A visual inspection method and device for the encapsulation status of cylindrical battery cells

Abstract

The present invention relates to the field of visual inspection, and provides a method and device for visual inspection of the rubber coating state of cylindrical battery cells. By obtaining a cylindrical battery cell image captured by a camera and obtaining the grayscale value of each pixel in the cylindrical battery cell image, the pixel points in the first grayscale interval are screened out, and the area where the tape extends outward relative to the cylindrical battery cell is obtained; wherein, the first grayscale interval is a preset grayscale value range of the area where the tape extends outward relative to the cylindrical battery cell; if the number of pixel points in the first grayscale interval reaches a first preset number, it is determined that the cylindrical battery cell is rubber coated. Automatic detection of the rubber coating state of the cylindrical battery cell is achieved and the detection standards are unified, so that the rubber coating state of the cylindrical battery cell can be detected quickly and effectively, and the rubber coating quality of the cylindrical battery cell is guaranteed to be consistent.

Description

Technical Field

[0001] The present invention relates to the field of visual inspection, and in particular to a method and device for visually inspecting the encapsulation state of a cylindrical battery cell. Background Art

[0002] Nowadays, when producing cylindrical battery cells, it is necessary to use a rubber coating machine to coat the cylindrical battery cells with rubber. After the rubber coating is completed, the rubber coating status of the cylindrical battery cells needs to be tested.

[0003] In existing technology, quality inspectors typically visually inspect the encapsulation condition of cylindrical battery cells. However, prolonged manual inspections can lead to fatigue, reduced inspection efficiency, and distraction, resulting in the risk of missed inspections and impacting battery production efficiency. Furthermore, different quality inspectors employ varying inspection standards, resulting in varying levels of encapsulation quality across the entire production cycle. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a method and device for visually inspecting the encapsulation state of cylindrical battery cells, which can quickly and effectively detect the encapsulation state of cylindrical battery cells, so that the encapsulation quality of the produced cylindrical battery cells is consistent.

[0005] In order to achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows:

[0006] In a first aspect, the present invention provides a method for visually inspecting the encapsulation state of a cylindrical battery cell, the method comprising:

[0007] Get the cylindrical battery cell image captured by the camera;

[0008] Obtaining the grayscale value of each pixel in the cylindrical battery cell image, filtering out the pixels within a first grayscale interval, and obtaining the area where the tape extends outward relative to the cylindrical battery cell; wherein the first grayscale interval is a preset grayscale value range of the area where the tape extends outward relative to the cylindrical battery cell;

[0009] If the number of pixels in the first grayscale range reaches a first preset number, it is determined that the cylindrical battery cell is encapsulated with glue.

[0010] In an optional embodiment, the method further comprises:

[0011] Obtaining the grayscale value of each pixel in the first area of ​​the cylindrical battery cell image, filtering out the pixels in the second grayscale range, and obtaining a background area;

[0012] The horizontal length of the first area is smaller than the horizontal length of the area where the tape extends outward from the cylindrical battery cell, and the height of the first area is greater than the height of the area where the tape extends outward from the cylindrical battery cell;

[0013] Obtain edge points between the area where the tape extends outward from the cylindrical battery core and the background area, and perform straight line fitting on the edge points;

[0014] If there is only one fitting straight line obtained, and the inclination angle of the fitting straight line satisfies the first preset angle, then the lagging finishing is determined to be qualified; otherwise, the lagging finishing is determined to be unqualified.

[0015] In an optional embodiment, the method further comprises:

[0016] When it is determined that the encapsulation is qualified, the height distance between the fitting straight line and the edge line of the adjacent cylindrical battery cell end is obtained;

[0017] Calculating the height of the tape extending outward relative to the end of the cylindrical battery cell based on the height distance and pre-stored pixel accuracy;

[0018] When the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is within a preset height range, it is determined that the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is qualified.

[0019] In an optional embodiment, the method further comprises:

[0020] When it is determined that the cylindrical battery cell is covered with rubber, the area where the tape extends outward from the cylindrical battery cell is divided into a plurality of vertical column areas;

[0021] The vertical heights of the plurality of vertical column regions are obtained, and when all of the vertical heights are within a preset vertical height range, it is determined that the lagging is qualified.

[0022] In an optional embodiment, the method further comprises:

[0023] When the lagging finish is determined to be qualified, obtaining the average vertical height of the plurality of vertical column areas;

[0024] Calculating the height of the tape extending outward relative to the end of the cylindrical battery cell based on the average vertical height and the pre-stored pixel accuracy;

[0025] When the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is within a preset height range, it is determined that the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is qualified.

[0026] In an optional embodiment, the method further comprises:

[0027] When it is determined that the cylindrical battery cell is not coated with glue, the coating finish is unqualified, or the height of the tape extending outward from the end of the cylindrical battery cell is unqualified, the coating information of the corresponding cylindrical battery cell is fed back to the controller, and the controller adjusts the coating process parameters according to the received coating information.

[0028] In a second aspect, the present invention provides a visual inspection device for the encapsulation state of a cylindrical battery cell, the visual inspection device for the encapsulation state of a cylindrical battery cell comprising:

[0029] The receiving module is used to obtain the cylindrical battery cell images captured by the camera;

[0030] an acquisition module, configured to acquire the grayscale value of each pixel in the cylindrical battery cell image, filter out the pixels within a first grayscale interval, and obtain the area where the tape extends outward relative to the cylindrical battery cell; wherein the first grayscale interval is a preset grayscale value range of the area where the tape extends outward relative to the cylindrical battery cell;

[0031] The determination module is configured to determine that the cylindrical battery cell is encapsulated with glue if the number of pixels in the first grayscale interval reaches a first preset number.

[0032] In an optional embodiment, the acquisition module is further configured to: acquire the grayscale value of each pixel in the first area of ​​the cylindrical battery cell image, filter out the pixels in the second grayscale range, and obtain a background area; wherein the horizontal length of the first area is less than the horizontal length of the area where the tape extends outward from the cylindrical battery cell, and the height of the first area is greater than the height of the area where the tape extends outward from the cylindrical battery cell;

[0033] The determination module is further used to: obtain edge points between the area where the tape extends outward from the cylindrical battery cell and the background area, and perform straight line fitting on the edge points; if only one fitting straight line is obtained and the inclination angle of the fitting straight line meets a first preset angle, then the rubber wrapping finishing is determined to be qualified; if not, then the rubber wrapping finishing is determined to be unqualified.

[0034] In an optional embodiment, the determination module is also used to: when it is determined that the rubber wrapping is qualified, obtain the height distance between the fitting straight line and the edge line of the adjacent cylindrical battery cell end; calculate the height of the tape extending outward relative to the cylindrical battery cell end based on the height distance and the pre-stored pixel accuracy, and when the height of the tape extending outward relative to the cylindrical battery cell end is within a preset height range, determine that the height of the tape extending outward relative to the cylindrical battery cell end is qualified.

[0035] In an optional embodiment, the determination module is also used to: when it is determined that the cylindrical battery cell is coated with rubber, divide the area where the tape extends outward from the cylindrical battery cell into multiple vertical column areas, obtain the vertical heights of each of the multiple vertical column areas, and when all of the vertical heights are within a preset vertical height range, determine that the rubber coating is qualified.

[0036] The embodiments of the present invention provide a method and device for visually inspecting the adhesive coating status of cylindrical battery cells. By acquiring an image of the cylindrical battery cell captured by a camera and obtaining the grayscale value of each pixel in the image, the method and device screen out the pixels within a first grayscale interval to obtain the area where the tape extends outward from the cylindrical battery cell. The first grayscale interval is a preset grayscale value range for the area where the tape extends outward from the cylindrical battery cell. If the number of pixels within the first grayscale interval reaches a first preset number, the cylindrical battery cell is determined to be coated with adhesive. This method automatically detects the adhesive coating status of cylindrical battery cells and unifies the inspection standards, enabling rapid and effective inspection of the adhesive coating status of cylindrical battery cells and ensuring consistent adhesive coating quality across the cylindrical battery cells.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of a scenario provided by an embodiment of the present invention is shown;

[0040] Figure 2 A block diagram of an electronic device provided by an embodiment of the present invention is shown;

[0041] Figure 3 A schematic diagram showing a flow chart of a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention;

[0042] Figure 4 An example diagram showing a method for visually inspecting the encapsulation status of a cylindrical battery cell provided by an embodiment of the present invention;

[0043] Figure 5 Another schematic flow chart of a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention is shown;

[0044] Figure 6 Another exemplary diagram shows a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention;

[0045] Figure 7 Another schematic flow chart of a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention is shown;

[0046] Figure 8 Another schematic flow chart of a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention is shown;

[0047] Figure 9 Another exemplary diagram shows a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention;

[0048] Figure 10 Another schematic flow chart of a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention is shown;

[0049] Figure 11 A functional module diagram of a device for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention is shown.

[0050] Icons: 110 - bus; 120 - processor; 130 - memory; 150 - I / O module; 170 - communication interface; 300 - visual inspection device for the encapsulation status of cylindrical battery cells; 310 - receiving module; 330 - acquisition module; 350 - determination module; 370 - adjustment module. DETAILED DESCRIPTION

[0051] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0053] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0054] Please refer to Figure 1 , is an example scene diagram provided by an embodiment of the present invention, which includes a camera, a battery, and a backlight panel. The camera is a 5-megapixel camera with a 16mm lens mounted on it. The distance between the lens and the battery is 416mm, and the field of view is 120×100mm. The battery is a cylindrical cell to be inspected after encapsulation. A white backlight panel is placed below the battery, serving as a background to assist in inspecting the encapsulation status of the cylindrical cell.

[0055] The camera is connected to the electronic device, which controls the camera to take pictures of the cylindrical battery cells and detects the encapsulation status of the cylindrical battery cells based on the pictures of the cylindrical battery cells. Figure 2 , is a block diagram of an electronic device provided by an embodiment of the present invention. The electronic device includes a bus 110, a processor 120, a memory 130, an I / O module 150, and a communication interface 170.

[0056] The bus 110 may be a circuit that connects the above elements to each other and transfers communications (eg, control messages) between the above elements.

[0057] The processor 120 may receive commands from the other components (eg, the memory 130 , the I / O module 150 , the communication interface 170 , etc.) via the bus 110 , may interpret the received commands, and may perform calculations or data processing according to the interpreted commands.

[0058] The processor 120 can be an integrated circuit chip with signal processing capabilities. The processor 120 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0059] The memory 130 may store commands or data received from the processor 120 or other elements (eg, the I / O module 150 , the communication interface 170 , etc.) or commands or data generated by the processor 120 or other elements.

[0060] The memory 130 can be, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), or an electrically erasable programmable read-only memory (EEPROM).

[0061] The I / O module 150 can receive commands or data input from the user via input-output means (e.g., sensors, keyboards, touch screens, etc.), and can transmit the received commands or data to the processor 120 or the memory 130 via the bus 110. It is also used to display various information (e.g., multimedia data, text data) received, stored, and processed by the above components, and can display videos, images, data, etc. to the user.

[0062] The communication interface 170 may be used to communicate signaling or data with other node devices.

[0063] It is understandable that Figure 2 The structure shown is only a schematic diagram of the structure of the electronic device. The electronic device may also include Figure 2 More or fewer components than shown, or with Figure 2 Different configurations shown. Figure 2 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0064] The above-mentioned electronic device will be used as the execution subject to execute each step of each method provided in the embodiment of the present invention and achieve corresponding technical effects.

[0065] See also Figure 3 , Figure 3 It is a flow chart of a method for visually inspecting the encapsulation status of cylindrical battery cells provided by an embodiment of the present invention.

[0066] Step S202, obtaining a cylindrical battery cell image captured by a camera;

[0067] In this embodiment, after the encapsulating machine encapsulates the cylindrical battery cell, the camera takes a picture of the encapsulated cylindrical battery cell to capture a picture of the cylindrical battery cell.

[0068] Step S204: obtaining the grayscale value of each pixel in the cylindrical battery cell image, filtering out the pixels in a first grayscale interval, and obtaining the area where the tape extends outward relative to the cylindrical battery cell; wherein the first grayscale interval is a preset grayscale value range of the area where the tape extends outward relative to the cylindrical battery cell;

[0069] In this embodiment, the collected cylindrical battery cell image is a grayscale image, and the grayscale value of the pixel in the grayscale image ranges from 0 to 255, which can reflect the depth of the color. For example, a grayscale value of 0 represents black, and a grayscale value of 255 represents white.

[0070] It is understandable that the cylindrical cell is opaque and the tape is translucent, and the grayscale value ranges corresponding to these two are different. Therefore, a grayscale value range of the area where the tape extends outward from the cylindrical cell can be pre-set, namely a first grayscale range. Based on the grayscale values ​​of each pixel in the cylindrical cell image, the pixels within the first grayscale range are filtered out to obtain the area where the tape extends outward from the cylindrical cell.

[0071] Step S206: If the number of pixels in the first grayscale range reaches a first preset number, it is determined that the cylindrical battery cell is encapsulated with plastic;

[0072] In this embodiment, the number of pixels whose grayscale values ​​fall within a first grayscale range is counted, and based on this number, it is determined whether the cylindrical battery cell is encapsulated with rubber. If this number reaches a first preset number, i.e., is greater than or equal to the first preset number, then the cylindrical battery cell is determined to be encapsulated with rubber. If this number does not reach the first preset number, i.e., is less than the first preset number, then the cylindrical battery cell is determined to be unencapsulated with rubber.

[0073] For ease of understanding, the present invention provides an example diagram. Figure 4 , Figure 4 The cylindrical battery cell in (a) is not encapsulated. Figure 4 The cylindrical battery cell in (b) is encapsulated with rubber.

[0074] Based on the above steps, by acquiring an image of the cylindrical cell captured by a camera and obtaining the grayscale value of each pixel in the image, the pixels within the first grayscale interval are screened out to determine the area where the tape extends outward from the cylindrical cell. The first grayscale interval is a preset grayscale value range for the area where the tape extends outward from the cylindrical cell. If the number of pixels within the first grayscale interval reaches a first preset number, the cylindrical cell is determined to be encapsulated. This achieves automatic detection of the encapsulation status of cylindrical cells and unifies the detection standards, enabling rapid and effective detection of the encapsulation status of cylindrical cells and ensuring consistent encapsulation quality across the entire cell.

[0075] Optionally, the embodiment of the present invention also provides a method for detecting whether the lagging is qualified. Figure 5, which includes the following steps:

[0076] Step S208A, obtaining the grayscale value of each pixel in the first area of ​​the cylindrical battery cell image, screening out the pixels in the second grayscale range, and obtaining the background area;

[0077] The horizontal length of the first area is smaller than the horizontal length of the area where the tape extends outward relative to the cylindrical battery core, and the height of the first area is greater than the height of the area where the tape extends outward relative to the cylindrical battery core.

[0078] In this embodiment, the tape is translucent and the backlight is white, and the grayscale value ranges corresponding to the two are different. Therefore, a grayscale value range corresponding to the backlight, i.e., a second grayscale range, can be pre-set. Based on the grayscale values ​​of each pixel in the first area of ​​the cylindrical battery cell image, the pixels in the second grayscale range are selected to obtain the background area.

[0079] Step S210A, obtaining edge points between the area where the tape extends outward from the cylindrical battery cell and the background area, and performing straight line fitting on the edge points;

[0080] Step S212A: If the obtained fitting straight line is one and the inclination angle of the fitting straight line satisfies the first preset angle, it is determined that the lagging finishing is qualified; if not, it is determined that the lagging finishing is unqualified;

[0081] In this embodiment, based on the obtained background area, edge points between the background area and the area where the tape extends outward from the cylindrical battery cell are obtained, and straight line fitting is performed on the edge points.

[0082] If a fitted straight line is obtained, the boundary line of the area where the tape extends outward from the cylindrical cell is obtained, and the inclination angle of the fitted straight line is determined. If the inclination angle meets the first preset angle, the laminating is judged to be qualified; if the inclination angle does not meet the first preset angle, the laminating is judged to be unqualified.

[0083] For ease of understanding, the present invention provides an example diagram. Figure 6 , where the area formed by the white border is the first area, the black border is the background area, the inclination angle of the fitting straight line meets the first preset angle, and the encapsulation of the cylindrical battery cell is qualified.

[0084] Optionally, when the above steps determine that the laminating is qualified, the embodiment of the present invention provides a method for detecting whether the height of the tape extending outward relative to the end of the cylindrical battery cell is qualified. Please refer to Figure 7 , which includes the following steps:

[0085] Step S214A, when it is determined that the encapsulation is qualified, obtaining the height distance between the fitting straight line and the edge line of the adjacent cylindrical battery cell end;

[0086] Step S216A, calculating the height of the tape extending outward relative to the end of the cylindrical battery cell based on the height distance and pre-stored pixel accuracy;

[0087] Step S218A: When the height of the tape extending outward relative to the end of the cylindrical battery cell is within a preset height range, determine that the height of the tape extending outward relative to the end of the cylindrical battery cell is qualified.

[0088] In this embodiment, pixel precision refers to the physical size of an object corresponding to one pixel. For example, if an image is composed of 1000*500 pixels, and the actual size of the image is 100mm*50mm, then the pixel precision is 100mm / 1000=0.1mm / px, where the unit is pixel millimeter. In other words, the physical size of the object corresponding to one pixel is 0.1mm.

[0089] When the encapsulation is qualified, the height distance between the fitting straight line and the edge line of the adjacent cylindrical battery cell end can be obtained, and the height of the tape extending outward relative to the cylindrical battery cell end can be calculated based on the height distance and the pre-stored pixel accuracy.

[0090] If the height of the tape extending outward relative to the end of the cylindrical battery cell is within the preset height range, the height of the tape extending outward relative to the end of the cylindrical battery cell is determined to be qualified; if the height of the tape extending outward relative to the end of the cylindrical battery cell is not within the preset height range, the height of the tape extending outward relative to the end of the cylindrical battery cell is determined to be unqualified.

[0091] Optionally, the embodiment of the present invention also provides another implementation method for detecting whether the lagging is qualified, please refer to Figure 8 , which includes the following steps:

[0092] Step S208B: if it is determined that the cylindrical battery cell is covered with adhesive, divide the area where the adhesive tape extends outward from the cylindrical battery cell into a plurality of vertical column areas;

[0093] Step S210B: obtaining the vertical heights of the plurality of vertical column regions. When all the vertical heights are within a preset vertical height range, it is determined that the laminating is qualified.

[0094] In this embodiment, when it is determined that the cylindrical battery cell is covered with rubber, the area where the tape extends outward from the cylindrical battery cell can be divided into multiple vertical column areas. For example, the area where the tape extends outward from the cylindrical battery cell can be divided into multiple vertical column areas according to a preset width value; then the vertical heights of each of the multiple vertical column areas are obtained. If all the vertical heights are within the preset vertical height range, it is determined that the rubber coating is qualified. If there is a vertical height that is not within the preset vertical height range, it is determined that the rubber coating is unqualified.

[0095] For ease of understanding, the present invention provides an example diagram. Figure 9 , divide the area where the tape extends outward from the cylindrical battery cell into three vertical column areas, namely area A, area B and area C, and obtain the vertical heights h1, h2 and h3 of these three vertical column areas. If h2 and h3 are not within the preset vertical height range, the cylindrical battery cell's encapsulation finish is unqualified.

[0096] Optionally, when the above steps determine that the laminating is qualified, the embodiment of the present invention also provides a method for detecting whether the height of the tape extending outward relative to the end of the cylindrical battery cell is qualified. Please refer to Figure 10 , which includes the following steps:

[0097] Step S214B, when it is determined that the lagging is qualified, obtaining the average vertical height of the plurality of vertical column areas;

[0098] Step S216B, calculating the height of the tape extending outward relative to the end of the cylindrical battery cell based on the average vertical height and pre-stored pixel accuracy;

[0099] Step S218B: When the height of the tape extending outward relative to the end of the cylindrical battery cell is within a preset height range, determine that the height of the tape extending outward relative to the end of the cylindrical battery cell is qualified.

[0100] In this embodiment, when it is determined that the encapsulation is qualified, the average vertical height of multiple vertical column areas is obtained, and the height of the tape extending outward relative to the end of the cylindrical battery cell is calculated based on the average vertical height and the pre-stored pixel accuracy.

[0101] If the height of the tape extending outward relative to the end of the cylindrical battery cell is within the preset height range, the height of the tape extending outward relative to the end of the cylindrical battery cell is determined to be qualified; if the height of the tape extending outward relative to the end of the cylindrical battery cell is not within the preset height range, the height of the tape extending outward relative to the end of the cylindrical battery cell is determined to be unqualified.

[0102] Optionally, in the process of detecting the encapsulation status of the cylindrical battery cell based on the above steps, when it is determined that the cylindrical battery cell is not encapsulated with glue, the encapsulation finish is unqualified, or the height of the tape extending outward from the end of the cylindrical battery cell is unqualified, the encapsulation information of the corresponding cylindrical battery cell is fed back to the controller, and the controller adjusts the encapsulation process parameters according to the received encapsulation information.

[0103] In this embodiment, when it is detected that the cylindrical battery cell is not coated with glue, or the coating finish is unqualified, or the height of the tape extending outward relative to the end of the cylindrical battery cell is unqualified, it means that the coating quality of the cylindrical battery cell is unqualified. The coating information of the cylindrical battery cell can be obtained and fed back to the controller, so that the controller can adjust the coating process parameters according to the received coating information.

[0104] For example, the encapsulation process parameters may include the position of the tape and the adhesive pull mechanism. The tape's position determines whether the cylindrical cell is encapsulated and the height of the tape's extension relative to the cell. The tape's position and the adhesive pull mechanism's position determine the direction of adhesive pull. Based on the received encapsulation information, the controller adjusts the tape and adhesive pull mechanism positions to improve encapsulation quality.

[0105] In order to perform the corresponding steps in the above embodiments and various possible methods, the following provides a method for implementing a visual inspection device for the encapsulation state of cylindrical battery cells. Figure 11 , Figure 11 This is a functional module diagram of a device 300 for visually inspecting the encapsulation state of a cylindrical battery cell provided in an embodiment of the present invention. It should be noted that the basic principles and technical effects of the device 300 for visually inspecting the encapsulation state of a cylindrical battery cell provided in this embodiment are the same as those of the above-mentioned embodiments. For the sake of simplicity, for any parts not mentioned in this embodiment, please refer to the corresponding contents of the above-mentioned embodiments. The device 300 for visually inspecting the encapsulation state of a cylindrical battery cell includes:

[0106] The receiving module 310 is used to obtain the cylindrical battery cell image captured by the camera;

[0107] An acquisition module 330 is configured to obtain the grayscale value of each pixel in the cylindrical battery cell image, filter out the pixels within a first grayscale interval, and obtain the area where the tape extends outward from the cylindrical battery cell. The first grayscale interval is a preset grayscale value range for the area where the tape extends outward from the cylindrical battery cell.

[0108] The determination module 350 is configured to determine that the cylindrical battery cell is encapsulated with plastic if the number of pixels in the first grayscale range reaches a first preset number.

[0109] Optionally, the acquisition module 330 is further configured to: acquire the grayscale value of each pixel in the first area of ​​the cylindrical battery cell image, filter out the pixels in the second grayscale range, and obtain the background area; wherein the horizontal length of the first area is smaller than the horizontal length of the area where the tape extends outward from the cylindrical battery cell, and the height of the first area is greater than the height of the area where the tape extends outward from the cylindrical battery cell;

[0110] The determination module 350 is also used to: obtain the edge points between the area where the tape extends outward relative to the cylindrical battery cell and the background area, and perform straight line fitting on the edge points; if the obtained fitting straight line is one and the inclination angle of the fitting straight line meets the first preset angle, it is determined that the rubber wrapping finishing is qualified; if not, it is determined that the rubber wrapping finishing is unqualified.

[0111] Optionally, the determination module 350 is also used to: when it is determined that the wrapping finish is qualified, obtain the height distance between the fitting straight line and the edge line of the adjacent cylindrical battery cell end; calculate the height of the tape extending outward relative to the cylindrical battery cell end based on the height distance and the pre-stored pixel accuracy, and when the height of the tape extending outward relative to the cylindrical battery cell end is within a preset height range, determine that the height of the tape extending outward relative to the cylindrical battery cell end is qualified.

[0112] Optionally, the determination module 350 is also used to: when it is determined that the cylindrical battery cell is coated with rubber, divide the area where the tape extends outward from the cylindrical battery cell into multiple vertical column areas, obtain the vertical heights of each of the multiple vertical column areas, and determine that the rubber coating is qualified when all the vertical heights are within the preset vertical height range.

[0113] Optionally, the determination module 350 is also used to: obtain the average vertical height of multiple vertical column areas when it is determined that the rubber encapsulation is qualified; calculate the height of the tape extending outward relative to the end of the cylindrical battery cell based on the average vertical height and the pre-stored pixel accuracy; when the height of the tape extending outward relative to the end of the cylindrical battery cell is within a preset height range, determine that the height of the tape extending outward relative to the end of the cylindrical battery cell is qualified.

[0114] Optionally, the visual inspection device 300 for the rubber coating status of cylindrical battery cells further includes an adjustment module 370, which is used to feed back the rubber coating information of the corresponding cylindrical battery cell to the controller when it is determined that the cylindrical battery cell is not rubber coated, the rubber coating finish is unqualified, or the height of the tape extending outward relative to the end of the cylindrical battery cell is unqualified, and the controller adjusts the rubber coating process parameters according to the received rubber coating information.

[0115] An embodiment of the present invention further provides an electronic device, including a processor 120 and a memory 130. The memory 130 stores a computer program. When the processor executes the computer program, the visual detection method of the encapsulation state of the cylindrical battery cell disclosed in the above embodiment is implemented.

[0116] An embodiment of the present invention further provides a storage medium having a computer program stored thereon. When the computer program is executed by the processor 120, the method for visually inspecting the encapsulation state of a cylindrical battery cell disclosed in an embodiment of the present invention is implemented.

[0117] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the devices, methods, and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or part of the code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, as well as the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified functions or actions, or can be implemented using a combination of dedicated hardware and computer instructions.

[0118] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0119] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0120] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for visually inspecting the encapsulation state of cylindrical battery cells, characterized in that: include: Get the cylindrical battery cell image captured by the camera; Obtaining the grayscale value of each pixel in the cylindrical battery cell image, filtering out the pixels within a first grayscale interval, and obtaining the area where the tape extends outward relative to the cylindrical battery cell; wherein the first grayscale interval is a preset grayscale value range of the area where the tape extends outward relative to the cylindrical battery cell; If the number of pixels in the first grayscale range reaches a first preset number, it is determined that the cylindrical battery cell is encapsulated with plastic; When it is determined that the cylindrical battery cell is covered with rubber, the area where the tape extends outward from the cylindrical battery cell is divided into a plurality of vertical column areas; The vertical heights of the plurality of vertical column regions are obtained, and when all of the vertical heights are within a preset vertical height range, it is determined that the lagging is qualified.

2. The visual inspection method for the encapsulation state of cylindrical battery cells according to claim 1 is characterized in that: The method also includes: Obtaining the grayscale value of each pixel in the first area of ​​the cylindrical battery cell image, filtering out the pixels in the second grayscale range, and obtaining a background area; The horizontal length of the first area is smaller than the horizontal length of the area where the tape extends outward from the cylindrical battery cell, and the height of the first area is greater than the height of the area where the tape extends outward from the cylindrical battery cell; Obtain edge points between the area where the tape extends outward from the cylindrical battery core and the background area, and perform straight line fitting on the edge points; If there is only one fitting straight line obtained, and the inclination angle of the fitting straight line satisfies the first preset angle, then the lagging finishing is determined to be qualified; otherwise, the lagging finishing is determined to be unqualified.

3. The visual inspection method for the encapsulation state of cylindrical battery cells according to claim 2, characterized in that: The method also includes: When it is determined that the encapsulation is qualified, the height distance between the fitting straight line and the edge line of the adjacent cylindrical battery cell end is obtained; Calculating the height of the tape extending outward relative to the end of the cylindrical battery cell based on the height distance and pre-stored pixel accuracy; When the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is within a preset height range, it is determined that the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is qualified.

4. The visual inspection method for the encapsulation state of cylindrical battery cells according to claim 1, characterized in that: The method also includes: When the lagging finish is determined to be qualified, obtaining the average vertical height of the plurality of vertical column areas; Calculating the height of the tape extending outward relative to the end of the cylindrical battery cell based on the average vertical height and the pre-stored pixel accuracy; When the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is within a preset height range, it is determined that the height of the adhesive tape extending outward relative to the end of the cylindrical battery cell is qualified.

5. The visual inspection method for the encapsulation state of a cylindrical battery cell according to any one of claims 1 to 4, characterized in that: The method also includes: When it is determined that the cylindrical battery cell is not coated with glue, the coating finish is unqualified, or the height of the tape extending outward from the end of the cylindrical battery cell is unqualified, the coating information of the corresponding cylindrical battery cell is fed back to the controller, and the controller adjusts the coating process parameters according to the received coating information.

6. A visual inspection device for the encapsulation status of cylindrical battery cells, characterized in that: The visual inspection device for the encapsulation status of cylindrical battery cells includes: The receiving module is used to obtain the cylindrical battery cell images captured by the camera; an acquisition module, configured to acquire the grayscale value of each pixel in the cylindrical battery cell image, filter out the pixels within a first grayscale interval, and obtain the area where the tape extends outward relative to the cylindrical battery cell; wherein the first grayscale interval is a preset grayscale value range of the area where the tape extends outward relative to the cylindrical battery cell; a determination module, configured to determine that the cylindrical battery cell is encapsulated if the number of pixels in the first grayscale interval reaches a first preset number; The determination module is also used to: when it is determined that the cylindrical battery cell is covered with rubber, divide the area where the tape extends outward from the cylindrical battery cell into multiple vertical column areas, obtain the vertical heights of each of the multiple vertical column areas, and determine that the rubber covering is qualified when all of the vertical heights are within a preset vertical height range.

7. The visual inspection device for the encapsulation state of cylindrical battery cells according to claim 6, characterized in that: The acquisition module is further configured to: acquire the grayscale value of each pixel in the first area of ​​the cylindrical battery cell image, filter out the pixels in the second grayscale range, and obtain a background area; wherein the horizontal length of the first area is less than the horizontal length of the area where the tape extends outward from the cylindrical battery cell, and the height of the first area is greater than the height of the area where the tape extends outward from the cylindrical battery cell; The determination module is further used to: obtain edge points between the area where the tape extends outward from the cylindrical battery cell and the background area, and perform straight line fitting on the edge points; if only one fitting straight line is obtained and the inclination angle of the fitting straight line meets a first preset angle, then the rubber wrapping finishing is determined to be qualified; if not, then the rubber wrapping finishing is determined to be unqualified.

8. The visual inspection device for the encapsulation state of cylindrical battery cells according to claim 7, characterized in that: The determination module is further used to: when it is determined that the rubber wrapping is qualified, obtain the height distance between the fitting straight line and the edge line of the adjacent cylindrical battery cell end; calculate the height of the tape extending outward relative to the cylindrical battery cell end according to the height distance and the pre-stored pixel accuracy, and when the height of the tape extending outward relative to the cylindrical battery cell end is within a preset height range, determine that the height of the tape extending outward relative to the cylindrical battery cell end is qualified.

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