Specification for puncture resistance test of battery diaphragm testing machine

　Battery diaphragm testing machine adopts mechatronics design, mainly used for all kinds of metal, non-metal and composite materials for conventional mechanical performance index test. Can also be used for stretching, peeling, tearing, heat sealing, and other multi-item test function! Applicable to profile, aerospace, petrochemical, ceramic, waterproof coil, food, pharmaceutical packaging, geotextile, film, wire and cable, textile, fiber, rubber, film, wood, paper and other manufacturing and product quality supervision departments at all levels, but also suitable for teaching and demonstration in colleges and universities.

Puncture resistance is an important mechanical index to evaluate the properties of diaphragm materials, which can effectively reflect whether the diaphragm is prone to short circuit during assembly. Will blend of active material, carbon black, plasticizer and PVDF evenly coated on the metal foil, made of lithium battery electrode after high temperature vacuum drying, the surface from the mixture of active substances and carbon black particles and formed by the present uneven, so caught in the diaphragm of the positive and negative electrode materials, need to bear a lot of pressure, Therefore, diaphragm material should have strong puncture resistance to prevent short circuit caused by positive and negative contact of lithium battery

Battery diaphragm testing machine used for puncture resistance performance test, the sample is clamped in a fixed fixture, equipped with puncture needle moving fixture at a set speed to the sample, until the puncture sample, the dynamic fixture contains a force value sensor, can be real-time monitoring of the puncture process force value changes, so as to obtain the puncture force of the sample. In addition, the fixture is equipped with a displacement sensor to monitor the deformation of the sample.

Battery diaphragm testing machine puncture resistance test process

(1) Use a sampler to cut 5 samples from the surface of the battery diaphragm sample to be tested.

(2) Set the test speed, sample name, test times and other parameters on the equipment control software, clip the sample in a special fixture, and install the puncture needle. Click the "test" option to start the test. The puncture needle moves to Pierce the sample according to the set test speed. The device displays the change of force value in real time and reports the puncture force value at the end of the test.

(3) Repeat sample clamping and click test to test the puncture force values of the remaining 4 samples.

6. Test results

The puncture force test values of the five samples were 5.3N, 5.6N, 5.5N, 5.4N, and 5.3N, respectively. The puncture resistance of the tested battery diaphragm sample was 5.42N, the average of the test results of the five samples.