With the continuous development of science and technology, batteries have become an indispensable part of modern life. Whether it's a mobile phone, a laptop or an electric car, you can't do without the support of batteries. And the performance and safety of the battery depends largely on its packaging material. Therefore, it is very important to carry out rigorous testing and evaluation of battery packaging materials.
High and low temperature tensile testing machines for battery packaging materials can be used to test the tensile properties of materials under extreme temperature conditions. This test is primarily used to evaluate the strength, toughness, and reliability of a material in low and high temperature environments to determine its suitability under extreme operating conditions. For battery packaging materials, high and low temperature tensile testing machines can help researchers understand the performance of materials at different temperatures, thus providing an important basis for battery design and optimization.
Before performing a high and low temperature tensile test, a sample of the separator used for tensile testing is first removed from a commercial lithium-ion battery (prismatic). The total length of all samples is 35 mm, and the parallel cross-section size is 10 (L) x 2 (W) mm. The diaphragm sample is then placed in a fixture and a tensile test is performed according to the set test temperature. Test data such as strain at break and tensile strength are recorded.
In one experiment, the physical properties of the diaphragm samples were tested at 25 °C and 60 °C, as well as at 60 °C and 90 °C. The results showed that when the test temperature was increased to 60°C, the strain at break value increased by a factor of 2, but the tensile strength decreased slightly. When the temperature is further increased to 90°C, the tensile strength decreases significantly, although the breaking strain maintains an increasing trend. These results show that the toughness of the separator material is improved with the increase of temperature, but its strength is affected to a certain extent.
By testing the tensile properties of separator samples at high and low temperatures, researchers can understand how the material behaves at different temperatures, which provides an important basis for battery design and optimization. For example, in high-temperature environments, the toughness of the separator material is improved, which means that the battery has better protection against external shocks. However, the safety of the battery may be compromised due to the reduced strength of the material at high temperatures. Therefore, when designing batteries, these factors need to be fully considered to ensure the performance and safety of batteries under various working conditions.
In addition to separator materials, battery packaging materials also include housings, seals and other components. These components also need to be subjected to high and low temperature tensile tests to ensure their performance and reliability under extreme temperature conditions. Rigorous testing and evaluation of these components supports the design and optimization of batteries.