Lithium ion battery diaphragm breakdown strength testing device and testing method thereof

A technology of lithium-ion battery and breakdown strength, which is applied in the direction of measuring device, testing dielectric strength, measuring device casing, etc., can solve the problem of large access, etc., and achieve the effect of simple operation, high test reliability and simple structure

Inactive Publication Date: 2020-04-28
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for testing the breakdown strength of a lithium-ion battery diaphragm in view of the large gap between the breakdown strength test method and the actual application in the prior art

Method used

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  • Lithium ion battery diaphragm breakdown strength testing device and testing method thereof
  • Lithium ion battery diaphragm breakdown strength testing device and testing method thereof
  • Lithium ion battery diaphragm breakdown strength testing device and testing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A device for testing the breakdown strength of a lithium-ion battery diaphragm, comprising an insulating working platform 6, a fixing clip 1 for fixing one end of a diaphragm sample 3, a splint 4 for fixing a fixed weight at the other end of the diaphragm sample 3, located at The movable electrode 2 on the upper surface of the diaphragm sample 3 and the fixed electrode 5 located on the lower surface of the diaphragm sample 3 , wherein the movable electrode 2 exerts downward pressure on the diaphragm sample 3 .

[0031] Make a strip-shaped diaphragm sample with a certain area. During the test, one end (longitudinal) of the diaphragm sample 3 should be fixed by the fixing clip 1, and the other end (longitudinal) should be connected to a splint 4 with a fixed weight. The splint can provide 80-500g to the diaphragm (longitudinal) Tensile force, the movable electrode 2 provides 0.8-1kpa pressure in the vertical direction to the diaphragm sample 1 on the fixed electrode 5 due ...

Embodiment 2

[0035] In this embodiment, the fixed electrode 5 is a copper rectangular sheet of 800mm*500mm*5mm (length*width*height), and the movable electrode 2 is cylindrical brass with a smooth surface, a thickness of 2mm, and a diameter of 30mm.

[0036] In this example, a wet-process base film sample made of 9 μm PE is tested, and the specific steps are as follows:

[0037] Step 1, from the same batch of products, a total of 2 diaphragm samples 3 with a length of 1000mm and a width of 300mm were produced;

[0038] Step 2, spreading the diaphragm sample 3 on the fixed electrode 5;

[0039] Step 3, use the diaphragm fixing clip 1 to fix one end of the diaphragm sample 3, and the other end hangs down naturally through the fixed rotating shaft, and uses the splint 4 with a weight of 300g to clamp the naturally hanging end of the diaphragm sample 3;

[0040] Step 4, after the splint 4 is stabilized, place the movable electrode 2 on the diaphragm sample 3;

[0041] Step 5, the movable ele...

Embodiment 3

[0049] On the basis of Example 2, a wet-process base film with a thickness of 12 μm was selected and tested by the same method. At the same time, the device and method with the notification number CN104090217A were used to test the 12 μm thick PE material wet-process base film for testing, and the results obtained were the breakdown data of Comparative Example 3 in Table 2.

[0050] Table 2 is the breakdown voltage data / KV that comparative example 3 and embodiment 3 obtain

[0051]

[0052]

[0053] The result of data processing is shown in Fig. figure 2 Shown, the CPK value of comparative example 3 is 1.003, and the CPK value of embodiment 3 is 1.801.

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Abstract

The invention discloses a lithium ion battery diaphragm breakdown strength testing device and a testing method thereof. The testing device comprises an insulating working platform, a fixing clamp arranged on the insulating working platform and used for fixing one end of a diaphragm sample, a fixed-weight clamping plate used for fixing the other end of the diaphragm sample, a movable electrode placed on the upper surface of the diaphragm sample, and a fixed electrode arranged on the insulating working platform and located on the lower surface of the diaphragm sample, wherein the movable electrode applies downward pressure to the diaphragm sample. The device and the method are closer to the actual application scene of the diaphragm, and are high in test reliability and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for testing the breakdown strength of lithium-ion battery diaphragms. Background technique [0002] Breakdown strength is an important performance index for assessing lithium-ion battery separators. The existing test method is to lay the lithium-ion battery separator flat and use electrical testing instruments to test its breakdown voltage. For example, the patent publication with the publication number CN104090217A A diaphragm breakdown voltage test device and test method have been proposed, but this method is quite different from the state of the diaphragm during use, and cannot effectively characterize the performance of the diaphragm breakdown strength, because in practical applications, lithium-ion battery diaphragms are not flat. In the paving state, it works under a certain tension state. There is a big difference between the data tested by the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R1/04
CPCG01R1/0408G01R31/1263
Inventor 袁海朝徐锋董世永
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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