Tab inspection system and method

Abstract

Disclosed in the present application are a tab inspection system and method. The system comprises: at least one tab outer-side inspection station, which is used for controlling an outer-side prism to move on the basis of an outer-side displacement, so as to perform imaging on the outer side of a tab by means of the outer-side prism, and collecting an image in the outer-side prism, so as to obtain a tab outer-side image, wherein the tab outer-side image is used for determining a tab outer-side inspection result, and the outer-side displacement is a displacement of the outer-side prism in a width direction, which displacement is determined on the basis of actual coordinates of the outer side of the tab and reference coordinates of the outer side of the tab; and at least one tab inner-side inspection station, which is used for controlling an inner-side prism to move on the basis of an inner-side displacement, so as to perform imaging on the inner side of the tab by means of the inner-side prism, and collecting an image in the inner-side prism, so as to obtain a tab inner-side image, wherein the tab inner-side image is used for determining a tab inner-side inspection result, and the inner-side displacement is a displacement of the inner-side prism in the width direction, which displacement is determined on the basis of actual coordinates of the inner side of the tab and reference coordinates of the inner side of the tab. In this way, the detection of an appearance defect of a tab can be realized.

Description

Tab detection system and method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Chinese patent application 202410146496.7, filed on February 1, 2024, entitled “Tab Detection System and Method”, and the priority of Chinese patent application 202510083739.1, filed on January 20, 2025, entitled “Tab Detection System and Method”, and the entire contents of the above two applications are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of visual inspection, and in particular to a tab inspection system and method. Background Art

[0004] During battery production, the cathode, anode, and separator are wound together to form a bare cell. This process can produce bare cells with defects such as folded, misaligned, missing, or cracked tabs, which can have a negative impact on battery safety.

[0005] Therefore, a solution for detecting tab appearance defects is needed. Summary of the Invention

[0006] The present application provides a tab detection system and method, which can detect tab appearance defects.

[0007] In a first aspect, the present application provides a tab detection system, which may include: at least one tab outer side detection station, which is used to control the outer prism to move according to the outer displacement when the battery cell assembly reaches the tab outer side detection station, so as to image the outer side of the tab of the battery cell assembly through the outer prism, collect the image in the outer prism, and obtain the tab outer side image, and the tab outer side image is used to determine the tab outer side detection result, and the outer displacement is the displacement of the outer prism in the width direction determined based on the actual coordinates of the tab outer side of the battery cell assembly and the tab outer side reference coordinates; at least one tab inner side detection station, which is used to control the inner prism to move according to the inner displacement when the battery cell assembly reaches the tab inner side detection station, so as to image the inner side of the tab of the battery cell assembly through the inner prism, collect the image in the inner prism, and obtain the tab inner side image, and the tab inner side image is used to determine the tab inner side detection result, and the inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the tab inner side of the battery cell assembly and the tab inner side reference coordinates.

[0008] Thus, when the battery cell assembly reaches the outer tab inspection station, the outer prism can be controlled to move according to the outer displacement to image the outer side of the battery cell assembly's tab through the outer prism, and the image captured by the outer prism is obtained to obtain an image of the outer side of the tab; when the battery cell assembly reaches the inner tab inspection station, the inner prism can be controlled to move according to the inner displacement to image the inner side of the battery cell assembly's tab through the inner prism, and the image captured by the inner prism is obtained to obtain an image of the inner side of the tab. The outer side of the tab image can be used to determine the outer side of the tab inspection result, and the inner side of the tab image can be used to determine the inner side of the tab inspection result, thereby enabling the detection of tab appearance defects. In addition, the above-mentioned outer displacement is the displacement of the outer prism in the width direction determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. That is to say, the position of the outer prism can be dynamically adjusted according to the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab to avoid the situation where the tab is misplaced and the outer prism can only be extended to a fixed position, causing the outer prism to hit the outside of the tab, thereby causing a safety hazard; similarly, the above-mentioned inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab. The position of the inner prism can be dynamically adjusted according to the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab to avoid the situation where the tab is misplaced and the inner prism can only be extended to a fixed position, causing the inner prism to hit the inside of the tab, thereby causing a safety hazard.

[0009] In some embodiments, the system may further include: a tab position detection station, located upstream of at least one tab outer side detection station and at least one tab inner side detection station, for collecting a tab image of the battery cell assembly when the battery cell assembly arrives at the tab position detection station, and determining the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image.

[0010] In this way, the tab image can be collected through the tab position detection station to quickly and accurately determine the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab.

[0011] In some embodiments, the system may further include: the tab position detection station is also used to collect a reference tab image of the reference battery cell assembly when the reference battery cell assembly arrives at the tab position detection station, and determine the tab outer reference coordinates and tab inner reference coordinates of the reference battery cell assembly based on the reference tab image.

[0012] In this way, the reference tab image can be collected through the tab position detection station to quickly and accurately determine the reference coordinates of the outer side of the tab and the reference coordinates of the inner side of the tab.

[0013] In some embodiments, the system may further include: a host computer for determining the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, and determining the inner displacement of the inner prism in the width direction based on the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab.

[0014] In this way, the data can be processed by the host computer to accurately determine the outer displacement of the outer prism and the inner displacement of the inner prism.

[0015] In some embodiments, the above-mentioned outer side detection station of the tab may include: an outer lower computer, which is electrically connected to the upper computer, the outer drive assembly and the outer camera, respectively, and is used to receive the outer displacement sent by the upper computer, generate an outer drive instruction based on the outer displacement, send the outer drive instruction to the outer drive assembly, and send the outer side image acquisition instruction of the tab to the outer camera; the outer drive assembly is mechanically connected to the outer prism, and is used to drive the outer prism to move based on the outer drive instruction; the outer prism is used to image the outside of the tab; the outer camera is electrically connected to the upper computer, and is used to respond to the outer side image acquisition instruction of the tab, collect the image in the outer prism, obtain the outer side image of the tab, and send the outer side image of the tab to the upper computer; the upper computer is also used to perform appearance defect detection on the outer side of the tab based on the outer side image of the tab, and obtain the outer side detection result of the tab.

[0016] In this way, by setting an outer lower computer, an outer drive assembly, an outer prism and an outer camera at the outer side inspection station of the tab, the appearance defect detection of the outer side of the tab can be achieved collaboratively.

[0017] In some embodiments, the above-mentioned outer drive component may include: an outer motor, electrically connected to the outer lower computer, and mechanically connected to the first end of the outer connecting rod, for driving the outer connecting rod to move based on the outer drive instruction sent by the outer lower computer; an outer connecting rod, the second end of the outer connecting rod is mechanically connected to the outer prism, and the outer connecting rod is used to drive the outer prism to move.

[0018] In this way, by controlling the outer prism to move in the width direction and the height direction through the above process, the outer prism can be accurately moved to an appropriate position so that the outer prism can image the outer side of the tab.

[0019] In some embodiments, the second end of the outer connecting rod is also mechanically connected to the outer camera, and the outer connecting rod is also used to drive the outer camera to move.

[0020] In this way, by mechanically connecting the second end of the outer connecting rod to the outer camera, the relative position between the outer camera and the outer prism can be ensured to remain unchanged, thereby avoiding the outer camera being unable to capture the image of the outside of the outer ear in the outer prism due to the movement of the outer prism in the width direction.

[0021] In some embodiments, the external camera is provided with an external liquid lens, which is electrically connected to the external lower computer; the external lower computer is also used to send multiple external voltage signals to the external liquid lens; the external liquid lens is used to change its own focal length based on each external voltage signal; the external camera is also used to respond to the image acquisition instruction of the outer side of the tab, and after each zoom of the external liquid lens, it collects the image in the outer prism to obtain multiple images of the outer side of the tab, and sends the multiple images of the outer side of the tab to the upper computer; the upper computer is also used to fuse the multiple images of the outer side of the tab into a target image of the outer side of the tab, and perform appearance defect detection on the outer side of the tab based on the target image of the outer side of the tab to obtain the detection result of the outer side of the tab.

[0022] In this way, the outer liquid lens can be zoomed to capture multiple images of the outer side of the tab with different focal lengths, which can be fused into a clearer target outer side image. Based on the clearer target outer side image, the outer side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0023] In some embodiments, the above-mentioned inner side inspection station of the tab may include: an inner side lower computer, which is electrically connected to the upper computer, the inner side drive assembly and the inner side camera, respectively, and is used to receive the inner side displacement sent by the upper computer, generate an inner side drive instruction based on the inner side displacement, send the inner side drive instruction to the inner side drive assembly, and send the inner side image acquisition instruction of the tab to the inner camera; the inner side drive assembly is mechanically connected to the inner side prism, and is used to drive the inner side prism to move based on the inner side drive instruction; the inner side prism is used to image the inside of the tab; the inner side camera is electrically connected to the upper computer, and is used to respond to the inner side image acquisition instruction of the tab, collect the image in the inner side prism, obtain the inner side image of the tab, and send the inner side image of the tab to the upper computer; the upper computer is also used to perform appearance defect detection on the inside of the tab based on the inner side image of the tab, and obtain the inner side inspection result of the tab.

[0024] In this way, by setting up an inner lower machine, an inner drive assembly, an inner prism and an inner camera at the inner side inspection station of the tab, the appearance defect detection of the inner side of the tab can be achieved collaboratively.

[0025] In some embodiments, the above-mentioned inner drive component may include: an inner motor, electrically connected to the inner lower computer, and mechanically connected to the first end of the inner connecting rod, for driving the inner connecting rod to move based on the inner drive instruction sent by the inner lower computer; an inner connecting rod, the second end of the inner connecting rod is mechanically connected to the inner prism, and the inner connecting rod is used to drive the inner prism to move.

[0026] In this way, the inner prism can be moved quickly and accurately according to the inner displacement through the inner motor and the inner connecting rod.

[0027] In some embodiments, the second end of the inner connecting rod is also mechanically connected to the inner camera, and the inner connecting rod is also used to drive the inner camera to move.

[0028] In this way, by mechanically connecting the second end of the inner connecting rod to the inner camera, the relative position between the inner camera and the inner prism can be ensured to remain unchanged, thereby avoiding the inner camera being unable to capture the image of the inner side of the tab in the inner prism due to the movement of the inner prism in the width direction.

[0029] In some embodiments, the above-mentioned inner camera is provided with an inner liquid lens, which is electrically connected to the inner lower computer; the inner lower computer is also used to send multiple inner voltage signals to the inner liquid lens; the inner liquid lens is used to change its own focal length based on each inner voltage signal; the inner camera is also used to respond to the inner tab image acquisition instruction, and after each zoom of the inner liquid lens, it captures the image in the inner prism to obtain multiple inner tab images, and sends the multiple inner tab images to the upper computer; the upper computer is also used to fuse the multiple inner tab images into a target inner tab image, and perform appearance defect detection on the inner side of the tab based on the target inner tab image to obtain an inner tab detection result.

[0030] In this way, the inner liquid lens can be zoomed to capture multiple images of the inner side of the tab with different focal lengths, which are fused into a clearer target inner side image. Based on the clearer target inner side image, the inner side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0031] In some embodiments, the above-mentioned tab position detection station may include: a position detection camera, electrically connected to the host computer, for collecting the tab image of the battery cell assembly when the battery cell assembly arrives at the tab position detection station, and sending the tab image to the host computer; the host computer is also used to determine the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image.

[0032] In this way, the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0033] In some embodiments, the position detection camera is also used to capture a reference tab image of the reference battery cell assembly when the reference battery cell assembly arrives at the tab position detection station, and send the reference tab image to the host computer; the host computer is also used to determine the reference coordinates of the outer side and inner side of the tab of the reference battery cell assembly based on the reference tab image.

[0034] In this way, the outer side reference coordinates and the inner side reference coordinates of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0035] In some embodiments, at least one tab outer side inspection station includes two stations, and at least one tab inner side inspection station includes two stations.

[0036] In this way, the tab appearance defect detection of the battery cell assembly can be achieved through one tab position detection station, two tab outer side detection stations and two tab inner side detection stations.

[0037] In a second aspect, the present application provides a tab detection method, which may include: through at least one tab outer side detection station, when the battery cell assembly reaches the tab outer side detection station, controlling the outer prism to move according to the outer displacement, so as to image the outer side of the tab of the battery cell assembly through the outer prism, collecting the image in the outer prism, and obtaining the tab outer side image, the tab outer side image is used to determine the tab outer side detection result, the outer displacement is the displacement of the outer prism in the width direction determined based on the actual coordinates of the tab outer side of the battery cell assembly and the tab outer side reference coordinates; through at least one tab inner side detection station, when the battery cell assembly reaches the tab inner side detection station, controlling the inner prism to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism, collecting the image in the inner prism, and obtaining the tab inner side image, the tab inner side image is used to determine the tab inner side detection result, the inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the tab inner side of the battery cell assembly and the tab inner side reference coordinates.

[0038] Thus, when the battery cell assembly reaches the outer tab inspection station, the outer prism can be controlled to move according to the outer displacement to image the outer side of the battery cell assembly's tab through the outer prism, and the image captured by the outer prism is obtained to obtain an image of the outer side of the tab; when the battery cell assembly reaches the inner tab inspection station, the inner prism can be controlled to move according to the inner displacement to image the inner side of the battery cell assembly's tab through the inner prism, and the image captured by the inner prism is obtained to obtain an image of the inner side of the tab. The outer side of the tab image can be used to determine the outer side of the tab inspection result, and the inner side of the tab image can be used to determine the inner side of the tab inspection result, thereby enabling the detection of tab appearance defects. In addition, the above-mentioned outer displacement is the displacement of the outer prism in the width direction determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. That is to say, the position of the outer prism can be dynamically adjusted according to the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab to avoid the situation where the tab is misplaced and the outer prism can only be extended to a fixed position, causing the outer prism to hit the outside of the tab, thereby causing a safety hazard; similarly, the above-mentioned inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab. The position of the inner prism can be dynamically adjusted according to the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab to avoid the situation where the tab is misplaced and the inner prism can only be extended to a fixed position, causing the inner prism to hit the inside of the tab, thereby causing a safety hazard.

[0039] In some embodiments, the method may further include: collecting a tab image of the battery cell assembly through a tab position detection station when the battery cell assembly arrives at the tab position detection station, and determining the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image, wherein the tab position detection station is located upstream of at least one tab outer side detection station and at least one tab inner side detection station.

[0040] In this way, the tab image can be collected through the tab position detection station to quickly and accurately determine the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab.

[0041] In some embodiments, the method may further include: collecting a reference tab image of the reference battery cell assembly through a tab position detection station when the reference battery cell assembly arrives at the tab position detection station, and determining the tab outer side reference coordinates and tab inner side reference coordinates of the reference battery cell assembly based on the reference tab image.

[0042] In this way, the reference tab image can be collected through the tab position detection station to quickly and accurately determine the reference coordinates of the outer side of the tab and the reference coordinates of the inner side of the tab.

[0043] In some embodiments, the method may further include: determining, by a host computer, the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, and determining the inner displacement of the inner prism in the width direction based on the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab.

[0044] In this way, the data can be processed by the host computer to accurately determine the outer displacement of the outer prism and the inner displacement of the inner prism.

[0045] In some embodiments, the above-mentioned at least one outer tab detection station is used, and when the battery cell assembly reaches the outer tab detection station, the outer prism is controlled to move according to the outer displacement, so as to image the outer side of the tab of the battery cell assembly through the outer prism, collect the image in the outer prism, and obtain the outer side image of the tab. It can include: receiving the outer displacement sent by the upper computer through the outer lower computer, generating an outer drive instruction based on the outer displacement, sending the outer drive instruction to the outer drive component, and sending the outer side image collection instruction of the tab to the outer camera, the outer drive component is mechanically connected to the outer prism; driving the outer prism to move based on the outer drive instruction through the outer drive component; imaging the outer side of the tab through the outer prism; collecting the image in the outer prism through the outer camera in response to the outer side image collection instruction, obtaining the outer side image of the tab, and sending the outer side image of the tab to the upper computer; the method can also include: performing appearance defect detection on the outer side of the tab based on the outer side image of the tab through the upper computer to obtain the outer side detection result of the tab.

[0046] In this way, by setting an outer lower computer, an outer drive assembly, an outer prism and an outer camera at the outer side inspection station of the tab, the appearance defect detection of the outer side of the tab can be achieved collaboratively.

[0047] In some embodiments, the above-mentioned driving of the outer prism to move based on the outer driving instruction through the outer driving component can include: driving the outer connecting rod to move based on the outer driving instruction sent by the outer lower computer through the outer motor, and the outer motor is mechanically connected to the first end of the outer connecting rod; driving the outer prism to move through the outer connecting rod, and the second end of the outer connecting rod is mechanically connected to the outer prism.

[0048] In this way, the outer prism can be moved quickly and accurately according to the outer displacement through the outer motor and the outer connecting rod.

[0049] In some embodiments, the second end of the outer connecting rod is further mechanically connected to the outer camera, and the method may further include: driving the outer camera to move via the outer connecting rod.

[0050] In this way, by mechanically connecting the second end of the outer connecting rod to the outer camera, the relative position between the outer camera and the outer prism can be ensured to remain unchanged, thereby avoiding the outer camera being unable to capture the image of the outside of the outer ear in the outer prism due to the movement of the outer prism in the width direction.

[0051] In some embodiments, the above-mentioned external camera is provided with an external liquid lens, and the method may further include: sending multiple external voltage signals to the external liquid lens through the external lower computer; changing the focal length of the external liquid lens based on each external voltage signal; responding to the external image acquisition instruction of the tab through the external camera, collecting the imaging in the external prism after each zoom of the external liquid lens, obtaining multiple tab external images, and sending the multiple tab external images to the upper computer; the above-mentioned external defect detection of the tab external side based on the tab external images by the upper computer to obtain the tab external detection result may include: fusing the multiple tab external images into a target tab external image through the upper computer, and performing external defect detection on the tab external side based on the target tab external image to obtain the tab external detection result.

[0052] In this way, the outer liquid lens can be zoomed to capture multiple images of the outer side of the tab with different focal lengths, which can be fused into a clearer target outer side image. Based on the clearer target outer side image, the outer side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0053] In some embodiments, before sending multiple external voltage signals to the external liquid lens through the external lower computer as mentioned above, the method may also include: determining the pole lug width based on the pole lug image through the upper computer, determining the reference pole lug width based on the reference pole lug image, determining the pole lug width difference based on the pole lug width and the reference pole lug width, determining the required number of pole lug external images according to the pole lug width difference and the preset voltage change, generating multiple external voltage signals according to the initial voltage, the preset voltage change and the required number of pole lug external images, and sending the multiple external voltage signals to the external lower computer.

[0054] In this way, the multiple external voltage signals generated based on the above process can more reasonably control the focal length of the external liquid lens, so that the multiple obtained tab external images can be fused into a target tab external image with higher overall clarity.

[0055] In some embodiments, the above-mentioned at least one inner tab detection station is used. When the battery cell assembly reaches the inner tab detection station, the inner prism is controlled to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism, collect the image in the inner prism, and obtain the inner tab image. It can include: receiving the inner displacement sent by the upper computer through the inner lower computer, generating an inner drive instruction based on the inner displacement, sending the inner drive instruction to the inner drive component, and sending the inner tab image collection instruction to the inner camera, the inner drive component is mechanically connected to the inner prism; driving the inner prism to move based on the inner drive instruction through the inner drive component; imaging the inside of the tab through the inner prism; collecting the image in the inner prism in response to the inner tab image collection instruction through the inner camera to obtain the inner tab image, and sending the inner tab image to the upper computer; the method can also include: performing appearance defect detection on the inside of the tab based on the inner tab image through the upper computer to obtain the inner tab detection result.

[0056] In this way, by setting up an inner lower machine, an inner drive assembly, an inner prism and an inner camera at the inner side inspection station of the tab, the appearance defect detection of the inner side of the tab can be achieved collaboratively.

[0057] In some embodiments, the above-mentioned driving of the inner prism to move based on the inner driving instruction through the inner driving component can include: driving the inner connecting rod to move based on the inner driving instruction sent by the inner lower computer through the inner motor, and the inner motor is mechanically connected to the first end of the inner connecting rod; driving the inner prism to move through the inner connecting rod, and the second end of the inner connecting rod is mechanically connected to the inner prism.

[0058] In this way, the inner prism can be moved quickly and accurately according to the inner displacement through the inner motor and the inner connecting rod.

[0059] In some embodiments, the second end of the inner connecting rod is also mechanically connected to the inner camera, and the method may further include: driving the inner camera to move via the inner connecting rod.

[0060] In this way, by mechanically connecting the second end of the inner connecting rod to the inner camera, the relative position between the inner camera and the inner prism can be ensured to remain unchanged, thereby avoiding the inner camera being unable to capture the image of the inner side of the tab in the inner prism due to the movement of the inner prism in the width direction.

[0061] In some embodiments, the inner camera is provided with an inner liquid lens, and the method may further include: sending a plurality of inner voltage signals to the inner liquid lens through the inner lower computer; changing the focal length of the inner liquid lens based on each inner voltage signal; responding to the tab inner image acquisition instruction through the inner camera, acquiring the imaging in the inner prism after each zoom of the inner liquid lens, obtaining a plurality of tab inner images, and sending the plurality of tab inner images to the upper computer; the above-mentioned detection of appearance defects of the inner side of the tab based on the tab inner images by the upper computer to obtain the tab inner detection result may include: fusing the plurality of tab inner images into a target tab inner image through the upper computer, and performing appearance defect detection on the inner side of the tab based on the target tab inner image to obtain the tab inner detection result.

[0062] In this way, the inner liquid lens can be zoomed to capture multiple images of the inner side of the tab with different focal lengths, which are fused into a clearer target inner side image. Based on the clearer target inner side image, the inner side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0063] In some embodiments, before sending multiple inner voltage signals to the inner liquid lens through the inner lower computer as mentioned above, the method may also include: determining the pole lug width based on the pole lug image through the upper computer, determining the reference pole lug width based on the reference pole lug image, determining the pole lug width difference based on the pole lug width and the reference pole lug width, determining the required number of pole lug inner images according to the pole lug width difference and the preset voltage change, generating multiple inner voltage signals according to the initial voltage, the preset voltage change and the required number of pole lug inner images, and sending the multiple inner voltage signals to the inner lower computer.

[0064] In this way, the multiple inner voltage signals generated based on the above process can more reasonably control the focal length of the inner liquid lens, so that the multiple tab inner images obtained can be fused into a target tab inner image with higher overall clarity.

[0065] In some embodiments, the above-mentioned method of collecting the tab image of the battery cell assembly through the tab position detection station when the battery cell assembly arrives at the tab position detection station, and determining the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab of the battery cell assembly based on the tab image can include: collecting the tab image of the battery cell assembly through a position detection camera when the battery cell assembly arrives at the tab position detection station, and sending the tab image to the host computer; determining the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab of the battery cell assembly based on the tab image by the host computer.

[0066] In this way, the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0067] In some embodiments, the above-mentioned method of collecting a reference tab image of a reference battery cell assembly through a tab position detection station when the reference battery cell assembly arrives at the tab position detection station, and determining the tab outer reference coordinates and tab inner reference coordinates of the reference battery cell assembly based on the reference tab image may include: collecting a reference tab image of the reference battery cell assembly through a position detection camera when the reference battery cell assembly arrives at the tab position detection station, and sending the reference tab image to a host computer; and determining the tab outer reference coordinates and tab inner reference coordinates of the reference battery cell assembly through the host computer based on the reference tab image.

[0068] In this way, the outer side reference coordinates and the inner side reference coordinates of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0069] On the third aspect, the present application provides a tab detection method, which may include: when the battery cell assembly arrives at the tab outer detection station, based on the actual coordinates of the tab outer side of the battery cell assembly and the reference coordinates of the tab outer side, determining the outer displacement of the outer prism in the width direction; sending the outer displacement to the outer lower computer so that the outer lower computer controls the outer prism to move according to the outer displacement, so as to image the outer side of the tab of the battery cell assembly through the outer prism; receiving the tab outer side image sent by the outer camera, the tab outer side image is obtained by the outer camera capturing the image in the outer prism; and performing appearance defect detection on the tab outer side based on the tab outer side image. Detection is performed to obtain the detection result of the outer side of the tab; when the battery cell assembly arrives at the detection station of the inner side of the tab, the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab; the inner displacement is sent to the inner lower computer, so that the inner lower computer controls the inner prism to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism; the inner side image of the tab is received from the inner camera, and the inner side image of the tab is obtained by the inner camera capturing the image in the inner prism; the inner side of the tab is inspected for appearance defects based on the inner side image of the tab to obtain the detection result of the inner side of the tab.

[0070] Thus, when the battery cell assembly arrives at the outer side inspection station of the tab, the outer side displacement of the outer prism in the width direction can be determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab, and the outer side displacement can be sent to the outer side lower computer so that the outer side lower computer controls the outer side prism to move according to the outer side displacement, so as to image the outer side of the tab of the battery cell assembly through the outer side prism, receive the outer side image of the tab sent by the outer camera, the outer side image of the tab is obtained by the outer camera capturing the image in the outer prism, and then the outer side of the tab is inspected for appearance defects based on the outer side image of the tab to obtain the outer side inspection result of the tab; and When arriving at the inner side inspection station of the tab, the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab, and the inner displacement is sent to the inner lower computer so that the inner lower computer controls the inner prism to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism, and receive the inner side image of the tab sent by the inner camera. The inner side image of the tab is obtained by the inner camera capturing the image in the inner prism, and then the inner side of the tab is inspected for appearance defects based on the inner side image of the tab to obtain the inner side inspection result of the tab, thereby realizing the detection of appearance defects of the tab. In addition, the outer displacement of the outer prism in the width direction is determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. The position of the outer prism can be dynamically adjusted according to the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, thereby avoiding the situation where the outer prism can only be extended to a fixed position when the tab is misplaced, causing the outer prism to hit the outer side of the tab, thereby causing a safety hazard. Similarly, the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab. The position of the inner prism can be dynamically adjusted according to the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab, thereby avoiding the situation where the inner prism can only be extended to a fixed position when the tab is misplaced, causing the inner prism to hit the inner side of the tab, thereby causing a safety hazard.

[0071] In some embodiments, the above-mentioned determination of the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the pole lug of the battery cell assembly and the reference coordinates of the outer side of the pole lug may include: determining the amount of misalignment of the outer side of the pole lug of the battery cell assembly based on the actual coordinates of the outer side of the pole lug and the reference coordinates of the outer side of the pole lug; determining the outer displacement of the outer prism in the width direction based on the amount of misalignment of the outer side of the pole lug; the above-mentioned determination of the inner displacement of the inner prism in the width direction based on the actual coordinates of the inner side of the pole lug of the battery cell assembly and the reference coordinates of the inner side of the pole lug may include: determining the amount of misalignment of the inner side of the pole lug of the battery cell assembly based on the actual coordinates of the inner side of the pole lug and the reference coordinates of the inner side of the pole lug; determining the inner displacement of the inner prism in the width direction based on the amount of misalignment of the inner side of the pole lug.

[0072] In this way, by using the outer misalignment of the tab as the outer displacement of the outer prism, the relative position of the outer tab and the outer prism can be guaranteed to remain unchanged, preventing the tab misalignment from causing the outer tab and the outer prism to come too close together, or even to contact, causing damage to the tab. Similarly, by using the inner misalignment of the tab as the inner displacement of the inner prism, the relative position of the inner tab and the inner prism can be guaranteed to remain unchanged, preventing the tab misalignment from causing the inner tab and the inner prism to come too close together, or even to contact, causing damage to the tab.

[0073] In some embodiments, the above-mentioned determination of the outer displacement of the outer prism in the width direction based on the outer misalignment of the tab may include: obtaining the outer prism reference coordinates of the outer prism in the width direction; determining the outer displacement of the outer prism in the width direction based on the outer misalignment of the tab and the outer prism reference coordinates; the above-mentioned determination of the inner displacement of the inner prism in the width direction based on the inner misalignment of the tab may include: obtaining the inner prism reference coordinates of the inner prism in the width direction; determining the inner displacement of the inner prism in the width direction based on the inner misalignment of the tab and the inner prism reference coordinates.

[0074] In this way, the outer displacement of the outer prism can be accurately determined based on the outer misalignment of the tab and the reference coordinates of the outer prism, and the inner displacement of the inner prism can be accurately determined based on the inner misalignment of the tab and the reference coordinates of the inner prism.

[0075] In some embodiments, the above-mentioned acquisition of the outer prism reference coordinates of the outer prism in the width direction may include: determining the outer prism reference coordinates based on the outer reference coordinates of the tab and a preset distance; the above-mentioned acquisition of the inner prism reference coordinates of the inner prism in the width direction may include: determining the inner prism reference coordinates based on the inner reference coordinates of the tab and a preset distance.

[0076] In this way, by determining the outer prism reference coordinates based on the tab outer reference coordinates and the preset distance, it is possible to always ensure that the distance between the outer prism and the outer side of the tab is the preset distance, ensuring that the relative position of the outer prism and the tab remains unchanged, thereby ensuring that the position of the tab in the collected tab outer image is relatively fixed, ensuring imaging consistency. By determining the inner prism reference coordinates based on the tab inner reference coordinates and the preset distance, it is possible to always ensure that the distance between the inner prism and the inner side of the tab is the preset distance, ensuring that the relative position of the inner prism and the tab remains unchanged, thereby ensuring that the position of the tab in the collected tab inner image is relatively fixed, ensuring imaging consistency.

[0077] In some embodiments, the above-mentioned appearance defect detection on the outside of the tab based on the outside image of the tab to obtain the outside detection result of the tab may include: fusing multiple outside images of the tab into a target outside image of the tab; performing appearance defect detection on the outside of the tab based on the target outside image of the tab to obtain the outside detection result of the tab; the above-mentioned appearance defect detection on the inside of the tab based on the inside image of the tab to obtain the inside detection result of the tab may include: fusing multiple inside images of the tab into a target inside image of the tab; performing appearance defect detection on the inside of the tab based on the target inside image of the tab to obtain the inside detection result of the tab.

[0078] In this way, the appearance defects of the outside of the tab can be detected based on the clearer target outside of the tab image obtained by fusing multiple outside of the tab images, and the appearance defects of the inside of the tab can be detected based on the clearer target inside of the tab image obtained by fusing multiple inside of the tab images, thereby improving the accuracy of detection.

[0079] In some embodiments, the method may further include: receiving a tab image of the battery cell assembly sent by a position detection camera; and determining actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image.

[0080] In this way, the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0081] In some embodiments, the above-mentioned determination of the actual coordinates of the outer side of the pole tab and the actual coordinates of the inner side of the pole tab of the battery cell assembly based on the pole tab image may include: determining the outer side pixel coordinates and the inner side pixel coordinates of the outer side of the pole tab in the pole tab image; converting the outer side pixel coordinates of the pole tab to the coordinate system corresponding to the outer driving component of the outer prism to obtain the actual coordinates of the outer side of the pole tab, and converting the inner side pixel coordinates of the pole tab to the coordinate system corresponding to the inner driving component of the inner prism to obtain the actual coordinates of the inner side of the pole tab.

[0082] In this way, by converting the outer pixel coordinates of the outer side of the tab in the tab image into the coordinate system corresponding to the outer drive assembly, the actual coordinates of the outer side of the tab are obtained, and then the outer displacement is determined based on the actual coordinates of the outer side of the tab. This allows the outer drive assembly to move the outer prism directly based on the outer displacement without the need to perform coordinate conversion on the outer displacement, which is simple and efficient. By converting the inner pixel coordinates of the inner side of the tab in the tab image into the coordinate system corresponding to the inner drive assembly, the actual coordinates of the inner side of the tab are obtained, and then the inner displacement is determined based on the actual coordinates of the inner side of the tab. This allows the inner drive assembly to move the inner prism directly based on the inner displacement without the need to perform coordinate conversion on the inner displacement, which is simple and efficient. Moreover, when cutting and pulling the mold, there is no need to reconfirm the reference position, which improves the efficiency of cutting and pulling the mold.

[0083] In some embodiments, the method may further include: receiving a reference tab image of a reference battery cell assembly sent by a position detection camera; and determining a tab outer side reference coordinate and a tab inner side reference coordinate of the reference battery cell assembly based on the reference tab image.

[0084] In this way, the outer side reference coordinates and the inner side reference coordinates of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0085] In some embodiments, the above-mentioned determination of the outer side reference coordinates and the inner side reference coordinates of the reference battery cell assembly based on the reference battery cell image may include: determining the outer side reference pixel coordinates and the inner side reference pixel coordinates of the reference battery cell assembly's reference battery cell assembly in the reference battery cell image; converting the outer side reference pixel coordinates of the battery cell assembly into the coordinate system corresponding to the outer side drive component of the outer prism to obtain the outer side reference coordinates of the battery cell assembly, and converting the inner side reference pixel coordinates of the battery cell assembly into the coordinate system corresponding to the inner side drive component of the inner prism to obtain the inner side reference coordinates of the battery cell assembly.

[0086] In this way, by converting the outer side reference pixel coordinates of the reference tab in the reference tab image to the coordinate system corresponding to the outer drive assembly, the outer side reference coordinates of the tab are obtained, and then the outer side displacement is determined based on the outer side reference coordinates. This allows the outer drive assembly to directly move the outer prism based on the outer side displacement without the need to perform coordinate conversion on the outer side displacement, which is simple and efficient. By converting the inner side reference pixel coordinates of the reference tab in the reference tab image to the coordinate system corresponding to the inner drive assembly, the inner side reference coordinates of the tab are obtained, and then the inner side displacement is determined based on the inner side reference coordinates. This allows the inner drive assembly to directly move the inner prism based on the inner side displacement without the need to perform coordinate conversion on the inner side displacement, which is simple and efficient. Moreover, when cutting and pulling the mold, there is no need to reconfirm the reference position, which improves the efficiency of cutting and pulling the mold.

[0087] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0089] FIG1 is a schematic diagram of a tab detection system according to some embodiments of the present application;

[0090] FIG2 is a schematic diagram of an image of the outer side of a tab provided in some embodiments of the present application;

[0091] FIG3 is a schematic structural diagram of an inner drive assembly provided in some embodiments of the present application;

[0092] FIG4 is a second schematic diagram of a tab detection system provided by some embodiments of the present application;

[0093] FIG5 is a schematic diagram of a battery cell assembly provided in some embodiments of the present application;

[0094] FIG6 is a flow chart of a tab detection method according to some embodiments of the present application;

[0095] FIG7 is a second flowchart of a tab detection method provided by some embodiments of the present application;

[0096] FIG8 is a schematic diagram of a reference battery cell assembly provided in some embodiments of the present application.

[0097] In the accompanying drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0098] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0099] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0100] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0101] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0102] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0103] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0104] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0105] As mentioned in the background, during battery production, the cathode, anode, and separator are wound together to form a bare cell. This process can produce bare cells with appearance defects such as folded, misaligned, missing, or cracked tabs. These defects can have a significant impact on battery safety. Therefore, a solution is needed to detect these tab appearance defects.

[0106] In related technology, the tabs of bare cells can be inspected for defects during the assembly phase. Specifically, a positioning camera can be used to capture the overall dimensions of the tabs with backlighting. If the tab misalignment is within control standards, subsequent inspection can proceed. After the cell arrives at the inspection station, a prism is controlled to extend to a fixed position determined by the estimated maximum tab misalignment. The prism then folds the side view of the tab 90° back to the camera for image capture.

[0107] However, the estimated maximum value of the tab misalignment is not necessarily accurate. Therefore, when the tab misalignment is large, the prism may touch the tab when extended to the fixed position, causing damage to the tab. Especially when inspecting the inside of the tab, since the distance between the two tabs is usually small, when the prism is extended between the two tabs, a slight deviation in position will cause it to touch the tab, which can easily cause damage to the tab and pose a safety hazard to the product.

[0108] In response to the above technical problems, the present application provides a tab inspection system and method. When a battery cell assembly reaches the tab outer inspection station, the outer prism can be controlled to move according to the outer displacement, so as to image the outer side of the tab of the battery cell assembly through the outer prism, and the image captured by the outer prism is obtained to obtain the outer side image of the tab. When the battery cell assembly reaches the tab inner inspection station, the inner prism can be controlled to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism, and the image captured by the inner prism is obtained to obtain the inner side image of the tab. The outer side image of the tab can be used to determine the outer side inspection result of the tab, and the inner side image of the tab can be used to determine the inner side inspection result of the tab, thereby realizing the detection of tab appearance defects. In addition, the above-mentioned outer displacement is the displacement of the outer prism in the width direction determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. That is to say, the position of the outer prism can be dynamically adjusted according to the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab to avoid the situation where the tab is misplaced and the outer prism can only be extended to a fixed position, causing the outer prism to hit the outside of the tab, thereby causing a safety hazard; similarly, the above-mentioned inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab. The position of the inner prism can be dynamically adjusted according to the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab to avoid the situation where the tab is misplaced and the inner prism can only be extended to a fixed position, causing the inner prism to hit the inside of the tab, thereby causing a safety hazard.

[0109] The tab detection system and method provided in the embodiments of the present application are introduced in detail below.

[0110] FIG1 is a schematic diagram of a tab detection system provided in some embodiments of the present application.

[0111] As shown in FIG. 1 , the tab inspection system 100 may include at least one tab outer side inspection station 110 and at least one tab inner side inspection station 120 .

[0112] Among them, at least one tab outer side detection station 110 can be used to control the outer prism 111 to move according to the outer displacement when the battery cell assembly reaches the tab outer side detection station 110, so as to image the outer side of the tab of the battery cell assembly through the outer prism 111, collect the image in the outer prism 111, and obtain the tab outer side image.

[0113] The tab outer side image can be used to determine the tab outer side inspection result. The tab outer side inspection result can indicate whether there are any appearance defects on the tab outer side.

[0114] The outer displacement can be the displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. The actual coordinates of the outer side of the tab can be the coordinates of the outer side of the tab of the battery cell assembly actually collected, and the reference coordinates of the outer side of the tab can be the theoretical coordinates of the outer side of the tab when no tab misalignment occurs.

[0115] After the outer prism 111 moves along the width direction according to the outer displacement and then moves along the height direction according to the preset displacement, it can reach a suitable position, so as to image the outer side of the tab without touching the tab.

[0116] At the tab outer side inspection station 110 , the outer side of the tab of the battery cell assembly can be inspected for appearance defects.

[0117] At least one tab inner side detection station 120 can be used to control the inner prism 121 to move according to the inner displacement when the battery cell assembly reaches the tab inner side detection station 120, so as to image the inner side of the tab of the battery cell assembly through the inner prism 121, collect the image in the inner prism 121, and obtain the tab inner side image.

[0118] The inner tab image can be used to determine the inner tab inspection result. The inner tab inspection result can indicate whether there are any appearance defects on the inner tab.

[0119] The inner displacement can be the displacement of the inner prism in the width direction based on the actual inner tab coordinates of the battery cell assembly and the inner tab reference coordinates. The actual inner tab coordinates can be the actual coordinates of the inner tab of the battery cell assembly, and the inner tab reference coordinates can be the theoretical coordinates of the inner tab when no tab misalignment occurs.

[0120] After the inner prism 121 moves along the width direction according to the inner displacement and then moves along the height direction according to the preset displacement, it can reach a suitable position, so as to image the inner side of the tab without touching the tab.

[0121] At the tab inner side inspection station 110 , the inner side of the tab of the battery cell assembly can be inspected for appearance defects.

[0122] The battery cell assembly can be a bare battery cell. The battery cell assembly can include multiple tabs. As shown in Figure 1, the battery cell assembly can include two tabs. When the two tabs are arranged side by side, the side opposite the two tabs is the tab inner side, and the side opposite the tab inner side is the tab outer side. The two tabs can be a cathode tab and an anode tab.

[0123] Thus, when the battery cell assembly reaches the outer tab inspection station, the outer prism can be controlled to move according to the outer displacement to image the outer side of the battery cell assembly's tab through the outer prism, and the image captured by the outer prism is obtained to obtain an image of the outer side of the tab; when the battery cell assembly reaches the inner tab inspection station, the inner prism can be controlled to move according to the inner displacement to image the inner side of the battery cell assembly's tab through the inner prism, and the image captured by the inner prism is obtained to obtain an image of the inner side of the tab. The outer side of the tab image can be used to determine the outer side of the tab inspection result, and the inner side of the tab image can be used to determine the inner side of the tab inspection result, thereby enabling the detection of tab appearance defects. In addition, the above-mentioned outer displacement is the displacement of the outer prism in the width direction determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. That is to say, the position of the outer prism can be dynamically adjusted according to the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab to avoid the situation where the tab is misplaced and the outer prism can only be extended to a fixed position, causing the outer prism to hit the outside of the tab, thereby causing a safety hazard; similarly, the above-mentioned inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab. The position of the inner prism can be dynamically adjusted according to the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab to avoid the situation where the tab is misplaced and the inner prism can only be extended to a fixed position, causing the inner prism to hit the inside of the tab, thereby causing a safety hazard.

[0124] In some embodiments of the present application, the tab detection system may further include: a host computer.

[0125] The host computer can be used to determine the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, and to determine the inner displacement of the inner prism in the width direction based on the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab.

[0126] At least one tab outer side inspection station and at least one tab inner side inspection station may share a host computer.

[0127] In this way, the data can be processed by the host computer to accurately determine the outer displacement of the outer prism and the inner displacement of the inner prism.

[0128] In some embodiments of the present application, as shown in FIG1 , the tab outer side detection station 110 may include: an outer lower machine (not shown in FIG1 ), an outer drive assembly (not shown in FIG1 ), an outer prism 111 and an outer camera 112 .

[0129] The outer lower computer can be electrically connected to the upper computer, the outer drive assembly, and the outer camera 112. The outer lower computer can be used to receive the outer displacement sent by the upper computer, generate an outer drive instruction based on the outer displacement, send the outer drive instruction to the outer drive assembly, and send an image acquisition instruction of the outer side of the tab to the outer camera 112.

[0130] The external lower computer may be a programmable logic controller (PLC).

[0131] The outer drive assembly can be mechanically connected to the outer prism 111. The outer drive assembly can be used to drive the outer prism 111 to move based on the outer drive instruction. The outer drive instruction can be used to trigger the outer drive assembly to drive the outer prism 111 to move according to the outer displacement.

[0132] The outer prism 111 can be used to image the outer side of the tab.

[0133] The external camera 112 can be electrically connected to the host computer. The external prism 111 and the external camera 112 can be integrated in structure.

[0134] The external camera 112 can be used to respond to the external tab image acquisition instruction to capture the image in the external prism 111, obtain the external tab image, and send the external tab image to the host computer. The external tab image acquisition instruction can be used to trigger the external camera 112 to capture the image of the external tab in the external prism 111.

[0135] The host computer can also be used to perform appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab.

[0136] For example, the image of the outer side of the tab may be as shown in FIG2 .

[0137] Specifically, the host computer sends the outer displacement to the outer lower computer, and the lower computer generates an outer drive instruction based on the outer displacement, sends the outer drive instruction to the outer drive component, and sends the outer side image acquisition instruction of the tab to the outer camera 112. The outer drive component drives the outer prism 111 to move according to the outer displacement based on the outer drive instruction, and then the outer prism can image the outer side of the tab. The outer camera 112 can respond to the outer side image acquisition instruction of the tab to capture the image of the outer side of the tab in the outer prism 111, obtain the outer side image of the tab, and send the outer side image of the tab to the host computer. Then, the host computer can perform appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab.

[0138] In this way, by setting an outer lower computer, an outer drive assembly, an outer prism and an outer camera at the outer side inspection station of the tab, the appearance defect detection of the outer side of the tab can be achieved collaboratively.

[0139] In some embodiments of the present application, the outer drive assembly may include: an outer motor and an outer connecting rod.

[0140] The outer motor can be electrically connected to the outer lower computer and mechanically connected to the first end of the outer connecting rod. The outer motor can be used to drive the outer connecting rod to move based on an outer drive instruction sent by the outer lower computer. The outer drive instruction can be used to trigger the outer motor to drive the outer connecting rod to move.

[0141] The outer motor can be a servo motor with an absolute encoder.

[0142] The second end of the outer connecting rod can be mechanically connected to the outer prism. The outer connecting rod can be used to drive the outer prism to move. The outer connecting rod can drive the outer prism to move in the width direction.

[0143] The outer connecting rod can be a screw rod.

[0144] Specifically, the outer lower computer sends an outer driving instruction to the outer motor, and the outer motor drives the outer connecting rod to move based on the outer driving instruction, and the outer connecting rod drives the outer prism to move according to the outer displacement.

[0145] In this way, the outer prism can be moved quickly and accurately according to the outer displacement through the outer motor and the outer connecting rod.

[0146] In addition, the tab outer side inspection station may further include another outer side drive assembly (hereinafter referred to as a "first outer side drive assembly"), which may be electrically connected to the outer side lower motor and mechanically connected to the outer side prism, and is configured to drive the outer side prism to move based on a first outer side drive instruction. The first outer side drive instruction may be generated based on a preset displacement that the outer side prism needs to move in the height direction.

[0147] The first outer drive assembly may include a first outer motor and a first outer connecting rod. The first outer motor may be electrically connected to the outer lower computer and mechanically connected to the first end of the first outer connecting rod. The first outer motor may be used to drive the first outer connecting rod to move based on a first outer drive instruction sent by the outer lower computer.

[0148] The second end of the first outer connecting rod can be mechanically connected to the outer prism. The first outer connecting rod can be used to drive the outer prism to move. The first outer connecting rod can drive the outer prism to move in the height direction.

[0149] Specifically, the outer lower computer sends an outer drive instruction to the outer motor and sends a first outer drive instruction to the first outer motor. The outer motor first drives the outer connecting rod to move based on the outer drive instruction, and the outer connecting rod drives the outer prism to move in the width direction according to the outer displacement. Then, the first outer motor drives the first outer connecting rod to move based on the first outer drive instruction, and the first outer connecting rod drives the outer prism to move in the height direction according to the preset displacement.

[0150] In this way, by controlling the outer prism to move in the width direction and the height direction through the above process, the outer prism can be accurately moved to an appropriate position so that the outer prism can image the outer side of the tab.

[0151] In some embodiments of the present application, the second end of the outer connecting rod may also be mechanically connected to the outer camera, and the outer connecting rod may also be used to drive the outer camera to move.

[0152] In order to ensure that the outer camera can capture the image of the outer side of the outer ear in the outer prism, it is necessary to ensure that the distance between the outer camera and the outer prism is appropriate. The initial relative position of the outer camera and the outer prism can be set in advance. However, since the outer prism will move in the width direction, in order to ensure that the relative position between the outer camera and the outer prism remains unchanged, the second end of the outer connecting rod can be mechanically connected to the outer camera. In this way, when the outer connecting rod moves, it can drive the outer camera and the outer prism to move synchronously, thereby ensuring that the relative position between the outer camera and the outer prism remains unchanged.

[0153] In this way, by mechanically connecting the second end of the outer connecting rod to the outer camera, the relative position between the outer camera and the outer prism can be ensured to remain unchanged, thereby avoiding the outer camera being unable to capture the image of the outside of the outer ear in the outer prism due to the movement of the outer prism in the width direction.

[0154] In some embodiments of the present application, the external camera may be provided with an external liquid lens, and the external liquid lens may be electrically connected to the external lower machine.

[0155] The focal length of the outer liquid lens may be related to the voltage input to the outer liquid lens. The greater the voltage input to the outer liquid lens, the closer the focal length of the outer liquid lens. In other words, the focal length of the outer liquid lens may be negatively correlated with the voltage input to the outer liquid lens.

[0156] The external slave computer can also be used to send multiple external voltage signals to the external liquid lens. The voltage values ​​of the multiple external voltage signals can be different.

[0157] The outer liquid lens can be used to change its focal length based on each outer voltage signal.

[0158] The external camera can also be used to respond to the tab outer image acquisition instruction, capture the image in the external prism after each zoom of the external liquid lens, obtain multiple tab outer images, and send the multiple tab outer images to the host computer.

[0159] The host computer can also be used to fuse multiple tab outer side images into a target tab outer side image, and perform appearance defect detection on the tab outer side based on the target tab outer side image to obtain a tab outer side detection result.

[0160] The focal lengths of the multiple tab outer side images may be different, and the focal lengths of the multiple tab outer side images may correspond one-to-one to the multiple outer side voltage signals.

[0161] The clarity of different image areas in multiple images of the outer side of the tab with different focal lengths may be different. The host computer may fuse multiple incompletely clear images of the outer side of the tab into a target outer side image of the tab with each area being clear.

[0162] Specifically, the outer lower computer sends multiple outer voltage signals to the outer liquid lens, and the outer liquid lens changes its focal length based on each outer voltage signal. The outer camera responds to the image acquisition instruction of the outer side of the tab, and after each zoom of the outer liquid lens, it captures the image in the outer prism to obtain multiple outer side images of the tab, and sends the multiple outer side images of the tab to the upper computer. The upper computer fuses the multiple outer side images of the tab into a target outer side image of the tab, and performs appearance defect detection on the outer side of the tab based on the target outer side image of the tab to obtain the outer side detection result of the tab.

[0163] In this way, the outer liquid lens can be zoomed to capture multiple images of the outer side of the tab with different focal lengths, which can be fused into a clearer target outer side image. Based on the clearer target outer side image, the outer side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0164] The outer drive assembly has the same structure as the inner drive assembly described below, which can be understood with reference to Figure 3. The first outer drive assembly has the same structure as the first inner drive assembly described below, which can be understood with reference to Figure 3.

[0165] In some embodiments of the present application, as shown in FIG1 , the tab inner side detection station 120 may include: an inner side lower machine (not shown in FIG1 ), an inner side drive assembly (not shown in FIG1 ), an inner side prism 121 and an inner side camera 122 .

[0166] The inner lower computer can be electrically connected to the upper computer, the inner drive assembly, and the inner camera 122. The inner lower computer can be used to receive the inner displacement sent by the upper computer, generate an inner drive instruction based on the inner displacement, send the inner drive instruction to the inner drive assembly, and send an inner tab image acquisition instruction to the inner camera 122.

[0167] The inner lower computer can be a PLC.

[0168] The inner drive assembly can be mechanically connected to the inner prism 121. The inner drive assembly can be used to drive the inner prism 121 to move based on the inner drive instruction. The inner drive instruction can be used to trigger the inner drive assembly to drive the inner prism 121 to move according to the inner displacement.

[0169] The inner prism 121 can be used to image the inner side of the tab.

[0170] The inner camera 122 can be electrically connected to the host computer. The inner prism 121 and the inner camera 122 can be integrated in structure.

[0171] The inner camera 122 can be used to respond to the tab inner image acquisition instruction to capture the image in the inner prism 121, obtain the tab inner image, and send the tab inner image to the host computer. The tab inner image acquisition instruction can be used to trigger the inner camera 122 to capture the image of the inner side of the tab in the inner prism 121.

[0172] The host computer can also be used to perform appearance defect detection on the inside of the tab based on the inside image of the tab to obtain the inside detection result of the tab.

[0173] Specifically, the host computer sends the inner displacement to the inner lower computer, and the lower computer generates an inner drive instruction based on the inner displacement, sends the inner drive instruction to the inner drive component, and sends the inner tab image acquisition instruction to the inner camera 122. The inner drive component drives the inner prism 121 to move according to the inner displacement based on the inner drive instruction, and then the inner prism can image the inner side of the tab. The inner camera 122 can respond to the inner tab image acquisition instruction to capture the image of the inner side of the tab in the inner prism 121, obtain the inner tab image, and send the inner tab image to the host computer. Then, the host computer can perform appearance defect detection on the inner side of the tab based on the inner tab image to obtain the inner tab detection result.

[0174] In this way, by setting up an inner lower machine, an inner drive assembly, an inner prism and an inner camera at the inner side inspection station of the tab, the appearance defect detection of the inner side of the tab can be achieved collaboratively.

[0175] In some embodiments of the present application, as shown in FIG. 3 , the inner driving assembly may include: an inner motor 1231 and an inner connecting rod 1232 .

[0176] The inner motor 1231 can be electrically connected to the inner lower computer and mechanically connected to the first end of the inner connecting rod 1232. The inner motor 1231 can be used to drive the inner connecting rod 1232 to move based on the inner drive command sent by the inner lower computer. The inner drive command can be used to trigger the inner motor to drive the inner connecting rod to move.

[0177] The inner motor 1231 may be a servo motor with an absolute encoder.

[0178] The second end of the inner connecting rod 1232 can be mechanically connected to the inner prism 121. The inner connecting rod 1232 can be used to drive the inner prism 121 to move.

[0179] The inner connecting rod 1232 may be a screw rod.

[0180] Specifically, the inner lower computer sends an inner driving instruction to the inner motor 1231 , and the inner motor drives the inner connecting rod 1232 to move based on the outer driving instruction, and the inner connecting rod 1232 drives the inner prism 121 to move according to the inner displacement.

[0181] In this way, the inner prism can be moved quickly and accurately according to the inner displacement through the inner motor and the inner connecting rod.

[0182] In addition, the tab inner side inspection station may further include another inner side drive assembly (hereinafter referred to as a "first inner side drive assembly"), which may be electrically connected to the inner side lower motor and mechanically connected to the inner side prism, and is configured to drive the inner side prism to move based on a first inner side drive instruction. The first inner side drive instruction may be generated based on a preset displacement of the inner side prism in the height direction.

[0183] As shown in FIG3 , the first inner drive assembly may include a first inner motor 1233 and a first inner connecting rod 1234. The first inner motor 1233 may be electrically connected to the inner lower computer and mechanically connected to a first end of the first inner connecting rod 1234. The first inner motor 1233 may be configured to drive the first inner connecting rod 1234 to move based on a first inner drive instruction sent by the inner lower computer.

[0184] The second end of the first inner connecting rod 1234 can be mechanically connected to the inner prism 121. The first inner connecting rod 1234 can be used to drive the inner prism 121 to move. The first inner connecting rod 1234 can drive the inner prism 121 to move in the height direction.

[0185] Specifically, the inner lower computer sends an inner drive instruction to the inner motor 1231 and sends a first inner drive instruction to the first inner motor 1233. The inner motor 1231 first drives the inner connecting rod 1232 to move based on the inner drive instruction, and the inner connecting rod 1232 drives the inner prism 121 to move in the width direction according to the inner displacement. Then, the first inner motor 1233 drives the first inner connecting rod 1234 to move based on the first inner drive instruction, and the first inner connecting rod 1234 drives the inner prism 121 to move in the height direction according to the preset displacement.

[0186] In this way, by controlling the movement of the inner prism in the width direction and the height direction through the above process, the inner prism can be accurately moved to an appropriate position so that the inner prism can image the inner side of the tab.

[0187] In some embodiments of the present application, as shown in FIG3 , the second end of the inner connecting rod 1232 may also be mechanically connected to the inner camera 122. The inner connecting rod 1232 may also be used to drive the inner camera 122 to move.

[0188] In order to ensure that the inner camera 122 can capture the image of the outer side of the inner prism 121, it is necessary to ensure that the distance between the inner camera 122 and the inner prism 121 is appropriate. The initial relative position of the inner camera 122 and the inner prism 121 can be set in advance. However, since the inner prism 121 will move in the width direction, in order to ensure that the relative position between the inner camera 122 and the inner prism 121 remains unchanged, the second end of the inner connecting rod 1232 can be mechanically connected to the inner camera 122. In this way, when the inner connecting rod 1232 moves, it can drive the inner camera 122 and the inner prism 121 to move synchronously, thereby ensuring that the relative position between the inner camera 122 and the inner prism 121 remains unchanged.

[0189] In this way, by mechanically connecting the second end of the inner connecting rod to the inner camera, the relative position between the inner camera and the inner prism can be ensured to remain unchanged, thereby avoiding the inner camera being unable to capture the image of the inner side of the tab in the inner prism due to the movement of the inner prism in the width direction.

[0190] In some embodiments of the present application, the inner camera may be provided with an inner liquid lens, and the inner liquid lens may be electrically connected to the inner lower machine.

[0191] The focal length of the inner liquid lens may be related to the voltage input to the inner liquid lens. The greater the voltage input to the inner liquid lens, the closer the focal length of the inner liquid lens. In other words, the focal length of the inner liquid lens may be negatively correlated with the voltage input to the inner liquid lens.

[0192] The inner lower computer can also be used to send multiple inner voltage signals to the inner liquid lens. The voltage values ​​of the multiple inner voltage signals can be different.

[0193] The inner liquid lens can be used to change its focal length based on each inner voltage signal.

[0194] The inner camera can also be used to respond to the tab inner image acquisition instruction, and after each zoom of the inner liquid lens, it captures the image in the inner prism to obtain multiple tab inner images, and sends the multiple tab inner images to the host computer.

[0195] The host computer can also be used to fuse multiple tab inner side images into a target tab inner side image, and perform appearance defect detection on the tab inner side based on the target tab inner side image to obtain a tab inner side detection result.

[0196] The focal lengths of the multiple tab inner side images may be different, and the focal lengths of the multiple tab inner side images may correspond one-to-one to the multiple inner side voltage signals.

[0197] The clarity of different image areas in multiple tab inner side images with different focal lengths may be different. The host computer may fuse multiple incomplete tab inner side images into a target tab inner side image with all areas being clear.

[0198] Specifically, the inner lower computer sends multiple inner voltage signals to the inner liquid lens, and the inner liquid lens changes its focal length based on each inner voltage signal. The inner camera responds to the tab inner image acquisition instruction, and after each zoom of the inner liquid lens, it captures the image in the inner prism to obtain multiple tab inner images, and sends the multiple tab inner images to the upper computer. The upper computer fuses the multiple tab inner images into a target tab inner image, and performs appearance defect detection on the inside of the tab based on the target tab inner image to obtain the tab inner detection result.

[0199] In this way, the inner liquid lens can be zoomed to capture multiple images of the inner side of the tab with different focal lengths, which are fused into a clearer target inner side image. Based on the clearer target inner side image, the inner side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0200] In some embodiments of the present application, as shown in FIG. 4 , the tab detection system 100 may further include: a tab position detection station 130 .

[0201] The tab position detection station 130 may be located upstream of the at least one tab outside detection station 110 and the at least one tab inside detection station 130 .

[0202] The tab position detection station 130 can be used to collect the tab image of the battery cell assembly when the battery cell assembly arrives at the tab position detection station 130, and determine the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image.

[0203] The tab image may be an image including at least the tab of the battery cell assembly.

[0204] The actual coordinates of the outer side of the tab may be the coordinates of the outer corner point of the tab of the battery cell assembly, and the actual coordinates of the inner side of the tab may be the coordinates of the inner corner point of the tab of the battery cell assembly.

[0205] For example, the tab image may be as shown in FIG5 , the actual coordinates of the outer side of the tab may be the coordinates of the outer corner point 510 of the tab of the battery cell assembly, and the actual coordinates of the inner side of the tab may be the coordinates of the inner corner point 520 of the tab of the battery cell assembly.

[0206] The actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab may both be coordinates in the width direction.

[0207] In this way, the tab image can be collected through the tab position detection station to quickly and accurately determine the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab.

[0208] In some embodiments of the present application, the tab position detection station 130 may include: a position detection camera 131 .

[0209] The position detection camera 131 can be electrically connected to the host computer and can be used to capture the tab image of the battery cell assembly when the battery cell assembly arrives at the tab position detection station 130 and send the tab image to the host computer.

[0210] The position detection camera 131 may be a positioning camera and may be provided with a backlight source so that the position detection camera 131 can take pictures with backlight.

[0211] The host computer can also be used to determine the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image.

[0212] In this way, the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0213] In some embodiments of the present application, the tab position detection station 130 is also used to collect a reference tab image of the reference battery cell assembly when the reference battery cell assembly arrives at the tab position detection station 130, and determine the tab outer reference coordinates and tab inner reference coordinates of the reference battery cell assembly based on the reference tab image.

[0214] The reference cell assembly can be a perfect cell with almost no misalignment of the tabs. The reference cell assembly can be a bare cell of the same model as the cell assembly.

[0215] The tab outer side reference coordinates may be the coordinates of the tab outer side corner points of the reference cell assembly, and the tab inner side reference coordinates may be the coordinates of the tab inner side corner points of the reference cell assembly.

[0216] Both the tab outer side reference coordinate and the tab inner side reference coordinate may be coordinates in the width direction.

[0217] In this way, the reference tab image can be collected through the tab position detection station to quickly and accurately determine the reference coordinates of the outer side of the tab and the reference coordinates of the inner side of the tab.

[0218] In some embodiments of the present application, the position detection camera 131 may also be used to capture a reference tab image of the reference cell assembly when the reference cell assembly arrives at the tab position detection station 130, and send the reference tab image to the host computer;

[0219] The host computer can also be used to determine the outer side reference coordinates and the inner side reference coordinates of the tab of the reference battery cell assembly based on the reference tab image.

[0220] In this way, the outer side reference coordinates and the inner side reference coordinates of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0221] In some embodiments of the present application, at least one tab outer side inspection station may include two, and at least one tab inner side inspection station may include two.

[0222] As shown in FIG1 or FIG4 , the tab inspection system 100 may include two tab outer side inspection stations 110 and two tab inner side inspection stations 120, and may also include a tab position inspection station 130. For example, the order in which the battery cell assembly passes through the five stations may be from left to right as shown in FIG1 or FIG4 .

[0223] In this way, the tab appearance defect detection of the battery cell assembly can be achieved through one tab position detection station, two tab outer side detection stations and two tab inner side detection stations.

[0224] An embodiment of the present application further provides a tab detection method, which may be executed by a tab detection system. The tab detection method provided in the embodiment of the present application is introduced below.

[0225] FIG6 is a flow chart of a tab detection method provided in some embodiments of the present application.

[0226] As shown in FIG6 , the tab detection method may include the following steps:

[0227] S610, passing through at least one tab outer side inspection station, when the battery cell assembly arrives at the tab outer side inspection station, controlling the outer side prism to move according to the outer side displacement, so as to image the outer side of the tab of the battery cell assembly through the outer side prism, and collecting the image in the outer side prism to obtain an image of the tab outer side;

[0228] S620, through at least one tab inner side detection station, when the battery cell assembly reaches the tab inner side detection station, control the inner prism to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism, collect the image in the inner prism, and obtain the tab inner side image.

[0229] The outer tab image can be used to determine the outer tab detection result. The outer tab displacement can be the displacement of the outer prism in the width direction determined based on the actual coordinates of the outer tab of the battery cell assembly and the reference coordinates of the outer tab.

[0230] The inner tab image can be used to determine the inner tab inspection result. The inner side displacement can be the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner tab of the battery cell assembly and the inner tab reference coordinates.

[0231] The specific process of S610-S620 can be found in the above embodiment and will not be repeated here.

[0232] Thus, when the battery cell assembly reaches the outer tab inspection station, the outer prism can be controlled to move according to the outer displacement to image the outer side of the battery cell assembly's tab through the outer prism, and the image captured by the outer prism is obtained to obtain an image of the outer side of the tab; when the battery cell assembly reaches the inner tab inspection station, the inner prism can be controlled to move according to the inner displacement to image the inner side of the battery cell assembly's tab through the inner prism, and the image captured by the inner prism is obtained to obtain an image of the inner side of the tab. The outer side of the tab image can be used to determine the outer side of the tab inspection result, and the inner side of the tab image can be used to determine the inner side of the tab inspection result, thereby enabling the detection of tab appearance defects. In addition, the above-mentioned outer displacement is the displacement of the outer prism in the width direction determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. That is to say, the position of the outer prism can be dynamically adjusted according to the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab to avoid the situation where the tab is misplaced and the outer prism can only be extended to a fixed position, causing the outer prism to hit the outside of the tab, thereby causing a safety hazard; similarly, the above-mentioned inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab. The position of the inner prism can be dynamically adjusted according to the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab to avoid the situation where the tab is misplaced and the inner prism can only be extended to a fixed position, causing the inner prism to hit the inside of the tab, thereby causing a safety hazard.

[0233] In some embodiments of the present application, the method may further include:

[0234] The upper computer determines the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, and determines the inner displacement of the inner prism in the width direction based on the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab.

[0235] The specific process can be found in the above embodiment and will not be described again here.

[0236] In this way, the data can be processed by the host computer to accurately determine the outer displacement of the outer prism and the inner displacement of the inner prism.

[0237] In some embodiments of the present application, S610 may include:

[0238] Receive the outer displacement sent by the upper computer through the outer lower computer, generate an outer drive instruction based on the outer displacement, send the outer drive instruction to the outer drive component, and send the outer tab image acquisition instruction to the outer camera;

[0239] The outer prism is driven to move based on the outer driving instruction by the outer driving component;

[0240] The outer side of the tab is imaged through the outer prism;

[0241] By using the external camera, in response to the tab outer side image acquisition instruction, the image in the external prism is acquired to obtain the tab outer side image, and the tab outer side image is sent to the host computer;

[0242] Based on this, the method may further include:

[0243] The upper computer performs appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab.

[0244] The outer drive assembly may be mechanically connected to the outer prism.

[0245] The specific process can be found in the above embodiment and will not be described again here.

[0246] In this way, by setting an outer lower computer, an outer drive assembly, an outer prism and an outer camera at the outer side inspection station of the tab, the appearance defect detection of the outer side of the tab can be achieved collaboratively.

[0247] In some embodiments of the present application, the above-mentioned receiving the outer displacement sent by the upper computer through the outer lower computer, generating the outer drive instruction based on the outer displacement, and sending the outer drive instruction to the outer drive component may include:

[0248] The outer displacement sent by the upper computer is received through the outer lower computer. When the outer displacement does not exceed the preset range, an outer drive instruction is generated based on the outer displacement and the outer drive instruction is sent to the outer drive component.

[0249] Here, the outer lower computer can determine whether the outer displacement exceeds the preset range. If the outer displacement does not exceed the preset range, the outer prism can be moved according to the outer displacement; if the outer displacement exceeds the preset range, the outer prism cannot be moved according to the outer displacement.

[0250] The preset range can be set according to actual needs.

[0251] In this way, by sending an outer drive instruction to the outer drive component based on the outer displacement only when the outer displacement does not exceed the preset range, it is possible to avoid the outer prism being moved to the wrong position due to inaccurate outer displacement, thereby preventing safety hazards.

[0252] In some embodiments of the present application, the outer prism is driven to move based on the outer drive instruction by the outer drive assembly, which may include:

[0253] The outer connecting rod is driven to move by the outer motor based on the outer driving instruction sent by the outer lower computer;

[0254] The outer prism is driven to move by the outer connecting rod, and the second end of the outer connecting rod is mechanically connected to the outer prism.

[0255] The outer motor may be mechanically connected to the first end of the outer connecting rod.

[0256] The specific process can be found in the above embodiment and will not be described again here.

[0257] In this way, the outer prism can be moved quickly and accurately according to the outer displacement through the outer motor and the outer connecting rod.

[0258] In some embodiments of the present application, the second end of the outer connecting rod may be further mechanically connected to the outer camera, and the method may further include:

[0259] The outer camera is moved by the outer connecting rod.

[0260] The specific process can be found in the above embodiment and will not be described again here.

[0261] In this way, by mechanically connecting the second end of the outer connecting rod to the outer camera, the relative position between the outer camera and the outer prism can be ensured to remain unchanged, thereby avoiding the outer camera being unable to capture the image of the outside of the outer ear in the outer prism due to the movement of the outer prism in the width direction.

[0262] In some embodiments of the present application, the outer camera may be provided with an outer liquid lens, and the method may further include:

[0263] Sending multiple external voltage signals to the external liquid lens through the external slave computer;

[0264] The external liquid lens changes its focal length based on each external voltage signal;

[0265] The external camera responds to the tab outer side image acquisition instruction, and after each zoom of the external liquid lens, the image in the external prism is acquired to obtain multiple tab outer side images, and the multiple tab outer side images are sent to the host computer;

[0266] Based on this, the above-mentioned external appearance defect detection of the tab outer side is performed by the host computer based on the tab outer side image to obtain the tab outer side detection result, which may include:

[0267] The host computer fuses multiple tab outer side images into a target tab outer side image, and performs appearance defect detection on the tab outer side based on the target tab outer side image to obtain the tab outer side detection result.

[0268] The specific process can be found in the above embodiment and will not be described again here.

[0269] In this way, the outer liquid lens can be zoomed to capture multiple images of the outer side of the tab with different focal lengths, which can be fused into a clearer target outer side image. Based on the clearer target outer side image, the outer side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0270] In some embodiments of the present application, before the external slave computer sends the plurality of external voltage signals to the external liquid lens, the method may further include:

[0271] The upper computer determines the tab width based on the tab image, determines the reference tab width based on the reference tab image, determines the tab width difference based on the tab width and the reference tab width, determines the required number of tab outer side images according to the tab width difference and the preset voltage change, generates multiple outer side voltage signals according to the initial voltage, the preset voltage change and the required number of tab outer side images, and sends the multiple outer side voltage signals to the outer lower computer.

[0272] Here, the reference tab width may be the tab width of a reference tab that is not misaligned.

[0273] Tab misalignment will cause the tab width to increase. The tab width difference is caused by the tab misalignment. Therefore, the tab width difference can be determined based on the tab width and the reference tab width. The tab width difference can be the difference between the tab width and the reference tab width.

[0274] In order to accurately control the zoom of the outer liquid lens and thus capture images of the outer side of the tab with appropriate focal length, the required number of images of the outer side of the tab can be determined based on the tab width difference and the preset voltage change, and then multiple outer voltage signals are generated based on the initial voltage, the preset voltage change and the required number of images of the outer side of the tab. The multiple outer voltage signals are then sent to the outer lower computer so that the outer lower computer can control the zoom of the outer liquid lens.

[0275] The preset voltage variation can be set according to actual needs.

[0276] Specifically, the external voltage signal can be a voltage value. The voltage value sent to the external liquid lens can be adjusted so that the external liquid lens focuses on the outside of the tab, and the voltage value V is recorded. In order to better accommodate system errors, the preset voltage change ΔV of the two image acquisitions can be added by default, that is, the initial voltage can be V+2*ΔV. The greater the voltage input to the external liquid lens, the closer the focal length of the external liquid lens. The preset voltage change ΔV can be set according to actual needs. The preset voltage change ΔV can correspond to the spacing of the image acquisition, and the spacing of the image acquisition can be smaller than the depth of field of the external liquid lens. This process can obtain corresponding data based on the reference battery cell assembly.

[0277] The required number N of images of the outer side of the tab, i.e., the number of image captures by the outer camera, can then be calculated based on the tab width difference and the preset voltage change ΔV. The preset voltage change and the image capture interval can have a corresponding relationship. The image capture interval can be the object distance change. Therefore, the object distance change can be determined based on the preset voltage change. The required number N of images of the outer side of the tab can be the ratio of the tab width difference to the object distance change.

[0278] Furthermore, to better accommodate system errors, two more images of the outer side of the tab can be collected before and after N, meaning the required number of images of the outer side of the tab can be N+2. Based on this, the initial voltage can be: V+2*ΔV, and the ending voltage can be: (V+2*ΔV)-2*ΔV-N*ΔV-2*ΔV.

[0279] Here, multiple external voltage signals can be generated according to the initial voltage of the external liquid lens, the preset voltage change and the required number of images outside the tab, or according to the initial voltage, end voltage and zoom time of the external liquid lens.

[0280] The lower computer can control the continuous zoom of the external liquid lens based on multiple external voltage signals, and continuously trigger the external camera to collect images.

[0281] In this way, the multiple external voltage signals generated based on the above process can more reasonably control the focal length of the external liquid lens, so that the multiple obtained tab external images can be fused into a target tab external image with higher overall clarity.

[0282] In some embodiments of the present application, S620 may include:

[0283] Receive the inner displacement sent by the upper computer through the inner lower computer, generate an inner drive instruction based on the inner displacement, send the inner drive instruction to the inner drive component, and send the inner tab image acquisition instruction to the inner camera;

[0284] The inner prism is driven to move based on the inner driving instruction by the inner driving component;

[0285] The inner side of the tab is imaged through the inner prism;

[0286] The inner camera responds to the tab inner image acquisition instruction, acquires the image in the inner prism, obtains the tab inner image, and sends the tab inner image to the host computer;

[0287] Based on this, the method may further include:

[0288] The upper computer performs appearance defect detection on the inside of the tab based on the inside image of the tab to obtain the inside inspection result of the tab.

[0289] The inner drive assembly may be mechanically connected to the inner prism.

[0290] The specific process can be found in the above embodiment and will not be described again here.

[0291] In this way, by setting up an inner lower machine, an inner drive assembly, an inner prism and an inner camera at the inner side inspection station of the tab, the appearance defect detection of the inner side of the tab can be achieved collaboratively.

[0292] In some embodiments of the present application, the above-mentioned receiving the inner displacement sent by the upper computer through the inner lower computer, generating the inner drive instruction based on the inner displacement, and sending the inner drive instruction to the inner drive component may include:

[0293] The inner side displacement sent by the upper computer is received through the inner side lower computer. When the inner side displacement does not exceed the preset range, an inner side drive instruction is generated based on the inner side displacement and the inner side drive instruction is sent to the inner side drive component.

[0294] Here, the inner lower computer can determine whether the inner displacement exceeds the preset range. If the inner displacement does not exceed the preset range, the inner prism can be moved according to the inner displacement; if the inner displacement exceeds the preset range, the inner prism will not be moved according to the inner displacement.

[0295] The preset range can be set according to actual needs.

[0296] In this way, by sending an inner drive instruction to the inner drive assembly based on the inner displacement only when the inner displacement does not exceed the preset range, it is possible to avoid the inner prism being moved to the wrong position due to inaccurate inner displacement, thereby preventing safety hazards.

[0297] In some embodiments of the present application, the aforementioned driving of the inner prism to move based on the inner driving instruction by the inner driving assembly may include:

[0298] The inner connecting rod is driven to move by the inner motor based on the inner driving instruction sent by the inner lower computer;

[0299] The inner prism is driven to move by the inner connecting rod.

[0300] The inner motor may be mechanically connected to a first end of the inner connecting rod, and the second end of the inner connecting rod may be mechanically connected to the inner prism.

[0301] The specific process can be found in the above embodiment and will not be described again here.

[0302] In this way, the inner prism can be moved quickly and accurately according to the inner displacement through the inner motor and the inner connecting rod.

[0303] In some embodiments of the present application, the second end of the inner connecting rod may be further mechanically connected to the inner camera, and the method may further include:

[0304] The inner camera is moved by the inner connecting rod.

[0305] The specific process can be found in the above embodiment and will not be described again here.

[0306] In this way, by mechanically connecting the second end of the inner connecting rod to the inner camera, the relative position between the inner camera and the inner prism can be ensured to remain unchanged, thereby avoiding the inner camera being unable to capture the image of the inner side of the tab in the inner prism due to the movement of the inner prism in the width direction.

[0307] In some embodiments of the present application, the inner camera may be provided with an inner liquid lens, and the method may further include:

[0308] Sending multiple inner voltage signals to the inner liquid lens via the inner lower computer;

[0309] The inner liquid lens changes its focal length based on each inner voltage signal;

[0310] The inner camera responds to the tab inner image acquisition instruction, and after each zoom of the inner liquid lens, the inner camera acquires the image in the inner prism to obtain multiple tab inner images, and sends the multiple tab inner images to the host computer;

[0311] Based on this, the above-mentioned detection of the inner side of the tab by the host computer based on the inner side image of the tab to obtain the inner side inspection result of the tab may include:

[0312] The host computer fuses multiple tab inner side images into a target tab inner side image, and performs appearance defect detection on the tab inner side based on the target tab inner side image to obtain the tab inner side detection result.

[0313] The specific process can be found in the above embodiment and will not be described again here.

[0314] In this way, the inner liquid lens can be zoomed to capture multiple images of the inner side of the tab with different focal lengths, which are fused into a clearer target inner side image. Based on the clearer target inner side image, the inner side of the tab can be inspected for appearance defects, which can improve the accuracy of inspection.

[0315] In some embodiments of the present application, before the inner slave computer sends the multiple inner voltage signals to the inner liquid lens, the method may further include:

[0316] The upper computer determines the tab width based on the tab image, determines the reference tab width based on the reference tab image, determines the tab width difference based on the tab width and the reference tab width, determines the required number of tab inner images according to the tab width difference and the preset voltage change, generates multiple inner voltage signals according to the initial voltage, the preset voltage change and the required number of tab inner images, and sends the multiple inner voltage signals to the inner lower computer.

[0317] The process of generating multiple inner voltage signals is the same as the process of generating multiple outer voltage signals described above, and will not be repeated here.

[0318] In this way, the multiple inner voltage signals generated based on the above process can more reasonably control the focal length of the inner liquid lens, so that the multiple tab inner images obtained can be fused into a target tab inner image with higher overall clarity.

[0319] In some embodiments of the present application, the method may further include:

[0320] Through the tab position detection station, when the battery cell assembly arrives at the tab position detection station, the tab image of the battery cell assembly is collected, and the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly are determined based on the tab image.

[0321] The tab position detection station may be located upstream of at least one tab outer side detection station and at least one tab inner side detection station.

[0322] The specific process can be found in the above embodiment and will not be described again here.

[0323] In this way, the tab image can be collected through the tab position detection station to quickly and accurately determine the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab.

[0324] In some embodiments of the present application, when the battery cell assembly reaches the tab position detection station, collecting the tab image of the battery cell assembly, and determining the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image may include:

[0325] When the battery cell assembly reaches the tab position detection station, the position detection camera is used to capture the tab image of the battery cell assembly and send the tab image to the host computer;

[0326] The actual coordinates of the outer side and the inner side of the tab of the battery cell assembly are determined by the host computer based on the tab image.

[0327] The specific process can be found in the above embodiment and will not be described again here.

[0328] In this way, the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0329] In some embodiments of the present application, the method may further include:

[0330] Through the tab position detection station, when the reference battery cell assembly arrives at the tab position detection station, the reference tab image of the reference battery cell assembly is collected, and the tab outer side reference coordinates and the tab inner side reference coordinates of the reference battery cell assembly are determined based on the reference tab image.

[0331] The specific process can be found in the above embodiment and will not be described again here.

[0332] In this way, the reference tab image can be collected through the tab position detection station to quickly and accurately determine the reference coordinates of the outer side of the tab and the reference coordinates of the inner side of the tab.

[0333] In some embodiments of the present application, when the reference cell assembly reaches the tab position detection station through the tab position detection station, collecting a reference tab image of the reference cell assembly, and determining the tab outer side reference coordinates and the tab inner side reference coordinates of the reference cell assembly based on the reference tab image may include:

[0334] When the reference cell assembly arrives at the tab position detection station, a position detection camera is used to capture a reference tab image of the reference cell assembly and send the reference tab image to the host computer;

[0335] The upper computer determines the outer and inner reference coordinates of the tab of the reference cell assembly based on the reference tab image.

[0336] The specific process can be found in the above embodiment and will not be described again here.

[0337] In this way, the outer side reference coordinates and the inner side reference coordinates of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0338] The embodiment of the present application further provides a tab detection method, which may be executed by a host computer. The tab detection method provided in the embodiment of the present application is introduced below.

[0339] FIG7 is a flow chart of a tab detection method provided in some embodiments of the present application.

[0340] As shown in FIG7 , the tab detection method may include the following steps:

[0341] S710, when the battery cell assembly arrives at the tab outer side inspection station, based on the actual coordinates of the tab outer side of the battery cell assembly and the reference coordinates of the tab outer side, determine the outer displacement of the outer prism in the width direction; send the outer displacement to the outer lower computer so that the outer lower computer controls the outer prism to move according to the outer displacement, so as to image the outer side of the tab of the battery cell assembly through the outer prism; receive the tab outer side image sent by the outer camera; perform appearance defect inspection on the tab outer side based on the tab outer side image, and obtain the tab outer side inspection result;

[0342] S720, when the battery cell assembly arrives at the inner side of the tab inspection station, the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab; the inner displacement is sent to the inner lower computer so that the inner lower computer controls the inner prism to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism; the inner side image of the tab is received from the inner camera; the inner side of the tab is inspected for appearance defects on the inner side of the tab based on the inner side image of the tab to obtain the inner side inspection result of the tab.

[0343] The outer side image of the tab can be obtained by capturing the image from the outer prism with the outer camera, and the inner side image of the tab can be obtained by capturing the image from the inner prism with the inner camera.

[0344] The specific process of S710-S720 can be found in the above embodiment and will not be repeated here.

[0345] Thus, when the battery cell assembly arrives at the outer side inspection station of the tab, the outer side displacement of the outer prism in the width direction can be determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab, and the outer side displacement can be sent to the outer side lower computer so that the outer side lower computer controls the outer side prism to move according to the outer side displacement, so as to image the outer side of the tab of the battery cell assembly through the outer side prism, receive the outer side image of the tab sent by the outer camera, the outer side image of the tab is obtained by the outer camera capturing the image in the outer prism, and then the outer side of the tab is inspected for appearance defects based on the outer side image of the tab to obtain the outer side inspection result of the tab; and When arriving at the inner side inspection station of the tab, the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab, and the inner displacement is sent to the inner lower computer so that the inner lower computer controls the inner prism to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism, and receive the inner side image of the tab sent by the inner camera. The inner side image of the tab is obtained by the inner camera capturing the image in the inner prism, and then the inner side of the tab is inspected for appearance defects based on the inner side image of the tab to obtain the inner side inspection result of the tab, thereby realizing the detection of appearance defects of the tab. In addition, the outer displacement of the outer prism in the width direction is determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab. The position of the outer prism can be dynamically adjusted according to the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, thereby avoiding the situation where the outer prism can only be extended to a fixed position when the tab is misplaced, causing the outer prism to hit the outer side of the tab, thereby causing a safety hazard. Similarly, the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab. The position of the inner prism can be dynamically adjusted according to the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab, thereby avoiding the situation where the inner prism can only be extended to a fixed position when the tab is misplaced, causing the inner prism to hit the inner side of the tab, thereby causing a safety hazard.

[0346] In some embodiments of the present application, determining the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab may include:

[0347] Determine the misalignment amount of the outer side of the tab of the battery cell assembly based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab;

[0348] Based on the outer misalignment of the tab, the outer displacement of the outer prism in the width direction is determined;

[0349] The determination of the inner displacement of the inner prism in the width direction based on the actual inner coordinates of the tab of the battery cell assembly and the reference inner coordinates of the tab may include:

[0350] Determine the misalignment amount of the inner side of the tab of the battery cell assembly based on the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab;

[0351] Based on the amount of misalignment on the inner side of the tab, the inner displacement of the inner prism in the width direction is determined.

[0352] Here, the tab outer misalignment amount can be the difference between the tab outer actual coordinate and the tab outer reference coordinate. The outer displacement can be equal to the tab outer misalignment amount. In other words, the outer displacement required for the outer prism to move can be equal to the tab outer misalignment amount.

[0353] The tab inner misalignment can be the difference between the actual tab inner coordinate and the tab inner reference coordinate. The inner displacement can be equal to the tab inner misalignment. In other words, the inner displacement required for the inner prism to move can be equal to the tab inner misalignment.

[0354] In this way, by using the outer misalignment of the tab as the outer displacement of the outer prism, the relative position of the outer tab and the outer prism can be guaranteed to remain unchanged, preventing the tab misalignment from causing the outer tab and the outer prism to come too close together, or even to contact, causing damage to the tab. Similarly, by using the inner misalignment of the tab as the inner displacement of the inner prism, the relative position of the inner tab and the inner prism can be guaranteed to remain unchanged, preventing the tab misalignment from causing the inner tab and the inner prism to come too close together, or even to contact, causing damage to the tab.

[0355] In some embodiments of the present application, determining the outer displacement of the outer prism in the width direction based on the outer misalignment of the tab may include:

[0356] Obtaining the outer prism reference coordinates of the outer prism in the width direction;

[0357] Determining the outer displacement of the outer prism in the width direction based on the outer misalignment of the tab and the reference coordinates of the outer prism;

[0358] The above-mentioned determination of the inner displacement of the inner prism in the width direction based on the inner misalignment of the tab may include:

[0359] Obtaining the inner prism reference coordinates of the inner prism in the width direction;

[0360] Based on the inner misalignment of the tab and the reference coordinates of the inner prism, the inner displacement of the inner prism in the width direction is determined.

[0361] Here, the outer prism reference coordinates may be the position where the outer prism should be located when there is no tab misalignment. The outer prism should be located at a position where it can image the outer side of the tab without touching the tab.

[0362] In actual operation, the position of the outer prism can be dynamically determined based on the misalignment of the tab. In order to ensure the relative position of the outer prism and the outer side of the tab, the position of the outer prism can be determined based on the misalignment amount of the tab and the reference coordinates of the outer prism. The position of the outer prism can be equal to the sum of the misalignment amount of the tab and the reference coordinates of the outer prism. The outer displacement can be the displacement of the outer prism from the outer prism reference coordinates to the position where the outer prism should be located. Specifically, the outer displacement can be equal to the difference between the position where the outer prism should be located and the reference coordinates of the outer prism.

[0363] It should be noted that the amount of lateral misalignment can be positive or negative.

[0364] The inner prism reference coordinates may be the position where the inner prism should be located when the tab is not misaligned. The inner prism should be located at a position where it can image the inner side of the tab without touching the tab.

[0365] In actual operation, the position of the inner prism can be dynamically determined based on the misalignment of the tab. In order to ensure the relative position of the inner prism and the inner side of the tab, the position of the inner prism can be determined based on the inner misalignment of the tab and the inner prism reference coordinates. The position of the inner prism can be equal to the sum of the inner misalignment of the tab and the inner prism reference coordinates. The inner displacement can be the displacement of the inner prism from the inner prism reference coordinates to the position where the inner prism should be. Specifically, the inner displacement can be equal to the difference between the position where the inner prism should be and the inner prism reference coordinates.

[0366] It should be noted that the amount of medial misalignment can be positive or negative.

[0367] In this way, the outer displacement of the outer prism can be accurately determined based on the outer misalignment of the tab and the reference coordinates of the outer prism, and the inner displacement of the inner prism can be accurately determined based on the inner misalignment of the tab and the reference coordinates of the inner prism.

[0368] In related art, the standard tilt angle of the prism extension is usually 45°. However, in order to better detect the base information of the tab (close to the cell end), the actual tilt angle of the prism is generally increased by 2° to 3°. In this way, the distance from the prism to the tab is variable, and the consistency of imaging is difficult to ensure. In order to ensure the consistency of imaging, in some embodiments of the present application, the above-mentioned acquisition of the outer prism reference coordinates in the width direction of the outer prism can include:

[0369] Determine the outer prism reference coordinate based on the outer tab reference coordinate and the preset distance;

[0370] The obtaining of the inner prism reference coordinates in the width direction of the inner prism may include:

[0371] The inner prism reference coordinates are determined based on the inner tab reference coordinates and the preset distance.

[0372] Here, if the outer prism is located in the negative direction of the outer side of the tab, the outer prism reference coordinate can be the difference between the outer side of the tab reference coordinate and the preset distance; if the outer prism is located in the positive direction of the outer side of the tab, the outer prism reference coordinate can be the sum of the outer side of the tab reference coordinate and the preset distance. The positive direction is the positive direction of the coordinate axis on which the outer side of the tab reference coordinate is located, and the negative direction is the direction opposite to the positive direction.

[0373] The preset distance can be set according to actual needs. When setting the preset distance, system errors can be taken into account and the distance between the outer prism and the tab is ensured to be no less than the safe distance.

[0374] Exemplarily, as shown in Figure 8, if the outer reference coordinate of the pole tab is the coordinate of the outer corner point 810 of the first pole tab, and the preset distance is a, then the outer prism reference coordinate is the difference between the outer reference coordinate of the pole tab and the preset distance, that is, the outer prism reference coordinate is the coordinate of point 820; if the outer reference coordinate of the pole tab is the coordinate of the outer corner point 830 of the second pole tab, and the preset distance is a, then the outer prism reference coordinate is the sum of the outer reference coordinate of the pole tab and the preset distance, that is, the outer prism reference coordinate is the coordinate of point 840.

[0375] If the inner prism is located in the negative direction of the inner side of the tab, the inner prism reference coordinate can be the difference between the inner side of the tab reference coordinate and the preset distance. If the inner prism is located in the positive direction of the inner side of the tab, the inner prism reference coordinate can be the sum of the inner side of the tab reference coordinate and the preset distance. The positive direction is the positive direction of the coordinate axis on which the inner side of the tab reference coordinate lies, and the negative direction is the direction opposite to the positive direction.

[0376] The preset distance can be set according to actual needs. When setting the preset distance, system errors can be taken into account and the distance between the inner prism and the tab is ensured to be no less than the safe distance.

[0377] The preset distance used to determine the reference coordinates of the outer prism may be different from the preset distance used to determine the reference coordinates of the inner prism.

[0378] Exemplarily, as shown in Figure 8, if the inner reference coordinate of the pole tab is the coordinate of the inner corner point 850 of the first pole tab, and the preset distance is b, then the inner prism reference coordinate is the sum of the inner reference coordinate of the pole tab and the preset distance, that is, the inner prism reference coordinate is the coordinate of point 860; if the inner reference coordinate of the pole tab is the coordinate of the inner corner point 870 of the second pole tab, and the preset distance is b, then the inner prism reference coordinate is the difference between the inner reference coordinate of the pole tab and the preset distance, that is, the inner prism reference coordinate is the coordinate of point 880.

[0379] In this way, by determining the outer prism reference coordinates based on the tab outer reference coordinates and the preset distance, it is possible to always ensure that the distance between the outer prism and the outer side of the tab is the preset distance, ensuring that the relative position of the outer prism and the tab remains unchanged, thereby ensuring that the position of the tab in the collected tab outer image is relatively fixed, ensuring imaging consistency. By determining the inner prism reference coordinates based on the tab inner reference coordinates and the preset distance, it is possible to always ensure that the distance between the inner prism and the inner side of the tab is the preset distance, ensuring that the relative position of the inner prism and the tab remains unchanged, thereby ensuring that the position of the tab in the collected tab inner image is relatively fixed, ensuring imaging consistency.

[0380] In some embodiments of the present application, performing appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab may include:

[0381] Fusing multiple tab outer side images into a target tab outer side image;

[0382] Performing appearance defect detection on the outer side of the tab based on the target outer side image to obtain an outer side inspection result of the tab;

[0383] The above-mentioned detection of appearance defects on the inner side of the tab based on the inner side image of the tab to obtain the inner side inspection result of the tab may include:

[0384] Fusing multiple tab inner side images into a target tab inner side image;

[0385] Based on the target tab inner side image, the inner side of the tab is inspected for appearance defects to obtain the tab inner side inspection result.

[0386] The specific process can be found in the above embodiment and will not be described again here.

[0387] In this way, the appearance defects of the outside of the tab can be detected based on the clearer target outside of the tab image obtained by fusing multiple outside of the tab images, and the appearance defects of the inside of the tab can be detected based on the clearer target inside of the tab image obtained by fusing multiple inside of the tab images, thereby improving the accuracy of detection.

[0388] In some embodiments of the present application, before S710, the method may further include:

[0389] Receive the tab image of the battery cell assembly sent by the position detection camera;

[0390] The actual coordinates of the outer side and the inner side of the tab of the battery cell assembly are determined based on the tab image.

[0391] The specific process can be found in the above embodiment and will not be described again here.

[0392] In this way, the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0393] In some embodiments of the present application, determining the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image may include:

[0394] Determine the outer-side pixel coordinates and the inner-side pixel coordinates of the outer side of the tab in the tab image;

[0395] The pixel coordinates on the outside of the tab are converted to the coordinate system corresponding to the outer drive component of the outer prism to obtain the actual coordinates of the outside of the tab, and the pixel coordinates on the inside of the tab are converted to the coordinate system corresponding to the inner drive component of the inner prism to obtain the actual coordinates of the inside of the tab.

[0396] Here, the coordinate system corresponding to the position detection camera is different from the coordinate system corresponding to the outer drive assembly, and the coordinate system corresponding to the position detection camera is also different from the coordinate system corresponding to the inner drive assembly, so a unified coordinate system is needed.

[0397] The coordinate system corresponding to the outer drive assembly and the coordinate system corresponding to the inner drive assembly can both be world coordinate systems.

[0398] In this way, by converting the outer-side pixel coordinates of the outer side of the tab in the tab image into the coordinate system corresponding to the outer drive component, the actual coordinates of the outer side of the tab are obtained, and then the outer displacement is determined based on the actual coordinates of the outer side of the tab. This allows the outer drive component to directly move the outer prism based on the outer displacement without the need to perform coordinate conversion on the outer displacement, which is simple and efficient. By converting the inner-side pixel coordinates of the inner side of the tab in the tab image into the coordinate system corresponding to the inner drive component, the actual coordinates of the inner side of the tab are obtained, and then the inner displacement is determined based on the actual coordinates of the inner side of the tab. This allows the inner drive component to directly move the inner prism based on the inner displacement without the need to perform coordinate conversion on the inner displacement, which is simple and efficient.

[0399] Moreover, when changing the cutting and pulling shape, there is no need to reconfirm the reference position, which improves the efficiency of cutting and pulling shape change.

[0400] In some embodiments of the present application, before S710, the method may further include:

[0401] receiving a reference tab image of a reference battery cell assembly sent by a position detection camera;

[0402] The outer side reference coordinates and the inner side reference coordinates of the tab of the reference battery cell assembly are determined based on the reference tab image.

[0403] The specific process can be found in the above embodiment and will not be described again here.

[0404] In this way, the outer side reference coordinates and the inner side reference coordinates of the tab can be quickly and accurately determined based on the tab image captured by the position detection camera.

[0405] In some embodiments of the present application, determining the outer side reference coordinates and the inner side reference coordinates of the tab of the reference cell assembly based on the reference tab image may include:

[0406] Determine the outer side reference pixel coordinates and the inner side reference pixel coordinates of the reference tab of the reference cell assembly in the reference tab image;

[0407] The reference pixel coordinates on the outside of the tab are converted to the coordinate system corresponding to the outer drive component of the outer prism to obtain the reference coordinates on the outside of the tab, and the reference pixel coordinates on the inside of the tab are converted to the coordinate system corresponding to the inner drive component of the inner prism to obtain the reference coordinates on the inside of the tab.

[0408] The process of obtaining the reference coordinates of the outer side of the tab is the same as the process of obtaining the actual coordinates of the outer side of the tab, and the process of obtaining the reference coordinates of the inner side of the tab is the same as the process of obtaining the actual coordinates of the inner side of the tab, which will not be repeated here.

[0409] In this way, by converting the outer lug reference pixel coordinates of the reference lug outer side in the reference lug image into the coordinate system corresponding to the outer drive component, the outer lug reference coordinates are obtained, and then the outer displacement is determined based on the outer lug reference coordinates. This allows the outer drive component to directly move the outer prism based on the outer displacement without the need to perform coordinate conversion on the outer displacement, which is simple and efficient. By converting the inner lug reference pixel coordinates of the reference lug inner side in the reference lug image into the coordinate system corresponding to the inner drive component, the inner lug reference coordinates are obtained, and then the inner displacement is determined based on the inner lug reference coordinates. This allows the inner drive component to directly move the inner prism based on the inner displacement without the need to perform coordinate conversion on the inner displacement, which is simple and efficient.

[0410] Moreover, when changing the cutting and pulling shape, there is no need to reconfirm the reference position, which improves the efficiency of cutting and pulling shape change.

[0411] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A tab detection system, comprising: At least one tab outer side detection station, configured to control the outer side prism to move according to an outer side displacement when the battery cell assembly arrives at the tab outer side detection station, so as to image the outer side of the tab of the battery cell assembly through the outer side prism, collect the image in the outer side prism, and obtain an image of the tab outer side, wherein the image of the tab outer side is used to determine a tab outer side detection result, and the outer side displacement is the displacement of the outer side prism in the width direction determined based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab; At least one tab inner side detection station is used to control the inner prism to move according to the inner displacement when the battery cell assembly reaches the tab inner side detection station, so as to image the inner side of the tab of the battery cell assembly through the inner prism, collect the image in the inner prism, and obtain the tab inner side image, the tab inner side image is used to determine the tab inner side detection result, and the inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the tab inner side reference coordinates.

2. The system according to claim 1, further comprising: The tab position detection station is located upstream of the at least one tab outer side detection station and the at least one tab inner side detection station, and is used to collect the tab image of the battery cell assembly when the battery cell assembly arrives at the tab position detection station, and determine the actual coordinates of the tab outer side and the actual coordinates of the tab inner side of the battery cell assembly based on the tab image.

3. The system according to claim 2, wherein: The tab position detection station is also used to collect a reference tab image of the reference battery cell assembly when the reference battery cell assembly arrives at the tab position detection station, and determine the tab outer reference coordinates and the tab inner reference coordinates of the reference battery cell assembly based on the reference tab image.

4. The system according to claim 3, further comprising: The host computer is used to determine the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, and to determine the inner displacement of the inner prism in the width direction based on the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab.

5. The system according to claim 4, wherein: The tab outer side detection station includes: an outer lower computer, electrically connected to the upper computer, the outer drive assembly and the outer camera, respectively, for receiving the outer displacement sent by the upper computer, generating an outer drive instruction based on the outer displacement, sending the outer drive instruction to the outer drive assembly, and sending an outer tab image acquisition instruction to the outer camera; The outer drive assembly is mechanically connected to the outer prism and is used to drive the outer prism to move based on the outer drive instruction; The outer prism is used to image the outer side of the tab; The outer camera is electrically connected to the host computer, and is used to respond to the tab outer side image acquisition instruction, acquire the image in the outer prism, obtain the tab outer side image, and send the tab outer side image to the host computer; The host computer is further configured to perform appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab.

6. The system according to claim 5, wherein: The outer drive assembly includes: an outer motor electrically connected to the outer lower computer and mechanically connected to the first end of the outer connecting rod, and configured to drive the outer connecting rod to move based on the outer driving instruction sent by the outer lower computer; The outer connecting rod, the second end of the outer connecting rod is mechanically connected to the outer prism, and the outer connecting rod is used to drive the outer prism to move.

7. The system according to claim 6, wherein: The second end of the outer connecting rod is also mechanically connected to the outer camera, and the outer connecting rod is also used to drive the outer camera to move.

8. The system according to any one of claims 5 to 7, wherein: The outer camera is provided with an outer liquid lens, and the outer liquid lens is electrically connected to the outer lower machine; The external slave computer is further configured to send a plurality of external voltage signals to the external liquid lens; The outer liquid lens is used to change its focal length based on each of the outer voltage signals; The outer camera is further configured to respond to the tab outer side image acquisition instruction, acquire the image in the outer prism after each zoom of the outer liquid lens, obtain multiple tab outer side images, and send the multiple tab outer side images to the host computer; The host computer is further configured to fuse the plurality of tab outer side images into a target tab outer side image, and perform appearance defect detection on the tab outer side based on the target tab outer side image to obtain the tab outer side detection result.

9. The system according to claim 4, wherein: The tab inner side detection station includes: an inner lower computer, electrically connected to the upper computer, the inner drive assembly and the inner camera, respectively, for receiving the inner displacement sent by the upper computer, generating an inner drive instruction based on the inner displacement, sending the inner drive instruction to the inner drive assembly, and sending a tab inner image acquisition instruction to the inner camera; The inner driving assembly is mechanically connected to the inner prism and is used to drive the inner prism to move based on the inner driving instruction; The inner prism is used to image the inner side of the tab; The inner camera is electrically connected to the host computer, and is used to respond to the tab inner image acquisition instruction, acquire the image in the inner prism, obtain the tab inner image, and send the tab inner image to the host computer; The host computer is further configured to perform appearance defect detection on the inner side of the tab based on the inner side image of the tab to obtain the inner side detection result of the tab.

10. The system according to claim 9, wherein: The inner drive assembly includes: an inner motor, electrically connected to the inner lower computer and mechanically connected to the first end of the inner connecting rod, and configured to drive the inner connecting rod to move based on the inner driving instruction sent by the inner lower computer; The inner connecting rod, the second end of the inner connecting rod is mechanically connected to the inner prism, and the inner connecting rod is used to drive the inner prism to move.

11. The system according to claim 10, wherein: The second end of the inner connecting rod is also mechanically connected to the inner camera, and the inner connecting rod is also used to drive the inner camera to move.

12. The system according to any one of claims 9 to 11, wherein: The inner camera is provided with an inner liquid lens, and the inner liquid lens is electrically connected to the inner lower machine; The inner lower computer is further used to send a plurality of inner voltage signals to the inner liquid lens; The inner liquid lens is used to change its focal length based on each of the inner voltage signals; The inner camera is further configured to respond to the tab inner image acquisition instruction, acquire the image in the inner prism after each zoom of the inner liquid lens, obtain multiple tab inner images, and send the multiple tab inner images to the host computer; The host computer is further configured to fuse the plurality of tab inner side images into a target tab inner side image, and perform appearance defect detection on the tab inner side based on the target tab inner side image to obtain the tab inner side detection result.

13. The system according to any one of claims 4 to 12, wherein: The tab position detection station includes: a position detection camera, electrically connected to the host computer, for collecting an image of the tab of the battery cell assembly when the battery cell assembly arrives at the tab position detection station, and sending the image of the tab to the host computer; The host computer is further configured to determine the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab of the battery cell assembly based on the tab image.

14. The system according to claim 13, wherein: The position detection camera is further configured to capture a reference tab image of the reference cell assembly when the reference cell assembly arrives at the tab position detection station, and transmit the reference tab image to the host computer; The host computer is further configured to determine the tab outer side reference coordinates and the tab inner side reference coordinates of the reference battery cell assembly based on the reference tab image.

15. The system according to any one of claims 1 to 14, wherein: The at least one tab outer side inspection station includes two, and the at least one tab inner side inspection station includes two.

16. A tab detection method comprising: By at least one tab outer side detection station, when the battery cell assembly reaches the tab outer side detection station, controlling the outer side prism to move according to the outer side displacement, so as to image the outer side of the tab of the battery cell assembly through the outer side prism, collecting the image in the outer side prism to obtain the tab outer side image, the tab outer side image is used to determine the tab outer side detection result, and the outer side displacement is the displacement of the outer side prism in the width direction determined based on the actual coordinates of the tab outer side of the battery cell assembly and the tab outer side reference coordinates; Through at least one inner tab detection station, when the battery cell assembly reaches the inner tab detection station, the inner prism is controlled to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism, and the imaging in the inner prism is collected to obtain the inner tab image, and the inner tab image is used to determine the inner tab detection result, and the inner displacement is the displacement of the inner prism in the width direction determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the inner tab reference coordinates.

17. The method according to claim 16, further comprising: Through the tab position detection station, when the battery cell assembly arrives at the tab position detection station, the tab image of the battery cell assembly is collected, and the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab of the battery cell assembly are determined based on the tab image. The tab position detection station is located upstream of the at least one tab outer side detection station and the at least one tab inner side detection station.

18. The method according to claim 17, further comprising: Through the tab position detection station, when the reference battery cell assembly arrives at the tab position detection station, the reference tab image of the reference battery cell assembly is collected, and the tab outer reference coordinates and the tab inner reference coordinates of the reference battery cell assembly are determined based on the reference tab image.

19. The method according to claim 18, further comprising: Through the host computer, the outer displacement of the outer prism in the width direction is determined based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab, and the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab and the reference coordinates of the inner side of the tab.

20. The method according to claim 19, wherein The method includes: controlling the outer prism to move according to the outer displacement when the battery cell assembly reaches the outer tab detection station through at least one outer tab detection station, so as to image the outer side of the tab of the battery cell assembly through the outer prism, and collecting the image in the outer prism to obtain the outer side image of the tab, including: Receiving, by an outer lower computer, the outer displacement sent by the upper computer, generating an outer drive instruction based on the outer displacement, sending the outer drive instruction to an outer drive component, and sending an outer tab outer image acquisition instruction to an outer camera, wherein the outer drive component is mechanically connected to the outer prism; driving the outer prism to move based on the outer driving instruction by the outer driving component; Imaging the outer side of the tab through the outer prism; By means of the external camera, in response to the tab outer side image acquisition instruction, the image in the external prism is acquired to obtain the tab outer side image, and the tab outer side image is sent to the host computer; The method further comprises: The upper computer performs appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab.

21. The method according to claim 20, wherein The step of driving the outer prism to move based on the outer driving instruction by the outer driving component includes: The outer connecting rod is driven to move by an outer motor based on the outer driving instruction sent by the outer lower computer, and the outer motor is mechanically connected to the first end of the outer connecting rod; The outer prism is driven to move by the outer connecting rod, and the second end of the outer connecting rod is mechanically connected to the outer prism.

22. The method of claim 21 , wherein the second end of the outer connecting rod is further mechanically connected to the outer camera, the method further comprising: The outer camera is driven to move by the outer connecting rod.

23. The method according to any one of claims 20 to 22, wherein the outer camera is provided with an outer liquid lens, the method further comprising: Sending a plurality of external voltage signals to the external liquid lens through the external slave computer; changing the focal length of the outer liquid lens based on each of the outer voltage signals; In response to the tab outer side image acquisition instruction, the outer camera acquires the image in the outer prism after each zoom of the outer liquid lens to obtain a plurality of tab outer side images, and sends the plurality of tab outer side images to the host computer; The performing, by the host computer, an appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab includes: The host computer fuses the plurality of tab outer side images into a target tab outer side image, and performs appearance defect detection on the tab outer side based on the target tab outer side image to obtain the tab outer side detection result.

24. The method according to claim 23, before sending a plurality of external voltage signals to the external liquid lens through the external slave computer, the method further comprises: The upper computer determines the tab width based on the tab image, determines the reference tab width based on the reference tab image, determines the tab width difference based on the tab width and the reference tab width, determines the required number of tab outer images according to the tab width difference and a preset voltage change, generates multiple outer voltage signals according to the initial voltage, the preset voltage change and the required number of tab outer images, and sends the multiple outer voltage signals to the outer lower computer.

25. The method according to claim 19, wherein The method includes: controlling the inner prism to move according to the inner displacement when the battery cell assembly reaches the inner tab detection station through at least one inner tab detection station, so as to image the inner side of the tab of the battery cell assembly through the inner prism, and collecting the image in the inner prism to obtain the inner tab image, including: receiving, by the inner lower computer, the inner displacement sent by the upper computer, generating an inner drive instruction based on the inner displacement, sending the inner drive instruction to the inner drive component, and sending an inner tab image acquisition instruction to the inner camera, wherein the inner drive component is mechanically connected to the inner prism; driving the inner prism to move based on the inner driving instruction by the inner driving component; Imaging the inner side of the tab through the inner prism; The inner camera responds to the tab inner image acquisition instruction to acquire the image in the inner prism to obtain the tab inner image, and sends the tab inner image to the host computer; The method further comprises: The upper computer performs appearance defect detection on the inner side of the tab based on the inner side image of the tab to obtain the inner side detection result of the tab.

26. The method according to claim 25, wherein The step of driving the inner prism to move based on the inner driving instruction by the inner driving component includes: driving the inner connecting rod to move based on the inner driving instruction sent by the inner lower computer via the inner motor, wherein the inner motor is mechanically connected to the first end of the inner connecting rod; The inner prism is driven to move by the inner connecting rod, and the second end of the inner connecting rod is mechanically connected to the inner prism.

27. The method of claim 26, wherein the second end of the inner connecting rod is further mechanically connected to the inner camera, the method further comprising: The inner camera is driven to move by the inner connecting rod.

28. The method according to any one of claims 25 to 27, wherein the inner camera is provided with an inner liquid lens, the method further comprising: Sending a plurality of inner voltage signals to the inner liquid lens through the inner slave computer; changing the focal length of the inner liquid lens based on each of the inner voltage signals; The inner camera responds to the tab inner image acquisition instruction, and after each zoom of the inner liquid lens, acquires the image in the inner prism to obtain a plurality of tab inner images, and sends the plurality of tab inner images to the host computer; The upper computer performs appearance defect detection on the inner side of the tab based on the inner side image of the tab to obtain the inner side detection result of the tab, including: The host computer fuses the plurality of tab inner side images into a target tab inner side image, and performs appearance defect detection on the tab inner side based on the target tab inner side image to obtain the tab inner side detection result.

29. The method according to claim 28, before sending a plurality of inner voltage signals to the inner liquid lens through the inner slave computer, the method further comprises: The upper computer determines the tab width based on the tab image, determines the reference tab width based on the reference tab image, determines the tab width difference based on the tab width and the reference tab width, determines the required number of tab inner images according to the tab width difference and a preset voltage change, generates multiple inner voltage signals according to the initial voltage, the preset voltage change and the required number of tab inner images, and sends the multiple inner voltage signals to the inner lower computer.

30. The method according to any one of claims 19 to 29, wherein The method includes: collecting a tab image of the battery cell assembly when the battery cell assembly reaches the tab position detection station; and determining the actual coordinates of the outer side and the inner side of the tab of the battery cell assembly based on the tab image, including: When the battery cell assembly reaches the tab position detection station, a position detection camera is used to capture a tab image of the battery cell assembly, and the tab image is sent to the host computer; The host computer determines the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab of the battery cell assembly based on the tab image.

31. The method according to claim 30, wherein The method includes: collecting a reference tab image of the reference cell assembly when the reference cell assembly reaches the tab position detection station through the tab position detection station; and determining the tab outer side reference coordinate and the tab inner side reference coordinate of the reference cell assembly based on the reference tab image, including: When the reference cell assembly reaches the tab position detection station, the position detection camera is used to capture a reference tab image of the reference cell assembly, and the reference tab image is sent to the host computer; The upper computer determines the outer side reference coordinates and the inner side reference coordinates of the tab of the reference battery cell assembly based on the reference tab image.

32. A tab detection method comprising: When the battery cell assembly arrives at the tab outer side inspection station, based on the actual coordinates of the tab outer side of the battery cell assembly and the reference coordinates of the tab outer side, the outer displacement of the outer prism in the width direction is determined; the outer displacement is sent to the outer lower computer, so that the outer lower computer controls the outer prism to move according to the outer displacement, so as to image the outer side of the tab of the battery cell assembly through the outer prism; the outer side image of the tab is received from the outer camera, and the outer side image of the tab is obtained by the outer camera capturing the image in the outer prism; the outer side of the tab is inspected for appearance defects based on the outer side image of the tab, and the outer side of the tab is inspected to obtain the outer side inspection result of the tab; When the battery cell assembly arrives at the inner side inspection station of the tab, the inner displacement of the inner prism in the width direction is determined based on the actual coordinates of the inner side of the tab of the battery cell assembly and the reference coordinates of the inner side of the tab; the inner displacement is sent to the inner lower computer so that the inner lower computer controls the inner prism to move according to the inner displacement, so as to image the inner side of the tab of the battery cell assembly through the inner prism; the inner side image of the tab is received from the inner camera, and the inner side image of the tab is obtained by the inner camera capturing the image in the inner prism; the inner side of the tab is inspected for appearance defects based on the inner side image of the tab to obtain the inner side inspection result of the tab.

33. The method according to claim 32, wherein The determining of the outer displacement of the outer prism in the width direction based on the actual coordinates of the outer side of the tab of the battery cell assembly and the reference coordinates of the outer side of the tab comprises: Determining the misalignment amount of the outer side of the tab of the battery cell assembly based on the actual coordinates of the outer side of the tab and the reference coordinates of the outer side of the tab; determining the outer displacement of the outer prism in the width direction based on the outer misalignment of the tab; The determining the inner displacement of the inner prism in the width direction based on the actual inner coordinates of the tab of the battery cell assembly and the reference inner coordinates of the tab includes: Determining the inner side misalignment of the tab of the battery cell assembly based on the actual inner side coordinates of the tab and the inner side reference coordinates of the tab; The inner displacement of the inner prism in the width direction is determined based on the inner misalignment amount of the tab.

34. The method according to claim 33, wherein The determining the outer displacement of the outer prism in the width direction based on the outer misalignment of the tab includes: Acquire the outer prism reference coordinates of the outer prism in the width direction; determining the outer displacement of the outer prism in the width direction based on the outer misalignment amount of the tab and the reference coordinates of the outer prism; The determining the inner displacement of the inner prism in the width direction based on the inner misalignment of the tab includes: Acquire the inner prism reference coordinates of the inner prism in the width direction; The inner displacement of the inner prism in the width direction is determined based on the inner misalignment amount of the tab and the inner prism reference coordinates.

35. The method according to claim 34, wherein The obtaining of the outer prism reference coordinates of the outer prism in the width direction includes: Determining the outer prism reference coordinates based on the outer tab reference coordinates and a preset distance; The obtaining of the inner prism reference coordinates of the inner prism in the width direction includes: The inner prism reference coordinate is determined based on the tab inner reference coordinate and a preset distance.

36. The method according to any one of claims 32 to 35, wherein The performing appearance defect detection on the outer side of the tab based on the outer side image of the tab to obtain the outer side detection result of the tab includes: fusing the plurality of tab outer side images into a target tab outer side image; Performing appearance defect detection on the outer side of the tab based on the target outer side image to obtain the outer side detection result of the tab; The performing appearance defect detection on the inner side of the tab based on the inner side image of the tab to obtain the inner side inspection result of the tab includes: fusing the plurality of tab inner side images into a target tab inner side image; Based on the target tab inner side image, the tab inner side is inspected for appearance defects to obtain the tab inner side inspection result.

37. The method according to any one of claims 32 to 36, further comprising: receiving a tab image of the battery cell assembly sent by a position detection camera; The actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab of the battery cell assembly are determined based on the tab image.

38. The method of claim 37, wherein: The determining the actual coordinates of the outer side of the tab and the actual coordinates of the inner side of the tab of the battery cell assembly based on the tab image includes: Determine the outer-side pixel coordinates and the inner-side pixel coordinates of the outer side of the tab in the tab image; The pixel coordinates on the outside of the tab are converted to the coordinate system corresponding to the outer drive component of the outer prism to obtain the actual coordinates of the outside of the tab, and the pixel coordinates on the inside of the tab are converted to the coordinate system corresponding to the inner drive component of the inner prism to obtain the actual coordinates of the inside of the tab.

39. The method according to any one of claims 32 to 38, further comprising: receiving a reference tab image of a reference battery cell assembly sent by a position detection camera; The tab outer side reference coordinate and the tab inner side reference coordinate of the reference battery cell assembly are determined based on the reference tab image.

40. The method of claim 39, wherein The determining the outer side reference coordinates and the inner side reference coordinates of the tab of the reference battery cell assembly based on the reference tab image includes: Determine the outer side reference pixel coordinates and the inner side reference pixel coordinates of the reference tab of the reference battery cell assembly in the reference tab image; The reference pixel coordinates on the outer side of the tab are converted to the coordinate system corresponding to the outer drive component of the outer prism to obtain the reference coordinates on the outer side of the tab, and the reference pixel coordinates on the inner side of the tab are converted to the coordinate system corresponding to the inner drive component of the inner prism to obtain the reference coordinates on the inner side of the tab.

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