Detection method and detection device for penetration depth of welding seam and battery production line

Abstract

The invention relates to the technical field of batteries, in particular to a weld penetration detection method and device and a battery production line. The weld penetration depth detection method comprises the following steps: acquiring images of at least part of a weld of a sealing nail and a top cover plate; obtaining appearance parameters of a welding seam in the image; the weld penetration depth is determined according to the appearance parameters; and determining that the weld penetration is qualified according to the condition that the weld penetration meets a preset condition. According to the technical scheme, the images of at least part of welding seams of the sealing nail and the top cover plate are collected, the appearance parameters of the welding seams in the images are obtained, the penetration depth of the welding seams is determined according to the appearance parameters, and the penetration depth of the welding seams is determined to be qualified according to the fact that the penetration depth of the welding seams meets the preset conditions. Therefore, the weld penetration can be detected through the appearance parameters of the weld, the weld does not need to be cut, the quality of the weld is judged, the weld penetration can be rapidly detected, and the detection efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method for detecting the penetration depth of a weld, a detection device, and a battery production line. Background Art

[0002] As new energy technologies become increasingly mature, new energy vehicles and other electrical equipment are gradually entering the public eye. The core technology of new energy vehicles lies in the battery device, and the safety and stability of the battery device directly determine the performance of the entire vehicle.

[0003] Battery devices usually seal the liquid injection port by welding with sealing pins. After welding the sealing pins, the welding quality needs to be tested to screen out unqualified products. When testing the penetration depth of the weld, it is usually obtained by metallographic method, but this method is time-consuming and inefficient. Therefore, a more efficient method is needed to detect the penetration depth of the weld. Summary of the invention

[0004] In view of the above problems, the present application proposes a method, device, electrical equipment and storage medium for detecting the penetration depth of a weld to solve the problem of low efficiency in detecting the penetration depth of a weld in the prior art.

[0005] The first aspect of the present application provides a method for detecting the penetration depth of a weld, comprising: capturing an image of at least a portion of a weld between the sealing pin and the top cover plate; Obtain appearance parameters of the weld in the image; Determine the penetration depth of the weld based on the appearance parameters; The penetration depth of the weld is determined to be qualified based on the fact that the penetration depth of the weld meets the preset conditions.

[0006] In the technical solution of the embodiment of the present application, by collecting an image of at least a portion of the weld between the sealing pin and the top cover plate, the appearance parameters of the weld in the image are obtained, and the penetration depth of the weld is determined according to the appearance parameters. The penetration depth of the weld satisfies preset conditions and is determined to be qualified. The penetration depth of the weld can be detected by the appearance parameters of the weld, and there is no need to cut the weld, so the quality of the weld can be judged, which improves the rapid detection of the penetration depth of the weld and improves the detection efficiency.

[0007] In some embodiments, the weld includes scales; obtaining the appearance parameters of the weld in the image includes obtaining the detection size of the scales along a first direction, the detection size of the scales along a second direction, and the detection number of fingerprints of the scales, wherein the first direction is the welding direction of the weld, and the second direction is the depth direction of the weld.

[0008] The embodiments of the present application acquire the appearance parameters of the weld in the image, including acquiring the detection size of the scale along the first direction, the detection size of the scale along the second direction and the detection number of the fingerprints of the scales. Then, the penetration depth of the weld can be predicted by the detection size of the scale along the first direction, the detection size of the scale along the second direction and the detection number of the fingerprints of the scales, thereby achieving accurate prediction of the penetration depth of the weld.

[0009] In some embodiments, determining the penetration depth of the weld based on appearance parameters includes determining the penetration depth of the weld based on the detection size of the scale along the first direction, the detection size of the scale along the second direction, the detection number of fingerprints of the scale, a first weight ratio of the detection size of the scale along the first direction, a second weight ratio of the detection size of the scale along the second direction, and a third weight ratio of the detection number of fingerprints of the scale.

[0010] The embodiments of the present application determine the penetration depth of the weld based on the detection size of the scale along the first direction, the detection size of the scale along the second direction and the detected number of scale fingerprints, as well as a first weight ratio of the detection size of the scale along the first direction, a second weight ratio of the detection size of the scale along the second direction and a third weight ratio of the detected number of scale fingerprints. The penetration depth of the weld can be further accurately predicted based on the weight ratio of the detection size of the scale along the first direction, the detection size of the scale along the second direction and the detected number of scale fingerprints, thereby improving the accuracy of detection of the penetration depth of the weld.

[0011] In some embodiments, acquiring the appearance parameters of the weld in the image further includes acquiring the detection size of the scale along a third direction, wherein the third direction intersects with the first direction and the second direction respectively.

[0012] In the embodiment of the present application, by including the appearance parameters of the weld also including the detection size of the scale along the third direction, the factors affecting the penetration depth of the weld can be further increased, and the penetration depth of the weld can be predicted more accurately.

[0013] In some embodiments, determining the penetration depth of the weld according to the appearance parameters also includes determining the penetration depth of the weld according to the detection size of the scale along the third direction and a fourth weight ratio of the detection size of the scale along the third direction.

[0014] The embodiments of the present application determine the penetration depth of the weld according to the detection size of the scale along the third direction and the fourth weight ratio of the detection size of the scale along the third direction. Then, accurate detection of the penetration depth of the weld can be achieved based on the detection size of the scale along the first direction, the detection size of the scale along the second direction, the detection number of fingerprints of the scale, the detection size of the scale along the third direction, the first weight ratio of the detection size of the scale along the first direction, the second weight ratio of the detection size of the scale along the second direction, the third weight ratio of the detection number of fingerprints of the scale and the fourth weight ratio of the detection size of the scale along the third direction, thereby improving the accuracy of the judgment of the welding quality of the sealing nails of the battery device.

[0015] In some embodiments, the formula for determining the penetration of the weld is: ; Where X is the penetration depth of the weld, K1 is the first weight ratio of the size of the scale along the first direction, H 标 H is the standard size of the scale along the first direction when the weld is at the standard penetration depth. 测 is the detection size of the scale along the first direction, K2 is the second weight ratio of the detection size of the scale along the second direction, and D 标 D is the standard size of the scale along the second direction when the weld is at standard penetration depth. 测 is the detection size of the scale along the second direction, K3 is the third weight ratio of the detection number of the fingerprint of the scale, S 标 S is the standard number of fingerprints of the weld flakes when the weld is at standard penetration depth. 测 is the number of fingerprints detected on the scales, K4 is the fourth weight proportion of the detection size of the scales along the third direction, W 标 W is the standard size of the scale along the third direction when the weld is at standard penetration depth. 测 It is the detection size of the scale along the third direction.

[0016] This application introduces the formula of weld penetration depth , the penetration depth of the weld can be accurately calculated based on these appearance parameters and the corresponding weight ratios, thereby achieving accurate detection of the penetration depth of the weld.

[0017] In some embodiments, capturing an image of at least a portion of the weld between the sealing pin and the top cover plate includes capturing a first image of at least a portion of the weld between the sealing pin and the top cover plate from a first perspective; capturing a second image of at least a portion of the weld between the sealing pin and the top cover plate from a second perspective; wherein the first perspective and the second perspective intersect.

[0018] In an embodiment of the present application, a first image of at least a portion of the weld between the sealing nail and the top cover plate is captured from a first viewing angle, and a second image of at least a portion of the weld between the sealing nail and the top cover plate is captured from a second viewing angle; wherein the first viewing angle and the second viewing angle intersect, and it is convenient to capture images of at least a portion of the weld from at least two angles, thereby facilitating the acquisition of the appearance parameters of the weld.

[0019] In some embodiments, at least a portion of the second image is a state where the first image is in a second viewing angle.

[0020] In the embodiment of the present application, by setting at least a portion of the second image to be a state where the first image is in a second viewing angle, the first image and the second image of the same portion of the weld between the sealing pin and the top cover plate can be used, thereby obtaining appearance parameters of the same portion of the weld and improving the accuracy of detecting the penetration depth of the weld.

[0021] In some embodiments, based on the weld penetration satisfying preset conditions, determining whether the weld penetration is qualified specifically includes judging whether the weld penetration is greater than or equal to a first preset value. If so, the weld penetration is determined to be qualified; if not, the weld penetration is determined to be unqualified.

[0022] The embodiment of the present application determines whether the penetration of the weld is greater than or equal to a first preset value. If so, it is determined that the penetration of the weld is qualified; if not, it is determined that the penetration of the weld is unqualified. The welding quality of the weld can be judged based on the relationship between the detected penetration of the weld and the first preset value, and unqualified battery devices can be screened out, thereby reducing the probability of batch abnormalities in battery devices and reducing the production cost of battery devices.

[0023] Beneficial effects of the embodiments of the present application: The embodiments of the present application capture an image of at least a portion of the weld between the sealing pin and the top cover plate, obtain the appearance parameters of the weld in the image, determine the penetration depth of the weld based on the appearance parameters, and determine that the penetration depth of the weld satisfies preset conditions. The penetration depth of the weld can be detected by the appearance parameters of the weld, and the quality of the weld can be judged without cutting the weld, thereby improving the rapid detection of the penetration depth of the weld and improving the detection efficiency.

[0024] A second aspect of an embodiment of the present application provides a device for detecting the penetration depth of a weld, the device comprising: A collection module, used to collect an image of at least a portion of a weld between the sealing pin and the top cover plate; An acquisition module, used for acquiring appearance parameters of the weld in the image; A first determination module is used to determine the penetration depth of the weld according to the appearance parameters; The second determination module is used to determine whether the penetration of the weld is qualified according to whether the penetration of the weld meets the preset conditions.

[0025] A third aspect of an embodiment of the present application proposes a battery production line, which includes the device for detecting the penetration depth of a weld mentioned above.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 The present invention is a flow chart of an embodiment of a method for detecting the penetration depth of a weld according to an exemplary embodiment; Figure 2 is a schematic diagram of a first image after welding a sealing nail and a top cover plate according to an exemplary embodiment; Figure 3 is a schematic diagram of a second image after a sealing nail and a top cover plate are welded according to an exemplary embodiment; Figure 4 is a schematic diagram showing a cross section of a scale after a sealing nail and a top cover plate are welded according to an exemplary embodiment; Figure 5 It is a schematic structural diagram of a device for detecting the penetration depth of a weld according to an exemplary embodiment.

[0028] Description of reference numerals: 10. Top cover plate; 20. Sealing nails; 30. weld; 31. scale; 40. Detection device; 41. Collection module; 42. Acquisition module; 43. First determination module; 44. Second determination module; H 测 is the detection size of the scale along the first direction; D 测 is the detection size of the scale along the second direction; W 测 is the detection dimension of the scale along the third direction; L is the penetration depth of the weld; XX, first direction; YY, second direction; ZZ, third direction. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electrical equipment, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0036] Battery devices usually seal the liquid injection port by welding with sealing pins. After welding the sealing pins, the welding quality needs to be tested to screen out unqualified products. When testing the penetration depth of the weld, it is usually obtained by metallographic method, but this method is time-consuming and inefficient. Therefore, a more efficient method is needed to detect the penetration depth of the weld.

[0037] In order to solve this technical problem, an embodiment of the present application proposes a method for detecting the penetration depth of a weld, including collecting an image of at least a portion of a weld between a sealing pin and a top cover plate; obtaining the appearance parameters of the weld in the image; determining the penetration depth of the weld based on the appearance parameters; and determining that the penetration depth of the weld is qualified based on the penetration depth of the weld meeting preset conditions. The embodiment of the present application collects an image of at least a portion of a weld between a sealing pin and a top cover plate, obtains the appearance parameters of the weld in the image, determines the penetration depth of the weld based on the appearance parameters, and determines that the penetration depth of the weld is qualified based on the penetration depth of the weld meeting preset conditions. The penetration depth of the weld can be detected by the appearance parameters of the weld, without cutting the weld, so as to achieve judgment of the quality of the weld, thereby improving rapid detection of the penetration depth of the weld and improving detection efficiency.

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0039] like Figure 1 As shown, Figure 1 The flowchart of an embodiment of a method for detecting the penetration depth of a weld 30 according to an exemplary embodiment is shown. The method for detecting the penetration depth of the weld 30 includes: S11 , capturing an image of at least a portion of the weld 30 after the sealing pin 20 and the top cover plate 10 are welded.

[0040] S12, obtaining appearance parameters of the weld 30 in the image.

[0041] S13, determining the penetration depth of the weld 30 according to the appearance parameters.

[0042] S14, determining that the penetration depth of the weld 30 is qualified based on whether the penetration depth of the weld 30 meets a preset condition.

[0043] In S11, capturing an image of at least a portion of the weld 30 after the sealing pin 20 and the top cover plate 10 are welded may be capturing an image of the entire weld 30 after the sealing pin 20 and the top cover plate 10 are welded, or capturing an image of a portion of the weld 30 after the sealing pin 20 is welded. Here, it is assumed that the weld 30 is evenly distributed at different positions, and the partial image of the weld 30 can be used to obtain the appearance parameters of the weld 30, wherein the image here includes at least two pictures, which are obtained by shooting from at least two different viewing angles.

[0044] In S12, the appearance parameters of the weld 30 include the surface quality of the weld 30, such as the smoothness of the surface of the weld 30, surface defects such as cracks and pores, the undercut depth of the weld 30, the height of the weld 30, etc. Considering that these appearance parameters have little effect on the penetration depth of the weld 30, therefore, in the embodiments of the present application, the main focus is on obtaining the appearance parameters that have a greater impact on the penetration depth of the weld 30. In S13, determining the penetration depth of the weld 30 according to the appearance parameters refers to determining the penetration depth of the weld 30 according to the weighted proportion based on the appearance parameters of the weld 30, so that the penetration depth of the weld 30 can be detected and estimated based on the appearance parameters of the weld 30.

[0045] In S14, determining that the penetration of weld 30 is qualified based on that the penetration of weld 30 meets the preset conditions means that the penetration of weld 30 is qualified based on that the detected penetration of weld 30 is consistent with the preset conditions, and the penetration of weld 30 is unqualified if the penetration of weld 30 does not meet the preset conditions, thereby reconfirming the welding quality of weld 30 and performing repair or rework operations when necessary.

[0046] In the technical solution of the embodiment of the present application, by collecting an image of at least a portion of the weld 30 after the sealing pin 20 and the top cover plate 10 are welded, the appearance parameters of the weld 30 in the image are obtained, and the penetration depth of the weld 30 is determined according to the appearance parameters. According to the penetration depth of the weld 30 satisfying the preset conditions, it is determined that the penetration depth of the weld 30 is qualified. The penetration depth of the weld 30 can be detected by the appearance parameters of the weld 30, and there is no need to cut the weld 30, so as to realize the judgment of the quality of the weld 30, thereby improving the rapid detection of the penetration depth of the weld 30 and improving the detection efficiency.

[0047] In some embodiments, Figure 2 As shown, the weld 30 includes a scale 31, wherein the number of the scales 31 is multiple, and the multiple scales 31 form a fish scale structure, wherein the appearance parameters of a scale 31 can be used to characterize the appearance parameters of the weld 30. Figure 2 and Figure 3 As shown, obtaining the appearance parameters of the weld 30 in the image includes obtaining the detection size H of the scale 31 along the first direction. 测, the detection size D of the scale 31 along the second direction 测 And the number of fingerprints detected of the scales 31, wherein the first direction is the welding direction of the weld 30, and the second direction is the depth direction of the weld 30.

[0048] It should be emphasized that the detection size H of the scale 31 along the first direction is 测 , the detection size D of the scale 31 along the second direction 测 It can be obtained by analyzing and processing the collected image, such as obtaining the size between two points through a distance sensor, thereby realizing the size detection. Figure 2 The XX direction in the second direction is Figure 3 In the YY direction, Figure 2 The ZZ direction in the figure is the third direction, that is, the width direction of the scale 31.

[0049] The number of fingerprints detected by the scales 31 mentioned here can also be obtained by appearance, for example Figure 2 In the embodiment, the number of fingerprints of the scale 31 is five, and of course the number of fingerprints of the scale 31 can be adjusted to four or six according to the state of the weld 30. A fingerprint-like structure is formed on each scale 31, and the number of fingerprints detected of the scale 31 can be determined by the number of fingerprints.

[0050] The embodiment of the present application obtains the appearance parameters of the weld 30 in the image, including obtaining the detection size of the scale 31 along the first direction, the detection size of the scale 31 along the second direction, and the detection number of fingerprints of the scale 31. The penetration depth of the weld 30 can be predicted by the detection size of the scale 31 along the first direction, the detection size of the scale 31 along the second direction, and the detection number of fingerprints of the scale 31, thereby achieving accurate prediction of the penetration depth of the weld 30.

[0051] In some embodiments, determining the penetration depth of the weld 30 according to the appearance parameter includes determining the penetration depth of the weld 30 according to the detection size H of the scale 31 along the first direction. 测 , the detection size D of the scale 31 along the second direction 测 The penetration depth of the weld 30 is determined by the number of fingerprints detected of the scale 31, the first weight ratio of the detection size of the scale 31 along the first direction, the second weight ratio of the detection size of the scale 31 along the second direction, and the third weight ratio of the number of fingerprints detected of the scale 31.

[0052] In this embodiment, in addition to considering the detection size H of the scale 31 along the first direction 测 , the detection dimension D of the scale 31 along the second direction 测In addition to the three parameters of the appearance parameters and the number of fingerprints detected of the scales 31, the weight ratio of each parameter is also considered, so that the penetration depth of the weld 30 can be determined by the appearance parameters and the corresponding weight ratio, thereby realizing the detection of the penetration depth of the weld 30.

[0053] It should be emphasized that when determining the penetration depth of weld 30 by the appearance parameters of weld 30, the selection of appearance parameters is crucial. During the laser welding process, a liquid molten pool will be formed. The depth of the molten pool is related to the energy of the laser and the position of the focus. The higher the energy received by the welding surface, the deeper the molten pool formed and the longer the solidification time. When the next welding point is made, the unsolidified molten pool makes the next welding wider and the distance between welds 30 closer. That is, the size of the scale 31 is related to the penetration depth of weld 30. Therefore, the size of the scale 31 can be used as an appearance parameter to determine the penetration depth of weld 30.

[0054] The embodiments of the present application determine the penetration depth of the weld 30 according to the detection size of the scale 31 along the first direction, the detection size of the scale 31 along the second direction and the detected number of fingerprints of the scale 31, as well as a first weight ratio of the detection size of the scale 31 along the first direction, a second weight ratio of the detection size of the scale 31 along the second direction and a third weight ratio of the detected number of fingerprints of the scale 31. The penetration depth of the weld 30 can be further accurately predicted according to the weight ratio of the detection size of the scale 31 along the first direction, the detection size of the scale 31 along the second direction and the detected number of fingerprints of the scale 31, thereby improving the accuracy of detection of the penetration depth of the weld 30.

[0055] In some embodiments, Figure 2 As shown, obtaining the appearance parameters of the weld 30 in the figure also includes obtaining the detection size W of the scale 31 along the third direction. 测 , wherein the third direction intersects with the first direction and the second direction respectively.

[0056] The first direction here is the welding direction of the weld 30. The weld 30 may be in a circular ring structure. The detection dimension W of the scale 31 along the third direction is 测 It is the dimension of the width direction of the weld 30 , and the third direction is the radial direction of the sealing nail 20 , so that the contact surface between the sealing nail 20 and the top cover plate 10 can be fully welded through the weld 30 .

[0057] In the embodiment of the present application, by acquiring the appearance parameters of the weld 30 in the image and also acquiring the detection size of the scale 31 along the third direction, the factors affecting the penetration depth of the weld 30 can be further increased, and the penetration depth of the weld 30 can be predicted more accurately.

[0058] In some embodiments, determining the penetration depth of the weld 30 based on the appearance parameters also includes determining the penetration depth of the weld 30 based on the detection size of the scale 31 along the third direction and the fourth weight ratio of the detection size of the scale 31 along the third direction.

[0059] In the embodiment of the present application, the detection dimension of the scale 31 along the third direction and the fourth weight ratio of the detection dimension of the scale 31 along the third direction are added, so that the penetration depth of the weld 30 can be detected more accurately, thereby achieving accurate judgment of the penetration depth of the weld 30.

[0060] The embodiments of the present application determine the penetration depth of the weld 30 by adding the detection dimension of the scale 31 along the third direction and the fourth weight ratio of the detection dimension of the scale 31 along the third direction. Then, the penetration depth of the weld 30 can be accurately detected according to the detection dimension of the scale 31 along the first direction, the detection dimension of the scale 31 along the second direction, the detection number of fingerprints of the scale 31, the detection dimension of the scale 31 along the third direction, the first weight ratio of the detection dimension of the scale 31 along the first direction, the second weight ratio of the detection dimension of the scale 31 along the second direction, the third weight ratio of the detection number of fingerprints of the scale 31 and the fourth weight ratio of the detection dimension of the scale 31 along the third direction, thereby improving the accuracy of the judgment of the welding quality of the sealing nail 20 of the battery device.

[0061] In some embodiments, the formula for determining the penetration of weld 30 is: ; Wherein, X is the penetration depth of the weld 30, K1 is the first weight ratio of the size of the scale 31 along the first direction, H 标 H is the standard size of the scale 31 along the first direction when the weld 30 is at a standard penetration depth, 测 is the detection size of the scale 31 along the first direction, K2 is the second weight ratio of the detection size of the scale 31 along the second direction, and D 标 is the standard size of the scale 31 along the second direction when the weld 30 is at a standard penetration depth, D 测 is the detection size of the scale 31 along the second direction, K3 is the third weight ratio of the detection number of fingerprints of the scale 31, S 标 is the standard number of fingerprints of the scale 31 when the weld 30 is at a standard penetration depth, S 测 is the number of fingerprints detected by the scale 31, K4 is the fourth weight proportion of the detection size of the scale 31 along the third direction, W 标 W is the standard size of the scale 31 along the third direction when the weld 30 is at a standard penetration depth. 测 is the detection dimension of the scale 31 along the third direction.

[0062] It is important to point out that the standard size under the state of penetration mentioned here is H 标 , S 标 , D 标 and W 标 It is the average size of the welds 30 of multiple battery devices under the state of standard penetration depth. For example, thirty sealing nails 20 can be selected to be welded to the top cover plate 10 respectively, and metallographic detection is performed. When the welds 30 are under the state of standard penetration depth, the appearance parameters of each weld 30 are obtained, and then the average value of these appearance parameters is taken to obtain these parameters.

[0063] It should be noted that a liquid injection port is provided on the top cover plate 10 , and the sealing nail 20 is inserted into the liquid injection port, and the circumference of the sealing nail 20 is welded to the top cover plate 10 to achieve sealing of the liquid injection port.

[0064] The embodiment of the present application introduces the formula of the penetration depth of the weld 30: , the penetration depth of the weld 30 can be accurately calculated based on these appearance parameters and the corresponding weight ratios, thereby achieving accurate detection of the penetration depth of the weld 30.

[0065] In some embodiments, capturing an image of at least a portion of the weld 30 after the sealing pin 20 is welded includes capturing a first image of at least a portion of the weld 30 after the sealing pin 20 is welded from a first perspective; capturing a second image of at least a portion of the weld 30 after the sealing pin 20 is welded from a second perspective; wherein the first perspective and the second perspective intersect.

[0066] The first perspective and the second perspective here can be in a state of vertical intersection. For example, the first image can be a top view of the weld 30, and the second image can be a side view of the weld 30, so that at least two pictures of the weld 30 can be obtained. By collecting information from the two pictures, the appearance parameters that need to be measured of the weld 30 can be obtained.

[0067] In an embodiment of the present application, a first image of at least a portion of the weld 30 after the sealing pin 20 is welded is captured from a first perspective, and a second image of at least a portion of the weld 30 after the sealing pin 20 is welded is captured from a second perspective; wherein the first perspective and the second perspective intersect, and it is convenient to capture images of at least a portion of the weld 30 from at least two perspectives, thereby facilitating the acquisition of appearance parameters of the weld 30.

[0068] In some embodiments, at least a portion of the second image is a state where the first image is in a second viewing angle.

[0069] When the captured image is a portion of the weld 30 , the first image and the second image are states of the portion of the weld 30 after being photographed at the first viewing angle and the second viewing angle, respectively.

[0070] In the embodiment of the present application, by setting at least a portion of the second image to be a state where the first image is in a second viewing angle, the first image and the second image of the same portion of the weld 30 between the sealing pin 20 and the top cover plate 10 can be used, thereby obtaining appearance parameters of the same portion of the weld 30 and improving the accuracy of detecting the penetration depth of the weld 30.

[0071] In some embodiments, based on the penetration of weld 30 satisfying preset conditions, determining whether the penetration of weld 30 is qualified specifically includes judging whether the penetration of weld 30 is greater than or equal to a first preset value. If so, it is determined that the penetration of weld 30 is qualified; if not, it is determined that the penetration of weld 30 is unqualified.

[0072] The preset conditions here can be selected and set as needed. For example, the first preset value can be selected as 1. When X is greater than 1, the penetration of the weld 30 is considered to be qualified. When X is less than or equal to 1, the penetration of the weld 30 is considered to be unqualified. At this time, other methods are needed to accurately measure the penetration of the weld 30.

[0073] The embodiment of the present application determines whether the penetration of the weld 30 is greater than or equal to the first preset value. If so, it is determined that the penetration of the weld 30 is qualified; if not, it is determined that the penetration of the weld 30 is unqualified. The welding quality of the weld 30 can be judged based on the relationship between the detected penetration of the weld 30 and the first preset value, and unqualified battery devices can be screened, thereby reducing the probability of batch abnormalities in battery devices and reducing the production cost of battery devices.

[0074] It is understandable that X here can also select other data as needed. In the specific operation process, you can use To calculate the depth of penetration.

[0075] Of course, the coefficients of the formula here can also be adjusted as needed, for example, the formula can be adjusted to wait.

[0076] It should be noted that if Figure 4 As shown, in the process of accurately measuring the penetration depth L of the weld 30, the weld 30 can be cut to obtain, and if it is consistent with the calculated result, it can be determined that the prediction of the penetration depth L of the weld 30 is relatively accurate, and this method can be used to realize the detection of the penetration depth.

[0077] In addition, considering that there are multiple scales 31 on the weld 30, when obtaining the size of the scale 31, the sizes of the multiple scales 31 can be obtained at the same time, and the penetration depth of each scale 31 is calculated. When the penetration depth of each scale 31 is qualified, the battery device can be identified as a qualified product. When the penetration depth of a certain scale 31 is unqualified, the battery device needs to be identified as an unqualified product and an early warning is issued, so as to further judge the quality of the weld 30 and reduce the probability of unqualified battery devices flowing into the next process.

[0078] like Figure 5 As shown, Figure 5 The present invention is a schematic structural diagram of a device 40 for detecting the penetration of a weld 30 according to an exemplary embodiment. The detection device 40 includes a collection module 41 for collecting an image of at least a portion of the weld 30 after welding with a sealing pin 20; an acquisition module 42 for acquiring appearance parameters of the weld 30 in the image; a first determination module 43 for determining the penetration of the weld 30 according to the appearance parameters; and a second determination module 44 for determining whether the penetration of the weld 30 is qualified according to whether the penetration of the weld 30 meets a preset condition.

[0079] The implementation process of the functions and effects of each module in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, which will not be repeated here.

[0080] The embodiments of the present application also disclose a battery production line, including the device for detecting the penetration depth of the weld mentioned in the above embodiments, which can detect the penetration depth of the weld.

[0081] It is understandable that the battery production line here also includes welding equipment, winding equipment and other equipment that are essential in the battery production process, which will not be elaborated here.

[0082] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0083] A method for detecting the penetration of a weld 30 includes collecting an image of at least a portion of the weld 30 between a sealing pin 20 and a top cover plate 10; acquiring appearance parameters of the weld 30 in the image; determining the penetration of the weld 30 according to the appearance parameters; and determining that the penetration of the weld 30 is qualified according to whether the penetration of the weld 30 meets a preset condition. Further, the weld 30 includes a scale 31; acquiring the appearance parameters of the weld 30 in the image includes acquiring the detection size of the scale 31 along a first direction, the detection size of the scale 31 along a second direction, and the detection number of fingerprints of the scale 31, wherein the first direction is the welding direction of the weld 30, and the second direction is the depth direction of the weld 30. Further, determining the penetration of the weld 30 according to the appearance parameters includes determining the penetration of the weld 30 according to the detection size of the scale 31 along the first direction, the detection size of the scale 31 along the second direction, the detection number of fingerprints of the scale 31, the first weight ratio of the detection size of the scale 31 along the first direction, the second weight ratio of the detection size of the scale 31 along the second direction, and the third weight ratio of the detection number of fingerprints of the scale 31. Further, acquiring the appearance parameters of the weld 30 in the image also includes acquiring the detection size of the scale 31 along a third direction, wherein the third direction intersects with the first direction and the second direction, respectively. Further, determining the penetration of the weld 30 according to the appearance parameters also includes determining the penetration of the weld 30 according to the detection size of the scale 31 along the third direction and the fourth weight ratio of the detection size of the scale 31 along the third direction. Further, the formula for determining the penetration of the weld 30 is ; Wherein, X is the penetration depth of the weld 30, K1 is the first weight ratio of the size of the scale 31 along the first direction, H 标 H is the standard size of the scale 31 along the first direction when the weld 30 is at a standard penetration depth, 测 is the detection size of the scale 31 along the first direction, K2 is the second weight ratio of the detection size of the scale 31 along the second direction, and D 标 is the standard size of the scale 31 along the second direction when the weld 30 is at a standard penetration depth, D 测 is the detection size of the scale 31 along the second direction, K3 is the third weight ratio of the detection number of fingerprints of the scale 31, S 标 is the standard number of fingerprints of the scale 31 when the weld 30 is at a standard penetration depth, S 测 is the number of fingerprints detected by the scale 31, K4 is the fourth weight proportion of the detection size of the scale 31 along the third direction, W 标 W is the standard size of the scale 31 along the third direction when the weld 30 is at a standard penetration depth. 测is the detection dimension of the scale 31 along the third direction. Further, collecting an image of at least a portion of the weld 30 between the sealing nail 20 and the top cover plate 10 includes collecting a first image of at least a portion of the weld 30 between the sealing nail 20 and the top cover plate 10 from a first perspective; collecting a second image of at least a portion of the weld 30 between the sealing nail 20 and the top cover plate 10 from a second perspective; wherein the first perspective and the second perspective intersect. Further, at least a portion of the second image is a state where the first image is in the second perspective. Further, according to the penetration of the weld 30 satisfying a preset condition, determining that the penetration of the weld 30 is qualified specifically includes determining whether the penetration of the weld 30 is greater than or equal to a first preset value, and if so, determining that the penetration of the weld 30 is qualified; if not, determining that the penetration of the weld 30 is unqualified.

[0084] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0085] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0086] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0087] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for detecting the penetration depth of a weld, characterized in that: include: Capturing an image of at least a portion of a weld after the sealing pin is welded to the top cover plate; Acquire appearance parameters of the weld in the image; Determining the penetration depth of the weld according to the appearance parameters; According to the penetration depth of the weld meeting a preset condition, it is determined that the penetration depth of the weld is qualified.

2. The method for detecting the penetration depth of a weld according to claim 1, wherein: The weld includes scales; Obtaining the appearance parameters of the weld in the image includes obtaining the detection size of the scale along a first direction, the detection size of the scale along a second direction, and the detection number of fingerprints of the scale, wherein the first direction is the welding direction of the weld and the second direction is the depth direction of the weld.

3. The method for detecting the penetration depth of a weld according to claim 2, characterized in that: Determining the penetration of the weld according to the appearance parameters includes: The penetration depth of the weld is determined based on the detection size of the scale along the first direction, the detection size of the scale along the second direction, the detection number of fingerprints of the scale, the first weight ratio of the detection size of the scale along the first direction, the second weight ratio of the detection size of the scale along the second direction and the third weight ratio of the detection number of fingerprints of the scale.

4. The method for detecting the penetration depth of a weld according to claim 3, characterized in that: Acquiring the appearance parameters of the weld in the image also includes acquiring the detection size of the scale along a third direction, wherein the third direction intersects with the first direction and the second direction respectively.

5. The method for detecting the penetration depth of a weld according to claim 4, characterized in that: Determining the penetration depth of the weld according to the appearance parameter also includes: The penetration depth of the weld is determined according to the detection size of the scale along the third direction and a fourth weight ratio of the detection size of the scale along the third direction.

6. The method for detecting the penetration depth of a weld according to claim 5, characterized in that: The formula for determining the penetration of the weld is ; Wherein, X is the penetration depth of the weld, K1 is the first weight ratio of the size of the scale along the first direction, H 标 is the standard size of the scale along the first direction when the weld is at a standard penetration depth, H 测 is the detection size of the scale along the first direction, K2 is the second weight ratio of the detection size of the scale along the second direction, and D 标 is the standard size of the scale along the second direction when the weld is at a standard penetration depth, D 测 is the detection size of the scale along the second direction, K3 is the third weight ratio of the detection number of the fingerprint of the scale, S 标 is the standard number of fingerprints of the scale when the weld is at a standard penetration depth, S 测 is the number of fingerprints detected on the scale, K4 is the fourth weight proportion of the detection size of the scale along the third direction, W 标 W is the standard size of the scale along the third direction when the weld is at a standard penetration depth. 测 is the detection dimension of the scale along the third direction.

7. The method for detecting the penetration depth of a weld according to any one of claims 1 to 6, characterized in that: Capturing an image of at least a portion of a weld between the sealing pin and the top cover plate includes: Acquire a first image of at least a portion of a weld between the sealing pin and the top cover plate from a first viewing angle; Acquire a second image of at least a portion of the weld between the sealing pin and the top cover plate from a second viewing angle; Wherein, the first perspective and the second perspective intersect.

8. The method for detecting the penetration depth of a weld according to claim 7, characterized in that: At least a portion of the second image is a state where the first image is at the second viewing angle.

9. The method for detecting the penetration depth of a weld according to any one of claims 1 to 6, characterized in that: According to the penetration of the weld meeting the preset condition, determining whether the penetration of the weld is qualified specifically includes: Determining whether the penetration depth of the weld is greater than or equal to a first preset value, and if so, determining that the penetration depth of the weld is qualified; If not, it is determined that the penetration of the weld is unqualified.

10. A device for detecting the penetration depth of a weld, characterized in that: The detection device comprises: A collection module, used to collect an image of at least a portion of a weld between the sealing pin and the top cover plate; An acquisition module, used for acquiring appearance parameters of the weld in the image; A first determination module, used to determine the penetration depth of the weld according to the appearance parameters; The second determination module is used to determine whether the penetration of the weld is qualified according to whether the penetration of the weld meets a preset condition.

11. A battery production line, characterized in that: A device for detecting the penetration depth of a weld comprising the device as claimed in claim 10.

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