CN111579158A - Method for testing air tightness of soft package battery - Google Patents
Method for testing air tightness of soft package battery Download PDFInfo
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- CN111579158A CN111579158A CN202010426706.XA CN202010426706A CN111579158A CN 111579158 A CN111579158 A CN 111579158A CN 202010426706 A CN202010426706 A CN 202010426706A CN 111579158 A CN111579158 A CN 111579158A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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Abstract
The invention discloses a method for testing the air tightness of a soft package battery, wherein the soft package battery contains electrolyte or an organic solvent, and the method comprises the following steps: judging the air tightness of the soft package battery according to the weight change of the soft package battery before and after vacuum treatment; the vacuum-pumping treatment comprises the following steps: and placing the soft package battery in a container, and vacuumizing to a preset air pressure value, wherein the preset air pressure value is within the range of 0-0.1 MPa and does not contain 0. The method can test the sealing quality of the soft package battery in the final state, can comprehensively test the top side sealing air tightness quality, and simulates the impact of gas and liquid on the edge sealing of the aluminum plastic film in a vacuumizing mode, so that the judgment result is more scientific and reliable.
Description
Technical Field
The invention relates to the field of soft package battery airtightness detection, relates to a soft package battery airtightness detection method, and particularly relates to a top side seal airtightness quality detection method for a soft package lithium ion battery.
Background
Aluminum plastic films are widely used in the battery industry as the outer packaging of lithium ion batteries. The air tightness quality after the aluminum-plastic film is subjected to heat sealing is related to whether the battery can be used for a long time, and if the sealing is not good, the risk of bulging and even liquid leakage can be generated, so that the performance of the battery is rapidly deteriorated and the personal safety is even affected.
The packaging process of the soft package battery in the prior art is generally as follows: the aluminum plastic film is punched according to the standard battery size requirement, generally comprises one or two symmetrical punched pits for containing battery cores, and also comprises an air chamber. And (3) loading the battery core which is wound or laminated and welded with the lug into the aluminum-plastic film punched with the pit, and folding and buckling the aluminum-plastic film to wrap the battery core. The top sealed edge of the polar ear position and one edge sealed edge are firstly heat sealed, and the remained edge sealed edge is not sealed. And injecting a certain amount of electrolyte or organic solvent with similar properties, and heat-sealing the unsealed edge seal. And then, performing air suction sealing to finish final edge sealing, cutting off an air bag part of the aluminum-plastic film, finishing packaging of the soft package battery and manufacturing the soft package battery. Because electrolyte and steam belong to liquid and gas, any tiny gap is possible to pass through, and particularly for the flexible package lithium ion battery, the aluminum plastic film and the lug are thermally sealed together by the edge seal at one position, so that the electrolyte or the steam is easy to leak.
At present, the sealing quality of a battery is generally inspected by thermally sealing two aluminum plastic films together, cutting the two aluminum plastic films by a certain width, peeling the two aluminum plastic films by a tensile machine at a 180-degree T shape, and determining the quality according to the peeling force. The values measured in this manner are based on the total peel force of a given width of the seal area and do not indicate that every tiny area is well sealed and that the test sample is not a cell in the final state.
CN 110608860A discloses a method for detecting the air tightness of a soft package battery, which detects 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. The method uses a non-contact battery thickness measurement method 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 meanwhile, the detection accuracy and the data reliability are ensured.
CN 110160714a discloses a soft package battery airtightness inspection system and method, the method includes: (1) placing a soft package battery to be tested in the working cavity; (2) a positive pressure amplification stage: amplifying the gas quantity discharged from a leakage port of the soft package battery, filling the pressure of 100-600 kPa into the working cavity, controlling the time to be 1-5s, and exhausting after the filling is finished; (3) and (3) a negative pressure inflation stage: after the positive pressure amplification stage is finished, immediately filling negative pressure into the working cavity, and controlling the time to be 1-5 s; (4) and (3) a negative pressure balancing stage: keeping the pressure in the standard cavity and the working cavity to reach the set pressure of-10 kPa to-99 kPa at the same time, and separating the standard cavity and the working cavity to ensure that the pressure in the standard cavity and the pressure in the working cavity are respectively stable, wherein the stable stage is controlled within 1 s-2 s; (5) a detection stage: after the negative pressure balancing stage is finished, the pressure of-10 kPa to-99 kPa is kept in the standard cavity and the working cavity, the original reserved gas pressure of the battery in the working cavity is 0kPa, the gas leaked from the soft package battery overflows through the leakage port under the pressure of-10 kPa to-99 kPa, the pressure in the working cavity rises continuously, the pressure of the working cavity is compared with the pressure of the standard cavity, and the leakage amount is converted through the differential sensor.
However, the method is complicated in operation, inconvenient to use and low in detection precision, the pressure difference is compared by pure gas, the poor capillary channel in the packaging process cannot be detected effectively in time, and the risk of missing detection exists.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for testing the air tightness of a soft package battery, in particular to a method for testing the top side sealing air tightness quality of a soft package lithium ion battery. The method can test the sealing quality of the soft package battery in the final state, can comprehensively test the top side sealing air tightness quality, and simulates the impact of gas and liquid on the edge sealing of the aluminum plastic film in a vacuumizing mode, so that the judgment result is more scientific and reliable.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for testing the air tightness of a soft package battery, wherein the soft package battery contains electrolyte or an organic solvent, and the method comprises the following steps:
judging the air tightness of the soft package battery according to the weight change of the soft package battery before and after vacuum treatment;
the vacuum-pumping treatment comprises the following steps: and placing the soft package battery in a container, and vacuumizing to a preset air pressure value, wherein the preset air pressure value is within the range of 0-0.1 MPa and does not contain 0.
In the method of the present invention, the predetermined pressure value may be, for example, 0.01MPa, 0.03MPa, 0.04MPa, 0.05MPa, 0.06MPa, 0.07MPa, 0.08MPa, 0.09MPa, or 0.1 MPa.
In the method, the electrolyte or the organic solvent slightly volatilizes, the container (such as an oven cavity) is in a vacuum negative pressure state, the pressure difference between the container and the pressure inside the battery cell of the soft package battery is extremely poor, and the pressure inside the battery cell can form large pressure under the action of the pressure difference. If the packaging quality of the soft package battery is not good (if air holes and micro air holes exist in the package or the packaging strength is not enough), the fluid (such as electrolyte or organic solvent with similar properties) in the electric core volatilizes and leaks outwards under the action of the pressure difference between the inside and the outside of the cavity, so that the weights of the soft package battery to be tested before and after vacuum treatment are inconsistent, and the air tightness of the soft package battery is not qualified; if the packaging quality is good, namely the air tightness is qualified, the electrolyte and other fluids in the electric core cannot volatilize and leak, and the weight of the soft package battery to be tested is unchanged before and after vacuum treatment.
The method can test the sealing quality of the soft package battery in the final state, and simulates the impact of gas and liquid on the edge sealing of the aluminum plastic film in a vacuumizing mode, so that the judgment result is more scientific and reliable.
As a preferable technical scheme of the method, the preset pressure value is 0.03MPa to 0.08 MPa. If the pressure value is too large (the vacuum degree is low), the internal and external pressure difference is small, and the packaging effect is difficult to detect quickly (the internal of the battery cell is in a state of standard atmospheric pressure or a state close to the standard atmospheric pressure in a normal state); and if the pressure value is too small (the vacuum degree is high), the qualified product is subjected to negative pressure to reduce the packaging strength, which is equivalent to actively exerting negative effect on the qualified product. In order to better achieve the purposes of rapidly detecting the package and ensuring good package strength, the preset pressure value is preferably 0.03MPa to 0.08MPa, and more preferably 0.06MPa to 0.08 MPa.
In order to rapidly generate impact penetration of the electrolyte or the organic solvent to the leak hole (such as the leak hole caused by poor sealing) to achieve better airtightness test effect, the vacuum treatment is preferably performed under certain temperature conditions. The temperature is selected in relation to the composition of the electrolyte or the organic solvent.
Preferably, the vacuum treatment is carried out in the range of 60 ℃ to 150 ℃, preferably at a constant temperature. The temperature is, for example, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 125 ℃, 135 ℃, 145 ℃ or 150 ℃. The organic solvent needs to have the volatile reaction time, the gas volatilization is promoted under a certain temperature environment, and the packaging effect of the packaging strength or the sealing property under the action of the gas expansion pressure can be detected.
In the invention, the vacuumizing is to form a large pressure contrast inside and outside the battery core of the soft package battery to be tested, and as the battery core is preliminarily packaged to have a certain airtight effect, even if the battery core has non-packaged micro pores, the leakage of electrolyte or the volatilization of gas also needs a process, and in order to achieve a better airtight test effect, the vacuumizing is preferably stabilized for a period of time after the vacuumizing is carried out to a preset air pressure value.
Preferably, the vacuum is pumped to a preset air pressure value and then stabilized for 5min to 30min, such as 5min, 8min, 10min, 15min, 16min, 20min, 22min, 25min or 30 min.
Preferably, the vacuuming process includes: the method comprises the steps of adopting an oven with heating, constant temperature and vacuumizing functions, setting a certain temperature within the range of 60-150 ℃ as a target temperature, placing the soft-package battery in the oven after the temperature reaches the target temperature and is constant, vacuumizing until the air pressure value is within the range of 0-0.1 MPa and does not contain 0, and placing the soft-package battery in the oven for 5-30 min.
Preferably, the preparation method of the soft package battery comprises the following steps: forming a first pit body area for accommodating the battery core and a second pit body area for forming the air bag by punching a pit on the aluminum-plastic film, and punching a shell between the first pit body area and the second pit body area to form a second edge seal for sealing;
the method comprises the steps of wrapping a battery core by an aluminum-plastic film after pit punching and forming an air bag, carrying out shell edge top sealing and side sealing to obtain a packaging body with a first edge seal and a second edge seal for injecting liquid, injecting electrolyte, then carrying out heat sealing on the first edge seal which is adjacent to the air bag and is far away from the second edge seal, forming, aging and finishing, and then carrying out heat sealing on the second edge seal, synchronously deflating the air bag and cutting off the air bag to obtain the soft package battery.
In the invention, the aluminum plastic film after the shell punching can be two independent and separated sheets or can be integrated. For example, a first pit body region and a second pit body region are respectively punched on a single aluminum-plastic film, and then two pieces of the aluminum-plastic films punched with pits are oppositely arranged and packaged to obtain a package body; or two first pit body areas and two second pit body areas can be punched on a single aluminum plastic film, and after the two first pit body areas and the two second pit body areas are folded and packaged, a package body which is oppositely arranged in the same area is formed.
The invention is not limited to the type of the battery cell, and may be, for example, a winding type battery cell or a laminated type battery cell.
Preferably, the battery core is provided with a tab, and the edge seal corresponding to the top seal of the edge of the shell is the top seal edge of the tab position.
The kind of the electrolyte and the organic solvent are not limited in the present invention, and the liquid substances commonly used in the art are all suitable for the present invention, and the organic solvent may be, for example, Propylene Carbonate (PC), Ethylene Carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), methyl ethyl carbonate (EMC), and the like.
In the invention, the method for acquiring the weight of the soft package battery before and after vacuum treatment is not limited, and for example, the soft package battery before and after vacuum treatment can be weighed by a balance to obtain corresponding weight data.
The method for judging the air tightness of the soft package battery comprises the following steps: the change of the weight of the soft package battery before and after vacuum treatment is within the error range of an instrument for testing the weight, and the air tightness is qualified; otherwise, the airtightness is not qualified.
As a further preferred technical solution of the method of the present invention, the method comprises the steps of:
(1) forming a first pit body area for accommodating the battery core and a second pit body area for forming the air bag by punching a pit on the aluminum-plastic film, and punching a shell between the first pit body area and the second pit body area to form a second edge seal for sealing;
wrapping the battery core welded with the tab by using an aluminum-plastic film after pit punching to form an air bag, heat-sealing a top edge seal and a side edge seal of the tab position to obtain a packaging body with a first edge seal and a second edge seal for liquid injection, injecting electrolyte, then heat-sealing the first edge seal which is adjacent to the air bag and is far away from the second edge seal, forming, aging, and after finishing, heat-sealing the second edge seal, synchronously deflating the air bag, and cutting off the air bag to obtain a soft package battery;
(2) and (3) testing the weight of the soft package battery to be tested by adopting a precise electronic balance, and recording the weight as m1；
(3) Adopting an oven with heating, constant temperature and vacuumizing functions, setting a certain temperature within the range of 60-150 ℃ as a target temperature, placing the soft-package battery in the oven after the temperature reaches the target temperature and is constant, vacuumizing until the air pressure value is within the range of 0-0.1 MPa and does not contain 0, and placing the soft-package battery in the oven for 5-30 min;
(4) and (4) releasing the vacuum, taking out the soft package battery, testing the weight of the soft package battery after vacuumizing again by adopting the precision electronic balance under the same condition, and recording the weight as m2；
(5) According to m1And m2The air tightness of the soft package battery is judged according to the numerical value, and the air tightness is qualified if the weight change of the soft package battery before and after vacuum treatment is within the error range of a weight testing instrument; otherwise, the airtightness is not qualified.
In the preferred technical scheme, the electrolyte generates impact permeation to the leak hole at a proper temperature, the soft package battery cell to be tested is vacuumized to a proper air pressure value to form a large pressure contrast inside and outside the soft package battery cell, the impact of gas and liquid to the edge sealing of the aluminum plastic film is simulated by heating and vacuumizing, and the judgment result is more scientific and reliable.
Compared with the prior art, the invention has the following beneficial effects:
the method can test the sealing quality of the soft package battery in the final state, can comprehensively test the top side sealing air tightness quality, and simulates the impact of gas and liquid on the edge sealing of the aluminum plastic film in a vacuumizing mode, so that the judgment result is more scientific and reliable.
And the vacuum treatment is preferably carried out at a certain temperature, so that the impact of gas and liquid on the edge sealing of the aluminum-plastic film is more accurately simulated, and the judgment structure is more accurate.
Drawings
Fig. 1 is a schematic structural diagram of a package obtained in the embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment of the invention partially provides a method for testing the air tightness of a soft package battery, and the preparation method of the soft package battery comprises the following steps:
forming a first pit body area 3 for accommodating a battery core and a second pit body area 2 for forming an air bag by punching pits on an aluminum plastic film (with the thickness of 152 microns), and forming a second edge seal 5 for sealing by punching a shell between the first pit body area 3 and the second pit body area 2;
adopt the aluminium-plastic film after dashing the hole to wrap the electric core that has utmost point ear and form the air pocket, the top banding and the side seal of utmost point ear position heat-seal earlier, obtain and leave the packaging body 1 that is used for annotating the open first edge of liquid and seals 6 and second edge seal 5, pour into electrolyte into, then will adjoin the air pocket and keep away from the first edge seal 6 heat-seals of second edge seal 5, become, age, accomplish after will the second edge seal 5 heat-seals to give the air pocket gassing and cut out the air pocket in step, obtain soft package battery, also be the sample that awaits measuring promptly.
The structure of the package obtained in this embodiment is schematically shown in fig. 1.
It should be understood by those skilled in the art that the above method is only an exemplary method, and the air tightness test method of the present invention is not only applicable to the pouch battery prepared by the above method, but also applicable to the pouch battery prepared by other methods.
Example 1
(1) Weighing the soft package battery to be measured by adopting a precise electronic balance, and recording the weight as m1Specifically 650.45 g.
(2) Taking an oven with heating, constant temperature and vacuumizing functions, setting the temperature to be 80 ℃, placing the soft package battery to be tested in the oven after the temperature reaches and is constant at the target temperature, vacuumizing until the air pressure value is 0.05Mpa, placing the battery in the oven for a certain time of 10min, then releasing the vacuum, taking out the soft package battery, weighing the battery again by using a precision electronic balance, and recording the weight as m2Specifically 650.44 g.
(3) Evaluating the sealing quality of the flexible package battery by the weight difference before and after the test of the battery, m1-m2When the total mass is 0.01g and 10mg, 10mg is less than 50mg, the airtightness is judged to be qualified.
Example 2
(1) Weighing the soft package battery to be measured by adopting a precise electronic balance, and recording the weight as m1Specifically 650.45 g.
(2) Taking an oven with heating, constant temperature and vacuumizing functions, setting the temperature to be 100 ℃, placing the soft package battery to be tested in the oven after the temperature reaches and is constant at the target temperature, vacuumizing until the air pressure value is 0.08Mpa, placing the battery in the oven for a certain time of 15min, then releasing the vacuum, taking out the soft package battery, weighing the battery again by using a precision electronic balance, and recording the weight as m2Specifically 650.45 g.
(3) Evaluating the quality m of the sealing quality of the soft package battery by the weight difference before and after the test of the battery1-m2And (5) judging that the air tightness is qualified because 0mg is less than 50mg when the air tightness is 0.
Example 3
(1) Weighing the soft package battery to be measured by adopting a precise electronic balance, and recording the weight as m1Specifically 650.45 g.
(2) One of the heating belts is provided withAnd the constant temperature and vacuumizing function of the oven is set to be 125 ℃, after the temperature reaches the target temperature and is constant, the soft package battery to be tested is placed in the oven, vacuumizing is carried out until the air pressure value is 0.1Mpa, the battery is placed in the oven for a certain time of 5min, then the vacuum is released, the soft package battery is taken out, the battery is weighed by the precision electronic balance again, and the weight is recorded as m2Specifically 650.44 g.
(3) Evaluating the sealing quality of the flexible package battery by the weight difference before and after the test of the battery, m1-m2When the total mass is 0.01g and 10mg, the airtightness is judged to be qualified because 10mg is less than 50 mg.
Example 4
(1) Weighing the soft package battery to be measured by adopting a precise electronic balance, and recording the weight as m1Specifically 650.45 g.
(2) Taking an oven with heating, constant temperature and vacuumizing functions, setting the temperature to be 65 ℃, placing the soft package battery to be tested in the oven after the temperature reaches and is constant at the target temperature, vacuumizing until the air pressure value is 0.07Mpa, placing the battery in the oven for a certain time of 30min, then releasing the vacuum, taking out the soft package battery, weighing the battery again by using a precision electronic balance, and recording the weight as m2Specifically 650.44 g.
(3) Evaluating the sealing quality of the flexible package battery by the weight difference before and after the test of the battery, m1-m2＝When the amount of the air-tightness is 0.01 mg to 10mg, and the amount of the air-tightness is less than 50mg, the air-tightness is judged to be qualified.
Example 5
The procedure and conditions were the same as in example 1 except that the vacuum was applied to a pressure of 0.03 MPa.
The air pressure value of the embodiment is larger than that of the embodiment 1, and although the packaging effect can be rapidly detected, the packaging strength is reduced to a certain extent, and the product quality is deteriorated.
Example 6
The cell was broken in the same manner and under the same conditions as in example 1, except that the cell was evacuated to a pressure of 0.01 MPa.
Comparative example 1
This comparative example differs from example 1 in that no evacuation step was performed.
Comparative example 2
This comparative example differs from example 2 in that no evacuation step was performed.
As can be seen from the comparison between the comparative examples 1-2 and the examples 1-2, no effective negative pressure can be provided without the vacuum-pumping step, and the packaging effect cannot be rapidly detected.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A method for testing the air tightness of a soft package battery, wherein the soft package battery contains electrolyte or organic solvent, and is characterized by comprising the following steps:
judging the air tightness of the soft package battery according to the weight change of the soft package battery before and after vacuum treatment;
the vacuum-pumping treatment comprises the following steps: and placing the soft package battery in a container, and vacuumizing to a preset air pressure value, wherein the preset air pressure value is within the range of 0-0.1 MPa and does not contain 0.
2. The method according to claim 1, wherein the predetermined pressure value is between 0.03MPa and 0.08 MPa.
3. The method according to claim 2, characterized in that the vacuum treatment is performed in the range of 60-150 ℃, preferably at a constant temperature.
4. The method according to any one of claims 1 to 3, wherein the vacuum is maintained for 5 to 30min after the evacuation to the predetermined pressure value.
5. The method according to any one of claims 1 to 4, wherein the vacuuming process comprises: the method comprises the steps of adopting an oven with heating, constant temperature and vacuumizing functions, setting a certain temperature within the range of 60-150 ℃ as a target temperature, placing the soft-package battery in the oven after the temperature reaches the target temperature and is constant, vacuumizing until the air pressure value is within the range of 0-0.1 MPa and does not contain 0, and placing the soft-package battery in the oven for 5-30 min.
6. The method according to any one of claims 1 to 5, wherein the method for preparing the pouch battery comprises: forming a first pit body area for accommodating the battery core and a second pit body area for forming the air bag by punching a pit on the aluminum-plastic film, and punching a shell between the first pit body area and the second pit body area to form a second edge seal for sealing;
the method comprises the steps of wrapping a battery core by an aluminum-plastic film after pit punching and forming an air bag, carrying out shell edge top sealing and side sealing to obtain a packaging body with a first edge seal for injecting liquid, injecting electrolyte, then carrying out heat sealing on the first edge seal, forming, aging and finishing, then carrying out heat sealing on a second edge seal, synchronously deflating the air bag and cutting off the air bag to obtain the soft package battery.
7. The method of any of claims 1-6, wherein the cells are any of wound cells or laminated cells;
preferably, the battery core is provided with a tab, and the edge seal corresponding to the top seal of the edge of the shell is the top seal edge of the tab position.
8. The method according to any one of claims 1 to 7, wherein the pouch cells before and after the vacuum treatment are weighed using a balance to obtain corresponding weight data.
9. The method according to any one of claims 1 to 8, wherein the method for judging the airtightness of the pouch battery is as follows: the change of the weight of the soft package battery before and after vacuum treatment is within the error range of an instrument for testing the weight, and the air tightness is qualified; otherwise, the airtightness is not qualified.
10. Method according to any of claims 1-9, characterized in that the method comprises the steps of:
(1) forming a first pit body area for accommodating the battery core and a second pit body area for forming the air bag by punching a pit on the aluminum-plastic film, and punching a shell between the first pit body area and the second pit body area to form a second edge seal for sealing;
wrapping the battery core welded with the tab by using an aluminum-plastic film after pit punching to form an air bag, heat-sealing a top edge seal and a side edge seal of the tab position to obtain a packaging body with a first edge seal and a second edge seal for liquid injection, injecting electrolyte, then heat-sealing the first edge seal which is adjacent to the air bag and is far away from the second edge seal, forming, aging, and after finishing, heat-sealing the second edge seal, synchronously deflating the air bag, and cutting off the air bag to obtain a soft package battery;
(2) testing the weight of the soft package battery to be tested by adopting a precision electronic balance, and marking as m 1;
(3) adopting an oven with heating, constant temperature and vacuumizing functions, setting a certain temperature within the range of 60-150 ℃ as a target temperature, placing the soft-package battery in the oven after the temperature reaches the target temperature and is constant, vacuumizing until the air pressure value is within the range of 0-0.1 MPa and does not contain 0, and placing the soft-package battery in the oven for 5-30 min;
(4) the vacuum is released, the soft package battery is taken out, the weight of the soft package battery after vacuumizing is tested again by adopting a precision electronic balance under the same condition, and the weight is recorded as m 2;
(5) according to m1And m2The air tightness of the soft package battery is judged according to the numerical value, and the air tightness is qualified if the weight change of the soft package battery before and after vacuum treatment is within the error range of a weight testing instrument; otherwise, the airtightness is not qualified.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197918A (en) * | 2020-10-26 | 2021-01-08 | 北京舍得叔叔科技有限公司 | Air tightness detection system and method |
| CN113639936A (en) * | 2021-08-13 | 2021-11-12 | 深圳市新威尔电子有限公司 | Method for detecting air tightness leakage of square-shell battery cell formation equipment |
| CN116465572A (en) * | 2023-06-20 | 2023-07-21 | 宁德时代新能源科技股份有限公司 | Battery detection equipment and method and device for detecting battery |
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| CN104577251A (en) * | 2015-01-30 | 2015-04-29 | 湖南省正源储能材料与器件研究所 | Recovery method and recovery device of aluminum plastic composite film material of flexibly-packaged lithium ion battery |
| CN109309178A (en) * | 2018-09-17 | 2019-02-05 | 苏州清陶新能源科技有限公司 | A kind of flexible lithium ion battery encapsulating material and preparation method thereof |
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| CN112197918A (en) * | 2020-10-26 | 2021-01-08 | 北京舍得叔叔科技有限公司 | Air tightness detection system and method |
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| CN116465572A (en) * | 2023-06-20 | 2023-07-21 | 宁德时代新能源科技股份有限公司 | Battery detection equipment and method and device for detecting battery |
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Application publication date: 20200825 |