Welding quality inspection system and method

Abstract

Provided in the present disclosure are a welding quality inspection system and method. The system is applied to a battery production line, and comprises: an image acquisition apparatus, which is used for acquiring a first image of a first welding part of a product to be inspected; a transmission apparatus, which is used for moving, in response to the end of acquisition of the first image, said product or the image acquisition apparatus to a new position, wherein the image acquisition apparatus is further used for acquiring, at the new position, a second image of a second welding part of said product; a controller, which is used for instructing a processor to analyze the first image and the second image; and the processor, which is used for, on the basis of the instruction from the controller, analyzing the first image at least partially in parallel with the movement of said product or the image acquisition apparatus to the new position, and analyzing the second image, so as to determine the welding quality of the first welding part and the welding quality of the second welding part, wherein the controller is further used for determining an inspection result of said product at least partially on the basis of the welding quality of the first welding part and the welding quality of the second welding part.

Description

Welding quality detection system and method

[0001] Cross-references to related applications

[0002] This disclosure is based on the Chinese application with application number 202410161178.8 and application date February 5, 2024, and claims its priority. The disclosed content of the above-mentioned Chinese application is hereby introduced into this disclosure as a whole. Technical Field

[0003] The present disclosure relates to industrial control technology, and in particular to a welding quality detection system and method. Background Art

[0004] Welding is involved in many steps of the battery production process. For example, common welding methods used in power batteries include spot welding, pull welding, ultrasonic welding, and laser welding. Welding quality can be easily affected by the welding method, parameters, and material, leading to weld failures such as broken welds, leaking welds, cracked spots, and weld pits. Welding quality testing is a crucial step in the battery production process, impacting battery efficiency, service life, stability, and other aspects.

[0005] To inspect weld quality, images of the weld locations can be captured and analyzed for quality control. This process can determine if the battery welds are up to standard. However, image acquisition, image processing, analysis, and final weld quality determination all require time. An inadequately designed weld quality inspection process can disrupt the battery production line's production rhythm and reduce efficiency. Therefore, optimizing the weld quality inspection process to improve production efficiency is a pressing issue.

[0006] Summary of the Invention

[0007] In order to rationally arrange the welding quality inspection process and improve production efficiency, the embodiments of the present disclosure provide the following technical solutions.

[0008] According to one aspect of an embodiment of the present disclosure, a welding quality inspection system is provided for use in a battery production line. The welding quality inspection system includes: a transmission device, an image acquisition device, a controller, and a processor. The controller is communicatively connected to the transmission device, the image acquisition device, and the processor. The image acquisition device is configured to acquire a first image of a first welding portion of a product to be tested. The transmission device is configured to move the product to be tested or the image acquisition device to a new position in response to completion of acquisition of the first image, wherein, at the new position, a second welding portion of the product to be tested is within the image acquisition device's field of view. The image acquisition device is further configured to acquire a second image of a second welding portion of the product to be tested at the new position. The controller is configured to instruct the processor to analyze the first image and to instruct the processor to analyze the second image. The processor is configured to, in accordance with the controller's instruction, analyze the first image to determine the welding quality of the first welding portion and analyze the second image to determine the welding quality of the second welding portion, at least partially in parallel with moving the product to be tested or the image acquisition device to the new position. The controller is further configured to determine an inspection result of the product to be tested based at least in part on the welding quality of the first welding portion and the welding quality of the second welding portion.

[0009] In some embodiments, the controller is further configured to receive an acquisition end indication from the image acquisition device when acquisition of the first image is completed, and to control the transmission device to move the product to be tested or the image acquisition device to the new position in response to the acquisition end indication.

[0010] In some embodiments, the welding quality inspection system further includes: a first transmission device, used to move the product to be tested to a first position before the image acquisition device captures the first image, wherein, at the first position, the first welding part is located within the capture field of view of the image acquisition device, and the controller is further used to receive a first movement-in-place indication in response to the product to be tested having moved to the first position, and to control the image acquisition device to start capturing the first image in response to the first movement-in-place indication.

[0011] In some embodiments, the image acquisition device is further configured to acquire a second image of the second welding position in response to the product to be tested or the image acquisition device being moved to the new position.

[0012] In some embodiments, the controller is further configured to receive a second movement-into-position indication in response to the product to be tested or the image acquisition device being moved to the new position, and to control the image acquisition device to start acquiring the second image in response to the second movement-into-position indication.

[0013] In some embodiments, the welding quality inspection system further includes: a second transmission device for moving the product to be tested to a second position in response to the image acquisition device completing image acquisition of all welding parts to be tested of the product to be tested, wherein the product to be tested is maintained in the second position until the determination of the inspection result is completed.

[0014] In some embodiments, the welding quality inspection system further includes: a third transmission device, configured to move the product to be inspected from the second position to a next process or a waste discharge station according to the determined inspection result.

[0015] In some embodiments, the product to be tested is a battery cell, the battery cell includes a top cover and an outer shell, and the first welding position and the second welding position respectively include one or more pre-weld points between the top cover and the outer shell.

[0016] In some embodiments, the arrangement pattern of the pre-weld points in the first welding location is the same as the arrangement pattern of the pre-weld points in the second welding location, or the arrangement pattern of the pre-weld points in the first welding location is a subset of the arrangement pattern of the pre-weld points in the second welding location.

[0017] In some embodiments, there are multiple image acquisition devices, and the acquisition fields of the image acquisition devices are arranged according to the arrangement pattern of the pre-welding points of the first welding position.

[0018] In some embodiments, the transmission device is further used to move the product to be tested or the image acquisition device to a second new position in response to the completion of the acquisition of the second image, wherein, at the second new position, the third welding part of the product to be tested is located within the acquisition field of view of the image acquisition device, and the image acquisition device is further used to acquire a third image of the third welding part of the product to be tested at the second new position. The controller is further used to instruct the processor to analyze the third image, and the processor is further used to analyze the third image to determine the welding quality of the third welding part. The controller is also used to determine the inspection result of the product to be tested based at least in part on the welding quality of the first welding part, the welding quality of the second welding part, and the welding quality of the third welding part.

[0019] In some embodiments, the first welding location, the second welding location, and the third welding location are distributed at equal intervals.

[0020] According to another aspect of an embodiment of the present disclosure, a welding quality inspection method is provided, which is applied to a welding quality inspection system for a battery production line. The welding quality inspection system includes a controller, a processor, an image acquisition device, and a transmission device. The method includes: the image acquisition device acquiring a first image of a first welding portion of a product to be tested; in response to completion of acquisition of the first image, the transmission device moving the product to be tested or the image acquisition device to a new position, wherein, at the new position, a second welding portion of the product to be tested is located within the acquisition field of view of the image acquisition device; at the new position, the image acquisition device acquiring a second image of the second welding portion of the product to be tested; the processor analyzing the first image according to an instruction of the controller to determine a welding quality of the first welding portion; the processor analyzing the second image according to an instruction of the controller to determine a welding quality of the second welding portion; and the controller determining an inspection result of the product to be tested based at least in part on the welding quality of the first welding portion and the welding quality of the second welding portion, wherein the analyzing the first image and the moving the product to be tested or the image acquisition device to the new position are performed at least in part in parallel.

[0021] In some embodiments, in response to the completion of acquisition of the first image, the transmission device moves the product to be tested or the image acquisition device to a new position, including: when the acquisition of the first image is completed, the controller receives an acquisition end indication; in response to the acquisition end indication, the controller controls the transmission device to start moving the product to be tested or the image acquisition device.

[0022] In some embodiments, the welding quality detection method further includes: before acquiring the first image, moving the product to be tested to a first position, wherein, at the first position, the first welding part is located within the acquisition field of view of the image acquisition device; in response to the product to be tested having moved to the first position, the controller receives a first movement-in-place indication; wherein, the image acquisition device acquires the first image of the first welding part of the product to be tested, including: in response to the first movement-in-place indication, the controller controls the image acquisition device to start acquiring the first image.

[0023] In some embodiments, at the new position, the image acquisition device acquires a second image of the second welding part of the product to be tested, including: in response to the product to be tested or the image acquisition device being moved to the new position, the image acquisition device acquires a second image of the second welding part.

[0024] In some embodiments, in response to the product to be tested or the image acquisition device being moved to the new position, the image acquisition device acquires a second image of the second welding part, including: in response to the product to be tested or the image acquisition device being moved to the new position, the controller receives a second movement-in-place indication; in response to the second movement-in-place indication, the controller controls the image acquisition device to start acquiring the second image.

[0025] In some embodiments, the welding quality detection method further includes: in response to the image acquisition device completing image acquisition of all welding parts to be tested of the product to be tested, moving the product to be tested to a second position; and maintaining the product to be tested in the second position until the determination of the detection result is completed.

[0026] In some embodiments, the welding quality inspection method further includes: moving the product to be inspected from the second position to a next process or a waste discharge station according to the determined inspection result.

[0027] In some embodiments, analyzing the first image and moving the product to be tested or the image acquisition device to a new position are simultaneously performed.

[0028] In some embodiments, said analyzing said second image is performed after said analyzing said first image is completed.

[0029] In some embodiments, the product to be tested is a battery cell, the battery cell includes a top cover and an outer shell, and the first welding position and the second welding position respectively include one or more pre-weld points between the top cover and the outer shell.

[0030] In some embodiments, the arrangement pattern of the pre-welding points of the first welding location and the pre-welding points of the second welding location are the same.

[0031] In some embodiments, the arrangement pattern of the pre-weld points of the second welding location is a subset of the arrangement pattern of the pre-weld points of the first welding location.

[0032] In some embodiments, there are multiple image acquisition devices, and the acquisition fields of the image acquisition devices are arranged according to the arrangement pattern of the pre-welding points of the first welding position.

[0033] In some embodiments, the welding quality inspection method further includes: in response to completion of acquisition of the second image, the transmission device moves the product to be tested or the image acquisition device to a second new position, wherein, at the second new position, a third welding portion of the product to be tested is located within the acquisition field of view of the image acquisition device; at the second new position, the image acquisition device acquires a third image of the third welding portion of the product to be tested;

[0034] The processor analyzes the third image according to the instruction of the controller to determine the welding quality of the third welding part, wherein the controller determines the inspection result of the product to be tested based at least in part on the welding quality of the first welding part and the welding quality of the second welding part, including: the controller determines the inspection result of the product to be tested based at least in part on the welding quality of the first welding part, the welding quality of the second welding part and the welding quality of the third welding part.

[0035] In some embodiments, the first welding location, the second welding location, and the third welding location are distributed at equal intervals.

[0036] In the disclosed embodiment, by adjusting the inspection rhythm of the welding quality inspection system on the battery production line, the controller is configured to separately control the movement of the image acquisition device or the product to be tested and the image analysis during the image acquisition process, so that the movement and analysis are at least partially performed in parallel, thereby optimizing the inspection process of the welding quality inspection system on the battery production line, saving inspection time, and improving inspection efficiency. Within the specified inspection time, the completion of the welding quality inspection task is guaranteed without increasing the number of cameras, thereby controlling the cost of the welding quality inspection system.

[0037] The technical solution of the present disclosure is further described in detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] FIG1 is a schematic diagram illustrating the composition of a welding quality inspection system 100 according to some embodiments of the present disclosure.

[0040] FIG2 is a schematic diagram of the capture field of view of an image capture device and a welding position of a product to be tested according to some embodiments of the present disclosure.

[0041] 3 is a schematic diagram of multiple weld locations between a top cover and a housing of a battery cell according to some embodiments of the present disclosure.

[0042] FIG4 is a flow chart of a welding quality detection method 400 according to some embodiments of the present disclosure.

[0043] 5 and 6 are a timing diagram and a flow chart of welding quality detection according to some embodiments of the present disclosure.

[0044] 7 and 8 are a timing diagram and a flow chart of welding quality detection according to other embodiments of the present disclosure. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0046] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0047] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0048] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0049] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0050] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] As previously mentioned, in battery production lines (hereinafter referred to as "production lines"), the time available for weld quality testing is very limited to minimize the impact on the original production cycle. If the product under test has multiple welds requiring inspection, the time required for weld quality testing will be even greater.

[0052] One solution is to increase the number of image acquisition devices used to capture images of welds, allowing multiple image acquisition devices to capture and process images in parallel. However, increasing the number of image acquisition devices increases costs. Furthermore, when there are a large number of welds, it is practically difficult to add so many image acquisition devices. Furthermore, when welds are densely packed, there may not be enough space around the product to place multiple image acquisition devices in close proximity. Therefore, there is still a need to use a single image acquisition device to inspect at least two welds in sequence. The inspection process for this scenario needs to be optimized to meet the production line's production rhythm requirements and ensure production efficiency.

[0053] In the prior art, when using the same image acquisition device to inspect multiple welds, the process typically proceeds serially. Specifically, the image acquisition device first captures and analyzes images of one weld, then moves on to the next weld. This inspection process is time-consuming and difficult to adapt to the demands of fast production cycles.

[0054] The disclosed embodiments provide a solution for partially parallelizing the inspection process for different weld locations to shorten overall inspection time. Specifically, after the image acquisition device captures an image of the current weld location, the image acquisition device is aligned with the next weld location and the image processing of the current weld location is performed at least partially in parallel.

[0055] To facilitate understanding of the solution, the following first introduces a welding quality detection system according to an embodiment of the present disclosure. The welding quality detection system can be applied to a battery production line.

[0056] Figure 1 is a schematic diagram of the composition of a welding quality detection system 100 according to some embodiments of the present disclosure. The welding quality detection system 100 (hereinafter referred to as system 100) includes an image acquisition device 101, a processor 102, a transmission device 103 and a controller 104. The system 100 can be used to detect the welding quality of welding parts on a product to be tested (not shown). The product to be tested includes but is not limited to battery cells, modules, battery packs or battery products. The product to be tested may include at least two welding parts. A welding part refers to a position on the product to be tested that is processed by a welding process. The welding process includes but is not limited to spot welding, pull welding, ultrasonic welding and laser welding. The welding part can be a welding spot, a welding pad or any other welding pattern.

[0057] Image acquisition device 101 is used to capture images, i.e., take photos, of the welds on the product under test. Image acquisition device 101 may include a CCD (Charge-coupled Device) camera, a CMOS (Complementary Metal-Oxide-Semiconductor) camera, or a CID (Charge Injection Device) camera. Depending on the size of its field of view, image acquisition device 101 can capture images of one or more welds at a time, or multiple image acquisition devices 101 can be combined to capture different portions of a weld. The field of view of image acquisition device 101 refers to the maximum range that image acquisition device 101 can capture.

[0058] Since the image acquisition device 101 has a limited field of view, in order to capture highly clear images to ensure detection accuracy, when the image acquisition device 101 cannot capture all welding parts of the product to be tested at one time, it is necessary to move the image acquisition device 101 or the product to be tested so that the welding part or part of the welding part originally located outside the field of view is moved into the field of view.

[0059] Figure 2 is a schematic diagram illustrating the field of view of an image acquisition device and the weld of a product under test, according to some embodiments of the present disclosure. As shown in Figure 2, image acquisition device 101 is initially aligned with weld 20-A of product under test 20. Weld 20-B is now outside the field of view of image acquisition device 101 (shown by the solid line in the figure). To capture an image of weld 20-B, image acquisition device 101 or product under test 20 must be moved so that weld 20-B is within the field of view of image acquisition device 101 (the figure shows image acquisition device 101 moving, with the moved field of view shown by the dashed line).

[0060] Returning to Figure 1 , processor 102 is configured to receive images of welded locations captured by image acquisition device 101 and perform image recognition on the images to detect weld quality at the corresponding welded locations in the images. Processor 102 may include a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and software stored in associated memory. Processor 102 implements image reception and image recognition by executing software instructions.

[0061] The transmission device 103 is used to move the product to be tested (such as a battery cell, module, battery pack or finished battery) or the image acquisition device 101 so that the image acquisition device 101 can be aligned with a specific welding position on the product to be tested.

[0062] In some embodiments, the transmission device 103 is used to move the product under test, while the image acquisition device 101 does not move. The transmission device 103 includes a conveyor belt, a track, a robotic arm, etc. The product under test moves along with the conveyor belt, track, robotic arm, etc. of the battery production line. The product under test is first moved to position one by the transmission device, so that the image acquisition device 101's field of view can be aligned with welding part A of the product under test and an image of welding part A is acquired. The product under test is then moved to position two, so that the image acquisition device's field of view can be aligned with welding part B of the product under test and an image of welding part B is acquired. This process continues in this manner until image acquisition of all welding parts of the product under test is complete.

[0063] In other embodiments, the transmission device 103 is used to move the image acquisition device 101. Once the product under test enters the initial inspection area, the position of the device is no longer moved. The transmission device 103 includes a robotic arm, a track, etc. The image acquisition device 101 moves with the robotic arm, the track, etc. Similar to the movement of the product under test, the image acquisition device 101 is first moved by the transmission device to position three, so that its field of view can be aligned with weld part A of the product under test, and image acquisition is performed. The device is then moved to position four, so that its field of view can be aligned with weld part B of the product under test, and an image of weld part B is acquired. This process continues in this manner until image acquisition of all weld parts of the product under test is complete.

[0064] In the above embodiments, movement includes translation, rotation or other movement modes.

[0065] The controller 104 is communicatively coupled to the processor 102. The controller 104 sends instructions to the processor 102, instructing it to analyze the captured images of the weld location and determine the weld quality. The controller 104 may also fuse the weld quality determined based on the captured images of multiple weld locations to determine the final inspection result of the product under test. In some embodiments, the controller 104 may also be communicatively coupled to the actuator 103 to control the actuator 103 to move the product under test or the image acquisition device 101. In some embodiments, the controller 104 may also be communicatively coupled to the image acquisition device 101 to control the image acquisition device 101 to begin capturing images of a specific weld location.

[0066] The following describes the welding positions of the products to be tested in some embodiments of the present disclosure by taking the quality inspection of pre-welding of battery cells on a battery production line as an example.

[0067] 3 is a schematic diagram of multiple weld locations between a top cover and a housing of a battery cell according to some embodiments of the present disclosure.

[0068] In some embodiments, as shown in FIG3 , a battery cell 300 includes a top cover 301 and a housing 302. The first and second weld locations each comprise one or more pre-weld points between the top cover 301 and the housing 302. For example, the first weld location is weld location 303-A, and the second weld location is weld location 303-B. Weld location 303-A includes four pre-weld points (weld points A-1 to A-4, as shown in FIG3 ). These four pre-weld points can be imaged simultaneously by one or more image acquisition devices. Weld location 303-B includes four pre-weld points (weld points B-5 to B-8, as shown in FIG3 ). These four pre-weld points can also be imaged simultaneously by one or more image acquisition devices. Before fully welding the top cover 301 and the housing 302 of the battery, pre-welding the two together can improve the stability of the welding process. The quality of the pre-weld points directly affects the quality of the battery cell 300. Therefore, the quality of the pre-weld points at each weld location needs to be tested.

[0069] The number of pre-weld points included in each welding area can be equal or unequal. For example, battery cell 300 has a total of 10 pre-weld points. Welding area 303-A includes 4 pre-weld points (weld points A-1, A-2, A-3, and A-4 as shown in FIG3 ), welding area 303-B includes 4 pre-weld points (weld points B-5, B-6, B-7, and B-8), and welding area 303-C includes 2 pre-weld points (weld points C-9 and C-10).

[0070] In some embodiments, the pre-weld points of the first welding location and the pre-weld points of the second welding location are arranged in the same pattern. For example, as shown in FIG3 , welding location 303-A is the first welding location, welding location 303-B is the second welding location, and welding location 303-A and welding location 303-B each include four pre-weld points, and the arrangement pattern of welding points A-1 to A-4 is the same as that of welding points B-5 to B-8.

[0071] In other embodiments, the arrangement pattern of the pre-weld points in the second welding location is a subset of the arrangement pattern of the pre-weld points in the first welding location. For example, as shown in FIG3 , welding location 303-A is the first welding location, and welding location 303-C is the second welding location. Welding location 303-A includes welding points A-1 to A-4, and welding location 303-C includes welding points C-9 and C-10. The arrangement pattern of welding points C-9 and C-10 is a subset of the arrangement pattern of welding points A-1 to A-4.

[0072] Arranging the pre-weld points at each welding location in a consistent pattern can help the image acquisition device 101 more conveniently capture images of each welding location. For example, when each welding location is captured by a single image acquisition device 101, the location of the pre-weld points at each welding location in the corresponding image can be more easily determined, which helps improve the efficiency of image analysis by the processor 102.

[0073] Furthermore, in some embodiments, multiple image acquisition devices 101 are provided, and the capture fields of view of the image acquisition devices 101 are arranged according to the arrangement pattern of the pre-weld points at the first welding location. In this manner, regardless of whether the arrangement pattern of the pre-weld points at the first welding location is the same as the arrangement pattern of the pre-weld points at the second welding location, or whether the arrangement pattern of the pre-weld points at the second welding location is a subset of the arrangement pattern of the pre-weld points at the first welding location, when capturing images at different welding locations, it is only necessary to adjust the positions of multiple image acquisition devices 101 simultaneously, rather than individually adjusting the capture field of view of each image acquisition device 101 to align with the welding location of the product under test, thereby improving image acquisition efficiency.

[0074] For example, as shown in FIG3 , the first welding part is welding part 303-A, the second welding part is welding part 303-C, and there are four image acquisition devices. The acquisition fields of the four image acquisition devices are arranged according to the arrangement pattern of welding points A-1 to A-4 of welding part 303-A. Then, the four image acquisition devices can acquire images of welding points A-1 to A-4 of part 303-A in their acquisition fields without adjusting their relative positions. Moreover, because the arrangement of welding points C-9 and C-10 is the same as that of welding points A-1 and A-2, images of welding points C-9 and C-10 of part 303-C can also be acquired. This allows for faster acquisition of images of multiple welding parts.

[0075] The above has described in detail the relationship between the various components in the system 100, the functions that can be achieved by each component, and the objects to be tested for welding quality detection, and listed some embodiments in which the battery cell 300 is used as the object to be tested. The following will introduce the welding quality detection method of some embodiments of the present disclosure in conjunction with Figures 4 to 7.

[0076] FIG4 is a flow chart illustrating a welding quality detection method 400 according to some embodiments of the present disclosure. The welding quality detection method 400 (hereinafter referred to as method 400 ) may be performed by the system 100 shown in FIG1 . The method 400 may be used to detect the quality of the pre-weld welding of the battery cell 300 shown in FIG3 .

[0077] In step 401 , the image acquisition device 101 acquires a first image of a first welding portion of a product to be tested.

[0078] The product under test may not initially be located at the first position, but rather at another location (e.g., where the previous production process on the battery production line was completed), causing the first weld portion of the product under test to be outside the field of view of the image acquisition device 101. In this case, the following method can be used to adjust the relative position between the image acquisition device 101 and the product under test before capturing the first image, so that the field of view of the image acquisition device 101 is aligned with the first weld portion.

[0079] In some embodiments, the welding quality inspection method 400 further includes: before capturing the first image, moving the product under test to a first position, where the first weld portion is within the capture field of view of the image capture device 101. In response to the product under test having moved to the first position, the controller 104 receives a first move-to-position indication. Step 401 includes: In response to the first move-to-position indication, the controller 104 controls the image capture device to begin capturing the first image. The first move-to-position indication may be sent to the controller 104 by the image capture device 101 in response to the first weld portion entering the capture field of view or moving to a first preset position within the capture field of view, or may be sent to the controller 104 by a sensor sensing that the product under test has moved to the first position, or may be sent to the controller 104 by a first transmission device for moving the product under test to the first position after completing the movement of the product under test to the first position. The first transmission device may be the transmission device 103 or another transmission device other than the transmission device 103.

[0080] In some embodiments, the image acquisition device 101 may also directly begin acquiring the first image in response to the first welding part entering the acquisition field of view or moving to a first preset position in the acquisition field of view, without receiving an instruction from the controller 104. Alternatively, the image acquisition device 101 may begin acquiring the first image in response to an instruction sent by a receiving sensor or a first transmission device.

[0081] In the above embodiment, moving the product to be tested to the first position can place the first welding part of the product to be tested within the capture field of view of the image acquisition device 101, making it easier for the image acquisition device 101 to capture the first image, ensuring that the first image can clearly reflect the welding quality of the first welding part, and helping to improve the accuracy of welding quality detection.

[0082] In step 403 , in response to the completion of the first image acquisition, the transmission device 103 moves the product to be tested or the image acquisition device 101 to a new position. At the new position, the second welding part of the product to be tested is located within the acquisition field of view of the image acquisition device 101 .

[0083] As described above regarding actuator 103, actuator 103 can move the product under test while image acquisition device 101 remains stationary. Prior to the completion of the first image acquisition, the product under test is located at a first position, where the first weld is within the field of view of image acquisition device 101. Upon completion of the first image acquisition, actuator 103 moves the product under test from the first position to a new position, placing the second weld within the field of view of image acquisition device 101.

[0084] The transmission device 103 can also move the image acquisition device 101, while the product under test is fixed at the first position. In response to the completion of the first image acquisition, the transmission device 103 moves the image acquisition device 101 to a new position. The captured field of view then shifts with the movement of the image acquisition device 101, shifting from covering the first weld area of ​​the product under test to covering the second weld area.

[0085] Both of the above methods can help the image acquisition device 101 to acquire the second image of the second welding part in the subsequent step.

[0086] In some embodiments, step 403 includes: upon completion of the first image acquisition, controller 104 receiving an acquisition completion indication; and in response to the acquisition completion indication, controller 104 controlling actuator 103 to begin moving the product under test or image acquisition device 101. The acquisition completion indication may be sent by image acquisition device 101 to controller 104 in response to completion of the first image acquisition, or may be sent by controller 104 in response to a certain acquisition time elapsed after the start of the first image acquisition.

[0087] The above-mentioned method can avoid moving the product to be tested or the image acquisition device 101 before the first image acquisition is completed, which affects the quality of the first image, and helps to improve the accuracy of the welding quality detection result.

[0088] In step 405, at the new position, the image acquisition device 101 captures a second image of the second weld portion of the product to be tested. Regardless of whether the image acquisition device 101 or the product to be tested is moved to the new position, the second image of the second weld portion can be captured. The second image can be captured immediately upon arrival at the new position or at some point after arrival.

[0089] In some embodiments, step 405 includes the image acquisition device 101 acquiring a second image of the second welding position in response to the product to be tested or the image acquisition device being moved to a new position. That is, the image acquisition device 101 or the product to be tested begins acquiring the second image immediately after being moved to the new position.

[0090] In some embodiments, in response to the product to be tested or the image acquisition device 101 being moved to a new position, the image acquisition device 101 capturing a second image of the second welding position includes the controller 104 receiving a second movement-into-position indication in response to the product to be tested or the image acquisition device 101 being moved to the new position; and in response to the second movement-into-position indication, the controller 104 controlling the image acquisition device 101 to start capturing the second image.

[0091] Similar to the first move-in-place indication, the second move-in-place indication can be sent by the image acquisition device 101 to the controller 104 in response to the second weld part entering its field of view or the second weld part moving to a first preset position within the field of view. Alternatively, the second move-in-place indication can be sent by the image acquisition device 101 to the controller 104 in response to a sensor sensing that the product under test or the image acquisition device 101 has been moved to a new position. Alternatively, the second mover for moving the product under test or the image acquisition device 101 can send the second move-in-place indication to the controller 104 after the second mover has completed moving the product under test or the image acquisition device 101 to the new position. The second transmission device can be the transmission device 103 or another transmission device other than the transmission device 103. The second transmission device and the first transmission device can be the same transmission device or different transmission devices. The second move-in-place indication prevents the transmission device 103 from moving the product under test or the image acquisition device 101 before the second image acquisition is complete, which could affect the quality of the second image, further helping to improve the accuracy of weld quality testing.

[0092] In step 407, processor 102 analyzes the first image according to the instructions of controller 104 to determine the weld quality of the first weld location. The weld quality of the weld location can be classified into two levels: acceptable and unacceptable, or it can be classified into multiple levels as needed, such as excellent, good, fair, and poor. Processor 102 can use software with image analysis capabilities to analyze the first image to determine the weld quality level of the first weld location.

[0093] In step 409 , the processor 102 analyzes the second image according to the instruction of the controller to determine the welding quality of the second welding location.

[0094] In some embodiments, analysis of the second image (i.e., step 409) is performed after analysis of the first image (i.e., step 407) is completed. The analysis of both the first and second images is performed by processor 102. This approach can prevent processor 102 from being affected by the second image while analyzing the first image, which could lead to erroneous analysis results.

[0095] In step 411, the controller 104 determines an inspection result of the product under test based at least in part on the weld quality of the first weld location and the weld quality of the second weld location. Analyzing the first image (i.e., step 407) is performed at least in part in parallel with moving the product under test or the image capture device to a new location (i.e., step 403).

[0096] In some embodiments, analyzing the first image (i.e., step 407) and moving the product under test or image acquisition device 101 to a new location (i.e., step 403) are performed simultaneously. The processor 102 analyzing the first image and the actuator 103 moving the product under test or image acquisition device 101 to a new location are two independent tasks performed independently of each other. Performing these tasks in parallel can further improve weld quality inspection efficiency.

[0097] It will be appreciated that in the above embodiment, the product under test may have more than two welds. After the first image of the first weld is captured, the image capture device 101 or the product under test is moved to a new position so that the second weld is within the capture field of view of the image capture device 101. At the new position, a second image of the second weld is captured. The above steps are repeated until images of all welds on the product under test have been captured. For example, as shown in Figure 3, an image of weld 303-A (the first weld) is captured. Once the image of weld 303-A is captured, an image of weld 303-B (the second weld) is captured. Weld 303-B is the first weld relative to weld 303-C. Once the image of weld 303-B is captured, an image of weld 303-C is captured. At this point, images of all welds on the battery cell 300 have been captured.

[0098] The above method adjusts the inspection rhythm of the welding quality inspection system on the battery production line, allowing the controller to separately control the movement of the image acquisition device or the product to be tested and the image analysis during the image acquisition process, so that the movement and analysis are at least partially performed in parallel, thereby optimizing the inspection process of the welding quality inspection system on the battery production line, saving inspection time, and improving inspection efficiency. Within the specified inspection time, the completion of the welding quality inspection task can be guaranteed without increasing the number of cameras, thereby controlling the cost of the welding quality inspection system.

[0099] As mentioned in the introduction to step 405, the second image can be captured immediately upon arrival at the new position, or at some point thereafter. The following describes several embodiments using the welding quality inspection of the battery cell 300 shown in Figure 3 as a non-limiting example, with different timings for starting the second image capture. A comparative analysis of the impact of the timing of the second image capture on the welding quality inspection process for the product under test is also provided. It should be noted that the inspection method of Figure 4 is also applicable to other products under test besides battery cells 300.

[0100] For ease of description, in the following embodiments, the transmission device 103 moves the battery cell 300 and the image acquisition device 101 is fixed.

[0101] 5 and 6 are a timing diagram and a flow chart of welding quality detection according to some embodiments of the present disclosure.

[0102] In some embodiments, in response to the completion of the analysis of the first image, the image acquisition device 101 acquires a second image of the second welding location. In this case, as shown in FIG5 , when inspecting the welding quality of the battery cell 300 , the following steps 501 to 511 are performed.

[0103] In step 501, controller 104 controls actuator 103 to move battery cell 300 to position 1. At position 1, weld portion 303-A is within the field of view of image acquisition device 101. The process then proceeds to step 502. In some embodiments, if battery cell 300 has already been moved to position 1 before testing begins, step 501 can be omitted. The timing diagram shown in FIG6 shows that the elapsed time is calculated starting from step 502.

[0104] In step 502, in response to the battery cell 300 having moved to position 1, the controller 104 controls the image acquisition device 101 to acquire image 1-303-A at position 1. After step 502 is completed, steps 503 and 504 are at least partially performed in parallel.

[0105] In step 503 , the processor 102 analyzes the image 1 - 303 -A according to the instruction of the controller 104 to determine the welding quality of the welding location 303 -A.

[0106] In step 504, in response to the completion of the acquisition of image 1-303-A, the actuator 103 moves the battery cell 300 to position 2. At position 2, the weld portion 303-B of the battery cell 300 is within the acquisition field of view of the image acquisition device 101. After steps 503 and 504 are completed, the process proceeds to step 505.

[0107] In step 505, in response to the completion of the analysis of image 1-303-A, the image acquisition device 101 acquires image 2-303-B of the welding location 303-B. After step 505 is completed, steps 506 and 507 are at least partially performed in parallel.

[0108] In step 506 , the processor 102 analyzes the image 2 - 303 -B according to the instructions of the controller 104 to determine the weld quality of the weld location 303 -B.

[0109] In step 507, in response to the completion of the acquisition of image 2-303-B, the actuator 103 moves the battery cell 300 to position 3. At position 3, the weld portion 303-C of the battery cell 300 is within the acquisition field of view of the image acquisition device 101. After steps 506 and 507 are completed, the process proceeds to step 508.

[0110] In step 508, in response to the completion of the analysis of image 2-303-B, the image acquisition device 101 acquires image 3-303-C of the welding portion 303-C of the battery cell 300. After step 508 is completed, steps 509 and 510 are at least partially performed in parallel.

[0111] In step 509 , the processor 102 analyzes the image 3 - 303 -C according to the instruction of the controller 104 to determine the welding quality of the welding location 303 -C.

[0112] In step 510, in response to image acquisition device 101 completing image acquisition of all weld locations to be tested on battery cell 300, battery cell 300 is moved to position 4 and maintained at position 4 until the test results are determined. After steps 509 and 510 are completed, the process proceeds to step 511.

[0113] In step 511 , controller 104 determines an inspection result of battery cell 300 based at least in part on the weld quality of weld 303 -A, the weld quality of weld 303 -B, and the weld quality of weld 303 -C.

[0114] Figure 6 shows the start and end times of each step executed by the image acquisition device 101, processor 102, and actuator 103 under the control of controller 104, when inspecting the weld quality of pre-welded joints on a battery cell 300, based on the steps shown in Figure 5. The time it takes for the image acquisition device 101 to capture an image of a weld location is t1, the time it takes for the processor 102 to analyze an image is t2, and the time it takes for the actuator 103 to move the battery cell 300 from position 1 to position 2 or from position 2 to position 3 is t3, where t2 > t3. The time it takes for the actuator 103 to move the battery cell 300 from position 3 to position 4 is t4.

[0115] As shown in FIG6 , based on the steps shown in FIG5 , it takes at least 3t1+3t2 from collecting the image 1-303-A at position 1 to completing the inspection of the 10 welding points of the battery cell.

[0116] In the embodiments of Figures 5 and 6 , the image analysis process takes a long time, t2. If the movement of the battery cell 300 and the image acquisition are performed continuously, that is, the image acquisition device 101 does not need to wait for the processor 102 to analyze the image before acquiring the image, but instead acquires the image immediately after the battery cell 300 moves to the next position, the time consumed by the entire inspection process can be further shortened. The following describes a further improved embodiment with reference to Figures 7 and 8 .

[0117] 7 and 8 are a timing diagram and a flow chart of welding quality detection according to other embodiments of the present disclosure.

[0118] In a further embodiment, in response to moving to a new position, the image acquisition device 101 acquires a second image of the second welding position. In this case, as shown in FIG7 , when inspecting the welding quality of the battery cell 300 , the following steps 701 to 711 are performed.

[0119] In step 701, controller 104 controls actuator 103 to move battery cell 300 to position 1. At position 1, weld portion 303-A is within the field of view of image acquisition device 101. The process then proceeds to step 702. In some embodiments, if battery cell 300 has already been moved to position 1 before testing begins, step 701 may be omitted. The timing diagram shown in FIG8 shows the elapsed time starting from step 702.

[0120] In step 702, in response to the battery cell 300 having moved to position 1, the controller 104 controls the image acquisition device 101 to acquire image 1-303-A at position 1. After step 702 is completed, steps 703 to 707 and steps 708 to 710 are at least partially executed in parallel.

[0121] In step 703, in response to the completion of the acquisition of image 1-303-A, the actuator 103 moves the battery cell 300 to position 2. At position 2, the welding portion 303-B of the battery cell 300 is within the acquisition field of view of the image acquisition device 101. After step 703 is completed, the process proceeds to step 704.

[0122] In step 704, the image acquisition device 101 is controlled to acquire the image 2-303-B of the welding portion 303-B of the battery cell 300. After step 704 is completed, the process jumps to step 705.

[0123] In step 705, in response to the completion of the acquisition of image 2-303-B, the actuator 103 moves the battery cell 300 to position 3. At position 3, the welding portion 303-C of the battery cell 300 is within the acquisition field of view of the image acquisition device 101. After step 705 is completed, the process proceeds to step 706.

[0124] In step 706 , the image acquisition device 101 is controlled to acquire the image 3 - 303 -C of the welding portion 303 -C of the battery cell 300 . After step 706 is completed, the process proceeds to step 707 .

[0125] In step 707 , in response to the image acquisition device 101 completing image acquisition of all weld locations to be tested on the battery cell 300 , the battery cell 300 is moved to position 4 and maintained at position 4 until the test result is determined.

[0126] Steps 708 to 710 are performed at least partially in parallel with steps 703 to 707 .

[0127] In step 708 , the processor 102 analyzes the image 1 - 303 -A according to the instruction of the controller 104 to determine the welding quality of the welding part 303 -A. After step 708 is completed, the process jumps to step 709 .

[0128] In step 709 , the processor 102 analyzes the image 2 - 303 -B according to the instruction of the controller 104 to determine the welding quality of the welding portion 303 -B. After step 708 is completed, the process jumps to step 710 .

[0129] In step 710 , the processor 102 analyzes the image 3 - 303 -C according to the instructions of the controller 104 to determine the welding quality of the welding location 303 -C.

[0130] After steps 707 and 710 are completed, jump to step 711.

[0131] In step 711 , controller 104 determines an inspection result of battery cell 300 based at least in part on the weld quality of weld 303 -A, the weld quality of weld 303 -B, and the weld quality of weld 303 -C.

[0132] Similar to Figure 6 , Figure 8 illustrates the start and end times of each step executed by the image acquisition device 101, processor 102, and actuator 103 under the control of controller 104 when inspecting the weld quality of pre-welded joints of a battery cell 300 based on the steps shown in Figure 7 . The time it takes for the image acquisition device 101 to capture an image of a weld location is t1, the time it takes for the processor 102 to analyze an image is t2, and the time it takes for the actuator 103 to move the battery cell 300 from position 1 to position 2 or from position 2 to position 3 is t3, where t2 > t3. The time it takes for the actuator 103 to move the battery cell 300 from position 3 to position 4 is t4.

[0133] As shown in FIG8 , based on the steps shown in FIG7 , it takes time t1+3t2 from capturing the image 1 - 303 -A at position 1 to completing the inspection of the 10 welding points of the battery cell 300 .

[0134] 6 and 8 , compared with testing the battery cell 300 based on the steps of FIG5 , the steps based on FIG7 can save at least 2t1 time, thereby more effectively saving the welding quality testing time and improving the welding quality testing efficiency.

[0135] In some embodiments, to ensure the normal execution of other processes on the battery production line, a preset time is reserved for the welding quality inspection process. Regardless of the number of welds on the product to be tested, they must be completed within this preset time. In this case, the welding quality inspection method provided by this disclosure can effectively reduce inspection time and improve inspection efficiency.

[0136] In some embodiments, the welding quality detection method provided by the present disclosure can also reduce the number of image acquisition devices while ensuring that the welding quality detection is completed within a preset time.

[0137] For example, assuming the preset time is 5 seconds, t1 = 500 ms, t2 = 1100 ms, and t3 = 300 ms. In this embodiment, if image capture, analysis, and moving the battery cell or image capture device to a new location are performed serially for each weld location of the battery cell 300, it would take at least 3 × (t1 + t2 + t3) = 5.7 seconds, exceeding the preset time. To complete weld quality inspection within the preset time, without changing the inspection logic, the number of image capture devices 101 would need to be increased, which would increase costs.

[0138] Inspecting the pre-weld joints of the battery cell 300 according to the inspection steps shown in FIG5 requires a time of 3t1 + 3t2 = 4.8 seconds. Inspecting the pre-weld joints of the battery cell 300 according to the inspection steps shown in FIG7 requires a time of t1 + 3t2 = 3.8 seconds. In both cases, the time required is less than the preset time, and the welding quality inspection of all pre-weld joints of the battery cell 300 can be completed within the preset time without increasing the number of image acquisition devices.

[0139] It takes 3.8 seconds to inspect the pre-welding points of the battery cell 300 according to the inspection steps shown in Figure 7. If the preset time is 4 seconds, the inspection steps shown in Figure 7 can also complete the inspection of the welding quality of all pre-welding points of the battery cell 300 without increasing the number of acquisition devices.

[0140] In addition to testing the welding quality of each welding part of the product to be tested, it is also necessary to consider subsequent processing of the product to be tested based on the test results.

[0141] In some embodiments, the welding quality inspection method 400 further includes: in response to the image acquisition device 101 completing image acquisition of all welding parts to be tested of the product to be tested, moving the product to be tested to a second position; and maintaining the product to be tested at the second position until the determination of the inspection result is completed.

[0142] Image analysis usually takes more time than image acquisition. After the image acquisition of all welding parts of the product to be tested is completed, it may be necessary to wait for the processor 102 to analyze the image and for the controller 104 to determine the welding quality test results of the product to be tested based on the analysis results of the processor 102. During this period, the product to be tested is moved to a second position and the test results are awaited. This can facilitate further centralized processing of the product to be tested based on the test results. In addition, the current product to be tested does not occupy the capture field of view of the image acquisition device 101 (i.e., the current product to be tested is in a second position different from the first position or the new position), which does not affect the image acquisition of other products to be tested on the same battery production line using the same welding quality inspection system (at least the same image acquisition device 101). This helps to improve the overall welding quality inspection efficiency of the battery production line.

[0143] In some embodiments, the welding quality inspection method 400 further includes: moving the product under test from the second location to a next process step or a waste disposal station based on the determined inspection result. The welding quality inspection result can be classified as either qualified or unqualified. If the inspection result of the product under test is qualified, the product under test can proceed to the next process step. If the inspection result is unqualified, the product under test needs to be moved to a waste disposal station for disposal.

[0144] As can be seen from step 409, the controller 104 determines the test result of the product to be tested based at least in part on the welding quality of the first welding part and the welding quality of the second welding part. According to the requirements of the process, the influence of the welding quality of the welding part on the test result can be flexibly set.

[0145] For example, the welding quality of a welding part can be divided into two levels: qualified and unqualified. If the welding quality of any welding part of the product to be tested is unqualified, the test result of the product to be tested is unqualified.

[0146] In this case, if the welding quality of any welded portion of the product under test fails to meet the quality standards, the controller 104 controls the transmission device 103 to move the product under test from the second position to the waste discharge station. In the above method, the processor 102 may not have fully completed the analysis of the images of the other welded portions of the product under test. However, as long as the controller 104 receives a notification that the welding quality of any welded portion analyzed by the processor 102 fails to meet the quality standards, the controller 104 can determine that the product under test fails without waiting for the image analysis of the other welded portions to complete. To save resources, after determining the test result, the controller 104 immediately notifies the processor 102 to stop analyzing the images of the other welded portions of the current product under test.

[0147] If the product under test has not yet moved to the second position, the controller 104 has already determined that the test result of the current product under test is unqualified. In this case, the image acquisition device 101 may be capturing an image of a welded portion of the product under test, or the transmission device 103 may be moving the product under test. If the processor 102 analyzes and determines that the welding quality of any welded portion of the product under test is unqualified, the controller 104 controls the image acquisition device 101 to stop capturing images of the welded portion of the product under test and controls the transmission device 103 to move the product under test directly from its current position to the waste disposal station.

[0148] If the controller determines that the welding qualities of all welding parts of the product to be tested are qualified, the controller 104 controls the transmission device 103 to move the product to be tested from the second position to the next process.

[0149] For another example, the welding quality of welding parts is divided into four levels: excellent, good, medium and poor according to requirements. When the number of welding parts with poor welding quality in the welding parts of the product to be tested exceeds a certain proportion of the total number of welding parts or the number of welding parts with poor welding quality exceeds a certain value, the inspection result of the product to be tested is unqualified.

[0150] For another example, the processor 102 scores the welding quality of each welding part of the product to be tested, and the contribution of each welding part to the welding quality test result can be adjusted by a weight. When the weighted average score of the welding quality of each welding part of the product to be tested exceeds a preset value, the test result of the product to be tested is qualified.

[0151] In some embodiments, the welding quality inspection method 400 further includes: in response to the completion of the acquisition of the second image, the transmission device 103 moves the product to be tested or the image acquisition device 101 to a second new position. At the second new position, the third welding portion of the product to be tested is located within the acquisition field of view of the image acquisition device 101. At the second new position, the image acquisition device 101 captures a third image of the third welding portion of the product to be tested. The processor 102 analyzes the third image according to the instructions of the controller 104 to determine the welding quality of the third welding portion. Step 409, in which the controller 104 determines the inspection result of the product to be tested based at least in part on the welding quality of the first welding portion and the welding quality of the second welding portion, includes: the controller 104 determines the inspection result of the product to be tested based at least in part on the welding quality of the first welding portion, the welding quality of the second welding portion, and the welding quality of the third welding portion. In the above method, the product to be tested includes three or more welding portions.

[0152] In some embodiments, the first welding location, the second welding location, and the third welding location are equally spaced. For example, as shown in Figure 3, the first welding location is welding location 303-A, the second welding location is welding location 303-B, and the third welding location is welding location 303-C. Welding locations 303-A, welding locations 303-B, and welding locations 303-C are equally spaced. When the spacing between welding locations is the same, the distance of each movement is the same. Therefore, there is no need to adjust the movement distance of the product under test or the image acquisition device 101 based on the distribution of the welding locations. This can save movement time and help improve the efficiency of welding quality inspection. Thus far, various embodiments of the present disclosure have been described in detail. Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A welding quality detection system, applied to a battery production line, comprising: a transmission device, an image acquisition device, a controller and a processor, wherein the controller is in communication with the transmission device, the image acquisition device and the processor, The image acquisition device is used to acquire a first image of a first welding part of the product to be tested; The transmission device is configured to move the product to be tested or the image acquisition device to a new position in response to completion of acquisition of the first image, wherein at the new position, the second welding portion of the product to be tested is located within the acquisition field of view of the image acquisition device; The image acquisition device is further configured to acquire a second image of the second welding portion of the product to be tested at the new position; The controller is configured to instruct the processor to analyze the first image and instruct the processor to analyze the second image; the processor being configured to analyze the first image to determine a weld quality of the first weld location, and to analyze the second image to determine a weld quality of the second weld location, at least partially in parallel with moving the product to be tested or the image acquisition device to a new position, according to an instruction of the controller; The controller is further configured to determine a test result of the product to be tested based at least in part on the welding quality of the first welding position and the welding quality of the second welding position.

2. The welding quality inspection system according to claim 1, wherein: The controller is further configured to receive an acquisition completion indication from the image acquisition device when acquisition of the first image is completed, and control the transmission device to move the product to be tested or the image acquisition device to the new position in response to the acquisition completion indication.

3. The welding quality detection system according to claim 1 or 2, further comprising: a first transmission device, configured to move the product to be tested to a first position before the image acquisition device acquires the first image, wherein, at the first position, the first welding part is located within the acquisition field of view of the image acquisition device; The controller is further configured to receive a first movement-in-place indication in response to the product to be tested having moved to the first position, and control the image acquisition device to start acquiring the first image in response to the first movement-in-place indication.

4. The welding quality inspection system according to any one of claims 1 to 3, wherein: The image acquisition device is further configured to acquire a second image of the second welding position in response to the product to be tested or the image acquisition device being moved to the new position.

5. The welding quality inspection system according to claim 4, wherein: The controller is further configured to receive a second movement-into-position indication in response to the product to be tested or the image acquisition device being moved to the new position, and control the image acquisition device to start acquiring the second image in response to the second movement-into-position indication.

6. The welding quality detection system according to any one of claims 1 to 5, further comprising: The second transmission device is used to move the product to be tested to a second position in response to the image acquisition device completing image acquisition of all welding parts to be tested of the product to be tested, wherein the product to be tested is maintained in the second position until the determination of the detection result is completed.

7. The welding quality inspection system according to claim 6, further comprising: The third transmission device is used to move the product to be tested from the second position to the next process or waste discharge station according to the determined detection result.

8. The welding quality inspection system according to any one of claims 1 to 7, wherein: The product to be tested is a battery cell, which includes a top cover and an outer shell. The first welding position and the second welding position respectively include one or more pre-welding points between the top cover and the outer shell.

9. The welding quality inspection system according to claim 8, wherein: The arrangement pattern of the pre-weld points of the first welding location is the same as the arrangement pattern of the pre-weld points of the second welding location, or the arrangement pattern of the pre-weld points of the first welding location is a subset of the arrangement pattern of the pre-weld points of the second welding location.

10. The welding quality inspection system according to claim 9, wherein: There are multiple image acquisition devices, and the acquisition fields of the image acquisition devices are arranged according to the arrangement pattern of the pre-welding points of the first welding position.

11. The welding quality inspection system according to claim 1 or 2, wherein: The transmission device is further configured to move the product to be tested or the image acquisition device to a second new position in response to completion of acquisition of the second image, wherein at the second new position, the third welding portion of the product to be tested is located within the acquisition field of view of the image acquisition device. The image acquisition device is further configured to acquire a third image of the third welding portion of the product to be tested at the second new position. The controller is further configured to instruct the processor to analyze the third image. The processor is further configured to analyze the third image to determine the welding quality of the third welding position. The controller is further configured to determine a test result of the product to be tested based at least in part on the welding quality of the first welding position, the welding quality of the second welding position, and the welding quality of the third welding position.

12. The welding quality inspection system according to claim 11, wherein: The first welding position, the second welding position and the third welding position are distributed at equal intervals.

13. A welding quality detection method, applied to a welding quality detection system of a battery production line, wherein the welding quality detection system includes a controller, a processor, an image acquisition device, and a transmission device, and the method comprises: The image acquisition device acquires a first image of a first welding portion of the product to be tested; In response to completion of acquisition of the first image, the transmission device moves the product to be tested or the image acquisition device to a new position, wherein at the new position, the second welding portion of the product to be tested is located within the acquisition field of view of the image acquisition device; At the new position, the image acquisition device acquires a second image of the second welding position of the product to be tested; The processor analyzes the first image according to the instruction of the controller to determine the welding quality of the first welding position; The processor analyzes the second image according to the instruction of the controller to determine the welding quality of the second welding position; and The controller determines a test result of the product to be tested based at least in part on the welding quality of the first welding position and the welding quality of the second welding position, The analyzing the first image and the moving the product to be tested or the image acquisition device to a new position are at least partially performed in parallel.

14. The welding quality detection method according to claim 13, wherein: In response to completion of acquisition of the first image, the transmission device moves the product to be tested or the image acquisition device to a new position, including: When the acquisition of the first image is completed, the controller receives an acquisition end indication; In response to the acquisition end indication, the controller controls the transmission device to start moving the product to be tested or the image acquisition device.

15. The welding quality detection method according to claim 13 or 14, further comprising: Before acquiring the first image, the product to be tested is moved to a first position, wherein, at the first position, the first welding part is located within the acquisition field of view of the image acquisition device; In response to the product to be tested being moved to the first position, the controller receives a first movement-to-position indication; The image acquisition device acquires a first image of a first welding portion of the product to be tested, comprising: In response to the first movement-to-position indication, the controller controls the image acquisition device to start acquiring the first image.

16. The welding quality detection method according to any one of claims 13 to 15, wherein: At the new position, the image acquisition device acquires a second image of the second welding portion of the product to be tested, including: In response to the product to be tested or the image acquisition device being moved to the new position, the image acquisition device A second image of the second welding location is acquired.

17. The welding quality detection method according to claim 16, wherein: In response to the product to be tested or the image acquisition device being moved to the new position, the image acquisition device acquires a second image of the second welding position, including: In response to the product to be tested or the image acquisition device being moved to the new position, the controller receives a second movement-to-position indication; In response to the second movement-to-position indication, the controller controls the image acquisition device to start acquiring the second image.

18. The welding quality detection method according to any one of claims 13 to 17, further comprising: In response to the image acquisition device completing image acquisition of all welding locations to be tested of the product to be tested, moving the product to be tested to a second position; as well as The product to be tested is kept in the second position until the determination of the test result is completed.

19. The welding quality detection method according to claim 18, further comprising: According to the determined detection result, the product to be tested is moved from the second position to the next process or waste discharge station.

20. The welding quality inspection method according to any one of claims 13 to 19, wherein: The analyzing of the first image and the moving of the product to be tested or the image acquisition device to a new position are simultaneously started.

21. The welding quality inspection method according to any one of claims 13 to 20, wherein: The analyzing the second image is performed after the analyzing the first image is completed.

22. The welding quality detection method according to any one of claims 13 to 21, wherein: The product to be tested is a battery cell, which includes a top cover and an outer shell. The first welding position and the second welding position respectively include one or more pre-welding points between the top cover and the outer shell.

23. The welding quality detection method according to claim 22, wherein: The arrangement pattern of the pre-welding points of the first welding position and the pre-welding points of the second welding position are the same.

24. The welding quality detection method according to claim 22 or 23, wherein: The arrangement pattern of the pre-weld points of the second welding location is a subset of the arrangement pattern of the pre-weld points of the first welding location.

25. The welding quality detection method according to claim 22, 23 or 24, wherein: There are multiple image acquisition devices, and the acquisition fields of the image acquisition devices are arranged according to the arrangement pattern of the pre-welding points of the first welding position.

26. The welding quality detection method according to any one of claims 13 to 25, further comprising: In response to the completion of the acquisition of the second image, the transmission device moves the product to be tested or the image acquisition device to a second new position, wherein, at the second new position, the third welding part of the product to be tested is located at the within the capture field of view of the image capture device; At the second new position, the image acquisition device acquires a third image of the third welding position of the product to be tested; The processor analyzes the third image according to the instruction of the controller to determine the welding quality of the third welding position, The controller determines the test result of the product to be tested based at least in part on the welding quality of the first welding part and the welding quality of the second welding part, including: The controller determines a test result of the product to be tested based at least in part on a welding quality of the first welding position, a welding quality of the second welding position, and a welding quality of the third welding position.

27. The welding quality detection method according to claim 26, wherein: The first welding position, the second welding position and the third welding position are distributed at equal intervals.

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