How to judge whether the insulation performance of blue film tape is up to standard?
View product specifications and certifications
Specification parameters: firstly, check the insulation resistance and withstand voltage indicated in the product manual or package of the blue film adhesive tape. Generally, the insulation resistance of qualified blue film adhesive tape for battery energy storage will be several gigaohms or even higher. For example, the insulation resistance of high-quality products may reach more than 10000 megohms. If the insulation resistance is too low, it may not be able to effectively prevent current leakage, thus affecting the safety and performance of the battery.
Certification mark: Check whether the product has relevant electrical insulation certification, such as UL(Underwriters Laboratories) certification. UL certification is an authoritative certification of product safety by American Underwriters Laboratory. UL certified blue film tape, its insulation performance and other indicators are in line with the relevant safety standards to a certain extent. The product packaging bears UL certification mark, which shows that the adhesive tape has undergone rigorous testing and reached the specified requirements in terms of insulation performance.
Use insulation resistance tester
Test principle: The insulation resistance tester is a device specially used to measure the resistance value of insulation materials. It applies a certain DC voltage to both sides of the blue film tape, and then measures the weak current flowing through the tape, and calculates the insulation resistance according to Ohm's law (where is resistance, voltage and current).
Test method: Stick the blue film adhesive tape on a conductive plate (such as a metal plate) to ensure that there are no bubbles and gaps between the adhesive tape and the conductive plate, so as to simulate the bonding state in actual use. Then two test probes of the insulation resistance tester are connected to the other side of the adhesive tape and the conductive plate respectively. Set an appropriate test voltage (generally determined according to the product manual or relevant standards, such as 500V or 1000V), and wait for the tester to display a stable resistance value after starting the test. If the insulation resistance value obtained by the test meets the product specification requirements, then the blue film adhesive tape is qualified in terms of insulation resistance.
Voltage withstand test
Test equipment and methods: withstand voltage tester is required for voltage withstand test. Stick the blue film adhesive tape between two electrodes, one of which is connected to a high voltage power supply and the other is grounded. Gradually increase the voltage, and observe at what voltage the blue film tape will break down (that is, the current suddenly increases). For example, the rated withstand voltage of the blue film adhesive tape used in a specific battery energy storage system is 1000V, so the voltage should be able to rise to 1000V or even higher steadily during the test, and the adhesive tape will not be broken down, which indicates that the voltage withstand performance of the adhesive tape is up to standard.
Reference standard: Different battery systems and application scenarios have different requirements for voltage resistance of blue film adhesive tape. Generally, it is necessary to refer to the maximum working voltage of the battery and the possible overvoltage to determine the required voltage withstand level of the blue film tape. For example, in some high-voltage battery energy storage systems, the voltage withstand level of blue film tape may need to reach above 3000V V.
Practical application simulation test
Simulation environment construction: a small test platform for simulating battery energy storage system can be built in the laboratory. The blue film tape is used to connect the positive and negative electrodes of the battery or wrap the battery module, and it runs for a period of time in a simulated normal charging and discharging environment. Observe whether there is leakage, short circuit or other electrical faults in this process.
Long-term observation: This test may take a long time, such as weeks or even months, to observe the insulation performance changes of the blue film tape during long-term use. At the same time, it can also simulate some extreme environmental conditions, such as high temperature and high humidity, to see if the tape can still maintain good insulation performance under these conditions to prevent battery failure.