WO2021223115A1

WO2021223115A1 - Electrolyte resistance testing method for adhesive tape

Info

Publication number: WO2021223115A1
Application number: PCT/CN2020/088817
Authority: WO
Inventors: 吴伟卿
Original assignee: 河源新之源粘贴技术有限公司
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2021-11-11

Abstract

The present invention relates to an electrolyte resistance testing method for adhesive tape. The method comprises the following steps: respectively adhering adhesive tape to be tested to standard test boards to obtain a control piece and a test piece; immersing the test piece in an electrolyte, leaving same to stand at 45-95°C for 4-24 h, then taking out the test piece, completely soaking up the electrolyte, and then standing for 10-30 min; measuring the peel strength between said adhesive tape and the standard test board of the test piece from which the electrolyte has been completely soaked up, so as to obtain peel strength I; measuring the peel strength between said adhesive tape and the standard test board of the control piece, so as to obtain peel strength II; and taking changes in peel strength I and peel strength II as a determination basis, and contrasting same with a standard or requirement of the adhesive tape to determine whether an electrolyte resistance test for said adhesive tape is up to standard. In the method, a quantization means is implemented in conjunction with the standard or requirement for the adhesive tape, thereby facilitating the accurate determination of whether an adhesive tape product is up to standard. The method has a good reproducibility, and is intuitive.

Description

Test method of adhesive tape resistance to electrolyte

Technical field

The invention relates to the field of quality inspection standards, in particular to a method for testing the resistance of an adhesive tape to electrolyte.

Background technique

With the development of society, rechargeable secondary lithium-ion batteries have many advantages such as high energy density, high working voltage, long cycle life, no memory effect, green environmental protection, and flexible design according to actual needs. More and more electrical equipment are selected as power sources, especially mobile electrical equipment, energy storage stations and new energy vehicles. The wide range of applications has been driving the rapid development of lithium-ion batteries.

Lithium batteries include a positive electrode, a negative electrode, and an electrolyte. Among them, the electrolyte is one of the core components of lithium-ion batteries, and its main components include lithium hexafluorophosphate, ethylene carbonate, diethyl carbonate, dimethyl carbonate and ethyl methyl carbonate, etc., which have corrosive properties. Therefore, the working environment is electrolyte, and the adhesive tape used for fixing and insulating the positive and negative materials in the battery needs to have the performance of resistance to the electrolyte of the lithium ion battery, and the electrolyte resistance test is also a necessary basic test item.

However, the current testing method of adhesive tape resistance to electrolyte is to directly paste the adhesive tape on a thin aluminum foil and put it in the electrolyte. After a period of time, observe whether the adhesive tape is arched, shifted, or penetrated. , Whether the electrolyte has faded, and whether the adhesive remains after tearing off the tape, etc., to determine the impact of the electrolyte on the adhesive tape, and further determine whether the adhesive tape is qualified. This method is simple and direct. However, the above method is greatly affected by subjective factors, and the test method is not standardized. At the same time, the test method lacks quantitative indicators, which is not conducive to accurately judging whether the adhesive tape product is qualified or not, and the experimental results are difficult to reproduce.

Summary of the invention

In view of the technical problems existing in the above-mentioned industries, the present invention provides a test method for the resistance of the adhesive tape to electrolyte. The tools and materials used in the electrolyte resistance test process are standardized and standardized. The peel strength change of the test board is used as the evaluation standard, and a quantitative method is implemented to accurately determine whether the adhesive tape product is qualified or not. The above-mentioned test method is reproducible, intuitive, and convenient for discrimination.

The specific technical solutions are:

A testing method for the resistance of an adhesive tape to electrolyte includes the following steps:

Attach the adhesive tape to be tested to the standard test board to obtain the control part and the test part;

Immerse the test piece in the electrolyte, place it at 45°C-95°C for 4h-24h, take it out, absorb the electrolyte and leave it for 10min-30min;

Measure the peel strength between the adhesive tape to be tested and the standard test plate of the test piece after the electrolyte is dried, and obtain the peel strength I;

Measure the peel strength between the adhesive tape to be tested and the standard test board of the reference part, and obtain the peel strength II;

Taking the change of the peeling strength I and the peeling strength II as the judgment basis, and comparing the adhesive tape standards or requirements, it is judged whether the electrolyte resistance test of the adhesive tape to be tested is qualified.

In some preferred embodiments, the change rate of the electrolyte of the adhesive tape is used as the judgment basis, and the standards or requirements of the adhesive tape are compared to determine whether the electrolyte resistance test of the adhesive tape to be tested is qualified;

The calculation method of the change rate of the electrolyte of the adhesive tape is: peel strength I/peel strength II×100%.

In some preferred embodiments, the attenuation rate of the electrolyte of the adhesive tape is used as the judgment basis, and the standards or requirements of the adhesive tape are compared to determine whether the electrolyte resistance test of the adhesive tape to be tested is qualified;

The calculation method of the attenuation rate is: (peel strength II-peel strength I)/peel strength II×100%.

In some preferred embodiments, the standard test plate is selected from stainless steel plate, glass plate, aluminum-plastic plate, aluminum plate, aluminum foil, copper foil, copper-plastic plate or copper plate.

In some preferred embodiments, the thickness of the standard test board is 5 μm-400 μm.

In some preferred embodiments, the method of immersing the test piece in the electrolyte is: placing the test piece in a container, and adding the electrolyte into the container.

In some preferred embodiments, the container is a straight wide-mouth bottle with a communicating spacer layer inside.

In some preferred embodiments, the material of the container is selected from polytetrafluoroethylene, polyethylene, polypropylene, polystyrene, polyphenylene ether, polyphenylene sulfide, polyamide or glass.

In some preferred embodiments, after the bonding, the test piece is placed for at least 10 minutes and then immersed in the standard electrolyte.

In some preferred embodiments, when measuring the peel strength between the adhesive tape to be tested and the standard test plate of the test piece after the electrolyte is dried, the peeling angle is 180 degrees.

In some preferred embodiments, when the peel strength between the adhesive tape to be tested and the standard test plate of the control part is measured, the peel angle is 180 degrees.

Compared with the existing solutions, the present invention has the following beneficial effects:

Based on his long-term experience in the field and a large number of creative experiments, the inventor of the present application has researched and obtained a test method for the resistance of the adhesive tape to electrolyte, also known as the "Wu's method", which passes the test of the adhesive tape Stick it on a standard test board, then immerse it in the electrolyte, place it at 45°C-95°C for 4h-24h, take it out, and blot the electrolyte. After blotting the electrolyte, the adhesive tape and the adhesive tape of the test piece to be tested The peel strength between the standard test plates is measured to obtain the peel strength I, and the peel strength between the adhesive tape to be tested and the standard test plate of the control part is measured to obtain the peel strength II. The change in the peel strength of the adhesive tape and the test board before and after immersion in the electrolyte is used as the evaluation standard, and the adhesive tape standards or requirements are compared with the implementation of quantitative means to accurately determine whether the adhesive tape product is qualified or not. The above-mentioned Wu's method is used to test the adhesive tape's resistance to electrolyte, which has good reproducibility, intuitiveness, and facilitates discrimination.

Further, the present invention also provides for the standard test board (named "Wu's plate"), a container for containing the electrolytic solution (named "Wu's bottle"), and tools, materials, test procedures, and test procedures during the electrolyte resistance test. The evaluation method is standardized and standardized, with standardized test procedures, standardized test methods, standardized data processing, and standardized evaluation standards, which minimize the influence of subjective factors during the adhesive tape testing process and facilitate promotion in the industry.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

The existing testing methods for the resistance of adhesive tapes to electrolyte are largely affected by subjective factors and are not standardized. At the same time, the testing methods do not use quantitative means, the experimental results are difficult to reproduce, and it is not conducive to accurately judging whether the adhesive tape products are qualified or not. The invention provides a test method for the resistance of an adhesive tape to electrolyte, which is also called "Wu's method".

The specific technical solutions are:

Specifically, the method of attaching the adhesive tape to be tested to the standard test board can be as follows:

Tear off three to four turns of the adhesive tape to be tested, and cut six adhesive tapes with a width of 25 mm and a length of 300 mm. Select one of the cut adhesive tapes and paste one end of the adhesive tape on one end of the standard test board , Place the adhesive tape on the standard test board naturally, and then use a 2KG roller machine to roll back and forth three times at a speed of 300mm/min, so that the adhesive tape to be tested is attached to the standard test board to obtain a test piece. Repeat the above steps to obtain the remaining five test pieces. Randomly and averagely divide the test pieces into two groups with three pieces in each group. One group is subjected to the electrolyte resistance test, which is called the test group, the test piece is called the test piece, and the other group is placed in a constant temperature and humidity test environment. For the control group, correspondingly, the test piece is called the control piece.

Understandably, before lamination, the adhesive tape to be tested and the standard test board can be placed in a standard environment of constant temperature and humidity for no less than 30 minutes to adjust the state. The standard environment of constant temperature and humidity may be an environment of 23±1° C. and 50±5% RH (relative humidity).

In addition, it is understandable that the standard test board can also be cleaned before bonding.

In some preferred embodiments, the standard test plate is selected from stainless steel plate, glass plate, aluminum-plastic plate, aluminum plate, aluminum foil, copper foil, copper-plastic plate or copper plate, and the standard test plate is named "Wu's plate" .

Preferably, the thickness of the standard test board is 5 μm-400 μm.

When the standard test plate is a stainless steel plate, a glass plate, an aluminum-plastic plate, an aluminum plate, a copper-plastic plate or a copper plate, the thickness of the standard test plate is preferably 100 μm-400 μm.

When the standard test board is aluminum foil or copper foil, the thickness of the standard test board is preferably 5 μm-20 μm.

In some preferred embodiments, after bonding, the test piece is placed for at least 10 minutes, and then immersed in the electrolyte.

Understandably, after bonding, the test piece is placed in a standard environment of constant temperature and humidity for at least 10 minutes, and then immersed in the electrolyte. The standard environment of constant temperature and humidity may be an environment of 23±1° C. and 50±5% RH (relative humidity).

In some preferred embodiments, the test piece is placed in a container, the electrolyte is added to the container, and the container containing the discharge solution is named "Wu's bottle".

Understandably, the container may be a straight wide-mouth bottle.

It should be understood that the interior of the straight wide-mouth bottle may be designed with a communicating spacer layer, or without a spacer layer.

In some preferred embodiments, the container is a straight wide-mouth bottle with a communicating spacer layer inside. The design of the spacer layer can perform electrolyte resistance tests on multiple adhesive tapes to be tested at the same time, which is convenient for multiple tests. The parts are separated to prevent the test parts from overlapping, which will affect the full immersion of the electrolyte.

In some preferred embodiments, the electrolyte is a ternary lithium electrolyte, and a ternary lithium electrolyte commonly used in the field of lithium batteries can be used, and the present invention is not limited herein.

In some preferred embodiments, the electrolyte is lithium iron phosphate electrolyte, and lithium iron phosphate electrolyte commonly used in the field of lithium batteries can be used, and the present invention is not limited herein.

The test piece is immersed in the electrolyte, placed at 45°C-95°C for 4h-24h, taken out and sucked up the electrolyte.

Understandably, after taking it out, dry the remaining electrolyte on the surface of the test piece with dust-free paper, and then place it in the test environment for 10-30 minutes.

It should be understood that the peel strength measurement needs to be completed within 30 minutes after the electrolyte is drained.

The test environment is a standard environment of constant temperature and humidity, and the standard environment of constant temperature and humidity may be an environment of 23±1° C. and 50±5% RH (relative humidity).

Test the peel strength of the test piece and the control piece that have absorbed the electrolyte. The test method of the peel strength can refer to the national standard GB/T2792-2014 "Test Method for the Peel Strength of Adhesive Tapes".

In some preferred embodiments, when measuring the peel strength between the adhesive tape to be tested and the standard test plate of the test piece after the electrolyte is dried, the peel angle is 180 degrees.

It should be understood that during the entire test process, the test piece is immersed in the electrolyte environment, and the control piece is placed in the constant temperature and humidity test environment. Except for this, the other operations should both be under the same conditions.

The peel strength between the adhesive tape to be tested and the standard test board of the test piece after the electrolyte is absorbed is measured to obtain the peel strength I; the adhesive tape to be tested and the standard test board of the control piece The peel strength between the two was measured, and the peel strength II was obtained.

In some preferred embodiments, the ratio of peel strength II to peel strength I can be used as the basis for judgment (peel strength II/peel strength I×100%), and the adhesive tape standards or requirements can be compared to determine the adhesive tape’s performance Whether the electrolyte resistance test is qualified. That is, the electrolyte change rate of the adhesive tape is used to determine whether the test of the electrolyte resistance of the adhesive tape to be tested is qualified. The specific ratio of judgment can be formulated according to the different performance requirements of the product.

In some preferred embodiments, the attenuation rate of the electrolyte of the adhesive tape can be used as the basis for judgment, and the standard or requirements of the adhesive tape can be compared to determine whether the electrolyte resistance test of the adhesive tape to be tested is qualified; the adhesive tape electrolysis The calculation method of the liquid attenuation rate is: (Peel Strength II-Peel Strength I)/Peel Strength II×100%. That is, the electrolyte decay rate method of the adhesive tape is used to determine whether the test of resistance to electrolyte of the adhesive tape to be tested is qualified. Similarly, the specific attenuation rate of the electrolyte of the adhesive tape can be determined according to the different performance requirements of the product.

Taking the high-viscosity termination adhesive tape used in lithium-ion batteries as an example, according to the customer's performance requirements for the product, it is stipulated that the method of the present invention is used to judge whether it is qualified or not. The percentage method (peel strength II/peel strength The measured value of I) is greater than 20%, or the attenuation rate in the attenuation method is less than 80%.

The above-mentioned test method for the resistance of the adhesive tape to electrolyte, also called "Wu's method", has a standardized test procedure, a standardized test method, a standardized data processing, and a standardized evaluation standard. Through the standardization and standardization of the electrolyte resistance test board, the electrolyte resistance test container, other tools, materials and the environment for the electrolyte resistance test used in the test process, the adhesive tape and the test board before and after immersion in the electrolyte are standardized and standardized. The peel strength change is used as the evaluation standard. Compared with the standard or requirements of the adhesive tape, the quantitative method is implemented to accurately judge whether the adhesive tape product is qualified or not. The Wu's method is used to test the electrolyte resistance of the adhesive tape. The reproducibility is good, intuitive, and beneficial. Discriminate.

The following description will be given in conjunction with specific embodiments, where the raw materials and instruments involved in the specific embodiments, unless otherwise specified, can all be commercially available.

Example 1

This embodiment provides a method for testing the resistance of an adhesive tape to electrolyte, which includes the following steps:

(1) Take the adhesive tape to be tested and place it in an environment of 23±1°C and 50±5% RH (relative humidity) for 24 hours to adjust the state.

(2) Take 6 identical SUS316 standard test steel plates, wipe their surfaces 4 times with acetone, and leave them in the air for 30 minutes. The thickness of the SUS316 standard test steel plates is 200 μm, and the surface roughness Ra is 40 nm.

(3) Pull off three to four turns of the adhesive tape to be tested, and cut six adhesive tapes with a width of 25mm and a length of 300mm. Select one of the cut adhesive tapes and paste one end of the adhesive tape on the standard test board. Place the adhesive tape on the standard test board naturally, and then use a 2KG roller machine to roll back and forth three times at a speed of 300mm/min, so that the adhesive tape to be tested is attached to the standard test board to obtain a test piece . Repeat the above steps to obtain the remaining five test pieces. Randomly and averagely divide the test pieces into two groups with three pieces in each group. One group is subjected to the electrolyte resistance test, which is called the test group, the test pieces are called test pieces D, E, F, and the other group is placed at constant temperature and humidity. In the test environment, it is called the control group. Correspondingly, the test pieces are called control pieces A, B, and C.

(4) After bonding, leave it for 15 minutes, put the 3 test pieces of the test group in 3 different compartments of the straight wide-mouth bottle, and then fill the straight wide-mouth bottle with electrolyte, and keep it at 65℃. Leave it for 6 hours, take out the 3 test pieces, dry the electrolyte with dust-free paper, and then leave it for 10 minutes.

(5) Carry out the peel strength test on the 3 control parts and the 3 test parts after blotting the electrolyte, the method is as follows:

Peel off a little 25mm adhesive tape from one end of the stainless steel plate, clamp one end of the steel plate in the clamp of the tensile testing machine, and clamp the free end of the adhesive tape to another clamp to make the free end adhesive tape and the stainless steel plate appear 180 Spend. Continuous peeling at 180° at a rate of 5±0.2mm/s. After the load clamp is running, the value obtained when the first 25mm adhesive tape is mechanically peeled off is ignored. The average force value obtained by the next 50mm adhesive tape is used as the peeling force. Converted to peel strength.

The peel strengths of 3 control pieces and 3 test pieces are shown in Table 1.

Table 1

At different times, different testers repeated the above experiment, and the results obtained are shown in Table 2.

Table 2

It can be seen from Table 1 and Table 2 that the reproducibility of this implementation method is good.

Example 2

This embodiment provides a test method for the resistance of the adhesive tape to electrolyte. The difference from Embodiment 1 is that the standard test board and its thickness and surface roughness are different from those in Embodiment 1, and specifically include the following steps:

(1) Take the same adhesive tape to be tested as in Example 1, and place it in an environment of 23±1° C. and 50±5% RH (relative humidity) for 24 hours to adjust the state.

(2) Take 6 identical aluminum-plastic panels, wipe their surfaces 4 times with acetone, and leave them in the air for 30 minutes. The thickness of the aluminum-plastic panels is 110 μm, and the surface roughness Ra is 75 nm.

(3) Pull off three to four turns of the adhesive tape to be tested, and cut six adhesive tapes with a width of 25mm and a length of 300mm. Select one of the cut adhesive tapes and paste one end of the adhesive tape on the standard test board. Place the adhesive tape on the standard test board naturally, and then use a 2KG roller machine to roll back and forth three times at a speed of 300mm/min, so that the adhesive tape to be tested is attached to the standard test board to obtain a test piece . Repeat the above steps to obtain the remaining five test pieces. Randomly and averagely divide the test pieces into two groups, each group has three pieces, one group is subjected to the electrolyte resistance test, which is called the test group, the test pieces are called test pieces d, e, f, and the other group is placed at constant temperature and humidity In the test environment, it is called the control group. Correspondingly, the test pieces are called control pieces a, b, and c.

(4) After bonding, leave it for 15 minutes, put the 3 test pieces of the test group in the three different compartments of the straight wide-mouth bottle, and then fill the straight wide-mouth bottle with electrolyte, and keep it at 65℃. Leave it for 6 hours, take out the 3 test pieces, dry the electrolyte with dust-free paper, and then leave it for 10 minutes.

Peel off a little 25mm adhesive tape from one end of the aluminum composite panel, clamp one end of the aluminum composite panel in the fixture of the tensile testing machine, and clamp the free end of the adhesive tape to the other fixture to make the free end adhesive tape and aluminum The plastic board presents 180 degrees. Continuous peeling at 180° at a rate of 5±0.2mm/s. After the load clamp is running, the value obtained when the first 25mm adhesive tape is mechanically peeled off is ignored. The average force value obtained by the next 50mm adhesive tape is used as the peeling force. Converted to peel strength.

The peel strengths of 3 control pieces and 3 test pieces are shown in Table 3.

table 3

At different times, different testers repeated the above experiment, and the results obtained are shown in Table 4.

Table 4

It can be seen from Table 3 and Table 4 that the test method in this implementation has good reproducibility.

Example 3

In this embodiment, a high-viscosity termination adhesive tape for lithium-ion batteries that was identified by the customer as unqualified during the production process is used as the adhesive tape to be tested, and the method of the present invention and the background art mentioned in the background technology are used respectively. The current method for testing the resistance of adhesive tapes to electrolyte is carried out, and the specific steps are as follows:

method 1

(1) Take the adhesive tape and place it in an environment of 23±1°C and 50±5% RH (relative humidity) for 24 hours to adjust the state.

(2) Take 6 pieces of the same aluminum foil, wipe their surfaces 4 times with acetone, and leave them in the air for 30 minutes. The thickness of the aluminum foil is 11 μm.

(3) Pull off three to four turns of the adhesive tape to be tested, and cut six adhesive tapes with a width of 25mm and a length of 300mm. Select one of the cut adhesive tapes and paste one end of the adhesive tape on one end of the aluminum foil , The adhesive tape is naturally placed on the aluminum foil, and then rolled back and forth three times at a speed of 300mm/min with a 2KG roller press, so that the adhesive tape to be tested is bonded to the aluminum foil to obtain a test piece. Repeat the above steps to obtain the remaining five test pieces. Randomly and averagely divide the test pieces into two groups, each group has three pieces, one group is subjected to the electrolyte resistance test, which is called the test group, the test pieces are called test pieces IV, V, VI, and the other group is placed at constant temperature and humidity. In the test environment, it is called the control group, and correspondingly, the test pieces are called control pieces I, II, and III.

(4) After bonding, place it for 15 minutes, place the 3 test pieces in the three communicating layers of the straight wide-mouth bottle, and then fill the straight wide-mouth bottle with electrolyte, and place it at 85°C for 12 hours. Take out the 3 test pieces, dry the electrolyte with dust-free paper, and then leave them for 10 minutes.

Stick the test piece on the stainless steel test board with strong double-sided adhesive tape, peel off a little 25mm adhesive tape from one end of the aluminum foil, and clamp the aluminum foil and one end of the steel plate in the fixture of the tensile testing machine, the free end of the adhesive tape Clamp it into another fixture to make the free end adhesive tape and the aluminum foil appear 180 degrees. Continuous peeling at 180° at a rate of 5±0.2mm/s. After the load clamp is running, the value obtained when the first 25mm adhesive tape is mechanically peeled off is ignored. The average force value obtained by the next 50mm adhesive tape is used as the peeling force. Converted to peel strength.

The peel strengths of 3 control pieces and 3 test pieces are shown in Table 5.

table 5

According to the judgment standard of high-viscosity terminated adhesive tape, the change rate of the electrolyte of the adhesive tape is not less than 20% or the attenuation rate of the electrolyte of the adhesive tape is not higher than 80%, and the product is judged to be qualified, and the test results of the above-mentioned adhesive tape Among them, the adhesive tape electrolyte change rate was 3.05%, and the adhesive tape electrolyte attenuation rate was 96.95%. According to the judgment standard, the high-viscosity terminated adhesive tape product was a substandard product.

Method 2 (the current method introduced in the background art)

(1) Take the same adhesive tape and place it in an environment of 23±1°C and 50±5% RH (relative humidity) for 24 hours to adjust the state.

(2) Cut the adhesive tape to obtain 1 sample.

(3) Paste the adhesive tape sample with a width of 25mm on the aluminum foil (thickness of 11μm), roll it back and forth with a 2KG pressure roller, cut into three pieces of 20mm length, immerse them in the electrolyte, and place them at 85℃ for 12h, and observe Whether the adhesive tape is arched, displaced, penetrated, whether the electrolyte has faded, and whether the adhesive remains after the tape is torn off. The test results are shown in Table 6.

Table 6

To	起拱Arching	移位Shift	穿透penetrate	脱色Bleaching	掉胶Glue drop
试验件Test piece	否no	否no	否no	否no	否no

It can be seen from the test results in Table 6 that the adhesive tape should be qualified according to the current adhesive tape testing method and judgment standard. It can be seen that the test results of the current adhesive tape test method have certain drawbacks. The result of the test method of the present invention is more accurate.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and their description is relatively specific and detailed, but they should not be understood as a limitation on the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A method for testing the resistance of an adhesive tape to electrolyte, which is characterized in that it comprises the following steps:

Attach the adhesive tape to be tested to the standard test board to obtain the control part and the test part;

Immerse the test piece in the electrolyte, place it at 45°C-95°C for 4h-24h, take it out, absorb the electrolyte and leave it for 10min-30min;

Measure the peel strength between the adhesive tape to be tested and the standard test plate of the test piece after the electrolyte is dried, and obtain the peel strength I;

Measure the peel strength between the adhesive tape to be tested and the standard test board of the reference part, and obtain the peel strength II;

Taking the change of the peeling strength I and the peeling strength II as the judgment basis, and comparing the adhesive tape standards or requirements, it is judged whether the electrolyte resistance test of the adhesive tape to be tested is qualified.
The test method for the resistance of the adhesive tape to electrolyte according to claim 1, wherein the change rate of the electrolyte of the adhesive tape is used as a judgment basis, and the standard or requirement of the adhesive tape is compared to determine the resistance of the adhesive tape to be tested. Whether the liquid test is qualified;

The calculation method of the change rate of the electrolyte of the adhesive tape is: peel strength I/peel strength II×100%.
The method for testing the resistance of the adhesive tape to electrolyte according to claim 1, wherein the attenuation rate of the electrolyte of the adhesive tape is used as a judgment basis, and the standards or requirements of the adhesive tape are compared to determine the resistance of the adhesive tape to be tested. Whether the liquid test is qualified;

The calculation method of the attenuation rate of the electrolyte of the adhesive tape is: (peel strength II-peel strength I)/peel strength II×100%.
The method for testing the adhesive tape resistance to electrolyte according to claim 1, wherein the standard test board is selected from the group consisting of stainless steel plate, glass plate, aluminum-plastic plate, aluminum plate, aluminum foil, copper foil, copper-plastic plate or copper plate .
The method for testing the resistance of the adhesive tape to electrolyte according to claim 4, wherein the thickness of the standard test board is 5 μm-400 μm.
The method for testing the adhesive tape resistance to electrolyte according to any one of claims 1-5, wherein the method of immersing the test piece in the electrolyte is: placing the test piece in a container , Add the electrolyte to the container.
The method for testing the resistance of the adhesive tape to electrolyte according to claim 6, wherein the container is a straight wide-mouth bottle with a communicating spacer layer inside.
The method for testing the resistance of the adhesive tape to electrolyte according to claim 6, wherein the material of the container is selected from polytetrafluoroethylene, polyethylene, polypropylene, polystyrene, polyphenylene ether, polyphenylene sulfide Ether, polyamide or glass.
The method for testing the resistance of the adhesive tape to electrolyte according to any one of claims 1 to 5, characterized in that, after the bonding, the test piece is placed for at least 10 minutes, and then immersed in the electrolyte.
The method for testing the adhesive tape's resistance to electrolyte according to any one of claims 1-5, wherein the gap between the adhesive tape to be tested and the standard test board of the test piece after the electrolyte is absorbed When the peel strength is measured, the peel angle is 180 degrees;

When measuring the peel strength between the adhesive tape to be tested and the standard test plate of the control piece, the peeling angle is 180 degrees.