Additionally, as is the case for many other thin film materials, separator film is anisotropic and so is recommended to be tested in multiple different cutting/testing directions. Testing these materials in accordance to ASTM D882 can be very beneficial for quality control checks as well as in R&D when trying to determine the optimal separator film solution.
Safer and stronger separator material more effectively prevents contact between the anode and cathode, while thinner material helps reduce the weight of each battery and improve energy density. The most common material used for separator film is polyolefin, a polymer film that is strong enough to withstand the winding operation during assembly as well as uneven plating of lithium on the anode due to extensive use. Separator films are a critical part of lithium-ion and other liquid electrolyte batteries that separate the anode and cathode. Though ASTM D882 is not an official standard for testing EV battery separator films, this standard is being modified to evaluate the mechanical properties of these materials. The size of the chamber limits the maximum elongation that can be reached.Separator Film Testing for Electric Vehicle Batteries The chamber has internal electric heaters to maintain high temperatures, and external carbon dioxide is used as the coolant to lower temperatures. Inside the chamber, standard measurement devices are mounted, and the thermal monitored atmosphere is tested in the same way as it is at ambient temperature. This chamber allows traveling across the top and bottom of the chamber on the foundation and the crosshead of the Universal Tester. The Universal Test machine is equipped with a thermal chamber. Crosshead displacement or extensometer helps to determine the elongation and tensile modulus.Įlevated or Reduced Temperature Test Procedure: Many materials (especially thermoplastics) have different physical properties depending on ambient temperature, so testing materials at specified temperature values can simulate the design environment.įor ASTM D882 test samples are fastened to the grips of the Universal Tester and pulled until failure. The test speed and grip separation for ASTM D882 are dependent on the extension to the material breakage. The data are often used to define materials, design components that withstand application, and quality control check of materials. ASTM D882 tests generate a curve of stress-strain that is used to determine tensile modulus. Tensile tests measure the force needed to crack a sample and the extent to which the sample stretches or expands to that breaking point. Tensile Properties by ASTM D882 test is designed to determine the tensile characteristics of plastics as thin sheets and films.
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