CN115541145A - Soft package battery air tightness detection device and detection method - Google Patents
Soft package battery air tightness detection device and detection method Download PDFInfo
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- CN115541145A CN115541145A CN202110745645.8A CN202110745645A CN115541145A CN 115541145 A CN115541145 A CN 115541145A CN 202110745645 A CN202110745645 A CN 202110745645A CN 115541145 A CN115541145 A CN 115541145A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/34—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by testing the possibility of maintaining the vacuum in containers, e.g. in can-testing machines
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- 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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Abstract
The invention provides a device and a method for detecting the air tightness of a soft package battery, which are used for detecting the air tightness of the soft package battery, wherein the device for detecting the air tightness of the soft package battery comprises a sealed box body, a pressure testing device and a vacuum pump, the pressure testing device comprises a driving device, a pressing plate and a pressure sensor, and the vacuum pump is connected with the sealed box body; a sealing cavity is formed in the sealing box body, the pressing plate, the pressure sensor and the soft package battery are all located in the sealing cavity, and the driving device is connected with the pressing plate and used for driving the pressing plate to extrude the soft package battery; when the clamp plate extrudees laminate polymer battery, pressure sensor with laminate polymer battery contacts. The air tightness detection device and the air tightness detection method have the advantages of high detection precision, high efficiency and simple structure, and can be used for carrying out batch online detection on the air tightness of a plurality of soft package batteries.
Description
Technical Field
The invention relates to the technical field of battery airtightness detection, in particular to a device and a method for detecting the airtightness of a soft package battery.
Background
With the development of electronic technology, lithium ion batteries have the advantages of high specific power, long cycle life, good safety performance, no pollution and the like, so that the lithium ion batteries are widely applied, and soft package lithium ion batteries account for a considerable proportion in the lithium ion batteries. The air tightness of the soft package battery is of great importance to the service life of the battery cell, and methods such as helium detection, visual inspection and high-temperature soaking are common in the existing air tightness detection method of the soft package battery. The helium detection method comprises the steps of firstly injecting helium into the soft package battery, then placing the soft package battery in a sealed cavity for vacuumizing, and then detecting the content of the helium by using a helium detector, so that the air tightness of the soft package battery is judged, and the method is high in cost and complex in operation; the visual method is that the soft package battery is placed in the sealed cavity, and the air tightness of the soft package battery is judged by visually observing the expansion degree of the soft package battery after the sealed cavity is vacuumized, so that the method is low in resolution and easy to misjudge; the high-temperature soaking method is used for detecting the air tightness of the soft package battery by damaging the soft package battery, and the method is high in cost and cannot be used for on-line detection.
Disclosure of Invention
The invention aims to provide a device and a method for detecting the air tightness of a soft package battery, aiming at solving the defects of the background technology.
The embodiment of the invention provides a device for detecting the air tightness of a soft package battery, which is used for detecting the air tightness of the soft package battery, and comprises a sealed box body, a pressure testing device and a vacuum pump, wherein the vacuum pump is connected with the sealed box body; the pressure testing device comprises a driving device, a pressing plate and a pressure sensor, a sealing cavity is arranged in the sealing box body, the pressing plate, the pressure sensor and the soft package battery are all positioned in the sealing cavity, and the driving device is connected with the pressing plate and is used for driving the pressing plate to extrude the soft package battery; when the clamp plate extrudees laminate polymer battery, pressure sensor with laminate polymer battery contacts.
In an achievable mode, the sealed box body comprises an end plate and a cover, and the cover is connected with the end plate in an openable and closable mode to enable the soft package battery to be placed in and taken out.
In one implementation, the opening and closing of the cover cap and the end plate is provided with a sealing assembly.
In an achievable mode, the sealed box body is provided with an opening and closing door for the soft package battery to be put in and taken out, and the opening and closing door can be opened or closed.
In one implementation, the pressure plate is directed toward the pouch cell, and the pressure sensor is located between the pressure plate and the pouch cell.
In an achievable mode, a stop block is arranged in the sealing cavity and used for fixing or placing the soft package battery.
In an implementation manner, the driving device is located in the sealed box, a support is further disposed in the sealed box, the driving device is connected to the support, and the support is used for fixing the driving device.
In an implementable manner, the soft-package battery airtightness detection device further comprises a pressure gauge, and the pressure gauge is connected with the pressure sensor.
In an achievable mode, the number of the pressure testing device and the number of the soft package batteries are both multiple, and the pressure testing device can simultaneously detect the air tightness of the soft package batteries.
In a realizable mode, the soft package battery airtightness detection device further comprises a vacuum pipeline, the vacuum pump passes through the vacuum pipeline and the sealing box body are connected, and a vacuum meter is arranged on the vacuum pipeline.
In an achievable mode, the vacuum pump is used for vacuumizing the sealed box, after the sealed box is vacuumized, the vacuum degree in the sealed box is smaller than or equal to the vacuum degree of the soft package battery during final sealing in the manufacturing process.
Another embodiment of the invention provides a method for detecting the air tightness of a soft package battery, which is applied to the device for detecting the air tightness of the soft package battery, and the method for detecting the air tightness of the soft package battery comprises the following steps:
step one, placing a soft package battery to be tested (such as a soft package battery after being subjected to sealed vacuumizing processing or a soft package battery returned to a factory for overhaul and detection) in a sealed box body, and sealing the sealed box body;
pressing the pressing plate to be in contact with the surface of the soft package battery and tightly pressing the pressing plate until a stable detection initial state is formed, wherein the pressure display value of the pressure sensor is kept stable;
step three, vacuumizing the interior of the sealed box body;
detecting and recording a pressure change value of the pressure sensor after vacuumizing, and transmitting and recording the pressure change value to external equipment through the pressure sensor;
and fifthly, judging the air tightness state of the soft package battery according to the pressure change value.
According to the soft package battery airtightness detection device provided by the invention, the driving device drives the pressing plate to extrude the soft package battery, and when the pressing plate tightly clamps the soft package battery (the pressing plate exerts a certain acting force on the soft package battery), the pressure sensor displays stable pressure (the main purpose is to ensure an effective clamping state by exerting the stable pressure, so that the pressure change of the soft package battery during subsequent expansion can be timely and accurately detected and compared); then utilize the vacuum pump to carry out the evacuation to sealed box inside, the laminate polymer battery that the gas tightness is not good can take place the inflation this moment to make the contact pressure increase between laminate polymer battery and the clamp plate. The pressure change value between the soft package battery and the pressing plate is transmitted to an external device through a pressure sensor and recorded, and the soft package battery with the pressure change value exceeding the set range is regarded as a defective product with poor air tightness.
The device for detecting the air tightness of the soft package battery solves the problems that in the prior art, the air tightness of the soft package battery is high in detection cost, low in resolution for judging the air tightness state and not suitable for on-line detection. The air tightness detection device has the advantages that: 1. the volume change of the soft package battery is not required to be visually observed by personnel, the resolution is improved, the detection precision is high, and the classification of the airtight state of the soft package battery can be realized; 2. the efficiency is high, and the air tightness of a plurality of soft package batteries can be simultaneously detected on line in batches; 3. the soft package battery is not damaged, and the production cost is reduced; 4. simple structure and low equipment cost.
Drawings
Fig. 1 is a schematic structural diagram of a soft package battery airtightness detection device in a first embodiment of the invention.
Fig. 2 is a schematic structural diagram of a soft package battery airtightness detection device in a second embodiment of the invention.
Fig. 3 is a schematic structural diagram of a soft-package battery airtightness detection device in a third embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The terms of orientation, up, down, left, right, front, back, top, bottom, and the like (if any) referred to in the specification and claims of the present invention are defined by the positions of structures in the drawings and the positions of the structures relative to each other, only for the sake of clarity and convenience in describing the technical solutions. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
As shown in fig. 1, the device for detecting the airtightness of the pouch battery 4 according to the embodiment of the present invention is used for detecting the airtightness of the pouch battery 4, and includes a sealed box 1, a pressure testing device (not numbered in the figure), and a vacuum pump 8, where the vacuum pump 8 is connected to the sealed box 1. Wherein, pressure test device includes drive arrangement 6, clamp plate 10 and pressure sensor 5, is equipped with sealed chamber 13 in the sealed box 1, and clamp plate 10, pressure sensor 5 and laminate polymer battery 4 all are located sealed chamber 13. Drive arrangement 6 links to each other with clamp plate 10 and is used for driving clamp plate 10 extrusion laminate polymer battery 4, and when clamp plate 10 extrusion laminate polymer battery 4, pressure sensor 5 contacted with laminate polymer battery 4, pressure sensor 5 is connected and exports the record pressure value with pressure gauge (not shown in the figure) and the computer (not shown) that is located sealed box 1 outside.
As shown in fig. 1, as an embodiment, the driving device 6 may be a rod cylinder, a rodless cylinder, a rack and pinion, a ball screw, or the like, to drive the pressing plate 10 to reciprocate relative to the pouch battery 4, so that the pressing plate 10 can not only press the pouch battery 4, but also be separated from the pouch battery 4 after the airtightness detection is completed. When the air tightness is detected, the vacuum pump 8 is used for vacuumizing the sealed box body 1; after the gas tightness detection is completed, the vacuum pump 8 can discharge the vacuum to the sealed box body 1 again, so that the soft package battery 4 can be conveniently taken out from the sealed box body 1.
As shown in fig. 1, as an embodiment, the sealed box 1 includes an end plate 11 and a cover 12, and the cover 12 is connected with the end plate 11 in an openable and closable manner to accommodate and remove the pouch battery 4. The cover 12 is a box-type structure, and an opening (not numbered) is formed at the bottom of the cover 12, and the end plate 11 is located at the opening and is connected with the cover 12 in a sealing manner.
Specifically, the end plate 11 may be provided on the production line or at a special inspection station, and the pouch cells 4 subjected to the sealing process, which are conveyed by the upstream conveying line, are placed on the end plate 11 for gas-tightness inspection.
As an embodiment, as shown in fig. 1, a sealing assembly 2 is provided at the opening and closing position of the cover cap 12 and the end plate 11. The seal assembly 2 may be a gasket or other sealing structure.
As shown in fig. 1, as an embodiment, the end plate 11 can be lifted up and down relative to the cover 12 (or the cover 12 can be lifted up and down relative to the end plate 11), and the soft-package battery 4 can be moved into and out of the sealed box 1 by lifting the end plate 11. When the air tightness test is carried out, the end plate 11 is lowered and separated from the cover cap 12, the soft package battery 4 is placed on the end plate 11, and then the end plate 11 is lifted to be in sealing connection with the cover cap 12; after the air tightness test is completed, the end plate 11 is lowered again for removal and replacement of the pouch cell 4.
As another embodiment, as shown in fig. 3, the sealed box 1 may also be provided with an opening and closing door 3 for taking in and out the pouch battery 4 (the opening and closing door 3 may be provided on a side wall, a top wall, or an end plate 11 of the cover 12), and the opening and closing door 3 may be opened or closed. When the air tightness test is carried out, the switch door 3 is firstly opened, the soft package battery 4 is placed into the sealed box body 1 from the switch door 3, then the switch door 3 is closed, and attention needs to be paid to the sealing connection between the switch door 3 and the cover cap 12. The number of the opening/closing doors 3 may be two (of course, the number of the opening/closing doors 3 may be one or more), and the two opening/closing doors 3 are respectively located on the left and right sides or the front and rear sides of the cover 12.
As shown in fig. 1, as an embodiment, the pressing plate 10 is directed to the pouch cell 4, and the pressure sensor 5 is located between the pressing plate 10 and the pouch cell 4. Laminate polymer battery 4 keeps flat on end plate 11, and clamp plate 10 is located laminate polymer battery 4's top, and pressure sensor 5 fixes the lower surface at clamp plate 10 and is located between clamp plate 10 and laminate polymer battery 4, and clamp plate 10 can be from last to extruding laminate polymer battery 4 down (the pressure value that pressure sensor 5 measured this moment is the extrusion force between clamp plate 10 and laminate polymer battery 4).
Of course, it may also be that pressure sensor 5 places on end plate 11, laminate battery 4 keeps flat on pressure sensor 5, and clamp plate 10 is located laminate battery 4's top, and clamp plate 10 can be from last to extruding laminate battery 4 down (the pressure value that pressure sensor 5 measured at this moment is the extrusion force between clamp plate 10 and laminate battery 4's gravity sum).
As another embodiment, as shown in fig. 2, a stop block 111 is arranged in the sealed cavity 13, and the stop block 111 is used for fixing or placing the pouch battery 4. Specifically, backstop 111 is vertical to be set up on end plate 11, and laminate polymer battery 4 erects and put on end plate 11, and laminate polymer battery 4's one side and backstop 111 counterbalance lean on, and clamp plate 10 is located laminate polymer battery 4 opposite side. Pressure sensor 5 fixes in the clamp plate 10 and is close to the one side of laminate polymer battery 4, and clamp plate 10 can the side direction (left and right sides direction) extrude laminate polymer battery 4 (the pressure value that pressure sensor 5 surveyed at this moment is the extrusion force between clamp plate 10 and the laminate polymer battery 4).
Of course, also can be that pressure sensor 5 fixes on backstop 111, and laminate polymer battery 4 erects to be put on end plate 11, and one side of laminate polymer battery 4 leans on with pressure sensor 5 counterbalance, and clamp plate 10 is located laminate polymer battery 4 opposite side, and clamp plate 10 can the side direction extrusion laminate polymer battery 4 (the pressure value that pressure sensor 5 measured at this moment is the extrusion force between clamp plate 10 and laminate polymer battery 4).
Of course, it is also possible to place laminate polymer battery 4 on end plate 11, and the quantity of clamp plate 10 is two, and two clamp plates 10 are located laminate polymer battery 4's both sides respectively, and two clamp plates 10 can extrude laminate polymer battery 4 from laminate polymer battery 4's both sides respectively.
As shown in fig. 1, as an embodiment, the driving device 6 is located in the sealed box 1, a bracket 61 is further provided in the sealed box 1, the driving device 6 is connected to the bracket 61, and the bracket 61 is used for fixing the driving device 6. Meanwhile, the bracket 61 can be adjusted up and down to adjust the height of the driving device 6, so that the pressing plate 10 can smoothly press the pouch battery 4. Of course, the driving device 6 may be disposed outside the sealed box 1, and a driving rod (not numbered) on the driving device 6 may extend into the sealed box 1 to be connected to the pressing plate 10.
As an embodiment, the number of the pressure testing devices and the number of the pouch batteries 4 may be multiple (only one is shown in the figure), and the multiple pressure testing devices can simultaneously detect the air tightness of the multiple pouch batteries 4, so as to improve the testing efficiency.
As shown in fig. 1, as an embodiment, the device for detecting the airtightness of the pouch battery further comprises a vacuum pipeline 9, a vacuum pump 8 is connected with the sealed box 1 through the vacuum pipeline 9, and a vacuum gauge 7 is arranged on the vacuum pipeline 9.
As an embodiment, after the sealed box 1 is vacuumized, the vacuum degree in the sealed box 1 is less than or equal to the vacuum degree when the pouch battery 4 is finally sealed in the manufacturing process (if the vacuum degree in the sealed box 1 is greater than the vacuum degree when the pouch battery 4 is sealed, the pouch battery 4 will expand regardless of whether the air tightness of the pouch battery 4 is good, which will not only affect the result of the air tightness test, but also may cause the damage to the pouch battery 4). Specifically, the degree of vacuum in the sealed casing 1 can be controlled by observing the index of the vacuum gauge 7.
Another embodiment of the invention provides a method for detecting the airtightness of a soft-package battery, which is applied to the device for detecting the airtightness of the soft-package battery, and the method for detecting the airtightness of the soft-package battery comprises the following steps:
step one, placing a to-be-detected soft package battery 4 (such as the soft package battery 4 subjected to sealed vacuumizing processing on a production line or the soft package battery 4 returned to a factory for overhaul detection) in a sealed box body 1 (which can be transversely arranged on an end plate 11 or longitudinally arranged on the end plate 11 and abutted against a stop block 111), and ensuring the sealing of the sealed box body 1;
step two, vertically moving or horizontally moving the pressing plate 10 with the pressure sensor 5 to contact the surface of the pouch battery 4 and pressing the pressing plate to form a stable detection initial state (that is, the pressing plate 10 provides a stable pressure value F1 for the pouch battery 4, the specific value of the pressure value F1 is not limited, for example, 1-10N, and the specific value of the pressure value F1 can be determined according to the size of the pouch battery 4 and the size of the driving device 6), and at this time, the pressure display value of the pressure sensor 5 is kept stable;
step three, vacuumizing the interior of the sealed box body 1;
detecting and recording the pressure value change (namely the pressure change value of the pressure sensor 5) between the soft package battery 4 and the pressure plate 10 after vacuumizing, and transmitting the pressure value change to external equipment through the pressure sensor 5 and recording the pressure value change;
and fifthly, judging the air tightness state of the soft package battery according to the pressure change value. The pouch battery 4 in which the magnitude of the pressure variation value is out of the set range is regarded as a defective product with poor airtightness.
Further, the specific judgment standard for classifying the quality of the pouch battery 4 according to the pressure change value is as follows: measured pressure value variable quantity of soft package battery
Belongs to good batteries;
the defective products which are unqualified but can be repaired by seal repairing and reworking are applied to occasions with low requirements;
the method belongs to unqualified products which cannot be repaired and need to be scrapped.
Wherein, the first and the second end of the pipe are connected with each other,
the mean value obtained by averaging the pressure value variation F2 of a certain number of good soft package batteries 4 (the mean value can be calculated by adopting the good battery test values obtained in the previous batches of tests or the test values in the laboratory experiment process); and sigma is the standard deviation of the variation of the pressure value of the batch of good soft package batteries 4 during the test.
Wherein, in order to correspond to different quality and cost control requirements, the value range of A is set to be (2-6); and the value range of B is (A-A + 20), when a batch of single detection is carried out, B is determined after a fixed value is selected in the value range of A, and the fixed value of B is selected in the value range of B and then is applied to a specific judgment standard for detecting the pressure change value of the batch of the soft package batteries 4. The value of A and B is mainly considered for cost control and delivery quality control. For example, if a battery with high quality requirement and high airtight packaging level needs to be delivered, a small value in the value range is taken as the value of a, and the soft package battery 4 with small pressure change (i.e., high airtight packaging level) is selected as a good product. For another example, if the purpose of saving cost and improving utilization rate is achieved and the requirement on delivery quality is not high, a can take a larger value in the range, and meanwhile, the value of B can also be set to be a larger value, so that a large number of soft package batteries can be continuously used as defective goods which can be repaired by repair and rework and applied to occasions with low requirements, and waste caused by direct scrapping is reduced.
If a is less than 2, a value is too close to σ in the determination of airtightness, and a pouch battery that is actually good is likely to be determined to be defective due to excess because of measurement errors. Similarly, if a is greater than 6, the accuracy of the good battery judgment will be affected. The value of B determines the same.
For example: in the present example, the delivery quality requirement was considered comprehensively, and a constant value of A4.5 was set as a value for evaluating good product when the airtightness of the pouch battery was measured,in this case, the value range of B is further determined to be (4.5 to 24.5), and the value of B is set to 15 in consideration of the cost control level. That is, in the present embodiment, the detected amount of change in the pressure value
The good batteries are obtained;
can be repaired into defective goods applied to occasions with low requirements through seal repairing and reworking,
the unqualified products which need to be scrapped cannot be repaired.
The working principle of the soft package battery airtightness detection device in the embodiment is as follows:
1. by utilizing the characteristics that the pressure difference exists between the inside and the outside of the aluminum-plastic film shell of the soft package battery 4 and the aluminum-plastic film is easy to deform, the soft package battery 4 to be detected is sequentially placed in the environment of the sealed cavity 13 which is in two pressure states of negative pressure after normal pressure and vacuumizing, and the pressure change of the soft package battery 4 in the two pressure states is detected by combining the pressure plate 10 with the pressure sensor 5.
2. The soft package battery 4 packaged on the production line is placed in the sealing cavity 13, and the interior of the soft package battery is in a negative pressure state. When the pressure plate 10 with the pressure sensor 5 is pressed down, the pressure plate 10 provides a stable pressure value F1 to clamp the pressure plate 10, and the interaction force between the pouch cell 4 and the pressure sensor 5 in the normal pressure environment is only the clamping force F1 of the pressure plate 10.
3. When the sealed cavity 13 is vacuumized, the soft package battery 4 with good air tightness has no change in volume because the interior of the soft package battery is vacuumized (no gas exists) during production. The soft package battery 4 with poor air tightness has an unsealed channel on the aluminum plastic film, and the interior of the soft package battery is communicated with the external environment through the channel, so that gas exists inside the soft package battery (namely, internal negative pressure leakage). When sealed chamber 13 internal gas pressure changes (during the evacuation, sealed chamber 13 internal gas is taken away fast, takes out the speed of leaking to sealed chamber 13 from the gas in the speed is greater than laminate polymer battery 4), because laminate polymer battery 4 inside gas is less than sealed chamber 13 internal gas and is taken out the speed of separating to sealed chamber 13 internal gas to the speed of leaking in sealed chamber 13 to make laminate polymer battery 4 inside atmospheric pressure be greater than laminate polymer battery 4 external environment (sealed chamber 13 inner space) atmospheric pressure, laminate polymer battery 4 appears the inflation promptly. And because the pressing plate 10 is in a state of pressing the pouch battery 4 tightly, the pressure F2 generated by the expansion of the pouch battery 4 is fed back to the pressing plate 10, the pressure sensor 5 then measures a larger pressure value F3, and the pressure value F2 is obtained by subtracting the pressure value F1 provided by the pressing plate 10 itself from the pressure value F3. The pressure data are transmitted to a receiving device outside the device for reading, and the air tightness of the soft package battery 4 is judged according to the pressure value F2.
In the process of judging the air tightness, two states of good/bad air tightness can be preliminarily judged, namely the soft package battery 4 with poor air tightness is judged if the force F2 exists, and the soft package battery 4 with good air tightness is judged if the force F2 does not exist (namely F2 is approximately equal to 0); and then further judging the air tightness grade of the soft package battery 4 with poor air tightness, and segmenting the numerical value (namely the sealing defect level corresponding to the expansion level) of the pressure value F2 to judge the sealing degree of the soft package battery 4 with relatively poor air tightness, and further judging whether the soft package battery 4 can be repaired and used in occasions with low use requirements or can only be scrapped so as to achieve the purposes of detecting the air tightness of the soft package battery 4 and grading the air tightness state of the soft package battery 4.
The device and the method for detecting the air tightness of the soft package battery solve the problems that in the prior art, the air tightness of the soft package battery is high in detection cost, low in resolution for judging the air tightness state and not suitable for on-line detection. The air tightness detection device has the advantages that: 1. the size change of the soft package battery 4 is not required to be visually observed by a person, the resolution ratio is improved, the detection precision is high, and the classification of the airtight state of the soft package battery 4 can be realized; 2. the efficiency is high, and the air tightness of a plurality of soft package batteries 4 can be detected on line in batches; 3. the soft package battery 4 is not damaged, and the production cost is reduced; 4. simple structure and low equipment cost.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The device for detecting the air tightness of the soft package battery (4) is used for detecting the air tightness of the soft package battery and is characterized by comprising a sealed box body (1), a pressure testing device and a vacuum pump (8), wherein the vacuum pump (8) is connected with the sealed box body (1); the pressure testing device comprises a driving device (6), a pressing plate (10) and a pressure sensor (5), a sealing cavity (13) is formed in the sealing box body (1), the pressing plate (10) and the pressure sensor (5) are both located in the sealing cavity (13), and the driving device (6) is connected with the pressing plate (10) and used for driving the pressing plate (10) to extrude the soft package battery (4); the clamp plate (10) extrudees during laminate polymer battery (4), pressure sensor (5) with laminate polymer battery (4) contact.
2. The laminate battery airtightness detection device according to claim 1, wherein the sealed box body (1) comprises an end plate (11) and a cover (12), and the cover (12) is connected with the end plate (11) in an openable and closable manner so as to allow the laminate battery (4) to be put in and taken out.
3. The laminate battery airtightness detection device according to claim 2, wherein a sealing assembly (2) is provided at the opening and closing position of the cover (12) and the end plate (11).
4. The laminate battery airtightness detection device according to claim 1, wherein the sealed box body (1) is provided with an opening and closing door (3) for putting in and taking out the laminate battery (4), and the opening and closing door (3) can be opened or closed.
5. The pouch cell airtightness detection apparatus according to claim 1, wherein the pressure plate (10) is directed to the pouch cell (4), and the pressure sensor (5) is located between the pressure plate (10) and the pouch cell (4).
6. The laminate battery airtightness detection device according to claim 1, wherein a stop block (111) is arranged in the sealed cavity (13), and the stop block (111) is used for fixing or placing the laminate battery (4).
7. The laminate battery airtightness detection device according to claim 1, wherein the driving device (6) is located in the sealed box body (1), a support (61) is further arranged in the sealed box body (1), the driving device (6) is connected with the support (61), and the support (61) is used for fixing the driving device (6).
8. The laminate polymer battery airtightness detection device according to claim 1, wherein the number of the pressure test device and the number of the laminate polymer batteries (4) are both plural, and the plural pressure test devices can simultaneously detect the airtightness of the plural laminate polymer batteries (4).
9. The pouch battery airtightness detection apparatus according to claim 1, wherein the vacuum pump (8) is configured to evacuate the sealed box body (1), and after evacuation of the sealed box body (1), a vacuum degree in the sealed box body (1) is less than or equal to a vacuum degree of the pouch battery (4) during sealing in a manufacturing process.
10. The method for detecting the air tightness of the soft package battery is applied to the device for detecting the air tightness of the soft package battery according to any one of claims 1 to 9, and comprises the following steps:
step one, placing a soft package battery (4) in a sealed box body (1), and sealing the sealed box body (1);
pressing a pressing plate (10) to be in contact with the surface of the soft package battery (4) and tightly pressing the pressing plate until a stable detection initial state is formed, wherein the pressure display value of the pressure sensor (5) is kept stable;
step three, vacuumizing the interior of the sealed box body (1);
detecting and recording a pressure change value of the pressure sensor (5) after vacuumizing, and transmitting the pressure change value to external equipment through the pressure sensor (5) and recording the pressure change value;
and step five, judging the air tightness state of the soft package battery (4) according to the pressure change value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110745645.8A CN115541145A (en) | 2021-06-30 | 2021-06-30 | Soft package battery air tightness detection device and detection method |
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| CN202110745645.8A CN115541145A (en) | 2021-06-30 | 2021-06-30 | Soft package battery air tightness detection device and detection method |
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| CN115541145A true CN115541145A (en) | 2022-12-30 |
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| CN202110745645.8A Pending CN115541145A (en) | 2021-06-30 | 2021-06-30 | Soft package battery air tightness detection device and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116754142A (en) * | 2023-08-12 | 2023-09-15 | 深圳市惠华欣电池科技有限公司 | Soft package battery packaging detection device |
| CN117091772A (en) * | 2023-10-17 | 2023-11-21 | 宁德时代新能源科技股份有限公司 | Air tightness detection method and air tightness detection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116754142A (en) * | 2023-08-12 | 2023-09-15 | 深圳市惠华欣电池科技有限公司 | Soft package battery packaging detection device |
| CN116754142B (en) * | 2023-08-12 | 2023-11-03 | 深圳市惠华欣电池科技有限公司 | Soft package battery packaging detection device |
| CN117091772A (en) * | 2023-10-17 | 2023-11-21 | 宁德时代新能源科技股份有限公司 | Air tightness detection method and air tightness detection system |
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