1. The importance of OCV sorting
The OCV sorting link is a key step in the battery module production process. Its main purpose is to accurately classify the batteries according to their performance by measuring the open circuit voltage (OCV) of the battery to ensure that the performance of all cells in the battery module is similar. Thereby improving the overall performance and service life of the battery pack. The OCV sorting process is of great significance to the performance consistency, safety and service life of battery modules.
2. Working principle of OCV sorting process
In the OCV sorting process, it is first necessary to charge/discharge the square case batteries through a high-precision current source and voltage measurement system to obtain the open circuit voltage and internal resistance data of the batteries. These data are key indicators for evaluating cell performance. Subsequently, the built-in algorithm will analyze the cell performance to determine whether it meets quality requirements. Based on the analysis results, the sorting machine classifies the cells according to performance levels, and can achieve up to 10 or more groups of graded matches to ensure that the performance of the cells in the battery pack is highly consistent.
3. Technical characteristics of OCV sorting process
High-precision measurement: The OCV sorting process uses high-precision current source and voltage measurement systems to ensure the accuracy of measurement results. At the same time, some high-end equipment will also integrate electrochemical impedance spectroscopy (EIS) testing to more comprehensively evaluate the cell status.
Intelligent analysis algorithm: The built-in algorithm can perform big data analysis on battery cell performance, continuously optimize the sorting standards, and improve matching accuracy. This step involves big data processing and machine learning technology to ensure the accuracy and reliability of the sorting results.
High degree of automation: The OCV sorting process adopts automated processes to reduce human intervention and improve production efficiency. At the same time, the automated handling and packaging system ensures that the sorted cells can be accurately delivered to the corresponding workstation for subsequent assembly or packaging.
The system has strong traceability: the battery cell performance data tested by the system implements a database management model, is stored for a long time, and has strong traceability. With the data analysis function of the software, long-term monitoring and analysis of product performance and quality can be carried out to guide the improvement of R&D formulas and production processes.
4. The role of OCV sorting link
Improve battery performance consistency: Through strict sorting, cells with abnormal performance are eliminated to ensure that all cells in the battery pack have similar performance, extend battery cycle life, and improve overall output power and energy density.
Optimize production efficiency: Automated processes reduce human intervention, speed up production pace, reduce human errors, and improve overall production efficiency and quality control levels.
Reduce system costs: Accurate pairing reduces the complexity of compensation designs caused by battery inconsistencies, such as balancing circuits, thereby reducing costs at the system level.
Strengthen safety: eliminate potential faulty cells, reduce the risk of thermal runaway, and ensure the safety of the battery system.
