Boundary Detection Device and Method

Abstract

The boundary line detection apparatus and method according to an embodiment of the present invention acquire a first electrode image and a second electrode image having different brightness values of the same electrode that are photographed, and based on the pixel coordinate information of the boundary line of the plain part acquired from the first electrode image, detect the final boundary line of the plain part from the second electrode image, so that the detection accuracy of the boundary line can be improved.

Description

Technical Field

[0001] This application claims the benefit of the filing dates of Korean Patent Application No. 10-2022-0109764, filed with the Korean Intellectual Property Office on August 31, 2022, and Korean Patent Application No. 10-2023-0103920, filed with the Korean Intellectual Property Office on August 9, 2023, and all of the contents disclosed in the documents of the Korean patent applications are incorporated herein.

[0002] The present invention relates to a boundary line detection apparatus and method, and more particularly, to a boundary line detection apparatus and method for detecting a boundary line of a plain area on an electrode image.

Background Art

[0003] As the price of energy sources increases due to the depletion of fossil fuels and the interest in environmental pollution grows, the demand for secondary batteries as an environmentally friendly alternative energy source is rapidly increasing.

[0004] Among secondary batteries, lithium batteries are applied to many industrial fields such as mobile application devices, automobiles, robots, and energy storage devices as a countermeasure against current environmental regulations and high crude oil prices.

[0005] Such lithium batteries are generally classified into cylindrical, prismatic, or pouch types according to the shape of the exterior material that houses the electrode assembly.

[0006] Among these, cylindrical batteries are provided in a form in which the electrode assembly is inserted into the inside of a battery can together with an electrolytic solution.

[0007] The electrodes constituting the electrode assembly can be divided into an electrode part, which is a region coated with a positive electrode and a negative electrode active material, and a plain area (an uncoated part, a non-coated part), which is a region where the electrode is not coated.

[0008] Generally, the electrodes are cut to a certain size according to the size of the battery can during the slitting process.

[0009] At this time, in order to measure the widths of the electrode part and the non-patterned part region of the electrode inserted into the battery can and cut the electrode uniformly, it is necessary to clearly detect the boundary line (Edge) that divides the electrode part and the non-patterned part region.

[0010] Conventional boundary line detection devices adjust the exposure value of the camera so that the brightness pixel value (Gray Value) of the non-patterned part becomes 255, and detect the boundary line of the non-patterned part based on the electrode image captured by the corresponding camera.

[0011] More specifically, a conventional boundary line detection device detects at least one pixel having a brightness value with a difference greater than or equal to a threshold value with respect to the brightness value of a single pixel of the non-patterned part as the boundary line from the electrode image.

[0012] However, according to the conventional boundary line detection device, when setting the brightness pixel value (Gray Value) of the non-patterned part, the position of the boundary line on the electrode image may be distorted and different from the position of the actual boundary line. Therefore, the conventional boundary line detection device has the disadvantage of misdetecting the boundary line and reducing the measurement accuracy.

Summary of the Invention

Problems to be Solved by the Invention

[0013] An object of the present invention for solving the above problems is to provide a boundary line detection device.

[0014] Another object of the present invention for solving the above problems is to provide a boundary line detection method.

[0015] Still another object of the present invention for solving the above problems is to provide a boundary line detection system.

Means for Solving the Problems

[0016] A boundary line detection device for detecting a boundary line of a plain area inside a battery electrode according to an embodiment of the present invention for achieving the above object includes a memory and a processor that executes at least one instruction stored in the memory. The at least one instruction includes an instruction to acquire a first electrode image and a second electrode image in which the same electrode located at the same point is photographed, an instruction to detect pixel information of temporary boundary lines on both sides of the plain area in the electrode from the first electrode image, and an instruction to detect final boundary lines on both sides of the plain area from the second electrode image based on the pixel information.

[0017] At this time, the first electrode image may be an image photographed by adjusting the exposure value of the camera so that the pixel brightness value of the plain area in the first electrode image becomes a preset first threshold value.

[0018] Further, the second electrode image may be an image photographed by adjusting the exposure value of the camera so that the pixel brightness value of the plain area in the second electrode image becomes a second threshold value different from the first threshold value.

[0019] On the other hand, the instruction to detect the pixel information of the temporary boundary line may include an instruction to detect a temporary boundary line located on both sides of the plain area on the first electrode image and an instruction to acquire the pixel coordinate information of the temporary boundary line.

[0020] Here, the instruction to detect the temporary boundary line may include an instruction to detect a first temporary boundary line located on one side of the plain area on the first electrode image using a differential mask filter and an instruction to detect a second temporary boundary line located on the other side of the plain area on the first electrode image using the differential mask filter.

[0021] For example, the differential mask filter may be a Sobel filter.

[0022] On the one hand, the instruction to detect the final boundary line can include an instruction to identify the pixel coordinate information of the first temporary boundary line and the second temporary boundary line, and to obtain a first virtual boundary line and a second virtual boundary line located at the same point as the first temporary boundary line and the second temporary boundary line on the second electrode image, and an instruction to set a first inspection area and a second inspection area based on the first virtual boundary line and the second virtual boundary line respectively, and to detect a first final boundary line and a second final boundary line from the first inspection area and the second inspection area respectively.

[0023] Here, the instruction to detect the first final boundary line and the second final boundary line can include an instruction to detect, as the first final boundary line, a pixel having the maximum value among the gray scale differences between adjacent pixels within the first inspection area, and an instruction to detect, as the second final boundary line, a pixel having the maximum value among the gray scale differences between adjacent pixels within the second inspection area.

[0024] A boundary line detection method for detecting a boundary line of a plain area inside a battery electrode according to another embodiment of the present invention for achieving the above object includes steps of obtaining a first electrode image and a second electrode image in which the same electrode located at the same point is photographed, detecting pixel information of temporary boundary lines on both sides of the plain area inside the electrode from the first electrode image, and detecting final boundary lines on both sides of the plain area from the second electrode image based on the pixel information.

[0025] At this time, the first electrode image may be an image photographed by adjusting the exposure value of the camera so that the pixel brightness value of the plain area within the first electrode image becomes a preset first threshold value.

[0026] Alternatively, the second electrode image may be an image captured by adjusting the exposure value of the camera so that the pixel brightness value of the plain area in the second electrode image becomes a second threshold value different from the first threshold value.

[0027] On the other hand, the step of detecting the pixel information of the temporary boundary line may include a step of detecting a temporary boundary line located on both sides of the plain area on the first electrode image, and a step of obtaining the pixel coordinate information of the temporary boundary line.

[0028] Here, the step of detecting the temporary boundary line may include a step of detecting a first temporary boundary line located on one side of the plain area on the first electrode image using a differential mask filter, and a step of detecting a second temporary boundary line located on the other side of the plain area on the first electrode image using the differential mask filter.

[0029] For example, the differential mask filter may be a Sobel filter.

[0030] On the other hand, the step of detecting the final boundary line may include a step of identifying the pixel coordinate information of the first temporary boundary line and the second temporary boundary line, and obtaining a first virtual boundary line and a second virtual boundary line located at the same point as the first temporary boundary line and the second temporary boundary line on the second electrode image, and setting a first inspection area and a second inspection area based on the first virtual boundary line and the second virtual boundary line respectively, and detecting a first final boundary line and a second final boundary line from the first inspection area and the second inspection area respectively.

[0031] Here, the step of detecting the first final boundary line and the second final boundary line may include detecting, as the first final boundary line, a pixel having the maximum value among the gray scale differences between adjacent pixels within the first inspection region, and detecting, as the second final boundary line, a pixel having the maximum value among the gray scale differences between adjacent pixels within the second inspection region.

[0032] A boundary line detection system for detecting a boundary line of a plain area inside a battery electrode according to another embodiment of the present invention for achieving the above object includes a camera that adjusts exposure values to photograph the same electrode located at the same point with different brightnesses to generate a first electrode image and a second electrode image, and a boundary line detection device that acquires the first electrode image and the second electrode image from the camera, detects pixel information of temporary boundary lines on both sides of the plain area in the electrode from the first electrode image, and detects final boundary lines on both sides of the plain area from the second electrode image based on the pixel information.

Advantages of the Invention

[0033] The boundary line detection device and method according to the embodiment of the present invention as described above can improve the detection accuracy of the boundary line by acquiring a first electrode image and a second electrode image having different brightness values of the same electrode photographed, and detecting the final boundary line of the plain area from the second electrode image based on the pixel coordinate information of the boundary line of the plain area acquired from the first electrode image.

Brief Description of the Drawings

[0034]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0035] Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but should be understood to include all modifications, equivalents or alternatives included in the spirit and technical scope of the present invention. Similar reference numerals are used for similar components while explaining each drawing.

[0036] Terms such as first, second, A, B, etc. can be used to describe various components, but the above components should not be limited by the above terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the rights of the present invention, the first component can be named the second component, and similarly the second component can be named the first component. The term "and / or" includes a combination of a plurality of related items described or one of a plurality of related items described.

[0037] When a component is referred to as being "coupled" or "connected" to another component, it should be understood that it may be directly coupled or connected to the other component, or there may be other components in between. In contrast, when a component is referred to as being "directly coupled" or "directly connected" to another component, it should be understood that there are no other components in between.

[0038] The terms used in this application are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0039] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains. Terms defined as in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted as having an ideal or overly formal meaning unless clearly defined in this application.

[0040] FIG. 1 is an electrode image of a general boundary line detection device.

[0041] Referring to FIG. 1, the electrodes applied to the cylindrical battery can be divided into a roll bonding region, an electrode portion, and a plain portion.

[0042] More specifically, the roll bonding region may be a region that bonds to the roll of the cylindrical battery, and the electrode portion may be a region coated with the electrode active materials of the negative electrode and the positive electrode. Further, the plain portion may be a region where no electrode is coated.

[0043] In the slitting process, the widths of the electrode portion and the plain portion are calculated so that the same battery specifications are formed, and the electrodes can be cut so as to be constantly applied within the error range.

[0044] Therefore, in order to calculate the widths of the electrode portion and the plain portion, it is necessary to clearly detect the boundaries between the roll bonding region, the electrode portion region, and the plain portion region. In other words, it is necessary to clearly detect the boundaries on both sides of the plain portion.

[0045] A general boundary line detection device detects the boundary of the plain portion based on the electrode image acquired from the camera.

[0046] At this time, the exposure value of the camera can be preset so that the brightness pixel value (Gray Value) of the plain portion on the electrode image has a specific value. Thereby, a general boundary line detection device detects, as the boundary line, the pixels corresponding to the preset threshold brightness value on the electrode image.

[0047] More specifically, a conventional boundary line detection device can detect the boundary line of the plain portion based on the electrode image taken by adjusting the exposure value so that the brightness pixel value (Gray Value) of the plain portion becomes 255 by the camera.

[0048] Figure 2 is a graph showing the change in the position of the boundary line according to the brightness value setting of a general boundary line detection device.

[0049] Referring to Figure 2, a general boundary line detection device detects, as the boundary line, the pixels corresponding to the preset threshold brightness value based on the electrode image.

[0050] However, general boundary detection devices have the drawback that when the saturation value is changed due to, for example, a change in the composition of the insulating liquid, resetting of the threshold value for detecting the boundary of the plain area is required.

[0051] As a result, general boundary detection devices have the drawback that they misdetect the boundary position of the plain area, resulting in a decrease in accuracy when measuring the widths of the electrode area and the plain area.

[0052] In addition, in general boundary detection devices, the position of the boundary of the plain area can change due to a change in the threshold brightness value.

[0053] For example, when the threshold brightness value is defined as 50, the difference in position between the boundary detected by a general boundary detection device and the actual boundary is about 3.6 pixels.

[0054] As another example, when the threshold brightness value is defined as 100, the difference in position between the boundary detected by a general boundary detection device and the actual boundary is about 4 pixels.

[0055] As still another example, when the threshold brightness value is defined as 150, the difference in position between the boundary detected by a general boundary detection device and the actual boundary is about 5 pixels.

[0056] The present invention has been devised to solve such technical problems, and by using a first electrode image and a second electrode image taken with different brightness values by adjusting the exposure of a camera, the boundary of the plain area is detected, and the accuracy of the boundary can be improved.

[0057] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

[0058] FIG. 3 is a block diagram of a boundary detection system according to an embodiment of the present invention.

[0059] Referring to FIG. 3, the boundary line detection system can include a camera 1000 and a boundary line detection device 5000.

[0060] More specifically, the camera 1000 can be installed at the site where the electrode process is in progress. In other words, the camera 1000 can be fixedly installed on the equipment where a plurality of electrodes are sequentially moved. Thereby, the camera 1000 can obtain a plurality of electrode images by individually photographing the plurality of electrodes passing through the equipment.

[0061] On the other hand, a plurality of cameras 1000 can be provided. More specifically, the camera 1000 can include a first camera 1100 and a second camera 1500 that photograph the same location.

[0062] The first camera 1100 and the second camera 1500 can have different exposure values.

[0063] According to the embodiment, the exposure value of the first camera 1100 can be preset such that the pixel brightness value of the plain part corresponds to the first threshold value. Thereby, the first camera 1100 can photograph a plurality of electrodes passing through a specific location and obtain at least one first electrode image. For example, the first threshold value may be 255.

[0064] Also, the exposure value of the second camera 1500 can be preset such that the pixel brightness value of the plain part corresponds to the second threshold value. Thereby, the second camera 1500 can photograph a plurality of electrodes passing through a specific location and obtain at least one second electrode image. For example, the second threshold value may be 200.

[0065] In other words, the first electrode image and the second electrode image may be images of the same electrode at the same location.

[0066] The boundary line detection device 5000 can, in conjunction with at least one camera 1000, acquire a first electrode image and a second electrode image from the camera 1000. However, the boundary line detection device 5000 is not limited thereto, and at least one first electrode image and a second electrode image can be acquired through various routes.

[0067] Thereafter, the boundary line detection device 5000 can detect a temporary boundary line based on the first electrode image, and detect a final boundary line based on the detected temporary boundary line. As a result, the boundary line detection device 5000 according to the embodiment of the present invention improves the boundary line detection accuracy of the plain part, and enables precise measurement of the widths of the plain part and the electrode part. The configuration of the boundary line detection device 5000 will be described in more detail with reference to FIG. 4 below.

[0068] FIG. 4 is a block diagram of a boundary line detection device according to an embodiment of the present invention.

[0069] Referring to FIG. 4, to describe the boundary line detection device 5000 according to the embodiment of the present invention in more detail by component, the boundary line detection device can include a memory 100, a processor 200, a transceiver 300, an input interface device 400, an output interface device 500, and a storage device 600.

[0070] According to the embodiment, each component 100, 200, 300, 400, 500, 600 included in the boundary line detection device is connected by a bus 700 and can communicate with each other.

[0071] Among the above components 100, 200, 300, 400, 500, 600, the memory 100 and the storage device 600 can be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 100 and the storage device 600 can be composed of at least one of a read only memory (ROM) and a random access memory (RAM).

[0072] Among these, the memory 100 can include at least one instruction executed by the processor 200.

[0073] According to an embodiment, the at least one instruction includes an instruction to obtain a first electrode image and a second electrode image of the same electrode located at the same location, an instruction to detect pixel information of temporary boundary lines on both sides of the blank portion in the electrode from the first electrode image, and an instruction to detect final boundary lines on both sides of the blank portion from the second electrode image based on the pixel information.

[0074] At this time, the first electrode image may be an image captured by adjusting the exposure value of the camera so that the pixel brightness value of the blank portion region in the first electrode image becomes a preset first threshold value.

[0075] Also, the second electrode image may be an image captured by adjusting the exposure value of the camera so that the pixel brightness value of the blank portion region in the second electrode image becomes a second threshold value different from the first threshold value.

[0076] On the other hand, the instruction to detect the pixel information of the temporary boundary line can include an instruction to detect a temporary boundary line located on both sides of the blank portion region on the first electrode image, and an instruction to obtain the pixel coordinate information of the temporary boundary line.

[0077] Here, the instruction to detect the temporary boundary line can include an instruction to detect a first temporary boundary line located on one side of the blank portion region on the first electrode image using a differential mask filter, and an instruction to detect a second temporary boundary line located on the other side of the blank portion region on the first electrode image using the differential mask filter.

[0078] For example, the differential mask filter may be a Sobel filter.

[0079] On the other hand, the instruction to detect the final boundary line may include an instruction to identify the pixel coordinate information of the first temporary boundary line and the second temporary boundary line, and to obtain a first virtual boundary line and a second virtual boundary line located at the same point as the first temporary boundary line and the second temporary boundary line on the second electrode image, and an instruction to set a first inspection region and a second inspection region based on the first virtual boundary line and the second virtual boundary line respectively, and to detect a first final boundary line and a second final boundary line from the first inspection region and the second inspection region respectively.

[0080] Here, the instruction to detect the first final boundary line and the second final boundary line may include an instruction to detect, as the first final boundary line, a pixel having the maximum value among the differences in gray scale between adjacent pixels within the first inspection region, and an instruction to detect, as the second final boundary line, a pixel having the maximum value among the differences in gray scale between adjacent pixels within the second inspection region.

[0081] On the other hand, the processor 200 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which the method according to the embodiment of the present invention is performed.

[0082] As described above, the processor 200 can execute at least one program command stored in the memory 100.

[0083] FIG. 5 is a flowchart of a boundary line detection method using the boundary line detection device according to an embodiment of the present invention, and FIG. 6 is a conceptual diagram of the boundary line detection method according to an embodiment of the present invention.

[0084] Referring to FIGS. 5 and 6, the boundary line detection device 5000 can acquire a first electrode image (A) and a second electrode image (B) (S1000).

[0085] As described above, the first electrode image (A) and the second electrode image (B) may be images of the same electrode located at the same point.

[0086] At this time, the pixel brightness value of the plain area in the first electrode image (A) may be a preset first threshold value, and the pixel brightness value of the plain area in the second electrode image (B) may be a preset second threshold value.

[0087] Thereafter, the boundary line detection device 5000 can detect a temporary boundary line using the first electrode image (A) (S3000).

[0088] More specifically, the boundary line detection device 5000 can detect a first temporary boundary line (L1) and a second temporary boundary line (L2). Here, the first temporary boundary line (L1) may be a boundary line located on one side of the plain area on the first electrode image (A), and the second temporary boundary line (L2) may be a boundary line located on the other side of the plain area on the first electrode image (A). In other words, the first temporary boundary line (L1) may be a boundary line located between the roll (Roll) bonding region and the plain area region, and the second temporary boundary line (L2) may be a boundary line located between the plain area region and the electrode portion.

[0089] According to an embodiment, the boundary line detection device 5000 can detect the first temporary boundary line (L1) and the second temporary boundary line (L2) by a differential mask filter. For example, the differential mask filter may be a Sobel filter.

[0090] For example, the boundary line detection device 5000 can acquire the pixel coordinate information of the first temporary boundary line (L1) and the second temporary boundary line (L2) from the first electrode image (A) by using the Sobel filter disclosed in the following [Equation 1] and [Equation 2].

[0091]

Equation

[0092] Gx: x-direction partial differential mask

Equation

[0093] Gy: y-direction partial differential mask Thereafter, the boundary line detection device 5000 can detect the final boundary line from the second electrode image (B) based on the pixel coordinate information of the first temporary boundary line (L1) and the second temporary boundary line (L2) detected from the first electrode image (A) (S5000).

[0094] FIG. 7 is a flowchart for explaining a method of detecting a final boundary line among the boundary line detection methods according to an embodiment of the present invention.

[0095] Referring to FIG. 7, the boundary line detection device 5000 can acquire a virtual boundary line from the second electrode image (B) (S5100). Here, the virtual boundary line (L1, L2 in FIG. 6(B)) may be a boundary line corresponding to the pixel coordinate information of the first temporary boundary line (L1 in FIG. 6(A)) and the second temporary boundary line (L2 in FIG. 6(A)) acquired based on the first electrode image (A).

[0096] Thereafter, the boundary line detection device 5000 can set an inspection region for detecting the final boundary line based on the first virtual boundary line and the second virtual boundary line in the second electrode image (B) (S5300).

[0097] According to the embodiment, the inspection area can include a first inspection area and a second inspection area. The first inspection area may be an area having a predetermined interval (D) in the left and right directions as shown in FIG. 6 based on the first virtual boundary line.

[0098] Also, the second inspection area may be an area having a predetermined interval (D) in the left and right directions respectively based on the second virtual boundary line. For example, the predetermined interval (D) may be 40 Pixels.

[0099] Thereafter, the boundary line detection device 5000 can obtain the final boundary lines (FL1, FL2) using the gray scale difference within the first inspection area and the second inspection area (S5500).

[0100] More specifically, the boundary line detection device 5000 can obtain a first final boundary line (FL1) having the maximum value among the gray scale differences within the first inspection area based on the first virtual boundary line.

[0101] Also, the boundary line detection device 5000 can obtain a second final boundary line (FL2) having the maximum value among the gray scale differences within the inspection area based on the second virtual boundary line.

[0102] Thereby, the boundary line detection device of the present invention can be used when detecting the width of the blank part and the electrode part area in the electrode by obtaining the final boundary lines (FL1, FL2) of the blank part from the second electrode image.

[0103] FIG. 8 is an image showing the pixel coordinates of the second final boundary line of the boundary line detection device according to the experimental example of the present invention.

[0104] Referring to FIG. 8, when the pixel coordinates where the actual boundary line on the second electrode image is located are 5392 pixels, it can be confirmed that the error of the final boundary line measured by the boundary line detection device according to the experimental example of the present invention is within 2 pixels.

[0105] As described above, the boundary line detection device and method according to the embodiments of the present invention have been described.

[0106] The boundary line detection device and method according to the embodiments of the present invention acquire a first electrode image and a second electrode image having different brightness values of the same electrode being photographed, and based on the pixel coordinate information of the boundary line of the plain part obtained from the first electrode image, detect the final boundary line of the plain part from the second electrode image, so that the detection accuracy of the boundary line can be improved. The operations of the methods according to the embodiments and experimental examples of the present invention can be embodied as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. In addition, the computer-readable recording medium can be distributed to a computer system connected by a network, and a computer-readable program or code can be stored and executed in a distributed manner.

[0107] In addition, the computer-readable recording medium can include a hardware device specially configured to store and execute program instructions, such as a read-only memory (ROM), a random access memory (RAM), a flash memory, etc. The program instructions can include not only machine language code generated by a compiler but also high-level language code that can be executed by a computer using an interpreter or the like.

[0108] Some aspects of the present invention have been described in the context of an apparatus, which can also be described by a corresponding method, where a block or apparatus corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method can be represented by corresponding blocks or items or features of a corresponding apparatus. Some or all of the method steps can be performed by (or with) a hardware apparatus such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, one or more of the most important method steps can be performed by such an apparatus.

[0109] As described above with reference to the preferred embodiments of the present invention, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the present invention described in the following claims.

Description of Reference Numerals

[0110] 1000: Camera 5000: Boundary Detection Device 100: Memory 200: Processor 300: Transceiver 400: Input Interface Device 500: Output Interface Device 600: Storage Device 700: Bus

Claims

1. An apparatus for detecting a boundary line of a plain area inside a battery electrode, comprising: a memory; and a processor that executes at least one instruction stored in the memory, wherein the at least one instruction includes an instruction to acquire a first electrode image and a second electrode image of the same electrode located at the same point, an instruction to detect pixel information of temporary boundary lines on both sides of the plain area in the first electrode image, and an instruction to detect final boundary lines on both sides of the plain area from the second electrode image based on the pixel information, the boundary line detection apparatus.

2. The first electrode image is an image captured by adjusting an exposure value of a camera such that a pixel brightness value of a plain area in the first electrode image becomes a preset first threshold value, the boundary line detection apparatus according to claim 1.

3. The second electrode image is an image captured by adjusting an exposure value of a camera such that a pixel brightness value of a plain area in the second electrode image becomes a second threshold value different from the first threshold value, the boundary line detection apparatus according to claim 2.

4. The instruction to detect the pixel information of the temporary boundary lines includes an instruction to detect temporary boundary lines located on both sides of the plain area on the first electrode image, and an instruction to acquire pixel coordinate information of the temporary boundary lines, the boundary line detection apparatus according to claim 1.

5. The instruction to detect the temporary boundary lines includes an instruction to detect a first temporary boundary line located on one side of the plain area on the first electrode image using a differential mask filter, and an instruction to detect a second temporary boundary line located on the other side of the plain area on the first electrode image using the differential mask filter, the boundary line detection apparatus according to claim 4.

6. The differential mask filter is a Sobel filter, the boundary line detection apparatus according to claim 5.

7. The instruction to detect the final boundary lines includes an instruction to identify pixel coordinate information of the first temporary boundary line and the second temporary boundary line, and acquire a first virtual boundary line and a second virtual boundary line located at the same point as the first temporary boundary line and the second temporary boundary line on the second electrode image, and A boundary line detection device according to claim 1, comprising instructions for setting a first inspection region and a second inspection region with respect to the first virtual boundary line and the second virtual boundary line respectively, and detecting a first final boundary line and a second final boundary line from the first inspection region and the second inspection region respectively.

8. The instructions for detecting the first final boundary line and the second final boundary line are: Instructions for detecting, as the first final boundary line, a pixel having the maximum value among the differences in gray scale between adjacent pixels within the first inspection region, and A boundary line detection device according to claim 7, comprising instructions for detecting, as the second final boundary line, a pixel having the maximum value among the differences in gray scale between adjacent pixels within the second inspection region.

9. A method for detecting a boundary line of a plain area inside a battery electrode, comprising: The step of acquiring a first electrode image and a second electrode image of the same electrode located at the same point; The step of detecting pixel information of temporary boundary lines on both sides of the plain area within the electrode from the first electrode image; and A boundary line detection method, comprising the step of detecting final boundary lines on both sides of the plain area from the second electrode image based on the pixel information.

10. The first electrode image is: An image taken by adjusting the exposure value of the camera so that the pixel brightness value of the plain area within the first electrode image becomes a preset first threshold value, according to the boundary line detection method of claim 9.

11. The second electrode image is: An image taken by adjusting the exposure value of the camera so that the pixel brightness value of the plain area within the second electrode image becomes a second threshold value different from the first threshold value, according to the boundary line detection method of claim 10.

12. The step of detecting the pixel information of the temporary boundary line is: The step of detecting temporary boundary lines located on both sides of the plain area on the first electrode image; and A boundary line detection method according to claim 9, comprising the step of acquiring the pixel coordinate information of the temporary boundary line.

13. The step of detecting the temporary boundary line is: The step of detecting a first temporary boundary line located on one side of the plain area on the first electrode image using a differential mask filter; and The boundary line detection method according to claim 12, comprising the step of detecting a second temporary boundary line located on the other side of the blank area on the first electrode image by using the differential mask filter.

14. The boundary line detection method according to claim 13, wherein the differential mask filter is a Sobel filter.

15. The step of detecting the final boundary line includes: identifying the pixel coordinate information of the first temporary boundary line and the second temporary boundary line, and obtaining a first virtual boundary line and a second virtual boundary line located at the same point as the first temporary boundary line and the second temporary boundary line on the second electrode image; and setting a first inspection area and a second inspection area based on the first virtual boundary line and the second virtual boundary line respectively, and detecting a first final boundary line and a second final boundary line from the first inspection area and the second inspection area respectively. The boundary line detection method according to claim 9.

16. The step of detecting the first final boundary line and the second final boundary line includes: detecting, as the first final boundary line, a pixel having the maximum value among the gray scale differences between adjacent pixels in the first inspection area; and detecting, as the second final boundary line, a pixel having the maximum value among the gray scale differences between adjacent pixels in the second inspection area. The boundary line detection method according to claim 15.

17. A system for detecting a boundary line of a blank area inside a battery electrode, comprising: a camera that adjusts exposure values to photograph the same electrode located at the same point with different brightnesses to generate a first electrode image and a second electrode image; and a boundary line detection device that acquires the first electrode image and the second electrode image from the camera, detects pixel information of temporary boundary lines on both sides of the blank area in the electrode from the first electrode image, and detects final boundary lines on both sides of the blank area from the second electrode image based on the pixel information. Boundary line detection system.

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