CN111998777B - Diaphragm liquid injection wrinkling test device and evaluation method - Google Patents
Diaphragm liquid injection wrinkling test device and evaluation method Download PDFInfo
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- CN111998777B CN111998777B CN202010914533.6A CN202010914533A CN111998777B CN 111998777 B CN111998777 B CN 111998777B CN 202010914533 A CN202010914533 A CN 202010914533A CN 111998777 B CN111998777 B CN 111998777B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The application provides a diaphragm is annotated liquid and is wrinkled testing arrangement includes: a dimensional measurement assembly and a diaphragm infiltration assembly; the diaphragm infiltration assembly comprises a first transparent panel, a second transparent panel and a sealing assembly, the first transparent panel and the second transparent panel are overlapped and arranged, the sealing assembly is detachably arranged around the first transparent panel and the second transparent panel, and an infiltration cavity for infiltrating the diaphragm is formed among the first transparent panel, the second transparent panel and the sealing assembly. The device can measure the size of the swollen diaphragm in the infiltration state, avoids the error between the size of the swollen diaphragm and the size of the real immersed diaphragm, and improves the accuracy of liquid injection and wrinkling evaluation of the diaphragm. Simultaneously, the application also provides an evaluation method for the diaphragm liquid injection wrinkling, which can be used for evaluating the wrinkling degree of the diaphragm before the battery is assembled, and is convenient to operate and short in time consumption in the evaluation process.
Description
Technical Field
The application relates to the field of battery diaphragms, in particular to a diaphragm liquid injection wrinkling testing device and an evaluation method.
Background
The lithium ion battery consists of a positive electrode, a negative electrode, a diaphragm and a shell, wherein the diaphragm is used for isolating the positive electrode and the negative electrode, preventing short circuit and allowing lithium ions to smoothly pass through the diaphragm. The diaphragm needs to be assembled with the positive electrode and the negative electrode, then the diaphragm is placed into a battery shell, electrolyte is injected into the battery shell, after the electrolyte is injected, the diaphragm, particularly a dry diaphragm, can swell under the action of the electrolyte, so that the diaphragm wrinkles, the wrinkling position of the diaphragm can cause thickness increase, ion passage is blocked, ion conduction is affected, and meanwhile, the increase of internal resistance can cause heating of the battery, and the battery explodes seriously. Therefore, the degree of wrinkling of the separator after liquid injection needs to be evaluated before use in order to avoid damage to the battery due to wrinkling of the separator.
Generally, in order to know whether the diaphragm liquid injection is wrinkled or not, the positive electrode, the diaphragm and the negative electrode are sequentially overlapped and then wound into a battery shell, electrolyte is injected into the battery shell and sealed, the battery is disassembled after the diaphragm and the electrolyte are completely soaked, the overlapped wound body is unfolded, the positive electrode or the negative electrode is taken down, whether the diaphragm is wrinkled or not is observed, and the wrinkling performance of the diaphragm is judged according to the number of wrinkling positions and the wrinkling degree visually. The crinkling evaluation method has the defects of non-uniform standard and large visual evaluation error, and cannot evaluate the crinkling degree of the diaphragm before assembling the battery. Meanwhile, after the battery is disassembled, the electrolyte can be volatilized rapidly, so that the wrinkling position and the wrinkling degree are difficult to see visually, and the soaked diaphragm is difficult to accurately measure the size of the soaked diaphragm due to the fact that the diaphragm shrinks caused by volatilization of the electrolyte, and has a large error. Therefore, a unified, convenient and quick diaphragm injection wrinkling test method is urgently needed to be researched to overcome the problems in the existing evaluation method.
Disclosure of Invention
An object of the application is to provide a testing arrangement that liquid was wrinkled is annotated to diaphragm to the realization is measured the size of diaphragm under the condition of soaking, avoids the measuring error that solvent volatilizees and cause.
Another objective of the present application is to provide an evaluation method for membrane liquid injection wrinkling, which has uniform standards, and can evaluate the wrinkling degree of a membrane before assembling a battery, thereby avoiding errors caused by intuitive evaluation of wrinkling performance.
The application is realized by adopting the following technical scheme:
in a first aspect, the present application provides a device for testing liquid injection wrinkling of a membrane, comprising:
the size measuring component is used for measuring the sizes of the front diaphragm and the rear diaphragm after infiltration;
the membrane infiltration assembly is used for carrying out infiltration treatment on the membrane;
the diaphragm infiltration assembly comprises a first transparent panel, a second transparent panel and a sealing assembly, the first transparent panel and the second transparent panel are overlapped and pressed, the sealing assembly is detachably arranged around the first transparent panel and the second transparent panel, an infiltration cavity for infiltrating the diaphragm is formed among the first transparent panel, the second transparent panel and the sealing assembly, and a liquid injection port for injecting impregnation liquid into the infiltration cavity is formed in the sealing assembly.
Further, in the preferred embodiment of the present application, the sealing assembly further has an exhaust port, and preferably, the exhaust port is connected to the pressure reducing device to accelerate the exhaust speed of the diaphragm.
Further, in the preferred embodiment of the present application, the dimension measuring component comprises one of a two-dimensional imager, a grating range finder or an infrared range finder; and/or the transparent panel is one or more of a glass panel, an acrylic panel and a polypropylene reinforced plastic plate; and/or the sealing component is one of an elastic rubber sealing ring or an annular sealing cover plate.
In a second aspect, the present application also provides a method for evaluating liquid injection wrinkling of a diaphragm by using the above apparatus, comprising:
s1, measuring the size of the diaphragm by adopting a size measuring assembly to obtain the size of the diaphragm before infiltration;
s2, placing the diaphragm in the infiltration cavity for infiltration treatment;
s3, measuring the size of the diaphragm in the infiltration state in the infiltration cavity by adopting a size measuring component to obtain the size of the infiltrated diaphragm;
s4 uses the dimensional changes of the diaphragm before and after wetting to evaluate the degree of wrinkling of the diaphragm.
Further, in the preferred embodiment of the present application, step S1 includes:
s11, flatly laying the diaphragm on the first transparent panel, flatly laying the second transparent panel on the diaphragm, and installing the sealing assembly, so that the diaphragm is arranged in the infiltration cavity;
s12, measuring the size of the diaphragm in the infiltration cavity to obtain the size of the diaphragm before infiltration.
Further, in the preferred embodiment of the present application, step S11 further includes performing a static discharge operation on the membrane after the membrane is laid on the first transparent panel and before the second transparent panel is laminated on the membrane.
Further, in the preferred embodiment of the present application, step S2 includes:
s21, injecting impregnating solution into the infiltration cavity from the liquid injection port; preferably, the impregnation liquid is injected into the impregnation chamber until the impregnation chamber is filled with the impregnation liquid.
S22 infiltrating the diaphragm in the infiltration chamber;
preferably, the impregnation liquid is injected into the infiltration chamber from the liquid injection port, and the exhaust treatment is performed at the same time.
Further, in the preferred embodiment of the present application, the degassing treatment includes degassing the diaphragm by a scraping treatment and/or a pressure reduction treatment; preferably, an exhaust port is provided in the seal assembly and the infiltration chamber is evacuated and depressurized with a pressure reduction device.
Further, in the preferred embodiment of the present application, the immersion treatment is performed under pressure; and/or the time of the infiltration treatment is 5-30min, preferably 10-15 min.
Further, in the preferred embodiment of the present application, the impregnation liquid is one or a mixture of several of dimethyl carbonate, ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate.
Compared with the prior art, the diaphragm liquid injection wrinkling testing device and the evaluation method provided by the preferred embodiment of the application have the beneficial effects that:
according to the diaphragm liquid injection wrinkling testing device and the evaluation method, the device can measure the size of the swollen diaphragm in an infiltration state, so that the error between the size of the swollen diaphragm and the size of the real infiltrated diaphragm is avoided, and the diaphragm liquid injection wrinkling evaluation accuracy is improved. Meanwhile, the evaluation method can be used for evaluating the wrinkling degree of the diaphragm before the battery is assembled, and is convenient to operate and short in time consumption in the evaluation process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.
FIG. 1 is a schematic diagram of a test device for membrane injection wrinkling in an example of the present application;
fig. 2 is a schematic diagram of the internal structure of a testing device for liquid injection wrinkling of a diaphragm in an example of the present application.
Icon: 1-a separator; 2-a sealing assembly; 3-liquid injection port; 4-an exhaust port; 5-a first transparent panel; 6-second transparent panel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
The lithium ion battery consists of a positive electrode, a negative electrode, a diaphragm and a shell, wherein the diaphragm is used for isolating the positive electrode and the negative electrode, preventing short circuit and allowing lithium ions to smoothly pass through the diaphragm. However, the separator, especially the dry separator, may swell under the action of the electrolyte, thereby causing the separator to wrinkle, and the wrinkled position of the separator may cause an increase in thickness, so that the passage of ions is blocked, thereby affecting the ion conduction. Therefore, the degree of wrinkling of the separator after liquid injection needs to be evaluated before use in order to avoid damage to the battery due to wrinkling of the separator.
At present, the evaluation method of the liquid injection wrinkling performance of the diaphragm generally comprises the steps of adding electrolyte to soak the diaphragm after the diaphragm is assembled in a battery, and taking out the diaphragm for observation after the diaphragm is completely soaked, so that the liquid injection wrinkling performance of the diaphragm is obtained. However, the above test requires assembly and disassembly of the battery, and the test process is cumbersome and cannot evaluate the degree of wrinkling of the separator before assembling the battery.
Meanwhile, in the evaluation method, the diaphragm is generally required to be taken out of the battery when the size of the soaked diaphragm is measured, and the electrolyte is generally volatile solvent, so that the electrolyte soaked on the diaphragm can volatilize in the process of taking out the diaphragm by disassembling the battery, the swelling phenomenon of the diaphragm is slowed down, errors exist between the size of the soaked diaphragm obtained through subsequent tests and the real size of the soaked diaphragm, and the subsequent evaluation result is inaccurate. Particularly for the winding battery, the battery core needs to be unfolded in the process of taking out the diaphragm, the time is long, so that a large amount of solvent in the diaphragm is volatilized, and the diaphragm is shrunk seriously.
To the problem that exists among the diaphragm liquid injection wrinkling test process, the application provides a diaphragm liquid injection wrinkling's testing arrangement, soaks the subassembly including size measurement subassembly and diaphragm. The device can measure the size of the swollen diaphragm in an infiltration state, so that the error between the size of the swollen diaphragm and the size of the real immersed diaphragm is avoided, and the accuracy of the evaluation of liquid injection and wrinkling of the diaphragm is improved; simultaneously, testing arrangement can be used for evaluating the degree of wrinkling of diaphragm before the equipment battery, and the simple operation is short consuming time among the evaluation process.
Specifically, the size measuring assembly is mainly used for measuring the sizes of the diaphragm before and after infiltration, and the liquid injection wrinkling performance of the diaphragm is evaluated by comparing the changes of the sizes of the diaphragm before and after infiltration. The dimensional measurement assembly is a length measurement device commonly used in the art, and any device capable of performing measurements of the length and width of the diaphragm may be used as the dimensional measurement assembly of the present application, such as, but not limited to, a two-dimensional imager, a grating rangefinder or an infrared rangefinder.
The diaphragm infiltration assembly comprises an infiltration cavity for infiltrating the diaphragm, and the diaphragm can be infiltrated in the infiltration cavity; the infiltration cavity can apply force to the diaphragm in the infiltration treatment process, so that the diaphragm is fully unfolded, and the phenomenon that the diaphragm cannot be fully infiltrated due to the curling of the diaphragm in the infiltration process is avoided; after the diaphragm is soaked, the size of the soaked diaphragm can be directly measured by using the size measuring assembly, so that the accuracy of evaluation of liquid injection and wrinkling of the diaphragm is improved.
Referring to fig. 1 and 2, the diaphragm assembly may include a first transparent panel 5, a second transparent panel 6, and a sealing assembly 2. Wherein the first transparent panel 5 and the second transparent panel 6 are arranged to overlap each other, the sealing assembly 2 is detachably arranged around the first transparent panel 5 and the second transparent panel 6, so that a sealed infiltration chamber is formed between the first transparent panel 5, the second transparent panel 6 and the sealing assembly 2.
The transmission of the shooting light of the quadratic element imager can be guaranteed by using the two transparent panels in the application, and the measurement accuracy is favorably improved.
The diaphragm in the impregnation chamber can be forced in various ways, as long as the purpose that the diaphragm can be fully unfolded before and after soaking can be achieved. As an example, the height of the infiltration chamber can be set to match the thickness of the membrane, so that the transparent panel can apply force to the membrane by its own weight to ensure that the membrane is in the unfolded state.
Further, in order to facilitate the injection of the infiltration chamber, an injection port 3 for injecting the impregnation liquid into the infiltration chamber may be formed in the seal assembly 2.
Further, in order to accelerate the infiltration speed of the diaphragm, the impregnation liquid can be drained. As an example, an air outlet 4 may be opened on the sealing component, and the air outlet 4 may be disposed at the opposite side of the liquid injection port 3 to facilitate the drainage of the immersion liquid.
Further, in order to accelerate the infiltration speed and ensure that the diaphragm is fully infiltrated, the pressure reducing device can be connected with the exhaust port 4.
As one example, the transparent panel is one or more of a glass panel, an acryl panel, a polypropylene reinforced plastic panel, preferably a glass panel.
As one example, the seal assembly may be an elastomeric rubber seal, an annular seal cover plate, or the like, preferably an elastomeric rubber seal.
Based on the device for testing the liquid injection wrinkling of the diaphragm, an evaluation method is further provided in the example, so that the device is used for evaluating the liquid injection wrinkling of the diaphragm.
The evaluation method for the diaphragm liquid injection wrinkling comprises the following steps:
s1, measuring the size of the diaphragm by adopting a size measuring assembly to obtain the size of the diaphragm before infiltration;
s2, placing the diaphragm in the infiltration cavity for infiltration treatment;
s3, measuring the size of the diaphragm in the infiltration state in the infiltration cavity by adopting a size measuring component to obtain the size of the infiltrated diaphragm;
s4 uses the dimensional changes of the diaphragm before and after wetting to evaluate the degree of wrinkling of the diaphragm.
In the present application, the dimension of the separator is the length of the separator in the Machine Direction (MD) and the Transverse Direction (TD), and in order to obtain an accurate separator dimension, a plurality of test points can be selected in the Machine Direction (MD) and the Transverse Direction (TD) of the separator for testing to accurately characterize the dimension of the separator.
In the present application, the dimensional change of the separator is characterized by the dimensional change amount calculated by equation (1):
wherein D' is the size of the membrane after soaking, and D is the size of the membrane before soaking.
As an example, referring to fig. 1 and 2, the evaluation method of the membrane injection wrinkling is as follows:
s1 spreading the diaphragm on the first transparent panel 5, brushing the diaphragm with a static electricity removing brush to make it fit to the first transparent panel 5, and then laminating the second transparent panel 6 so that the diaphragm is sandwiched between the first transparent panel 5 and the second transparent panel 6; measuring the length of the separator in the Machine Direction (MD) and Transverse Direction (TD), specifically, the length of 3 points measured in the MD (recorded MD1, MD2, MD3) and 2 points measured in the TD (recorded TD1, TD 2);
s2, injecting the impregnation liquid into the impregnation cavity through the liquid injection port 4 to fill the impregnation liquid into the impregnation cavity, and allowing the impregnation liquid to fully impregnate the diaphragm under a certain pressure (preferably under the action of gravity of the second transparent panel 6);
s3 again measures the length of 3 points in the MD direction (records MD1 ', MD2 ', MD3 ') and 2 points in the TD direction (records TD1 ', TD2 ') in S1;
s4 calculates the amount of dimensional change at 3 points in the MD direction and 2 points in the TD direction, and the greater the amount of dimensional change of the separator, the more pronounced its wrinkling in the battery.
In this application, fix the diaphragm through the mode of this application, can avoid the diaphragm to take place to curl during the measurement, guarantee that the diaphragm all is in the expansion state around soaking, further improved measuring accuracy.
Bubbles in the diaphragm can be removed before the size of the diaphragm after infiltration is measured, so that the measurement accuracy is improved. The manner of removing the bubbles within the septum may be varied so long as bubble removal is achieved. As an example, the second transparent panel may be scraped (i.e., the second transparent panel is scraped from the position of the liquid inlet 3 to the position of the gas outlet 4 to discharge the bubbles from the gas outlet 4), or the impregnation chamber may be depressurized while injecting the liquid to remove the gas in the membrane, thereby preventing the bubbles from being generated inside the membrane.
For the time of the infiltration treatment, the corresponding selection can be carried out according to the physical properties of the diaphragm, and for the diaphragm which is easy to swell, the time of the infiltration treatment can be relatively short; for a separator that does not swell easily, the treatment time can be prolonged accordingly. As an example, the time of the soaking treatment is 5-30min, preferably 10-15 min.
As for the selection of the impregnation liquid, the separator may be impregnated with an electrolyte, or a polar organic solvent that easily swells the separator may be selected. As an example, the impregnating solution can be one or a mixture of dimethyl carbonate, ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate, and the solvent has a high boiling point, excellent dissolving performance, low toxicity and environmental protection, and is very suitable for evaluating the liquid injection wrinkling performance of the diaphragm.
The features and properties of the present application are described in further detail below with reference to examples.
The operations and treatments referred to in this application are conventional in the art, unless otherwise indicated.
The apparatus used in this application is conventional in the art, unless otherwise specified.
Example 1
Firstly, cutting a diaphragm into test samples with the size of 150mm multiplied by 150 mm;
secondly, flatly paving a test sample on transparent glass, brushing a diaphragm by using an antistatic brush to enable the test sample to be flatly attached to the glass, then closing another layer of glass, measuring the length of the test sample in the longitudinal direction (MD) and the Transverse Direction (TD) by using a two-dimensional imager, measuring 3 points in the MD direction, recording MD1, MD2 and MD3, measuring 2 points in the TD direction, and recording TD1 and TD 2;
then, a rubber head dropper is used for sucking dimethyl carbonate (DMC) and injecting the dimethyl carbonate (DMC) into the infiltration cavity along the liquid injection port, so that the infiltration cavity is fully infiltrated with electrolyte, and the DMC is fully infiltrated into the test sample for 10-15 minutes only by the self weight of the upper glass without additional pressurization; after the soaking is completed, removing air bubbles in the test sample, measuring 3 points in the MD direction again, recording 2 points in the MD1 ', MD2 ', MD3 ' and TD direction, and recording TD1 ' and TD2 ';
finally, the dimensional change of the test specimens, as indicated by the degree of wrinkling before and after soaking in DMC, is shown in Table 1.
TABLE 1
| MD1 | MD2 | MD3 | TD1 | TD2 | |
| Before soaking (mm) | 149.6270 | 149.5790 | 149.5510 | 149.4949 | 149.4730 |
| After soaking (mm) | 150.3350 | 150.2870 | 150.2470 | 149.6410 | 149.6830 |
| Amount of change in size (%) | 0.47％ | 0.47％ | 0.47％ | 0.10％ | 0.14％ |
From the deformation amount data of the examples, it is understood that the larger the deformation amount of the separator after soaking in the electrolyte, the more serious the wrinkling thereof in the battery.
Comparative example 1
Firstly, cutting a diaphragm into test samples with the size of 150mm multiplied by 150 mm;
secondly, flatly paving a test sample on transparent glass, brushing a diaphragm by using a static removing brush to enable the diaphragm to be flatly attached to the glass, then closing another layer of glass, measuring the length of the diaphragm in the longitudinal direction (MD) and the Transverse Direction (TD) by using a quadratic element imager, measuring 3 points in the MD direction, recording MD1, MD2 and MD3, measuring 2 points in the TD direction, and recording TD1 and TD 2;
then, completely soaking the test sample in a container filled with DMC, sealing for 10-15 minutes, then taking the test sample out of the container and sucking the DMC on the surface of the diaphragm to be dry; spreading the soaked test sample on a test platform, and brushing a diaphragm by using an antistatic brush to enable the diaphragm to be smoothly attached to glass; measuring the length of the separator in the longitudinal (MD) direction and the Transverse (TD) direction by using a two-dimensional imager, measuring 3 points in the MD direction, recording 2 points in the MD1 ', MD2 ' and MD3 ' and in the TD direction, and recording TD1 ' and TD2 ';
finally, the degree of wrinkling was indicated by the change in dimension of the membrane before and after soaking the membrane in DMC and the change in dimension of the membrane is shown in table 2.
| MD1 | MD2 | MD3 | TD1 | TD2 | |
| Before soaking (mm) | 149.4800 | 149.4620 | 149.3470 | 149.4830 | 149.4603 |
| After soaking (mm) | 149.1500 | 149.1050 | 149.0160 | 149.3810 | 149.3720 |
| Amount of change in size (%) | －0.22％ | －0.24％ | －0.22％ | －0.07％ | －0.06％ |
It can be seen from the data of the comparative example and the example that the separator substantially swells after being soaked in the electrolyte, so that the size of the separator becomes large, and wrinkles are easily generated during use, but the comparative example measures the data after drying the separator, and the data result obtained by measuring the data is that the separator shrinks, which obviously does not truly reflect the reality of the separator when being soaked in the electrolyte in the battery.
The above description is only a few examples of the present application and is not intended to limit the present application, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (15)
1. A test device for membrane injection wrinkling, comprising:
the size measuring component is used for measuring the sizes of the front diaphragm and the rear diaphragm after infiltration;
the membrane infiltration assembly is used for carrying out infiltration treatment on the membrane;
the diaphragm infiltration assembly comprises a first transparent panel, a second transparent panel and a sealing assembly, the first transparent panel and the second transparent panel are overlapped and arranged, the sealing assembly is detachably arranged along the periphery of the first transparent panel and the periphery of the second transparent panel, an infiltration cavity for infiltrating the diaphragm is formed among the first transparent panel, the second transparent panel and the sealing assembly, and a liquid injection port for injecting impregnation liquid into the infiltration cavity is formed in the sealing assembly.
2. The testing device of claim 1, wherein the sealing assembly further comprises an air vent.
3. The test device of claim 2, wherein the vent is coupled to a pressure relief device to increase the venting speed of the diaphragm.
4. A test device as claimed in any one of claims 1 to 3, wherein the dimensional measurement component comprises one of a two-dimensional imager, a grating rangefinder or an infrared rangefinder; and/or the transparent panel is one or more of a glass panel, an acrylic panel and a polypropylene reinforced plastic plate; and/or the sealing component is one of an elastic rubber sealing ring or an annular sealing cover plate.
5. The method for evaluating the liquid injection wrinkling of the diaphragm by using the testing device for the liquid injection wrinkling of the diaphragm according to claim 1 comprises the following steps:
s1, measuring the size of the diaphragm in the infiltration cavity by using the size measuring component to obtain the size of the diaphragm before infiltration;
s2 infiltrating the diaphragm in the infiltration chamber;
s3, measuring the size of the diaphragm in the infiltration state in the infiltration cavity by using the size measuring component to obtain the size of the infiltrated diaphragm;
s4 uses the dimensional changes of the diaphragm before and after wetting to evaluate the degree of wrinkling of the diaphragm.
6. The evaluation method according to claim 5, wherein step S1 includes:
s11, flatly laying the diaphragm on the first transparent panel, flatly laying the second transparent panel on the diaphragm, and installing a sealing assembly, so that the diaphragm is arranged in the infiltration cavity;
and S12, measuring the size of the diaphragm in the infiltration cavity to obtain the size of the diaphragm before infiltration.
7. The method of claim 6, wherein step S11, after the step of laying the membrane on the first transparent panel and before the step of laminating the second transparent panel on the membrane, further comprises a step of removing static electricity from the membrane.
8. The evaluation method according to claim 6, wherein step S2 includes:
s21, injecting impregnating solution into the infiltration cavity from the solution injection port;
s22 the diaphragm placed in the infiltration chamber is subjected to infiltration treatment.
9. The evaluation method according to claim 8, wherein when the immersion liquid is injected into the infiltration chamber from the liquid injection port, the immersion liquid is injected into the infiltration chamber until the infiltration chamber is filled with the immersion liquid.
10. The evaluation method according to claim 8, wherein an exhaust treatment is performed simultaneously with the injection of the impregnation fluid from the fluid injection port into the impregnation chamber.
11. The evaluation method according to claim 10, wherein the degassing treatment includes degassing the diaphragm by a scraping treatment and/or a pressure-reducing treatment.
12. The method of any one of claims 5-11, wherein a vent is provided in the seal assembly and the infiltration chamber is evacuated and depressurized with a pressure reduction device.
13. The evaluation method according to claim 8, wherein the infiltration treatment is performed under pressure; and/or the time of the infiltration treatment is 5-30 min.
14. The evaluation method according to claim 13, wherein the time for the infiltration treatment is 10 to 15 min.
15. The evaluation method according to claim 5, wherein the impregnation liquid is one or a mixture of dimethyl carbonate, ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate.
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