Battery calibration piece and battery appearance detection equipment

Abstract

The invention provides a battery calibration piece and battery appearance detection equipment, and belongs to the field of battery optical detection, and the battery calibration piece comprises a battery calibration body and a plurality of three-dimensional calibration blocks; the whole battery calibration body is of a profiling body structure of the battery, and a plurality of edge graduated scales corresponding to the edges are arranged on the outer surface of the profiling body structure; the three-dimensional calibration block is arranged on the peripheral surface of the battery calibration body, is provided with a plurality of calibration points and is of a pyramid structure as a whole. According to the standard calibration coordinate system of the battery calibration piece, a product subjected to three-dimensional scanning can conveniently obtain an accurate three-dimensional point cloud, the battery appearance detection equipment judges whether flaws exist or not based on the product three-dimensional information obtained by the battery calibration piece, the detection precision and efficiency of the battery appearance size are improved, the cost is low, and the practicability is high. The scheme can be popularized and applied in scenes needing three-dimensional detection, such as energy storage batteries and power batteries.

Description

Technical Field

[0001] This invention belongs to the field of battery testing, specifically relating to a battery calibration component and a battery appearance testing device. Background Technology

[0002] Existing small and medium-sized batteries (see) Figure 1 The detection of defects still relies on manual inspection or basic 2D vision inspection. Manual inspection is easily affected by subjective fatigue and experience differences, with a false negative rate as high as 3%-5%, and it is completely unsuitable for high-speed production lines. 2D vision inspection is difficult to deal with the interference caused by the complex materials of batteries. For example, as a highly reflective material, the coating has inconspicuous defects such as foreign objects, surface bubbles, and wrinkles. At the same time, 2D technology cannot obtain height information of defects such as weld slag and bumps, resulting in high over-detection and false negative rates.

[0003] While advanced non-destructive testing technologies such as X-ray CT and micro-CT exist internationally, enabling the detection of internal defects at micron-level resolution, such as electrode misalignment and dendrite growth, these devices are expensive to manufacture and maintain, hindering large-scale deployment. Furthermore, dynamic testing technologies like real-time X-ray imaging are primarily used in R&D or high-end mass production lines, lacking adaptability to conventional battery production lines and subject to stringent environmental requirements and external interference.

[0004] While advanced technologies such as 3D vision and AI deep learning can improve inspection accuracy, the equipment costs are high. For example, high-precision 3D structured light cameras are expensive and difficult to widely adopt. At the same time, 3D inspection solutions generally suffer from slow inspection speeds, while battery production lines operate at high speeds. After deducting the time for mechanical actions, the time left for software inspection is extremely short. The compatibility of 3D technology with high-speed production lines is difficult, making it hard to balance accuracy and efficiency.

[0005] Therefore, for battery testing, a battery calibration component needs to be designed for 3D inspection and calibration to improve the accuracy and efficiency of defect identification. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention aims to provide a battery calibration component and a battery appearance inspection device, which can solve the above-mentioned problems.

[0007] A battery calibration component includes a battery calibration body and multiple three-dimensional calibration blocks; the battery calibration body is an overall shape-imitating structure of a battery, and multiple edge scales corresponding to the edges are set on the outer surface of the shape-imitating structure; the three-dimensional calibration blocks are set on the outer peripheral surface of the battery calibration body, and the three-dimensional calibration blocks are calibration blocks with multiple calibration points and an overall pyramid structure.

[0008] Furthermore, the battery calibrator also includes a crosshair, which is disposed on at least one outer surface of the battery calibrator.

[0009] Furthermore, the battery calibration body also includes a crosshair locator, which is located on the top surface of the battery calibration body, the terminal post position, the explosion-proof valve position, and / or the QR code position.

[0010] Furthermore, the battery calibration body also includes a gradient calibration group, which includes multiple groups of gradient symbols with gradually increasing areas set within a gradient frame.

[0011] Furthermore, the three-dimensional calibration block includes a mounting base plate and a calibration boss. The calibration boss is in the form of a multi-faceted pyramid and is set on the mounting base plate. Each endpoint of the multi-faceted pyramid is a three-dimensional calibration point.

[0012] This invention also provides a battery appearance inspection device, which includes a loading inspection station, a second inspection station, a third inspection station, and a sorting and unloading station. The loading inspection station, the second inspection station, and the third inspection station are based on 2D optics combined with 3D height verification to achieve full inspection of the battery's six sides, octagons, dodecagons, QR codes, explosion-proof valves, and terminals. The 3D height verification is based on the aforementioned battery calibration components to obtain a calibration coordinate system, scans the obtained 3D point cloud of the product, calculates the matrix from the extreme points to the reference plane, and takes the maximum value as the judgment height. The sorting and unloading station automatically sorts and unloads the products according to the inspection results.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The battery calibration component of this application is equipped with a calibration scale and a three-dimensional calibration block, which facilitates the formation of a standard calibration coordinate system, so that the three-dimensional scanned product can obtain an accurate three-dimensional point cloud. The battery appearance inspection equipment determines whether there are defects based on the three-dimensional information of the product obtained by the battery calibration component, which improves the detection accuracy and efficiency of battery appearance dimensions. It is low in cost and the solution can be promoted and applied in scenarios that require three-dimensional inspection, such as energy storage batteries and power batteries. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the battery structure; Figure 2 This is a structural schematic diagram of the battery calibration component; Figure 3 Schematic diagrams of different examples of the gradient calibration group; Figure 4 This is a schematic diagram of the structure of the three-dimensional calibration block; Figure 5 A schematic diagram showing the location of the three-dimensional calibration points for the three-dimensional calibration block; Figure 6 This is a schematic diagram of a battery appearance inspection device. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] See Figures 1-5 A battery calibration component includes a battery calibration body 1 and multiple three-dimensional calibration blocks 2. The battery calibration body 1 is a shape-imitating structure of a battery, and multiple edge scales 11 corresponding to the edges are provided on the outer surface of the shape-imitating structure. The three-dimensional calibration blocks 2 are disposed on the outer peripheral surface of the battery calibration body 1, and the three-dimensional calibration blocks 2 are calibration blocks with multiple calibration points and an overall pyramid structure.

[0017] The edge scale 11 is located on the edge of the battery calibration body 1.

[0018] Further, see Figure 2 The battery calibration body 1 also includes a crosshair 12, which is disposed on at least one outer surface of the battery calibration body 1.

[0019] In the illustrated example, the crosshair scale 12 is set on two opposite large surfaces of the battery calibrator 1. A horizontal scale 15 is set in the middle of the other two sides.

[0020] Further, see Figure 2 The battery calibration body 1 also includes a cross locator 13, which is disposed on the top surface of the battery calibration body 1, the terminal post position, the explosion-proof valve position and / or the QR code position.

[0021] In the illustrated example, the cross locator 13 is located on the top surface of the battery calibrator 1 and at the terminal point, and the cross locator 13 adopts a cross-shaped concave symbol.

[0022] Further, see Figure 2 The battery calibration body 1 also includes a gradient calibration group 14, which includes multiple groups of gradient symbols with gradually increasing areas set within a gradient frame.

[0023] In the example shown, the gradient box is a rectangle, and the gradient symbol is a circle. Of course, the gradient box can also be a circle, and the gradient symbol can be a rectangle, rhombus, triangle, etc. The form is not limited here.

[0024] The three-dimensional calibration block 2 includes a mounting base plate 21 and a calibration boss 22. The calibration boss 22 is a multi-faceted pyramid and is set on the mounting base plate 21. Each end point of the multi-faceted pyramid is a three-dimensional calibration point.

[0025] The diagram shows that boss 22 is a frustum of a square pyramid. See [reference needed]. Figure 5 The truncated pyramid has eight three-dimensional calibration points. It is installed on the middle of the upper surface of the mounting base 21. The mounting base 21 is square. The entire three-dimensional calibration block 2 is pyramid-shaped.

[0026] Furthermore, multiple auxiliary recesses are provided around the mounting location of the non-standard boss 22 on the mounting base plate 21.

[0027] See Figure 6 A battery appearance inspection device, comprising a feeding inspection station 1000, a second inspection station 2000, a third inspection station 3000, and a sorting and unloading station 4000.

[0028] The loading and testing station 1000, the second testing station 2000, and the third testing station 3000 are based on 2D optics combined with 3D height verification to achieve full inspection of the battery's six sides, octagons, dodecagons, QR codes, explosion-proof valves, and terminals. The 3D height verification is based on the aforementioned battery calibration components to obtain a calibration coordinate system, and scans the obtained product 3D points to calculate the matrix from the extreme points of the cloud computing to the reference plane, taking the maximum value as the judgment height. The sorting and unloading station 4000 realizes automatic sorting and unloading based on the product inspection results.

[0029] This device, based on a CCD camera and a scanning laser, is the first to combine 2D defects with 3D height reassessment for result output.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery calibration component, characterized in that: The battery calibration component includes a battery calibration body (1) and multiple three-dimensional calibration blocks (2); The battery calibration body (1) is a battery-shaped structure, and multiple edge scales (11) corresponding to the edges are set on the outer surface of the shape-shaped structure. The three-dimensional calibration block (2) is set on the outer peripheral surface of the battery calibration body (1). The three-dimensional calibration block (2) is a calibration block with multiple calibration points and an overall pyramid structure.

2. The battery calibration component according to claim 1, characterized in that: Edge scale (11) is set on the edge of the battery calibration body (1).

3. The battery calibration component according to claim 1, characterized in that: The battery calibration body (1) also includes a cross scale (12) which is disposed on at least one outer surface of the battery calibration body (1).

4. The battery calibration component according to claim 1, characterized in that: The battery calibration body (1) also includes a cross locator (13), which is set on the top surface of the battery calibration body (1), the terminal post position, the explosion-proof valve position and / or the QR code position.

5. The battery calibration component according to claim 1, characterized in that: The battery calibration body (1) also includes a gradient calibration group (14), which includes multiple groups of gradient symbols with gradually increasing areas set within the gradient frame.

6. The battery calibration component according to claim 1, characterized in that: The three-dimensional calibration block (2) includes a mounting base plate (21) and a calibration boss (22). The calibration boss (22) is a multi-faceted pyramid and is set on the mounting base plate (21). Each end point of the multi-faceted pyramid is a three-dimensional calibration point.

7. A battery appearance inspection device, characterized in that: The equipment includes a feeding inspection station (1000), a second inspection station (2000), a third inspection station (3000), and a sorting and unloading station (4000). The feeding inspection station (1000), the second inspection station (2000), and the third inspection station (3000) are based on 2D optics combined with 3D height verification to achieve full inspection of the six sides, octagons, dodecagons, QR codes, explosion-proof valves, and terminals of the battery. The 3D height verification is based on the battery calibration component described in any one of claims 1-6 to obtain a calibration coordinate system, scan the obtained 3D point cloud of the product and calculate the matrix from the extreme points to the reference plane, and take the maximum value as the judgment height. The battery calibration component obtains the product's 3D point cloud, and takes the maximum value as the judgment height through the matrix from the extreme points to the reference plane; the sorting and unloading station (4000) realizes automatic sorting and unloading based on the product inspection results.

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