Detection system, method, device, equipment, storage medium and program product

Abstract

The invention relates to a detection system, method and device, equipment, a storage medium and a program product. The shooting device shoots the target object at the current station to obtain a shot image, the shot image is sent to the detection equipment, and the detection equipment determines at least one lithium precipitation type of strip-shaped lithium precipitation, linear lithium precipitation, bubble-shaped lithium precipitation and point-shaped lithium precipitation of the lithium precipitation area on the anode pole piece according to the shot image; the target object comprises an anode pole piece obtained after the battery cell is disassembled. The lithium precipitation area on the anode pole piece does not need to be detected visually, so that the detection efficiency of the lithium precipitation type of the lithium precipitation area on the anode pole piece obtained by disassembling the battery cell is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pole piece detection, in particular to a detection system, method, device, equipment, storage medium and program product. BACKGROUND

[0002] Lithium ion batteries have been widely used in key fields such as new energy vehicles and energy storage systems due to their high energy density and long cycle life. Among them, the winding type battery cell has become the mainstream configuration due to its compact structure and high production efficiency. However, under complex working conditions such as overcharge and thermal runaway, the battery may fail. Therefore, the failure mechanism research of the failed battery is a core link of optimizing the battery.

[0003] In the failure mechanism research, the anode pole piece in the battery is prone to lithium deposition under complex working conditions, which leads to battery failure. Therefore, the type of lithium deposition on the anode pole piece is a key link in the entire detection process. At present, the artificial visual detection method is used to determine the type of lithium deposition on the anode pole piece after the battery cell is disassembled. However, there is a problem of low detection efficiency of the lithium deposition type. SUMMARY

[0004] Therefore, it is necessary to provide a detection system, method, device, equipment, storage medium and program product capable of improving the detection efficiency of the lithium deposition type of the lithium deposition area on the anode pole piece obtained by disassembling the battery cell.

[0005] In a first aspect, the present application provides a detection system, which comprises:

[0006] a shooting device configured to shoot a target object at a current station to obtain a shooting image and send the shooting image to a detection device; the target object comprises an anode pole piece obtained by disassembling a battery cell;

[0007] the detection device is configured to determine a lithium deposition type of a lithium deposition area on the anode pole piece according to the shooting image; the lithium deposition type comprises at least one of a strip-shaped lithium deposition, a line-shaped lithium deposition, a bubble-shaped lithium deposition and a point-shaped lithium deposition;

[0008] The detection system further comprises:

[0009] a controller configured to send a control instruction to a driving device when the shooting device completes shooting at the current station;

[0010] the driving device is configured to drive the shooting device to move a preset distance along a first direction of the anode pole piece and then reach a next station in response to the control instruction; the length of the first direction of the anode pole piece is greater than the length of a second direction of the anode pole piece;

[0011] The shooting device is further configured to shoot the anode pole piece at the next station to obtain a next shooting image.

[0012] In the embodiment, the photographing device photographs the target object at the current station to obtain a photographing image, and sends the photographing image to the detection equipment. The detection equipment determines at least one of strip-shaped lithium precipitation, line-shaped lithium precipitation, bubble-shaped lithium precipitation, and point-shaped lithium precipitation of the lithium precipitation region on the anode sheet according to the photographing image. The target object includes the anode sheet obtained after the battery cell is disassembled. The lithium precipitation region on the anode sheet is detected without manual visual inspection, and the detection efficiency of the lithium precipitation type of the lithium precipitation region on the anode sheet obtained after the battery cell is disassembled is improved. Moreover, the driving device drives the photographing device to move a preset distance along the first direction of the anode sheet to reach the next station in response to the control instruction sent by the controller. The photographing device photographs the anode sheet at the next station to obtain a next photographing image, the entire length of the anode sheet in the first direction is photographed, and subsequent analysis of the photographing image of any region of the anode sheet is facilitated. The lithium precipitation region is obtained, and the lithium precipitation type is determined based on the lithium precipitation region of the anode sheet. The lithium precipitation region of the entire anode sheet is comprehensively detected.

[0013] In one of the embodiments, the detection system further includes a frame, and the driving device includes:

[0014] A transmission mechanism including a first fitting member and a second fitting member in mesh transmission, the first fitting member being mounted to the frame and extending along the first direction;

[0015] A driving member slidingly fitted to the frame along the first direction, the photographing device being mounted to the driving member, the driving member being connected with the second fitting member and configured to drive the second fitting member to rotate so as to drive the driving member and the second fitting member to move along the first direction.

[0016] In the embodiment, the driving device including the transmission mechanism and the driving member can drive the photographing device to move along the first direction, so that the photographing device photographs different regions of the anode sheet in the first direction at different stations.

[0017] In one of the embodiments, the photographing device includes:

[0018] A light source assembly connected with the driving member and configured to provide illumination for a photographing environment in which the photographing device is located;

[0019] A camera assembly connected with the driving member and configured to photograph the target object under the illumination provided by the light source assembly. The target object further includes at least one of surfaces of the battery cell, surfaces of a bare battery cell obtained after the shell of the battery cell is peeled off, and at least one of a cathode sheet and a separator film obtained after the battery cell is disassembled.

[0020] In the embodiment, the light source assembly can provide illumination for the shooting environment in which the shooting device is located, so that the camera assembly can take a photograph of the target object under the illumination of the light source assembly, and a clearer shooting image can be obtained, thereby facilitating subsequent use of the clear shooting image to obtain a more accurate analysis result.

[0021] In one of the embodiments, the camera assembly comprises:

[0022] a distance measuring sensor connected to the zoom lens of the camera assembly, configured to measure the distance between the zoom lens and the target object;

[0023] a zoom lens, configured to adjust the focusing position of the zoom lens on the target object according to the distance;

[0024] an indicator light, configured to form a light spot on the target object, the light spot being used to indicate the focusing position of the zoom lens.

[0025] In the embodiment, the focusing position of the zoom lens on the target object can be automatically adjusted by the zoom lens, so that the obtained shooting image is clearer, and the light spot indicating the focusing position of the zoom lens can be formed on the target object by the indicator light, thereby facilitating the staff to determine whether the zoom lens has completed automatic focusing according to the position of the light spot.

[0026] In one of the embodiments, the light source assembly comprises:

[0027] a cover connected to the driving member, the cover forming a chamber for accommodating the light source body;

[0028] a light source body, connected to a light source controller located outside the chamber through a cable assembly passing through a through hole provided on the cover;

[0029] a cable assembly, comprising a cable and a cable introduction assembly, the cable introduction assembly being used to clamp the cable and seal the gap at the through hole.

[0030] The light source assembly in the embodiment not only provides illumination for the shooting environment, but also can be applied to the detection environment in which the detection system is located.

[0031] In one of the embodiments, the detection device is configured to determine the lithium precipitation type on the anode sheet based on the shooting image of the anode sheet and a detection model.

[0032] In the embodiment, the detection model can be used to identify the lithium precipitation type on the shooting image of the anode sheet. Since the detection model has high detection accuracy, the accuracy of the obtained lithium precipitation type on the anode sheet can be improved.

[0033] In one of the embodiments, the detection device is configured to acquire an image sample of the anode sheet sample obtained after disassembling the battery cell sample and an actual lithium precipitation type sample corresponding to the image sample, train an initial detection model based on the image sample and the actual lithium precipitation type sample to obtain the detection model; and the actual lithium precipitation type sample includes at least one of a strip-shaped lithium precipitation sample, a line-shaped lithium precipitation sample, a bubble-shaped lithium precipitation sample, and a point-shaped lithium precipitation sample.

[0034] In the embodiment, the detection device acquires an image sample of the anode sheet sample obtained after disassembling the battery cell sample and an actual lithium precipitation type sample corresponding to the image sample, trains an initial detection model based on the image sample and the actual lithium precipitation type sample to obtain the detection model, and improves the detection accuracy of the detection model, thereby improving the accuracy of the lithium precipitation type of the lithium precipitation area obtained by the detection model in detecting the photographed image.

[0035] In one of the embodiments, the detection device is configured to input the image sample into the initial detection model to obtain a predicted lithium precipitation type output by the initial detection model, determine a difference between the predicted lithium precipitation type and the actual lithium precipitation type sample, and train the initial detection model based on the difference to obtain the detection model.

[0036] In the embodiment, the initial detection model is trained based on the difference between the predicted lithium precipitation type and the actual lithium precipitation type sample to obtain the detection model, the actual lithium precipitation type sample provides an explicit learning target and quantitative feedback for the detection model, the detection model can efficiently learn the mapping relationship between the input and the output, and thus more accurate lithium precipitation types can be output in actual detection.

[0037] In one of the embodiments, the detection device is configured to determine lithium precipitation areas of each lithium precipitation area, determine a total lithium precipitation area according to the lithium precipitation areas of each lithium precipitation area corresponding to a same lithium precipitation type, and determine a lithium precipitation level of the anode sheet area corresponding to the photographed image according to a total number of each lithium precipitation area corresponding to the same lithium precipitation type, the total lithium precipitation area, and a maximum lithium precipitation area in the lithium precipitation areas corresponding to the same lithium precipitation type.

[0038] In the embodiment, the detection device determines lithium precipitation areas of each lithium precipitation area, determines a total lithium precipitation area according to the lithium precipitation areas of each lithium precipitation area corresponding to a same lithium precipitation type, and determines a lithium precipitation level of the anode sheet area corresponding to the photographed image according to a total number of each lithium precipitation area corresponding to the same lithium precipitation type, the total lithium precipitation area, and a maximum lithium precipitation area in the lithium precipitation areas corresponding to the same lithium precipitation type, thereby obtaining the severity of the lithium precipitation of the anode sheet area corresponding to the photographed image, and tracing the battery cell based on the severity of the lithium precipitation to improve the performance of the battery cell.

[0039] In one of the embodiments, the detection device is configured to splice the photographed images of the anode pole piece obtained at each station to obtain a spliced image, and determine the number of winding turns of the photographed image with the lithium precipitation area in the battery cell based on a quotient value obtained by dividing the position coordinate of the photographed image with the lithium precipitation area in the spliced image by the total length of the anode pole piece.

[0040] In the embodiment, the detection device is configured to splice the photographed images of the anode pole piece obtained at each station to obtain a spliced image, and determine the number of winding turns of the photographed image with the lithium precipitation area in the battery cell based on a quotient value obtained by dividing the position coordinate of the photographed image with the lithium precipitation area in the spliced image by the total length of the anode pole piece, so as to facilitate subsequent rapid tracing of the position of the lithium precipitation area in the spliced image based on the number of winding turns.

[0041] In a second aspect, the application further provides a detection method, which is applied to a detection device in a detection system and includes the following steps.

[0042] receiving a photographed image of a target object sent by a photographing device in the detection system; the photographed image is an image obtained by photographing the target object at a current station by the photographing device, and the target object includes an anode pole piece obtained by disassembling a battery cell;

[0043] determining a lithium precipitation type of a lithium precipitation area on the anode pole piece according to the photographed image; the lithium precipitation type includes at least one of a strip-shaped lithium precipitation, a line-shaped lithium precipitation, a bubble-shaped lithium precipitation, and a point-shaped lithium precipitation;

[0044] The method further includes the following steps.

[0045] in a case where the photographing is completed at the current station by the photographing device, sending a photographing completion signal to a controller in the detection system; the photographing completion signal is used to instruct the controller to send a control instruction to a driving device in the detection system, and the control instruction is used to instruct the driving device to control the photographing device to move a preset distance along a first direction of the anode pole piece and then reach a next station of the current station, so as to obtain a next photographed image by photographing the anode pole piece at the next station;

[0046] receiving the next photographed image sent by the photographing device.

[0047] In a third aspect, the application further provides a detection device. The detection device is arranged in a detection device in a detection system and includes the following components.

[0048] a receiving module, configured to receive a photographed image of a target object sent by a photographing device in the detection system; the photographed image is an image obtained by photographing the target object at a current station by the photographing device, and the target object includes an anode pole piece obtained by disassembling a battery cell;

[0049] The first determining module is configured to determine a lithium precipitation type of the lithium precipitation area on the anode pole piece according to the photographed image, the lithium precipitation type including at least one of a strip-shaped lithium precipitation, a line-shaped lithium precipitation, a bubble-shaped lithium precipitation, and a dot-shaped lithium precipitation.

[0050] The sending module is configured to send, to a controller in the detection system, a photographing completion signal in a case where the photographing of the photographing device at the current station is completed, the photographing completion signal being used to instruct the controller to send a control instruction to a driving device in the detection system, the control instruction being used to instruct the driving device to drive the photographing device to move a preset distance along the first direction of the anode pole piece and then to reach a next station of the current station, and to photograph the anode pole piece at the next station to obtain a next photographed image.

[0051] The receiving module is further configured to receive the next photographed image sent by the photographing device.

[0052] In a fourth aspect, the present application further provides a computer device. The computer device comprises a memory and a processor, the memory stores a computer program, and the processor executes the steps of any of the above methods.

[0053] In a fifth aspect, the present application further provides a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program is executed by a processor to execute the steps of any of the above methods.

[0054] In a sixth aspect, the present application further provides a computer program product. The computer program product comprises a computer program, and the computer program is executed by a processor to execute the steps of any of the above methods.

[0055] The above description is only a summary of the technical solutions of the present application. In order to enable one of ordinary skill in the art to better understand the technical means of the present application and implement it according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent, the following detailed description of the preferred embodiments of the present application is provided. BRIEF DESCRIPTION OF DRAWINGS

[0056] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar elements. In the drawings:

[0057] Figure 1 FIG. 1 is a structural schematic diagram of a detection system provided by an embodiment of the present application;

[0058] Figure 2 FIG. 2 is a structural schematic diagram of another detection system provided by an embodiment of the present application;

[0059] Figure 3is a whole structure schematic diagram of a driving device and a shooting device provided by an embodiment of the present application;

[0060] Figure 4 is a structure schematic diagram of a camera assembly of a view angle provided by an embodiment of the present application;

[0061] Figure 5 is a structure schematic diagram of a camera assembly of another view angle provided by an embodiment of the present application;

[0062] Figure 6 is a structure schematic diagram of a light source assembly provided by an embodiment of the present application;

[0063] Figure 7 is a flow schematic diagram of a detection method provided by an embodiment of the present application;

[0064] Figure 8 is a structure schematic diagram of a detection device provided by an embodiment of the present application;

[0065] Figure 9 is an internal structure diagram of a computer device in an embodiment. DETAILED DESCRIPTION

[0066] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0067] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0069] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0070] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects have an“or” relationship.

[0071] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0072] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the application.

[0073] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0074] Lithium-ion batteries have been widely used in key fields such as new energy vehicles and energy storage systems due to their high energy density and long cycle life. Among them, the winding type battery cell has become the mainstream configuration due to its compact structure and high production efficiency. However, under complex working conditions such as overcharging and thermal runaway, the battery may fail. Therefore, the failure mechanism research of the failed battery is a core link for optimizing the battery design.

[0075] In the failure mechanism research, the anode tab in the battery is prone to lithium deposition under complex working conditions, leading to battery failure. Disassembly of the failed battery or used battery, tab extraction and interface feature analysis of the tab are key links to reveal the failure source. Overcharge resistance test interface classification (ORT) is a core evaluation index. ORT is a scientific classification system based on the damage degree of electrode / electrolyte interface under overcharge condition. Its core is to quantify the interface failure risk through multi-dimensional electrochemical, physical and chemical characteristic parameters, providing key decision support for safety evaluation, failure tracing and recycling gradient utilization in the whole life cycle of the battery.

[0076] Currently, the lithium deposition information on the anode tab obtained after disassembly of the battery cell is analyzed by manual visual method, and the lithium deposition type is estimated based on the lithium deposition information. However, there is a problem of low lithium deposition type detection efficiency.

[0077] To solve the above problems, the embodiments of the present application provide a detection system, as shown in Figure 1 Figure 1 It is a structural schematic diagram of a detection system provided by the embodiments of the present application. The detection system comprises a shooting device 11 and a detection device 12; the detection device can be a computer device.

[0078] The shooting device 11 is used for shooting the target object at the current station to obtain a shooting image, and sending the shooting image to the detection device 12; the target object includes the anode tab obtained after disassembly of the battery cell;

[0079] The detection device 12 is used for determining the lithium deposition type of the lithium deposition area on the anode tab according to the shooting image; the lithium deposition type includes at least one of strip-shaped lithium deposition, linear lithium deposition, bubble-shaped lithium deposition and point-shaped lithium deposition.

[0080] The length of the anode tab obtained after disassembly of the battery cell in the first direction is relatively long, and the field of view of the shooting device cannot cover all areas of the length in the first direction, that is, the shooting device can shoot part of the area of the anode tab in the first direction at the current station, that is, the shooting image obtained at the current station is a partial area image of the anode tab. After shooting at the current station is completed, the shooting device can be moved to the next station, and the anode tab is shot at the next station to obtain a next shooting image, until all areas of the length in the first direction are shot. The length of the anode tab in the first direction is greater than the length of the anode tab in the second direction, which can be achieved by manually moving the shooting device to the next station, or by driving the shooting device to move to the next station.

[0081] ​The detection device can recognize a lithium precipitation area in the photographed image by using a Canny edge detection method or an Otsu threshold segmentation method according to the photographed image, and determine the lithium precipitation type of the lithium precipitation area as the preset lithium precipitation type in a case where the lithium precipitation area meets preset conditions corresponding to the preset lithium precipitation type.

[0082] The preset lithium precipitation type can include strip-shaped lithium precipitation, line-shaped lithium precipitation, bubble-shaped lithium precipitation, and point-shaped lithium precipitation.

[0083] For example, if the preset condition corresponding to the bubble-shaped lithium precipitation in the preset lithium precipitation type is that the diameter is not less than 0.1 mm and the bubble-shaped lithium precipitation is in a bubble convex shape, the diameter of a certain lithium precipitation area is not less than 0.1 mm and the bubble-shaped lithium precipitation is in a bubble convex shape, that is, the lithium precipitation area meets the preset condition corresponding to the bubble-shaped lithium precipitation, the lithium precipitation type of the lithium precipitation area can be determined as the bubble-shaped lithium precipitation.

[0084] If the preset condition corresponding to the point-shaped lithium precipitation in the preset lithium precipitation type is that the diameter is not less than 0.05 mm and not more than 0.1 mm and the point-shaped lithium precipitation is in a discrete point shape, the diameter of a certain lithium precipitation area is not less than 0.05 mm and not more than 0.1 mm, that is, the lithium precipitation area meets the preset condition corresponding to the point-shaped lithium precipitation, the lithium precipitation type of the lithium precipitation area can be determined as the point-shaped lithium precipitation.

[0085] If the preset condition corresponding to the strip-shaped lithium precipitation in the preset lithium precipitation type is that the width is not less than 0.05 mm and the length is not less than 0.5 mm, the width of a certain lithium precipitation area is not less than 0.05 mm and the length of the lithium precipitation area is not less than 0.5 mm, that is, the lithium precipitation area meets the preset condition corresponding to the strip-shaped lithium precipitation, the lithium precipitation type of the lithium precipitation area can be determined as the strip-shaped lithium precipitation.

[0086] If the preset condition corresponding to the line-shaped lithium precipitation in the preset lithium precipitation type is that the width is not less than 0.02 mm and not more than 0.05 mm and the length is not less than 1 mm, the width of a certain lithium precipitation area is not less than 0.02 mm and not more than 0.05 mm and the length of the lithium precipitation area is not less than 1 mm, that is, the lithium precipitation area meets the preset condition corresponding to the line-shaped lithium precipitation, the lithium precipitation type of the lithium precipitation area can be determined as the line-shaped lithium precipitation.

[0087] As shown in Figure 1 and Figure 2 , the detection system provided by the embodiment of the present application can further include: Figure 2 is a structural schematic diagram of another detection system provided by the embodiment of the present application. The detection system can further include:

[0088] The controller 13 is configured to send a control instruction to the driving device 21 in a case where the photographing device 11 completes photographing at the current station.

[0089] The driving device 21 is configured to drive the photographing device 11 to move a preset distance along the first direction of the anode pole piece in response to a control instruction, and reach a next station; the length of the first direction of the anode pole piece is greater than the length of the second direction of the anode pole piece.

[0090] The photographing device 11 is further configured to photograph the anode pole piece at the next station to obtain a next photographing image.

[0091] The controller 13 can be a programmable logic controller (PLC). After the photographing device finishes photographing, the photographing device can send the photographing image to the detection device. The detection device determines that the photographing device finishes photographing according to the received photographing image, and sends a photographing completion signal to the controller 13. The controller determines that the photographing device finishes photographing at the current station according to the photographing completion signal. The controller sends a control instruction to the driving device when the photographing device finishes photographing at the current station.

[0092] Alternatively, after the photographing device finishes photographing, the photographing device sends a photographing completion signal to the controller. The controller determines that the photographing device finishes photographing at the current station in response to the photographing completion signal sent by the photographing device. The controller sends a control instruction to the driving device when the photographing device finishes photographing at the current station.

[0093] When the current station where the photographing device is located is a starting station, the controller can receive a manually triggered photographing instruction, and control the photographing device to start photographing in response to the photographing instruction.

[0094] When the photographing device finishes photographing at the current station, the controller can control the photographing device to move through the driving device. The controller can determine whether the distance moved by the photographing device is equal to the preset distance. When the distance moved by the photographing device is equal to the preset distance, it is determined that the photographing device reaches the photographing station. When it is determined that the photographing device reaches the photographing station, the photographing device is controlled to start photographing.

[0095] For example, if the photographing device photographs once every 0.5 meters of movement, when the controller controls the photographing device to move 0.5 meters through the driving device, the photographing device is controlled to stop moving, and it is determined that the photographing device reaches the next station, i.e., the photographing device reaches the photographing station, and the photographing device is controlled to start photographing.

[0096] When the anode pole piece or the cathode pole piece is photographed, the pole flatness of the anode pole piece or the cathode pole piece can be controlled so that all points on the pole surface are within the depth of field of the photographing device, so as to improve the clarity of the obtained image. The pole flatness is, for example, ≤2 millimeters.

[0097] In this embodiment, the photographing device photographs the target object at the current station to obtain a photographed image, and sends the photographed image to the detection device. The detection device determines at least one lithium precipitation type of the lithium precipitation region on the anode sheet from the photographed image, including strip-shaped lithium precipitation, line-shaped lithium precipitation, bubble-shaped lithium precipitation, and point-shaped lithium precipitation. The target object includes the anode sheet obtained after the battery cell is disassembled. The lithium precipitation region on the anode sheet is detected without manual visual inspection, improving the detection efficiency of the lithium precipitation type of the lithium precipitation region on the anode sheet obtained after the battery cell is disassembled. Moreover, the driving device drives the photographing device to move a preset distance along the first direction of the anode sheet to reach the next station in response to the control instruction sent by the controller. The photographing device photographs the anode sheet at the next station to obtain a next photographed image, realizes photographing of the entire length of the anode sheet in the first direction, and facilitates subsequent analysis of the photographed image of any region of the anode sheet to obtain the lithium precipitation region, and further determines the lithium precipitation type based on the lithium precipitation region of the anode sheet, and realizes comprehensive detection of the lithium precipitation region of the entire anode sheet.

[0098] In one embodiment, a schematic diagram of the overall structure of the driving device and the photographing device is also provided, Figure 3 is a schematic diagram of the overall structure of the driving device and the photographing device provided by the embodiment of the present application. As Figure 2 and 3 shown, the detection system further includes a frame 23, and the driving device includes:

[0099] A transmission mechanism includes a first fitting member and a second fitting member in meshing transmission. The first fitting member is mounted on the frame 23, and the first fitting member extends along the first direction.

[0100] A driving member is slidingly fitted to the frame 23 along the first direction. The photographing device is mounted on the driving member. The driving member is connected with the second fitting member, and is used to drive the second fitting member to rotate, so that the driving member and the second fitting member move along the first direction.

[0101] The photographing device can be directly connected with the driving member, realizing that the photographing device is mounted on the driving member. Alternatively, the driving device can further include a support member 31. The photographing device can be connected to the support member 31. The driving member is connected to the support member 31, realizing that the photographing device is mounted on the driving member.

[0102] The driving member can be an electric motor, a motor, a rotary cylinder, etc. Figure 3The motor 32 shown can be mounted on the support member 31. The motor 32 is connected to the second mating member and is used to drive the second mating member to rotate, so that the driving member and the second mating member move along the first direction, thereby driving the shooting device to move along the first direction. The support member 31 may be provided with a slider, and the frame 23 is provided with a slide rail extending along the first direction. The slider and the slide rail slide in cooperation along the first direction, thereby enabling the shooting device to move along the first direction when the driving member and the second mating member move along the first direction.

[0103] The structure of the slider and the slide rail can also be replaced by a slider groove, or a guide sleeve and a guide rod, etc.

[0104] For example, such as Figure 2 As shown, the transmission mechanism may include a rack 22 as the first mating component and a gear as the second mating component. The gear meshes with the rack 22, and the motor 32 drives the gear to rotate, so that the motor 32 and the gear move in a first direction, thereby driving the shooting device to move in the first direction. Alternatively, the transmission mechanism may include a chain as the first mating component and a sprocket as the second mating component.

[0105] In one embodiment, the driving component can be fixedly installed on the frame 23, and the shooting device can be connected to the rack 22. The driving component drives the gear to rotate, thereby driving the rack and the shooting device to move in the first direction.

[0106] It should be noted that the shooting device can also be moved by a drive component via a belt drive structure or by a drive component via a lead screw structure.

[0107] In this embodiment, a driving device including a transmission mechanism and a driving component can drive the imaging device to move along the first direction, thereby enabling the imaging device to capture images of different areas of the anode sheet in the first direction at different work positions.

[0108] In one embodiment, such as Figure 3 As shown, the shooting device includes:

[0109] The light source assembly 33 is connected to the support member 31 and is used to provide illumination for the shooting environment where the shooting device is located.

[0110] The camera assembly 34 is used to take pictures of the target object when the light source assembly 33 provides illumination; the target object also includes each surface of the battery cell, each surface of the bare battery cell obtained after peeling off the outer casing of the battery cell, and at least one of the cathode electrode and the separator obtained after disassembling the battery cell.

[0111] The camera can be a line scan camera or a charge-coupled device (CCD) camera. A higher camera resolution can be used for shooting to improve single-pixel accuracy, and in the case of a line scan camera, the entire length of the pole piece can be shot in one station without the need for subsequent splicing of multiple shot images to obtain an image of the entire length of the pole piece.

[0112] The blue insulating protective film wrapped outside the battery body in the battery cell packaging process is commonly referred to as a blue film in the industry, and is a native packaging component when the battery cell is shipped. When not peeled off, it forms an external protective structure with the battery shell. Using the detection system provided in the embodiments of the present application, each surface of the battery cell with the shell and the blue film can be shot to obtain a shot image of each surface. After shooting each surface of the battery cell with the shell and the blue film, the shell of the battery cell can be peeled off to obtain a bare battery cell, and each surface of each surface of the bare battery cell can be shot to obtain a shot image of each surface of the bare battery cell.

[0113] After obtaining the bare battery cell, the bare battery cell can be further disassembled to obtain the anode pole piece, the cathode pole piece and the separator film. The anode pole piece, the cathode pole piece and the separator film can be shot to obtain a shot image.

[0114] All the shot images obtained above can be saved in the file corresponding to the battery cell, which facilitates subsequent analysis of the shot images in the file.

[0115] In the embodiments, the light source assembly can provide illumination for the shooting environment of the shooting device, so that the camera assembly can shoot the target object under the illumination of the light source assembly, thereby obtaining a clearer shot image, which facilitates subsequent use of the clear shot image to obtain a more accurate analysis result.

[0116] In one embodiment, as shown in Figure 4 and 5 , Figure 4 is a structural schematic diagram of a camera assembly of one view provided in the embodiments of the present application, Figure 5 is a structural schematic diagram of a camera assembly of another view provided in the embodiments of the present application. The camera assembly 34 comprises:

[0117] a distance measuring sensor 51 connected with a zoom lens 52 of the camera assembly, for measuring the distance between the zoom lens 52 and the target object;

[0118] the zoom lens 52, for adjusting the focusing position of the zoom lens 52 on the target object according to the distance;

[0119] an indicator light 53, for forming a light spot on the target object; the light spot is used to indicate the focusing position of the zoom lens 52.

[0120] In this embodiment, the camera assembly 34 can include a camera and a zoom lens 52. The zoom lens 52 can be an electric zoom lens, and the ranging sensor can be an infrared ranging sensor. The zoom lens 52 can automatically adjust the focusing according to the distance between the different target objects and the zoom lens 52, and complete clear imaging. The implementation principle is that the infrared light emitted by the ranging sensor at the front end of the zoom lens 52 returns to the ranging sensor after reaching the target object. The ranging sensor can determine the time length between the emission of the infrared light and the reception of the signal returned by the target object. Based on the product of the time length and the speed of light, the distance between the target object and the zoom lens 52 can be determined. The motor mechanism inside the zoom lens 52 can adjust the focusing ring to the position at which the lens can clearly image at the distance, so as to realize automatic focusing.

[0121] The indicator light 53 can be a red indicator light, or an indicator light of other colors.

[0122] The zoom lens 52 can be connected to the camera in the camera assembly 34 through the interface 41, and the ranging sensor and the indicator light can be arranged at the front end of the zoom lens.

[0123] In this embodiment, the focusing position of the zoom lens on the target object can be automatically adjusted through the zoom lens, so that the obtained shooting image is clearer. In addition, the indicator light can form a light spot on the target object for indicating the focusing position of the zoom lens, so as to facilitate the staff to judge whether the zoom lens has completed automatic focusing according to the position of the light spot.

[0124] In one embodiment, as shown in Figure 6 , the structure of the light source assembly provided by the embodiment of the present application is shown in Figure 6 , which comprises:

[0125] an outer cover connected to the driving member, the outer cover forming a chamber for accommodating the light source body 63;

[0126] a light source body 63 connected to a light source controller located outside the chamber through a cable assembly passing through a through hole provided on the outer cover;

[0127] a cable assembly, the cable assembly comprising a cable and a cable introduction assembly 64, the cable introduction assembly 64 being used for clamping the cable and sealing the gap at the through hole.

[0128] The outer cover can include a first explosion-proof outer cover 61 and a second explosion-proof outer cover 62 arranged along a first direction, the first explosion-proof outer cover 61 and the second explosion-proof outer cover 62 being two end faces of the outer cover along the first direction, the first direction being a length direction of the outer cover. The first explosion-proof outer cover 61 and the second explosion-proof outer cover 62 can be made of a metal material with high strength, and can withstand the standard specified internal explosion pressure without permanent deformation or damage. The joint surface between the cover cap and the main body has strict processing requirements and high precision requirements to achieve the quenching effect when the flame passes through the gap, which is mainly determined by the gap length and the maximum gap. Among them, the outer cover other than the two end faces along the first direction can be made of ordinary materials or high-strength metal materials.

[0129] The light source body 63 can be an LED, preferably an LED with high photoelectric conversion efficiency and low heat generation rate, and a large-area metal heat sink is designed for heat dissipation to meet the explosion-proof requirement. A polarizing plate can be arranged close to the light outlet of the light source body on the light outlet path of the light source body, and the polarizing plate can play a filtering role.

[0130] The light source controller can be a component of the light source assembly or an independent controller outside the light source assembly, used to control whether the light source body emits light.

[0131] The cable introduction assembly 64 can include an explosion-proof flexible tube and an explosion-proof cable sealing joint. The through hole of the shell for the power supply line and the signal line and other cables is a weak point. The use of certified explosion-proof cable sealing joints ensures that the cable is tightly clamped and sealed. The cable can be inserted into the explosion-proof flexible tube, which can isolate the cable and prolong the service life of the cable.

[0132] The light source assembly in the embodiment not only provides illumination for the shooting environment, but also can be applied to the detection environment where the detection system is located.

[0133] In one embodiment, the detection device is used to determine the lithium precipitation type on the anode sheet based on the shooting image of the anode sheet and a detection model.

[0134] The detection model can include but is not limited to a Convolutional Neural Networks (CNN) model, a Recurrent Neural Network (RNN), a Fully Convolutional Neural Network (FCN) model, etc. For example, it can include a You Only Look Once Version 8 (YOLOv8) model.

[0135] In this embodiment, the type of lithium precipitation on the anode tab can be identified by the detection model. Since the detection accuracy of the detection model is high, the accuracy of the obtained type of lithium precipitation on the anode tab can be improved.

[0136] In one embodiment, a detection device is configured to obtain an image sample of an anode tab sample obtained after disassembly of a battery cell sample, and an actual lithium precipitation type sample corresponding to the image sample, train an initial detection model based on the image sample and the actual lithium precipitation type sample to obtain a detection model, and the actual lithium precipitation type sample includes at least one of a strip-shaped lithium precipitation sample, a line-shaped lithium precipitation sample, a bubble-shaped lithium precipitation sample, and a point-shaped lithium precipitation sample.

[0137] The image sample can be input into the initial detection model to obtain a lithium precipitation type prediction result, a difference between the lithium precipitation type prediction result and the actual lithium precipitation type sample is determined, and the parameters of the initial detection model are optimized based on the difference to obtain the detection model. By training the initial detection model to obtain the detection model, the accuracy of the detection model in detecting the photographed image and obtaining the lithium precipitation type can be improved.

[0138] In this embodiment, the detection device obtains an image sample of an anode tab sample obtained after disassembly of a battery cell sample, and an actual lithium precipitation type sample corresponding to the image sample, trains an initial detection model based on the image sample and the actual lithium precipitation type sample to obtain a detection model, and the detection accuracy of the detection model is improved, thereby improving the accuracy of the detection model in detecting the photographed image and obtaining the lithium precipitation type of the lithium precipitation area.

[0139] In one embodiment, a detection device is configured to input an image sample into an initial detection model to obtain a predicted lithium precipitation type output by the initial detection model, determine a difference between the predicted lithium precipitation type and an actual lithium precipitation type sample, and train the initial detection model based on the difference to obtain a detection model.

[0140] In this embodiment, the initial detection model is trained based on the difference between the predicted lithium precipitation type and the actual lithium precipitation type sample to obtain the detection model. The actual lithium precipitation type sample provides a clear learning target and quantitative feedback for the detection model, so that the detection model can efficiently learn the mapping relationship between the input and the output, thereby outputting more accurate lithium precipitation types in actual detection.

[0141] In one embodiment, a detection device is configured to determine lithium precipitation areas of each lithium precipitation area, determine a total lithium precipitation area according to the lithium precipitation areas of each lithium precipitation area corresponding to a same lithium precipitation type, and determine a lithium precipitation level of an anode tab area corresponding to the photographed image according to a total number of each lithium precipitation area corresponding to the same lithium precipitation type, the total lithium precipitation area, and a maximum lithium precipitation area corresponding to the same lithium precipitation type.

[0142] For the bubble-shaped lithium precipitation, the total number of the lithium precipitation regions, the total lithium precipitation area, and the maximum lithium precipitation area in the lithium precipitation regions of the bubble-shaped lithium precipitation in the photographed image obtained at one station can be determined.

[0143] For example, if the total number is less than or equal to the first preset number, the total lithium precipitation area is less than or equal to the first preset area, and the maximum lithium precipitation area is less than or equal to the first preset lithium precipitation area, it can be determined that the lithium precipitation degree of the bubble-shaped lithium precipitation on the photographed image is the first level. If the total number is greater than the first preset number and less than or equal to the second preset number, the total lithium precipitation area is greater than the first preset area and less than or equal to the second preset area, and the maximum lithium precipitation area is greater than the first preset lithium precipitation area and less than or equal to the second preset lithium precipitation area, it can be determined that the lithium precipitation degree of the bubble-shaped lithium precipitation on the photographed image is the second level. If the total number is greater than the second preset number, the total lithium precipitation area is greater than the second preset area, and the maximum lithium precipitation area is greater than the second preset lithium precipitation area, it can be determined that the lithium precipitation degree of the bubble-shaped lithium precipitation on the photographed image is the third level.

[0144] In this embodiment, the detection device determines the lithium precipitation area of each lithium precipitation region, determines the total lithium precipitation area according to the lithium precipitation area of each lithium precipitation region corresponding to the same lithium precipitation type, and determines the lithium precipitation level of the anode sheet region corresponding to the photographed image according to the total number of each lithium precipitation region corresponding to the same lithium precipitation type, the total lithium precipitation area, and the maximum lithium precipitation area corresponding to the same lithium precipitation type, so that the severity of the lithium precipitation of the anode sheet region corresponding to the photographed image can be known, and the battery can be traced based on the severity of the lithium precipitation to improve the performance of the battery.

[0145] In one embodiment, the detection device is used to splice the photographed images of the anode sheet obtained at each station to obtain a spliced image, and determine the number of winding turns of the photographed image with the lithium precipitation region in the battery based on the quotient value obtained by dividing the position coordinates of the photographed image with the lithium precipitation region in the spliced image by the total length of the anode sheet.

[0146] In the case that the quotient value is an integer, the quotient value is determined as the number of winding turns; in the case that the quotient value is not an integer, the quotient value is rounded up to obtain a rounding result, and the rounding result is determined as the number of winding turns. Alternatively, in the case that the quotient value is not an integer, the quotient value is rounded down to obtain a rounding result, and the rounding result is determined as the number of winding turns. Alternatively, in the case that the quotient value is not an integer, the quotient value is rounded down to obtain a first rounding result, and the quotient value is rounded up to obtain a second rounding result, and the first rounding result and the second rounding result are determined as the number of winding turns.

[0147] In this embodiment, the detection device splices the photographed images of the anode pole piece obtained at each station to obtain a spliced image, determines the number of winding turns of the photographed image with the lithium precipitation area in the spliced image based on the quotient value obtained by dividing the position coordinates of the photographed image with the lithium precipitation area by the total length of the anode pole piece, and facilitates subsequent rapid tracing of the position of the lithium precipitation area in the spliced image based on the number of winding turns.

[0148] All the photographed images of the target object and the detection results corresponding to the photographed images can be saved to form a complete quality tracing system, and data support is provided for subsequent quality analysis, process improvement, and optimization of the detection model. The detection results can include the number of winding turns, the lithium precipitation level of the anode pole piece region corresponding to the photographed image, and the lithium precipitation type of the lithium precipitation area. All the photographed images of the target object corresponding to the battery cell and the detection results corresponding to the photographed images can be stored in a file corresponding to the battery cell identification code of the battery cell. The battery cell identification code can be obtained by scanning the identification code on the battery cell by a code scanning device.

[0149] In one embodiment, as shown in Figure 7 Figure 7 is a flow diagram of a detection method provided by an embodiment of the present application. The detection method is applied to a detection device in a detection system and includes the following steps:

[0150] S701, receiving a photographed image of a target object sent by a photographing device in a detection system; the photographed image is an image obtained by the photographing device photographing the target object at a current station, and the target object includes an anode pole piece obtained by disassembling a battery cell.

[0151] S702, determining a lithium precipitation type of a lithium precipitation area on the anode pole piece according to the photographed image; the lithium precipitation type includes at least one of a strip-shaped lithium precipitation, a line-shaped lithium precipitation, a bubble-shaped lithium precipitation, and a point-shaped lithium precipitation.

[0152] S703, in the case that the photographing is completed by the photographing device at the current station, sending a photographing completion signal to a controller in the detection system; the photographing completion signal is used to instruct the controller to send a control instruction to a driving device in the detection system, and the control instruction is used to instruct the driving device to drive the photographing device to move a preset distance along a first direction of the anode pole piece and then reach a next station of the current station, so as to photograph the anode pole piece at the next station to obtain a next photographed image.

[0153] S704, receiving the next photographed image sent by the photographing device.

[0154] In one embodiment, S702, determining the lithium precipitation type of the lithium precipitation area on the anode pole piece according to the photographed image can be implemented in the following manner:

[0155] ​Based on the photographed image of the anode pole piece and the detection model, the type of lithium precipitation on the anode pole piece is determined.

[0156] In one embodiment, the detection method further comprises:

[0157] An image sample of an anode pole piece sample obtained after disassembly of a battery cell sample and an actual lithium precipitation type sample corresponding to the image sample are obtained, and an initial detection model is trained based on the image sample and the actual lithium precipitation type sample to obtain a detection model. The actual lithium precipitation type sample includes at least one of a strip-shaped lithium precipitation sample, a line-shaped lithium precipitation sample, a bubble-shaped lithium precipitation sample, and a point-shaped lithium precipitation sample.

[0158] In one embodiment, S702, according to the photographed image, the type of lithium precipitation in the lithium precipitation area of the anode pole piece can be determined by the following method:

[0159] The photographed image of the anode pole piece is preprocessed to obtain a target image; the lithium precipitation area in the target image is determined; and in the case that the lithium precipitation area meets the preset condition corresponding to the preset lithium precipitation type, the lithium precipitation type of the lithium precipitation area is determined as the preset lithium precipitation type.

[0160] At least one of the denoising processing, the grayscale processing, and the grayscale enhancement processing can be performed on the photographed image to obtain the target image.

[0161] For example, the photographed image can be denoised by using a Gaussian filter to obtain a denoised image, the denoised image can be grayscale processed to obtain a grayscale image, and the grayscale image can be grayscale enhanced to obtain an enhanced image, and the enhanced image is determined as the target image.

[0162] The Canny edge detection method or the Otsu threshold segmentation method can be used to identify the lithium precipitation area in the target image, and in the case that the lithium precipitation area meets the preset condition corresponding to the preset lithium precipitation type, the lithium precipitation type of the lithium precipitation area is determined as the preset lithium precipitation type.

[0163] In one embodiment, the detection method further comprises:

[0164] The lithium precipitation area of each lithium precipitation area is determined, the total lithium precipitation area is determined according to the lithium precipitation area of each lithium precipitation area corresponding to the same lithium precipitation type, and the lithium precipitation grade of the anode pole piece is determined according to the total number of each lithium precipitation area corresponding to the same lithium precipitation type, the total lithium precipitation area, and the maximum lithium precipitation area corresponding to the same lithium precipitation type.

[0165] In one embodiment, the method can further comprise the following steps:

[0166] The shooting images of the anode pole piece obtained at each station are spliced to obtain a spliced image. A quotient obtained by dividing the position coordinate of the shooting image with the lithium precipitation area in the spliced image by the total length of the anode pole piece is used to determine the winding turns of the shooting image with the lithium precipitation area in the battery cell.

[0167] In one embodiment, the quotient obtained by dividing the position coordinate of the shooting image with the lithium precipitation area in the spliced image by the total length of the anode pole piece is used to determine the winding turns of the shooting image with the lithium precipitation area in the battery cell in the following manner:

[0168] In the case where the quotient is an integer, the quotient is determined as the winding turns; in the case where the quotient is not an integer, the quotient is rounded up to obtain a rounding result, and the rounding result is determined as the winding turns.

[0169] In one embodiment, a detection method is also provided, which includes the following steps:

[0170] The detection device receives a reset completion signal of the shooting device; the code scanning device can scan the identification code on the battery cell to obtain the battery cell identification code and send the battery cell identification code to the detection device; the PLC confirms that the target object has reached the designated shooting position, the zoom lens is automatically zoomed, and in the case where the automatic zooming is completed, the PLC controls the shooting device to shoot the target object at the current station to obtain a shooting image and send the shooting image to the detection device. The detection device is configured to determine the lithium precipitation type of the lithium precipitation area on the anode pole piece according to the shooting image of the anode pole piece, and store the shooting image of the target object and the lithium precipitation type of the lithium precipitation area on the anode pole piece in a file corresponding to the battery cell identification code.

[0171] In the case where the anode pole piece is the target object, after the shooting device completes shooting at the current station, the shooting device can send the shooting image to the detection device, the detection device determines that the shooting device completes shooting according to the received shooting image, and sends a shooting completion signal to the controller, and the controller determines that the shooting device completes shooting at the current station according to the shooting completion signal. The controller sends a control instruction to the driving device in the case where the shooting device completes shooting at the current station; the driving device drives the shooting device to move a preset distance along the first direction of the anode pole piece and then reaches the next station in response to the control instruction; and the shooting device shoots the anode pole piece at the next station to obtain a next shooting image.

[0172] During the shooting process of the shooting device at the current station, the detection device can detect the shooting image obtained by the shooting device at the previous station of the current station to determine the lithium precipitation type of the lithium precipitation area in the shooting image obtained at the previous station. The shooting and detection are implemented synchronously, thereby improving the detection efficiency.

[0173] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of the steps or stages is not necessarily sequential, but can be alternately or alternately executed with at least part of other steps or steps or stages in other steps.

[0174] Based on the same inventive concept, the embodiments of the present application also provide a detection device for implementing the above-mentioned detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more detection device embodiments provided below can refer to the limitations of the detection method in the above text, which will not be repeated here.

[0175] In one embodiment, as shown in Figure 8 Figure 8 is a structural schematic diagram of a detection device provided by the embodiments of the present application. The detection device 800 is arranged in a detection equipment in a detection system, and the detection device 800 comprises:

[0176] The receiving module 801 is configured to receive a shooting image of a target object sent by a shooting device in a detection system. The shooting image is an image obtained by the shooting device shooting the target object at a current station, and the target object includes an anode sheet obtained after the battery cell is disassembled.

[0177] The first determination module 802 is configured to determine a lithium precipitation type of a lithium precipitation area on the anode sheet according to the shooting image. The lithium precipitation type includes at least one of a strip-shaped lithium precipitation, a line-shaped lithium precipitation, a bubble-shaped lithium precipitation, and a point-shaped lithium precipitation.

[0178] The sending module 803 is configured to send a shooting completion signal to a controller in the detection system in a case that the shooting by the shooting device at the current station is completed. The shooting completion signal is used to instruct the controller to send a control instruction to a driving device in the detection system. The control instruction is used to instruct the driving device to drive the shooting device to move a preset distance along a first direction of the anode sheet and then reach a next station of the current station, so as to obtain a next shooting image by shooting the anode sheet at the next station.

[0179] The receiving module 801 is further configured to receive the next shooting image sent by the shooting device.

[0180] ​In an embodiment, the first determination module 802 is specifically configured to determine the lithium precipitation type on the anode pole piece based on the photographed image of the anode pole piece and the detection model.

[0181] In an embodiment, the detection device 800 can further include:

[0182] The acquisition module is configured to acquire an image sample of an anode pole piece sample obtained after disassembly of a battery cell sample, and an actual lithium precipitation type sample corresponding to the image sample.

[0183] The training module is configured to train the initial detection model based on the image sample and the actual lithium precipitation type sample to obtain the detection model; the actual lithium precipitation type sample includes at least one of a bar-shaped lithium precipitation sample, a line-shaped lithium precipitation sample, a bubble-shaped lithium precipitation sample, and a point-shaped lithium precipitation sample.

[0184] In an embodiment, the first determination module 802 is specifically configured to pre-process the photographed image of the anode pole piece to obtain a target image; determine a lithium precipitation area in the target image; and in a case where the lithium precipitation area meets a preset condition corresponding to a preset lithium precipitation type, determine that the lithium precipitation type of the lithium precipitation area is the preset lithium precipitation type.

[0185] In an embodiment, the detection device 800 can further include:

[0186] The second determination module is configured to determine lithium precipitation areas of each lithium precipitation area, determine a total lithium precipitation area according to the lithium precipitation areas of the same lithium precipitation type, and determine a lithium precipitation grade of the anode pole piece according to the total number of the lithium precipitation areas corresponding to the same lithium precipitation type, the total lithium precipitation area, and the maximum lithium precipitation area corresponding to the same lithium precipitation type.

[0187] In an embodiment, the detection device 800 can further include:

[0188] The splicing module is configured to splice the photographed images of the anode pole pieces obtained at each station to obtain a spliced image.

[0189] The third determination module is configured to determine the number of winding turns of the photographed image with the lithium precipitation area in the battery cell based on a quotient value obtained by dividing the position coordinates of the photographed image with the lithium precipitation area in the spliced image by the total length of the anode pole piece.

[0190] In an embodiment, the third determination module is specifically configured to, in a case where the quotient value is an integer, determine the quotient value as the number of winding turns; and in a case where the quotient value is not an integer, perform upward rounding on the quotient value to obtain a rounding result, and determine the rounding result as the number of winding turns.

[0191] The various modules in the detection device described above can be implemented in whole or in part by software, hardware, and combinations thereof. The various modules described above can be embedded in the processor in the computer device in hardware form or independent of the processor in the computer device, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the various modules.

[0192] In one embodiment, a detection device is provided, which can be a terminal, and its internal structure diagram can be as shown in Figure 9 The detection device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. The processor of the detection device is configured to provide computing and control capabilities. The memory of the detection device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The communication interface of the detection device is configured to perform wired or wireless communication with an external terminal. The wireless communication can be achieved through WIFI, mobile cellular network, NFC (Near Field Communication), or other technologies. The computer program is executed by the processor to implement a detection method. The display screen of the detection device can be a liquid crystal display screen or an electronic ink display screen. The input device of the detection device can be a touch layer overlaid on the display screen, or a key, trackball, or touchpad arranged on the shell of the detection device, or an external keyboard, touchpad, or mouse, etc.

[0193] Those skilled in the art can understand that Figure 9 The structure shown in the above embodiment is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the detection device to which the scheme of the present application is applied. The specific detection device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0194] In one embodiment, a detection device is provided, which includes a memory and a processor. The memory stores a computer program. The processor executes the computer program to implement the steps of any of the method embodiments described above. The technical principles and effects are similar, and will not be repeated here.

[0195] In one embodiment, a computer-readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the steps of any of the method embodiments described above. The technical principles and effects are similar, and will not be repeated here.

[0196] In one embodiment, a computer program product is provided, which includes a computer program. The computer program is executed by a processor to implement the steps of any of the method embodiments described above. The technical principles and effects are similar, and will not be repeated here.

[0197] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties.

[0198] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments of each method. In the embodiments provided in the present application, any reference to a memory, a database or other medium can include at least one of a non-volatile and a volatile memory. The non-volatile memory can include a read-only memory (ROM), a magnetic tape, a floppy disk, a flash memory, an optical storage, a high-density embedded non-volatile memory, a resistive memory (ReRAM), a magnetoresistive random access memory (MRAM), a ferroelectric memory (FRAM), a phase change memory (PCM), a graphene memory, etc. The volatile memory can include a random access memory (RAM) or an external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as a static random access memory (SRAM) or a dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0199] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0200] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A detection system, characterized in that, The detection system includes: A photographing device is used to photograph a target object at the current workstation to obtain a photographed image, and to send the photographed image to a detection device; the target object includes the anode plate obtained after disassembling a battery cell; The detection device is used to determine the lithium plating type of the lithium plating region on the anode electrode based on the captured image; the lithium plating type includes at least one of strip-shaped lithium plating, linear lithium plating, bubble-shaped lithium plating, and dot-shaped lithium plating. The detection system also includes: The controller is used to send control commands to the drive device when the shooting device completes shooting at the current workstation; The driving device is used to respond to the control command and drive the imaging device to move a preset distance along the first direction of the anode plate to the next working position; the length of the anode plate in the first direction is greater than the length of the anode plate in the second direction. The imaging device is also used to capture the anode sheet at the next working position to obtain the next captured image.

2. The detection system according to claim 1, characterized in that, The detection system further includes a frame, and the driving device includes: The transmission mechanism includes a first mating component and a second mating component that engage in meshing transmission. The first mating component is mounted on the frame and extends along the first direction. A driving component is slidably fitted to the frame along the first direction. The shooting device is mounted on the driving component. The driving component is connected to the second fitting component and is used to drive the second fitting component to rotate, so that the driving component and the second fitting component move along the first direction.

3. The detection system according to claim 2, characterized in that, The imaging device includes: A light source assembly, connected to the driving component, is used to provide illumination for the shooting environment in which the shooting device is located; A camera assembly connected to the drive unit for taking pictures of the target object when the light source assembly provides illumination; the target object also includes at least one of the surfaces of the battery cell, the surfaces of the bare battery cell obtained after peeling off the outer casing of the battery cell, and the cathode electrode and the separator obtained after disassembling the battery cell.

4. The detection system according to claim 3, characterized in that, The camera assembly includes: A ranging sensor, connected to the zoom lens of the camera assembly, is used to measure the distance between the zoom lens and the target object; The zoom lens is used to adjust the focusing position of the zoom lens on the target object according to the distance; An indicator light is used to form a light spot on the target object; the light spot is used to indicate the focus position of the zoom lens.

5. The detection system according to claim 3 or 4, characterized in that, The light source assembly includes: An outer cover, which is connected to the drive unit, forms a cavity for accommodating the light source body; The light source body is connected to the light source controller located outside the cavity via a cable assembly that passes through a through hole provided on the outer cover. The cable assembly includes a cable and a cable entry assembly, the cable entry assembly being used to clamp the cable and seal the gap at the through hole.

6. The detection system according to any one of claims 1-4, characterized in that, The detection equipment is used to determine the type of lithium plating on the anode electrode based on the captured images and detection models.

7. The detection system according to claim 6, characterized in that, The detection device is used to acquire image samples of anode electrode samples obtained after disassembling the battery cell sample, and actual lithium plating type samples corresponding to the image samples. Based on the image samples and the actual lithium plating type samples, an initial detection model is trained to obtain the detection model. The actual lithium plating type samples include at least one of strip-shaped lithium plating samples, linear lithium plating samples, bubble-shaped lithium plating samples, and dot-shaped lithium plating samples.

8. The detection system according to claim 7, characterized in that, The detection device is used to input the image sample into the initial detection model, obtain the predicted lithium plating type output by the initial detection model, determine the difference between the predicted lithium plating type and the actual lithium plating type sample, and train the initial detection model based on the difference to obtain the detection model.

9. The detection system according to any one of claims 1-3, characterized in that, The detection device is used to determine the lithium plating area of ​​each of the lithium plating regions, and to determine the total lithium plating area based on the lithium plating area of ​​each lithium plating region corresponding to the same lithium plating type; and to determine the lithium plating level of the anode electrode region corresponding to the captured image based on the total number of lithium plating regions corresponding to the same lithium plating type, the total lithium plating area, and the maximum lithium plating area among the lithium plating areas corresponding to the same lithium plating type.

10. The detection system according to claim 2 or 3, characterized in that, The detection equipment is used to stitch together the images of the anode sheet acquired at each workstation to obtain a stitched image. Based on the quotient obtained by dividing the position coordinates of the image with lithium plating in the stitched image by the total length of the anode sheet, the number of turns of the image with lithium plating in the cell is determined.

11. A detection method, characterized in that, The detection method is applied to the detection equipment in the detection system, and the detection method includes: Receive the captured image of the target object sent by the imaging device in the detection system; the captured image is the image obtained by the imaging device at the current workstation of the target object, and the target object includes the anode plate obtained after disassembling the battery cell; Based on the captured images, the lithium plating type of the lithium plating region on the anode electrode is determined; the lithium plating type includes at least one of strip-shaped lithium plating, linear lithium plating, bubble-shaped lithium plating, and dot-shaped lithium plating. The method further includes: When the imaging device completes imaging at the current workstation, it sends an imaging completion signal to the controller in the detection system. The imaging completion signal is used to instruct the controller to send a control command to the drive device in the detection system. The control command is used to instruct the drive device to control the imaging device to move a preset distance along the first direction of the anode sheet and then reach the next workstation of the current workstation, where the anode sheet is imaged at the next workstation to obtain the next image. Receive the next captured image sent by the shooting device.

12. The detection method according to claim 11, characterized in that, Determining the lithium plating type in the lithium plating region on the anode electrode based on the captured image includes: Based on the captured images and detection model of the anode electrode, the type of lithium plating on the anode electrode is determined.

13. The detection method according to claim 12, characterized in that, The detection method further includes: Obtain image samples of anode electrode samples obtained after disassembling battery cell samples, and the actual lithium plating type samples corresponding to the image samples; Based on the image samples and the actual lithium plating type samples, an initial detection model is trained to obtain the detection model; the actual lithium plating type samples include at least one of strip-shaped lithium plating samples, linear lithium plating samples, bubble-shaped lithium plating samples, and dot-shaped lithium plating samples.

14. The detection method according to claim 11, characterized in that, Determining the lithium plating type in the lithium plating region on the anode electrode based on the captured image includes: The target image is obtained by preprocessing the captured image of the anode electrode. Identify the lithium plating region in the target image; If the lithium plating region meets the preset conditions corresponding to the preset lithium plating type, the lithium plating type of the lithium plating region is determined to be the preset lithium plating type.

15. The detection method according to claim 11, characterized in that, The detection method further includes: Determine the lithium plating area of ​​each lithium plating region, and determine the total lithium plating area based on the lithium plating area of ​​each lithium plating region corresponding to the same lithium plating type; The lithium plating grade of the anode electrode is determined based on the total number of lithium plating regions corresponding to the same lithium plating type, the total lithium plating area, and the largest lithium plating area among the lithium plating areas corresponding to the same lithium plating type.

16. The detection method according to claim 11, characterized in that, The detection method further includes: The images of the anode plates captured at each workstation are stitched together to obtain a stitched image; The number of turns of the image with lithium plating in the cell is determined by dividing the position coordinates of the image in the stitched image by the total length of the anode sheet.

17. The detection method according to claim 16, characterized in that, The determination of the number of turns of the image with lithium plating in the cell based on the quotient obtained by dividing the position coordinates of the image with lithium plating in the stitched image by the total length of the anode sheet includes: If the quotient is an integer, the quotient is determined to be the number of winding turns; If the quotient is not an integer, the quotient is rounded up to obtain the rounded result, and the rounded result is determined to be the number of winding turns.

18. A detection device, characterized in that, The detection device is installed in the detection equipment of the detection system, and the detection device includes: The receiving module is used to receive the captured image of the target object sent by the imaging device in the detection system; the captured image is the image obtained by the imaging device at the current workstation of the target object, and the target object includes the anode plate obtained after disassembling the battery cell; The first determining module is used to determine the lithium plating type of the lithium plating region on the anode electrode based on the captured image; the lithium plating type includes at least one of strip-shaped lithium plating, linear lithium plating, bubble-shaped lithium plating, and dot-shaped lithium plating. The sending module is used to send a shooting completion signal to the controller in the detection system when the shooting device completes shooting at the current station; the shooting completion signal is used to instruct the controller to send a control command to the drive device in the detection system, the control command is used to instruct the drive device to drive the shooting device to move a preset distance along the first direction of the anode sheet to the next station of the current station, and to shoot the anode sheet at the next station to obtain the next image. The receiving module is also used to receive the next captured image sent by the shooting device.

19. A detection device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 11 to 17.

20. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 11 to 17.

21. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 11 to 17.

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