Battery manufacturing system and manufacturing method thereof

Abstract

The invention provides a battery manufacturing system and a battery manufacturing method. The present disclosure relates to a battery manufacturing system for manufacturing a battery cell including an electrode assembly in which a plurality of electrodes are stacked, the battery manufacturing system may include a vision device for inspecting foreign matter located on the electrodes. According to the battery manufacturing system and the manufacturing method, foreign matters on the surface of the electrode can be detected in an early stage.

Description

Technical Field

[0001] This disclosure relates to a battery manufacturing system and manufacturing method. Background Technology

[0002] Typically, electrode manufacturing equipment can manufacture rolled electrodes according to specifications, and the specifications of the electrodes can vary depending on the shape of the secondary battery. For cylindrical and prismatic batteries, electrode assemblies formed by winding electrodes with a longer width can be inserted inside, while for pouch batteries, electrode assemblies formed by stacking electrodes with a shorter width can be inserted inside.

[0003] During the electrode manufacturing process, electrode fragments and other foreign objects may be generated. These foreign objects may be located on the electrode surface, but currently, the electrode surface is not inspected for foreign objects before the electrode assembly is formed. Therefore, there is a problem of manufacturing electrode assemblies with foreign objects on the electrode surface. Summary of the Invention

[0004] Technical issues

[0005] According to one aspect of this disclosure, the problem to be solved is the early detection of foreign matter on the surface of the electrode.

[0006] According to another aspect of this disclosure, the problem to be solved is to confirm whether there are foreign objects generated by the electrode manufacturing apparatus on the electrode surface.

[0007] According to another aspect of this disclosure, the problem to be solved is to confirm whether there are foreign objects on the electrode surface before stacking the electrodes.

[0008] According to another aspect of this disclosure, the problem to be solved is to determine the boundaries of the electrode surface shape by analyzing captured images.

[0009] According to another aspect of this disclosure, the problem to be solved is to determine the location of the foreign object on the electrode surface.

[0010] According to another aspect of this disclosure, the problem to be solved is to detect foreign objects larger than a predetermined size.

[0011] According to another aspect of this disclosure, the problem to be solved is to improve the performance of electrode components manufactured by the battery manufacturing system.

[0012] According to another aspect of this disclosure, the problem to be solved is to improve the performance of a single battery cell, including electrode components.

[0013] According to another aspect of this disclosure, the problem to be solved is to improve the safety of battery manufacturing systems used to manufacture battery cells.

[0014] This disclosure can be widely applied to green technology fields such as electric vehicles, battery charging stations, and other battery-powered solar and wind power generation. Furthermore, this disclosure can be used for eco-friendly electric vehicles and hybrid vehicles that prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0015] Technical solution

[0016] A battery manufacturing system according to an embodiment of the present disclosure includes a vision device for inspecting foreign objects located on an electrode. The vision device may include: a moving part that supports the electrode and moves the electrode to a shooting point; a shooting part located above the moving part that takes a picture of the surface of the electrode located at the shooting point; an illumination part that illuminates light into an illumination area larger than the shooting point; and a control part that, when the electrode is located in the illumination area, analyzes the image taken by the shooting part of the electrode to determine and detect foreign objects distributed on the surface of the electrode.

[0017] Before judging foreign objects distributed on the surface of the electrode, the control unit can determine the boundary of the surface shape of the electrode by analyzing the captured image.

[0018] The illumination unit includes multiple light sources, which can be arranged along the moving direction of the electrode and the direction perpendicular to the moving direction to illuminate the boundary.

[0019] In the illumination unit, the length of the light source disposed in the direction perpendicular to the moving direction may be greater than the length of the electrode extending in the direction perpendicular to the moving direction.

[0020] The control unit can export an internal region image of the electrode's internal region corresponding to the interior of the boundary from the captured image, and determine whether the foreign object is distributed in the internal region image.

[0021] The control unit can convert the pixels of the internal region image into numerical values ​​and determine that the foreign object is distributed at pixels with values ​​above a reference value.

[0022] The control unit can adjust the brightness or contrast of pixels with values ​​above the reference value to distinguish the foreign object from the surface of the electrode and determine the external area of ​​the foreign object.

[0023] When the area of ​​the foreign object is greater than or equal to the detection value, the control unit can identify the foreign object as a target to be detected.

[0024] The measured value can correspond to the area formed by a horizontal length of 5 mm and a vertical length of 5 mm.

[0025] When the length of the electrode in the moving direction and the length in the perpendicular direction of the moving direction in the inner region of the electrode differ from the design value by more than a boundary value, the control unit can determine that there is a foreign object distributed at the boundary.

[0026] The boundary value can correspond to a length of 3 mm.

[0027] The lighting unit includes: a first lighting unit and a second lighting unit, spaced apart from the moving part and arranged along the moving direction of the electrode; and a third lighting unit and a fourth lighting unit, spaced apart from the moving part and arranged perpendicular to the moving direction of the electrode. The first lighting unit, the second lighting unit, the third lighting unit, and the fourth lighting unit can be connected to form the lighting area.

[0028] The camera unit is provided in multiple locations, and each of the multiple camera units can capture one area of ​​the illuminated area.

[0029] The lighting section may include a lower lighting section, which is spaced downwards from the moving section.

[0030] On the other hand, a battery manufacturing method utilizing a battery manufacturing system comprising a vision device including a moving part for moving an electrode while simultaneously inspecting it via an imaging part includes: a step of moving the electrode via the moving part to position the electrode in an illumination area; a step of capturing an image of the electrode via the imaging part to obtain an image of the electrode; and a step of detecting foreign objects on the surface of the electrode based on the captured image.

[0031] In one embodiment, in the battery manufacturing method according to the present disclosure, the step of detecting foreign objects on the surface of the electrode may include: determining that the foreign object is distributed based on the pixel value of an image of an inner region of the boundary of the surface shape of the electrode obtained from the captured image; and when the foreign object is determined to be distributed, determining the foreign object as a target for detection based on the brightness or contrast of the image of the inner region.

[0032] In one embodiment, in the step of determining that foreign matter is distributed in the battery manufacturing method according to the present disclosure, when the difference between the length of the electrode measured based on the pixel value of the image of the internal region and the design value is above the boundary value, it can be determined that foreign matter is distributed at the boundary.

[0033] In one embodiment, in the step of determining that the foreign object is distributed in the battery manufacturing method according to the present disclosure, based on the pixel value of the image of the internal region, when the pixel value is above a preset reference value, it can be determined that the foreign object is distributed in the internal region.

[0034] In one embodiment, in the step of identifying the foreign object as a target for detection in the battery manufacturing method according to the present disclosure, the size of the foreign object distributed in the internal region or the boundary is calculated based on the brightness or contrast of the image of the internal region. When the calculated size is above a preset detection value or a benchmark value, the foreign object can be identified as a target for detection.

[0035] The effects of the invention

[0036] According to one embodiment of this disclosure, foreign objects present on the electrode surface can be detected at an early stage.

[0037] According to one embodiment of this disclosure, it can be confirmed whether there are foreign objects generated by the electrode manufacturing apparatus on the electrode surface.

[0038] According to one embodiment of this disclosure, it is possible to confirm the presence of foreign matter on the electrode surface before stacking electrodes.

[0039] According to one embodiment of this disclosure, the boundaries of the electrode surface shape can be determined by analyzing captured images.

[0040] According to one embodiment of this disclosure, the location of the foreign object on the electrode surface can be identified.

[0041] According to one embodiment of this disclosure, foreign objects larger than a predetermined size can be detected.

[0042] According to one embodiment of this disclosure, the performance of electrode assemblies manufactured by a battery manufacturing system can be improved.

[0043] According to one embodiment of this disclosure, the performance of battery cells manufactured by the battery manufacturing system can be improved.

[0044] According to one embodiment of this disclosure, the safety of a battery manufacturing system used to manufacture battery cells can be improved. Attached Figure Description

[0045] Figure 1 A battery cell comprising an electrode assembly manufactured by a battery manufacturing system according to an embodiment of the present disclosure is shown in exploded view.

[0046] Figure 2 This illustration shows the process of manufacturing an electrode using an electrode manufacturing apparatus of a battery manufacturing system according to an embodiment of the present disclosure;

[0047] Figure 3A perspective view showing the process of a vision device inspecting electrodes in a battery manufacturing system according to an embodiment of the present disclosure;

[0048] Figure 4 A side view showing the process of a vision device inspecting electrodes in a battery manufacturing system according to an embodiment of the present disclosure;

[0049] Figure 5 A top view showing the process of a vision device inspecting electrodes in a battery manufacturing system according to an embodiment of the present disclosure;

[0050] Figure 6 This illustrates a vision device in a battery manufacturing system according to an embodiment of the present disclosure, which identifies the boundaries of the electrodes.

[0051] Figure 7 The image shown is captured by a vision device of a battery manufacturing system according to an embodiment of the present disclosure, in which foreign objects are distributed at the boundaries of the electrodes.

[0052] Figure 8 The image shown is captured by a vision device of a battery manufacturing system according to an embodiment of the present disclosure, in which foreign objects are distributed in the internal region of the electrode.

[0053] Figure 9 A flowchart illustrating a battery manufacturing method according to an embodiment of the present disclosure;

[0054] Explanation of reference numerals in the attached figures

[0055] 110: Electrode assembly

[0056] 120: Electrode tabs

[0057] 130: Electrode

[0058] 140: Exterior materials

[0059] 210: Mobile Department

[0060] 220: Filming Department

[0061] 230: Lighting Department

[0062] 240: Control Department

[0063] 300: Foreign object

[0064] 410: Detection value

[0065] 430: Boundary

[0066] 450: Boundary value

[0067] 600: Cutting device

[0068] 700: Visual Device Detailed Implementation

[0069] The present disclosure will now be described in detail with reference to the accompanying drawings. However, this is merely an example, and the present disclosure is not limited to the specific embodiments described herein.

[0070] Figure 1 A battery cell comprising an electrode assembly manufactured by a battery manufacturing system according to an embodiment of the present disclosure is shown in exploded view.

[0071] Reference Figure 1 The electrode assembly 110 manufactured by the battery manufacturing system according to an embodiment of the present disclosure can be combined with the outer casing material to form a battery cell.

[0072] The electrode assembly 110 can be configured with one or more positive electrodes and one or more negative electrodes separated by a diaphragm. The diaphragm can be located between the positive and negative electrodes.

[0073] For example, electrode assembly 110 may have a structure in which positive and negative electrodes are alternately stacked and separated by a diaphragm.

[0074] The outer casing 140 can protect internal components such as the electrode assembly 110. For example, the outer casing 140 can be configured to have an external insulating layer, a metal layer, and an internal adhesive layer. The outer casing 140 can be a flexible material such as a membrane.

[0075] The outer casing material 140 may include an upper outer casing material 140a and a lower outer casing material 140b, and a recessed internal space may be formed in at least one of the upper outer casing material 140a and the lower outer casing material 140b. The electrode assembly 110 may be accommodated in the internal space I.

[0076] A sealing portion S can be formed on the outer peripheral surfaces of the upper outer material 140a and the lower outer material 140b. The internal space I containing the electrode assembly 110 can be sealed by the sealing portion S, which is bonded to each other by means of adhesive or the like.

[0077] For example, when the electrode assembly 110 is accommodated in the internal space I of the upper outer material 140a and the lower outer material 140b, sealing portions S can be formed on the four outer peripheral surfaces of the lower outer material 140b that are in contact with the upper outer material 140a.

[0078] Alternatively, sealing portions S can be formed on three outer peripheral surfaces of the lower outer material 140b that connects to the upper outer material 140a, and one outer peripheral surface can be folded. The connection form between the upper outer material 140a and the lower outer material 140b is not limited to the sealing or folding described above.

[0079] Each electrode (positive or negative) in the electrode assembly 110 is provided with an electrode tab 120, and one or more electrode tabs 120 can be connected to electrode leads. The electrode leads are located between the sealing portions S of the upper outer casing material 140a and the lower outer casing material 140b, and are exposed to the outside of the outer casing material 140, thereby functioning as electrode terminals of the battery cell.

[0080] On the other hand, the above-mentioned battery cell is exemplified by a pouched type, but this is only one embodiment. The battery cell can be configured into shapes such as cylindrical, prismatic, etc.

[0081] Figure 2 This illustration shows the process of manufacturing an electrode using an electrode manufacturing apparatus according to an embodiment of the present disclosure. The battery manufacturing system according to the present disclosure can manufacture a single battery cell including an electrode assembly comprising multiple stacked electrodes, and may include an electrode manufacturing apparatus, a vision device, and an electrode assembly assembly.

[0082] The electrode manufacturing apparatus manufactures a plurality of electrodes 130 and may include a grooving device (not shown) for processing electrodes 130 supplied from coiled electrodes 130 and a cutting device 600.

[0083] When the electrode 130 is provided from the coiled electrode as a strip-shaped pre-electrode 130p, the grooving device can cut one end of the strip-shaped pre-electrode 130p to form an electrode tab 120.

[0084] The grooving device can form electrode tabs 120 in the uncoated portion of the electrode 130 where no active material is coated. The strip-shaped pre-electrode 130p can be divided into a portion coated with active material and an uncoated portion where no active material is coated, and the uncoated portion can be located at one end of the electrode 130.

[0085] The grooving device can form the electrode tab 120 by irradiating the uncoated portion with a laser or by applying pressure to a mold structure. The grooving device may include a laser unit to irradiate the uncoated portion with a laser to form the electrode tab 120. The grooving device may include a mold structure to form the electrode tab 120 by applying pressure to the uncoated portion with the mold structure.

[0086] The grooving device can continuously process the uncoated portion formed at one end of the strip-shaped pre-electrode 130p using a laser or a mold structure to form the electrode tab 120.

[0087] Reference Figure 2During the A100 process, the strip-shaped preparatory electrode 130p can be formed into an electrode tab 120 at one end by a grooving device. Before the strip-shaped preparatory electrode 130p is cut at a preset interval by the cutting device 600, the electrode 130 can be formed into an interconnected strip.

[0088] The A100 process forms electrode tabs 120 by machining strip-shaped preparatory electrodes 130p using a grooving device. Therefore, foreign matter that falls off the strip-shaped preparatory electrodes 130p can be generated during the formation of electrode tabs 120. When the electrode manufacturing apparatus passes through a state where foreign matter generated during the A100 process is distributed on the surface of electrode 130, it can be detected by a vision device described later.

[0089] The cutting device 600 can cut the strip-shaped pre-electrode 130p that has passed through the grooving device at preset intervals. The cutting device 600 can cut the strip-shaped pre-electrode 130p into widths with preset intervals.

[0090] The cutting device 600 can cut strip-shaped pre-electrodes 130p continuously formed with electrode tabs 120 so that one electrode 130 forms one electrode tab 120. The cutting device 600 can cut relatively large strip-shaped pre-electrodes 130p to form multiple unit electrodes 130.

[0091] During the A300 process, the strip-shaped pre-electrode 130p, on which electrode tabs 120 are continuously formed, can be cut into multiple unit electrodes 130 by the cutting device 600. During the A300 process, the strip-shaped pre-electrode 130p is processed by the cutting device 600, and therefore foreign matter that falls off the electrodes 130 is generated during the processing. When the electrode manufacturing apparatus passes through a state where foreign matter generated during the A300 process is distributed on the surface of the electrodes 130, it can be detected by the vision device described later.

[0092] Figure 3 A perspective view showing the process of a vision device inspecting electrodes in a battery manufacturing system according to an embodiment of the present disclosure. Figure 4 A side view showing the process of a vision device inspecting electrodes in a battery manufacturing system according to an embodiment of the present disclosure is shown. Figure 5 A top view showing the process of a vision device inspecting electrodes in a battery manufacturing system according to an embodiment of the present disclosure.

[0093] The vision device 700 can photograph the electrode 130, which has been processed by the cutting device 600 to form a unit electrode 130 with an electrode tab 120. The vision device 700 photographs the electrode 130 processed by the cutting device 600 to inspect for foreign objects 300 (see reference). Figure 7The electrode assembly assembly assembles the electrode 130 that has passed through the vision device 700, and the vision device 700 can be formed between the electrode manufacturing apparatus and the electrode assembly assembly.

[0094] That is, the battery manufacturing system according to this disclosure may include: an electrode manufacturing apparatus for manufacturing an electrode 130; and a vision device 700 for inspecting the electrode 130 manufactured by the electrode manufacturing apparatus by moving the electrode 130 by the moving part 210 while the device performs an inspection by the imaging part.

[0095] Additionally, the battery manufacturing system according to this disclosure may also include an electrode assembly apparatus for manufacturing an electrode assembly by stacking electrodes 130 passing through the vision device 700.

[0096] The vision device 700 may include: a moving part 210 that supports and moves the electrode 130; an imaging part 220 located above the moving part 210 and imaging the electrode 130; an illumination part 230 that illuminates the electrode 130; and a control part 240 that determines and detects foreign objects 300.

[0097] The movable part 210 can support the electrode 130 and move the electrode 130 to the shooting point. The movable part 210 can extend from the electrode manufacturing apparatus and can move the multiple electrodes 130 manufactured by the cutting device 600 of the electrode manufacturing apparatus.

[0098] The moving part 210 may include a device, such as a conveyor belt, capable of continuously moving the electrodes 130. The width of the moving part 210 may be smaller than the width of the plurality of electrodes 130 located thereon.

[0099] The width of the plurality of electrodes 130 extending in the vertical direction along the moving direction is greater than the width of the moving portion 210, and they can protrude from the moving portion 210 in the vertical direction of the moving direction. Electrode tabs 120 are formed protruding from one end of the electrode 130 in the vertical direction of the moving direction, and the electrode tabs 120 can be arranged to protrude from the moving portion 210.

[0100] The imaging unit 220 can be positioned above the movable unit 210 and can capture images of the surface of the electrode 130 located at the imaging point. The imaging unit 220 can capture images of the surface of the electrode 130 from above and export the captured images.

[0101] Reference Figure 3 Although multiple imaging units 220 are shown, imaging can also be performed by a single imaging unit 220 depending on its performance. The imaging point of the imaging unit 220 can correspond to the illumination area formed by the illumination unit 230.

[0102] When multiple imaging units 220 are provided, each imaging unit 220 can capture an image of one area of ​​the illuminated area. The multiple images captured by the multiple imaging units 220 can be transmitted to the control unit 240 for the judgment and detection of foreign objects 300.

[0103] Multiple imaging units 220 can simultaneously or sequentially photograph the surface of electrode 130, and multiple photographs can be taken of one electrode 130.

[0104] Multiple imaging units 220 can divide the surface of electrode 130 into imaging areas for imaging. The multiple imaging units 220 can respectively image one end of electrode 130 where electrode tabs 120 are formed and the other end of electrode 130.

[0105] The imaging areas of the multiple imaging units 220 can overlap to capture the surface of the electrode 130 without any omissions. The multiple imaging units 220 can capture images of one end and the other end of the electrode 130, as well as between one end and the other end of the electrode 130.

[0106] The imaging unit 220 can be located above the illumination unit 230, and can take a picture of the surface of the electrode 130 that emits light from the illumination unit 230 from above.

[0107] The lighting unit 230 can illuminate the lighting area. The lighting area can be a region larger than the shooting point and surrounded by the lighting unit 230.

[0108] Reference Figure 3 The lighting unit 230 includes multiple light sources, which can be arranged along the moving direction of the electrode 130 and in a direction perpendicular to the moving direction. Some of the multiple light sources can be arranged perpendicularly to each other and connected to form an illumination area.

[0109] Multiple light sources can be respectively arranged parallel to the edge of electrode 130, so as to the boundary 430 (refer to) formed by the edge of electrode 130. Figure 6 Irradiation light. Multiple light sources can irradiate light onto the boundary 430 of the internal region forming the electrode 130 to help determine whether foreign objects 300 are distributed at the boundary 430. That is, at least a portion of the boundary 430 can be a portion of the region corresponding to the edge of the electrode 130.

[0110] For example, multiple light sources can be formed by a first illumination to a fourth illumination. The illumination section 230 may include: a first illumination and a second illumination, spaced apart from the moving section 210 upwards and arranged along the moving direction of the electrode 130; and a third illumination and a fourth illumination, spaced apart from the moving section 210 upwards and arranged perpendicular to the moving direction of the electrode 130.

[0111] The first and second lighting can be configured to be perpendicular to and interconnected with the third and fourth lighting to form a lighting area. The lighting area can be larger than the area of ​​electrode 130, which is included within the lighting area.

[0112] The illumination unit 230 can be configured such that the length of the light source disposed in the vertical direction along the moving direction is greater than the length of the electrode 130 extending in the vertical direction along the moving direction. Figure 4 In order to be in Figure 3 A cross-sectional view of the lighting section 230 and the electrode 130 cut along line A-A'.

[0113] Reference Figure 4 The length L1 of the light source arranged in the illumination section 230 in the vertical direction of the moving direction can be greater than the length L2 of the electrode 130 extending in the vertical direction of the moving direction.

[0114] The light source with length L1 in the lighting unit 230 is formed by a single light source, and the lighting unit 230 can illuminate light in a direction perpendicular to the direction of movement without forming a shadow.

[0115] Reference Figure 5 The length W1 of the light source arranged along the moving direction in the illumination section 230 can be greater than the length W2 of the electrode 130 extending along the moving direction.

[0116] The light source with length W1 in the lighting unit 230 is formed by a single light source, and the lighting unit 230 can illuminate light along the moving direction without forming a shadow.

[0117] The illumination section 230 is configured to surround the electrode 130, allowing light to be projected onto the entire surface of the electrode 130. (See reference...) Figure 3 Multiple light sources can be connected to form a quadrilateral, but the shape of the lighting unit 230 is not limited to this.

[0118] Additionally, the illumination unit 230 may include a lower illumination unit (not shown) spaced downwards from the moving unit 210. The lower illumination unit can illuminate light from the lower part of the moving unit 210 to help determine the boundary 430 of the electrode 130. In order to avoid directly illuminating the imaging unit 220, the lower illumination unit may be staggered with the imaging point of the imaging unit 220.

[0119] The control unit 240 can control the imaging unit 220 and the moving unit 210, and can analyze the captured images obtained by the imaging unit 220. The control unit 240 can move the electrode 130 by the moving unit 210 so that the electrode 130 is located in the illumination area, and acquire the captured images by the imaging unit 220 when the electrode 130 is located in the illumination area.

[0120] Figure 6 This illustrates a vision device in a battery manufacturing system according to an embodiment of the present disclosure, which identifies the boundaries of the electrodes. Figure 7 The image shown is captured by a vision device of a battery manufacturing system according to an embodiment of the present disclosure, in which foreign objects are distributed at the boundaries of the electrodes. Figure 6 and Figure 7 For the purpose of explaining the control unit 240 pairs Figure 5 A diagram illustrating the process of defining the boundary of region B in the diagram.

[0121] The control unit 240 can analyze the image captured by the imaging unit 220 when the electrode 130 is located in the illumination area to determine and detect foreign objects 300 distributed on the surface of the electrode 130.

[0122] Before judging foreign objects 300 distributed on the surface of electrode 130, control unit 240 can determine the boundary 430 of the surface shape of electrode 130 by analyzing captured images. Control unit 240 can determine the internal region of electrode 130 by determining the boundary 430 of electrode 130.

[0123] Multiple electrodes 130 disposed in the lighting area may be disposed at different angles, so the control unit 240 can determine the boundary 430 of the electrodes 130 before determining whether there is a foreign object 300 distributed there.

[0124] The control unit 240 can determine the boundary 430 of the electrode 130 by analyzing the image captured by the imaging unit 220 in the illumination area, and mark the determined boundary 430 with a line. After the control unit 240 determines the boundary 430, the length and area of ​​the internal region of the electrode 130 corresponding to the interior of the boundary 430 are also determined.

[0125] When the area of ​​the internal region of the electrode 130 measured by defining the boundary 430 is different from the design value of the electrode 130, the control unit 240 can determine whether there are foreign objects 300 distributed on the boundary 430.

[0126] When the length of the inner region of electrode 130 in the moving direction and the length in the perpendicular direction of the moving direction respectively produce boundary values ​​with the design values ​​(indicating that...) Figure 6 When the length corresponding to the reference numeral 450 in the attached drawing (hereinafter referred to as reference numeral 450) is greater than the above, the control unit 240 can determine that there is a foreign object 300 distributed on the boundary 430.

[0127] If foreign objects 300 are distributed on the boundary 430 of electrode 130, control unit 240 may mistake the foreign objects 300 for the boundary 430 of electrode 130. Control unit 240 can determine whether foreign objects 300 are distributed on the boundary 430 by comparing the design value of the internal region of electrode 130 with the measured length of the internal region.

[0128] As an example, the boundary value 450 can correspond to a length of 3 mm. If the measured length of the internal region differs from the designed value of the internal region of the electrode 130 by more than 3 mm, the control unit 240 can determine that there is a foreign object 300 distributed on the boundary 430 of the electrode 130. The boundary value 450 can be set to a predetermined length and is not limited to 3 mm.

[0129] Then, the control unit 240 can determine whether there is a foreign object 300 distributed in the internal region of the electrode 130 corresponding to the interior of the boundary 430 of the electrode 130. The control unit 240 can export an internal region image of the internal region of the electrode 130 and determine whether there is a foreign object 300 distributed in the internal region image.

[0130] The control unit 240 can convert the pixels of the internal region image into numerical values ​​and determine that a foreign object 300 is distributed at a pixel with a value higher than a preset reference value. The pixels of the internal region image can be converted into numerical values ​​representing brightness, color, or luminance, and the location of the foreign object 300 distributed in the internal region of the electrode 130 can be confirmed by comparing it with the reference value.

[0131] If there are no foreign objects 300 distributed on the surface of electrode 130, the pixels of the internal region image can have similar values. The pixels of the internal region image can have a certain value, and the pixels (regions) with foreign objects 300 distributed on them can have values ​​greater than or less than the certain value due to the foreign objects 300. Pixels with foreign objects 300 distributed on them can have values ​​that deviate significantly from the certain value.

[0132] If a pixel, based on the converted numerical value, is greater than or less than a reference value, it can be determined that there is a foreign object 300. Therefore, a pixel is considered to have a foreign object 300 when it is greater than the reference value. In other words, pixels with foreign objects 300 can be identified as having a value greater than the reference value.

[0133] If the foreign object 300 is distributed on the surface of the electrode 130, the pixel values ​​of the foreign object 300 in the internal region image may be larger. The pixels of the internal region image can be converted into values ​​related to brightness or RGB.

[0134] The control unit 240 can filter pixels with values ​​above a reference value from the pixels of the internal region image and determine that a foreign object 300 is distributed at that pixel. The control unit 240 can distinguish the surface of the foreign object 300 and the electrode 130 by adjusting the brightness or contrast of the pixels with values ​​above the reference value, and determine the area of ​​the foreign object 300.

[0135] The control unit 240 can emphasize the outline or shape of the foreign object 300 distributed on the surface of the electrode 130. The control unit 240 can clearly identify the foreign object 300 by adjusting the contrast of pixels with a value higher than a reference value.

[0136] For example, the control unit 240 can distinguish the foreign object 300 from the surface of the electrode 130 by increasing the contrast of pixels with a value higher than a reference value. The control unit 240 can determine the size of the foreign object 300 by understanding its shape.

[0137] If the foreign object 300 is ring-shaped with a closed area and its size can be calculated, the control unit 240 can compare the area of ​​the foreign object 300 with the detection value (indicating...). Figure 7 The area indicated by reference numeral 410 in the attached drawing (hereinafter referred to as reference numeral 410) is used to determine whether it is the object to be detected.

[0138] If the foreign object 300 is not in a ring shape, the control unit 240 can calculate the size of the pixels where the foreign object 300 is distributed, and if it is above a preset reference value (for example, 1200 pixels), it is determined to be a detection object.

[0139] The control unit 240 can distinguish between the foreign object 300 located on the surface of the electrode 130 and the surface of the electrode 130 by adjusting the brightness or contrast of the pixel.

[0140] The control unit 240 can measure the number of pixels or area occupied by the outer surface area of ​​the foreign object 300. If the value is 410 or higher, the foreign object 300 is identified as the object to be detected.

[0141] The measured value 410 corresponds to the area formed by a horizontal length of 5 mm and a vertical length of 5 mm.

[0142] The control unit 240 intends to detect foreign objects 300 that occupy an area greater than or equal to the area formed by a horizontal length of 5 mm and a vertical length of 5 mm, but the shape of the detected foreign object 300 may not be just a square.

[0143] In order to detect foreign objects 300 that may have irregular shapes, the control unit 240 can measure the number or area of ​​pixels including the shape of the foreign object 300. If the number of pixels including the shape of the foreign object 300 is 1200 pixels or more, or if the area is equivalent to or greater than the area formed by a horizontal length of 5 mm and a vertical length of 5 mm, the control unit 240 can determine that the foreign object 300 is an object to be detected.

[0144] Therefore, even if foreign matter 300 is distributed on the surface of electrode 130, if the amount of foreign matter 300 is less than the detection value 410, the control unit 240 may not identify the foreign matter 300 as a target for detection. The control unit 240 may consider foreign matter 300 smaller than the detection value 410 as a factor that does not affect battery performance, and thus determine that no foreign matter 300 is distributed.

[0145] For example, if the difference between the length of the measured internal region of electrode 130 and the design value is less than 3 mm (the boundary value 450), the control unit 240 can determine that no foreign object 300 is distributed on the boundary 430 of electrode 130. If approximately 4 mm of foreign object 300 is distributed on the boundary 430 of electrode 130, the control unit 240 can determine that foreign object 300 is distributed on the boundary 430.

[0146] The boundary 430 can be altered by the foreign object 300, and the inner side of the boundary 430 can be considered as the internal region. If the pixel count of the internal region image is above a reference value, the control unit 240 can determine that the surface of the electrode 130 is covered by the foreign object 300.

[0147] Although the control unit 240 determines that there is a foreign object 300 distributed on the boundary 430, it cannot determine its exact location. Therefore, it can use an image of the internal region inside the boundary 430. As mentioned above, the control unit 240 can confirm the exact location of the foreign object 300 distributed on the boundary 430 by comparing the pixel values ​​of the internal region image with the reference values.

[0148] Even if the control unit 240 confirms the location of the foreign object 300 distributed on the boundary 430, if the measured area of ​​the foreign object 300 is smaller than the area formed by the horizontal length of 5 mm and the vertical length of 5 mm, which is the detection value 410, the foreign object 300 may not be judged as the object to be detected.

[0149] In other words, when the measured area of ​​the foreign object 300 is smaller than the predetermined area used as the detection value 410, the control unit 240 may not identify the foreign object 300 as the object to be detected.

[0150] Reference Figure 6 The control unit 240 is determining the boundary 430 of one edge of the electrode 130, which is in a damaged state. The control unit 240 can determine and define the boundary 430 by analyzing the image captured by the imaging unit 220 of the electrode 130.

[0151] exist Figure 6 In the process, the control unit 240 determines the boundary 430 used to distinguish the internal and external regions of the electrode 130 and marks it with a line. After determining the boundary 430, the control unit 240 can further determine whether there are foreign objects 300 distributed on the boundary 430.

[0152] When the length of the electrode 130 in the moving direction and the length in the vertical direction of the moving direction in the internal region of the electrode 130 differ from the design value by a boundary value of 450 or more, the control unit 240 can determine that there is a foreign object 300 distributed on the boundary 430.

[0153] exist Figure 6 In the process, damage to one edge of electrode 130 can cause the length of the internal region of electrode 130 to differ from the design value. Figure 6 The length of the damaged portion of the edge of the middle electrode 130 is measured to be less than the boundary value 450, so the control unit 240 can determine that there is no foreign object 300 distributed at the boundary 430.

[0154] The control unit 240 can assume the shape of the virtual electrode 130 based on the design values, and continuously confirm the boundary value 450 along the boundary of the virtual electrode 130.

[0155] The control unit 240 can determine the boundary 430 of the electrode 130 by confirming multiple boundary values ​​450.

[0156] Even if the length of the internal region of the electrode 130 is reduced due to damage to the electrode 130, the control unit 240 can still perform measurements, and thus determine whether the difference between the electrode 130 and the design value is within the error range.

[0157] exist Figure 7 In the process, the control unit 240 misjudged the boundary 430 of the electrode 130 due to the presence of foreign objects 300 distributed on the boundary 430. Therefore, the length of the internal region of the electrode 130 measured by the control unit 240 may differ from the design value.

[0158] The control unit 240 can form the boundary 430 of the electrode 130 to be more inward than the actual boundary 430, so that the internal region of the electrode 130 is smaller than the design value of the electrode 130.

[0159] The length of the internal region of electrode 130 measured by control unit 240 can differ from the design value of electrode 130 by a boundary value of more than 450. Figure 7 In the process, the length of the internal region of the electrode 130 measured by the control unit 240 differs from the design value by more than 3 mm from the boundary value 450. Therefore, the control unit 240 can determine that there is a foreign object 300 distributed at the boundary 430.

[0160] Figure 8 The image shown is captured by a vision device of a battery manufacturing system according to an embodiment of the present disclosure, in which foreign objects are distributed in the internal region of the electrode. Figure 8 For control unit 240 to film camera unit 220 Figure 5The process of analyzing images captured in region B.

[0161] The control unit 240 determines that there are no foreign objects 300 distributed on the boundary 430 and determines the state of the boundary 430. The control unit 240 can export an internal region image related to the internal region of the electrode 130 inside the boundary 430 and determine whether there are foreign objects 300 distributed there.

[0162] exist Figure 8 In the electrode 130, multiple foreign objects 300 of different sizes and shapes are distributed in the internal region. The control unit 240 can convert the pixels of the image of the internal region of the electrode 130 into numerical values ​​and determine that foreign objects 300 are distributed at pixels with values ​​above a reference value.

[0163] exist Figure 8 In this process, the control unit 240 can convert the pixels of the image inside the electrode 130 into numerical values ​​and determine that there are four foreign objects 300. The control unit 240 can adjust the brightness or contrast of the pixels of the four foreign objects 300 to determine the external area of ​​the foreign objects 300.

[0164] The four foreign objects 300 can have various shapes such as rings and strips, and the control unit 240 can measure the number of pixels or area occupied by the outer surface area of ​​the foreign object 300.

[0165] If the number of pixels or the area occupied by the foreign object 300 is greater than or equal to the detection value 410, the control unit 240 may determine the foreign object 300 as a target to be detected.

[0166] Control unit 240 can Figure 8 Of the four foreign objects 300 shown, the two foreign objects 300 with values ​​above the benchmark value are identified as objects to be detected, and the other two foreign objects 300 with values ​​below the benchmark value can be ignored.

[0167] The control unit 240 can convert the pixels of the image inside the electrode 130 into numerical values ​​to determine that there are four foreign objects 300 distributed inside the electrode 130. However, it can selectively determine whether a foreign object 300 is a target to be detected based on the area occupied by the foreign object 300.

[0168] The control unit 240 can provide an alert for the foreign object 300 that is identified as a detection target, or initiate an additional process for removing the foreign object 300.

[0169] Figure 9 A flowchart illustrating a battery manufacturing method according to an embodiment of the present disclosure is provided.

[0170] The battery manufacturing method according to this disclosure may include an electrode manufacturing step S100, an electrode moving step S200, an electrode imaging step S300, and a foreign object detection step S400.

[0171] Specifically, the battery manufacturing method according to this disclosure may include: step S100 of manufacturing electrode 130 by electrode manufacturing apparatus, step S200 of moving electrode 130 by moving part 210 to place electrode 130 in illumination area, step S300 of taking a picture of electrode by taking a picture of electrode to obtain a picture image of the pictured electrode, and step S400 of detecting foreign objects on electrode surface based on the picture image.

[0172] In the electrode manufacturing step S100 of the battery manufacturing method according to the present disclosure, a plurality of electrodes 130 may be manufactured by an electrode manufacturing apparatus.

[0173] In the electrode manufacturing step S100 of the battery manufacturing method according to the present disclosure, a plurality of electrodes 130 can be manufactured by the grooving device (not shown) and the cutting device 600 included in the electrode manufacturing apparatus.

[0174] In other words, the electrode manufacturing step S100 may include: forming electrode tabs 120 on a strip pre-electrode 130p supplied from a coiled electrode using a grooving device; and cutting the strip pre-electrode 130p with electrode tabs 120 formed by the grooving device using a cutting device 600 at preset intervals.

[0175] In the electrode moving step S200 of the battery manufacturing method according to the present disclosure, the plurality of electrodes 130 manufactured in the electrode manufacturing step S100 can be moved by the moving part 210 to be located in the illumination area. The illumination area can be formed by the illumination part 230, which may include a plurality of light sources.

[0176] Multiple light sources are respectively arranged parallel to the edges of the electrode 130, which can illuminate the boundary 430 formed by the edges of the electrode 130. The length of the multiple light sources can be greater than the length of each edge of the opposing electrode 130, and they are connected to each other to form an illumination area.

[0177] The electrode moving step S200 can be a preparation step for positioning one of the multiple electrodes 130 in the illumination area by the moving part 210 for imaging electrode 130.

[0178] In the electrode imaging step S300 of the battery manufacturing method according to this disclosure, multiple electrodes 130 can be photographed by the imaging unit 220 to obtain an image. The electrode imaging step S300 can photograph the electrodes 130 located in the illuminated area from above to obtain an image.

[0179] The electrode imaging step S300 can be performed by multiple imaging units 220, and imaging can be performed by a portion of the multiple imaging units 220 depending on the size of the electrode 130.

[0180] After the electrode imaging step S300, the battery manufacturing method according to this disclosure may include a foreign object detection step S400, which detects foreign objects 300 that are in contact with or attached to the electrode from the image captured in the electrode imaging step S300.

[0181] Furthermore, the foreign object detection step S400 may include a boundary judgment step S410 and a foreign object judgment step S430.

[0182] In the boundary determination step S410 of the battery manufacturing method according to this disclosure, the boundary 430 of the surface shape of the electrode 130 can be identified by analyzing the captured image. The boundary determination step S410 can determine the boundary 430 in the captured image that distinguishes the internal region of the electrode 130 from the external region of the electrode 130.

[0183] In the boundary determination step S410 of the battery manufacturing method according to this disclosure, the internal region of the electrode 130, which is inside the boundary 430 of the electrode 130, can be determined by determining the boundary 430 of the electrode 130. The boundary determination step S410 determines the boundary 430 of the electrode 130 by analyzing an image of the electrode 130 captured by the imaging unit 220 in the illumination area, and marks the determined boundary 430 with a line. After determining the boundary 430 in the boundary determination step S410, the length and area of ​​the internal region of the electrode 130 corresponding to the interior of the boundary 430 are also determined.

[0184] The boundary judgment step S410 can be a preparatory step for setting the area for judging the foreign object 300 in the foreign object judgment step S430.

[0185] The foreign object detection step S430 can detect and identify foreign objects 300 distributed on the surface of electrode 130.

[0186] The foreign object detection step S430 may include: a step of determining whether foreign objects 300 are distributed on the surface of electrode 130; and a step of determining whether foreign objects 300 that are determined to be distributed in the above-mentioned detection step are detected.

[0187] In other words, step S400 of the battery manufacturing method according to the present disclosure for detecting foreign objects on the electrode surface may include: step S431 determining that foreign objects 300 are distributed based on the pixel value of the internal region image of the boundary 430 of the electrode 130 surface shape obtained from the captured image; and step S433 determining that foreign objects 300 are to be detected based on the brightness or contrast of the internal region image when it is determined that foreign objects 300 are distributed.

[0188] Specifically, the foreign object determination step S430 of the battery manufacturing method according to the present disclosure may include step S431, which involves exporting an image of an internal region corresponding to the inside of the boundary 430 from the captured image, converting the pixels of the internal region image into numerical values, and determining that foreign objects 300 are distributed at pixels with values ​​above a reference value.

[0189] Then, the foreign object determination step S430 of the battery manufacturing method according to the present disclosure may further include, when it is determined that a foreign object 300 is distributed, adjusting the brightness or contrast of a pixel with a value above a reference value to determine the outer surface area of ​​the foreign object 300, and when the outer surface area of ​​the foreign object 300 is above the detection value 410, determining the foreign object 300 as an object to be detected, step S433.

[0190] More specifically, in step S431 of the battery manufacturing method according to this disclosure, it can be determined whether foreign matter 300 is distributed in the internal region of the electrode 130 corresponding to the interior of the boundary 430 of the electrode 130. If foreign matter 300 is distributed on the surface of the electrode 130, the value of the pixels in the internal region image where foreign matter 300 is distributed can be larger.

[0191] In step S431 of the battery manufacturing method according to the present disclosure, in determining that foreign matter 300 is distributed, pixels with values ​​above a reference value can be selected from the pixels of the internal region image and determined to be foreign matter 300 distributed in that pixel.

[0192] If the foreign object 300 is distributed on the electrode 130, it can be inferred that it is distributed on the boundary 430 of the electrode 130 or in the internal region of the electrode 130.

[0193] In other words, in step S431 of the battery manufacturing method according to the present disclosure, when the difference between the length of the electrode 130 measured based on the pixel value (pixel value or pixel number) of the internal region image and the design value is greater than the boundary value 450, it is determined that there is a foreign object 300 distributed at the boundary 430.

[0194] Specifically, in the boundary determination step S410 of the battery manufacturing method according to the present disclosure, the boundary 430 of the surface shape of the electrode 130 can be determined by analyzing the captured image, and in the step of determining that foreign matter 300 is distributed, it is determined whether the foreign matter 300 is distributed at the boundary 430 of the electrode 130 or in the internal region of the electrode 130.

[0195] In the step of identifying a foreign object 300 as an object to be inspected in the battery manufacturing method according to the present disclosure, a foreign object 300 occupying an area of ​​5 mm in lateral length and 5 mm in vertical length or more can be identified as an object to be inspected.

[0196] In step S433 of the battery manufacturing method according to the present disclosure, when the foreign object 300 has an irregular shape, the foreign object 300 with a number of pixels including the shape of the foreign object 300 of 1200 or more can be identified as the object to be detected.

[0197] In step S431 of the battery manufacturing method according to the present disclosure, when the size of the internal region image differs from the design value by a boundary value of 450 or more, it can be determined that there is a foreign object 300 distributed at the boundary 430.

[0198] In step S431 of the battery manufacturing method according to the present disclosure, it can be determined whether the foreign object 300 is distributed at the boundary 430 of the electrode 130 or in the internal region of the electrode 130.

[0199] In other words, in the step of determining that foreign matter 300 is distributed in the battery manufacturing method according to the present disclosure, when the length of the electrode 130 in the moving direction and the length in the perpendicular direction of the moving direction in the internal region of the electrode 130 differ from the design value by a boundary value of 450 or more, it can be determined that foreign matter 300 is distributed at the boundary 430.

[0200] The boundary value 450 corresponds to a length of 3 mm. In the step of determining that there is a foreign object 300, if the measured length of the internal region differs from the design value of the internal region of the electrode 130 by more than 3 mm, it can be determined that there is a foreign object 300 distributed at the boundary 430 of the electrode 130.

[0201] In contrast, in step S431 of the battery manufacturing method according to the present disclosure, when the pixel value of the internal region image is above a preset reference value, it can be determined that there is a foreign object 300 distributed in the internal region.

[0202] As an example, when the lateral length and vertical length of electrode 130 differ from the design value of electrode 130 by more than 3 mm as the boundary value 450, it can be determined that foreign matter 300 is distributed at the boundary 430 of electrode 130.

[0203] If the foreign object 300 is distributed on the boundary 430 of the electrode 130, the size of the internal region of the electrode 130 can be controlled to be either too small or too large depending on the distribution of the foreign object 300.

[0204] Regarding whether the foreign object 300 is distributed in the internal region of the electrode 130, it can be determined that the foreign object 300 is distributed at the corresponding pixel when the converted value obtained by converting the pixels of the internal region image into numerical values ​​is above a preset reference value.

[0205] In the above judgment process, foreign objects 300 distributed on the boundary 430 of electrode 130 can also be judged as foreign objects by numerical conversion.

[0206] The size of the foreign object 300 can be calculated by adjusting the brightness or contrast of the pixels where the foreign object 300 is distributed.

[0207] In other words, in step S433 of the battery manufacturing method according to the present disclosure, the size of the foreign object 300 distributed in the internal region or boundary 430 can be calculated based on the brightness or contrast of the internal region image. If the calculated size is above the preset detection value 410 or the reference value, the foreign object 300 can be identified as the object to be detected.

[0208] When the foreign object 300 is ring-shaped with a closed area, it can be compared with the detection value 410 to determine whether the foreign object 300 is the object to be detected. When the foreign object 300 is not ring-shaped, it can be compared with the number of pixels used as a preset reference value to replace the detection value to determine whether the foreign object 300 is the object to be detected.

[0209] On the other hand, even if it is determined that the foreign object 300 is distributed in the internal area, the foreign object 300 may not be detected by comparing it with the detection value 410 or the benchmark value.

[0210] Alternatively, if the lateral and vertical lengths of electrode 130 do not differ from the design values ​​of electrode 130 by more than 3 mm from the boundary value 450, it can be determined that the foreign object 300 is not distributed on the boundary 430 of electrode 130. As mentioned above, the distribution and detection of the foreign object 300 can be determined in the same way as when the foreign object 300 is distributed on the boundary 430.

[0211] According to the battery manufacturing method disclosed herein, when the foreign object 300 is detected, a reminder can be issued to the user, or the electrode 130 from which the foreign object 300 is detected can be removed from the moving part 210.

[0212] This disclosure is not limited to the embodiments described above. Combinations of the above embodiments or combinations of at least one of the above embodiments with known technologies may be included in this disclosure as other embodiments.

[0213] Although the present disclosure has been described in detail with reference to specific embodiments, it is obvious that this is only for illustrating the present disclosure and the present disclosure is not limited thereto. Those skilled in the art can make modifications or improvements based on the technical concept of the present disclosure.

[0214] Simple variations and modifications of this disclosure fall within its scope, and the specific scope of protection of this disclosure may be further defined by the appended claims.

Claims

1. A battery manufacturing system, comprising a vision device for inspecting foreign objects located on electrodes. The visual device includes: The movable part supports the electrode and moves the electrode to the shooting point; The imaging unit, located above the moving unit, captures images of the surface of the electrode located at the imaging point; The lighting unit illuminates a lighting area larger than the shooting point; as well as The control unit analyzes the captured image obtained by the imaging unit when the electrode is located in the illumination area in order to determine and detect foreign objects distributed on the surface of the electrode.

2. The battery manufacturing system according to claim 1, wherein: Before determining the presence of foreign objects on the surface of the electrode, the control unit analyzes the captured images to determine the boundaries of the surface shape of the electrode.

3. The battery manufacturing system according to claim 2, wherein: The lighting unit includes multiple light sources. The plurality of light sources are arranged along the moving direction of the electrode and the direction perpendicular to the moving direction to illuminate the boundary.

4. The battery manufacturing system according to claim 3, wherein: In the illumination unit, the length of the light source disposed in the direction perpendicular to the moving direction is greater than the length of the electrode extending in the direction perpendicular to the moving direction.

5. The battery manufacturing system according to claim 2, wherein: The control unit extracts an internal region image of the electrode's internal region corresponding to the interior of the boundary from the captured image, and determines whether the foreign object is distributed in the internal region image.

6. The battery manufacturing system according to claim 5, wherein: The control unit converts the pixels of the internal region image into numerical values ​​and determines that the foreign object is distributed at pixels with values ​​above a reference value.

7. The battery manufacturing system according to claim 6, wherein: The control unit distinguishes the foreign object from the surface of the electrode and determines the external area of ​​the foreign object by adjusting the brightness or contrast of pixels with values ​​above the reference value.

8. The battery manufacturing system according to claim 7, wherein: When the area of ​​the foreign object is greater than or equal to the detection value, the control unit determines the foreign object as an object to be detected.

9. The battery manufacturing system according to claim 8, wherein: The measured value corresponds to the area formed by a horizontal length of 5 mm and a vertical length of 5 mm.

10. The battery manufacturing system according to claim 2, wherein: When the length of the electrode in the moving direction and the length in the perpendicular direction of the moving direction in the inner region of the electrode differ from the design value by more than a boundary value, the control unit determines that there is a foreign object distributed at the boundary.

11. The battery manufacturing system according to claim 10, wherein: The boundary value corresponds to a length of 3 mm.

12. The battery manufacturing system according to claim 3, wherein, The lighting unit includes: A first illumination and a second illumination are spaced apart from the moving part and arranged along the moving direction of the electrode; and The third and fourth illuminations are spaced apart from the moving part at the upper part and are arranged perpendicular to the moving direction of the electrode. The first, second, third, and fourth lights are connected to form the lighting area.

13. The battery manufacturing system according to claim 1 or 2, wherein: The camera unit is equipped with multiple cameras. Each of the multiple shooting units captures one area of ​​the illuminated area.

14. The battery manufacturing system according to claim 1 or 2, wherein: The lighting section includes a lower lighting section, which is spaced downwards from the moving section.

15. A battery manufacturing method, the battery manufacturing method utilizing a battery manufacturing system including a vision device comprising an electrode moved by a moving part and inspected by an imaging part, wherein, The battery manufacturing method includes: The step of moving the electrode by the moving part to place the electrode in the lighting area; The step of capturing an image of the electrode by means of the imaging unit; and The step of detecting foreign objects on the surface of the electrode based on the captured image.

16. The battery manufacturing method according to claim 15, wherein, The step of detecting foreign objects on the surface of the electrode includes: The step of determining the presence of foreign matter based on the pixel values ​​of the image of the inner region of the boundary of the surface shape of the electrode obtained from the captured image; and When it is determined that the foreign object is distributed, the step of determining the foreign object as the object to be detected based on the brightness or contrast of the image of the internal region.

17. The battery manufacturing method according to claim 16, wherein: In the step of determining that the foreign object is distributed, if the difference between the length of the electrode measured based on the pixel value of the image of the internal region and the design value is above the boundary value, it is determined that the foreign object is distributed at the boundary.

18. The battery manufacturing method according to claim 17, wherein: In the step of determining that the foreign object is distributed, based on the pixel value of the image of the internal region, if the pixel value is above a preset benchmark value, it is determined that the foreign object is distributed in the internal region.

19. The battery manufacturing method according to claim 18, wherein: In the step of identifying the foreign object as the object to be detected... The size of the foreign object distributed in the internal region or the boundary is calculated based on the brightness or contrast of the image of the internal region. When the calculated size is above a preset detection value or a benchmark value, the foreign object is identified as the object to be detected.

Images