Method and system for optimizing edge cutting position of soft package battery based on machine vision identification

Abstract

The invention discloses a method and system for optimizing the edge cutting position of a soft package battery based on machine vision recognition, and relates to the technical field of edge cutting positioning of soft package batteries. The side sealing edge thickness data and the side sealing gap thickness data can be obtained by processing the image data obtained by shooting in the extending direction of the side sealing edge to be cut, the inner side positioning reference of the side sealing edge is determined by comparing the side sealing edge thickness data with the side sealing gap thickness data, and the outer side positioning reference of the side sealing edge is further determined. And the cutter mechanism is controlled to cut the side sealing edge along the outer side positioning reference, so that the edge sealing width can meet the expected edge sealing width. The edge cutting position of the sealing edge of the soft package battery is identified and positioned through machine vision, and the problem that the sealing area is insufficient or too wide is avoided, so that the sealing performance of the soft package battery is improved, the occupied space of the soft package battery is reduced, and the quality and the market recognition degree are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soft package battery edge cutting positioning, and particularly relates to a method and system for optimizing soft package battery edge cutting position based on machine vision recognition. BACKGROUND

[0002] The edge sealing, edge cutting and edge folding of the aluminum-plastic film soft package battery are three key steps of the core packaging process, which together ensure the sealing integrity, safety and dimensional accuracy of the battery.

[0003] Among them, the battery cell is placed in the folded or upper and lower aluminum-plastic film bag, and the edge of the aluminum-plastic film is heat-pressed by a heat sealer to form a primary edge sealing. Usually, the edge sealing will reserve a liquid injection port, and the width of the edge sealing will also reserve a certain amount. After the processes of liquid injection, formation, exhaust, secondary sealing, etc. are completed, the excess aluminum-plastic film material outside the edge sealing area is cut off by using a precise cutting knife along the edge profile of the battery, but the necessary width of the edge sealing for maintaining sealing is left. After cutting the edge, in order to enhance the mechanical strength and resistance to external impact of the edge sealing and save space, a mechanical mold or equipment is used to fold the narrow strip-shaped edge sealing left after cutting the edge to the direction along the side surface of the battery cell body.

[0004] With the development of portable electronic devices towards thin and small size and the rise of new applications such as wearable devices, the demand for ultra-thin soft package lithium batteries is increasingly urgent. In order to realize the strict thickness limit of the soft package battery, the edge cutting width of the packaging edge is usually designed very narrow. Such extremely narrow edge cutting width requirement has posed unprecedented challenges to the accurate cutting positioning process in the manufacturing process.

[0005] The edge cutting process commonly used in the industry at present has the following core steps: ① positioning: placing the packaged soft package battery into a positioning groove (or positioning jig, clamp), relying on the physical boundary of the groove to constrain the position of the battery body. ② cutting: using a fixedly installed cutting knife to cut the edge of the battery according to the preset path.

[0006] The traditional process has a series of key defects that are difficult to overcome when applied to batteries with extremely thin thickness and narrow cutting edge width. In order to prevent such damage, the inner cavity size of the positioning groove is usually designed to be slightly larger than the outer contour size of the battery body. During the process of placing the battery, clamping the device, or subsequent cutting action, the battery body is prone to left-right deviation or tilting in the positioning groove. The cutting tool is fixed on the device, and its cutting path is usually fixed after being set. The positioning deviation directly leads to the deviation of the actual cutting line relative to the position of the battery body, resulting in obvious deviation and inconsistency of the cutting edge width at different parts of the battery or even between different battery individuals. The sealing is not tight, especially in the area where the effective sealing area is insufficient, so that the humidity in the environment easily enters the inside of the battery. This not only sharply reduces the moisture resistance of the battery, but also causes the battery to quickly degrade in performance. In severe cases, it may cause the battery to leak, release toxic, harmful or even explosive gases, and cause serious safety accidents and environmental pollution. The width of the reserved packaging edge material exceeds the maximum design value. In the subsequent edge folding process, these over-wide edges will exceed the surface of the battery body after folding, commonly known as "flash" or "over-border edge folding".

[0007] This problem can cause the battery to have poor moisture resistance, and in severe cases, it can cause the battery to leak and release toxic gases, posing a safety hazard.

[0008] As can be seen, the existing soft package battery cutting edge method has the problems of insufficient positioning accuracy leading to battery position deviation, fixed cutting tool and position deviation jointly causing poor cutting edge width consistency, and cutting edge width fluctuation causing insufficient effective sealing area, over-wide cutting edge, and over-standard edge folding. SUMMARY

[0009] To solve the problems existing in the prior art, the main purpose of the present application is to provide a method and system for optimizing the cutting edge position of a soft package battery based on machine vision recognition, which uses machine vision recognition to position the cutting edge position of the soft package battery edge, avoids the problems of insufficient or over-wide effective sealing area, thereby improving the sealing performance of the soft package battery, reducing the space occupied by the soft package battery, and improving the quality and market acceptance.

[0010] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: In a first aspect, the present application provides a method for optimizing the cutting edge position of a soft package battery based on machine vision recognition, wherein the soft package battery is provided with a positive edge on the side with a tab and a side edge on the side without a tab; the method is used for cutting edge positioning of the side edge of the soft package battery, and the method comprises the steps of: obtaining image data of the soft package battery to be cut; wherein the image data is obtained by shooting in the direction of the side edge to be cut; The image data is processed visually to obtain side seal edge thickness data in the image data and side seal gap thickness data in the image data, the inside positioning reference of the side seal edge is determined by comparing the side seal edge thickness data and the side seal gap thickness data, and the outside positioning reference of the side seal edge is determined according to the inside positioning reference and a preset seal edge expected width. The soft package battery or the cutter mechanism is driven to move, so that the cutter mechanism shears the outside positioning reference of the side seal edge.

[0011] Optionally, the method further includes: The profile of the side seal edge is determined according to the pixel difference between the side seal edge and the background, the first distance value between the upper and lower profile boundaries is detected from the outer edge of the side seal edge to the inside, the distance data between the first distance values is sequentially compared, and the distance data that does not exceed the set value is taken as the side seal edge thickness data, the second distance value between the upper and lower profile boundaries is detected from the outer edge of the side seal edge to the soft package battery side edge, the second distance value that is greater than the side seal edge thickness data is taken as the side seal gap thickness data, the distance difference between the side seal edge thickness data and the side seal gap thickness data is compared, and the position of the side seal gap thickness data with the minimum distance difference is taken as the inside positioning reference.

[0012] Optionally, the shearing positioning reference of the cutter mechanism is parallel to the side positioning reference of the soft package battery to be cut, and the shooting angle is parallel to the side positioning reference of the soft package battery to be cut.

[0013] Optionally, the cutter mechanism is configured to be in a fixed position, and the soft package battery is driven to move in the direction close to and away from the cutter mechanism, so that the cutter mechanism shears the outside positioning reference of the side seal edge.

[0014] Optionally, the soft package battery can be driven to rotate, so that after the side seal edge of the soft package battery is cut, the other side seal edge to be cut of the soft package battery is rotated to the position facing the cutter.

[0015] Optionally, before the image data of the soft package battery to be cut is obtained, the side seal edge to be cut of the soft package battery is flattened.

[0016] Optionally, the image data is CCD image data.

[0017] In a second aspect, the present application provides a system for identifying and optimizing the cutting position of a soft package battery based on machine vision, wherein the soft package battery is provided with a positive seal edge on the side with a tab and a side seal edge on the side without a tab; the system is used for cutting positioning of the side seal edge, and the system comprises: a cutter mechanism for cutting the side seal edge of the soft package battery; A shooting module is configured to acquire image data of the soft-pack battery to be trimmed. A visual processing module is configured to acquire side seal thickness data in the image data and side seal gap thickness data in the image data, to determine an inside positioning reference of the side seal by comparing the side seal thickness data and the side seal gap thickness data, and to determine an outside positioning reference of the side seal according to the inside positioning reference and a preset desired width of the side seal. A moving platform is configured to move the soft-pack battery or the cutting mechanism so that the cutting mechanism cuts the positioning reference to coincide with the outside positioning reference of the side seal.

[0018] Preferably, the system further comprises: A positioning jig is configured to fix the soft-pack battery and to form various side positioning references of the soft-pack battery. The positioning jig is arranged in parallel to the cutting positioning reference of the cutting mechanism with the side positioning reference of the soft-pack battery to be cut, and the shooting module is arranged in parallel to the side positioning reference of the soft-pack battery to be cut with the shooting angle.

[0019] Preferably, the shooting module is a CCD camera, the cutting mechanism is arranged at a fixed position, and the positioning jig is arranged on the cutting mechanism. The moving platform is configured to move the positioning jig towards or away from the cutting mechanism so that the cutting mechanism cuts the positioning reference to coincide with the outside positioning reference of the side seal. The moving platform is further configured to move the positioning jig in rotation so that, after cutting one side seal of the soft-pack battery, the other side seal to be cut of the soft-pack battery is rotated to a position facing the cutting mechanism.

[0020] Compared with the prior art, the present application has the following advantages: (1) The method and system of the present application can obtain side seal thickness data and side seal gap thickness data by processing the image data obtained by shooting towards the extending direction of the side seal to be cut, can determine the inside positioning reference of the side seal by comparing the side seal thickness data and the side seal gap thickness data, can further determine the outside positioning reference of the side seal, and can control the cutting mechanism to cut the side seal along the outside positioning reference so as to realize the desired width of the side seal. Overall, the present application can identify and position the cutting position of the side seal of the soft-pack battery by using machine vision, can avoid the problems of insufficient or excessively wide seal area, can improve the sealing performance of the soft-pack battery, can reduce the space occupied by the soft-pack battery, and can improve the quality and market acceptance.

[0021] (2) The method and system of the present application, the collected image data is shot in the direction extending towards the side seal to be cut, so that the side seal thickness and the side seal gap thickness can be detected, and the inside positioning reference of the side seal is further determined by the difference between the two thicknesses, solving the problem of difficult determination of the side seal and the side seal gap boundary on the silver-white aluminum plastic packaging image.

[0022] (3) The method and system of the present application still use the cutting knife mechanism, positioning jig and other edge cutting equipment, and only by setting the moving platform, shooting module and visual processing module can the edge cutting width be accurately positioned, so that the quality of the battery is improved by using simple upgrading.

[0023] The present application will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a typical soft package battery front view structural schematic diagram.

[0025] Figure 2 It is a flowchart of a method for identifying and optimizing the edge cutting position of a soft package battery based on machine vision according to an embodiment of the present application; Figure 3 It is a front view structural schematic diagram of a system for identifying and optimizing the edge cutting position of a soft package battery based on machine vision according to an embodiment of the present application; Figure 4 It is a side view structural schematic diagram of a system for identifying and optimizing the edge cutting position of a soft package battery based on machine vision according to an embodiment of the present application; Figure 5 It is a circuit function structural schematic diagram of a system for identifying and optimizing the edge cutting position of a soft package battery based on machine vision according to an embodiment of the present application; Figure 6 It is one of the image data schematic diagrams obtained by the method and system according to an embodiment of the present application; Figure 7 It is another image data schematic diagram obtained by the method and system according to an embodiment of the present application.

[0026] Reference signs: 10, soft package battery; 20, battery core; 30, packaging body; 31, positive seal; 32, side seal; 33, side seal gap; 40, tab; 51, cutting knife mechanism; 52, shooting module; 53, visual processing module; 54, moving platform; 55, positioning jig. DETAILED DESCRIPTION

[0027] For better purposes, technical solutions and advantages of the present application, the specific embodiments of the present application are further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0028] In the description of the application, it needs to be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, only for the purpose of facilitating the description of the application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0029] It should be noted that when a component / part is referred to as "disposed on" another component / part, it can be directly disposed on the other component / part or there can be a middle component / part. When a component / part is referred to as "connected / coupled" to another component / part, it can be directly connected / coupled to the other component / part or there can be a middle component / part. The term "connected / coupled" as used herein can include mechanical physical connection / coupling. The term "includes / contains" as used herein refers to the presence of a feature, step or component / part, but does not exclude the presence or addition of one or more other features, steps or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification herein is for the purpose of describing specific embodiments only and is not intended to be limiting of the application. In addition, in the description of the application, the terms "first", "second", etc. are used only for descriptive purposes and are not intended to indicate or imply relative importance. In addition, in the description of the application, the term "multiple" means two or more, unless otherwise specified.

[0031] Reference Figure 1 Refers to a typical soft pack battery 10. The soft pack battery 10 includes an electric core 20 and a packaging body 30. Among them, the electric core 20 is a cuboid shape, has front and back surfaces, top and bottom side surfaces, and left and right side surfaces. The top of the electric core 20 is provided with two positive and negative electrode tabs 40. Illustratively, the single aluminum plastic packaging body 30 wraps the electric core 20 in the packaging body 30 from the bottom to the top direction with the middle part folded, and exposes the two electrode tabs 40. Thus, the packaging body 30 forms a positive sealing edge 31 on the top side surface of the electric core 20, which needs to seal the electrode tab 40. The packaging body 30 forms a side sealing edge 32 on the left and right side surfaces of the electric core 20, which does not need to seal the electrode tab 40. The side sealing edge 32 is formed by the relative hot melt bonding of the film packaging body 30. However, near the side surface position of the electric core 20, the film packaging body 30 is in a curved state and cannot be close to each other and bonded in the hot melt process, thereby forming a side seam gap.

[0032] It can be understood that during the processing of the soft package battery 10, a certain allowance will be reserved for the edge before the secondary sealing, and the edge of the soft package battery 10 needs to be trimmed after the secondary sealing to make the edge width reach the design expectation. However, the side seam gap of different soft package batteries 10 is slightly different, and the positioning fixture 55 has positioning errors, and under the superposition of the above, the edge width reaches the design expectation. The CCD machine vision recognition has the functions of detection and recognition, but the package body 30 of the battery is usually silver-white, and the reflection and shadow are extremely small. Even if the CCD machine vision recognition technology is used, the image taken is in a high-brightness reflection state, which is not only difficult to achieve effective positioning of the trimming position, but also easy to cause more errors.

[0033] As shown in Figure 2 , it is a method for optimizing the trimming position of a soft package battery 10 based on machine vision recognition according to an embodiment of the present disclosure. The method is used for trimming the side edge 32 of the soft package battery 10, and the method comprises the steps of: S100, obtaining image data of a soft package battery 10 to be trimmed. The image data is obtained by shooting in the extension direction of the side edge 32 to be trimmed.

[0034] It is worth noting that the image data collected is shot in the extension direction of the side edge 32 to be trimmed, so that the image data can show the side edge thickness and the side seam gap thickness. In particular, the shooting background of the soft package battery 10 is configured to a certain contrast color, which can highlight the profile of the side edge 32 and the side seam gap 33.

[0035] Specifically, in step S100, before obtaining the image data of the soft package battery 10 to be trimmed, the side edge 32 to be trimmed of the soft package battery 10 is flattened. Non-uniform illumination will reduce the image quality. If there is a small wrinkle or material reflection on the edge of the soft package battery 10, the photographed side edge 32 will present a straight line shape, and the side edge thickness measurement error caused by the unevenness of the side edge 32 is also avoided.

[0036] Specifically, in step S100, the shearing positioning reference C of the cutter mechanism 51 is parallel to the side positioning reference A of the soft package battery 10 to be trimmed, and the shooting angle is parallel to the side positioning reference A of the soft package battery 10 to be trimmed. Therefore, the side positioning reference A and the shearing positioning reference C are perpendicular to the photographed image. The shearing positioning reference C is parallel to the extension direction of the side edge 32. It can be understood that the side of the soft package battery 10 is usually slightly uneven, but the soft package battery 10 is fixed on the positioning fixture 55, and the positioning fixture 55 can determine the side positioning reference A of the battery. Therefore, by determining the relative position between the positioning fixture 55 and the cutter mechanism 51, the shearing positioning reference C can be parallel to the side positioning reference A of the soft package battery 10.

[0037] Specifically, in step S100, the image data is the image data captured by the CCD. The CCD image data has the characteristics of high resolution and high precision. By configuring the image data to be obtained by the CCD capturing, the accuracy of the thickness detection can be improved, and the accuracy of the position positioning of the trimming edge can be improved.

[0038] S200, by processing the image data by vision, obtaining the side sealing edge thickness data in the image data, and obtaining the side sealing gap thickness data in the image data, determining the inside positioning reference B1 of the side sealing edge 32 by comparing the side sealing edge thickness data and the side sealing gap thickness data, and determining the outside positioning reference B2 of the side sealing edge 32 according to the inside positioning reference B1 and the preset sealing edge expected width W ref determine the outside positioning reference B2 of the side sealing edge 32.

[0039] Specifically, in step S200, the image data is the image data captured by the CCD. The CCD image data has the characteristics of high resolution and high precision. By configuring the image data to be obtained by the CCD capturing, the accuracy of the thickness detection can be improved, and the accuracy of the position positioning of the trimming edge can be improved. Figure 6 In the image data, the pixel difference between the side sealing edge 32 and the background determines the profile of the side sealing edge 32, and the pixel difference between the side sealing gap 33 and the background determines the profile of the side sealing gap 33. By locating the profile pixels and applying binary segmentation, the boundary between the side sealing edge 32 and the background can be extracted, and the boundary between the side sealing gap 33 and the background can be extracted. After profile detection, the image cannot actually distinguish between the side sealing edge 32 and the side sealing gap 33. By detecting inward along the outer edge of the side sealing edge 32 (scanning detection from right to left along the profile X axis), a first distance value between the upper and lower profile boundaries can be obtained. The first distance value is sequentially compared with the set value distance data, and the first distance value is determined as the side sealing edge thickness data. By detecting outward along the inside of the side sealing edge 32 (scanning detection from left to right along the profile X axis), a second distance value between the upper and lower profile boundaries can be obtained. These second distance values have a large difference, and the second distance values can be determined as the side sealing gap thickness data. The first distance value can be one of the average value or the median value, representing the side sealing edge thickness data. By sequentially comparing each side sealing gap thickness data with the side sealing gap thickness data, a distance difference value is obtained, and the minimum value of the distance difference value is determined to obtain the side sealing gap thickness data at the minimum value. Since the relative positions between the side sealing edge 32 of the soft package battery 10, the positioning jig 55, the shooting direction, and the cutting knife mechanism 51 have been positioned, the X axis coordinate of the side sealing gap thickness data can be taken as the inside positioning reference B1, and the inside positioning reference B1 is added to the preset sealing edge expected width W ref , the outside positioning reference B2 of the side sealing edge 32 can be obtained.

[0040] S300, driving the soft package battery 10 or the cutting knife mechanism 51 to move, so that the cutting knife mechanism 51 shears the positioning reference C to coincide with the outside positioning reference B2 of the side sealing edge 32.

[0041] Specifically, in step S300, the cutter mechanism is configured to be fixed in position, and the soft package battery 10 is driven to move in the direction close to and away from the cutter mechanism 51, so that the cutter mechanism 51 shears the positioning reference C coincides with the outer positioning reference B2 of the side seal edge 32. Thus, the cutter mechanism 51 can be controlled to make the side seal edge 32 of the soft package battery 10 to be cut to be cut according to the desired seal edge width Wref.

[0042] Specifically, in step S300, the soft package battery 10 can be driven to rotate to make the side seal edge 32 of the soft package battery 10 to be cut to be cut after the side seal edge 32 of the soft package battery 10 is cut.

[0043] Thus, the embodiment of the method of the present disclosure uses machine vision to identify the cutting position of the seal edge of the soft package battery 10, which can realize the seal edge width to meet the desired seal edge width Wref, avoid the problem of insufficient or excessive seal area, improve the sealing performance of the soft package battery 10, reduce the space occupied by the soft package battery 10, and improve the quality and market acceptance.

[0044] As shown in Figures 3 to 5 is a system for optimizing the cutting position of the soft package battery 10 based on machine vision according to an embodiment of the present disclosure. The system comprises a cutter mechanism 51, a shooting module 52, a vision processing module 53, a moving platform 54, a positioning jig 55 and an industrial computer.

[0045] In detail, the cutter mechanism 51 is used to cut the side seal edge 32 of the soft package battery 10. The positioning jig 55 is used to fix the soft package battery 10 and form the various side positioning references A of the soft package battery 10. The shooting module 52 is used to obtain image data of the soft package battery 10 to be cut, and the image data is obtained by shooting in the direction of the side seal edge 32 to be cut. The vision processing module 53 is electrically connected to the shooting module 52, and is used to obtain the side seal edge thickness data in the image data, and obtain the side seal gap thickness data in the image data, determine the inner positioning reference B1 of the side seal edge 32 by comparing the side seal edge thickness data and the side seal gap thickness data, and determine the outer positioning reference B2 of the side seal edge 32 according to the inner positioning reference B1 and the preset desired seal edge width Wref. ref determine the outer positioning reference B2 of the side seal edge 32. The vision processing module 53 is also electrically connected to the industrial computer, and the industrial computer is connected to the moving platform 54 and the cutter mechanism 51. The moving platform 54 is used to drive the soft package battery 10 or the cutter mechanism 51 to move, so that the cutter mechanism 51 shears the positioning reference C coincides with the outer positioning reference B2 of the side seal edge 32. After the positioning of the cutting position is completed, the industrial computer controls the cutter mechanism 51 to operate, so that the cutter mechanism 51 performs shearing action according to the shearing positioning reference C.

[0046] In the system of the embodiment, specifically, the positioning jig 55 is arranged in a manner that the side positioning reference A of the soft-pack battery 10 to be cut is parallel to the shearing positioning reference C of the cutter mechanism 51, and the shooting module 52 is arranged in a manner that the shooting angle is parallel to the side positioning reference A of the soft-pack battery 10 to be cut. In other embodiments, the positioning jig 55 can also be configured to not only have the function of fixing the battery body, but also have the function of fixing the side sealing edge 32 to be flat.

[0047] In the system of the embodiment, the moving platform 54 is used to drive the positioning jig 55 to move in the direction close to or away from the cutter mechanism 51, so that the shearing positioning reference C of the cutter mechanism 51 coincides with the outer positioning reference B2 of the side sealing edge 32. The moving platform 54 is also used to drive the positioning jig 55 to rotate, so that after the side sealing edge 32 of the soft-pack battery 10 is cut, the other side sealing edge 32 to be cut of the soft-pack battery 10 is rotated to the position facing the cutter.

[0048] Reference Figure 6 The image data shown in the schematic diagram is obtained by the shooting module 52. The image data shows the clear outlines of the side sealing edge 32 and the background, and the side sealing gap 33 and the background. Along the outer edge of the side sealing edge 32 to the inside, the first distance value between the upper and lower profile boundaries is detected, and the first distance value is sequentially determined as the side sealing edge thickness data, with the difference between the first distance values not exceeding the set distance data. Along the inside of the side sealing edge 32 to the outer edge, the second distance value between the upper and lower profile boundaries is detected, and the side sealing gap thickness data is determined. By comparing the side sealing gap thickness data and the side sealing edge thickness data, the boundary between the side sealing gap 33 and the side sealing edge 32 can be determined, and thus the inside positioning reference B1, the outside positioning reference B2 and the shearing positioning reference C can be determined.

[0049] It can be understood that as the side sealing gap 33 of the soft-pack battery 10 changes, the determined inside positioning reference B1 and outside positioning reference B2 will also change accordingly, and the amount of the cut side sealing edge 32 will also be different, but the distance between the inside positioning reference B1 and the outside positioning reference B2 is the set sealing edge expected width W ref , that is, the effective sealing width of the side sealing edge 32 of the soft-pack battery 10 meets the setting.

[0050] Reference Figure 7The image data is obtained by the shooting module 52, and the image data shows the clear outline of the side seal 32 and the background, and the side seal gap 33 and the background. The image data also shows that the position of the non-end part of the side seal 32 has a convex part. Therefore, by comparing the side seal gap thickness data and the side seal thickness data, it is determined that the inner side positioning reference B1 will move to the outside of the convex part to the right, and correspondingly, the outer side positioning reference B2 and the shearing positioning reference C also move to the right, the amount of the sheared seal edge is reduced, but the effective seal width meets the desired seal width W ref .

[0051] Therefore, the soft package battery 10 manufactured according to the present disclosure can have different lengths of the side seal 32 extending out of the side of the battery, but the effective seal width of the side seal 32 is consistent and meets the desired seal width W ref , thereby improving the sealing performance of the soft package battery 10, reducing the space occupied by the soft package battery 10, and improving the quality and market acceptance.

[0052] The above embodiments mainly describe the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A method for identifying an optimized edge trimming position of a soft-pack battery (10) based on machine vision, wherein, The soft package battery (10) is provided with a positive sealing edge (31) on the side with the tab (40) and a side sealing edge (32) on the side without the tab (40); the method is used for edge positioning of the side sealing edge (32) of the soft package battery (10), and is characterized in that the method comprises the steps of: obtaining image data of the soft package battery (10) to be cut; wherein the image data is obtained by shooting in the extension direction of the side sealing edge (32) to be cut; The image data is processed visually to obtain side seal edge thickness data in the image data and to obtain side seal gap thickness data in the image data. An inner side positioning reference (B1) of the side seal edge (32) is determined by comparing the side seal edge thickness data and the side seal gap thickness data. An outer side positioning reference (B2) of the side seal edge (32) is determined based on the inner side positioning reference (B1) and a preset seal edge desired width (W ref ). driving the soft package battery (10) or the cutting mechanism (51) to move, so that the cutting mechanism (51) coincides with the outer side positioning reference (B2) of the side sealing edge (32) through the shearing positioning reference (C).

2. The method for identifying and optimizing the edge cutting position of the soft package battery (10) based on machine vision according to claim 1, characterized in that, The visual processing image data comprises: determining the profile of the side sealing edge (32) through the pixel difference between the side sealing edge (32) and the background, detecting the first distance value between the upper and lower profile boundaries along the outer edge of the side sealing edge (32) to the inside, the first distance value is sequentially between the difference, and the distance data that does not exceed the set value is the side sealing edge thickness data, detecting the second distance value between the upper and lower profile boundaries along the side of the soft package battery (10) to the outer edge of the side sealing edge (32), and the second distance value is greater than the side sealing gap thickness data, comparing the distance difference between the side sealing edge thickness data and the side sealing gap (33) thickness, and taking the position of the side sealing gap thickness data with the smallest distance difference as the inside positioning reference (B1).

3. The method for identifying and optimizing the edge cutting position of the soft package battery (10) based on machine vision according to claim 1, characterized in that, The shearing positioning reference (C) of the cutting mechanism (51) is parallel to the side positioning reference (A) of the soft package battery (10) to be cut, and the shooting angle is parallel to the side positioning reference (A) of the soft package battery (10) to be cut.

4. The method for identifying and optimizing the edge cutting position of the soft package battery (10) based on machine vision according to claim 1, characterized in that, The cutting mechanism (51) is configured to be in a fixed position, and the soft package battery (10) is driven to move in the direction close to and away from the cutting mechanism (51), so that the cutting mechanism (51) coincides with the outer side positioning reference (B2) of the side sealing edge (32) through the shearing positioning reference (C).

5. The method for identifying and optimizing the edge cutting position of the soft package battery (10) based on machine vision according to claim 4, characterized in that, The soft package battery (10) can be driven to rotate, so that after the side sealing edge (32) of the soft package battery (10) is cut, the other side sealing edge (32) to be cut of the soft package battery (10) is rotated to the position facing the cutting mechanism.

6. The method for identifying and optimizing the edge cutting position of the soft package battery (10) based on machine vision according to claim 1, characterized in that, Before obtaining the image data of the soft package battery (10) to be cut, the side sealing edge (32) to be cut of the soft package battery (10) is flattened.

7. The method for identifying and optimizing the edge cutting position of the soft package battery (10) based on machine vision according to claim 1, characterized in that, The image data is CCD image data.

8. A system for identifying an optimized edge trimming position of a pouch battery (10) based on machine vision, wherein, The soft package battery (10) is provided with a positive sealing edge (31) on the side with the tab (40) and a side sealing edge (32) on the side without the tab (40); The system is used for edge positioning of the side sealing edge (32), and is characterized in that the system comprises: a cutting mechanism (51) for cutting the side sealing edge (32) of the soft package battery (10); a shooting module (52) for obtaining image data of the soft package battery (10) to be cut; wherein the shooting module (52) obtains the image data by shooting in the extension direction of the side sealing edge (32) to be cut; a vision processing module (53) to obtain side seal edge thickness data from the image data and to obtain side seal gap thickness data from the image data, to determine an inboard positioning datum (B1) for the side seal edge (32) by comparing the side seal edge thickness data and the side seal gap thickness data, and to determine an outboard positioning datum (B2) for the side seal edge (32) based on the inboard positioning datum (B1) and a predetermined seal edge desired width (W ref ). A moving platform (54) is configured to drive the soft package battery (10) or the cutting mechanism (51) to move, so that the cutting mechanism (51) shears the shearing positioning reference (C) to coincide with the outer positioning reference (B2) of the side sealing edge (32).

9. The system for identifying and optimizing the edge cutting position of a soft-pack battery (10) based on machine vision of claim 1, wherein, The system further comprises: A positioning jig (55) is configured to fix the soft package battery (10) and form each side positioning reference (A) of the soft package battery (10); The positioning jig (55) is arranged in parallel to the shearing positioning reference (C) of the cutting mechanism (51) with the side positioning reference (A) of the soft package battery (10) to be cut, and the shooting module (52) is arranged in parallel to the side positioning reference (A) of the soft package battery (10) to be cut with the shooting angle.

10. The system for identifying and optimizing the edge cutting position of a soft-pack battery (10) based on machine vision of claim 9, wherein, The shooting module (52) is a CCD camera, and the cutting mechanism (51) is configured to be fixed, and the positioning jig (55) is arranged thereon; The moving platform (54) is configured to drive the positioning jig (55) to move in the direction close to or away from the cutting mechanism (51), so that the cutting mechanism (51) shears the shearing positioning reference (C) to coincide with the outer positioning reference (B2) of the side sealing edge (32); The moving platform (54) is further configured to drive the positioning jig (55) to rotate, so that after the side sealing edge (32) of the soft package battery (10) is cut, the other side sealing edge (32) to be cut of the soft package battery (10) is rotated to the position facing the cutting mechanism.

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