Technical exchange in the field of batteries
Accurate battery health (SOH) assessment technology ：
Accurately assessing the health status of batteries is crucial for proper use and maintenance of batteries. The traditional SOH evaluation method based on a single parameter such as battery capacity and internal resistance has the problem of low accuracy. At present, some evaluation technologies that integrate multiple parameters have been developed, such as using electrochemical impedance spectroscopy (EIS) technology to measure the impedance characteristics of the battery at different frequencies, obtain the chemical reaction information inside the battery, and combine machine learning algorithms to establish a battery SOH prediction model, which can more accurately assess the health status of the battery. In addition, based on the method of big data analysis, the charging and discharging data, temperature data, etc. of the battery in different usage scenarios are collected, and the dynamic monitoring and accurate prediction of battery SOH are realized through data mining and analysis, providing a scientific basis for battery replacement and maintenance.
Safety detection of battery fast charging technology ：
With the increasing demand for fast battery charging in electric vehicles and other fields, the safety testing of fast charging technology has become key. During the fast charging process, the battery is prone to safety issues such as overheating and overvoltage. Through thermal imaging technology, the temperature distribution of the battery during the fast charging process is monitored in real time, whether there is local overheating, and the charging strategy can be adjusted in time once an abnormality is found. At the same time, high-precision voltage and current monitoring equipment are used to monitor the charging voltage and current of the battery in real time to prevent overvoltage and overcurrent. In addition, strict testing is also required for the electrical insulation performance and mechanical strength of fast-charging batteries to ensure the safety and reliability of the battery under fast-charging conditions.
Performance testing of new battery materials ：
New batteries such as solid-state batteries and sodium-ion batteries are emerging, and their material property testing is facing new challenges. For solid-state electrolytes of solid-state batteries, key properties such as ionic conductivity and interface compatibility should be tested. AC impedance spectroscopy and other methods were used to measure the ionic conductivity of solid electrolytes and evaluate the changes in their conductivity under different temperatures and pressures. Microscopic analysis methods such as scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to observe the interface structure and interaction between solid electrolytes and electrode materials, and to judge their interface compatibility. For the electrode materials of sodium-ion batteries, it is necessary to test their sodium storage capacity, cycle stability and other properties, and comprehensively evaluate the performance of new battery materials through constant current charge-discharge test, cyclic voltammetry test and other methods, so as to promote the development and application of new battery technology.
