Solid-state battery moisture test optimization method

Abstract

The invention discloses a solid-state battery moisture test optimization method, which specifically comprises the following steps: S1, sample preparation: (1) integral cutting: performing integral cutting on a baked lithium battery pole piece and a diaphragm according to a certain size specification, and comprehensively considering the convenience of subsequent mixed test and the uniformity of moisture distribution in the selection of the cutting size; the invention relates to the technical field of solid-state battery production. Compared with a single measurement mode and a mixed measurement mode, the solid-state battery moisture test optimization method can perform moisture test on a plurality of samples at the same time, greatly reduces the operation times of weighing, placing, testing and the like of the samples, remarkably shortens the test time, improves the detection efficiency, can better adapt to the requirements of large-scale battery production, and is suitable for popularization and application. The mixed test mode reduces the usage amount of test consumables, such as a test crucible, and reduces the operation time and the power consumption of test equipment, thereby effectively reducing the test consumables and the electric charge cost.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state battery production, and in particular to a solid-state battery moisture testing optimization method. Background Art

[0002] Solid-state batteries are batteries that use solid electrodes and solid electrolytes. The anode material can be a composite of nanosilicon and graphite, and the cathode can be lithium manganese oxide, a lithium-rich manganese-based material, or a lithium-free cathode material. The electrolyte is a solid electrolyte with an energy density of 300-450 watt-hours / kg. Solid-state batteries replace the electrolyte and separator of traditional lithium-ion batteries with solid electrolytes, offering greater safety, higher energy density, and improved cycle performance. These batteries are becoming a major research and development direction for the next generation of power batteries. Solid electrolytes can be broadly divided into three categories: inorganic electrolytes, solid polymer electrolytes, and composite electrolytes. Due to their high power-to-weight ratio, solid-state batteries are ideal for electric vehicles. During the solid-state battery production process, the moisture content of lithium battery electrodes and separators is a key quality control indicator. Excessive moisture content can trigger a series of adverse reactions within the battery, such as electrolyte decomposition and degradation of electrode material performance, seriously affecting the battery's electrochemical performance, cycle life, and safety. Therefore, accurate and efficient moisture measurement of baked lithium battery electrodes and separators is crucial.

[0003] At present, the industry generally adopts a single measurement method to detect the moisture content of lithium battery electrodes and diaphragms. This traditional method has many disadvantages. First, single measurement is inefficient. Each sample needs to be weighed independently, placed in the test equipment, set test parameters, wait for the test to be completed and record data, etc. The whole process consumes a lot of time and manpower. With the expansion of battery production scale, this inefficient measurement method has been difficult to meet production needs and has become a bottleneck restricting the improvement of production efficiency. Secondly, the single measurement method has high costs in terms of consumables and energy consumption. Each measurement requires the use of independent test consumables, such as test crucibles, and the test equipment needs to continuously consume electricity during operation, which increases production costs. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a solid-state battery moisture testing optimization method, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a solid-state battery moisture test optimization method, specifically comprising the following steps: S1. Sample preparation: (1) Overall cutting: The baked lithium battery electrodes and diaphragms are cut as a whole according to certain size specifications. The selection of cutting size should take into account the convenience of subsequent mixed testing and the uniformity of moisture distribution; (2) Accurate weighing: Use a high-precision electronic balance to accurately weigh the cut electrode and diaphragm samples, record the weight data of each sample, and provide basic data for the calculation of moisture content in the subsequent mixed test process; S2. Mixed testing procedure: (1) Establish standard operating procedures: Establish a detailed and standardized mixed test standard operating procedure, clarify the specific requirements and precautions of each operation step, and ensure that different operators can maintain consistent operating methods when conducting mixed tests; (2) Sample mixing and weighing: According to the pre-set mixing test plan, multiple cut and weighed electrode and diaphragm samples are mixed. After the mixing is completed, the mixed samples are weighed again using a high-precision electronic balance and the total weight of the mixed samples is recorded; (3) Test parameter setting: According to the material characteristics of the electrode and diaphragm, the baking process and the previous moisture test experience, determine the appropriate test temperature and duration and other measurement step parameters. When setting the test parameters, sufficient preliminary experiments are required to verify the rationality and accuracy of the parameters; (4) Moisture test: Place the mixed and weighed sample in the moisture test equipment and perform the moisture test according to the set test parameters. During the test, pay close attention to the operating status of the test equipment to ensure that the test process proceeds smoothly. The test equipment should have a high-precision moisture detection function and be able to accurately measure the moisture content in the sample; S3. Data analysis: (1) Data collection: After the initial implementation of the mixed test mode, the moisture data obtained from the mixed test are collected. At the same time, the moisture data obtained by the previous single measurement method are collected as a comparison benchmark to ensure that the two sets of data are comparable in terms of sample source, baking process, test environment, etc. (2) Comparative analysis: Comparative analysis of mixed measurement data and individual measurement data is conducted, using statistical methods such as calculating the mean, standard deviation, relative error and other indicators to evaluate the accuracy and reliability of the mixed measurement data; (3) Result verification: Based on the results of comparative analysis, the accuracy and reliability of the mixed testing model were verified.

[0006] Preferably, in said S1 (1), the electrode and the diaphragm can be cut into square or circular sheets of similar size according to the material properties of the electrode and the diaphragm, the baking process and the requirements of the test equipment, to ensure that each cut sample has good consistency in area and thickness, so as to ensure the uniformity of moisture distribution and avoid affecting the accuracy of the mixed test results due to excessive local moisture differences. In said S1 (2), during the weighing process, it is necessary to ensure that the balance is in a horizontal state and there is no obvious airflow interference and vibration in the surrounding environment to ensure the accuracy of the weighing results.

[0007] Preferably, in said S2 (2), an appropriate method should be adopted during the mixing process, such as gently shaking or stirring, so that the sample is fully mixed and uniform to avoid sample aggregation.

[0008] Preferably, in S2 (3), the test temperature should be selected to fully volatilize the moisture in the sample without causing thermal damage to the sample itself. The test time should be reasonably set according to factors such as the moisture content of the sample, the test temperature, and the performance of the test equipment to ensure that the moisture can be completely volatilized and accurately detected.

[0009] Preferably, in said S3 (2), by comparing the average values ​​of the moisture content under the two measurement methods, it is determined whether the mixed measurement result is consistent with the single measurement result at the overall level; by calculating the standard deviation, the discrete degree of the mixed measurement data is analyzed and the consistency of the mixed measurement result is evaluated; by calculating the relative error, the deviation between the mixed measurement result and the single measurement result is evaluated.

[0010] Preferably, in said S3 (3), if there is no statistically significant difference between the mixed test data and the single measurement data, and the relative error is within an acceptable range, it means that the mixed test mode can meet the requirements of moisture testing and has high accuracy and reliability. If there is a significant difference, the mixed test program needs to be further optimized, such as adjusting the sample mixing method, test parameters, etc., and re-testing and data analysis until the mixed test results meet the requirements. Beneficial effects

[0011] The present invention provides a solid-state battery moisture testing optimization method. Compared with the existing technology, the solid-state battery moisture testing optimization method has the following advantages: Compared with a single measurement method, the mixed test mode can simultaneously test the moisture of multiple samples, greatly reducing the number of operations such as sample weighing, placement, and testing, significantly shortening the test time, improving detection efficiency, and better adapting to the needs of large-scale battery production. The mixed test mode reduces the use of test consumables, such as test crucibles, and reduces the operating time and power consumption of test equipment, thereby effectively reducing the cost of inspection consumables and electricity bills, and improving the economic benefits of the enterprise. By formulating standard operating procedures, precise sample preparation, and rigorous data analysis, the mixed test data can be guaranteed to be accurate and reliable while improving detection efficiency. It has good consistency with the moisture data obtained by a single measurement method, providing reliable data support for the quality control of solid-state batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a flow chart of the steps of the present invention. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] See also Figure 1 The present invention provides a technical solution: a solid-state battery moisture test optimization method, which specifically includes the following steps: S1. Sample preparation: (1) Overall cutting: The baked lithium battery electrodes and diaphragms are cut as a whole according to certain size specifications. The selection of cutting size should take into account the convenience of subsequent mixed testing and the uniformity of moisture distribution; (2) Accurate weighing: Use a high-precision electronic balance to accurately weigh the cut electrode and diaphragm samples, record the weight data of each sample, and provide basic data for the calculation of moisture content in the subsequent mixed test process; S2. Mixed testing procedure: (1) Establish standard operating procedures: Establish a detailed and standardized mixed test standard operating procedure, clarify the specific requirements and precautions of each operation step, and ensure that different operators can maintain consistent operating methods when conducting mixed tests; (2) Sample mixing and weighing: According to the pre-set mixing test plan, multiple cut and weighed electrode and diaphragm samples are mixed. After the mixing is completed, the mixed samples are weighed again using a high-precision electronic balance and the total weight of the mixed samples is recorded; (3) Test parameter setting: According to the material characteristics of the electrode and diaphragm, the baking process and the previous moisture test experience, determine the appropriate test temperature and duration and other measurement step parameters. When setting the test parameters, sufficient preliminary experiments are required to verify the rationality and accuracy of the parameters; (4) Moisture test: Place the mixed and weighed sample in the moisture test equipment and perform the moisture test according to the set test parameters. During the test, pay close attention to the operating status of the test equipment to ensure that the test process proceeds smoothly. The test equipment should have a high-precision moisture detection function and be able to accurately measure the moisture content in the sample; S3. Data analysis: (1) Data collection: After the initial implementation of the mixed test mode, the moisture data obtained from the mixed test are collected. At the same time, the moisture data obtained by the previous single measurement method are collected as a comparison benchmark to ensure that the two sets of data are comparable in terms of sample source, baking process, test environment, etc. (2) Comparative analysis: Comparative analysis of mixed measurement data and individual measurement data is conducted, using statistical methods such as calculating the mean, standard deviation, relative error and other indicators to evaluate the accuracy and reliability of the mixed measurement data; (3) Result verification: Based on the results of comparative analysis, the accuracy and reliability of the mixed testing model were verified.

[0015] In the present invention, in S1 (1), the electrode and the diaphragm can be cut into square or circular sheets of similar size according to the material properties of the electrode and the diaphragm, the baking process and the requirements of the test equipment, to ensure that each cut sample has good consistency in area and thickness, so as to ensure the uniformity of moisture distribution and avoid affecting the accuracy of the mixed test results due to excessive local moisture differences. In S1 (2), during the weighing process, it is necessary to ensure that the balance is in a horizontal state and there is no obvious airflow interference and vibration in the surrounding environment to ensure the accuracy of the weighing results.

[0016] In the present invention, in S2 (2), an appropriate method should be adopted during the mixing process, such as gently shaking or stirring, to ensure that the sample is fully mixed and uniform, and to avoid sample aggregation.

[0017] In the present invention, in S2 (3), the test temperature should be selected to fully volatilize the moisture in the sample without causing thermal damage to the sample itself. The test time should be reasonably set according to factors such as the moisture content of the sample, the test temperature, and the performance of the test equipment to ensure that the moisture can be completely volatilized and accurately detected.

[0018] In the present invention, in S3 (2), by comparing the average values ​​of the moisture content under the two measurement methods, it is judged whether the mixed measurement result is consistent with the single measurement result at the overall level; by calculating the standard deviation, the discrete degree of the mixed measurement data is analyzed and the consistency of the mixed measurement result is evaluated; by calculating the relative error, the deviation between the mixed measurement result and the single measurement result is evaluated.

[0019] In the present invention, in S3 (3), if there is no statistically significant difference between the mixed test data and the single measurement data, and the relative error is within an acceptable range, it means that the mixed test mode can meet the requirements of moisture testing and has high accuracy and reliability. If there is a significant difference, the mixed test program needs to be further optimized, such as adjusting the sample mixing method, test parameters, etc., and re-testing and data analysis until the mixed test results meet the requirements.

[0020] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0021] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0022] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A solid-state battery moisture test optimization method, characterized by: The specific steps include: S1. Sample preparation: (1) Overall cutting: The baked lithium battery electrodes and diaphragms are cut as a whole according to certain size specifications. The selection of cutting size should take into account the convenience of subsequent mixed testing and the uniformity of moisture distribution; (2) Accurate weighing: Use a high-precision electronic balance to accurately weigh the cut electrode and diaphragm samples, record the weight data of each sample, and provide basic data for the calculation of moisture content in the subsequent mixed test process; S2. Mixed testing procedure: (1) Establish standard operating procedures: Establish a detailed and standardized mixed test standard operating procedure, clarify the specific requirements and precautions of each operation step, and ensure that different operators can maintain consistent operating methods when conducting mixed tests; (2) Sample mixing and weighing: According to the pre-set mixing test plan, multiple cut and weighed electrode and diaphragm samples are mixed. After the mixing is completed, the mixed samples are weighed again using a high-precision electronic balance and the total weight of the mixed samples is recorded; (3) Test parameter setting: According to the material characteristics of the electrode and diaphragm, the baking process and the previous moisture test experience, determine the appropriate test temperature and duration and other measurement step parameters. When setting the test parameters, sufficient preliminary experiments are required to verify the rationality and accuracy of the parameters; (4) Moisture test: Place the mixed and weighed sample in the moisture test equipment and perform the moisture test according to the set test parameters. During the test, pay close attention to the operating status of the test equipment to ensure that the test process proceeds smoothly. The test equipment should have a high-precision moisture detection function and be able to accurately measure the moisture content in the sample; S3. Data analysis: (1) Data collection: After the initial implementation of the mixed test mode, the moisture data obtained from the mixed test are collected. At the same time, the moisture data obtained by the previous single measurement method are collected as a comparison benchmark to ensure that the two sets of data are comparable in terms of sample source, baking process, test environment, etc. (2) Comparative analysis: Comparative analysis of mixed measurement data and individual measurement data is conducted, using statistical methods such as calculating the mean, standard deviation, relative error and other indicators to evaluate the accuracy and reliability of the mixed measurement data; (3) Result verification: Based on the results of comparative analysis, the accuracy and reliability of the mixed testing model were verified.

2. A solid-state battery moisture test optimization method according to claim 1, characterized in that: In said S1 (1), the electrode and the diaphragm can be cut into square or circular pieces of similar size according to the material properties of the electrode and the diaphragm, the baking process and the requirements of the test equipment, ensuring that each cut sample has good consistency in area and thickness to ensure the uniformity of moisture distribution and avoid affecting the accuracy of the mixed test results due to excessive local moisture differences. In said S1 (2), during the weighing process, it is necessary to ensure that the balance is in a horizontal state and there is no obvious airflow interference and vibration in the surrounding environment to ensure the accuracy of the weighing results.

3. The solid-state battery moisture test optimization method according to claim 1, characterized in that: In S2 (2), appropriate methods should be used during the mixing process, such as gentle shaking or stirring, to ensure that the sample is fully mixed and uniform to avoid sample aggregation.

4. The solid-state battery moisture test optimization method according to claim 1, characterized in that: In S2 (3), the test temperature should be selected to fully volatilize the moisture in the sample without causing thermal damage to the sample itself. The test time should be reasonably set according to factors such as the moisture content of the sample, the test temperature, and the performance of the test equipment to ensure that the moisture can be completely volatilized and accurately detected.

5. The solid-state battery moisture test optimization method according to claim 1, characterized in that: In said S3 (2), by comparing the average values ​​of the moisture content under the two measurement methods, it is determined whether the mixed measurement results are consistent with the individual measurement results at the overall level; by calculating the standard deviation, the dispersion of the mixed measurement data is analyzed and the consistency of the mixed measurement results is evaluated; By calculating the relative error, the deviation between the mixed measurement results and the individual measurement results can be evaluated.

6. The solid-state battery moisture test optimization method according to claim 1, characterized in that: In S3 (3), if there is no statistically significant difference between the mixed test data and the single measurement data, and the relative error is within an acceptable range, it means that the mixed test mode can meet the requirements of moisture testing and has high accuracy and reliability. If there is a significant difference, the mixed test program needs to be further optimized, such as adjusting the sample mixing method, test parameters, etc., and re-testing and data analysis until the mixed test results meet the requirements.

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