Battery Management System (BMS) Battery Management System (BMS) is an...
Test procedure after fabrication of the pole piece
In the production process of lithium-ion battery, the quality of the pole chip, as the core component, directly affects the performance and safety of the battery. Therefore, once the pole piece is manufactured, a series of rigorous tests must be carried out to ensure that it meets the design requirements and industry standards. This paper will detail a series of test items and their importance after the fabrication of the pole piece.
Appearance inspection
Surface defects: Check the surface of the pole sheet for obvious defects such as scratches, bubbles, spots, which may affect the performance of the battery.
Size INSPECTION: Check whether the size (length, width, thickness) of the pole piece meets the design specifications to ensure that it is still suitable for the subsequent assembly process.
Coating uniformity: Observe whether the coating of the positive and negative materials is uniform. The uneven coating may lead to an increase in the internal impedance of the battery and affect its discharge performance.
Thickness measurement
The thickness of the pole sheet is critical to the energy density and overall performance of the battery. Use a sophisticated measuring tool, such as a laser thickness gauge, to measure the thickness of the pole piece to ensure that it is within allowable tolerances. Too thin thickness may lead to insufficient battery capacity, while too thick thickness may increase internal resistance and affect discharge efficiency.
Electrochemical test
Electrochemical performance test is the key link to test the performance of the pole piece, which mainly includes the following items:
Cyclic Voltammetry (CV)
Through cyclic voltammetry, it is possible to evaluate the Li-ion embedding and deembedding behavior of the pole sheet at different scan rates, thus understanding its electrochemical characteristics and reaction kinetics.
Charging and discharging test
Constant current charge and discharge test: measure its capacity and energy under the specified rate.
Multiple cycle test: evaluate the capacity attenuation of the pole chip after multiple charging and discharging, and judge its cycle stability.
Self-discharge test
The self-discharge test can help to understand the performance change of the pole chip in the long standing state and ensure that excessive capacity loss does not occur during the storage of the pole chip.
Thermal analysis
The thermal stability test is a necessary step to ensure the safety of the pole piece under high temperature conditions. Its thermal characteristics can be tested using devices such as differential scanning calorimetry (DSC) to assess the change in performance over a range of temperatures. In addition, thermal runaway testing can help analyze the performance of the pole piece under extreme conditions.
Environment adaptability testing
Batteries are used in a variety of environments, including extreme conditions such as high humidity, low temperature, and high temperature. To this end, the environmental adaptability test of the pole piece should be carried out, which mainly includes the following items:
High temperature and high humidity test: simulate the actual performance of the pole piece in high temperature and high humidity environment to check the tolerance of the pole piece.
Low temperature test: evaluate the discharge performance and capacity retention of the pole chip in a low temperature environment to ensure its normal operation in cold climate conditions.
Security testing
Safety testing is an integral part of the battery manufacturing process. The pole piece needs to be tested for short circuit, overcharge, puncture, and thermal shock to evaluate its safety and stability under extreme operating conditions. Ensure that no thermal runaway or other safety hazards occur during the use of the pole piece.
Data recording and analysis
All test results should be recorded and analyzed in detail for subsequent quality control and feedback. Through data analysis, potential production problems can be identified, production process can be optimized, and the basis for product quality improvement can be provided.
Conclusion
After fabrication, the performance, quality and safety of the polar chip can be comprehensively evaluated through a number of comprehensive tests. These tests not only ensure that the electrode meets the technical standards, but also ensure the overall performance of the lithium-ion battery is an important part. With the continuous progress of technology and changes in market demand, test methods and standards are constantly updated, manufacturers need to continuously improve the level of testing to meet higher requirements in the future.
Home energy storage product series
A lithium battery pack for home energy storage systems, which is compatible with solar panels and the sun The inverter can work together with the power grid to power household appliances, and it can also be used as a For off grid systems.
Extended reading
Shock and vibration testing of single cell batteries
Shock and vibration testing of single cell batteries With the...
THE ESSC Brand promise
Global supply
Our products sell well all over the world, covering many countries and regions, through the global logistics network, to provide customers with convenient purchasing experience.
Rigorous quality
We adhere to the highest quality control standards to ensure every product meets industry regulations and customer expectations, earning trust through consistent excellence.
Excellent service
With a customer-centric approach, we provide prompt responses, professional support, and personalized services, aiming to deliver the best user experience and long-term value.