Introduction of lithium battery testing equipment and performance test methods

What are the lithium battery testing equipment? As an important branch of the new energy automobile industry chain, the development of power lithium battery testing equipment is in a period of explosive rise. If you want to manufacture lithium battery cells and lithium-ion battery packs with high consistency, good stability, and excellent performance, testing equipment will play a vital role. The lithium-ion battery detection system industry has the characteristics of complex downstream technology, multiple production links and long processes. With the improvement of the automation of downstream lithium-ion battery manufacturing links and the establishment of intelligent manufacturing systems, the company’s data collection, analysis and forecasting of various nodes in the manufacturing process undertaken by the lithium-ion battery testing system, station control, feedback, and tracking problems, human-machine Intelligent interaction, high integration, intelligent production and other intelligent aspects have more urgent requirements. Laser Thickness Gauge: The coating type laser thickness gauge can be placed behind the coating head and in front of the oven to measure the thickness of the coated wet film; it can also be placed behind the oven and before rewinding to measure the thickness of the dry pole piece; roll pressure The type laser thickness gauge is placed after the pressing roll and before winding to measure the thickness of the pole piece after pressing. X/β-ray areal density measuring instrument: lithium ion battery positive and negative electrode coating, lithium ion battery separator coating, paper areal density measurement. When used in the coating process of lithium ion batteries, the equipment can be placed after unwinding of the coater and in front of the coating head to measure the areal density of the substrate to be coated; it can also be placed outside the oven, before rewinding, and measuring the surface density of the substrate to be coated. The surface density of the dried pole piece. Lithium-ion battery performance test method Lithium-ion battery is a product that requires high quality and high safety. Consumers often don’t know the performance of the battery when using it. As a result, the efficiency of the battery during use is often not up to the ideal goal, and sometimes it is used blindly. It will also cause the occurrence of battery explosions, and the safety of life will also be damaged. Therefore, it is important to understand the performance of the battery. Lithium-ion battery performance testing mainly includes voltage, internal resistance, capacity, internal pressure, self-discharge rate, cycle life, sealing performance, safety performance, storage performance, appearance, etc., as well as overcharge, overdischarge, solderability, and durability. Corrosion, etc. Method 1: Self-discharge testThe self-discharge test of lithium-ion batteries is: generally 24-hour self-discharge is used to quickly test its charge retention capacity, the battery is discharged at 0.2C to 3.0V, and constant current and constant voltage is charged to 4.2V at 1C. Cut-off current: 10mA, after 15 minutes of storage, discharge at 1C to 3.0V to measure the discharge capacity C1, then charge the battery at constant current and constant voltage 1C to 4.2V, cut-off current 100mA, and measure the 1C capacity C2, C2/ C1×100% should be greater than 99%. Method 2: Internal resistance measurement. The internal resistance of a lithium-ion battery refers to the resistance that the current flows through the battery when the battery is working. It is generally divided into AC internal resistance and DC internal resistance. Since the internal resistance of the rechargeable battery is very small, the DC In the case of internal resistance, since the electrode is easily polarized and the polarized internal resistance appears, its true value cannot be measured; and the AC internal resistance can be measured to avoid the influence of the polarized internal resistance, and the true internal value can be obtained. The AC internal resistance test method is: using the characteristics of a lithium-ion battery equivalent to an active resistor, giving the battery a constant current of 1000HZ, 50mA, sampling its voltage, rectifying, filtering and a series of processing to accurately measure its resistance. Method 3. Drop test After fully charged, the lithium-ion battery pack is dropped from three different directions on a hard rubber plate at a height of 1m. Do it twice in each direction. The battery pack's electrical performance should be normal and the outer packaging should not be damaged. Method 4. Impact test After the lithium-ion battery is fully charged, place a 15.8mm diameter hard rod on the battery, and use a 20-pound object to fall from a height of 610mm on the hard rod. The battery should not be Explosion, fire or leakage. Method 5, puncture experiment After the lithium-ion battery is fully charged, use a nail with a diameter of 2.0mm~25mm through the center of the battery and leave the nail in the battery. The battery should not explode and catch fire. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it.