applied to an aging state determination apparatus.

[0073] like Figure 1 As shown, the aging state determination method may include the following steps S110-S130.

[0074] S110, Obtain the first relaxation enthalpy of the polymer material to be tested.

[0075] S120. Determine the first insulating volume resistivity of the polymer material to be tested based on the first relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states.

[0076] S130. Determine the aging state of the polymer material to be tested based on the first insulation volume resistivity.

[0077] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the polymer material under test, the insulation performance of the polymer material under test can be indirectly obtained without directly measuring its insulation performance. This effectively solves the problem of inaccurate measurement of the insulation performance of the polymer material under test due to its application in specific products. Furthermore, it allows for accurate determination of the aging state of the polymer material under test, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0078] The above steps are explained in detail below:

[0079] In S110, the polymer material to be tested can be a polymer insulating material, such as polycarbonate (PC), polystyrene, polypropylene, epoxy resin, etc. In this embodiment, the polymer material can be used as a thin film on the outer surface of the battery cell, as an insulating cover for the battery module, or as the casing of the battery cell. It can also be used in other products such as cables and transformers. The battery cell can include, but is not limited to, lithium-ion batteries, lithium metal batteries, lithium-sulfur batteries, lead-acid batteries, nickel-metal hydride batteries, or lithium-air batteries.

[0080] The first relaxation enthalpy is the relaxation enthalpy of the polymer material being tested, used to characterize the heat absorbed per unit mass of the polymer material during the glass transition process, expressed in J / g. The first relaxation enthalpy can be obtained through thermal analysis methods, including but not limited to thermogravimetry (TG), differential thermal analysis (DTA), and differential scanning calorimetry (DSC).

[0081] The aging state of the physical properties of the polymer material under test can be determined based on the first relaxation enthalpy.

[0082] In S120, the study found that the relaxation enthalpy of the polymer material initially increased and then stabilized with aging, and the insulating volume resistivity of the polymer material also initially increased and then stabilized with aging. In other words, the relaxation enthalpy and insulating volume resistivity of the polymer material showed similar trends. Insulating volume resistivity is the impedance of a polymer material per unit volume to current, expressed in ohm-meters (Ω·m) or ohm-centimeters (Ω·cm).

[0083] Based on the above findings, this embodiment establishes a relationship between insulating volume resistivity and relaxation enthalpy, obtaining a first mapping relationship. This first mapping relationship can be a functional relationship, a tabular relationship, etc. According to this first mapping relationship, combined with the first relaxation enthalpy of the polymer material under test, the insulating volume resistivity of the polymer material under test can be indirectly calculated, thereby obtaining the insulating performance of the polymer material under test. This effectively solves the problem that the insulating volume resistivity is difficult to measure or that the measurement results have large errors because the polymer material under test is applied to specific products. Thus, the aging state of the polymer material under test can be accurately assessed.

[0084] For example, a relationship between insulating volume resistivity and relaxation enthalpy can be established based on a polymer material sample. The polymer material sample is made of the same material as the polymer material to be tested, thus ensuring the reliability and validity of the constructed first mapping relationship. The polymer material sample can be a polymer material whose insulating volume resistivity and relaxation enthalpy can be easily measured, such as raw materials, semi-finished products, or finished products.

[0085] In S130, the aging state of the polymer material under test can be determined based on the first insulating volume resistivity of the polymer material under test.

[0086] For example, the aging state of the polymer material under test can be directly characterized by the insulating volume resistivity. For instance, if the first insulating volume resistivity is ρ1, then the aging state of the polymer material under test is ρ1.

[0087] For example, the aging level of the polymer material under test can be determined based on its first insulating volume resistivity, and the aging level can be used to characterize the aging state of the polymer material. The relationship between insulating volume resistivity and aging level can be obtained through experiments, experience, etc. Each aging level can correspond to an insulating volume resistivity range. Therefore, in this embodiment, the range to which the first insulating volume resistivity belongs can be determined, and the aging level of the polymer material under test can be obtained based on the aging level corresponding to that range, thereby obtaining the aging state of the polymer material under test.

[0088] Figure 2 This is a second schematic flowchart illustrating a method for determining the aging state of a polymer material, provided for some embodiments of this application. Figure 2 and Figure 1 The difference is that, Figure 2 This also includes S210-S20. In some examples, S210 and S220 can be performed before S110. That is, for the same polymer material, before determining the aging state of similar polymer materials under test, a mapping relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states can be pre-established. Subsequently, the aging state of the polymer material under test can be directly evaluated based on this mapping relationship, which is simple and quick. In some examples, S210 and S220 can also be performed after S110 and before S120. That is, when it is necessary to evaluate the aging state of a certain polymer material, the mapping relationship between the insulating volume resistivity and relaxation enthalpy of that type of polymer material under different aging states is established. This ensures the accuracy of the constructed mapping relationship, and thus allows for accurate evaluation of the aging state of the polymer material under test.

[0089] The steps of S210 and S220 are explained below:

[0090] S210. Obtain the performance parameters of polymer material samples after aging under N different aging conditions.

[0091] The performance parameters include the second relaxation enthalpy and the second insulating volume resistivity; the material of the polymer sample is the same as that of the polymer material to be tested.

[0092] The polymer material sample here can be an unaged polymer material. In order to accurately determine the first mapping relationship, for example, the initially obtained polymer material can be processed to eliminate its thermal history and the processed polymer material can be marked as an unaged polymer material, thereby obtaining a polymer material sample.

[0093] For example, the initially obtained polymer material can be left to stand at a first temperature t1, and then at a second temperature t2 to obtain a polymer material sample. t1 and t2 represent the standing times. The first temperature is higher than the second temperature; for example, the second temperature can be a standard temperature, such as 25°C. The first temperature is lower than the glass transition temperature of the polymer material. The glass transition temperature is the temperature at which the polymer material transitions from a glassy state to a rubbery state, and can be measured using methods such as DSC, Dynamic Mechanical Analysis (DMA), and Thermomechanical Analysis (TMA).

[0094] For example, if the glass transition temperature of the polymer material is 162°C, then the first temperature can be set to 160°C.

[0095] In this embodiment, the original polymer material is placed in a high-temperature constant temperature chamber and then placed in a low-temperature constant temperature chamber for static treatment to obtain a polymer material sample after eliminating thermal history. The polymer material sample after eliminating thermal history can be used as a reference for the aged polymer material, providing a starting benchmark for various aging information and helping to conduct more accurate aging status assessments in the future.

[0096] The aging conditions here are used to age polymer material samples to obtain aged polymer materials. There can be N aging conditions. One aging condition corresponds to one polymer material sample. That is, in this embodiment, there can be multiple polymer material samples, and each polymer material sample has the same weight.

[0097] For example, N different aging conditions include standing at a target temperature for N different durations, the target temperature being determined based on the glass transition temperature of the polymer material sample.

[0098] Taking a polymer material sample with a glass transition temperature of 160℃ as an example, the target temperature can be set to 124℃, or any other temperature, as long as it is below 160℃. The aging time corresponding to different aging conditions can increase exponentially or at the same time interval.

[0099] In some embodiments, the aging time can be set to 1h, 2h, 4h, 8h, 24h, 48h, 96h, 192h, etc. This yields N aged polymer material samples.

[0100] For example, when aging polymer material samples, the polymer material samples can be placed in a constant temperature chamber to maintain the same temperature throughout the aging process, thus ensuring the aging effect.

[0101] In this embodiment, the aging temperatures corresponding to the N aging conditions are all the same, only the aging time is different. This can reduce the influence of different aging temperatures, weights and other conditions on the aging state, and make the performance parameters of the material under different aging conditions more meaningful and valuable.

[0102] For each aged polymer material sample, in some embodiments, its insulating volume resistivity can be measured using instruments such as a high-resistivity meter, and its relaxation enthalpy can be obtained using thermal analysis.

[0103] In some embodiments, the insulation volume resistivity corresponding to a portion of the aging time can be measured, and then the relationship between the measured insulation volume resistivity and the corresponding aging time can be fitted to obtain the mapping relationship between insulation volume resistivity and aging time. Based on this mapping relationship, the insulation volume resistivity corresponding to other aging times can be calculated, which is simple and quick.

[0104] In this embodiment, the insulation volume resistivity and relaxation enthalpy of each aged polymer material sample are denoted as the second insulation volume resistivity and the second relaxation enthalpy, respectively.

[0105] S220. Based on the corresponding second relaxation enthalpy and second insulating volume resistivity, a relationship fitting is performed to obtain the first mapping relationship.

[0106] Figure 3 Taking PC (polycarbonate) as an example, the relationship between the second relaxation enthalpy and the second insulating volume resistivity of PC materials under different aging states is illustrated. Figure 3 It can be observed that the second relaxation enthalpy and the second insulating volume resistivity exhibit approximately linear changes. Therefore, a linear relationship can be fitted based on the corresponding second relaxation enthalpy and second insulating volume resistivity to obtain the following first mapping relationship:

[0107] ρ=ρ0+(Δρ / ΔH0)ΔH

[0108] Where ρ is the insulating volume resistivity of PC material, ΔH is the relaxation enthalpy of PC material, Δρ / ΔH0 is the slope, and ρ0 is the insulating volume resistivity of the PC material sample, which can be directly measured by a high-resistivity meter. ΔH0 is the steady-state value of relaxation enthalpy, and Δρ is the steady-state value of insulating volume resistivity. In some embodiments, ΔH0 = 3.16 J / g, ρ0 = 49.4 × 10¹⁵ Ω·cm, and Δρ = 209.5 × 10¹⁵ Ω·cm.

[0109] Following the above embodiments, for the polymer material to be tested, after obtaining the first relaxation enthalpy of the polymer material to be tested, it can be substituted into the above formula to obtain the first insulating volume resistivity of the polymer material to be tested, which is not only simple and fast, but also has high accuracy.

[0110] In this embodiment, based on the aged polymer material sample, the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material can be established. This relationship clarifies the correlation between the thermodynamic and electrical parameters of the polymer material, reveals the microscopic mechanism of the change in the insulating performance of the polymer material after aging, and can not only quickly and accurately determine the insulating volume resistivity of the polymer material to be tested, but also provide guidance for the replacement of electrical and electronic equipment, and provide theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0111] Figure 4 This is the third flowchart illustrating a method for determining the aging state of a polymer material, provided for some embodiments of this application. Figure 4 and Figure 2 The difference is that, Figure 2 S210 in the middle can be further refined into Figure 4S410-S430 in the series.

[0112] S410. Select M polymer material samples from N polymer material samples, M <N。

[0113] This embodiment does not limit the selection process of the M polymer material samples. For example, the M polymer material samples with the shortest aging time can be selected from the N polymer material samples according to the aging time, or some polymer material samples with shorter aging time and some polymer material samples with longer aging time can be selected.

[0114] S420. Based on the performance parameters and aging time of M polymer material samples, perform relationship fitting to obtain the second mapping relationship between the performance parameters of polymer materials and aging time.

[0115] Taking PC material as an example, Figure 5 The relaxation enthalpy of PC materials at certain aging times is illustrated by example. Figure 5 As can be seen, the relaxation enthalpy of PC material exhibits an exponential trend of first increasing and then stabilizing with aging time. When the aging time is short, the relaxation enthalpy changes rapidly. As the aging time increases, the aging process slows down, and the change in relaxation enthalpy also tends to stabilize.

[0116] according to Figure 5 The relaxation enthalpy and aging time can be fitted to obtain a mapping relationship between relaxation enthalpy and aging time. For example, Where ΔH represents the relaxation enthalpy, t represents the aging time, and ΔH0 is the steady-state value of the relaxation enthalpy, which can be determined according to... Figure 5 The curves shown indicate that τ is the relaxation constant and β is the relaxation exponent. In some embodiments, ΔH0 = 3.168 J / g, τ = 9.92 h, and β = 0.41.

[0117] Figure 6 The insulating volume resistivity of PC materials at certain aging times is illustrated by example. Figure 6 As can be seen, the insulation volume resistivity of PC material also shows an exponential trend of first increasing and then stabilizing with the aging time. When the aging time is short, the insulation volume resistivity changes rapidly. As the aging time increases, the aging degree slows down and the change in insulation volume resistivity tends to stabilize.

[0118] By measuring the electrical parameters of materials at different aging stages, we can obtain the laws governing the changes in insulation performance during the aging process. This has important reference value for understanding the aging mechanism of materials, predicting their service life, and formulating maintenance and replacement strategies.

[0119] according to Figure 6The relationship between the volume resistivity of insulation and the aging time can be fitted to obtain the mapping relationship between the volume resistivity of insulation and the aging time.

[0120] In this embodiment, the mapping relationship between the relaxation enthalpy of polymer materials and aging time, and the mapping relationship between the volume resistivity of insulation and aging time are referred to as the second mapping relationship.

[0121] S430. Based on the second mapping relationship, determine the performance parameters of the other material samples among the N polymer material samples, excluding the M polymer material samples.

[0122] Based on the second mapping relationship, the performance parameters of other material samples can be calculated directly without having to perform repeated measurement steps, thus improving efficiency.

[0123] Taking relaxation enthalpy as an example, exemplarily, according to Figure 5 By fitting the mapping relationship between the relaxation enthalpy and the aging time, and combining it with the aging time of other material samples, the relaxation enthalpy of other material samples at the corresponding aging time can be obtained. This eliminates the need to perform thermal analysis on material samples at other aging times, which can greatly improve efficiency.

[0124] The calculation process for the volume resistivity of insulation is similar and will not be repeated here.

[0125] In this embodiment, the performance parameters and aging time of some polymer material samples are first fitted to obtain a second mapping relationship between the performance parameters of the polymer material and the aging time. Based on the second mapping relationship, the performance parameters of other polymer material samples under different aging times can be determined simply and quickly. Thus, the first mapping relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material can be obtained quickly, and the aging state of the polymer material to be tested can be evaluated quickly.

[0126] Taking the determination of the relaxation enthalpy of the polymer material to be tested by DSC as an example, in some embodiments, the above S110 may include the following steps:

[0127] The temperature control parameters of the thermal analyzer are determined based on the material characteristics of the polymer material to be tested. The temperature control parameters include the heating rate and temperature range of the thermal analyzer.

[0128] Thermal analysis was performed on the polymer material under test based on the temperature control parameters to obtain the heat flow curve of the polymer material under test.

[0129] The first relaxation enthalpy of the polymer material under test is determined based on the glass transition temperature corresponding to the heat flow curve.

[0130] The material characteristics described here are used to characterize the properties of the polymer material under test. Different material characteristics correspond to different temperature control parameters. Based on the material characteristics of the polymer material under test, appropriate temperature control parameters can be selected. Then, based on the selected temperature control parameters, thermal analysis of the polymer material under test is performed using DSC to obtain the first relaxation enthalpy of the polymer material under test. The correspondence between different material characteristics and temperature control parameters can be determined based on experience, experiments, etc. For example, material characteristics may include, but are not limited to, the material type and weight of the polymer material under test.

[0131] Temperature control parameters are used to control the heating of the polymer material to be tested by the thermal analyzer. These parameters may include the heating rate and temperature range, as well as parameters such as temperature resolution and atmosphere. The atmosphere refers to the gas used for thermal analysis of the polymer material using the DSC method; commonly used atmospheres include nitrogen, oxygen, and air.

[0132] Generally, the heating rate can be set between 10℃ / min and 20℃ / min. In practical applications, the heating rate can be further determined based on the material type and weight of the polymer being tested, within this conventional range. For example, if the amount of polymer being tested is small, the heating rate should be lower to avoid excessive temperature gradients that could lead to inaccurate test results. The setting of the temperature range is similar.

[0133] In practical applications, the polymer material to be tested can be placed in the DSC sample chamber beforehand, and a pre-set thermal analyzer can be used to heat the polymer material and record the heat change during the heating process. During the heating process, the DSC thermal analyzer presents the acquired heat change data in the form of a power-temperature spectrum, thus obtaining the heat flow curve of the polymer material to be tested.

[0134] The glass transition temperature of the polymer material under test can be obtained from the endothermic peak of the glass transition in the heat flow curve. Taking PC as an example, in some embodiments, the glass transition temperature of the PC can be found to be 144°C.

[0135] Based on the glass transition temperature, the first relaxation enthalpy of the polymer material under test can be obtained by integrating the difference between the heat flow curves of the polymer material under test and the polymer material sample. The integration interval is the interval corresponding to the initial coincidence point and the final coincidence point of the heat flow curves of the polymer material under test and the polymer material sample.

[0136] In this embodiment, the temperature control parameters of the thermal analyzer are determined based on the material characteristics of the polymer material to be tested, such as its material type and weight. This improves the accuracy of the temperature control parameters, resulting in a more accurate heat flow curve when performing thermal analysis on the polymer material to be tested using these parameters. Consequently, the relaxation enthalpy of the polymer material to be tested can be determined more accurately.

[0137] Taking aging status as the aging level as an example, Figure 7 This is the fourth flowchart illustrating a method for determining the aging state of a polymer material, provided for some embodiments of this application. Figure 7 and Figure 1 The difference is that, Figure 1 S130 in the middle can be further refined into Figure 7 The S710 in the middle.

[0138] S710. Determine the aging level of the polymer material to be tested based on the first insulating volume resistivity and the third mapping relationship; wherein, the third mapping relationship is used to characterize the relationship between different insulating volume resistivity and aging level of polymer materials.

[0139] The third mapping relationship can be determined based on experiments, experience, or requirements. Different aging levels can correspond to different insulation volume resistivity ranges. Based on the resistivity range to which the first insulation volume resistivity belongs, the aging level corresponding to the first insulation volume resistivity can be obtained, and thus the aging state of the polymer material to be tested can be obtained.

[0140] In this embodiment, based on the mapping relationship between insulation volume resistivity and aging level, and combined with the insulation volume resistivity of the polymer material to be tested, the aging level of the polymer material to be tested can be obtained. By using the aging level to assess its aging state, users can more intuitively understand the aging state of the polymer material to be tested, providing a guiding theoretical basis for the selection strategy of polymer materials in electrical equipment and electronic components, and providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0141] In some embodiments, after S130, the method for determining the aging state of the polymer material may further include the following steps:

[0142] If the first insulation volume resistivity is greater than the insulation volume resistivity threshold, an early warning message is output. The early warning message includes at least one of the following: the first insulation volume resistivity of the polymer material to be tested, the first relaxation enthalpy, the aging state, and the carrier supporting the polymer material to be tested.

[0143] The insulation volume resistivity threshold is the maximum value of the insulation volume resistivity corresponding to an acceptable or permissible aging state of the polymer material. The insulation volume resistivity threshold can be determined based on the safety requirements of the carrier supporting the polymer material under test. This carrier can be a battery cell, battery module, electrical equipment, or electronic equipment, etc. For example, if a carrier has high safety requirements, the insulation volume resistivity threshold can be set lower.

[0144] For example, if the first insulation volume resistivity is greater than the insulation volume resistivity threshold, it indicates that the aging of the polymer material under test is quite serious. In this case, a warning message can be output. The output method may include, but is not limited to, voice, SMS, email, telephone, etc.

[0145] In this embodiment, based on the early warning information, relevant personnel can fully understand the specific situation of the polymer material to be tested and quickly locate the specific carrier, providing theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0146] Based on the same inventive concept, embodiments of this application also provide a method for determining the aging state of a battery cell casing. The following, in conjunction with... Figure 8 The method for determining the aging state of a battery cell casing provided in the embodiments of this application will be described.

[0147] Figure 8 This is a flowchart illustrating a method for determining the aging state of a battery cell casing according to some embodiments of this application. The casing of the battery cell is made of a polymer material. Figure 8 As shown, the method for determining the aging state of the battery cell casing may include the following steps S810-S830.

[0148] S810, Obtain the third relaxation enthalpy of the shell.

[0149] S820. Determine the third insulating volume resistivity of the shell based on the third relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states.

[0150] S830. Determine the aging state of the casing based on the third insulation volume resistivity.

[0151] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the battery cell casing, the insulation performance of the battery cell casing can be indirectly obtained without directly measuring the casing's insulation performance. This effectively solves the problem of inaccurate measurement of insulation performance caused by the application of polymer materials in the battery cell casing, and thus allows for accurate determination of the aging state of the battery cell casing, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0152] For specific details, please refer to the above embodiments. For the sake of brevity, they will not be repeated here.

[0153] Based on the same inventive concept, this application also provides a device for determining the aging state of polymer materials. The following is in conjunction with… Figure 9 The apparatus for determining the aging state of polymer materials provided in the embodiments of this application will be described.

[0154] Figure 9 This is a schematic diagram of a device for determining the aging state of a polymer material, provided for some embodiments of this application. Figure 9 As shown, the aging state determination device 900 for the polymer material may include:

[0155] Acquisition module 901 is used to acquire the first relaxation enthalpy of the polymer material to be tested;

[0156] The determination module 902 is used to determine the first insulating volume resistivity of the polymer material to be tested based on the first relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states; and the aging state of the polymer material to be tested is determined based on the first insulating volume resistivity.

[0157] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the polymer material under test, the insulation performance of the polymer material under test can be indirectly obtained without directly measuring its insulation performance. This effectively solves the problem of inaccurate measurement of the insulation performance of the polymer material under test due to its application in specific products. Furthermore, it allows for accurate determination of the aging state of the polymer material under test, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0158] In some embodiments, the acquisition module 901 is further configured to acquire the performance parameters of the polymer material sample after aging under N different aging conditions, where N is an integer greater than 1, and the performance parameters include the second relaxation enthalpy and the second insulating volume resistivity; the material of the polymer material sample is the same as the material of the polymer material to be tested.

[0159] The aging state determination device 900 for the polymer material may further include:

[0160] The fitting module is used to fit the relationship based on the corresponding second relaxation enthalpy and second insulating volume resistivity to obtain the first mapping relationship.

[0161] In some embodiments, the aging state determination device 900 for the polymer material may further include:

[0162] The selection module is used to select M polymer material samples from N polymer material samples. <N;

[0163] The fitting module is also used to fit the relationship between the performance parameters and aging time of M polymer material samples to obtain a second mapping relationship between the performance parameters and aging time of the polymer material.

[0164] The determination module 902 is also used to determine the performance parameters of other material samples among the N polymer material samples, excluding the M polymer material samples, according to the second mapping relationship.

[0165] In some embodiments, the determining module 902 is further configured to determine the temperature control parameters of the thermal analyzer based on the material characteristics of the polymer material to be tested. The temperature control parameters include the heating rate and temperature range of the thermal analyzer.

[0166] The aging state determination device 900 for the polymer material may further include:

[0167] The thermal analysis module is used to perform thermal analysis on the polymer material under test according to the temperature control parameters, and obtain the heat flow curve of the polymer material under test.

[0168] The determination module 902 is also used to determine the first relaxation enthalpy of the polymer material to be tested based on the glass transition temperature corresponding to the heat flow curve.

[0169] In some embodiments, aging status includes aging level;

[0170] Module 902 is specifically used for:

[0171] The aging level of the polymer material to be tested is determined based on the first insulation volume resistivity and the third mapping relationship.

[0172] The third mapping relationship is used to characterize the relationship between different insulating volume resistivity and aging level of polymer materials.

[0173] In some embodiments, the aging state determination device 900 for the polymer material may further include:

[0174] The output module is used to output warning information when the first insulation volume resistivity is greater than the insulation volume resistivity threshold after the determining module 902 determines the aging state of the polymer material to be tested based on the first insulation volume resistivity. The warning information includes at least one of the following: the first insulation volume resistivity, the first relaxation enthalpy, the aging state, and the carrier supporting the polymer material to be tested.

[0175] Based on the same inventive concept, this application also provides a device for determining the aging state of a battery cell casing, wherein the casing of the battery cell is made of a polymer material. Figure 10 As shown, the aging condition determination device 1000 for the battery cell casing may include:

[0176] The acquisition module 1001 is used to acquire the third relaxation enthalpy of the shell;

[0177] The determination module 1002 is used to determine the third insulating volume resistivity of the shell based on the third relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states; and the aging state of the shell is determined based on the third insulating volume resistivity.

[0178] In this embodiment, by establishing a mapping relationship between the insulating volume resistivity and relaxation enthalpy of polymer materials under different aging states, the correlation between insulating volume resistivity and relaxation enthalpy during the aging process of polymer materials is revealed. Based on this mapping relationship, combined with the relaxation enthalpy of the battery cell casing, the insulation performance of the battery cell casing can be indirectly obtained without directly measuring the insulation performance of the battery cell casing. This effectively solves the problem of inaccurate measurement of the insulation performance caused by the application of polymer materials in the battery cell casing, and thus allows for accurate determination of the aging state of the battery cell casing, providing a theoretical basis and technical support for the safe operation and maintenance of related equipment.

[0179] Figure 11 This is a schematic diagram of the structure of an electronic device provided for some embodiments of this application. For example... Figure 11 As shown, the electronic device 1100 may include a processor 1101 and a memory 1102 storing programs or instructions. When the processor 1101 executes the program, it implements the steps in any of the above-described method embodiments.

[0180] For example, the program can be divided into one or more modules / units, one or more of which are stored in memory 1102 and executed by processor 1101 to complete this application. The one or more modules / units can be a series of program instruction segments capable of performing a specific function, which describe the execution process of the program in the device.

[0181] Specifically, the processor 1101 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0182] Memory 1102 may include mass storage for data or instructions. For example, and not limitingly, memory 1102 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 1102 may include removable or non-removable (or fixed) media. Where appropriate, memory 1102 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 1102 is non-volatile solid-state memory.

[0183] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, and electrical, optical, or other physical / tangible memory storage devices. Therefore, typically, memory includes one or more tangible (non-transitory) readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the methods according to one aspect of this disclosure.

[0184] The processor 1101 implements any of the methods described above by reading and executing programs or instructions stored in the memory 1102.

[0185] In one example, the electronic device 1100 may also include a communication interface 1103 and a bus 1104. The processor 1101, memory 1102, and communication interface 1103 are connected via the bus 1104 and communicate with each other.

[0186] The communication interface 1103 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0187] Bus 1104 includes hardware, software, or both, that couples components of electronic device 1100 together. For example, and not as a limitation, bus 1104 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 1104 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0188] In addition, in conjunction with the methods in the above embodiments, this application also provides a readable storage medium. This readable storage medium stores a program or instructions; when executed by a processor, the program or instructions implement any of the methods in the above embodiments. This readable storage medium can be read by a machine such as a computer.

[0189] This application also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above method embodiments and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0190] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0191] This application provides a computer program product stored in a readable storage medium. When executed by at least one processor, the program product can implement the various processes of the above method embodiments and achieve the same technical effects. To avoid repetition, further details are omitted here.

[0192] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0193] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0194] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0195] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0196] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for determining the aging state of a polymer material, characterized in that, include: Obtain the first relaxation enthalpy of the polymer material to be tested; The first insulating volume resistivity of the polymer material to be tested is determined based on the first relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states. The aging state of the polymer material to be tested is determined based on the first insulating volume resistivity.

2. The method according to claim 1, characterized in that, The method further includes: The performance parameters of a polymer material sample after aging under N different aging conditions are obtained, where N is an integer greater than 1. The performance parameters include the second relaxation enthalpy and the second insulating volume resistivity. The material of the polymer material sample is the same as the material of the polymer material to be tested. The first mapping relationship is obtained by fitting the relationship based on the corresponding second relaxation enthalpy and second insulating volume resistivity.

3. The method according to claim 2, characterized in that, The N different aging conditions include standing at a target temperature for N different durations, wherein the target temperature is determined based on the glass transition temperature of the polymer material sample.

4. The method according to claim 2 or 3, characterized in that, Obtain the performance parameters of polymer material samples after aging under N different aging conditions, including: M polymer material samples are selected from N polymer material samples. <N; Based on the performance parameters and aging time of M polymer material samples, a relationship fitting was performed to obtain the second mapping relationship between the performance parameters of polymer materials and the aging time. Based on the second mapping relationship, the performance parameters of the other material samples among the N polymer material samples, excluding the M polymer material samples, are determined.

5. The method according to any one of claims 1-4, characterized in that, The process of obtaining the first relaxation enthalpy of the polymer material to be tested includes: The temperature control parameters of the thermal analyzer are determined based on the material characteristics of the polymer material to be tested. The temperature control parameters include the heating rate and temperature range of the thermal analyzer. Thermal analysis was performed on the polymer material to be tested based on the temperature control parameters to obtain the heat flow curve of the polymer material to be tested; The first relaxation enthalpy of the polymer material under test is determined based on the glass transition temperature corresponding to the heat flow curve.

6. The method according to any one of claims 1-5, characterized in that, The aging state includes the aging level; The step of determining the aging state of the polymer material to be tested based on the first insulating volume resistivity includes: The aging level of the polymer material to be tested is determined based on the first insulation volume resistivity and the third mapping relationship. The third mapping relationship is used to characterize the relationship between different insulating volume resistivity and aging level of polymer materials.

7. The method according to any one of claims 1-6, characterized in that, After determining the aging state of the polymer material to be tested based on the first insulating volume resistivity, the method further includes: If the first insulation volume resistivity is greater than the insulation volume resistivity threshold, an early warning message is output. The early warning message includes at least one of the following: the first insulation volume resistivity of the polymer material to be tested, the first relaxation enthalpy, the aging state, and the carrier supporting the polymer material to be tested.

8. A method for determining the aging state of a battery cell casing, characterized in that, The casing of the battery cell is made of a polymer material, and the method includes: Obtain the third relaxation enthalpy of the shell; The third insulating volume resistivity of the shell is determined based on the third relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states. The aging state of the housing is determined based on the third insulating volume resistivity.

9. A device for determining the aging state of a polymer material, characterized in that, include: The acquisition module is used to acquire the first relaxation enthalpy of the polymer material to be tested; The determination module is used to determine the first insulating volume resistivity of the polymer material to be tested based on the first relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states; and the aging state of the polymer material to be tested is determined based on the first insulating volume resistivity.

10. A device for determining the aging state of a battery cell casing, characterized in that, The casing of the battery cell is made of polymer material, and the device includes: An acquisition module is used to acquire the third relaxation enthalpy of the shell; The determination module is used to determine the third insulating volume resistivity of the shell based on the third relaxation enthalpy and the first mapping relationship; wherein, the first mapping relationship is used to characterize the relationship between the insulating volume resistivity and relaxation enthalpy of the polymer material under different aging states; and the aging state of the shell is determined based on the third insulating volume resistivity.

11. An electronic device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the method for determining the aging state of polymer materials as described in any one of claims 1-7, or the steps of the method for determining the aging state of battery cell casing as described in claim 8.

12. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the method for determining the aging state of polymer materials as described in any one of claims 1-7, or the method for determining the aging state of a battery cell casing as described in claim 8.

13. A computer program product, characterized in that, When the instructions in the computer program product are executed by the processor of the electronic device, the electronic device performs the steps of the method for determining the aging state of polymer materials as described in any one of claims 1-7, or the steps of the method for determining the aging state of battery cell casing as described in claim 8.

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