Lithium Battery Capacity Dividing Process: A Key Step To Ensure Battery Quality And Performance

In the production process of lithium batteries, the capacity dividing process is a key step to ensure stable battery quality and performance. Through a series of delicate processes, the battery is charged and discharged, data collected and analyzed to determine its capacity, internal resistance and other key parameters, thereby achieving accurate assessment and classification of battery quality.

1. Basic principles of volume fractionation process

Lithium battery capacity classification is based on the charging and discharging characteristics of the battery. By controlling the charging and discharging process, measuring the voltage, current and other parameters of the battery, the capacity and internal resistance of the battery are calculated. During the decapacity process, the battery undergoes multiple charge and discharge cycles to fully activate battery performance and obtain accurate data.

2. The role and importance of volume separation technology

1. Ensure product consistency and reliability: The capacity dividing process can screen out batteries with stable performance and reliable quality, making the final product highly consistent and reliable.

2. Extend battery cycle life: Excluding bad batteries can improve the cycle life of the overall battery pack and reduce overall performance degradation caused by individual battery problems.

3. Improve battery energy density: Combining batteries with similar capacities can maximize the energy density of the battery pack and meet the energy needs of different application scenarios.

3. Key steps in volume separation process

1. Formation treatment: The newly produced batteries are subjected to formation treatment, including small current charging and discharging, constant temperature and other steps, so that the chemical substances inside the battery can fully react and reach a stable state.

2. Capacity test: Use standard charging and discharging processes to measure the battery capacity under different conditions to obtain accurate capacity data.

3. Data analysis and screening: With the help of professional software systems, the test data is analyzed and processed, and batteries that meet the requirements are screened out according to the set standards.

4. Group assembly: Classify and assemble the batteries into battery packs according to their capacity, internal resistance and other parameters to ensure that the batteries in each battery pack have similar performance.

5. Quality inspection: Conduct comprehensive quality inspection on the assembled battery pack, including appearance inspection, performance testing, etc., to ensure that the product meets relevant standards.

4. Process

Formation---measure the voltage after formation----aging-----vacuum aging-----shaping, sealing----painting, cleaning--aging-----.Voltage classification-- --Polishing-----Primary Dividing----Re-Dividing For grade B and C (including low-voltage batteries) batteries that have been divided once, re-divide them according to the steps of the first division and divide them as above. The grades are classified; --- voltage measurement, internal resistance measurement, and thickness measurement are classified into warehouses ------ 14. Secondary classification.

5. Common sub-capacity cabinets

There are three common types of capacity distribution cabinets: cylindrical battery capacity distribution cabinets, aluminum shell battery capacity distribution cabinets, and soft-packed polymer capacity distribution cabinets. The internal structures of the three are almost the same, and they are all composed of control systems, load modules, data acquisition modules, etc. The composition is just that the fixtures are different. The cylinder and the aluminum shell are in contact with the upper and lower pins, while the polymer uses a gold-plated flat fixture to hold the tabs for charge and discharge testing.

According to different current sizes, they are divided into 5V3A\5V6A\5V30A\5V100A\5V120A and other models.

6. Accuracy requirements and technical challenges of volume fractionation process

In order to achieve high-quality lithium battery capacity classification, the accuracy of the capacity classification equipment is extremely high. The measurement accuracy of current and voltage and the accuracy of charge and discharge control will directly affect the accuracy of the capacitance results. At the same time, with the continuous development of battery technology, the capacity separation process is also facing the challenge of continuously improving accuracy and adapting to new technologies.

7. Conclusion

In short, the lithium battery capacity dividing process plays an indispensable role in ensuring battery quality and performance. By strictly controlling all aspects of the capacity dividing process, lithium battery products with consistent performance, reliability and stability can be produced to meet the needs of various application fields. In the future, with the continuous advancement of technology, the capacity separation process will continue to be optimized and improved to provide more powerful support for the development of the lithium battery industry.