CN107806969A - A kind of secondary cell leak hunting method - Google Patents
A kind of secondary cell leak hunting method Download PDFInfo
- Publication number
- CN107806969A CN107806969A CN201710861146.9A CN201710861146A CN107806969A CN 107806969 A CN107806969 A CN 107806969A CN 201710861146 A CN201710861146 A CN 201710861146A CN 107806969 A CN107806969 A CN 107806969A
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- Prior art keywords
- battery
- gas
- secondary cell
- leak hunting
- hunting method
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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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4228—Leak testing of cells or batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention provides a kind of secondary cell leak hunting method, comprises the following steps：Step 1, search gas is dissolved in electrolyte by high-pressure process, then the electrolyte is injected in battery and completes the encapsulation of battery；Step 2, the battery obtained by step 1 is placed in the closed container for being provided with leakage detecting instrument, to container vacuum-pumping and pressurize, is re-filled with gas, so circulation；Step 3, leakage detecting instrument is opened, the gas extracted out in closed container is checked, according to whether detecting that search gas judges that battery whether there is leakage.Compared to prior art, the present invention can be in the case where not destroying battery packages outward appearance, the battery that the defects of pin hole, unencapsulated, leakage encapsulates, be damaged be present conveniently and efficiently is screened out, in order to avoid the bad battery that leakage risk be present flows out to client, causes potential safety hazard.
Description
Technical field
The invention belongs to cell art, more particularly to a kind of secondary cell leak hunting method.
Background technology
During secondary cell manufactures, it is understood that there may be situations below can cause battery that leakage occurs：1) battery circulates
Protect the defects of weekly assembly does not cause damaged battery surface, pin hole；2) because equipment and human factor cause cell package incomplete,
Situations such as being sealed in the presence of leakage, be unencapsulated；3) because technological problemses cause battery leakage passage to be present.It should be noted that electrolyte
On the one hand leakage can cause battery performance to decline；On the other hand terminal can be caused to corrode, and defect passage can cause potential safety hazard,
Such as LiPF6Electrolyte causes battery that flatulence occurs after absorbing moisture by defect passage.
Influence is brought to battery performance and security performance in order to avoid electrolyte is revealed, generally all can be to battery
Hunted leak.In the prior art, patent CN200620055023, CN20071012544 and CN201610765521 is used
The battery leak hunting method of vacuum pressure method, the method have the characteristics of simple to operate, equipment price is low, but the method detection efficiency
It is low, and irreversible influence can be caused on battery surface and outward appearance.Patent CN20122029318 provides a kind of weight method side of leaking hunting
Method, but the method can leave print stain in hot and humid lower leak detection in battery surface, influence outward appearance.Patent CN201510152175 is provided
A kind of negative pressure/weight-loss method leak hunting method, the method need preferable sealing and are adapted to single battery leak detection, Sensitivity compared with
It is low.Patent CN201520158858 provides a kind of positive/negative-pressure leak hunting method, be adapted to the leak detection of batch battery, is adapted to leakage serious
Battery is low to the battery detector efficiency of fine defects.In addition, helium inspection method, such as patent were have also appeared in recent years
CN201320619362 and CN201710125397, the method has the characteristics of recall rate is high, but the method will to equipment and environment
Ask high, expensive, detector efficiency is low.
Therefore, it is necessary to a kind of new battery leak hunting method is designed to solve problems of the prior art.
The content of the invention
It is an object of the invention to：In view of the shortcomings of the prior art, a kind of secondary cell leak hunting method, this method are provided
It can conveniently be screened out pin hole, unencapsulated, leakage encapsulation, breakage being present in the case where not destroying battery packages outward appearance
The defects of battery, in order to avoid the bad battery that leakage risk be present flows out to client, cause potential safety hazard.
To achieve these goals, the present invention uses following technical scheme：
A kind of secondary cell leak hunting method, comprises the following steps：
Step 1, search gas is dissolved in electrolyte by high-pressure process, then injected the electrolyte in battery simultaneously
Complete the encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in the closed container for being provided with leakage detecting instrument, to container vacuum-pumping
And pressurize, gas is re-filled with, so circulation；
Step 3, leakage detecting instrument is opened, the gas extracted out in closed container is checked, according to whether detecting that search gas is sentenced
Power-off pond whether there is leakage.
When defect occurs in battery, by vacuumizing-the circulate operation of pressurize-inflation so that battery is inside and outside to form pressure difference,
So as to force electrolyte of the inside battery dissolved with helium or halogen elementary gas to overflow；Leakage detecting instrument is according to whether detect helium
Gas or halogen elementary gas judge that battery whether there is leakage.The high sensitivity of the present invention, recall rate is high, the time is short, easy to operate
And cost is relatively low, it is adapted to the screening of high-volume battery.
Battery leak hunting method of the present invention is applied to the secondary cells such as lithium ion, potassium ion and sodium ion, likewise,
The leak hunting method of the present invention is applied to flexible-packed battery, box hat battery and rectangular cell.
One kind as secondary cell leak hunting method of the present invention is improved, and the search gas is to contain 5%-30%
The mixed gas of helium or halogen elementary gas.Wherein, the mixed gas containing 5%-30% helium or halogen elementary gas is
As long as only can be any containing 5%-30% helium or 5%-30% halogen elementary gas, other components in the mixed gas
Selection, as long as not influenceing electrolyte property, what is generally selected is the inert gases such as nitrogen and/or argon gas.
One kind as secondary cell leak hunting method of the present invention is improved, when the search gas contains helium,
The leakage detecting instrument is helium mass spectrometer.The accuracy of detection of helium mass spectrometer is up to 10-10Pa·m3/s。
One kind as secondary cell leak hunting method of the present invention is improved, when the search gas contains halogen simple substance
During gas, the leakage detecting instrument is halogen mass spectrograph.The mass spectrometric accuracy of detection of halogen is up to 3.2 × l0-9Pam3/s。
As secondary cell leak hunting method of the present invention one kind improve, in step 2, it is described vacuumize it is true
Reciprocal of duty cycle is -20~-120KPa.Overflow, take seriously at the defects of purpose vacuumized is inside battery electrolyte passing through pin hole
(it is less than -20Kpa) when reciprocal of duty cycle is too small, electrolyte is not easy to overflow；(exceed -120Kpa) when vacuum is excessive, inside and outside battery
Pressure difference is excessive, and battery easily deforms.
One kind as secondary cell leak hunting method of the present invention is improved, in step 2, the time of the pressurize
For 1~120s.When the dwell time is too short, electrolyte has little time to overflow；And when the dwell time is long, battery can be caused to become
Shape.
One kind as secondary cell leak hunting method of the present invention is improved, in step 2, the time of the pressurize
For 40~80s.
One kind as secondary cell leak hunting method of the present invention is improved, and in step 2, the gas being filled with is sky
Any one or more mixing in gas, nitrogen and argon gas.
One kind as secondary cell leak hunting method of the present invention is improved, and in step 2, the number of circulation is at least
For 2 times.In the case where pressure setting is rationally appropriate, cycle-index is The more the better, because the spill-out of electrolyte is more, more holds
Easily it is detected.Certainly, cycle-index is also unsuitable excessive, and equipment attrition on the one hand can be caused excessive, such as true for vacuumizing
Empty pump；On the other hand the operating time of whole step 2 can be lengthened, efficiency can be influenceed.
The beneficial effects of the present invention are：The present invention provides a kind of secondary cell leak hunting method, comprises the following steps：Step
One, search gas is dissolved in electrolyte by high-pressure process, then the electrolyte is injected in battery and completes the envelope of battery
Dress；Step 2, the battery obtained by step 1 is placed in the closed container for being provided with leakage detecting instrument, to container vacuum-pumping and protected
Pressure, is re-filled with gas, so circulation；Step 3, leakage detecting instrument is opened, check the gas extracted out in closed container, according to whether
Detect that search gas judges that battery whether there is leakage.Compared to prior art, the present invention can not destroy battery packages
In the case of outward appearance, the battery that the defects of pin hole, unencapsulated, leakage encapsulates, be damaged be present conveniently and efficiently is screened out, in order to avoid in the presence of
The bad battery of leakage risk flows out to client, causes potential safety hazard.
Embodiment
The present invention and its advantage are described in further detail below in conjunction with embodiment, still, this hair
Bright embodiment is not limited thereto.
Embodiment 1
The present embodiment provides a kind of battery leak hunting method, comprises the following steps：
Step 1, the mixed gas containing 5% helium is dissolved in electrolyte by high-pressure process, is then electrolysed this
Liquid injects in battery and completes the encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in the closed container for being provided with helium mass spectrometer, container taken out very
Empty to vacuum be -20Kpa, and pressurize 120s is re-filled with air, so circulated 2 times；
Step 3, helium mass spectrometer is opened, check the gas extracted out in closed container, according to whether detecting that helium judges
Battery whether there is leakage.
Embodiment 2
The present embodiment provides a kind of battery leak hunting method, comprises the following steps：
Step 1, the mixed gas containing 10% halogen elementary gas is dissolved in electrolyte by high-pressure process, so
The electrolyte is injected in battery afterwards and completes the encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in and is provided with the mass spectrometric closed container of halogen, container is taken out very
Empty to vacuum be -40Kpa, and pressurize 100s is re-filled with nitrogen, so circulated 2 times；
Step 3, halogen mass spectrograph is opened, the gas extracted out in closed container is checked, according to whether detecting halogen simple substance
Gas judges that battery whether there is leakage.
Embodiment 3
The present embodiment provides a kind of battery leak hunting method, comprises the following steps：
Step 1, the mixed gas containing 15% halogen elementary gas is dissolved in electrolyte by high-pressure process, then
The electrolyte is injected in battery and completes the encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in and is provided with the mass spectrometric closed container of halogen, container is taken out very
Empty to vacuum be -60Kpa, and pressurize 80s is re-filled with argon gas, so circulated 3 times；
Step 3, halogen mass spectrograph is opened, the gas extracted out in closed container is checked, according to whether detecting halogen simple substance
Gas judges that battery whether there is leakage.
Embodiment 4
The present embodiment provides a kind of battery leak hunting method, comprises the following steps：
Step 1, the mixed gas containing 20% helium is dissolved in electrolyte by high-pressure process, then by the electricity
Solution liquid injects in battery and completes the encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in the closed container for being provided with helium mass spectrometer, container taken out very
Empty to vacuum be -80Kpa, and pressurize 60s is re-filled with air and argon gas, so circulated 3 times；
Step 3, helium mass spectrometer is opened, check the gas extracted out in closed container, according to whether detecting that helium judges
Battery whether there is leakage.
Embodiment 5
The present embodiment provides a kind of battery leak hunting method, comprises the following steps：
Step 1, the mixed gas containing 25% halogen elementary gas is dissolved in electrolyte by high-pressure process, so
The electrolyte is injected in battery afterwards and completes the encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in and is provided with the mass spectrometric closed container of halogen, container is taken out very
Empty to vacuum be -100Kpa, and pressurize 40s is re-filled with nitrogen and argon gas, so circulated 4 times；
Step 3, halogen mass spectrograph is opened, the gas extracted out in closed container is checked, according to whether detecting halogen simple substance
Gas judges that battery whether there is leakage.
Embodiment 6
The present embodiment provides a kind of battery leak hunting method, comprises the following steps：
Step 1, the mixed gas containing 30% helium is dissolved in electrolyte by high-pressure process, then by the electricity
Solution liquid injects in battery and completes the encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in the closed container for being provided with helium mass spectrometer, container taken out very
Empty to vacuum be -120Kpa, and pressurize 20s is re-filled with air, nitrogen and argon gas, so circulated 4 times；
Step 3, helium mass spectrometer is opened, check the gas extracted out in closed container, according to whether detecting that helium judges
Battery whether there is leakage.
The testing result of embodiment 1~6 is shown in Table 1.
The testing result of table 1
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in above-mentioned embodiment, every those skilled in the art exist
Made any conspicuously improved, replacement or modification belong to protection scope of the present invention on the basis of the present invention.This
Outside, although having used some specific terms in this specification, these terms merely for convenience of description, not to the present invention
Form any restrictions.
Claims (9)
1. a kind of secondary cell leak hunting method, it is characterised in that comprise the following steps：
Step 1, search gas is dissolved in electrolyte by high-pressure process, then the electrolyte is injected in battery and completed
The encapsulation of battery；
Step 2, the battery obtained by step 1 is placed in the closed container for being provided with leakage detecting instrument, to container vacuum-pumping and protected
Pressure, is re-filled with gas, so circulation；
Step 3, leakage detecting instrument is opened, check the gas extracted out in closed container, according to whether detecting that search gas body judges
Battery whether there is leakage.
2. secondary cell leak hunting method according to claim 1, it is characterised in that：The search gas is to contain 5%-
The mixed gas of 30% helium or halogen elementary gas.
3. secondary cell leak hunting method according to claim 1, it is characterised in that：When the search gas contains helium
When, the leakage detecting instrument is helium mass spectrometer.
4. secondary cell leak hunting method according to claim 1, it is characterised in that：When the search gas contains halogen list
During matter gas, the leakage detecting instrument is halogen mass spectrograph.
5. secondary cell leak hunting method according to claim 1, it is characterised in that：It is described to vacuumize in step 2
Vacuum is -20~-120KPa.
6. secondary cell leak hunting method according to claim 1, it is characterised in that：In step 2, the pressurize when
Between be 1~120s.
7. secondary cell leak hunting method according to claim 6, it is characterised in that：In step 2, the pressurize when
Between be 40~80s.
8. secondary cell leak hunting method according to claim 1, it is characterised in that：In step 2, the gas being filled with is
Any one or more mixing in air, nitrogen and argon gas.
9. secondary cell leak hunting method according to claim 1, it is characterised in that：In step 2, the number of circulation is extremely
It is 2 times less.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710861146.9A CN107806969A (en) | 2017-09-21 | 2017-09-21 | A kind of secondary cell leak hunting method |
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| CN201710861146.9A CN107806969A (en) | 2017-09-21 | 2017-09-21 | A kind of secondary cell leak hunting method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057506A (en) * | 2019-04-30 | 2019-07-26 | 蜂巢能源科技有限公司 | Test the method for battery sealing-performance and the method for test battery quality |
| CN111912568A (en) * | 2020-06-22 | 2020-11-10 | 无锡格林司通自动化设备股份有限公司 | Method for detecting leakage of lithium battery electrolyte |
| CN117168711A (en) * | 2023-11-03 | 2023-12-05 | 宁德时代新能源科技股份有限公司 | Detection device, detection method for detection device, computer device, and storage medium |
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| CN117168711B (en) * | 2023-11-03 | 2024-04-02 | 宁德时代新能源科技股份有限公司 | Detection device, detection method for detection device, computer device, and storage medium |
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