A device and method for visualizing the air tightness of a lithium battery structural member

Abstract

The application discloses a kind of for lithium battery structural member visual air tightness detection equipment and detection analysis method, the equipment includes: feeding assembly is used to transfer battery cover to monitoring area;Detection component includes at least two groups of detector and relative to each described detector's receiver;Two described detectors are vertically arranged, and for detecting the cross section and longitudinal section at corresponding seal on battery cover;The receiver is configured to obtain the density of each component on cross section and longitudinal section;Master control component includes rendering module and display module, the rendering module is respectively connected with receiver, display module, and is used to render the density map of each component obtained by receiver, and is shown by display module;The present application provides visual air tightness detection equipment and detection analysis method, which solves the problem of low efficiency, high cost and low detection accuracy of existing battery cover air tightness detection.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing, and in particular to a visual airtightness testing device and testing and analysis method for lithium battery structural components. Background Technology

[0002] As one of the green and clean energy sources, lithium batteries are facing fierce competition for a larger market share, driven by the rapid development of the automotive power and energy storage industries, especially given the current focus on cost reduction and efficiency improvement in new energy.

[0003] Traditional methods for testing the airtightness of lithium battery structural components, especially the seal between the electrodes and the cover of the battery, rely on helium molecule detection instruments. Specifically, this method depends entirely on the helium molecules drawn in by a molecular pump, using a corresponding surface sensor to detect the amount of helium and determine if a leak exists. However, this method is prone to misjudgments and inaccuracies, ultimately leading to defective products entering the market. More seriously, the inspected products cannot be traced, making it difficult to track and recover them after quality issues arise. Furthermore, existing testing methods are costly, requiring expensive consumables; testing a single battery cover costs 0.1 to 0.4 yuan in nitrogen. Additionally, residual nitrogen in the battery cover can easily come into contact with the electrolyte inside the battery compartment (nitrogen cannot come into contact with electrolyte, as this can cause a reaction and potentially ignite). Finally, the sealed structure of the battery cover is invisible after encapsulation, making it difficult to detect localized leaks; existing airtightness testing methods cannot observe the overall condition.

[0004] In summary, existing airtightness testing methods are insufficient to meet the demands of production, safety, and environmental protection. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned defects or problems in the background art and provide a visual airtightness testing device and testing and analysis method for lithium battery structural components. It has a simple structure, is easy to operate and implement, and solves the problems of low efficiency, high cost, need to fill with nitrogen before each test, and low detection accuracy of existing battery cover airtightness testing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A visual airtightness testing device for lithium battery structural components, the device comprising:

[0008] A layout assembly for arranging battery covers with seals at intervals and for placing the battery covers vertically.

[0009] A feeding assembly for transferring the battery cover to the monitoring area;

[0010] a detection assembly comprising at least two groups of detectors and receivers relative to each of the detectors; the two detectors are arranged perpendicular to each other and used for detecting the cross section and longitudinal section of the corresponding seal on the battery cover; the receivers are configured to obtain the density of each component on the cross section and longitudinal section;

[0011] a main control assembly comprising a rendering module and a display module, the rendering module is electrically connected with the receivers and the display module respectively and used for rendering the density map of each component obtained by the receivers and displaying through the display module;

[0012] a feeding assembly used for placing or stacking the battery cover in the monitoring area to the designated area.

[0013] Further, the cross section shape of the seal is in the shape of a single line or L.

[0014] Further, the feeding assembly comprises a feeding bin, a transmission table and a transfer structure, the feeding bin is suspended above the transmission table and places the battery cover vertically to the table top of the transmission table; the transmission table is driven by a driving assembly to reciprocate towards the monitoring area; the transfer structure transfers the vertically placed battery cover to the limiting seat of the monitoring area by the vacuum suction accessory and makes the cross section and longitudinal section of the battery cover correspond to the two detectors and receivers respectively.

[0015] Further, the driving assembly comprises a sliding seat, a sliding rail, a screw rod and a servo motor, the sliding seat is screwed with the screw rod and forms linear displacement by the limiting of the sliding rail, the servo motor is connected with one end of the screw rod to drive the screw rod to rotate; wherein, the transmission table is locked on the sliding seat to make the transmission table translate axially along the screw rod for feeding.

[0016] Further, the detector is configured as an X-ray perspective scanner.

[0017] A method for visualizing the air tightness detection of lithium battery structure, the detection method is based on the visualizing air tightness detection device; further comprising:

[0018] the battery cover is scanned by the detector, the cross section and longitudinal section images of the battery cover in the vertical placement state are obtained by the receiver, the collected images are stored, compared and rendered into a density map;

[0019] the density map is processed by gray scale to form a contour map, and the image of the corresponding seal and the battery cover body is matched by the color difference set by human being;

[0020] the contour images of the seal in the cross section and longitudinal section are collected, stored and compared at every interval of the first interval set by human being, and the absolute value of the interval between the upper and lower surfaces of the seal is greater than the first value set by human being and less than the second value set by human being.

[0021] The first artificial set value is defined as the value obtained by multiplying the difference between the measured values of the upper and lower surfaces of the seal in the original state of the seal by 80%;

[0022] The second artificial set value is defined as the value obtained by multiplying the difference between the measured values of the upper and lower surfaces of the seal in the original state of the seal by 70%.

[0023] Further, the collection, storage and comparison are performed within the artificial set second interval along the cross-sectional direction of the battery cover and from the corner position of the seal to the free end.

[0024] Further, in the artificial set first interval, if the absolute value of the current collected interval is greater than the absolute value of the last collected interval by more than the artificial set threshold value, it is determined to be unqualified.

[0025] From the above description of the present application, the present application has the following beneficial effects compared with the prior art:

[0026] The present application provides a kind of for lithium battery structural member visual gas tightness detection equipment and detection analysis method, it is simple in structure, easy to operate and easy to realize, it solves the problems of low detection efficiency, high cost, needs to fill nitrogen after each detection and low detection precision of existing battery cover gas tightness;The present application breaks the various drawbacks of traditional helium detection, adopts a visual detection method to determine its sealing performance, not only high detection efficiency, low cost, without using consumables (nitrogen) and higher precision, more importantly, battery cover after detection can be marked, subsequent flow into market can also trace its entire detection process;In addition, the process is reduced, and the processing safety is further improved, without considering the discharge of helium, etc., energy saving and emission reduction effect, little impact on the environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1 It is a perspective exploded view of the battery cover described in the present application.

[0029] Figure 2 It is a sectional view of the battery cover described in the present application.

[0030] Figure 3 It is a top view of the detection device described in the present application.

[0031] Figure 4 Front view of the detection device according to the present application;

[0032] Figure 5 Schematic perspective view of the feeding assembly according to the present application;

[0033] Figure 6 Sectional view of the sealing member according to the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are the preferred embodiments of the present application, and should not be regarded as exclusive to other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0035] In the claims, the specification, and the above drawings of the present application, unless otherwise clearly limited, the use of the terms "first", "second", or "third" are not to be construed as limiting the features to which they refer to particular orders or sequences.

[0036] In the claims, the specification, and the above drawings of the present application, unless otherwise clearly limited, the use of the terms "first", "second", or "third" are not to be construed as limiting the features to which they refer to particular orders or sequences.

[0037] In the claims, the specification, and the above drawings of the present application, unless otherwise clearly limited, the use of the terms "first", "second", or "third" are not to be construed as limiting the features to which they refer to particular orders or sequences.

[0038] In the claims, the specification, and the above drawings of the present application, unless otherwise clearly limited, the use of the terms "first", "second", or "third" are not to be construed as limiting the features to which they refer to particular orders or sequences.

[0039] Reference Figures 1-5The application discloses a visual air tightness detection equipment for a lithium battery structure, which is used for automatically conveying a battery cover 3 to a monitoring area 51 for detection and determining whether a sealing element 2 on the battery cover 3 is in a sealed state.

[0040] The visual air tightness detection equipment comprises:

[0041] A distribution assembly is arranged for spacing and vertically placing the battery cover 3 with the sealing element 2 (the cross-sectional shape of the sealing element 2 is in a character type or an L type);

[0042] A feeding assembly 4 is arranged for transferring the battery cover 3 to the monitoring area 51; in the application, the feeding assembly 4 comprises a feeding bin 41, a transmission table 42 and a transfer structure 43, the feeding bin 41 is suspended above the transmission table 42 and vertically places the battery cover 3 on the surface of the transmission table 42; the transmission table 42 is driven to reciprocally displace towards the monitoring area 51 by a driving assembly (it is to be noted that the motor lead screw is taken as an example of the driving assembly in the application, and other modes such as a pneumatic cylinder and a hydraulic cylinder can also be used; the driving assembly 45 comprises a sliding base 451, a sliding rail 452, a lead screw 453 and a servo motor 454, the sliding base 451 is screwed with the lead screw 453 and is linearly displaced by the sliding rail 452, the servo motor 454 is rotationally connected with one end of the lead screw 453 to drive the lead screw 453 to rotate; the transmission table is locked on the sliding base 451 to make the transmission table 42 axially translate to feed);

[0043] The transfer structure 43 (which is a three-axis transmission structure and is not described in detail as it is a prior art) transfers the vertically placed battery cover 3 to the limiting seat 511 of the monitoring area 51 by a vacuum suction member 46 and makes the cross section and the longitudinal section of the battery cover 3 correspond to two detectors 61 and a receiver 62 respectively;

[0044] A detection assembly 6 comprises at least two groups of detectors 61 (in the application, the detector 61 is taken as an example of an X-ray perspective scanner, and the model is BJI-G) and receivers 62 corresponding to the detectors 61; the two detectors 61 are vertically arranged and are used for detecting the cross section and the longitudinal section of the corresponding sealing element 2 on the battery cover 3; the receiver 62 is configured to obtain the density of each component on the cross section and the longitudinal section;

[0045] A main control assembly 7 comprises a rendering module 71 and a display module 72, the rendering module 71 is electrically connected with the receiver 62 and the display module 72 and is used for rendering the density diagram of each component obtained by the receiver 62 and displaying the density diagram by the display module 72;

[0046] A blanking assembly is used to transfer the battery cover 3 of the monitoring area 51 to the designated area to be placed or stacked.

[0047] DETAILED DESCRIPTION, REFERENCE IS MADE TO Figures 1-5 The application discloses a kind of equipment for visualizing airtightness detection of lithium battery structural member, mainly includes the following components: arrangement assembly 1, sealing element 2, battery cover 3, rack 5, blanking bin 41, transmission table 42, transfer structure 43, sliding seat 451, slide rail 452, screw rod 453, servo motor 454, vacuum suction accessory 46, X-ray perspective scanner 61, receiver 62, imaging module 71, display module 72 and blanking assembly 8;

[0048] Actual assembly and detection:

[0049] (1) three areas are separately arranged on the rack 5, corresponding to the feeding area 52, the monitoring area 51 and the blanking area 53; wherein feeding assembly 4 is arranged on the feeding area 52; transfer structure 43 and vacuum suction accessory 46 are arranged between the feeding area 52 and the monitoring area 51; the monitoring area 51 is respectively provided with X-ray perspective scanner 61, receiver 62 and main control assembly 7; the arrangement assembly 1 is arranged near the feeding area 52, and the battery cover 3 with the sealing element 2 arranged thereon is placed in the blanking bin 41 by manual; the blanking assembly 8 is located in the blanking area 53, and the detected product is manually or transferred by the transfer structure 43 to the corresponding position;

[0050] (2) feeding assembly 4 is arranged, and after the slide rail 452 is arranged and fixed on the rack 5, the sliding seat 451 screwed with the screw rod 453 is arranged corresponding to the slide rail 452, so that it can only slide along the slide rail 452, and the both ends of the screw rod 453 are fixed on the rack 5 through bearings, so that the screw rod 453 can only rotate circumferentially and cannot linearly displace; then the servo motor 454 is connected with one end of the screw rod 453 to prevent rotation, so that the servo motor 454 drives the screw rod 453 to rotate, and the sliding seat 451 on the screw rod 453 linearly displaces along the slide rail 452; finally, the transmission table 42 is fixed on the sliding seat 451, to realize the linear feeding of the transmission table 42;

[0051] (3) detection assembly 6 and main control assembly 7 are arranged, the detection assembly 6 includes two groups of detectors 61 (i.e. X-ray perspective scanner) and two groups of receivers 62, one group is arranged up and down along the height direction of the rack 5, and the other group is arranged along the front and back directions; the main control assembly 7 includes imaging module 71 and display module 72, the display module 72 is a display screen, and the detected image is presented through the display screen;

[0052] Actual detection,

[0053] A kind of visual gas tightness detection method for lithium battery structure, which is based on the visual gas tightness detection equipment described in the application;

[0054] (1) by artificial battery cover 3 on the arrangement component 1 (i.e. movable shelf) is installed to blank bin 41, by the slope in blank bin 41 Sliding to transmission platform 42, at this time by servo motor 454 work, drive screw rod 453 rotation, linkage with the threaded sliding seat 451 along screw rod 453 and slide rail 452 linear displacement, further move transmission platform 42 on sliding seat 451 to the position that transfer structure 43 can be grabbed, again by vacuum suction accessory 46 battery cover 3 is transferred and placed in monitoring area 51;

[0055] (2) refer to Figure 6 , by detector 61 scanning battery cover 3, and by receiver 62 obtains the cross section, longitudinal section image of the battery cover 3 in vertical placement state, the image collected is stored, compared, and the density map is presented;

[0056] After gray processing of the density map, the contour map is formed, and the image of the corresponding sealing member 2 and battery cover 3 body is matched with the color difference set by human being;

[0057] Every interval human being sets first interval A to collect, store and compare the contour image of sealing member 2 in cross section and longitudinal section (such as every interval human being sets first interval A to 0.05 or 1 mm to collect, store and compare to illustrate), and the absolute value H (if several H1, H2, H3.... Hn) between the upper and lower surfaces of sealing member 2 is greater than the first value B set by human being, and less than the second value C set by human being;That is, the absolute value H of the interval between the upper and lower surfaces of sealing member 2 at this position is collected, and the absolute value H of the difference between the coordinate value of the upper surface and the coordinate value of the lower surface at the collection position is collected, and the absolute value H of the interval is used to judge the deformation amount of sealing member 2;Subsequently, the absolute value H of the interval needs to meet the following two conditions;That is, greater than the first value B set by human being, and less than the second value C set by human being;Herein:

[0058] The first value B set by human being is defined as the difference between the measured values of the upper and lower surfaces of sealing member 2 in the original state, multiplied by 80% to obtain the value;For example, the difference between the upper and lower surfaces of sealing member 2 in the original state is 2 mm, multiplied by 80% to obtain the value of 1.6 mm;When the absolute value H of the interval after detection is greater than 1.6 mm, it is determined that the product is unqualified, which means that the elastic deformation amount of the sealing member 2 is too small, and the sealing performance is unqualified;

[0059] The second value C set by the human is defined as the difference between the measured values of the upper and lower surfaces of the sealing member 2 in the original state of the sealing member 2 multiplied by 70%; for example, the difference between the measured values of the upper and lower surfaces of the sealing member 2 in the original state is 2 mm, and the value obtained by multiplying 70% is 1.4 mm; when the absolute value H of the detected interval is less than 1.4 mm or greater than 1.6 mm, it is determined to be an unqualified product;

[0060] In addition, in the first interval number N set by the human, if the absolute value H of the interval collected this time is greater than the threshold value set by the human compared to the absolute value H of the interval collected last time, it is determined to be unqualified; that is, for example, in the consecutive first interval number N set by the human (such as N = 5 times), the collected example this time is 1.59 mm, and the absolute value H of the interval collected last time is 1.4 mm, the difference between them exceeds 1.5 mm, and it is also determined to be unqualified;

[0061] Furthermore, the collection, storage and comparison are carried out in the second interval M set by the human along the cross-sectional direction of the battery cover 3 and from the free end to the outside, and the detection accuracy is higher.

[0062] The present application provides a kind of for lithium battery structure member visual gas tightness detection equipment and detection analysis method, it is simple in structure, easy to operate and easy to realize, it solves the problems of low detection efficiency, high cost, nitrogen needs to be filled in each time before detection and low detection precision of existing battery cover gas tightness;The present application breaks the various disadvantages of traditional helium detection, adopts a kind of visual detection method to determine its sealing performance, not only high detection efficiency, low cost, without using consumables (nitrogen) and higher precision, more importantly, battery cover after detection can be marked, subsequent flow into market can also trace its entire detection process;In addition, the process amplitude is reduced, and the processing safety is further improved, without considering the discharge of helium, etc., play the effect of energy saving and emission reduction, and the influence on environment is small.

[0063] The above description of the specification and examples is used to explain the scope of protection of the present application, but does not constitute a limitation on the scope of protection of the present application.

Claims

1. A visual airtightness testing device for lithium battery structural components, characterized in that: The device includes: A layout assembly for arranging battery covers with seals at intervals and for placing the battery covers vertically. A feeding assembly for transferring the battery cover to the monitoring area; A detection assembly includes at least two sets of detectors and a receiver relative to each of the detectors; both sets of detectors are configured as X-ray scanning scanners; the two detectors are arranged perpendicularly to each other and are used to detect the cross-section and longitudinal section of the battery cover at the corresponding seal; the receiver is configured to acquire the density of each component on the cross-section and longitudinal section. The main control component includes an imaging module and a display module. The imaging module is electrically connected to the receiver and the display module, respectively, and is used to image the density map of each component acquired by the receiver and display it through the display module. The unloading assembly is used to transfer the battery covers in the monitoring area to a designated area for placement or stacking.

2. The visual airtightness testing device for lithium battery structural components as described in claim 1, characterized in that: The cross-sectional shape of the seal is either straight or L-shaped.

3. The visual airtightness testing device for lithium battery structural components as described in claim 2, characterized in that: The feeding assembly includes a feeding bin, a transmission table, and a transfer structure. The feeding bin is suspended above the transmission table and places the battery cover perpendicular to the table surface. The transmission table is driven by a drive assembly to move back and forth toward the monitoring area. The transfer structure uses a vacuum suction component to transfer the vertically placed battery cover to the limiting seat in the monitoring area, and makes the cross-section and longitudinal section of the battery cover correspond to the two detectors and the receiver, respectively.

4. The visual airtightness testing device for lithium battery structural components as described in claim 3, characterized in that: The drive assembly includes a slide block, a slide rail, a lead screw, and a servo motor. The slide block is screwed to the lead screw and is limited by the slide rail to form linear displacement. The servo motor is connected to one end of the lead screw in a non-rotating manner to drive the lead screw to rotate. The transmission table is locked on the slide block to allow the transmission table to move and feed material along the axial direction of the lead screw.

5. The visual airtightness testing device for lithium battery structural components as described in claim 3, characterized in that: The detector is configured as an X-ray transillumination scanner.

6. A method for visually inspecting the airtightness of lithium battery structural components, characterized in that: The detection method is based on the visual airtightness detection device as described in claims 1 to 5; and further includes: The detector scans the battery cover, and the receiver acquires cross-sectional and longitudinal images of the battery cover in a vertically placed state. The acquired images are stored, compared, and a density map is generated. After grayscale processing of the density map, a contour map is formed, and the corresponding images of the seal and battery cover body are matched with the color difference set by the user. At each manually set first interval, the contour images of the seal in the cross section and longitudinal section are collected, stored and compared, and the absolute value of the distance between the upper and lower surfaces of the seal is greater than the manually set first value and less than the manually set second value. The first value set by this person is defined as the value obtained by multiplying the difference between the measured values ​​between the upper and lower surfaces of the seal in its original state by 80%. The second value, which is set by the user, is defined as the value obtained by multiplying the difference between the measured values ​​between the upper and lower surfaces of the seal in its original state by 70%.

7. The method for visually inspecting the airtightness of lithium battery structural components as described in claim 6, characterized in that: Data is collected, stored, and compared within a manually set second gap along the cross-sectional direction of the battery cover and from the corner of the seal towards the free end.

8. A method for visually inspecting the airtightness of lithium battery structural components as described in claim 6 or 7, characterized in that: If, within the first set interval of data collection, the absolute value of the interval collected in this instance is greater than the absolute value of the interval collected in the previous instance, it is deemed unqualified.

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