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A test method and test combination device for battery separator puncture resistance

A test method and technology for battery diaphragms, which are applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of insufficient accurate evaluation of the puncture resistance of the diaphragm, neglect of the impact of the puncture resistance of the diaphragm, etc., and achieve comprehensive puncture resistance, Simple operation and good detection repeatability

Active Publication Date: 2020-12-04
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characterization of the puncture resistance of the diaphragm in the prior art basically uses the ASTMF1306-90 film puncture strength standard test method to test the puncture resistance of the diaphragm. The test method is to test the puncture resistance of the diaphragm with a diameter of 3.2mm. Press vertically into the diaphragm fixed on the clamping device. The pressure when the diaphragm is pierced is recorded as the puncture resistance of the diaphragm. The diameter of the puncture indenter used in this test method is obviously larger than that of lithium dendrites in the battery, metal burrs on pole pieces or Hundreds of times of foreign matter particles, etc., and ignore the impact of battery process temperature or service temperature on the puncture resistance of the separator
It can be seen that this test method is to directly test the puncture resistance of the separator sample with a puncture indenter at room temperature. This test result is quite different from the actual situation, and it is not enough to accurately evaluate the actual puncture resistance of the separator in the battery.

Method used

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  • A test method and test combination device for battery separator puncture resistance
  • A test method and test combination device for battery separator puncture resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]In this example, the high-temperature puncture strength of a polyethylene wet-processed membrane with a thickness of 16 μm is tested, and the process of battery baking is simulated to test the puncture strength of the diaphragm during battery baking. The specific operation steps are as follows:

[0056](1) Place the 120mm×120mm diaphragm sample on the upper and lower sides of 100mm×100mm copper foil with tiny burrs covering 30%-40% of the surface area (the non-burr surface is coated with insulating layer or pasted with insulating glue) ), the particle size of the burr on the copper foil is 50-80 μm, the height of the protrusion is 50-80 μm, and the burr surface faces the diaphragm sample. Bond the wire to the copper foil (bonded to the side without insulation layer or insulation film) and connect it to the insulation resistance tester, and then place the copper foil and diaphragm together on the test platform in the high and low temperature universal testing machine for insulatio...

Embodiment 2

[0059]In this example, the high-temperature puncture strength of a polyethylene wet-processed membrane with a thickness of 16 μm is tested, and the process of battery baking is simulated to test the puncture strength of the diaphragm during battery baking. The specific operation steps are as follows:

[0060](1) Place the 120mm×120mm diaphragm sample between the upper and lower dry sanding papers of 100mm×100mm, where the sand paper is 40μm tungsten carbide, and the wires are bonded to the sand layer of the two dry sanding papers Attach and connect with the insulation resistance tester, then put two dry sanding paper and diaphragm samples together on the test platform in the high and low temperature universal testing machine, and the insulation resistance tester is placed outside the high and low temperature testing machine.

[0061](2) The diaphragm sample is allowed to stand for 30 minutes in the high and low temperature testing machine at 80℃, and then press the upper dry sanding paper...

Embodiment 3

[0063]In this example, the low-temperature puncture strength of a polypropylene dry-process separator with a thickness of 40 μm is tested, simulating the low-temperature use environment of the battery, and the puncture strength of the separator during low-temperature charging and discharging of the battery is tested. The specific operation steps are as follows:

[0064] (1) Place the 120mm×100mm diaphragm sample between the upper and lower dry sanding papers of 90mm×80mm, where the sand paper is 80μm titanium carbide, and the wires are bonded to the two dry sanding paper grit surfaces Connect with the insulation resistance tester, then put two dry sanding paper and diaphragm samples together on the test platform in the high and low temperature universal testing machine, and the insulation resistance tester is placed outside the high and low temperature universal testing machine.

[0065](2) The diaphragm sample is allowed to stand for 60 minutes in the high and low temperature universal t...

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Abstract

The invention relates to a testing method for puncture resistance capabilities of battery diaphragm. The method includes that a diaphragm sample is put between two plate electrodes to form a test piece, the surface of at least one plate electrode is provided with burrs and comprises a plurality of hard conductive particles protruding out of the surface, the diaphragm sample is correspondingly placed on the burred surface in a contact mode, and the two plate electrodes are electrically connected to two sides of an insulated resistance tester; the test piece is put in an environment with changeable and controllable temperatures, and the pressure value of forward extrusion of the plate electrodes is increased through external force; when the insulated resistance tester detects short circuit of the plate electrodes of the test piece, the pressure value, used for representing the puncture resistance capability of the diaphragm sample, at the moment is recorded. Preferably, two dry abrasivepapers with hard conductive alloy particles on the surfaces are substituted for the two plate electrodes. The invention further relates to a combined testing device applied to tests of the puncture resistance capabilities of the battery diaphragm.

Description

Technical field[0001]The invention relates to the technical field of batteries, in particular to a method for testing the puncture resistance of a battery diaphragm.Background technique[0002]The separator is one of the key internal components in the structure of the lithium battery. The performance of the diaphragm determines the interface structure and internal resistance of the battery, and directly affects the battery's capacity, cycle and safety performance. A diaphragm with excellent performance plays an important role in improving the overall performance of the battery. The popular description of the diaphragm is a porous plastic film, which is a high value-added material with the highest technical barrier among lithium battery materials, accounting for about 20%-30% of the cost of lithium batteries. The diaphragm divides the electrolysis chamber into a cathode area and an anode area, allowing lithium ions to migrate through, and prevent short circuit between the positive and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00
CPCG01N3/00
Inventor 郭丽媛娄忠良
Owner SOUNDON NEW ENERGY TECH CO LTD
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