The working principle of the battery module EOL (End of Line) test station is mainly to conduct comprehensive performance and safety testing of the assembled battery modules through a series of automated and semi-automated testing processes. The following is a detailed analysis of the working principle of the battery module EOL test station:
1. Test startup and identification
Scan code identification: Before the test starts, by scanning the QR code or barcode on the battery module, the test equipment can automatically obtain relevant information about the module, such as model, batch number, production date, etc.
Recipe call: Based on the information recognized by scanning the code, the test equipment will automatically call the preset test recipe (test program), which contains all test items and test standards for this model of module.
2. Automated testing process
Voltage collection: The test equipment will automatically collect the total voltage of the battery module and the voltage of the individual cells to evaluate the consistency and health of the voltage.
Temperature monitoring: Through the built-in temperature sensor or external temperature probe, the test equipment can monitor the temperature inside the battery module in real time to determine the thermal management performance of the module.
Internal resistance test: Use a dedicated internal resistance tester to calculate the internal resistance of the battery module by measuring the voltage and current changes of the battery module under specific conditions to evaluate its electrical performance.
Insulation withstand voltage test: Use a high-voltage tester to conduct insulation resistance and withstand voltage tests on the battery module to ensure that the insulation performance between the module and the shell and the module's ability to withstand high voltages meet safety standards.
Other performance tests: Depending on the requirements of the test formula, it may also include other performance test items such as capacity test, charge and discharge performance test, OCV and SOC determination records (self-discharge inspection).
3. Data analysis and judgment
Data recording: During the test process, all test data will be recorded in real time and saved in the test equipment.
Data analysis: After the test is completed, the test equipment will process and analyze the collected data, and compare it with the preset standard values to determine whether the battery module is qualified.
Result determination: Based on the results of data analysis, the testing equipment will automatically determine whether the battery module passes the EOL test. Qualified products will automatically flow into the next station for subsequent processing, while unqualified products will be automatically discharged or marked for subsequent processing.
4. Test report and feedback
Test report: The test equipment will also generate a detailed test report, including test time, test items, test data, judgment results and other information for subsequent quality traceability and analysis.
Feedback mechanism: If the battery module is found to be abnormal or unqualified during the test, the test equipment will issue an alarm or prompt message in time so that the operator can take timely measures to deal with it.
To sum up, the working principle of the battery module EOL test station is to conduct comprehensive performance and safety testing of the battery module through automated and semi-automated testing processes, and determine whether it is qualified or not based on the test results. This workflow ensures that battery modules can meet predetermined performance and quality standards before leaving the factory, providing consumers with safe and reliable battery products.
