Global Battery Film Material Summit 2017 took place on June 15, 2017 in Shanghai. Labthink and other well-known enterprises are invited to the summit and held a discussion on the prospect of diversity and functionality of battery film materials and technical difficulties. A package of solutions to performance control of Li-ion battery film materials were released in the summit.
As the core part of Li-ion battery, diaphragm is made of microporous film, which allows the passage of Li-ion and meanwhile separate the positive electrode from negative electrode. In case of poor circulation or excessive circulation of Li-ion, or when the diaphragm is punctured through, the battery may explode due to short circuit, which may seriously affect the safety of human being. Labthink has its own solution for performance control of battery film materials, which can guarantee the safety of Li-ion battery.
Monitoring the circulation of Li-ion through the diaphragm
The circulation of li-ion is mainly determined by the microporous structure of diaphragm. Micropore is just like a road. Diameter and quantity of micropores decide the circulation of li-ion. However, processing technique, film material and film thickness are also the factors that may influence circulation of li-ion.
How to monitor the circulation of li-ion? Based on the common knowledge of battery industry, Labthink developed BTY-B2P Gas Permeability Tester, which is professionally applicable to the determination of gas permeability of battery diaphragm. The gas permeability can represent the circulation of li-ion through battery diaphragm. BTY-B2P has three test cells, which allows three test specimen tests simultaneously. The average Gurley value (Under 1.22kpa, testing the time cost by 100ml of oxygen permeating through the diaphragm of 1 square inch) of three test results will be given accurately and efficiently.
Ensuring the durability of diaphragm
he surfaces of positive and negative electrodes of the li-ion battery may be not smooth due to the accumulation of active substances and other particles. The diaphragm between the electrodes may be punctured through after long time compression and friction.
When the charger is misused or malfunctioned, too much li-ion will move from the positive electrode to negative electrodeand form sediments on the surface of negative electrode and eventually form lithium dendrites, which may puncture the diaphragm and cause short circuit.
Labthink recommended establish regular testing system for mechanical property of battery diaphragm to avoid the safety risks mentioned above. The tensile strength and puncture resistance are two main test items, which can guarantee the durability of diaphragms.
Labthink developed XLW Auto Tensile Tester, which can be used to test various items including tensile strength, peel strength and puncture resistance, etc. with multiple load cell ranges and various test speeds. Moreover, the user can select more than 100 sample grips according to their actual requirements.
Labthink Instruments Co., Ltd is always dedicated to helping the customers solve packaging problems and leading the technical innovation of packaging testing in packaging industry through improvement of packaging techniques and development of high-end testing instruments.