Flexible connection system of battery cell assembly and detection method of battery cell assembly

Abstract

The invention discloses a flexible connection system of a battery cell assembly and a detection method of the battery cell assembly, and the system comprises an upper computer which is electrically connected with a first camera and a second camera, and is used for transmitting an image collection signal to the first camera and the second camera when the battery cell assembly arrives at a detection station; the first prism is used for imaging the first side of the battery cell assembly in the third direction; the first camera is used for acquiring an image of the first side, in the third direction, of the battery cell assembly in the first prism based on the image acquisition signal to obtain a first image; the second prism is used for imaging the second side of the battery cell assembly in the third direction; the second camera is used for acquiring an image of the battery cell assembly in the second prism on the second side in the third direction based on the image acquisition signal to obtain a second image; the upper computer is further used for receiving the first image and the second image, determining a first detection result of the cathode end fastener based on the first image and determining a second detection result of the anode end fastener based on the second image, the first detection result is used for representing whether the cathode end fastener is installed in place, and the second detection result is used for representing whether the anode end fastener is installed in place. The second detection result is used for representing whether the anode end fastener is installed in place or not. In this way, whether the fastener is installed in place or not can be detected.

Description

Technical Field

[0001] This application relates to the field of vision detection, and particularly to a soft connection system for a battery cell assembly and a detection method for the battery cell assembly. Background Art

[0002] The top bracket can be used to isolate the battery cell and the tab, support the end face of the battery cell, prevent the battery cell from decarbonization, and prevent the battery cell from squeezing the tab, resulting in short circuit and failure of the battery cell.

[0003] Currently, the top bracket and the top cover can be fixed together by a buckle. However, if the buckle is not installed in place, it will cause damage to the battery cell. Therefore, a solution for detecting whether the buckle is installed in place is needed. Summary of the Invention

[0004] This application provides a soft connection system for a battery cell assembly and a detection method for the battery cell assembly, which can realize the detection of whether the buckle is installed in place.

[0005] In a first aspect, this application provides a soft connection system for a battery cell assembly. The battery cell assembly includes a top cover, a top bracket, and two bare battery cells. The two bare battery cells are spaced apart in a first direction. The top cover and the top bracket are located between the two bare battery cells. The top bracket is disposed on one side of the top cover in a second direction and is fixed to the top cover by a negative terminal buckle and a positive terminal buckle. The negative terminal buckle is located at the edge of the first side of the battery cell assembly in a third direction, and the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction. The first direction, the second direction, and the third direction intersect pairwise. The system includes: a host computer, electrically connected to a first camera and a second camera, for sending an image acquisition signal to the first camera and the second camera when the battery cell assembly reaches the detection station; a first prism, for imaging the first side of the battery cell assembly in the third direction; a first camera, for collecting the image of the first side of the battery cell assembly in the third direction in the first prism based on the image acquisition signal to obtain a first image; a second prism, for imaging the second side of the battery cell assembly in the third direction; a second camera, for collecting the image of the second side of the battery cell assembly in the third direction in the second prism based on the image acquisition signal to obtain a second image; the host computer is further configured to receive the first image and the second image, determine a first detection result of the negative terminal buckle based on the first image, and determine a second detection result of the positive terminal buckle based on the second image. The first detection result is used to indicate whether the negative terminal buckle is installed in place, and the second detection result is used to indicate whether the positive terminal buckle is installed in place.

[0006] Thus, the negative terminal buckle is located at the edge of the first side of the battery cell assembly in the third direction, the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction, the first prism can image the first side of the battery cell assembly in the third direction, the second prism can image the second side of the battery cell assembly in the third direction, the host computer can send an image acquisition signal to the first camera and the second camera when the battery cell assembly reaches the detection station, the first camera can collect the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image, the second camera can collect the image of the second side of the battery cell assembly in the third direction in the second prism based on the image acquisition signal to obtain a second image, and the host computer can determine whether the negative terminal buckle is installed in place based on the first image and determine whether the positive terminal buckle is installed in place based on the second image, so as to realize the detection of whether the buckle is installed in place.

[0007] In some embodiments, the system further includes: a light source controller electrically connected to the host computer, the first light source module, and the second light source module respectively; the host computer is configured to send a brightness control signal to the light source controller when the battery cell assembly reaches the detection station; the light source controller is configured to adjust the brightness of the first light source module and the second light source module based on the brightness control signal; the first light source module is configured to illuminate the edge of the first side of the battery cell assembly in the third direction; the first camera is configured to collect the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image when the first side of the battery cell assembly in the third direction is illuminated by the first light source module; the second light source module is configured to illuminate the edge of the second side of the battery cell assembly in the third direction; the second camera is configured to collect the image of the second side of the battery cell assembly in the third direction in the second prism to obtain a second image when the second side of the battery cell assembly in the third direction is illuminated by the second light source module.

[0008] In this way, by using the first light source module to illuminate the edge of the first side of the battery cell assembly in the third direction and using the second light source module to illuminate the edge of the second side of the battery cell assembly in the third direction, it is convenient to collect clearer first and second images.

[0009] In some embodiments, the system further includes: a first diffuser plate, located between the light-emitting side of the first light source module and the first side of the battery cell assembly in the third direction, for diffusely reflecting the first light emitted by the first light source module to form second light; a first camera for collecting an image of the first side of the battery cell assembly in the third direction in the first prism when the first side of the battery cell assembly in the third direction is irradiated by the second light, to obtain a first image; a second diffuser plate, located between the light-emitting side of the second light source module and the second side of the battery cell assembly in the third direction, for diffusely reflecting the third light emitted by the second light source module to form fourth light; a second camera for collecting an image of the second side of the battery cell assembly in the third direction in the second prism when the second side of the battery cell assembly in the third direction is irradiated by the fourth light, to obtain a second image.

[0010] In this way, by diffusely reflecting the light emitted by the first light source module through the first diffuser plate and the light emitted by the second light source module through the second diffuser plate, low-angle diffuse lighting is formed, which can avoid the interference between the lights of the two light source modules and the interference of other lights, thereby enhancing the gray value contrast between the top cover and the top bracket and facilitating the accurate detection of whether the cathode terminal buckle and the anode buckle are installed in place.

[0011] In some embodiments, the first prism includes a first reflective area for reflecting the fifth light reflected by the first side of the battery cell assembly in the third direction to the first camera; the second prism includes a second reflective area for reflecting the sixth light reflected by the second side of the battery cell assembly in the third direction to the second camera.

[0012] In this way, by using the first prism to reflect the first side of the battery cell assembly in the third direction to the first camera and the second prism to reflect the second side of the battery cell assembly in the third direction to the second camera, the space occupied by the flexible connection system of the battery cell assembly can be reduced, the space utilization rate can be saved, so that the detection of whether the buckle is installed in place can be realized in a smaller space, and the application scenarios of the flexible connection system of the battery cell assembly are also increased.

[0013] In some embodiments, the first light emitted by the first light source module forms second light after being diffusely reflected by the first diffuser plate, and the second light is projected onto the first side of the battery cell assembly in the third direction; the first camera is used to collect the position of the first side of the battery cell assembly in the third direction irradiated by the second light to obtain a first image; the third light emitted by the second light source module forms fourth light after being diffusely reflected by the second diffuser plate, and the fourth light is projected onto the second side of the battery cell assembly in the third direction; the second camera is used to collect the position of the second side of the battery cell assembly in the third direction irradiated by the fourth light to obtain a second image.

[0014] In this way, the first diffuser plate diffuses the light emitted by the first light source module, and the second diffuser plate diffuses the light emitted by the second light source module, forming low-angle diffused lighting. This can avoid the interference between the lights of the two light source modules and the interference of other lights, thereby enhancing the gray value contrast between the top cover and the top bracket, facilitating the accurate detection of whether the cathode terminal buckle and the anode buckle are properly installed.

[0015] In some embodiments, the system further includes: a lower computer, electrically connected to the upper computer, and configured to send a trigger signal to the upper computer when the battery cell assembly reaches the detection station and both the first camera and the second camera are ready; the upper computer is configured to send image acquisition signals to the first camera and the second camera in response to the trigger signal.

[0016] In this way, it is possible to determine whether the battery cell assembly is in place and whether the first camera and the second camera are ready through the lower computer, so as to accurately trigger the upper computer to control other modules, thereby successfully completing the vision inspection.

[0017] In some embodiments, the upper computer is further configured to send an exposure time control signal to the first camera and the second camera; the first camera is further configured to adjust its own exposure time based on the exposure time control signal and acquire a first image based on the adjusted exposure time; the second camera is further configured to adjust its own exposure time based on the exposure time control signal and acquire a second image based on the adjusted exposure time.

[0018] In this way, by controlling the exposure time of the first camera and the second camera through the upper computer, the acquired images can better meet the user's requirements.

[0019] In some embodiments, the lower computer is further configured to send the identifier of the battery cell assembly to the upper computer; the upper computer is further configured to associate the detection result with the identifier of the battery cell assembly, and the detection result includes a first detection result and a second detection result; the lower computer is further configured to find the detection result based on the identifier of the battery cell assembly.

[0020] In this way, by associating the identifier of the battery cell assembly with the detection result, it is convenient to index and read the detection result of the battery cell assembly.

[0021] In a second aspect, the present application provides a method for detecting a battery cell assembly. The battery cell assembly includes a top cover, a top bracket, and two bare battery cells. The two bare battery cells are spaced apart in a first direction. The top cover and the top bracket are located between the two bare battery cells. The top bracket is disposed on one side of the top cover in a second direction and is fixed to the top cover by a negative terminal buckle and a positive terminal buckle. The negative terminal buckle is located at the edge of the first side of the battery cell assembly in a third direction, and the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction. The first direction, the second direction, and the third direction intersect pairwise. The system includes: when the battery cell assembly reaches the detection station, the host computer sends an image acquisition signal to the first camera and the second camera; using a first prism to image the first side of the battery cell assembly in the third direction; based on the image acquisition signal, the first camera acquires the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image; using a second prism to image the second side of the battery cell assembly in the third direction; based on the image acquisition signal, the second camera acquires the image of the second side of the battery cell assembly in the third direction in the second prism to obtain a second image; the host computer receives the first image and the second image, determines a first detection result of the negative terminal buckle based on the first image, and determines a second detection result of the positive terminal buckle based on the second image. The first detection result is used to indicate whether the negative terminal buckle is installed in place, and the second detection result is used to indicate whether the positive terminal buckle is installed in place.

[0022] Thus, the negative terminal buckle is located at the edge of the first side of the battery cell assembly in the third direction, and the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction. The first prism can image the first side of the battery cell assembly in the third direction, and the second prism can image the second side of the battery cell assembly in the third direction. When the battery cell assembly reaches the detection station, the host computer can send an image acquisition signal to the first camera and the second camera. The first camera can acquire the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image, and the second camera can, based on the image acquisition signal, acquire the image of the second side of the battery cell assembly in the third direction in the second prism to obtain a second image. The host computer can determine whether the negative terminal buckle is installed in place based on the first image and determine whether the positive terminal buckle is installed in place based on the second image, thereby realizing the detection of whether the buckle is installed in place.

[0023] In some embodiments, when the first detection result indicates that the negative terminal buckle is not installed in place, the first detection result further includes the reason why the negative terminal buckle is not installed in place; the reason includes any one of the single-sided buckle not being buckled, the double-sided buckle not being buckled, and the buckle being placed in the reverse direction.

[0024] In this way, not only can it be determined whether the cathode buckle is installed in place, but also in the case where the cathode buckle is not installed in place, the reason for the cathode buckle not being installed in place can be determined.

[0025] In some embodiments, determining a first detection result of the cathode end buckle based on a first image includes: using a buckle detection model to perform cathode end buckle detection on the first image to obtain a first detection result.

[0026] In this way, the cathode end buckle can be quickly and accurately detected by an Artificial Intelligence (AI) algorithm.

[0027] In some embodiments, the buckle detection model includes an object detection network, a semantic segmentation network, and a result determination network; using the buckle detection model to perform cathode end buckle detection on the first image to obtain a first detection result includes: using the object detection network to perform object detection on the first image to obtain a first region corresponding to the battery cell assembly; using the semantic segmentation network to perform semantic segmentation on the first image based on the first region to obtain a mask image; using the result determination network to determine the first detection result based on the width of a preset position in the first region of the mask image.

[0028] In this way, first determine the first region through object detection, then obtain the mask image using the semantic segmentation network, and then perform result determination based on the width of the preset position, so that the first detection result can be quickly and accurately determined.

[0029] In some embodiments, the preset positions include a first position, a second position, and a third position. The first position and the third position are the positions where the cathode end buckle is located, and the second position is between the first position and the second position; using the result determination network to determine the first detection result based on the width of the preset position in the first region of the mask image includes: when the widths of the first position, the second position, and the third position are all equal to a first threshold, determining that the first detection result indicates that the cathode end buckle is installed in place; when the width of the first position is greater than the first threshold and the width of the third position is equal to the first threshold, or when the width of the first position is equal to the first threshold and the width of the third position is greater than the first threshold, determining that the first detection result indicates that the cathode end buckle is not installed in place, and the reason is that the unilateral buckle is not buckled; when the widths of the first position, the second position, and the third position are all greater than a second threshold, determining that the first detection result indicates that the cathode end buckle is not installed in place, and the reason is that the bilateral buckle is not buckled, where the second threshold is greater than the first threshold; when the widths of the first position and the third position are both greater than the first threshold and less than the second threshold, and the width of the second position is greater than the second threshold, determining that the first detection result indicates that the cathode end buckle is not installed in place, and the reason is that the buckle is placed in the reverse direction.

[0030] In this way, through the above process, it is possible to accurately determine whether the negative terminal fastener is installed in place. If it is not installed in place, it is also possible to accurately determine the reason for the failure to be installed in place, avoiding overkill or missed killing during the detection of the battery cell assembly.

[0031] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specifically gives the specific implementation manners of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0033] Figure 1 is one of the schematic diagrams of a battery cell assembly provided by some embodiments of this application;

[0034] Figure 2 is another schematic diagram of a battery cell assembly provided by some embodiments of this application;

[0035] Figure 3 is one of the schematic diagrams of a flexible connection system of a battery cell assembly provided by some embodiments of this application;

[0036] Figure 4 is another schematic diagram of a flexible connection system of a battery cell assembly provided by some embodiments of this application;

[0037] Figure 5 is one of the flowcharts of a method for detecting a battery cell assembly provided by some embodiments of this application;

[0038] Figure 6 is another flowchart of a method for detecting a battery cell assembly provided by some embodiments of this application.

[0039] In the drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] Hereinafter, embodiments of the technical solution of this application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solution of this application more clearly, and therefore are only examples and cannot be used to limit the protection scope of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only 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 description of the drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0043] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0045] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0046] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0047] As described in the background art, in the soft connection process of the battery cell assembly, the protection measure of pasting polyethylene terephthalate (PET) glue was used before, and recently, the top bracket was used as the protection measure. The top bracket and the top cover can be fixed through the buckle. However, if the buckle is not installed in place, it will damage the battery cell. Based on this, a step of detecting whether the buckle is installed in place can be added to the soft connection process of the battery cell assembly. Therefore, a solution for detecting whether the buckle is installed in place is needed.

[0048] In view of the above technical problems, the present application provides a soft connection system for a battery cell assembly and a detection method for the battery cell assembly. The negative terminal buckle is located at the edge of the first side of the battery cell assembly in the third direction, and the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction. The first prism can image the first side of the battery cell assembly in the third direction, and the second prism can image the second side of the battery cell assembly in the third direction. When the battery cell assembly reaches the detection station, the upper computer can send an image acquisition signal to the first camera and the second camera. The first camera can collect the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image, and the second camera can collect the image of the second side of the battery cell assembly in the third direction in the second prism based on the image acquisition signal to obtain a second image. The upper computer can determine whether the negative terminal buckle is installed in place based on the first image and determine whether the positive terminal buckle is installed in place based on the second image, so as to realize the detection of whether the buckle is installed in place.

[0049] The soft connection system for a battery cell assembly and the detection method for the battery cell assembly provided by the embodiments of the present application will be introduced in detail below.

[0050] The present application provides a soft connection system for a battery cell assembly, as Figure 1 shown, the battery cell assembly 100 may include: a top cover 110, a top bracket 120, and two bare battery cells. The two bare battery cells may be spaced apart in the first direction. The top cover 110 and the top bracket 120 may be located between the two bare battery cells. The top bracket 120 may be disposed on one side of the top cover 110 in the second direction and fixed to the top cover 110 through a negative terminal buckle and a positive terminal buckle, as Figure 2 shown, the negative terminal buckle 130 may be located at the edge of the first side of the battery cell assembly 100 in the third direction, and the positive terminal buckle 140 may be located at the edge of the second side of the battery cell assembly 100 in the third direction. The first direction, the second direction, and the third direction may intersect pairwise.

[0051] As Figure 3 shown, the soft connection system of the battery cell assembly may include: an upper computer (not shown in the figure), a first prism 310, a first camera 320, a second prism 330, and a second camera 340.

[0052] Among them, the host computer can be electrically connected to the first camera 320 and the second camera 340, and can be used to send image acquisition signals to the first camera 320 and the second camera 340 when the battery cell assembly 100 reaches the detection station;

[0053] The first prism 310 can be used to image the first side of the battery cell assembly 100 in the third direction;

[0054] The first camera 320 can be used to collect the image of the first side of the battery cell assembly 100 in the third direction in the first prism 310 based on the image acquisition signal to obtain a first image;

[0055] The second prism 330 can be used to image the second side of the battery cell assembly 100 in the third direction;

[0056] The second camera 340 can be used to collect the image of the second side of the battery cell assembly 100 in the third direction in the second prism 330 based on the image acquisition signal to obtain a second image;

[0057] The host computer can also be used to receive the first image and the second image, determine a first detection result of the negative terminal buckle based on the first image, and determine a second detection result of the positive terminal buckle based on the second image. The first detection result can be used to characterize whether the negative terminal buckle is installed in place, and the second detection result can be used to characterize whether the positive terminal buckle is installed in place.

[0058] Here, the first direction, the second direction, and the third direction can be perpendicular to each other pairwise.

[0059] Both the first camera 320 and the second camera 340 can be 2D area array cameras. Both the first camera 320 and the second camera 340 can take pictures in a fixed-shot or flying-shot manner to save CT.

[0060] The top bracket 120, the negative terminal buckle 130, and the positive terminal buckle 140 can all be made of polycarbonate (PC) transparent material.

[0061] The negative terminal buckle 130 and the positive terminal buckle 140 can have a foolproof design to prevent the top bracket 120 from being installed reversely. Specifically, it can be designed that when the top bracket 120 is installed reversely, the negative terminal buckle 130 and the positive terminal buckle 140 cannot be installed in place. For example, there can be two negative terminal buckles 130 and two positive terminal buckles 140, and the distance between the two negative terminal buckles 130 is different from the distance between the two positive terminal buckles 140. In this way, when the top bracket 120 is installed reversely, neither the negative terminal buckle 130 nor the positive terminal buckle 140 can be installed in place.

[0062] Specifically, when the upper computer determines that the battery cell assembly 100 has reached the detection station, the upper computer may send an image acquisition signal to the first camera 320 and the second camera 340. The first prism 310 may image the first side of the battery cell assembly 100 in the third direction. The first camera 320 may, based on the image acquisition signal, acquire the image of the first side of the battery cell assembly 100 in the third direction in the first prism 310 to obtain a first image. The second prism 330 may image the second side of the battery cell assembly 100 in the third direction. The second camera 340 may, based on the image acquisition signal, acquire the image of the second side of the battery cell assembly 100 in the third direction in the second prism 330 to obtain a second image. Then, the upper computer may receive the first image and the second image, determine a first detection result of the negative terminal buckle 130 based on the first image, and determine a second detection result of the positive terminal buckle 140 based on the second image.

[0063] In some embodiments of the present application, as Figure 3 shown, the first prism 310 may include a first reflection area, and the first reflection area may be configured to reflect the fifth light ray reflected by the first side of the battery cell assembly 100 in the third direction to the first camera 320;

[0064] The second prism 330 may include a second reflection area, and the second reflection area may be configured to reflect the sixth light ray reflected by the second side of the battery cell assembly 100 in the third direction to the second camera 340.

[0065] Exemplarily, the first prism 310 and the second prism 330 may be 45° prisms, and the first reflection area and the second reflection area are oppositely arranged in the third direction. The first camera 320 and the second camera 340 are spaced apart in the third direction. The first camera 320 and the first prism 310 are spaced apart in the second direction, and the lens of the first camera 320 faces the first prism 310. The second camera 340 and the second prism 330 are spaced apart in the second direction, and the lens of the second camera 340 faces the second prism 330.

[0066] In this way, by using the first prism to reflect the first side of the battery cell assembly in the third direction to the first camera, and using the second prism to reflect the second side of the battery cell assembly in the third direction to the second camera, the space occupied by the flexible connection system of the battery cell assembly can be reduced, the space utilization rate can be saved, so that the detection of whether the buckle is installed in place can be realized in a smaller space, and the application scenarios of the flexible connection system of the battery cell assembly are also increased.

[0067] Thus, the negative terminal buckle is located at the edge of the first side of the battery cell assembly in the third direction, the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction, the first prism can image the first side of the battery cell assembly in the third direction, the second prism can image the second side of the battery cell assembly in the third direction, the host computer can send an image acquisition signal to the first camera and the second camera when the battery cell assembly reaches the detection station, the first camera can collect the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image, the second camera can collect the image of the second side of the battery cell assembly in the third direction in the second prism based on the image acquisition signal to obtain a second image, and the host computer can determine whether the negative terminal buckle is installed in place based on the first image and determine whether the positive terminal buckle is installed in place based on the second image, so as to realize the detection of whether the buckle is installed in place.

[0068] In some embodiments of the present application, as Figure 3 shown, the system may further include: a light source controller (not shown in the figure), a first light source module 350, and a second light source module 360.

[0069] Wherein, the light source controller can be electrically connected to the host computer, the first light source module 350, and the second light source module 360 respectively;

[0070] The host computer can be used to send a brightness control signal to the light source controller when the battery cell assembly 100 reaches the detection station;

[0071] The light source controller can be used to adjust the brightness of the first light source module 350 and the second light source module 360 based on the brightness control signal;

[0072] The first light source module 350 can be used to illuminate the edge of the first side of the battery cell assembly 100 in the third direction;

[0073] The first camera 320 can be used to collect the image of the first side of the battery cell assembly 100 in the third direction in the first prism 310 to obtain a first image when the first side of the battery cell assembly 100 in the third direction is illuminated by the first light source module 350;

[0074] The second light source module 360 can be used to illuminate the edge of the second side of the battery cell assembly 100 in the third direction;

[0075] The second camera 340 can be used to collect the image of the second side of the battery cell assembly 100 in the third direction in the second prism 330 to obtain a second image when the second side of the battery cell assembly 100 in the third direction is illuminated by the second light source module 360.

[0076] Here, the first light source module 350 and the second light source module 360 can be set to be constantly on. The light emitted by the first light source module 350 and the second light source module 360 can both be white strip lights. The distance between the first light source module 350 and the battery cell assembly 100 can be set according to the effect of the image collected by the first camera 320. The distance between the second light source module 360 and the battery cell assembly 100 can be set according to the effect of the image collected by the second camera 340.

[0077] Specifically, when the battery cell assembly 100 reaches the detection station, the host computer can send a brightness control signal to the light source controller. The light source controller can adjust the brightness of the first light source module 350 and the second light source module 360 based on the brightness control signal. The first light source module 350 can illuminate the edge part of the first side of the battery cell assembly 100 in the third direction. When the first side of the battery cell assembly 100 in the third direction is illuminated by the first light source module 350, the first camera 320 can collect the imaging of the first side of the battery cell assembly 100 in the third direction in the first prism 310 to obtain a first image. The second light source module 360 can illuminate the edge part of the second side of the battery cell assembly 100 in the third direction. When the second side of the battery cell assembly 100 in the third direction is illuminated by the second light source module 360, the second camera 340 can collect the imaging of the second side of the battery cell assembly 100 in the third direction in the second prism 330 to obtain a second image.

[0078] Exemplarily, the first light source module 350 and the second light source module 360 are spaced apart in the third direction. The edge part of the first side of the battery cell assembly 100 in the third direction is spaced apart from the first light source module 350 in the second direction, and the light-emitting side of the first light source module 350 faces the edge part of the first side of the battery cell assembly 100 in the third direction. The edge part of the second side of the battery cell assembly 100 in the third direction is spaced apart from the second light source module 360 in the second direction, and the light-emitting side of the second light source module 360 faces the edge part of the second side of the battery cell assembly 100 in the third direction.

[0079] In this way, by using the first light source module to illuminate the edge part of the first side of the battery cell assembly in the third direction and using the second light source module to illuminate the edge part of the second side of the battery cell assembly in the third direction, it is convenient to collect clearer first and second images.

[0080] In some embodiments of the present application, the system may further include: a first diffuser plate and a second diffuser plate.

[0081] Wherein, the first diffuser plate can be located between the light-emitting side of the first light source module and the first side of the battery cell assembly in the third direction, and can be used to diffusely reflect the first light emitted by the first light source module to form a second light;

[0082] The first camera can be used to collect the imaging of the first side of the battery cell assembly in the third direction in the first prism when the first side of the battery cell assembly in the third direction is irradiated by the second light, so as to obtain a first image;

[0083] The second diffuser plate can be located between the light emitting side of the second light source module and the second side of the battery cell assembly in the third direction, and can be used to diffusely reflect the third light emitted by the second light source module to form a fourth light;

[0084] The second camera can be used to collect the imaging of the second side of the battery cell assembly in the third direction in the second prism when the second side of the battery cell assembly in the third direction is irradiated by the fourth light, so as to obtain a second image.

[0085] Specifically, the first diffuser plate can diffusely reflect the first light emitted by the first light source module to form a second light, and the second light irradiates the first side of the battery cell assembly in the third direction to form low-angle diffuse lighting. Then, the first camera can collect the imaging of the first side of the battery cell assembly in the third direction in the first prism under the illumination of the second light to obtain a first image.

[0086] The second diffuser plate can diffusely reflect the third light emitted by the second light source module to form a fourth light, and the fourth light irradiates the second side of the battery cell assembly in the third direction to form low-angle diffuse lighting. Then, the second camera can collect the imaging of the second side of the battery cell assembly in the third direction in the second prism under the illumination of the fourth light to obtain a second image.

[0087] In this way, by diffusely reflecting the light emitted by the first light source module through the first diffuser plate and diffusely reflecting the light emitted by the second light source module through the second diffuser plate to form low-angle diffuse lighting, the interference between the lights of the two light source modules can be avoided, and the interference of other lights can also be avoided, so as to enhance the gray value contrast between the top cover and the top bracket, facilitating the accurate detection of whether the cathode terminal buckle and the anode buckle are installed in place.

[0088] In some embodiments of the present application, as Figure 3 shown, the first light emitted by the first light source module 350 is diffusely reflected by the first diffuser plate to form a second light, and the second light is projected onto the first side of the battery cell assembly 100 in the third direction;

[0089] The first camera 320 can be used to collect the position of the first side of the battery cell assembly 100 irradiated by the second light in the third direction to obtain a first image;

[0090] The third light ray emitted by the second light source module 360 is diffusely reflected by the second diffuser to form a fourth light ray, and the fourth light ray is projected onto the second side of the battery cell assembly 100 in the third direction;

[0091] The second camera 340 can be used to collect the position of the second side of the battery cell assembly 100 in the third direction irradiated by the fourth light ray, and obtain a second image.

[0092] Specifically, the first light ray emitted by the first light source module 350 can be diffusely reflected by the first diffuser to form a second light ray, and the second light ray can be projected onto the first side of the battery cell assembly 100 in the third direction to form low-angle diffuse illumination. Then, the first camera 320 can collect the position of the first side of the battery cell assembly 100 in the third direction irradiated by the second light ray, and obtain a first image.

[0093] The third light ray emitted by the second light source module 360 can be diffusely reflected by the second diffuser to form a fourth light ray, and the fourth light ray can be projected onto the second side of the battery cell assembly 100 in the third direction to form low-angle diffuse illumination. Then, the second camera 340 can collect the position of the second side of the battery cell assembly 100 in the third direction irradiated by the fourth light ray, and obtain a second image.

[0094] In this way, by diffusely reflecting the light ray emitted by the first light source module through the first diffuser and diffusely reflecting the light ray emitted by the second light source module through the second diffuser to form low-angle diffuse illumination, the interference between the light rays of the two light source modules can be avoided, and the interference of other light rays can also be avoided. Thus, the gray value contrast between the top cover and the top bracket can be enhanced, facilitating the accurate detection of whether the cathode terminal buckle and the anode buckle are properly installed.

[0095] In some embodiments of the present application, if there is sufficient space, the first prism and the second prism may not be used. Specifically, as Figure 4 shown, the first camera 320 and the second camera 340 are spaced apart in the third direction, the lens of the first camera 320 is disposed opposite to the lens of the second camera 340, the battery cell assembly 100 is located between the first camera 320 and the second camera 340, the lens of the first camera 320 faces the edge portion of the first side of the battery cell assembly 100 in the third direction, and the lens of the second camera 340 faces the edge portion of the second side of the battery cell assembly 100 in the third direction. The settings of the first light source module 350 and the second light source module 360 can refer to other embodiments.

[0096] In some embodiments of the present application, the system may further include: a lower computer.

[0097] Among them, the lower computer can be electrically connected to the upper computer and can be used to send a trigger signal to the upper computer when the battery cell assembly reaches the detection station and both the first camera and the second camera are ready;

[0098] The upper computer can be used to send image acquisition signals to the first camera and the second camera in response to the trigger signal.

[0099] Here, the lower computer can be a controller, specifically a Programmable Logic Controller (PLC). The upper computer can be a vision upper computer.

[0100] Specifically, when the battery cell assembly reaches the detection station, the PLC can send a signal indicating its arrival to the upper computer. When both the first camera and the second camera are ready, the upper computer can send a signal indicating successful reset to the PLC. Then, the PLC can send a trigger signal to the upper computer, and the upper computer can, in response to this trigger signal, send image acquisition signals to the first camera and the second camera.

[0101] In addition, after the first camera and the second camera complete image acquisition, the upper computer can also send a signal indicating that the photographing is completed to the PLC. After the first camera and the second camera are successfully reset, the upper computer can also send a signal indicating successful reset to the PLC.

[0102] In this way, it is possible to determine whether the battery cell assembly is in place and whether the first camera and the second camera are ready through the lower computer, so as to accurately trigger the upper computer to control other modules, thereby successfully completing the vision detection.

[0103] In some embodiments of the present application, the upper computer can also be used to send exposure time control signals to the first camera and the second camera;

[0104] The first camera can also be used to adjust its own exposure time based on the exposure time control signal and acquire a first image based on the adjusted exposure time;

[0105] The second camera can also be used to adjust its own exposure time based on the exposure time control signal and acquire a second image based on the adjusted exposure time.

[0106] Specifically, the upper computer can send exposure time control signals to the first camera and the second camera in response to the trigger signal, so that the first camera adjusts its own exposure time based on the exposure time control signal and acquires a first image based on the adjusted exposure time, and the second camera adjusts its own exposure time based on the exposure time control signal and acquires a second image based on the adjusted exposure time.

[0107] In this way, by controlling the exposure times of the first camera and the second camera through the host computer, the acquired images can better meet the user's requirements.

[0108] In some embodiments of the present application, the slave computer can also be used to send the identification of the battery cell assembly to the host computer;

[0109] The host computer can also be used to associate the detection result with the identification of the battery cell assembly;

[0110] The slave computer can also be used to find the detection result based on the identification of the battery cell assembly.

[0111] Here, the detection result can include a first detection result and a second detection result.

[0112] The identification of the battery cell assembly can be a battery cell code or a serial number (SN) of the battery cell assembly.

[0113] Specifically, the PLC can also send the battery cell code of the battery cell assembly read by the code reader to the host computer when receiving the battery cell code. After receiving the battery cell code, the host computer can associate the detection result of the battery cell assembly with the battery cell code. In this way, the slave computer can find the detection result of the battery cell assembly based on the battery cell code of the battery cell assembly.

[0114] In this way, by associating the identification of the battery cell assembly with the detection result, it is convenient to index and read the detection result of the battery cell assembly.

[0115] The embodiments of the present application also provide a method for detecting a battery cell assembly. The execution subject of the method for detecting the battery cell assembly can be the soft connection system of the battery cell assembly. The method for detecting the battery cell assembly provided by the embodiments of the present application will be introduced below.

[0116] Figure 5 It is a schematic flow chart of the method for detecting a battery cell assembly provided by some embodiments of the present application.

[0117] As Figure 5 shown, the method for detecting the battery cell assembly can include the following steps:

[0118] S510, when the battery cell assembly reaches the detection station, the host computer sends an image acquisition signal to the first camera and the second camera;

[0119] S520, using the first prism to image the first side of the battery cell assembly in the third direction;

[0120] S530, the first camera acquires the image of the first side of the battery cell assembly in the third direction in the first prism based on the image acquisition signal to obtain a first image;

[0121] S540, image the second side of the battery cell assembly in the third direction using a second prism;

[0122] S550, collect the image of the second side of the battery cell assembly in the third direction in the second prism by a second camera based on an image acquisition signal to obtain a second image;

[0123] S560, receive the first image and the second image by a host computer, determine a first detection result of the negative terminal buckle based on the first image, and determine a second detection result of the positive terminal buckle based on the second image.

[0124] Wherein, the battery cell assembly may include a top cover, a top bracket, and two bare battery cells. The two bare battery cells may be spaced apart in a first direction. The top cover and the top bracket may be located between the two bare battery cells. The top bracket may be disposed on one side of the top cover in a second direction and fixed to the top cover by a negative terminal buckle and a positive terminal buckle. The negative terminal buckle may be located at the edge of the first side of the battery cell assembly in the third direction. The positive terminal buckle may be located at the edge of the second side of the battery cell assembly in the third direction. The first direction, the second direction, and the third direction may intersect pairwise.

[0125] The first detection result may be used to characterize whether the negative terminal buckle is installed in place, and the second detection result may be used to characterize whether the positive terminal buckle is installed in place.

[0126] For the specific processes of S510 - S560, reference may be made to the above - mentioned embodiments, which will not be elaborated here.

[0127] Thus, the negative terminal buckle is located at the edge of the first side of the battery cell assembly in the third direction, and the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction. The first prism can image the first side of the battery cell assembly in the third direction, and the second prism can image the second side of the battery cell assembly in the third direction. When the battery cell assembly reaches the detection station, the host computer can send an image acquisition signal to the first camera and the second camera. The first camera can collect the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image. The second camera can collect the image of the second side of the battery cell assembly in the third direction in the second prism based on the image acquisition signal to obtain a second image. The host computer can determine whether the negative terminal buckle is installed in place based on the first image and determine whether the positive terminal buckle is installed in place based on the second image, thereby realizing the detection of whether the buckle is installed in place.

[0128] In some embodiments of the present application, when the first detection result characterizes that the negative terminal buckle is not installed in place, the first detection result may further include the reason why the negative terminal buckle is not installed in place;

[0129] The reason may include any one of the following: the single-sided fastener is not fastened, the double-sided fastener is not fastened, or the fastener is placed in the reverse direction.

[0130] Herein, the number of the cathode-end fasteners may be 2. The single-sided fastener not being fastened may indicate that only one of the two cathode-end fasteners is not fastened. The double-sided fastener not being fastened may indicate that both of the two cathode-end fasteners are not fastened. The fastener being placed in the reverse direction may indicate that the cathode-end fastener is located at the installation position of the anode-end fastener.

[0131] In this way, it is possible not only to determine whether the cathode fastener is properly installed, but also to determine the reason why the cathode fastener is not properly installed when the cathode fastener is not properly installed.

[0132] In some embodiments of the present application, when the second detection result indicates that the anode-end fastener is not properly installed, the second detection result may further include the reason why the anode-end fastener is not properly installed;

[0133] The reason may include any one of the following: the single-sided fastener is not fastened, the double-sided fastener is not fastened, or the fastener is placed in the reverse direction.

[0134] Herein, the number of the anode-end fasteners may be 2. The single-sided fastener not being fastened may indicate that only one of the two anode-end fasteners is not fastened. The double-sided fastener not being fastened may indicate that both of the two anode-end fasteners are not fastened. The fastener being placed in the reverse direction may indicate that the anode-end fastener is located at the installation position of the cathode-end fastener.

[0135] In this way, it is possible not only to determine whether the anode fastener is properly installed, but also to determine the reason why the anode fastener is not properly installed when the anode fastener is not properly installed.

[0136] In some embodiments of the present application, the first detection result for determining the cathode-end fastener based on the first image may include:

[0137] Using the fastener detection model to perform cathode-end fastener detection based on the first image to obtain the first detection result.

[0138] Specifically, the first image may be input into the fastener detection model, and the fastener detection model may perform cathode-end fastener detection based on the first image and output the first detection result.

[0139] In this way, the cathode-end fastener can be quickly and accurately detected through the AI algorithm.

[0140] In some embodiments of the present application, the second detection result for determining the anode-end fastener based on the second image may include:

[0141] Using the fastener detection model to perform anode-end fastener detection based on the second image to obtain the second detection result.

[0142] Specifically, the second image may be input into a fastener detection model, and the fastener detection model may perform a fastener detection on the anode terminal based on the second image and output a second detection result.

[0143] In this way, the anode terminal fasteners can be quickly and accurately detected through AI algorithms.

[0144] In some embodiments of the present application, the fastener detection model may include a target detection network, a semantic segmentation network, and a result determination network;

[0145] The above-mentioned method of performing cathode end fastener detection based on the first image using the fastener detection model to obtain a first detection result may include:

[0146] Performing target detection on the first image using a target detection network to obtain a first region corresponding to the battery cell component;

[0147] Performing semantic segmentation on the first image based on the first region using a semantic segmentation network to obtain a mask image;

[0148] A result determination network is used to determine a first detection result based on a width of a preset position of a first region in the mask image.

[0149] Here, the first area may be the area where the top cover and the top bracket are located in the first image. The preset position may be the position where the cathode end fastener is located. In the case where there are multiple cathode end fasteners, each cathode end fastener corresponds to a preset position.

[0150] The width of the preset position is different when the cathode terminal fastener is installed in place and when it is not installed in place, so the first detection result can be determined based on the width of the preset position.

[0151] Specifically, when the cathode end fastener is installed in place, the top cover and the top bracket are parallel, and the width of the preset position meets the standard width. When the cathode end fastener is not installed in place, the top bracket is tilted, and the width of the preset position is greater than the standard width.

[0152] Exemplarily, the traditional Halcon algorithm may be used to process the first image.

[0153] In this way, the first area is first determined through target detection, and then the mask image is obtained using the semantic segmentation network. Then, the result is determined based on the width of the preset position, which can quickly and accurately determine the first detection result.

[0154] In some embodiments of the present application, the preset position may include a first position, a second position, and a third position. The first position and the third position may be positions where the cathode end fastener is located, and the second position may be located between the first position and the second position.

[0155] Based on the width of the preset position in the first region of the mask image, the above-mentioned utilization result determination network determines the first detection result, which may include:

[0156] When the widths at the first position, the second position, and the third position are all equal to the first threshold, it is determined that the first detection result indicates that the negative terminal buckle is installed in place;

[0157] When the width at the first position is greater than the first threshold and the width at the third position is equal to the first threshold, or when the width at the first position is equal to the first threshold and the width at the third position is greater than the first threshold, it is determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the unilateral buckle is not buckled;

[0158] When the widths at the first position, the second position, and the third position are all greater than the second threshold, it is determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the bilateral buckle is not buckled;

[0159] When the widths at the first position and the third position are both greater than the first threshold and less than the second threshold, and the width at the second position is greater than the second threshold, it is determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the buckle is placed in the reverse direction.

[0160] Here, when the number of negative terminal buckles is 2, the preset positions may include the first position, the second position, and the third position. The first position and the third position may be the positions where the two negative terminal buckles are located respectively. The second position may be located between the first position and the second position. For example, the second position may be located at the center of the first position and the second position.

[0161] The first threshold may be the standard width of the first position, the second position, and the third position. The second threshold may be greater than the first threshold. Both the first threshold and the second threshold can be set according to actual requirements.

[0162] Specifically, if the widths at the first position, the second position, and the third position are all equal to the first threshold, it can be determined that the first detection result indicates that the negative terminal buckle is installed in place; if the width at the first position is greater than the first threshold and the width at the third position is equal to the first threshold, or if the width at the first position is equal to the first threshold and the width at the third position is greater than the first threshold, it can be determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the unilateral buckle is not buckled; if the widths at the first position, the second position, and the third position are all greater than the second threshold, it can be determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the bilateral buckle is not buckled; if the widths at the first position and the third position are both greater than the first threshold and less than the second threshold, and the width at the second position is greater than the second threshold, it can be determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the buckle is placed in the reverse direction.

[0163] In this way, through the above process, it is possible to accurately determine whether the cathode end buckle is installed in place. If it is not installed in place, it is also possible to accurately determine the reason for the failure to be installed in place, avoiding over-killing or missed killing during the detection of the battery cell assembly.

[0164] The specific process of using the buckle detection model to detect the anode end buckle based on the second image and obtaining the second detection result is the same as the specific process of using the buckle detection model to detect the cathode end buckle based on the first image and obtaining the first detection result, which will not be elaborated here.

[0165] In some embodiments of the present application, the distance between the two cathode end buckles may be different from the distance between the two anode end buckles. Based on this, the preset positions corresponding to the cathode end buckles and the preset positions corresponding to the anode end buckles may be different.

[0166] To better describe the entire solution, based on the above embodiments, a specific example is given, such as Figure 6 As shown, the detection method of the battery cell assembly may include S601 - S610, which will be explained in detail below.

[0167] S601, when the battery cell assembly reaches the detection station, the PLC may send a signal indicating arrival to the host computer.

[0168] S602, the PLC may send the cell code of the battery cell assembly to the host computer.

[0169] S603, when both the first camera and the second camera have completed the previous round of image acquisition, the host computer may send a signal indicating successful reset to the PLC.

[0170] S604, the PLC sends a trigger signal to the host computer.

[0171] S605, the host computer triggers the light source controller to control the brightness of the first light source module and the second light source module.

[0172] S606, the host computer triggers the first camera and the second camera to adjust their own exposure times and acquire images based on the adjusted exposure times.

[0173] S607, the host computer uses an AI algorithm for image processing to obtain the detection result.

[0174] S608, the host computer associates the detection result with the cell code.

[0175] S609, the PLC indexes the detection result according to the cell code of the battery cell assembly.

[0176] S610, the PLC excludes the battery cell assemblies that fail the detection according to the detection results of the battery cell assemblies.

[0177] For the specific processes of S601 - S610, reference can be made to the above - mentioned embodiments, which will not be elaborated here.

[0178] Thus, the negative - terminal buckle is located at the edge part of the first side of the battery cell assembly in the third direction, and the positive - terminal buckle is located at the edge part of the second side of the battery cell assembly in the third direction. The first prism can image the first side of the battery cell assembly in the third direction, and the second prism can image the second side of the battery cell assembly in the third direction. When the battery cell assembly reaches the detection station, the host computer can send image - acquisition signals to the first camera and the second camera. The first camera can acquire the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image, and the second camera can, based on the image - acquisition signal, acquire the image of the second side of the battery cell assembly in the third direction in the second prism to obtain a second image. The host computer can determine whether the negative - terminal buckle is installed in place based on the first image and determine whether the positive - terminal buckle is installed in place based on the second image, thereby realizing the detection of whether the buckle is installed in place.

[0179] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text but includes all technical solutions falling within the scope of the claims.

Claims

1. A soft connection system for a battery cell assembly, characterized in that, The battery cell assembly includes a top cover, a top bracket, and two bare battery cells. The two bare battery cells are spaced apart in a first direction. The top cover and the top bracket are located between the two bare battery cells. The top bracket is disposed on one side of the top cover in a second direction and is fixed to the top cover by a negative terminal clip and a positive terminal clip. The negative terminal clip is located at the edge of the first side of the battery cell assembly in a third direction, and the positive terminal clip is located at the edge of the second side of the battery cell assembly in the third direction. The first direction, the second direction, and the third direction intersect pairwise. The system includes: A host computer, electrically connected to a first camera and a second camera, for sending an image acquisition signal to the first camera and the second camera when the battery cell assembly reaches a detection station; A first prism, for imaging the first side of the battery cell assembly in the third direction; The first camera, for acquiring the image of the first side of the battery cell assembly in the third direction in the first prism based on the image acquisition signal to obtain a first image; A second prism, for imaging the second side of the battery cell assembly in the third direction; The second camera, for acquiring the image of the second side of the battery cell assembly in the third direction in the second prism based on the image acquisition signal to obtain a second image; The host computer is further configured to receive the first image and the second image, determine a first detection result of the negative terminal clip based on the first image, and determine a second detection result of the positive terminal clip based on the second image. The first detection result is used to indicate whether the negative terminal clip is installed in place, and the second detection result is used to indicate whether the positive terminal clip is installed in place.

2. The system according to claim 1, characterized in that, The system further includes: A light source controller, electrically connected to the host computer, a first light source module, and a second light source module respectively; The host computer is configured to send a brightness control signal to the light source controller when the battery cell assembly reaches the detection station; The light source controller is configured to adjust the brightness of the first light source module and the second light source module based on the brightness control signal; The first light source module, for illuminating the edge of the first side of the battery cell assembly in the third direction; The first camera is configured to acquire the image of the first side of the battery cell assembly in the third direction in the first prism when the first side of the battery cell assembly in the third direction is illuminated by the first light source module to obtain a first image; The second light source module, for illuminating the edge of the second side of the battery cell assembly in the third direction; The second camera is configured to acquire the image of the second side of the battery cell assembly in the third direction in the second prism when the second side of the battery cell assembly in the third direction is illuminated by the second light source module to obtain a second image.

3. The system according to claim 2, wherein The system further includes: The first diffuser is located between the light-emitting side of the first light source module and the first side of the battery cell assembly in the third direction, and is configured to diffusely reflect the first light emitted by the first light source module to form second light; The first camera is configured to collect an image of the first side of the battery cell assembly in the third direction in the first prism when the first side of the battery cell assembly in the third direction is irradiated by the second light, so as to obtain a first image; The second diffuser is located between the light-emitting side of the second light source module and the second side of the battery cell assembly in the third direction, and is configured to diffusely reflect the third light emitted by the second light source module to form fourth light; The second camera is configured to collect an image of the second side of the battery cell assembly in the third direction in the second prism when the second side of the battery cell assembly in the third direction is irradiated by the fourth light, so as to obtain a second image.

4. The system according to claim 1, wherein The first prism includes a first reflective area, and the first reflective area is configured to reflect the fifth light reflected by the first side of the battery cell assembly in the third direction to the first camera; The second prism includes a second reflective area, and the second reflective area is configured to reflect the sixth light reflected by the second side of the battery cell assembly in the third direction to the second camera.

5. The system according to claim 3, wherein The first light emitted by the first light source module is diffusely reflected by the first diffuser to form the second light, and the second light is projected onto the first side of the battery cell assembly in the third direction; The first camera is configured to collect the position where the first side of the battery cell assembly in the third direction is irradiated by the second light, so as to obtain the first image; The third light emitted by the second light source module is diffusely reflected by the second diffuser to form the fourth light, and the fourth light is projected onto the second side of the battery cell assembly in the third direction; The second camera is configured to collect the position where the second side of the battery cell assembly in the third direction is irradiated by the fourth light, so as to obtain the second image.

6. The system according to any one of claims 1-5, characterized in that, The system further includes: A lower computer, electrically connected to the upper computer, and configured to send a trigger signal to the upper computer when the battery cell assembly reaches the detection station and both the first camera and the second camera are ready; The upper computer is configured to send an image acquisition signal to the first camera and the second camera in response to the trigger signal.

7. The system according to any one of claims 1-5, characterized in that, The upper computer is further configured to send an exposure time control signal to the first camera and the second camera; The first camera is further configured to adjust its own exposure time based on the exposure time control signal, and collect the first image based on the adjusted exposure time; The second camera is further configured to adjust its own exposure time based on the exposure time control signal, and collect the second image based on the adjusted exposure time.

8. The system according to claim 6, wherein The lower computer is further configured to send an identifier of the battery cell assembly to the upper computer; The upper computer is further configured to associate the detection result with the identifier of the battery cell assembly, and the detection result includes the first detection result and the second detection result; The lower computer is further configured to search for the detection result based on the identifier of the battery cell assembly.

9. A detection method for a battery cell assembly, characterized in that, The battery cell assembly includes a top cover, a top bracket, and two bare battery cells. The two bare battery cells are spaced apart in a first direction. The top cover and the top bracket are located between the two bare battery cells. The top bracket is disposed on one side of the top cover in a second direction and is fixed to the top cover by a negative terminal buckle and a positive terminal buckle. The negative terminal buckle is located at the edge of the first side of the battery cell assembly in a third direction, and the positive terminal buckle is located at the edge of the second side of the battery cell assembly in the third direction. The first direction, the second direction, and the third direction intersect pairwise and include: When the battery cell assembly reaches the detection station, the host computer sends an image acquisition signal to the first camera and the second camera; Using a first prism to image the first side of the battery cell assembly in the third direction; Based on the image acquisition signal, the first camera acquires the image of the first side of the battery cell assembly in the third direction in the first prism to obtain a first image; Using a second prism to image the second side of the battery cell assembly in the third direction; Based on the image acquisition signal, the second camera acquires the image of the second side of the battery cell assembly in the third direction in the second prism to obtain a second image; The host computer receives the first image and the second image, determines a first detection result of the negative terminal buckle based on the first image, and determines a second detection result of the positive terminal buckle based on the second image. The first detection result is used to indicate whether the negative terminal buckle is installed in place, and the second detection result is used to indicate whether the positive terminal buckle is installed in place.

10. The method according to claim 9, characterized in that, When the first detection result indicates that the negative terminal buckle is not installed in place, the first detection result further includes the reason why the negative terminal buckle is not installed in place; The reason includes any one of unfastened single-sided buckle, unfastened double-sided buckle, and reversed buckle.

11. The method according to any one of claims 9-10, characterized in that, The determining the first detection result of the negative terminal buckle based on the first image includes: Using a buckle detection model to perform negative terminal buckle detection based on the first image to obtain the first detection result.

12. The method according to claim 11, wherein The buckle detection model includes an object detection network, a semantic segmentation network, and a result determination network; The using the buckle detection model to perform negative terminal buckle detection based on the first image to obtain the first detection result includes: Using the object detection network to perform object detection on the first image to obtain a first region corresponding to the battery cell assembly; Using the semantic segmentation network to perform semantic segmentation on the first image based on the first region to obtain a mask image; Using the result determination network to determine the first detection result based on the width of a preset position of the first region in the mask image.

13. The method according to claim 12, characterized in that, The preset positions include a first position, a second position, and a third position. The first position and the third position are the positions where the negative terminal buckle is located, and the second position is located between the first position and the second position; The determining the first detection result by using the result determination network based on the width of the preset position of the first region in the mask image includes: When the widths of the first position, the second position, and the third position are all equal to a first threshold, it is determined that the first detection result indicates that the negative terminal buckle is installed in place; When the width of the first position is greater than the first threshold and the width of the third position is equal to the first threshold, or when the width of the first position is equal to the first threshold and the width of the third position is greater than the first threshold, it is determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the unilateral buckle is not buckled; When the widths of the first position, the second position, and the third position are all greater than a second threshold, it is determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the bilateral buckle is not buckled, and the second threshold is greater than the first threshold; When the widths of the first position and the third position are both greater than the first threshold and less than the second threshold, and the width of the second position is greater than the second threshold, it is determined that the first detection result indicates that the negative terminal buckle is not installed in place, and the reason is that the buckle is placed in the reverse direction.

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