CN111812470B - Method for testing continuous voltage resistance of film - Google Patents
Method for testing continuous voltage resistance of film Download PDFInfo
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- CN111812470B CN111812470B CN202010707447.8A CN202010707447A CN111812470B CN 111812470 B CN111812470 B CN 111812470B CN 202010707447 A CN202010707447 A CN 202010707447A CN 111812470 B CN111812470 B CN 111812470B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
Abstract
The invention discloses a method for testing continuous voltage resistance of a film, which comprises the following steps: (1) placing the film to be tested on a winding and unwinding device to be unwound; (2) the pressure range provided by the booster pump is set to be 0-5 MPa through a central control system; (3) the heating rod is set to work or not work through a central control system; (4) setting the intermittent advancing speed, the boosting rate, the upper limit and/or the lower limit of breakdown current of the coiling and uncoiling device through a central control system; (5) starting a test circuit switch, boosting a program and starting a test; (6) when the voltage-resistant tester is automatically powered off and the bee rings, ending the test and recording the display voltage of the area at the moment; (7) and continuously testing different areas of the film to be tested through the winding and unwinding device to obtain the breakdown voltage data of the film. By adopting the method, the pressure-resistant condition of the diaphragm in the battery can be better simulated, the battery manufacture is pre-judged, the raw material waste in the production process of the battery core is reduced, and the yield is improved.
Description
Technical Field
The invention relates to the field of thin film test equipment, in particular to a test method for continuous voltage resistance of a thin film.
Background
With the popularization of electric automobiles, the market of power batteries is gradually expanded, and higher requirements are put forward on the electrical performance and the safety performance of lithium ion batteries. The diaphragm is one of the key materials of the lithium battery, and plays an important role in the electrical performance and the safety performance of the lithium battery.
Generally, in the production and manufacturing process of a lithium battery, a battery manufacturer can load certain voltages on the positive electrode and the negative electrode of the battery to test the short-circuit rate of the lithium battery after assembling the positive electrode, the negative electrode and a diaphragm material of the battery; in the test, if the withstand voltage value of the diaphragm is too small, the diaphragm is easy to break down, and the lithium battery is short-circuited and scrapped; thereby causing waste of raw materials and an increase in cost. Therefore, it is necessary to develop a device for testing the withstand voltage of a lithium battery separator, so as to predict the problems of the yield of the battery and the waste of raw materials.
Because the size distribution of the pores of the diaphragm is not uniform, and the film surface and the thickness are not uniform, the diaphragm has the weak point of being easy to be punctured. At present, the membrane breakdown voltage test method is generally a test of a fixed area or a movable conducting rod. For example, CN 207366690U discloses a method for testing breakdown voltage in a single-point fixed area, which can accurately test the value of the breakdown voltage of a diaphragm in a certain area, but most of the positions cannot be tested, so that the weak point of the breakdown voltage on the diaphragm is easily ignored, sampling has a large randomness, and the test range is limited; and the parallelism of the electrode plate is poor, so that the joint degree of the film to be tested and the electrode plate is not high, and the measured data is not necessarily the lowest pressure resistance value in the diaphragm, so that the test result has larger error. CN208818795U discloses a method for testing breakdown voltage of an isolation film, in which a conductive rod is used as an electrode to perform breakdown voltage testing, although continuous testing is possible, the problems of jitter and parallelism exist during the movement of the conductive rod, the pressure and temperature between two electrodes are also not controllable, and the testing stability is poor. Moreover, the soft package lithium ion battery can pass through the process of hot-cold pressing when assembling at present, and the diaphragm inside the winding core has certain tension, and under the conditions of the pressure and the temperature, the voltage resistance characteristic of the diaphragm can be changed to a certain extent.
Disclosure of Invention
In view of this, the invention is expected to provide a breakdown voltage testing method capable of continuously testing the pressure and the pressure of the isolation film under the condition of being heated, so as to better simulate the pressure and the pressure resistant condition of the isolation film in the battery, pre-judge the battery manufacture, reduce the raw material waste in the production process of the battery core and improve the yield.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a test method of continuous voltage resistance of a film, which comprises a voltage resistance tester, a booster pump, an upper polar plate, a lower polar plate, an upper flexible conductive film layer, a lower flexible conductive film layer, a heating rod, a coiling and uncoiling device and a central control system; the method comprises the following steps:
(1) placing the film to be tested on a winding and unwinding device to be unwound;
(2) the pressure range provided by the booster pump is set to be 0-5 MPa through a central control system;
(3) the heating rod is set to work or not work through a central control system;
(4) setting the intermittent advancing speed, the boosting rate, the upper limit and/or the lower limit of breakdown current of the coiling and uncoiling device through a central control system;
(5) starting a test circuit switch, boosting a program and starting a test;
(6) when the voltage-resistant tester is automatically powered off and the bee rings, ending the test and recording the display voltage of the area at the moment;
(7) and continuously testing different areas of the film to be tested through the winding and unwinding device to obtain the breakdown voltage data of the film.
Furthermore, the booster pump is connected with the upper polar plate through a connecting shaft; the heating rod is arranged in the hole structures of the upper polar plate and the lower polar plate; the sides of the corresponding surfaces of the upper polar plate and the lower polar plate are respectively covered with an upper flexible conductive thin film layer and a lower flexible conductive thin film layer and are connected with a voltage-resistant tester through a lead; the voltage-resistant tester is connected with the central control system through the converter; the central control system controls the coiling and uncoiling device.
Further, during testing, the film to be tested is positioned between the upper flexible conductive film layer and the lower flexible conductive film layer and is in close contact with the upper flexible conductive film layer and the lower flexible conductive film layer.
Furthermore, elastic media are filled in the upper flexible conductive thin film layer and the lower flexible conductive thin film layer.
Specifically, the elastic medium is a conductive silica gel pad or conductive graphite.
Furthermore, the upper and lower polar plates are made of metal materials.
Furthermore, the metal material is stainless steel or red copper.
Furthermore, the surfaces of the upper and lower polar plates are smooth and flat without damage, and the surface roughness Ra is less than or equal to 2.
Further, the length of the upper polar plate and the lower polar plate is 50-800 mm, the width of the upper polar plate and the lower polar plate is 40-600 mm, and the thickness of the upper polar plate and the lower polar plate is 1-20 mm.
Furthermore, the heating rod is controlled by a central control system, so that the output temperature of the upper polar plate and the lower polar plate is within a deviation range of +/-3 ℃.
Further, the withstand voltage tester is a direct current voltage tester.
Furthermore, the working voltage of the direct-current voltage tester is 0-5 KV, the voltage increasing speed is 0-500V/s, and the breakdown current capture range is 0.1-99 mA.
Further, the film to be detected is a lithium battery diaphragm.
Further, the lithium battery separator is a base film or a coating film.
The invention also provides a test method of the continuous voltage resistance of the film, which comprises a voltage resistance tester, a booster pump, an upper polar plate, a lower polar plate, an upper flexible conductive film layer, a lower flexible conductive film layer, a heating rod, a coiling and uncoiling device and a central control system; the method comprises the following steps:
(1) placing the film to be tested on a winding and unwinding device to be unwound;
(2) the pressure range provided by the booster pump is set to be 0-5 MPa through a central control system;
(3) the heating rod is set to work or not work through a central control system;
(4) setting the upper limit of detection of the intermittent advancing speed, the fixed voltage and the leakage current of the winding and unwinding device through a central control system;
(5) starting a test circuit switch to start testing;
(6) when the current value is smaller than the set upper limit value, determining OK;
(7) and when the current exceeds the set upper limit value, judging NG.
Furthermore, the booster pump is connected with the upper polar plate through a connecting shaft; the heating rod is arranged in the hole structures of the upper polar plate and the lower polar plate; the sides of the corresponding surfaces of the upper polar plate and the lower polar plate are respectively covered with an upper flexible conductive thin film layer and a lower flexible conductive thin film layer and are connected with a voltage-resistant tester through a lead; the voltage-resistant tester is connected with the central control system through the converter; the central control system controls the coiling and uncoiling device.
Further, during testing, the film to be tested is positioned between the upper flexible conductive film layer and the lower flexible conductive film layer and is in close contact with the upper flexible conductive film layer and the lower flexible conductive film layer.
Furthermore, elastic media are filled in the upper flexible conductive thin film layer and the lower flexible conductive thin film layer.
Specifically, the elastic medium is a conductive silica gel pad or conductive graphite.
Furthermore, the upper and lower polar plates are made of metal materials.
Furthermore, the metal material is stainless steel or red copper.
Furthermore, the surfaces of the upper and lower polar plates are smooth and flat without damage, and the surface roughness Ra is less than or equal to 2.
Further, the length of the upper polar plate and the lower polar plate is 50-800 mm, the width of the upper polar plate and the lower polar plate is 40-600 mm, and the thickness of the upper polar plate and the lower polar plate is 1-20 mm.
Furthermore, the heating rod is controlled by a central control system, so that the output temperature of the upper polar plate and the lower polar plate is within a deviation range of +/-3 ℃.
Further, the withstand voltage tester is a direct current voltage tester.
Furthermore, the working voltage of the direct-current voltage tester is 0-5 KV, the voltage increasing speed is 0-500V/s, and the breakdown current capture range is 0.1-99 mA.
Further, the film to be detected is a lithium battery diaphragm.
Further, the lithium battery separator is a base film or a coating film.
The invention has the following beneficial effects:
1) the invention provides a test method for continuous voltage resistance of a film, which can effectively measure the breakdown voltage value of an isolation film under the condition of pressure and heating, thereby judging whether the breakdown weak point and the position of the weak point exist or not, prejudging the subsequent battery manufacture, reducing the raw material waste in the production process of a battery core and improving the yield;
2) the invention provides a test method of continuous voltage resistance of a film, a coiled diaphragm to be tested is tightly attached to a lower polar plate, an upper polar plate is pushed to move downwards by a booster pump, and set pressure is applied to the diaphragm, finally, the voltage resistance value of a local area of the diaphragm is measured by a voltage resistance tester, the test area is reduced, the area position of a breakdown weak point can be accurately positioned, the local continuous test of the lithium battery diaphragm is realized, the test speed is higher, and meanwhile, a central control system can match the upper polar plate to move and press down to the test frequency by controlling the intermittent walking speed of winding and unwinding, so that the intermittent stable test of the diaphragm is maintained;
3) the invention provides a method for testing continuous voltage resistance of a film.A flexible conductive film of an elastic medium covers the lower surface of an upper polar plate and the upper surface of a lower polar plate, and poor contact caused by the evenness of an electrode plate or the uneven thickness of a diaphragm can be further eliminated by utilizing the high elasticity of the flexible conductive film, so that the accuracy of testing the voltage resistance value of the diaphragm of a lithium battery is improved.
Drawings
FIG. 1 is a schematic diagram of a corresponding apparatus of the testing method for continuous voltage resistance of thin film according to the present invention
Description of the element reference numerals
1 Voltage withstand tester
2 central control system
3 blower pump
4 upper polar plate
5 lower polar plate
6 heating rod
7 upper flexible conductive film layer
8 flexible conductive film layer
9 winding and unwinding device
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The specific embodiment of the invention provides a test method for continuous voltage resistance of a thin film, which comprises a voltage resistance tester 1, a booster pump 3, an upper polar plate 4, a lower polar plate 5, an upper flexible conductive thin film layer 7, a lower flexible conductive thin film layer 8, a heating rod 6, a winding and unwinding device 9 and a central control system 2, wherein the booster pump 3 is connected with the upper polar plate; the method comprises the following steps:
(1) placing the film to be tested on the winding and unwinding device 9 to be unwound;
(2) the central control system 2 sets the pressure range provided by the booster pump 3 to be 0-5 MPa;
(3) the heating rod 6 is arranged to work or not work through the central control system 2;
(4) setting the intermittent advancing speed, the boosting rate, the upper limit and/or the lower limit of breakdown current of the winding and unwinding device 9 through the central control system 2;
(5) starting a test circuit switch, boosting a program and starting a test;
(6) when the voltage-resistant tester 1 is automatically powered off and the bee rings, the test is finished, and the display voltage of the area at the moment is recorded;
(7) and continuously testing different areas of the film to be tested through the winding and unwinding device 9 to obtain the breakdown voltage data of the film.
Further, the booster pump 3 is connected with the upper polar plate 4 through a connecting shaft; the heating rod 6 is arranged in the hole structures of the upper polar plate 4 and the lower polar plate 5; the sides of the corresponding surfaces of the upper polar plate 4 and the lower polar plate 5 are respectively covered with an upper flexible conductive film layer 7 and a lower flexible conductive film layer 8, and are connected with the voltage-resistant tester 1 through a lead; the withstand voltage tester 1 is connected with the central control system 2 through a converter; the central control system 2 controls the winding and unwinding device 9.
Further, during testing, the film to be tested is positioned between the upper flexible conductive film layer 7 and the lower flexible conductive film layer 8 and is in close contact with the upper flexible conductive film layer.
Furthermore, the upper and lower flexible conductive thin film layers 7 and 8 are filled with an elastic medium.
Specifically, the elastic medium is a conductive silica gel pad or conductive graphite.
Furthermore, the upper and lower polar plates 4 and 5 are made of metal.
Furthermore, the metal material is stainless steel or red copper.
Furthermore, the surfaces of the upper polar plate 4 and the lower polar plate 5 are smooth and flat without damage, and the surface roughness Ra is less than or equal to 2.
Further, the length of the upper polar plate 4 and the lower polar plate 5 is 50-800 mm, the width is 40-600 mm, and the thickness is 1-20 mm.
Furthermore, the heating rod 6 is controlled by the central control system 2, so that the output temperature of the upper polar plate 4 and the lower polar plate 5 is within a deviation range of +/-3 ℃.
Further, the withstand voltage tester 1 is a direct current voltage tester.
Furthermore, the working voltage of the direct-current voltage tester is 0-5 KV, the voltage increasing speed is 0-500V/s, and the breakdown current capture range is 0.1-99 mA.
Further, the film to be detected is a lithium battery diaphragm.
Further, the lithium battery separator is a base film or a coating film.
The invention also provides a test method of the continuous voltage resistance of the film, which comprises a voltage resistance tester 1, a booster pump 3, an upper polar plate 4, a lower polar plate 5, an upper flexible conductive film layer 7, a lower flexible conductive film layer 8, a heating rod 6, a winding and unwinding device 9 and a central control system 2 as shown in figure 1; the method comprises the following steps:
(1) placing the film to be tested on the winding and unwinding device 9 to be unwound;
(2) the central control system 2 sets the pressure range provided by the booster pump 3 to be 0-5 MPa;
(3) the heating rod 6 is arranged to work or not work through the central control system 2;
(4) setting the intermittent advancing speed, the fixed voltage and the upper detection limit of leakage current of the winding and unwinding device 9 through the central control system 2;
(5) starting a test circuit switch to start testing;
(6) when the current value is smaller than the set upper limit value, determining OK;
(7) and when the current exceeds the set upper limit value, judging NG.
Further, the booster pump 3 is connected with the upper polar plate 4 through a connecting shaft; the heating rod 6 is arranged in the hole structures of the upper polar plate 4 and the lower polar plate 5; the sides of the corresponding surfaces of the upper polar plate 4 and the lower polar plate 5 are respectively covered with an upper flexible conductive film layer 7 and a lower flexible conductive film layer 8, and are connected with the voltage-resistant tester 1 through a lead; the withstand voltage tester 1 is connected with the central control system 2 through a converter; the central control system 2 controls the winding and unwinding device 9.
Further, during testing, the film to be tested is positioned between the upper flexible conductive film layer 7 and the lower flexible conductive film layer 8 and is in close contact with the upper flexible conductive film layer.
Furthermore, the upper and lower flexible conductive thin film layers 7 and 8 are filled with an elastic medium.
Specifically, the elastic medium is a conductive silica gel pad or conductive graphite.
Furthermore, the upper and lower polar plates 4 and 5 are made of metal.
Furthermore, the metal material is stainless steel or red copper.
Furthermore, the surfaces of the upper polar plate 4 and the lower polar plate 5 are smooth and flat without damage, and the surface roughness Ra is less than or equal to 2.
Further, the length of the upper polar plate 4 and the lower polar plate 5 is 50-800 mm, the width is 40-600 mm, and the thickness is 1-20 mm.
Furthermore, the heating rod 6 is controlled by the central control system 2, so that the output temperature of the upper polar plate 4 and the lower polar plate 5 is within a deviation range of +/-3 ℃.
Further, the withstand voltage tester 1 is a direct current voltage tester.
Furthermore, the working voltage of the direct-current voltage tester is 0-5 KV, the voltage increasing speed is 0-500V/s, and the breakdown current capture range is 0.1-99 mA.
Further, the film to be detected is a lithium battery diaphragm.
Further, the lithium battery separator is a base film or a coating film.
In addition, the method of sequentially performing the steps (1) to (4) is not limited to the two methods of testing the continuous withstand voltage of the thin film. For example, (1) - (4) may be in any order.
The present invention will be described in detail below by way of examples.
Example 1
Program boosting mode: the polar plates 4 and 5 with the size of 400 x 200 x 5 (length, width and thickness) mm are used, the temperatures of the upper polar plate 4 and the lower polar plate 5 are set to be 25 ℃ through the central control system 2, the intermittent running speed of the winding and unwinding device 9 is 10m/min, the pressure applied by the booster pump 3 is 0.2MPa, and the programmed boosting rate is 500V/s. And opening the starting test circuit and starting the winding and unwinding device 9 in sequence. The central control unit reads in real time the breakdown voltage value of each segment (400mm) of separator (12 micron PE-based film) for 1 minute and records the data in the following table, unit (V).
| 1350 | 1560 | 1216 | 1420 | 1320 |
| 1250 | 1585 | 1524 | 1462 | 1344 |
| 1660 | 1364 | 1660 | 1106 | 1130 |
| 1231 | 1431 | 1530 | 1206 | 1337 |
| 1402 | 1430 | 1060 | 1615 | 1422 |
Example 2
Program boosting mode: the polar plates 4 and 5 with the size of 400 x 200 x 5 (length, width and thickness) mm are used, the temperature of the upper polar plate 4 and the lower polar plate 5 is set to be 25 ℃ through the central control system 2, the intermittent running speed of the winding and unwinding device 9 is controlled to be 10m/min, the pressure applied by the booster pump 3 is 5MPa, and the programmed boosting speed is 500V/s. And opening the starting test circuit and starting the winding and unwinding device 9 in sequence. The central control unit reads in real time the breakdown voltage value of each segment (400mm) of separator (12 micron PE-based film) for 1 minute and records the data in the following table, unit (V).
| 550 | 395 | 485 | 350 | 256 |
| 360 | 355 | 439 | 462 | 352 |
| 360 | 423 | 335 | 306 | 460 |
| 403 | 523 | 324 | 440 | 361 |
| 532 | 351 | 295 | 387 | 286 |
Example 3
Program boosting mode: the polar plates 4 and 5 with the size of 400 x 200 x 5 (length, width and thickness) mm are used, the temperature of the upper polar plate 4 and the lower polar plate 5 is set to be 25 ℃ through the central control system 2, the intermittent running speed of the winding and unwinding device 9 is controlled to be 10m/min, the pressure applied by the booster pump 3 is 0.1KPa, and the program boosting rate is 500V/s. And opening the starting test circuit and starting the winding and unwinding device 9 in sequence. The central control unit reads in real time the breakdown voltage value of each segment (400mm) of separator (12 micron PE-based film) for 1 minute and records the data in the following table, unit (V).
| 1455 | 1460 | 1536 | 1620 | 1420 |
| 1351 | 1485 | 1501 | 1434 | 1452 |
| 1356 | 1402 | 1320 | 1158 | 1230 |
| 1241 | 1351 | 1430 | 1316 | 1437 |
| 1402 | 1430 | 1060 | 1615 | 1422 |
Example 4
Program boosting mode: the polar plates 4 and 5 with the size of 400 x 200 x 5mm (length, width and thickness) are used, the temperatures of the upper polar plate 4 and the lower polar plate 5 are set to be 45 ℃ through the central control system 2, the intermittent running speed of the winding and unwinding device 9 is 10m/min, the pressure applied by the booster pump 3 is 0.2MPa, and the programmed boosting rate is 500V/s. And opening the starting test circuit and starting the winding and unwinding device 9 in sequence. The central control unit reads in real time the breakdown voltage value of each segment (400mm) of separator (12 micron PE-based film) for 1 minute and records the data in the following table, unit (V).
| 1250 | 1450 | 1036 | 1429 | 1586 |
| 1060 | 1285 | 1524 | 1462 | 1325 |
| 1260 | 1060 | 1460 | 1106 | 950 |
| 1130 | 1420 | 1530 | 1206 | 1450 |
| 1206 | 1430 | 1320 | 1068 | 1362 |
Example 5
Program boosting mode: the polar plates 4 and 5 with the size of 400 x 200 x 5mm (length, width and thickness) are used, the temperature of the upper polar plate 4 and the lower polar plate 5 is set to be 45 ℃ through the central control system 2, the intermittent running speed of the winding and unwinding device 9 is controlled to be 10m/min, the pressure applied by the booster pump 3 is 0.8MPa, and the program boosting speed is 500V/s. And opening the starting test circuit and starting the winding and unwinding device 9 in sequence. The central control unit reads in real time the breakdown voltage value of each segment (400mm) of separator (12 micron PE-based film) for 1 minute and records the data in the following table, unit (V).
| 1050 | 1020 | 892 | 956 | 1050 |
| 1025 | 1213 | 822 | 1062 | 950 |
| 1160 | 923 | 1036 | 806 | 1059 |
| 1231 | 1310 | 950 | 1059 | 1138 |
| 1253 | 1030 | 1260 | 1284 | 859 |
Example 6
The fixed output voltage is set to be 1000V according to the central control system 2, the upper limit of leakage current detection is 5mA, a polar plate with the size of 600X 200X 5 (length, width and thickness) mm is used, the temperatures of the upper polar plate 4 and the lower polar plate 5 are set to be 45 ℃ through the central control system 2, the intermittent running speed of the winding and unwinding device 9 is controlled to be 15m/min, and the pressure applied by the booster pump 3 is 0.2 MPa. And opening the starting test circuit and starting the winding and unwinding device 9 in sequence. The central control unit displays in real time the withstand voltage characteristics of each section (400mm) of diaphragm (12 micron PE-based membrane), and by displaying OK, NG is displayed once the weak point is broken down, for 1 minute and the data are recorded in the following table, unit (V).
| On screen display status | Voltage of | On screen display status | Voltage of |
| OK | 1305 | OK | 1053 |
| OK | 1402 | OK | 1062 |
| OK | 1250 | OK | 1230 |
| OK | 1106 | OK | 1430 |
| OK | 1460 | OK | 1130 |
| OK | 1382 | OK | 1456 |
| OK | 1120 | OK | 1482 |
| OK | 1026 | OK | 1530 |
| OK | 1536 | OK | 1205 |
| OK | 1486 | NG | 920 |
| OK | 1320 | OK | 1360 |
| OK | 1395 | OK | 1264 |
| OK | 1438 |
Example 7
Program boosting mode: the polar plates 4 and 5 with the size of 400 x 200 x 5 (length, width and thickness) mm are used, the temperature of the upper polar plate 4 and the lower polar plate 5 is set to be 45 ℃ through the central control system 2, the intermittent running speed of the winding and unwinding device 9 is controlled to be 10m/min, the pressure applied by the booster pump 3 is 0.2MPa, and the program boosting speed is 500V/s. And opening the starting test circuit and starting the winding and unwinding device 9 in sequence. The central control unit reads in real time the breakdown voltage value of each segment (400mm) of separator (12 micron PE base film coated with 4 micron ceramic layer) for 1 minute and records the data in the following table, unit (V).
| 1550 | 1395 | 1489 | 1652 | 1429 |
| 1660 | 1359 | 1439 | 1462 | 1562 |
| 1560 | 1623 | 1435 | 1306 | 1460 |
| 1503 | 1623 | 1624 | 1540 | 1361 |
| 1653 | 1352 | 1299 | 1587 | 1468 |
The above matters related to the common general knowledge are not described in detail and can be understood by those skilled in the art.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (13)
1. A test method for continuous voltage resistance of a thin film is characterized by comprising a voltage resistance tester, a booster pump, an upper polar plate, a lower polar plate, an upper flexible conductive thin film layer, a lower flexible conductive thin film layer, a heating rod, a winding and unwinding device and a central control system, wherein the booster pump is connected with the upper polar plate through a connecting shaft, the heating rod is arranged in a hole structure of the upper polar plate and the lower polar plate, one side of the corresponding surface of the upper polar plate and one side of the corresponding surface of the lower polar plate are respectively covered with the upper flexible conductive thin film layer and the lower flexible conductive thin film layer, the upper polar plate and the lower polar plate are connected with the voltage resistance tester through leads, the voltage resistance tester is connected with the central control system through a converter, and the; the test method comprises the following steps:
(1) placing the film to be tested on a winding and unwinding device to be unwound;
(2) the pressure range provided by the booster pump is set to be 0.2-5 MPa through a central control system;
(3) setting a heating rod to work through a central control system;
(4) setting the intermittent advancing speed, the boosting rate, the upper limit and/or the lower limit of breakdown current of the coiling and uncoiling device through a central control system;
(5) sequentially starting a test circuit switch to carry out program boosting, starting a winding and unwinding device to start testing, and during testing, positioning a film to be tested between the upper flexible conductive film layer and the lower flexible conductive film layer and closely contacting the film to be tested;
(6) when the voltage-resistant tester is automatically powered off and the bee rings, ending the test and recording the display voltage of a region at the moment;
(7) and continuously testing different areas of the film to be tested through the winding and unwinding device to obtain the breakdown voltage data of the film.
2. The method for testing continuous withstand voltage of thin film according to claim 1, wherein: elastic media are filled in the upper flexible conductive thin film layer and the lower flexible conductive thin film layer.
3. The method for testing continuous withstand voltage of thin film according to claim 2, wherein: the elastic medium is a conductive silica gel pad or conductive graphite.
4. The method for testing continuous withstand voltage of thin film according to claim 1, wherein: the upper polar plate and the lower polar plate are both made of metal materials.
5. The method for testing continuous withstand voltage of thin film according to claim 4, wherein: the metal material is stainless steel or red copper.
6. The method for testing continuous withstand voltage of thin film according to claim 1, wherein: the surfaces of the upper and lower polar plates are smooth and flat without damage, and the surface roughness Ra is less than or equal to 2.
7. The method for testing continuous withstand voltage of thin film according to claim 1, wherein: the length of the upper polar plate and the lower polar plate is 50-800 mm, the width is 40-600 mm, and the thickness is 1-20 mm.
8. The method for testing continuous withstand voltage of thin film according to claim 1, wherein: the heating rod is controlled by a central control system, so that the output temperature of the upper polar plate and the lower polar plate is within a deviation range of +/-3 ℃.
9. The method for testing continuous withstand voltage of thin film according to claim 1, wherein: the voltage-resistant tester is a direct-current voltage tester.
10. The method for testing continuous withstand voltage of thin film according to claim 9, wherein: the working voltage of the direct-current voltage tester is 0-5 KV, the voltage increasing speed is 0-500V/s, and the breakdown current capture range is 0.1-99 mA.
11. The method for testing continuous withstand voltage of thin film according to claim 1, wherein: the film to be detected is a lithium battery diaphragm.
12. The method for testing continuous withstand voltage of thin film according to claim 11, wherein: the lithium battery diaphragm is a base film or a coating film.
13. A test method for continuous voltage resistance of a thin film is characterized by comprising a voltage resistance tester, a booster pump, an upper polar plate, a lower polar plate, an upper flexible conductive thin film layer, a lower flexible conductive thin film layer, a heating rod, a winding and unwinding device and a central control system, wherein the booster pump is connected with the upper polar plate through a connecting shaft, the heating rod is arranged in a hole structure of the upper polar plate and the lower polar plate, one side of the corresponding surface of the upper polar plate and one side of the corresponding surface of the lower polar plate are respectively covered with the upper flexible conductive thin film layer and the lower flexible conductive thin film layer, the upper polar plate and the lower polar plate are connected with the voltage resistance tester through leads, the voltage resistance tester is connected with the central control system through a converter, and the; the test method comprises the following steps:
(1) placing the film to be tested on a winding and unwinding device to be unwound;
(2) the pressure range provided by the booster pump is set to be 0.2-5 MPa through a central control system;
(3) setting a heating rod to work through a central control system;
(4) setting the upper limit of detection of the intermittent advancing speed, the fixed voltage and the leakage current of the winding and unwinding device through a central control system;
(5) sequentially starting a test circuit switch, starting a winding and unwinding device, starting the test, and positioning the film to be tested between the upper flexible conductive film layer and the lower flexible conductive film layer and closely contacting the film to be tested during the test;
(6) when the current value is smaller than the set upper limit value, determining OK;
(7) and when the current exceeds the set upper limit value, judging NG.
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| CN202010707447.8A CN111812470B (en) | 2020-07-21 | 2020-07-21 | Method for testing continuous voltage resistance of film |
| PCT/CN2021/088079 WO2022016923A1 (en) | 2020-07-21 | 2021-04-19 | Method for continuous testing of voltage resistance of thin film |
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| CN111812470B (en) * | 2020-07-21 | 2021-05-04 | 上海恩捷新材料科技有限公司 | Method for testing continuous voltage resistance of film |
| CN113008942A (en) * | 2021-03-04 | 2021-06-22 | 上海恩捷新材料科技有限公司 | Method and system for detecting dispersibility of coating film coating slurry |
| CN114779032B (en) * | 2022-06-22 | 2022-09-30 | 深圳市博盛新材料有限公司 | Breakdown voltage testing device for lithium ion battery diaphragm |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090217A (en) * | 2014-07-10 | 2014-10-08 | 深圳市星源材质科技股份有限公司 | Separator breakdown voltage testing device and method |
| CN205507003U (en) * | 2015-11-24 | 2016-08-24 | 上海恩捷新材料科技股份有限公司 | Battery separator withstand voltage test anchor clamps |
| CN207366690U (en) * | 2017-11-13 | 2018-05-15 | 上海恩捷新材料科技股份有限公司 | A kind of device for testing membrane breakdown voltage |
| CN108627387A (en) * | 2018-06-28 | 2018-10-09 | 桑德集团有限公司 | A kind of test method of battery diaphragm puncture resistant ability and test combine the unit |
| CN208188252U (en) * | 2018-04-03 | 2018-12-04 | 上海恩捷新材料科技股份有限公司 | Lithium ion battery separator breakdown voltage test system and system |
| CN208818795U (en) * | 2018-09-17 | 2019-05-03 | 江苏安瑞达新材料有限公司 | The test device of lithium battery diaphragm withstand voltage value |
| WO2019095258A1 (en) * | 2017-11-17 | 2019-05-23 | 太仓市何氏电路板有限公司 | Pressure resistance test platform for aluminum substrate |
| CN210427706U (en) * | 2019-06-18 | 2020-04-28 | 江苏厚生新能源科技有限公司 | Testing device for detecting breakdown voltage of diaphragm |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60115846A (en) * | 1983-11-29 | 1985-06-22 | Hitachi Ltd | Method and device for inspection of insulating thin film |
| JP5764011B2 (en) * | 2011-08-24 | 2015-08-12 | 株式会社東芝 | Evaluation method of dielectric breakdown voltage of multi-component alloys |
| CN209784507U (en) * | 2018-12-27 | 2019-12-13 | 中兴高能技术有限责任公司 | Diaphragm testing device and diaphragm testing system |
| CN111077422A (en) * | 2019-12-31 | 2020-04-28 | 河北金力新能源科技股份有限公司 | Lithium ion battery diaphragm breakdown strength testing device and testing method thereof |
| CN212808485U (en) * | 2020-07-21 | 2021-03-26 | 上海恩捷新材料科技有限公司 | Testing arrangement of continuous withstand voltage of film |
| CN111812470B (en) * | 2020-07-21 | 2021-05-04 | 上海恩捷新材料科技有限公司 | Method for testing continuous voltage resistance of film |
-
2020
- 2020-07-21 CN CN202010707447.8A patent/CN111812470B/en active Active
-
2021
- 2021-04-19 WO PCT/CN2021/088079 patent/WO2022016923A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090217A (en) * | 2014-07-10 | 2014-10-08 | 深圳市星源材质科技股份有限公司 | Separator breakdown voltage testing device and method |
| CN205507003U (en) * | 2015-11-24 | 2016-08-24 | 上海恩捷新材料科技股份有限公司 | Battery separator withstand voltage test anchor clamps |
| CN207366690U (en) * | 2017-11-13 | 2018-05-15 | 上海恩捷新材料科技股份有限公司 | A kind of device for testing membrane breakdown voltage |
| WO2019095258A1 (en) * | 2017-11-17 | 2019-05-23 | 太仓市何氏电路板有限公司 | Pressure resistance test platform for aluminum substrate |
| CN208188252U (en) * | 2018-04-03 | 2018-12-04 | 上海恩捷新材料科技股份有限公司 | Lithium ion battery separator breakdown voltage test system and system |
| CN108627387A (en) * | 2018-06-28 | 2018-10-09 | 桑德集团有限公司 | A kind of test method of battery diaphragm puncture resistant ability and test combine the unit |
| CN208818795U (en) * | 2018-09-17 | 2019-05-03 | 江苏安瑞达新材料有限公司 | The test device of lithium battery diaphragm withstand voltage value |
| CN210427706U (en) * | 2019-06-18 | 2020-04-28 | 江苏厚生新能源科技有限公司 | Testing device for detecting breakdown voltage of diaphragm |
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