Method for measuring the oil content of aluminum foil

Abstract

The present application discloses a method for measuring the oil content of aluminum foil. The method for measuring the oil content of aluminum foil comprises the steps of: obtaining an initial weight of a plurality of aluminum foil pieces—wherein the plurality of aluminum foil pieces are obtained by cutting from the aluminum foil to be measured—; determining a target heating method for the plurality of aluminum foil pieces based on an oil content change relationship, and heating the plurality of aluminum foil pieces by controlling a heating mechanism according to the target heating method—wherein the oil content change relationship includes the oil content of the aluminum foil pieces obtained according to at least one carbon coating method according to a plurality of heating methods—; obtaining a target weight of the plurality of aluminum foil pieces after heating is complete; and obtaining the oil content of the aluminum foil to be measured based on the weight difference between the initial weight and the target weight. The above-described solution can implement the measurement of the oil content on the surface of the aluminum foil.

Description

Technology Field

[0001] This application claims priority to a Chinese patent application filed with the National Intellectual Property Administration of China on July 11, 2024, with application number 202410931085.9 and title of invention 'Method for measuring oil amount of aluminum foil', the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of aluminum foil, and in particular to a method for measuring the oil content of aluminum foil. Background Technology

[0003] Along with the rapid development of the domestic electronics and electric vehicle industries, the demand for various types of batteries has increased sharply, leading to a corresponding rise in demand for related products, one of which is aluminum foil. Aluminum foil has been widely used in recent years and is generally slit into specifications for direct coating after rolling; however, a certain amount of oil (oil film) remains on the surface of the aluminum foil following precision rolling. The amount of this residual oil affects the battery's energy storage performance after coating with lithium battery materials. If the amount of oil across the entire surface of the aluminum foil is high (i.e., the oil film is thick), the adhesion of the coating material decreases, resulting in a thin or uneven coating layer, which consequently impacts the battery's energy storage capacity.

[0004] Currently, the industry evaluates the carbon coating effect of aluminum foil by characterizing its surface energy through the measurement of Dyne values. A higher Dyne value indicates greater surface energy and a superior carbon coating effect. The Dyne value of aluminum foil is influenced by a combination of surface oil characteristics, processing methods, and oil content. Through years of development, the lithium-ion battery foil industry has developed rolling oils containing high-ester additives, utilizing Dyne values ​​as a technical management indicator. Aluminum foil produced using these oils exhibits high surface energy and high oil content due to their high Dyne values ​​and thick oil films. While such aluminum foil meets technical requirements, it fails to satisfy production requirements. Therefore, a method is needed to measure the oil content on the surface of the aluminum foil. means of solving the problem

[0005] The present application provides a method for measuring the oil content of at least aluminum foil, thereby enabling the measurement of the oil content on the surface of aluminum foil.

[0006] The present application provides a method for measuring the oil content of aluminum foil, wherein the method for measuring the oil content of aluminum foil comprises: a step of obtaining an initial weight of a plurality of aluminum foil pieces - wherein the plurality of aluminum foil pieces are obtained by cutting from the aluminum foil to be measured -; a step of determining a target heating method for the plurality of aluminum foil pieces based on an oil content change relationship and heating the plurality of aluminum foil pieces by controlling a heating device according to the target heating method - wherein the oil content change relationship includes the oil content of the aluminum foil pieces obtained according to at least one carbon coating method according to a plurality of heating methods -; a step of obtaining a target weight of the plurality of aluminum foil pieces after heating is completed; and a step of obtaining the oil content of the aluminum foil to be measured based on the weight difference between the initial weight and the target weight.

[0007] In the solution described above, a plurality of aluminum foil pieces are first obtained from the aluminum foil to be measured, a heating method for the plurality of aluminum foil pieces is determined according to a previously obtained relationship of oil amount change, and the weight of the volatilized oil is determined based on the difference in weight before and after heating of the plurality of aluminum foil pieces, thereby determining the oil amount of the plurality of aluminum foil pieces and obtaining the oil amount of the aluminum foil to be measured.

[0008] In some embodiments, the method for measuring the oil content of aluminum foil comprises the step of obtaining the oil content of a plurality of heating methods for an aluminum foil piece obtained according to a different carbon coating method—wherein the heating method includes one or more heating parameters among a heating time, a heating temperature, and a method of arranging a plurality of groups of aluminum foil pieces within a heating device, wherein at least one heating parameter according to the different heating method is different—; and further comprises the step of obtaining a relationship of oil content change based on the oil content of a plurality of heating methods for an aluminum foil piece obtained according to each carbon coating method.

[0009] In the above-described solution, the oil amount for each of the multiple heating methods of aluminum foil pieces obtained according to different carbon coating methods is obtained, and by determining an appropriate target heating method based on the relationship of oil amount change, the weight change between the weight after heating completion and the initial weight is made more distinct, thereby facilitating the calculation of the corresponding oil amount.

[0010] In some embodiments, the carbon coating method includes a non-coating and a soap-lock coating, and the oil amount change relationship includes a first oil amount change according to a plurality of heating methods of an aluminum foil piece obtained according to the non-coating and a second oil amount change according to a plurality of heating methods of an aluminum foil piece obtained according to the soap-lock coating, and the step of determining a target heating method of a plurality of groups of aluminum foil pieces based on the oil amount change relationship includes: determining a first heating method corresponding to the maximum oil amount in the first oil amount change and determining a second heating method corresponding to the maximum oil amount in the second oil amount change; and determining a target heating method based on the first heating method and the second heating method.

[0011] In the above-described solution, the first oil amount change and the second oil amount change are determined using aluminum foil obtained according to two methods of omission coating and soaplock coating, thereby determining the first heating method and the second heating method, and then the accuracy of the determined target heating method can be further improved by comprehensively considering the target heating method by referring to the heating methods according to the two carbon coating methods.

[0012] In some embodiments, the step of determining a target heating method based on a first heating method and a second heating method comprises: determining the first heating method or the second heating method as the target heating method when the first heating method and the second heating method are the same; or, when the first heating method and the second heating method are different, determining the weights of the first heating method and the second heating method, and performing weighted fusion on at least one heating parameter among the first heating method and the second heating method according to the weights to obtain a target heating method.

[0013] In the solution described above, if the two heating methods are identical, one of them is directly determined as the target heating method, and if the two heating methods are different, a more appropriate target heating method can be determined by referring to the first heating method and the second heating method.

[0014] In some embodiments, a heating device is provided with a first receiving space, and the first receiving space is used to arrange a plurality of groups of aluminum foil pieces, and the step of heating the plurality of groups of aluminum foil pieces by controlling the heating device according to a target heating method comprises: a step of gradually increasing the temperature of the first receiving space within the heating device in which the plurality of groups of aluminum foil pieces are arranged to a target temperature within a first preset period; and a step of continuously heating for a second preset period according to the target temperature, wherein the first preset period is shorter than the second preset period.

[0015] In the solution described above, by setting a relatively short heating time and a relatively long constant temperature holding time, it is possible to ensure that the oil on the surface of the aluminum foil is sufficiently burned, thereby making the amount of oil on the surface of the aluminum foil subject to measurement more accurate.

[0016] In some embodiments, the heating device is provided with a first receiving space, and the first receiving space is used to arrange a plurality of groups of aluminum foil pieces, and the step of heating the plurality of groups of aluminum foil pieces by controlling the heating device according to a target heating method comprises the step of arranging different groups of aluminum foil pieces in different second receiving spaces of a heating support—each second receiving space is independently configured in the heating support, wherein each group of aluminum foil pieces is distinguished according to acquisition time—; and the step of arranging the heating support in the first receiving space of the heating device to heat each group of aluminum foil pieces in the heating support.

[0017] In the solution described above, by placing different groups of aluminum foil pieces within different receiving spaces of a heating support, the solution can ensure that the oil on the surface of the aluminum foil pieces volatilizes more sufficiently compared to a method of stacking each group of aluminum foil pieces in one place.

[0018] In some embodiments, the second receiving space includes a through-groove formed by being surrounded by a plurality of side walls, and the through-groove is used to place aluminum foil pieces of each group.

[0019] In the solution described above, the second receiving space is configured as a through-groove formed by surrounding a plurality of side walls, and by placing each group of aluminum foil pieces within the corresponding through-groove, the volatilization efficiency of the surface oil of each aluminum foil piece can be improved compared to when the receiving space is a closed space or a semi-closed space.

[0020] In some embodiments, the aluminum foil to be measured is an aluminum coil formed by winding, and the method further comprises the steps of: obtaining a multilayer target aluminum foil from the aluminum foil to be measured; obtaining a plurality of aluminum foil pieces from the center region of each layer of the target aluminum foil; and grouping each aluminum foil piece to obtain a plurality of groups of aluminum foil pieces.

[0021] In the solution described above, a multilayer target aluminum foil is first obtained from an aluminum coil, a plurality of aluminum foil pieces are obtained from the central region of each target aluminum foil, and then the obtained aluminum foil pieces are grouped to obtain a plurality of groups of aluminum foil pieces, thereby reducing interference with the oil quantity measurement caused by the potentially contaminated region at the edge of each target aluminum foil, and thus ensuring the accuracy of the oil quantity measurement of the target aluminum foil.

[0022] In some embodiments, the step of obtaining a plurality of groups of aluminum foil pieces by grouping each aluminum foil piece comprises: a step of obtaining at least one aluminum foil piece stack corresponding to the target aluminum foil by overlapping a plurality of aluminum foil pieces obtained from the target aluminum foil for each layer of the target aluminum foil; a step of discarding the aluminum foil pieces located at the top and bottom layers, respectively, in the plurality of aluminum foil piece stacks; and a step of obtaining a plurality of groups of aluminum foil pieces by grouping each of the plurality of aluminum foil piece stacks into aluminum foil piece groups.

[0023] In the solution described above, the accuracy of measuring the amount of aluminum foil oil to be measured can be ensured by obtaining a stack of multiple aluminum foil pieces, discarding the aluminum foil pieces that are likely to be contaminated located at the top and bottom layers of each aluminum foil piece stack, and then grouping them into multiple groups of aluminum foil pieces.

[0024] In some embodiments, the step of obtaining the oil amount of the aluminum foil to be measured based on the weight difference between the initial weight and the target weight includes: obtaining a ratio between the weight difference and the initial weight; determining a first multiplication value of the ratio and the thickness of a plurality of groups of aluminum foil pieces; determining a second multiplication value obtained by multiplying the first multiplication value by the density of the aluminum foil pieces as the oil amount of the plurality of groups of aluminum foil pieces, and determining the oil amount of the plurality of groups of aluminum foil pieces as the oil amount of the aluminum foil to be measured.

[0025] In the solution described above, the amount of oil on the surface of the aluminum foil piece within a unit area can be determined by considering the thickness and density of the multiple aluminum foil pieces.

[0026] It should be understood that the general description above and the detailed description below are illustrative and interpretive only and are not intended to limit the present application. Brief explanation of the drawing

[0027] The drawings attached herein are incorporated into the specification and constitute part of the specification. These drawings illustrate embodiments conforming to the present application and are used together with the specification to explain the technical solution of the present application. FIG. 1 is a flowchart of a method for measuring the oil content of aluminum foil according to some embodiments of the present application. FIG. 2 is a schematic diagram showing the relationship between the change in oil amount in a method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 3 is a schematic diagram showing the structure of a heating support in a method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 4 is a schematic diagram showing a cutting method of the target aluminum foil center area in a method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 5 is a dispersion component diagram included in the R&R report in the method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 6 is an oil amount-sample number (experimenter) correlation chart included in the R&R report in the method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 7 is an R control chart included in the R&R report of the method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 8 is an Xbar control chart included in the R&R report of the method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 9 is an oil amount-experimenter correlation diagram included in the R&R report in the method for measuring the oil amount of aluminum foil according to some embodiments of the present application. FIG. 10 is a schematic diagram comparing the surface oil amount of aluminum foil in a method for measuring the oil amount of aluminum foil according to some embodiments of the present application. Specific details for implementing the invention

[0028] Below, the solution of the embodiment of the present application will be described in detail by combining it with the drawings attached to the specification.

[0029] In the description below, specific details such as specific subsystem structures, interfaces, and technologies are presented for illustrative purposes, not for limitation, to enable a full understanding of the present application.

[0030] In this specification, the term 'and / or' indicates that three relationships may exist when describing the association of associated objects. For example, A and / or B may indicate the case where A exists alone, the case where A and B exist simultaneously, or the case where B exists alone. Additionally, in this specification, the symbol ' / ' generally signifies that the preceding and succeeding associated objects have an 'or' relationship. Furthermore, in this specification, 'multiple' indicates two or more than two. Additionally, in this specification, the term 'at least one' indicates any combination of at least two of one or more of a plurality, for example, that at least one of A, B, and C includes one or more elements selected from a set composed of A, B, and C.

[0031] Aluminum foil current collectors used in lithium-ion batteries are produced through a rolling process, and rolling oil is sprayed onto the surface. Currently, there is no effective method to measure the amount of residual rolling oil at the time of shipment. If the amount of oil is too high, problems such as missing coating and carbon layer delamination occur when the aluminum foil is used for carbon coating, and during electrode plate manufacturing, active materials detach from the aluminum foil or adhesion is reduced, causing cell short circuits and capacity reduction.

[0032] Currently, methods for measuring oil content on the surface of aluminum foil primarily rely on observing the time required for the oil film to volatilize or evaluating the oil amount through odor; however, these methods have clear limitations in that they cannot be quantified. Accurate visual assessment is impossible when the rolling oil is relatively clean, has a low oil content, or is relatively transparent, and odor measurement suffers from poor repeatability because it relies heavily on the inspector's subjective judgment.

[0033] To solve this technical problem, the present application cuts the aluminum foil to be measured to obtain a plurality of groups of aluminum foil pieces, and measures the weight of the plurality of groups of aluminum foil pieces before and after heating. Since oil volatilizes at high temperatures, the amount of oil in the plurality of groups of aluminum foil pieces is determined based on the difference in weight before and after heating, and then the amount of oil in the aluminum foil to be measured is determined based on the amount of oil. The method of the present application is repeatable and can quantify the amount of oil on the surface of the aluminum foil.

[0034] Referring to FIG. 1, the present application provides a method for measuring the oil content of aluminum foil, which may include steps (S11) through (S14). The method for measuring the oil content of aluminum foil includes the following steps: Step (S11): Obtain an initial weight of a plurality of aluminum foil pieces. Here, the plurality of aluminum foil pieces are obtained by cutting from the aluminum foil to be measured. Step (S12): Determine a target heating method for the plurality of aluminum foil pieces based on the oil content change relationship, and heat the plurality of aluminum foil pieces by controlling a heating mechanism according to the target heating method. Here, the oil content change relationship includes the oil content of the aluminum foil pieces obtained according to at least one carbon coating method for a plurality of heating methods. Step (S13): Obtain a target weight of the plurality of aluminum foil pieces after heating is completed. Step (S14): Obtain an oil content of the aluminum foil to be measured based on the weight difference between the initial weight and the target weight.

[0035] The oil on the surface of the aluminum foil being measured is generally rolling oil. Alternatively, the method of obtaining multiple groups of aluminum foil pieces may be by cutting them from the aluminum foil being measured using an automatic cutting system or by cutting them manually. The automatic cutting system may be any system equipped with a cutting function, and is not specifically limited thereto. The initial weight of the multiple groups of aluminum foil pieces may be the total weight of the multiple groups of aluminum foil pieces or the total weight of some groups of aluminum foil pieces. Here, the multiple groups may be a single group or multiple groups, and each group contains multiple aluminum foil pieces. Since the weight of a single aluminum foil is light, the accuracy of the oil quantity measurement can be improved in this solution by selecting multiple aluminum foil pieces to perform the oil quantity measurement. In some application scenarios, among multiple groups of aluminum foil pieces, each group of aluminum foil pieces has a single initial weight and a target weight; that is, each group of aluminum foil pieces determines a single oil amount based on its respective initial weight, target weight, thickness, and density, and the maximum oil amount corresponding to each group of aluminum foil pieces can be determined as the oil amount of the aluminum foil to be measured, or the average value of each oil amount can be determined as the oil amount of the aluminum foil to be measured. In some application scenarios, multiple groups of aluminum foil pieces are weighed collectively to obtain a single initial weight and a single target weight, thereby obtaining a single oil amount, and this oil amount is directly determined as the oil amount of the aluminum foil to be measured. High-precision weighing tools may be used for weighing. For example, multiple groups of aluminum foil pieces can be transported to the weighing tool via a transport method such as a robot arm or a belt conveyor. The relationship regarding oil amount variation includes multiple oil amounts according to heating methods for aluminum foil pieces obtained according to at least one carbon coating method. Carbon coating methods can be classified in various ways.For example, the carbon coating method may include omission coating and soap-free coating, or a different carbon coating method may be determined depending on the carbon coating equipment, or a different carbon coating method may be determined depending on the composition of the carbon being coated. In other words, a different carbon coating method can be determined by comprehensively considering various factors. The relationship regarding oil amount change may be the change in oil amount for a plurality of heating methods of the aluminum foil piece, and through this relationship regarding oil amount change, a heating method in which the oil amount changes relatively distinctly can be determined as the target heating method for the aluminum foil piece. Here, the heating parameter included in the heating method may be any parameter that can influence the change in oil amount. The heating device may be any equipment capable of temperature output, including but not limited to muffle furnaces, blower dryers, vacuum furnaces, and high-temperature dryers. The environment within the heating device may be a vacuum environment or a non-vacuum environment. The arrangement method of multiple groups of aluminum foil pieces within the heating device may be a winding arrangement method, a stacking arrangement method, a cutting arrangement method, or a method of separating and arranging each group of aluminum foil pieces using a heating support. The method of heating multiple groups of aluminum foil pieces by placing them in a heating device may involve first placing the multiple groups of aluminum foil pieces in the heating device and then gradually raising the temperature inside the heating device to a target temperature, or, first preheating the heating device and then placing the multiple groups of aluminum foil pieces in the heating device after preheating is complete. Optionally, the target temperature is higher than the distillation point temperature of the rolling oil. That is, the present solution reduces the weight of the multiple groups of aluminum foil pieces by baking them at a temperature higher than the distillation point temperature of the rolling oil, thereby causing residual oil on the surface of the aluminum foil to volatilize through baking. Subsequently, the amount of oil in the aluminum foil to be measured can be determined through the change in weight of the multiple groups of aluminum foil pieces.

[0036] In the solution described above, a plurality of aluminum foil pieces are first obtained from the aluminum foil to be measured, a heating method for the plurality of aluminum foil pieces is determined according to a previously obtained relationship of oil amount change, and the weight of the volatilized oil is determined based on the difference in weight before and after heating of the plurality of aluminum foil pieces, thereby determining the oil amount of the plurality of aluminum foil pieces and obtaining the oil amount of the aluminum foil to be measured.

[0037] In some embodiments, the method further comprises the step of obtaining an oil amount for a plurality of heating methods for an aluminum foil piece obtained according to a different carbon coating method. Here, the heating method includes one or more heating parameters among a heating time, a heating time, a heating temperature, a cooling time, and a method of arranging a plurality of groups of aluminum foil pieces within a heating device. Here, at least one heating parameter according to the different heating method is different. Then, a relationship of oil amount change is obtained based on the oil amount for a plurality of heating methods for an aluminum foil piece obtained according to each carbon coating method.

[0038] Since the direct cause of issues such as missing coating and powder detachment during the carbon coating process of aluminum foil for lithium-ion batteries is excessive residual oil on the surface of the aluminum foil, this solution collects aluminum foils with varying carbon coating amounts and tests changes in oil content during the heating process (baking process) by utilizing different sample preparation methods (methods for obtaining aluminum foil for heating), heating temperatures, the time required to raise the temperature of the heating apparatus from room temperature to the target temperature, the time to cool from the target temperature to room temperature or other temperatures after heating is complete, the time to maintain the heating temperature, or the arrangement method of multiple groups of aluminum foil pieces within the heating apparatus. Carbon coating methods can be classified in various ways. For example, carbon coating methods may include missing coating and soap-free coating, or different carbon coating methods may be determined depending on the carbon coating equipment, or different carbon coating methods may be determined depending on the composition of the carbon being coated. In other words, different carbon coating methods can be determined by comprehensively considering various factors. For the convenience of explanation, aluminum foil pieces obtained according to different carbon coating methods are used as sample aluminum foil pieces. Aluminum foil pieces according to different carbon coating methods are obtained using various sample preparation methods, and then changes in oil content according to various heating parameters according to different carbon coating methods are tested. Subsequently, a target heating method (e.g., heating time, heating temperature, or other heating parameters) is determined based on the volatility and oxidation characteristics of the aluminum foil surface oil derived from each change in oil content. Additionally, by further determining the method for preparing aluminum foil samples, multiple groups of aluminum foil pieces can subsequently be obtained from the aluminum foil subject to measurement using this target aluminum foil sample preparation method. The target sample preparation method and heating method are determined based on the sample preparation method and heating parameters in which a distinct change in oil content occurs.In the sample preparation method, specifications are defined regarding how many grams of aluminum foil to obtain from the aluminum foil to be measured each time, and from which area of ​​the aluminum foil to obtain the foil. For example, the relationship regarding oil content change can be obtained through the following method. The heating temperature is fixed at heating temperature A, and the change in oil content is tested according to different heating times, different heating increase times, different cooling times, different arrangement methods of multiple groups of aluminum foil pieces within the heating apparatus, or different aluminum foil sample preparation methods. Alternatively, the heating time is fixed at heating time B, and the change in oil content is tested according to different heating temperatures, different cooling times, different arrangement methods of multiple groups of aluminum foil pieces within the heating apparatus, or different sample preparation methods of the target aluminum foil. Here, for observation purposes, only one parameter or a small number of parameters may be changed for each test. Thus, the change in oil content according to various test parameters can be recorded in the relationship regarding oil content change, thereby allowing the determination of desirable heating parameters and sample preparation methods.

[0039] The oil amount may be the ratio between the weight difference of the sample aluminum foil piece before and after heating and the initial weight of the sample aluminum foil piece before heating, or the oil amount may represent only the weight difference of the sample aluminum foil piece before and after heating. In this embodiment, the oil amount is described as the amount of oil attached to the aluminum foil per unit area. The oil amount change relationship records the oil amount for each different heating method of the aluminum foil piece obtained according to different carbon coating methods. The oil amount change relationship may take the form of an oil amount change curve or a bar graph. Based on the oil amount change relationship, a general heating method applied to the aluminum foil obtained according to various carbon coating methods can be determined as the target heating method. For example, among the multiple oil amounts obtained by applying various heating methods to the aluminum foil piece obtained according to different carbon coating methods, the heating method corresponding to the maximum oil amount or a significantly high oil amount is combined to obtain the target heating method. Optionally, based on the oil amount change relationship, it can be further determined whether to obtain multiple groups of aluminum foil pieces specifically from the aluminum foil to be measured. For example, it is determined how many grams to obtain per group, whether to obtain a total of multiple groups, and at which location on the aluminum foil to be measured each group. In some application scenarios, the heating device is a muffle furnace, and multiple groups of aluminum foil pieces are placed inside the muffle furnace. The muffle furnace is heated from room temperature to 300°C (heating time ≤ 35 min), and baking can be performed for 1 hour after reaching 300°C. After baking for 1 hour, when the internal temperature of the muffle furnace cools to approximately 150°C, the multiple groups of aluminum foil pieces are removed, and the target weight is obtained after the multiple groups of aluminum foil pieces have cooled to room temperature.

[0040] In the above-described solution, the amount of oil for aluminum foil pieces obtained according to different carbon coating methods is obtained for each different heating method, and by determining an appropriate target heating method based on the relationship of oil amount change, the weight change between the weight after heating completion and the initial weight is made more distinct, thereby facilitating the calculation of the corresponding oil amount.

[0041] In some embodiments, the carbon coating method includes a non-coating and a soap-lock coating, and the relationship of oil amount change includes a first oil amount change according to a plurality of heating methods of an aluminum foil piece obtained according to the non-coating and a second oil amount change according to a plurality of heating methods of an aluminum foil piece obtained according to the soap-lock coating. A method for determining the target heating method of a plurality of groups of aluminum foil pieces based on the above-described relationship of oil amount change may be to determine a first heating method corresponding to the maximum oil amount among the first oil amount change and to determine a second heating method corresponding to the maximum oil amount among the second oil amount change. The target heating method is determined based on the first heating method and the second heating method.

[0042] Missing coating can be understood as the existence of areas on the aluminum foil surface where the carbon coating is missing, and soapy coating can be understood as the existence or measurement of areas on the aluminum foil surface where the carbon coating is missing. Here, the first oil amount change and the second oil amount change correspond to aluminum foil pieces according to two different carbon coating methods obtained by the same sample preparation method, and the oil amounts for each of the two aluminum foil pieces according to different heating methods can be obtained by heating these two aluminum foil pieces with different heating methods. For example, two aluminum foil pieces are placed sequentially in a heating apparatus at 300°C and heated for 0.5h, 1h, 2h, and 4h to obtain two oil amount changes. Specifically, referring to FIG. 2, the aluminum foil obtained according to the missing coating has the largest oil amount when the heating time is 1h, and the aluminum foil obtained according to the soapy coating has the largest oil amount when the heating time is 1h; therefore, 1h can be directly determined as the heating time for the target heating method. However, in other carbon coating methods or other sample manufacturing methods, the possibility that two oil amount changes may reach the maximum oil amount in the same heating method is not excluded, so the target heating method can be determined by combining the heating methods. For example, in the present application, the change in oil amount obtained according to different independent variables is different, and the final heating temperature, sample manufacturing method, or heating apparatus can be determined based on the change in oil amount obtained under various conditions.

[0043] In the above-described solution, the first oil amount change and the second oil amount change are determined using aluminum foil obtained according to two methods of omission coating and soaplock coating, thereby determining the first heating method and the second heating method, and then the accuracy of the determined target heating method can be further improved by comprehensively considering the target heating method by referring to the heating methods according to the two carbon coating methods.

[0044] In some embodiments, the method of determining a target heating method based on the first heating method and the second heating method described above may be to determine the first heating method or the second heating method as the target heating method when the first heating method and the second heating method are the same; or, when the first heating method and the second heating method are different, to determine the weights of the first heating method and the second heating method, and to obtain a target heating method by performing weighted fusion on at least one heating parameter among the first heating method and the second heating method according to the weights.

[0045] If the first heating method and the second heating method are identical, it implies that aluminum foil pieces obtained according to different carbon coating methods under this heating method can all have high oil content, so this heating method can be directly determined as the target heating method. If the two obtained heating methods are different, the target heating method can be obtained by weighted fusion of the two heating methods. In some application scenarios, if the weight of one heating method is 0 and the weight of the other heating method is 1, the heating method with a weight of 1 is directly determined as the target heating method. In some application scenarios, if the weights of both heating methods are intermediate values ​​between 0 and 1, the target heating method can be obtained by multiplying at least some parameters of the two heating methods by their respective weights and then summing them. Optionally, the weights can be set dynamically. For example, the weights can be set according to the ratio between the oil content obtained based on the first heating method and the second heating method. For example, the first heating method and the second heating method differ only in the heating time, and in the first heating method, heating is performed for 1 hour and the oil amount is 30 mg / m³ 2 And, in the second heating method, heating is performed for 1.5h and the oil amount is 15mg / m³ 2And, if the weight of the first heating method is 30 / 45 and the weight of the second heating method is 15 / 45, the final heating time is 1.17h. Of course, this is merely an example, and in other application scenarios, if the difference between the oil amounts corresponding to the two heating methods is greater than or equal to a preset difference value, the weight of the heating method corresponding to the one with the larger oil amount is set to 1, that is, this heating method is directly determined as the target heating method. If there are at least two different heating parameters for the first heating method and the second heating method, the weights of the different heating parameters may be the same or different, and the weight of each heating parameter may be preset or set according to the ratio between the oil amounts, etc.

[0046] In the solution described above, if the two heating methods are identical, one of them is directly determined as the target heating method, and if the two heating methods are different, a more appropriate target heating method can be determined by referring to the first heating method and the second heating method.

[0047] In some embodiments, a heating device is provided with a first receiving space, the first receiving space is used to place a plurality of groups of aluminum foil pieces, and a method of heating the plurality of groups of aluminum foil pieces by controlling the heating device according to a target heating method may be to gradually raise the temperature of the first receiving space within the heating device in which the plurality of groups of aluminum foil pieces are placed to a target temperature within a first preset period; and to continuously heat for a second preset period according to the target temperature, wherein the first preset period is shorter than the second preset period.

[0048] This first receiving space may be a sealable receiving space. For example, multiple groups of aluminum foil pieces may be placed in this first receiving space, the first receiving space may be closed, and then reopened after heating is complete. Gradual heating to a target temperature may involve heating to the target temperature at a constant speed within a first preset period or heating to the target temperature in a non-linear manner. The method of arranging multiple groups of aluminum foil pieces within the heating mechanism may be a method of arranging them as flat plates, a method of arranging them by forming rolls, or a method of arranging each group of aluminum foil pieces by separating them using heating supports. Continuous heating for a second preset period according to the target temperature can be understood as maintaining the temperature within the heating mechanism at the target temperature and having the holding time be the second preset period.

[0049] In the solution described above, by setting a relatively short heating time and a relatively long constant temperature holding time, it is possible to ensure that the oil on the surface of the aluminum foil is sufficiently burned, thereby making the amount of oil on the surface of the aluminum foil subject to measurement more accurate.

[0050] In some embodiments, the heating device is provided with a first receiving space, and the first receiving space is used to accommodate a plurality of groups of aluminum foil pieces. A method of heating the plurality of groups of aluminum foil pieces by controlling the heating device according to a target heating method may involve placing different groups of aluminum foil pieces into different second receiving spaces of the heating support. Here, each second receiving space is configured independently in the heating support, and each group of aluminum foil pieces is distinguished according to the acquisition time. The heating support is placed within the first receiving space of the heating device to heat each group of aluminum foil pieces in the heating support.

[0051] For example, the method of grouping aluminum foil pieces obtained from the aluminum foil subject to measurement involves grouping the obtained aluminum foil pieces into one group, obtaining the next group of aluminum foil pieces after the weight of one group of aluminum foil pieces reaches a preset weight, or combining them according to the order of acquisition after all aluminum foil pieces have been obtained, and the weight difference between different groups of aluminum foil pieces is relatively small. For example, in this embodiment, the weight of each group of aluminum foil pieces is selected to be 30 to 40 g. The role of the heating support is to separate the aluminum foil pieces of each group. If all groups of aluminum foil pieces are stacked in one place, it may be difficult for the oil on the surface of the aluminum foil pieces in the middle to volatilize, and if the aluminum foil pieces of each group are separated using the heating support, the oil on the surface of the aluminum foil pieces of each group can volatilize more effectively.

[0052] In the solution described above, by placing different groups of aluminum foil pieces within different receiving spaces of a heating support, the solution can ensure that the oil on the surface of the aluminum foil pieces volatilizes more sufficiently compared to a method of stacking each group of aluminum foil pieces in one place.

[0053] In some embodiments, the second receiving space includes a through-groove formed by being surrounded by a plurality of side walls, and the through-groove is used to place aluminum foil pieces of each group.

[0054] Here, the side wall may be a side wall with pores or a side wall without pores. In some application scenarios, a plurality of through holes may be formed in the side wall, and both ends of these through holes may be connected to two receiving spaces, respectively; in other application scenarios, no through holes are formed in the side wall. By forming through grooves and placing each group of aluminum foil pieces within the through grooves, oil volatilization on the surface of the aluminum foil can be facilitated. Refer to FIG. 3 for the specific structure of the heating support, and the heating support (10) may be a two-layer or multi-layer structure, and each layer may include a plurality of receiving spaces (100), and each receiving space may include a through groove (120) formed by being surrounded by a plurality of side walls (110). The dimensions of the heating support (10) may be set according to the dimensions of the heating mechanism. That is, in order to conveniently place the heating support (10) inside the heating device, the dimensions of the heating support (10) are generally smaller than the dimensions of the internal receiving space of the heating device.

[0055] In the solution described above, the second receiving space is configured as a through-groove formed by surrounding a plurality of side walls, and by placing each group of aluminum foil pieces within the corresponding through-groove, the volatilization efficiency of the surface oil of each aluminum foil piece can be improved compared to when the receiving space is a closed space or a semi-closed space.

[0056] In some embodiments, the aluminum foil to be measured is an aluminum coil formed by winding, and the method further comprises the steps of: obtaining a multilayer target aluminum foil from the aluminum foil to be measured; obtaining a plurality of aluminum foil pieces from the center region of each layer of the target aluminum foil; and grouping each aluminum foil piece to obtain a plurality of groups of aluminum foil pieces.

[0057] Generally, since the aluminum foil obtained through processing is arranged in the form of an aluminum coil, a multilayer target aluminum foil can be obtained by cutting from the aluminum coil and cutting multiple groups of aluminum foil pieces from each layer of the target aluminum foil. The center area can be understood as an area located at a certain distance from the edge of each target aluminum foil. In some application scenarios, the distance between the center area and the edge of the target aluminum foil may be smaller than the length or width of a single aluminum foil piece, while in other application scenarios, the distance between the center area and the edge of the target aluminum foil may be greater than or equal to the length or width of a single aluminum foil piece. Specifically, the cutting process can be understood as a sampling process; in other words, sampling is not performed at the edge of each target aluminum foil. Specifically, the method of obtaining the target aluminum foil from the aluminum foil to be measured and the method of obtaining each aluminum foil piece from the target aluminum foil can be performed via an automatic cutting system or manually, and are not specifically limited thereto. For example, the automatic cutting system is equipped with a cutting blade, stacks each target aluminum foil, and can cut from the top target aluminum foil to the bottom target aluminum foil in one go using the cutting blade, thereby achieving a fast cutting speed; or, the automatic cutting system cuts a single target aluminum foil, transfers and discharges the cut target aluminum foil from the cutting area of ​​the automatic cutting system, moves the next target aluminum foil to the cutting area, and cuts its center area using the cutting blade. The manual cutting method may involve cutting one after cutting the next, or inserting a knife perpendicular to the stacking direction of each target aluminum foil to cut the stacked target aluminum foils in one go.

[0058] In the solution described above, a multilayer target aluminum foil is first obtained from an aluminum coil, a plurality of aluminum foil pieces are obtained from the central region of each target aluminum foil, and then the obtained aluminum foil pieces are grouped to obtain a plurality of groups of aluminum foil pieces, thereby reducing interference with the oil quantity measurement caused by the potentially contaminated region at the edge of each target aluminum foil, and thus ensuring the accuracy of the oil quantity measurement of the target aluminum foil.

[0059] In some embodiments, the method of obtaining a plurality of groups of aluminum foil pieces by grouping each of the aluminum foil pieces described above may be to obtain at least one aluminum foil piece stack corresponding to the target aluminum foil by overlapping a plurality of aluminum foil pieces obtained from the target aluminum foil for each target aluminum foil layer; discard the aluminum foil pieces located at the top and bottom layers respectively in the plurality of aluminum foil piece stacks; and group the plurality of aluminum foil piece stacks into aluminum foil piece groups respectively to obtain a plurality of groups of aluminum foil pieces.

[0060] In some application scenarios, after obtaining a single target aluminum foil from an aluminum coil, the obtained single target aluminum foil is tightly wound to obtain multiple sub-aluminum coils. Alternatively, all target aluminum foils obtained by cutting may be wound into one to obtain a single sub-aluminum coil. In some application scenarios, after obtaining a single target aluminum foil by cutting, the single target aluminum foil obtained by cutting is tightly wound to obtain multiple sub-aluminum coils, each target aluminum foil is obtained by cutting from the aluminum coil, one of the sub-aluminum coils is unfolded and cut to obtain a stack of aluminum foil pieces, and then each of the next sub-aluminum coils is unfolded and cut to obtain a stack of aluminum foil pieces, and in this way, after obtaining stacks of aluminum foil pieces corresponding to all sub-aluminum coils, the operation is terminated, and all aluminum foil pieces in a stack of aluminum foil pieces are obtained by cutting from the same target aluminum foil. In some application scenarios, all target aluminum foils obtained by cutting are tightly wound to form a sub-aluminum coil, and then the sub-aluminum coil is unfolded and cut to obtain several stacks of aluminum foil pieces, wherein each aluminum foil piece in each stack of aluminum foil pieces is obtained by cutting different aluminum foil pieces.

[0061] Since the oil on the surface of the aluminum foil piece at the bottom layer of each aluminum foil piece stack may peel off or have foreign substances attached, affecting the initial weight, and the oil on the surface of the aluminum foil piece at the top layer may volatilize or have foreign substances attached, affecting the initial weight, the aluminum foil at the top and bottom layers of each stack is discarded to ensure the accuracy of the oil amount measurement, and then at least some of the aluminum foil piece stacks are stacked to obtain one group of aluminum foil pieces, thereby allowing multiple groups of aluminum foil pieces to be obtained. For example, each group of aluminum foil pieces can be manufactured by the method described above, and its weight can be determined based on the maximum oil amount when determining the relationship of oil amount change.

[0062] In the solution described above, the accuracy of measuring the amount of aluminum foil oil to be measured can be ensured by obtaining a stack of multiple aluminum foil pieces, discarding the aluminum foil pieces that are likely to be contaminated located at the top and bottom layers of each aluminum foil piece stack, and then grouping them into multiple groups of aluminum foil pieces.

[0063] In some embodiments, a plurality of aluminum foil pieces obtained by cutting are stacked to obtain a stack of aluminum foil pieces; when each target aluminum foil is all cut, the aluminum foil pieces located at the top and bottom of each group of aluminum foil pieces are discarded to obtain a plurality of groups of aluminum foil pieces.

[0064] In the above-described solution, stacks of aluminum foil pieces obtained by cutting are arranged in a stacked manner, and after cutting for all target aluminum foils is completed, aluminum foil pieces that may be contaminated at the top and bottom layers of each aluminum foil piece stack are discarded, thereby ensuring the accuracy of the measurement of the target aluminum foil oil amount.

[0065] In some embodiments, the step of obtaining the oil amount of the aluminum foil to be measured based on the weight difference between the initial weight and the target weight includes: obtaining a ratio between the weight difference and the initial weight; determining a first multiplication value of the ratio and the thickness of a plurality of groups of aluminum foil pieces; determining a second multiplication value obtained by multiplying the first multiplication value by the density of the aluminum foil pieces as the oil amount of the plurality of groups of aluminum foil pieces, and determining the oil amount of the plurality of groups of aluminum foil pieces as the oil amount of the aluminum foil to be measured.

[0066] Optionally, among multiple groups of aluminum foil pieces, each group of aluminum foil pieces has one initial weight and one target weight, that is, each group of aluminum foil pieces determines one oil amount based on its respective initial weight, target weight, thickness, and density, and the maximum oil amount corresponding to each group of aluminum foil pieces can be determined as the oil amount of the aluminum foil to be measured. Alternatively, multiple groups of aluminum foil pieces are weighed collectively to obtain one initial weight and one target weight, thereby obtaining one oil amount, and directly determining this oil amount as the oil amount of the aluminum foil to be measured.

[0067] Specifically, the method for calculating the amount of aluminum foil oil can be referred to by formula (1).

[0068] Formula (1)

[0069] Here, means initial weight, and means the target weight after heating, and represents the thickness of the aluminum foil pieces of multiple groups, and represents the density of the aluminum foil.

[0070] In the solution described above, the amount of oil on the surface of the aluminum foil piece within a unit area can be determined by considering the thickness and density of the multiple aluminum foil pieces.

[0071] In some application scenarios, the aluminum foil to be measured is an aluminum coil, and first, a multilayer target aluminum foil is obtained, and then each target aluminum foil is cut to obtain multiple groups of aluminum foil pieces. A specific method for obtaining the multilayer target aluminum foil is as follows: two narrow strips are cut from the edge of the aluminum coil, and the narrow strip aluminum foil is torn and separated along the width direction to the opposite side of the aluminum coil. When the multilayer aluminum foil torn and separated from the aluminum coil is collected, approximately 20 to 30 layers of aluminum foil can be obtained, i.e., 20 to 30 layers of target aluminum foil can be obtained. The multilayer target aluminum foil is collected from the aluminum coil and tightly wound. In some embodiments, batch information can be set for each target aluminum foil to facilitate the recording of subsequent oil quantity measurement results.

[0072] Next, the following steps are performed on the wound aluminum foil to obtain multiple groups of aluminum foil pieces. 1. Flatten the aluminum foil coil sample and machine notches with a spacing of approximately 80 mm in the width direction. 2. Tear and separate the aluminum foil, which is approximately 80 mm x 80 mm in size; the tearing and separation method may be done manually or by cutting with a cutter mounted on the end of a robot arm. 3. Repeat steps 1 and 2 to obtain multiple stacks of aluminum foil in the horizontal direction, and sample according to the sequence 1-2-3-4-… shown in FIG. 4. Each stack is stacked together after removing the top and bottom layers, and the weight of one group is controlled to 30 to 40 g. 5. Repeat steps 1 to 4 to obtain three groups or multiple groups per aluminum foil coil. For example, the method of cutting the target aluminum foil for each layer can be done by cutting the center area of ​​the target aluminum foil with reference to FIG. 4 to obtain several pieces of aluminum foil, and the center area refers to an area located at a certain distance from the edge of the target aluminum foil. For example, in FIG. 4, it is located 100 mm from the edge along the width direction and 50 mm from the edge along the length direction. Of course, the specific values ​​of the distance from the edge are merely examples, and in other embodiments, they may be different values. For example, it is located 80-120 mm from the edge along the width direction and 30-70 mm from the edge along the length direction. Here, the sectioning of the center area is not specifically limited.

[0073] Here, after obtaining multiple groups of aluminum foil pieces, the electronic balance can be zeroed by first placing an auxiliary tool on a high-precision weighing dish before weighing the aluminum foil pieces. Then, the multiple groups of aluminum foil pieces are placed on the auxiliary tool. Here, to ensure weighing accuracy during weighing, the protective cover is closed, and the weight of the aluminum foil before baking Recorded as, here It is recorded in grams and retained up to 4 decimal places.

[0074] After weighing is completed, multiple groups of aluminum foil pieces are sequentially placed on a heating support. Each compartment of the heating support is a single receiving space, and one group of aluminum foil pieces is placed in each compartment. Next, the heating support is placed inside a muffle furnace, and the muffle furnace is heated from room temperature to 300°C (heating time ≤ 35 min). After reaching 300°C, baking can be performed for 1 hour. After baking for 1 hour, when the internal temperature of the furnace cools to approximately 150°C, the heating support is removed using heat-resistant gloves and tongs. The removed multiple groups of aluminum foil pieces are then cooled to room temperature, and weighing is performed. Specifically, the aluminum foil samples are removed from the heating support using tools such as tweezers, and the electronic balance is zeroed before measurement. Then, the multiple groups of aluminum foil pieces are placed on a tray, the protective cover is closed during weighing, and the weight of the aluminum foil after baking is... It is recorded, leaving up to 4 decimal places. Then, based on the formula (1) described above, the oil amount of each group is obtained, and the maximum oil amount can be selected and determined as the oil amount of the aluminum foil to be measured. Here, the results obtained according to different carbon coating methods are: carbon coating powder detachment aluminum foil oil amount > 12 mg / m² 2 , normal aluminum foil ≤ 12 mg / m² 2 Including, it fully meets the requirements for incoming aluminum foil inspection. At the same time, using the multi-value measurement method, it is not possible to distinguish between aluminum foil coated with carbon coating powder detachment and missing coating and normal aluminum foil.

[0075] Specific test results can be referenced from the instrument R&R (overlap) reports for oil quantity shown in Figs. 5 to 9. Fig. 5 is a dispersion component chart, indicating that the dispersion caused by the instrument is minimal and the dispersion between parts is large. Fig. 6 is an oil quantity-sample number (experimenter) correlation plot, where the sample number is the number of the aluminum foil being measured. As shown in Fig. 6, the deviation between the results obtained by different operators performing oil quantity measurements on different aluminum foils is small. Specifically, the horizontal coordinates 1 to 10 represent the results of experimenter 1 performing tests on samples numbered 1 to 10, the horizontal coordinates 11 to 20 represent the results of experimenter 2 performing tests on samples numbered 1 to 10, and the horizontal coordinates 21 to 30 represent the results of experimenter 3 performing tests on samples numbered 1 to 10. Fig. 7 is an R control chart (by experimenter), where UCL=2.911, =1.131, LCL=0, and Figure 8 is the Xbar control chart (per experimenter), where UCL=8.92, =7.77, LCL=6.61, and Figure 9 is the oil amount * experimenter diagram, and Figure 10 shows the oil amount measurement results for aluminum foil with carbon coating powder detachment and normal aluminum foil produced by manufacturers A to E. It can be clearly confirmed that the oil amount of aluminum foil with carbon coating powder detachment is significantly higher than the oil amount of normal aluminum foil.

[0076] When testing the method for measuring the oil content of aluminum foil provided in this embodiment, the test is conducted using different test methods. For example, different operators perform the method and measure the oil content of aluminum foil produced by different manufacturers to evaluate the repeatability and reproducibility of the method for measuring the oil content of aluminum foil, thereby demonstrating that the method for measuring the oil content of aluminum foil provided in this embodiment ensures repeatability and reproducibility.

Claims

Claim 1 A method for measuring the oil content of aluminum foil, comprising: a step of obtaining an initial weight of a plurality of aluminum foil pieces, wherein the plurality of aluminum foil pieces are obtained by cutting from the aluminum foil to be measured; a step of determining a target heating method for the plurality of aluminum foil pieces based on an oil content change relationship, and heating the plurality of aluminum foil pieces by controlling a heating device according to the target heating method, wherein the oil content change relationship includes the oil content of a plurality of aluminum foil pieces obtained according to at least one carbon coating method according to a plurality of heating methods; a step of obtaining a target weight of the plurality of aluminum foil pieces after heating is completed; and a step of obtaining the oil content of the aluminum foil to be measured based on the weight difference between the initial weight and the target weight. Claim 2 The method of claim 1, wherein the method for measuring the oil amount of the aluminum foil further comprises: a step of obtaining the oil amount for a plurality of heating methods of aluminum foil pieces obtained according to different carbon coating methods, wherein the heating method includes one or more heating parameters among a heating time, a heating time required, a heating temperature, a cooling time, and a method of arranging the aluminum foil pieces of the plurality of groups within the heating apparatus, wherein at least one heating parameter according to the different heating method is different; and a step of obtaining the relationship of oil amount change based on the oil amount for a plurality of heating methods of aluminum foil pieces obtained according to each carbon coating method. Claim 3 In paragraph 2, the carbon coating method includes omission coating and soaplock coating, and the oil amount change relationship includes a first oil amount change according to a plurality of heating methods of an aluminum foil piece obtained according to the omission coating and a second oil amount change according to a plurality of heating methods of an aluminum foil piece obtained according to the soaplock coating, and the step of determining the target heating method of the plurality of groups of aluminum foil pieces based on the oil amount change relationship comprises: determining a first heating method corresponding to the maximum oil amount among the first oil amount changes and determining a second heating method corresponding to the maximum oil amount among the second oil amount changes; and determining the target heating method based on the first heating method and the second heating method. Claim 4 A method characterized in that, in claim 3, the step of determining the target heating method based on the first heating method and the second heating method comprises: a step of determining the first heating method or the second heating method as the target heating method when the first heating method and the second heating method are the same; and, if the first heating method and the second heating method are different, a step of determining the weights of the first heating method and the second heating method, and performing weighted fusion of at least one heating parameter among the first heating method and the second heating method according to the weights to obtain the target heating method. Claim 5 A method characterized by further comprising: a step of determining weights for the first heating method and the second heating method based on the ratio between the oil amount obtained according to the first heating method and the second heating method according to claim 4; or a step of setting the weight of the heating method corresponding to the side with the larger oil amount to 1 when the difference value between the oil amount obtained according to the first heating method and the second heating method is greater than or equal to a preset difference value - wherein the heating method with a weight of 1 is determined as the target heating method -; or a step of determining the weight of each of the heating parameters when there are at least two different heating parameters in the first heating method and the second heating method - wherein the weight between each of the heating parameters is preset or determined according to the ratio between the oil amount obtained according to the first heating method and the second heating method - Claim 6 A method according to any one of claims 1 to 5, wherein the heating device is provided with a first receiving space, the first receiving space is used to arrange the plurality of groups of aluminum foil pieces, and the step of heating the plurality of groups of aluminum foil pieces by controlling the heating device according to the target heating method comprises: a step of gradually raising the temperature of the first receiving space within the heating device in which the plurality of groups of aluminum foil pieces are arranged to a target temperature within a first preset period; and a step of continuously heating for a second preset period according to the target temperature; wherein the first preset period is shorter than the second preset period. Claim 7 A method characterized by comprising: a step of heating the aluminum foil pieces of a plurality of groups in any one of claims 1 to 6, wherein the heating device is provided with a first receiving space, the first receiving space is used to arrange the aluminum foil pieces of a plurality of groups, and the step of heating the aluminum foil pieces of a plurality of groups by controlling the heating device according to the target heating method, wherein the step of arranging the aluminum foil pieces of different groups in different second receiving spaces within a heating support, wherein each of the second receiving spaces is independently configured in the heating support, and the aluminum foil pieces of each group are distinguished according to the acquisition time; and a step of arranging the heating support in the first receiving space of the heating device to heat the aluminum foil pieces of each group in the heating support. Claim 8 A method according to claim 7, wherein the second receiving space comprises a through groove formed by being surrounded by a plurality of side walls, and the through groove is used to place the aluminum foil pieces of each group. Claim 9 A method according to any one of claims 1 to 8, wherein the aluminum foil to be measured is an aluminum coil formed by winding, and the method further comprises: a step of obtaining a multilayer target aluminum foil from the aluminum foil to be measured; a step of obtaining a plurality of aluminum foil pieces from the center region of each layer of the target aluminum foil; and a step of grouping each of the aluminum foil pieces to obtain the plurality of groups of aluminum foil pieces. Claim 10 The method according to claim 9, wherein the step of grouping each of the aluminum foil pieces to obtain the plurality of groups of aluminum foil pieces comprises: a step of overlapping and arranging the plurality of aluminum foil pieces obtained from the target aluminum foil with respect to the target aluminum foil of each layer to obtain at least one aluminum foil piece stack corresponding to the target aluminum foil; a step of discarding the aluminum foil pieces located at the top and bottom layers, respectively, of the plurality of aluminum foil piece stacks; and a step of grouping the plurality of aluminum foil piece stacks into aluminum foil piece groups to obtain the plurality of groups of aluminum foil pieces. Claim 11 A method according to claim 9, further comprising the step of determining a method for obtaining a plurality of aluminum foil pieces from the aluminum foil subject to measurement based on the relationship of oil amount change. Claim 12 A method characterized in that, in any one of claims 1 to 11, the step of obtaining the oil amount of the aluminum foil to be measured based on the weight difference between the initial weight and the target weight comprises: a step of obtaining a ratio between the weight difference and the initial weight; a step of determining a first multiplication value of the ratio and the thickness of the plurality of aluminum foil pieces; and a step of determining a second multiplication value obtained by multiplying the first multiplication value by the density of the aluminum foil pieces as the oil amount of the plurality of aluminum foil pieces, and determining the oil amount of the plurality of aluminum foil pieces as the oil amount of the aluminum foil to be measured.

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