Lithium ion production inspection equipment

Although ideally the internal resistance of a battery should be zero, there are many reasons in reality that can cause the existence of internal resistance. As the battery deteriorates, the internal resistance will increase. In the battery cell production line, defective products are detected by comparing the internal resistance of qualified products and products to be tested. Inject electrolyte into the battery cell and conduct internal resistance checks in various processes after packaging (charge and discharge tests, aging tests, shipment inspections, etc.). There are two methods for measuring internal resistance: alternating current method (AC-IR) and direct current method (DC-IR). The AC method is applicable for inspection of production lines. This article introduces "AC-IR". When using the AC method to measure the internal resistance of a battery cell, please use an AC resistance meter (battery tester) specifically designed for low resistance measurement. The AC resistance tester applies a constant current AC signal to the tested object. Detect the small voltage generated when a constant current is applied and calculate the resistance value.