CN110608860A - Method for detecting air tightness of soft package battery - Google Patents
Method for detecting air tightness of soft package battery Download PDFInfo
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- CN110608860A CN110608860A CN201910837198.1A CN201910837198A CN110608860A CN 110608860 A CN110608860 A CN 110608860A CN 201910837198 A CN201910837198 A CN 201910837198A CN 110608860 A CN110608860 A CN 110608860A
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- battery
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- airtightness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/36—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested
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- General Physics & Mathematics (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a method for detecting the air tightness of a soft package battery, which aims to provide a detection method with high detection efficiency and high detection precision. a. Detecting the height values of a plurality of groups of point positions on the surface of the battery by using a non-contact battery thickness measuring method; b. placing the battery to be tested in a working cavity, and vacuumizing; c. filling positive pressure into the working chamber; d. step b and step c are circulated for multiple times; e. detecting the height value of the same point on the surface of the battery again by using a non-contact battery thickness measurement method; f. and establishing a battery leakage standard, and comparing the difference values of the same point position height before and after the inflation of the battery to be tested.
Description
Technical Field
The invention relates to the field of flexible package battery airtightness detection, in particular to a method for detecting the airtightness of a flexible package battery.
Background
With the rapid development of the lithium battery industry, the lithium battery is widely produced and used in various industries at present, sealing detection must be carried out after the battery packaging is finished according to the requirements of the production process, and due to the technical limitation, the sealing detection can only be effectively carried out on hard-package batteries at present, and the sealing detection means for soft-package batteries is still in the bottleneck stage.
The prior art measures have the defects and shortcomings of the sealing inspection of the flexible package battery:
air leakage detection: various differential pressure comparison modes including internal pressure measurement, external pressure measurement, volume measurement, deformation measurement and the like cannot eliminate the influence of air pressure on the shape of the flexible package and the change of the volume. Such as: in the process of flexible package test inflation or exhaust, the volume of the flexible package can be changed due to the change of external pressure, and when the product has defects, the volume and the pressure in the package can be changed, so that the pressure detection effect or the volume detection effect is not obvious, and the flexible package battery volume detection device cannot be suitable for batch, efficient and stable detection of flexible package batteries on a production line.
A halogen detection method and VOC detection: whether the gas and the liquid leak or not is judged by analyzing specific molecules and elements of the volatile gas and the liquid, and the method cannot be used because residues exist in a cavity and the inside of an instrument.
③ helium gas detection method: the detection cost of the method is too high, and the economic benefit of enterprises is not facilitated.
At present, chinese patent publication No. CN109186877A discloses a battery airtightness detection process, which includes the following steps: (1) filling a helium small cavity and closing the cavity: pressing the lower pressing head downwards to form a helium injection small cavity with the battery cover plate in a pressing mode, and containing the welded liquid injection hole into the small cavity; (2) injecting helium into the cavity to a certain pressure value; (3) helium pumping is carried out on the cavity: a. the cover cap leaks slightly, and helium gas is reserved in the cover cap after the cavity is pumped with helium; b. the cap is large in leakage, helium in the cap is pumped away after the cavity is pumped out, and the helium permeating into the sealing rubber plug is remained on the rubber plug; (4) and performing helium detection on the cavity, and judging that the battery is leaked when the reading is greater than a specified value.
Although the detection process has high detection accuracy and saves the use of helium to a great extent, the detection process comprises the following steps: the helium gas is still high in cost for detecting the air tightness of the soft package battery, other detection methods in the market can only be well adapted to the hard package battery, and no accurate and rapid detection method exists for detecting the air tightness of the soft package battery.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a method for detecting the air tightness of a soft package battery.
The technical scheme of the invention is further defined as follows:
the method for detecting the air tightness of the soft package battery comprises a battery to be detected and a working cavity for placing the battery to be detected, and is characterized by comprising the following steps of:
a. detecting the height values of a plurality of groups of point positions on the surface of the battery by using a non-contact battery thickness measuring method;
b. placing the battery to be tested in a working cavity, and vacuumizing;
c. filling high-pressure gas into the working chamber;
d. circulating the step b and the step c, and carrying out pulse inflation on the interior of the battery for 3-20 times in total;
e. measuring the height values of a plurality of groups of same point positions on the surface of the battery again at the same position by using a non-contact battery thickness measuring method;
f. and establishing a battery leakage standard, and comparing difference values of the heights of the multiple groups of point positions before and after the inflation of the battery to be tested.
Further, the step b also comprises an electromagnetic valve SV1 communicated with the working cavity, the electromagnetic valve SV1 is opened, the vacuum of 0 ~ -99Kpa is filled into the working cavity, the air filling time lasts for 0.3-2s, and the electromagnetic valve SV1 is closed.
Further, the step c further comprises an electromagnetic valve SV2 communicated with the working chamber, the electromagnetic valve SV1 is kept in a closed state, the electromagnetic valve SV2 is opened, high-pressure gas is filled into the working chamber, the filling time lasts for 0.3-2s, and the electromagnetic valve SV2 is closed.
Further, the step a further includes taking multiple groups of test point locations from the surface of the battery to be tested, the test point locations are sequentially marked as A, B, C and d.
Furthermore, when the gas pressure in the working cavity is changed, the gas acts on the surface of the battery to be tested, the gas enters the battery to be tested through a leakage port of the battery to be tested, the aluminum-plastic film wrapped on the surface of the battery to be tested is separated from the battery to be tested, and the aluminum-plastic film bulges relative to the surface of the battery to be tested.
Furthermore, the step f further comprises the steps of detecting by using a plurality of groups of batteries without leakage, establishing a standard model, selecting the maximum difference value in the height change of the batteries as a reference point, and setting a proper value as a leakage judgment standard.
Furthermore, the detection method mainly uses a non-contact type to measure the surface displacement change of the soft package battery.
Furthermore, the numerical value of the non-contact measurement is compared by data, and the measurement is carried out by using the same position point before and after the data comparison.
The invention has the beneficial effects that:
(1) in the invention, positive pressure and negative pressure alternately act on the working cavity to realize pulsating inflation in the battery, and sufficient pressure change in the working cavity is ensured through multiple cycles, thereby being beneficial to the bulging of the aluminum plastic film on the surface of the battery to be tested.
(2) According to the invention, the variation differences of the heights of multiple groups of point positions of multiple groups of standard batteries are measured in the early stage, a perfect standard model is established, a proper leakage standard is selected, the variation differences of the heights of multiple groups of the same point positions of the batteries to be detected are measured in the later stage and are compared with the leakage standard, a direct detection method is avoided, a non-contact detection method is adopted, and the detection efficiency is higher.
(3) In the invention, the non-contact battery thickness measurement method is used for detection, the detection mode is instantaneous detection, and the detection mode is calculated and judged by an equipment program, so that the efficiency is improved, and the detection accuracy and the data reliability are ensured.
(4) In the invention, the detection and judgment standard adopts mass test, and the stable domain width intermediate value is taken, so that the data is more reasonable.
Drawings
FIG. 1 is a flowchart of a detection method in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a pouch battery in example 1 of the present invention;
fig. 3 is a block connection diagram of embodiment 1 of the present invention.
In the figure, 1, a battery to be tested; 2. a working chamber; 3. and (3) an aluminum plastic film.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: as shown in fig. 1, 2 and 3, the method for detecting the airtightness of the soft package battery mainly comprises the following steps:
step S1: selecting four test point positions at two ends of the surface of the battery 1 to be tested, respectively marking the test point positions as a point position A, a point position B, a point position C and a point position D, respectively distributing the point position A and the point position B at the upper end and the lower end of the left side of the battery 1 to be tested, respectively distributing the point position C and the point position D at the upper end and the lower end of the right side of the battery 1 to be tested, covering the point position A, the point position B, the point position C and the point position D on four corners of the surface of the battery 1 to be tested, respectively measuring the thicknesses of the batteries at the point positions A, the point position B, the point position.
Step S2: after the measurement is finished, the standard battery is placed in the sealed working cavity 2, the electromagnetic valve SV1 is opened, the gas in the cavity is pumped out by using a vacuum pump, namely, the vacuum pump is used for filling-90 Kpa air into the working cavity 2 for 0.3-2s, the electromagnetic valve SV1 is closed, the electromagnetic valve SV2 is opened, then the positive pressure of 0.1-0.6Mpa air is filled into the cavity for 0.3-2s, and then the electromagnetic valve SV2 is closed.
Step S3: the standard battery does not need to be moved out of the working cavity 2, the step S2 is continuously repeated, the step S23-20 times is repeated in total, air of the standard battery without leakage is exhausted before packaging, the change of the gas pressure in the cavity simultaneously acts on all the surfaces of the standard battery, the influence on the surface and volume change of the standard battery is small, and the thickness of the surface of the standard battery cannot be greatly changed.
Step S4: moving the standard battery from the working cavity 2 to a detection initial position, respectively measuring a point position A, a point position B, a point position C and a point position D by using a non-contact battery thickness measuring method, recording battery thickness data of the four point positions, calculating a thickness variation difference value among the point positions of the standard battery, measuring a plurality of groups of standard batteries, finally establishing a standard model, and selecting a proper value as a leakage standard.
Step S5: and repeating the step S1, replacing the standard battery with the test battery, taking the four point positions on the surface of the test battery, which are the same as the surface of the standard battery, measuring the thicknesses of the four point positions according to the step S1, and recording initial data.
Step S6: and step S2 is repeated to replace the test target with the standard battery.
Step S7: repeating the step S3, replacing the standard battery with the test battery, wherein if the test battery has a leakage condition, the aluminum-plastic film 3 packaged on the surface of the test battery will be separated from the test battery, and air will enter the test battery through the leakage opening, so that the aluminum-plastic film 3 packaged on the surface of the test battery will bulge, and the thickness of the battery at the leakage position will change.
Step S8: and respectively measuring the thicknesses of four point positions of the test battery by using a non-contact battery thickness measuring method, recording and calculating the variation difference between the point positions, comparing the battery to be tested with the leakage standard, and determining whether the battery is a leakage battery.
Table 1 shows the test condition of the standard cell, and table 2 shows the test condition of the leaky cell.
TABLE 1
| Measuring point | Data X | Data Y | Variation difference |
| A2 | 0.190 | 0.193 | 0.003 |
| B2 | 0.213 | 0.208 | -0.005 |
| C2 | 2.688 | 2.703 | 0.015 |
| D2 | 0.535 | 0.502 | -0.033 |
TABLE 2
| Measuring point | Data X | Data Y | Variation difference |
| A1 | 1.236 | 1.458 | 0.222 |
| B1 | 0.065 | 0.687 | 0.622 |
| C1 | 1.313 | 1.411 | 0.098 |
| D1 | 0.028 | 0.665 | 0.637 |
Through multiple groups of data, verification and comparison, the median of the maximum change values in the tables 1 and 2 is selected as a standard value for judging whether the battery leaks, and if the maximum value (maximum value in 4 points) of the leaked battery change difference value is 0.4-1.3 every time, and the maximum value (maximum value in 4 points) of the non-leaked battery change difference value is 0.10 every time, the median 0.25 of 0.10-0.4 can be taken as the leakage judgment standard of the battery.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.
Claims (8)
1. The method for detecting the air tightness of the soft package battery comprises a battery to be detected and a working cavity for placing the battery to be detected, and is characterized by comprising the following steps of:
a. detecting the height values of a plurality of groups of point positions on the surface of the battery by using a non-contact battery thickness measuring method;
b. placing the battery to be tested in a working cavity, and vacuumizing;
c. filling high-pressure gas into the working chamber;
d. circulating the step b and the step c, and carrying out pulse inflation on the interior of the battery for 2-30 times in total;
e. measuring the height values of a plurality of groups of same point positions on the surface of the battery again at the same position by using a non-contact battery thickness measuring method;
f. and establishing a battery leakage standard, and comparing difference values of the heights of the multiple groups of point positions before and after the inflation of the battery to be tested.
2. The method for detecting the airtightness of the soft-package battery according to claim 1, wherein the step b further comprises a solenoid valve SV1 communicated with the working chamber, the solenoid valve SV1 is opened, a vacuum of 0 ~ -99Kpa is filled into the working chamber, the filling time lasts for 0.3-2s, and the solenoid valve SV1 is closed.
3. The method for detecting the airtightness of the soft package battery according to claim 2, is characterized in that: and c, an electromagnetic valve SV2 communicated with the working cavity is further included, the electromagnetic valve SV1 is kept in a closed state, the electromagnetic valve SV2 is opened, high-pressure gas is filled into the working cavity for 0.3-2s, and the electromagnetic valve SV2 is closed.
4. The method for detecting the airtightness of the soft package battery according to claim 3, is characterized in that: the method comprises the following steps that a plurality of groups of test point positions are taken from the surface of the battery to be tested, the test point positions are marked as A, B, C and D.
5. The method for detecting the airtightness of the soft package battery according to claim 4, is characterized in that: the gas pressure in the working cavity acts on the surface of the battery to be tested when changing, the gas enters the battery to be tested through the leakage port of the battery to be tested, the aluminum-plastic film wrapped on the surface of the battery to be tested is separated from the battery to be tested, and the aluminum-plastic film bulges relative to the surface of the battery to be tested.
6. The method for detecting the air tightness of the soft package battery according to claim 5, characterized in that: and f, detecting by using a plurality of groups of batteries without leakage, establishing a standard model, selecting the maximum difference value in the height change of the batteries as a reference, and setting a proper value as a leakage judgment standard.
7. The method for detecting the airtightness of the soft package battery according to claim 6, is characterized in that: the detection method mainly uses non-contact measurement to measure the surface displacement change of the soft package battery.
8. The method for detecting the airtightness of the soft package battery according to claim 7, is characterized in that: the numerical value of the non-contact measurement adopts data comparison, and the same position point measurement is adopted before and after the data comparison.
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Cited By (7)
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| CN111735707A (en) * | 2020-06-29 | 2020-10-02 | 天津市捷威动力工业有限公司 | Method and device for testing packaging strength of lithium ion soft package battery |
| CN111795784A (en) * | 2020-07-08 | 2020-10-20 | 苏州华智诚精工科技有限公司 | Helium detection process for detecting battery leakage |
| CN111982413A (en) * | 2020-07-29 | 2020-11-24 | 无锡格林司通自动化设备股份有限公司 | Soft package lithium battery leakage detection method |
| CN113074878A (en) * | 2021-05-20 | 2021-07-06 | 张家港清研检测技术有限公司 | Air tightness detection method for automobile battery |
| CN113138057A (en) * | 2021-03-15 | 2021-07-20 | 万向一二三股份公司 | Soft package battery leakage detection method and system |
| CN113295352A (en) * | 2021-07-13 | 2021-08-24 | 苏州华智诚精工科技有限公司 | Battery leakproofness check out test set |
| CN113804373A (en) * | 2020-06-12 | 2021-12-17 | 郑州宇通客车股份有限公司 | Battery pack air tightness detection method |
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| CN113295352A (en) * | 2021-07-13 | 2021-08-24 | 苏州华智诚精工科技有限公司 | Battery leakproofness check out test set |
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