CN114623985A - Soft package battery leakage detection method and application method thereof - Google Patents
Soft package battery leakage detection method and application method thereof Download PDFInfo
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- CN114623985A CN114623985A CN202110948293.6A CN202110948293A CN114623985A CN 114623985 A CN114623985 A CN 114623985A CN 202110948293 A CN202110948293 A CN 202110948293A CN 114623985 A CN114623985 A CN 114623985A
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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
Abstract
The invention discloses a soft package battery leakage detection method and an application method thereof, aiming at solving the problems of low efficiency and high equipment requirement of the existing lithium ion battery leakage detection equipment, the detection method comprises the following steps: q1: placing the soft package battery into a closed space; q2: vacuumizing the closed space to maintain the pressure of the soft package battery at a specific air extraction pressure for a specific air extraction time; q3: performing thickness detection on the cell subjected to pressure maintaining; q4: and comparing the thickness expansion value with the thickness expansion judgment standard, and determining that the expansion exceeds the standard value as an unqualified product. The invention has the beneficial effects that: the misjudgment of the normal battery due to the precipitation of trace gas or the volatilization of the solvent in the normal battery can be avoided, or the normal battery is damaged due to the irreversible residue of the dissolved precipitated gas; by adopting the steps S2-S7 of the application method of the soft package battery leakage detection method, the optimal test parameters can be formulated for different products, and the product practicability is high.
Description
Technical Field
The invention relates to the field of soft package battery detection, in particular to a soft package battery leakage detection method and an application method thereof.
Background
Lithium ion battery is an organic electrolyte system, and is unusually sensitive to water and air, and its encapsulation inefficacy can lead to the battery performance to appear unusually, still can lead to the safety problem in the use when serious, and to this problem, battery manufacturing enterprise usually can increase in process of production and reveal detection device to the defective products in the discernment production avoid the problem battery to flow out.
The utility model provides a "soft packet of lithium cell micropore weeping automatic checkout device" that discloses on chinese patent literature, its notice No. CN212059287U, including the conveying mechanism who is used for transporting the material, be equipped with the malleation test subassembly between the conveying mechanism, conveying mechanism just is located the discharge end department of malleation test subassembly and is equipped with the inductor subassembly that carries out the surface flatness and detect, inductor subassembly and outside control terminal electric connection. The utility model discloses in, carry out the malleation to the battery in the airtight die cavity that constitutes by the moulding-die and detect, work as last, the moulding-die is closed down, on, the detection sucking disc on the moulding-die inner wall down respectively with the battery on, the intimate contact below, aerify for the airtight cavity that the moulding-die constitutes through the trachea with certain setting value, pressurize 36s after the pressure valve detects and reaches the setting value, if there is the small opening on the battery surface, perhaps the banding has the fracture of inefficacy, then high-pressure gas can get into inside the battery through the position of inefficacy, form the pressure differential with the sucking disc coverage area, thereby make sucking disc coverage position or whole battery surface bulge. The disadvantages are that: soft packet of lithium cell packing is soft, and the adsorption disc can produce the impression on the surface of the package, influences the product sale, and simultaneously, current soft packet of battery surface is not absolute level and smooth, and the sealed validity of adsorption disc is difficult to guarantee, and moreover, the expanded gas source of battery is aerifyd for the external world, and it is slow to take effect.
The patent (grant publication No. CN 209296241U) discloses a battery core weeping check out test set, which adopts the method of vacuumization to accelerate the outflow volatilization of electrolyte and the detection of VOC detection device to identify the weeping problem. Although the detection mode can detect a bad battery cell, the detection time is longer than 15s, the negative pressure is-95 Kpa, the electrolyte is ensured to volatilize and to be detected by a high-sensitivity detection device, the equipment efficiency is low, meanwhile, the volatilized gas needs to be fully dissipated when the next pack of battery cells comes in, the production continuity is ensured, the equipment requirement is high, and the technology is complex.
Disclosure of Invention
The invention mainly aims to solve the problems of low efficiency and high equipment requirement of the existing lithium ion battery leakage detection equipment, and provides a soft package battery leakage detection method and an application method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a soft package battery leakage detection method comprises the following steps:
q1: placing the soft package battery into a closed space;
q2: vacuumizing the closed space to maintain the pressure of the soft package battery at a specific air extraction pressure for a specific air extraction time;
q3: performing thickness detection on the battery subjected to pressure maintaining;
q4: and comparing the thickness expansion value with the thickness expansion judgment standard, and determining that the expansion exceeds the standard value as an unqualified product.
Preferably, the thickness expansion determination criterion is that the thickness variation is less than 3 mm.
The thickness expansion change is 3 mm, which is a standard for judging whether a battery is qualified, so that the accuracy of the method can be better improved by setting the thickness change to be smaller than the set thickness expansion judgment standard.
Preferably, the thickness expansion determination criterion is that the thickness variation is less than 1 mm.
The thickness expansion change is 1 mm, which is a standard for judging whether a battery is good, so that the accuracy of the method can be better improved by setting the thickness change to be smaller than the thickness expansion judgment standard. The thickness expansion change is 0.5 mm, which is a standard for judging whether a battery is high-end, and can be used as a standard for judging subsequent batteries.
In order to ensure the smooth implementation of the soft package battery leakage detection method, the invention also comprises an application method of the soft package battery leakage detection method, which is used for determining the specific air pumping pressure and the specific air pumping time and comprises the following steps:
s1: placing the soft package battery into a closed space;
s2: setting the pumping air pressure to be more than or equal to the initial pumping air pressure, setting the pumping time, carrying out vacuum pumping treatment on the closed space, detecting the expansion thickness of the soft package battery, and determining the residual quantity of battery gas after measurement;
s3: changing the evacuation time, and repeating the step S2;
s4: analyzing the change of thickness expansion and gas residual quantity along with the increase of evacuation time, and taking the time when the thickness of the battery and the gas residual quantity do not obviously change any more as the test time for leakage detection;
s5: setting the test time determined in the step S3 as evacuation time, setting the evacuation pressure as initial evacuation pressure, performing evacuation treatment on the sealed space, performing thickness expansion detection, and determining the residual quantity of the battery gas after measurement;
s6: changing the air pumping pressure, and repeating the step S5;
s7: and analyzing the change of the thickness expansion and the gas residual quantity along with the increase of the air pumping pressure, and taking the air pressure at which the thickness of the battery and the gas residual quantity do not obviously change any more as the air pumping pressure for leakage detection.
And S2 and S5 are performed by vacuumizing the sealed space, so that the thickness of the soft package battery placed in the sealed space is expanded due to the difference between the internal pressure and the external pressure, and the soft package battery is identified and judged by the thickness detection device. The thickness detection method adopted by the thickness detection device is a laser ranging method. The vacuum pumping method is adopted, so that the battery thickness is changed due to the separation of gas in the battery without strong inflation, the expansion speed of the battery is high, and the test is rapid.
The initial evacuation pressure in steps S2 and S5 is the lower evacuation pressure limit, i.e., the pressure value of the last evacuation of the battery.
Through the steps S2-S7, an iterative verification method is used to avoid that a normal battery is mistakenly judged due to the precipitation of trace gas or solvent volatilization in the normal battery or is damaged due to irreversible residue of dissolved precipitated gas, and the method is ensured to be smoothly applied to the formulation of detection conditions.
According to the method, under a certain vacuum condition, the battery can expand due to gas precipitation or solvent volatilization in the soft package battery, so that the leakage battery can be identified according to the thickness change of the battery, more gas is dissolved in the leakage battery, and the requirement on the vacuum degree is low.
Preferably, step S3 includes the following steps:
s31: gradually increasing the evacuation test time for 1-5 seconds;
s32: and repeating the step S2 until the thickness of the soft package battery is not obviously changed any more.
The relationship between thickness expansion and evacuation time was analyzed by gradually increasing the evacuation test time until no significant change in cell thickness occurred, and the test time used for leak testing was determined. The method can accurately determine the testing time, increases 1-5 seconds each time, can prevent the situation of excessive evacuation caused by overlong evacuation time, and improves the accuracy of the method.
Preferably, the step-up evacuation test time in step S31 is 2 seconds.
Each increment of time is 2 seconds, which allows a more accurate determination of the test time.
Preferably, step S6 includes the following steps:
s61: gradually increasing the air pumping pressure of 5-20 torr;
s62: and repeating the step S5 until the thickness of the soft package battery is not obviously changed any more.
And analyzing the relation between the thickness expansion and the air pumping pressure by gradually increasing the air pumping pressure until the thickness of the battery does not change obviously any more, and determining the air pumping pressure used for leakage detection. The method can accurately determine the testing time, increases 5-20 torr each time, can prevent the situation of excessive evacuation caused by excessive increase of the air pumping pressure, and improves the accuracy of the method.
Preferably, the increase in the extraction air pressure is increased stepwise by 10 torr.
The suction air pressure can be determined more accurately by increasing the suction air pressure to 10torr each time.
Preferably, the method for confirming the residual amount of battery gas is an ultrasonic detection method.
The ultrasonic detection method can be used for detecting the surface and internal quality of the detected part on the premise of not damaging the working state of the workpiece or raw materials, so that the accuracy of the method is improved.
The standard for identifying gas residue by ultrasonic detection method is less than 10%, more precisely less than 5%, and the most suitable standard can be used according to the requirement.
The invention has the beneficial effects that:
(1) the method can avoid the damage of the normal battery caused by the precipitation of trace gas or the volatilization of the solvent in the normal battery or the irreversible residue of the dissolved precipitated gas.
(2) The vacuum pumping method is adopted, so that the battery thickness is changed due to the separation of gas in the battery without strong inflation, the expansion speed of the battery is high, and the test is rapid.
(3) By adopting the steps S2-S7 of the application method of the soft package battery leakage detection method, the optimal test parameters can be formulated for different products, and the practicability of the products is strong.
(4) The lower limit of the pumping air pressure is used as the initial pumping air pressure, the test conditions are gradually relaxed, the finally determined pumping air pressure can identify the leakage battery, the normal battery cannot be damaged, the gas evolution quantity in the battery is controllable, and the problem that the use of the battery is influenced by the residual bubbles is avoided.
Drawings
FIG. 1 is a schematic flow diagram of a detection method.
Fig. 2 is a flow chart schematic of an application method.
Detailed Description
The invention further discloses a soft package battery leakage detection method and an application method thereof, which are described in the following with reference to the accompanying drawings and the detailed description.
The first embodiment is as follows:
a soft package battery leakage detection method comprises the following steps:
q1: placing the soft package battery into a closed space;
q2: vacuumizing the closed space to ensure that the soft package battery is maintained under a specific air extraction pressure for a specific air extraction time;
q3: performing thickness detection on the battery subjected to pressure maintaining;
q4: and comparing the thickness expansion value with the thickness expansion judgment standard, and determining that the expansion exceeds the standard value as an unqualified product.
The thickness swell criterion is a thickness variation of less than 3 mm.
The thickness expansion change is 3 mm, which is a standard for judging whether a battery is qualified, so that the accuracy of the method can be better improved by using the thickness change smaller than the set thickness expansion judgment standard.
The thickness swell criterion is a thickness variation of less than 1 mm.
The thickness expansion change is 1 mm, which is a standard for judging whether a battery is excellent, so that the accuracy of the method can be better improved by using the thickness change smaller than the set thickness expansion judgment standard. The thickness expansion change is 0.5 mm, which is a standard for judging whether a battery is high-end, and can be used as a standard for judging subsequent batteries.
As shown in fig. 1, an application method of a soft package battery leakage detection method includes the following steps:
s1: placing the soft package battery into a closed space;
s2: setting the air pumping pressure to be 150torr, setting the air pumping time to be 1s, carrying out vacuum pumping treatment on the closed space, detecting the expansion thickness of the soft package battery, and determining the residual quantity of the gas in the battery cell after measurement;
s3: changing the evacuation time to 2S,5S,10S and 15S in sequence, and repeating the step S2;
s4: analyzing the change of thickness expansion and gas residual quantity along with the increase of evacuation time, and taking the time 5s when the thickness of the battery and the gas residual quantity do not obviously change any more as the test time for leakage detection;
s5: setting the test time determined in the step S3 as evacuation time, setting the evacuation air pressure as initial evacuation air pressure, carrying out evacuation treatment on the closed space, carrying out thickness expansion detection, and determining the residual quantity of the battery cell gas after measurement;
s6: changing the air pumping pressure, and repeating the step S5;
s7: and analyzing the thickness expansion and the change of the gas residual quantity along with the increase of the pumping pressure, and taking the pumping pressure 35torr without obvious change of the battery thickness and the gas residual quantity as the pumping pressure for leakage detection.
The experimental data of the application method are as follows:
and (3) verifying the thickness expansion (mm) of the battery cell under the condition of the air pumping pressure of 150 torr:
and verifying the change of the gas residual quantity of the battery cell along with time under the condition of pumping air pressure of 150 torr:
thickness swell (mm) of the cell was verified at evacuation time 5 s:
and (5) checking the gas residual quantity of the battery cell along with the change of the pumping air pressure under the pumping time of 5 s:
finally, by the application method, the test condition of leakage detection is determined to be 5s detection time, and air is pumped at 35 torr.
And S2 and S5 are performed by vacuumizing the sealed space, so that the thickness of the soft package battery placed in the sealed space is expanded due to the difference between the internal pressure and the external pressure, and the soft package battery is identified and judged by the thickness detection device. The thickness detection method adopted by the thickness detection device is a laser ranging method. By adopting the vacuum pumping method, the battery thickness is changed due to the separation of gas in the battery without strong inflation, the expansion speed of the battery is high, and the test is rapid.
The initial evacuation pressure in steps S2 and S5 is the lower evacuation pressure limit, which is 20torr, that is, the last evacuation pressure value of the battery.
Through the steps S2-S7, an iterative verification method is used to avoid that a normal battery is mistakenly judged due to the precipitation of trace gas or solvent volatilization in the normal battery or is damaged due to irreversible residue of dissolved precipitated gas, and the method is ensured to be smoothly applied to the formulation of detection conditions.
According to the method, under a certain vacuum condition, the battery can expand due to gas precipitation or solvent volatilization in the soft package battery, so that the leakage battery can be identified according to the thickness change of the battery, more gas is dissolved in the leakage battery, and the requirement on the vacuum degree is low.
The step S3 includes the following steps:
s31: gradually increasing the evacuation test time for 1-5 seconds;
s32: and (5) repeating the step S2 until the expansion of the thickness of the soft package battery does not change obviously.
The relationship between thickness expansion and evacuation time was analyzed by gradually increasing the evacuation test time until no significant change in cell thickness occurred, and the test time used for leak testing was determined. The method can accurately determine the testing time, increases 1-5 seconds each time, can prevent the situation of excessive evacuation caused by overlong evacuation time, and improves the accuracy of the method.
The evacuation test time is increased stepwise to 2 seconds in step S31.
Each increment of time is 2 seconds, which allows a more accurate determination of the test time.
The step S6 includes the following steps:
s61: gradually increasing the air pumping pressure by 5-20 torr;
s62: and repeating the step S5 until the thickness of the soft package battery is not obviously changed any more.
And analyzing the relation between the thickness expansion and the air pumping pressure by gradually increasing the air pumping pressure until the thickness of the battery does not change obviously any more, and determining the air pumping pressure used for leakage detection. The method can accurately determine the testing time, increases 5-20 torr each time, can prevent excessive evacuation caused by excessive increase of the air pumping pressure, and improves the accuracy of the method.
The increase in the suction air pressure was increased stepwise by 10 torr.
The extraction air pressure is increased to 10torr each time, so that the extraction air pressure can be determined more accurately.
The method for confirming the gas residue of the battery is an ultrasonic detection method.
The ultrasonic detection method can be used for detecting the surface and internal quality of the detected part on the premise of not damaging the working state of a workpiece or raw materials, so that the detection result error caused by improper detection method in the detection process is avoided, and the accuracy of the method is improved.
The standard for identifying gas residues by ultrasonic detection is less than 10%, more precisely less than 5%, and the most suitable standard can be used as required.
It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (9)
1. A soft package battery leakage detection method is characterized by comprising the following steps:
q1: placing the soft package battery into a closed space;
q2: vacuumizing the closed space to maintain the pressure of the soft package battery at a specific air extraction pressure for a specific air extraction time;
q3: performing thickness detection on the battery subjected to pressure maintaining;
q4: and comparing the thickness expansion value with the thickness expansion judgment standard, and determining that the expansion exceeds the standard value as an unqualified product.
2. The pouch cell leak test method according to claim 1, wherein the thickness expansion criterion is that the thickness variation is less than 3 mm.
3. The soft-package battery leakage detection method according to claim 2, wherein the thickness expansion criterion is that the thickness variation is less than 1 mm.
4. An application method of a soft package battery leakage detection method is suitable for any one of the soft package battery leakage detection methods of claims 1-3, and is characterized by comprising the following steps:
s1: placing the soft package battery into a closed space;
s2: setting the pumping air pressure to be more than or equal to the initial pumping air pressure, setting the pumping time, carrying out vacuum pumping treatment on the closed space, detecting the expansion thickness of the soft package battery, and determining the residual quantity of battery gas after measurement;
s3: changing the evacuation time, and repeating the step S2;
s4: analyzing the change of thickness expansion and gas residual quantity along with the increase of evacuation time, and taking the time when the thickness of the battery and the gas residual quantity do not obviously change any more as the test time for leakage detection;
s5: setting the test time determined in the step S3 as evacuation time, setting the evacuation pressure as initial evacuation pressure, performing evacuation treatment on the sealed space, performing thickness expansion detection, and determining the residual quantity of the battery gas after measurement;
s6: changing the air pumping pressure, and repeating the step S5;
s7: and analyzing the change of the thickness expansion and the gas residual quantity along with the increase of the air pumping pressure, and taking the air pressure at which the thickness of the battery and the gas residual quantity do not obviously change any more as the air pumping pressure for leakage detection.
5. The application method of the soft package battery leakage detection method according to claim 4, wherein the step S3 includes the following steps:
s31: gradually increasing the evacuation test time for 1-5 seconds;
s32: and (5) repeating the step S2 until the expansion of the thickness of the soft package battery does not change obviously.
6. The application method of the soft package battery leakage detection method according to claim 5, wherein the step-up evacuation test time in step S31 is 2 seconds.
7. The application method of the soft package battery leakage detection method according to claim 4, characterized in that the step S6 includes the following steps:
s61: gradually increasing the air pumping pressure of 5-20 torr;
s62: and repeating the step S5 until the thickness of the soft package battery is not obviously changed any more.
8. The application method of the soft package battery leakage detection method according to claim 5, wherein the increase value of the step-by-step increase of the pumping air pressure is 10 torr.
9. The application method of the soft package battery leakage detection method according to claim 4, characterized in that the method for confirming the residual battery gas amount is an ultrasonic detection method.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115090558A (en) * | 2022-07-30 | 2022-09-23 | 东莞市群立自动化科技有限公司 | Lithium battery leakage detection equipment and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115090558A (en) * | 2022-07-30 | 2022-09-23 | 东莞市群立自动化科技有限公司 | Lithium battery leakage detection equipment and detection method |
| CN115090558B (en) * | 2022-07-30 | 2023-03-03 | 东莞市群立自动化科技有限公司 | Lithium battery leakage detection equipment and detection method |
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