CN117686432B

CN117686432B - Battery welding detection system and method

Info

Publication number: CN117686432B
Application number: CN202410137228.9A
Authority: CN
Inventors: 申子阳; 姜平; 祁磊; 卢高风
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-01-31
Filing date: 2024-01-31
Publication date: 2024-06-07
Anticipated expiration: 2044-01-31
Also published as: CN117686432A

Abstract

The application discloses a battery welding detection system and a method, wherein the battery welding detection system comprises: the system comprises an upper computer, a lower computer and an imaging assembly, wherein the imaging assembly comprises a first acquisition unit and a second acquisition unit; a first acquisition unit including two first cameras opposing in a first direction; the upper computer is used for acquiring image data, wherein the image data comprises a first image corresponding to each first wall and a second image corresponding to each second wall of the battery cell; and the detection result comprises that the surface of the battery monomer is defective or the surface of the battery monomer is not defective. According to the embodiment of the application, the defects on the battery cells can be effectively detected.

Description

Battery welding detection system and method

Technical Field

The application belongs to the field of process detection, and particularly relates to a battery welding detection system and method.

Background

With the development of new energy technology, the battery is increasingly widely applied, for example, to mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like.

In the preparation process of the battery monomer, the battery monomer needs to undergo a plurality of preparation processes, and particularly after the welding process, the surface of the battery monomer is easy to generate defects such as welding slag, pits, dirt and the like, so that the product quality of the battery monomer can be seriously affected. Before repairing the defects on the battery cells, the defects need to be accurately detected and identified, so how to effectively detect the defects on the battery cells is a problem to be solved in the battery technology.

Disclosure of Invention

The embodiment of the application provides a battery welding detection system and a battery welding detection method, which can effectively detect defects on battery monomers.

In a first aspect, an embodiment of the present application provides a battery welding detection system, including: the system comprises an upper computer, a lower computer and an imaging assembly, wherein the imaging assembly comprises a first acquisition unit and a second acquisition unit;

The first acquisition unit comprises two first cameras which are opposite along a first direction, and the two first cameras are respectively used for shooting two first walls of the battery cell which are opposite along the first direction in response to a first control signal of the lower computer and generating a first image of each first wall;

the second acquisition unit comprises two second cameras which are opposite along a second direction, the two second cameras are respectively used for responding to second control signals of the lower computer to shoot two second walls of the battery cell which are opposite along the second direction, and a second image of each second wall is generated, and the first direction is intersected with the second direction;

the upper computer is used for acquiring image data, wherein the image data comprises a first image corresponding to each first wall and a second image corresponding to each second wall of the battery cell;

The upper computer is further used for respectively identifying the first image and the second image to obtain a detection result of the surface of the battery monomer, wherein the detection result comprises that the surface of the battery monomer has defects or the surface of the battery monomer has no defects. In the embodiment of the application, two first cameras opposite along the first direction and two second cameras opposite along the second direction are provided, so that after a battery monomer enters the shooting range of an acquisition unit, the first cameras and the second cameras can respectively shoot the side wall of the battery, thereby facilitating the integral image data of the side wall, effectively detecting the defects on the battery monomer, and in addition, the first cameras and the second cameras can simultaneously execute shooting tasks, thereby being beneficial to saving shooting time and meeting the production speed of a production line.

In some embodiments of the first aspect, the battery cell includes an end cap and a housing, the end cap is welded to the housing, and the first wall and the second wall are both located on the housing;

The first camera is used for shooting a first area on the first wall, and part of the edge of the first area coincides with a first welding line between the end cover and the first wall;

the second camera is used for shooting a second area on the second wall, and part of the edge of the second area coincides with a second welding line between the end cover and the second wall.

Based on the above, the battery welding detection system can more specifically shoot and detect the region with higher occurrence probability of the defect on the battery cell, and under the condition that the defect on the battery cell is effectively detected, the shooting and detection efficiency can be further improved.

In some embodiments of the first aspect, the first camera comprises a first sub-camera and a second sub-camera, the first sub-camera and the second sub-camera being arranged along a second direction;

The first sub-camera is used for shooting a first part of the first wall, the second sub-camera is used for shooting a second part of the first wall, and the first part is connected with the second part and is distributed along a second direction.

Based on the above, the above technical solution divides the first wall into the first portion and the second portion along the second direction, and sets the first camera to include the first sub-camera and the second sub-camera to respectively shoot the first portion and the second portion, thereby improving the overall shooting precision of the first camera, and being beneficial to improving the reliability of the battery welding detection system.

In some embodiments of the first aspect, the imaging assembly further includes a light emitting unit, where the light emitting unit is disposed in one-to-one correspondence with each target camera in the imaging assembly, and the target cameras included in the imaging assembly are a first sub-camera, a second sub-camera, and a second camera, respectively;

each light emitting unit comprises a plurality of light areas, and the plurality of light areas of each light emitting unit are arranged around the corresponding target camera of the light emitting unit;

the light areas included in each light emitting unit sequentially emit light based on a preset light emitting sequence;

The object camera is for performing photographing while each light zone in the light emitting unit emits light corresponding to each light emitting unit.

According to the embodiment of the application, based on the light-emitting unit, light rays in different directions are provided to irradiate the surface of the battery cell, different defect types can respectively show different image characteristics in the image, whether the surface of the battery cell has defects or not can be conveniently detected, and the accuracy of defect detection can be effectively improved.

In some embodiments of the first aspect, one of the two first sub-cameras and the two second cameras is disposed at the first acquisition station and the other of the two second sub-cameras and the two second cameras is disposed at the second acquisition station;

the first collecting station and the second collecting station are arranged along the second direction.

Based on this, through setting up first collection station and second collection station to carry out the order shooting to the battery monomer, can reduce the interference each other when a plurality of cameras shoot simultaneously, be favorable to improving battery welding detecting system's shooting quality.

In some embodiments of the first aspect, the first acquisition unit further comprises a first driving component, the first driving component being connected to the first camera, the first driving component being capable of driving the first camera to move in the second direction;

The second acquisition unit further comprises a second driving component, the second driving component is connected to the second camera, and the second driving component can drive the second camera to move along the first direction.

Based on this, by providing the first driving member and the second driving member, on the one hand, the visual field performance of the first camera in the second direction can be made not limited by the dimension of the first wall in the second direction, thereby increasing the selectable range of the first camera, and the visual field performance of the second camera in the first direction can be made not limited by the dimension of the second wall in the first direction, thereby increasing the selectable range of the second camera, thereby effectively increasing the configuration flexibility of the battery welding detection system; on the other hand, the first camera can shoot the first wall at different points in the second direction relative to the first wall, and the second camera can shoot the second wall at different points in the first direction relative to the second wall, so that the shooting precision of the battery welding detection system can be effectively improved; on the other hand, the position of the first camera in the second direction can be flexibly adjusted according to different battery monomers, and the position of the second camera in the first direction can be flexibly adjusted, so that the applicability of the battery welding detection system can be effectively improved.

In some embodiments of the first aspect, the first acquisition unit further includes a third driving component, the third driving component is connected between the first driving component and the first camera, the third driving component can drive the first camera to move along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other;

the second acquisition unit further comprises a fourth driving component, the fourth driving component is connected between the second driving component and the second camera, and the fourth driving component can drive the second camera to move along a third direction.

Based on this, the above technical solution, by providing the third driving component and the fourth driving component, on one hand, can make the view performance of the first camera along the third direction not limited by the dimension of the first wall along the third direction, thereby improving the selectable range of the first camera, and can make the view performance of the second camera along the third direction not limited by the dimension of the second wall along the third direction, thereby improving the selectable range of the second camera, and further improving the configuration flexibility of the battery welding detection system; on the other hand, the first camera can shoot the first wall at different points in the third direction relative to the first wall, and the second camera can shoot the second wall at different points in the third direction relative to the second wall, so that the shooting precision of the battery welding detection system can be further improved; in still another aspect, the position of the first camera in the third direction can be flexibly adjusted for different battery monomers, and the position of the second camera in the third direction can be flexibly adjusted, so that the applicability of the battery welding detection system can be further improved.

In a second aspect, the present application provides a battery welding detection method, including:

Under the condition that a battery cell is located in a battery welding detection system, a first control signal is sent to a first acquisition unit through a lower computer, and a second control signal is sent to a second acquisition unit through the lower computer, wherein two first cameras in the first acquisition unit are respectively used for shooting two first walls of the battery cell, which are opposite in a first direction, in response to the first control signal, and generating a first image of each first wall, the two first cameras are opposite in the first direction, and two second cameras in the second acquisition unit are respectively used for shooting two second walls of the battery cell, which are opposite in a second direction, in response to the second control signal, and generating a second image of each second wall, the two second cameras are opposite in the second direction, and the first direction intersects with the second direction;

Acquiring image data of the surface of a battery cell through an upper computer, wherein the image data comprises a first image of each first wall and a second image of each second wall of the battery cell;

The first image and the second image are respectively identified through an upper computer, so that a detection result of the surface of the battery cell is obtained, wherein the detection result comprises that the surface of the battery cell has defects or the surface of the battery cell has no defects;

Each first camera comprises a first sub-camera and a second sub-camera, the first sub-cameras and the second sub-cameras are arranged along the second direction, one of the two first sub-cameras and the two second cameras is arranged at a first acquisition station, the other of the two second sub-cameras and the two second cameras is arranged at a second acquisition station, and the first acquisition station and the second acquisition station are arranged along the second direction;

the method for acquiring the image data of the surface of the battery monomer through the upper computer comprises the following steps:

Under the condition that the battery monomers are located at a first collecting station, corresponding to a first part of each first wall, controlling the first sub-camera to move to each first preset position through a lower computer, and shooting to obtain a first sub-image corresponding to the first part;

The second camera in the first acquisition station is controlled to move to each second preset position through the lower computer, and second sub-images corresponding to the second wall are shot and obtained, wherein the number of the first preset positions is at least one, and the number of the second preset positions is at least one;

The lower computer controls the battery monomer to move to the second collecting station, and under the condition that the battery monomer is positioned at the second collecting station, the second sub-camera is controlled by the lower computer to move to a third preset position corresponding to the second part of each first wall, and a third sub-image corresponding to the second part is obtained through shooting; the second camera in the second acquisition station is controlled to move to a fourth preset position through a lower computer, and a fourth sub-image corresponding to the second wall is obtained through shooting, wherein the number of the third preset positions is at least one, and the number of the fourth preset positions is at least one;

The first sub-image and the third sub-image are spliced through the upper computer corresponding to each first wall, and the first image corresponding to each first wall is obtained;

And splicing the second sub-images and the fourth sub-images through the upper computer corresponding to each second wall to obtain the second image corresponding to each second wall.

Based on the method, the image acquisition is carried out on the surface of the battery monomer after the welding procedure, the obtained image of the surface of the battery monomer is high in definition and obvious in characteristics, and then the image is identified, so that the detection result can be obtained rapidly, and the accuracy of the detection result can be improved effectively.

In some embodiments of the second aspect, in the case where there is a defect on the surface of the battery cell, the detection result further includes: defect categories of defects, the defect categories including: raised defects, recessed defects, or smudge defects.

Based on the above, in the imaging process, different defect types can respectively present different image features in the image, so that the different image features can be used as the basis of whether defects exist on the surface of the battery monomer, and the accuracy of defect detection can be effectively improved.

In some embodiments of the second aspect, the first image and the second image are respectively displayed by the upper computer

The second image is identified to obtain a detection result of the surface of the battery monomer, which comprises the following steps:

acquiring an image corresponding to a first target area from the first image through an upper computer to obtain a first image to be tested, wherein the first target area is an area, close to a first welding line, on the first wall; and

Acquiring an image corresponding to a second target area from the second image through an upper computer to obtain a second image to be detected, wherein the second target area is an area, close to a second welding seam, on the second wall;

And generating a detection result of the surface of the battery monomer by the upper computer according to the first image to be detected and the second image to be detected.

According to the embodiment of the application, the first target area is extracted before the first image is identified, and the second target area is extracted before the second image is identified, so that the target area with higher probability of occurrence of the defects on the battery cells can be detected more specifically, and the shooting and detecting efficiency can be further improved under the condition that the defects on the battery cells are kept to be detected effectively.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

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 drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

Fig. 1 is a schematic structural diagram of a battery welding detection system and a battery cell according to some embodiments of the present application;

fig. 2 is a schematic perspective view of a first camera of a battery welding detection system according to some embodiments of the present application cooperating with a battery cell;

Fig. 3 is a schematic perspective view of a second camera of a battery welding detection system according to some embodiments of the present application cooperating with a battery cell;

Fig. 4 is a schematic perspective view of a battery cell according to some embodiments of the present application;

fig. 5 is a schematic structural diagram of a first camera of a battery welding detection system according to some embodiments of the present application;

FIG. 6 is a schematic diagram of a second camera of a battery welding detection system according to some embodiments of the present application;

Fig. 7 is a schematic structural diagram of another battery welding detection system according to some embodiments of the present application in cooperation with a battery cell;

Fig. 8 is a schematic perspective view of a battery cell according to some embodiments of the present application;

FIG. 9 is a schematic diagram of a first camera of a battery welding detection system according to some embodiments of the present application;

FIG. 10 is a schematic diagram of a second camera of a battery welding detection system according to some embodiments of the present application;

fig. 11 is a schematic flow chart of a battery welding detection method according to an embodiment of the present application;

FIG. 12 is a schematic view of a defect image according to an embodiment of the present application;

FIG. 13 is a second exemplary defect image feature diagram according to an embodiment of the present application;

FIG. 14 is a third exemplary defect image feature provided by an embodiment of the present application;

Fig. 15 is a schematic view of a light emitting unit according to an embodiment of the present application;

Fig. 16 is a schematic diagram of a preset position according to an embodiment of the present application.

Reference numerals in the specific embodiments are as follows:

100. A battery welding detection system; 10. a first acquisition unit; 20. a second acquisition unit; 200. a battery cell; 210. an end cap; 220. a housing; 221. a first wall;

2211. A first portion;

2212. A second portion; 222. a second wall; 230. a first region; 240. a second region; 250. a first weld; 260. a second weld;

110. A first acquisition station; 11. a first camera; 111. a first sub-camera; 112. a second sub-camera; 12. a first driving part; 13. a third driving part;

120. A second acquisition station; 21. a second camera; 22. a second driving part; 23. a fourth driving part; x, a first direction; y, second direction; z, third direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

The term "parallel" in the present application includes not only the case of absolute parallelism but also the case of substantially parallelism as is conventionally recognized in engineering; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering.

In the preparation process of the battery monomer, the battery monomer needs to undergo a plurality of preparation processes, and particularly after the welding process, the surface of the battery monomer is easy to generate defects such as welding slag, pits, dirt and the like, so that the product quality of the battery monomer can be seriously affected. Before repairing the defects on the battery cells, the defects need to be accurately detected and identified. Currently, a detection device is generally arranged to detect the quality of the battery cell, wherein a laser camera is generally arranged in the detection device to scan a welding line, and battery welding detection is carried out on a scanned image to realize the identification of the welding line defect. However, the laser camera for scanning the welding seam has a small detection field of view, a large visual blind area exists, and the whole battery cell is difficult to scan comprehensively, so that the residual welding slag on the battery cell is difficult to detect.

Based on the above, the present application provides a battery welding detection system, comprising: the system comprises an upper computer, a lower computer and an imaging assembly, wherein the imaging assembly comprises a first acquisition unit and a second acquisition unit;

the upper computer is further used for respectively identifying the first image and the second image to obtain a detection result of the surface of the battery monomer, wherein the detection result comprises that the surface of the battery monomer has defects or the surface of the battery monomer has no defects.

According to the technical scheme, the first acquisition unit can shoot two first walls of the battery monomer along the first direction, the second acquisition unit can shoot two second walls of the battery monomer along the second direction, so that comprehensive image data of the shell of the battery monomer can be obtained, and due to the fact that the image definition of the surface of the battery monomer is high and the characteristics are obvious, reliable image data support is provided for detecting defects on the battery monomer, and the defects on the battery monomer can be effectively detected. Based on the method, the upper computer can quickly obtain the detection result and effectively improve the accuracy of the detection result by identifying the image.

The battery welding detection system according to the embodiment of the present application will be described with reference to the accompanying drawings. Fig. 1 is a schematic structural diagram of a battery welding detection system according to some embodiments of the present application, fig. 2 is a schematic structural diagram of a first camera of the battery welding detection system according to some embodiments of the present application, and fig. 3 is a schematic structural diagram of a second camera of the battery welding detection system according to some embodiments of the present application.

As shown in fig. 1 to 3, an embodiment of the present application provides a battery welding detection system 100, where the battery welding detection system 100 includes an upper computer, a lower computer, and an imaging assembly, the imaging assembly including a first acquisition unit 10 and a second acquisition unit 20, the first acquisition unit 10 including two first cameras 11 opposing in a first direction X, the two first cameras 11 being respectively used to capture two first walls 221 of a battery cell 200 opposing in the first direction X in response to a first control signal of the lower computer, and generate a first image of each first wall. The second acquisition unit 20 includes two second cameras 21 opposite in a second direction Y, and the two second cameras 21 are respectively used for photographing two second walls 222 of the battery cell 200 opposite in the second direction Y in response to a second control signal of the lower computer and generating a second image of each second wall, and the first direction X intersects with the second direction Y.

Illustratively, the battery welding detection system 100 may further include a carrying platform for carrying the battery cell 200, the first acquisition unit 10, and the second acquisition unit 20. The bearing table is provided with a collecting station for bearing the battery cells 200 and a mounting station for mounting the first collecting unit 10 and the second collecting unit 20, and the mounting station is arranged around the collecting station.

Specifically, the first acquisition unit 10 and the second acquisition unit 20 are connected to a carrying table. The first acquisition unit 10 may be detachably connected to the carrying platform, or may be fixedly connected to the carrying platform, and the first acquisition unit 10 may be directly connected to the carrying platform, or may be limited to the carrying platform by other components. The second acquisition unit 20 may be detachably connected to the carrying platform, or may be fixedly connected to the carrying platform, and the second acquisition unit 20 may be directly connected to the carrying platform, or may be limited to the carrying platform by other components. As an example, the connection manner of the first collecting unit 10 and the carrying platform and the connection manner of the second collecting unit 20 and the carrying platform may be, but not limited to, bolting, welding, riveting, clamping, bonding, etc.

The two first cameras 11 in the first acquisition unit 10 are respectively located at two opposite sides of the battery cell 200 along the first direction X, and are respectively used for acquiring the photographed images of the two first walls 221 of the battery cell 200 opposite to each other along the first direction X, wherein the first direction X can be understood as the thickness direction of the battery cell. The two second cameras 21 in the second acquisition unit 20 are respectively located at two opposite sides of the battery cell 200 along the second direction Y, and are respectively used for acquiring the photographed images of the two second walls 222 of the battery cell 200 opposite along the second direction Y, where the second direction Y may be understood as the length direction of the battery cell. After the photographed images of the two first walls 221 and the photographed images of the two second walls 222 are acquired, the photographed images are processed and identified to determine whether a defect exists. Wherein the defect may be, but is not limited to, slag, dents, dirt, etc.

In one example, the two first cameras 11 and the two second cameras 21 can simultaneously photograph the battery cells such that the battery welding detection system 100 simultaneously acquires photographed images of the two first walls 221 and photographed images of the two second walls 222. Shooting time can be saved, and detection efficiency is improved.

In another example, the two first cameras 11 and the two second cameras 21 may photograph the battery cells in a sequence such that the battery welding detection system 100 acquires photographed images of the two first walls 221 and photographed images of the two second walls 222 in a sequence. That is, first, one of the two first cameras 11 acquires a captured image of one of the two first walls 221; then, the other of the two first cameras 11 acquires a captured image of the other of the two first walls 221; then, one of the two second cameras 21 acquires a captured image of one of the two second walls 222; finally, the other of the two second cameras 21 acquires the photographed image of the other of the two second walls 222, so that interference between the plurality of cameras when photographing at the same time can be reduced, which is beneficial to improving photographing quality.

The images obtained by photographing at the first and second collecting units 10 and 20, respectively, may be transmitted to the upper computer, and thus, the upper computer may obtain image data of the battery pack, that is, a first image corresponding to each first wall and a second image corresponding to each second wall of the battery cell.

After the upper computer obtains the image data, the first image and the second image can be respectively identified, and whether the surface of the battery monomer is defective or the surface of the battery monomer is not defective is judged, so that a detection result of the surface of the battery monomer is generated.

Optionally, the battery welding detection system 100 may further include a light source to provide sufficient light for photographing of the first and second acquisition units 10 and 20. As an example, the light source may be a multispectral light source.

It will be appreciated that during the preparation of the battery cell, the battery cell needs to undergo multiple preparation processes, and the surface area of the two first walls 221 and the two second walls 222 of the battery cell is larger, and the specific gravity of the whole battery cell is higher, so that the risk of defects on the two first walls 221 and the two second walls 222 of the battery cell is higher. Especially, after the welding process, the surface of the battery monomer is easy to generate welding slag, pits, dirt and other defects, so that the product quality of the battery monomer can be seriously affected.

In this way, the battery welding detection system 100 in the above technical solution can shoot two first walls 221 of the battery cell 200 opposite to each other along the first direction X and two second walls 222 of the battery cell 200 opposite to each other along the second direction Y, so as to obtain relatively comprehensive image data of the outer surface of the battery cell, provide reliable image data support for detecting defects on the battery cell, and effectively detect defects on the battery cell.

Fig. 4 is a schematic perspective view of a battery cell according to some embodiments of the present application, fig. 5 is a schematic structural view of a first camera of a battery welding detection system according to some embodiments of the present application, and fig. 6 is a schematic structural view of a second camera of a battery welding detection system according to some embodiments of the present application.

With continued reference to fig. 4-6, in some embodiments, the battery cell to be tested includes an end cap 210 and a housing 220, the end cap 210 being welded to the housing 220, and a first wall 221 and a second wall 222 both being located on the housing 220. The first camera 11 is used for photographing a first area 230 on the first wall 221, and a part of the edge of the first area 230 coincides with a first weld 250 between the end cap 210 and the first wall 221. The second camera 21 is used to capture a second area 240 on the second wall 222, and a portion of the edge of the second area 240 coincides with a second weld 260 between the end cap 210 and the second wall 222.

As a specific embodiment, the camera can be matched with different light rays in the imaging process, so that the definition of an image can be improved, and the accuracy of a detection result is improved. Alternatively, the light emitting unit and the camera may be an integrated device or a separate device, and the manner of providing the light is not particularly limited.

Illustratively, defects present on the cell surface include, but are not limited to, raised defects, recessed defects, or smudge defects, etc. In the imaging process, different defect types can respectively present different image features in the image, so that the different image features can be used as the basis of whether defects exist on the surface of the battery cell.

During the fabrication of the battery cell, after end cap 210 is welded to housing 220, a first weld 250 is formed between end cap 210 and first wall 221, and a second weld 260 is formed between end cap 210 and second wall 222. A portion of the rim of first region 230 coincides with first weld 250 between end cap 210 and first wall 221, i.e., first region 230 may be understood as a peripheral region of first weld 250; a portion of the edge of second region 240 coincides with second weld 260 between end cap 210 and second wall 222, i.e., second region 240 may be understood as a peripheral region of second weld 260. It will be appreciated that the peripheral regions of the first weld bead 250 and the peripheral regions of the second weld bead 260 are at a higher risk of creating defects such as slag, dishing, and dirt.

In this way, the first camera 11 in the above technical solution shoots the first area 230 on the first wall 221, and the second camera 21 shoots the second area 240 on the second wall 222, so that the battery welding detection system 100 can more specifically shoot and detect the area with higher probability of occurrence of the defect on the battery cell, and can further improve the shooting and detecting efficiency while maintaining effective detection of the defect on the battery cell.

In some embodiments, the first direction X may be understood as a thickness direction of the battery cell, the second direction Y may be understood as a length direction of the battery cell, and the third direction Z may be understood as a height direction of the battery cell, the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

The first distance L1 between the side edge of the first region 230 away from the first weld 250 in the third direction Z and the first weld 250 refers to the minimum distance between the side edge of the first region 230 away from the first weld 250 in the third direction Z and the first weld 250, and the first field of view b1 of the first camera 11 in the third direction Z refers to the size range that the first camera 11 can capture in the third direction Z.

The second distance L2 between the side edge of the second region 240, which is far from the second weld 260, and the second weld 260 in the third direction Z refers to the minimum distance between the side edge of the second region 240, which is far from the second weld 260, and the second weld 260 in the third direction Z, and the second field of view b2 of the second camera 21 in the third direction Z refers to the size range that the second camera 21 can capture in the third direction Z.

It will be appreciated that the greater the first distance L1 and the second distance L2, the greater the extent of the first region 230 and the second region 240, and thus the less the risk of missing a defect on a battery cell by the battery weld inspection system 100.

Thus, the above technical solution can improve the reliability of the battery welding detection system 100 by setting the first distance L1 and the second distance L2 to satisfy the above range, so that the shooting and detection efficiency is further improved under the condition that the battery welding detection system 100 keeps the risk of missing detection on the defects on the battery cell.

Fig. 7 is a schematic structural diagram of another battery welding detection system according to some embodiments of the present application, and fig. 8 is a schematic structural diagram of a battery according to some embodiments of the present application.

With continued reference to fig. 7-8, in some embodiments, the first camera includes a first sub-camera 111 and a second sub-camera 112, the first sub-camera 111 and the second sub-camera 112 being arranged along the second direction Y. The first sub-camera 111 is used for photographing a first portion 2211 of the first wall 221, and the second sub-camera 112 is used for photographing a second portion 2212 of the first wall 221, and the first portion 2211 is connected to the second portion 2212 and arranged along the second direction Y.

It will be appreciated that the larger the size of the battery cell 200, the larger the requirement for the visual field performance of the photographing camera, and the larger the visual field of the photographing camera, the lower the detection accuracy thereof.

As described above, the first direction X is the thickness direction of the battery cell, the second direction Y is the length direction of the battery cell, the first wall 221 is the long side wall of the battery cell, and the second wall 222 is the short side wall of the battery cell, so that the size of the first wall 221 in the second direction Y is larger, so that the field of view of the first camera 11 in the second direction Y needs to be larger, and the improvement of the field of view is accompanied by the reduction of the accuracy of the captured image of the first wall 221 acquired by the first camera 11.

As such, the above-mentioned technical solution is advantageous for improving the reliability of the battery welding detection system 100 by dividing the first wall 221 into the first portion 2211 and the second portion 2212 along the second direction Y and arranging the first camera 11 in a form including the first sub-camera 111 and the second sub-camera 112 to photograph the first portion 2211 and the second portion 2212, respectively, so that the overall photographing accuracy of the first camera 11 can be improved.

In some embodiments, the imaging assembly further comprises a light emitting unit, wherein the light emitting unit is arranged in one-to-one correspondence with each target camera in the imaging assembly, and the target cameras in the imaging assembly are a first sub-camera, a second sub-camera and a second camera respectively; each light emitting unit comprises a plurality of light areas, and the plurality of light areas of each light emitting unit are arranged around the corresponding target camera of the light emitting unit; the light areas included in each light emitting unit sequentially emit light based on a preset light emitting sequence; the object camera is for performing photographing while each light zone in the light emitting unit emits light corresponding to each light emitting unit.

In the imaging process of each target camera, the light-emitting units can provide light rays in different directions to the battery cells, so that the definition of images can be improved, and the accuracy of detection results can be improved.

Fig. 15 is a schematic diagram of a light emitting unit according to an embodiment of the present application, where the light emitting unit includes 8 light areas, each of which may be 45 °, and each of which may be configured with the same number of light beads and the same color.

The plurality of light zones may sequentially emit light based on a preset light emission sequence, alternatively, the preset light emission sequence may be clockwise, counterclockwise, or a part of the light zones may emit light first and then another part of the light zones, and the specific sequence is not limited at all.

For example, the plurality of light areas included in each light emitting unit are disposed around the target camera corresponding to the light emitting unit, based on which, in the case that the battery cell moves to the preset photographing position, light rays from different directions may be irradiated to the surface of the battery cell. For example, the preset lighting sequence is clockwise, and during shooting, the light zone 1 starts clockwise, and the light zone 8 to the light zone 2 sequentially light up.

The target camera performs shooting when each light area in the light emitting unit emits light, specifically, in the process of turning on and off each light area, the target camera can perform one or more times of image capturing, that is, after all light area light sources are turned on and off once, the target camera acquires a plurality of images, the target camera outputs images of different channels in a mixed mode according to exposure maps of different light areas, each channel presents different defect characteristics, optionally, the image presented by the channel with the most obvious selection characteristics can be used as a detection image according to the definition of each image, so that the reliability of a detection result is improved.

Alternatively, the light emitting unit and the target camera may be an integrated device or a separate device. For example, the integrated device may be a hybrid data camera, where one of the first sub-camera and the second sub-camera is a hybrid data camera, or the first sub-camera and the second sub-camera are both hybrid data cameras. The hybrid data camera may output various types of image data, such as a 2D image, a 2.5D image, or a 3D image, etc., through different imaging modes. Thereby enabling further improvement in the applicability and photographing accuracy of the battery welding detection system 100.

In some embodiments, one second camera 21 of the two first sub-cameras 111 and the two second cameras 21 is disposed at the first collecting station 110, the other second camera 21 of the two second sub-cameras 112 and the two second cameras 21 is disposed at the second collecting station 120, and the first collecting station 110 and the second collecting station 120 are arranged along the second direction Y.

In the process of shooting and detecting the battery cell 200, the battery cell 200 is first located on the first collecting station 110, the two first sub-cameras 111 respectively shoot the first portions 2211 of the two first walls 221 of the battery cell 200, and one of the two second cameras 21 shoots one of the two second walls 222 of the battery cell 200; the battery cell 200 is then positioned at the second acquisition station 120, and the two second sub-cameras 112 respectively capture the second portions 2212 of the two first walls 221 of the battery cell 200, and the other one of the two second cameras 21 captures the other one of the two second walls 222 of the battery cell 200.

Optionally, a conveying component may be disposed on the carrying platform, where the conveying component extends along the second direction Y, and the conveying component can convey the battery monomer 200 from the first collecting station 110 to the second collecting station 120, which is beneficial to improving the automation degree, so as to improve the shooting efficiency of the battery welding detection system 100. As an example, the conveying member may be a conveyor belt.

According to the technical scheme, the first collecting station 110 and the second collecting station 120 are arranged to photograph the battery cells 200 in a sequence, so that interference among a plurality of cameras in simultaneous photographing can be reduced, and the photographing quality of the battery welding detection system 100 can be improved.

Fig. 9 is a schematic structural view of a first camera of another battery welding detection system according to some embodiments of the present application, and fig. 10 is a schematic structural view of a second camera of another battery welding detection system according to some embodiments of the present application.

With continued reference to fig. 9-10, in some embodiments, the first acquisition unit 10 further includes a first drive component 12, the first drive component 12 being coupled to the first camera 11, the first drive component 12 being capable of driving the first camera 11 to move in the second direction Y. The second acquisition unit 20 further comprises a second driving member 22, the second driving member 22 being connected to the second camera 21, the second driving member 22 being capable of driving the second camera 21 to move in the first direction X.

Illustratively, during photographing of the first wall 221 by the first camera 11, the first driving part 12 can drive the first camera 11 to move in the second direction Y so that the first camera 11 photographs a plurality of points in the second direction Y. As an example, in the case where the field of view of the first camera 11 in the second direction Y is smaller than the size of the first wall 221 in the second direction Y, the first camera 11 is moved in the second direction Y by the driving of the first driving part 12, and different positions of the first wall 221 in the second direction Y can be photographed to acquire a complete photographed image of the first wall 221 in the second direction Y. As another example, in the case where the field of view of the first camera 11 in the second direction Y is greater than or equal to the size of the first wall 221 in the second direction Y, the first camera 11 is moved in the second direction Y by the driving of the first driving part 12, and the first wall 221 can be photographed at different points in the second direction Y with respect to the first wall 221 to improve photographing accuracy.

During the photographing of the second wall 222 by the second camera 21, the second driving part 22 can drive the second camera 21 to move in the first direction X so that the second camera 21 photographs a plurality of points in the first direction X. As an example, in the case where the field of view of the second camera 21 in the first direction X is smaller than the size of the second wall 222 in the first direction X, the second camera 21 is moved in the first direction X by the driving of the second driving part 22, and different positions of the second wall 222 in the first direction X can be photographed to acquire a complete photographed image of the second wall 222 in the first direction X. As another example, in the case where the field of view of the second camera 21 in the first direction X is greater than or equal to the size of the second wall 222 in the first direction X, the second camera 21 is moved in the first direction X by the second driving part 22, and the second wall 222 can be photographed at different points in the first direction X with respect to the second wall 222 to improve photographing accuracy.

Alternatively, the first and second driving parts 12 and 22 may include, but are not limited to, driving members including a driving motor, a driving cylinder, or a driving cylinder.

Alternatively, the first camera 11 may be detachably connected to the first driving part 12, or may be fixedly connected to the first driving part 12. The first camera 11 may be directly connected to the first driving part 12, or may be limited to the first driving part 12 by other parts. As an example, the first camera 11 and the first driving part 12 may be connected by, but not limited to, bolting, welding, riveting, clamping, bonding, or the like.

Alternatively, the second camera 21 may be detachably connected to the second driving part 22, or may be fixedly connected to the second driving part 22. The second camera 21 may be directly connected to the second driving part 22, or may be limited to the second driving part 22 by other parts. As an example, the second camera 21 and the second driving part 22 may be connected by, but not limited to, bolting, welding, riveting, clamping, bonding, or the like.

As such, by providing the first driving part 12 and the second driving part 22, on the one hand, the visual field performance of the first camera 11 along the second direction Y can be made not limited by the dimension of the first wall 221 along the second direction Y, so as to increase the selectable range of the first camera 11, and the visual field performance of the second camera 21 along the first direction X can be made not limited by the dimension of the second wall 222 along the first direction X, so as to increase the selectable range of the second camera 21, so as to effectively increase the configuration flexibility of the battery welding detection system 100;

on the other hand, the first camera 11 can also shoot the first wall 221 at a different point in the second direction Y relative to the first wall 221, and the second camera 21 can shoot the second wall 222 at a different point in the first direction X relative to the second wall 222, so that the shooting accuracy of the battery welding detection system 100 can be effectively improved;

On the other hand, the position of the first camera 11 in the second direction Y and the position of the second camera 21 in the first direction X can be flexibly adjusted for different battery cells 200, so that the applicability of the battery welding detection system 100 can be effectively improved.

In some embodiments, the first acquisition unit 10 further includes a third driving component 13, where the third driving component 13 is connected between the first driving component 12 and the first camera 11, and the third driving component 13 can drive the first camera 11 to move along a third direction Z, where the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The second acquisition unit 20 further comprises a fourth driving member 23, the fourth driving member 23 being connected between the second driving member 22 and the second camera 21, the fourth driving member 23 being capable of driving the second camera 21 to move in the third direction Z.

Illustratively, during the process of photographing the first wall 221 by the first camera 11, the third driving part 13 can drive the first camera 11 to move along the third direction Z, so that the first camera 11 photographs a plurality of points in the third direction Z. As an example, in the case where the field of view of the first camera 11 in the third direction Z is smaller than the size of the first wall 221 in the third direction Z, the first camera 11 is moved in the third direction Z by the third driving part 13, and different positions of the first wall 221 in the third direction Z can be photographed to acquire a complete photographed image of the first wall 221 in the third direction Z. As another example, in the case where the field of view of the first camera 11 in the third direction Z is greater than or equal to the size of the first wall 221 in the third direction Z, the first camera 11 is moved in the third direction Z by the third driving part 13, and the first wall 221 can be photographed at different points in the third direction Z with respect to the first wall 221 to improve photographing accuracy.

In the process of photographing the second wall 222 by the second camera 21, the fourth driving part 23 can drive the second camera 21 to move in the third direction Z so that the second camera 21 photographs a plurality of points in the third direction Z. As an example, in the case where the field of view of the second camera 21 in the third direction Z is smaller than the size of the second wall 222 in the third direction Z, the second camera 21 is moved in the third direction Z by the driving of the fourth driving part 23, and different positions of the second wall 222 in the third direction Z can be photographed to acquire a complete photographed image of the second wall 222 in the third direction Z. As another example, in the case where the field of view of the second camera 21 in the third direction Z is greater than or equal to the size of the second wall 222 in the third direction Z, the second camera 21 is moved in the third direction Z by the drive of the fourth driving part 23, and the second wall 222 can be photographed at different points in the third direction Z with respect to the second wall 222 to improve photographing accuracy.

Alternatively, the third driving part 13 and the fourth driving part 23 may include, but are not limited to, driving members including a driving motor, a driving cylinder, or a driving cylinder.

As such, by providing the third driving part 13 and the fourth driving part 23, on the one hand, the visual field performance of the first camera 11 in the third direction Z can be made not limited by the dimension of the first wall 221 in the third direction Z, thereby increasing the selectable range of the first camera 11, and the visual field performance of the second camera 21 in the third direction Z can be made not limited by the dimension of the second wall 222 in the third direction Z, thereby increasing the selectable range of the second camera 21, thereby further increasing the configuration flexibility of the battery welding detection system 100;

on the other hand, the first camera 11 can also photograph the first wall 221 at a different point in the third direction Z with respect to the first wall 221, and the second camera 21 can photograph the second wall 222 at a different point in the third direction Z with respect to the second wall 222, so that the photographing accuracy of the battery welding detection system 100 can be further improved;

On the other hand, the position of the first camera 11 in the third direction Z can be flexibly adjusted for different battery cells 200, and the position of the second camera 21 in the third direction Z can be flexibly adjusted, so that the applicability of the battery welding detection system can be further improved.

Based on the battery welding detection system provided by the embodiment of the application, the embodiment of the application also provides a battery welding detection method. In the battery welding detection method provided by the embodiment of the application, the execution main body can be an electronic device with a data processing function. For example, a processor may be included in the electronic device, and the battery welding detection method provided by the embodiment of the application may be implemented by the processor through running a program or instructions. The battery welding detection method provided by the embodiment of the application is described below with reference to the accompanying drawings and specific embodiments.

Fig. 11 is a flowchart of a battery welding detection method according to an embodiment of the present application, and in combination with fig. 11, the method may include steps 1101 to 1103.

Step 1101, in the case that the battery cell is located in the battery welding detection system, sending a first control signal to the first acquisition unit through the lower computer, and sending a second control signal to the second acquisition unit through the lower computer, wherein two first cameras in the first acquisition unit are respectively used for responding to the first control signal to shoot two first walls of the battery cell, which are opposite in the first direction, and generating a first image of each first wall, and the two first cameras are opposite in the first direction; two second cameras in the second acquisition unit are respectively used for responding to second control signals to shoot two second walls of the battery cell, which are opposite in the second direction, and generating a second image of each second wall, wherein the two second cameras are opposite in the second direction, and the first direction is intersected with the second direction;

Step 1102, obtaining image data of the surface of the battery cell through an upper computer, wherein the image data comprises a first image of each first wall and a second image of each second wall of the battery cell;

in step 1103, the first image and the second image are respectively identified by the upper computer, so as to obtain a detection result of the surface of the battery cell, where the detection result includes that the surface of the battery cell has a defect or the surface of the battery cell has no defect.

The above steps are described in detail below, and are specifically described below.

First, referring to steps 1101 and 1102 described above, in the case that it is detected that a battery cell is moved into the battery welding detection system, the lower computer may transmit a first control signal to the first acquisition unit and a second control signal to the second acquisition unit.

Specifically, a first wall and a second wall may be included on the cell surface. And the two first cameras in the first acquisition unit are respectively used for responding to the first control signals to shoot two first walls of the battery cell, which are opposite in the first direction, and generating a first image of each first wall.

And the two second cameras in the second acquisition unit are respectively used for responding to the second control signals to shoot two second walls of the battery cell, which are opposite in the second direction, and generating a second image of each second wall.

In an exemplary embodiment, after the battery cell enters the shooting range of the acquisition unit in the battery welding detection system, the first cameras located on two opposite sides of the battery cell in the first direction in the battery welding detection system may respectively shoot the two first walls to obtain a first image corresponding to each first wall. The second cameras positioned on two sides of the battery cell, which are opposite to each other in the second direction, of the battery welding detection system can respectively shoot the two second walls so as to obtain a second image corresponding to each second wall.

Each collecting unit can correspond to a preset collecting position, and when a battery monomer to be tested enters the welding system, the collecting units can move to the preset collecting positions to shoot the battery monomer. Optionally, different collection positions can be set for the battery monomers of different models and sizes respectively so as to meet imaging requirements and reduce the risk of occurrence of detection blind areas.

Optionally, at two first cameras and two second cameras opposite along the second direction along the opposite first direction to after the battery monomer gets into the shooting scope of collection unit, first camera and second camera can shoot the battery lateral wall respectively, thereby the holistic image data of lateral wall that can be convenient, and first camera and second camera can carry out the shooting task simultaneously, thereby are favorable to practicing thrift shooting time, satisfy the production speed of production line.

Illustratively, as shown in connection with fig. 1, taking the first direction as an example of the thickness direction of the battery cell, the first image may include an image of the first wall 221 as shown in fig. 1. Taking the second direction as the length direction of the battery cell as an example, the second image may include an image of the second wall 222 as shown in fig. 1.

After obtaining the first image corresponding to each first wall and the second image corresponding to each second wall of the battery cell, the upper computer then involves the step 1103 of identifying the first image and the second image respectively, so as to obtain a detection result of the surface of the battery cell.

Alternatively, a trained defect recognition model may be adopted, and the first image and the second image are respectively input into a preset defect recognition model, so as to obtain a detection result of the surface of the battery cell. After inputting the image into the preset defect recognition model, the preset defect recognition model can detect whether the image comprises image features corresponding to defects or not, and output a recognition result of the image when the image comprises the image features corresponding to the defects, wherein the recognition result is that the surface corresponding to the image has the defects or has no defects.

In some embodiments, the first image may be identified as corresponding to a first wall, and the second image may be identified as corresponding to a second wall.

The detection results of the surfaces of the battery cells may include identification results respectively output for the first image and the second image, and optionally, the identification results of the surfaces of the battery cells may be fused and summarized to generate detection results. For example, if at least one of the identification results is that the surface is defective, it may be determined that the surface of the battery cell is defective; if each identification result is that the surface is not defective, the surface of the battery cell is determined to be not defective.

According to the embodiment of the application, the position of each camera can be adjusted according to the detection precision requirement, based on the position, the image acquisition is carried out on the surface of the battery monomer after the welding procedure, the obtained image of the surface of the battery monomer is high in definition and obvious in characteristics, and then the image is identified, so that the detection result can be obtained quickly, and the accuracy of the detection result is improved effectively.

In some embodiments, the detection result further comprises: defect categories of defects, the defect categories including: raised defects, recessed defects, or smudge defects.

Specifically, in the imaging process, different defect types can respectively present different image features in the image, so that the different image features can be used as the basis of whether defects exist on the surface of the battery cell.

For example, the welding slag is attached to the surface of the battery monomer, and may form a protrusion with any shape, for convenience of understanding, taking a circle as an example, fig. 12 is one of defect image feature diagrams provided in the embodiment of the present application, and in combination with the protrusion defect shown in fig. 12, when the welding slag is imaged after light irradiation, the welding slag presents a locally highlighted feature corresponding to the right side in the image 1201.

In the welding process, some molten pools leave a pit after metal escapes, wherein the pit can be of any shape, and for convenience of understanding, for example, fig. 13 is a schematic diagram of a defect image feature provided by an embodiment of the present application, and in combination with the concave defect shown in fig. 13, after the molten pool is irradiated by light, the molten pool is locally highlighted corresponding to the left side in the image 1301 when the molten pool is imaged.

In the welding process, dirt may remain on the weld bead surface due to dirt on the surface of the press roller, dirt adheres to the surface of the battery monomer in the process that the battery monomer flows through the weld bead, and for convenience of understanding, fig. 14 is a third schematic diagram of defect image features provided by the embodiment of the application, and in combination with the circular dirt shown in fig. 14, when the welding slag is irradiated by light, the left side and the right side of the welding slag corresponding to the image 1401 are highlighted.

As a specific example, a hybrid data camera may be used as an example, where the hybrid data camera may include a multi-spectral light source. Fig. 15 is a schematic diagram of a light emitting unit according to an embodiment of the present application, and in combination with fig. 15, a multispectral light source may be divided into 8 light regions, each light region is 45 ° and each light region may be configured with the same number of light beads and the same color.

During shooting, each light source light zone may be lit up in turn, starting from light source light zone 1, either clockwise or counter-clockwise. In the process of turning on and off each light source light area, one or more camera image capturing can be carried out, namely, after all light sources of the light areas are turned on and off once, a mixed data camera can acquire and obtain a plurality of images, the mixed data camera outputs images of different channels according to the exposure images of different light areas, each channel presents different defect characteristics, and optionally, the image presented by the channel with the most obvious characteristic can be selected as a detection image according to the definition of each image, so that the reliability of a detection result is improved.

Based on the above, in the image for identifying whether the surface of the battery cell has defects, different defect types can respectively present different image features in the image, so that the defect detection accuracy can be effectively improved.

In some embodiments, because of the difference in the sizes of the surfaces of the different battery cells, in order to adapt to the sizes of the different battery cells conveniently, the definition of the image of the surface of the battery cell is improved, specifically, each first camera comprises a first sub-camera and a second sub-camera, and the first sub-camera and the second sub-camera are arranged along the second direction; one of the two first sub-cameras and the two second cameras is arranged at the first collecting station, the other of the two second sub-cameras and the two second cameras is arranged at the second collecting station, and the first collecting station and the second collecting station are arranged along the second direction.

Based on the battery welding system provided by the embodiment of the application, the upper computer can acquire the image data of the surface of the battery monomer, and reference can also be made to steps 301 to 304.

Step 301, under the condition that the battery monomer is located at the first collecting station, corresponding to a first part of each first wall, controlling the first sub-camera to move to each first preset position through the lower computer, and shooting to obtain a first sub-image corresponding to the first part; the second camera in the first acquisition station is controlled to move to each second preset position through the lower computer, and second sub-images corresponding to the second wall are shot and obtained, wherein the number of the first preset positions is at least one, and the number of the second preset positions is at least one;

step 302, controlling the battery monomer to move to a second acquisition station through a lower computer, and under the condition that the battery monomer is positioned at the second acquisition station, corresponding to a second part of each first wall, controlling a second sub-camera to move to a third preset position through the lower computer, and shooting to obtain a third sub-image corresponding to the second part; the second camera in the second acquisition station is controlled to move to a fourth preset position through the lower computer, and a fourth sub-image corresponding to the second wall is obtained through shooting, wherein the number of the third preset positions is at least one, and the number of the fourth preset positions is at least one;

Step 303, splicing the first sub-image and the third sub-image through the upper computer corresponding to each first wall to obtain a first image corresponding to each first wall;

And 304, splicing the second sub-images and the fourth sub-images through the upper computer corresponding to each second wall to obtain a second image corresponding to each second wall.

It should be understood that the foregoing serial numbers are only used to understand the specific implementation of the embodiments of the present application, and are not meant to limit the specific order in which each step is performed.

Specifically, corresponding to the size of the battery cell, each sub-camera corresponds to a different preset position. Under the condition that the number of the preset positions is multiple, the sub-cameras can be respectively moved to each preset position to shoot.

Alternatively, the number of preset positions may be determined according to the field of view of the imaging of the sub-camera and the size of the battery cell. After the sub-cameras are respectively moved to each preset position to shoot, the imaging can be completed in the area with higher probability of occurrence of the defects on the battery cells, and shooting and detecting efficiency can be further improved under the condition that the defects on the battery cells are effectively detected.

In an alternative embodiment, a first sub-camera located at a first acquisition station may be configured to capture a first portion of a first wall of a battery cell, while a second sub-camera located at a second acquisition station is configured to capture a second portion of the first wall of the battery cell.

In yet another alternative embodiment, the first sub-camera at the first acquisition station may be configured to capture a second portion of the first wall of the battery cell, and the second sub-camera at the second acquisition station may be configured to capture a first portion of the first wall of the battery cell.

For example, fig. 16 is a schematic diagram of a preset position provided in an embodiment of the present application, and in conjunction with fig. 16, taking the first capturing station 110 as an example for capturing images of the second portion 2212 of the first wall of the battery unit, the number of the first preset positions 1601 is 4, and the first sub-camera may capture a first sub-image at each first preset position, where each first preset position may capture one or more first sub-images, and optionally, in a case where a plurality of first sub-images are captured at one first preset position, one image with the highest sharpness may be screened from the plurality of first sub-images to generate the first image. After the shooting of the first sub-camera in the first acquisition station is completed, overlapping exists between two adjacent first sub-images obtained by the first sub-camera located at the first preset position.

Next, the battery cell is controlled to move toward the second acquisition station 120, and photographing is continued according to the above manner. Thereby, there is an overlap between two adjacent third sub-images obtained by the second sub-camera being located at the third preset position.

In addition, as further shown in connection with fig. 16, the imaging area corresponding to the first preset position 1601 relates to the first portion 2211 of the first wall of the battery cell, and the third preset position 1602 is one of the acquisition positions corresponding to the second sub-camera, where there is an overlap between the first sub-image corresponding to the first preset position 1601 and the third sub-image corresponding to the third preset position 1602.

Based on this, the plurality of first sub-images corresponding to the first portion 2211 of the first wall 221 and the plurality of third sub-images corresponding to the second portion 2212 of the first wall 221 may be spliced according to the overlapping portion between the adjacent two sub-images, so as to obtain the first image corresponding to the first wall 221.

Based on the same or similar photographing manner as the first portion 2211 of the first wall, a first image corresponding to each first wall and a second image corresponding to each second wall of the battery cell may be obtained, which are not described herein for brevity.

According to the embodiment of the application, the first acquisition station and the second acquisition station are arranged to carry out sequencing shooting on the battery monomers, so that the interference between a plurality of cameras can be reduced when the cameras shoot simultaneously, and the shooting quality of a battery welding detection system can be improved.

In some embodiments, the step 401 to 403 may include identifying, by the upper computer, the first image and the second image, respectively, to obtain a detection result of the surface of the battery cell.

Step 401, acquiring an image corresponding to a first target area in a first image by an upper computer to obtain a first image to be tested, wherein the first target area is an area on a first wall, which is close to a first welding line; and

Step 402, acquiring an image corresponding to a second target area in a second image through an upper computer to obtain a second image to be detected, wherein the second target area is an area on a second wall, which is close to a second welding seam;

Step 403, generating a detection result of the surface of the battery monomer according to the first to-be-detected image and the second to-be-detected image by the upper computer.

Specifically, the first target area and the second target area may be determined according to distribution areas of defects, respectively. For example, during the manufacture of the battery cell, after the end cap is welded to the housing, a first weld may be formed between the end cap and the first wall, and a second weld may be formed between the end cap and the second wall. Therefore, the area near the weld is often distributed with defects caused by slag, slag fall-off, or dirt. For example, the first region 230 and the second region 240 shown in fig. 4 may be regarded as the first target region.

Before the first image is identified, the first target area can be extracted, and before the second image is identified, the second target area can be extracted, the target area with higher probability of occurrence of defects on the battery cells can be detected more specifically, and under the condition that the defects on the battery cells are kept to be detected effectively, the shooting and detecting efficiency can be further improved.

In order to better understand the battery welding detection system provided by the embodiment of the application, based on the same inventive concept, the embodiment of the battery welding detection system in practical application is provided herein for explanation.

The embodiment of the application provides a battery welding detection system, which comprises a first acquisition unit and a second acquisition unit, wherein the first acquisition unit comprises two first cameras which are opposite along a first direction, and the two first cameras are respectively used for shooting two first walls of a battery monomer which are opposite along the first direction. The second acquisition unit comprises two second cameras which are opposite along a second direction, the two second cameras are respectively used for shooting two second walls of the battery cell which are opposite along the second direction, and the first direction is intersected with the second direction.

In some embodiments, the first camera comprises a first sub-camera and a second sub-camera, the first sub-camera and the second sub-camera being arranged along a second direction; the first sub-camera is used for shooting a first part of the first wall, the second sub-camera is used for shooting a second part of the first wall, and the first part is connected with the second part and is distributed along a second direction. Based on this, by dividing the first wall into the first portion and the second portion in the second direction, and arranging the first camera to include the first sub-camera and the second sub-camera to photograph the first portion and the second portion, respectively, the photographing accuracy of the whole of the first camera can be improved, which is advantageous in improving the reliability of the battery welding detection system.

In some embodiments, one of the two first sub-cameras and the two second cameras is disposed at the first acquisition station, and the other of the two second sub-cameras and the two second cameras is disposed at the second acquisition station, the first acquisition station and the second acquisition station being arranged along the second direction.

Specifically, the first acquisition unit further comprises a first driving component, the first driving component is connected to the first camera, and the first driving component can drive the first camera to move along the second direction. The second acquisition unit further comprises a second driving component, the second driving component is connected to the second camera, and the second driving component can drive the second camera to move along the first direction.

Based on the battery welding detection system provided by the embodiment of the application, the image of the battery monomer is collected, and the following steps can be combined specifically:

In step 501, the lower computer controls the battery cell to be located at the first collecting station.

Step 502, controlling a first sub-camera to move to a first preset position by a lower computer to shoot a first part of a first wall, so as to obtain a first sub-image corresponding to the first preset position; and controlling a second camera in the first acquisition station to move to a second preset position through the lower computer to respectively shoot, so as to obtain a second sub-image corresponding to the second preset position.

As shown in connection with fig. 16, the second camera 21 and the first sub-cameras 111 located at both sides of the cell length direction Y are included in the first collecting station.

After the battery cell is located at the first collecting station, the second camera 21 in the first collecting station and the first sub-cameras 111 located at both sides of the battery cell in the length direction Y trigger photographing.

Specifically, in the first collecting station, the first sub-camera 111 located at one side of the battery cell in the length direction Y photographs at the first preset position 1601, after that, the first sub-camera 111 moves (to the right in the drawing), optionally, the moving distance is a preset distance, reaches the second first preset position, the first sub-camera 111 photographs again, and so on until the first sub-camera 111 photographs at the last first preset position.

In the first collecting station, the first sub-camera 111 located at the other side of the battery cell in the length direction Y photographs at a first preset position, after which the first sub-camera 111 moves (to the right in the drawing), optionally, the moving distance is a preset distance, reaches a second first preset position, the first sub-camera 111 photographs again, and so on until the first sub-camera 111 photographs at the last first preset position.

In the first acquisition station, the second camera 21 takes a photograph at a first second preset position 1604, after which the second camera 21 is moved (shown as upwards in the figure), optionally by a preset distance, to a second preset position, the second camera 21 takes a photograph again, and so on until the second camera 21 takes a photograph at the last second preset position.

As shown in fig. 16, the second camera 21 is moved twice, three shots are performed, and the first sub-cameras 111 located at both sides of the battery cell in the longitudinal direction are respectively moved three times, four shots are performed.

Based on the image acquisition steps corresponding to the first acquisition stations are completed.

Optionally, when the battery cell moves to the second acquisition station, the first sub-camera and the second sub-camera in the first acquisition station can be automatically reset, so that the next battery cell can be subjected to image acquisition.

In step 503, the lower computer controls the battery unit to be located at the second collecting station.

Step 504, controlling the second sub-camera to move to a third preset position by the lower computer to shoot the second part of the first wall, so as to obtain a third sub-image corresponding to the third preset position; and controlling a second camera in the second acquisition station to move to a fourth preset position for shooting, so as to obtain a fourth sub-image corresponding to the fourth preset position.

After the battery cell is located at the second collecting station 120, the second camera 21 in the second collecting station and the second sub-cameras 112 located at both sides of the battery cell in the length direction trigger photographing.

The moving modes of the second camera 21 in the second collecting station and the second sub-cameras 112 located at two sides of the length direction of the battery cell are the same as the moving modes of the cameras included in the first collecting station, and for brevity, the moving modes of the cameras in the second collecting station are not repeated here.

Through setting up first collection station and second collection station to carry out the order shooting to battery monomer, can reduce the interference each other when a plurality of cameras shoot simultaneously, be favorable to improving battery welding detecting system's shooting quality.

Step 505, corresponding to each first wall through the upper computer, splicing the first sub-image and the third sub-image to obtain a first image corresponding to each first wall, corresponding to each second wall, splicing the second sub-image, and splicing the fourth sub-image to obtain a second image corresponding to each second wall.

Step 506, obtaining an image corresponding to the first target area in the first image through the upper computer, so as to obtain a first image to be tested; acquiring an image corresponding to the second target area from the second image to obtain a second image to be detected;

the first target area is an area on the first wall, which is close to the first welding line, and the second target area is an area on the second wall, which is close to the second welding line.

The first target area and the second target area may be determined according to distribution areas of defects, respectively. The area near the weld is typically distributed with defects caused by slag, slag fall-off, or dirt.

In step 507, the upper computer respectively identifies the first to-be-detected image and the second to-be-detected image to obtain a detection result of the surface of the battery cell.

Illustratively, the detecting results further include: defect categories of defects, the defect categories including: raised defects, recessed defects, or smudge defects.

According to the embodiment of the application, the first target area and the second target area are acquired, so that the target area with higher occurrence probability of the defects on the battery cells can be detected more pertinently, and the shooting and detecting efficiency can be further improved under the condition that the defects on the battery cells are kept to be detected effectively.

According to the embodiment of the application, the position of each camera can be adjusted according to the detection precision requirement, based on the position, the image acquisition is carried out on the surface of the battery monomer after the welding procedure, the obtained image of the surface of the battery monomer is high in definition and obvious in characteristics, and then the image is identified, so that the detection result can be obtained quickly, and the accuracy of the detection result can be improved effectively.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may 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 encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery welding inspection system, comprising: the system comprises an upper computer, a lower computer and an imaging assembly, wherein the imaging assembly comprises a first acquisition unit and a second acquisition unit;

The first acquisition unit comprises two first cameras which are opposite along a first direction, wherein the two first cameras are respectively used for responding to first control signals of the lower computer to shoot two first walls of a battery cell which are opposite along the first direction and generate first images of each first wall, the battery cell comprises an end cover and a shell, the end cover is welded to the shell, and the first walls and the second walls are both positioned on the shell; the first camera is used for shooting a first area on the first wall, and part of the edge of the first area coincides with a first welding line between the end cover and the first wall;

The second acquisition unit comprises two second cameras which are opposite along a second direction, the two second cameras are respectively used for responding to a second control signal of the lower computer to shoot two second walls of the battery cell which are opposite along the second direction, and generate a second image of each second wall, the first direction intersects with the second direction, wherein the second cameras are used for shooting a second area on the second wall, and part of edges of the second area coincide with a second welding seam between the end cover and the second wall;

the upper computer is used for acquiring image data, wherein the image data comprises a first image corresponding to each first wall of the battery cell and a second image corresponding to each second wall, the first image comprises an image corresponding to a first target area, and the first target area is an area, close to a first welding seam, on the first wall; the second image comprises an image corresponding to a second target area, wherein the second target area is an area, close to a second welding line, on the second wall;

The upper computer is further used for respectively identifying the first image and the second image to obtain a detection result of the surface of the battery monomer, wherein the detection result comprises that the surface of the battery monomer has defects or the surface of the battery monomer has no defects;

The first acquisition unit further comprises a first driving component, the first driving component is connected with the first camera, and the first driving component can drive the first camera to move along the second direction;

The second acquisition unit further comprises a second driving component, wherein the second driving component is connected with the second camera and can drive the second camera to move along the first direction;

the battery cell comprises an end cover and a shell, wherein the end cover is welded to the shell, and the first wall and the second wall are both positioned on the shell.

2. The battery weld inspection system of claim 1, wherein the first camera comprises a first sub-camera and a second sub-camera, the first sub-camera and the second sub-camera being arranged along the second direction;

The first sub-camera is used for shooting a first part of the first wall, the second sub-camera is used for shooting a second part of the first wall, and the first part is connected with the second part and is arranged along the second direction.

3. The battery weld inspection system of claim 2, wherein the imaging assembly further comprises a lighting unit disposed in one-to-one correspondence with each of the target cameras in the imaging assembly, wherein the target cameras included in the imaging assembly are the first sub-camera, the second sub-camera, and the second camera, respectively;

Each light emitting unit comprises a plurality of light areas, and the plurality of light areas included in each light emitting unit are arranged around a target camera corresponding to the light emitting unit;

The target camera is configured to perform photographing while each light zone in the light emitting unit emits light, corresponding to each light emitting unit.

4. The battery welding detection system of claim 2, wherein,

One of the two first sub-cameras and the two second cameras is arranged at a first acquisition station, and the other of the two second sub-cameras and the two second cameras is arranged at a second acquisition station;

5. The battery welding detection system of claim 1, wherein the first acquisition unit further comprises a third drive component connected between the first drive component and the first camera, the third drive component capable of driving the first camera to move in a third direction, the first direction, the second direction, and the third direction being perpendicular to each other;

The second acquisition unit further comprises a fourth driving component, the fourth driving component is connected between the second driving component and the second camera, and the fourth driving component can drive the second camera to move along the third direction.

6. A battery welding detection method, characterized by comprising:

Under the condition that the battery monomers are located at a first collecting station, corresponding to a first part of each first wall, controlling the first sub-camera to move to each first preset position through a lower computer, and shooting to obtain a first sub-image corresponding to the first part; the second camera in the first acquisition station is controlled to move to each second preset position through the lower computer, and second sub-images corresponding to the second wall are shot and obtained, wherein the number of the first preset positions is at least one, and the number of the second preset positions is at least one;

7. The method of claim 6, wherein the step of providing the first layer comprises,

In the case that the surface of the battery cell has a defect, the detection result further includes: a defect class of the defect, the defect class comprising: raised defects, recessed defects, or smudge defects.

8. The method of claim 6, wherein the identifying, by the host computer, the first image and the second image respectively, to obtain the detection result of the surface of the battery cell includes: