A test method for metal shavings in battery casings

Abstract

This invention provides a method for testing metal shavings from battery casings, comprising the following steps: S1: Wearing clean gloves, remove the battery casing and place it face down on an adhesive mat. Use a tool to tap the outer bottom of the battery casing, then tap the outer middle part of the casing to dislodge the metal shavings inside and collect them on the adhesive mat; S2: Place the adhesive mat containing the collected metal shavings on the working platform of an optical imaging instrument, turn on the instrument and its accompanying computer, select a magnification of 120x, turn on the light source on the instrument, move the X and Y axes of the working platform and rotate the handle to adjust the focus, so that the sample being tested achieves a clear image; S3: Select the software tool "Geometric Measurement / Automatic Line Measurement Tool," and use the mouse to select two points at each end along the length of the shavings in the image measurement window. This method for testing metal shavings from battery casings is simple to operate and can quantitatively measure the quantity and size of the metal shavings.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing quality inspection technology, and more specifically, to a method for testing metal shavings in battery casings, applicable to quality monitoring during battery production. Background Technology

[0002] If metal shavings remain inside the battery casing during battery production, it can lead to internal short circuits, increased self-discharge, and even serious safety hazards such as thermal runaway. Therefore, effective detection of metal shavings inside the battery casing is a crucial aspect of battery quality control.

[0003] In existing technologies, the detection of metal shavings in battery casings mostly relies on manual visual inspection or simple tapping and observation. There is a lack of quantitative testing methods, making it difficult to accurately obtain the size distribution and quantity of metal shavings. This results in highly subjective test results with poor repeatability, which cannot meet the requirements of refined quality management.

[0004] Therefore, there is an urgent need for a simple testing method that can quantitatively measure the quantity and size of metal shavings, so as to improve the objectivity and consistency of the test results and facilitate standardized quality control in the battery production process. Summary of the Invention

[0005] The present invention aims to solve the technical problems mentioned in the background art and provide a testing method for metal scraps in battery casings. This method can effectively obtain the quantity and size distribution of metal scraps, realize the quantitative detection of metal scraps, improve detection accuracy and repeatability, and provide objective and accurate detection results.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for testing metal shavings in a battery casing, comprising the following steps: S1: Wearing clean gloves, remove the battery case and place it with the opening facing down on the adhesive mat. Use a tool to tap the outer bottom of the battery case, and then tap the outer middle part of the battery case to dislodge the metal shavings inside the battery case and collect them on the adhesive mat. S2: Place the dust-collecting pad containing metal shavings on the working platform of the optical imaging instrument, turn on the instrument and the matching computer, select the magnification of 120x, turn on the light source on the instrument, move the X and Y axes of the working platform and rotate the handle to adjust the focus so that the sample being tested can achieve a clear image. S3: Select the software tool "Geometric Measurement / Automatic Line Measurement Tool", use the mouse to select 2 points at each end along the length of the debris in the image measurement window, right-click in the blank area of ​​the image measurement window, and the selected 2 points will be automatically connected into a line segment; S4: Move the X-axis and repeat the above operation to obtain the line segment on the other side of the debris length direction. After selecting the software tool "Geometric Measurement / Composite Part / Average Distance Between Two Lines", click on the two line segments respectively in the calculation window in the lower left corner of the software. The distance obtained is the debris length, in mm. S5: The quantity and size of the metal shavings obtained from the test of the battery casing.

[0007] Furthermore, in step S1, the striking is performed using a non-metallic tool, the tool being made of PA6 high-wear-resistant nylon rod.

[0008] Furthermore, in step S1, the distance between the opening of the battery casing and the adhesive pad is 3-4 cm.

[0009] Furthermore, the measuring device used to determine the quantity and size of the metal chips is an optical imager.

[0010] Furthermore, in step S2, the magnification is achieved by selecting the magnification scale 3 of the imager, which corresponds to a magnification of 120 times.

[0011] Furthermore, in step S3, the automatic line measurement tool is the "geometric measurement / automatic line measurement tool" in the image measurement software.

[0012] Furthermore, the length of the debris is measured by calculating the perpendicular distance between two parallel line segments using the "average distance between two lines" tool.

[0013] Furthermore, the optical imager employs an upper light source illumination method during the measurement process.

[0014] The beneficial effects of this invention are as follows: The method for testing metal shavings from battery casings uses a standardized tapping operation to collect the shavings. Combined with an optical imager and dedicated measurement software, it enables precise and repeatable quantitative testing of the quantity and size of the metal shavings. This method is simple to operate, provides objective test results, avoids the subjectivity of manual visual inspection, and is suitable for quality control and data traceability in the battery production process, significantly improving testing efficiency and quality management. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only drawings of some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of the present invention.

[0016] Figure 1 This is a schematic diagram of the method steps of the present invention.

[0017] Figure 2 This is a schematic diagram of the battery casing metal shavings collection operation according to the present invention.

[0018] Figure 3 This is a schematic diagram of the interface for measuring the size of metal chips using the optical imaging instrument of the present invention. Detailed Implementation

[0019] 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, and 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.

[0020] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] like Figures 1 to 3 As shown in the figure, an embodiment of the present invention provides a method for testing metal shavings in a battery casing, which includes the following steps: S1: Wearing clean gloves, remove the battery casing and place it face down on the adhesive mat. Use a tool to tap the outer bottom of the battery casing, and then tap the outer middle part of the battery casing to dislodge the metal shavings inside the battery casing and collect them on the adhesive mat. This invention collects metal shavings through a simple tapping operation, and combines an optical imager and supporting software for measurement. No complicated sample pretreatment or professional operating skills are required. The detection process is fast and suitable for batch testing in production sites. S2: Place the adhesive pad containing metal shavings on the working platform of the optical imaging instrument, turn on the instrument and its accompanying computer, select 120x magnification, turn on the instrument's light source, move the X and Y axes of the working platform and rotate the handle to adjust the focus, so that the sample being tested achieves a clear image; among these adjustments, the parameters are adjusted to achieve the clearest image of the sample being tested; this invention uses 120x optical magnification and upper light source illumination, which can clearly present the shape of tiny metal shavings, and achieves automated quantitative measurement of size through the "automatic line measurement tool" and "average distance between two lines" functions, avoiding subjective errors of manual visual inspection, and the test results are accurate and have good repeatability; S3: Select the software tool "Geometric Measurement / Automatic Line Measurement Tool", use the mouse to select 2 points at each end along the length of the debris in the image measurement window, right-click in the blank area of ​​the image measurement window, and the selected 2 points will be automatically connected into a line segment; wherein, determine the position of the metal debris and take its two ends, connect the two ends of the metal debris to obtain the size of the metal debris; S4: Move the X-axis and repeat the above operation to obtain the line segment on the other side of the debris length direction. After selecting the software tool "Geometric Measurement / Composite Part / Average Distance Between Two Lines", click on the two line segments respectively in the calculation window in the lower left corner of the software. The distance obtained is the debris length, in mm. S5: Repeat the above measurement steps to count the number of metal shavings from the battery casing and the size of each shaving.

[0023] In one embodiment, in step S1, the striking is performed using a non-metallic tool made of PA6 high-wear-resistant nylon rod. The striking is performed using a special striking tool to ensure consistency in striking force and position. The striking tool is made of non-metallic material, specifically a PA6 high-wear-resistant nylon rod, to prevent the introduction of metal foreign objects.

[0024] In one embodiment, in step S1, the distance between the opening of the battery casing and the adhesive pad is 3-4 cm to ensure effective collection of metal shavings and avoid splashing.

[0025] In one embodiment, the measuring device used to determine the quantity and size of metal shavings is an optical imager with a magnification of 120 times, which can clearly show the shape of tiny metal shavings. The optical imager used in this invention is a commonly used measuring device, eliminating the need to purchase expensive special testing instruments. Furthermore, the cost of consumables such as dust pads is low. The overall testing system requires little investment and is easy to maintain, making it convenient to promote and apply in the quality testing process of battery manufacturing enterprises.

[0026] In one embodiment, in step S2, the magnification is achieved by selecting the magnification scale 3 of the imager, which corresponds to a magnification of 120 times.

[0027] In one embodiment, in step S3, the automatic line measurement tool is the "geometric measurement / automatic line measurement tool" in the image measurement software.

[0028] In one embodiment, the length of the debris is measured by calculating the vertical distance between two parallel line segments using the "two-line average distance" tool, thereby achieving automatic quantification of the size.

[0029] In one embodiment, the optical imager uses an uplight illumination method during the measurement process to enhance the contrast between the metal chips and the background.

[0030] Furthermore, through standardized operating procedures and quantitative measurement methods, this invention enables the data recording and traceability of metal scrap detection results, which is conducive to establishing quality control standards for battery casing cleanliness and further improving the safety and consistency of battery products.

[0031] The following description, in conjunction with specific embodiments, provides further details.

[0032] Instruments and tools: Optical imager (VML250), blue adhesive paper (20*50cm), and percussion tools (PA6 high abrasion resistant nylon rods). Example

[0033] According to the method described in the invention, place the battery case 3-4 cm above the adhesive paper, and tap the outer bottom and outer middle of the battery case with a PA6 nylon rod.

[0034] Place the adhesive paper containing metal shavings on the test platform of the optical image instrument, adjust the magnification of the image instrument to 120x, turn on the light source on the instrument, move the X and Y axes of the working platform, and rotate the handle to adjust the focus.

[0035] Locate the metal shavings, select the software tool "Geometric Measurement / Automatic Line Measurement Tool", use the mouse to select two points at each end along the length of the shavings in the image measurement window, right-click in the blank area of ​​the image measurement window, and the two selected points will be automatically connected into a line segment.

[0036] Move the X-axis and repeat the above operation to obtain the line segment on the other side of the debris length direction. Select the software tool "Geometric Measurement Composite Part / Average Distance Between Two Lines", and click on the two line segments respectively in the calculation window in the lower left corner of the software. The distance obtained is the debris length, specifically 0.445mm.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for testing metal shavings in a battery casing, characterized in that, Includes the following steps: S1: Wearing clean gloves, remove the battery case and place it with the opening facing down on the adhesive mat. Use a tool to tap the outer bottom of the battery case, and then tap the outer middle part of the battery case to dislodge the metal shavings inside the battery case and collect them on the adhesive mat. S2: Place the dust-collecting pad containing metal shavings on the working platform of the optical imaging instrument, turn on the instrument and the matching computer, select the magnification of 120x, turn on the light source on the instrument, move the X and Y axes of the working platform and rotate the handle to adjust the focus so that the sample being tested can achieve a clear image. S3: Select the software tool "Geometric Measurement / Automatic Line Measurement Tool", use the mouse to select 2 points at each end along the length of the debris in the image measurement window, right-click in the blank area of ​​the image measurement window, and the selected 2 points will be automatically connected into a line segment; S4: Move the X-axis and repeat the above operation to obtain the line segment on the other side of the debris length direction. After selecting the software tool "Geometric Measurement / Composite Part / Average Distance Between Two Lines", click on the two line segments respectively in the calculation window in the lower left corner of the software. The distance obtained is the debris length, in mm. S5: The quantity and size of the metal shavings obtained from the test of the battery casing.

2. The method for testing metal shavings in a battery casing according to claim 1, characterized in that: In step S1, the striking is performed using a non-metallic tool, which is made of PA6 high-wear-resistant nylon rod.

3. The method for testing metal shavings in a battery casing according to claim 1, characterized in that: In step S1, the distance between the opening of the battery casing and the adhesive pad is 3-4 cm.

4. The method for testing metal shavings in a battery casing according to claim 1, characterized in that: The measurement equipment used to determine the quantity and size of the metal chips is an optical imager.

5. The method for testing metal shavings in a battery casing according to claim 1, characterized in that: In step S2, the magnification is achieved by selecting the magnification scale 3 of the imager, which corresponds to a magnification of 120 times.

6. The method for testing metal shavings in a battery casing according to claim 1, characterized in that: In step S3, the automatic line measurement tool is the "Geometric Measurement / Automatic Line Measurement Tool" in the image measurement software.

7. The method for testing metal shavings in a battery casing according to claim 1, characterized in that: The length of the debris is measured by calculating the perpendicular distance between two parallel line segments using the "average distance between two lines" tool.

8. The method for testing metal shavings in a battery casing according to claim 1, characterized in that: The optical imager uses an upper light source illumination method during the measurement process.

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