CN107870069A - A kind of secondary cell method for conducting leak test - Google Patents
A kind of secondary cell method for conducting leak test Download PDFInfo
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- CN107870069A CN107870069A CN201710859749.5A CN201710859749A CN107870069A CN 107870069 A CN107870069 A CN 107870069A CN 201710859749 A CN201710859749 A CN 201710859749A CN 107870069 A CN107870069 A CN 107870069A
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- Prior art keywords
- battery core
- indicator
- secondary cell
- leak test
- cell 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
Abstract
The present invention provides a kind of secondary cell method for conducting leak test, comprises the following steps：Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping and pressurize, be re-filled with gas, so circulation；Step 2, after circulation terminates, the high humidity gas with indicator is filled with into closed container；Step 3, closed container is heated and is incubated；Step 4, terminate to heat and take out battery core, observation battery core surface, if battery core surface has colour developing point or color development area, judges that the battery core has leakage with the presence or absence of colour developing point or color development area.Compared to prior art, the present invention can be in the case where not destroying battery core packaging external appearance, the battery core 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 core that leakage risk be present flows out to client, causes potential safety hazard.
Description
Technical field
The invention belongs to technical field of lithium ion, more particularly to a kind of secondary cell method for conducting leak test.
Background technology
During secondary cell manufactures, it is understood that there may be situations below can cause battery core poor sealing：1) battery core stream
Rotation protection the defects of weekly assembly does not cause battery core surface fracture, pin hole；2) because equipment and human factor cause battery core encapsulation endless
Entirely, situations such as leakage envelope, unencapsulated be present；3) because technological problemses cause battery core leakage passage to be present.It should be noted that when electricity
Electrolyte leakage is greatly may result in during core poor sealing, and on the one hand electrolyte leakage can cause battery core hydraulic performance decline；
On the other hand terminal can be caused to corrode, and defect passage can cause potential safety hazard, such as LiPF6Electrolyte is absorbed by defect passage
Cause battery that flatulence occurs after moisture.
Influence is brought to battery core chemical property and security performance in order to avoid electrolyte is revealed, generally all can be to battery core
Sealing detected.In the prior art, patent CN200620055023, CN20071012544 and
CN201610765521 employs the battery core leak hunting method of vacuum pressure method, and the method has that simple to operate, equipment price is low
Feature, but the method detection efficiency is low, and irreversible influence can be caused on battery core surface and outward appearance.Patent CN20122029318
A kind of weight method leak detection method is provided, but the method can leave print stain in hot and humid lower leak detection on battery core surface, influence outward appearance.Specially
Sharp CN201510152175 provides a kind of negative pressure/weight-loss method leak hunting method, and the method needs preferable sealing and is adapted to single electricity
Core is hunted leak, and Sensitivity is relatively low.Patent CN201520158858 provides a kind of positive/negative-pressure leak hunting method, is adapted to batch battery core
Leak detection, it is adapted to the serious battery core of leakage, it is low to the battery core detector efficiency of fine defects.In addition, helium inspection method was have also appeared in recent years,
Such as patent CN201320619362 and CN201710125397, the method has the characteristics of recall rate is high, but the method to equipment and
Environmental requirement is high, and expensive, detector efficiency is low.
Therefore, it is necessary to a kind of new secondary cell method for conducting leak test is designed to solve to ask present in prior art
Topic.
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 method for conducting leak test is provided,
This method can conveniently be screened out pin hole, unencapsulated, leakage envelope being present in the case where not destroying battery core packaging external appearance
The battery core for the defects of filling, be damaged, in order to avoid the bad battery core that leakage risk be present flows out to client, causes potential safety hazard.
To achieve these goals, the present invention uses following technical scheme：
A kind of secondary cell method for conducting leak test, comprises the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping and pressurize, be re-filled with gas, such as
This circulation；
Step 2, after circulation terminates, the high humidity gas with indicator is filled with into closed container；
Step 3, closed container is heated and is incubated；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if electric
There is colour developing point or color development area in wicking surface, then judge that the battery core has leakage；
The indicator does not corrode lug and encapsulating material, the ion concentration that the molecular concentration of the indicator or ionization go out
Change with pH value and change, and the indicator changes with pH value under acid or weakly acidic condition and different colors is presented.
The selection of indicator there may be following two situations：One kind is that indicator itself is colourless, and under sour environment
It can develop the color；Another is that indicator itself has color, and colourless under weakly alkaline environment, now first will under alkaline environment
Indicator debugging meets acid-base neutralization after acid into colourless solution, the solution, and indicator returns to the color of itself.Why select certainly
The colourless indicator of body first debugs indicator into colourless solution in alkaline environment, is to prevent with coloured solution
Destroy battery core outward appearance.
It should be noted that when defect occurs in battery core, by vacuumizing-the circulation of pressurize-inflation, positive and negative pressure forces
Battery core electrolyte inside is overflowed；The electrolyte of spilling reacts under hot and humid environment with water generates HF, and acidity is presented in HF,
With the indicator reaction in high humidity gas, go out colour developing in leakage, and other non-leakage positions or battery core are not in then colour developing,
That is battery core outward appearance will not be influenceed in the battery core surface staining of non-leakage.In addition, this method be simple and convenient to operate, into
This low and efficiency high, you can a small amount of battery core is accurately detected, is adapted to the detection of high-volume battery core again, it is auxiliary without high precision apparatus
Help, it is easy to accomplish.
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 method for conducting leak test of the present invention is improved, described to take out very in step 1
Empty vacuum is -20~-120KPa.The purpose vacuumized is to extrude the defects of battery core electrolyte inside is passed through into pin hole,
(it is less than -20Kpa) when vacuum is too small, electrolyte is not easy to extrude；(exceed -120Kpa) when vacuum is excessive, battery core
Inside and outside differential pressure is excessive, and battery core easily deforms.
One kind as secondary cell method for conducting leak test of the present invention is improved, in step 1, the pressurize
1~120s of time.When the dwell time is too short, electrolyte has little time to be extruded；And when the dwell time is long, electricity can be caused
Core deforms.Preferably, the time of the pressurize is 40~80s.
One kind as secondary cell method for conducting leak test of the present invention is improved, in step 1, the circulation
Number be at least 2 times.In the case where pressure setting is rationally appropriate, cycle-index is The more the better, because the extrusion of electrolyte
Amount is more, is more easily detected.Certainly, cycle-index is also unsuitable excessive, and equipment attrition on the one hand can be caused excessive, be such as used for
The vavuum pump vacuumized；On the other hand the operating time of whole step 2 can be lengthened, efficiency can be influenceed.
One kind as secondary cell method for conducting leak test of the present invention is improved, in step 1, the gas that is filled with
Body is any one or more mixing in air, nitrogen and argon gas.
One kind as secondary cell method for conducting leak test of the present invention is improved, described to carry in step 2
The high humidity gas of indicator is the atomization gas dissolved with the aqueous solution of 1wt%~80wt% indicator, or for dissolved with 1%wt
The atomization gas of the organic solution of~80%wt indicator and the mixed solution of water.Wherein, " dissolved with 1wt%~80wt%'s
The atomization gas of the aqueous solution of indicator " refers to that the indicator can be dissolved in water, therefore it directly is formed into mixed liquor with the aqueous solution
Body is become atomization gas again.However, some indicator are not dissolved in the aqueous solution but are dissolved in organic solution, therefore, " dissolved with
The atomization gas of the organic solution of 1wt%~80wt% indicator and the mixed solution of water " refers to indicator being dissolved in organic
In solution, then itself and water be mixed to form mixed solution, mixed solution is finally become into atomization gas again.
One kind as secondary cell method for conducting leak test of the present invention is improved, in step 2, the high humidity
The humidity of gas is 30%~90%.Humidity environment is to allow the electrolyte of spilling to touch water, and then reaction generation
HF, colour developing test can be carried out.When humidity is too low, even if electrolyte overflows, also it is not easy reaction and produces enough HF, it is unsuitable
It is detected；When humidity is excessive, although can ensure electrolyte colour developing and be detected, excessive humidity can pass through plastic-aluminum
Film penetrates into and flatulence is caused inside battery core, and is easily formed in battery core outer surface water stain.
One kind as secondary cell method for conducting leak test of the present invention is improved, in step 3, the heating
Heated for the bottom-heated to closed container or to the surrounding of closed container.
One kind as secondary cell method for conducting leak test of the present invention is improved, in step 3, the heating
Temperature be 40~90 DEG C.The decomposition temperature of electrolyte is about more than 85 DEG C, when temperature is too high, easily causes electrolyte point
Solution, and higher temperature can also cause diaphragm retracts, in turn result in battery core internal short-circuit.
One kind as secondary cell method for conducting leak test of the present invention is improved, in step 3, the insulation
Time be 0.1~3h.
The beneficial effects of the present invention are：The present invention provides a kind of secondary cell method for conducting leak test, including following step
Suddenly：Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping and pressurize, be re-filled with gas, so follow
Ring；Step 2, after circulation terminates, the high humidity gas with indicator is filled with into closed container；Step 3, closed container is entered
Row is heated and is incubated；Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or colour developing area
Domain, if battery core surface has colour developing point or color development area, judge that the battery core has leakage；The indicator do not corrode lug and
The ion concentration that encapsulating material, the molecular concentration of the indicator or ionization go out changes and changed with pH value, and the indicator
Change under acid or weakly acidic condition with pH value and different colors is presented.Compared to prior art, the present invention can not broken
In the case of bad battery core packaging external appearance, the electricity that the defects of pin hole, unencapsulated, leakage encapsulates, be damaged be present conveniently and efficiently is screened out
Core, in order to avoid the bad battery core that leakage risk be present flows out to client, cause 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 secondary cell method for conducting leak test, comprises the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping to -20Kpa and pressurize 120s, then
Air is filled with, so circulation 2 times；
Step 2, after circulation terminates, the instruction dissolved with 1wt%~80wt% that humidity is 30% is filled with into closed container
The atomization gas of the aqueous solution of agent；
Step 3, the bottom of closed container is heated, heating-up temperature is 40 DEG C, and is incubated 3h；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if electric
There is colour developing point or color development area in wicking surface, then judge that the battery core has leakage；
Indicator does not corrode lug and encapsulating material, and the ion concentration that the molecular concentration of indicator or ionization go out becomes with pH value
Change and change, and indicator changes with pH value under acid or weakly acidic condition and different colors is presented.Indicator itself is colourless,
And it can be developed the color under sour environment.
Embodiment 2
The present embodiment provides a kind of secondary cell method for conducting leak test, comprises the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping to -40Kpa and pressurize 100s, then
Nitrogen is filled with, so circulation 2 times；
Step 2, after circulation terminates, the instruction dissolved with 1wt%~80wt% that humidity is 40% is filled with into closed container
The atomization gas of the aqueous solution of agent；
Step 3, the surrounding of closed container is heated, heating-up temperature is 50 DEG C, and is incubated 2h；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if electric
There is colour developing point or color development area in wicking surface, then judge that the battery core has leakage；
Indicator does not corrode lug and encapsulating material, and the ion concentration that the molecular concentration of indicator or ionization go out becomes with pH value
Change and change, and indicator changes with pH value under acid or weakly acidic condition and different colors is presented.Indicator itself is colourless,
And it can be developed the color under sour environment.
Embodiment 3
The present embodiment provides a kind of secondary cell method for conducting leak test, comprises the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping to -60Kpa and pressurize 80s, then
Argon gas is filled with, so circulation 3 times；
Step 2, after circulation terminates, the instruction dissolved with 1wt%~80wt% that humidity is 50% is filled with into closed container
The atomization gas of the aqueous solution of agent；
Step 3, the bottom of closed container is heated, heating-up temperature is 60 DEG C, and is incubated 1.5h；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if electric
There is colour developing point or color development area in wicking surface, then judge that the battery core has leakage；
Indicator does not corrode lug and encapsulating material, and the ion concentration that the molecular concentration of indicator or ionization go out becomes with pH value
Change and change, and indicator changes with pH value under acid or weakly acidic condition and different colors is presented.Indicator itself is colourless,
And it can be developed the color under sour environment.
Embodiment 4
The present embodiment provides a kind of secondary cell method for conducting leak test, comprises the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping to -80Kpa and pressurize 60s, then
Air and argon gas are filled with, so circulation 3 times；
Step 2, after circulation terminates, the instruction dissolved with 1wt%~80wt% that humidity is 60% is filled with into closed container
The atomization gas of the organic solution of agent and the mixed solution of water；
Step 3, the bottom of closed container is heated, heating-up temperature is 70 DEG C, and is incubated 1h；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if electric
There is colour developing point or color development area in wicking surface, then judge that the battery core has leakage；
Indicator does not corrode lug and encapsulating material, and the ion concentration that the molecular concentration of indicator or ionization go out becomes with pH value
Change and change, and indicator changes with pH value under acid or weakly acidic condition and different colors is presented.Indicator itself has face
Color, and it is colourless under weakly alkaline environment, first indicator is debugged into colourless solution, the solution under alkaline environment and meets soda acid after acid
Neutralize, indicator returns to the color of itself.
Embodiment 5
The present embodiment provides a kind of secondary cell method for conducting leak test, comprises the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping to -100Kpa and pressurize 40s, then
Nitrogen and argon gas are filled with, so circulation 4 times；
Step 2, after circulation terminates, the instruction dissolved with 1wt%~80wt% that humidity is 75% is filled with into closed container
The atomization gas of the organic solution of agent and the mixed solution of water；
Step 3, the surrounding of closed container is heated, heating-up temperature is 80 DEG C, and is incubated 0.5h；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if electric
There is colour developing point or color development area in wicking surface, then judge that the battery core has leakage；
Indicator does not corrode lug and encapsulating material, and the ion concentration that the molecular concentration of indicator or ionization go out becomes with pH value
Change and change, and indicator changes with pH value under acid or weakly acidic condition and different colors is presented.Indicator itself has face
Color, and it is colourless under weakly alkaline environment, first indicator is debugged into colourless solution, the solution under alkaline environment and meets soda acid after acid
Neutralize, indicator returns to the color of itself.
Embodiment 6
The present embodiment provides a kind of secondary cell method for conducting leak test, comprises the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping to -120Kpa and pressurize 20s, then
Air, nitrogen and argon gas are filled with, so circulation 4 times；
Step 2, after circulation terminates, the instruction dissolved with 1wt%~80wt% that humidity is 90% is filled with into closed container
The atomization gas of the organic solution of agent and the mixed solution of water；
Step 3, the surrounding of closed container is heated, heating-up temperature is 90 DEG C, and is incubated 0.1h；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if electric
There is colour developing point or color development area in wicking surface, then judge that the battery core has leakage；
Indicator does not corrode lug and encapsulating material, and the ion concentration that the molecular concentration of indicator or ionization go out becomes with pH value
Change and change, and indicator changes with pH value under acid or weakly acidic condition and different colors is presented.Indicator itself has face
Color, and it is colourless under weakly alkaline environment, first indicator is debugged into colourless solution, the solution under alkaline environment and meets soda acid after acid
Neutralize, indicator returns to the color of itself.
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 (10)
1. a kind of secondary cell method for conducting leak test, it is characterised in that comprise the following steps：
Step 1, packaged battery core is inserted in closed container, to container vacuum-pumping and pressurize, be re-filled with gas, so follow
Ring；
Step 2, after circulation terminates, the high humidity gas with indicator is filled with into closed container；
Step 3, closed container is heated and is incubated；
Step 4, terminate to heat and take out battery core, observation battery core surface is with the presence or absence of colour developing point or color development area, if battery core table
There is colour developing point or color development area in face, then judge that the battery core has leakage；
The indicator does not corrode lug and encapsulating material, and the ion concentration that the molecular concentration of the indicator or ionization go out is with pH
Value changes and change, and the indicator changes with pH value under acid or weakly acidic condition and different colors is presented.
2. secondary cell method for conducting leak test according to claim 1, it is characterised in that：It is described to take out in step 1
The vacuum of vacuum is -20~-120KPa.
3. secondary cell method for conducting leak test according to claim 1, it is characterised in that：In step 1, the guarantor
1~120s of time of pressure.
4. secondary cell method for conducting leak test according to claim 1, it is characterised in that：It is described to follow in step 1
The number of ring is at least 2 times.
5. secondary cell method for conducting leak test according to claim 1, it is characterised in that：In step 1, it is filled with
Gas is any one or more mixing in air, nitrogen and argon gas.
6. secondary cell method for conducting leak test according to claim 1, it is characterised in that：In step 2, the band
The high humidity gas for having indicator is the atomization gas dissolved with the aqueous solution of 1wt%~80wt% indicator, or for dissolved with 1%
The atomization gas of the organic solution of wt~80%wt indicator and the mixed solution of water.
7. secondary cell method for conducting leak test according to claim 1, it is characterised in that：In step 2, the height
The humidity of humid gas is 30%~90%.
8. secondary cell method for conducting leak test according to claim 1, it is characterised in that：It is described to add in step 3
Heat is the bottom-heated to closed container or the heating of the surrounding to closed container.
9. secondary cell method for conducting leak test according to claim 1, it is characterised in that：It is described to add in step 3
The temperature of heat is 40~90 DEG C.
10. secondary cell method for conducting leak test according to claim 1, it is characterised in that：In step 3, the guarantor
The time of temperature is 0.1~3h.
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Cited By (8)
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| CN108645570A (en) * | 2018-04-27 | 2018-10-12 | 江苏理工学院 | A kind of package seal checker of blood perfusion device |
| CN108931343A (en) * | 2018-06-15 | 2018-12-04 | 东莞百思利新能源科技有限公司 | A kind of method of inspection of products air tightness |
| CN109186874A (en) * | 2018-08-16 | 2019-01-11 | 湖南立方新能源科技有限责任公司 | Quick-speed leak detection method |
| CN109212132A (en) * | 2018-08-22 | 2019-01-15 | 湖南立方新能源科技有限责任公司 | A kind of soft-package battery encapsulation failure detection method |
| CN109701909A (en) * | 2018-12-18 | 2019-05-03 | 东莞市振华新能源科技有限公司 | A method of screening rectangular lithium ion battery leakage |
| CN113188725A (en) * | 2020-01-14 | 2021-07-30 | 郑州深澜动力科技有限公司 | Lithium battery leakage point position detection method |
| CN113494981A (en) * | 2020-04-03 | 2021-10-12 | 深圳格林德能源集团有限公司 | Method for rapidly detecting liquid leakage point of soft package lithium ion battery |
| CN113932985A (en) * | 2021-10-14 | 2022-01-14 | 湖南兴旭能新能源科技有限公司 | Lithium ion battery leak detection method |
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| CN109186874A (en) * | 2018-08-16 | 2019-01-11 | 湖南立方新能源科技有限责任公司 | Quick-speed leak detection method |
| CN109212132A (en) * | 2018-08-22 | 2019-01-15 | 湖南立方新能源科技有限责任公司 | A kind of soft-package battery encapsulation failure detection method |
| CN109701909A (en) * | 2018-12-18 | 2019-05-03 | 东莞市振华新能源科技有限公司 | A method of screening rectangular lithium ion battery leakage |
| CN113188725A (en) * | 2020-01-14 | 2021-07-30 | 郑州深澜动力科技有限公司 | Lithium battery leakage point position detection method |
| CN113494981A (en) * | 2020-04-03 | 2021-10-12 | 深圳格林德能源集团有限公司 | Method for rapidly detecting liquid leakage point of soft package lithium ion battery |
| CN113932985A (en) * | 2021-10-14 | 2022-01-14 | 湖南兴旭能新能源科技有限公司 | Lithium ion battery leak detection method |
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Application publication date: 20180403 |