CN112415348A - Lithium ion battery diaphragm breakdown voltage testing device and testing method - Google Patents
Lithium ion battery diaphragm breakdown voltage testing device and testing method Download PDFInfo
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- CN112415348A CN112415348A CN202011414123.1A CN202011414123A CN112415348A CN 112415348 A CN112415348 A CN 112415348A CN 202011414123 A CN202011414123 A CN 202011414123A CN 112415348 A CN112415348 A CN 112415348A
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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
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Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery diaphragm breakdown voltage testing device which comprises a pulse high-voltage short circuit tester, an upper insulating plate, a positive plate, a negative plate, a diaphragm to be tested and a lower insulating plate for fixing a winding core, wherein the positive plate, the negative plate and the diaphragm to be tested are assembled into the winding core in a winding mode; the first wire led out by the pulse high-voltage short-circuit tester is connected with the positive plate, and the second wire is connected with the negative plate. The test method comprises the following steps: s1, adjusting the pressure of the upper insulating plate to be pressurized, opening a switch of a pulse high-voltage short-circuit tester, and starting testing; s2, if the diaphragm to be tested is broken down, the pulse high-voltage short-circuit tester detects leakage current and gives an alarm, the test is finished, and the breakdown voltage value at the moment is recorded; and S3, repeating the tests, taking an average value, and screening the diaphragm. The invention has reliable breakdown voltage test result, effectively screens the diaphragm, prevents the generation of defective products, reduces the production cost and eliminates potential safety hazard.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a device and a method for testing the breakdown voltage of a lithium ion battery diaphragm.
Background
Due to good chemical stability and excellent physical properties, microporous polyethylene films are widely used in secondary lithium ion batteries, such as mobile phone batteries, notebook batteries, electric tool batteries, power automobile batteries, and the like. In the lithium ion battery, the diaphragm mainly has the function of separating the positive electrode and the negative electrode of the battery and preventing the short circuit caused by the contact of the two electrodes; in a general battery processing process, since dust and burrs of the positive electrode and the negative electrode are factors which are easy to cause short circuit, a general lithium ion battery manufacturer can test the short circuit under high voltage after completing a battery cell assembly process so as to select a battery cell which is easy to be short-circuited.
In the prior art, the Chinese patent with the publication number of CN104090217A adopts a static direct current test mode, so that the test time is long and the efficiency is low; in the chinese patent publication No. CN210427706U, the test object is a point or a partial surface of the membrane surface, and in practical applications, the membrane generally exists in the battery in a large area in a roll manner, and if the minimum breakdown voltage in the membrane with a large area is to be analyzed, repeated sampling and testing are required, which is tedious to operate; the existing testing method is simple, and in practical application considered in America, the interaction relationship between the diaphragm and the pole piece in the manufacturing process, such as pole piece powder falling, equipment foreign matters, core pressurization shaping, and the foreign matters and pressurization have influence on the diaphragm breakdown voltage test.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the lithium ion battery diaphragm breakdown voltage testing device which is simple and convenient to operate, high in detection accuracy and capable of being independently completed by one person.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a lithium ion battery diaphragm breakdown voltage testing device comprises a pulse high-voltage short circuit tester, an upper insulation board for pressurizing a test sample, a positive plate coated with active substances on two sides, a negative plate coated with active substances on two sides, a diaphragm to be tested and a lower insulation board for fixing a winding core, wherein the positive plate, the negative plate and the diaphragm to be tested are assembled into the winding core in a winding mode; and a first wire led out by the pulse high-voltage short circuit tester is connected with the positive plate, and a second wire is connected with the negative plate.
Further, the upper insulating plate is parallel to the lower insulating plate.
Furthermore, the first wire and the second wire are arranged in parallel with the upper insulating plate and the lower insulating plate.
Further, the exceeding distance of the negative plate covered by the diaphragm to be tested is as follows: 1-3 mm.
Further, the exceeding distance of the negative plate coating the positive plate is as follows: 1-3 mm.
Further, the number of layers of the winding core is: 5 to 30 layers.
Based on one general inventive concept, another object of the present invention is to provide a testing method of the above lithium ion battery separator breakdown voltage testing apparatus, comprising the following steps:
s1, adjusting the pressure for pressurizing an upper insulating plate, opening a switch of a pulse high-voltage short-circuit tester, and starting testing;
s2, if the diaphragm to be tested is broken down, the pulse high-voltage short-circuit tester detects leakage current and gives an alarm, the test is finished, and the breakdown voltage value at the moment is recorded;
and S3, repeating the test, recording a plurality of breakdown voltage values, taking an average value, and screening the diaphragm.
Further, in step S1, the pressure range: 0-1 MPa, pressurizing time: 10 to 60 seconds.
Further, the setting conditions of the pulse high-voltage short-circuit tester, the starting voltage: 0-100V, termination voltage: 0.1-4 KV, step voltage: 1-10V, charging time: 10-1000 ms, interval time: 10 to 1000 ms.
Compared with the prior art, the invention adopts the pulse high-voltage short-circuit tester, can scan the voltage from 0V to 4KV according to certain step voltage in a very short time, and can detect the breakdown voltage value which is difficult to detect in a normal state in a very short time; the measuring device can apply constant pressure, the pressing time is controllable, the test object is a roll core and comprises a positive plate, a negative plate and a diaphragm, the detection condition of breakdown voltage in the actual manufacturing process is close to, the detection condition is consistent with the application environment of the diaphragm in the lithium ion battery, the breakdown voltage test result is reliable, the diaphragm can be effectively screened, the generation of defective products is prevented, the production cost is reduced, and the potential safety hazard that the diaphragm is broken down in the later-stage charging and discharging process is eliminated.
Drawings
FIG. 1 is a schematic diagram of the general structure of a lithium ion battery separator breakdown voltage testing device of the present invention;
FIG. 2 shows a specific structure of a winding core (wherein each black dot is a protruding tab, and the tab is welded and then connected to a pulsed high voltage short circuit tester);
the designations in FIGS. 1-2 have the following meanings: 1-pulse high-voltage short circuit tester, 2-upper insulating plate, 3-positive plate, 4-negative plate, 5-diaphragm to be tested, 6-lower insulating plate, 7-first wire and 8-second wire.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Example 1
A lithium ion battery diaphragm breakdown voltage testing device is shown in figure 1-2 and comprises a pulse high-voltage short circuit tester 1, an upper insulating plate 2 for pressurizing a test sample, a positive plate 3 with two sides coated with active substances, a negative plate 4 with two sides coated with active substances, a diaphragm 5 to be tested and a lower insulating plate 6 for fixing a winding core, wherein the positive plate 3, the negative plate 4 and the diaphragm 5 to be tested are assembled into the winding core in a winding mode; and a first lead 7 led out by the pulse high-voltage short circuit tester 1 is connected with the positive plate 3, and a second lead 8 is connected with the negative plate 4.
The upper insulating plate 2 is parallel to the lower insulating plate 6, and the first lead wire 7 and the second lead wire 8 are both arranged in parallel to the upper insulating plate 2 and the lower insulating plate 6.
Specifically, the structure of roll core is by one deck positive plate 3, and the intermediate level is the diaphragm 5 that awaits measuring, and the one deck is that negative pole piece 4 constitutes again, and the three-layer is convoluteed, forms 3 cladding negative pole pieces 4 of positive plate, and negative pole piece 4 wraps the structure of positive plate 3 again, and during the ending, the distance that negative pole piece 4 exceeds positive plate 3 is for surpassing the distance.
The test that awaits measuring diaphragm 5 cladding the distance that surpasss of negative pole piece 4 is 2mm, the distance that surpasss of the positive plate 3 of 4 cladding of negative pole pieces is 2mm, the number of piles of rolling up the core is 16 layers, presses close to the true state of diaphragm in the battery is made, and measured breakdown voltage numerical value is more accurate.
Example 2
The testing method of the lithium ion battery separator breakdown voltage testing device in embodiment 1 includes the following steps:
s1, adjusting the pressure for pressurizing the upper insulating plate 2, wherein the pressure range is as follows: 0-1 MPa, pressurizing time: 35s, the measured breakdown voltage value is more accurate when the actual state of the diaphragm in the battery manufacturing process is approached;
opening a switch of the pulse high-voltage short-circuit tester 1 to start testing;
wherein, the setting conditions of the pulse high-voltage short circuit tester 1, the initial voltage: 50V, end voltage: 2.5KV, step voltage: 5V, charging time: 500ms, interval: 500ms, a breakdown voltage value which is difficult to detect in a normal state can be detected in an extremely short time.
S2, if the diaphragm 5 to be tested is broken down, the pulse high-voltage short-circuit tester 1 detects leakage current and gives an alarm, the test is finished, and the breakdown voltage value at the moment is recorded;
and S3, repeating the test, recording six breakdown voltage values, taking an average value, and screening the diaphragm.
The invention adopts a pulse high-voltage short-circuit tester, can scan the voltage from 0V to 4KV according to certain step voltage in a very short time, and can detect the breakdown voltage value which is difficult to detect in a normal state in a very short time; the measuring device can apply constant pressure, the pressing time is controllable, the test object is a roll core and comprises a positive plate, a negative plate and a diaphragm, the detection condition of breakdown voltage in the actual manufacturing process is close to, the detection condition is consistent with the application environment of the diaphragm in the lithium ion battery, the breakdown voltage test result is reliable, the diaphragm can be effectively screened, the generation of defective products is prevented, the production cost is reduced, and the potential safety hazard that the diaphragm is broken down in the later-stage charging and discharging process is eliminated.
The above embodiments are merely preferred embodiments of the present invention, and any simple modification, modification and substitution changes made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. The device for testing the breakdown voltage of the lithium ion battery diaphragm is characterized by comprising a pulse high-voltage short circuit tester (1), an upper insulating plate (2) for pressurizing a test sample, a positive plate (3) with active substances coated on two sides, a negative plate (4) with active substances coated on two sides, a diaphragm (5) to be tested and a lower insulating plate (6) for fixing a winding core, wherein the positive plate (3), the negative plate (4) and the diaphragm (5) to be tested are assembled into the winding core in a winding mode; and a first lead (7) led out by the pulse high-voltage short circuit tester (1) is connected with the positive plate (3), and a second lead (8) is connected with the negative plate (4).
2. The lithium ion battery separator breakdown voltage testing device according to claim 1, wherein the upper insulating plate (2) is parallel to the lower insulating plate (6).
3. The lithium ion battery separator breakdown voltage testing device according to claim 2, wherein the first wire (7) and the second wire (8) are arranged in parallel with the upper insulating plate (2) and the lower insulating plate (6).
4. The lithium ion battery separator breakdown voltage testing device according to any one of claims 1 to 3, wherein the exceeding distance of the negative electrode sheet (4) covered by the separator (5) to be tested is as follows: 1-3 mm.
5. The lithium ion battery separator breakdown voltage testing device according to claim 4, wherein the negative plate (4) covers the positive plate (3) for an excess distance: 1-3 mm.
6. The device for testing the breakdown voltage of the lithium ion battery separator according to claim 5, wherein the number of the winding cores is as follows: 5 to 30 layers.
7. The testing method of the lithium ion battery separator breakdown voltage testing device of claim 6, characterized by comprising the following steps:
s1, adjusting the pressure for pressurizing an upper insulating plate (2), opening a switch of a pulse high-voltage short-circuit tester (1), and starting testing;
s2, if the diaphragm (5) to be tested is broken down, the pulse high-voltage short-circuit tester (1) detects leakage current and gives an alarm, the test is finished, and the breakdown voltage value at the moment is recorded;
and S3, repeating the test, recording a plurality of breakdown voltage values, taking an average value, and screening the diaphragm.
8. The lithium ion battery separator breakdown voltage testing method according to claim 7, wherein in step S1, the pressure range is: 0-1 MPa, pressurizing time: 10 to 60 seconds.
9. The lithium ion battery diaphragm breakdown voltage testing method according to claim 7, wherein the set conditions of the pulse high voltage short circuit tester (1) are that the initial voltage: 0-100V, termination voltage: 0.1-4 KV, step voltage: 1-10V, charging time: 10-1000 ms, interval time: 10 to 1000 ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011414123.1A CN112415348A (en) | 2020-12-04 | 2020-12-04 | Lithium ion battery diaphragm breakdown voltage testing device and testing method |
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| CN202011414123.1A CN112415348A (en) | 2020-12-04 | 2020-12-04 | Lithium ion battery diaphragm breakdown voltage testing device and testing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900022A (en) * | 2021-09-13 | 2022-01-07 | 东莞市创明电池技术有限公司 | Method for determining position of short-circuit point of winding core |
| CN113967609A (en) * | 2021-10-09 | 2022-01-25 | 上海空间电源研究所 | Screening and matching method of high-power lithium ion batteries for carrier rocket |
| CN114779032A (en) * | 2022-06-22 | 2022-07-22 | 深圳市博盛新材料有限公司 | Breakdown voltage testing device for lithium ion battery diaphragm |
-
2020
- 2020-12-04 CN CN202011414123.1A patent/CN112415348A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900022A (en) * | 2021-09-13 | 2022-01-07 | 东莞市创明电池技术有限公司 | Method for determining position of short-circuit point of winding core |
| CN113967609A (en) * | 2021-10-09 | 2022-01-25 | 上海空间电源研究所 | Screening and matching method of high-power lithium ion batteries for carrier rocket |
| CN113967609B (en) * | 2021-10-09 | 2023-11-17 | 上海空间电源研究所 | Screening and grouping method of high-power lithium ion battery for carrier rocket |
| CN114779032A (en) * | 2022-06-22 | 2022-07-22 | 深圳市博盛新材料有限公司 | Breakdown voltage testing device for lithium ion battery diaphragm |
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