CN108398219B - Lithium battery leakage test equipment and test method - Google Patents
Lithium battery leakage test equipment and test method Download PDFInfo
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- CN108398219B CN108398219B CN201810439432.0A CN201810439432A CN108398219B CN 108398219 B CN108398219 B CN 108398219B CN 201810439432 A CN201810439432 A CN 201810439432A CN 108398219 B CN108398219 B CN 108398219B
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- 238000012360 testing method Methods 0.000 title claims abstract description 123
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 71
- 238000010998 test method Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 88
- 238000007789 sealing Methods 0.000 claims abstract description 65
- 239000000523 sample Substances 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 239000011797 cavity material Substances 0.000 description 194
- 239000007789 gas Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 5
- 239000001307 helium Substances 0.000 description 5
- 229910052734 helium Inorganic materials 0.000 description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
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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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/34—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by testing the possibility of maintaining the vacuum in containers, e.g. in can-testing machines
-
- 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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses lithium battery leakage test equipment, which comprises a base body, a switch valve, a test sensor and a vacuumizing device, wherein the base body is provided with a sealing cavity and a detection cavity, the sealing cavity is communicated with the detection cavity or isolated from the detection cavity through the switch valve, and the output end of the vacuumizing device is respectively communicated with the sealing cavity and the detection cavity; the probe of the test sensor is arranged in the detection cavity. The lithium battery leakage test equipment has the advantages of high automation degree, high detection reliability and low cost. In addition, the invention also discloses a lithium battery leakage test method with high detection reliability and low cost.
Description
Technical Field
The invention relates to lithium battery detection equipment, in particular to lithium battery leakage test equipment and a lithium battery leakage test method.
Background
After the lithium battery is coiled, the finished battery is formed after a plurality of production procedures such as baking, liquid injection, vacuumizing, edge sealing, formation and the like. The quality of the finished battery relates to the safety of the battery, especially whether the battery is packaged reliably or not, and whether leakage exists or not relates to the safety of the battery, and once leakage occurs, the lithium battery electrolyte volatilizes, moisture permeates, swells, fires and explosions and the like, so that each battery needs to be subjected to leakage detection before leaving the factory.
At present, a bubble visual method, a pressure drop visual method, a differential pressure method, a vacuum box helium detection method and the like are commonly adopted in the leakage detection of the battery, and the existing detection methods are low in automation degree and low in reliability except the vacuum box helium detection method. While helium testing is highly reliable, it is complex in process, and requires the injection of helium into the finished battery, which is costly.
Disclosure of Invention
The invention aims to provide lithium battery leakage test equipment with high automation degree, high detection reliability and low cost.
The invention further aims to provide a lithium battery leakage test method with high detection reliability and low cost.
In order to achieve the above purpose, the lithium battery leakage test equipment provided by the invention comprises a base, a switch valve, a test sensor and a vacuumizing device, wherein the base is provided with a sealing cavity and a detection cavity, the sealing cavity and the detection cavity are communicated or isolated through the switch valve, and the output end of the vacuumizing device is respectively communicated with the sealing cavity and the detection cavity; the probe of the test sensor is arranged in the detection cavity.
Compared with the prior art, the lithium battery is placed in the sealing cavity by arranging the sealing cavity and the detecting cavity, the sealing cavity and the detecting cavity are isolated from each other by the switch valve, and the sealing cavity and the detecting cavity are vacuumized, so that if the lithium battery has leakage, the leaked gas is in the sealing cavity, and the gas in the sealing cavity enters the detecting cavity by opening the switch valve, so that the lithium battery can be tested by the test sensor; the detection cavity and the sealing cavity are mutually independent, and the detection cavity is not influenced by other factors, so that the detection can be accurately performed, and the detection reliability is extremely high; in addition, the whole detection process can automatically control the switch valve, the vacuumizing device and the test sensor, so that the automation degree is high; moreover, helium does not need to be injected, the detection process is simple, and the cost is low.
Preferably, the lithium battery leakage test apparatus further comprises a cleaning device for cleaning the test sensor. The cleaning device can clean the detection cavity after detection every time, ensures that the detection cavity is clean before the next test, cannot be affected by the last test, and effectively improves the detection accuracy.
Specifically, the cleaning device comprises an inlet, an outlet and a spraying device, wherein the inlet and the outlet are respectively communicated with the detection cavity, and the output end of the spraying device is communicated with the inlet.
Preferably, the base body comprises a lower cavity, an upper cavity and a detection cavity, the upper cavity is arranged above the lower cavity, the upper cavity and the lower cavity are combined to form the sealing cavity, and the detection cavity is fixed in the upper cavity and internally forms the detection cavity.
Specifically, the lithium battery leakage test equipment further comprises a lifting device and a rack, wherein the lifting device is fixed on the rack, and the output end can drive the upper cavity to move up and down relative to the lower cavity, so that the upper cavity and the lower cavity are opened or covered. Set up in elevating gear can make the upper chamber body can be automatic with lower cavity lid closes, save manual operation, degree of automation is high.
Specifically, lithium cell leakage test equipment still includes guide bar and lifter plate, the guide bar be vertical setting and with the frame is connected, the lifter plate pass through the uide bushing slidingly cup joint in the guide bar, the lifter plate is connected go up the cavity with elevating gear's output. Through the sliding guiding action of the guide rod and the lifting plate, the upper cavity can be accurately moved down to the lower cavity, and the accuracy and the tightness of the closing position of the upper cavity and the lower cavity are ensured.
Specifically, the lithium battery leakage test equipment further comprises a translation mechanism, wherein the lower cavity is arranged on the translation mechanism, and the translation mechanism can drive the lower cavity to translate to the lower side of the upper cavity. The translation mechanism can enable the lower cavity to move back and forth between the feeding position and the upper cavity covering position, so that automatic feeding is achieved, manual operation is omitted, and the degree of automation is high.
Specifically, the lithium battery leakage testing device further comprises a lower testing cavity, the lower testing cavity is arranged on the translation mechanism, and the translation mechanism can drive the lower testing cavity to translate to the lower part of the upper cavity. Through setting up cavity under the test, can be in the cavity material loading down carries out the no-load test in the time, improves the work effect of test to improve the accuracy of test.
Specifically, the translation mechanism comprises a driving device, a sliding rail and a sliding plate, wherein the sliding rail is horizontally arranged, the sliding plate is slidingly arranged on the sliding rail, and the lower cavity for testing are fixed on the sliding plate.
A lithium battery leakage test method comprises the following steps: providing a first sealing cavity and a detection cavity which are mutually independent, placing a lithium battery into the first sealing cavity, vacuumizing the first sealing cavity and the detection cavity, and maintaining the pressure for a certain time; after the pressure of the first sealing cavity is relieved, the first sealing cavity is communicated with the detection cavity; and testing the gas composition in the detection cavity by using a test sensor.
Preferably, the method further comprises the step of providing a second sealed cavity, and carrying out no-load testing by using the second sealed cavity, the detection cavity and the test sensor before testing the lithium battery.
Specifically, the no-load test includes the steps of: vacuumizing the second sealing cavity and the detection cavity; after the pressure of the second sealing cavity is relieved, the second sealing cavity is communicated with the detection cavity; and testing the gas composition in the detection cavity by using the test sensor.
In particular, the results of the lithium battery test are compared with the results of the no-load test.
Preferably, after testing the lithium battery, the detection chamber is depressurized and cleaned.
Drawings
Fig. 1 is a structural view of a lithium battery leakage test apparatus of the present invention.
Fig. 2 is a cross-sectional view of the lithium battery leakage test apparatus of the present invention.
Fig. 3 is a block diagram of an on-off valve and a test sensor in the lithium battery leakage test apparatus of the present invention.
Fig. 4 is a block diagram of a lower cavity, a test lower cavity and a translation mechanism in the lithium battery leakage test device of the present invention.
Fig. 5 is a flow chart of a lithium battery leakage test method of the present invention.
Detailed Description
In order to describe the technical content, the constructional features and the effects achieved by the present invention in detail, the following description is made with reference to the embodiments in conjunction with the accompanying drawings.
As shown in fig. 1 and 2, the lithium battery leakage test apparatus 100 of the present invention includes a base 1, a switch valve 2, a test sensor 3, and a vacuum pumping device (not shown); the base 1 is provided with a sealing cavity 1a and a detection cavity 1b, specifically, the base 1 comprises a lower cavity 11, an upper cavity 12 and a detection cavity 13, the upper cavity 12 is arranged above the lower cavity 11, the upper cavity 12 is combined with the lower cavity 11, a sealing ring 12a is arranged between the upper cavity 12 and the lower cavity 11 to form the sealing cavity 1a, the sealing ring 12a is fixed on one side of the upper cavity 12, and the detection cavity 13 is fixed on the upper cavity 12 and internally forms the detection cavity 1b. The sealing cavity 1a and the detecting cavity 1b are connected through the switch valve 2 to realize communication or isolation, specifically, the sealing cavity 1a and the detecting cavity 1b are communicated through an opening 1c, the switch valve 2 is arranged on the upper cavity 12, the switch end 21 is positioned in the detecting cavity 1b, when the switch valve 2 stretches out, the switch end 21 seals the opening 1c, and when the switch valve 2 contracts, the switch end 21 leaves the opening 1c to enable the sealing cavity 1a to be communicated with the detecting cavity 1b. The output end of the vacuumizing device is respectively communicated with the sealing cavity 1a and the detecting cavity 1b, the vacuumizing device can vacuumize the sealing cavity 1a and the detecting cavity 1b, and meanwhile clean gas can be introduced into the sealing cavity 1a and the detecting cavity 1b for decompression; the probe of the test sensor 3 is arranged in the detection cavity 1b.
Referring to fig. 2 and 3 again, the lithium battery leakage test apparatus 100 further includes a cleaning device 4, where the cleaning device 4 is used for cleaning the test sensor 3. The cleaning device 4 comprises an inlet 41, an outlet 42 and a spraying device, wherein the inlet 41 and the outlet 42 are respectively communicated with the detection cavity 1b, and the output end of the spraying device is communicated with the inlet 41. The cleaning device 4 can clean the detection cavity 1b after detection every time, so that the detection cavity 1b is clean before the next test, cannot be affected by the last test, and effectively improves the detection accuracy.
Referring to fig. 1 again, the lithium battery leakage testing apparatus 100 further includes a lifting device 5 and a frame 6, wherein the lifting device 5 is fixed on the frame 6, and an output end can drive the upper cavity 12 to move up and down relative to the lower cavity 11, so that the upper cavity 12 and the lower cavity 11 are opened or closed. The lifting device 5 is arranged, the upper cavity 12 can be automatically covered with the lower cavity 11, manual operation is omitted, and the degree of automation is high.
As shown in fig. 1, the lithium battery leakage test apparatus 100 further includes a guide rod 7 and a lifting plate 8, where the guide rod 7 is vertically disposed and connected to the frame 6, the lifting plate 8 is slidably sleeved on the guide rod 7 through a guide sleeve, and the lifting plate 8 is connected to the upper cavity 12 and the output end of the lifting device 5. Through the sliding guiding action of the guide rod 7 and the lifting plate 8, the upper cavity 12 can be accurately moved onto the lower cavity 11, and the accuracy and the tightness of the covering position of the upper cavity and the lower cavity are ensured.
As shown in fig. 1 and 4, the lithium battery leakage testing apparatus 100 further includes a translation mechanism 9, the lower cavity 11 is disposed on the translation mechanism 9, and the translation mechanism 9 can drive the lower cavity 11 to translate to a position below the upper cavity 12. The translation mechanism 9 comprises a driving device, a sliding rail 91 and a sliding plate 92, wherein the sliding rail 91 is horizontally arranged, the sliding plate 92 is slidingly arranged on the sliding rail 91, and the lower cavity 11 is fixed on the sliding plate 92. The translation mechanism 9 can enable the lower cavity 11 to move back and forth between the feeding position and the covering position of the upper cavity 12, so that automatic feeding is realized, manual operation is omitted, and the degree of automation is high. The lithium battery leakage test device 100 further comprises a lower test cavity 10, the lower test cavity 10 is arranged on the slide plate 92 and is parallel to the lower cavity 11, and the translation mechanism 9 can drive the lower test cavity 10 to translate to the lower side of the upper cavity 12 at the same time when driving the lower cavity 11 to translate away from the lower side of the upper cavity 12, and the lower test cavity 10 and the upper cavity 12 can be covered to form a test seal cavity 1d for early test. By arranging the lower testing cavity 10, no-load testing can be performed while the lower cavity 11 is loaded, the working effect of testing is improved, and the testing accuracy is improved.
In summary, and with reference to fig. 4, the operation of the lithium battery leakage test apparatus 100 of the present invention is described in detail as follows:
and the translation mechanism 9 drives the lower cavity 11 to move out for the purpose of enabling the lower cavity 11 to be located in a feeding area, the lower cavity 10 for testing is opposite to the upper cavity 12, and a lithium battery to be tested is placed in the lower cavity 11 at the moment. At the same time, the lifting device 5 drives the upper cavity 12 to move downwards, so that the upper cavity 12 and the lower test cavity 10 are hermetically covered together to form the second sealed cavity 1a. Then, vacuumizing the second sealing cavity 1a and the detection cavity 1b through a vacuumizing device, and maintaining the pressure for a certain time; after the dwell time is up, filling clean gas into the second sealing cavity 1a for pressure relief, after the pressure relief is completed, starting the switch valve 2 to open, so that the second sealing cavity 1a is communicated with the detection cavity 1b, the gas in the second sealing cavity 1a enters the detection cavity 1b, and after the gas pressures of the second sealing cavity 1a and the detection cavity 1b are balanced, testing the gas components in the detection cavity 1b by using the test sensor 3 to obtain a first test result.
When the lithium battery leakage test is performed, the translation mechanism 9 drives the lower cavity 11 with the lithium battery to move below the upper cavity 12 and to be opposite to the upper cavity 12. The lifting device 5 drives the upper cavity 12 to move downwards, so that the upper cavity 12 and the lower cavity 11 are hermetically covered together to form the first sealed cavity 1a. Then, vacuumizing the first sealing cavity 1a and the detection cavity 1b through a vacuumizing device, and maintaining the pressure for a certain time; in the pressure maintaining process, if the lithium battery leaks, the gas in the lithium battery leaks under the negative pressure of the first sealing cavity 1a, and the gas comprises the components of the electrolyte of the lithium battery, otherwise, if the lithium battery does not leak, the first sealing cavity 1a is kept clean and the components of the electrolyte do not exist; after the dwell time is up, filling clean gas into the first seal cavity 1a for pressure relief, after the pressure relief is completed, starting the switch valve 2 to open, so that the first seal cavity 1a is communicated with the detection cavity 1b, the gas in the first seal cavity 1a enters the detection cavity 1b, and after the gas pressures of the first seal cavity 1a and the detection cavity 1b are balanced, testing the gas components in the detection cavity 1b by using the test sensor 3 to obtain a second test result. If the lithium battery has leakage, the second test result comprises electrolyte components, and the leakage of the lithium battery can be judged after the second test result is compared with the first test structure which does not comprise the electrolyte components; otherwise, the lithium battery has no leakage.
As shown in fig. 5, a lithium battery leakage test method includes the following steps:
s1, providing a first sealing cavity, a detection cavity and a second sealing cavity which are mutually independent;
s2, vacuumizing the second sealing cavity and the detection cavity, and maintaining the pressure for a certain time;
s3, after the pressure of the second sealing cavity is relieved, the second sealing cavity is communicated with the detection cavity;
s4, testing the gas components in the detection cavity by using the test sensor to obtain a first test result.
S5, placing the lithium battery into the first sealing cavity, vacuumizing the first sealing cavity and the detection cavity, and maintaining the pressure for a certain time;
s6, after the pressure of the first sealing cavity is relieved, the first sealing cavity is communicated with the detection cavity;
s7, testing the gas components in the detection cavity by using a test sensor to obtain a second test result.
S8, comparing a second test result of the lithium battery test with a first test result of the no-load test; the comparative components are the same, so that the lithium battery does not leak, otherwise, the lithium battery leaks.
And S9, after testing the lithium battery, decompressing and cleaning the detection cavity.
The foregoing disclosure is merely illustrative of the principles of the present invention, and thus, it is intended that the scope of the invention be limited thereto and not by this disclosure, but by the claims appended hereto.
Claims (9)
1. A lithium battery leakage test device is characterized in that: the vacuum test device comprises a seat body, a switch valve, a test sensor and a vacuum pumping device, wherein the seat body is provided with a sealing cavity and a detection cavity, the sealing cavity is communicated with the detection cavity or isolated from the detection cavity through the switch valve, and the output end of the vacuum pumping device is respectively communicated with the sealing cavity and the detection cavity; the probe of the test sensor is arranged in the detection cavity; the base body comprises a lower cavity, an upper cavity and a detection cavity, the upper cavity is arranged above the lower cavity, the upper cavity and the lower cavity are combined to form the sealing cavity, and the detection cavity is fixed in the upper cavity and internally forms the detection cavity; the lithium battery leakage testing equipment further comprises a translation mechanism and a lower testing cavity, the lower testing cavity and the lower testing cavity are arranged on the translation mechanism side by side, and the translation mechanism can drive the lower testing cavity to translate to the lower part of the upper cavity simultaneously when driving the lower testing cavity to translate away from the lower part of the upper cavity, and the lower testing cavity and the upper cavity can be covered to form a testing sealing cavity.
2. The lithium battery leakage test apparatus according to claim 1, wherein: the lithium battery leakage test equipment further comprises a cleaning device, wherein the cleaning device is used for cleaning the test sensor.
3. The lithium battery leakage test apparatus according to claim 2, wherein: the cleaning device comprises an inlet, an outlet and a spraying device, wherein the inlet and the outlet are respectively communicated with the detection cavity, and the output end of the spraying device is communicated with the inlet.
4. The lithium battery leakage test apparatus according to claim 1, wherein: the lithium battery leakage testing equipment further comprises a lifting device and a rack, wherein the lifting device is fixed on the rack, and the output end can drive the upper cavity to move up and down relative to the lower cavity, so that the upper cavity and the lower cavity are opened or covered.
5. The lithium battery leakage test apparatus according to claim 4, wherein: the lithium battery leakage testing equipment further comprises a guide rod and a lifting plate, wherein the guide rod is vertically arranged and connected with the frame, the lifting plate is sleeved on the guide rod in a sliding mode through a guide sleeve, and the lifting plate is connected with the upper cavity and the output end of the lifting device.
6. The lithium battery leakage test apparatus according to claim 1, wherein: the translation mechanism comprises a driving device, a sliding rail and a sliding plate, wherein the sliding rail is horizontally arranged, the sliding plate is slidingly arranged on the sliding rail, and the lower cavity for testing are fixed on the sliding plate.
7. A lithium battery leakage test method characterized by performing a test using the lithium battery leakage test apparatus according to any one of claims 1 to 6, comprising the steps of:
providing a first sealing cavity, a detection cavity and a second sealing cavity which are mutually independent, and carrying out no-load test by using the second sealing cavity, the detection cavity and the sensor;
placing a lithium battery into the first sealing cavity, vacuumizing the first sealing cavity and the detection cavity, and maintaining the pressure for a certain time;
after the pressure of the first sealing cavity is relieved, the first sealing cavity is communicated with the detection cavity;
testing the gas composition in the detection cavity by using a sensor;
the results of the lithium battery test are compared with the results of the no-load test.
8. The lithium battery leakage test method according to claim 7, wherein: the no-load test comprises the following steps:
vacuumizing the second sealing cavity and the detection cavity;
after the pressure of the second sealing cavity is relieved, the second sealing cavity is communicated with the detection cavity;
the sensor is used for testing the gas composition in the detection cavity.
9. The lithium battery leakage test method according to claim 7, wherein: after testing the lithium battery, the detection cavity is decompressed and cleaned.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810439432.0A CN108398219B (en) | 2018-05-09 | 2018-05-09 | Lithium battery leakage test equipment and test method |
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| CN201810439432.0A CN108398219B (en) | 2018-05-09 | 2018-05-09 | Lithium battery leakage test equipment and test method |
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| CN111024337A (en) * | 2018-10-09 | 2020-04-17 | 郑州宇通重工有限公司 | High-voltage electrical junction box air tightness detection device and detection method thereof |
| CN110132988B (en) * | 2019-06-12 | 2024-07-05 | 广东省智能机器人研究院 | Electrolyte leakage detection equipment for power battery |
| CN111346840A (en) * | 2020-03-16 | 2020-06-30 | 广东丰盛产学研智能科技研究院有限公司 | Ceramic electric core leak detector |
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