Battery composite surface size detection method, device and system

Abstract

This application discloses a method, device and system for detecting the size of a composite surface of a battery. The method for detecting the size of a composite surface of a battery includes the steps of: acquiring image information of a positive electrode sheet including an image of a first surface of the positive electrode sheet and an image of a second surface opposite to the first surface; acquiring image information of a composite sheet including a non-composite surface formed by combining the first surface of the positive electrode sheet, a negative electrode and a separator, and a composite surface formed by combining the second surface of the positive electrode sheet, a negative electrode and a separator; and calculating size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet by an image processing algorithm, the image information of the composite sheet including the image information of the non-composite surface. This realizes size measurement of the composite surface of a stacked battery and improves the safety of the stacked battery.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION This application relates to the technical field of batteries, and specifically to methods, devices and systems for detecting the size of composite surfaces of batteries. [Background technology]

[0002] Currently, stacked batteries are typically fabricated using the power battery stacking process. In the resulting stacked battery, one side of the separator is combined with the negative electrode and the other side with the positive electrode. The composite surface of the negative electrode, separator, and positive electrode in a stacked battery is invisible, so its size cannot be detected. If the composite surface does not meet the required size, a short circuit may occur in the battery, causing serious safety issues. Summary of the Invention

[0003] The present application has been made in consideration of the above-mentioned problems, and provides a method, device, and system for detecting the size of a composite surface of a battery that can solve the safety problem of being unable to detect the size of the composite surface due to the invisible composite surface of a stacked battery.

[0004] In a first aspect, the present application provides a size detection method for a composite surface of a battery, the size detection method for a composite surface of a battery comprising the steps of: acquiring image information of a positive electrode sheet including an image of a first surface of the positive electrode sheet and an image of a second surface opposite to the first surface; acquiring image information of a composite sheet including a non-composite surface formed by combining the first surface of the positive electrode sheet, a negative electrode, and a separator; and a composite surface formed by combining the second surface of the positive electrode sheet, a negative electrode, and a separator; and calculating size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet using an image processing algorithm, wherein the image information of the composite sheet includes the image information of the non-composite surface.

[0005] In a technical solution according to an embodiment of the present application, an image of the first side of the positive electrode sheet and an image of the second side of the positive electrode sheet are first acquired, and an image of the non-composite side of the composite sheet is then acquired. Size information of the composite side is calculated based on the image of the first side of the positive electrode sheet, the image of the second side of the positive electrode sheet, and the image of the non-composite side using an image recognition algorithm. Because the non-composite side of the composite sheet is formed by combining the first side of the positive electrode sheet, the negative electrode sheet, and the separator, and the composite side is formed by combining the second side of the positive electrode sheet, the negative electrode sheet, and the separator, the size difference between the first and second sides of the positive electrode sheet can be recognized based on the image of the first side of the positive electrode sheet and the image information of the non-composite side. Therefore, the size information of the composite side can be obtained based on the size information of the non-composite side and the size difference between the first and second sides of the positive electrode sheet. This solves the safety problem of being unable to detect the size of the composite surface due to the invisible composite surface of the stacked battery, realizes the size measurement of the composite surface of the stacked battery, and improves the safety of the stacked battery.

[0006] In some embodiments, the size information for the composite surface includes the distance from the positive edge to the negative edge of the composite surface.

[0007] In some embodiments, the step of calculating size information of the composite surface based on image information of the positive electrode sheet and image information of the composite sheet using an image processing algorithm includes the steps of: calculating, using an image processing algorithm, a deviation amount representing the difference between the distance from the positive electrode edge to the ceramic edge on the first surface of the positive electrode sheet and the distance from the positive electrode edge to the ceramic edge on the second surface of the positive electrode sheet based on images of the first surface and the second surface of the positive electrode sheet; calculating the distance from the positive electrode edge to the negative electrode edge on the non-composite surface based on the image information of the composite sheet; and calculating the distance from the positive electrode edge to the negative electrode edge on the composite surface based on the distance from the positive electrode edge to the negative electrode edge on the non-composite surface and the deviation amount. In an embodiment of the present application, by calculating the deviation amount between the first surface and the second surface of the positive electrode sheet and calculating the distance from the positive electrode edge to the negative electrode edge on the composite surface based on the distance from the positive electrode edge to the negative electrode edge on the non-composite surface and the deviation amount, safety issues such as short circuits caused by the distance from the positive electrode edge to the negative electrode edge on the composite surface not satisfying a standard value are avoided, thereby improving the safety of the stacked battery.

[0008] In some embodiments, the step of calculating the amount of deviation based on the image of the first side and the image of the second side of the positive electrode sheet using an image processing algorithm includes the steps of recognizing and calculating, using an image processing algorithm, a first distance from the positive electrode edge to the ceramic edge on the first side of the positive electrode sheet based on the image of the first side of the positive electrode sheet, recognizing and calculating a second distance from the positive electrode edge to the ceramic edge on the second side of the positive electrode sheet based on the image of the second side of the positive electrode sheet, and calculating a difference between the first distance and the second distance to obtain the amount of deviation.

[0009] In some embodiments, the step of recognizing and calculating the first distance from the positive electrode edge to the ceramic edge on the first surface of the positive electrode sheet based on the image of the first surface of the positive electrode sheet by an image processing algorithm includes the steps of recognizing the positive electrode edge and the ceramic edge in the image of the first surface of the positive electrode sheet by an image recognition algorithm, and calculating the distance from the recognized positive electrode edge to the ceramic edge to obtain the first distance. An embodiment of the present application is a step of recognizing the first distance from the positive electrode edge to the ceramic edge on the first surface of the positive electrode sheet and the ceramic edge on the first surface of the positive electrode sheet based on the acquired first surface image and second surface image of the positive electrode sheet by an image recognition algorithm. 2nd side The amount of deviation is calculated based on the first distance and the second distance by recognizing and calculating the second distance from the positive electrode edge to the ceramic edge in each of the images. Thus, the amount of deviation is quickly recognized and calculated based on the image, and the size of the composite surface is detected more efficiently.

[0010] In some embodiments, the image information of the composite sheet includes a plurality of composite sheet images, each of which includes one corner of the composite sheet, and different composite sheet images include different corners of the composite sheet; the step of calculating the distance from the positive edge to the negative edge of the non-composite surface based on the image information of the composite sheet includes calculating the distance from the positive edge to the negative edge of the non-composite surface in the corresponding composite sheet image based on each of the composite sheet images; and the step of calculating the distance from the positive edge to the negative edge of the composite surface based on the distance from the positive edge to the negative edge of the non-composite surface and the deviation amount includes calculating the difference between the distance from the positive edge to the negative edge of the non-composite surface corresponding to each of the composite sheet images and the deviation amount, thereby obtaining the distance from the positive edge to the negative edge of the composite surface in each composite sheet image. In an embodiment of the present application, when a composite sheet is too large and the image captured by a single camera is unclear or not accurate enough, each corner of the composite sheet is photographed to obtain multiple composite sheet images, and the distance from the positive edge to the negative edge of the composite surface corresponding to each of the composite sheet images is calculated, thereby realizing size detection of the composite surface of a large-sized composite sheet.

[0011] In some embodiments, after calculating the size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet using an image processing algorithm, the method further includes determining whether the size information of the composite surface meets a predetermined standard, and generating a reconfirmation indication for the composite sheet if the size information of the composite surface does not meet the predetermined standard. In embodiments of the present application, after calculating the size information of the composite surface, determining whether the size information of the composite surface meets the predetermined standard and performing reconfirmation if the predetermined standard is not met avoids cost waste caused by performing subsequent cell manufacturing operations with a composite sheet that does not meet the standard and safety issues caused by manufacturing defective cells.

[0012] In some embodiments, the step of acquiring image information of the positive electrode sheet includes controlling the first camera and the second camera to photograph the first side and the second side of the positive electrode sheet, and obtaining an image of the first side of the positive electrode sheet and an image of the second side opposite the first side, and the installation positions of the first camera and the second camera include both sides of the positive electrode sheet conveying device.

[0013] In some embodiments, the step of acquiring image information of the composite sheet includes the steps of acquiring the number of the positive electrode sheet, determining the number of the camera module to be activated based on the number of the positive electrode sheet, and controlling the corresponding camera module to photograph the composite sheet according to the number of the camera module to be activated to obtain multiple composite sheet images, wherein there are multiple camera modules, and the multiple camera modules are installed on both sides of the composite sheet conveying device, and different camera module numbers correspond to different camera modules, and each camera module includes at least two third cameras.

[0014] In a second aspect, the present application provides a size detection device for a composite surface of a battery, the size detection device for a composite surface of a battery including an acquisition module and an image processing module, the acquisition module is for acquiring image information of the positive electrode sheet, including an image of a first surface of the positive electrode sheet and an image of a second surface opposite to the first surface, the acquisition module is further used to acquire image information of a composite sheet, including a non-composite surface formed by combining the first surface of the positive electrode sheet, the negative electrode, and the separator, and a composite surface formed by combining the second surface of the positive electrode sheet, the negative electrode, and the separator, the image processing module is used to calculate size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet using an image processing algorithm, the image information of the composite sheet including image information of the non-composite surface.

[0015] In a technical solution according to an embodiment of the present application, an image of the first side of the positive electrode sheet and an image of the second side of the positive electrode sheet are first acquired, and an image of the non-composite side of the composite sheet is then acquired. Size information of the composite side is calculated based on the image of the first side of the positive electrode sheet, the image of the second side of the positive electrode sheet, and the image of the non-composite side using an image recognition algorithm. Because the non-composite side of the composite sheet is formed by combining the first side of the positive electrode sheet, the negative electrode sheet, and the separator, and the composite side is formed by combining the second side of the positive electrode sheet, the negative electrode sheet, and the separator, the size difference between the first and second sides of the positive electrode sheet can be recognized based on the image of the first side of the positive electrode sheet and the image information of the non-composite side. Therefore, the size information of the composite side can be obtained based on the size information of the non-composite side and the size difference between the first and second sides of the positive electrode sheet. This solves the safety problem of being unable to detect the size of the composite surface due to the invisible composite surface of the stacked battery, realizes the size measurement of the composite surface of the stacked battery, and improves the safety of the stacked battery.

[0016] In some embodiments, the size information of the composite surface includes a distance from a positive edge to a negative edge of the composite surface. The image processing module is specifically for: using an image processing algorithm to calculate a deviation amount representing a difference between the distance from the positive edge to the ceramic edge of the first surface of the positive electrode sheet and the distance from the positive edge to the ceramic edge of the second surface of the positive electrode sheet based on the image of the first surface and the image of the second surface of the positive electrode sheet; calculating a distance from the positive edge to the negative edge of the non-composite surface based on the image information of the composite sheet; and calculating a distance from the positive edge to the negative edge of the composite surface based on the distance from the positive edge to the negative edge of the non-composite surface and the deviation amount.

[0017] In some embodiments, the image processing module specifically uses an image processing algorithm to recognize and calculate a first distance from the positive electrode edge on the first surface of the positive electrode sheet to the ceramic edge based on an image of the first surface of the positive electrode sheet, recognize and calculate a second distance from the positive electrode edge on the second surface of the positive electrode sheet to the ceramic edge based on an image of the second surface of the positive electrode sheet, and calculate the difference between the first distance and the second distance to obtain the amount of deviation.

[0018] In some embodiments, the image processing module is specifically configured to recognize a positive electrode edge and a ceramic edge in an image of the first surface of the positive electrode sheet using an image recognition algorithm, and to calculate a distance from the recognized positive electrode edge to the ceramic edge to obtain a first distance.

[0019] In some embodiments, the image information of the composite sheet includes a plurality of composite sheet images, each of which includes one corner of the composite sheet, and different composite sheet images include different corners of the composite sheet. The image processing module specifically calculates, based on each of the composite sheet images, the distance from the positive edge to the negative edge of the non-composite surface in the corresponding composite sheet image, and calculates the difference between the distance from the positive edge to the negative edge of the non-composite surface corresponding to each of the composite sheet images and the deviation amount, so as to obtain the distance from the positive edge to the negative edge of the composite surface in each composite sheet image.

[0020] In some embodiments, the apparatus further includes a determination module that determines whether the size information of the composite surface meets a predetermined criterion, and a generation module that generates a reconfirmation representation of the composite sheet if the determination module determines that the size information of the composite surface does not meet the predetermined criterion.

[0021] In some embodiments, the acquisition module specifically controls the first and second cameras to capture images of the first and second sides of the positive electrode sheet, thereby obtaining an image of the first side of the positive electrode sheet and an image of the second side opposite to the first side. The installation positions of the first and second cameras include both sides of the positive electrode sheet conveying device.

[0022] In some embodiments, the acquisition module is more specifically configured to acquire the number of the positive electrode sheet, identify the number of a camera module to be activated based on the number of the positive electrode sheet, and control the corresponding camera module to photograph the composite sheet according to the number of the camera module to be activated to obtain multiple composite sheet images. The camera modules are provided on both sides of the composite sheet conveying device, and different camera module numbers correspond to different camera module numbers, and each camera module includes at least two third cameras.

[0023] In a third aspect, the present application provides an electronic device, the electronic device including a processor and a memory storing a computer program that, when executed by the processor, causes the processor to perform the first aspect or any one of the implementations of the first aspect.

[0024] In a fourth aspect, the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the method of the first aspect or any one of the implementations of the first aspect to be performed.

[0025] In a fifth aspect, the present application provides a computer program product which, when executed on a computer, causes the computer to perform the first aspect or any one of the implementations of the first aspect.

[0026] In a sixth aspect, the present application provides a size detection system for a composite surface of a battery, the size detection system for a composite surface of a battery including a camera module, a conveying device, and a data processing device, the data processing device is electrically connected to the camera module, the conveying device is for conveying a positive electrode sheet and a composite sheet, the composite sheet including a non-composite surface formed by combining a first surface of the positive electrode sheet, a negative electrode, and a separator, and a composite surface formed by combining a second surface of the positive electrode sheet, a negative electrode, and a separator, the data processing device is for controlling the camera module to photograph the positive electrode sheet in the conveying device and acquiring image information of the positive electrode sheet including an image of the first surface of the positive electrode sheet and an image of a second surface opposite to the first surface, the data processing device is further for controlling the camera module to photograph the composite sheet in the conveying device and acquiring image information of the composite sheet including image information of the non-composite surface, and the data processing device is further for calculating size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet using an image processing algorithm.

[0027] In a technical solution according to an embodiment of the present application, the camera module designed in the technical solution captures images of the first and second sides of the positive electrode sheet and the non-composite side of the composite sheet, and then uses an image recognition algorithm with a data processing device to calculate size information of the composite side based on the image of the first side of the positive electrode sheet, the image of the second side of the positive electrode sheet, and the image of the non-composite side. Because the non-composite side of the composite sheet is formed by combining the first side of the positive electrode sheet, the negative electrode sheet, and the separator, and the composite side is formed by combining the second side of the positive electrode sheet, the image of the first side of the positive electrode sheet and the image of the second side of the positive electrode sheet can be used to recognize the size difference between the first and second sides of the positive electrode sheet, and the size of the non-composite side can be recognized based on the image information of the non-composite side. Therefore, size information of the composite side can be obtained based on the size information of the non-composite side and the size difference between the first and second sides of the positive electrode sheet. This solves the safety problem of being unable to detect the size of the composite surface due to the invisible composite surface of the stacked battery, realizes the size measurement of the composite surface of the stacked battery, and improves the safety of the stacked battery.

[0028] The above is only a brief description of the technical solution of the present application, which can be implemented according to the content of the specification in order to make the technical solution of the present application more clearly understood. In addition, in order to make the above and other objectives, features and advantages of the present application more clear, specific embodiments of the present application are given below. [Brief explanation of the drawings]

[0029] Various other advantages will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not intended to limit the present application. Like reference numerals refer to like parts in all drawings. [Figure 1] 1 is a first schematic diagram of a size detection system for a composite surface of a battery according to the present application; FIG. [Figure 2] FIG. 2 is a second schematic diagram of a size detection system for a composite surface of a battery according to the present application. [Figure 3]1 is a first flowchart of a method for detecting the size of a composite surface of a battery according to the present application. [Figure 4] 4 is a second flowchart of a method for detecting the size of a composite surface of a battery according to the present application. [Figure 5] 1 is a schematic diagram showing the first and second surfaces of a positive electrode sheet according to the present application. [Figure 6] FIG. 2 is a schematic diagram of the non-composite surface of a composite sheet according to the present application. [Figure 7] 10 is a third flowchart of a method for detecting the size of a composite surface of a battery according to the present application. [Figure 8] 4 is a fourth flowchart of the method for detecting the size of a composite surface of a battery according to the present application. [Figure 9] 5 is a fifth flowchart of the method for detecting the size of a composite surface of a battery according to the present application. [Figure 10] 1 is a schematic diagram of a size detection device for a composite surface of a battery according to the present application; [Figure 11] 1 is a schematic configuration diagram of an electronic device according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, the embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following description of the embodiments is for illustrative purposes only, and is intended to more clearly explain the technical solution of the present application, and is not intended to limit the protection scope of the present application.

[0031] 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 pertains. The terms used herein are for the purpose of describing specific examples only and are not intended to limit the scope of this application. The terms "comprises," "has," and similar terms used in the specification, claims, and description of the drawings of this application are intended to cover a non-exclusive inclusion.

[0032] The terms "first," "second," etc. used in the examples of the present application are merely intended to distinguish between similar objects, and do not express or imply relative importance, the number of technical features, or limit a particular order or ranking. In the description of the examples of the present application, unless otherwise specifically limited, "plurality" means two or more.

[0033] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various parts of the specification do not all refer to the same embodiment, nor are they separate or alternative embodiments exclusive of one another. It is explicitly or implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "and / or" is merely used to describe the relationship between related objects and indicates that three relationships can exist. For example, A and / or B can indicate three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0035] In describing the examples of the present application, the term "plurality" means two or more (including two); similarly, "groups" means two or more (including two groups); and "plurality" means two or more (including two).

[0036] In describing the embodiments of the present application, directions or positional relationships expressed by terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," "circumferential direction," etc. are based on the drawings and are intended merely to conveniently and simply describe the embodiments of the present application, and do not explicitly or implicitly indicate that the devices or elements in question necessarily have a specific orientation, or are configured or operated in a specific direction, and therefore should not be understood as limiting the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, terms such as "attached," "linked," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection. They may also refer to a mechanical connection or an electrical connection. They may also refer to a direct connection, an indirect connection via an intermediate, or two elements may communicate with each other or interact with each other. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to the specific circumstances.

[0038] Currently, power batteries are often formed through two processes: winding and stacking. Batteries formed through the stacking process are called stacked batteries. Stacked batteries are typically constructed by combining a separator on the outer layer of a negative electrode sheet, and then combining a positive electrode sheet on the outer layer of the separator to form a composite sheet.

[0039] The present inventors have noticed that, while currently, size detection for stacked batteries is typically performed on the non-composite surface, which is the visible surface where the negative electrode sheet, separator, and positive electrode sheet are combined, there is a lack of relevant detection technology for the composite surface, which is the invisible surface where the negative electrode sheet, separator, and positive electrode sheet are combined. Furthermore, the size of the composite surface is just as important as that of the non-composite surface, and if the required size is not met, a short circuit may occur in the battery, resulting in a safety issue. For example, during the combining process in the stacking process, if the distance between the edge of the positive electrode sheet and the edge of the negative electrode sheet is too close and does not meet the predetermined standard distance, the positive and negative electrode sheets may become too close, resulting in a short circuit in the battery.

[0040] The inventors also discovered through research that: before combining the positive electrode sheet and the separator, the first and second sides of the positive electrode sheet are photographed to obtain image information of both sides of the positive electrode sheet, and the size difference between the two sides of the positive electrode sheet can be recognized based on the image information of both sides of the positive electrode sheet; after combining the positive electrode sheet and the separator, image information of the composite sheet is obtained, and size information of the non-composite side, which is the visible side of the composite sheet, can be recognized based on the image information of the composite sheet; and size information of the composite side of the composite sheet can be calculated based on the size difference between the two sides of the positive electrode sheet and the size information of the non-composite side. This allows for size detection of the composite side of the composite sheet of a stacked battery.

[0041] After extensive research, the inventors have designed a method for detecting the size of a composite surface of a battery. This method detects the size of the composite surface of a composite sheet by capturing images of both sides of the positive electrode sheet and the non-composite surface of the composite sheet, thereby solving the safety problem of being unable to detect the size due to the invisible composite surface of the electrode sheet of a stacked battery and improving the safety of the stacked battery.

[0042] The method for detecting the size of a composite surface of a battery disclosed in the embodiments of the present application can be applied to a data processing device. The data processing device includes, but is not limited to, computing devices such as processors, computers, and servers. The data processing device can be incorporated into a system for detecting the size of a composite surface of a battery, and can detect the size of the composite surface of a composite sheet online during the production of a composite sheet of a stacked battery.

[0043] As a possible embodiment, as shown in FIG. 1, the size detection system for the composite surface of a battery may include a camera module 10, a conveying device 20, and a data processing device 30 electrically connected to the camera module 10.

[0044] The conveying device 20 conveys the positive electrode sheet Y1 and the composite sheet F1. The composite sheet F1 includes a non-composite surface formed by combining the first surface of the positive electrode sheet Y1, the negative electrode Y2, and the separator G1, and a composite surface formed by combining the second surface of the positive electrode sheet Y1, the negative electrode Y2, and the separator G1. The data processing device 30 controls the camera module 10 to capture images of the positive electrode sheet Y1 and the composite sheet F1, acquiring images of the first and second surfaces of the positive electrode sheet Y1 and the non-composite surface of the composite sheet F1, and further using an image processing algorithm to calculate size information of the composite surface based on the images of the first and second surfaces of the positive electrode sheet and the image of the non-composite surface of the composite sheet.

[0045] 2, the conveying device 20 includes a positive electrode sheet conveying device 210 and a composite sheet conveying device 220. The positive electrode sheet conveying device 210 moves the positive electrode sheet Y1 so that it is combined with the negative electrode and the separator. The formed composite sheet F1 is conveyed to the next processing station by the composite sheet conveying device 220.

[0046] In addition to the above-mentioned conveying device, the camera module 10 of the technical solution includes a first camera group 110 and a second camera group 120. Specifically, the first camera group 110 is a camera A1 and a camera A2, respectively disposed on both sides of the positive electrode sheet conveying device 210. The positive electrode sheet conveying device 210 may have a transparent structure so that the cameras A1 and A2, respectively disposed on both sides, can capture different sides of the positive electrode sheet Y1 to obtain images of the first and second sides of the positive electrode sheet Y1. Furthermore, the positive electrode sheet conveying device 210 conveys multiple positive electrode sheets Y1, and the composite sheet conveying device 220 conveys multiple composite sheets F1, with the positive electrode sheets Y1 being composited on both sides of the composite sheet F1. Accordingly, the second camera group 120 includes two camera modules B1 and B2. Each of the camera modules B1 and B2 includes at least two cameras and is installed on both sides of the composite sheet conveying device 220. Therefore, in this technical solution, a positive electrode sheet number is assigned to each positive electrode sheet to correspond to the composite sheet. When the composite sheet formed by combining the positive electrode sheets is transported to the position of camera modules B1 and B2, the positive electrode sheet number is recognized and the camera module B1 or B2 is activated to take an image, thereby obtaining at least one composite sheet image corresponding to the positive electrode sheet.

[0047] The present application provides a method for detecting the size of a composite surface of a battery, which can be applied to the above-mentioned data processing device 30 to realize the size detection of the composite surface. As shown in Figure 3, the method includes the following steps:

[0048] Step S300: Image information of the positive electrode sheet is acquired.

[0049] Step S310: Image information of the composite sheet is obtained.

[0050] Step S320: Using an image processing algorithm, size information of the composite surface is calculated based on the image information of the positive electrode sheet and the image information of the composite sheet.

[0051] In the above embodiment, the image information of the positive electrode sheet includes an image of the first side of the positive electrode sheet and an image of the second side opposite the first side. The non-composite side of the composite sheet is formed by combining the first side of the positive electrode sheet, the negative electrode sheet, and the separator, and the composite side of the composite sheet is formed by combining the second side of the positive electrode sheet, the negative electrode sheet, and the separator. Since the non-composite side of the composite sheet is visible, the image information of the composite sheet acquired in step S310 is image information of the non-composite side. In addition, the image information of the positive electrode sheet can be acquired by controlling the cameras on both sides of the positive electrode sheet conveying device to take images. The image information of the composite sheet can be acquired by controlling the camera modules on both sides of the composite sheet conveying device to take images as described above.

[0052] The data processing device also uses an image processing algorithm to calculate size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet, including, but not limited to, the distance from the edge of the positive electrode sheet to the edge of the negative electrode sheet on the composite surface, and the distance from the edge of the positive electrode sheet to the edge of the composite sheet on the composite surface.

[0053] Specifically, the data processing device uses an image recognition algorithm to recognize the size difference between the first and second sides of the positive electrode sheet based on an image of the first side and an image of the second side of the positive electrode sheet, and also recognizes the size of the non-composite side based on image information of the non-composite side. Because the non-composite side is formed by combining the first side of the positive electrode sheet, the negative electrode sheet, and the separator, and the composite side is formed by combining the second side of the positive electrode sheet, the negative electrode sheet, and the separator, the size difference between the first and second sides of the positive electrode sheet can represent the size difference between the composite side and the non-composite side of the composite sheet. Therefore, size information of the composite side can be obtained based on the size information of the non-composite side and the size difference between the first and second sides of the positive electrode sheet.

[0054] According to the above-described method for detecting the size of a composite surface of a battery, first, an image of the first side of the positive electrode sheet and an image of the second side of the positive electrode sheet are acquired, and then an image of the non-composite side of the composite sheet is acquired. Then, using an image recognition algorithm, size information of the composite surface is calculated based on the image of the first side of the positive electrode sheet, the image of the second side of the positive electrode sheet, and the image of the non-composite side. Because the non-composite side of the composite sheet is composed of the first side of the positive electrode sheet, the negative electrode sheet, and the separator, and the composite side is composed of the second side of the positive electrode sheet, the image of the first side of the positive electrode sheet and the image of the second side of the positive electrode sheet can be used to recognize the difference in size between the first and second sides of the positive electrode sheet, and the size of the non-composite side can be recognized based on the image information of the non-composite side. Therefore, size information of the composite surface can be obtained based on the size information of the non-composite side and the size difference between the first and second sides of the positive electrode sheet. This solves the safety problem of being unable to detect the size of the composite surface due to the invisible composite surface of the stacked battery, realizes the size measurement of the composite surface of the stacked battery, and improves the safety of the stacked battery.

[0055] According to some embodiments of the present application, the size information of the composite surface includes the distance from the positive electrode sheet edge to the negative electrode sheet edge on the composite surface. The distance from the positive electrode sheet edge to the negative electrode sheet edge on the composite surface represents the spacing between the positive and negative electrodes of the battery. If the spacing is too small, a short circuit may occur, so it is necessary to detect the distance from the positive electrode sheet edge to the negative electrode sheet edge on the composite surface. Therefore, as shown in FIG. 4, the above step 320 may include the following steps:

[0056] Step S400: An image processing algorithm is used to calculate the amount of deviation based on the images of the first and second surfaces of the positive electrode sheet.

[0057] Step S410: Based on the image information of the composite sheet, the distance from the positive edge to the negative edge on the non-composite surface is calculated.

[0058] Step S420: Based on the distance from the positive edge to the negative edge on the non-composite surface and the amount of deviation, the distance from the positive edge to the negative edge on the composite surface is calculated.

[0059] In step S400, the amount of deviation represents the difference between the distance from the positive electrode edge to the ceramic edge on the first surface of the positive electrode sheet and the distance from the positive electrode edge to the ceramic edge on the second surface of the positive electrode sheet. Specifically, as shown in FIG. 5, FIG. 5a is a schematic diagram of the first surface of the positive electrode sheet Y1. The first surface of the positive electrode sheet Y1 includes a polar region Y1A1 on the first surface of the positive electrode sheet, a ceramic region Y1A2 on the first surface of the positive electrode sheet, and a tab Y1A3 on the first surface of the positive electrode sheet. FIG. 5b is a schematic diagram of the second surface of the positive electrode sheet Y1. The second surface of the positive electrode sheet Y1 includes a polar region Y1B1 on the second surface of the positive electrode sheet, a ceramic region Y1B2 on the second surface of the positive electrode sheet, and a tab Y1B3 on the second surface of the positive electrode sheet. The amount of deviation represents the difference between the distance A from the edge of the polar region Y1A1 on the first surface of the positive electrode sheet to the edge of the ceramic region Y1A2 on the first surface of the positive electrode sheet and the distance B from the edge of the polar region Y1B1 on the second surface of the positive electrode sheet to the edge of the ceramic region Y1B2 on the second surface of the positive electrode sheet. In other words, the amount of deviation = AB.

[0060] In step S410, the image information of the composite sheet is the image information of the non-composite side of the composite sheet. This technical solution can recognize the distance from the positive electrode edge to the negative electrode edge in the image information of the non-composite side using an image recognition algorithm. Specifically, on the non-composite side of the composite sheet shown in FIG. 6, the separator is the widest, the negative electrode is the second widest, and the positive electrode is the narrowest, with the separator covering the negative electrode and the negative electrode covering the positive electrode. The non-composite side is formed by the first side of the positive electrode sheet, the negative electrode sheet, and the separator. The image information of the non-composite side can be used to recognize the distance D from the positive electrode edge to the negative electrode edge on the non-composite side.

[0061] This technical solution can calculate the distance from the positive electrode edge to the negative electrode edge in the composite surface based on the distance from the positive electrode edge to the negative electrode edge in the non-composite surface and the offset. Specifically, the offset represents the difference between the distance A from the polar region edge to the ceramic region edge on the first surface of the positive electrode sheet and the distance B from the polar region edge to the ceramic region edge on the second surface of the positive electrode sheet. The distance D from the positive electrode edge to the negative electrode edge in the non-composite surface represents the distance from the polar region edge on the first surface of the positive electrode sheet to the negative electrode sheet edge. Therefore, by subtracting the offset from the distance D from the positive electrode edge to the negative electrode edge in the non-composite surface, the distance from the polar region edge on the second surface of the positive electrode sheet to the negative electrode sheet edge, i.e., the distance from the positive electrode edge to the negative electrode edge in the composite surface, can be obtained.

[0062] In the examples of the present application, the amount of deviation between the first and second surfaces of the positive electrode sheet is calculated, and the distance from the positive electrode edge to the negative electrode edge in the composite surface is calculated based on the distance from the positive electrode edge to the negative electrode edge in the non-composite surface and the amount of deviation. This avoids safety issues such as short circuits caused by the distance from the positive electrode edge to the negative electrode edge in the composite surface not satisfying a standard value, thereby improving the safety of the stacked battery.

[0063] According to some embodiments of the present application, as shown in FIG. 7, the above-mentioned deviation amount can be calculated by the present technical solution as follows:

[0064] Step S700: Using an image processing algorithm, a first distance from the positive electrode edge to the ceramic edge on the first surface of the positive electrode sheet is recognized and calculated based on the image of the first surface of the positive electrode sheet.

[0065] Step S710: Based on the image of the second surface of the positive electrode sheet, a second distance from the positive electrode edge to the ceramic edge on the second surface of the positive electrode sheet is recognized and calculated.

[0066] Step S720: The difference between the first distance and the second distance is calculated to obtain the amount of deviation.

[0067] In step S700, the solution recognizes and calculates a first distance from the positive electrode edge on the first surface of the positive electrode sheet to the ceramic edge, i.e., the distance A, based on an image of the first surface of the positive electrode sheet. In one possible embodiment, the solution first recognizes the positive electrode edge and ceramic edge in the image of the first surface of the positive electrode sheet using an image recognition algorithm, and then calculates the distance from the positive electrode edge to the ceramic edge to obtain the first distance. Specifically, the positive electrode edge and ceramic edge have different colors. The positive electrode edge is typically white to gray, while the ceramic edge is typically white and has a straight line. Therefore, the positive electrode edge and ceramic edge can be recognized by line fitting and color coding. The positive electrode edge and ceramic edge are typically parallel lines, as shown in FIG. 5. Therefore, calculating the distance between them yields the distance from the positive electrode edge to the ceramic edge, thereby obtaining the first distance.

[0068] In step S710, the distance from the positive electrode edge to the ceramic edge in the image of the second surface of the positive electrode sheet can be calculated using the same method as in step S700, thereby obtaining the second distance, that is, the distance B described above.

[0069] Furthermore, the difference between the first distance A and the second distance B is calculated to obtain the amount of deviation. That is, the amount of deviation = AB.

[0070] In an embodiment of the present application, an image recognition algorithm is used to recognize and calculate a first distance from the positive electrode edge on the first surface of the positive electrode sheet to the ceramic edge and a second distance from the positive electrode edge on the second surface of the positive electrode sheet to the ceramic edge based on the acquired first and second surface images of the positive electrode sheet, and the amount of deviation is calculated based on the first and second distances. Thus, the amount of deviation is quickly recognized and calculated based on the images, improving the efficiency of detecting the size of the composite surface.

[0071] According to some embodiments of the present application, with respect to step S410 of calculating the distance from the positive edge to the negative edge of the non-composite surface based on the image information of the composite sheet, as a possible embodiment, in this technical solution, the positive edge and the negative edge of the non-composite surface are recognized by linear fitting and color coding in step S700, and the distance from the positive edge to the negative edge is calculated.

[0072] In another possible embodiment, composite sheets are generally large, and image information of the non-composite surface obtained by photographing the composite sheet with a single camera may be unclear or insufficient in accuracy. Therefore, the present technical solution photographs the composite sheet with multiple cameras to obtain multiple composite sheet images. Furthermore, the multiple cameras are installed on one side of the composite sheet conveying device, and each composite sheet image includes one corner of the composite sheet, with different composite sheet images including different corners of the composite sheet. Specifically, in this technical solution, four cameras photograph the four corners of the composite sheet, respectively, to obtain image information for each of the four corners of the composite sheet. Therefore, step S410 may include the following steps, as shown in FIG. 8:

[0073] Step S800: Based on each composite sheet image, calculate the distance from the positive edge to the negative edge of the non-composite surface in the corresponding composite sheet image.

[0074] Step S420 is realized as follows.

[0075] Step S810: Calculate the difference between the distance from the positive edge to the negative edge on the non-composite surface corresponding to each composite sheet image and the deviation amount, and obtain the distance from the positive edge to the negative edge on the composite surface of each composite sheet image.

[0076] In the above embodiment, for each composite sheet image, the distance from the positive edge to the negative edge of the non-composite side in the corresponding image is calculated, and the distance from the positive edge to the negative edge of the corresponding composite side is calculated using the deviation amount for the distance from the positive edge to the negative edge of the non-composite side corresponding to each composite sheet image.Only when the distance from the positive edge to the negative edge of the composite side corresponding to each composite sheet image meets the criterion, the size requirement of the composite side is met.

[0077] In an embodiment of the present application, when a composite sheet is too large and the image captured by a single camera is unclear or not accurate enough, each corner of the composite sheet is photographed to obtain multiple composite sheet images, and the distance from the positive edge to the negative edge of the composite surface corresponding to each of the composite sheet images is calculated, thereby realizing size detection of the composite surface of a large-sized composite sheet.

[0078] According to some embodiments of the present application, after calculating the size information of the composite surface in step S320, as shown in FIG. 9, the present technical solution may include the following steps:

[0079] Step S900: Determine whether the size information of the composite surface satisfies a predetermined standard. If NO, proceed to step S910, and if YES, proceed to step S920.

[0080] Step S910: Generate a review presentation of the composite sheet.

[0081] Step S920: Perform the subsequent operations on the composite sheet.

[0082] In this embodiment, a size standard for the composite surface is preset, and the size information of the composite surface is determined to meet the predetermined standard. For example, it is determined whether the distance from the positive electrode edge to the negative electrode edge of the composite surface is within a predetermined distance range. If it is not within the predetermined distance range, it means that the size information of the composite surface does not meet the predetermined standard. In this case, a composite sheet reconfirmation prompt is generated, prompting the operator to reconfirm the composite sheet or to control the waste discharge mechanism to perform waste discharge work on the composite sheet whose size information does not meet the predetermined standard. If it is within the predetermined distance range, it means that the size information of the composite surface meets the predetermined standard, and the subsequent cell manufacturing work is performed on this composite sheet.

[0083] In the embodiment of the present application, after calculating the size information of the composite surface, it is determined whether the size information of the composite surface meets a predetermined standard, and if it does not meet the predetermined standard, it is rechecked, thereby avoiding cost waste caused by performing subsequent cell manufacturing work with a composite sheet that does not meet the standard and safety issues caused by the production of defective cells.

[0084] Furthermore, while the above description has been given using an example in which the size information of the composite surface is the distance from the positive edge to the negative edge of the composite surface, the proposal of the present application may also use other information about the composite surface, and the processing method is similar to that described above. For example, assuming the size information of the composite surface is the distance from the positive edge of the composite surface to the edge of the composite sheet, the amount of deviation is first recognized and calculated based on image information of the first and second sides of the positive sheet (the method of calculating the amount of deviation is the same as above). Furthermore, the distance from the positive edge of the non-composite surface to the edge of the composite sheet is recognized using image information of the non-composite surface, and the amount of deviation is subtracted from the recognized distance from the positive edge of the non-composite surface to the edge of the composite sheet to obtain the distance from the positive edge of the composite surface to the edge of the composite sheet. Furthermore, in this proposal, other necessary size information about the composite surface can be detected in addition to the above description, thereby achieving comprehensive detection of size information about the composite surface.

[0085] FIG. 10 shows a schematic block diagram of a size detection device for a composite surface of a battery according to the present application. This device corresponds to the embodiment of the method performed in FIGS. 3 to 9 and is capable of executing the steps related to the above method. The specific functions of this device can be referred to above, and a detailed description will be omitted here for brevity. This device includes at least one software function module that can be stored as software in a memory or incorporated as firmware into the device's operating system (OS). Specifically, this device includes an acquisition module 1000 and an image processing module 1100. The acquisition module 1000 acquires image information of the positive electrode sheet, including an image of the first surface of the positive electrode sheet and an image of the second surface opposite the first surface. It also acquires image information of the composite sheet, including a non-composite surface formed by combining the first surface of the positive electrode sheet, the negative electrode, and the separator, and a composite surface formed by combining the second surface of the positive electrode sheet, the negative electrode, and the separator. The image information of the composite sheet includes image information of the non-composite surface. The image processing module 1100 uses an image processing algorithm to calculate size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet.

[0086] In a technical solution according to an embodiment of the present application, an image of the first side of the positive electrode sheet and an image of the second side of the positive electrode sheet are first acquired, and an image of the non-composite side of the composite sheet is then acquired. Size information of the composite side is calculated based on the image of the first side of the positive electrode sheet, the image of the second side of the positive electrode sheet, and the image of the non-composite side using an image recognition algorithm. Because the non-composite side of the composite sheet is formed by combining the first side of the positive electrode sheet, the negative electrode sheet, and the separator, and the composite side is formed by combining the second side of the positive electrode sheet, the negative electrode sheet, and the separator, the size difference between the first and second sides of the positive electrode sheet can be recognized based on the image of the first side of the positive electrode sheet and the image information of the non-composite side. Therefore, the size information of the composite side can be obtained based on the size information of the non-composite side and the size difference between the first and second sides of the positive electrode sheet. This solves the safety problem of being unable to detect the size of the composite surface due to the invisible composite surface of the stacked battery, realizes the size measurement of the composite surface of the stacked battery, and improves the safety of the stacked battery.

[0087] According to some embodiments of the present application, the size information of the composite surface optionally includes a distance from the positive edge to the negative edge of the composite surface. Specifically, the image processing module 1100 uses an image processing algorithm to calculate a deviation representing the difference between the distance from the positive edge to the ceramic edge of the first surface of the positive electrode sheet and the distance from the positive edge to the ceramic edge of the second surface of the positive electrode sheet based on the image of the first surface and the image of the second surface of the positive electrode sheet, calculates the distance from the positive edge to the negative edge of the non-composite surface based on the image information of the composite sheet, and calculates the distance from the positive edge to the negative edge of the composite surface based on the distance from the positive edge to the negative edge of the non-composite surface and the deviation.

[0088] According to some embodiments of the present application, optionally, the image processing module 1100, more specifically, uses an image processing algorithm to recognize and calculate a first distance from the positive electrode edge on the first surface of the positive electrode sheet to the ceramic edge based on the image of the first surface of the positive electrode sheet, recognize and calculate a second distance from the positive electrode edge on the second surface of the positive electrode sheet to the ceramic edge based on the image of the second surface of the positive electrode sheet, and calculate the difference between the first distance and the second distance to obtain the deviation amount.

[0089] According to some embodiments of the present application, optionally, the image processing module 1100 more specifically recognizes the positive electrode edge and the ceramic edge in the image of the first surface of the positive electrode sheet using an image recognition algorithm, calculates the distance from the recognized positive electrode edge to the ceramic edge, and obtains a first distance.

[0090] According to some embodiments of the present application, optionally, the image information of the composite sheet includes multiple composite sheet images, each of which includes one corner of the composite sheet, and different composite sheet images include different corners of the composite sheet. More specifically, the image processing module 1100 calculates, based on each of the composite sheet images, a distance from the positive edge to the negative edge of the non-composite surface in the corresponding composite sheet image, and calculates a difference between the distance from the positive edge to the negative edge of the non-composite surface corresponding to each of the composite sheet images and the deviation amount, thereby obtaining the distance from the positive edge to the negative edge of the composite surface in each composite sheet image.

[0091] According to some embodiments of the present application, the apparatus further includes a determination module 1200 and a generation module 1300. The determination module 1200 determines whether the size information of the composite surface meets a predetermined criterion. The generation module 1300 generates a reconfirmation presentation of the composite sheet when the determination module determines that the size information of the composite surface does not meet the predetermined criterion.

[0092] According to some embodiments of the present application, the acquisition module 1000 specifically controls the first and second cameras to capture images of the first and second sides of the positive electrode sheet, thereby obtaining an image of the first side of the positive electrode sheet and an image of the second side opposite to the first side. The first and second cameras may be installed on both sides of the positive electrode sheet conveying device.

[0093] According to some embodiments of the present application, the acquisition module 1000 more specifically acquires the number of the positive electrode sheet, identifies the number of the camera module to be activated based on the number of the positive electrode sheet, and controls the corresponding camera module to photograph the composite sheet according to the number of the camera module to be activated to obtain multiple composite sheet images. Also, there are multiple camera modules, and the multiple camera modules are installed on both sides of the composite sheet conveying device, with different camera module numbers corresponding to different camera modules. Each camera module includes at least two third cameras.

[0094] According to some embodiments of the present application, as shown in FIG. 11 , the present application provides an electronic device 11. The electronic device 11 includes a processor 1101 and a memory 1102. The processor 1101 is communicatively connected to the memory 1102 via a communication bus 1103 and / or other type of connection mechanism (not shown). The memory 1102 stores a computer program executable by an external device. When the computing device is operated, the program is executed by the processor 1101 to perform a method in any one of implementation modes, such as steps S300 to S330, in which image information of a positive electrode sheet is acquired, image information of a composite sheet is acquired, and size information of a composite surface is calculated based on the image information of the positive electrode sheet and the image information of the composite sheet using an image processing algorithm.

[0095] The present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the method in any one of the above implementations to be performed.

[0096] The storage medium can be realized by any type of volatile or non-volatile memory or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic memory, a flash memory, a magnetic disk, or an optical disk.

[0097] The present application provides a computer program product which, when executed on a computer, causes the computer to perform the method in any one of the implementations.

[0098] Finally, it should be noted that the above examples are merely intended to illustrate the technical solutions of the present application and are not intended to limit the same. Although the present application has been described in detail with reference to the above examples, those skilled in the art may modify the technical solutions described in the above examples and may equivalently replace some or all of the technical features therein. Such modifications or replacements do not deviate from the scope of the technical solutions of the examples of the present application, and are all within the scope of the claims and the description of the present application. In particular, as long as there is no structural contradiction, the technical features mentioned in the examples can be combined in any manner. The present application is not limited to the specific examples disclosed herein and includes all technical solutions encompassed by the claims. [Explanation of symbols]

[0099] 10...Camera module 110...First camera group 120...Second camera group 20...Transportation equipment 210...Positive electrode sheet conveying device 220...Composite sheet conveying device 30...Data processing equipment 1000...Acquisition module 1100...Image processing module 1200...Judgment module 1300...Generation module 11 …electronic equipment 1101 …processor 1102 …memory 1103 …Communication bus Y1...Positive electrode sheet Y1A1: Polar area on the first surface of the positive electrode sheet Y1A2: Ceramic area on the first surface of the positive electrode sheet Y1A3...Tab on the first side of the positive electrode sheet Y1B1...Polar area on the second surface of the positive electrode sheet Y1B2 …ceramic area on the second surface of the positive electrode sheet Y1B3 ...Tab on the second side of the positive electrode sheet Y2...Negative electrode sheet G1...Separator F1...Composite seat

Claims

1. A method for detecting the size of a composite surface of a battery, comprising: The battery includes a composite sheet, and the composite sheet includes a positive electrode sheet, a separator, a negative electrode sheet, a separator, and a positive electrode sheet, which are stacked in this order. A method for detecting the size of the composite surface of the battery includes: acquiring image information of the positive electrode sheet, including an image of a first surface of the positive electrode sheet and an image of a second surface opposite to the first surface, before the positive electrode sheet, the separator, and the negative electrode sheet are combined; a step of acquiring image information of the composite sheet after the positive electrode sheet, the separator, and the negative electrode sheet are combined, the composite sheet including a non-composite side and a composite side, the information of the non-composite side including information of the first side of the positive electrode sheet, the negative electrode, and the separator, and the information of the composite side including information of the second side of the positive electrode sheet, the negative electrode, and the separator; and calculating size information of the composite surface based on image information of the positive electrode sheet before the positive electrode sheet, the separator, and the negative electrode sheet are combined and image information of the composite sheet using an image processing algorithm; The composite sheet image information includes the non-composite surface image information. A method for detecting the size of a composite surface of a battery.

2. The size information of the composite surface includes a distance from a positive electrode edge to a negative electrode edge in the composite surface, the positive electrode edge being an edge of a polar region of a positive electrode sheet, and the negative electrode edge being an edge of a negative electrode sheet.

2. The method of claim 1 .

3. The first surface of the positive electrode sheet includes, in order, a polar region on the first surface of the positive electrode sheet, a ceramic region on the first surface of the positive electrode sheet, and a tab on the first surface of the positive electrode sheet; and the second surface of the positive electrode sheet includes, in order, a polar region on the second surface of the positive electrode sheet, a ceramic region on the second surface of the positive electrode sheet, and a tab on the second surface of the positive electrode sheet; The step of calculating size information of the composite surface based on image information of the positive electrode sheet before the positive electrode sheet, the separator, and the negative electrode sheet are combined and image information of the composite sheet using an image processing algorithm includes: calculating, by an image processing algorithm, a deviation amount representing the difference between the distance from the positive electrode edge to the ceramic edge on the first surface of the positive electrode sheet and the distance from the positive electrode edge to the ceramic edge on the second surface of the positive electrode sheet, based on the image of the first surface and the image of the second surface of the positive electrode sheet; calculating a distance from a positive edge to a negative edge on the non-composite surface based on image information of the composite sheet; and calculating a distance from a positive electrode edge to a negative electrode edge in the composite surface based on the distance from a positive electrode edge to a negative electrode edge in the non-composite surface and the deviation amount, The ceramic edge is the edge of the ceramic region that is away from the polar region of the positive electrode sheet.

3. The method of claim 2.

4. calculating a deviation amount based on an image of the first surface and an image of the second surface of the positive electrode sheet using an image processing algorithm, Recognizing and calculating a first distance from a positive electrode edge to a ceramic edge on the first surface of the positive electrode sheet based on an image of the first surface of the positive electrode sheet using an image processing algorithm; recognizing and calculating a second distance from a positive electrode edge to a ceramic edge on the second surface of the positive electrode sheet based on an image of the second surface of the positive electrode sheet; calculating a difference between the first distance and the second distance to obtain the deviation amount.

4. The method of claim 3.

5. The step of recognizing and calculating a first distance from a positive electrode edge to a ceramic edge on the first surface of the positive electrode sheet based on an image of the first surface of the positive electrode sheet using an image processing algorithm includes: Recognizing a positive electrode edge and a ceramic edge in an image of the first surface of the positive electrode sheet using an image recognition algorithm; calculating a distance from the recognized positive electrode edge to the ceramic edge to obtain a first distance; 5. The method of claim 4.

6. the composite sheet image information includes a plurality of composite sheet images, each of the composite sheet images including one corner of the composite sheet, and different composite sheet images including different corners of the composite sheet; The step of calculating the distance from the positive edge to the negative edge on the non-composite surface based on the image information of the composite sheet includes: calculating, based on each of the composite sheet images, a distance from a positive edge to a negative edge of a non-composite surface in the corresponding composite sheet image; The step of calculating the distance from the positive electrode edge to the negative electrode edge on the composite surface based on the distance from the positive electrode edge to the negative electrode edge on the non-composite surface and the deviation amount, calculating a difference between the distance from the positive edge to the negative edge of the non-composite surface corresponding to each composite sheet image and the deviation amount, thereby obtaining the distance from the positive edge to the negative edge of the composite surface in each composite sheet image; 4. The method of claim 3.

7. After calculating size information of the composite surface based on the image information of the positive electrode sheet and the image information of the composite sheet using an image processing algorithm, determining whether the size information of the composite surface satisfies a predetermined criterion; and generating a reconfirmation suggestion for the composite sheet if the size information of the composite surface does not meet a predetermined standard.

2. The method of claim 1 .

8. The step of acquiring image information of the positive electrode sheet includes: controlling the first camera and the second camera to capture images of the first surface and the second surface of the positive electrode sheet, and obtaining an image of the first surface and an image of the second surface opposite to the first surface of the positive electrode sheet; The first and second cameras are installed on both sides of the positive electrode sheet conveying device.

2. The method of claim 1 .

9. The step of acquiring image information of the composite sheet includes: Obtaining the number of the positive electrode sheet; Identifying the number of the camera module to be activated based on the number of the positive electrode sheet; and controlling the corresponding camera module to photograph the composite sheet according to the number of the camera module to be activated, thereby obtaining a plurality of composite sheet images; There are a plurality of camera modules, and the plurality of camera modules are installed on both sides of the composite sheet transport device, and different camera modules correspond to different camera module numbers, and each camera module includes at least two third cameras.

2. The method of claim 1 .

10. A battery composite surface size detection device, comprising: The battery includes a composite sheet, and the composite sheet includes a positive electrode sheet, a separator, a negative electrode sheet, a separator, and a positive electrode sheet, which are stacked in this order; The battery composite surface size detection device includes an acquisition module and an image processing module; the acquisition module is for acquiring image information of the positive electrode sheet before the positive electrode sheet, the separator, and the negative electrode sheet are combined, the image information including an image of a first surface of the positive electrode sheet and an image of a second surface opposite to the first surface; The acquisition module further acquires image information of the composite sheet after the positive electrode sheet, the separator, and the negative electrode sheet are combined, the composite sheet including a non-composite surface and a composite surface, the information of the non-composite surface including information of the first surface of the positive electrode sheet, the negative electrode, and the separator, and the information of the composite surface including information of the second surface of the positive electrode sheet, the negative electrode, and the separator; the image processing module is for calculating size information of a composite surface based on image information of the positive electrode sheet before the positive electrode sheet, the separator, and the negative electrode sheet are combined and image information of the composite sheet, using an image processing algorithm; The composite sheet image information includes the non-composite surface image information. A size detection device for a composite surface of a battery, characterized in that

11. a processor; a memory storing a computer program that, when executed by the processor, causes the computer to implement the method of any one of claims 1 to 9; An electronic device characterized by:

12. A computer program is stored which, when executed by a processor, implements the method according to any one of claims 1 to 9. A computer-readable storage medium comprising:

13. A size detection system for a composite surface of a battery, the system including a camera module, a conveying device, and a data processing device, the data processing device being electrically connected to the camera module, the battery including a composite sheet, the composite sheet including a positive electrode sheet, a separator, a negative electrode sheet, a separator, and a positive electrode sheet, which are stacked in this order; the conveying device is for conveying a positive electrode sheet and a composite sheet, the composite sheet including a non-composite surface and a composite surface; the data processing device controls the camera module to capture an image of the positive electrode sheet in the conveying device before the positive electrode sheet, the separator, and the negative electrode sheet are combined together, and acquires image information of the positive electrode sheet including an image of a first surface of the positive electrode sheet and an image of a second surface opposite to the first surface; the data processing device further controls the camera module to photograph the composite sheet in the conveying device after the positive electrode sheet, the separator, and the negative electrode sheet are combined, and acquires image information of the composite sheet including image information of the non-composite surface; the information on the non-composite surface includes information on the first surface of the positive electrode sheet, the negative electrode, and the separator, and the information on the composite surface includes information on the second surface of the positive electrode sheet, the negative electrode, and the separator; The data processing device further calculates size information of the composite surface based on image information of the positive electrode sheet before the positive electrode sheet, the separator, and the negative electrode sheet are combined and image information of the composite sheet using an image processing algorithm. A size detection system for a composite surface of a battery, comprising:

Images