Lithium battery diaphragm hole closure-diaphragm rupture temperature detecting device and test method thereof

Abstract

The invention discloses a lithium battery diaphragm hole closure-diaphragm rupture temperature detecting device and a test method thereof. The device comprises a cylindrical heating main plate, a cylindrical testing bottom plate, a lithium battery diaphragm, a heating controller, an electric heating rod, temperature measuring holes, a thermocouple, a resistance measurement hole, a resistance measuring sensor, a resistance measuring moving block, a heating moving block, a temperature measuring instrument, a resistance measuring instrument, a heating hole, an adjusting bolt, a spring, a circularsealing ring, rectangular heat dissipation holes and a bolt; and the cavity of the cylindrical testing bottom plate is sealed with the diaphragm. According to the use method, the heating rod is inserted into the heating hole, and temperature and internal resistance are displayed in real time on a computer; as the temperature of the heating rod increases, the temperature of the device rises, and when the temperature rises to be a certain value, the micropores of the diaphragm are gradually closed, and a resistance value rises rapidly, and it is judged that the micropores of the diaphragm are closed; and when the temperature continues to rise, the diaphragm ruptures, and the resistance value suddenly drops, and temperature at this moment is rupture temperature. The device and method of theinvention have the advantages of convenient use, real-time display, the synchronous change of internal resistance with temperature, and small error range.

Description

technical field [0001] The invention relates to a device capable of accurately detecting the closed cell-breakdown temperature of a lithium battery diaphragm and a testing method thereof. Background technique [0002] With the development of science and technology, lithium batteries have become the mainstream of power battery development. They have the advantages of high specific energy, wide operating temperature range, and stable discharge. However, there are still various safety hazards in the use process that restrict their development. Safety is a factor that must be considered for batteries, and the closed cell temperature and membrane rupture temperature of the separator are important indicators for the safety of lithium-ion batteries. The existing lithium battery is mainly composed of positive electrode, negative electrode, electrolyte and separator. The main function of the separator is to separate the positive electrode from the negative electrode, prevent the dire...

AI Technical Summary

Problems solved by technology

[0005] At present, the existing test devices and detection methods cannot guarantee the synchronization of temperature with the test volume, and cannot guarantee the accuracy of the detection temperature range; at the same time, most heating methods are to heat the test device in an oven, which is complicated and unsafe to operate, resulting in Most lithium battery diaphragm manufacturers cannot accurately measure the closed cell and membrane rupture temperature of the diaphragm, and the closed cell, membrane rupture temperature range and related parameters of the provided diaphragm products are not accurate enough, resulting in serious safety hazards in lithium battery products. Hidden danger

Images