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Humidity test of single cell
With the continuous pursuit of the performance and safety of single battery, humidity test has become an important part of evaluating the reliability of battery in humid environment. Humidity environment has a great impact on the performance of batteries, especially lithium-ion batteries, which may lead to abnormal chemical reactions, corrosion and security risks inside the battery. This article will introduce the operation process of the humidity test of the single battery, the required instruments and the matters needing attention.
the purpose of humidity test
Assess moisture resistance: Test the performance of the battery in a high humidity environment to understand the moisture resistance of the battery to ensure that it is not negatively affected by ambient humidity during use.
Safety identification: Check whether the battery has leakage, short circuit, expansion and other safety hazards under wet conditions to ensure the safety of users.
Performance evaluation: Analyze the impact of humidity on battery capacity, charging and discharging efficiency and other performance indicators to provide a basis for subsequent product improvement.
Compliance with standards: To ensure that the humidity tolerance of the battery meets the industry standards, providing a guarantee for market access.
the basic principle of humidity test
Humidity testing is mainly done by placing the battery in a controlled high humidity environment and monitoring the electrical performance changes of the battery in this environment. High humidity may cause leakage of electrolyte inside the battery, corrosion of materials and short circuit inside the battery and other problems, so the humidity test is very necessary.
Operation process of humidity test
Preparation
Ensure that the test area is safe and in compliance with relevant standards, and prepare the required test instruments and equipment.
Select humidity test equipment
Choose a high temperature and high humidity test chamber or humidity control equipment that can create and maintain the required high humidity environment, usually set between 80% and 100%.
Connect the battery
Install the single battery to be tested into the test equipment to ensure that the battery is in good contact with the humidity environment, so that it can effectively absorb the environmental moisture during the test process.
Set the test conditions
Determine the humidity and temperature Settings, usually for humidity testing, temperature and humidity need to be set at the same time, the common combination is 40°C/90%RH or 60°C/75%RH, depending on the specific needs.
Test it
Start the humidity test equipment, and let the battery be placed in the set high humidity environment for a certain period of time (usually several hours to several days). The test duration is determined according to the test standard and the battery type.
Monitor and record data
In the test process, the battery voltage, temperature, capacity and other parameters are regularly monitored and recorded to ensure the integrity and accuracy of the data.
End the test
After the test, the battery was gradually removed from the humidity environment to avoid "wet shock" caused by environmental changes.
Check the appearance of the battery to observe whether there is corrosion, leakage, expansion and other phenomena.
Data analysis and report
The data recorded during the test were collected and analyzed to evaluate the performance change of the battery in a high humidity environment.
Write a detailed test report to clarify the performance of the battery in wet environment and the potential safety hazards.
Required instruments and equipment
High temperature and humidity test box
It is mainly used to simulate the high humidity environment, can accurately control the temperature and humidity, and is suitable for the humidity test of single battery.
Data logger
It is used to record voltage, temperature and humidity data in real time during the test process to ensure the data integrity of the test process.
Battery Tester
An instrument used to measure electrical properties such as battery capacity and internal resistance.
Temperature sensor
Temperature and humidity changes in the test environment and on the battery surface were monitored to ensure the accuracy of the test.
Protective equipment
Safety glasses, insulated gloves and protective clothing are included to ensure the safety of operators during testing.
Precautions
Security Guarantee:
Pay close attention to the battery status during the test and deal with any abnormal phenomenon in time to ensure the safety of personnel.
Avoid rapid changes:
Do not suddenly change the temperature and humidity of the test environment to avoid causing damage to the battery.
Equipment calibration:
Ensure that the humidity chamber and other test equipment are calibrated before testing to ensure the accuracy of the data.
Environmental Control:
In the test process, try to avoid the interference of the external environment, keep the laboratory dry and clean, and ensure the reliability of the test data.
Further processing:
After the test, properly dispose of damaged or leaked batteries and follow relevant environmental regulations to ensure safety and environmental protection.
Conclusion
Humidity testing is a key step to evaluate the performance and safety of single cells in humid environments. Through the standardized test process and professional test equipment, it can effectively identify the potential problems of batteries in high humidity environment, and provide strong support for the improvement and safe use of products. Ensuring the scientific and safety of the test can not only improve the performance and reliability of the battery, but also lay a solid foundation for its application in the market.
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